Abstract: The invention relates to a brake booster comprising a casing (10) and a flexible diaphragm (12) which sealingly divides the interior of the casing into a front chamber (16) and a rear chamber (18). According to the invention, it possesses at least one passage which extends sealingly through it from one face of the casing to the opposite face. The invention is utilized for the braking of motor vehicles.

Abstract: The invention relates to a process for the assembly, by crimping, of a cover (10) to a cylinder (12), in which the cylinder (12) has a rim (18) extending outwardly and the cover (10) has a border of which radial shoulder (14) is substantially parallel to the rim (18) and a cylindrical projection (16), in which a plurality of uniformly distributed oblong slots (22) has been made, is perpendicular to the rim which it surrounds. The cylinder (12) is fitted into the cover (10) after a deformable gasket (19) has been arranged between them and other components of the finished assembly have been enclosed, the cover (10) and cylinder (12) having previously been covered with a protective coating.

Abstract: The invention relates to a brake servomotor assembly (1) consisting of a front half-shell (6) and a rear half-shell (8) and mounted on a stationary part (4, 40) of a vehicle by means of lugs (54, 56, 154) arranged in a plane perpendicular to the axis of the servomotor and around this axis, extending radially outwards and cooperating with bearing surfaces (34, 36, 134) with corresponding shapes and dimensions for mounting by mechanism of axial engagement followed by rotation, an elastic means (25, 125) being arranged between the servomotor (1) and the stationary part (4,40), the servomotor (1) having a central hub (24) on the rear half-shell (8) comprising a control valve mechanism (26) of the servomotor (1). The lugs (154) or the bearing surfaces (34, 36) are formed as a single piece with the central hub (24) and cooperate respectively with the bearing surfaces (134) or the lugs (54, 56) formed on the stationary part (4, 40) of the vehicle.

Abstract: A rigid partition (18) internally delimiting a front space and a rear space in the outer casing (10) of a brake servo unit is fastened on an approximately cylindrical extension (14a) of a reinforcing plate (14) internally lining the front portion of the casing. A two-stage servo unit of simplified construction and of small dimensions, utilizable in the brake circuit of motor vehicles, is thus obtained.

Abstract: The present invention relates to a piston cap for a disc brake, comprising a brake motor consisting of a piston (24) sliding in a cylinder (26), this cap being composed of a flexible material ensuring sealing between the piston (24) and the cylinder (26) by way of a bead (32) located on its inner periphery and coming to rest in an annular groove (34) made in the head of the piston (2) and of a retention part on its outer periphery, capable of coming in contact with the inner wall of a receptacle formed at the end of the cylinder, this retention part comprising a metal insert (36) in the form of a cylindrical ring. According to the invention, the cap possesses at least one vent allowing the air contained in the volume which it delimits with the piston (24) and the cylinder (26) to escape and preventing the entry of foreign bodies or corrosive agents into this volume.

Abstract: In order to increase the efficiency of a booster (10), the rear chamber (18) of which contains an auxiliary drive member (28) having a pressure chamber (30) connected to a pressure source (34) via a control device (36), the latter comprises a normally closed valve (38), via which the source (34) can communicate with the pressure chamber (30), and a mechanism (40) actuating this valve, which controls the opening of the latter automatically when the pressure in the rear chamber (18) exceeds the pressure in the front chamber (16) of the booster by a given value. Such an assembly can be used particularly on a braking system of a motor vehicle.

Abstract: The invention relates to a braking device for a motor vehicle having a bulkhead (1) separating the passenger compartment (5) from the engine compartment (3). The device comprises a master cylinder (7) having a flange (13), via which it is fastened by means of a screw/nut assembly (15) to the front wall of a pneumatic brake booster (9) controlled as a result of the action on a tappet (11) passing through the rear wall of a brake booster, and a mechanism for fastening the device to the bulkhead (1) such that the brake booster (9) is arranged on the same side as the passenger compartment (5). The master cylinder (7) is partially arranged in the passenger compartment (5) and passes through an opening made in the bulkhead (1) for this purpose.

