Motor vehicles – Transmission mechanism – Final drive axle movable
Patent
1997-01-22
1998-11-10
English, Peter C.
Motor vehicles
Transmission mechanism
Final drive axle movable
180362, 280124107, 280124109, 280124128, 280124135, 280124153, 280124156, 280124171, B60K 1716, B60G 318, B60G 1108, B60G 21055
Patent
active
058330267
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a wheel suspension for a pair of driven motor vehicle wheels, comprising a member intended to be fixed to a vehicle undercarriage, for each wheel an upper and a lower link arm pivotally joined to a wheel carrier, a longitudinal bar pivotally connectable to the vehicle undercarriage and pivotally connected to the wheel carrier, a slotted rod pivotally joined to the member and to the respective wheel carrier, spring means acting between the respective wheel carrier and the member, shock absorbers and an anti-roll bar, a differential carried by the member, and a pair of wheel axles driven by the differential transmission, said axles each being joined to an individual wheel hub mounted in the respective wheel carrier.
DESCRIPTION OF THE RELATED ART
SE-A-458 514, for example, describes a wheel suspension of the type described by way of introduction, which provides high comfort and good road properties in the vehicle by, among other things, achieving stabilization and equalization of forces affecting the rear wheels, in order to avoid undesired steering of the rear wheels. Furthermore, the known wheel suspension provides a relatively large amount of space for various installations in the area around the rear wheels.
The wheel suspension known by SE-A-458 514 has a member system comprised of a plurality of pressed sheet metal parts which are welded together. In order to compensate for unavoidable tolerance deviations, the lower link arm and the slotted rod are fixed to the member by means of bolts with excentric bushings, so that the correct camber angle and toe-in of the wheels can be adjusted after mounting.
The differential is screwed securely to the member. The longitudinal arms act as supporting arms for the wheel spring system and helical springs arranged concentrically therewith, said springs resting against seats on the tops of the supporting arms. An anti-roll bar is joined to the member on the rear side of the member via links with caps screwed securely over the rubber bushings, which grip over the anti-roll bar.
SUMMARY OF THE INVENTION
The purpose of the present invention is to achieve a wheel suspension of the type described by way of introduction, which, while retaining the positive features of the known wheel suspension described above as regards comfort and ride can be manufactured at lower cost and be made lighter.
This is achieved according to the invention by virtue of the fact that the member comprises an upper and a lower member element, said elements being screwed securely to each other and fixing the differential between them via elastic damping elements.
A cast aluminum member system can be manufactured with much closer tolerances than the previously known system consisting of pressed sheet metal components which are welded together. This also means that the link arm and the slotted rod can be joined to the member by means of screw fasteners which are free of play, e.g. serration screws, since after-adjustment will no longer be needed. By clamping the differential between the upper and lower member elements, simple assembly is achieved. No through-fixing elements are required to keep the differential in place, only screw fasteners which hold the member elements together.
In a wheel suspension of the type described by way of introduction, by replacing, in accordance with the invention, the conventional helical springs of the suspension with a transverse leaf spring, which has a central portion securely fixed to the member and end portions acting against a top side of each lower link arm, it is possible to achieve a design which saves weight and space. By virtue of the fact that the longitudinal bars no longer need to serve as supporting arms for the wheel springs but are primarily bars for fixing the wheel carrier in the longitudinal direction of the vehicle, their design can be simplified and their dimensions be reduced.
The free space in front of the member between the longitudinal bars can be used with advantage for a U-
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Sjosten Kjell
Zetterstrom Sigvard
AB Volvo
English Peter C.
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