Abstract: A braking servomotor (10) having a rigid casing (12) with a movable wall (14) location therein to define a front chamber (16) and a rear chamber (18). The movable wall (14) carries a piston (22) that slidably receives an actuating rod (28) for a master cylinder (36). A control rod (28) is sliding located in a bore inside a piston (22) and moved as a function of an input force. The control rod (28) has an end that bears against a plunger (46) that has a finger (52) that biases a reaction disk (32) located at the rear surface of the actuating rod (28) to transmit a reaction force from the actuating rod through the plunger to the control rod. The servomotor (10) is characterised by a unidirectional clutch device (56) that responds to a predetermined speed at which an input force is applied to the control rod (28) to lock the actuating rod in relation to the piston (22), independently, of the reaction disk (32), the plunger (22) and the control rod (28).

Abstract: An adjustment arrangement for a non-servo drum brake having a hydraulic actuator that engages a first web of a first brake shoe and a second web of a second brake shoe. The hydraulic actuator on receiving a hydraulic input develops an actuation force for moving the first and second brake shoes from a rest position into engagement with a rotatable member to effect a brake application. An extendible member, that is connected to the first web and the second web, is extendable to define a running clearance in a rest position between the first and second brake shoes and the rotatable member. A lever arm, that is mounted on the first web, engages the extendable member. A resilient member extends between the lever to the second web to urge the first and second webs into engagement with the hydraulic actuator. The lever arm pivots on the first web as the first web moves through the running clearance during a brake application.

Abstract: A hydraulic brake booster (12) for use in a brake system (10) having a first housing (100) with a first bore (102) separated from a second bore (104). The first bore (102) retains a power piston (118) and the second bore (104) retains a control valve arrangement (170). A push rod (30) of an input arrangement (49) is connected to the power piston (118) and linked to the control valve arrangement (170) by a lever arrangement (50). A second housing (200) encloses the control valve arrangement (170), lever arrangement (50) and a projection (117) that extends from the power piston (118) to define a cavity or relief chamber (202) having a permanent low pressure. The input arrangement (49) supplies the control valve arrangement (170) with an input force in response to a braking force applied to the push rod (30) to regulate the communication of pressurized supply fluid from the second bore (104).

Abstract: A pneumatic servomotor for providing an assisted braking of a motor vehicle. The servomotor includes a plunger arrangement with a unidirectional clutch device (56). The clutch device (56) has a coaxial sleeve (58) that slides on a plunger (46) and a substantially ring-shaped key (60) with a given clearance around the sleeve (58). The key (60) is driven by a moving piston (22) in response to a predetermined rate of speed being applied to a control rod (38) by an input force. The predetermined rate of speed causes the key (60) to rock and lock the sleeve (58) with respect to the piston (22) independently of the control rod (38). The unidirectional clutch device (56) comprises at least one locking transverse face (76) for engagement with the sleeve (58). The face (76) is axially directed rearwards from a front end of the sleeve (58) to form a stop for a peg (78) located on the key (60) that extends radially towards the sleeve (58) for axial indexing an end locking position for the sleeve (58).

Abstract: A brake system (10) having a brake booster (12) that is responsive to an operator brake input for providing a first input force to a master cylinder (13) to develop a first brake application and is responsive to a hydraulic input for providing a second input force to a master cylinder (13) to develop a second brake application. An electronic control unit (ECU) (40) receives first input signals from sensors (19) indicative of a speed for each wheel (14,14′,18,18′) in a brake system of the vehicle. The ECU (40) supplies a pump (42) with an operational input signal when a sensed wheel speed indicates a wheel lock may occur between a wheel and a surface during a brake application and simultaneous activates a decay valve (17) to release pressurized fluid from actuation of the wheel brake associated with the wheel.

Abstract: A guide pin (36,42) for caliper (16) of a disc brake assembly (10) having a first cylindrical body (102,202) having a first head (104,204) thereon secured to a second cylindrical body (112,212) having a second head (114,214) on a first end and a threaded section (116,216) that extends from a shoulder (120,220) to a second end. A resilient washer (110,210) is located between the second head (114,214) and an ear (38,44) on an actuation section (18) of the caliper (16).

Abstract: This invention relates to a resilient return having a fixing seat, and to an elongate body fitted with such resilient return. The resilient return, particularly a spring in accordance with the invention, comprise a seat (9) capable of fitting into a receiving cavity, made in at least one wall (10) of an elongate element (29), typically in the radially-inner face of the wall of a tubular element, of a sleeve or similar. The present invention mainly applies to the motor car industry and especially to the design and manufacturing of braking devices.

