Abstract: Master cylinder of a hydraulic braking circuit, particularly for a motor vehicle, comprising a piston (2) sliding axially in a body (4) comprising an annular lip seal (51) produced by molding, and comprising an internal, dynamic sealing lip (14) surrounding the piston and connected by a curved surface (36) to a planar rear face (30) comprising radial passages which are defined by blocks formed as projections on the rear face of the seal, these blocks being separated from the curved surface (36).

Abstract: Master cylinder for a hydraulic braking circuit, particularly for a motor vehicle, comprising an annular seal (1) placed in a housing (6) of the body comprising an internal dynamic sealing lip (14) surrounding the piston, fitting into an annular groove (20) of the piston when this piston is in a rear rest position, an outer static sealing lip (10) pressing against a wall of the housing, and an additional static sealing lip (16) which presses against a wall of the housing of this seal and with the outer lip defines a small closed volume (V) of liquid.

Abstract: Actuator piston (100) formed by an injection-molded piece (120) consisting of a cylindrical body (121) and a collar (122) to receive the hydraulic actuator (110) and the travel detector (160). The piece (120) comprises a shell (150) covering its front face and receiving the return spring (250) and the thrust rod (130). The actuator piston (110) includes lugs (115) engaged behind the lugs (125) of the body (121), by a pivoting movement about the axis. The rotational position is blocked by a locking and guiding sleeve (180).

Abstract: Brake system comprising a thrust rod (130) driven by the servobrake (200) and actuating the piston (110) of the master cylinder (100), the servobrake (200) being linked by a hydraulic actuator (270) to the control rod (230) of the brake pedal (PF). The servobrake (200) comprises an actuator piston (220) controlled by an electric motor (265) via a rack drive (260). A simulator chamber (250) delimited by the hydraulic actuator (270) is subdivided by an intermediate piston (240) into a rear volume (V1) and a front volume (V2), respectively delimited by the intermediate piston (240). A duct (L1) links the rear volume (V1) to a duct (L2) linked to the front volume (V2) by a first solenoid valve (EV1) and the duct (L2) to the tank (115) by a second solenoid valve (EV2). The piston (240) is linked to the rod (130) bearing an abutment (132) to be thrust by the actuator piston (220).

Abstract: Braking system comprising a brake booster (200) with electric motor driving the push rod (130) of the piston of the master cylinder (100) via a ball-screw connection and actuated by a control rod (230). In the casing (201) connected to the master cylinder (100), the brake booster (200) comprises an actuator piston (220) guided in translational movement by at least two guide pins (311) which are parallel to the axis (XX) of the master cylinder (100) and which is driven in translational movement by a ball screw (225, 226) of which the screw (225), driven by the motor (210), is offset with respect to the axis (XX) of the master cylinder (100). The screw collaborates with a nut (226) translationally as one with the actuator piston (220), and a bore (221) of the actuator piston (220) receives a boost piston (250) equipped with a reaction disc (240) and with a plunger piston (232) connected to the control rod (230).

Abstract: The invention relates to a master cylinder (1) with reduced free travel (23). Current master cylinders have a free travel during the displacement of a piston (6) in a bore (5) of a master cylinder body (3). Such a free travel may be reduced with the aid of a frustoconical portion (24) in the piston, an orifice (14) for communication of hydraulic fluid being situated on said inclined wall, a gap (26) between the inclined wall and an inner wall (12) of the bore allowing a passage for hydraulic fluid capable of filling a pressure chamber (4). However, such inclined walls create a change in the slope of an outer wall (29) of the piston, this change being able to cause a separation of an inner lip (19) of a sealing cup (17). To prevent this separation, the invention provides that the inclined wall forms a convex rounded surface (32).

Abstract: A hydraulic braking assembly (14) for a vehicle comprising an electric servomotor (15), a master cylinder (16), a hydraulic fluid tank (17) mounted on the master cylinder, a hydraulic fluid level sensor (25) situated inside the fluid tank and monitoring the hydraulic fluid level inside the tank. The fluid level sensor is connected from the tank to the computer of the electric servomotor by a cable (26).

Abstract: Brake master cylinder (10) for a motor vehicle, of the type which comprises a substantially axial body (12) inside a bore (14) of which is slideably mounted at least one axial piston, of the type in which the bore (14) comprises two seals, front and rear, interposed between the piston and the bore (14), characterized in that it comprises at least one wide groove (66, 68) which is formed in the bore (14) in front of a groove (70, 72) for retaining the front seal, which extends at least in part around the piston, and which communicates with said retaining groove (70, 72) and the hole in the piston, in order to allow resupplies to occur with a high flow rate.

Abstract: Brake master cylinder (10) for a motor vehicle, of the type which comprises a substantially axial body (12) inside a bore (14) of which at least one axial piston is slideably mounted, of the type in which the bore (14) comprises two seals, front (30, 34) and rear, interposed between the piston and the bore (14), the seals (30, 34) comprising three radially concentric lips accommodated in grooves (70, 72) in the bore (14), characterized in that front faces of the grooves (70, 72) are configured at least in part as a slope.

Abstract: Brake master cylinder (10) for a motor vehicle, of the type which comprises a substantially axial body (12) inside a bore (14) of which at least one axial piston is slideably mounted, of the type in which the bore (14) comprises two seals, front (30, 34) and rear, interposed between the piston and the bore (14), the seals (30, 34) comprising three radially concentric lips accommodated in grooves (70, 72) in the bore (14), characterized in that the seals (30, 34) comprise central lips of reduced cross section.

