Abstract: A boot-type seal having a seal and a valve. The seal has a first seal member, which is configured to sealingly engage a first surface, and a second seal member, which is configured to sealingly engage a second surface. The valve is coupled to the seal and is operable in a first condition, which inhibits fluid communication therethrough, and a second condition, which permits fluid communication therethrough. The condition of the valve changes from the first condition to the second condition in response to a fluid pressure exerted on a side of the seal that exceeds a predetermined threshold pressure. A brake assembly that incorporates the boot-type seal is also provided.

Abstract: A transaxle for a small utility vehicle or implement, including a casing, at least one rotatable shaft disposed in and extending from the casing, at least one brake disc rotatably fixed to the rotatable shaft for rotation therewith, and at least one braking mechanism with at least a portion of the braking mechanism being externally mounted on the casing proximate the rotatable shaft. The braking mechanism includes at least one friction puck disposed proximate the brake disc, and a brake shaft including a cam surface having a longitudinal edge, wherein the brake shaft has an engaged position in which the longitudinal edge is in operative engagement with the friction puck and the friction puck is in pressing engagement with the brake disc and a disengaged position in which the longitudinal edge is out of operative engagement with the friction puck.

Abstract: A spot-type automotive disc brake of floating-twin disc and fixed-caliper format utilizes one or more single wire springs to bias the two floating friction elements with respect to the fixed caliper. Each spring exerts a differential resilient effect on the central friction element with respect to the floating side friction element by virtue of differential connection arrangements, thereby meeting the differential springing requirements.

Abstract: This invention relates to an improved pad retraction spring (30) adapted for use in a disc brake assembly. The disc brake assembly includes an anchor bracket (12) adapted to be secured to a vehicle component, a brake caliper (108) adapted to be secured to the anchor bracket, a pair of brake shoes (18, 20) carried by the disc brake assembly and adapted to be disposed on opposite axial sides of an associated brake rotor (106), and an actuation device for selectively moving the brake shoes into frictional engagement with the rotor. The anchor bracket includes a pair of outwardly extending arms (14, 16) and at least one of the arms has an opening (60) formed therethrough. The pad retraction spring is carried by the disc brake assembly and is operative to move the brake shoes from engagement with the rotor when the brake shoes are in a non-braking position. The pad retraction spring includes a central mounting portion (32) and a pair of outermost spring arms (38, 38′).

Abstract: A braking apparatus and method are provided for applying a braking force to the inboard and outboard sides of a brake rotor, through the use of a pair of pistons disposed in a back-to-back relationship in a cylinder bore of a housing, and defining a space between them in the cylinder bore for receipt of a pressurized fluid. The rotor is rotatable about a rotor axis, and the cylinder bore defines a bore axis extending parallel to the rotor axis. A first piston of the pair of pistons is slidably disposed in the cylinder bore for movement in a first direction along the bore axis toward the inboard side of the rotor for applying a braking force to the inboard side of the rotor, and the second piston of the pair of pistons is slidably disposed in the cylinder bore for movement in a second direction opposite the first direction along the bore axis for applying a braking force to the outboard side of the rotor.

Abstract: A wheel hub for vehicles has a built-in brake assembly for stopping and parking the vehicle. A parking piston and a spring assembly of the parking brake are arranged within the ring gear support member, and impact on the brake piston of the multi-plate friction type wet brake, and the ring gear support member. The parking brake has a device for manually de-activating the parking brake from outside the hub. The device includes a screw that overrides spring pressure to move the parking piston away from the brake piston to manually release the parking brake.

Abstract: The present invention provides a motorcycle that includes a frame, a wheel mounted to the frame for rotation with respect to the frame, a rotor mounted to the wheel, and a caliper selectively clamping the rotor to slow down the rotation of the wheel. A biasing member is provided between the rotor and the wheel and is offset from a fastener. The biasing member biases the rotor against the head of the fastener.

Abstract: The invention relates to a brake application device for a motor vehicle brake, in particular to a brake application device for a rail vehicle brake and preferably to a brake application device for a rail vehicle disc brake, comprising a braking force generator for applying and/or releasing the vehicle brake and a braking force converter for converting the energy delivered by the braking force generator into a brake application motion. The brake application device is characterised in that the braking force converter is configured in such a way that the force which is to be exerted by the braking force generator during braking, in order to generate a defined brake application force which is greater than zero and less than the maximum brake force, measures zero.

