Abstract: A boosted braking device for a motor vehicle having a master cylinder (200) and a pneumatic booster (100) operated by applying an input force to an operating rod (26). The booster (100) has a rigid casing (10) which is divided by a partition (16) into at least first (12) and second (14) leaktight chambers. The partition (16) is acted upon via a difference in pressure between the first (12) and second (14) chambers on the opening of a three-way valve (24) to allow pressurized fluid to be communicated to the second chamber (14). A main hydraulic piston (30) which is located in the master cylinder (200) has a hollow cylinder (32) which is in communication with an interior volume (V) of the master cylinder (200). A secondary hydraulic piston (34) slides in a leaktight fashion inside of the hollow cylinder (32).

Abstract: A pressure-regulating solenoid valve (100) for a hydraulic circuit having at least one generator (300) of pressurized fluid, a pressure receiver (200) and a reservoir (400) of fluid under low pressure. The solenoid valve having an electric coil (10) which interacts with first (12) and second (14) pole pieces and a magnetic body (26). The magnetic body (26) moves under the effect of an actuating force (O) generated by a magnetic field created by the electric coil (10) and a distributor element (30) interacting with a sleeve structure (28) to command communication between a duct (66) connected to the pressure receiver and one of first (54) and second (42) ducts sequentially connected to the generator (300) of pressurized fluid or the reservoir (400) of fluid under low pressure.

Abstract: A drum brake (10) having first (14) and second (16) brake shoes retained on a backing plate (20) and moved into engagement with a drum (18) to effect a brake application corresponding to a desired braking input supplied to a actuator member (28) is disclosed. The actuator member (28) has a housing (50) with a first bore (54) therein connected to a cross-bore (56). A pinion (58) located in the first bore (54) has a shaft with first end (60) and a second end (62). The shaft has teeth (58) thereon adjacent the first end (60) and a gear (64) connected to the second end (62). First (74) and second (76) racks which are located in the cross-bore (56) have teeth (67,67') thereon which mesh with the teeth (68) on the pinion (58). A first linkage member (28) connects the first rack (74) with the first brake shoe (14) while a second linkage member (28') connects the second rack (76) with the second brake shoe (16).

Abstract: A master cylinder comprising a cylindrical body (1) which points along a main axis (X). The cylindrical body (1) has a free end (11) and an attached end (12) with a piston rod (2) extending axially from the attached end (12). An impact deflector (3) removably mounted on the cylindrical body (1) covers the free end (11). The impact deflector (3) has at least one deflecting surface (D) which is inclined obliquely to the main axis (X).

Abstract: A disk brake for a motor vehicle having a caliper (1), a carrier (2) which fixed to the vehicle and a pad (41) located between a tip (10) on the caliper (1) and a disk (D). The pad (41) being fitted with a spring (5) which holds the pad against the tip (10) of the caliper (1). The spring (5) bears elastically on inclined surfaces of the tip (10) of the caliper (1) and is subjected to a torque (C--C) which urges the spring (5) to rotate about an axis (X) and to continually urge the spring (5) against the carrier (2).

Abstract: A pneumatic brake booster comprising two working chambers, with each working chamber communicating a respective one of two reaction chambers. A divider dividing the reaction chambers provides a pressure feedback force to an input shaft. A selective valve (13) allows communication (C2) provided between the rear working chamber and the front reaction chamber to be closed, at least partially, when an airflow from the rear working chamber towards the front reaction chamber is higher than a predetermined amount. This allows the response time of the booster is adjusted.

Abstract: A pneumatic booster utilizing first and second sources of air pressure and having a rigid casing (1) divided by a leaktight moving partition (2) into at least first and second working chambers (T1,T2). The moving partition (2) being urged by a pressure difference between the pressures supplied to the first and second working chambers (T1,T2) brought about by actuation of a three-way valve (5). The three-way valve (5) being retained in a pneumatic piston (4) carried by the moving partition (2). The moving partition (2) having a rigid skirt (3) including first and second walls (31,32) to define a fixed volume (V). The fixed volume being split into first and second reaction chambers (R1,R2) by a divider (11). The divider (11) constituting, within the booster, a reaction member intended to oppose an input force for actuating the three-way (5) to actuate the booster and develop an output force for the booster.

Abstract: A mechanical actuator (40) for a disc brake assembly (10) to effect a parking brake application. The mechanical actuator (40) includes a housing (62) for retaining an end plate (56) which is rotationally retained in a bore (60) and connected to an end plate (48) which is axially retained in the bore (60). End plate (56) is connected to end plate (48) by a plurality of pivotal connecting rods (50,52,54). The connecting rods (50,52,54) each have an end retained in indentations (74,76,78) in end plate (56) and indentations (75,77,79) in end plate (48). An input applied by lever (46) causes end plate (48) to rotate about an axis (70) of bore (60) and connecting rods (50,52,54) to pivot about indentations (74,76,78) and since end plate (56) is rotationally restrained the force from connecting rods (50, 52,54) is translated into an axial force component which moves end plate (56). The force component varies as a function of angle of rotation of end plate (48).

Abstract: A hydraulic pressure generator having a body (1) with a first bore (11) therein for receiving a cylinder (21) of a piston assembly (2) to define a pressure chamber (12). The cylinder (21) has a second bore (211) for receiving an auxiliary piston (22) which defines a variable volume compensation chamber (23). The compensation chamber encloses a deformable member (5) which is adapted to exert an elastic force between the auxiliary piston (22) and a closed end (210) of cylinder (21). The compensation chamber (23) communicates with the pressure chamber (12) through a restriction (221) formed in a longitudinal duct (222) of the auxiliary piston (22). A sealing member (4) borne by a portion (222) of the auxiliary piston (22) closes the pressure chamber (12) such that the elastomeric member (5) dampens pressure differences between the pressure chamber (12) and compensation chamber (23).

