An apparatus for arranging elongated elements to be used in a process for building tyres for vehicle wheels includes a first winding support, a second winding support, and a coupling device. The first winding support is configured to receive a winding of a first elongated element of a first type and the second winding support is configured to receive a winding of a second elongated element of a second type different from the elongated element of the first type. The coupling device includes a first coupling body and a second coupling body rotatable with respect to one another about a rotation axis, said coupling device further comprising an inner hub extending coaxially to the rotation axis, and said first coupling body and said second coupling body are rotatably coupled with said inner hub.
A plant for building tyres for vehicle wheels includes a winding station, a configuring device, an unwinding station, and a building line. The winding station is configured to wind elongated elements of a first type on winding supports mounted on a first coupling device, and elongated elements of a second type on winding supports mounted on a second coupling device. The configuring device is configured to transfer winding supports onto coupling devices. The unwinding station is configured to simultaneously unwind elongated elements from winding supports. The building line includes at least one forming drum operatively associated with the unwinding station to simultaneously receive elongated elements from the unwinding station.
A plant for building tyres for vehicle wheels includes: a first winding station configured to simultaneously wind a first elongated element and a second elongated element of a first type, respectively on a first winding support and on a second winding support in respective first axial positions; an unwinding station configured to simultaneously unwind an elongated element of the first type and an elongated element of the second type from said first winding support or from said second winding support; and a building line comprising at least one forming drum operatively associated with the unwinding station to simultaneously receive an elongated element of the first type and an elongated element of the second type from said first winding support or from said second winding support.
A compound is described represented by the formula (II):
A compound is described represented by the formula (II):
WF-O-ROS-GC-Fe (II)
A compound is described represented by the formula (II):
WF-O-ROS-GC-Fe (II)
wherein WF represents a white filler, O represents one or more oxygen bridge bonds, ROS represents an organo-silane residue, GC represents one or more coordinating groups forming a chelate with iron in ionic form, and Fe represents iron in ionic form (Fe3+) coordinated with the coordinating groups. A process is further described for the preparation of the compound of formula (II), and its use in the vulcanisation process of elastomeric compounds.
A winter car tyre (100) is described, in particular a winter car tyre able to deliver high driving torque and/or to reach high speeds, provided with a tread band comprising transverse sipes (13), wide and deep pairs of first transverse grooves (2, 3) which are widely extended and alternate with pairs of second transverse grooves (4, 5) which are of non-negligible extent but are smaller wide and deep and are counter-inclined relative to the first transverse grooves (2, 3).
The present invention relates to a novel adduct between lignin and a pyrrole derivative of formula (I) wherein R1-R4 and W have the meaning as defined in the description, to be used as reinforcing filler for vulcanisable elastomeric compositions suitable for the production of tire for vehicle wheels.
The present invention relates to a novel adduct between lignin and a pyrrole derivative of formula (I) wherein R1-R4 and W have the meaning as defined in the description, to be used as reinforcing filler for vulcanisable elastomeric compositions suitable for the production of tire for vehicle wheels.
The present invention relates to an improved process for the preparation of an elastomer composition comprising a linear or cyclic di-carboxylic acid, or a derivative thereof.
C07D 309/36 - Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with oxygen atoms directly attached to ring carbon atoms
The present invention relates to a tyre for vehicle wheels which comprises at least one structural element comprising a vulcanised elastomeric compound obtained by vulcanisation of a vulcanisable elastomeric composition comprising per 100 phr of diene elastomeric polymer: (i) a predispersion of a diene elastomeric polymer and lignin, in an amount to provide the elastomeric composition with 100 to 10 phr of diene elastomeric polymer an amount of lignin equal to or greater than 5 phr, (ii) 0 to 90 phr of at least one diene elastomeric polymer, (iii) 5 to 50 phr of a reinforcing filler, (iv) from 0.1 to 12 phr of at least one vulcanising agent, wherein said lignin is lignin functionalised with an acyl group represented by the following formulas (1) and (2): where R1, R2, R3 and R4 are as defined in the description.
The present invention relates to a tyre for vehicle wheels which comprises at least one structural element comprising a vulcanised elastomeric compound obtained by vulcanisation of a vulcanisable elastomeric composition comprising per 100 phr of diene elastomeric polymer: (i) a predispersion of a diene elastomeric polymer and lignin, in an amount to provide the elastomeric composition with 100 to 10 phr of diene elastomeric polymer an amount of lignin equal to or greater than 5 phr, (ii) 0 to 90 phr of at least one diene elastomeric polymer, (iii) 5 to 50 phr of a reinforcing filler, (iv) from 0.1 to 12 phr of at least one vulcanising agent, wherein said lignin is lignin functionalised with an acyl group represented by the following formulas (1) and (2): where R1, R2, R3 and R4 are as defined in the description.
A beltless tyre for motor vehicles has a carcass structure with two carcass plies, each with parallel cords crossed together. A reinforcing cord is wound in circumferential turns arranged in radially outer position with respect to the carcass structure. The reinforcing cord has a percentage elongation and is configured to exhibit a tensile load-elongation relationship according to a curve. The curve has a first region for elongation values less than the percentage elongation and a second region for elongation values greater than the percentage elongation. A ratio of the slope of the first region to the slope of the second region is greater than 1.
B60C 9/06 - Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend diagonally from bead to bead and run in opposite directions in each successive carcass ply, i.e. bias angle ply
B60C 9/00 - Reinforcements or ply arrangement of pneumatic tyres
B60C 9/04 - Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
16.
METHOD FOR RESTORING A MONITORING FUNCTIONALITY IN A TYRE AND RELATIVE TYRE
Method of restoring a monitoring functionality in a tyre (99) and tyre (99) suitable for such method for restoring, the method comprising producing the vulcanized tyre (99) comprising at least a first (A1) and a second clean portions (A2) of an inner surface (1) of the tyre (99), fixing a first monitoring device (3) on the first clean portion (A1) and leaving the second clean portion (A2) free of monitoring devices; and, following a loss of monitoring functionality by the first monitoring device (3) fixed onto the first clean portion (A1) , fixing a second monitoring device (4) onto the second clean portion (A2).
