DE102008000591A1 - Torsion beam axle for motor vehicle, has controller connected with two parts of axle, where parts are actively rotatable against each other around active element and/or controller, so as to produce arbitrary anti-rolling torque - Google Patents

Abstract

The axle (1) has two longitudinal control arms (2, 3) connected with each other by a rigid and torsion-flexible middle piece. An active element (5) and/or controller are inserted in a middle region of the middle piece. The controller is connected with two parts (6, 7) of the axle. The parts are actively rotatable against each other around the active element and/or the controller, so as to produce arbitrary anti-rolling torque. The active element and/or the controller are designed as an electric motor with a downstreamly arranged transmission or as hydraulic oscillating motor.

Description

The The present invention relates to a torsion beam axle for a motor vehicle according to the generic term of claim 1

In Vehicle technology are used as rear axle composite beam steering axles often used. They comprise a composite link, which consists of two trailing arms that exists over a rigid but torsionally soft middle piece are interconnected. Here, the composite link is about two high volume Trailing arm attached to the body of the vehicle. In addition to Radführungsaufgaben takes over this component also the function of the stabilizer. In reciprocal Bouncing of the wheels will the middle piece twisted and thus generates an anti-momentum, the shaking of the vehicle body while the cornering counteracts.

Torsion beam axles advantageously have a low space requirement; They are also inexpensive can be produced and assembled. Nevertheless, twist-beam axles have the Disadvantage that kinematic and elastokinematic properties, For example, the wheel track, are only partially adjustable. Another Disadvantage is the complex design of the torsion beam, as bending and Torsional stiffnesses need to be matched to each other the desired adjust elastokinematic properties and the stabilizer effect.

Torsion beam axles are very complex components in terms of component strength, as overlap in the middle part of thrust and bending stresses. Strength problems often occur in the area of the weld seams, through which the middle part with the longitudinal parts or trailing arms connected is. Furthermore, the ride comfort can be problematic prove, since the leadership camp not run arbitrarily soft can be because such a design too strong lane changes under strong lateral forces and thus lead to a strong side force oversteer.

Out The prior art discloses active roll stabilization systems. where a stabilizer is integrated in the stabilizer. The actuators will be for example in the form of hydraulic swivel motors or electric motors, those in the stabilizer back be arranged, or represented by a length-adjustable pendulum support. With the help of this actuator, it is possible, any anti-roll torque dependent on of driving conditions, For example, the lateral acceleration to generate and thus the Rolling motion of the vehicle body to reduce. in disadvantageous Such systems prove to be costly.

Of the The present invention is based on the object, a torsion beam axle specify by which an active landing gear is represented in a simple manner can be.

These The object is solved by the features of claim 1. Further Embodiments of the invention and advantages are apparent from the dependent claims.

Therefore a torsion beam axle is proposed, in which preferably in the middle area of the middle piece at least one active element or actuator is inserted, which is connected to both resulting parts of the torsion beam axle is over the two parts of the torsion beam axis active against each other can be twisted, whereby arbitrary anti-rolling moments - depending on the driving conditions, such as z. B. the lateral acceleration - generated can be.

According to the invention can the active element or the actuator as an electric motor with a downstream transmission or as a hydraulic swing motor accomplished be.

Of the Steller is according to the invention preferably elastically on the two parts of the torsion beam axle connected, whereby the copying behavior of the compression movements of a Axis side is positively influenced on the other axis side. According to a development of the invention additionally or alternatively, the two parts of the torsion beam axle, however not the trailing arm itself, elastic be.

By the concept of the invention is on simple and inexpensive Way illustrated an active suspension, which is especially for smaller Vehicle classes is suitable. Furthermore, the presented here requires solution little space, as the active element compared to a conventional Twist-beam axle can be integrated almost space-neutral.

In Advantageously, by the invention of the prior Technique known compromise in the design of a composite link, in which a certain torsional rigidity to determine the desired Stabilizer effect with high bending strength for reduction of side force oversteer must be achieved, defused, because the anti-momentum through the active element is independent of the bending strength can be adjusted.

This also means that the two parts of the torsion beam axle can be made more rigid, whereby the side force oversteer - compared with a conventional, "passive" Ver Center link axle - can be reduced.

in the As part of a development of the invention, it is proposed that both parts of the torsion beam axle, but not the trailing arm (i.e., the parts corresponding to the center piece) as tubular parts accomplished are, which are supported on the likewise tubular active element. in this connection are inside the tubular Parts of the torsion beam axle the required signal and power cables deployable.

