A tensioner comprising a base, a pivot arm pivotally engaged with the base, a torsion spring engaged between the base and the pivot arm for biasing the pivot arm, a first damping member and a second damping member disposed between the pivot arm and the base, the first damping member wedgingly engagable between the pivot arm and the second damping member, and the second damping member frictionally engaged between the first damping member and the base.
1. A tensioner comprising:
a base;
a pivot arm pivotally engaged with the base;
a torsion spring engaged between the base and the pivot arm for biasing the pivot arm;
a first damping member and a second damping member disposed between the pivot arm and the base;
the first damper comprising a ring with a plurality of planar members distributed around the circumference of the ring, each planar members engaged with the ring for a partial rotation thereon, each of the plurality of planar members having a first surface for frictionally engaging a pivot arm surface and an opposing second surface engagable with the second damping member;
the second damping member comprising a radially extending flange frictionally engaged between a first portion surface and a second portion surface, the first portion surface fixed to the base;
the torsion spring is in pressing engagement with the second damping member against the base; and
the second damping member frictionally engaged between the first damping member and the base.
2. The tensioner as in claim 1 , wherein the first damping member comprises an elastomeric material.
3. The tensioner as in claim 1 , wherein:
the planar members are disposed at an angle (α) in the range of approximately 25° to approximately 65°; and
angle (α) is determined with respect to a point on a radius (R) located at a distance of ⅓R from the ring.