WHEEL SUSPENSION FOR A MOTOR VEHICLE AND CORRESPONDING MOTOR VEHICLE

Abstract

A wheel suspension for motor vehicle, having a wheel mount rotatably mounted around a steering axis for steering the motor vehicle, on which a wheel hub supporting a rim of a wheel is rotatably mounted or mountable by means of a wheel bearing around a wheel hub rotational axis and which has a bearing point for attaching a tie rod and having a first suspension arm arrangement and a second suspension arm arrangement, which engage on the wheel mount spaced apart from one another in the actual direction with respect to the steering axis for coupling the wheel mount to a vehicle body of the motor vehicle.

Claims

1-10. (canceled)

11. A wheel suspension for motor vehicle, comprising: a wheel mount rotatably mounted around a steering axis for steering the motor vehicle, on which a wheel hub supporting a rim of a wheel of the motor vehicle is rotatably mounted or mountable by means of a wheel bearing around a wheel hub rotational axis and which has a bearing point for attaching a tie rod and having a first suspension arm arrangement and a second suspension arm arrangement, which engage on the wheel mount spaced apart from one another in the axial direction with respect to the steering axis for coupling the wheel mount to a vehicle body of the motor vehicle, wherein in the installed position of the wheel suspension, a kinematic point of a tie rod bearing, used for attaching the tie rod to the bearing point, is arranged in the travel direction of the motor vehicle in front of the steering axis and above a horizontal plane, which accommodates or intersects the wheel hub rotational axis and is arranged horizontally.

12. The wheel suspension according to claim 11, wherein the first suspension arm arrangement and/or the second suspension arm arrangement each have a resolved suspension arm composite and/or at least one individual suspension arm.

13. The wheel suspension according to claim 11, wherein the tie rod bearing directly adjoins the horizontal plane or is arranged above the horizontal plane.

14. The wheel suspension according to claim 11, wherein the tie rod bearing is used for rotatably mounting the tie rod around a tie rod rotational axis, wherein the kinematic point is provided in the direction of the tie rod rotational axis within the tie rod bearing.

15. The wheel suspension according to claim 11, wherein the kinematic point is arranged between the horizontal plane and a plane parallel to the horizontal plane, which accommodates a vertex of a wheel bearing receptacle formed in the wheel mount to accommodate the wheel bearing.

16. The wheel bearing arrangement according to claim 11, wherein the rim has a rim jacket and a tangential plane above the horizontal plane tangentially abuts the rim jacket, wherein the tangential plane is perpendicular to the steering axis or is arranged in parallel to the horizontal plane, and wherein the kinematic point is arranged between the horizontal plane and the tangential plane.

17. The wheel suspension according to claim 11, wherein the first suspension arm arrangement engages on the wheel mount on the side of the tangential plane facing away from the horizontal plane, and/or in that the second suspension arm arrangement engages on the wheel mount on the side of the horizontal plane facing away from the kinematic point.

18. The wheel mount arrangement according to claim 11, wherein the first suspension arm arrangement forms a first suspension arm plane and the second suspension arm arrangement forms a second suspension arm plane, wherein, in a top view of the rim jacket, in the axial direction with respect to the wheel hub rotational axis the first suspension arm plane and the second suspension arm plane are arranged inside the rim jacket, or one of the suspension arm planes is arranged outside the rim jacket and the respective other one is arranged inside the rim jacket, in particular an upper of the suspension arm planes in the installed position is provided outside the rim jacket.

19. The wheel suspension according to claim 11, wherein a further tangential plane different from the tangential plane tangentially abuts the rim jacket below the horizontal plane, wherein the further tangential plane is perpendicular to the steering axis or is arranged in parallel to the horizontal plane, wherein the second suspension arm arrangement engages on the wheel mount between the horizontal plane and the further tangential plane.

20. A motor vehicle having a wheel suspension, in particular a wheel suspension as claimed in claim 11, wherein the wheel suspension has a wheel mount rotatably mounted around a steering axis for steering the motor vehicle, on which a wheel hub supporting a rim of a wheel of the motor vehicle is rotatably mounted around a wheel hub rotational axis and which has a bearing point for attaching a tie rod, and has a first suspension arm arrangement and a second suspension arm arrangement, which engage spaced apart from one another in the axial direction with respect to the steering axis on the wheel mount for coupling the wheel mount to a vehicle body of the motor vehicle, wherein in the installed position of the wheel suspension, a kinematic point of a tie rod bearing used for attaching the tie rod to the bearing point is arranged in the travel direction of the motor vehicle in front of the steering axis and above a horizontal plane, which accommodates or intersects the wheel hub rotational axis and is arranged horizontally.

