DE102017204278A1 - Control arm for a wheel suspension of a motor vehicle - Google Patents

Abstract

The invention relates to a transverse link (10) for a wheel suspension of a motor vehicle, comprising a handlebar base (18) with a wheel carrier side bearing (16) and with a front and rear body side bearing (12, 14) viewed in the vehicle longitudinal direction (x direction). The invention is characterized in that the handlebar base (18) is designed and / or dimensioned such that the handlebar base (18) has a greater rigidity in the vehicle transverse direction (y-direction) than in the vehicle longitudinal direction (x-direction).

Description

The invention relates to a wishbone for a suspension of a motor vehicle according to the specified in the preamble of claim 1. Art.

Wishbone with two body-side bearings are well known in the art. Only by way of example is on the DE 43 30 103 A1 and the DE 20 2015 103 767 U1 directed.

In general, a suspension of a motor vehicle in the vehicle longitudinal direction, hereinafter also referred to as x-direction, soft and in the vehicle transverse direction, hereinafter also referred to as y-direction to be stiff. This requirement, in particular the desired "longitudinal softness" in the vehicle longitudinal direction, is predominantly taken into account by a corresponding design of the body-side bearing of the handlebar of the suspension.

With reference to a wheel suspension comprising a control arm with two body-side bearings, this means that the "longitudinal softness" of the control arm is adjusted by a corresponding design of the radial and / or axial stiffness of the two body-side bearings.

This may, as set out below, depending on the structural design of the control arm, i. the front body-side bearing is located in front of the wheel center (=> first embodiment) or the rear body-side bearing is located behind the wheel center (=> second embodiment) or both bearings are beabered approximately equal from the wheel center arranged (=> third embodiment However, in the first embodiment of the wishbone due to the exposed position of the front bearing, the necessary rigid bearing connection of the front body-side bearing is possible only with increased weight and leads to a restriction of the steering angle, the second embodiment of the wishbone proves with a lying behind the wheel center body side bearing for package reasons disadvantageous because the space lying behind the Radmitte space for other components is no longer available. The third embodiment has the effect that - since both camps contribute to the longitudinal softness of the link - the two bearings are relatively soft in the radial direction, with the result that the axis has a limited transverse rigidity.

The invention is based on the object, a wishbone for a suspension of a motor vehicle according to the type specified in the preamble of claim 1 such that with respect to the criteria shell, package, maximum steering angle and Achsquersteifigkeit an optimized arrangement is possible.

This object is achieved by the characterizing features of claim 1 in conjunction with its generic features.

The dependent claims represent advantageous developments of the invention.

In a known manner, the control arm for a wheel suspension of a motor vehicle comprises a front and a rear body-side pivot bearing viewed in the vehicle longitudinal direction (x direction), the two body-side bearings defining a pivot about which the control arm is pivotable with respect to the vehicle body ,

Furthermore, the wishbone comprises in a known manner at least one of the pivot axis in the vehicle transverse direction (y-direction) spaced wheel carrier connection point and a between the two body-side bearings and the wheel carrier connection point extending handlebar base.

According to the invention, the handlebar base is designed and / or dimensioned such that the handlebar base in the vehicle transverse direction (y-direction) is significantly stiffer than in the vehicle longitudinal direction (x-direction). That is, according to the invention, the desired "longitudinal softness" of the control arm is achieved by a corresponding design and / or dimensioning of the handlebar base.

The inventive embodiment of the wishbone has the positive effect that - since the "longitudinal softness" is now primarily represented by the wishbone and not as in the prior art on the design of the body-side bearings - the x-position of the two body-side bearings, i. the position of the bearing in the vehicle longitudinal direction relative to the wheel center, is relatively freely selectable, so that can now achieve optimal positions for shell, package and steering angle.

The handlebar base is preferably designed and / or dimensioned in such a way that with a vehicle longitudinal force of 1000N for the stiffness ratio long stiffness (=> stiffness in the x direction) to transverse rigidity (=> stiffness in the y direction) of the handlebar base applies: $$\frac{LänGssteifiGkeit}{QuersteifiGkeit}<0.3$$

Preferably, the body-side bearings are designed so that they each have a bearing stiffness of> 5000N in the radial direction. The preferably designed as a rubber-metal bearings stock can thus be performed as a common part, which is associated with corresponding costs and variance advantages.

