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:
Oct. 04, 2016
Filed:
Jul. 23, 2013
The Ritsumeikan Trust, Kyoto, JP;
Mori Kogyo Co., Ltd., Shizuoka, JP;
THE RITSUMEIKAN TRUST, Kyoto-Shi, Kyoto, JP;
MORI KOGYO CO., LTD., Shizuoka-Shi, Shizuoka, JP;
Abstract
A hydraulic drive circuit is provided that can achieve high responsiveness, high precision, and high efficiency at a low cost in a hydraulic drive system popularly used in an industrial machine such as a press machine, a construction machine, and the like. A hydraulic drive circuitsupplies pressured liquid discharged from a main hydraulic pump P to drive a hydraulic actuator, and includes a first valvearranged in a main flow linethat circulates pressured liquid discharged from the main hydraulic pump P to the hydraulic actuator, a second valveto return the pressured liquid flowing into one liquid chamber of the hydraulic actuatorand discharged from the other liquid chamber to a tank T, and a sub-hydraulic pumpthat is arranged between the main hydraulic pump P and the drive direction control valveand uses the pressured liquid flowing in a branched flow linebranched from the main flow lineto increase a pressure and a volume of the hydraulic liquid in the main flow lineby predetermined quantities, respectively.