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:
Mar. 21, 2017
Filed:
Feb. 05, 2013
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Shinya Imura, Tokyo, JP;
Hidetoshi Satake, Ishioka, JP;
Kouji Ishikawa, Tsuchiura, JP;
Seiji Hijikata, Tsuchiura, JP;
Tomoaki Kaneta, Tsuchiura, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
Provided is construction machinery that is capable of greatly reducing the amount of fuel consumption by making effective use of recovered energy. The construction machinery has a first hydraulic pumpfor discharging hydraulic oil for driving an actuator, a second hydraulic pump, a second prime moverfor driving the second hydraulic pump, energy storage devicefor storing energy for driving the second prime mover, and a hydraulic oil supply circuitincluding a hydraulic oil switching sectionthat accepts the hydraulic oil discharged from the first hydraulic pump and the hydraulic oil discharged from the second hydraulic pump and supplies either the mixture of the accepted hydraulic oils or a selected one of the accepted hydraulic oils to the actuator. The construction machinery includes a control devicethat, when the drive efficiency of the second hydraulic pumpand/or the amount of energy stored in the energy storage deviceis higher than a preselected setting value, outputs a switch command to the hydraulic oil switching sectionand outputs a drive command to the second prime mover