| 摘要 |
PURPOSE: A solenoid valve of automatic transmission is provided to precisely control the hydraulic component and improve the reaction speed by using the step groove. CONSTITUTION: The holder(105) has the first feedback hole and the second feedback hole. The feedback channel is formed from the first feedback hole to the second feedback hole along the outer side surface. The spool(100) is installed inside the holder. The driving part moves the pool. The feedback channel comprises the first feedback hole(135) and the feedback groove formed according to the second feedback hole in holder. The feedback channel comprises step groove more deeply formed in the site including the second feedback hole(140) than the feedback groove.
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