| 摘要 |
PURPOSE: A valve for traction control is provided to simultaneously have functions of a bypass passage and a relief valve for preventing excessive outflow of hydraulic pressure from a high-pressure accumulator, to simplify the assembling process of parts, and to reduce the manufacturing cost. CONSTITUTION: An electronic valve of a brake system for a vehicle comprises a coil(111) forming an electromagnetic field by an electric signal applied; an armature(110) moving up and down by the electromagnetic field; a magnet core fixed to a valve block; a sleeve(100) fixed to the magnet core; a valve seat(300) having an orifice controlling flow; a plunger member(200) vertically slidably inserted in a hollow part formed to the magnet core, to open and shut off a wheel cylinder-side passage(310) of the valve seat; and a return spring(400) inserted between the plunger member and the valve seat. The plunger member comprises a plunger body(210) the upper part of which comes in contact with the armature; a support member(220) elastically supported by the return spring on the return spring while supporting the plunger body at the lower part; an opening and shutting member(240) directly opening and shutting the passage of the valve seat; and a relief spring(230) inserted between the plunger body and the opening and shutting member and compressed just when the wheel cylinder-side passage of the valve seat is opened by excessive hydraulic pressure.
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