| 摘要 |
It is intended to irrespective of any special fluid sealed, prevent wearing of a seal surface of shaft sealing device. Further, it is intended to lower machining accuracy of slide surface of rotary shaft and to prevent any damages of seal surface by contact with other parts. There is provided a shaft sealing device comprising seal assembly (2) equipped with fitting part (4) having a fitting surface hermetically fittable with a hole defining surface of housing and equipped with first seal lip (3) of rubbery elastomer extending inward from the fitting part (4) and having seal surface (3A1) for sealing of sealed fluid (L1) inside an internal boundary thereof; seal sleeve (10) of metal or resin material equipped with slide seal surface (10D) capable of sliding in close contact with the seal surface (3A1) of the seal lip (3), equipped with rotor (10A) surrounding in concave form seal surface region (L1) at a longitudinal end of the slide seal surface (10D), and equipped with close-contact fitting surface (15) hermetically fitting to rotary shaft (50); and discharge means (20) capable of pushing back the sealed fluid (L1) to the rotor (10A) in a direction departing from the seal surface region (L1). |
