Hydraulic drive system
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsTomomichi NOSE, Hayato KAWASAKI, Hideyasu MURAOKA, Nobuyuki KINOSHITA
Life of this patent
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Abstract
This hydraulic drive system includes: a hydraulic pump that supplies a working fluid to a hydraulic actuator; a meter-in control valve that controls a flow rate of the working fluid flowing from the hydraulic pump to the hydraulic actuator; a meter-out control valve that controls a flow rate of the working fluid being drained from the hydraulic actuator into a tank; and a regeneration valve that supplies, to the hydraulic actuator, the working fluid drained from the hydraulic actuator. The meter-out control valve is connected to the hydraulic actuator in parallel with the regeneration valve.
Claims6
A hydraulic drive system comprising:
- a hydraulic pump that supplies a working fluid to a hydraulic actuator including two ports;
- a first control valve that is a spool valve connected to one of the two ports, and controls a meter-in flow rate of the working fluid being supplied from the hydraulic pump to the one of the two ports and a meter-out flow rate of the working fluid being drained from the one of the two ports into a tank;
- a second control valve that is a spool valve connected to the other of the two ports, and controls a meter-in flow rate of the working fluid being supplied from the hydraulic pump to the other of the two ports and a meter-out flow rate of the working fluid being drained from the other of the two ports into the tank;
- and
- a regeneration valve that supplies, to the hydraulic actuator, the working fluid drained from the hydraulic actuator, wherein
- the second control valve is connected to the hydraulic actuator in parallel with the regeneration valve.
Dependencies are inferred from the claim text.