21. The wheel suspension according to claim 12, wherein the tie rod bearing directly adjoins the horizontal plane or is arranged above the horizontal plane.

22. The wheel suspension according to claim 12, wherein the tie rod bearing is used for rotatably mounting the tie rod around a tie rod rotational axis, wherein the kinematic point is provided in the direction of the tie rod rotational axis within the tie rod bearing.

23. The wheel suspension according to claim 13, wherein the tie rod bearing is used for rotatably mounting the tie rod around a tie rod rotational axis, wherein the kinematic point is provided in the direction of the tie rod rotational axis within the tie rod bearing.

24. The wheel suspension according to claim 12, wherein the kinematic point is arranged between the horizontal plane and a plane parallel to the horizontal plane, which accommodates a vertex of a wheel bearing receptacle formed in the wheel mount to accommodate the wheel bearing.

25. The wheel suspension according to claim 13, wherein the kinematic point is arranged between the horizontal plane and a plane parallel to the horizontal plane, which accommodates a vertex of a wheel bearing receptacle formed in the wheel mount to accommodate the wheel bearing.

26. The wheel suspension according to claim 14, wherein the kinematic point is arranged between the horizontal plane and a plane parallel to the horizontal plane, which accommodates a vertex of a wheel bearing receptacle formed in the wheel mount to accommodate the wheel bearing.

27. The wheel bearing arrangement according to claim 12, wherein the rim has a rim jacket and a tangential plane above the horizontal plane tangentially abuts the rim jacket, wherein the tangential plane is perpendicular to the steering axis or is arranged in parallel to the horizontal plane, and wherein the kinematic point is arranged between the horizontal plane and the tangential plane.

28. The wheel bearing arrangement according to claim 13, wherein the rim has a rim jacket and a tangential plane above the horizontal plane tangentially abuts the rim jacket, wherein the tangential plane is perpendicular to the steering axis or is arranged in parallel to the horizontal plane, and wherein the kinematic point is arranged between the horizontal plane and the tangential plane.

29. The wheel bearing arrangement according to claim 14, wherein the rim has a rim jacket and a tangential plane above the horizontal plane tangentially abuts the rim jacket, wherein the tangential plane is perpendicular to the steering axis or is arranged in parallel to the horizontal plane, and wherein the kinematic point is arranged between the horizontal plane and the tangential plane.

30. The wheel bearing arrangement according to claim 15, wherein the rim has a rim jacket and a tangential plane above the horizontal plane tangentially abuts the rim jacket, wherein the tangential plane is perpendicular to the steering axis or is arranged in parallel to the horizontal plane, and wherein the kinematic point is arranged between the horizontal plane and the tangential plane.

Description

[0041] The invention is explained in greater detail hereinafter on the basis of the exemplary embodiments illustrated in the drawings, without the invention being restricted. In the figures

[0042] FIG. 1 shows a schematic illustration of a wheel suspension for a motor vehicle, and

[0043] FIG. 2 shows a diagram in which a toe angle is plotted over a lateral force.

[0044] FIG. 1 shows a schematic illustration of a wheel suspension 1 for a motor vehicle in the installed position. The wheel suspension 1 is thus arranged in a motor-vehicle-fixed coordinate system, wherein the direction x describes a longitudinal axis of the motor vehicle and the direction y describes a vertical axis of the motor vehicle. A transverse axis is perpendicular to these two axes, i.e., to both the longitudinal axis and also the vertical axis.

[0045] The wheel suspension 1 has a wheel mount 2, by means of which a wheel 3 of the motor vehicle is rotatably mounted, specifically with respect to a vehicle body (not shown here) of the motor vehicle. The wheel 3 has a rim 4, which has a rim jacket 5 and rim walls, which originate from the rim jacket 5 and extend outward in the radial direction with respect to a rotational axis 7 of the wheel 3. The rim 4 is fastened on a wheel hub (not shown in greater detail here), which is in turn rotatably mounted with respect to the wheel mount 2 by means of a wheel bearing (also not shown). The rotational axis 7 describes in this case the rotational axis of the wheel hub or the wheel bearing, so that it can also be referred to as the wheel hub rotational axis.

