| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling bearing unit with a combination seal ring that has a structure capable of effectively preventing a foreign matter from entering a seal inner space 26a of a combination seal ring 12b and capable of maintaining excellent seal performance for a long term.SOLUTION: A bent labyrinth seal 27b and an auxiliary seal lip 28 are arranged in series with an intrusion passage of a foreign matter. Consequently, the foreign matter is prevented from entering inner seal space 26a positioned deeper than the auxiliary seal lip 28. Since the intensity of a foreign matter reaching the auxiliary seal lip 28 weakens, the auxiliary seal lip 28 does not need to have high rigidity such that friction resistance becomes large. |
