Motor vehicles – Having four wheels driven
Patent
1989-12-19
1991-01-08
Hill, Mitchell J.
Motor vehicles
Having four wheels driven
192 58B, 192 58C, 280248, 280249, 475 89, F16D 3500
Patent
active
049828088
ABSTRACT:
A viscous shear coupling, comprising a first part in the form of a housing (2), a second part (3) disposed within the housing to define an annular closure therebetween, a first set of annular plates (11) in the enclosure secured for rotation with the first coupling part interleaved with the plates (12) of a second set of plates, secured for rotation with the second coupling part (3) and a viscous liquid at least partially filling the enclosure, wherein the plates are provided with through slots (13, 14) which are arranged so that parts of the slots move into and out of area of axial alignment as the sets of plates rotate relative to one another. The slots in one set of plates are inclined to the radii of the plates, while the slots in the other set of plates may be radial such that in one direction of rotation of the first set of plates relative to the second set of plates the axially aligned areas of the slots of two adjacent plates move inwardly towards said axis, and in the opposite direction of rotation of the first set of plates relative to the second of plates the axially aligned areas of the slots of two adjacent plates move outwardly away from said axis. The coupling is able to transmit differing torques according to the direction of relative rotation between the plates, so that it is useful for an inter-axle drive line in a four-wheel drive motor vehicle.
REFERENCES:
patent: 3025686 (1962-03-01), Lewis
patent: 4040271 (1977-08-01), Rolt et al.
patent: 4096712 (1978-06-01), Webb
patent: 4605087 (1986-08-01), Ashauer et al.
patent: 4650028 (1987-03-01), Eastman et al.
patent: 4736828 (1988-04-01), Diessner
Klein Heinz
Taureg Herbert
Hill Mitchell J.
Viscodrive GmbH
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