Abstract: A disk brake for use in a vehicle. The disk brake has a caliper (1) which straddles a disk (2) and a carrier (3) which is fixed to a stationary member on the vehicle. A cylinder (4) secured to the caliper (1) has a bore (4a) which is closed by a piston (50). The carrier (3) has at least one guide pin (6,7) which extends into a blind bore (8,9) in the caliper (1). On communication of hydraulic fluid to bore (4a) the piston (5) and caliper (1) respectively move friction pads (10,11) into engagement with the disk (2) to effect a brake application. The guide pin (6,7) and blind bore (8,9) are defined with respect to the cylinder (4) such on movement of the cylinder by the hydraulic fluid to effect the brake application, air is compressed between the end (6a,7a) of the guide pin (6,7) and the bottom (8p,9p) of the blind bore (8,9). On termination of the brake application, the compressed air expands to move the caliper (1) to a rest position.

Abstract: This boosted braking device comprises a pneumatic brake booster (1) associated with a master cylinder (2) and provided with an automatic control solenoid valve (26), this booster operating according to a mixed reaction principle and comprising a movable pneumatic piston (5) carrying a control valve (7) actuated by a rod (8), as well as a partition (4) which can be moved under the effect of a pressure difference, this movable wall (4) being mounted slidingly with respect to the pneumatic piston (5). The device of the invention makes it possible, with very few elements, to provide automatic braking without disturbing the normal operation of the booster.

Abstract: A pneumatic servo for assisting braking. The servo has a casing with an axis of symmetry which is divided in leaktight fashion by a movable wall structure into a front chamber and a rear chamber. The front chamber is permanently connected to a source of partial vacuum while the rear chamber is connected selectively to the front chamber and to air in the surrounding environment by a three-way valve. A sleeve divided an annular bore located in a projection that extends through the movable wall through the casing into a static volume and a concentric annular volume. The sleeve engages the projection to position the three-way valve in the bore. A return spring located in the static volume engages the control rod while an end plug engages the sleeve to seal the static volume from the surrounding environment. The annular volume being is respectively connected by first and second openings to the surrounding environment and bore.

Abstract: A pneumatic brake booster having a casing (10) with an axis of symmetry (X-X') divided in a leaktight fashion by a moving wall structure (12) into a front chamber (14) and a rear chamber (12). The front chamber (14) is permanently connected to a source of low pressure and the rear chamber (12) is connected selectively to the front chamber (14) or to a source of high pressure by a three-way valve (36). The three-way valve (36) is actuated by a control rod (30) capable of bearing via a front face of a plunger (28) on a rear face of a push rod (48) secured to a reaction disk (49). The plunger (28) slides in a bore (26) of the moving wall structure (12) in response to an input force applied by an operator.

Abstract: A system for regulating pressure in a hydraulic circuit comprising at least one generator (110) of fluid under pressure, at least one reservoir (120) of fluid under low pressure and at least one pressure receiver (130, 130a, 130b). The system has least one solenoid valve with an electrical winding (18, 18a, 18b) and a moving magnetic core controlling the position of a distributor slide valve (16, 16a, 16b) which slides in a bore (14, 14a, 14b). Bore (14, 14a, 14b) communicates with a first duct (82) connected to the generator (110) of fluid under pressure, a second duct (12) connected to the pressure receiver (130, 130a, 130b) and a third duct (78) connected to the reservoir (120) of the fluid under low pressure. The system operates in response to a first type of control signal. (S1, S, Sa, Sb) derived from a plurality of inputs corresponding to the operation of a vehicle.

Abstract: An automatically controlled braking system comprising a pneumatic vacuum servo and a pneumatic solenoid valve capable of selectively connecting the serov to first or second sources of pressure. The solenoid valve includes a flap valve which is subjected to a suction force proportional to the difference between the first and second source of pressured and acts in the same direction as an electromagnetic actuating force. Elastic means act on and apply a greater force to the flap valve to oppose the suction force. A current generator supplies a current having a predetermined maximum intensity to the solenoid to develop an actuation force overcome the elastic force and effect actuation of the vacuum servo.

