| 摘要 |
The present invention relates to a solenoid valve that minimizes the operational resistance of a rod generated inside a solenoid and effectively controls oil pressure discharged via the valve by accurately controlling the falling position of the rod. The solenoid includes a hollow bobbin which a coil is wound on the outer circumference; a core which is joined to the upper part of the bobbin and which includes a first chamber inside; a yoke which is joined to the lower part of the bobbin and which includes a second chamber inside; a plunger which reciprocates inside the bobbin; and a rod which is penetrated through the plunger and joined and which operates the valve. A flow passage is formed inside the rod. A first passage connecting the flow passage and the first chamber is formed on the upper part of the rod, and a second passage connecting the flow passage and the second chamber is formed on the lower part of the rod. Cooling and lubricating fluids are charged inside the first and second chambers, and the first and second chambers are connected by the passage formed inside the rod. The first passage connecting the flow passage and the first chamber and the second passage connecting the flow passage and the second chamber are formed to penetrate through the lateral surface of the rod so that the second passage is not closed even though the rod moves and contacts a control screw. |
