| 摘要 |
Disclosed is a method of making a wheel assembly such as a pulley with a bearing. A wheel is molded from a material that shrinks when its temperature falls from a temperature above 100 DEG F. to room temperature. The wheel has a circular opening at its center suitable for holding a circular bearing. The diameter of the circular opening when the wheel is at a temperature above 100 DEG F. is greater than the diameter of the circular bearing and is less than the diameter of the circular bearing when the wheel is at room temperature. The bearing is positioned inside the opening when the wheel is at a temperature above 100 DEG F. The wheel is cooled to room temperature and shrinks around the bearing, thereby fixing the bearing to the wheel. Also disclosed is a wheel assembly made by this method.
|