Abstract: A proportional solenoid valve for regulating pressure of fluid supplied to a system. The solenoid valve has high-pressure inlet (1), a low-pressure inlet (2) and an outlet (3) through which fluid under controlled pressure is supplied to the system. The solenoid valve has a body (4) with bore (5) therein for retaining a regulating slide valve (9). The regulating slide valve (9) is subjected to a pressure acting on a cross-section (S), to the force of a spring (10) and to a force exerted by an electromagnet (14,15). Movement of the slide valve brings about a communication between the high-pressure inlet (1) and the outlet (3) and communication between the low-pressure inlet (2) and the outlet (3) as a function of a control valve (16). The control valve (16) is located between the high-pressure inlet (1) and the outlet (3) and the high-pressure inlet (1) and low-pressure inlet (2) are isolated from one another by the slice valve (9) as long as said control valve is not open.

Abstract: An assembly of a pneumatic brake booster (100) and a master cylinder (200) for a motor vehicle. The pneumatic brake booster (100) has a casing (20) fixed to the bulkhead (10) of the vehicle. The casing is divided in leaktight fashion by a movable wall structure (22) into a front chamber (24) permanently connected to a source of partial vacuum and a rear chamber (26) connected selectively to the front chamber (24) or to the atmosphere by a valve means (16). The valve means (16) is actuated by a control rod (14) for actuating a push rod (28). The master cylinder (200) has a body (21) formed with at least first and second flanges (38, 38'; 40, 40'). The first and second flanges (38, 38'; 40, 40') interact with corresponding screws and nuts to fix the body (21) with the casing (20) of the booster (100). The body (21) has a bore (34) for slidingly receiving at least one piston (32) which is actuated by the push rod (28) of the brake booster (200).

Abstract: A drum brake including a carrier plate (10) on which there are slidably mounted first and second shoes (12, 14) capable of being brought into frictional engagement against an internal face of the drum (20) by a hydraulic actuation device (22). A variable-length strut (40) which, in interaction with a tension spring (30), determines the separation of the shoes (12, 14) and which is located in the vicinity of the hydraulic actuation device (22). A brace (100) is located on the web (14a) of the first shoe (14) and includes an active part (114) interposed retractable between the first end of the web (14a) of the first shoe (14) and one end (79) of the force-transmission actuation device (60, 70).

Abstract: A pneumatic servo for assisting with braking. The servo has a casing with an axis of symmetry and is divided in a leaktight fashion by a movable wall structure into a front chamber which is permanently connected to a source of partial vacuum and a rear chamber connected selectively to the front chamber or to the surrounding environment by a three-way valve. The three-way valve is actuated by a plunger which slides in a bore in the movable wall in response to an axial control rod. The control rod is subjected to the action of a return spring located in an annular space between the control rod and a tubular part on the rear of the wall structure which extends or projects through the casing. The three-way valve being located in this tubular part and includes a shutter element which interacts via a first annular surface with a first valve seat formed on the plunger and via a second annular surface with a second valve seat formed on the movable wall.

Abstract: This invention relates to a vehicle disk-brake and spring (40) through which a friction member (10) is attached to a torque-withstanding member (24). A support plate (12) is received via its circumferential ends (16, 18), which is anchored, and slides on the torque-withstanding member (24). At least one circumferential end (18) of the support plate (12) comprises of a rounded surface (22) interacting with the anchor and sliding with the rounded surface (32) defined on the torque-withstanding member (24). One of the rounded surfaces (32) is concave, and the other rounded surface (22) is convex with the radius of curvature of the convex surface (22) being less than the radius of curvature of the concave surface (32).

Abstract: A brake-application device having first (8) and second (9) plates, one of which rotates. A plurality of guide cavities (80, 81, 90, 91) are formed in at least one plate (8,9). A corresponding plurality of balls (10, 11, 12) located in the guide cavities (80, 81, 90, 91) are held between the first (8) and second (9) plates. A support disk (14) is placed between the first (8) and second (9) plates and pierced to define circular housing (140, 141, 142) for holding the balls (10, 11, 12) in a relative angular positions. First (148a) and second (149a) central protuberances, respectively, extend from first (148) and second (149) faces on the support disk (14) and are correspondingly located in axial bores (84) and (94) in the first (8) and second (9) plates to define a mechanical unit.

