Pressure piloted release valve

Details Pressure piloted release valve Pressure piloted release valve

1990-07-19

1991-09-10

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

137508, 303119, 303 69, 303 841, B60T 832

Patent

active

050467883

ABSTRACT:
A pressure piloted release valve (80) is disposed within an adaptive braking system (10) having shuttle valves (34, 44, 54, 64). The release valve (80) provides for a quick release of fluid pressure buildup within the adaptive braking system (10) so that an associated shuttle valve (34, 44, 54, 64) will return to a normal braking position and cease restricting fluid flow with an associated wheel brake (30, 40, 50, 60). The release valve (80) includes a differential area release valve (100) received with a valve body (83) having a stepped bore (90). The valve body (83) includes a frustoconical-shaped body chamber (120) with a radial passage (124) such that displacement of the release valve (100) results in a second end (105) of the release valve (100) engaging sealingly a sloped end wall (102) of the body chamber (120) to prevent fluid flow through a longitudinal through passage (101) of the release valve (100) to a receptacle chamber (85) via the radial passage (124). The valve body (83) includes a poppet check valve passage (123) that communicates with the body chamber (120). A poppet check valve (130) normally permits fluid communication through the longitudinal through passage (101) to a receptacle end opening (84), and fluid pressure received at the receptacle end opening (84) causes the check valve (130) to close. When fluid pressure received from a master cylinder (12) and communicated with a first end opening (88) of the valve body (83) is terminated, the release valve (100) shuttles open very quickly and allows the fluid pressure at the receptacle end opening (84) to be communicated quickly to the master cylinder (12).

REFERENCES:
patent: 2839078 (1958-06-01), Lornitzo
patent: 4596265 (1986-06-01), Goodell
patent: 4887638 (1989-12-01), Hellquist et al.
patent: 4962975 (1990-10-01), Kervagoret
patent: 4971400 (1990-11-01), Jonner

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