A front tyre (1) for motorcycle wheels is described comprising an equatorial plane (X-X), and a tread band (8) having an overall axial extension (L) and comprising a radially inner portion (12) made with a first vulcanized elastomeric material and a radially outer portion (11) comprising: a1) a central annular portion (L1) arranged astride the equatorial plane (X-X) of the tyre (1) and made with the first vulcanized elastomeric material, and a2) a pair of lateral annular portions (L2, L3) arranged at opposite sides of the central annular portion (L1) with respect to the equatorial plane (X-X) of the tyre (1) and made with a second vulcanized elastomeric material. In the tyre (1), a ratio RI between the dynamic elastic modulus E′ of the second vulcanized elastomeric material, measured at a frequency of 10 Hz and at 23° C., and the dynamic elastic modulus E′ of the first vulcanized elastomeric material, measured at a frequency of 10 Hz and at 23° C., is comprised between 0.6 and 1.2. In the tyre (1), a ratio R2 between the tandelta of the second vulcanized elastomeric material, measured at a frequency of 10 Hz and at 70° C., and the tandelta of the first vulcanized elastomeric material, measured at a frequency of 10 Hz and at 23° C., is comprised between 0.6 and 1.2.
Method for checking tyres, comprising: providing an initial image (100) representative of a finished tyre, said initial image (100) comprising first pixels (11), representative of plain or decorated first background areas (21), and second pixels (12), representative of second areas (22) containing writings and/or logos; applying a segmentation algorithm to said initial image (100), thereby obtaining a corresponding segmented image, wherein said segmentation algorithm is based on a first neural network. The first neural network is trained to: associate said first pixels (11) of said initial image (100) with a first category; associate said second pixels (12) of said initial image (100) with a second category; associate pixels other than said first pixels (11) and said second pixels (12) with said first category. The method further comprises: selecting, starting from said segmented image, the pixels belonging to said first category, thereby obtaining a processed image; applying an inpainting algorithm to said processed image, thereby obtaining a resulting image. In said resulting image, those parts corresponding to the pixels not belonging to the first category are filled as a function of the pixels belonging to the first category and adjacent to said parts corresponding to the pixels not belonging to the first category. The method further comprises applying a first anomaly detection algorithm to said resulting image, said first anomaly detection algorithm being based on a second neural network trained to recognize any anomalies with reference to images representative of said first areas (22) with substantially no defects; generating a first notification signal if said first anomaly detection algorithm identifies an anomaly in said resulting image.
Method for checking tyres, comprising: providing a plurality of first mould drawings (10) for moulding corresponding first tyres; providing a plurality of acquired images (20) of said corresponding first tyres; providing a generative artificial intelligence system (GenAI); executing an operation of training said generative artificial intelligence system (GenAI), wherein said first mould drawings (10) and said acquired images (20) are inputted to said generative artificial intelligence system (GenAI); after said training operation, inputting to said generative artificial intelligence system (GenAI) a plurality of second mould drawings (60) of corresponding second tyres; obtaining from said generative artificial intelligence system (GenAI), as output, a plurality of resulting images (70), generated on the basis of said second mould drawings (60); training an anomaly detection neural network (NN) on the basis of said resulting images (70); moulding and curing a finished tyre (FT), and preparing said finished tyre (FT) for checking; taking one or more images of said finished tyre (FT), thereby obtaining one or more corresponding taken images (50); checking said finished tyre (FT) by Inputting said one or more taken images (50) to said anomaly detection neural network (NN); generating a notification signal (NS) through said anomaly detection neural network (NN) when one or more anomalies are detected.
The present invention relates to a soundproof tyre for vehicle wheels comprising at least one noise-reducing element made by vulcanisation of a cross-linkable and expandable elastomeric compound comprising at least one diene elastomeric polymer, at least one expanding agent, at least one cross-linking resin, at least one polymer or copolymer of a hydroxy acid and optionally, an agent selected from the group of fatty acid amides.
B60C 19/00 - Tyre parts or constructions not otherwise provided for
B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
C08J 9/00 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof
C08J 9/10 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen
Method for checking tyres, comprising: providing a plurality of first mould drawings (10) for moulding corresponding first tyres; providing a plurality of acquired images (20) of said corresponding first tyres; providing a generative artificial intelligence system (GenAI); executing an operation of training said generative artificial intelligence system (GenAI), wherein said first mould drawings (10) and said acquired images (20) are inputted to said generative artificial intelligence system (GenAI); after said training operation, inputting to said generative artificial intelligence system (GenAI) a further mould drawing (30) for manufacturing a further tyre different from said corresponding first tyres, so that said generative artificial intelligence system (GenAI) will output at least one generated image (40) of said further tyre; moulding and curing a tyre by using said mould having the drawing of said further tyre, thereby obtaining a finished tyre (FT), and preparing said finished tyre (FT) for checking; taking one or more images of said finished tyre (FT), thereby obtaining one or more corresponding taken images (50); making a comparison between said one or more taken images (50) and said at least one generated image (40), in order to identify one or more defects of said finished tyre (FT); generating a notification signal (NS) on the basis of said comparison.
B29D 30/00 - Producing pneumatic or solid tyres or parts thereof
G05B 19/418 - Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
k tyre comprises a tread band (2), in which there is defined a pair of axially opposite shoulder regions (4, 5) and a central region (6) which is interposed between said shoulder regions (4, 5), and wherein there is defined on at least a first shoulder region (4) of said pair a plurality of transverse grooves (7) and a plurality of blocks (50, 51, 52) which are delimited by at least a pair of said plurality of transverse grooves (7). Said plurality of blocks comprises at least one first block (51) and at least one second block (52), which are arranged in succession along the circumferential development of said first shoulder region (4), wherein on said at least one first block (51) there is defined a first main sipe (20) which extends along a first longitudinal development direction (A). Said first main sipe (20) comprises first lateral walls (21, 22) which extend from a radially inner surface of said tread band towards a radially outer surface (3) of said tread band and a first section (20a) which extends along said first longitudinal development direction (A) between a first axially inner end (23) and a first intermediate portion (24) of said first main sipe (20), wherein said first lateral walls (21, 22) have respective first upper edges (210, 220) which meet the radially outer surface (3) of the tread band along respective first contact lines (31, 32), parallel to each other and arranged at a first distance DI. Said first main sipe (20) comprises a second section (20b) which extends along said first longitudinal development direction (A) from said first intermediate portion (24) towards said first axially external end (25), wherein said first contact lines (31, 32) diverge, until being arranged at a maximum distance D2, one from the other. On said at least one second block (52) there is defined a second main sipe (40) which extends along a respective second longitudinal development direction (B). Said second main sipe (40) comprises second lateral walls (41, 22) which extend from a radially inner surface of said tread band towards a radially outer surface (3) of said tread band and a first section (40a) which extends along said second longitudinal development direction (B) between a second axially inner end (43) and a second intermediate portion (44) of said second main sipe (40), wherein said second lateral walls (41, 42) have respective second upper edges (410, 420) which meet the radially outer surface (3) of the tread band along respective second contact lines (33, 34), arranged at a third maximum distance D3, and which converge towards said second intermediate portion (44), at which they are arranged at a fourth distance D4. Said second main sipe (40) further comprises a second section (40b) which extends along said second longitudinal development direction (B), between said second intermediate portion (44) and a second axially external end (45) of said second main sipe, wherein said second contact lines (33, 34) are parallel to each other and arranged at said fourth distance D4.
