<p>Subject: To reduce a load of a tensioner lifter, enhancing the oscillation absorption function of the tensioner lifter in a chain tensioner.</p><p>Solving Means: In a chain tensioner provided with a tensioner arm(16)rockably supported by fixed structure (Ea) and relatively slidably touched to the outside on the loose side of a transmission chain (14) without an end coupling a driving sprocket (11) and a driven sprocket (12) and a tensioner lifter (18) supported by the fixed structure (Ea) for pressing the tensioner arm (16) on the side of the transmission chain (14), a control arm (17) rockably supportedby the fixed structure (Ea) for transmitting the pressure of the tensioner lifter(18)to the tensioner arm (16) is inserted between the tensioner arm (16) and the tensioner lifter(18)
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