Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1976-07-19
1978-12-05
Scott, Samuel
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
192 8717, 192 91A, F16H 344, F16D 2500
Patent
active
041280237
ABSTRACT:
A two-speed transmission unit which couples a rotatable input shaft to a rotatable output shaft. A gear unit includes a sun gear fixed to the input shaft and rotatable therewith. One or more planet gears are disposed for orbital motion around the sun gear, and the planet gears are carried by a planet carrier which orbits with the planet gears about the sun gear. First clutch means is provided for coupling the sun gear to the output shaft for rotating the output shaft at a first angular velocity equal to the angular velocity of the sun gear, and second clutch means is provided for coupling the planet carrier to the output shaft for rotating the output shaft at a second angular velocity equal to the angular velocity of the planet carrier about the sun gear. Both the first and second clutch means are continually biased into engaged condition, and means are provided for (1) selectively placing one clutch means in a disengaged condition and allowing the biasing means to place the other in engaged condition, or (2) placing both clutch means in a disengaged condition, thereby allowing "free wheeling" of the input shaft. There is also provided a fail-safe brake to lock the input and output shafts against rotation when neither clutch means is placed in its disengaged condition.
REFERENCES:
patent: 1410384 (1922-03-01), Martino
patent: 2428128 (1947-09-01), Sheppard
patent: 2465885 (1949-03-01), Koster et al.
patent: 3074297 (1963-01-01), Sommer et al.
patent: 3710650 (1973-01-01), Piret
patent: 3834498 (1974-09-01), Ashfield
patent: 3893556 (1975-07-01), Lech, Jr. et al.
Chandler Lance W.
Scott Samuel
TRW Inc.
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