Patent ID: 6955358

Claim:
An oil seal for being provided on an outer circumference of a rotary shaft for sealing a first liquid and a second liquid, said oil seal comprising: a ring which is fixed on the outer circumference of the rotary shaft and which includes a flange projecting outward from the rotary shaft substantially along a radial direction of the rotary shaft; a first seal which includes at least a first portion which is bent with respect to an axial direction of the rotary shaft to abut against the flange so as to seal a side on which the first liquid is provided; a second seal which includes at least a first portion which is bent with respect to the radial direction of the rotary shaft to seal a side on which the second liquid is provided; and at least one communication hole in at least one of the first seal and the second seal, said at least one communication hole communicating between an inside and an outside of a space surrounded by the first seal, the second seal and the ring.