Fluid-pressure and analogous brake systems – Releasing – Motor
Patent
1996-07-18
1998-07-14
Young, Lee W.
Fluid-pressure and analogous brake systems
Releasing
Motor
303 3, 303 15, 188170, B60T 1546
Patent
active
057793255
ABSTRACT:
A fluid control circuit (10) for operation of a brake comprises a first circuit part (11) including an actuator (12) having a chamber (13) and an operating part (14), the operating part (14) being movable to release or apply the brake when fluid under an operating pressure is fed to the chamber (13), an arrangement (17) to expel fluid from the chamber (13) when the operating pressure is released, thus to apply or release the brake, a second circuit part (18), a control valve (20) operable in a first condition to permit fluid to pass under the operating pressure to the chamber (13) of the actuator (12) in the first circuit (11) part and when in a second condition to permit fluid to pass from the first circuit part (11) into the second circuit part (18), the second circuit part (18) further comprising a buffer (23) to which fluid pressure is communicated from the first circuit part (11) when the control valve (20) is moved to its second condition, and a proportional fluid valve (30) to control the flow of fluid passing to tank (31) from the second circuit part (18) in dependence upon the pressure of fluid in the second circuit part.
REFERENCES:
patent: 4120540 (1978-10-01), Devlieg
patent: 5401086 (1995-03-01), Nishikimi et al.
Twiflex Limited
Young Lee W.
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