DE102006026961A1 - Composite pivot pin for motor vehicle, comprises front ends of longitudinal guide are connected firmly with axle body, and wheel is positioned at rear ends of longitudinal guide - Google Patents

Abstract

The composite pivot pin (10) comprises internal ends (22b,24b) supporting control arms (22,24) at an automotive body around jacking point, which is rotary mounted on coupling guide (26). The front ends (14a,16a) of longitudinal guide (14,16) are connected firmly with axle body (12), and a wheel (18,20) is positioned at rear ends (14b,16b) of longitudinal guide. The wheel comprises two traverse control arms directed towards lateral direction, where wheel side arranged outer ends (22a,24a) are positioned at longitudinal guides and wheel inner ends are positioned at a vehicle body (30).

Description

The The invention relates to a torsion beam axle for a motor vehicle according to the Preamble of claim 1 specified type.

In general, axles show a composite effect if, in one-sided springs, the other wheel is not unaffected or if the parallel and the mutual suspension states differ. The torsion beam axle in the strict sense, which today represents the usual rear axle for front-wheel drive cars, usually consists of two rigid and torsionally rigid longitudinal arms that carry the wheels and a torsionally cross profile that connects the two longitudinal arms. Such a well-known twist beam axle is for example in the DE 195 35 521 A1 disclosed. A well-known disadvantage of twist beam axles is the elastokinematic oversteer tendency with longitudinal and lateral forces.

A generic torsion axis is from the DE 103 57 885 A1 known. The torsion axis comprises two trailing arms, which are connected to each other via a transverse to the trailing arms extending torsion and are mounted with their front ends in main bearings schwenkbe movable with respect to a vehicle body. The torsion axis is characterized by the fact that side arms receiving lateral forces are coupled to the rear ends of the trailing arms in the direction of travel. A disadvantage proves in the present construction, the fact that due to the rigid mounting of the control arms during compression / rebound constraining forces are applied to the torsion, which causes a negative impact on the fatigue strength of the torsion.

Of the Invention is based on the object, a torsion beam axle for a motor vehicle according to the Preamble of claim 1 specified type while avoiding the mentioned disadvantages such that the torsion beam axle improved Dynamic driving characteristics and improved comfort properties having.

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

The under claims form advantageous developments of the invention.

Of the Invention is based on the finding that in a torsion beam axle with wishbones, the bearing of the wishbone on the vehicle body the properties The torsion beam axis during rebound / rebound decisively influence.

For this includes the torsion beam axle for a Motor vehicle aligned in the vehicle transverse direction, rigid and torsionally soft axle body and two in the vehicle longitudinal direction aligned, bending and torsionally stiff trailing arm, whose viewed in the vehicle longitudinal direction Front ends firmly connected to the axle body are and at the rear ends in each case a wheel is mounted. moreover The composite beam axis comprises two aligned in the vehicle transverse direction Wishbone whose each wheel-side aligned outer ends at the trailing arms and the inner ends are mounted on a vehicle body. According to the invention Inner ends of the wishbone on one of the vehicle body to a Bearing point rotatably mounted Koppellenker stored. By the storage according to the invention The inner ends of the wishbone is now on compression / rebound the wheels of the motor vehicle only a guided in the vertical direction compensating movement the wishbone allows i.e. that the coupling link by the one or rebound movement conditional transverse movement of the inner ends of the wishbone compensates. The consequence of this is a reduction in compression and rebound the axle body acting compulsive forces. Due to the now lower acting on the axle body forces this can be advantageously dimensioned smaller, thereby Cost and weight can be saved.

Advantageously, the storage of the outer ends of the wishbone on the trailing arms, the storage of the inner ends of the wishbone on the coupling link, and the storage of the coupling link on the vehicle body ( 28 ) are each formed such that the bearings each have a high radial stiffness and a low torsional stiffness. As a result, an exact lateral guidance of the axle and a high level of comfort is ensured due to the low secondary spring rate.

Preferably is the bearing point of the coupling link on the vehicle body in the vehicle longitudinal direction considered behind the wheel center and viewed in the vehicle transverse direction on an imaginary vehicle longitudinal center axis arranged. The provision of the control arms and the special arrangement The wishbone has the effect of understeering steering behavior the torsion beam axle is secured under lateral force.