Abstract: An axially guiding and radially retaining spring (3) for a friction element (15) of a disk brake. The spring (3) includes a throat section (5) mounted by being snap-locking onto a protrusion (7) of a support member (9).

Abstract: A pneumatic servomotor (1) for an assisted braking having a housing, separated by a diaphragm (5) into a first variable-volume chamber (3) and a second variable volume chamber (7) therein. During a. brake application a force applied to a control rod (13) moves to allow a first flap (19) to isolate the second chamber (7) from the first chamber (3) and thereafter allow a second flap (23) to open and allow pressurized assist fluid to be communicated to the second chamber (7). The diaphragm (5) has a lip (35) thereon that engages the housing to define a thrust chamber (41). On opening of the second flap (19) allows the pressurized assist fluid is initially communicated to the thrust chamber (41) and only after a predetermined travel of the control rod (13) is the pressurized assist fluid communicated to the second chamber (7) for creating a pressure differential between the fluid in the first chamber (3) and second chamber (7) to develop an output force to effect a brake application.

Abstract: This invention relates to a housing for receiving a reaction disk in a pneumatic servomotor. The housing and reaction disk co-operate to resist too fast a forward travel of a piston when the brake is actuated and thereby avoid an undesired reopening of a passage connecting a front chamber with a rear chamber in a brake booster during a brake application. The reaction disk (39) is located in an inner space of the housing (47) that has a greater size than the volume of the disk (39). The disk (39) is initially deformed to completely fill the housing (47) by an input force corresponding to a desired brake application to limit the forward speed of the pneumatic piston and only thereafter as a reaction force develops during the brake application, does the reaction force balance the input force applied to the disk (39) during a brake application.

Abstract: A servobrake having a rigid jacket defined by a first shell joined to a second shell by through tie-bars to create variable volume front and rear chambers. The front chamber is permanently connected to a first pressure source whereas the rear chamber is selectively connected to the first pressure source and a second pressure source. The servobrake including a pressure sensor for the measurement of the pressure inside of the front and rear chambers. The pressure sensor is characterized by being attached to a front end of the through-tie bar whereas the tie-bar is characterized by a hollowed-out body with a hollow inner needle sealingly retained therein. The hollow inner needle defines a first chamber while a second chamber is defined by a space between the inner hollow needle and the hollowed-out body. The hollowed-out body has first ports therein for connecting the rear chamber with the first chamber through which pressure present in the rear chamber is transmitted to the pressure sensor.

Abstract: A pneumatic servobrake having a detector (13) for the measurement of the pressure in a front chamber (1). The detector (13) has a baseplate (14) that is situated opposite an opening (25) in a wall (26) of the front chamber (1). A yoke-forming cage (38) that is placed over the opening (25) has an opening (40) that is traversed by a pressure sampling tube (16). The tube has a collar (41) that is retained between the cage (38) and the baseplate (14). An adapter (23) connected to the wall (26) urges the tube (16) against the cage (38) to allow for both a sideways motion (20) and a tilting motion (21). The lower part (31) of the tube (16) is fitted with an O ring (33) to establish a sealed pneumatic connection between the tube (16) and baseplate (14) such that a first sensor (15) is isolated from a second sensor (48) in a measurement of pressure in the first chamber (1).

Abstract: In a process for manufacturing a master cylinder (23) wherein a piston (9) that carries a valve (37) is assembled within a cylinder to define a chamber (41).

Abstract: A boosted braking device for a motor vehicle having a master cylinder (M) and a pneumatic booster (S). The booster (S) has a rigid casting (10) divided by a mobile partition (12) into at least a front chamber (14) and a rear chamber (16). A three-way valve (18) carried by the mobile partition (12) is actuated by a control rod (20) to control the pressure in the rear chamber (16) for operating the master cylinder (M). The casing (10) includes a front shell (24) and a rear shell (26) each of which comprises a radial shoulder (28,30) and being secured together by hooping (40) interconnecting with the shoulders (28,30) of the front shell (24) and rear shell (26). The hooping (40) comprises first (40A) and second (40B) part hoops. The first (40A) and second (40B) part hoops are joined together by at least one locking element (50) which is rendered non-functional when the master cylinder (M) is subjected to substantial stress as a result of a frontal or oblique impact of the vehicle.