Abstract: A disc brake return spring comprises a V-shaped spring having two spring members, with each member ending in an engagement leg. Each engagement leg is angled with respect to the spring legs in a fashion so that the spring applies a moment to the friction pad to counteract rotation that occurs about the backing plate supports. The return spring is employed in a disc brake assembly having friction pads with backing plates that are disposed on either side of a rotor for braking purposes.

Abstract: The device, inserted between a motor (9) and a load (11), allows the load (11) to be immobilized when power is not applied to the motor (9) and allows mechanical torque to be transmitted when power is applied to the motor (9). Such a device is produced by virtue of a juxtaposition of brake disks connected alternately to the drive shaft (8) by pivoting connections and to a casing (10) containing the motor (9) by sliding connections, the end disks (1, 3) of the juxtaposition being in pivoting connection on the drive shaft (8) and by virtue of means (4, 5) collaborating to separate these disks and transmit the mechanical torque. The architecture of the device allows the string of dimensions associated with the functional clearance between the means (4, 5) to be reduced and allows the force exerted by the spring (6) on the disk (1) to be reacted by the bearing.

Abstract: A braking system for braking a rotor relative to a stator, the braking system comprising braking means respectively secured to the rotor and to the stator, a brake piston, return means for returning the piston to its braking position, a braking chamber, and a brake release chamber, which chambers are interconnected via a link duct serving to generate a flow of fluid in an assisted braking situation in which the braking chamber is connected to a fluid feed duct, while the brake release chamber is connected to a fluid return duct. The link duct is equipped with means for limiting the flow of the fluid at least in the direction going from the brake release chamber to the braking chamber.

Abstract: A vehicle brake assembly has a rotor that mounts to a shaft of the vehicle for rotation with it. The rotor has an annular braking surface. A hydraulic piston is non-rotatably mounted to the vehicle. The piston is movable axially relative to the rotor and has a braking surface for frictional engagement with the braking surface of the rotor when hydraulic fluid pressure is supplied to the piston. A coil body having an electromagnetic coil is axially movable relative to the rotor. A coil plate is mounted adjacent the coil body and is attracted to the coil body when electrical power is supplied to the coil. A coil spring is mounted between the coil plate and the coil body. The coil spring moves the coil plate away from the coil body causing braking action when the electrical power is removed from the coil.

Abstract: A friction device includes drive and driven members rotatable about a common axis and defining a housing therebetween in which a piston assembly is supported and an expandable chamber is defined. A clutch pack is interposed between the drive and driven members and has separation plates interleaved with friction plates. The piston assembly is adapted to move among disengaged, pre-staged, and engaged positions wherein the friction plates are disposed in non-contacting, proximate contacting, and contacting relationship, respectively, with the separation plates. In the engaged position, the piston assembly is disposed forcing such contacting relationship to actuate the clutch pack to connect the drive and driven members.

Abstract: A braking apparatus comprises a first contact unit arranged on the rotary shaft side of a wheel, at least a second contact unit for contacting the first contact unit for generating a friction force, an actuator for pressing the second contact unit against the first contact unit, and a control unit for controlling the operation of the actuator, wherein the control unit performs the position control operation for moving the second contact unit in such a manner that the interval between the first contact unit and the second contact unit is smaller than a preset distance, and the force control operation for pressing the second contact unit against the first contact unit in accordance with the required braking force.

Abstract: A disc brake includes a piston seal made of rubber that is shaped to fit into a seal groove on the inner surface of a cylinder of a caliper for a brake piston. To prevent braking effectiveness from being impaired, even if the temperature of a caliper rises in a disc brake for a vehicle, the piston seal and/or the seal groove is shaped to control and contain the effects of thermal expansion due to the heat of the disc brake. The clearance between the piston seal and the seal groove is removed and clearance is provided between parts of the periphery of the piston seal and the seal groove.

