| 摘要 |
PURPOSE:To obtain a turning type working vehicle having an exact and smooth change gear operation system in which a servo motor for the switching operation of operating valves for a change gear provided on running device side is connected with the operating tool of the operating valves by an electric control mechanism passing through a rotary joint. CONSTITUTION:A wheeled vehicle having a running device 1 is provided with a turning base 2 freely turning around a vertical axis, and the turning base 2 is also provided with an operating portion 3. On the front of the operating portion 3, an excavator 4 freely turning around the vertical shaft is provided, and by turning base 2 and the excavator 4 around respective vertical axes, excavation work including side trench excavation work is performed and also even earth- moving work is conducted while travelling. In such a working vehicle, when driving the device 1, a pressure fluid from the turning base 2 side is supplied through the rotary joint 6 to a motor M provided on the running vehicle side, and the rotary driving force of the motor M is transmitted through a fluid pressure operation type change gear 7 to the device 1 in such a way as to enable 4-stage speed change to be permitted. |
