| 摘要 |
The wheel is formed with a hub, which extends axially from one side. The bearing (5) is formed with a central hole, with a diameter, greater than that of the shaft (4), so that an annular free space (14) is created between the shaft and the bearing. The hub extension (6) of the wheel has a cylindrical interior wall surface (7), of approximately the same cross section as the shaft and an external wall surface (8) which is roughly conical. The hub extension engages, without play, around the shaft and is inserted into the annular free space, upto the point, where the external wall surface of the extension, comes to bear against the bearing. |
