Land vehicles – Wheeled – Running gear
Patent
1997-04-21
1999-08-17
English, Peter C.
Land vehicles
Wheeled
Running gear
280124134, 280788, 267293, 2671417, B60G 702
Patent
active
059382201
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a front wheel suspension arrangement for motor vehicles, and more particularly a McPherson type front wheel suspension.
BACKGROUND OF THE INVENTION
Front wheel suspensions of the McPherson type for motor vehicles are available in various embodiments and imply that the vehicle wheels, by means of such a suspension, are individually suspended by means of so-called spring struts, the upper parts of which are pivotably arranged in the vehicle body and the lower parts of which carry a wheel axle and are also rotatably and pivotably arranged in the vehicle body via a suspension arm. A common type of suspension arm presents three anchoring points, of which the two inner anchoring points form the pivotable mounting in the vehicle body of the suspension arm. The pivotal movement of the suspension arm in the vehicle body generally takes place about a geometrical suspension arm axis which extends essentially in the longitudinal direction of the vehicle. Accordingly, the two pivot means are usually designed as two bushings, the geometrical axes of which extend generally in the longitudinal direction of the vehicle. Since demands regarding assembly time are continually increasing, it has been noted that previously known solutions have implied difficulties regarding simultaneous fitting of different components of two pivoting means, and has more or less also required a millimeter accuracy of the relative positions of the components, so as to allow an assembly to be carried out.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the above-mentioned drawbacks and consequently provide shorter assembly times, at the same time that reasonable requirements can be made regarding the precision of the relative positions of the components during the assembly stage.
Said object is accomplished by means of a device according to the present invention, which provides a McPherson strut suspension arrangement for a front wheel of a motor vehicle having a vehicle body and a spring strut supporting the front wheel on the motor vehicle. The spring strut has a lower portion and a suspension arm having a plurality of anchoring points including an inner, rear anchoring point. The rear anchoring point includes a seat for pivotably connecting the suspension arm to the vehicle body to allow rotation about a suspension arm axis extending essentially in a longitudinal direction of the vehicle. The rear anchoring point includes a rear pivot device constructed around a geometric axis transverse to a roll plane of the vehicle and the suspension arm axis. The rear pivot device comprises a central holding element arranged co-axially with the geometric axis and includes at least one conical portion fixed on the vehicle body and facing downwardly and narrowing in a downwards direction and an elastic bushing element mounted in the seat and including a cavity adapted to the shape and dimensions of the holding element. The bushing element allows pivotal movement of the suspension arm, and the cavity serves as a guide for the elastic bushing element during assembly of the suspension arm on the vehicle body.
The holding element of the suspension arrangement may include an upper conical portion and a lower conical portion, each having the shape of truncated cones having a wider end and a narrow end. The upper conical portion includes a first co-axial bore and is adapted to be inserted from above the bushing element. The lower conical portion includes a second co-axial bore and is adapted to be inserted from below the bushing element. Upon assembly, the narrow ends of the upper and lower conical portions are disposed adjacent one another in the cavity of the bushing element. The cavity is adapted to the shape and dimensions of the upper and lower conical portions.
The suspension arrangement may include a cross member connected to the vehicle body so that the lower conical portion is fixed on the cross member. The cross member may include a hole and a holding screw associated with
REFERENCES:
patent: 4030714 (1977-06-01), Kleinschmit et al.
AB Volvo
English Peter C.
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