| 摘要 |
PROBLEM TO BE SOLVED: To provide an auto tensioner which more effectively absorbs fluctuation of belt tension. SOLUTION: This auto tensioner 1 includes a swinging arm provided with a base end part 3 having an outer raceway surface 31 formed on the inner periphery and with an arm extending from the base end part 3 and having a rotatably fixed pulley around which a belt is wound; a support member 2 having an inside raceway surface 21 in the outer peripheral side and supporting the swinging arm so as to freely swings it by relatively rotatably supporting the base end part 3; and cylindrical rollers 4 interposed between the outside raceway surface 31 and the inside raceway surface 21 so as to be freely rolled. On the inside raceway surface 21 and the outside raceway surface 31, respective raceway surfaces 2k, 3k of different shapes are formed to gradually narrow nipping intervals of the cylindrical rollers 4 while rolling the cylindrical rollers 4 along with the relative rotation of the base end part 3 and the support member 2 and apply rotation energizing force in a direction canceling a phase difference between the base end part 3 and the support member 2 generated by the relative rotation between the base end part 3 and support member 2. Due to this rotation energizing force, the swinging arm is energized in a predetermined swinging direction. COPYRIGHT: (C)2007,JPO&INPIT
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