Abrégé

A brake adjuster for adjusting the working clearance of the shoes (11,12) of an automotive drum brake (10). The adjuster has three co-axial elements, a first end element having a head portion (25) for engagement with a first brake shoe (12) and a threaded stem portion (29), an intermediate element (28) in threaded engagement with the first end element (29), and a second end element having a head portion (27) for engagement with a second brake shoe (11) and a stem portion slideably connected with the intermediate element (28) and free to rotate relative thereto. A reaction member (30) is mounted on the intermediate element (28), and a toothed ring gear (35) for rotates with the intermediate element and is axially located between the second end element (27) and the reaction member (30). A leaf spring (31) acts between the second end element (27) and the reaction member (30) for pushing the second end element away from the intermediate element. The leaf spring (31) carries a pawl (36) designed to engage the teeth (35a) of the ring gear (35) for rotation of the ring gear to adjust the effective length of the adjuster. The reaction member (30) has resilient formations which snap into a co-operating formation (43) on the intermediate element.

Classes IPC  ?

• F16D 65/56 - Dispositifs de réglage mécaniques agissant automatiquement dans une direction pour le réglage d'un jeu excessif à filetage et écrou

Abrégé

A drum brake backplate (17) having a vibration clamping mass (30) secured thereto. One or more portions (31) of the mass are secured to the backplate and the remainder of the mass is spaced from the backplate and defines one or more further portions which are tuned to vibrate relative to the backplate at a frequency which reduces the noise generated by one or more a target frequencies (or range of frequencies) of the backplate. The mass may be in the form of an elongate rod or strip member of arcuate form which is secured to the backplate at one or more locations adjacent the rim of the backplate. This can be effective in reducing noise which emanates from the vibration of the backplate in a region adjacent a hydraulic actuating cylinder (14) of the brake.

Classes IPC  ?

• F16D 51/00 - Freins avec organes de freinage se déplaçant vers l'extérieur coopérant avec la surface intérieure d'un tambour ou d'une pièce analogue
• F16D 65/00 - Éléments constitutifs ou détails des freins

Abrégé

A drum brake has a pair of brake shoes (40) moveable radially outwardly into contact with an associated brake drum to provide a handbrake function by a cross strut (100) which acts between the brake shoes or between pivoting brake operating levers (14) which actuate the brake shoes. A handbrake lever (18) is pivoted on one brake shoe or brake operating lever (14) and contacts one end of the strut to displace the other brake shoe or brake operating lever towards the drum to apply the associated shoe against the drum and by reaction through the strut to also force the other brake shoe or brake operating lever toward the drum to apply the other shoe against the drum. The strut (100) is in two parts (101,102), one part being connected for movement with each respective brake shoe or operating lever, the strut parts having inter-engageable formations in the form of teeth (103, 104) which when engaged allow the strut (100) to transmit axial force between the shoes or operating levers. Bias means (105,106) are provided for biasing the strut parts apart to disengage the inter-engageable formations to disable the strut, the inter-engageable formations (103, 104) being engaged when the handbrake lever (18) is operated to connect the strut parts (101,102) to allow the brake to be applied and being disengaged when the handbrake lever is released so that the strut parts can disengage and move apart with the brake shoes or brake operating levers to adjust the effective length of the strut as the brake shoes wear.

Classes IPC  ?

• F16D 65/54 - Dispositifs de réglage mécaniques agissant automatiquement dans une direction pour le réglage d'un jeu excessif par réglage linéaire direct

Abrégé

A drum brake has two brake shoes (11,12), an actuator (14a) located between the shoes which moves the shoes apart into contact with an associated drum, retraction spring means (33) which retract the shoes away from the drum when the actuator is released,, and a cross strut (18) which extends between the shoes and controls the retraction of the shoes away from the drum. The cross-strut is in two parts (18a, 18b) with interengaging tooth means (26,27) on each part which are biased into engagement, to hold the strut at a given effective length. One part (18a) of the cross-strut moves with a first shoe (12) and the other part (18b) of the cross-strut has a nose portion (29) which engages a cut-out (30) in the other shoe (11) with a first clearance (x) which allows the other shoe to move relative to the nose for a first predetermined distance. The shoes moving in opposite directions when applied by the actuator (14a) until the first clearance (x) is taken up and then any further movement required to engage the shoes with the drum results in sliding movement between the first and second parts of the cross-strut. If this required movement exceeds the pitch of the engaging tooth means (26,27) on the strut parts the effective length of the strut is permanently adjusted by re-engagement of tooth means in a new engaged position with different elements of the tooth means in contact in order to maintain the shoe retraction substantially constant as the shoes wear.

Classes IPC  ?