Abstract: A disc brake assembly includes a stationary member, a rotating member defining an axis of rotation, a plurality of stationary discs spaced axially along the axis of rotation within the stationary member, and a plurality of movable discs interspaced with the stationary discs. A brake coupler supports the movable discs. During non-braking vehicle operation, the movable discs and the brake coupler remain stationary relative to the stationary discs. During a braking maneuver, the coupler couples the movable discs to the rotating member such that the movable discs are caused to rotate with respect to the stationary discs. Once the coupler and rotating member are interconnected a piston moves the stationary and movable discs together to reduce rotation of the rotating member and brake the vehicle.

Abstract: A braking apparatus comprises a first contact unit arranged on the rotary shaft side of a wheel, at least a second contact unit for contacting the first contact unit for generating a friction force, an actuator for pressing the second contact unit against the first contact unit, and a control unit for controlling the operation of the actuator, wherein the control unit performs the position control operation for moving the second contact unit in such a manner that the interval between the first contact unit and the second contact unit is smaller than a preset distance, and the force control operation for pressing the second contact unit against the first contact unit in accordance with the required braking force.

Abstract: A disc brake caliper assembly is provided that includes a housing having a bore. A piston is arranged within the bore and is movable between normal retracted and knock-back positions. A linkage is adjacent to the piston and is movable between first and second positions with a clearance between the piston and the linkage in the first position. The clearance undesirably permits the piston to move to the knock-back position during severe operating conditions. An actuator, which also may be used as part an electric parking brake, moves the linkage from the first position to the second position to eliminate the clearance when the linkage is moved from the first position to the second position where the linkage abuts the piston. The linkage is connected to the caliper housing by a support. The linkage prevents the piston from moving from the normal retracted position to the knock-back position.

Abstract: A clamp device having a body made of a pair of half bodies connected and unified with a fixation member. One of friction plate units is elastically pushed by a first spring in a direction parting from a disc and in a rotating direction of the disc simultaneously, and the other of the friction plate units is elastically pushed by a second spring in a direction parting from the disc and in a reverse direction of the rotating direction simultaneously.

Abstract: The electric park brake of the present invention includes an electric caliper motor assembly. The electric caliper motor assembly includes a motor, which is operably coupled to a shaft. The motor and shaft are surrounded by a housing. A cogwheel is disposed axially and operably connected to the shaft within the housing. A solenoid mechanism is disposed on the housing and positioned axially in relation to the shaft. There is at least one guide pin that is associated with the solenoid mechanism for interacting with the cogwheel when the solenoid is activated. The interaction between the at least one guide pin and the cogwheel provides a park brake feature and prevents movement of the shaft.

Abstract: A selectively engageable torque transmitting mechanism has an apply piston, a plurality of first friction plates, a plurality of second friction plates, and a backing plate. The first friction plates are drivingly connected with one transmission member and the second friction plates are drivingly connected with another transmission member and alternately spaced with the first friction members. The friction plates are generally annular members having axial faces that are magnetized with opposite polarities. The magnetized faces of the first friction plates are disposed adjacent like polarity faces of the second friction plates to enforce separation thereof when the torque transmitting mechanism is in a disengaged state. The apply piston of the torque transmitting mechanism also has an annular face with a magnetic polarity disposed in opposition to an oppositely polarized surface on an adjacent member of the torque transmitting mechanism.

Abstract: A retraction device for a disc brake caliper is provided having brake pads actuated by hydraulic fluid. The device includes a housing having a bore that defines an axis. A piston is disposed within the bore and is movable along the axis between applied and retracted positions. The piston includes an apply end adapted to coact with the brake pads in the applied position and a hydraulic end opposite the apply end. A hydraulic chamber is defined by the bore and the hydraulic end and contains hydraulic fluid for generating a brake pressure to achieve the applied position. An annular groove is formed in the bore adjacent to the piston, and the annular groove includes a forward angled surface. A resilient seal is disposed within the annular groove for retracting the piston from the applied position to the retracted position. The resilient seal has a first side adjacent the forward angled surface and a second side opposite the first side.

