| 摘要 |
<p>PURPOSE:To prevent engine start due to inertia by providing an electromagnetic throttling valve to regulate return oil from a hydraulic actuator at cutoff of an electric source, in an oil passage connecting a hydraulic actuator for clutch operation to an electromagnetic control valve. CONSTITUTION:Pressure oil from a hydraulic pump 13 is introduced to a hydraulic cylinder C5 for operating a main clutch through an electromagnetic control valve V5, and an electromagnetic throttling valve 15 is provided on an oil passage connecting the hydraulic cylinder C5 to the electromagnetic control valve V5. This electromagnetic throttling valve 15 let the total quantity of pressure oil pass through usually, but at OFF of the main key of a tractor, actuates so as to regulate return oil from the hydraulic cylinder C5. Consequently, at engine stop, clutch on due to drop of oil pressure is previously prevented, and start of the vehicle due to inertia of the engine is prevented. Thus the vehicle can be kept in stable condition.</p> |
