Abstract: The servomotor, of the vacuum type, comprises a housing composed of two shells, each comprising a peripheral sleeve and a side end wall. The shells include a connecting web between the sleeve and the side wall, parabolic in profile, due to which the resultant of shearing and traction stresses is minimal, which allows the thickness of the shell material to be significantly reduced. Applications are braking systems with vacuum servomotor for motor vehicles.

Abstract: The braking corrector according to the invention consists of two corrector valve seats (332, 332') and two inertia weights (328, 328') mounted in parallel in the same casing (312), and two magnets (336, 336') mounted on the same iron plate (340), the magnetic poles of the magnets being reversed so that the magnetic field (M) set up by the magnets (336, 336') is looped through the plate (340) on the one hand, and through the inertia weights (328, 328') on the other.

Abstract: Brake motor with automatic adjustment, comprising a body (20) which incorporates a groove (62). A piston is mounted in this body and has a pivot (48) which guides the piston in the groove. A pawl (46) mounted at one end on the pivot (48) and applied elastically via a slope (64) against a portion (66) fixed relative to the body (20) stresses a toothed wheel (44) in terms of rotation when the relative axial movement between the body (20) and piston exceeds a predetermined value. The toothed wheel (44) integral with a nut causes the lengthening of a screw/nut system, thus ensuring automatic adjustment. The invention is used for braking motor vehicles.

Abstract: The device (10), mounted elastically for example on a projecting part (30) of the caliper adjacent a projecting part (8) of the fixed support (5), incorporates a flat leaf surface (15) intended to be interposed between the cooperating slide surfaces of the caliper (31) and the support (82) and formed at the end of an intermediate leaf zone forming a flexible ramp surface (14) which cooperates, when fitting the caliper into position, with the adjacent part (8) of the fixed support (5) so as to cause the flat surface (15) to deflect and thus ensure automatic locking of the caliper, the unlocking being easily achieved manually by a similar retraction of the flat slide surface (15). The device (10) is made in a single piece from a sheet of stainless spring steel.

Abstract: A disc brake of the type comprising a caliper (10) mounted to slide on a fixed support (12) by way of a pin (14) extending parallel to the axis (0) of the disc (16), the fixed support (12) comprising two arms (28, 30) extending radially towards the periphery of the disc (16), the latter defining when it rotates in the forward direction of rotation (AV), a front arm (28) and a rear arm (30) of the fixed support (12), a brake motor (32) acting directly on an inner friction element (40) and, as a result of reaction via the caliper (10), on an outer friction (42).

Abstract: The rotors (M, F) each have a conical outer profile and a constant pitch diameter, the rotors being mounted in opposition in the housing (1) with their axes (2, 3) parallel and their pitch diameters tangent (4). The grooves (5) of the female rotor (F) have a radial depth, in relation to the pitch diameter, which varies in inverse proportion to the outside diameter of the female rotor (F), and which, more specifically, have a circular cross-section the radius of which increases progressively in the direction of reduction of the outside diameter of the female rotor, the center of these radii remaining on the pitch diameter. The rotors are produced advantageously by molding a plastic or by casting a light alloy.

Abstract: A brake corrector (20a) comprising a housing (26) having a bore (28) therein in which a stepped corrector piston (32) and a control piston (38) slide. A first corrector valve (66), controlled both by the corrector piston and by the control piston, and a second corrector valve (70), mounted fixed in the housing and controlled by the control piston, regulate the flow of fluid between a pressure generator of the tandem type (10) and two rear-brake motors of a vehicle (18, 24). The control piston (38) comprises two adjacent parts (38a, 38b) which define a control chamber (50) between them, the latter being connected to the pressure generator (10) via an isolating valve (20b) controlled as a function of the deceleration of the vehicle.

Abstract: The brake comprises two shoes lined with friction elements stressed by a clamping mechanism located between two first ends of the shoes, a fixed anchoring block located between the other two ends of the shoes, and a spacer (44) mounted in the vicinity of the clamping mechanism and bearing by each of its ends on each of the shoes.

Abstract: The two chambers (8, 9) on either side of the movable wall structure forming a piston (7) are each sealingly delimited internally by a first and a second flexible impervious walls (23) which connect the central hub part (11) incorporating the control valve (12) to the central annular end zones (22 ; 24) of the corresponding end walls (2 ; 3) of the housing, the central zones delimited peripherally by said flexible walls being interconnected by at least a passage (39) traversing the central hub part, thus providing in the center of the housing a neutral cylindrical zone (32). In this neutral zone (32) there extend force-transmitting elements (38) which have at their ends fastening means (40), for example with assembly flanges (41, 42), and which slidingly pass through said passages (39) formed in the body of the central hub part (11), thus in no way interfering with the control and fluid actuation system of the servo-motor.

Abstract: The compressor, with rotating assemblies of low inertia, and of compact construction, comprises, housed in a housing, two hollow rotors (5, 6), for example out of plastic material, fixed respectively on a front shaft member (20, 21) journalled in a front bulkhead (26) and each supported at the rear by a rear bearing assembly (11) fixed to a rear end wall (2) of the housing and entirely contained within the internal space (7, 7) in the rotor. The drive is provided by the female rotor (6). The inner surfaces of the housing and the outer surfaces of the rotor threads are coated with an overthickened layer of an erodable coating material containing particles of a dry lubricant material.

