The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 25, 1986
Filed:
Jan. 22, 1985
Johann Wuchenauer, Bibertal, DE;
Hydromatik GmbH, Elchingen, DE;
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.