Hydrostatic transmission and relief valve therefor

Details Hydrostatic transmission and relief valve therefor Hydrostatic transmission and relief valve therefor

1991-08-29

1992-08-11

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60489, 60494, 137491, 13750513, F16D 3102

Patent

active

051368455

ABSTRACT:
A hydrostatic transmission is provided of the type including a pump (15), a motor (17), and a pintle assembly (35) defining high (61) and low (63) pressure fluid conduits. In communication with the conduits, the pintle assembly includes a pair of acceleration valves (85, 89), each of which comprises a differential area piston. Adjacent each acceleration valve is a pilot valve means (95) disposed in a pilot bore (105) and including a valve member (115) operable, in response to system pressure in excess of the pressure relief setting of a spring (117) to relieve fluid pressure in a chamber (101), such that the acceleration valve (85) is biased toward an open position (FIG. 5) relieving fluid pressure spikes from the high pressure conduit (61) to the low pressure conduit (63).

REFERENCES:
patent: 3199297 (1965-08-01), Croswhite
patent: 3704588 (1972-12-01), Trabbic
patent: 3906993 (1975-09-01), Adams et al.

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