Abstract: A boosted braking device having a master cylinder and a pneumatic booster wherein the force for actuating the master cylinder is derived from a combination of an input force and a boost force of the booster. A main hydraulic piston of the master cylinder has a holler cylinder for receiving the input force. A secondary hydraulic piston located within the holler cylinder of the main hydraulic piston receives a hydraulic reaction force to impart an increasing braking force corresponding to an input force applied over an entire travel of a brake pedal.

Abstract: A pressure-holding valve for a brake system having a body with a blind bore therein. The body has a first passage which connects the blind bore with a variable pressure inlet port and a pressure outlet port. The blind bore is closed by seals carried on a plug having an axial passage therein connecting said inlet port with a second passage connected to the first passage. A non-return valve is located in said blind bore between the plug and the bottom of the blind bore while a valve controlled by an electromagnet is locate in the plug. In response to an operational signal the valve controlled by the electromagnet is moved into engagement with a seat to interrupt communication between the inlet port and the first passage.

Abstract: The invention relates to a motor vehicle pneumatic brake booster, comprising a casing (10) inside which a piston (20) formed from a rear tubular part (22) supporting a skirt (14) defines, with the aid of an unrolling membrane (12), a front chamber (16), permanently connected to a vacuum source and a back chamber (18) alternately connected to the front chamber (16) or to the atmosphere via a valve (40) actuated by a control rod (34) capable of bearing, by a plunger (32), on one of the faces of a reaction disk (58) securely fastened to a thrust rod (56), the valve comprising a valve element interacting via an active part (40) with a first valve seat (32a) formed on the plunger (32) and a second valve seat (20a) formed on the piston (20), the valve element (40) normally being stressed forward by an elastic element (44).

Abstract: The invention relates to a brake-booster comprising a casing (10) within which is found a piston structure which, with the help of an unrolling membrane (12), defines a front chamber (16) permanently connected to a partial vacuum source by a valve (17) and a back chamber (16) selectively connected to the front chamber (16) or to the atmosphere via a valve means (34) when a control rod (30) is actuated, and a device (36) for fastening the booster on a wall (38) adjacent to a first face of the casing (10). According to the invention, apertures (50, 60) are made in the piston structure (14) and in a second face of the casing (10) and are aligned in the axial direction of the booster so as to permit the actuation of the fastening device (36) through the aperture (60) made in the second face of the casing (10).

Abstract: The control assembly for a hydraulic circuit of a vehicle having an engine compartment and a passenger compartment which are separated by an apron (22) comprises:a vacuum booster (16) having one axis (18) and including:an actuating rod (20) projecting into the passenger compartment;a shell (14) which is intended to be fastened by its periphery to the apron (22) in the engine compartment and to which a master cylinder (10) is fastened; anda cover (26) closing the shell and bearing circumferentially on the apron (22) in the engine compartment,a pedal unit for actuating the booster, including at least one pedal (30) mounted on a lever (32), the pivot (34) of which is retained by a bearing piece (36) fixed to the cover.

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 invention relates to a brake servomotor assembly (1) consisting of a front half-shell (6) and a rear half-shell (8) and mounted on a stationary part (4, 40) of a vehicle by means of lugs (54, 56, 154) arranged in a plane perpendicular to the axis of the servomotor and around this axis, extending radially outwards and cooperating with bearing surfaces (34, 36, 134) with corresponding shapes and dimensions for mounting by mechanism of axial engagement followed by rotation, an elastic means (25, 125) being arranged between the servomotor (1) and the stationary part (4,40), the servomotor (1) having a central hub (24) on the rear half-shell (8) comprising a control valve mechanism (26) of the servomotor (1). The lugs (154) or the bearing surfaces (34, 36) are formed as a single piece with the central hub (24) and cooperate respectively with the bearing surfaces (134) or the lugs (54, 56) formed on the stationary part (4, 40) of the vehicle.

Abstract: A rigid partition (18) internally delimiting a front space and a rear space in the outer casing (10) of a brake servo unit is fastened on an approximately cylindrical extension (14a) of a reinforcing plate (14) internally lining the front portion of the casing. A two-stage servo unit of simplified construction and of small dimensions, utilizable in the brake circuit of motor vehicles, is thus obtained.

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 invention relates to a brake with at least one stationary disc (10) and one axially movable disc (33). The movable disc (33) is mounted on hangers (17), themselves each fixed to a cylindrical column (16) parallel to the axis of the wheel. This column can move axially on bearings (15) carried by an extension (8) of the hub. This extension is in the form of a fork, with two teeth set apart axially and located on either side of the plate (2) forming the body of the hub. Seals (22) make it possible to maintain a reserve of grease in the region of the bearings (15).

