Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1992-09-28
1993-08-17
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60465, 60468, 60489, 91498, F16D 3300
Patent
active
052358100
ABSTRACT:
A valve mechanism for a hydrostatic transmission having a variable displacement pump and a motor in fluid communication with each other via a closed-loop fluid system. The valve mechanism provides pressure relief and a wide neutral feature within a predetermined range of movement about a zero displacement or neutral position of the pump. The valve mechanism is variably controlled by and in coordination with the movement of the displacement pump control mechanism from a fully open position through a fully closed position, such that as the pump is shifted into and out of neutral from both a forward and reverse displacement position, the valve mechanism is moved therewith. The valve mechanism constitutes a ring surrounding the conduit and is responsive to the pump control mechanism so as to move concentrically therewith. The ring valve includes bores selectively communicating with respective bores in the fluid system such that the fluid system is in selective communication with a cavity formed in the housing. The bores provide a metered leak path from the fluid system within 3.degree. of neutral in either the forward or reverse displacement positions upon actuation of the pump control mechanism into the same displacement position so as to reduce the pressure within the fluid system during engagement of the transmission. Movement beyond 3.degree. completely closes the valve such that full pressure may be developed within the fluid system.
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Look Edward K.
Lopez F. Daniel
Tecumseh Products Company
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