DE102008062901A1 - Composite guide rear axle for motor vehicle rear carriage, has trailing arm coupled with front end portion of vehicle structure, where cross bar of trailing arm is connected with each other in area of wheel carrier - Google Patents

Abstract

The composite guide rear axle (1) has two trailing arms (2), where each trailing arm is coupled with a front end portion of a vehicle structure. A cross bar (5) of a trailing arm is connected with each other in an area of a wheel carrier (4). The trailing arms have an opened and torsionally smooth profile cross section for providing a lateral force support on the trailing arms. An independent claim is also included for a motor vehicle rear carriage.

Description

The The invention relates to a torsion beam rear axle for a motor vehicle comprising two trailing arms and a bend-stiff, but torsionally soft cross member. The trailing arm are each with a front end portion to a vehicle body can be coupled and have a wheel carrier at a rear end section on.

In Vehicle construction come as semi-rigid rear axles especially composite beam axles and Torsionskurbelachsen used.

In the case of beam steering axles, such as for example DE 195 42 522 A1 and DE 198 40 134 A1 are known, the cross member connecting the trailing arm in the front half of the axis in the direction of travel. The trailing arms are designed here as torsion and bending resistant components. A mutual compression and rebound of the vehicle wheels is made possible by the torsional capability of the cross member. A lateral force support takes place solely on the trailing arm.

In Torsionskurbelachsen the trailing arm are bending stiff only around the vehicle transverse direction, so that an additional lateral force support, for example in the form of a Panhardstabs is required. This requires additional space. At one of the DE 10 2006 018 641 A1 known rear axle of Panhardstab is arranged behind the cross member, which in turn is located near the wheel axle. At one of the EP 0 458 665 B1 known rear axle of Panhardstab attacks on a trailing arm and extends diagonally through the space between the trailing arms.

The The invention aims to further develop the concept of the torsion beam axle. In particular, a cheap and lightweight torsion beam rear axle be created with good comfort and good driving dynamics.

moreover the torsion beam rear axle is the space requirements of a more complex four-link rear suspension suffice, so that in a vehicle series the torsion beam rear axle as a simpler Exchange variant is available.

These Task is by a torsion beam rear axle according to claim 1 solved. The torsion beam rear axle according to the invention includes two trailing arms, each with a front Endabschnitt can be coupled to a vehicle body and on a rear end portion have a wheel, as well as a flexible but torsionally soft cross member. she is characterized in that the cross member, the trailing arm in the area of the wheel carrier connects to each other and the trailing arm an open, rigid, but torsionally soft profile cross-section have, so that a side force support over the trailing arm takes place.

hereby a cheap and lightweight rear axle is created, the one good ride comfort and good driving dynamics and in the space a more elaborate four-link rear axle fits.

The additional bracing required for torsion crank axles, which the design scope for surrounding components how to restrict a fuel tank or the exhaust system, is not needed in the present case, as in the inventive Twist-beam rear axle, the lateral forces alone on the trailing arms are supported.

The Twist-beam rear axle according to the invention allows in particular a short vehicle undercarriage, in which the cross member the torsion beam rear axle between a fuel tank and a silencer of the exhaust system is arranged.

Especially The fuel tank may extend into the space between the trailing links extend.

advantageous Embodiments of the invention are in further claims specified.

So can in an advantageous embodiment of the cross member and the wheel axle of the rear wheels in a common vertical plane lie. However, there is also a certain shift in the vehicle longitudinal direction possible. Preferably closes a plane through spanned the central axis of the cross member and the wheel axle is, with a running through the central axis of the cross member Vertical plane an angle of maximum 30 °. The crossbeam runs preferably below the wheel axle.

For the profile cross section of the trailing arm come all cross-sectional shapes considering both the vehicle transverse direction and the vehicle vertical direction a significantly higher flexural rigidity as having about the longitudinal axis of the handlebar.

In a preferred embodiment, the trailing arm a substantially U-shaped profile cross section. Optionally, the U-profile by additional bracing be stiffened. This cross-sectional shape allows a simple production and lying down a relatively easy adaptation of the bending and torsion properties to the respective Axis configuration.

The Side length of the profile cross-section can be in the vehicle transverse direction towards the wheel carriers increase, so that in the area of the cross member or the wheel carrier a wide Connection basis results.