[0046] The wheel mount 2 is linked or is linkable by means of a first suspension arm arrangement 8 and a second suspension arm arrangement 9 on a vehicle body of the motor vehicle. The first suspension arm arrangement 8 has suspension arms 10 and 11 in the illustrated exemplary embodiment, the second suspension arm arrangement 9 has suspension arms 12 and 13. The suspension arms 10, 11, 12, and 13 are each designed as two-point suspension arms and are rotatably or pivotably mounted on the wheel mount 2. The two suspension arm arrangements 8 and 9 engage spaced apart from one another in the axial direction with respect to a steering axis 14 on the wheel mount 2.

[0047] Two suspension arm planes are thus formed, wherein a first suspension arm plane is represented by the first suspension arm arrangement 8 and a second suspension arm plane is represented by the second suspension arm arrangement 9. The wheel mount 2 is rotatable with respect to the vehicle body around the steering axis 14, i.e., is rotatably mounted or can be mounted on the vehicle body around the steering axis 14. The wheel mount 2 is correspondingly rotatable around the steering axis 14 for steering the motor vehicle. In other words, the wheel 3 is a steerable wheel. The steering axis 14 is defined by the first suspension arm arrangement 8 and the second suspension arm arrangement 9, wherein each of the suspension arm arrangements 8 and 9 defines an instantaneous center of rotation and the steering axis 14 is provided as the imaginary straight line extending through the instantaneous centers of rotation.

[0048] The wheel mount 2 has a bearing point 15 for attaching a tie rod 16 to the wheel mount 2. A pivot movement of the wheel mount 2 around the steering axis 14, which is used for steering the motor vehicle, can be applied to the wheel mount 2 via the tie rod 16. A tie rod bearing 17, via which the tie rod 16 is attached to the wheel mount 2, is provided for mounting the tie rod 16 on the wheel mount 2 or the bearing point 15. The tie rod bearing 17 has a kinematic point 18, around which the tie rod 16 is pivotable with respect to the wheel mount 2.

[0049] In the installed position of the wheel suspension 1 shown here, the kinematic point 18 is located in front of the steering axis 14 in the travel direction indicated by an arrow 21. Moreover, it is arranged above a horizontal plane 19, which accommodates the rotational axis 7 and is arranged horizontally, namely with respect to an underlying surface (not shown here), on which the motor vehicle is located. The steering axis 14 is preferably angled with respect to the horizontal plane 19, and thus encloses an angle with it which is greater than 0° and less than 180°. A tangential plane 20, which tangentially abuts the rim jacket 5, is provided in parallel to the horizontal plane 19.

[0050] It can be seen clearly that the first suspension arm arrangement 8 is arranged on the side of the tangential plane 20 facing away from the horizontal plane 19 and also engages there on the wheel mount 2. The second suspension arm arrangement 9, in contrast, is provided on the side of the horizontal plane 19 facing away from the tangential plane 20 and also engages there on the wheel mount 2. In other words, the second suspension arm arrangement 9 is provided below the horizontal plane 19. Moreover, the kinematic point 18 is arranged above the horizontal plane 19, in particular between the horizontal plane 19 and the tangential plane 20.

[0051] In addition to the tangential plane 20, a further tangential plane (not shown here) can be defined, which is provided below the horizontal plane 19, i.e., on the side of the horizontal plane 19 facing away from the tangential plane 20, and tangentially abuts the rim jacket 5 there. The further tangential plane is also preferably arranged in parallel to the horizontal plane 19. In other words, the further tangential plane results by way of mirroring of the tangential plane 20 at the horizontal plane 19. The second suspension arm arrangement 9 is preferably arranged at least partially or even completely between the horizontal plane 19 and the further tangential plane.

[0052] Using the above-described design of the wheel suspension 1, in which the kinematic point 18 or a center of rotation of the tie rod bearing 17 is located above the horizontal plane 19 and in front of the steering axis 14 in the travel direction, a negative toe angle, which results during cornering of the motor vehicle due to the lateral force on the outside wheel, can be significantly reduced. This in turn results in a reduction of the dynamic amplification of the yaw rate of the motor vehicle or of a steering wheel angle. The driving comfort and the driving stability of the motor vehicle are significantly improved in this way.

[0053] FIG. 2 shows a diagram in which a toe angle is plotted over the lateral force for an outside wheel during cornering of the motor vehicle. An absolute value or amount of the lateral force becomes greater viewed from right to left, and absolute value of the toe angle from top to bottom. A curve 22 shows the toe angle for the described wheel suspension 1, a curve 22, in contrast, for a conventional wheel suspension. It is clearly apparent that the absolute value of the toe angle rises more slowly with increasing lateral force for the curve 22 than for the curve 23.