Device for the automatic shifting of a tensioning roller

Details Device for the automatic shifting of a tensioning roller Device for the automatic shifting of a tensioning roller

1988-06-22

1989-06-27

Bui, Thuy M.

Endless belt power transmission systems or components

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

Pulley shifter

474133, F16H 708

Patent

active

048425702

ABSTRACT:
For maintaining a desired level of belt tension upon a change in the spacing of belt rollers on which the belt is trained, which results from heating of the housing that supports at least one of the rollers of the belt, the tensioning roller for the belt is supported on a pivot plate or rocker arm. The plate has a pivot and the tensioning roller is mounted on the plate eccentric of the pivot of the plate. A connecting rod extends between the pivoting plate and a connection point. The connecting rod has a different coefficient of thermal expansion than that of the housing on which the belt roller is supported, whereby as the heat caused expansion of the housing moves the belt rollers apart, the connecting rod pivots the plate for the tensioning roller in a direction and to an extent to maintain a desired, e.g. substantially constant tension level on the belt. Or, the connecting rod and tensioning roller may be positioned for altering the level of tension during heat-caused expansion, e.g., increasing that tension.

REFERENCES:
patent: 2679112 (1954-05-01), Thompson
patent: 2888829 (1959-06-01), Roehm
patent: 4530682 (1985-07-01), Gruber et al.
patent: 4531348 (1985-07-01), Vilder et al.

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