Patent ID: 7972233

Claim:
A bearing roller chain with a pair of inner link plates having bush holes, a bush having both ends fit-secured into said bush holes, a bearing roller rotatable on said bush, and a seal mechanism between each end of said bearing roller and the adjacent inner link plate, wherein said bearing roller comprises a hollow first roller with an inner circumferential surface with inward flanges at both ends, and end surfaces with annular concave grooves concentric with said bearing, and a plurality of second anti-friction rollers disposed between said first roller and said bush in parallel with said bush, said bearing roller further comprising side rings at both ends of said bearing roller, each side ring having one side adjacent an end surface of said second anti-friction roller and another side confronting the inner surface of the associated link plate, said seal mechanism comprises an annular seal member, a spacer, and a disk-shaped seal member having a flange extended toward the confronting end surface of said hollow roller, said annular seal member and said spacer and said disk-shaped seal member being sequentially disposed between the ends of said anti-friction rollers and said inner link plate, said annular seal member having an annular base portion and plurality of lip portions extending from said base portion in a forked manner, one of said lip portions coming into close contact with said side ring, another of said lip portions coming into close contact with said spacer, each of said inward flanges having a cavity confronting said seal mechanism, said annular base portion being mounted in said cavity, said flange of the disk-shaped seal member entering said annular concave groove concentrically, thereby forming a labyrinth structure enhancing the performance of said seal mechanism.