| 摘要 |
PURPOSE:To provide the title steering gear so designed that a spring for neutral restoration is stretchedly suspended between a tie rod and a front wheel shaft, and steering arms to come into contact with ridge sides are respectively projected in an integral manner from the corresponding knuckle supporting shafts, thereby making the title machine run properly along the ridge. CONSTITUTION:A pair of left and right knuckle supporting shafts 23 as automatic steering gear are, via a tie rod 25, are pivotally connected to a pair of front wheels 11 so as to be allowed to make oscillating motion mutually in an integrated manner. A spring 26 for neutral restoration is stretchedly suspended between the tie rod 25 and a front wheel shaft 21 and elastically energized so that both the front wheels 11 are kept so as to enable direct advance at all times. And steering arms 27 to be in contact with the sidewalls of a ridge G are projected in an integrated manner from the respective knuckle supporting shafts 23. Thereby, when the steering arms 27 come into contact with the sides of the ridge G, the contact can be detected by the respective contact plate pieces 29 attached to said arms, and a pair of the front wheels 11 make an oscillating motion followably so as to spontaneously adapt to the arms toward their bending direction, thus properly carrying out seedling planting in the ridge G. |
