Automatic belt tensioner

Details Automatic belt tensioner Automatic belt tensioner

1984-06-15

1986-02-18

Leppink, James A.

Endless belt power transmission systems or components

Means for adjusting belt tension or for shifting belt,...

Guide roll mounted for movement of its axis along arcuate...

474135, 474112, F16H 712

Patent

active

045712239

ABSTRACT:
An automatic belt tensioner of the type including a pivoted arm and belt engaging pulley includes an improved tensioning means to maintain a constant tension on a drive belt. A cam having an eccentric portion is wrapped and stretched by an elastomer strap. As the strap stretches, the point of tangency of the wrapped strap varies continuously to vary the effective moment arm of the tensioned strap on the cam, which is rigid to the pivoted arm. The strap tension, and the effective moment arm given by the radius of the point of tangency, are matched at each point to give a constant torque and belt tension.

REFERENCES:
patent: 388729 (1888-08-01), Shive
patent: 3975965 (1976-08-01), Speer
patent: 4145934 (1979-03-01), Sragal
patent: 4270906 (1981-06-01), Kraft et al.
patent: 4299584 (1981-11-01), Sproul
patent: 4351636 (1982-09-01), Hager
patent: 4362525 (1982-12-01), Sproul

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