DE102021131246A1 - Active chassis - Google Patents

Abstract

The invention relates to an active chassis (1), comprising a wheel suspension (2) with a wheel carrier (3) on which a vehicle wheel (4) is rotatably positioned, a front lower wishbone (5) and a rear lower wishbone (6), which each on the one hand pivotably arranged on a body (8) of a vehicle via a joint (7) and on the other hand each pivotably connected to the wheel carrier (3) via a joint (9), and a spring and/or damping element (10) on the one hand via a joint (11) on the rear lower wishbone (6) and on the other hand is connected via a dome (12) to the body (8), as well as a front upper wishbone (13) and a rear upper wishbone (14), wherein the front upper wishbone (13) and the rear upper wishbone (14) are connected to the wheel carrier (3) via a common joint (15), the front upper wishbone (13) and/or the rear upper wishbone (14) on the other hand are each operatively connected to an actuatable lever mechanism (16), the lever mechanism (16) having a lever (17) which can be pivoted relative to the body (8) via a joint (25) and which is connected to the front upper wishbone via a joint (18). (13) and / or the rear upper wishbone (14) is connected.

Description

The present invention relates to an active chassis, comprising a wheel suspension with a wheel carrier on which a vehicle wheel is rotatably positioned, a front lower wishbone and a rear lower wishbone, which are each arranged pivotably on the one hand via a joint on a body of a vehicle and on the other hand via a joint are pivotably connected to the wheel carrier, and a spring and/or damping element is supported on the one hand via a joint on the rear lower wishbone and on the other hand is connected to the body via a dome, as well as a front upper wishbone and a rear upper wishbone, wherein the front upper wishbone and the rear upper wishbone are connected on the one hand via a common joint to the wheel carrier.

In principle, multi-link axles with passive influence are known from the prior art, d. H. the wishbones or the coupling elements have a fixed length. The joints/connection elements on the wheel carrier/chassis also usually have a static position, i. H. They enable a defined kinematics/movement path when compressing and rebounding and when steering, thanks to a clever position arrangement. This can no longer be adjusted/changed while driving or if the load is unevenly distributed.

Out of DE 199 42 890 A1 for example, an adjusting device has become known which is arranged between a vehicle body section and a spring strut. It can be moved to change the effective length of the spring strut and the spread angle while driving. The movement includes a directional component in the vehicle vertical direction or a directional component transverse to a vehicle longitudinal axis and a directional component in the vehicle vertical direction. This arrangement in the upper suspension strut bearing enables a targeted adjustment of the spread angle and thus the camber of the wheel in question. An integral adjustment element is designed as a rotatable eccentric element which can be attached to the vehicle body section and on which the articulation point of the spring strut is provided eccentrically to its axis of rotation. For camber adjustment without side effects, more than one suspension link (usually two) usually has to be changed.

However, such active chassis still have some disadvantages, such as an increase in the unsprung masses or that the active chassis components in the area of the wheel are exposed to increased loads (shocks, G-load). Environmental influences, such as water, dirt, stone chipping or solar radiation, also always have a direct effect on these active chassis components within the wheel housing. In addition, power lines and control lines must be fed into a "rough environment".

The object of the invention is therefore to provide an active camber adjustment system for a chassis of a motor vehicle that can be produced inexpensively and avoids or at least reduces the problems mentioned at the outset.

This object is achieved by an active chassis, comprising a wheel suspension with a wheel carrier on which a vehicle wheel is rotatably positioned, a front lower wishbone and a rear lower wishbone, which are each arranged pivotably on the one hand via a joint on a body of a vehicle and on the other hand via a joint is pivotably connected to the wheel carrier, and a spring and/or damping element is supported on the one hand via a joint on the rear lower wishbone and on the other hand is connected to the body via a dome, as well as a front upper wishbone and a rear upper wishbone, the front upper wishbone and the rear upper wishbone being connected to the wheel carrier on the one hand via a common joint, the front upper wishbone and/or the rear upper wishbone on the other hand being operatively connected to an actuatable lever mechanism, the lever mechanism being opposite one via a joint the body has a pivotable lever which is connected via a joint to the front upper wishbone and/or the rear upper wishbone.

This has the advantage that, for example, only small passages in the dome or partition between the wheel housing and the engine compartment (interior) have to be provided for coupling elements. Furthermore, the joints can be arranged in the structurally strong dome area. Furthermore, the drive, actuators and/or the transmission of the active components of the chassis can be arranged inside and/or outside of the wheel housing.

