Abstract

Bi-helical toothed wheel (1) with non-encapsulating profile (4) for hydraulic gear apparatuses (2), configured to be bound to a support shaft (5) to form a driving or driven wheel of said hydraulic apparatus and comprising a plurality of teeth (6) extending with variable helix angle with a composite function in the longitudinal or axial direction of the tooth (6), wherein the teeth profile (4) keeps a shape continuity in each cross section thereof, wherein each tooth (6) in the longitudinal direction is divided into five zones: initial (A), proximal intermediate (B), central (C), distal intermediate (D) and terminal (E), where said initial (A), central (C) and terminal (E) zones have a variable helix angle (ψ) and said proximal intermediate (B) and distal intermediate (D) zones have a constant helix angle (ψ).

IPC Classes  ?

• F04C 2/08 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
• F04C 2/16 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
• F04C 2/18 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms

Abstract

Connection assembly (11) for screw pump, having an unusually limited overall axial dimension, comprising: a drive screw; a first half-coupling (13) arranged to be keyed on a drive shaft; a second half-coupling (14) integral with said drive screw and arranged to couple with said first half-coupling (13); and an elastomeric insert (18) arranged to be interposed between said first half-coupling (13) and said second half-coupling (14) in the coupled configuration.

IPC Classes  ?

• F04C 2/16 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
• F04C 15/00 - Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups

Abstract

1ccelelele).

IPC Classes  ?

• F04C 2/16 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
• F04C 2/08 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

Abstract

1ccece).

IPC Classes  ?

• F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
• F04C 2/08 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

Abstract

Improved bushing assembly (10) for supporting the shafts of the intermeshed rotors of a positive displacement rotary pump avoiding, jamming, said bushing assembly (10) comprising on a lateral surface (13) thereof at least one compensation tank (15; 16) facing a suction side of the pump and at least one bleed channel (14) which connects said compensation tank (15; 16) to the discharge side.

IPC Classes  ?

• F04C 2/18 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
• F04C 15/00 - Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups
• F16C 27/02 - Sliding-contact bearings
• F16C 15/00 - Construction of rotary bodies to resist centrifugal force

Abstract

A gear wheel (10) for a hydraulic apparatus is rotatable about an axis of rotation (H-H) and comprises a plurality of teeth (11) having a sectional profile (P) and being adapted to mesh with respective teeth of another gear wheel during a rotational motion about the axis of rotation (H-H), wherein at least one tooth (11) is shaped so as to have at least one cutting edge (12) configured to remove material, in particular chips, from a body which is contacted by said cutting edge during the rotation of the gear wheel (10). Suitably, the cutting edge (12) is defined by at least one groove (14) which is lowered by amount from 0.2% to 5% of the height (H') of the tooth (11), said groove (14) decreasing away from the cutting edge (12) along the profile (P).

IPC Classes  ?

• F01C 1/08 - Rotary-piston machines or engines of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
• B23F 15/08 - Making intermeshing rotors, e.g. of pumps
• F04C 2/08 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing

Abstract

An axial piston pump (10), which has an extraordinary noiselessness, includes a housing (11), a cylinder block (12) in the housing (11), a plurality of cylinders (13) arranged around an axis of the cylinder block (12), a corresponding plurality of pistons (14), each piston being slidable in the respective cylinder of the plurality of cylinders (13), and a fluid distributor (15) associated with the cylinder block (12). The axial piston pump (10) also comprises a frontal cam profile (23) including a plurality of cam lobes (25), each lobe comprising a delivery ramp (R1) and a suction ramp (R2), at least two pistons of the plurality of pistons (14) having an end portion (21) that protrudes from the respective cylinder and is a follower (22) simultaneously engaging with a same type of ramp of a relative lobe of the plurality of cam lobes (25).

IPC Classes  ?

