Electronic four-wheel drive transmission

Motor vehicles – Having four wheels driven – Including separate mechanical assemblies for transmitting...

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Details

192 6982, 192 91A, B60K 17354

Patent

active

061316865

ABSTRACT:
A transmission is described for a motor vehicle having selectable four-wheel drive. The transmission includes a coupling for selectively applying torque to the front wheels of the vehicle to switch between two-wheel drive and four-wheels drive in dependence upon slipping of the driven wheels. The coupling includes a drive member rotatable with the rear wheels, a driven member rotatable with the front wheels, the drive and driven members being movable axially relative to one another. The drive and driven member have teeth which mesh with one another in a first relative axial position of the drive and driven members to transmit torque from the drive to the driven member, but which are disengaged from one another in a second relative axial position of the drive and driven members to disconnect the drive to the front wheels. Slipping of the rear wheels is sensed electronically and is used to move the drive and driven members axially between the first and second relative positions in dependence upon the determined presence or absence of slipping of the driven wheels.

REFERENCES:
patent: 4848508 (1989-07-01), Smirle et al.
patent: 5199325 (1993-04-01), Reuter et al.
patent: 5330030 (1994-07-01), Eastman et al.
patent: 5492194 (1996-02-01), McGinn et al.
patent: 5799749 (1998-09-01), Yamamoto et al.
patent: 5853342 (1998-12-01), Pritchard et al.

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