Abstract: The invention relates to a vacuum-operated servo-brake comprising, in a casing consisting of a shell (10) and a cover (12), a piston (20) separating leaktightly two inner chambers (22, 24), a valve means controlled by a rod (32) projecting from the casing in order to ensure the operation of the servo-brake, and a prestressed spring (34) for returning the piston (20) to its rest position substantially abutting the cover (12), the spring (34) bearing on the shell (10). According to the invention, the spring (34) comprises a mechanism enabling its extension to be limited when the shell (10) and the cover (12) are not fixed to each other.

Abstract: The invention relates to a bleed valve for a hydraulic circuit, comprising a piston capable of sliding in a bore formed in a body and actuating a shutter arranged between two sub-circuits and movable between a first position, in which it allows communication between the two sub-circuits, and a second position, in which it prevents this communication, the shutter being movable under the effect of an external mechanical action exerted by an actuating member. According to the invention, the sealing between the bore and the outside of the body is ensured by the actuating member, and the shutter is movable under the effect of a difference between the pressures which are exerted on its two faces.

Abstract: The invention relates to a disc-brake motor subassembly comprising at least one piston (10), which can be controlled by a mechanical subassembly having first and second plates (40, 48), one of which is actuated in rotation, these two plates bearing mutually faced indentations (54, 56) in which is accommodated at least one ball (52), the indentations being provided in the axial direction of the plates with a slope which allows the conversion of the rotation of a first plate into axial displacement of the second plate in order to control the piston (10). According to the invention, in the course of the rotation the ball (52) follows a trajectory, the distance of each of the points of which from the axis of the plates (40, 48) is variable.

Abstract: The invention relates to a double brake booster for a motor vehicle, provided with a valve enabling the boost ratio to be varied as a function of the load of the vehicle. In addition to two pistons (64, 66) articulated to an arm (72), this valve comprises a pusher (80) driven by a third piston (68), to a first face of which is applied a first force representative of the load of the vehicle and to a second face of which is applied a second force of elastic nature, in opposition to the first, this third piston adopting, under the effect of the first and second forces, an equilibrium position which determines that of a variable bearing point for the lever which constitutes the arm (72). Moreover, the arm, the pusher and the three pistons are mounted in the same body, the arm and the pusher being housed in a single cavity (74) which is defined in this body and subjected to a low pressure, and toward which the second faces of the three pistons are turned.

Abstract: The disk-brake comprises a clevis (5), a sliding caliper (3) and an operating mechanism, the latter comprising a mechanism (19) having a wedge displaceable longitudinally between the caliper (3) and a piston, to move them apart, through the action of a pusher (21), which in turn is driven by the pushrod (25) of a drive mechanism (23). The drive mechanism (23) is fastened to the clevis (5) of the brake and the pusher (21) exerts on the wedge a force whose main component is parallel to the plane of the disk and directed in the predominant direction of rotation of the latter.

Abstract: The invention relates to a pneumatic brake-booster comprising a casing (10), inside which is situated a piston (22) consisting of a rear tubular part (22) which supports a skirt (14) and which with the aid of an unwinding diaphragm (12) defines a front chamber (16) permanently connected to a vacuum source and a rear chamber (18) selectively connected to the front chamber (16) or to the atmosphere by a valve mechanism (20a, 32a, 40) actuated by a control rod (34) adapted to bear, by way of a plunger (32) sliding in a bore (30) of the piston (20), against one face of a reaction disk (58) fastened to a push rod (56), the valve mechanism (20a, 32a, 40) comprising a valve closure member (40) cooperating with a first valve seat (32a) formed on the plunger (32) and with a second valve seat (20a) formed on the piston (20 ), a retaining member (50), for the plunger (32) disposed in a radial space (38) in the piston (20) and having an inner end region extending the bore (30) of the piston (20) and forming a stop surfac

Abstract: The invention relates to a pneumatic brake-booster comprising a casing (10), inside which is situated a piston (20) consisting of a rear tubular part (22) which supports a skirt (14) and which with the aid of an unwinding diaphragm (12) defines a front chamber (16) permanently connected to a vacuum source and a rear chamber (18) selectively connected to the front chamber (16) or to the atmosphere by a valve mechanism (20a,32a, 40) actuated by a control rod (34) adapted to bear, by way of a plunger (32), against one face of a reaction disk (58) fastened to a push rod (56), the valve mechanism (20a, 32a, 40) comprising a valve closure member (40) cooperating with a first valve seat (32a) formed on the plunger (32) and with a second valve seat (20a) formed on the piston (20). According to the invention, the plunger (32) and the piston ( 20) are provided with a second valve mechanism (65, 70).

