| 摘要 |
PURPOSE: A hydraulic door checker for automobile is provided to keep the door opened wherever (uphill and/or downhill road) it drives by selectively opening/closing flow route of the door checker to solve a problem of three-stages opening system for the automobile. CONSTITUTION: The checker comprises an oil cylinder(110) parallel to a door(2); a piston rod(120) connected to a body by a pin(P) at one end and inserted into the cylinder(110) at the other end to move along length of the cylinder(110) when the door opens/closes; a piston(130) perpendicular to end of the rod(120) to divide inner space of the cylinder(110) into two hydraulic chambers(111,112) and to form a route for oil flow; and a valve(140) perpendicular to the piston(130) to flexibly move up/downward by the hydraulic pressure and having an oil inlet/outlet hole to selectively communicate with the oil route.
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