Abstract: The brake circuit with hydraulic amplification of the input force is connected to a working chamber of a master cylinder (1) controlled by a brake pedal and comprises a source of fluid under high pressure (5), a brake motor (12) and a first valve (10) which, by way of a non-return valve (17), makes or breaks communication between the source of fluid under pressure (5) and the brake motor (12) as a function of the difference between the pressures of the fluid of the source and the fluid in the working chamber of the master cylinder. The brake circuit comprises, furthermore, a second valve (20) pilot-controlled by the pressure of the fluid of the source (5) and having a shutter (24) normally breaking communication between the working chamber and the brake motor (12) and making this communication in the event of a failure of the source.

Abstract: The booster comprises, arranged coaxially, a piston 4, a plunger 20 seated in the piston and integral with a control rod 12, a push rod 16, a reaction disc 14 and an assembly of valve shutters interacting with one end of the plunger and with a seat 18 forming part of the piston. The assembly of valve shutters comprises a first shutter 24 coming to bear on the seat 18 and a second shutter 34 accompanying the plunger 20 until its stroke is stopped by a counterstop 58, the axial position of which is adjustable from outside.

Abstract: The hydraulic braking circuit is fitted with a master brake cylinder controlled by a brake pedal and with a wheel-antilock device, for a motor vehicle. This device comprises a pressure generator (20), which is started up at the beginning of an antilock-braking sequence, for selectively supplying at least one wheel brake (5, 6), and a member for automatically isolating the wheel brake (5, 6) from the master brake cylinder (1) when the pressure generator is started up by bringing the wheel brake into communication with means for storing the brake fluid, means are provided for limiting the pressure of the hydraulic fluid provided by the pressure generator to a value which is function of the jamming pressure.

Abstract: A peripheral protection device for two metal pieces (10, 12) fitted into one another and having a general flange shape, the first (12) of which has an edge (18) extending outwards and the second (10) of which has a marginal zone, a first part (14) of which has substantially the form of a capital S whose vertical axis is substantially parallel to the edge (18) and a second part (16) of which is substantially perpendicular to the edge (18) consists of an arc having, in section, the general form of the capital letter C enclosing the edge (18) and the marginal zone.

Abstract: In the double brake-booster and master cylinder assembly, the booster comprises, in an outer casing 10, a fixed partition 11 defining, inside the casing 10, a front space A and a rear space B, each space A, B being divided in a sealed manner into a front chamber 12, 18 and a rear chamber 14, 20 by a movable partition 16, 22, at least one elastic mechanism 31 tending to displace one 16 of the movable partitions 16, 22 rearward, at least one passage 38 connecting the two front chambers 12, 18, at least one passage 53 connecting the two rear chambers 14, 20, a pressure difference being established between the front 18 and rear 20 chambers of the rear space B by a valve mechanism 35 on actuation of a control rod 27 in order to actuate an output rod, the output rod actuating a piston of the master cylinder.

Abstract: The supporting component for a suspension spring (3) for a motor vehicle, forming a pressure sensor for a fluid-controlled brake regulator, comprises a base (1) integral with the vehicle, and a cap (5) for supporting the spring (3), which cap (5) is sealingly and slidably mounted on the base (1) counter to the pressure prevailing in a sealed chamber (20) coaxial with the spring (3) and formed between the base (1) and a part integral with the cap. The chamber (20) communicates with a chamber, outside the support component, for controlling the regulator, and a mechanism (10) for guiding the cap relative to the base is arranged axially to the center of the component.

Abstract: A pneumatic brake-booster comprises a casing on which is formed a well (12) housing operating valve mechanism, a first wall (10) having at least one opening (14) cooperating with a mechanism for fastening the casing on a fixed part of a vehicle, a second wall having at least one opening cooperating with a mechanism for fastening a master cylinder on the casing, at least one annular member (16) being disposed in the casing, against a wall. The fastening mechanism consists of at least one projecting portion (18) of the annular member (16).

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 pneumatic brake booster comprises a housing formed from a front and a rear half-shell 12 and 10, a piston structure dividing the housing internally into two chambers and composed of an assembly consisting of a plate 18 and of a diaphragm 20 and possessing centrally a hub structure 24 containing a distribution valve mechanism 26 actuatable by an input member 56 in order to generate a pressure difference selectively between the chambers. The valve mechanism 26 comprises a plunger 28 mounted axially slideably in a coaxial central bore 30 of the valve body and connected to the input member 56, the plunger defining a first shutter seat 32 at one of its ends, a second shutter seat 34 being formed in the valve body concentrically relative to the first shutter seat and a shutter means 36 mounted in the valve body and stressed elastically toward the first and second shutter seats, at least one elastic means 60 stressing the input member 56 axially away from the shutter seats.

Abstract: The pneumatic booster of the vacuum type comprises mainly a housing (12) divided into two chambers (7, 8) by a movable wall structure (6), constructed of a substantially radial plate (9) and a flexible diaphragm (10) secured by its outer peripheral edge to the housing (12), and forming a flange (11) in the space between the plate (9) and the housing (12). The plate is centrally integral with a hub structure housing, a distribution valve device and linked to a control member and to a controlled member, each by a swivel connection. The plate (9) has at its outer edge an extension (13) cooperating in a non-leaktight manner with the internal wall of the housing (12) in order to ensure axial guidance of the movable wall (6) inside the housing (12).

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.

