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:
Oct. 02, 2007
Filed:
May. 25, 2006
Bruce D. Larkin, Plainwell, MI (US);
Joseph A. Kovach, Aurora, OH (US);
Matthew H. Simon, Kalamazoo, MI (US);
Eric B. Chapman, Brea, CA (US);
Dan T. Nguyen, Irvine, CA (US);
Bruce D. Larkin, Plainwell, MI (US);
Joseph A. Kovach, Aurora, OH (US);
Matthew H. Simon, Kalamazoo, MI (US);
Eric B. Chapman, Brea, CA (US);
Dan T. Nguyen, Irvine, CA (US);
Parker-HannifinCorporation, Cleveland, OH (US);
Abstract
In a variable displacement type hydraulic pump/motor assembly including at least one internally movable component, such as a yoke, a swashplate, and the means for moving the swashplate, the improvement includes imparting on this component absolute location indicia markings and the addition of an optical/electronic sensor unit capable of reading such indicia markings fixedly located on a housing of the pump/motor assembly and including an optical read head extending into the housing interior and located at a spaced distance from the indicia markings for reading same, relative to a reference location, and producing a signal indicative of the absolute position of the movable component. The signal can then, in turn, be used for controlling the displacement of the pump/motor assembly. A method for determining the absolute component position is also set forth.