| 摘要 |
PURPOSE:To enable tread adjustment work to be carried out easily and in a short time by fitting inside and outside wheel disks on a wheel shaft and a mobile shaft and arranging the mobile shaft so as to freely adjust left and right positions by means of a mobile mechanism. CONSTITUTION:A cylinder 15 is formed on a wheel shaft 5 supported by a shaft in a cylindrical body 4 fitted on a gear case, while a mobile shaft 16, with its piston 16a fitted in the cylinder 15, is supported by means of a bearing cylinder 17 and an outside disk 18 is fixed on the outside part of the mobile shaft 16 by means of a bolt 19. Further, an inside disk 20 is fixed on a fitting seat 5a of the wheel shaft 5 by means of a bolt 21, while a bracket 22, fitted to a pin- like guide 26 fixed to the inner periphery of a wheel rim 25, is fixed on the outer periphery of the inside disk 20 by means of a bolt 23. On the other hand, the outer periphery of the outside disk 18 is fixed to the guide 26 by means of a bolt 27. Then adjustment of a tread is performed without step according to the width of a ridge and the like through operation of a mobile mechanism 28 including the cylinder 15 and the piston 16a. |