A tyre (1) for vehicle wheels comprises a carcass structure (2) which is toroidally shaped around a rotation axis of the tyre (1), and a tread band (7), arranged in a radially external position with respect to the carcass structure (2) and intended for contact with a road surface. The carcass structure (2) comprises a band (10) made of expanded elastomer material and which comprises a main surface (11) on which a plurality of surface discontinuity elements (12, 13), which are distributed in a regular configuration, is defined and wherein the distance between each point on the main surface (11) and at least one surface discontinuity element (12, 13) is less than 50 mm.
The present invention relates to cross-linkable elastomer compositions comprising modified cellulose, a process for the preparation of the corresponding elastomer compound, tyre components comprising said elastomer compound and tyres comprising said tyre components. In particular, the present invention relates to the use of cellulose functionalized by lipase catalysed esterification with 1,2-dithiolane derivative acids, in particular lipoic acid and derivatives thereof, as reinforcing filler in cross-linkable elastomer compositions, in particular for tyre applications.
PROCESS FOR BUILDING A TYRE FOR VEHICLE WHEELS, TYRE OBTAINABLE WITH SAID PROCESS, AND CONTINUOUS ELONGATED ELEMENT FOR MANUFACTURING A TREAD BAND FOR VEHICLE TYRES
During the building of a tyre (1), the tread band (8) is attained by a continuous elongated element (10) comprising a first elongated element (16) and a second elongated element (17), respectively made with a first elastomeric material and a second elastomeric material that are different from each other, mutually joined along a coupling interface (18) which is extended diagonally through the thickness (Th) of the continuous elongated element (10), from a first end edge (14) comprising a first terminal point (19) of the coupling interface (18) spaced from both lateral surfaces (13). The continuous elongated element (10) is wound according to circumferential turns (C) that are at least partially consecutively approached, in order to form at least one layer (8b) of the tread band (8).
B29D 30/52 - Unvulcanised treads, e.g. on used tyresRetreading
B29C 48/21 - Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
B29C 48/49 - Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
B29D 30/60 - Applying bands of rubber treads, i.e. applying camel backs by winding narrow strips
A process for manufacturing tyres, comprising: depositing a first layer (21) made of elastomeric material on an outer surface of a building support (11); pre-vulcanising said first layer (21); depositing a plurality of tyre components around said first layer (21) carried by the building support (11), in order to form a green tyre (2); vulcanising the green tyre (2), in order to obtain a moulded and vulcanised tyre (2); wherein pre-vulcanising said first layer (21) comprises heating said first layer (21) carried by the building support (11), by an electromagnetic radiation irradiated from the exterior of the building support (11) towards an outer surface of said first layer (21).
In a process and plant for building tyres for vehicle wheels, it is provided that a plurality of forming supports (500) is sorted in a plurality of building stations (W1-W17) arranged one after the other along a predefined path (P1-P3). The sorting of the forming supports (500) takes place according to a predefined building logic suitable for carrying out in said building stations (W1-W17) a predefined sequence of deposition operations on the forming supports aimed at building a respective tyre on a respective forming support (500). In particular, it is provided for: positioning each forming support (500) in any storage area (50) free of forming supports (500) of any building station (W1-W17), picking up said forming support (500) from the respective storage area (50) to carry out thereon the deposition operation planned at the building station (W1- W17) selected on the basis of said predefined building logic and, subsequently, positioning the forming support (500) in any storage area (50) free of forming supports (500) of the building station (W1-W17), the latter storage area (50) acting as an outlet storage area (50') from said building station (W1-W17). For each forming support (500) and for at least some deposition operations of said predefined sequence of deposition operations, it is provided for repeating the aforesaid actions until a respective tyre has been built on each forming support (500).
Method and system (1) for monitoring a status of a tyre (3) mounted on a wheel (7) of a vehicle (99), where said system (1) comprises an acquisition system (2) structured to acquire a signal (S) representative of a motion of a crown portion (31) of said tyre (3) and a processing unit (8) in communication with said acquisition system (2) and programmed to receive from said acquisition system (2) said signal (S) and to perform the following steps of said method: dividing said signal (S) into a set of signal portions (SP); for each signal portion (SP), calculating a respective value of a parameter (KPI) representative of an average power of said signal of said signal portion (SP); comparing each respective value of said parameter (KPI) with a threshold value (TV); removing from said set each signal portion (SP) corresponding to a respective value of said parameter (KPI) greater than said threshold value (TV) to obtain an elaborated signal (SE); and monitoring a status of said tyre (3) as a function of said elaborated signal (SE).
Method and system (1) for determining a respective geographical position (GP) of defects (RD) of a road surface (900), the system (1) comprising a first acquisition system (2) structured to acquire over time a signal (S) representative of a motion of a crown portion (30) of a tyre (3) of a vehicle (99), a second acquisition system (20) structured to acquire information representative of a plurality of geographical positions (Loc) of the vehicle (99) along a path, and a processing unit (8) programmed to receive the signal (S) and the information representative of the plurality of geographical positions (Loc) and to perform the following steps of the method: dividing the signal (S) into a set of signal portions (SP); for each signal portion (SP), calculating a respective value of a parameter (KPI) representative of an average power of the signal; comparing each respective value of the parameter (KPI) with a threshold value (TS); selecting each signal portion (SP) corresponding to a respective value of the parameter (KPI) greater than the threshold value (TS), to obtain a set of candidate signal portions (SP'); correlating each candidate signal portion (SP') to at least one respective geographical position (Loc) and determining a respective geographical position (GP) of a respective defect (RD) for each candidate signal portion (SP') as the at least one respective geographical position (Loc) correlated to the candidate signal portion (SP').
Method and system (1) for operating a detection device (4) fixed on an inner surface (5) of a tyre (3) in a current time cycle having a duration not exceeding a rotation period of said tyre (3), said system (1) comprising said detection device (4) and a processing unit (8), operatively connected to said detection device (4), and programmed to: start, and subsequently stop, an acquisition of a signal (S) representative of a motion of a portion (30) of said tyre (3) in an acquisition time window (TA), transmit said signal (S) and/or at least one processed data obtained as a function of said signal (S) in a transmission time window (TT), and determine said acquisition time window (TA) as a function of at least one of a first parameter (w) representative of an angular velocity of said tyre (3) and a second parameter (T) representative of said rotation period, with said transmission time window (TT) temporally disjoint from said acquisition time window (TA).