According to one embodiment of the invention, the bearing point of the coupling link is viewed in the vertical direction between the inner ends of the control arms and arranged laterally offset to an imaginary connecting line between the inner ends of the control arms. In a simple manner, therefore, a bearing of the control arm is provided, in which the compression / rebound the consequent transverse movement of the inner En the wishbone is compensated by a rotational movement of the coupling link.

According to one another embodiment the invention is the bearing point of the coupling link in vertical Direction considered between the inner ends of the wishbones and on an imaginary connecting line between the inner ends the wishbone arranged. This construction proves to be advantageous because this ensures a space-saving design of the coupler is.

In Advantageously, in both embodiments, the bearing point of the coupling link viewed in vertical direction above the axle body arranged.

Preferably the composite beam axle is pivotally movable by a first and second bearings mounted around a respective bearing axis of rotation on the vehicle body. These Twofold mounting of the torsion beam axle proves to be advantageous as a result prevents a move under unbalanced longitudinal forces becomes (e.g., μ-split braking). Furthermore increases thereby the scope in the camp vote.

In a particularly preferred embodiment the bearing axes of rotation of the first and second bearings are respectively in an angle to the vehicle transverse direction employed. Through this employment of Bearing is a rotational movement of the axle body under lateral force creates a virtual fulcrum behind the wheel center. This supports in an advantageous manner Way in addition the understeering self-steering behavior of the torsion beam axle.

Preferably is in this case, the starting angle of the bearing 45 °.

In Advantageously, the first and second bearings are designed such that the bearings have a high radial stiffness, as well as a low have axial rigidity and a low torsional stiffness. while due to the high radial rigidity and the low axial rigidity a positive effect on the steering characteristic ensured under lateral force is, causes the low torsional stiffness due to the low Nebenfederrate a comfort increase.

Further Advantages, features and applications of the present Invention will become apparent from the following description in conjunction with the embodiments shown in the drawing.

The Invention will be described below with reference to the drawing embodiments described in more detail. In the description, in the claims and in the drawing those in the attached below List of reference symbols used terms and associated reference numerals used.

In the drawing mean:

1a a plan view of a first embodiment of a torsion beam axle according to the invention;

1b a rear view of the twist beam axle 1a ;

2a a plan view of a second embodiment of the torsion beam axle according to the invention and

2 B a rear view of the twist beam axle 2a ,

1a shows more or less schematically a plan view of a whole with the reference numeral 10 designated twist beam axle of a motor vehicle. The vehicle longitudinal direction of the motor vehicle is symbolized by an arrow FL, and the vehicle transverse direction by an arrow FQ.

The torsion beam axle 10 essentially comprises an axle body oriented in the vehicle transverse direction FQ 12 and a first and a second in the vehicle longitudinal direction aligned FL trailing arm 14 . 16 , The axle body 12 is here rigid and torsionally soft, while the first trailing arm 14 and the second trailing arm 16 are formed bending and torsionally rigid.

The first and second trailing arm 14 . 16 each have a front end 14a . 16a and a back end 14b . 16b on. The front ends 14a . 16a the trailing arm 14 . 16 are fixed to the axle body 12 connected. At the back ends 14b . 16b the trailing arm 14 . 16 is each a wheel 18 . 20 stored.

The torsion beam axle 10 furthermore comprises a first and a second wishbone aligned respectively in the vehicle transverse direction FQ 22 . 24 , The first wishbone 22 and the second wishbone 24 each have one to the wheels 18 . 20 pointing outer end 22a . 24a and in each case one aligned to an imaginary vehicle longitudinal center axis LM inner end 22b . 24b on.

The outer ends 22a . 24a of the first and second control arm 22 . 24 are at the first and second trailing arm 14 . 16 stored. The inner ends 22b . 24b of the first and second control arm 22 . 24 are over a coupling link 26 rotatable around a storage point 28 to egg nem, in the present case for clarity only schematically illustrated vehicle body 30 stored.

Seen in the vehicle longitudinal direction FL is the coupling link 26 and thus the storage of the inner ends 22b and 24b of the first and second control arm 22 . 24 arranged behind the wheel center. In addition, the corresponding bearing points of the inner ends are 22b and 24b the two wishbones 22 . 24 on the imaginary vehicle longitudinal center line LM.

