Patent ID: 7946592

Claim:
A bearing seal that seals an outer periphery of a shaft, said bearing seal comprising: a ring-shaped outer seal portion; a ring-shaped inner seal portion provided inside the outer seal portion; a connecting portion which connects the inner seal portion and the outer seal portion; and a ring-shaped rigid portion provided at the connecting portion, wherein: the outer seal portion, the inner seal portion, and the connecting portion are integrally formed of a common material consisting of an elastic material; the inner seal portion has a ring-shaped seal surface gradually approaching a ring center axis of the inner seal portion while extending from a side of a ring-shaped base end connected to the connecting portion toward a distal end side; the inner seal portion has the ring-shaped seal surface on an inner peripheral surface thereof and has a tapered cylindrical shape extending from the base end side to the distal end side such that a thickness of the inner seal portion gradually decreases from the base end side toward the distal end side where the ring-shaped seal surface on the inner peripheral surface gradually approaches the ring center axis of the inner seal portion while extending from the side of the ring-shaped base end connected to the connecting portion toward the distal end side, and the inner seal portion extends toward a side away from a lubricant oil storage space defined at least in part by the outer periphery of the shaft; the inner seal portion includes only one inner seal portion, and the ring-shaped base end of the inner seal portion is spaced apart from the shaft such that the inner seal portion is in contact with the shaft at only a single location at the distal end side; and cross sections of the outer seal portion, the inner seal portion and the ring-shaped rigid portion are constructed so that a rigidity of the inner seal portion is less than a rigidity of the ring-shaped rigid portion and is greater than a rigidity of the outer seal portion.