| 摘要 |
A lip type seal device for a rotary shaft seals about the rotary shaft between a high pressure inner zone and a low pressure outer zone. The lip type seal device includes a first seal, a second seal. The first seal is arranged adjacent to high pressure side, and the second seal is arranged at low pressure side of the first seal. The first seal and the second seal contact an outer peripheral surface of the rotary shaft, and seal about the rotary shaft. The lip front end of the first seal is supported by a bending portion of a support ring. The lip front end of the first seal is also supported by the back-up portion arranged in a space between the lip front end of the first seal and the lip front end of the second seal. Therefore, the bending portion and the back-up portion prevents the lip front end of the first seal from bending or depressed by the high pressure inner zone, while the rotation of the rotary shaft is stopped. Accordingly, lubricant oil stored in the space is prevented from being extruded to the low pressure side.
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