Patent ID: 8141882

Claim:
A wheel seal comprising: an internal sleeve oil seal; an outer annular member; an intermediate annular member; an anti-friction ring; a first barrier; a second barrier; wherein: an annular concave inwards is formed at one side of the internal sleeve oil seal; an external ring side and an internal ring side thereby formed; a protective layer is located close to the circumference of the internal sleeve oil seal; the outer annular member has an outer annular ring portion; one side of the outer annular ring portion is connected to a junction side, and the junction side is connected to a side of an inner annular ring portion; the inner annular ring portion is located between the external ring side and the internal ring side of the internal sleeve oil seal; a gap is located between the circumference of the inner annular ring portion and the external ring side; another side of the inner annular ring portion opposite to the outer annular ring portion is connected to a prolonged side; the outer annular side of the outer annular ring portion is located close to a protective layer; the intermediate annular member is located between the internal ring side of the internal sleeve oil seal and the outer annular member; one side of the intermediate annular member, towards its central axis, forms an extended side; a free end of the extended side is connected to the internal ring side of the internal ring oil seal; the anti-friction ring is located between the external ring side of the internal oil seal and the junction side of the inner annular ring portion; the first barrier is located between the internal sleeve oil seal and the outer annular member; one end of the first barrier is connected to the prolonged side of the inner annular ring portion of the outer annular member, and another end of the first barrier is bound with an elastic part to tightly fit against the internal ring side of the internal sleeve oil seal; and the second barrier is provided between the internal sleeve oil seal and the outer annular member, the second barrier comprises a convex portion and a concave portion that are respectively connected to the inner wall of the external ring side of the internal sleeve oil seal and the outer annular side of the inner annular ring portion of the outer annular member, the convex portion comprises a lip opposite to and projecting into the concave portion, the concave portion comprises a lip radially inside of the lip of the convex portion which contacts the prolonged side of the outer annular ring, and the concave portion is kept a distance away from the convex portion so that a labyrinth zone is formed there between.