| 摘要 |
PURPOSE:To regulate the wear of rollers on a guide member and improve its durability by connecting the guide member to a steering frame with the center of the arranging pitch of the front and rear rollers engaging with a guide rail placed directly below a steering axis. CONSTITUTION:A guide member 11 is connected with a steering frame 14 with the center of the arranging pitch of front and rear rollers 11a and 11a placed directly below a steering axis. This turns the steering frame 14, if the center of the guide member 11 deviates from the steering axis in the leading side, for example, so as to make it face to the tangential direction coaxially with the guide member, and also smoothly steers the drive wheel 7 brought into contact with the road surface 1a coaxially with the steering frame 14 so as to face to the tangential direction without cross deviation. Thus, the steering reaction actuated between the guide member 11 and a guide rail 10 is reduced, and the wear of the roller 11a and guide rail 10 is regulated resulting in the improvement of durability. |
