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. 03, 2013
Filed:
Oct. 06, 2009
Applicant:
Hongliu Du, Naperville, IL (US);
Inventor:
Hongliu Du, Naperville, IL (US);
Assignee:
Caterpillar Inc., Peoria, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B 13/044 (2006.01); E02F 9/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
A control system for a variable displacement hydraulic pump is disclosed. The control system utilizes two flow control valves to provide a flow of hydraulic fluid to two control actuators. The control actuators create opposing moments on the pump swashplate to control swashplate orientation and pump displacement.