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:
Dec. 11, 2007
Filed:
Mar. 13, 2003
Edwin Harnischfeger, Jossgrund, DE;
Erhard Bergmann, Mirow, DE;
Walter Scandella, Bergamo, IT;
Vincenzo Domenico Bollero, Rivarolo Canavese, IT;
Edwin Harnischfeger, Jossgrund, DE;
Erhard Bergmann, Mirow, DE;
Walter Scandella, Bergamo, IT;
Vincenzo Domenico Bollero, Rivarolo Canavese, IT;
Bosch Rexroth AG, Stuttgart, DE;
Abstract
A hydraulic steering apparatus with steering amount amplification is provided, wherein a metering device for supplying pressure medium to steering cylinders is actuated in accordance with an amount of rotation of the steering wheel. With the aid of a control block it is possible to deliver an additional pressure medium volume to the steering cylinders, wherein control of the control block is effected through the intermediary of a control circuit containing an effective control pressure that is substantially lower than the load pressure for transmitting the steering moment at the steering cylinder. A spring assembly for the control block is also provided, wherein two springs are arranged in parallel, one of which only takes effect following a predetermined stroke of the control element.