1nn) of the semifinished product (13) positioned on the support surface (20) while the support surface (20) and the semifinished product (13) are stationary, so as to determine a positioning of the semifinished product (13) with respect to the support surface (20); arranging one end of the support surface (20) close to a surface (14) radially external to the building drum (15); winding the semifinished product (13) on the radially external surface (14) by advancing the support surface (20) towards the building drum (15) and by rotating the building drum (15) around a main axis (X-X) thereof. During the winding, provision is made for causing a relative movement between the building drum (15) and the support surface (20) along a direction (48) parallel to the main axis (X-X) as a function of the positioning of the semifinished product (13) with respect to the support surface (20), so as to adjust a positioning of the semifinished product (13) on the radially external surface (14).
0000 + 5/2π; starting, and subsequently stopping, acquisition of the signal (S) in an acquisition time window (TA) defined by the initial acquisition time instant (Ti) and the final acquisition time instant (Tf).
A mould (1; 100) for vulcanising tyres for vehicle wheels, comprising:
at least one sidewall plate (3) on which a moulding surface (4) is defined,
a removable insert (10) arranged to be received in a seat (5) which is made in said sidewall plate and open on said moulding surface, said insert comprising a main body (11; 111) on which a base surface (12) is defined which is intended for contacting a portion of a sidewall (52) of the green tyre, and
a retaining member (20) for retaining said insert (10) inside said seat (5).
A mould (1; 100) for vulcanising tyres for vehicle wheels, comprising:
at least one sidewall plate (3) on which a moulding surface (4) is defined,
a removable insert (10) arranged to be received in a seat (5) which is made in said sidewall plate and open on said moulding surface, said insert comprising a main body (11; 111) on which a base surface (12) is defined which is intended for contacting a portion of a sidewall (52) of the green tyre, and
a retaining member (20) for retaining said insert (10) inside said seat (5).
The retaining member (20) comprises at least one locking element which is mounted on one out of said insert (10) and said sidewall plate (3) and can be moved in an operating direction (Y), which is incident with respect to an insertion direction (X) of said insert into said seat, between a locking position, in which said insert is retained inside said seat, and a release position, in which said insert is free to leave said seat (21; 121).
Method, and corresponding detection system, for detecting the position of one or more sensors (20) associated with respective wheels of a vehicle (25) on which one or more receivers (21 ) are installed, comprising, for each sensor-receiver couple: - by the respective sensor (20), wirelessly transmitting a respective time sequence of packets comprising a respective identification code of the sensor; - by the respective receiver (21 ), receiving at least a respective sub-group of packets of the respective time sequence; - calculating, as a function of the respective sub-group of received packets, a respective current value of one or more quality parameters, each quality parameter being representative of the reception quality associated with the sensor-receiver couple; wherein the method comprises, for each quality parameter and for each pair of sensor- receiver couples that shares a respective sensor or alternatively a respective receiver: - determining a current order among the current values associated with the sensor- receiver couples of the pair of couples; - calculating a respective error probability that real values of the quality parameter associated with the sensor-receiver couples of the pair of couples are in a real order inverse to the current order; wherein the method comprises, for each pair of sensor-receiver couples, on the basis of said comparison, determining a final order of sensor-receiver distance among the sensor- receiver couples of the pair of couples as a function of the current order among the current values of at least one quality parameter, and determining the position of each sensor (20) as a function of the final order of sensor- receiver distance and as a function of the position of each antenna (23) of each receiver (21).
A tyre (100) for high performance or ultra high performance cars is described, which is particularly suitable for use on track. The tyre (100) has a tread band (1) extending across an equatorial plane (X-X) of the tyre and having a void-to-rubber ratio equal to or smaller than 0.06; said tread band (1) comprises a circumferential groove (2) and a plurality of longitudinal grooves (4) repeated along the circumferential development of the tyre; said longitudinal grooves (4) are oppositely located to said circumferential groove (2) relative to the equatorial plane (X-X); said longitudinal grooves (4) have a plan surface area, measured on the radially outer surface of the tyre, greater than or equal to 350 mm2.
A tyre (100) for high performance or ultra high performance cars and racing cars is described, which is particularly suitable for use on track. The tyre (100) has a tread band (1) extending across an equatorial plane of the tyre (X-X) and having a void-to-rubber ratio equal to or smaller than 0.06; said tread band (1) comprises a pair (M) of longitudinal grooves (4) repeated along the circumferential development of the tyre, the longitudinal grooves (4) of each pair being located oppositely relative to the equatorial plane (X-X); said longitudinal grooves (4) of each pair having substantially the same shape and dimensions; said longitudinal grooves (4) having a plan surface area, measured on the radially outer surface of the tyre, greater than or equal to 350 mm2.
A method, and a corresponding system, for identifying a tyre having an identification code uniquely associated therewith is provided. The method comprises: receiving (725), at a receiver device (610; 815), a radio beacon signal (520) transmitted by a radio beacon tag (115; 115a - 115d) applied radially internally to the tyre (105; 805a - 805d); extracting from the received radio beacon signal (520) an identification code (525) of the radio beacon tag univocally associated therewith; accessing (730) a database (630) in which an association between the identification code of the radio beacon tag and a tyre identification code (605) univocally associated with the tyre is stored; identifying in the database the identification code of the radio beacon tag extracted from the received radio beacon signal, and obtaining (735) from the database the tyre identification code, which, in the database, is stored associated with the identification code of the identified radio beacon tag. Also provided is a tyre comprising a radio beacon tag (115; 115a - 115d), applied radially internally to the tyre, configured to transmit a radio beacon signal (520) comprising a radio beacon tag identification code (525) univocally associated with the radio beacon tag.
A tyre (1) comprising a tread band (2) comprising: - a plurality of grooves (4A), - a plurality of blocks (5A, 5B, 5C) delimited at least by a first pair of said plurality of grooves (4A), and - a plurality of sipes (10) extending, on said plurality of blocks (5A, 5B, 5C), from a radially outer surface of said tread band (2) to a radially inner surface of the tread band (2). Each sipe (10) extends along a predetermined trajectory and comprises: - an upper portion (101) located at said radially outer surface of said tread band (2) and having, along said predetermined trajectory, a substantially sinusoidal wave pattern having a first amplitude (A') and a first period (P'); and - a lower portion (102) located at said radially inner surface of said tread band (2) and having, along said predetermined trajectory, a respective substantially sinusoidal wave pattern having a second amplitude (A") and a second period (P").
