Hydraulic controller

Details Hydraulic controller Hydraulic controller

1979-02-22

1980-02-26

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60452, 60488, F16H 3946

Patent

active

041899210

ABSTRACT:
A hydraulic controller for a hydrostatic transmission to control a number of functions of a variable displacement pump or motor of the transmission. A valve includes a spool biased in one direction by a spring and in the opposite direction by fluid pressure in a chamber communicating with the charge pump. A variable orifice communicates the chamber with a drain. The size of the orifice is controlled electrically by a signal representative of swashplate position. Depending upon the pressure of the fluid in the chamber, the valve will directly vary the pressure ported from the charge pump to the standard controller. A needle roller has one end in contact with the end of the spool communicating with the chamber. A high pressure signal is provided via a shuttle valve across the high and low pressure conduits of the transmission to the other end of the needle roller. The control valve is thereby responsive to both pump displacement and the highest pressure within the transmission thereby making it a torque limiting controller. Various other modifications are described.

REFERENCES:
patent: 2516662 (1950-07-01), Vickers et al.
patent: 2976685 (1961-03-01), Thomas et al.
patent: 3152445 (1964-10-01), Weisenbach
patent: 3166891 (1965-01-01), Weisenbach
patent: 3411297 (1968-11-01), Hann

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