Preferably, the handlebar base is formed and / or dimensioned such that the rigidity of the handlebar base in the vehicle transverse direction (y-direction) has a progressive characteristic. In particular, also various progressions of the longitudinal rigidity of the handlebar base can be implemented, e.g. also one in the direction of travel and one opposite to the direction of travel.

A further preferred embodiment provides that viewed in the vehicle longitudinal direction (x-direction), the handlebar base at the front, i. in the region of the front body-side bearing, another longitudinal stiffness (=> stiffness in the x-direction) than the rear, i. in the region of the rear body-side bearing. This advantageously allows for improved tuning, e.g. in a handlebar in the upper link level is to guarantee high braking stiffness, the handlebar base front stiff and soft for reasons of edge comfort back.

According to a first embodiment, the handlebar base has a substantially triangular basic shape in plan view, and the handlebar base is provided with a brace aligned in the vehicle transverse direction (y-direction) and rigidly connected to the handlebar base. In this case, the bracing is pressure-resistant in the vehicle transverse direction (y-direction) and flexible in the vehicle longitudinal direction (x-direction). In addition, at least one, the handlebar base in the vehicle vertical direction (z-direction) penetrating and in the outer contour of the handlebar base forming a gap material recess is introduced into the handlebar base. While the desired increased stiffness of the control arm in the vehicle transverse direction (y-direction) is ensured by in the vehicle transverse direction (y-direction) braced and torsionally rigid bracing is considered by the vehicle in the longitudinal direction (x-direction) flexurally soft brace in combination with in introduced the handlebar base, a gap in the outer contour forming material recess, the longitudinal softness of the control arm in the vehicle longitudinal direction (x-direction) realized. Preferably, the material recess is formed in the form of a circular hole with a neck-shaped extension, wherein the neck-shaped extension extends to the outer contour and thus forms the gap in the outer contour. About the number and size of the material recesses in a simple way, the longitudinal stiffness or softness is adjustable.

Preferably, the gap in the outer contour of the link is dimensioned so that exceeding a defined on the handlebar in the vehicle longitudinal direction (x-direction) defined tensile and / or compressive force causes closing of the gap in the outer contour of the handlebar base. In this way, in a simple manner, a progressive characteristic curve in the rigidity of the handlebar base in the x-direction, i. Vehicle longitudinal direction, ensured.

According to a further embodiment of the invention, the handlebar base in turn in the plan view of a substantially triangular basic shape and the handlebar base is aligned with a vehicle transverse direction (y-direction), firmly connected to the handlebar base, flexible in x-direction, in the y-direction provided pressure-resistant bracing. In contrast to the already explained embodiment, the handlebar base in the vehicle transverse direction (y-direction) considered an S-shaped outer contour and at least one of the S-shaped outer contour following, the handlebar base in the vehicle vertical direction (z-direction) penetrating material recess. In this embodiment, the bracing in turn ensures the increased stiffness of the control arm in the vehicle transverse direction (y-direction) while resulting from the force acting in the vehicle longitudinal direction resulting elongation (tensile force) or compression (compressive force) of the S-shaped, curvy outer contour , the longitudinal softness of the control arm in the vehicle longitudinal direction (x-direction) is ensured. Due to the geometry of the curved outer contour, the progressivity of the longitudinal stiffness of the wishbone can be adjusted. It can be any number of material recesses.

Preferably, the strut is cohesively, in particular by means of welding, connected to the handlebar base. Alternatively, the handlebar base and the brace can also be integrally formed of metal or of a fiber-reinforced plastic.

Preferably, the strut is in the form of a bar with a rectangular cross-section. Since the beam fulfills the function of a bending beam, which should be as flexible as possible in the vehicle longitudinal direction, the beam is arranged on the handlebar base as a raised cross-section. On the upstanding cross-section, other elements of the suspension, such as those shown in FIG. a damper or a stabilizer coupling, be arranged.

Via a corresponding positioning of the strut in the vehicle longitudinal direction (x-direction), ie strut is arranged centrally between the body-side bearings or strut is closer to the front or closer to the rear arranged on-body bearing, can also take influence on the lateral force steering of the axle.