Abstract: The circuit comprises a first branch (35, 20, 21) and second branch (5, 8, 9) respectively controlling the feeding of brake fluid to a driving-wheel brake (100) and a non-driving wheel brake (101). An anti-lock device controls solenoid relief valves (21, 9) which interact with pilot-controlled valves (20, 8). A solenoid anti-skid valve (35) is connected to the first branch, downstream of the junction point (6) of the two branches with the master cylinder (1) in order to ensure the possibility of braking the non-driving wheel by way of the brake pedal (3) simultaneously with an anti-skid sequence or with an accidental triggering of the solenoid valve (35).

Abstract: Assembly of a servomotor (10), such as a brake booster sevomotor, on a motor-vehicle bulkhead is performed by fixing, on the rear side of the srvomotor and on the bulkhed, two pairs of plates (16a, 16b; 18a, 18b) which project towards each other and are parallel with each other and with the axis of the servomotor. These plates are rigidly joined together by at least one screw/nut assembly, the nut (24a, 24b) of which is welded onto one of the plates and the screws (26a, 26b) of which pass through the plates in a direction perpendicular to the axis of the servomotor, the plates being accessible from the outside. Advantageously, the plates (16a, 16b) connected to the servomotor have at least one coupling member (20a20b) designed to cooperate with notches (22a, 22b) formed on the top edge of the plates (18a19b) connected to the bulkhead, in order to allow positioning of the servomotor relative to the latter.

Abstract: The invention relates to a brake booster of the type for motor vehicles comprising a casing and a diaphragm which divides the interior of the casing (5) sealingly into a front chamber and a rear chamber, a hollow piston (10) movable in the casing, an input member (14, 16) intended to be connected to a brake pedal (18), an output assembly (20, 26) intended to be connected to a piston of a master cylinder, and a reaction disk (32) made of a deformable material and arranged between the hollow piston (10) and the output assembly (20, 26), in order to receive the output force of the booster when it is put into operation, the output force causing a first deformation of the reaction disk (32), this deformation tending to push back the input member (14, 16). According to the invention, the output assembly (20, 26) is formed in two parts, one movable relative to the other counter to a spring means (36), in order to act on a reduced surface of the reaction disk ( 32).

Abstract: The invention relates to an automatically adjustable spacer for a drum brake, comprising essentially a first part (10) bearing at one of its ends on a first shoe (3), a second part (16) bearing at the opposite end on the second shoe (2), the first and second parts (10, 16) being mounted slidably longitudinally relative to one another, a locking element (30), at least part of the periphery of which has a toothing, mounted movably on one of the first and second parts and capable of meshing with a corresponding toothing (28) provided opposite it on part of the periphery of the other of the first and second parts, so as to define a device for the automatic extension of the spacer as a function of the wear of the friction elements.

Abstract: The invention relates to a dual brake compensator for a motor vehicle, comprising two correcting valves, of which the inlets are intended to be connected separately to two independent brake-pressure sources and the outlets to two independent brake motors, each correcting valve being capable of controlling the values of the pressures at its inlet and at its outlet according to a predetermined relation and comprising a piston subjected to elastic return means by an inlet member. According to the invention, the dual corrector includes a mechanism for comparing the positions of the inlet members of each correcting valve.

Abstract: The spring comprises a mounting portion 42 snapped into the arch of the caliper of a sliding-caliper disc brake, and rigid portions 58, 60 for exerting forces on support plates 26, 28 of friction members interacting with the disc of the brake. According to the invention, slits 90, 92 parallel to the rigid portions 58, 60 reduce the rigidity of the central part of these. Thus, when the friction members become worn and approach the center of the spring, an intensification of the forces exerted on the support plates by the spring is avoided. A lug 100 makes it possible to keep the rigid portion 58 away from a fragile part of the brake when the friction members are removed from the latter. The invention is used on sliding-caliper disc brakes.