Abstract: Multiple disc brake comprising a first rotary disc fixed to a hub connected to a rotating member to be braked and at least one second rotary disc capable of sliding axially relative to the hub and to the first disc, while at the same time being made integral in terms of rotation with the first disc. The connection between the second disc (2) and the hub (3) is made by way of at least two axially sliding shoes (22) which are uniformly distributed over a circle and which are each accommodated in an axial receptacle (23) of a cross-section matching that of the shoe (22). The invention is used on a multiple disc brake for motor vehicles.

Abstract: The invention concerns a disc brake with a caliper (10) sliding on a fixed support (12) incorporating a first friction component (14) which is capable of being applied against a surface of a brake disc by way of a brake actuator through a plunger (28). A second friction component is capable of being applied against the other surface of the disc through the sliding caliper. Rotation of the plunger (28) is capable of causing the latter to move axially relative to the brake actuator. The disc brake incorporates an adjusting and retaining component (44) having a fork (40) at one of its ends (42) which is intended to cooperate with complementary surfaces (38) formed on the plunger (28) and having a hole (48) at its other end (46) by way of which the component (44) is immobilized, through a screw (50), relative to the first friction component (14).

Abstract: The braking system incorporates at least one brake disc disc (26 36) mounted so as to slide axially on a hub (22) along key mechanisms (30, 32). According to the invention the braking system incorporates an integral device for forced greasing (60) of the key mechanisms (30, 32) formed by two sealed chambers with variable volumes joined to one another by way of the key mechanisms (30, 32).

Abstract: The disc brake incorporates a sliding caliper (18) straddling a rotating disc, the caliper incorporating a first portion (24) sliding on a fixed support (10) by way of at least one axial pillar (20) and incorporating a second portion (28) of the caliper astride the disc. The second portion (28) is hinged to the first portion (24) along an axis of articulation (D) parallel to the plane of the disc and situated radially nearer to the axis of rotation (B) of the disc than the line of action (C--C) of the brake actuator, an abutment (56-58) is positioned between the first (24) and the second (28) portions and lies in a plane perpendicular to the plane of the disc and parallel to the axis of articulation (D).

Abstract: The invention relates to a multi-disc brake comprising a stationary rotary disc (1) and a moveable rotary disc (2) which is mounted on a splined sleeve (5) sliding on a splined part (3a) of a hub (3) of axis (4) and with which the disc (1) is solid. An assembly of friction pads (6 to 9) can interact with the discs (1,2) under the action of a hydraulic jack (13). The splines (23,25) of the hub and of the sleeve are protected from dirt by deformable diaphragms (20,26) which are turned in on themselves and which are arranged so as to be shielded from the thermal radiation emitted by the braking members (1,2,6 to 9).

Abstract: The servomotor incorporates a component (30) for retaining and for positioning the plunger (12) forming the moveable seat (11) for the valve means (9), the component (30) consisting of a plate incorporating a U-shaped central portion lying in a radial cavity (18) of the valve body (8) and cooperating with a shoulder (47) of the plunger (12), and a portion outside the valve body (8) pivoting about an axis Z carried by the valve body and having an end (42) coming into abutment, in the rest position, against a ring (43) mounted in the neck (21) of the casing (1).

Abstract: The disc brake incorporates a caliper (28) formed of two axially opposed beams (38, 40) and of two arms which are circumferentially spaced and which define a radial opening for the mounting/removal of friction components (56-62). The caliper incorporates a third arm (64) lying above the opening and mounted, so as to hinge about a shaft (68), on one (40) of the beams, members (66, 76, 78) being provided to join rigidly the third arm to the other (38) beam. An assembly is provided, for example an eccentric assembly, in the region of the shaft (68), to join the third arm to the caliper recovering the manufacturing tolerances of the brake.

Abstract: The braking system incorporates at least one brake disc (36) sliding on a rotating driving component (22) capable of being braked by way of friction components (44, 50). The sliding disc (36) is provided with a device for returning and memorizing a position (60) enabling the disc to be always at the same predetermined distance relative to one of the friction components (44) when the brake is not applied, irrespective of the state of wear of the friction component (44). Applicable to motor vehicle braking systems.

Abstract: The power-assistance servo-motor (8) supported on a first end (9) of the master cylinder (1) incorporates a moveable wall structure (13) connected to a valve body (20), located at the other axial end of the master cylinder, by two rigid conduits (26, 27) which extend radially on the outside of the pistons (4, 5) of the master cylinder (1) and which respectively make the valve (18) communicate with each of the chambers (13, 16) of the servo-motor (8), the conduits (26, 27) passing so as to slide in a leak-proof manner through the continuous rear wall (12) of the servo-motor (8).

Abstract: Quick assemblable master-cylinder and an assistance servo assembly. According to the invention, the master-cylinder (11) includes several lugs (12) while the end wall of the servo (14) is provided with a cut out (15a, 16a) similar in shape to the profile of a transverse section of the master-cylinder passing through said lugs.