A method and an apparatus (1 ) for handling tyres. The method comprises: arranging a tyre (200) to be handled having a respective rotation axis (Y-Y); retaining the tyre (200) on a radially outer surface (210) thereof through a contact surface (18; 18a, 18b) which is extended with continuity along an arc of circumference coaxial with the rotation axis (X-X); moving the contact surface (18; 18a, 18b) in order to drive the tyre (200) in rotation around the above-mentioned rotation axis (Y-Y). The contact surface (18; 18a, 18b) is carried by a grip element (3) of the apparatus (1 ).
A method, and a corresponding system, of identifying a tyre is provided. The method comprises: providing a radio beacon tag (115; 115a - 115d) configured to transmit a radio beacon signal (520) containing a radio beacon tag identification code (525) univocally associated with the radio beacon tag (115; 115a - 115d); providing a tyre (105); providing a tyre identification code (605) univocally associated with the tyre (105); applying (705) the radio beacon tag (115; 115a - 115d) radially internally to the tyre (105); receiving (710), at a receiver device (610), the radio beacon signal (520) transmitted by the radio beacon tag (115; 115a - 115d) and extracting the radio beacon tag identification code (525) contained in the received radio beacon signal (520); acquiring (715) the tyre identification code (605) of the tyre (105) to which the radio beacon tag (115; 115a - 115d) is applied; pairing the acquired tyre identification code (605) to the radio beacon tag identification code (525) extracted from the received radio beacon signal (520), and storing (720), in a database (630), an association (640) between the radio beacon tag identification code (525) and the tyre identification code (605) associated with it.
After a support structure (12) has been circumferentially positioned around an annular component (11) of a tyre (2), gripping elements (16) carried by the support structure (12) and circumferentially distributed around a central axis (X) are radially approached to the annular component (11) bringing into contact therewith a plurality of feeler pins (22), slidably carried by each of said gripping elements (16). Once contact is made, the radially approaching of the gripping elements (16) to the annular component (11) continues by sliding the gripping elements themselves along the feeler pins (22). All the feeler pins (22) can therefore come into contact with the annular component (11), copying the shape of the outer surface. The feeler pins (22) are then locked with respect to the gripping elements (16) in order to allow the removal of a support drum (10) from the annular component (11) and support the latter in the absence of normal stresses.
A tyre (1) is built on a toroidal support (8) and subsequently closed in a moulding cavity (14) defining a moulding surface (14a) directed towards the tyre (1). The tyre (1) is expanded from a building condition wherein it has an internal surface (1a) adherent against the toroidal support (8) to a pressing condition, wherein the tyre (1) is vulcanised with an external surface (1b) thereof pressed against the moulding surface (14a) due to an expansion imparted to the tyre (1). In the pressing condition, the expansion imparted in the shoulder zones (Sz) of the tyre is smaller than the expansion imparted in each of the sidewall zones (Fz) and crown zone (Cz).
This invention relates to: a cross-linkable elastomeric composition comprising an unsaturated heterocyclic compound; a process for preparing an elastomeric compound; a tire component comprising the aforementioned elastomeric compound; and a tire for vehicle wheels comprising at least the aforementioned tire component.
An “all season” tyre (1) for cars and/or light transport vehicles is described, having a tread band (8) provided with a plurality of longitudinal channels and a plurality of grooves (6, 7, 11,12, 13) and sipes (21, 22, 23, 24, 25) having a substantially transverse course, regularly arranged in the central ribs formed by the longitudinal channels and in the shoulder regions (L2, L3) over the whole tread band (8). The tread band (8) also has transverse notches resulting from joining a groove and a sipe having a transverse course, arranged consecutively to each other, and seamlessly extending substantially over the whole portion of the tyre containing them, i.e., the shoulder regions (L 2, L 3) or some of the central ribs (9, 10).
A method and system for checking a process for building a tyre including sequential deposition of an ordered plurality of N semi-finished elements on a drum. The method includes: establishing an ordered plurality of N classes of drum states, wherein a first class corresponds to a bare drum state and an i-th class corresponds to a drum state including the i-1th semi-finished element deposited in radially outermost position; before the deposition of the i-th semi-finished element: processing an acquired image of a drum state to associate to the current drum state a current class among the ordered plurality of N classes of drum states; authorising the deposition of the i-th semi-finished element based on a comparison between the current class and the expected class.
The present invention relates to tyre elastomeric compositions and compounds, to tyres for vehicle wheels comprising them which are particularly performant and advantageous for summer use. The tyres of the invention, comprising such compounds especially in the tread band, are characterized by reduced wear and rolling resistance and high grip, both under wet and dry conditions. These advantageous features are obtained by combining certain conjugated diene polymers with a plasticizing admixture with a predetermined content of resins and oils.
C08L 53/02 - Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bondsCompositions of derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
A tyre (100) for racing bicycle wheels comprises a carcass structure (2) and a tread band (6) arranged in a radially outer position with respect to the carcass structure (2); wherein the carcass structure (2) comprises a single carcass ply (3) turned around annular anchoring structures (4a, 4b) and wherein free edges (11) of the carcass ply (3) are radially juxtaposed over one another. A protective layer (16) has a width equal to or less than 50% of the width of the tyre (100). A first sidewall reinforcing ply (14) and a second sidewall reinforcing ply (15) are axially arranged between a respective annular anchoring structure (4a, 4b) and an equatorial plane (X) of the tyre. In a first area of juxtaposition (17), the protective layer (16), the first sidewall reinforcing ply (14) and the portion of juxtaposition (12) of edges of carcass ply are radially juxtaposed according to a predetermined order. In a second area of juxtaposition (18), the protective layer (16), the second sidewall reinforcing ply (15) and the portion of juxtaposition (12) of edges of carcass ply are radially juxtaposed according to a predetermined order. The first area of juxtaposition (17) and the second area of juxtaposition (18) are arranged at respective distances from the equatorial plane (X) comprised between 3% and 24% of the width of the tyre (100).
B60C 9/09 - Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend transversely from bead to bead, i.e. radial ply combined with other carcass plies having cords extending diagonally from bead to bead, i.e. combined radial ply and bias angle ply
The present invention relates to a tyre (2) for vehicle wheels comprising a pattern (30) in at least a portion of a surface thereof, said pattern (30) comprising a first set of sinusoidal lines (31) equal to each other that extend along a first direction (X). The lines of the first set of lines (31) follow each other along a direction perpendicular to the first direction (X) without any other sinusoidal lines extending along the first direction (X) other than the sinusoidal lines of said first set being present between two consecutive sinusoidal lines of said first set. The pattern (30) also comprises a second set of sinusoidal lines (32) equal to the first set of sinusoidal lines (31) apart from the fact that the sinusoidal lines (32) of said second set extend along a second direction (Y) inclined with respect to the first direction (X) so that the lines of the first set of lines (31) intersect with the lines of the second set of lines (32).
