| 摘要 |
<p>PURPOSE:To lessen shocks at the time of starting etc. by furnishing an accumulator equipped with No.1 spring, which gives resistance to a piston moving in its whole stroke, and No.2 spring which gives resistance only in the later half of the piston stroke. CONSTITUTION:On a working oil supply path 20 a throttle part is installed in parallel connection with No.1 opening/closing valve 21 and No.2 opening/ closing valve 27, wherein the No.1 valve shuts when the secondary side oil pressure reaches No.1 set value while the No.2 valve opens when the same pressure attains No.2 set value. When the pressure of an oil pressure clutch 3 reaches the mentioned No.1 set value to shut the No.1 opening/closing valve 21 which is open normally, the pressure boosts gradually, and a resistance given only by No.1 spring 31 acts on the movement of a piston 35 in an accumulator 23. Because this resistance is weak, the pressure rise is gradual, but when the piston 35 attains the specified position, resistances of No.1 spring 31 and No.2 spring 33 act simultaneously to quicken the rise of the pressure. Thus shock is lessened because of decreasing difference in the boosting degree between this quickened pressure rise and the pressure rise after the No.2 valve 27 opened.</p> |
