Patent ID: 8613680

Claim:
A tensioner comprising: a pivot shaft; a pivot arm pivotally mounted on the pivot shaft and defining a groove; a torsion spring that biases the pivot arm about the pivot shaft in a first rotational direction, the torsion spring being a closing-type torsion spring with a plurality of coils that are received about the pivot shaft; a stop sleeve received over the pivot shaft and within the torsion spring, the stop sleeve having a tongue that is received into the groove in the pivot arm, the tongue being smaller than the groove to permit a predetermined amount of movement of the pivot arm relative to the stop sleeve; a first clamp sleeve mounted over the pivot shaft and rotatably coupled to the stop sleeve; a wrap spring having a first end, which is fixedly coupled to the first clamp sleeve, and a plurality of helical coils that are disposed about the stop sleeve; a second clamp sleeve mounted over the pivot shaft and abutting the first clamp sleeve on a side opposite the stop sleeve, the second clamp sleeve being non-rotatably coupled to the first clamp sleeve; at least one damper coupled to the second clamp sleeve and configured to be in continuous contact with an inside surface of the coils of the torsion spring, the at least one damper being formed of a resilient material and deflecting inwardly with increasing torque transmitted through the torsion spring; and a friction clamp housed between the first and second clamp sleeves, the friction clamp frictionally engaging the pivot shaft; wherein the at least one damper comprises a first end member and a damping member, the first end member being fixed to the second clamp sleeve, the damping member being coupled to the first end member at a first lateral side and extending laterally away from the first end member in a circumferential direction such that a radial space is defined between the damping member and the second clamp sleeve.