The present invention relates to a tyre (2) for vehicle wheels comprising a pattern (30) in at least a portion of a surface thereof, said pattern (30) comprising a first set of sinusoidal lines (31) that extend along a first direction (X). The lines of the first set of lines (31) are consecutive to each other along a direction perpendicular to the first direction (X) and all have a same amplitude a of base value A which is constant along the first direction (X) except at predefined points spaced apart from each other by a predetermined fixed step K along the first direction where the amplitude a of each line deviates randomly from the base value A taking values comprised between A - 5 and A + 5, where 8 is a predetermined amount of deviation greater than 0. The pattern (30) also comprises a second set of lines (32) equal to the lines of the first set of lines (31) apart from the fact that they extend along a second direction (Y) inclined with respect to the first direction (X) so that the lines of the first set of lines (31) intersect with the lines of the second set of lines (32).
A tyre includes a tread band, a tread surface which is radially external to the tread band, and a plurality of blocks formed on the tread band. Each block is at least partially delimited by a groove which defines a flank of the block. The flank is joined to a tread surface portion. The tread surface portion is defined on the block in the region of an edge of the block. There are, on a portion of the edge, a plurality of consecutive recesses and, in the region of at least two of these recesses, there is a respective block portion which defines a protrusion. The protrusion projects from the flank of the block towards the inner side of the groove and extends as far as a bottom of the groove.
UNIVERSITA' DEGLI STUDI DI MILANO - BICOCCA (Italy)
Inventor
Tadiello, Luciano
Giannini, Luca
Zoia, Luca
Carnevale, Mattia
Abstract
The present invention relates to a tyre for vehicle wheels which comprises at least one structural element comprising a vulcanised elastomeric compound obtained by vulcanisation of a vulcanisable elastomeric composition comprising per 100 phr of diene elastomeric polymer: (i) a predispersion of a diene elastomeric polymer and epihalohydrin-functionalised lignin, in an amount to provide the elastomeric composition with 100 to 10 phr of diene elastomeric polymer and an amount of epihalohydrin-functionalised lignin equal to or greater than 5 phr, (ii) from 0 to 90 phr of at least one diene elastomeric polymer, (iii) from 0 to 110 phr of a reinforcing filler, (iv) from 0.1 to 12 phr of at least one vulcanising agent.
The present invention relates to a tyre for vehicle wheels which comprises at least one structural element comprising a vulcanised elastomeric compound obtained by vulcanisation of a vulcanisable elastomeric composition comprising per 100 phr of diene elastomeric polymer: (i) a predispersion of a diene elastomeric polymer and nanometric lignin, in an amount to provide the elastomeric composition with 100 to 10 phr of diene elastomeric polymer and an amount of nanometric lignin equal to or greater than 5 phr, (ii) from 0 to 90 phr of at least one diene elastomeric polymer, (iii) from 0 to 110 phr of a reinforcing filler, (iv) from 0.1 to 12 phr of at least one vulcanising agent, where said nanometric lignin comprises lignin particles having an average hydrodynamic diameter D50 lower than 500 nm and greater than 50 nm.
A tyre for vehicle wheels comprises a support structure and a tread band arranged in a radially outer position with respect to the support structure. The support structure comprises at least one reinforcing layer including a plurality of hybrid reinforcing cords (10′) each having a metallic wire (21) twisted together with a multifilament textile yarn (22) comprising a plurality of filaments (23). In any cross section of each of said hybrid reinforcing cords (10′), the metallic wire (21) is at least partially embedded in the filaments (23) of the multifilament textile yarn (22).
12 - Land, air and water vehicles; parts of land vehicles
Goods & Services
Tires; pneumatic, semi-pneumatic and/or solid tires; wheels
for vehicles; rims; inner tubes and/or other supports to be
inserted between tire and rim, namely mousse for tires.
A tyre (1) for vehicle wheels comprises a first block (60), a second block (70) and a third block (80), which are at least partially delimited laterally by a first main groove (10) and said second main groove (20) and are separated from each other by a first secondary groove (30) and a second secondary groove (40). Each edge (61; 71) of the first block (60), the second block (70) and the third block (80) facing the first secondary groove (30) or the second secondary groove (40) comprises at least a first edge portion (61a, 71a; 77a, 81a), defined by an angular edge, and at least a second edge portion (61b, 71b; 77b, 81b), adjacent to the first edge portion (61a, 71a; 77a, 81a) and defined by a chamfer, connected to each other by at least a first connecting angular edge (63, 73; 78, 83) extending over said tread surface portion. The first edge portion (61a, 71a; 77a, 81a) and the first connecting angular edge (63, 73; 78, 83) define a first angle (A, A'; A1, A1') on the portion of tread surface (3) whose bisector (R, R'; R1, R1') is inclined with respect to a circumferential direction defined on the tread band by an angle of less than 15°.
A method of depositing a continuous elongated element onto a building drum in a process for building tyres for vehicle wheels, comprises: i) dispensing a continuous elongated element (23) onto a forward branch of a conveyor belt (49) until a head of the continuous elongated element (23) is brought to said building drum (15); ii) stopping the head while continuing to dispense the continuous elongated element (23) and progressively deforming the forward branch into a zigzag shape, lengthening it, to accumulate the continuous elongated element (23) while the head remains still; iii) advancing the head, applying it on the building drum (15) and at least partially winding the continuous elongated element (23) on the building drum (15) by rotating the building drum (15). During winding, the continuous elongated element (23) is dispensed with a dispensing speed (Ve) lower than a peripheral speed (Vp) of the building drum (15) and the deformation of the forward branch is progressively reduced to at least partially compensate for a difference between the dispensing speed (Ve) and the peripheral speed (Vp).
An apparatus for depositing a continuous elongated element onto a building drum in a process for building tyres for vehicle wheels comprises a variable capacity storage device (29) comprising: a plurality of rollers (33, 42), a conveyor belt (49) engaged with said rollers (33, 42), a support structure (30), a carriage (31) mounted on the support structure (30). The plurality of rollers (33, 42) comprises: a first fixed set (41) of rollers and a second fixed set (44) of rollers mounted on the support structure (30), a first movable set (32) of rollers and a second movable set (34) of rollers mounted on the carriage (31). The carriage (31) is movable between a first position, in which a straight line tangent to an upper lateral surface of the rollers (33) of the first movable set (32) lies on one side of a straight line tangent to a lower lateral surface of the rollers (42) of the first fixed set (41) opposite the second movable set (34), and at least one second position, in which both the first movable set (32) and the second movable set (34) are positioned between the first fixed set (41) and the second fixed set (44).
