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. 03, 2019
Filed:
Jul. 31, 2015
Kobe Steel, Ltd., Hyogo, JP;
Naoki Sugano, Kobe, JP;
Kobe Steel, Ltd., Hyogo, JP;
Abstract
A hydraulic drive apparatus includes: an accumulator for receiving hydraulic fluid discharged from a hydraulic actuator during a lowering drive; an accumulator flow regulator capable of changing a flow rate of hydraulic fluid to be introduced to the accumulator from a closed circuit; a regeneration actuator for converting energy of the hydraulic fluid accumulated in the accumulator into motive force; a regeneration selector valve interposed between the accumulator and the regeneration actuator; a pump control section for limiting a pump discharge flow rate during the lowering drive; and a speed control section for operating the accumulator-flow-rate regulator so as to bring an actuating speed of the hydraulic actuator close to a target speed during the lowering drive.