| 摘要 |
A bidirectional hydrodynamic shaft seal (8) includes an annular plastic disk (14) having a sealing surface (16) or lip provided with two connected spiral grooves (27, 29) extending around the disk axis (47). One of the spiral grooves spirals outwardly in a clockwise direction, and the other spiral groove spirals outwardly in a counterclockwise direction so that the spiral grooves have multiple intersection points (51). The shaft seal is designed for operation in either or both directions of shaft rotation.
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