A further embodiment of the invention provides that the handlebar base in plan view has a substantially trapezoidal basic shape and that in the handlebar base a handlebar base in the vehicle vertical direction (z-direction) penetrating, the outer contour of the handlebar base subsequent, four corner regions having material recess is introduced. Here, the material recess is dimensioned so that by kinky but pressure-stiff areas tend to be formed in the handlebar base, which allow under the action of a vehicle in the longitudinal direction (x-direction) tensile or compressive force an elastic buckling of the handlebar base in this area. That is, in this embodiment, the increased rigidity of the transverse link in the vehicle transverse direction (y-direction) is ensured by the closed, rectilinear outer contour of the handlebar base and the longitudinal compliance of the wishbone is ensured by the described kink soft areas of the handlebar base and a parallelogram-like elastic deformation.

To ensure a progressive characteristic curve of the stiffness of the control arm in the vehicle longitudinal direction is provided according to a preferred embodiment, that one or more of said corner regions in the vehicle longitudinal direction (x-direction) considered two aligned, comprising a gap webs, wherein the webs are dimensioned in that an exceeding of a defined tensile and / or compressive load acting on the handlebar in the vehicle longitudinal direction (x-direction) causes a closing of the gap defined by the two webs.

On the number, size and shape of the material recesses in the handlebar base, the desired longitudinal compliance of the wishbone can be set specifically. For example, the positioning of a material recess in the region of the wheel carrier connection point has the effect that the wheel carrier side bearing a higher delta offset in the vehicle transverse direction (y direction) learns with the result that hereby the toe angle change of the wheel at a longitudinal force, such as. when braking, can be specifically influenced.

Preferably, the handlebar base is formed of a fiber composite material. In addition to the low component weight, the formation of the handlebar base made of a fiber composite material has the advantage that influence can be exerted on the longitudinal stiffness and the progressiveness of the handlebar base to the described geometrical configurations also on an appropriate choice of material or fiber orientation.

It is also conceivable, in particular, that materials with a hysteresis are introduced into the handlebar base, i. Materials that react with a force acting on the wishbone in the vehicle longitudinal direction (x-direction) tensile or compressive force only after a certain soft way with increasing counterforce.

It is only pointed out for the sake of completeness that, in the context of the present invention, the handlebar base can of course also be designed as a metal component.

Preferably, the material recess (s) formed in the handlebar base is / are provided with an elastic material, e.g. Rubber or other plastic, filled or injected.

Further advantages and possible applications of the present invention will become apparent from the following description in conjunction with the embodiments illustrated in the figures.

• 1 eine schematische Darstellung einer ersten Ausführungsform eines erfindungsgemäßen Querlenkers für eine Radaufhängung eines Kraftfahrzeugs;
• 2 eine zweite Ausführungsform eines erfindungsgemäßen Querlenkers in schematischer Draufsicht, und
• 3 eine Draufsicht auf eine dritte Ausführungsform eines erfindungsgemäßen Querlenkers in einer schematischen Ansicht.

In the figures:

• 1 a schematic representation of a first embodiment of a control arm according to the invention for a suspension of a motor vehicle;
• 2 a second embodiment of a control arm according to the invention in a schematic plan view, and
• 3 a plan view of a third embodiment of a control arm according to the invention in a schematic view.

In the following description and in the figures, to avoid repetition, the same components and components are identified by the same reference numerals, unless further differentiation is necessary or expedient.

1 to 3 show a total with reference numeral 10 designated wishbone for a suspension of a motor vehicle. The vehicle longitudinal direction is designated by x, the vehicle transverse direction by y and, correspondingly, z is the vehicle vertical direction.

According to the in 1 illustrated embodiment is the handlebar 10 designed as a wishbone and includes a view in the vehicle longitudinal direction x front body-side bearing 12 , a rear body-side bearing 14, a Radträgerseitige bearing point 16 and a between the body-side bearings 12 . 14 and the wheel carrier bearing 16 extending handlebar base 18 ,

The two constructed as a rubber-metal bearings body-side bearing 12 . 14 In the present case, these are designed as identical parts and, viewed in the radial bearing direction, have a greater bearing stiffness than in the axial bearing direction.

