| 摘要 |
PURPOSE:To prevent interlocking by installing a valve which operates other tightening pressure for interlocking as signal pressure and prohibits the output of the tightening pressure to a tightening element when at least one signal pressure is generated, between a solenoid pressure adjusting valve and the tightening element. CONSTITUTION:When a trouble is generated in the electric system of a solenoid pressure adjusting valve and a solenoid hydraulic pressure is continuously generated, and in spite of this state, if other tightening element pressure is generated on the basis of a speed change instruction, the solenoid hydraulic pressure which is generated because of the trouble of the interlocking preventing valves 31-34 installed between the solenoid pressure adjusting valves 21-24 and tightening elements 11-15 is operated as signal pressure. Accordingly, output of the tightening pressure to a tightening element which is tightened after speed change is prohibited. Accordingly, interlock is surely prevented with high reliability when a trouble is generated in the electric system of a solenoid pressure adjusting valve. |
