| 摘要 |
PURPOSE:To enable travelling even in torubles of a change gear ratio controlling valve by supplying pressurized oil through a low speed stage change-over oil path from a manual valve changed over to a low range or backward state range to a low speed change stage port of the change gear ration controlling valve. CONSTITUTION:When a manual valve 43 is changed over to an L range or backward an R range, an oil supply port 431 is adapted to communicate through an L port 434 or a backward port 433, low speed stage change-over oil path 45 to a low speed change stage port 493 so that low speed stage changing-over oil pressure is applied to a change gear ration controlling valve 49. Thus, in the change gear ratio controlling valve 49, the primary cylinder 33 side is adapted to communicate to a drain port 495 to change over and hold a continuously variable transmission section to high change gear ration(low speed change stage). Hence, when a solenoid valve 47 is made inoperative by failures or the like and the change gear ratio controlling valve 49 is made inoperative, main and sub-ports 419, 492 communicate with each other by a spring to establish the low speed change stage and enabel emergency travelling. |