Abstract: The generator unit is of the type including a valve (14,114,214,314) for maintaining a residual pressure. The valve (14,114,214,314) comprises a closure element (32,132,232,332) urged by a spring (42,142,242,342) towards a seat (30,130,230,330). According to the invention, it also includes a temporary retaining member (50,152,252,352) holding off the force of the spring and responsive to at least the presence of brake fluid to release the spring (42,142,242,342). The invention and application may be utilized in hydraulic braking systems for motor vehicles.

Abstract: The servomotor comprises a piston assembly (9) provided with a tubular hub (25) sliding on a valve sleeve (11) provided with a return roller (51) for a flexible elongate member (40) fixed between an end wall (4', 43) of the casing and an arm (47, 48) of the piston assembly normally extending beyond the return roller (51), between the latter and said end wall.

Abstract: A disc brake includes a caliper slidably mounted on a fixed support through an axial column projecting from the fixed support. Rotation of the caliper about the axial column is prevented by the engagement of complimentary axial sliding surfaces on the caliper and on the fixed support. Upon axial movement of the caliper with respect to the fixed support in excess of a predetermined distance, the sliding surfaces may be disengaged, thereby permitting the caliper to swing about the column so that the friction elements may be replaced. Movement of the caliper with respect to the fixed support is normally kept to a distance less than the predetermined distance by a stop pin carried by the caliper.

Abstract: A spot-type brake comprises a caliper movable during braking to engage a pair of friction elements with a rotor. The rotor comprises a first part and a second part. The first part is engageable with radially outer portions of the pair of friction elements and the second part is engageable with radially inner portions of the pair of friction elements. The rotor parts and the pair of friction elements are V-shaped with the rotor parts forming a spacing therebetween to receive a movable support which urges one of the pair of friction elements into engagement with the rotor and a fixed support opposing the one friction element.

Abstract: Device for automatically taking up play designed to be inserted between two consecutive portions of a mechanical control.The device includes two telescopic connecting parts (32, 34), which are movable in the axial sense within a fixed casing (22), and are respectively connected to consecutive portions (10, 12) of the control and releasable lock (66) which operate unidirectionally when the connecting parts move in the linear sense, characterized in that the lock comprises a component constituting a cam or eccentric (66) pivotally mounted on one of the connecting parts (32) so as to come into engagement with a surface (76) arranged opposite it on the other of the connecting parts (34) when the control is operated in an axial sense so as to provide, as a result of a wedging action, locking of the two connecting parts in the sense of linear movement.

Abstract: A method of forming a casing for a booster wherein the casing is preliminarily preformed with a peripheral sleeve portion and a flat base portion connected by a web. The preformed casing is placed in a frame and the peripheral sleeve portion held in substantially fixed position to maintain a required transverse dimension. A reinforcing member is positioned adjacent the flat base and an axial force applied to the reinforcing member to prestress the web to a final desired shape.

Abstract: The compensator (20) comprises a housing in which there are disposed a compensator piston (30) between an inlet chamber (38) and an outlet chamber (42), and a pilot piston (48) between the outlet chamber (42) and a pilot chamber (52), the two pistons controlling a compensator valve (46) disposed in a passage (44) connecting the inlet and outlet chambers. A pilot valve (90-92) controlled by an inertia weight (72) is mounted in a passage (82, 80, 70, 88, 84, 86) connecting the inlet chamber (38) and the pilot chamber (52). A spring (94) returns the weight (72) in the direction of opening of the pilot valve (90-92). According to the invention, the spring (94) is interposed between the compensator piston (30) and the inertia weight (72).A compensator of this type is used in the braking systems for motor vehicles.

Abstract: The corrector comprises two identical parallel pistons which control the opening and closing of two valves located between two inlets and two outlets of two braking circuits. Two push rods subjected to a control pressure urge the pistons in the direction for opening the valves. A reaction spring cooperates with a transmission element to urge the push rods in the opposite direction. When both braking circuits are being supplied, the corrector presents an identical cut-off point for the two circuits. In the event of one of the circuits failing, the transmission element undergoes tilting which results in an unequal sharing of the reaction force and an increase in the cut-off point in the undamaged circuit.

Abstract: The Compensator is of the type in which the cut-off point is defined by measurement of the pressure of the brake liquid trapped in a pilot chamber when the latter is isolated by closure of a valve associated with a mass which is responsive to the deceleration of the vehicle and which is urged by resilient means towards a position corresponding to the opening of said valve.It is characterized in that it comprises means responsive to the braking pressure, which modify the calibration of said resilient means as a function of said pressure.The braking compensator is applicable to braking systems for motor vehicles.

Abstract: The tandem master cylinder is provided with an equalizer device comprising a plunger mounted intermediate two chambers which are respectively connected to the two cavities of the master cylinder. At least one of the ducts connecting the master cylinder and the equalizer device is formed with a constriction slowing down the flow of brake fluid so as to permit a pressure buildup in one of the braking circuits, in case of failure of the other circuit, since the very start of the pedal stroke.