Patent ID: 8356942

Claim:
A bearing sealing device for sealing between outer and inner members of a wheel support bearing assembly, which are rotatable relative to each other through rolling elements, which device comprises: an annular sealing plate fitted to the inner member; an annular elastic sealing member fitted to the outer member; the annular sealing plate and the annular elastic sealing member confronting with each other; the sealing plate being made of a metallic material and having an L-shaped section including a first cylindrical wall, mounted on an outer periphery of the inner member, and a first radial upright wall protruding radially outwardly from one end of the first cylindrical wall; the elastic sealing member including an annular core metal and an elastic body secured to the core metal; the core metal being opposed to the sealing plate and being of an L-shaped section including a second cylindrical wall, which is mounted on an inner peripheral surface of the outer member, and a second radial upright wall extending radially inwardly from one end of the second cylindrical wall; the elastic body including two side sealing lips juxtaposed radially inwardly and outwardly on the core metal, and having respective tips held in contact with the first radial upright wall of the sealing plate; a sealing device sectional height H, which is a radial length as measured from an inner diametric surface of the sealing plate to an outer diametric surface of the elastic sealing member, being within a range of 6 to 8 mm and a distance between the two side sealing lips being within a range of 0.1 to 2.0 mm; and a ratio H/B of the sealing device sectional height H relative to a sealing device width B, which is an axial dimension of a combination of the sealing plate and the elastic sealing member, is within a range of 1.2 to 1.8.