Four-wheel motor vehicle drive transfer case with limited differ

Details Four-wheel motor vehicle drive transfer case with limited differ Four-wheel motor vehicle drive transfer case with limited differ

1996-07-30

1998-04-14

Wright, Dirk

Planetary gear transmission systems or components

Variable speed or direction transmission combined with...

Transmission output shaft parallel to differential output...

180249, F16H 4802, F16H 4824

Patent

active

057386048

ABSTRACT:
A four-wheel motor vehicle drive transfer case with limited differentiation is designed to provide full time four-wheel drive and limit slip or differentiation between the rear and front wheels of a motor vehicle using a mechanical system. The torque transfer case allows differentiation between the front and the rear wheels of the motor vehicle up to a predetermined threshold and thereafter prevents differentiation so that the torque to the axle with the slipping wheels is redirected and transmitted to the axle with the non-slipping wheels. Preferably, an interaxle differential in the torque transfer case locks whenever the rear output shaft attempts to overrun the front output shaft. Also, the torque transfer case preferably allows the front drive shaft to overrun the rear drive shaft by that amount that occurs during "normal" motor vehicle turning and cornering operations or that amount which may occur due to differences in tire static loaded radius and thereafter locks the interaxle differential to prevent any further differentiation.

REFERENCES:
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patent: 5038884 (1991-08-01), Hamada et al.
patent: 5226860 (1993-07-01), Baxter, Jr. et al.
patent: 5409429 (1995-04-01), Showalter et al.

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