According to one further advantageous embodiment, the trailing arm towards the wheel carriers towards an increasing width and are formed stiffer at the axle center facing side than at the Wheel side. As a result, under lateral force a minor Deformation in the toe-in direction causes.

The Wheel carriers can either be integral with the trailing arms be educated. However, it is also possible the wheel carrier form as separate components, which are attached to end portions of the trailing arm are. Preferably, the cross member to the wheel carrier connected.

In an advantageous embodiment lead the wheel the cross member in the direction of the vehicle wheels away.

Farther The wheel carriers can be multi-piece with one each Upper shell and a lower shell are executed. hereby Can be a stable recording for the cross member to be provided. The upper and lower shell are preferably welded together. You can, however each only with the cross member, but not welded together be.

At the wheel carrier can also each formed a spring plate be, whereby the effort in assembling the axle reduced becomes. In addition, a stable connection of the spring plate to the rest Structure preserved.

Recordings for vibration are preferred to the Wheel carriers attached.

Preferably are related to the spring plate and / or the damper mount on the vehicle longitudinal direction behind the cross member arranged.

According to one Further advantageous embodiment, the wheel carrier each have a partition plate, which is in the profile cross-section extends the cross member and connected there to the cross member is. This results in an abrupt transition between stiffness the cross member and the trailing arms or wheel carriers avoided and improves the component strength.

Farther can be a rod-shaped at the torsion beam rear axle Stabilizer be provided, which connects the trailing arm. The stabilizer can within the profile cross section of the cross member or arranged in front of the cross member in the vehicle longitudinal direction be. As a result, if necessary, the torsional resistance the axle at a mutual compression and rebound of the vehicle wheels increase.

following the invention will be described with reference to embodiments shown in the drawings explained in more detail. The drawing shows in:

1 a spatial view of a first embodiment of a torsion beam rear axle according to the invention,

2 a spatial view of a second embodiment of a torsion beam rear axle according to the invention,

3 different profile cross-section variants for the trailing arms along the cutting lines II in 1 and II-II in 2 .

4 1 is a schematic representation of the side-force induced toe-in effect in a view from above of the installation position in the vehicle,

5 a spatial view of a third embodiment of a torsion beam rear axle according to the invention obliquely from the top front

6 a further spatial view of the third embodiment of obliquely behind the bottom, and in

7 an example of installation in a short vehicle towing vehicle.

This in 1 illustrated first embodiment shows a torsion beam rear axle 1 for a motor vehicle, are guided over the vehicle rear wheels and supported on a vehicle body.

The torsion beam axle 1 has two trailing arms extending substantially in the vehicle longitudinal direction 2 on. Each trailing arm 2 has a bearing receptacle on a front end in the direction of travel 3 for a rubber-metal bearing for articulated coupling to the vehicle body. The torsion beam rear axle is accordingly pivotable about a horizontal, extending in the vehicle transverse direction axis. Further, at the rear ends of the trailing arm 2 one wheel carrier each 4 intended for storage of a vehicle wheel. The wheel carriers 4 are here as special to the trailing arms 2 shown attached components. However, it is also possible, the trailing arm 2 with the wheel carriers 4 to produce in one piece.

The torsion beam axle 1 also has a flex-stiff, but torsionally soft cross member 5 on top of the side members 2 connects with each other. In the illustrated embodiment, the cross member has 5 a in the installed position downwardly open profile cross section, which may for example be substantially U- or V-shaped.

As 1 shows is the cross member 5 in contrast to conventional torsion beam rear axles offset in the vehicle longitudinal direction to the rear, so that this trailing arm 2 in the field of wheel carriers 4 connects with each other. The wheel carriers 4 each form an extension of the cross member 5 in the vehicle transverse direction, wherein the cross member 5 is slightly below the wheel axle A. A through the wheel axis A extending vertical plane intersects the cross member 5 , Preferably, the cross member 5 with respect to the wheel axle A arranged such that a central axis B of the cross member 5 spans a plane with the wheel axle A of the rear wheels, with a through the central axis B of the cross member 5 extending vertical plane includes a maximum angle of 30 °. The rear ends of the trailing arm 2 are here at the wheel carriers 4 and / or the cross member 5 welded.

