Wheel suspension

The present invention relates to a wheel suspension for a rear wheel of a Motor vehicle according to the preamble of claim 1.

Such suspension is already known in several versions. A Such a known suspension has a trailing arm, which extends in the direction Vehicle longitudinally extending and three transverse links, which are largely in the direction of Transverse vehicle axis extend. In such a known suspension form two lower wishbones a load level and the distance from it runs the top Wishbone. In such a known suspension of the upper arm is cranked formed so that it passes under a longitudinal support of the bodywork of the motor vehicle is running and stored inside the beam, for example, in a rubber mount.

Such a known suspension leads during compression and rebound of at Body articulated suspension to a zero crossing of the camber angle and thus a gauge change between the two rear wheels of the vehicle. Due to the associated displacements of the respective Radaufstandpunktes there is a negative impact on the straight driving characteristics of the vehicle.

Proceeding from this, the present invention based on the object, the further develop known wheel suspension in such a way that the vehicle is improved Straight driving has.

The invention is for this purpose the features given in claim 1. on. Advantageous embodiments thereof are described in the further claims.

According to the invention now is a suspension for a rear wheel of a motor vehicle provided with a largely extending in the vehicle longitudinal direction Trailing arm and three largely extending transversely to the vehicle longitudinal direction Wishbones, two of which are arranged in a lower plane and in an the upper plane is arranged at a distance therefrom and the transverse control arms on a common Wheel are articulated, and the upper wishbone of the shortest of the three transverse links.

This short training of the upper arm surprisingly leads to a situation in Operation of the so-equipped vehicle both during compression and during Rebound of the suspension, a negative camber angle is adjusted and this clearly lower gauge changes as in a prior to the wheel suspension equipped vehicle comes.

According to the invention it is provided that the upper transverse link has such a length including that his body-side articulation point viewed in the vehicle longitudinal direction is arranged outside a longitudinal member of the vehicle. This allows for a Forming the upper arm as a straight rod, which reduces fabrication costs significantly reduced.

The invention is illustrated below with reference to the drawing. This shows in:<sl><li>Fig. 1 a perspective view of a wheel suspension according to the invention according to a first embodiment; and</li><li>Figure 2 according to a second embodiment.</li><li>Fig. 3A is a representation of the camber angle during compression and rebound of the Arm compared to the camber angle of a known wheel suspension; and</li><li>Fig. 3B is a representation of the gauge change during compression and rebound of the suspension in comparison to a known suspension.</li></sl>

The first embodiment of the invention shown in Fig. 1 of the drawing Suspension has a trailing arm 1, a lower short wishbone 2 and a lower long wishbones 3 and a rod as just formed upper Wishbone 4.

The upper wishbone 4 is the shortest of the three wishbones the illustrated Suspension. The trailing arm 1 and the three transverse links 2, 3, 4 each have a Articulation 5 through which the respective arm of example, in a rubber bearing on Body can be articulated.

About the respective articulation points 5 opposing pivot points are the Trailing arm 1 and the wishbone arranged on a wheel carrier. 8

A schematically illustrated spring 6 and a shock absorber 7 provide a spring damper System represents.

The suspension shown in FIG. 2 of the drawing is different from the Suspension of FIG. 1 in that all the wishbones are made longer than the corresponding to Fig. 1, and thereby to lower the transverse displacements Radaufstandpunkte comes. In addition, the upper cross member 10 is cranked formed is but still the shortest of the three transverse links. It is noted that in both Embodiments, the articulation points opposite the wheel of The trailing arm 1, the lower shorter transverse link 2 and 11 and the lower longer Wishbone 3 and 9 are to a large extent a straight line, so that in this way the geometric relationships between the two lower arms are set can.

Fig. 3A now shows a representation of the camber angle during compression and rebound of the A wheel suspension according to the invention a known compared to the camber angle Suspension and FIG. 3B is a representation corresponding to the track width change during compression and rebound of the suspension compared to a known Suspension.

As is readily apparent with reference to FIG. 3A, the camber angle is the A wheel suspension according to the invention, ie with a short handlebar, during the entire Spring range jounce and rebound the negative, while the camber angle of the known suspension with a long upper wishbone from negative to positive area changes and thus in particular during rebounding a negative Gauge change results, which leads to poor driving straight. Fig. 3 B of the drawing now shows the connection just described with reference to a Representation of the gauge change. This remains in suspension after Invention with the short wishbone over the entire spring area significantly smaller than in the known wheel suspension with long wishbones, so that the benefits of Arm are now significantly according to the invention.

The suspension is also characterized in that the body-side Points at which the three transverse links within the rim well diameter corresponding radius at a substantially horizontally extending from the two lower wishbone plane spanned are arranged so that a pronounced compact arrangement of the articulation points is possible.

Regarding further features and advantages of the present invention is in the rest expressly refer to the claims and drawings.

LIST OF REFERENCE NUMBERS

<dl tsize="2" compact="compact"><dt>1</dt><dd>Trailing arm</dd><dt>2</dt><dd>wishbone</dd><dt>3</dt><dd>wishbone</dd><dt>4</dt><dd>wishbone</dd><dt>5</dt><dd>articulation</dd><dt>6</dt><dd>feather</dd><dt>7</dt><dd>shock absorber</dd><dt>8th</dt><dd>wheel carrier</dd><dt>9</dt><dd>wishbone</dd><dt>10</dt><dd>wishbone</dd><dt>11</dt><dd>wishbone</dd></dl>