| 摘要 |
PURPOSE: A door checker using a hydraulic cylinder is provided to keep the opening angle of a door by keeping the door in the arbitrary location in which a user wants. CONSTITUTION: A door checker(100) using a hydraulic cylinder comprises a cylinder(150), a piston rod(112), a piston head(110), a flow route(130), a check valve unit(120). The fluid is charged in the cylinder coupled with a door. One side of the piston rod is coupled to a body of a vehicle to be rotated, the other side of the piston rod is inserted in the cylinder. The piston rod is formed to be able to move along the longitudinal direction of the cylinder while the door is opened and closed. The piston head is formed in the one side of the piston rod. The piston head is divided into a first cylinder chamber(150a) and a second cylinder chamber. The flow route is connected with the first cylinder chamber and the second cylinder chamber. The flow route makes the flow of the fluid between the first cylinder chamber and the second cylinder chamber while the piston head moves in the head cylinder. The check valve unit is operated by the fluid pressure according to the flow of the fluid.
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