Thin autotensioner
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United States of America Patent
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Sep 15, 2009
Grant Date -
Nov 28, 2002
app pub date -
Sep 25, 2001
filing date -
Apr 13, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An autotensioner comprises a torsion coil spring interposed between a base and a rocking arm, and a tubular bushing provided between an inside surface of the base and an outside surface of the rocking arm. The torsion coil spring pushes and biases the rocking arm toward the bushing, and brings the pushing direction substantially in coincidence with the axial load direction of the force, acting on a stepped bolt supporting the rocking arm, from a belt. When the belt tension becomes high, the arm axial center displaces slightly from the base axial center, an extremely large first damping force acts on the rocking arm. When the belt tension becomes low, the smaller second damping force acts on the rocking arm.
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