Abstract: The invention relates to a brake booster with a short actuating travel, in which booster the three-way valve has a moving valve seat borne by a sleeve (54). The movement of this sleeve is controlled by the piston. The invention provides a device that comprises a face (100) that is inclined with respect to the axis of the sleeve in order to allow the sleeve (54) to move gradually.

Abstract: The invention relates to a brake booster with a short operating travel, in which the three-way valve comprises a mobile valve seat borne by a sleeve (54). The movement of this sleeve is controlled by the piston. According to the invention, there is an elastic device (70) applying force to the sleeve (54) in the direction of the front of the booster, and tending to move this sleeve forward with respect to the pneumatic piston (12). In addition, there is a device for transmitting the pressure of the master cylinder (120) to the sleeve (54) and that tends to apply a rearward force to the sleeve (54).

Abstract: The invention relates to a brake booster with a short actuating travel, in which booster the three-way valve has a moving valve seat borne by a sleeve (54). The movement of this sleeve is controlled by the piston. The invention provides a device that comprises a face (100) that is inclined with respect to the axis of the sleeve in order to allow the sleeve (54) to move gradually.

Abstract: The invention relates to a brake booster with a short operating travel, in which the three-way valve comprises a mobile valve seat borne by a sleeve (54). The movement of this sleeve is controlled by the piston. According to the invention, there is an elastic device (70) applying force to the sleeve (54) in the direction of the front of the booster, and tending to move this sleeve forward with respect to the pneumatic piston (12). In addition, there is a device for transmitting the pressure of the master cylinder (120) to the sleeve (54) and that tends to apply a rearward force to the sleeve (54).

Abstract: A pneumatic brake booster with short actuating travel, comprising a skirt and a pneumatic piston that are rigidly connected and slideably mounted in a sealed casing to delimit a low-pressure chamber and a variable-pressure chamber and a three-way valve arrangement that is controlled by a control rod connected at a first end to a brake pedal. The three-way valve arrangement having first and second valve seats and a valve that is applied to at least one of the first and second valve seats by a valve spring. The second valve seat being borne by a first longitudinal end of a plunger distributor while the first valve seat is borne by a first longitudinal end of a bushing slideably mounted in a sealed manner in the pneumatic piston over a defined first travel and beyond the defined travel the bushing is secured axially to the pneumatic piston.

Abstract: A pneumatic brake booster with short actuating travel, comprising a skirt and a pneumatic piston that are rigidly connected and slideably mounted in a sealed casing to delimit a low-pressure chamber and a variable-pressure chamber and a three-way valve arrangement that is controlled by a control rod connected at a first end to a brake pedal. The three-way valve arrangement having first and second valve seats and a valve that is applied to at least one of the first and second valve seats by a valve spring. The second valve seat being borne by a first longitudinal end of a plunger distributor while the first valve seat is borne by a first longitudinal end of a bushing slideably mounted in a sealed manner in the pneumatic piston over a defined first travel and beyond the defined travel the bushing is secured axially to the pneumatic piston.

Abstract: A pedal box for a motor vehicle, comprising clutch (1), brake (2), and accelerator (3) pedals that are mounted to respectively rotate about a corresponding pivots (X1, X2, X3) between a rest position and a position of maximum actuation after passing through a multitude of intermediate positions. A link (4) located between the accelerator pedal (3) and the brake pedal (2) places the brake pedal (2) in an intermediate position or a rest position depending on whether or not the accelerator pedal (3) is in a rest position.

Abstract: A braking device for a motor vehicle, including a master cylinder (2) with a primary piston (3) subjected to an actuating force of an input force exerted by a manual operating member (4) and a boost force exerted by a booster (6) coupled to the manual operating member (4) and an emergency assist valve (VA). Valve (VA) comprises: a reaction piston (19) sliding in a bore (20) of the primary piston (3) and urged toward a position of rest by by an elastic return member (22); a rapid piston (32) having a cross section smaller than the reaction piston (19) and sliding in a sealed manner in a bore (31) of a bushing (30) in bore (200; and a ratio control (27) actuated by a plunger distributor (10) driven by the manual operating member (4). The elastic return member (22) is arranged outside of the primary piston (3) and a transmission element (T) is provided to transmit a return force of the elastic return member (22) to the reaction piston (19).

Abstract: The invention relates to a braking device, which mainly comprises a pneumatic servomotor (1) and a master cylinder (2), the servomotor comprising in particular a rigid casing (10), a moving partition wall (11), front and rear chambers (101, 102), and a pneumatic piston (12), and the master cylinder (2) comprising more particularly primary and secondary pistons (221, 222) defining primary and secondary pressure chambers (241, 242), and an actuating rod (23) which controls the primary piston (221).

