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. 07, 1978
Filed:
Jul. 06, 1976
Joachim Heiser, Stuttgart, DT;
Rainer Hoheisel, Aldingen, DT;
Heinz Flaschar, Asperg, DT;
Heinz Gand, Stuttgart, DT;
Heinz Kleinschmidt, Stuttgart, DT;
Konrad Braunlinger, Schwieberdingen, DT;
Klaus Sopha, Stuttgart, DT;
Roland Schempp, Abstatt, DT;
Hermann Sanzenbacher, Heimsheim, DT;
Robert Bosch GmbH, Stuttgart, DT;
Abstract
A hydraulic control system has a three-position valve which in its central position disconnects the high-pressure and low-pressure sides of a pressure source from outlet lines but connects these sides of the source together through a low-pressure valve. Moved to either of its end positions the valve is disconnected from between the sides of the pressure source and the output lines are connected to the high-pressure and low-pressure source sides. A pressure-limiting valve is connected between the sides of the source. In addition, the high-pressure side is connected via pressure-reducing valve and a restriction to a pair of pilot valves which are in turn connected to the low-pressure side. These pilot valves are also connected to opposite chambers of a pilot cylinder that controls the valve body. The pressure-reducing valve between the pilot valves and the high-pressure side maintains a medium-pressure level in the system when the valves move from its central position.