| 摘要 |
A camshaft driving mechanism in an internal combustion engine is disclosed. It comprises a crank sprocket, a cam sprocket and an idler sprocket disposed therebetween, a first timing chain entrained on the crank sprocket and idler sprocket, and a second timing chain entrained on said idler sprocket and cam sprocket. The improvement resides in that the first timing chain is sized smaller than the second timing chain.
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