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:
Apr. 29, 2003
Filed:
Jul. 09, 2001
Carsten Fiebing, Jevenstedt, DE;
Reinhardt Thoms, Neumunster, DE;
Sauer-Danfoss Inc., Ames, IA (US);
Abstract
A hydrostatic variable displacement pump has a swash plate ( ), which is used to adjust the stroke of displacement pistons in a cylinder block. The swash plate has its angle position pivoted in relation to the stroke direction of the displacement pistons by means of a servosystem. The servosystem is fitted on the housing ( ) of the variable displacement pump. The servosystem ( ) has a pressure cylinder ( ) and a servopiston ( ), which together form a servocylinder pressure chamber ( ). The servopiston ( ) operates in the pressure cylinder ( ), is subjected to compressive loading by means of a spring assembly ( ) and has a piston with at least two servopiston surfaces ( ) subjected to the action of pressure.