For example, the camber angle of a wheel can be varied dynamically (while the roll angle increases when cornering or the pitch angle when braking) by actively causing a shift/displacement of the wishbones. In this way, optimal traction of the wheels with the road surface can be achieved, ie higher cornering speeds, shorter braking distances, etc. Basically, no With the active chassis according to the invention, a number of chassis parameters (camber, toe-in, toe-in, caster, etc.) can also be actively influenced.

According to an advantageous embodiment of the invention, it can be provided that the joint, which connects the pivotable lever to the front upper wishbone and/or the rear upper wishbone, is arranged within a region in the shape of a segment of a circle, which is relative to the axis of the front upper wishbone and/or of the rear upper wishbone, is spaced apart and has angle α≥25° and an angle β≥35° and a radius R of 0.1 to 200 mm. The position of the joint connected on the body side is thus within the area/circle segment, relative to the longitudinal axis of a wishbone, spaced apart by the angle α ≥ 25° and/or by the angle β ≥ 35° and/or R=radius between 0.1 and 200mm. The distance L1 and/or L2 (see claim 5) are preferably also within the radius R. The position of at least one further joint is preferably also within the segments described. The joint(s) can be part of the transmission mechanism and/or also lead to further transmission mechanisms and/or only lead to the coupling with drives.

According to a further preferred further development of the invention, it can also be provided that the lever mechanism comprises a transmission mechanism which can be coupled to an actuator on the input side and is connected to the pivotable lever on the output side, the transmission mechanism being arranged within a region in the shape of a segment of a circle which is relative to the axis the front upper wishbone and/or the rear upper wishbone, and angle α≥25° and an angle β≥35° and a radius R of 0.1 to 200 mm. At least one transmission mechanism is therefore provided relative to a wishbone. The position of the at least one transmission mechanism is within the area/circle segment, relative to the longitudinal axis of the wishbone, spaced by an angle α ≥ 25° and/or by an angle β ≥ 35° and/or R = radius between 0.1 and 200mm

Furthermore, according to a likewise advantageous embodiment of the invention, provision can be made for the transmission mechanism to have a joint which pivotably connects a coupling element to the actuator.

According to a further particularly preferred embodiment of the invention, it can be provided that a first distance L1 is defined between the joint that connects the coupling element and the pivotable lever to the actuator and the joint that connects the pivotable lever to the body, and between the Joint that connects the pivotable lever to the body and the joint that defines the pivotable lever with the front upper wishbone and / or the rear upper wishbone a second distance L2, the ratio of L1: L2 is chosen so that a Translation or reduction of the translation mechanism is formed.

Furthermore, the invention can also be further developed such that at least one of the joints is selected from the group of joint eyes, joint axes, joint forks and/or ball heads.

In a likewise preferred embodiment variant of the invention, it can also be provided that at least one of the joints is designed as a plain and/or ball bearing.

It can also be advantageous to further develop the invention in such a way that at least one of the joints has a sleeve and/or bushing for centering, guiding and/or abutting the articulated components.

According to a further preferred embodiment of the subject matter of the invention, it can be provided that at least one of the joints has a variation in the bearing friction, a variation in the end stop and/or a variation in the torsional and tilting rigidity.

Finally, the invention can also be advantageously implemented in such a way that the transmission mechanism has at least one lever, rocker arm, a shaft, a threaded spindle, a planetary roller screw drive, a ball screw drive and/or a gear worm gear.

The invention will be explained in more detail below with reference to figures without restricting the general inventive idea.

• 1 eine erste Ausführungsform eines aktiven Fahrwerks in einer schematischen kinematischen Schaltdarstellung,
• 2 die aus der 1 bekannte Ausführungsform eines aktiven Fahrwerks mit den Positionsbereichen für das Hebelgetriebe in einer schematischen kinematischen Schaltdarstellung,
• 3 eine zweite Ausführungsform eines aktiven Fahrwerks in einer schematischen kinematischen Schaltdarstellung,
• 4 die aus der 3 bekannte Ausführungsform eines aktiven Fahrwerks mit den Positionsbereichen für das Hebelgetriebe in einer schematischen kinematischen Schaltdarstellung,
• 5 eine freigestellte Detailansicht auf einen Übersetzungsmechanismus,
• 6 eine dritte Ausführungsform eines aktiven Fahrwerks mit den Positionsbereichen für das Hebelgetriebe in einer schematischen kinematischen Schaltdarstellung.

