US Patent 7509948 Variable displacement pump with an anti-stiction device

Patent 7509948 was granted and assigned to Caterpillar Inc. on March, 2009 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Caterpillar Inc.

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7509948

Date of Patent

March 31, 2009

Patent Application Number

11865523

Date Filed

October 1, 2007

Patent Primary Examiner

‌

Thomas N. Moulis

Patent abstract

A spacer for use with, and to prevent or reduce the occurrence of stiction in, a fluid device such as a pump. The spacer has a generally ring-shaped body, which has first and second facing surfaces separated by a thickness. The spacer is positioned between a movable member of the pump and a stationary member of the pump such that the first facing surface of the spacer is contactable with the movable member and the second facing surface is contactable with the stationary member. The spacer has at least a fluid receiving groove formed in at least one of the first and second facing surfaces.