• F04B 1/20 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
• F04B 9/04 - Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
• F04B 11/00 - Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation

Abstract

A radial piston pump (10), which has an extraordinary noiselessness, includes a housing (11), a cylinder block (12) in the housing (11), a plurality of cylinders (13) radially arranged in the cylinder block (12), a corresponding plurality of pistons (14), each piston being slidable in the respective cylinder of the plurality of cylinders (13), and a fluid distributor (15) associated with the cylinder block (12). The radial piston pump (10) also comprises a cam profile (18) including a plurality of cam lobes (20), each lobe comprising a delivery ramp (R1) and a suction ramp (R2), at least two pistons of the plurality of pistons (14) having an end portion (16) that protrudes from the respective cylinder and is a follower (17) simultaneously engaging with a same type of ramp of a relative lobe of the plurality of cam lobes (20).

IPC Classes  ?

• F04B 1/04 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
• F04B 1/047 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders
• F04B 1/107 - Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the outer ends of the cylinders
• F04B 11/00 - Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
• F04B 49/00 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups
• F04B 49/12 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups by varying the length of stroke of the working members

Abstract

A geared positive-displacement machine (10), comprising a housing (11) provided with a suction port and with a discharge port, a pair of gearwheels (14, 15) that are housed and supported by respective shafts (16, 18) for the rotation in a space inside the housing (11) and in fluid communication with the suction port and the discharge port, wherein the gearwheels (14, 15) mesh with each other and have parallel or coinciding axes and a first wheel (14) thereof is driving and a second wheel (15) is driven, a pair of containment bodies (19, 20) for axially containing the wheels (14, 15), said containment bodies (19, 20) being associated with the housing (11) and each comprise a first face (19a, 20a) that faces the pair of gearwheels (14, 15) and a second face (19b, 20b) that is axially opposite with respect to the first face (19a, 20a), and, for each of the two wheels (14, 15), a plurality of rolling bodies (21) that form a crown and that are freely housed in an annular seat (22) that is coaxial to the respective shaft (16, 18) and that is defined at the interface between the first face (19a, 20a) of at least one of the two containment bodies (19, 20) and the surface (14a, 15a; 14b, 15b) of the wheels (14, 15) that in turn faces it, respectively in the first face (19a, 20a) of at least one of the two containment bodies or in the surface (14a, 15a; 14b, 15b) of the gearwheels facing the first face (19a, 20a), wherein the rolling bodies (21) rest on rolling tracks (23, 24) respectively integral with the wheels (14, 15) and with the at least one containment body (19, 20). Between the first face (19a, 20a) of the at least one containment body (19, 20) and the surface (14a, 15a; 14b, 15b) of the wheels (14, 15) facing the first face a distance (D) greater than zero exists.

IPC Classes  ?

• F04C 15/00 - Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups
• F04C 2/16 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type

Abstract

The invention concerns a gear wheel (2) having a plurality of identical teeth suitable for meshing in parallel with a similar second gear wheel in a casing (3) of a hydraulic machine, said gear wheel having a side face of the front toothing (21) and a side face of the rear toothing (22) suitable for dragging in rotation against a front bush (41) and a rear bush (42), respectively, said bushes (41, 42) being slotted onto a sleeve (20) fixedly connected to the gear wheel (2), said helical teeth extending along the entire gear wheel (2) between the front side face (21) and the rear side face (22), where both the side face of the front toothing (21) and the side face of the rear toothing (22) have, at each tooth, a removed rotor portion (2a, 2b, 2c), so as to have an area of the side faces of the toothing that does not come into contact with the bush when the latter is placed in abutment against the respective side face of the toothing of the gear wheel.

IPC Classes  ?

• F04C 2/08 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
• F04C 2/16 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type

Abstract

An improved geared hydraulic apparatus, comprising a pair of meshing gearwheels, mounted to be reciprocally rotatable in a casing between an inlet side and an outlet side for a fluid having, in use, a substantially transverse flow with respect to the axes of rotation of the gearwheels. The meshing gearwheels create, during their reciprocal rotation, progressive meshing configurations between respective co- operating teeth. In at least one of said progressive meshing configurations is defined, in at least one cross- section of the gearwheels, at least one closed area between respective fluid entrapment teeth. The closed area decreases until it is substantially cancelled out at and around at least one other, separate progressive meshing configuration between the aforesaid respective co-operating teeth.

IPC Classes  ?

• F01C 1/08 - Rotary-piston machines or engines of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
• F04C 2/08 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing