Variable speed bicycle automatic torque converter transmission

Details Variable speed bicycle automatic torque converter transmission Variable speed bicycle automatic torque converter transmission

1990-08-20

1991-10-29

Bui, Thuy M.

Endless belt power transmission systems or components

Plural belts or plural output loads

474 86, 474 89, F16H 700

Patent

active

050612247

ABSTRACT:
A fully automatic torque converter transmission is presented that uses a "V" belt with inner teeth that engage mating teeth on a variable pitch pulley core in a low speed high torque state transformable into an infinitely variable higher speed shift mechanism. The bicycle pedal sprocket drives a pivoted cluster of three small sprockets with a drive chain loop interconnect driving a first sprocket as a driven member, and the other two serving as idlers in maintaining the chain at constant length. A speed ratio of approximately 1:6 from the pedal sprocket to the driven sprocket optimizes torque transmission capacity of the system with the driven sprocket attached to a self-centering, spring loaded, variable pitch pulley. This pulley has a core shaped like a timing belt pulley with grooves (or teeth) at its surface. The "V" belt driven by the variable pitch pulley drives a timing belt type pulley that rotates on a center fixed relative to the bicycle frame, and is a "V" belt with teeth on its inner surface enabling engagement with the variable pitch pulley core at the low speed high torque position. This converts the friction "V" belt drive to a positive drive in low gear. The driven pulley, finally, drives the rear wheel through a conventional bicycle chain.

REFERENCES:
patent: 2560991 (1951-07-01), Schuricht
patent: 2633030 (1953-03-01), Colden
patent: 4397369 (1983-08-01), Read
patent: 4712789 (1987-12-01), Brilando

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