| 摘要 |
PURPOSE:To facilitate the adjustment of a tread by providing the tube of a power cylinder on an axle, rotatably in the three-dimensional directions on a center shaft, and connecting the piston rod of said power cylinder to a steering arm via an expandable/contractable tie rod. CONSTITUTION:In the power steering device of an agricultural tractor having a small power cylinder, steering wheels 2 are rotatably supported on both ends of an axle 5 which is swingably supported by an axle frame 6 via a center shaft 7, and the steering wheels 2 are steered by the operation of a power cylinder 12 provided in parallel to the axle 5 via steering arms 11. In this case, the cylinder tube 13 of the power cylinder 12 is installed to the axle 5 via a connecting member 20 having a ball joint 22 provided on a vertical plane passing through the axis of the center shaft 7 and a support shaft 26 which is parallel to the axis of the axle 5. And, a piston rod 15 fitted in the cylinder tube 13 is formed into a hollow shaft structure and tie rod shafts 28 are installed expandably/contractably adjustably and fixably in its shaft bore 15A.
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