Abstract: This invention relates to a pad retraction spring for use in a disc brake assembly. The pad retraction spring is operative to move the friction pads from engagement with the rotor when the friction pads are in a non-braking position. The pad retraction spring is effective to apply a first force against the friction pads when the friction pads are new, and effective to apply a second force against the friction pads when the friction pads are worn. The second force is greater than the first force, and at least one of the first force and the second force by itself is not sufficient to move at least one of the friction pads from engagement with the rotor when the friction pads are in the non-braking condition.

Abstract: A bearing device (10A) for supporting a wheel and equipped brake including a rotary shaft (5) carrying a rotary plate (9) suitable for supporting a wheel rim, a stationary hub (1C) disposed around the rotary shaft (5), a bearing unit comprising at least one rolling bearing (8A, 8B) supporting the shaft as it rotates relative to the hub, the brake comprising a first series of at least one annular brake disk (28) secured to the hub (1C) and a second series of at least one annular brake disk (30) constrained to rotate with the shaft (5) relative to the hub. The device includes first axial wall element (24) and a second axial wall element.

Abstract: A locking device (10) for an indexable spindle (1) to which a tool electrode is attached, comprises a brake disk (2) fixed to the spindle, an annular upper brake member (11) movable in the axial direction of the spindle between a first position and a second position closer to the brake disk than the first position, a annular lower brake member (13) movable in the axial direction of the spindle between a third position and a fourth position closer to the brake disk than the third position, an upper disk (21) arranged facing upper surface of the brake disk across a minimum gap when the upper brake member is at the first position, a lower disk (22) arranged facing lower surface of the brake disk across a minimum gap when the lower brake member is at the third position, and drive means for moving the upper and lower brake members in the axial direction of the spindle.

Abstract: The invention relates to a disc brake to be opened by torque, the disc brake being arranged between a drive shaft (3) and a driven shaft (11) and comprising a brake wheel (12) arranged on the driven shaft (3) non-rotatably in the peripheral direction; a friction surface (15) arranged to cooperate with the brake wheel (12); a spring device (14) arranged to press the brake wheel (12) axially against the friction surface (15) and means (19 to 21) causing, by the action of the torque and torsion of the drive shaft (3) and a possible counter-torque of the driven shaft (11), the brake wheel (12) and the friction surface (15) to drift axially apart and, accordingly, the braking coupling between them to loosen against the spring force of the spring device (14), whereby the drive shaft (3) and the driven shaft (11) are interconnected in such a way that they may turn a restricted rotational angle with respect to each other and that means for causing said axial displacement and for loosening the braking coupling compris

Abstract: An annular disk brake assembly having a housing mounted to a vehicle and a rotor disk mounted to a wheel of the vehicle. Annular brake pads extend parallel to the rotor disk within the housing and are mounted thereto with at least one brake pad being movable axially by an oil applied bladder mounted to the housing to move the first brake pad axially against the rotor disk. The rotor disk is adapted to slide axially to engage the second brake pad when pressure is applied to the rotor disk by the first brake pad and the bladder.

Abstract: Electrically operated braking system with a motor-driven disc brake including an electric motor for braking an automotive vehicle wheel, and a motor control device controlling the electric motor, the disc brake further including a disc rotor having a friction surface, a friction pad movable for contact with the friction surface to restrict rotation of the disc rotor, a pad support mechanism for supporting the friction pad movably in a direction intersecting the friction surface, a pad pressing mechanism including the electric motor and a pressing member, the electric motor producing a drive force for moving the pressing member to force the friction pad against the disc rotor, and a self-servo mechanism for providing a self-servo effect of boosting a friction force generated between the friction surface and the friction pad, on the basis of the friction force.

Abstract: In an electric motor brake, a friction disc includes an anti-rattle portion integrally molded therewith and reducing the tolerance gap between the motor shaft hub and the friction disc to minimize rattling of the friction disc during rotation of the shaft, and eliminating the need for a separate anti-rattle spring. In a first embodiment, the friction disc has a cavity at the inner circumference thereof facing the hub, and a cantilever finger extending into the cavity and engaging the hub and providing a cantilever bias urging engagement of the hub and friction disc. In a second embodiment, a bump on a slotted inner circumference of the friction disc provides the biasing portion, or may be spaced from the hub by a nominal clearance.

