Abstract: The invention relates to a brake-booster (10) of a vehicle, comprising a casing (12) and a diaphragm (14) which divides in a sealed manner the interior of the casing into a front chamber (16) and a back chamber (18), a hollow piston (20) movable in the casing receiving an input member (24) adapted to be connected to a brake pedal, an output assembly comprising a lid (30) and an output rod (32) adapted to be connected to a piston (34) of a master cylinder (36), a reaction disk (28) in a deformable material arranged between the hollow piston (20) and the lid (30) so as to receive an image of the output force of the booster (10) when it is put into operation in order to cause a deformation of the reaction disk (28) tending to push back the input member (24) as a function of the image.

Abstract: The invention relates to a vacuum-operated servo-brake comprising, in a casing consisting of a shell (10) and a cover (12), a piston (20) separating leaktightly two inner chambers (22, 24), a valve means controlled by a rod (32) projecting from the casing in order to ensure the operation of the servo-brake, and a prestressed spring (34) for returning the piston (20) to its rest position substantially abutting the cover (12), the spring (34) bearing on the shell (10). According to the invention, the spring (34) comprises a mechanism enabling its extension to be limited when the shell (10) and the cover (12) are not fixed to each other.

Abstract: The invention relates to a double brake booster for a motor vehicle, provided with a valve enabling the boost ratio to be varied as a function of the load of the vehicle. In addition to two pistons (64, 66) articulated to an arm (72), this valve comprises a pusher (80) driven by a third piston (68), to a first face of which is applied a first force representative of the load of the vehicle and to a second face of which is applied a second force of elastic nature, in opposition to the first, this third piston adopting, under the effect of the first and second forces, an equilibrium position which determines that of a variable bearing point for the lever which constitutes the arm (72). Moreover, the arm, the pusher and the three pistons are mounted in the same body, the arm and the pusher being housed in a single cavity (74) which is defined in this body and subjected to a low pressure, and toward which the second faces of the three pistons are turned.

Abstract: A hydraulically controlled brake system for a motor vehicle, comprising a master cylinder, a corrector intended for reducing the pressure prevailing in the rear-wheel brakes in relation to that prevailing in the front wheels, and a wheel anti-lock device. The corrector is of the type with a controlled shift of the cut-off point. During the operation of the anti-lock device, the cut-off point has a specific value higher than that of a corrector equipping the vehicle without a wheel anti-lock device, while it is substantially equal to the latter in the event of a failure of the device.

Abstract: A pressure reduction mechanism (10) is installed in a brake circuit of the rear axle of a motor vehicle, comprising a master cylinder (1) and at least one monitoring device, the mechanism executing the brake-pressure reduction only in specific circumstances and comprising a regulating piston (14) sliding sealingly in a bore (13) and stressed by at least one spring (16, 17) in the opening direction of a regulating valve (15). The spring (16, 17) is arranged in a sealed chamber filled with an incompressible fluid, and a solenoid valve (22) controls the opening or closing of communication between the chamber and a reservoir of the fluid under low pressure.

Abstract: The circuit controlls a fluidically controlled brake regulator (7) in dependence on the load of a vehicle having at least two wheels each provided with a suspension member (1, 2). Each suspension member (1, 2) cooperates with a fluidic pressure sensor (11, 12) to control the regulator (7) in dependence on the load carried by only one of the wheels, namely the wheel carrying the lighter load.

Abstract: The invention relates to a brake subassembly for a vehicle having an engine compartment and a passenger cell separated by a bulkhead (46), the subassembly comprising: a pneumatic boost servomotor controlled by way of a pedal (28) and intended to be fixed to the bulkhead (46), the servomotor comprising, coaxially, a front shell (14), having a cylindrical wall, and a rear cover (16) and having, on the inside, two chambers (18, 20) separated in leaktight fashion by a piston (22) provided with a diaphragm (26) ensuring leaktightness between the two chambers, a master cylinder (10) fixed to the front shell (14) and at least one brake pedal (28).

