| 摘要 |
A working vehicle in which a problem that might cause an engine stop when a variation in load on the working section and thereby load on the engine is significant because the vehicle speed of a traveling machine body is reduced only by a predetermined ratio or a predetermined amount by an automatic vehicle speed control is eliminated. The straight advance rotary shaft (105) of a straight advance HST system speed change mechanism (35) is associated with an electric motor (170) through a link mechanism (171). A relay arm (176) and a sector gear (174) constituting the link mechanism (171) are arranged to be able to rotate around an axle (175) within a range from the initial position to the maximum forced slowdown position through rotary driving of the electric motor (170). When the relay arm (176) and the sector gear (174) are rotated up to the maximum forced slowdown position, a straight advance detent rod (135) rotates back to the neutral position and shifts the straight advance rotary shaft (105) (rotary swash plate of a first hydraulic pump) to the neutral position, thus decelerating the traveling machine body up to a substantially stopping state. |