Abstract: This invention relates to a braking device, comprising a master cylinder (1), which is attached to a pneumatic servomotor (2) for an assisted braking, in a tight manner.

Abstract: The invention relates to a pedal box for a motor vehicle, comprising clutch (1), brake (2), and accelerator (3) pedals, each of which is mounted to rotate about a corresponding pivot (X1, X2, X3) between a rest position and a position of maximum actuation, passing through a multitude of intermediate positions.

Abstract: A braking device, for a motor vehicle, comprising: a master cylinder (2), a primary piston (3) mounted to slide in the master cylinder, a manual-control member (4), a booster coupled to the manual-control member, an emergency assist valve (VA) comprising a reaction piston (17a) and a rapid piston (17b), and a ratio control (T) actuated by a plunger distributor (10) driven by the manual-control member (4). The reaction piston (17a) and the rapid piston (17b) form one and the same stepped piston (17) having a part (17a) of large cross section and a part (17b) of small cross section, the large-section part (17a) determining, with a first bore (18) of the primary piston (3), a variable-volume annular chamber (27).

Abstract: A braking device for a motor vehicle, including a master cylinder (2) with a primary piston (3) subjected to an actuating force of an input force exerted by a manual operating member (4) and a boost force exerted by a booster (6) coupled to the manual operating member (4) and an emergency assist valve (VA). Valve (VA) comprises: a reaction piston (19) sliding in a bore (20) of the primary piston (3) and urged toward a position of rest by by an elastic return member (22); a rapid piston (32) having a cross section smaller than the reaction piston (19) and sliding in a sealed manner in a bore (31) of a bushing (30) in bore (200; and a ratio control (27) actuated by a plunger distributor (10) driven by the manual operating member (4). The elastic return member (22) is arranged outside of the primary piston (3) and a transmission element (T) is provided to transmit a return force of the elastic return member (22) to the reaction piston (19).

Abstract: Braking device, for a motor vehicle, comprising: a master cylinder (2), a primary piston (3) mounted to slide in the master cylinder, a manual-control member (4), a booster coupled to the manual-control member, an emergency assist valve (VA) comprising a reaction piston (17a) and a rapid piston (17b), and a ratio control (T) actuated by a plunger distributor (10) driven by the manual-control member (4). The reaction piston (17a) and the rapid piston (17b) form one and the same stepped piston (17) having a part (17a) of large cross section and a part (17b) of small cross section, the large-section part (17a) determining, with a bore (18) of the primary piston (3), a variable-volume annular chamber (27).

Abstract: A master cylinder having a body (10) with a bore (12) therein in which slides at least a primary piston (20). The primary piston (20) has a compensation passage (58), which in a position of rest, places a pressure chamber (24) in communication with a reservoir (14). The communication between interrupted upon actuation of the master cylinder by a control rod (18) acting on a second piston (48) sliding in the bore (12). A first compression spring (28) and a second compression spring (42) urge the primary piston (20) and second spring (16) toward a rear position of rest. The preload force of the first compression spring (28) exceeding that of the second compression spring (16) such that the second piston (48) is the first to move in response to a force applied to the control rod (18). The rear position of rest for the primary piston (200 and second piston (48) is defined by a same stop (36) which is integral with the body (10) of the master cylinder.

Abstract: A master cylinder having a main piston (12) located in a main bore (110) of a body (11) to define a working chamber (13), a reaction piston (3) located in a stepped bore (120) of the main piston (12) to define a reaction chamber (4) with components to providing a hydraulic reaction to a pneumatic booster. The main piston (12) slides in the main bore (110) in response to a boost force to develop an actuation force while the reaction piston (3) slides in the stepped bore (120) in response as a function of the actuation force. A first shut-off seat (41) is located on a front face of the reaction piston (3) is located in the reaction chamber (4) while a second shut-off seat (42) located in the reaction chamber (4) is mounted on a seat support (7) carried by the main piston (12). A first spring (51) urges the reaction piston (3) in a direction most likely to move the first shut-off seat (41) away from the second shut-off seat (42).

Abstract: A boosted braking device for a motor vehicle having a master cylinder (200) and a pneumatic booster (100) operated by applying an input force to an operating rod (26). The booster (100) has a rigid casing (10) which is divided by a partition (16) into at least first (12) and second (14) leaktight chambers. The partition (16) is acted upon via a difference in pressure between the first (12) and second (14) chambers on the opening of a three-way valve (24) to allow pressurized fluid to be communicated to the second chamber (14). A main hydraulic piston (30) which is located in the master cylinder (200) has a hollow cylinder (32) which is in communication with an interior volume (V) of the master cylinder (200). A secondary hydraulic piston (34) slides in a leaktight fashion inside of the hollow cylinder (32).