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 system for regulating pressure in a hydraulic circuit comprising at least one generator (110) of fluid under pressure, at least one reservoir (120) of fluid under low pressure and at least one pressure receiver (130, 130a, 130b). The system has least one solenoid valve with an electrical winding (18, 18a, 18b) and a moving magnetic core controlling the position of a distributor slide valve (16, 16a, 16b) which slides in a bore (14, 14a, 14b). Bore (14, 14a, 14b) communicates with a first duct (82) connected to the generator (110) of fluid under pressure, a second duct (12) connected to the pressure receiver (130, 130a, 130b) and a third duct (78) connected to the reservoir (120) of the fluid under low pressure. The system operates in response to a first type of control signal. (S1, S, Sa, Sb) derived from a plurality of inputs corresponding to the operation of a vehicle.

Abstract: An automatically controlled braking system comprising a pneumatic vacuum servo and a pneumatic solenoid valve capable of selectively connecting the serov to first or second sources of pressure. The solenoid valve includes a flap valve which is subjected to a suction force proportional to the difference between the first and second source of pressured and acts in the same direction as an electromagnetic actuating force. Elastic means act on and apply a greater force to the flap valve to oppose the suction force. A current generator supplies a current having a predetermined maximum intensity to the solenoid to develop an actuation force overcome the elastic force and effect actuation of the vacuum servo.

Abstract: A module for controlling pressure in a hydraulic circuit, comprising at least one generator of pressurized fluid, at least one reservoir of low pressure fluid, and at least one pressure receiver. The module including a solenoid valve having an electric coil and a movable magnetic core plunger. The plunger being moved to controlling a position of a distributor slide valve which slides in a bore formed in a body. The bore communicating with a feed passage connected to the generator of pressurized fluid, a distribution passage connected to the pressure receiver, and a pressure relief passage connected to said reservoir of low pressure fluid. The module having a pressure controlled valve located between the generator and the feed passage.

Abstract: This three-way pneumatic solenoid valve comprises: a first inlet (1) connected to a first pressure source (A); a second inlet (2) connected to a second pressure source (D); an outlet (3) connected to a chamber at controlled pressure (C); a hollow body (4) into which t here emerges each of the paths so as to be set in communication therein in a selective fashion with at least one other path; and an electromagnet (5) secured to the body and including a core plunger (5a) capable of actuating means suitable for establishing the selective communication.The latter essentially comprise a stationary valve (6) and a movable valve (7) housed in the hollow body, the stationary valve being capable of being open when the movable valve is closed and vice-versa, and these valves being defined by a shaft (60), a tubular and movable stopper member (67), and a sealed surface (70) actuated by the electromagnet.

Abstract: A distributor for controlling the distribution of fluid to a brake system which includes an anti-lock and an anti wheelspin function and in particular functional operation during a brake condition wherein the front wheels are actuated at the same time a single back wheel is actuated.

Abstract: The invention relates to a pressure regulation device for a hydraulic system comprising at least one generator (30) of fluid under pressure, a brake actuator (28) and a reservoir (32) of fluid under low pressure, and including an electrovalve controlled by a computer, the electrovalve being connected via a duct (29) to the generator (30) of fluid under pressure and via a duct (31) to the brake actuator (28), and comprising in a casing (8) an electrical coil (10) and a sliding magnetic core (12) controlling a slide valve (16) sliding in a bore provided in a body (18), the slide valve (16) determining two chambers (22, 40) arranged on either side of the slide valve (16) and being formed with a valve (48) with ball (50) co-operating with a seating (52) formed on the casing (8), the slide valve (16) being formed with a groove (34) delimited by two bearing surfaces (36, 38).

Abstract: The invention relates to a pressure regulation device for a hydraulic system comprising at least one generator (30) of fluid under pressure, a hydraulic actuator (28) and a reservoir (32) of fluid under low pressure, and including an electrovalve controlled by a computer and comprising in a casing (9) an electrical coil (10) and a sliding magnetic core (12) controlling a slide valve (16) sliding in a bore provided in a body (18), the slide valve (16) determining two chambers (22, 36) arranged on either side of the slide valve (16) in the bore, the slide valve comprising a hydraulic chamber (40) communicating with the hydraulic actuator (28) and determining a reaction force adding itself to the force produced by the coil (10), against a prestressed resilient means (20). The hydraulic chamber (40) is delimited by a bore (41) made in the slide valve (16), an end part (43a) of a sleeve (43), a rod (42) and a cup (60) for leaktightness between the rod (42) and the bore (41) of the slide valve (16).

Abstract: The invention relates to a pressure-regulating device for a hydraulic circuit, especially for a brake circuit of a motor vehicle, comprising at least one source of fluid under pressure (10) connected to a reservoir of fluid under low pressure (16) and, in at least one subcircuit (I, II), a second source of fluid under pressure (50) and two pressure receivers (20, 22). According to the invention, a proportional solenoid valve (24, 26) is associated with each pressure receiver (20, 22) and is connected to the source of fluid under pressure (10) and to the second source of fluid under pressure (50), and a differential pressure/vacuum valve (100) closes, at rest, communication between the source of fluid under pressure (10) and the supply of the second source of fluid under pressure (50), this communication being opened when the second source of fluid under pressure is put into operation.

