Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1986-10-29
1988-07-12
Look, Edward K.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60452, 60488, F16D 3102
Patent
active
047561572
ABSTRACT:
A control circuit for a reversible hydrostatic transmission including a reversible pump having first and second working lines, and a control member having forward and reverse positions to normally direct a working fluid through the first and second working lines respectively. A servo-motor has forward and reverse positions to hold the pump control member in either its forward or reverse positions, and a first subcircuit is provided to conduct a control fluid to the servo motor to hold that motor in either its first or second positions. This first subcircuit includes a pair of piston and cylinder units, with each of these units having a control pressure chamber and a working pressure chamber. A second subcircuit is provided to conduct the working fluid from the working lines to the working pressure chamber of either the first or second piston cylinder unit, and this second subcircuit includes a change over valve to insure that the working pressure is maintained in the appropriate working pressure chamber even if there is a sudden reversal in the load on the pump.
REFERENCES:
patent: 3999387 (1976-12-01), Knopf
patent: 4292805 (1981-10-01), Acheson
patent: 4600364 (1986-07-01), Nakatani et al.
patent: 4627238 (1986-12-01), Mayr et al.
Hydromatik GmbH
Look Edward K.
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