Abstract: The actuator (10) of a brake, such as a disc brake, is controlled by an electric motor (34) which drives a pump (38, 50, 62) ensuring that the pressure of the brake fluid in a control chamber (44) rises. A crankshaft (38) driven by the electric motor (34) imparts a to-and-fro movement to a plunger piston (50) in a pumping chamber (62). This chamber (62) communicates with a brake-fluid reservoir via an intake duct (74) controlled by way of a valve (76, 78) and with the chamber (44) via a delivery duct controlled by way of a valve (58, 60). Furthermore, the control chamber (44) communicates with the reservoir via a recycling duct (80) controlled by way of a solenoid valve (82). The entire hydraulic circuit so formed is accommodated in the body (12) of the actuator.

Abstract: The invention relates to a tandem hydraulic pressure transmitter device, particularly for a hydraulic circuit in a motor vehicle, comprising a first piston sliding sealingly in a first bore, adaptive to be operated by a first operating mechanism, and transmitting a first pressure to at least one pressure receiver, and a second piston sliding sealingly in a second bore, adapted to be operated by a second operating mechanism, and transmitting a second pressure to at least one other pressure receiver. According to the invention, the first and second pistons are returned to their positions of rest by the first and second operating mechanisms, respectively.

Abstract: The present invention relates to a disc brake for a motor vehicle, comprising an inner (12) and an outer (14) disc, fastened one to the other and with a fixed spacing (D), an outer pair and an inner pair of friction elements for coming into frictional engagement with the opposite faces of the two discs, and support (16) and control (42, 42') members intended for laying the friction elements against their respective disc, the brake comprising a supporting yoke (16) extending both on the inside of the inner disc (12), in the gap (D) between the two discs, and on the outside of the outer disc (14), an inner caliper, interacting with the inner pair (40i, 40e) of friction elements, and an outer caliper, interacting with the outer pair (40'i, 40'e) of friction elements, the two calipers (42, 42') being mounted slidably in the supporting yoke (16).

Abstract: The invention relates to a brake with at least one stationary disc (10) and one axially movable disc (33). The movable disc (33) is mounted on hangers (17), themselves each fixed to a cylindrical column (16) parallel to the axis of the wheel. This column can move axially on bearings (15) carried by an extension (8) of the hub. This extension is in the form of a fork, with two teeth set apart axially and located on either side of the plate (2) forming the body of the hub. Seals (22) make it possible to maintain a reserve of grease in the region of the bearings (15).

Abstract: In a brake booster comprising a control rod (30) actuating a booster mechanism (34, 20a, 28a) by way of a plunger (28), in order to exert a boosting force on a piston (20) acting on a push rod (46) via a reaction disc (48) made of a deformable material, an adjustable prestress is applied to the latter. This result can be obtained particularly by way of a cover (50) capping a plate (46b), formed at the rear end of the push rod, and the reaction disc (48). The prestress thus applied to the disc makes it possible to adjust the play existing between the latter and the front end of the plunger (28) and consequently the jump of the booster.

Abstract: The invention relates to a device for measuring the position of a movable member relative to a stationary member, the stationary member being one of the walls of a booster housing (14), and the movable member being a piston mechanism (16) dividing the housing into a front chamber and a rear chamber, comprising a movable first mechanism (42) which is movable together with the movable member (16) and the movement of which is detected in relation to a second mechanism (26) stationary relative to the stationary member (14). According to the invention, the stationary second mechanism (26) is fastened to the stationary member (14) outside the housing (14) of the booster, the movable first mechanism (42) sliding relative to the stationary second means (26), so as to vary at least one electrical quantity as a function of the position of the movable first mechanism (42) relative to the stationary second mechanism.

Abstract: The subject of the invention is a disc brake and support system for such a brake. The disc brake comprises a torque-supporting member (10), with which are associated actuation mechanism (26, 28) capable of urging at least one friction element (22, 24) against a rotating disc (18), the torque-supporting member being equipped with bores (32, 34) allowing it to slide respectively on a first column (12) located at the torque input and on a second column (14) located at the torque output in a direction substantially perpendicular to the plane of the rotating disc, these columns being fixed to a stationary support (16). According to the invention, the guide lengths of the torque-supporting member (10) on the first column (12) and on the second column (14), L and l respectively, are different. Also according to the invention, the play left between the first column (12) and the first bore (32) on the one hand and between the second column (14) and the second bore (34) on the other hand, J.sub.E and J.sub.