| 摘要 |
<p>PURPOSE:To permit reconnection of clutch free from shock by constituting an electric conduction circuit for a solenoid valve so as to generate a prescribed number of times of chopping when the solenoid valve in a creep preventing apparatus is restored to a deenergized state from an excited state and gradually increasing the operating hydraulic pressure of a clutch for advance. CONSTITUTION:A creep preventing apparatus Nc installed between a clutch C1 for the first speed, namely for advance and a gear change controller Cc which are installed in the first-speed gear train of an automatic speed change gear is constituted so that a pilot-type control valve V is installed in a discharged-oil passage 18 which is branched from a supplied-oil passage 16 which communicates to the hydraulic chamber of the above-described clutch C1 and communicates to an oil tank Ot. Said control valve V is equipped with a spool valve 19 which moves upward against a return spring 23 when a solenoid valve 29 is energized for preventing creep. In this case, a prescribed number of times of chopping is generated in the solenoid valve 29 within a prescribed time, when the solenoid valve 29 is restored to a deenergized state from an energized state, and the non-conduction time during chopping is controlled so as to increase with the lapse of time.</p> |
