| 摘要 |
PROBLEM TO BE SOLVED: To provide a complete sealing effect even if an end plate is eliminated. SOLUTION: The core metal 8 of an oil seal is constituted by folding a metallic plate 10. The metallic plate is provided with a plurality of folded parts 12... produced by forming notched parts 11 at equal intervals at its outer periphery, and a recessed groove 13 formed along the folded part. By folding the folded part 12 along the recessed groove 13, a core metal 8 is obtained whose outer periphery is a thick wall part. |
