Hydraulic circuit for construction machine
AssigneeSumitomo(S.H.I.) Construction Machinery Co., Ltd.
InventorHirofumi HASHIMOTO
Life of this patent
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Abstract
A direction control valve group for a construction machine that controls an amount of pressure oil supplied to a hydraulic actuator from a hydraulic pump that discharges the pressure oil is provided. The direction control valve includes a cylinder port that supplies the pressure oil to the hydraulic actuator, a bridge passage that is switchably connected and disconnected to the cylinder port according to a change in position of a first spool, and an internal passage that supplies the pressure oil discharged from the hydraulic pump to the bridge passage. The first spool is provided in the internal passage.
Claims16
A direction control valve group for a construction machine that controls an amount of pressure oil supplied to a hydraulic actuator from a hydraulic pump that discharges the pressure oil, the direction control valve group comprising:
- a cylinder port that supplies the pressure oil to the hydraulic actuator;
- a bridge passage that is switchably connected and disconnected to the cylinder port according to a change in position of a first spool;
- and
- an internal passage that supplies the pressure oil discharged from the hydraulic pump to the bridge passage;
- wherein the first spool is provided in the internal passage.
A hydraulic shovel comprising:
- a direction control valve group for a construction machine that controls an amount of pressure oil supplied to a hydraulic actuator from a hydraulic pump that discharges the pressure oil;
- wherein the direction control valve includes
- a cylinder port that supplies the pressure oil to the hydraulic actuator;
- a bridge passage that is switchably connected and disconnected to the cylinder port according to a change in position of a first spool;
- and
- an internal passage that supplies the pressure oil discharged from the hydraulic pump to the bridge passage;
- wherein the first spool is provided in the internal passage.
Dependencies are inferred from the claim text.