Transfer case with four-wheel underdrive operating mode

Details Transfer case with four-wheel underdrive operating mode Transfer case with four-wheel underdrive operating mode

1998-11-13

1999-11-16

Wright, Dirk

Planetary gear transmission systems or components

Variable speed or direction transmission combined with...

Variable speed or direction is planetary transmission

475206, F16H 4824

Patent

active

059848219

ABSTRACT:
A transfer case for a four-wheel drive vehicle includes a center differential which provides a direct output in two-wheel drive and a slightly reduced speed output in four-wheel drive. In two-wheel drive, the outputs of the center differential are locked together by a clutch collar and drive torque is provided to the primary drive line only. In four-wheel drive, the clutch collar unlocks the differential and couples the output from a sun gear to a chain drive sprocket in the secondary drive line. The center differential is driven through the carrier and operates as an open differential. The ring (outer) gear drives the primary drive line and the sun (center) gear drives the secondary drive line through cooperating chain sprockets and a chain. The chain drive sprockets are of unequal size and effect a speed reduction between the drive and driven sprockets. This speed reduction is nominally the same as the speed reduction from the input to the primary output achieved through the center differential. Thus, in four-wheel drive mode, the drive (speed reduction) ratio through the drive lines is raised, improving the acceleration and pulling power of the vehicle. In two-wheel drive, more favorable fuel economy is provided with the lower drive ratio.

REFERENCES:
patent: 4103753 (1978-08-01), Holdeman
patent: 4422349 (1983-12-01), Matsumoto et al.
patent: 4458557 (1984-07-01), Hayakawa
patent: 4878399 (1989-11-01), Kameda
patent: 5006098 (1991-04-01), Yoshinaka et al.
patent: 5046998 (1991-09-01), Frost
patent: 5078660 (1992-01-01), Williams et al.
patent: 5106351 (1992-04-01), Williams et al.
patent: 5499951 (1996-03-01), Showalter

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