Machine element or mechanism – Elements – Gear casings
Patent
1982-12-03
1984-09-11
Herrmann, Allan D.
Machine element or mechanism
Elements
Gear casings
74331, 74359, 74701, 74705, F16H 3700, F16H 308, F16H 3708, F16H 3706
Patent
active
044703260
ABSTRACT:
A power transmission has a variable belt drive, a two-speed planetary gear arrangement and a countershaft type gear arrangement disposed in combination to provide a continuously variable synchronously shifting transmission. The planetary gear arrangement and the variable belt drive are disposed in parallel drive relationship thereby reducing the belt load. The planetary gear arrangement has two output members selectively connectible via clutches with respective countershafts in the countershaft type gear arrangement. The countershafts support selectively engageable ratio gears which mesh with respective drive gears on the transmission output shaft in a manner to provide pairs of identical gear ratios between the shafts such that ratios on each countershaft may be simultaneously engaged and the output clutches of the planetary gear set can be interchanged at a synchronous speed point to permit a ratio change. Speed change within any given gear ratio is provided by controlling the ratio of the belt drive. In one gear ratio, the output speed of the belt drive is increased to provide an increased transmission speed while in the next succeeding ratio, the output speed of the belt drive is decreased to provide an increase in the transmission output speed. The transmission is usable with a constant speed prime mover to provide a continuously variable speed range for a vehicle which is greater than the continuously variable speed range for any given speed ratio.
REFERENCES:
patent: 2833160 (1958-05-01), Morgan
patent: 3031893 (1962-05-01), Doleschalek
patent: 3340749 (1967-09-01), Magg et al.
patent: 3375733 (1968-04-01), Browning
patent: 3470769 (1969-10-01), Livezey
patent: 3479908 (1969-11-01), Kress et al.
patent: 3527119 (1970-09-01), Nasvytis
patent: 4089237 (1978-05-01), Scholz
Andrews Stephen B.
General Motors Corporation
Herrmann Allan D.
Scherer Donald F.
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