Furthermore, the trailing arm 2 an open rigid profile cross-section, however, is torsionally soft in contrast to conventional torsion beam rear axles. A lateral force support takes place solely on the trailing arm 2 ,

According to the embodiment 1 is the profile cross section of the trailing arm 2 is substantially U-shaped, wherein the profile is arranged horizontally, so that the opening of the U-profile faces the wheel side. The U-profile is here by a vertically arranged stiffening plate 6 additionally reinforced.

The width of the thighs 7 of the U-shaped profile cross-section increases in the vehicle transverse direction to the wheel carriers 4 towards. It thus results to the wheel carriers 4 towards an increasing profile width. One the thighs 7 connecting bridge 8th of the U-profile is arranged on the axle center facing side, so that the trailing arm 2 are stiffer at the axle center side than at the wheel side. This allows a slight deformation of the torsion beam rear axle under the action of a lateral force F. 1 like this in 4 is shown. This deformation causes a desired toe-in effect, but otherwise does not affect in any way the lateral force support on the trailing arm 2 ,

Further examples of possible cross-sectional shapes are in 3 shown. In particular, the trailing arm 2 also be executed clamshell.

The torsional behavior of the torsion beam rear axle 1 in mutual compression and rebound of the vehicle wheels is substantially by the cross-sectional shape of the trailing arm 2 and the cross member 5 affected. Optionally, to increase the torsional resistance, a rod-shaped stabilizer 9 between the trailing arms 2 be coupled. At the in 1 illustrated embodiment extends a tubular stabilizer 9 within the profile cross section of the cross member 5 , wherein the stabilizer ends 9a at the wheel carriers 4 are fixed.

In a modification of the first embodiment, the stabilizer 9 in the vehicle longitudinal direction in front of the cross member 5 be arranged like this in 2 is shown. The stabilizer 9 is here directly to the trailing arm 2 connected. As a result, toe and lateral stiffness are further improved.

To support the vehicle body, the torsion beam rear axle 1 still two spring plates 10 for two coil springs, which are relative to the vehicle longitudinal direction behind the cross member 5 are arranged. The spring plates 10 are either specific to the trailing arms 2 and / or the wheel carriers 4 and / or the cross member 5 attached, but can also be formed directly on one of these components.

Furthermore, at the torsion beam rear axle 1 two shots 11 each provided for a vibration damper. These shots 11 are preferably above or behind the cross member 5 and can be attached to the trailing arms 2 and / or the wheel carriers 4 and / or the cross member 5 attached, for example, be welded. However, it is also possible to take the pictures 11 to mold to the aforementioned components.

A third embodiment of a torsion beam rear axle 1' is in the 5 and 6 shown. This in turn has two rigid, but torsionally trailing trailing arm 2 ' and a torsionally soft cross member 5 ' on. A lateral force support takes place solely on the trailing arm 2 ' ,

Each trailing arm 2 has a bearing receptacle on a front end in the direction of travel 3 ' for a bearing for coupling to a vehicle body so that the torsion beam rear axle 1' about a horizontal, extending in the vehicle transverse direction axis is pivotable. At the rear ends of the trailing arm 2 ' is each a wheel carrier 4 ' attached to the storage of a vehicle wheel, preferably welded.

The crossbeam 5 ' which has a profile cross-section which is open in the installed position and which can be substantially U-shaped or V-shaped, for example, connects the wheel carriers 4 ' for the cross member 5 ' each form a recording. The Rear ends of the trailing arm 2 ' are in the range of these shots on the wheel carriers 4 ' attached.

The wheel carriers 4 ' each have an upper shell 4a ' and a lower shell 4b ' on which one end section 5a ' of the crossbeam 5 ' embrace and are interconnected. At the lower shell 4b ' is a bulkhead 4c ' molded, located in the profile cross section of the cross member 5 ' extends. In the illustrated embodiment, the partition plates extend 4c ' each in the profile cross sections of the end sections 5a ' of the crossbeam 5 ' , However, sections of the bulkhead plates may 4c ' also something from the profile of the cross member 5 ' protrude. Per end section 5a ' is a bulkhead 4c ' on the cross member 5 ' attached to each other or to the center of the axle facing ends of the partition plates 4c ' spaced apart from each other. The desired torsion of the crossbeam 5 ' takes place essentially in the section between the bulkhead plates 4c ' instead of. The bulkhead plates 4c ' can become a crossbeam 5 ' be obliquely employed, which in each case starting from the wheel-side end in the direction of the axle centering end deeper into the profile cross-section of the cross member 5 ' penetration.

