Abstract: Pneumatic brake booster (10) for a motor vehicle, comprising a moving internal partition (14) provided with a cup (38) covered by a sealing diaphragm (42) connected to the inner periphery of the casing (12), of the type in which the booster (10) is intended to be fastened to a bulkhead (34) of an associated vehicle by means of tie rods (24) of axial orientation passing through the casing (12) of the booster (10) and through the moving partition (14), and of the type in which the cup (38) has an aperture (46) associated with each tie rod (24) that accommodates a sealing ring (48) which is, on the one hand, fastened to the cup (38) and which is, on the other hand, slideably mounted on the associated tie rod (24), characterized in that the cup (38) comprises a tubular element (50) which contains the aperture and which extends at least axially in part around the sealing ring (48).

Abstract: A parking brake for a vehicle, including a parking brake unit, an actuating device situated inside the vehicle and operable to transmit an actuation signal to a control unit, a hydraulic circuit of a service brake of the vehicle connected to the parking brake unit, and an actuator and locking device for locking the parking brake in a braking position; the parking brake is actuatable by means of the hydraulic circuit and the actuator is a brake booster of the service brake.

Abstract: Pneumatic brake booster (10) for a motor vehicle, comprising a moving internal partition (14) provided with a cup (38) covered by a sealing diaphragm (42) connected to the inner periphery of the casing (12), of the type in which the booster (10) is intended to be fastened to a bulkhead (34) of an associated vehicle by means of tie rods (24) of axial orientation passing through the casing (12) of the booster (10) and through the moving partition (14), and of the type in which the cup (38) has an aperture (46) associated with each tie rod (24) that accommodates a sealing ring (48) which is, on the one hand, fastened to the cup (38) and which is, on the other hand, slideably mounted on the associated tie rod (24), characterized in that the cup (38) comprises a tubular element (50) which contains the aperture and which extends at least axially in part around the sealing ring (48).

Abstract: A parking brake for a vehicle, including a parking brake unit, an actuating device situated inside the vehicle and operable to transmit an actuation signal to a control unit, a hydraulic circuit of a service brake of the vehicle connected to the parking brake unit, and an actuator and locking device for locking the parking brake in a braking position; the parking brake is actuatable by means of the hydraulic circuit and the actuator is a brake booster of the service brake.

Abstract: A parking brake for a vehicle, including a parking brake unit, a drive unit, an actuating device situated between the parking brake unit and the drive unit, which actuating device is drivable by the drive unit and actuates the parking brake unit, and a mechanical locking device situated between the drive unit and the actuating device, which locking device, when a drive torque is interrupted, automatically locks the actuating device in order to mechanically lock the parking brake unit in a braking position; the locking occurs by means of a counteracting torque, which acts on the locking device after the interruption of the drive torque.

Abstract: The subject of the present invention is a pneumatic brake booster comprising an envelope in which a skirt (2) slides in a sealed manner, a pneumatic piston (8) rigidly attached to the skirt, a three-way valve (20) actuated by a control rod (22) operated at a first end by a pedal, a plunger (32) mounted at a second longitudinal end which is the opposite end and slideably mounted in the body of the piston, the control rod and the plunger forming a brake control (33), characterized in that the said booster comprises means (68) of damping the relative and in particular oscillatory movement between the brake control (33) and the pneumatic piston (8).

Abstract: A master cylinder and booster device for a motor vehicle braking system, in which the master cylinder (10) and the booster (12) are assembled to form a one-piece entity comprising a small reservoir (20) of brake fluid mounted on the master cylinder (10) and connected by a flexible duct (22) to a separate brake fluid reservoir (24) secured temporarily to the entity (10 12) for the purposes of delivering it to a motor vehicle manufacturer.

Abstract: The subject of the present invention is a pneumatic brake booster comprising an envelope in which a skirt (2) slides in a sealed manner, a pneumatic piston (8) rigidly attached to the skirt, a three-way valve (20) actuated by a control rod (22) operated at a first end by a pedal, a plunger (32) mounted at a second longitudinal end which is the opposite end and slideably mounted in the body of the piston, the control rod and the plunger forming a brake control (33), characterized in that the said booster comprises means (68) of damping the relative and in particular oscillatory movement between the brake control (33) and the pneumatic piston (8).

Abstract: A master cylinder and booster device for a motor vehicle braking system, in which the master cylinder (10) and the booster (12) are assembled to form a one-piece entity comprising a small reservoir (20) of brake fluid mounted on the master cylinder (10) and connected by a flexible duct (22) to a separate brake fluid reservoir (24) secured temporarily to the entity (10-12) for the purposes of delivering it to a motor vehicle manufacturer.

Abstract: A servomotor for an assisted braking of a motor vehicle comprises a rear wall (20) in which an axial cylindrical shaft (48) is formed, an intermediate part of which exhibits an inner shoulder (56) limiting the axial rearward motion of the piston (28) and capable of resisting a pulling force exerted on the control rod (12) driven by the brake pedal.