Abstract: The brake booster has an envelope (10) with an axis of symmetry (X-X') separated sealingly by at least one movable partition (12) to define at least a first chamber (14) connected permanently to a source of low pressure and at least a second chamber (16). The second chamber (16) being selectively connected to the first chamber (14) or a source of high pressure through a three way valve structure actuated by a control rod (30,130). The three way valve structure has a plunger (28,128) which slides in a bore (26,126) of a piston (20,90) is connected to a control rod (30,130). The position of the plunger (28,128) in bore (26,126) selectively controls the communication between the first chamber (14) and the second chamber (16) or communication between the second chamber (16) and the source of high pressure.

Abstract: A brake system (10) having a proportioning device (18) through which a first fluid pressure is communicated to a first brake circuit and a second fluid pressure is communicated to a second brake circuit. The proportioning device (18) has a housing (90) with a first bore (204) connected with a first passage (98) for receiving the first fluid pressure and with a second passage (100) for receiving the second fluid pressure. A first piston (210) located in the first bore (204) of the housing (90) separates the first passage (98) from the second passage (100). The first piston (210) responds to a higher fluid pressure of the first and second fluid pressures by moving in the first bore (204) to providing additional fluid pressure to a lower fluid pressure of the first and second fluid pressures to substantially equalize the first and second fluid pressures supplied to the first and second brakes circuits for effecting said brake application.

Abstract: A tandem brake booster having a housing with a first front chamber separated from a first rear chambers by a first wall and a second front chamber separated from a second rear chamber by a second wall. The first and second front chambers are connected to the first and second rear chambers through passages in a hub which retains a control valve. In a first or ready mode of operation, the first and second front and rear chambers have a substantially identical first fluid pressure while in a second or actuation mode of operation, the control valve responds to an input force to allow a second fluid pressure to be communicated to the first and second rear chambers and create a pressure differential with the first fluid in the first and second front chambers. The pressure differential develops an output force which moves the first and second walls as a function of the input force applied to the control valve.

Abstract: A pneumatic brake booster having a casing (10) with an axis of symmetry (X-X') and divided in leaktight fashion by a movable wall structure (12,20) into a front chamber (14) and a rear chamber (16). The front chamber (12,20) is permanently connected to a source of partial vacuum while the rear chamber (16) is connected selectively to the front chamber (14) or to the outside atmosphere by a three-way valve (36). The three-way valve is actuated by a plunger (28) which slides in a bore (26) of the movable wall (12, 20) in response ton an input applied to an axial control rod (30). The three-way valve (36) is located in a rear tubular part (22) of the movable wall structure (12, 20) which projects outside of the casing (10) and including a valve element (36). Valve element (36) interacts via a first annular surface (A) with a first valve seat (28a) formed on the plunger (28) and via a second annular surface (B) with a second valve seat (20a) formed on the movable wall (20).

Abstract: A pneumatic brake booster (1) having a piston (5) which is responsive to first and second sources of air pressure. The booster (1) has a rigid casing (3) which is divided by a leaktight movable partition (4) into first (3a) and second (3b) chambers. The partition (4) including a pneumatic piston (5) which carries a control valve (7). A difference in pressure established between the first (3a) and second (3b) chambers causes the piston (5) to move within the casing (3). The inside (50) of the piston (5) is separated from the second source of air pressure by an impurities filter (14). A closing-off means (15,17) is located between an opening to the inside (50) of the piston (5) and the second source of air pressure to control an air inlet path which bypasses the impurities filter (14).

Abstract: A vacuum brake booster having sound absorbing members affixed to the front and rear shells to attenuate sounds caused by air movement in the brake booster. The front shell is joined to the rear shell to define the housing for the brake booster. The housing is divided into a first chamber and a second chamber by a wall structure. The first and second chambers in a first mode of operation are designed to be in communication with a first source of fluid (vacuum) having a first fluid pressure while in a second mode of operation the second chamber is in communication with a second source of fluid (atmospheric air) at a second fluid pressure. In the second mode of operation, a pressure differential is created across the wall structure to produce an output force corresponding to an input force associated with a desired braking application.

Abstract: A pneumatic booster (1) having casing (3) divided by a movable partition (3) into first (3a) and a second (3b) working chambers. The movable partition (4) being urged by a pressure differential derived from a first fluid pressure in the first working chamber (3a) and a second fluid pressure in the second working chamber (3b). The second fluid pressure is communicated to the second working chamber (3b) through the actuation of a shutter (70) by means of a plunger (8). The shutter (70) has freedom of movement with respect to the plunger (8) while being elastically urges against the plunger (8). The shutter (70) is connected to a mass (15) which is set in motion by a movement of the plunger (8). The mass (15) thereafter acts on and moves the shutter (70) away from the plunger (8) to increase the flow of the second fluid pressure to the second chamber (3b).

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 pneumatic brake booster for a motor vehicle having a rigid casing (1) with a first shell (10) which points toward the front of the vehicle and a second shell (11) which points toward the rear of the vehicle. At least one through bolt (5) fastened to the front shell (10) and rear shell (11) by respective cohesive forces which joins the front shell (10) to the rear shell (11) in an axial direction by a compressive force which tends to pull the front shell (10) toward the rear shell (11). The cohesive force between the through bolt (5) and the front shell (10) wholly consists of an elastic force exerted by the rigid casing (1) on the through bolt (5) in reaction to the compressive force exerted on the front shell (10) and rear shell (11) by the through bolt (5). The through bolt (5) has a threaded end (50) which passes through the front shell (10).