As 1 further shows, comprises the handlebar base 18 of the control arm 10 a in vehicle transverse direction y extending strut 20 , The strut 20 is present at its axial ends fixed to the handlebar base 18 of the control arm 10 welded. The bracing 20 is in the vehicle transverse direction y pressure-rigid and bendable in the vehicle longitudinal direction x. This will ensure that by the bracing 20 in the vehicle transverse direction y a high rigidity of the control arm 10 is ensured while viewed in the vehicle longitudinal direction x due to the flexible design of the strut 20 , the bracing 20 has a lesser influence on the longitudinal stiffness of the control arm 10 considered in the vehicle longitudinal direction x.

To realize the desired longitudinal softness of the wishbone 10 viewed in the vehicle longitudinal direction x, comprises the handlebar base 18 the wishbone 10 also two, the handlebar base 18 in the vehicle vertical direction z penetrating material recesses 22 , The material recesses 22 are each formed in the form of a circular hole with a neck-shaped extension, wherein the neck-shaped extension of the two material recesses 20 each up to the outer contour 24 of the control arm 10 extends and in the outer contour 24 of the control arm 10 a gap 26 form. The gap width is denoted by b below.

The gap width b is dimensioned such that when exceeding a defined in the vehicle longitudinal direction x on the wishbone10 attacking tensile or compressive force, the gap 26 closes, allowing a progressive stiffness curve of the handlebar base 18 and thus the wishbone 10 is ensured in the vehicle longitudinal direction x. The different material recesses 22 can have different gap widths b. Depending on the desired stiffness curve, more or fewer material recesses can be used 22 be provided.

The measures described, namely bracing 20 and material recesses 22, have the effect of the handlebar base 18 and thus the wishbone 10 in the vehicle transverse direction y has a significantly greater rigidity than in the vehicle longitudinal direction x.

Now, according to the invention, the longitudinal softness over the handlebar base 18 of the control arm 10 Realized is the location of the body-side bearings 12 . 14 be chosen relatively freely, so that now optimal positions for shell, package and steering angle can be achieved.

Also at the in 2 illustrated embodiment is the wishbone 10 again designed as a wishbone. In addition - in accordance with in 1 shown embodiment - on the handlebar base 18 a strut 20 welded, which is formed accordingly and by means of the required rigidity of the handlebar base 18 and thus the wishbone 10 is ensured in the vehicle transverse direction y.

Unlike the in 1 illustrated embodiment, the outer contour 24 of the handlebar base 18 in the vehicle transverse direction y views an S-shaped course. In addition, the handlebar base points 18 two in relation to the bracing 20 opposite, the handlebar base 18 in the vehicle vertical direction z penetrating, the S-shaped outer contour substantially following material recesses 22 on.

While as under 1 already explained, in the vehicle transverse direction y by the strut a high rigidity of the handlebar base 18 and thus the wishbone 10 is ensured at the in 2 embodiment shown by the described S-shaped, curvy design of the outer contour 24 and thus made possible elongation or compression under the action of a vehicle longitudinal direction x directed force, the longitudinal softness of the control arm 10 ensured in the vehicle longitudinal direction x.

According to the in 3 embodiment shown, the wishbone 10 in plan view, a substantially trapezoidal basic shape. In addition, in the handlebar base 18 of the control arm 10 a relatively large, the trapezoidal outer contour 24 essentially subsequent material recess 22 introduced. The material recess 22 that the handlebar base 18 in the vehicle vertical direction z in turn completely penetrates, is dimensioned so that through the corner regions 28 the material recess 22 tends to kinky but pressure-resistant areas in the handlebar base 18 are formed, which allow a defined elastic buckling of the handlebar base 18 in this area when acting in the vehicle longitudinal direction x tensile or compressive force.

To ensure a progressive stiffness curve of the handlebar base 18 and thus the wishbone 10 in vehicle longitudinal direction x are also - like 3 further shows - in a corner area 28 two substantially in the vehicle longitudinal direction x aligned one another, a gap 26 forming webs 30 arranged. The bridges 30 are designed so that a crossing on the wishbone 10 in the vehicle longitudinal direction x attacking, defined tensile and / or compressive load closing the by the two webs 30 defined gap 26 causes.

