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:
Sep. 24, 2013
Filed:
Jul. 18, 2007
Yoshiyuki Shimada, Kobe, JP;
Hiroyasu Nishikawa, Kakogawa, JP;
Masaru Mishima, Akashi, JP;
Yutaka Yokoyama, Akashi, JP;
Yoshiyuki Shimada, Kobe, JP;
Hiroyasu Nishikawa, Kakogawa, JP;
Masaru Mishima, Akashi, JP;
Yutaka Yokoyama, Akashi, JP;
Caterpillar Japan Ltd., Tokyo, JP;
Abstract
A hydraulic control circuit includes a hydraulic cylinder, a control valve, a recovery oil passage, a hydraulic pump, an engine rotation speed setting unit, a recovery control valve, and a controller that reduces an engine rotation speed to not more than a preset reduction control engine rotation speed when the load is lowered; and adjusts an increase or decrease in an opening amount of the recovery control valve in accordance with a level of the target rotation speed set by the engine rotation speed setting unit.