A tyre (1) for vehicles wheels comprises a tread band (2), on which there are defined main pair of grooves (10, 20) between which a first secondary main groove (30), and a first and second block (60, 70) delimited by the pair of main grooves and separated from each other by the first secondary groove (30). Both the edge (61) of the first block (60) and the edge (71) of the second block (70) facing the first secondary groove (30) comprise at least three edge portions, adjacent to each other and comprising at least a first edge portion (61a; 71a) defined by a chamfer and at least a second edge portion (61b; 71b) defined by an angular edge, alternating with each other. Each first edge portion (61a) of the first block (60) is aligned with a second edge portion (71b) of the second block (70), and each second edge portion (61b) of the first block (60) is aligned with a first edge portion (71a) of the second block (70).
A tyre includes a plurality of blocks which are defined on a tread band and at least one first sipe and one second sipe which are formed on each block. The first sipe extends in a first longitudinal direction and comprises a first linear portion, only one single-wave portion which extends in continuation of the first linear portion and which has a distance from the first edge between 5% and 40% of the distance between the first edge and an opposite second edge, and a second linear portion. Similarly, the second sipe extends in a second longitudinal direction and comprises a first linear portion, only one single-wave portion which extends in continuation of the first linear portion and which has a distance from the second edge between 5% and 40% of the distance between the first edge and the second edge, and a second linear portion.
A process for building tyres for wheels of vehicles, with the following building operations: winding a cut-to-size semifinished element around a forming drum, thereby forming a corresponding component of a tyre, wherein the semi-finished element has opposite ends juxtaposed with each other to form a junction zone; repeating the winding operation until completion of the building operations on the forming drum. During the building operations, a checking operation is performed on the tyre, including: acquiring a two-dimensional image of the tyre; identifying, in the image, at least one junction zone in a radially external position of the tyre; providing reference images, each representing a junction zone type; comparing the at least one identified junction zone with each reference image; selecting a junction zone type; classifying the at least one identified junction zone on the basis of the junction zone type; and generating a stop or a consent signal.
A plant for producing tyres for vehicle wheels is described. The plant includes a building line configured to build a crown structure. The building line includes a building device configured to build a belt assembly. The building device includes a trolley, a first forming drum, a second forming drum, a first working area including a belt building device, a second working area downstream from the first working area including a depositing device, a first service area downstream from the second working area including a stationary annular holding member, and a second service area downstream from the first service area including a first support member.
A tyre (1) for vehicle wheels comprises a tread band (2) on which a first main groove (10) and a second main groove (20) are defined, as well as at least one secondary groove (30; 40) which extends between the first main groove (10) and the second main groove (20). The secondary groove (30; 40) comprises a central region (33; 43), having a depth less than a depth of the first main groove (10) and the second main groove (20), and a first end region (34; 44) which extends between the central region (33; 43) and the first main groove (10), having an increasing depth from the central region (33; 43) towards the first end (31; 41).
A pneumatic tyre (1) for vehicle wheels comprises a tread band (2) on which a first main groove (10) and a second main groove (20) are defined, as well as a first secondary groove (30) and a second secondary groove (40) which extend between the first main groove (10) and the second main groove (20) and having respectively a first depth (P1) and a second depth (P2), different from each other. A sipe (33) is formed in the bottom (34) of the first secondary groove (30).
A tyre includes a plurality of blocks which are defined on a tread band and at least one first sipe which is formed on each block. The first sipe extends in a first longitudinal direction and includes a first linear portion which substantially extends along the first longitudinal direction, a single-wave portion which extends in continuation of the first linear portion, and a second linear portion which extends in continuation of the single-wave portion. The single-wave portion includes a first segment which extends from the first linear portion as far as a first peak, a second segment which extends from the first peak as far as an opposite second peak and a third segment which extends from the second peak as far as the second linear portion. The angle of inclination of second segment is greater than that of the first segment and the third segment.
The present invention relates to a novel sustainable polyester obtained by the copolymerization of at least one diol, preferably at least two diols, at least one dicarboxylic acid, preferably at least two dicarboxylic acids, more preferably three dicarboxylic acids, and optionally at least one hydroxycarboxylic acid or cyclic lactones thereof, as defined in the description, to a vulcanizable elastomeric composition comprising such a novel sustainable polyester, and to a tire for vehicle wheels and a structural component thereof manufactured with such a vulcanizable elastomeric composition.
B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
B60C 11/00 - Tyre tread bandsTread patternsAnti-skid inserts
C08G 63/47 - Polyesters chemically modified by esterification by unsaturated monocarboxylic acids or unsaturated monohydric alcohols or reactive derivatives thereof
C08G 63/50 - Polyesters chemically modified by esterification by monohydric alcohols
C08G 63/685 - Polyesters containing atoms other than carbon, hydrogen, and oxygen containing nitrogen
C08G 63/688 - Polyesters containing atoms other than carbon, hydrogen, and oxygen containing sulfur
The present invention relates to a vulcanizable elastomeric composition comprising a diene elastomeric polymer, a reinforcing filler, at least one vulcanizing agent, and an amorphous polyester obtained by the copolymerization of at least one diol, preferably at least two diols, at least one dicarboxylic acid, preferably at least two dicarboxylic acids, more preferably three dicarboxylic acids, and optionally at least one hydroxycarboxylic acid or cyclic lactones thereof, as defined in the description, and to a tire for vehicle wheels or a green structural component thereof comprising such a vulcanizable elastomeric composition.
A moulded and vulcanised tyre (5) comprises a radially internal surface (6), having an application area (A) on which a plurality of gas escape routes are created, and a functional insert (1) having an adhesive surface (4a) and an exposed surface (4b) facing away from the adhesive surface (4a). The adhesive surface (4a) is adhered to the radially internal surface (6) of the tyre at the application area (A). The plurality of gas escape routes is configured to evacuate a gas interposed between the adhesive surface (4a) of the functional insert (1) and the radially internal surface (6) of the tyre (5) so as to maximise the contact between the adhesive surface of the functional insert and the radially internal surface of the tyre.
A pressing bladder (103) for a vulcanisation mould (100) has a radially external surface (105) configured to adhere to a radially internal surface of a green tyre (5a) during a moulding and vulcanisation step of the green tyre to obtain a moulded and vulcanised tyre (5). The radially external surface (105) comprises reliefs (107) having the shape of ribs (110) or columns (111) and bridges (112).
