Parker-hannifin Corporation

Nick White

Hao Zhang

Raymond E Collett

James Howland

Jeff Cullman

Patrick Stegemann

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.

Growing community of inventors

Shaker Heights, OH, United States of America

Nick White