| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an excellent gap precision of a fitting opening part and to improve productivity. <P>SOLUTION: In a method for manufacturing using a mold for injection molding of a resin-made seal ring having a fitting opening with a composite step shape and a rectangular crosssection, the resin-made seal ring in which the outer peripheral face 4a of the outer diameter face side step part 4 constituting the composite step shape has an inward gradient diameter toward a seal ring side face 1d, and a projection on the outer diameter face side of the other fitting opening to be fitted to this outer diameter face side step part 4 has approximately the same inward gradient, can be molded. <P>COPYRIGHT: (C)2007,JPO&INPIT |
