| 摘要 |
PURPOSE:To improve the ability of making a small sharp turn by keeping steering of a subsidiary steering wheel zero when the main steering wheel is subjected to small steering, and controlling steering of the subsidiary steering wheel to be gradually increases with an increase in steering of the main steering wheel. CONSTITUTION:When the turning angle of a handle is small, the operation of main steering means 10 is small and steering of front wheels 4, 4 is small. When the handle is turned to the right or left, a steering transmitter 12 is pushed onward or retreated to operate steering control means 14. As the steering control means 14 comprises a Watts link mechanism, the moving point is located at the substantially neutral position while the steering of the front wheels 4, 4 is small, so that the rear wheels 6, 6 are not steered. When the turning angle of the handle is enlarged and the steering of the front wheels 4, 4 changes largely, the operation of the steering transmitter 12 is enlarged and the steering control means 14 is largely operated, so that the steering of the rear wheels 6, 6 is gradually increased. Thus, the ability of making a small sharp turn can be improved. |