• F16D 65/54 - Dispositifs de réglage mécaniques agissant automatiquement dans une direction pour le réglage d'un jeu excessif par réglage linéaire direct

Abrégé

A disc brake having a support structure (11) for attachment to a vehicle and a caliper (14) which spans an associated disc (13) and is supported for sliding relative to the disc on the support structure. The caliper includes an actuation piston (15) which is moveable within the caliper in a direction generally parallel to an axis of rotation of the associated disc to move a first brake pad (18a) into contact with a first side of the associated disc and to cause sliding displacement (X) of the calliper relative to the support structure (11) to draw a second brake pad (18b) into contact with the other side of the disc (13). The sliding displacement (X) of the calliper (14) relative to the support structure (11) is guided by the engagement of the piston (15) in a bore (17) formed in the support structure and a ball and ramp mechanism 24 moves the piston (15) relative to the calliper (14).

Classes IPC  ?

• F16D 55/226 - Freins à surfaces de freinage substantiellement radiales pressées l'une contre l'autre dans une direction axiale, p. ex. freins à disques avec disques ou patins déplaçables selon l'axe pressés contre des organes en rotation situés dans l'axe par serrage entre des organes mobiles de freinage, p. ex. des disques ou des patins de freins mobiles avec un organe d'actionnement commun pour les organes de freinage les organes de freinage étant des patins de freins dans lesquels l'organe d'actionnement commun se déplace axialement
• F16D 65/14 - Mécanismes d'actionnement pour freinsMoyens pour amorcer l'opération de freinage à une position prédéterminée

Abrégé

A drum brake (10) is provided which has a pair of brake pads (12), each pad being moveable generally radially outwardly into contact with a brake drum by a respectiv operating lever (14) which is acted on at one end by a brake applying means (15) and pivoted (16) at the other end from a backplate (11). Each pad is contacted by a portion (14c) of the respective operating lever intermediate the lever ends and is moved radially outwardly between a pair of circumferentiaËy spaced abutments (45) which extend generally perpendicular to the backplate (11) and which react braking torque when the brake is applied. The required pad to drum clearance is established by knock-back of the drum on the pads (12).

Classes IPC  ?

• F16D 51/14 - Freins avec organes de freinage se déplaçant vers l'extérieur coopérant avec la surface intérieure d'un tambour ou d'une pièce analogue ayant la forme de sabots de freins exclusivement mobiles radialement actionnés par fluide
• F16D 65/56 - Dispositifs de réglage mécaniques agissant automatiquement dans une direction pour le réglage d'un jeu excessif à filetage et écrou

Abrégé

A brake has a pair of brake pads (12) , each pad being moveable generally radially outwardly into contact with a brake drum by a respective operating lever (14) acted on at one end by a brake applying means (15) and pivoted (16) at the other end from a backplate (11) . Each pad is contacted by a portion (14c) of the respective operating lever intermediate the lever ends and moving radially outwardly between a pair of circumf erentially spaced abutments (45) which extend generally perpendicular to the backplate and which react braking torque when the brake is -applied. Each lever (14) is pivoted on the backplate (11) by a pin (16) which extends generally perpendicular to the backplate. The free ends of the pins (14) are connected by a bracing link (50) to help to control the deflection of the pins (16) when the brake is applied.

Classes IPC  ?

• F16D 51/14 - Freins avec organes de freinage se déplaçant vers l'extérieur coopérant avec la surface intérieure d'un tambour ou d'une pièce analogue ayant la forme de sabots de freins exclusivement mobiles radialement actionnés par fluide
• F16D 65/56 - Dispositifs de réglage mécaniques agissant automatiquement dans une direction pour le réglage d'un jeu excessif à filetage et écrou

Abrégé

A parking brake is described which has a backplate, first and second brake shoe portions mounted on the backplate, a drum encircling the brake shoe portions, a parking lever pivoted adjacent one end on one of the brake shoe portions, and a strut extending between a first abutment on the parking lever and a second abutment on the other of the brake shoe portions. The backplate includes a viewing opening, and the parking lever and the one brake shoe portion include datum surfaces visible through the viewing opening from which the position of the parking lever relative to the brake shoe portion can be assessed.

Classes IPC  ?

• F16D 65/14 - Mécanismes d'actionnement pour freinsMoyens pour amorcer l'opération de freinage à une position prédéterminée

Abrégé

A brake has a pair of brake pads (12), each pad being moveable generally radially outwardly into contact with a brake drum by a respective operating lever (14) acted on at one end by a brake applying means (15) and pivoted (16) at the other end from a backplate (11). Each pad is contacted by a portion (14c) of the respective operating lever intermediate the lever ends and moving radially outwardly between a pair of circumferentially spaced abutments (45) which extend generally perpendicular to the backplate and which react braking torque when the brake is applied. One end of each abutment (45) is supported from the backplate and the other free ends of the abutments is linked circumferentially (46) to each other to brace the pair of abutments against relative circumferential deflection when the brake is applied. The pivots (16) of the levers may also be connected by a bracing link (75) to help to control the deflection of the pivots when the brake is applied.

Classes IPC  ?

• F16D 51/22 - Freins avec organes de freinage se déplaçant vers l'extérieur coopérant avec la surface intérieure d'un tambour ou d'une pièce analogue ayant la forme de sabots de frein pivotant autour d'un axe fixe ou à peu près fixe avec deux sabots de freins disposés à partir de leurs pivots dans des directions opposées actionnés mécaniquement