| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealing structure of a shaft seal part capable of surely and stably keeping sealing performance over a long period of time, and easily recovering a designated sealing performance even if leakage occurs. SOLUTION: In the inner peripheral part and outer peripheral part of an annular seal case 3, grease filling annular grooves 8, 9 are formed between the elastic seal rings 5A, 5B adjacent to each other in the axial direction on the outer peripheral side and between elastic seal rings 4A, 4B on the inner peripheral side, and the inner and outer grease filling annular grooves 8, 9 are communicated with each other. A cylindrical housing 2 is provided with a grease filling port 11 with a check valve, which is communicated to the outside grease filling annular groove 8.
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