Shovel
AssigneeSumitomo(S.H.I.) Construction Machinery Co., Ltd.
InventorYouji Misaki
Life of this patent
Estimating the term…
Abstract
A shovel includes a lower traveling body, an upper turning body turnably mounted on the lower traveling body, a hydraulic pump mounted on the upper turning body, a hydraulic actuator configured to be driven with hydraulic oil discharged by the hydraulic pump, a bleed valve configured to control the flow rate of a portion of the hydraulic oil discharged by the hydraulic pump, the portion flowing to a hydraulic oil tank without going through the hydraulic actuator, and a control device configured to control the opening area of the bleed valve in accordance with the magnitude of pulsation in the pressure of hydraulic oil supplied from the hydraulic pump to the hydraulic actuator.
Claims22
A shovel comprising:
- a lower traveling body;
- an upper turning body turnably mounted on the lower traveling body;
- a hydraulic pump mounted on the upper turning body;
- a hydraulic actuator configured to be driven with hydraulic oil discharged by the hydraulic pump;
- a bleed valve configured to control a flow rate of a portion of the hydraulic oil discharged by the hydraulic pump, the portion flowing to a hydraulic oil tank without going through the hydraulic actuator;
- an information obtaining device configured to obtain information on pulsation with respect to the hydraulic actuator;
- and
- a control device configured to calculate a magnitude of the pulsation based on the information obtained by the information obtaining device and control an opening area of the bleed valve in accordance with the calculated magnitude of the pulsation.
A shovel comprising:
- a lower traveling body;
- an upper turning body turnably mounted on the lower traveling body;
- a hydraulic pump mounted on the upper turning body;
- a hydraulic actuator configured to be driven with hydraulic oil discharged by the hydraulic pump;
- a throttle configured to control a flow rate of a portion of the hydraulic oil discharged by the hydraulic pump, the portion flowing to a hydraulic oil tank without going through the hydraulic actuator;
- an information obtaining device configured to obtain information on pulsation with respect to the hydraulic actuator;
- and
- a control device configured to calculate a magnitude of the pulsation based on the information obtained by the information obtaining device and control an opening area of the throttle in accordance with the calculated magnitude of the pulsation.
Dependencies are inferred from the claim text.