| 摘要 |
PURPOSE:To reduce knocking sound generated in contacting and increase mechanical strength and durability by constructing rollers fit to each bush connected by links by combination of material having mechanical strength and durability of material having noise preventing effect. CONSTITUTION:Each bush 3 is connected by links 1, 2 and a roller 4 made of three parts is fit to each bush. And material a having mechanical strength and durability and material b reducing knocking sound generated in contacting of a sprocket and the roller are alternately placed. |
