Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1985-01-22
1986-02-25
Jordan, Charles T.
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60443, 60465, F16H 3946
Patent
active
045719403
ABSTRACT:
A control device for a hydrostatic gear driven by a drive engine, such as an internal combustion engine, with an auxiliary pump which is driven synchronously with the drive engine, to produce a control pressure which is adjustable via a control valve and which is dependent on the speed of the drive engine. The control device also has further a pressure reduction valve located in the control line, to remove or shut off the control pressure depending upon an external parameter. In order to make possible, with such a control device, both a partial pressure reduction and a complete pressure reduction by hydraulic means without the aid of sensitive control rods, it is proposed in this invention that the pressure reduction valve have a servo valve spool which is adjusted by the external parameter.
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patent: 4168612 (1979-09-01), Nikolaus
Hydromatik GmbH
Jordan Charles T.
Klein Richard
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