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:
Sep. 03, 2002
Filed:
Nov. 28, 2000
Jose Munoz, Brighton, MI (US);
Ingersoll-Rand Company, Woodcliff Lake, NJ (US);
Abstract
Direct drive variable displacement pumps that provide variable displacement wherein a swashplate pivots and changes the angle position in the direct drive variable displacement pumps. The swashplate is also capable of changing the stroke length of pistons in such direct drive variable displacement pumps and rotation of a rotating shaft is converted into axial or radial movement. In direct drive variable displacement pumps in accordance with the present invention, plungers and their respective plunger housings do not rotate relative to the rotating shaft while the swashplate rotates with rotating shaft. In addition, hydraulic control pistons are preferably used to change the angle of the swashplate and these hydraulic control pistons rotate with the rotating shaft. A first preferred embodiment of a direct drive variable displacement pump disclosed herein is an axial displacement type direct drive variable displacement pump while a second preferred embodiment of a direct drive variable displacement pump disclosed herein is a radial type direct drive variable displacement pump.