Abstract: A master cylinder (32) in a vehicle hydraulic braking installation uhydraulic-fluid supply device for actuating wheel brake cylinders (20). The master cylinder (32) being isolated from the wheel brake cylinders (20) by at least one shut-off valve (30). The master cylinder (32) being associated with a simulator (46) having a piston (50) located in a simulator chamber (56). The piston (50) being subjected to fluid pressure of brake fluid from the master cylinder (32) and an elastic element (52). The master cylinder (32) being of the having a primary piston (44) and a secondary piston (60) slidably located in a bore (45) of a housing (48). Bore (45) has a peripheral groove (72) which is associated with a land (68) on the secondary piston (60) to allow communication with the simulator chamber (56) when the master cylinder (32) is in a positon of rest.

Abstract: A pressure-regulating solenoid valve (100) for a hydraulic circuit having at least one generator (300) of pressurized fluid, a pressure receiver (200) and a reservoir (400) of fluid under low pressure. The solenoid valve having an electric coil (10) which interacts with first (12) and second (14) pole pieces and a magnetic body (26). The magnetic body (26) moves under the effect of an actuating force (O) generated by a magnetic field created by the electric coil (10) and a distributor element (30) interacting with a sleeve structure (28) to command communication between a duct (66) connected to the pressure receiver and one of first (54) and second (42) ducts sequentially connected to the generator (300) of pressurized fluid or the reservoir (400) of fluid under low pressure.

Abstract: A pressure-regulating solenoid valve (100) for a hydraulic circuit for a braking system of a motor vehicle having wheel antilock structure. The hydraulic circuit has at least one pressurized fluid generator (300) connected to a pressure receiver (200) and to a reservoir (400) for retaining fluid at a low pressure. The solenoid valve (100) has an electrical coil (10) which interacts with two pole pieces (12,14), a sleeve structure (28,30) forming a magnetic body (26) which moves under the effect of an actuation force (O) generated by a magnetic field created by the electrical coil (10) and a distributor element (34). The distributor element (34) interacts with the sleeve structure (28,30) in order to command communication between a duct (98) connected to the pressure receiver (200) and a duct (94) connected to the reservoir (400) or a duct (96) connected to the pressure receiver (200).

Abstract: A proportional solenoid valve for regulating pressure of fluid supplied to a system. The solenoid valve has high-pressure inlet (1), a low-pressure inlet (2) and an outlet (3) through which fluid under controlled pressure is supplied to the system. The solenoid valve has a body (4) with bore (5) therein for retaining a regulating slide valve (9). The regulating slide valve (9) is subjected to a pressure acting on a cross-section (S), to the force of a spring (10) and to a force exerted by an electromagnet (14,15). Movement of the slide valve brings about a communication between the high-pressure inlet (1) and the outlet (3) and communication between the low-pressure inlet (2) and the outlet (3) as a function of a control valve (16). The control valve (16) is located between the high-pressure inlet (1) and the outlet (3) and the high-pressure inlet (1) and low-pressure inlet (2) are isolated from one another by the slice valve (9) as long as said control valve is not open.

Abstract: The invention relates to a flow limiter for hydraulic fluid, comprising at least one passage (14) of reduced cross-section for the hydraulic fluid, the passage (14) being formed between two contiguous pieces (12, 22) each having at lest one planar face (10, 20), at least one of the two pieces (12, 22) comprising a recessed impression (14) on at least one of its faces (10, 20), the passage (14) of reduced cross section being defined within the space situated between the recessed impression (14) formed on a planar face (10) on one of the pieces and the planar face (20) of the other piece (22), the length of the passage (14) of reduced cross section being adjustable by varying the relative position of the two pieces (12, 22). According to the invention, a pierced hole (18) is made in one piece (12) at one end of the passage (14) of reduced cross section and in that a pierced hole (24) is made in the other piece (22) at the other end of the passage (14) of reduced cross section.

Abstract: The invention relates to a hydraulic device for braking the wheels of a vehicle, especially for wheel anti-lock and/or anti-slip functions, comprising, between a chamber of a master cylinder and at least one brake motor, a plurality of solenoid valves (36) and a hydraulic pump driven by an electric motor including a rotor (10) arranged between two bearings (12, 14) and enclosed in a cylindrical sleeve (20) made of metallic material, the rotor driving in rotation an eccentric cam (24) imparting an alternating translational movement to radial pistons (26), the delivery outlet of the pump being connected to the solenoid valves (36) via hydraulic slides by way of fluid circulation channels (32, 34). According to the invention, the sleeve (20), in which the rotor is accommodated, is enclosed in a housing (30) made of non-magnetic material. The fluid circulation channels (32, 34) and the solenoid valves (36) extend in the housing.