Thus, at the in 3 illustrated embodiment by the measures described, namely on the one hand by the viewed in the vehicle transverse direction y, closed and rectilinear outer contour and on the other hand by the kink soft corners 28 ensures that the wishbone 10 has a significantly greater rigidity in the vehicle transverse direction y than in the vehicle longitudinal direction x.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4330103 A1 [0002]
• DE 202015103767 U1 [0002]

Claims (12)

A control arm (10) for a wheel suspension of a motor vehicle, comprising a handlebar base (18) with at least one wheel carrier side bearing (16) and with a vehicle in the longitudinal direction (x-direction) considered front and rear-side bearing (12, 14), characterized in that the handlebar base (18) is designed and / or dimensioned such that the handlebar base (18) has a greater rigidity in the vehicle transverse direction (y-direction) than in the vehicle longitudinal direction (x-direction). Wishbone (10) for a motor vehicle after Claim 1 , characterized in that the handlebar base (18) is formed and / or dimensioned such that the handlebar base (18) has a rigidity ratio of: $$\frac{SteifiGkeitinFaHrzeuGlänGsricHtunG\left(x-RicHtunG\right)}{SteifiGkeitinFaHrzeuGlänGsricHtunG\left(y-RicHtunG\right)}<0.3$$

having. Wishbone (10) for a motor vehicle after Claim 1 or 2 , characterized in that the front and the rear body side bearing (12, 14) have a bearing stiffness of> 5000 N / mm. Wishbone (10) for a motor vehicle according to one of Claims 1 to 3 , characterized in that the handlebar base (18) is formed and / or dimensioned such that the rigidity of the handlebar base (18) in the vehicle longitudinal direction (x-direction) is progressive. Wishbone (10) for a motor vehicle according to one of the preceding claims, characterized in that the handlebar base (18) in the region of the front body-side bearing (12) and in the region of the rear body-side bearing (14) in the vehicle longitudinal direction (x-direction) considered differently is stiff. Wishbone (10) according to one of Claims 1 to 5 , characterized in that the handlebar base (18) in the vehicle transverse direction (y-direction) aligned with the handlebar base (18) fixedly connected strut (20), and in that the handlebar base (18) at least one, the handlebar base (18) in the vehicle vertical direction (z-direction) penetrating and in the outer contour (24) of the handlebar base (18) a gap (26) forming material recess (22) is introduced. Wishbone (10) to Claim 6 , characterized in that the gap (26) in the outer contour (24) of the handlebar base (18) is dimensioned such that an exceeding on the handlebar (10) in the vehicle longitudinal direction (x-direction) attacking, defined tensile and / or compressive force causing closing of the gap (26) in the outer contour (24) of the handlebar base (18). Wishbone (10) according to one of Claims 1 to 5 , characterized in that the handlebar base (18) in the vehicle transverse direction (y-direction) has an S-shaped outer contour (24), and that the handlebar base (18) aligned in the vehicle transverse direction (y-direction), with the handlebar base (18) firmly connected strut (20) and at least one, the S-shaped outer contour (24) following, the handlebar base (18) in the vehicle vertical direction (z-direction) penetrating material recess (22). Wishbone (10) according to one of Claims 1 to 5 , characterized in that the handlebar base (18) has a trapezoidal basic shape and in that in the handlebar base (18) a handlebar base (18) in the vehicle vertical direction (z-direction) penetrating, the outer contour (24) of the handlebar base (18) following, four Corner regions (28) having material recess (22) is introduced. Wishbone (10) to Claim 9 , characterized in that at least one corner region (28) comprises two in the vehicle longitudinal direction (x-direction) viewed aligned, a gap (26) forming webs (30), wherein the webs (30) are dimensioned so that an exceeding of a Handlebar (10) in the vehicle longitudinal direction (x-direction) attacking, defined tensile and / or compressive force causes a closing of the two webs (30) defined gap (26). Wishbone (10) according to one of the preceding claims, characterized in that the Materialaussparung / s (22) is filled with an elastic material / are. Wishbone (10) for a motor vehicle according to one of the preceding claims, characterized in that the handlebar base (18) is formed from a fiber composite material.

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