Hydraulic circuit for forklift
AssigneeDoosan Corporation
InventorByung Kwon LEE
Life of this patent
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Abstract
The present disclosure relates to a hydraulic circuit for a forklift, and more particularly, to a hydraulic circuit for a forklift which is capable of preventing an engine from being stopped due to surge pressure that instantaneously occurs when a lift cylinder reaches an end stroke and thus cannot be operated any further when the lift cylinder is extended. According to the hydraulic circuit for a forklift according to the exemplary embodiment of the present disclosure, which is configured as described above, the accumulator is provided on the hydraulic line through which the working fluid is provided to the lift cylinder, and as a result, the accumulator may quickly absorb surge pressure when the surge pressure is produced in the lift cylinder or the hydraulic line.
Claims6
A hydraulic circuit for a forklift, the hydraulic circuit comprising:
- an engine which produces power;
- a hydraulic pump which is operated by the power so as to suck a working fluid from an oil tank and discharge the working fluid;
- a control valve which is connected to the hydraulic pump through a first hydraulic line, and controls a flow rate and a flow direction of the working fluid discharged from the hydraulic pump;
- a lift cylinder which is connected to the control valve through a second hydraulic line, operated by the working fluid introduced through the second hydraulic line, and connected to the oil tank through a third hydraulic line so as to discharge the working fluid to the oil tank;
- a relief valve which is formed on a hydraulic line that connects the second hydraulic line and the third hydraulic line, has relief pressure set thereto, and is opened when abnormal high pressure higher than the relief pressure is formed in the second hydraulic line;
- and
- an accumulator which is connected to the first hydraulic line or the second hydraulic line, and absorbs surge pressure when the surge pressure is produced in the first hydraulic line or the second hydraulic line.
Dependencies are inferred from the claim text.