摘要:
A pneumatic brake booster for a motor vehicle, comprising a piston (22) mounted between a control rod (24) actuated by a brake pedal and a push rod (34) actuating a piston of a brake master cylinder. Structure for increasing brake boosting during an emergency braking, comprising a cylindrical sleeve (46) mounted in an axially sliding and sealed manner inside the piston (22). The sleeve being retained in the rest position by locking arrangement (58) and released to push away the shutter (56) of a three-way valve and increase the supply of atmospheric air to the booster when the control rod (24) is moved at a speed that is greater than a predetermined value.
摘要:
This invention mainly relates to a reaction-disk device, to its manufacturing process and to a pneumatic servomotor for an assisted braking, including such reaction device.A reaction device according to the present invention comprises a receiving cavity, fitted with a reaction disk made of incompressible or substantially incompressible materials, comprising: a) an applying surface for the plunger (or a similar member, connected to a member, actuated by the driver, such as the brake pedal, and advantageously connected to at least one element of the three-way valve of a pneumatic assistance servomotor); b) an applying surface for the push rod (or a similar member for a force transmission to the master cylinder, more particularly a tandem master cylinder); and c) a surface with a resilient response to the working pressures exerted on the reaction disk, so as to be elastically deformable on braking or, at the very least, during an emergency braking operation. The present invention concerns, more particularly, the motor car industry.And the present invention mainly applies to the design and manufacturing of braking systems.
摘要:
A boosted brake (10) having a booster (12) for activating a primary piston (54) of a master cylinder (14) by way of a feeler (42), a reaction disk (28) and a push rod (52). The push rod (52) that is housed a decompression piston (62) and returned elastically by a spring (70) to a position of rest has at least two radial branches (64) in order to provide two boost ratios which differ according to the intensity of the input force.
摘要:
A master cylinder (10) having an axial body (12) with a bore (14) for receving a piston (16, 18), a front seal (26, 28) and a rear seal (30, 32) to delimit a rear supply chamber (34, 38) from a front pressure chamber (36, 40). A supply duct (42, 48) in the body (12) that connects a reservoir to the rear supply chamber (34, 38) has an opening between the front seal (26, 28) and the rear seal (26, 28). The front seal (26, 28) is mounted in a groove (110, 112) of the body (12) and has an interior lip that contacts the piston (16, 18) and lifts off the piston (16, 18) as the piston (16, 18) returns from a position of application to a position of rest to allow hydraulic fluid to be resupply the front pressure chamber (36, 40).
摘要:
A pneumatic servomotor for an assisted braking of a motor vehicle having a unidirectional clutch device (56). The clutch device (56) has a coaxial sleeve (58) that slides on a plunger (46), and a substantially ring-shaped key (60) that is arranged with a given clearance around the sleeve (58) and driven by a moving piston (22). When an input force is applied at a determined speed onto a control rod (38) that is integral with the plunger (46), the key (60) rocks and locks a finger (52) that biases the piston (22) with respect to the sleeve (58) in an axial position. The key (60) includes a peg (78) for axial indexing of the locking position of the sleeve (58).
摘要:
The invention relates to a master cylinder with hydraulic reaction, comprising a working chamber (12) in which there slides a hollow main piston (13) inside which a reaction piston (14) delimits a reaction chamber (15) which communicates with the working chamber (12) through at least one non-return valve (22). According to the invention, the non-return valve (22) is installed on a floating stepped piston (23) using the kind of assembly used in brake pressure regulators, so as to limit the reaction force applied to the reaction piston (15).
摘要:
A boosted braking device for a motor vehicle having a master cylinder (200) and a pneumatic booster (100). The master cylinder (200) is equipped with a primary piston (30) which receives an actuating force to increase pressure in a primary hydraulic circuit (I) which increases an increase in pressure in a secondary hydraulic circuit (II) and a secondary piston (31) which is subjected to the hydraulic pressure in the primary circuit (I). The pneumatic booster (100) is controlled by the application of an input force through which an actuation force is applied to the primary piston (30). The primary piston (30) has a hollow cylinder (200) the interior of which is in communication with the primary hydraulic circuit (I). A reaction piston (34) which slides in a leaktigth fashion inside of the hollow cylinder (200) urged toward the master cylinder by a first elastic force provided by a first elastic member (46). The hollow cylinder (32) has at least one opening (36) through which the interior thereof is in communication with the inside of the master cylinder (200). The hollow cylinder (32) includes a reaction piece (76) against which an end part (58) of the reaction piston (34) abuts to exert a force proportional to a force caused by the hydraulic pressure in the secondary circuit (II) exerted on the secondary piston (31) in the event of a failure of the primary hydraulic circuit(I).
摘要:
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.
摘要:
The distributor comprises a primary member, a secondary member coaxial with the primary member and having a part (3') at least partially surrounding a part (2') of the primary member, a distribution valve coupled to the primary member, and at least one deformable resilient device (4) having at least one pair of abutment surfaces (5) cooperating with the first (20) and second connection members connected to the primary and secondary members in order to hold them in a relative centered position of rest, the resilient device (4) being mounted so as to be sealingly slidable by opposite annular side faces in an annular cavity (32) formed in a member rotationally fixed to the secondary member and shaped to define in that cavity an internal chamber (6) and an external chamber (7), which are separate and whose volumes are inversely variable, means (8) being provided to direct a fluid under modulable pressure into at least one of these chambers.
摘要:
A pneumatic servomotor (12) for an assisted braking having a rigid axial casing (16) with a movable substantially truncated-cone shaped transverse skirt (18) that is integral with a piston (20) for the actuation of an associated master cylinder (14) that defines two pressure chambers (24, 26) inside the casing. A substantially annular sealing diaphragm (30) made of an elastomeric material is interposed between the casing (16) and an outer peripheral area (32) of the skirt (18) has a substantially annular seal (34) made of an elastomeric material is interposed between an inner area of the skirt (18) and the piston (20). The sealing diaphragm (30) and the seal (34) have a portion that is moulded over the skirt (18).