According to one another embodiment of the invention the two parts of the torsion beam axle with exception of the trailing arm also serve as actuators by providing these with electrically modifiable, longitudinally laid under approx. 45 ° Piezoceramic fibers are provided.

With active roll stabilization systems, the self-steering behavior over a Active distribution of the anti-rolling torque between the front and rear axles be influenced, whereby the driving safety is increased. In addition, the so-called copying effect in unilateral Radanregung, in which the unilateral compression movements by the stabilizer be copied to the other axis side, by decoupling the two wheels be reduced, which leads to an increase in comfort.

The Invention will be explained in more detail below with reference to the accompanying figure by way of example. It demonstrate:

1 A perspective view of a composite according to the prior art twist beam axle; and

2 A perspective view of a preferred embodiment of a torsion beam axle according to the present invention.

In 1 is a known from the prior art twist beam axle 1 shown. It includes two trailing arms 2 . 3 , which have a rigid but torsionally soft middle piece 4 connected to each other. When mutual compression of the wheels of the axle becomes the center piece 4 twisted, whereby an anti-roll moment is generated, which counteracts the roll of the vehicle body during cornering.

According to the invention and referring to 2 becomes a torsion beam axle 1 proposed for a motor vehicle, wherein in the central region of the axis an active element 5 or a steller is inserted, which with the by inserting the element 5 resulting parts 6 . 7 the axis 1 connected is.

About the active element 5 can the two parts 6 . 7 the torsion beam axis are actively rotated against each other based on the signals of a corresponding control or regulation function of the driving strategy and / or from the driving condition and / or the wheel kinematics sensors, whereby any anti-roll moments can be generated. The rotational movement is in 2 illustrated by the arrows. Here, the active element 5 or the actuator may be designed as an electric motor with a downstream transmission or as a hydraulic swing motor.

The actuator is preferably on the two parts 6 . 7 the torsion beam axle 1 elastically connected, whereby the copying behavior of the compression movements of one axle on the other axle side is positively influenced.

1

Beam axle

2

Trailing arm

3

Trailing arm

4

centerpiece

5

Writer Element, actuator

6

part the torsion beam axle

7

part the torsion beam axle

Claims (7)

Twist-beam axle ( 1 ) for a motor vehicle, comprising two trailing arms ( 2 . 3 ), which have a rigid but torsionally soft middle piece ( 4 ) are interconnected, characterized in that in the middle region of the middle piece ( 4 ) at least one active element ( 5 ) or an actuator is inserted, which with both resulting parts ( 6 . 7 ) of the torsion beam axle ( 1 ), the two parts ( 6 . 7 ) of the torsion beam axle ( 1 ) over the active element ( 5 ) or the actuator are actively rotated against each other, whereby any anti-rolling moments can be generated. Twist-beam axle ( 1 ) for a motor vehicle, according to claim 1, characterized in that the active element 5 or the actuator is designed as an electric motor with a downstream transmission or as a hydraulic swing motor. Twist-beam axle ( 1 ) for a motor vehicle, according to claim 1 or 2, characterized in that the active element ( 5 ) or the actuator on the two parts ( 6 . 7 ) of the torsion beam axle ( 1 ) is elastically connected, whereby the copying behavior of the compression movements of one axle on the other axle side is positively influenced. Twist-beam axle ( 1 ) for a motor vehicle, according to claim 1, 2 or 3, characterized that the two parts ( 6 . 7 ) of the torsion beam axle with the exception of the trailing arm ( 2 . 3 ) are designed to be elastic. Twist-beam axle ( 1 ) for a motor vehicle, according to one of the preceding claims, characterized in that both parts ( 6 . 7 ) of the torsion beam axle ( 1 ) with the exception of the trailing arm ( 2 . 3 ) are designed as tubular parts which are formed on the likewise tubular active element ( 5 ) or actuator support. Twist-beam axle ( 1 ) for a motor vehicle, according to claim 5, characterized in that inside the tubular parts of the torsion beam axle ( 1 ) the required signal and power cables can be laid. Twist-beam axle ( 1 ) for a motor vehicle, according to one of the preceding claims, characterized in that the two parts ( 6 . 7 ) of the torsion beam axle ( 1 ) with the exception of the trailing arm ( 2 . 3 ) serve as actuators, which are provided with electrically influenced, under about 45 ° longitudinally laid piezoceramic fibers.