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. 27, 2018
Filed:
Jan. 04, 2013
Parker-hannifin Corporation, Cleveland, OH (US);
Jeff Cullman, Wadsworth, OH (US);
Hao Zhang, Twinsburg, OH (US);
Richard D. Kimpel, Middleburg Hts., OH (US);
Zhesheng Jiang, Solon, OH (US);
Raymond Collett, Put-In-Bay, OH (US);
Bogdan Kozul, Seven Hills, OH (US);
Parker-Hannifin Corporation, Cleveland, OH (US);
Abstract
A swing drive system () for an excavator is provided which utilizes a prime mover () mechanically connected to a first hydraulic pump/motor () and a second hydraulic pump/motor () mechanically connected to a swing mechanism (). The system includes a hydraulic circuit () connecting a hydraulic fluid reservoir (), a hydraulic accumulator (), the first hydraulic pump/motor (), and the second hydraulic pump/motor (). The system is operable in one mode where the second hydraulic pump/motor acts as a pump to retard movement of the swing mechanism and pressurized hydraulic fluid from the second hydraulic pump/motor is pumped into the hydraulic accumulator. The system is operable in another mode where the pressurized fluid from the hydraulic accumulator is used to assist the prime mover in driving hydraulic consumers (), including the swing mechanism.