The bearings of the wishbones 22 . 24 , namely the storage of the outer ends 22a . 24a at the trailing arms 14 . 16 and the storage of the inner ends 22b . 24b at the Koppelnker 26 , as well as the storage of the coupling link 26 on the vehicle body 30 are each formed radially stiff and torsionally soft. The high radial stiffness and the low torsional rigidity of the bearings ensures precise lateral guidance and high comfort due to the low secondary spring rate.

About a double storage, namely a first camp 32 and a second camp 34 is the torsion beam axle 10 pivotable about a respective bearing axis 32a . 34a on the vehicle body 30 stored.

The special design and the spatial arrangement of the coupling link 26 are in 1b shown.

The coupler 26 has a substantially triangular base and is the bearing point 28 rotatable on the vehicle body 30 stored. Seen in the vertical direction V Rich lies the bearing point 28 between the articulation point of the inner end 22b of the first transverse link 22 at the Koppelnker 26 and the articulation point of the inner end 24b of the second transverse link 24 at the Koppelnker 26 ,

The coupler 26 causes a guide of the inner ends 22b . 24b of the first and second control arm 22 . 24 and ensures that the inner ends 22b . 24b the first and second wishbone only a rotational movement about the bearing point 28 can execute.

Due to the special design of the coupling link 26 it is ensured that during a compression / compression of the wheels 18 . 20 the wishbones 22 . 24 can only perform a guided in a vertical direction compensating movement, ie that the coupling link 26 the transverse movement of the inner ends caused by the extension or compression movement 22b . 24b the wishbone 22 . 24 balances.

Another embodiment of the torsion beam axle according to the invention is in 2 shown.

Of the For simplicity, the corresponding components with the denoted by the same reference numerals.

In the 2a illustrated embodiment of the torsion beam axle according to the invention 10 has essentially the same structure as that in 1a shown twisted beam axle on: An aligned in the vehicle transverse direction FQ, rigid and torsionally soft trained axle body 12 , in the vehicle longitudinal direction aligned FL, bending and torsionally stiff trained trailing arm 14 . 16 whose forward ends viewed in the vehicle longitudinal direction FL 14a . 16a firmly with the axle body 12 are connected and at the rear ends 14b . 16b one wheel each 18 . 20 is mounted, and two aligned in the vehicle transverse direction FQ wishbone 22 . 24 their respective wheel side outer ends 22a . 24a at the trailing arms 14 . 16 stored and their inner ends 22b . 24b over a coupling link 26 rotatable about a bearing point 28 on the vehicle body 30 are stored.

According to the present embodiment, the bearing axes of rotation 32a . 34a of the first and second camp 32 . 34 each set at an angle α to the vehicle transverse axis FQ, so that the bearing axes of rotation 32a . 34a in the vehicle longitudinal direction FL viewed in front of the axle body 12 to cut. By this employment of the first and second camp 32 . 34 becomes a rotary motion of the axle body 12 under lateral force around a virtual pivot 36 behind the center of the wheel. This additionally supports the desired understeering self-steering behavior of the torsion beam axle 10 ,

In particular 2 B shows is in the present embodiment, the coupling link 26 formed substantially rod-shaped. According to the in 1 illustrated embodiment is the bearing point 28 of the coupler 26 viewed in the vertical direction V again between the two inner ends 22b and 24b the two wishbones 22 . 24 arranged. Unlike the in 1 illustrated embodiment, the bearing point 28 However, on the imaginary Ver connecting line between the respective inner ends of the wishbone.

The already described straight guide the inner ends 22b . 24b the two wishbones 22 and 24 and the compensating movement made possible thereby is made possible in the same way also in this second embodiment.

