| 摘要 |
The bearing seal includes a metal core 1 having a radially outer portion engaged in a seal groove 41 formed in a radially inner surface of an outer race 40 of a bearing at its end portion. The metal core 7 includes a bent portion 2 engaged in the seal groove 41, a radially outer flange 3 extending radially inwardly from an end of the bent portion 2 located inside of the bearing, a tapered tubular portion 4 having a large-diameter end thereof connected to a small-diameter end of the radially outer flange 3 and a small-diameter end thereof located axially outwardly of its large-diameter end, and a radially inner flange 5 extending radially inwardly from the small-diameter end of the tapered tubular portion 4. A rubber seal 11 is fixed to an inner surface of the metal core 1 that faces the interior of the bearing. The rubber seal 11 includes a thick-walled portion 12 having a radial step on its radially inner surface, and formed with three lips 13, 14 and 15 that are elastically in contact with the cylindrical radially outer surface 43 of the inner race 42 to increase sealability. The thick-walled portion 12 includes a small-diameter thick-walled portion 12b to increase rigidity of the rubber seal 11. The rubber seal 11 further includes an outer surface covering portion 16 connected to the end of the small-diameter thick-walled portion 12b to increase the bond strength of the rubber seal 11 to the metal core 1. The rubber seal 11 can be formed by a two-piece mold assembly including a lower mold 50 and an upper mold 51 of the type in which when releasing the upper mold 51, the small-diameter thick-walled portion 12b engages an annular portion 61 of the lower mold 50. This reduces cost.
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