Abstract: A bearing piece for a suspension unit of a motor vehicle, acting as a pressure sensor for a fluid-controlled brake regulator and intended to be mounted between a suspension element (12, 14) and a part of the vehicle by way of an elastic bearing (16) or, a pivoting mounting, has a piston mechanism (20) which can move counter to the pressure prevailing in a leaktight chamber (24). A mechanism (30, 34, 36, 40, 42) is provided so that the pressure in the leaktight chamber (24) is greater than a predetermined pressure.

Abstract: A pneumatic brake booster (10) capable of operating without being actuated by a pedal (14), possesses at least one fixed part (36) and a control rod (12) with which the pedal cooperates (14). A sleeve (30) bears against the pedal (14) and partially surrounds the control rod (12), the control rod (12) possesses a shoulder (32) forming a stop cooperating with the sleeve (30) at rest and when the brake booster is actuated by the pedal (14), and the sleeve (30) is loaded by a spring (34) maintaining the pedal (14) at a given distance from the fixed part (36) of the brake booster (10) while the pedal (14) is not actuated.

Abstract: The invention relates to a pneumatic brake-booster comprising, in series, a control rod (10) substantially fixed to a plunger (12) by a pivot mechanism (14), a reaction disk (16) and a push rod (18), the control rod (10) actuating a three-way valve with two seats (24, 26), s specific space being provided at rest between the reaction disk (16) and the plunger (12). According to the invention, one of the two seats of the valve consists of the end of a sleeve (30) coaxial with the plunger (12), a prestressed compressible mechanism (32) tending to shift the sleeve (30) and plunger (12) axially away from one another, the sleeve (30) coming axially up against one end of a piece (36) fixed to the control rod (10) after the relative positions have been set.

Abstract: The invention concerns a vacuum-type booster comprising a case divided internally into a vacuum chamber and a working chamber by a piston comprising a valve mechanism possessing a double valve (20) enabling, in the rest postion, a communication between the two chambers which are then isolated from the environment and, in the working position, an isolation of the vacuum chamber and a communication between the working chamber and the environment at atmospheric pressure, this valve mechanism being normally controlled by an actuating rod (12) extending out of the case. According to the invention, it comprises, in addition, an electromechanical device (50, 52, 54) for controlling the valve mechanism independent of the actuating rod (12).

Abstract: The load sensing brake proportioning valve of a vehicle comprises a first piston (14) sliding in a stepped bore made in a body, and carrying a normally open shutter (18) arranged between a source of fluid under pressure and the associated brake circuit, the first piston (14) being moveable counter to a spring (16) under the effect of the pressure of the fluid which tends to close the shutter (18), a sliding rod (24) normally bearing between a pusher (20), the position of which is a function of the load of the vehicle, and the shutter (18). The proportioning valve comprises a locking mechanism immobilizing the sliding rod (24) as soon as the pressure of the fluid in the associated brake circuit exceeds a specific threshold.

Abstract: A pneumatic brake booster of the tandem type for the brake boosting of motor vehicles, comprises a movable hub (15) driving a push rod (11) by of a reaction disk (17), a closed containment composed of a front shell (1) on the same side as the master cylinder and of a rear shell (3) on the same side as the actuating pedal, which define a front chamber and a rear chamber separated by a separating element (5) having an annular partition (9), and a front piston (25) and a rear piston (35) respectively arranged coaxially in the front and rear chambers. These chambers are themselves respectively divided by a sealing diaphragm (27, 37) fixed to each of the pistons (25, 35), in order to define, within each of these, a sub-chamber of constant pressure (21, 31) and a sub-chamber of variable pressure (23, 33), the pistons (25, 35) being movable in the axial direction under the effect of the differences in the pressures prevailing between the sub-chambers of each chamber.

Abstract: The instantaneous load sensor of a motor vehicle is incorporated in a suspension assembly of the vehicle, and comprises a suspension element (1) fastened via an elastic mechanism (3) to a rod (5) carried by a yoke (7). The rod (5) is a blind hollow tube, in which a slot (12) has been made substantially in the axis of the suspension element (1) and opposite the latter, so as to allow the elastic mechanism (3) to penetrate into the tube (5), a sensor (10) of the pressure prevailing in the tube hermetically closing the open end of the tube.

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).