| 摘要 |
PURPOSE: To improve the reliability and the durability of an equipment assembled with an expansion correction bearing by allowing a ring fixed to the outer periphery of an outer wheel body to scarcely crack. CONSTITUTION: Odd number such as three or more of gates for injection molding rings 7 are circumferentially provided in the grooves 6 of the outer periphery of an outer wheel body 2. As a result, a weld does not exist at the radially opposite position so that damage such as a crack scarcely occurs at the weld. |
