Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1986-10-03
1988-06-21
Wayner, William E.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
91448, 192 85R, F01B 300, F16D 1900
Patent
active
047518669
ABSTRACT:
Fluid systems for controlling clutch engagement normally have modulating pressure relief valves to aid in smooth clutch engagement. It is also desired in such systems to ensure that the system pressure is reduced to a low level so that the load piston is fully reset prior to initial engagement of the newly filled clutch. In this arrangement, in order to ensure that the load piston is fully reset, a mechanism is provided which establishes a ratio between the pressure of the fluid being directed to the clutch and the pressure of the fluid acting on the load piston of the modulating pressure relief valve so that the pressurized fluid acting on the load piston during the filling of the clutch is vented to the reservoir to reset the load piston even though the pressure of the fluid available to the clutch is still at a higher pressure level. The ratio valve mechanism is located within the valve spool of the modulating pressure relief valve thus providing a simple and compact valve mechanism which reduces the total system size and further eliminates additional conduits and/or lines.
REFERENCES:
patent: 3566716 (1971-03-01), Chatterjea
patent: 3799308 (1974-03-01), Erisman
patent: 4046160 (1977-09-01), Horsch
patent: 4132302 (1979-01-01), Chatterjea
patent: 4676348 (1987-06-01), Coutant
patent: 4676349 (1987-06-01), Coutant
Burrows J. W.
Caterpillar Inc.
Wayner William E.
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