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:
Apr. 19, 2016
Filed:
Dec. 13, 2012
Kobelco Cranes Co., Ltd., Shinagawa-ku, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Hiroo Kondo, Hyogo, JP;
Takaharu Michida, Hyogo, JP;
Katsuki Yamagata, Hyogo, JP;
Naoto Hori, Hyogo, JP;
Naoya Kitazumi, Hyogo, JP;
Satoshi Maekawa, Hyogo, JP;
Naoki Sugano, Hyogo, JP;
KOBELCO CRANES CO., LTD., Shinagawa-ku, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Abstract
Provided is a hydraulic driving apparatus for a working machine, preventing an excessive decrease in pressure on a meter-in side and moving a load at a stable speed in a lowering direction. The apparatus comprises: a hydraulic pump; a hydraulic actuator; a manipulation device; a working hydraulic circuit including a meter-in flow passage and a meter-out flow passage; a control valve for changing a state of supply of hydraulic fluid to drive the hydraulic actuator at a speed designated by the manipulation device; a meter-in flow adjuster and a meter-out flow adjuster adapted to adjust a meter-in flow rate and meter-in flow rate respectively to respective value corresponding to the speed designated by the manipulation device; and a relief valve. The meter-in and meter-out flow adjusters have respective flow adjustment characteristics such that the meter-in flow rate is greater than the meter-out flow rate.