Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Impeller-turbine type fluid circuit and mechanical path in...
Patent
1990-01-17
1991-07-09
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Impeller-turbine type fluid circuit and mechanical path in...
475 52, 74333, 747321, F16H 308
Patent
active
050301799
ABSTRACT:
A manually-shifted transmission for use in passenger cars and trucks includes a number of constantly-meshed pairs of gears for coupling one shaft to another through a dog clutch on the power output gear of each gear pair. Also included in this basic configuration of the invention are a motorcycle-style shift drum which controls engagement of the dog clutches, a sprag clutch on the power input side of the gear pairs and a wet, multi-disc clutch on the power output side. Since the multi-disc clutch is disengaged for gearshifting, the total gearshift load accelerated or decelerated by the dog clutches is very low and includes none of the gear pairs. The resulting very rapid change from engagement of one gear pair to engagement of another, in conjuction with automatic engagement and disengagement action of the sprag clutch, allows full-power downshifting of the transmission. A variation of this configuration of the invention further includes a fluid coupling which removes the strain of vehicle startup from the multi-disc gearshift clutch, and a different configuration suggestive of twin-countershaft transmissions has full powershift capability.
REFERENCES:
patent: 2400540 (1946-05-01), Chilton
patent: 3246542 (1966-04-01), Moan
patent: 4693129 (1987-09-01), Pierce
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