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:
Jun. 30, 1987
Filed:
Feb. 06, 1986
Johann Merz, Schwabisch Gmund, DE;
Zahnradfabrik Friedrichshafen, AG., Friedrichshafen, DE;
Abstract
A pump is constructed using a magnetic piston in a cylinder having an oil feed thereto, for pumping oil to either pressure chamber of a steering servomotor. The pump cylinder has a chamber on each side of the pump piston which chambers discharge pressure oil into a respective servomotor chamber. The magnetic piston is actuated by an electromagnetic system under control of a manually operated steering wheel. The pump construction is such that the length of traverse of the pump piston on a pressure movement is shorter than the piston traverse of a servomotor chamber being pressurized. The pump chambers discharge directly into respective servomotor chambers without the need for steering control valving.