Endless belt power transmission systems or components – Pulley with belt-receiving groove formed by drive faces on... – Plural members forming plural belt-receiving grooves on...
Patent
1989-03-28
1990-07-17
Bui, Thuy M.
Endless belt power transmission systems or components
Pulley with belt-receiving groove formed by drive faces on...
Plural members forming plural belt-receiving grooves on...
474 86, F16H 916
Patent
active
049418637
ABSTRACT:
A stepless speed change mechanism in a belt transmission device comprising a first belt passed through a groove in a drive pulley and a first groove in an intermediate pulley, and a second belt passed through a second groove in the intermediate pulley and a groove in a driven pulley for transmitting rotation from the drive pulley to the driven pulley via the intermediate pulley. The first groove and the second groove of the intermediate pulley have an axial width gradually decreasing radially inwardly of the pulley. A partition provided between and defining the first and second grooves of the intermediate pulley is movable axially of the pulley to thereby vary the pitch diameter of each of the first and second grooves and steplessly change the speed of rotation to be transmitted from the drive pulley to the driven pulley. The state of contact of the first belt with the first groove portion is adjusted to be different from the state of contact of the second belt with the second groove portion so that when the partition moves axially for the speed change, the axial component of the pushing force exerted on the partition by one of the first and second belts differs in magnitude from the axial component of the reaction force exerted on the partition by the other belt.
REFERENCES:
patent: 2536483 (1951-01-01), Young
patent: 2954709 (1960-10-01), Heckel et al.
patent: 3145584 (1964-08-01), Fairbank et al.
patent: 3728905 (1973-04-01), Fell et al.
patent: 4674994 (1987-06-01), Tomiyori et al.
Dei Yosihito
Fukumoto Katsumi
Furukawa Kazuo
Kawasaki Masami
Sampei Keiichi
Bui Thuy M.
Kubota Ltd.
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