| 摘要 |
A mechanical seal 4 includes a rotary sealing ring 8 which is fixed to a rotary shaft body 2 and a stationary sealing ring 9 which is movably held to a tubular case body 1 in an axial direction thereof, and seals a space between inner and outer peripheral areas 5 and 18 of a relative rotation portion by means of the relative rotation of opposite end faces 21 and 27 of both sealing rings 8 and 9. A drive pin 24 a which is engaged with a recessed portion 23 formed in an outer periphery of the stationary sealing ring 9 is fixedly supported to the case body 1 at both sides of a place engaging with the recessed portion 23 so as to prevent the stationary sealing ring 9 from rotating relatively to the case body 1. The drive pin 24 a is made of a metal or plastic material according to the conditions of use. The rotary prevention function of the stationary sealing ring 9 is stably achieved by the drive pin 24 a, and the plastic material that enables to prevent a contamination may be used as the constituting material of the drive pin 24 a.
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