Patent ID: 7793939

Claim:
A sealing structure for a wheel supporting device that includes an axle mounted on a vehicle body and an annular housing which is rotatably supported by the axle through a rolling bearing and to which a wheel is attached, the sealing structure comprising: a seal cover disposed in an annular clearance between an outer peripheral surface of the axle and an inner peripheral surface of the housing outside the rolling bearing in an axial direction, the seal cover including: a cylindrical part which is fixed to the outer peripheral surface of the axle; an annular flange part which is formed so as to extend outward in a radial direction from an end part of the cylindrical part in the axial direction and opposed to an end surface of the housing in the axial direction; and a cylindrical deflector part which is formed so as to extend in the axial direction from an outer peripheral edge of the flange part and opposed to an outer peripheral surface of the housing; and a seal rubber comprising an annular shape and fixed to a corner part between the cylindrical part and the flange part of the seal cover, the seal rubber including: a cylindrical part which is opposed in the radial direction to a space between the end surface of the housing in the axial direction and the flange part; and a recess formed on a surface of the cylindrical part of the seal rubber, an end of the recess opposite the flange part of the seal cover forming a gap between the seal rubber and the inner peripheral surface of the housing; and a slinger comprising a cylindrical part fixed to the inner peripheral surface of the housing which is opposed to the cylindrical part of the seal cover, and a flange part which is formed so as to extend inward in the radial direction from an end part of the cylindrical part in the axial direction and opposed to the flange part of the seal cover in the axial direction, wherein the seal rubber further includes a lip part which is in sliding contact with the flange part of the slinger; and another lip part at the end of the recess facing the inner peripheral surface of the housing.