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:
Jul. 17, 2018
Filed:
Jan. 30, 2014
Parker-hannifin Corporation, Cleveland, OH (US);
Hao Zhang, Twinsburg, OH (US);
Jeff Cullman, Wadsworth, OH (US);
Raymond Collett, Put in Bay, OH (US);
James Howland, Mayfield Heights, OH (US);
Nick White, Shaker Heights, OH (US);
Patrick Stegemann, Arlington Heights, IL (US);
Parker-Hannifin Corporation, Cleveland, OH (US);
Abstract
A hybrid swing drive system () of a hydraulic construction machine includes a variable displacement hydraulic swing pump () operable by a prime mover (); a hydraulic swing motor () for performing a swing function of the machine; an accumulator (); a controller (); a swing control valve assembly () disposed in a first hydraulic path extending from the swing pump to the swing motor, the swing control valve assembly having a first position fluidly connecting the swing pump to a first side of the swing motor and a second position fluidly connecting the swing pump to a second side of the swing motor; and an accumulator control valve () having an open position fluidly connecting the accumulator to the first hydraulic path at an accumulator control valve connection point and a closed position fluidly isolating the accumulator from the first hydraulic path.