Also in the third embodiment, the cross member 5 ' offset so far back that this is the trailing arm 2 ' in the field of wheel carriers 4 ' connects to each other, with the cross member 5 ' is slightly below the wheel axle A. Preferably, the cross member 5 ' with respect to the wheel axle A arranged such that a central axis B of the cross member 5 ' spans a plane with the wheel axle A of the rear wheels, with a through the central axis B of the cross member 5 extending vertical plane includes a maximum angle of 30 °. In 5 and 6 both levels coincide.

A rigid, but torsionally soft construction of the trailing arm 2 ' is obtained by a triangular in the direction of view from above design with U-shaped profile cross-section, the profile opening facing the wheel side. The U-shaped profile cross section comprises two substantially triangular horizontal legs 7 ' , which at their middle-pointing side by a vertical web 8th' are connected. The trailing arm 2 ' is with a triangle base on the wheel carrier 4 ' or cross member 5 ' attached, while the triangle base the opposite tip direction bearing 3 ' has. The latter is at an end portion of the vertical web 8th' formed in the form of a passage opening. The trailing arm 2 ' is thus stiffer on its side facing the center of the axle than on the wheel side. Under the influence of a lateral force F thus results in in 4 indicated slight deformation to effect a toe-in effect.

The torsion beam rear axle 1 of the third embodiment further comprises two spring plates 10 ' for two vehicle springs 12 ' on, over which the vehicle body is supported on the rear axle. The spring plates 10 ' are in turn behind the cross member 5 are arranged and attached to the wheel carrier 4 ' formed. In particular, both to the upper shell 4a ' as well as to the lower shell 4b ' formed a corresponding projection. Both projections overlap each other and allow a particularly rigid inclusion of the spring plate 10 ' in the forest. However, it is also possible to use separate spring plates on the wheel carriers 4 ' and / or the trailing arms 2 ' and / or the cross member 5 ' to fix.

Furthermore, on the torsion beam rear axle 1' two shots 11 ' for each a vibration damper 13 ' intended. These shots 11 are here below the wheel center behind the cross member 5 ' arranged and on the wheel carriers 4 ' attached, for example, welded. However, a connection of the shock absorber 13 ' if necessary also be done elsewhere. In addition, sections of the shots 11 ' also to the wheel carriers 4 ' or other components of the torsion beam rear axle 1' like the crossbeam 5 ' or the trailing arm 2 ' be formed.

7 shows the installation position of the torsion beam rear axle 1' according to the third embodiment of a vehicle undercarriage. The basis of the 1 and 2 explained embodiments can be installed in the same manner.

The front end portions of the trailing arm 2 ' are about rubber-metal bearings in body-mounted brackets 14 added. In between the trailing arms 2 ' formed space in front of the cross member 5 ' extends a fuel tank 15 , In the direction of travel behind the cross member 5 ' is an end pot 16 arranged an exhaust system. The final pot 16 is under a trunk floor. The torsion beam rear axle 1' thus fits into the space of a four-link rear suspension, without requiring modifications to the fuel tank 15 or at the exhaust system would have to be made. Both axes can thus be installed optionally.

The The invention has been described above with reference to an embodiment explained in more detail. But she is not on it but all encompasses the claims defined embodiments.

1, 1'

Beam axle

2, 2 '

Trailing arm

3, 3 '

bearing seat

4, 4 '

wheel carrier

4a '

Upper shell

4b '

subshell

4c '

Schott sheet

5, 5 '

crossbeam

5a '

end

6

gusset

7, 7 '

leg

8th, 8th'

web

9

stabilizer

9a

stabilizer end

10 10 '

spring plate

11 11 '

admission

12

vehicle spring

13 '

vibration

14

console

15

Fuel tank

16

silencer

A

wheel axle

B

central axis of the crossbeam

F

lateral force

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19542522 A1 [0003]
• - DE 19840134 A1 [0003]
• DE 102006018641 A1 [0004]
• EP 0458665 B1 [0004]

Claims (18)