Abstract: The invention relates to a solenoid valve, in particular for a hydraulic braking circuit of a motor vehicle with a wheel antilockup device, the solenoid valve being disposed between at least a pressurized fluid source (52) and at least a pressure receiver (56) and comprising, in a body (10), a piston mechanism (24) which can be displaced between a rest position, in which it permits communication between the pressurized fluid source (52) and the pressure receiver (56), and a work position, in which it permits communication between the pressure receiver (56) and a low-pressure fluid reservoir (66). According to the invention, the piston mechanism (24) is permanently stressed toward the rest position by a constant force.

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 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: 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 pressure-regulating system for a hydraulic circuit, comprises at least one generator (22) of fluid under pressure, a hydraulic motor (20) and a reservoir (24) of fluid under low pressure. It further includes a solenoid valve controlled by a computer and comprising an electrical coil (1) and a sliding magnetic core (3) controlling a slide (7) sliding in a bore provided in a body (9). The slide (7) defines two chambers (11, 15) arranged on either side of the slide (7) in the bore. The slide (7) comprises a hydraulic cell (26) determining a reaction force opposing the force generated by the coil (1), the cell (26) being connected to one of the chambers (11, 15) as long as the solenoid valve is not energized, while it is connected to the hydraulic motor (20) after energization. An elastic mechanism (13) returns the slide (7) and the core (3) to the rest position.

Abstract: The pressure-regulating system for a hydraulic circuit, comprises at least one generator (22) of fluid under pressure, a hydraulic motor (20), a reservoir (24) of fluid under low pressure and a solenoid valve controlled by a computer and comprising an electrical coil (1) and a sliding magnetic core (3) controlling a slide (7) which slides in a bore provided in a body (9). The slide (7) defines two chambers (11, 15) arranged on either side of the slide (7) in the bore, and it comprises a hydraulic cell (26) communicating with the hydraulic motor (20) and determining a reaction force added to the force generated by the coil (1), counter to a prestressed elastic means (131) and to a return spring (132) returning the slide (7) and the core (3) to the rest position.

Abstract: A hydraulic braking circuit comprises at least one brake fluid source (26, 36), a master cylinder (10), the outlets of which are connected to at least one sub-circuit comprising at least one brake motor (14, 16), and which is controlled by way of a pedal (12), and an electronic control unit (22). It also comprises a pressure generator (24), and an electrovalve (28, 30) which is arranged in each sub-circuit, so as to establish a connection, when at rest, between the outlets of the master cylinder (10) and the associated brake motors (14, 16) and, in the excited position, between the outlets of the generator (24) and the associated brake motors (14, 16), the control unit (22) being capable of simultaneously controlling the functioning of the pressure generator (24) and the excitation of the electrovalve (28, 30).

Abstract: The brake system comprises two hydraulic sub-circuits, each connecting a driving wheel and a free wheel to a working chamber of a master cylinder (1) connected to a general reservoir (20) of fluid under low pressure, and including a wheel anti-lock braking device comprising a three-way solenoid valve (51, 52, 53, 54) normally opening communication between an inlet of fluid under pressure and the brake motor, while, in the expansion phase of the anti-lock device, it closes this communication and connects the brake motor to a reservoir (21, 22) of fluid under low pressure to each sub-circuit. The device comprises a differential valve slide consisting of a valve of which one face receives the pressure prevailing in the associated brake motor (31, 32, 33, 34) and the other that as generated by a pump (45, 46) and, at rest, putting in communication the working chamber of the master cylinder (1) and the inlet of fluid under pressure.

Abstract: A device for the control of a double-acting hydraulic jack (10) comprises in a main circuit, a distributor assembly (28, 28', 34, 34') electrically controlled and commanding the putting of each of the two chambers (14, 16) of the jack selectively in relation with a source of fluid under high pressure (20, 26) or with a reservoir of fluid at low pressure (24), and an auxiliary circuit controlled by a mechanism (76) sensitive to the position of the piston (12) of the jack (10). The auxiliary circuit comprises a slide distributor (50) which ensures the return of the piston (12) of the jack (10) into a rest position in the event of a failure of the electrical control mechanism by governing the distributor assembly (34, 34') of the main circuit.

Abstract: The hydraulic booster device for a brake circuit, comprises a body (30) pierced with a bore (32), in which slide coaxially a pusher (25) controlled by a brake pedal and a piston means (34) located between first (5) and second (33) chambers containing a brake fluid, the first chamber (5) receiving at least one spring (51, 52) which loads the pusher (25) and the piston means (34) away from one another, the first (5) and second (33) chambers being connected respectively to sources of fluid under low pressure (11) and under high pressure (13) by valve mechanism (15). An auxiliary chamber (4) of a volume variable as a function of the position of the pusher (25m), made in the bore (32), communicates with the first chamber (5), on the one hand permanently by way of a restriction (6) and on the other hand by an auxiliary valve mechanism (3) allowing communication during an increased in the volume of the auxiliary chamber (4) and preventing it during a reduction of the latter.

Abstract: The modulator is intended for diverting a specific quantity of fluid under high pressure from the supply circuit of a hydraulic motor for a power-steering of motor vehicles, comprising a body (48), a bore (50) in the body, a modulator slide (52) movable axially in the bore under the action of a control member (98), an inlet orifice (58) and a fluid outlet port (60) opening into the bore (50). The slide (52) has first and second bearing surfaces (82, 84) substantially of the diameter of the bore and separated by means of a narrowed section (86), opposite which the inlet orifice (58) opens out, the second bearing surface (84) controlling the outlet port (60). Furthermore, the slide (52) defines a first chamber arranged between the first and second bearing surfaces (82, 84) and second and third chambers arranged on either side of the slide (52) and communicating with one another.