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:
Jul. 19, 2016
Filed:
Aug. 01, 2013
Caterpillar Inc., Peoria, IL (US);
Keith Edward Lawrence, Peoria, IL (US);
John James Krone, Peoria, IL (US);
Nick William Biggs, Princeville, IL (US);
Karl Arthur Kirsch, Chillicothe, IL (US);
Yuya Kanenawa, Hyogo-ken, JP;
Tetsuya Yoshino, Hyogo-ken, JP;
Magomed Gabibulayev, Dunlap, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
In order to avoid cavitation in a boom cylinder head end at the beginning of a dig cycle, fluid from an alternate source is supplied to the head end before or in addition to fluid supplied by the main boom-up hydraulic circuit. In one embodiment, an electronic hydraulic valve, related sensors, and control system determines the beginning of a dig operation and uses fluid at an intermediate pressure to rapidly provide fluid to a boom head end cylinder to prevent voiding or cavitation before fluid under high pressure from the main pump can be brought to the cylinder. An on/off fluid switch is activated early in a dig operation to address low pressure at the boom cylinder head end and provide an alternate path for fluid into the cylinder in reaction to the boom being lifted by a motion of the stick and bucket in contact with the work surface.