Abstract: Brake installation consisting of a master cylinder associated with a brake booster furnished with a motor driving an actuator piston and acting on the primary piston of the master cylinder by means of a reaction disk against which the piston rests. For a safety operation, the hydraulic actuator connected to the control rod actuated by the brake pedal rests on the rear face of the reaction disk. The actuator piston is combined with an auxiliary piston in order to interact with the reaction disk and it is guided by its sleeve-shaped portion in a bore of the body of the brake booster. An adapting shim is supported by the auxiliary piston in order to receive as a support the end of a rear rod, secured to the primary piston of the master cylinder. The thickness of the assembly formed by the adapting shim and the auxiliary piston is defined on mounting of the master cylinder and of the brake booster as a function of the free travel measured previously.

Abstract: Master cylinder of a hydraulic braking circuit, particularly for a motor vehicle, comprising a piston (2) sliding axially in a body (4) comprising an annular lip seal (51) produced by molding, and comprising an internal, dynamic sealing lip (14) surrounding the piston and connected by a curved surface (36) to a planar rear face (30) comprising radial passages which are defined by blocks formed as projections on the rear face of the seal, these blocks being separated from the curved surface (36).

Abstract: Master cylinder for a hydraulic braking circuit, particularly for a motor vehicle, comprising an annular seal (1) placed in a housing (6) of the body comprising an internal dynamic sealing lip (14) surrounding the piston, fitting into an annular groove (20) of the piston when this piston is in a rear rest position, an outer static sealing lip (10) pressing against a wall of the housing, and an additional static sealing lip (16) which presses against a wall of the housing of this seal and with the outer lip defines a small closed volume (V) of liquid.

Abstract: The invention relates to a master cylinder (1) with reduced free travel (23). Current master cylinders have a free travel during the displacement of a piston (6) in a bore (5) of a master cylinder body (3). Such a free travel may be reduced with the aid of a frustoconical portion (24) in the piston, an orifice (14) for communication of hydraulic fluid being situated on said inclined wall, a gap (26) between the inclined wall and an inner wall (12) of the bore allowing a passage for hydraulic fluid capable of filling a pressure chamber (4). However, such inclined walls create a change in the slope of an outer wall (29) of the piston, this change being able to cause a separation of an inner lip (19) of a sealing cup (17). To prevent this separation, the invention provides that the inclined wall forms a convex rounded surface (32).

Abstract: Brake master cylinder (10) for a motor vehicle, of the type which comprises a substantially axial body (12) inside a bore (14) of which is slideably mounted at least one axial piston, of the type in which the bore (14) comprises two seals, front and rear, interposed between the piston and the bore (14), characterized in that it comprises at least one wide groove (66, 68) which is formed in the bore (14) in front of a groove (70, 72) for retaining the front seal, which extends at least in part around the piston, and which communicates with said retaining groove (70, 72) and the hole in the piston, in order to allow resupplies to occur with a high flow rate.

Abstract: Brake master cylinder (10) for a motor vehicle, of the type which comprises a substantially axial body (12) inside a bore (14) of which at least one axial piston is slideably mounted, of the type in which the bore (14) comprises two seals, front (30, 34) and rear, interposed between the piston and the bore (14), the seals (30, 34) comprising three radially concentric lips accommodated in grooves (70, 72) in the bore (14), characterized in that the seals (30, 34) comprise central lips of reduced cross section.

Abstract: Brake master cylinder (10) for a motor vehicle, of the type which comprises a substantially axial body (12) inside a bore (14) of which at least one axial piston is slideably mounted, of the type in which the bore (14) comprises two seals, front (30, 34) and rear, interposed between the piston and the bore (14), the seals (30, 34) comprising three radially concentric lips accommodated in grooves (70, 72) in the bore (14), characterized in that front faces of the grooves (70, 72) are configured at least in part as a slope.

Abstract: An arrangement (10) for the connection of a brake fluid supply reservoir (12) to a longitudinal brake master cylinder (14) of a motor vehicle, in which at least one lower supply pipe (16) connected to the reservoir is received in a complementary supply bore (18) of the master cylinder (14) and in which vertical immobilization structure (20) is interposed between the pipe (16) and the master cylinder (14). The arrangement is by an intermediate baseplate (22) that is connected to the reservoir (12) by at least one nozzle (24) including the supply pipe (16) and that is lowered vertically onto the master cylinder (14) and then immobilized on the master cylinder (14) by way of vertical immobilization structure (20) that directly snap-fastens to the master cylinder (14) to allow rapid attachment of the pipe (16) to the master cylinder (14).

Abstract: In order to prevent hydraulic fluid infiltrating out from a hydraulic fluid tank (1) when a vehicle is in operation, the invention provides for the tank to be compartmentalized by an anti-overflow partition (16). The anti-overflow partition is made in such a manner as to hold air captive inside the tank in the vicinity of a feed orifice (11) at a location placed in a top portion of said anti-overflow partition.

Abstract: A tank according to the invention comprises a casing, a filling port (5) extending, on the outside of said tank, into a filling neck (7), which is provided with a screw thread having a pitch (p) and which cooperates with a cap (9). The inner surface of the cap cooperating with the screw thread, at least one outlet port for the hydraulic-fluid flow towards a hydraulic circuit. The inner space (3) of the tank is connected with ambient air through two channels (45), that extend from a first lengthwise end (47) of the filling neck (7) to a second lengthwise end (49) of the filling neck (7) and through a helical passage (41) between the filling neck (7) and the cap (9) to connect the inside of the tank with the ambient air to avoid the development of negative pressure in the tank.