US Patent No. 10,655,297

HYDRAULIC SYSTEM AND A METHOD FOR MOVING AN IMPLEMENT OF A WORKING MACHINE


Patent No. 10,655,297
Issue Date May 19, 2020
Title Hydraulic System And A Method For Moving An Implement Of A Working Machine
Inventorship Johan Lillemets, Eskilstuna (SE)
Assignee Volvo Construction Equipment AB, Eskilstuna (SE)

Claim of US Patent No. 10,655,297

1. A hydraulic system for moving an implement of a working machine, the hydraulic system comprising:a hydraulic cylinder with a cylinder and a piston which is adapted to move in the cylinder to thereby move the implement relative to a body structure of the working machine,
an actuator pump arranged to provide hydraulic fluid to the hydraulic cylinder the hydraulic cylinder having a first port and a second port adapted to be in fluid communication with the actuator pump, the hydraulic cylinder and the actuator pump being arranged so that the hydraulic cylinder is directly controlled by the actuator pump so that the rate of movement of the piston of the hydraulic cylinder is purely pump controlled,
a hydraulic accumulator for suspension of the implement,
an electronically controlled suspension control valve arranged in fluid communication between the first port and the hydraulic accumulator, wherein the hydraulic accumulator is arranged to be selectively connectable to the first port,
a further pump in addition to the actuator pump, the hydraulic accumulator being arranged to be pressurised by the further pump, and
a control unit arranged to control the electronically suspension control valve to disconnect the hydraulic accumulator from the first port.