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:
Jul. 24, 1984
Filed:
Nov. 24, 1981
Alfred Krusche, Johannesberg, DE;
Linde Aktiengesellschaft, Hollriegelskreuth, DE;
Abstract
A hydrostatic drive system consisting of at least two component systems is provided, each component consisting of an adjustable pump, where the loading of the pump adjusting cylinder is regulated by a hydraulically controlled servo control valve, one side of which is acted upon by the delivery pressure of the associated pump and the other side is acted upon through a control pressure line by pressure beyond the metering restrictor, the improvement comprising a coupling valve to which all delivery lines and all the control pressure lines are connected, each through a branch connection line wherein the said valve in the closed position shuts off all the branch connection lines and in the open position connects all the delivery lines together and all the control pressure lines together and is hydraulically controlled, a first pressure chamber on one side of said valve to which each delivery line is connected, a valve element in said pressure chamber being loaded with a pretensioned spring on said first chamber, and a second pressure chamber on the other side of said valve element to which each control line is connected, the said two pressure chambers assigned to one component system being of the same size on both sides of the valve element and the open position of the valve element being set when a pressure gradient prescribed by the pretensioning between the delivery line and the control pressure line is no longer reached.