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. 14, 2017
Filed:
Dec. 20, 2013
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Shiho Izumi, Hitachinaka, JP;
Kouji Ishikawa, Kasumigaura, JP;
Shinya Imura, Toride, JP;
Shinji Nishikawa, Kasumigaura, JP;
Tomoaki Kaneta, Kasumigaura, JP;
Hiroaki Amano, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A construction machine includes: a swing structure (); hydraulic and electric motors () mechanically coupled to each other; a hydraulic pump () that supplies hydraulic fluid to the hydraulic motor; swing control lever () that instructs the swing structure to make a swing motion; and a control device () that controls at least either a delivery flow rate of the hydraulic pump or an output torque of the electric motor in such a manner that meter-out and meter-in pressures of the hydraulic motor that is run together with the electric motor approach each other when the demanded torque necessary for the swing motion of the swing structure instructed by the swing control lever can be produced by the electric motor alone.