SEALING DEVICE

摘要

The purpose of the present invention is to provide a sealing device which has forward and reverse screw threads exhibiting a fluid-pumping action provided on a sliding portion of a seal lip, such that the pumping action is less susceptible to deterioration even with increasing wear on the screw threads and such that leakage of droplets from the screw threads is minimized. To achieve this, the forward and reverse screw threads which exhibit a pumping action on sealing fluid are arranged in a circle on the air-side lateral surface of the sliding portion of the seal lip. The forward and reverse screw threads each have a shape gradually increasing in thread height from the leading end of the lip to the air side. The forward screw threads and/or reverse screw threads are provided with seal protrusions for preventing leakage of droplets.

主权项

1. A sealing device wherein forward direction screws and reverse direction screws achieving a pumping action in relation to a sealed fluid are circumferentially provided in line in an atmosphere side lateral face of a seal lip sliding portion, each of said forward direction screws and the reverse direction screws has such a shape that a screw height is enlarged little by little from a lip leading end toward an atmosphere side, and
wherein a seal projection for preventing leak by spray is provided in any one or both of said forward direction screws and the reverse direction screws.