| 摘要 |
<p>PURPOSE:To prevent the generation of unnecessary hydraulic power by bypassing a discharged oil from a second hydraulic pump into a low-pressure pipe line under a condition that a clutch is disconnected. CONSTITUTION:When a large quantity of pressure oil is required by a hydraulic actuator 2 in order to keep a clutch 1 engaged, discharged oil from both hydraulic pumps 5 and 9 can be fed to a discharge pipe line 5a. On the contrary, when the clutch 1 is disconnected without requiring a large quantity of pressure oil to be fed in the discharge pipe line 5a, only the hydraulic pump 5 is operated as a hydraulic pump while the hydraulic pump 9 is left near unloaded condition. Accordingly, unnecessary hydraulic power is not generated under a condition that the clutch 1 is disconnected, reducing a power loss.</p> |