Abstract: The leakage-type pressure regulator for a hydraulic circuit, including at least one reservoir of fluid under low pressure (5), a pump (11) and an accumulator of fluid under high pressure (9), comprises: a pusher (19) projecting from a chamber (3) connected to the reservoir (5); at least one sensor (27) detecting the position of a magnetic core (23) sliding under the effect of the pusher (19) in the vicinity of the sensor (27), so as to control the functioning of the pump (11); a piston (17) sliding non-sealingly in a bore (7) communicating with a chamber (3) on the one hand and with an outlet of the accumulator (9) on the other hand, so as to establish a leakage of the hydraulic fluid between the accumulator (9) and the reservoir (5), the piston (17) having one end bearing on the pusher (19); and an elastic means (21) opposing the effect of the pressure of the fluid in the accumulator (9) on the piston (17), in such a way that the position of the core (23) is a function of the pressure of the fluid in the acc

Abstract: The vacuum servomotor comprises a main casing (12) divided sealingly on the inside into first and second chambers (10, 20) by a flexible membrane (9) bearing on a rigid disk (7) integral with an activating piston (3). The first chamber (10) is subjected to a low pressure, while the second chamber (20) is subjected either to this low pressure or to a higher pressure. An auxiliary casing (25) is integral with the rigid disk (7) and projects into the first chamber (10), an auxiliary piston (27) sealingly dividing the auxiliarly casing (25) on the inside into third and fourth chambers (30, 40), the third chamber (30) being closed by the rigid disk (7), the auxiliary piston (27) being mounted stationary relative to the main casing (12).

Abstract: The bleed valve (22) especially for a hydraulic brake circuit, comprises a fluid reservoir (20), a hydraulic motor (26) and a mechanism for putting the fluid under pressure (24), and has a first port (42) connected to the motor (26) and to the mechanism (24) by way of a first conduit (62) and a second port (54) connected by way of a second conduit (60) to the reservoir (20) which is likewise connected to the inlet of the mechanism (24) by way of a third conduit (64), the first and second conduits (60,62) communicating with one another by way of the valve (22) during the initial bleeding phase of the hydraulic circuit, and no longer communicating from the moment when the fluid is first put under pressure. The valve (22) comprises a piston (36) capable of sliding in a bore (32,34) and keeping the shutter (44,42) of the valve open during the bleeding phase counter to a compressed spring (46 ).

Abstract: The assembly is composed of a vacuum pneumatic booster (1), a master cylinder (3) and a reservoir (5) of fluid under low pressure which feeds the master cylinder, and is intended to convert a force exerted on a control pedal into a fluid pressure supplying at least one fluid motor. The booster (1) has at least one chamber connected to a vacuum source via a non-return valve (30). This chamber is connected to the source via a duct (21) formed in the master cylinder (3), the non-return valve (30) being arranged at the outlet of the duct (21). The non-return valve (30) is arranged at the end of a pipe (25), the other end of which is connected in a sealed manner to the duct (21), the non-return valve (30) and the pipe (25) being incorporated into the reservoir (5).

Abstract: The brake regulator controlled by the load of a vehicle uses a fluidic mechanism which acts on a first piston (7) capable of translatory movement in a bore formed in the body (1) of the regulator, the first piston (7) being provided with a push rod (33) capable of cooperating with one end of a second piston (21) forming part of a valve which is open in the rest position. Mechanisms (31,37) are provided for maintaining, at rest, a given distance between the end of the second piston (21) and the push rod (33), the given distance being such that the end of the second piston (21) and the push rod (33) do not come into contact until just before the closure of the valve. Preferably, the push rod (33) is, at rest, in axial abutment against a stationary part (31) of the body (1), the second piston (21) being returned to rest by a spring (41).

Abstract: The process is for adjusting the value of the jump of a brake booster, in which are movably mounted a hollow boosting piston, a control rod carrying a plunger seated in the piston and a push rod, boosting means being controlled as a result of a forward movement of the plunger and their effect being to move the piston forwards, a reaction disc being interposed between an annular front face of the piston and a rear face of the push rod, the booster being intended for actuating a master cylinder.

Abstract: A braking corrector governed by the height of a vehicle, comprises a body (10), in which is slideably mounted at least one piston controlled by an actuating rod (12) and arranged so as to interact with at least one valve element, in order to control at least one brake-fluid passage between at least one inlet (14,16) and at least one outlet (18,20) of the corrector. The corrector possesses a sensor detecting the height of the vehicle and formed from a lever (32), the pivot (34) of which is stationary relative to the body (10) of the corrector and one end (36) of which is connected to an unsuspended part of the vehicle, the distance between this end (36) and the pivot (34) defining a first lever arm, and the lever (32), which actuates the actuating rod (12) at a distance from the pivot (34), defining a second lever arm. The corrector possesses a mechanism (40,46,48,54) for varying the ratio between the lengths of the first and second lever arms.

Abstract: The modulator is intended, under the control of a solenoid valve, for diverting a flow of fluid under high pressure from the fluid supply circuit of a hydraulic motor.The solenoid valve is a progressively acting solenoid valve, the shutter (70) of which is capable of more or less closing communication between the fluid inlet (56) and the inlet chamber (108) of the regulator as a function of the signal applied to the solenoid valve; furthermore, the spring (116) bears on a piston (132) which closes the regulating chamber (117) and behind which is formed a reaction chamber (128) communicating with the fluid inlet (56).