A tyre (1 ) for motorcycle wheels is described comprising an equatorial plane (X- X) free from transversal grooves and a tread band (8) extending according to an axial development (L), wherein the tread band (8) comprises, in a plan development thereof, two lateral annular portions (L2, L3) arranged on opposite sides with respect to said equatorial plane (X-X) and each comprising a first lateral annular sub-portion (L2', L3'), proximal with respect to the equatorial plane (X-X), and a second lateral annular sub-portion (L2", L3"), distal with respect to the equatorial plane (X-X). In the tread band (10), a plurality of transversal grooves (12) is defined, which are formed in the lateral annular portions (L2, L3), each having an axial extension equal to at least 30% of the axial half-development (L/2) of the tread band (10) and a first directrix (g') forming with the equatorial plane (X-X) an angle (alpha) having a minimum value (alpha'a) comprised between 15° and 50° at an end (12'a) proximal to the equatorial plane (X-X). The transversal grooves (12) form a circumferential succession of transversal ribs (13) extending up to the axial ends of the tread band (10) and having a first portion (13') having an increasing width moving away from the equatorial plane (X-X) in a first annular sector (S) proximal to the equatorial plane (X-X).
12 - Land, air and water vehicles; parts of land vehicles
Goods & Services
(1) Tires; pneumatic, semi-pneumatic and/or solid tires; wheels for vehicles; rims; inner tubes and/or other supports to be inserted between tire and rim, namely mousse for tires.
A tyre and related vulcanisable elastomeric compound and elastomeric composition are described. The tyre includes at least one structural element that includes a vulcanised elastomeric material including, before vulcanisation, a vulcanisable elastomeric compound including, before mixing, an elastomeric composition including per 100 phr of diene elastomeric polymer:
(a) 30 to 95 phr of at least one styrene-butadiene polymer (SBR);
(b) 5 to 70 phr of at least one diene elastomeric polymer selected from the group consisting of at least one isoprene polymer (IR), at least one butadiene polymer (BR), or mixtures thereof;
(c) 10 phr to about 120 phr, preferably 20 phr to 100 phr, of at least one white reinforcing filler;
(d) from about 1% to about 20% by weight, relative to the amount of said white reinforcing filler, of at least one silane coupling agent;
(e) 1% to 35% by weight, preferably 5% to 25% by weight, relative to the amount of said silane coupling agent, of a polyamine.
The present invention relates to a big enduro motorcycle tyre for mainly off-road use. By virtue of the particular “cap and base” arrangement of the tread band and to the specific mechanical properties of the compounds which constitute it, the tyre of the invention improves performance both off-road and in road driving, both on dry and wet surfaces.
An off-road motorcycle tyre comprises a tread band having a central annular portion extending astride of an equatorial plane (X-X) of the tyre (1) and comprising: - a plurality of circumferentially consecutive central blocks (15) arranged astride of the equatorial plane (X-X) and having a first width (LI) in the axial direction; - a plurality of circumferentially consecutive first lateral blocks (20) arranged next to the central blocks (15) and having a second width (L2) in the axial direction; - a plurality of circumferentially consecutive second lateral blocks (60) arranged next to the central blocks (15) on the opposite side with respect to said plurality of first lateral blocks (20) and having said second width (L2) in the axial direction; wherein the ratio between said second width (L2) and said first width (LI) is comprised between 0.65 and 1.3.
An off-road motorcycle tyre comprises a tread band having a maximum chord (C). The tread band comprises a central annular portion (M) extending astride of an equatorial plane (X-X) of the tyre (1) and comprising a plurality of circumferentially consecutive first central blocks (15) arranged next to the equatorial plane (X-X) and a plurality of circumferentially consecutive second central blocks (50) arranged next to the equatorial plane (X-X) on the opposite side with respect to the first central blocks (15), each second central block (50) being axially adjacent to a respective first central block (15). An intermediate annular portion (5) without blocks is arranged astride of the equatorial plane (X-X) and extends between the first central blocks (15) and the second central blocks (50). Each first central block (15) and the respective second central block (50) are arranged at a respective minimum mutual distance in the axial direction such that the ratio between said minimum mutual distance and said predetermined maximum chord (C) is greater than, or equal to, 0.15.
A vehicle wheel tyre comprises a tread band, a tread surface, a plurality of blocks defined on the tread band, and at least one sipe formed on at least one of the blocks. The at least one sipe is open on a tread surface portion and at least on one first edge of the block, to define at least one first edge portion and at least one second edge portion adjacent to each other and at least partially bounded by the sipe. The first edge portion is defined by a chamfer extending between the tread surface portion and a wall of the block, and the second edge portion is defined by a corner resulting from the tread surface portion intersecting the wall.
A tyre (1) for motorcycle wheels is described comprising a tread band (8) of the “cap-and-base” type comprising a radially outer portion, formed by a central sub-portion (11a) made with a first vulcanized elastomeric material and by a pair of lateral sub-portions (11b, 11c) made with a second vulcanized elastomeric material, and a radially inner portion (12) made with a third vulcanized elastomeric material. The first vulcanized elastomeric material of the central sub-portion (11a) has a dynamic elastic modulus (E′) measured at a frequency of 10 Hz and at 23° C. greater than the dynamic elastic modulus (E′) measured in the same conditions of the second vulcanized elastomeric material of the lateral sub-portions (11b, 11c) and both such vulcanized elastomeric materials have a respective dynamic elastic modulus (E′), again measured at a frequency of 10 Hz and at 23° C., comprised between 5.2 and 6.5 MPa and greater than the dynamic elastic modulus (E′) of the third vulcanized elastomeric material, measured in the same conditions. In the tyre (1), the ratios R1 and R2 between the dynamic elastic modulus and the tandelta of the second vulcanized elastomeric material of the lateral sub-portions (11b, 11c) of the radially outer portion and the dynamic elastic modulus and the tandelta of the third vulcanized elastomeric material of the radially inner portion (12) of the tread band (8), respectively measured at a frequency of 10 Hz and at 100° C. and at a frequency of 10 Hz and at 70° C., are comprised between 0.8 and 1.2.
Method, and system (99), of interacting with a monitoring device (1) fixed to an inner surface (2) of a tyre (3) mounted on a rim, the system (99) comprising a source (90) configured for providing, upon request, an identification code of the monitoring device (1) univocally associated with the monitoring device (1), wherein the source (90) comprises at least one physical means (91) firmly applied to the tyre (3), and an interrogation device (92) configured to obtain the identification code of the monitoring device (1) from the source (90) by at least one respective interaction with the physical means (91), and for performing at least one interaction with the monitoring device (1) based on the identification code of the monitoring device (1) obtained.
