| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealing device excellent in reliability for keeping the quantity of pumping due to a screw pumping action of a screw part even at the time of abrasion. SOLUTION: A screw part 5 is provided for the sliding surface of a seal lip 2, which is equipped with plural screw ridges 5a, 5b and 5c different in height so as to be disposed out of a parted position from the tip end of the lip of the seal lip 2 toward the lip root direction as the height of each ridge becomes higher. |
