Importance

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Abstract

A belt tensioner has a tensioner and a tensioner arm. The tensioner cup has an opening, and the tensioner arm has a lid portion formed at one end. The lid portion is rotatably connected to the cup and extends so as to close the opening thereof. The tensioner also has a torsion spring provided in the cup to act between the cup and the arm so as to elastically urge the arm in a rotational direction. A damping member is secured to the lid portion of the arm such that an outer circumferential surface of the damping member is in sliding contact with an inner circumferential surface of the cup. Further, the tensioner has a ring-like spring provided in the damping member so as to elastically urge the damping member against the inner circumferential surface of the cup. The lid portion of the arm has at least two columnar pin-like elements protruding therefrom parallel with a swing axis of the lid portion of the arm, and the columnar pin-like elements are inserted in holes formed in the damping member. Thus, the damping member is prevented from being moved in both the rotational and radial directions with respect to the lid portion of the arm.

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First Claim