Control device for a hydrostatic gear driven by a drive engine

Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...

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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: 3850272 (1974-11-01), Reinecke et al.
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patent: 3977424 (1976-08-01), Patton
patent: 3986357 (1976-10-01), Hoffmann
patent: 4059042 (1977-11-01), Bridwell et al.
patent: 4168612 (1979-09-01), Nikolaus

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