Abstract: This invention mainly relates to a pneumatic servomotor for an assisted braking, which reduces the noise in the passenger space to the minimum, while not requiring much room in the engine compartment, and it also relates to a motor vehicle equipped with such servomotor.

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 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.

Abstract: A force transmission and amplification device for a brake system comprising a pedal (1) and an output rod (2) for transmitting by way of the output rod (2) an output force (F2) having a higher intensity than an input force (F1) applied to pedal (1). An input rod (3) is secured to the pedal (1) for supplying a primary piston (4) located in a first diameter (D1) of primary cylinder (5) to delimit a primary chamber (51) retaining a fluid. A second piston (6) secured to the output rod (2) is located in a second diameter (D2) of a second cylinder (7) to delimit a secondary chamber (71). The primary chamber (51) is connected to the secondary chamber (71) to immediately supply pressurized fluid which acts on the second piston (6) to develop the output force (F2).

Abstract: A hydraulic-reaction master cylinder (2) having a working chamber (12) in which slides a hollow main piston (13) with a bore (130) therein which retains a reaction piston (14) to define a reaction chamber (15). The reaction chamber (15) has an annular shape and communicates with the working chamber (12) through at least one non-return valve (22) or an axial passage (23). The axial passage (23) is closed off selectively an axial stub (141) that extends from the reaction piston (14).

Abstract: A braking device having a flange (21) of master cylinder (2) secured to a pneumatic booster (1) by a nut (3) screwed onto a through-bolt (13) that extends through a front shell (111) and a rear shell (112). The through-bolt (13) has a threaded front end (131) and a shoulder (132) for holding a front wall (111) in alignment with the master cylinder (2). The nut (3) has a barrel engaged in a hole (211) in the flange (21) and is screwed onto the front end (131). A collar (32) on the nut (3) acts on the flange (21) to press the flange (21) against the front shell (111). The barrel (31) of the nut and shoulder (132) of the through-bolt (13) have first and second respective sections (S1, S2) which face each which engage the front shell (111) with the first section (S1) being larger than the second section (S2) such that the front shell (111) crumples on receipt of a impact force.

Abstract: A pneumatic booster operated by a plunger (8) located in a piston (5) with a rear section (82) which operates a valve (91,92,93) to develop a force on the piston (5) to apply a boost force to force-transmission members (12,14). The plunger (8) has a first section (81) connected to the rear section (82) by a spring (15). The front section (81) and the force-transmission members (12,14) defining a retention assembly (16,17) for securing the front section (81) to the piston (5) when a boost force exceeds a predetermined threshold while the plunger (8) is in a maximum actuating position to allow for extended actuation of the booster following a sharp braking action.

Abstract: A device for the quick assembly and disassembly of an input rod (1) for operating a brake system and a brake pedal. A clasp (3) is secured to the input rod (1) connecting a spindle (4) fixed to the brake pedal. The clasp (3) has a guide yoke (31) which receives a retaining yoke (32) and blocking members (51,61) which maintain the retaining yoke (32) in a closed configuration with respect to the guide yoke (31). The blocking member comprise at least one lug (51) borne by the retaining yoke (32) which projects toward the guide yoke (31) and opening (61) in the guide yoke (31) which receives the lug (51) with the clasp (3) in moved to a closed configuration. On movement of the clasp (3) toward a closed configuration, parallel cheeks (325,326) of retaining yoke (31) which are squeezed together elastically expand when lug (51) enters opening (61) to lock the clasp (3) in the closed configuration.

Abstract: The invention relates to a master cylinder with hydraulic reaction for a pneumatic brake booster, comprising a main piston (12) receiving a boost force, and a reaction piston (3), mounted so that it can slide in a reaction chamber (4) of the main piston and receiving an actuating force. The master cylinder of the invention also comprises a seat support (7) against which the reaction piston (3) can press and which is mounted so that it can slide towards a low-pressure chamber, the reaction piston (3) and this seat support in combination constituting a stepped assembly in the reaction chamber (3) capable of receiving, from the pressure in the reaction chamber (3), a force which combines with the braking effort after a sharp application of the brakes.

Abstract: A braking device having a pneumatic booster (2) having a rigid casing (3) defined by a front shell (31) and a rear shell (32). The interior of the rigid casing (3) being separated into a front chanber (33) and a rear chamber (34) by a movable partition (5). The booster (2) is reinforced by a strut (4) with a screw (40) which passes through the front shell (31), movable partition (5) and rear shell (32). The screw (40) has front end (41) and a rear end (42) separated from an intermediate cylindrical section (43). A sleeve (7) which extends from the rear shell (32) receives the second end (42) of the screw (40) and allows the screw (40) to axially slide with respect to the rear shell (32). A stop (61) on the intermediate section (43) prevents the second end (42) from projecting from the rear shell (32) until the first end (41) is rotated into engages the front shell (31) and threads on the second end engage corresponding threads on a support (1) to fix the booster (2) to the support (1).