| 摘要 |
PURPOSE: A booster having a return spring for a vehicle is provided to install an output shaft with the return spring in a static room without a retainer by improving the return spring restoring a valve body and the output shaft. CONSTITUTION: A return spring(80) of a booster includes an elastic support portion(81) and a separation preventing end(82). The elastic support portion is composed of a coil spring. The elastic support portion is combined to a front shell(11) on one end and supported to a valve body(60) on the other end. The separation preventing end is folded on the other end of the elastic support portion to support an end(52) of an output shaft(50). Thereby, the valve body and the output shaft are supported by the elastic support portion of the return spring. An assembling condition of output is maintained by the separation preventing end. Consequently, the output shaft is installed solidly by the return spring without additional components.
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