Abstract: A valve assembly having a body with a bore. The housing has an inlet for communicating pressurized fluid to the bore and an outlet for delivery of the fluid to a system. A piston located in the bore carries a valve element connected to a push rod. The push rod is mounted in the body and can retract into the body and open the valve element in a rest position of the valve to eliminate any shift between the inlet and outlet pressure when the pressure of the fluid is below a predetermined value.

Abstract: A disk brake having a caliper which slides on a stationary support formed by at least one axial guide pin for moving at least one friction pad against a rotating disk. A locking device which engages the stationary support to prevent the caliper from rotating about the axial guide pin. The locking device includes an axial spindle having a shank, a part of which slides in a bore formed in the stationary support, and a foot which forms a planar stop surface perpendicular to a central axis of the axial spindle. The foot engages a corresponding planar surface on the caliper. During assembly of the disk brake, the foot of the axial spindle interacts with a blocking member after passing through a mounting opening in the caliper to prevent rotation and axially center the spindle with respect to the stationary member.

Abstract: A sliding-caliper disk brake in which the pads (3) have lugs (31,32) function by bearing on a first side of a carrier and in traction on a second side. The braking forces which are exerted on the pad (3) in a central zone (30) make the pad (3) rotate about a fastening point (A) located on the first side while bearing (B) of the second side along a tangent (T) which forms an obtuse angle (G) with a straight line (D) which joins the fastening (A) and bearing (B) points, this angle being contained in the central zone (30) of the pad (3).

Abstract: A pneumatic servo for brake boosting intended for motor vehicles. The servo having a rigid casing divided into at least two chambers by a flexible membrane. The casing being composed of at least first and second elements and having at least two tie rods for joining the first and second elements together in an inward axial direction. The tie rods respond to any force which tends to move the first and second elements apart. At least one of the tie rods is compressible should an external force be applied to move the first element toward the second element to prevent communication of the external force through the second element into an operator compartment.

Abstract: A pneumatic brake booster having a casing (10) with a piston located therein. The piston has a hub (22,22') with a tubular part (24,24'), a portion of which extends in a sealed fashion through the casing (10). The hub (22,22') has an annular groove (29) which receives an internal peripherial bead (19) of a rolling seal (18) which holds a skirt (16) against a shoulder. The rolling seal (18) engages the casing (10) to define a front chamber (12) which is permanently connected to a source of depression and a back chamber (14) selectively connected to the front chamber (12) and to atmosphere via valve apparatus (22a,32a,36). The valve apparatus (22a,32a,36) is actuated by a control rod (34) capable of pressing, by way of a front face on a plunger (32), on a first face of reaction disk (40) secured to a second face on a push rod (42). The tubular part (24') of the piston is connected to the hub (22) by clipping.

Abstract: A module for controlling pressure in a hydraulic circuit, comprising at least one generator of pressurized fluid, at least one reservoir of low pressure fluid, and at least one pressure receiver. The module including a solenoid valve having an electric coil and a movable magnetic core plunger. The plunger being moved to controlling a position of a distributor slide valve which slides in a bore formed in a body. The bore communicating with a feed passage connected to the generator of pressurized fluid, a distribution passage connected to the pressure receiver, and a pressure relief passage connected to said reservoir of low pressure fluid. The module having a pressure controlled valve located between the generator and the feed passage.

Abstract: A mechanical adjuster for locating a piston within a body of a brake motor. A variable length spacer is located between the piston and a mechanical actuator. The spacer includes an elongated nut and a screw. The elongated nut is rotationally blocked by a pin in the body while the screw is rotated as a function of the linear movement of the piston to maintain a space relationship between friction members and a rotor.

Abstract: A pneumatic brake-booster having a casing with a piston located therein consisting of a hub and a skirt to define a front chamber and a rear chamber. The front chamber is connected permanently to a vacuum source and the rear chamber is connected selectively through a bore in the hub to one of the front chamber and atmosphere by a control valve. The control valve is actuated by a control rod capable of pressing through a front face of a plunger on a back face of a reaction disk fastened securely to a thrust rod. A return spring for the control rod is located between the piston and the plunger. The control valve includes a shutter valve which interacts with a first circular valve seat formed on the plunger and a second circular valve seat formed on the piston. The shutter valve is characterized by a flexible membrane having a first bead fixed in a leaktight manner to a peripheral edge of the hub and a second bead connected in a leaktight manner to an internal peripheral edge of a rigid tubular component.