| 摘要 |
<p>PURPOSE:To minimize inertia force of a driving shaft system and to enable smooth speed change by providing a brake mechanism on a differential driving shaft and operating the brake mechanism when the forward and backward clutch switching valve mechanism is held in a neutral position. CONSTITUTION:Hydraulic clutch mechanisms 12, 13 for forward and backward movements of a running system speed change mechanism 7 interlocking with an engine are freely switched by switching a control valve 14. A brake mechanism 21 operated by oil pressure is provided on a differential driving shaft 8, so that the braking operation can be performed by rotation of the differential driving shaft 8. When a control valve 19 for the hydraulic clutch mechanisms 12, 13 for forward and backward movements is retained in the neutral position, the brake mechanism 21 can be operated by a pipeline 18. At the time of speed change operation, when the switching operation is in the neutral state, braking force is applied to the driving shaft system to minimize the inertia force and enable smooth speed change.</p> |
