| 摘要 |
A chain tensioner includes a tensioner slipper 11 includes a proximal end pivotally moving to press a chain 5 . A restriction member 21 is fixed on a side opposite to the chain 5 relative to the tensioner slipper 11 . The tensioner slipper 11 and the restriction member 21 have mutually opposing surfaces 11 a, 21 a formed to narrow gradually toward a center of pivotal motion of the tensioner slipper 11 . A roller 15 is sandwiched between the tensioner slipper 11 and the restriction member 21 . The roller 15 is urged by a spring 25 toward a side of the center 24 of pivotal motion of the tensioner slipper 11.
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