| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that breakage of a seal ring occurs in an early stage when providing the seal ring between a roller and an inner link plate, so that impact force from a sprocket teeth directly works on the seal ring. SOLUTION: A recessed part 15 is provided on an inside face of an inner link plate 4, a recessed groove 16 in a ring shape is formed on a bottom face 15a of the recessed part and the seal ring 19 is fit into the recessed groove. The seal ring 19 is contacted to the seal plate 17 loosely fit to an end face of the roller 6 and a bearing part E of the roller 6 is sealed. The seal plate 17, its loose fit part f and the seal ring 19 do not interfere with the sprocket teeth even in the case that a roller outer peripheral face is worn. COPYRIGHT: (C)2006,JPO&NCIPI
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