SEAL DEVICE

摘要

A seal device has a external seal member (20) formed of elastomer in an annular shape, a reinforcement ring (10) that, when placed in a housing hole (B) so as to surround the outer periphery of a rotating shaft (C), presses a fitting section (21) of the external seal member (20) to the inner peripheral surface of the housing hole (B), a retainer (40) installed inside the reinforcement ring (10), and an auxiliary seal member (30) having one end held inside the reinforcement ring (10), between the retainer (40) and the reinforcement ring (10), and the other end pressed to the outer peripheral surface of the rotating shaft (C). An elastic tongue piece (42) and an engagement section (13) are arranged between the retainer (40) and the reinforcement ring (10). In installation of the retainer (40) inside the reinforcement ring (10), the elastic tongue piece (42) and the engagement section (13) elastically deform to allow the installation, and when the auxiliary seal member (30) is held between the retainer (40) and the reinforcement ring (10), the elastic tongue piece (42) and the engagement section (13) elastically restore their shapes to prevent falling out of the retainer (40).