10

Beam axle

12

axle body

14

first Trailing arm

14a

Front End of the first trailing arm

14b

rear End of the first trailing arm

16

second Trailing arm

16a

Front End of the second trailing arm

16b

rear End of the second trailing arm

18

wheel

20

wheel

22

first wishbone

22a

Outer end of the first transverse link

22b

Interior End of the first wishbone

24

second wishbone

24a

Outer end of the second transverse link

24b

Interior End of the second wishbone

26

coupling link

28

bearing point coupling link

30

vehicle body

32

first Bearing of the torsion beam axle

32a

axis of rotation of the first camp

34

second Bearing of the torsion beam axle

34a

axis of rotation of the second camp

36

virtual pivot point

FL

Vehicle longitudinal direction

FQ

Vehicle transverse direction

V

vertical direction

LM

Vehicle longitudinal central axis

α angle

Claims (10)

Twist-beam axle ( 10 ) for a motor vehicle, comprising a vehicle body transverse direction (FQ) aligned, rigid and torsionally soft formed axle body ( 12 ), two in the vehicle longitudinal direction (FL) aligned, bending and torsionally stiff trained trailing arm ( 14 . 16 ), whose front ends viewed in the vehicle longitudinal direction (FL) ( 14a . 16a ) fixed to the axle body ( 12 ) and at the rear ends ( 14b . 16b ) one wheel each ( 18 . 20 ) is mounted, and two in the vehicle transverse direction (FQ) aligned wishbone ( 22 . 24 ), whose respective wheel side outer ends ( 22a . 24a ) on the trailing arms ( 14 . 16 ) and their inner ends ( 22b . 24b ) on a vehicle body ( 30 ), characterized in that the inner ends ( 22b . 24b ) the wishbone ( 22 . 24 ) on one of the vehicle body ( 30 ) around a bearing point ( 28 ) rotatably mounted coupling links ( 26 ) are stored. Twist-beam axle ( 10 ) according to claim 1, characterized in that the mounting of the outer ends ( 22a . 24a ) the wishbone ( 22 . 24 ) on the trailing arms ( 14 . 16 ), the storage of the inner ends ( 22b . 24b ) the wishbone ( 22 . 24 ) at the Koppellenker ( 26 ) and the bearing of the coupling link ( 26 ) on the vehicle body ( 30 ) are formed radially stiff and torsionally soft. Twist-beam axle ( 10 ) according to claims 1 and 2, characterized in that the bearing point ( 28 ) of the coupling link ( 26 ) on the vehicle body ( 30 ) viewed in the vehicle longitudinal direction (FL) behind the wheel center and in the vehicle transverse direction (FQ) considered on an imaginary vehicle longitudinal center axis (LM) is arranged. Twist-beam axle ( 10 ) according to one of claims 1 to 3, characterized in that the bearing point ( 28 ) of the coupling link ( 26 ) in the vertical direction (V) viewed between the inner ends (V) 22b . 24b ) the wishbone ( 22 . 24 ) and that the bearing point ( 28 ) of the coupling link ( 26 ) laterally offset to an imaginary line connecting the inner ends ( 22b . 24b ) the wishbone ( 22 . 24 ) is arranged. Twist-beam axle ( 10 ) according to one of claims 1 to 3, characterized in that the bearing point ( 28 ) of the coupling link ( 26 ) in the vertical direction (V) viewed between the inner ends (V) 22b . 24b ) the wishbone ( 22 . 24 ) and that the bearing point ( 28 ) of the coupling link ( 26 ) on an imaginary connecting line between the inner ends ( 22b . 24b ) the wishbone ( 22 . 24 ) is arranged. Twist-beam axle ( 10 ) according to claim 4 or 5, characterized in that the bearing point ( 28 ) of the coupling link ( 26 ) in vertical direction (V) viewed above the axle body ( 12 ) is arranged. Twist-beam axle ( 10 ) according to one of the preceding claims, characterized in that the torsion beam axle ( 10 ) through a first warehouse ( 32 ) and a second warehouse ( 34 ) pivotable about a respective bearing axis of rotation ( 32a . 34a ) on the vehicle body ( 30 ) is stored. Twist-beam axle ( 10 ) according to claim 7, characterized in that the bearing axes of rotation ( 32a . 34a ) of the first and second bearings ( 32 . 34 ) are each at an angle (α) to the vehicle transverse direction (FQ) are employed. Twist-beam axle ( 10 ) according to claim 8, characterized in that the angle (α) is 45 °. Twist-beam axle ( 10 ) according to one of claims 7 to 9, characterized in that the first and second bearings ( 32 . 34 ) are formed radially stiff and axially and torsionally soft.