It shows:

• 1 a first embodiment of an active chassis in a schematic kinematic switching representation,
• 2 the one from the 1 known embodiment of an active chassis with the position ranges for the lever mechanism in a schematic kinematic switching representation,
• 3 a second embodiment of an active chassis in a schematic kinematic switching representation,
• 4 the one from the 3 known embodiment of an active chassis with the position ranges for the lever mechanism in a schematic kinematic switching representation,
• 5 an isolated detailed view of a translation mechanism,
• 6 a third embodiment of an active chassis with the position ranges for the lever mechanism in a schematic kinematic switching representation.

The figure shows 1 an active chassis 1, comprising a wheel suspension 2 with a wheel carrier 3 on which a vehicle wheel 4 is rotatably positioned. The wheel suspension 2 also has a front lower wishbone 5 and a rear lower wishbone 6, which are each arranged pivotably on the one hand via a joint 7 on a body 8 of a vehicle and on the other hand are each connected pivotably to the wheel carrier 3 via a joint 9.

A spring and/or damping element 10 is supported on the one hand via a joint 11 on the rear lower wishbone 6 and on the other hand is connected to the body 8 via a dome 12 . The wheel suspension 2 also has a front upper wishbone 13 and a rear upper wishbone 14, the front upper wishbone 13 and the rear upper wishbone 14 being connected to the wheel carrier 3 via a common joint 15 on the one hand.

On the other hand, the front upper wishbone 13 is operatively connected to an actuatable lever mechanism 16, the lever mechanism 16 having a lever 17 which can be pivoted via a joint 25 relative to the body 8 and is connected via a joint 18 to the front upper wishbone.

Alternatively or additionally, provision can also be made for the rear upper wishbone 14 to be operatively connected to an actuatable lever mechanism 16, with the lever mechanism 16 having a lever 17 which can be pivoted relative to the body 8 via a joint 25 and which is connected to the rear upper A-arm 14 is connected, just as in the 3 is shown.

From the 2 It can also be seen that the joint 18, which connects the pivotable lever 17 to the front upper wishbone 13, is arranged within a region 19 in the shape of a segment of a circle, which is spaced apart relative to the axis 20 of the front upper wishbone 13 and forms an angle α≥25° and has an angle β≥35° and a radius R of 0.1 to 200 mm. The longitudinal axis 20 of the wishbone 13,14 goes through the respective center of rotation at the beginning and at the end of the component. Ideally, this can be along the triangular link 13, 14 within the component or, due to a connected ball joint head and/or due to a laterally angled fork connection, also slightly outside of the component.

In the 4 is shown that the joint 18, which connects the pivotable lever 17 to the rear upper wishbone 14, is arranged within a circular segment-shaped area 19, which is spaced relative to the axis 20 of the rear upper wishbone 14 and an angle α ≥ 25 ° and a Angle β≥35° and a radius R of 0.1 to 200 mm.

The 1 and 3 It is also easy to see that the lever mechanism 16 comprises a transmission mechanism 21 which can be coupled to an actuator 22 on the input side and is connected to the pivotable lever 17 on the output side, with the transmission mechanism 21 being arranged within a region 23 in the shape of a segment of a circle which is relative to the axis 20 of the front upper wishbone 13 ( 2 ) and/or the rear upper wishbone 14 ( 4 ), is spaced apart and has an angle α≥25° and an angle β≥35° and a radius R of 0.1 to 200 mm.

Like in the 1 As shown, the transmission mechanism 21 has a joint 24 which pivotally connects a coupling element 25 to the actuator 22, which is arranged outside the wheel housing. A first distance L1 is defined between the joint 24, which connects the coupling element 25 and the pivotable lever 17 to the actuator 22, and the joint 25, which connects the pivotable lever 17 to the body 8, and between the joint 25 that connects the pivotable lever 17 connects to the body 8 and the joint 18, which defines the pivotable lever 17 with the front upper wishbone 13 and/or the rear upper wishbone 14, a second distance L2, the ratio of L1: L2 being chosen so that a Translation or reduction of the translation mechanism 21 is formed. This can also be well illustrated by the synopsis of 1 with 5 be traced.

At least one of the joints 7, 8, 11, 15, 18, 24, 25 can be selected from the group of joint eyes, joint axes, joint forks and/or ball heads. At least one of the joints 7,8,11,15,18,24,25 can be used as a sliding and/or be formed ball bearings. In principle, the transmission mechanism 21 can have at least one lever, rocker arm, a shaft, a threaded spindle, a planetary roller screw drive, a ball screw drive and/or a worm gear.

6 shows a wheel suspension 2 with a joint arrangement for a four-link/five-link, in which the connection of the wishbones 13, 14 to the wheel carrier 3 takes place via the separate joints 15a, 15b, 15c.

