| 摘要 |
PROBLEM TO BE SOLVED: To obtain a structure which can secure the movement of a seal lip 22a arranged at a seal ring 17a by suppressing the intrusion of foreign matters into a seal internal space 26a between a slinger 16 and the seal ring 17a which constitute a combination seal ring 12a.SOLUTION: A labyrinth seal 27a is arranged between an external peripheral face of a rotation-side circular ring part 19 constituting a slinger 16, and an internal peripheral face of a stationary-side cylinder part 23 of a core grid 20 constituting a seal ring 17a. A thick part 29 is formed at a part of an elastic member 21a constituting the seal ring 17a over the whole periphery, and an auxiliary seal lip 32 which is lower than seal lips 22a to 22c in stiffness is arranged at the thick part 29 over the whole periphery. The auxiliary seal lip 32 prevents that foreign matters intrude into the seal lip 22a, and the movement of the seal lip 22a is hindered.SELECTED DRAWING: Figure 1 |