Twist-beam rear axle, comprising: two trailing arms ( 2 ; 2 ' ), which are each coupled or coupled with a front end portion to a vehicle body and at a rear end portion a wheel carrier ( 4 ; 4 ' ), and a flexurally stiff, but torsionally soft cross member ( 5 ; 5 ' ), characterized in that the cross member ( 5 ; 5 ' ) the trailing arms ( 2 ; 2 ' ) in the region of the wheel carrier, and the trailing arm ( 2 ; 2 ' ) have an open rigid, but torsionally soft profile cross section, such that a lateral force support via the trailing arm ( 2 ; 2 ' ) he follows. Twist-beam rear axle according to claim 1, characterized in that the cross member ( 5 ; 5 ' ) and the wheel axle (A) of the rear wheels lie in a common vertical plane. Twist-beam rear axle according to claim 1, characterized in that a central axis (B) of the cross member ( 5 ; 5 ' ) with the wheel axle (A) of the rear wheels spans a plane which, with a through the central axis (B) of the cross member ( 5 ; 5 ' ) extending vertical plane includes an angle of 30 ° maximum. Twist-beam rear axle according to one of claims 1 to 3, characterized in that the trailing arm ( 2 ; 2 ' ) have a substantially U-shaped profile cross-section. Twist-beam rear axle according to claim 4, characterized in that the leg width of the U-shaped profile cross-section in the vehicle transverse direction to the wheel carriers ( 4 ; 4 ' ) increases. Twist-beam rear axle according to one of claims 1 to 5, characterized in that the trailing arm ( 2 ; 2 ' ) to the wheel carriers ( 4 ; 4 ' ) have an increasing width and are stiffer at a side facing the center of the axle than at one side of the wheel. Twist-beam rear axle according to one of claims 1 to 6, characterized in that the wheel carrier ( 4 ; 4 ' ) as at end portions of the trailing arm ( 2 ; 2 ' ) fastened components are formed and the cross member ( 5 ; 5 ' ) to the wheel carrier ( 4 ; 4 ' ) connected. Twist-beam rear axle according to one of claims 1 to 7, characterized in that the wheel carrier ( 4 ; 4 ' ) the cross member ( 5 ; 5 ' ) continue in the direction of the vehicle wheels. Twist-beam rear axle according to one of claims 1 to 8, characterized in that the wheel carrier ( 4 ' ) one upper shell each ( 4a ' ) and a lower shell ( 4b ' ) exhibit. Twist-beam rear axle according to one of claims 1 to 9, characterized in that on the wheel carrier ( 4 ; 4 ' ) each a spring plate ( 10 ; 10 ' ) is formed. Twist-beam rear axle according to one of claims 1 to 10, characterized in that on the wheel carriers ( 4 ; 4 ' ) one recording each ( 11 ; 11 ' ) is attached to a vibration damper. Twist-beam rear axle according to one of claims 1 to 11, characterized in that the spring plate ( 10 ; 10 ' ) and / or the damper mount ( 11 ; 11 ' ) relative to the vehicle longitudinal direction behind the cross member ( 5 ; 5 ' ) are arranged. Twist-beam rear axle according to one of claims 1 to 12, characterized in that the wheel carrier ( 4 ' ) in each case a partition plate ( 4c ' ), in the profile cross-section of the cross member ( 5 ' ) and there with the cross member ( 5 ' ) connected is. Twist-beam rear axle according to one of claims 1 to 13, characterized in that a rod-shaped stabilizer ( 8th ) the trailing arms ( 2 ; 2 ' ) connects. Twist-beam rear axle according to claim 14, characterized in that the stabilizer ( 8th ) within the profile cross section of the cross member ( 5 ) is arranged. Twist-beam rear axle according to claim 14, characterized in that the stabilizer ( 8th ) in the vehicle longitudinal direction in front of the cross member ( 5 ) is arranged. A vehicle towing vehicle comprising: a torsion beam rear axle ( 1 ; 1' ) according to one of the preceding claims, a fuel tank ( 15 ), and an end pot ( 16 ) of an exhaust system, characterized in that the cross member ( 5 ; 5 ' ) of the torsion beam rear axle ( 1 ; 1' ) between the fuel tank ( 15 ) and the final pot ( 16 ) of the exhaust system is arranged. Twist-beam rear axle according to claim 17, characterized in that the fuel tank ( 15 ) into the space between the trailing arms ( 2 ; 2 ' ).