| 摘要 |
A spiral gasket (1) which can suppress the deformation of an inner ring (13) and an outer ring (14) thereof is provided. The spiral gasket includes: a gasket body (12) having a body portion (12a), an inner peripheral empty winding portion (12b) which is formed on an inner periphery of the body portion, and an outer peripheral empty winding portion (12c) which is formed on an outer periphery of the body portion; an inner ring having an outer peripheral surface on which an inner ring pawl portion (13c) engageable with an inner peripheral surface of the inner peripheral empty winding portion is formed; and an outer ring (14) having an inner peripheral surface on which an outer ring pawl portion (14c) engageable with an outer peripheral surface of the outer peripheral empty winding portion (12c) is formed. The number of turns of the inner peripheral empty winding portion (12b) and the number of turns of the outer peripheral empty winding portion (12c) are set to 5 to 10. A predetermined first gap (S1) is formed between the inner peripheral surface of the inner peripheral empty winding portion and a portion of the outer peripheral surface of the inner ring except for the inner ring pawl portion. A predetermined second gap (S2) is formed between the outer peripheral surface of the outer peripheral empty winding portion and a portion of the inner peripheral surface of the outer ring except for the outer ring pawl portion. |