Abstract: The invention relates to automatic braking device for a vehicle equipped with at least one fluid circuit connecting a master cylinder (10) to an application circuit including at least one brake motor (22) and comprising in addition a pump (30) capable of supplying to said application circuit via a non-return valve (31) fluid under high pressure taken from a low pressure reservoir (28).

Abstract: The invention relates to a pneumatic brake booster comprising a casing (10), within which is located a piston (22, 14, 102) formed from a rear tubular part (22) supporting a skirt and which, by way of an unrolling diaphragm (12), defining a front chamber (16) connected permanently to a vacuum source and a rear chamber (18) connected selectively to the front chamber (16) or to the atmosphere by a valve mechanism (136, 138, 140) actuated by a control rod (34) capable of bearing, by way of the front face (32b) of a plunger (32), on the rear face (58a) of a reaction disk (58) fixed to a push rod (56), a spring (150) for the return of the control rod (34) being arranged between the skirt (14) of the piston and the plunger (32), the valve mechanism (136, 138, 140) comprising a shutter (138) made rigid by an insert (118) and interacting by an active part with a first valve seat (136) formed on the plunger (32) and with a second valve seat (140) formed on the piston (14), the shutter (138) being formed by a flexible

Abstract: The invention relates to a pneumatic brakebooster possessing a casing (10), within which is located a piston (22, 14, 102) formed from a rear tubular part (22) supporting a skirt (14) and, with the aid of an unrolling diaphragm (12), defining a front chamber (16) connected permanently to a vacuum source and a rear chamber (18) connected selectively to the front chamber (16) or to the atmosphere by a valve mechanism (136, 138, 140) actuated by a control rod (34) capable of bearing by way of a plunger (32) on one of the faces of a reaction disk (58) fixed to a push rod (56), a return spring (150) for the control rod (34) being arranged between the skirt (14) of the piston and the plunger (32), the valve mechanism (136, 138, 140) possessing a shutter (138) interacting by an active part made rigid by an insert (118) with a first valve seat (136) formed on the plunger (32) and with a second valve seat (140) formed on the piston (14), the shutter (138) being formed by a flexible tubular diaphragm (114), the active

Abstract: The invention relates to a pressure-regulating device for a hydraulic circuit comprising at least one generator (30) of pressurized fluid, a hydraulic motor (28) and a reservoir (32) of fluid under low pressure, and including an electrovalve controlled by a calculator and comprising, in a yoke (8), an electric coil (10) and a sliding magnetic core (12) controlling a slider (16) sliding in a bore provided in a body (18), the slider (16) defining two chambers (22, 36) arranged on either side of the slider (16) in the bore, the slider comprising a hydraulic enclosure (40) communicating with the hydraulic motor (28) and defining a reaction force supplementing the force generated by the coil (10), counter to a prestressed resilient mechanism (20), the enclosure (40) consisting of a blind bore made in the slider (16), a needle (42) closing the enclosure (40) in a substantially leaktight manner, while a radial pierced hole (44) connects it to a groove ( 34) provided at the periphery of the slider (16).

Abstract: The invention relates to a pneumatic brake booster comprising a casing (10), within which is located a piston (22, 14, 102) formed from a rear tubular part (22) supporting a skirt (14) and, by way of an unrolling diaphragm (12), defining a front chamber (16) connected permanently to a vacuum source and a rear chamber (18) connected selectively to the front chamber (16) or to the atmosphere by a valve mechanism (136, 138, 140) actuated by a control rod (34) capable of bearing by way of a plunger (32) on one of the faces of a reaction disk (58) fixed to a push rod (56), the valve mechanism (136, 138, 140) possessing a shutter (138) made rigid by an insert (118) and interacting by an active part with a first valve seat (136) formed on the plunger (32) and with a second valve seat (140) formed on the piston (14), the shutter (138) being formed by a flexible tubular diaphragm (114), the active part of the shutter (138) being located between the two ends (112, 116) of the flexible tubular diaphragm (114), a stop me