The invention is not limited to the embodiments shown in the figures. The foregoing description is therefore not to be considered as limiting but as illustrative. The following patent claims are to be understood in such a way that a mentioned feature is present in at least one embodiment of the invention. This does not exclude the presence of other features. If the patent claims and the above description define 'first' and 'second' feature, this designation serves to distinguish between two similar features without establishing a ranking.

Reference List

1

landing gear

2

suspension

3

wheel carrier

4

vehicle wheel

5

wishbone

6

wishbone

7

joint

8th

body

9

joint

10

damping element

11

joint

12

Dom

13

wishbone

14

wishbone

15

joint

16

lever gear

17

lever

18

joint

19

Area

20

axis

21

translation mechanism

22

actuator

23

area

24

joint

25

joint

26

coupling element

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was 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.

Patent Literature Cited

• DE 19942890 A1 [0003]

Claims (10)

Active chassis (1), comprising a wheel suspension (2) with a wheel carrier (3) on which a vehicle wheel (4) is rotatably positioned, a front lower wishbone (5) and a rear lower wishbone (6), each of which on the one hand has a Articulation (7) on a body (8) of a vehicle and on the other hand pivotally connected to the wheel carrier (3) via a joint (9), and a spring and/or damping element (10) on the one hand via a joint ( 11) on the rear lower wishbone (6) and on the other hand is connected to the body (8) via a dome (12), as well as a front upper wishbone (13) and a rear upper wishbone (14), the front upper wishbone (13) and the rear upper wishbone (14) on the one hand are connected to the wheel carrier (3) via a common joint (15), characterized in that the front upper wishbone (13) and/or the rear upper wishbone (14) on the other hand are each operatively connected to an actuatable lever mechanism (16), the lever mechanism (16) having a lever (17) which can be pivoted relative to the body (8) via a joint (25) and which is connected to the front upper triangular link ( 13) and/or the rear upper wishbone (14). Active chassis (1) according to claim 1 , characterized in that the joint (18), which connects the pivotable lever (17) to the front upper wishbone (13) and/or the rear upper wishbone (14), is arranged within a region (19) in the shape of a segment of a circle, which is relatively to the axis (20) of the front upper wishbone (13) and/or the rear upper wishbone (14) and has an angle α≥25° and an angle β≥35° and a radius R of 0.1 to 200 mm. Active chassis (1) according to one of the preceding claims, characterized in that the lever mechanism (16) comprises a transmission mechanism (21) which can be coupled to an actuator (22) on the input side and is connected to the pivotable lever (17) on the output side, wherein the transmission mechanism (21) is arranged within an area (23) in the shape of a segment of a circle, which is spaced apart relative to the axis (20) of the front upper wishbone (13) and/or the rear upper wishbone (14) and has an angle α≥25° and has an angle β≥35° and a radius R of 0.1 to 200 mm. Active chassis (1) according to one of the preceding claims, characterized in that the transmission mechanism (21) has a joint (24) which pivotably connects a coupling element (26) to the actuator (22). Active chassis (1) according to one of the preceding claims, characterized in that between the joint (24) which connects the coupling element (25) and the pivotable lever (17) to the actuator (22) and the joint (25) that the pivotable lever (17) to the body (8) connects a first distance L1 is defined and between the joint (25) that connects the pivotable lever (17) to the body (8) and the joint (18) that connects the A second distance L2 is defined on the pivotable lever (17) with the front upper wishbone (13) and/or the rear upper wishbone (14), the ratio of L1:L2 being selected such that a step-up or step-down of the step-up mechanism (21 ) is trained. Active chassis (1) according to one of the preceding claims, characterized in that at least one of the joints (7, 8, 11, 15, 18, 24, 25) is selected from the group of joint eyes, joint axes, joint forks and/or ball heads. Active chassis (1) according to one of the preceding claims, characterized in that at least one of the joints (7, 8, 11, 15, 18, 24, 25) is designed as a plain and/or ball bearing. Active chassis (1) according to any one of the preceding claims, characterized in that at least one of the joints (7,8,11,15,18,24,25) has a sleeve and/or bushing for centering, guiding and/or investing the has articulated components. Active chassis (1) according to one of the preceding claims, characterized in that at least one of the joints (7,8,11,15,18,24,25) has a variation in the bearing friction, a variation in the end stop and/or a variation in the rotation - exhibits tilting rigidity. Active chassis (1) according to one of the preceding claims, characterized in that the transmission mechanism (21) has at least one lever, rocker arm, a shaft, a threaded spindle, a planetary roller screw drive, a ball screw drive and/or a gear worm gear.

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