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:
Jan. 09, 2018
Filed:
May. 20, 2014
Hitachi Construction Machinery Co., Ltd., Bunkyo-ku, Tokyo, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
To provide construction machinery capable of more efficiently utilizing the energy of return hydraulic oil from a hydraulic actuator. The present invention is provided with: an engine; a hydraulic pumpthat is driven by the engine; a hydraulic actuatorthat is driven by fluid discharged from the hydraulic pump; a discharge pressure sensorthat detects the discharge pressure from the hydraulic pump; a hydraulic regenerative motorthat is driven by the return hydraulic oil from the hydraulic actuator; a flow meterthat detects the flow rate of the return hydraulic oil; a flow dividing valvethat controls the rate of inflow to the hydraulic regenerative motor; a controllerthat controls the flow dividing valveaccording to the discharge pressure detected by the discharge pressure sensorand the flow rate detected by the flow meter; a regenerative generatorthat generates electric power by being driven by the power of the hydraulic regenerative motor; and a motor generatorthat assists drive of the engineby the electric power supplied from the regenerative generator