| 摘要 |
PURPOSE:To perform a pivotal turn around a ground point gradually by providing an inching valve capable of being operated with a foot. CONSTITUTION:As the inching spool 61 of an inching valve G is depressed with a pedal, the pressure oil begins to escape through the notch 61b of the spool 61 to a port L through a slant face 61a and the pressure oil flowing into a clutch unit through an auxiliary speed change oil hydraulic control valve E is decreased in accordance with the amount of the pedal depression, then the half-connected condition of the clutch is created at the strength proportional to the decrease. When the pedal is further depressed, the pressure oil escapes to the port L through the notch 61b instead of through the slant face 61a, and the pressure oil of an oil pressure unit flowing from the auxiliary speed change oil hydraulic control valve E escapes to a drain port D through a notch 61c, thereby the auxiliary speed change unit is put in a neutral condition and the vehicle is stopped. |
