| 摘要 |
<p>PURPOSE:To reduce the cost of the device in the caption by providing a directional control valve, which can be switched when the hydraulic pressure of a second hydraulic clutch device exceeds the fixed value, between a hydraulic pump and first and second hydraulic clutch devices. CONSTITUTION:A directional control valve 22, which is provided between a hydraulic pump 21 and first and second hydraulic clutch devices 7, 12, serves as a 6 port/2 position switching valve, and is switchable from the first position, where the first hydraulic clutch device 7 and the second hydraulic clutch device 12 are connected in series with each other in this order, to the second position, where they are connected in series with each other in reverse order. The directional control valve 22 is switched from the first position to the second position when the hydraulic pressure of the second hydraulic clutch device 12 exceeds the fixed value. Therefore, it is possible to secure certain operation of two hydraulic clutches without using a priority valve so as to reduce the cost of this device.</p> |