Abstract: An automatic braking device for a vehicle equipped with at least one fluid circuit connecting a master cylinder (10) to a consumer circuit including at least one brake motor and possessing, furthermore, a pump (30) capable of delivering to the consumer circuit, via a non-return valve (31), fluid under high pressure taken from the master cylinder (10) comprises, in combination, a proportional solenoid valve connected to the consumer circuit and having a regulating outlet (20), during operation in the solenoid valve regulating the pressure of the fluid in the consumer circuit in relation to that of the fluid in the feed circuit of the pump, and a regulating slide (16) arranged between the master cylinder and the feed circuit of the pump in order to regulate the pressure of the fluid in the latter circuit and determine a reference pressure for the solenoid valve.

Abstract: The present invention relates to a device for the assembly and disassembly of a first pair (12) and of a second part (10), the first part (12) being securely attached to a first member (14) co-operating with a second member (22) retaining the second part (10) on the first (12). According to the invention, the first member (14) is a stud formed of a shank (16) and of a head (18) and the second member (22) is composed of a sleeve (24) in which slides a piston (26).

Abstract: The invention relates to a device for measuring the position of a push rod (30) of a pneumatic booster consisting of a housing (10) divided into a front chamber (20) and a rear chamber (22) by way of a moveable wall (18) returned to its rest position by a restoring spring (34), the booster actuating a piston (84) of a master cylinder (86) by means of the push rod (30), the measuring device comprising a first part (40) stationary relative to the housing (10) of the booster and a moveable second part (60), the first part (40) and second part (60) carrying electrical contacts (46, 46', 48, 48', 84; 76, 78).According to the invention, the first part (40) and second part (60) are cylindrical and coaxial, and they are arranged round the push rod.

Abstract: The invention relates to a disc-brake with a caliper (2) slidably mounted on a stationary support (1), comprising two friction pads, (4, 5) anchorably and slidably received in the stationary support (1) and capable of frictionally engaging with the opposite faces of a revolving disc (3) upon application of a brake (8), an axial column (10), integral with the stationary support (1) and slidably received in a corresponding bore (11) formed in the caliper (2), and a mechanism (20) for locking the caliper (2) in rotation about the column (10) on the stationary support (1). The mechanism (20) for locking the caliper (2) on the stationary support (1) is of the ball joint type so as to permit a disalignment of the caliper (2) with respect to the stationary support (1) upon actuation of the brake motor (8).

Abstract: The invention relates to a pneumatic brake-booster comprising a casing (10), inside which is situated a movable wall (12, 14) returned to a rear position of rest by a resilient mechanism and defining a front chamber (16) permanently connected to a vacuum source (61) and a rear chamber (18) selectively connected to the front chamber (16) or to the atmosphere by a valve mechanism (20a, 32a, 40) actuated by a control rod (34) adapted to bear, by way of a plunger (32), against one face of a reaction disk (58) fastened to a push rod (56). According to the invention, the resilient mechanism returning the movable wall (12, 14) to its rear position of rest exerts a modulable force on the movable wall (12, 14).

Abstract: A hydraulically controlled brake system for a motor vehicle, comprising a master cylinder, a corrector intended for reducing the pressure prevailing in the rear-wheel brakes in relation to that prevailing in the front wheels, and a wheel anti-lock device. The corrector is of the type with a controlled shift of the cut-off point. During the operation of the anti-lock device, the cut-off point has a specific value higher than that of a corrector equipping the vehicle without a wheel anti-lock device, while it is substantially equal to the latter in the event of a failure of the device.

Abstract: The invention relates to a drain plug for a hydraulic circuit, comprising, in a body (22), a shut-off element (40) permitting or preventing the communication between two subcircuits (I, II). According to the invention, it comprises at least one second shut-off element (56) permitting or preventing the communication between at least one of the two subcircuits (I, II) with at least a third subcircuit (III).

Abstract: The invention relates to a hydraulic assembly for conversion of a pressure of a brake fluid at least partially controlled by the load of the vehicle and arranged between a master cylinder and at least one brake actuator. The assembly comprises a conventional braking compensator controlled by the load of the vehicle and a pressure limiter.