摘要:
A proportioning valve assembly (10, 210) in a housing (12,212) is pressure responsive to control the flow of fluid to a wheel brake cylinder. The proportioning valve (20, 220) is connected to a fluid channel (31, 231) opening into a reservoir (13,213), a second valve (34, 234) being disposed in the channel (31, 231) and being engaged by an inertia sensitive ball (40, 240) located either on a ramp (17) or within a recess (235) of the second valve (234). The ball (40) is responsive to deceleration of the vehicle and moves up the ramp (17), or the ball (240) moves multi-directionally from the recess (235) to be both longitudinal and lateral deceleration responsive. Movement of the ball (40, 240) permits the second valve (34, 234) to close and prevent fluid communication between the fluid reservoir (13, 213) and the proportioning valve (20, 220) in order to vary the outlet pressure of the proportioning valve (20, 220) in response to deceleration or cornering of the vehicle. The proportioning valve (20, 220) includes a second piston (80, 280) which has a plunger end (82, 282) that extends within the channel (31, 231) and a bore (303) of a sleeve (301). The sleeve (301) has an orifice (307) to restrict fluid pressure flow from the bore (30) around the plunger end (282) and through the orifice (107, 307) to the channel (31,231). The sleeve (301), orifice (307), and plunger end (82, 282) provide damping of second piston when sudden high pressure applications occur, and thereby eliminate the occurrence of wheel lock-up.
摘要:
An adjustment assembly for a disc brake includes a nut (26) and a threaded stem (28). The threaded stem (281 defines a first diameter portion (72) and a second diameter portion (76) which cooperate to form a differential area sealingly engaging an inwardly extending partition. The partition also forms a passage (88) to cbmmunicate fluid pressure to both portions (72, 76) so that the differential area and pressure communicating passage are compactly arranged at the partition.
摘要:
Braking apparatus (28), comprising a master cylinder (40) for supplying pressurized fluid to the brakes of the vehicle, a hydraulic booster (42) for assisting the master cylinder to effect a brake application, a fluid pumping section (44) driven by an electric motor for supplying pressurized fluid to the hydraulic booster and a reservoir (46) supplying a single fluid to the various parts of the apparatus. The electric motor driving the fluid pumping section (44) receives energy from the vehicle only in response to a need for braking, and the braking apparatus includes a fluid pressure accumulator (147) providing pressurized fluid to the booster (42) during the first phase of a brake application, until the fluid pumping section (44) is able to supply a greater fluid pressure to the booster to achieve a second phase of brake application while simultaneously recharging the accumulator.