Abstract: A vehicle braking system having a brake rotor (10) and brake pedal-actuated hydraulic piston (24) that actuates a brake caliper (22) to engage a friction brake (25a, 25b) with the rotor (10) and further having a brake caliper retractor mechanism (40) including an actuator (46) for actively controlling retraction of the caliper (22) relative to the rotor (10) to provide either a friction brake force versus pedal brake force curve where the friction brake initially contacts the rotor (10) such that braking force from the brake pedal P begins at zero pedal force or a friction brake force versus pedal brake force curve that is displaced relative thereto where the friction brake initially is positioned out of contact with the rotor (10) such that braking force from the brake pedal begins at a finite preselected pedal force greater than zero.

Abstract: An open-topped disc brake comprises a disk and friction pads provided on opposite sides of the disk and having back plates. A caliper having a window and fluid pressure cylinders are provided together with pad pins extending across the window for supporting the friction pads. Pistons slidably received in the fluid pressure cylinders urge the friction pads against the disk. First and second shims are disposed between the friction pads. The first shims are provided near the friction pads with first claws provided on the first shims which resiliently embrace the back plates of the pads by straddling outer and inner edges of the back plates. Second shims are provided near the pistons with third claws provided on the second shims to detachably and resiliently engage the pistons. Second claws are provided on one of the first shims and the second shims for resiliently gripping the other of the first shims and the second shims so that the first and second shims are moved together.

Abstract: A disc brake for a bicycle includes a casing having a recess and a through hole defined therein. The through hole communicates with the recess. A rotating block having to cams is received in the through hole of the casing and has a shaft partially extending through the casing. A press block is received in the through hole of the casing and has one side abutting the rotating block. A push rod is mounted between the rotating block and the press block. One of two brake pads is attached to one side of the recess of the casing and the other is aligned with and attached to the facing side of the press block. The two brake pads face each other. The two brake pads clamp a disc that is mounted on a wheel of a bicycle when the shaft of the rotating block is rotated by the lever.

Abstract: A disc brake caliper including a brake piston movably arranged therein. The brake piston is sealed in relation to the brake cylinder by a sealing ring, which is arranged in a circumferential annular groove of the brake cylinder. The sealing ring functions to retract the brake piston in the brake cylinder after a braking operation in order to provide a clearance between a brake shoe and a brake disc. According to the present invention, the annular groove includes a recess, which is arranged in the area of transition between a groove wall and the cylinder surface . The contour line, which defines the cross-section of the recess, starting from the groove wall of the annular groove, passes from a convexly curved portion over into a concavely curved portion. This permits ensuring an unchangingly constant clearance between the brake shoe and the brake disc roughly irrespective of the hydraulic pressure.

Abstract: It is an object to obtain an air disc brake in which reduction in size, in weight, and in cost can be attained, and the responsibility can be improved easily. A pair of leg portions 15a in opposition to each other so as to put therebetween a rotor 3 are provided in a caliper body 15 fixed to a truck frame 7, a pair of brake blocks 14 disposed in opposition to each other so as to put therebetween the rotor 3 are attached to air chambers 17 built in the leg portions 15a respectively, each of the air chambers 17 includes a diaphragm 27 which is displacable to the rotor 3 side by a supplied air pressure, a piston 29 having a base end in contact with the diaphragm 27 and a tip end connected to the brake block 14, and a return spring 31 for urging the piston 29 to move apart from the rotor 3.

Abstract: The invention involves a spring for a floating caliper disc brake with a frame jaw caliper which, in the middle section of its axial outer edge, has a side window and on both sides of this window openings for an axial bracket of a fixed brake anchor plate. The caliper is displaceably and axially mounted on the bracket of the brake anchor plate. Brake linings are attached on both sides of the disc brake to the bracket of the brake anchor plate in an axial, displaceable manner and are also overlapped by the frame jaw caliper. The invention includes a onepiece curved wire holding spring, the middle section of which is releasably attached to the axial outer brake lining and which has two springs arms that are essentially placed in a contrary tangential direction to the middle section. The holding spring biases the frame jaw caliper radially against the brake anchor plate and biases the axial outer brake lining axially against the inside of the outer edge of the frame jaw caliper.