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:
Aug. 08, 2000
Filed:
Apr. 14, 1999
Marvin L Bernstrom, Eden Prairie, MN (US);
Jarett D Millar, Minneapolis, MN (US);
Karen J Radford, Minneapolis, MN (US);
Ryan C Bergerson, Eden Prairie, MN (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A two-speed gerotor motor of the type having a stationary valve member (19) defining a plurality of stationary valve passages, each including an upstream passage portion for commutating fluid communication with a moveable valve member (43), and a downstream passage portion in continuous fluid communication with a volume chamber (33) of the gerotor gear set. In some of the stationary valve passages (113), the upstream (115) and downstream (117) passage portions are blocked from direct fluid communication. A control valve spool (89) has a first position (FIG. 8) permitting unrestricted fluid communication between the upstream and downstream passage portions, for normal low-speed operation. The control valve spool has a second position (FIG. 9) blocking communication between the upstream (115) and downstream (117) passage portions, and connecting all of the downstream portions together, communicating with a fluid accumulation region (91), such that fluid from those volume chambers recirculates, to provide a high-speed mode of operation.