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:
Jun. 30, 2009
Filed:
Mar. 07, 2006
Dwayne Alan Nystrom, Waterloo, IA (US);
David Leo Sigl, Waterloo, IA (US);
Brian Daniel Durbin, Waverly, IA (US);
Scott E. Davison, Cedar Falls, IA (US);
Reno Antonio Rodeghiero, Hudson, IA (US);
Dwayne Alan Nystrom, Waterloo, IA (US);
David Leo Sigl, Waterloo, IA (US);
Brian Daniel Durbin, Waverly, IA (US);
Scott E. Davison, Cedar Falls, IA (US);
Reno Antonio Rodeghiero, Hudson, IA (US);
Deere & Company, Moline, IL (US);
Abstract
A vehicle hydraulic system includes a lube circuit, a pump supplying hydraulic fluid from sump to first and a second hydraulic control circuits and a filter circuit. The filter circuit includes a first outlet connected to the lube circuit, a sump line, and a second outlet connected to the pump. A suction filter is connected between the sump line and second outlet. A return filter is connected to the first control circuit outlet. A return line having an orifice is connected between the return filter and the first outlet. A backpressure valve has a member, an outlet connected to the second outlet, and an inlet and pilot line connected to the return filter outlet. A pressure sense line has one end connected to the return line between the orifice and the first outlet, and a second end connected to the member in opposition to the pilot line.