| 摘要 |
PROBLEM TO BE SOLVED: To provide a seal ring further enhancing abrasion-resistance while maintaining sealing ability. SOLUTION: A shape of a communication groove 2 is constituted to a circularly extending shape. A taper 21 formed such that a gap between a side wall surface of an annular groove and it gradually becomes larger as it approaches to a groove bottom of the annular groove in the attached state is provided at a bottom of the communication groove 2. |
