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. 06, 2017
Filed:
Oct. 22, 2014
Deere & Company, Moline, IL (US);
Dwayne A. Nystrom, Waterloo, IA (US);
Jesse R. Knight, Waterloo, IA (US);
Michael A. Holland, Conrad, IA (US);
Deere & Company, Moline, IL (US);
Abstract
A vehicle hydraulic system includes a transmission lube circuit, a variable displacement main pump having an inlet, and a variable displacement charge pump having an outlet and a pressure responsive displacement control unit. The system also includes a charge line communicating the charge pump outlet with the main pump inlet, a sensing line communicating the charge line with the displacement control unit, and a lube line communicating the charge pump outlet with the lube circuit. The lube line includes a fluid restriction. A hydraulic oil filter and a filter bypass valve are connected in parallel between the outlet of the charge pump and the charge line.