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:
Dec. 07, 2004
Filed:
Jun. 06, 2003
Michael W. Barto, Waconia, MN (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A method of controlling shifting of a multiple ratio fluid motor ( ) between first and second speed ratios. The motor includes a shift valve ( ) operable to achieve the second speed ratio by interconnecting recirculating volume chambers ( R). The method includes providing a pressure control valve ( ) in communication with a source ( ) of pressure fluid, the valve ( ) being operable to communicate a pilot pressure to the shift valve in response to changes in a command signal between a first signal ( B) and a second signal ( C). When a shift to the second condition is commanded, the method changes the command signal ( ) from the first to the second over a first time (T ). For a shift back to the first condition (FIG. ), the method changes the electrical command signal ( ) from the second to the first over a second time (T ), wherein T is greater than T