DE102021115633A1 - Wheel suspension for a vehicle - Google Patents

Abstract

The invention relates to a wheel suspension for a vehicle, with a wheel guide element (1, 3), such as a check arm, which can be pivoted at a bearing point (L1, L2) of a bearing bracket (5), the bearing point (L1, L2) having a screw bolt (7) which is guided through the wheel guide element (1, 3) and is attached to bracket wings (15) of the bearing bracket (5) on both sides of the wheel guide element (1, 3), and wherein the bearing point (L1, L2) is assigned an actuating unit is, by means of which the wheel guide element (1, 3) can be adjusted relative to the bearing bracket (5) by a travel distance (Δs). According to the invention, the control unit has a link guide in which the screw bolt (7) can be adjusted by the adjustment path (Δs) along a link track (17) of at least one of the console wings (15) in the manner of a link pin.

Description

The invention relates to a wheel suspension for a two-track vehicle according to the preamble of claim 1.

In such a wheel suspension, a wheel carrier carrying the vehicle wheel is articulated via a multi-link assembly to, for example, an auxiliary frame of a vehicle body. The multi-link assembly has a number of wheel control elements as wheel guide elements, which are articulated to bearing points on the subframe on the axle side and to bearing points on the wheel carrier on the wheel side. Exact positioning of the vehicle wheels relative to the road is of great importance with regard to safe and comfortable driving behavior of the vehicle. The positions of the kinematic points of wheel suspensions, which are defined by the respective bearing points, play an important role here. By adjusting the kinematic points, the wheel position variables and their change via the compression/rebound travel can be directly influenced. The two most important wheel position variables are the toe and camber angle. In order to ensure the correct wheel position variables in the wheel suspension, these must be adjusted using an actuator. These control units are also required to achieve different vehicle heights with identical wheel position variables. In addition, production-related component and/or manufacturing tolerances can be compensated for by means of the setting units.

From the DE 10 2019 208 585 A1 a generic wheel suspension is known in which a wheel guide element is articulated pivotably at a bearing point of a bearing bracket. The bearing point has a screw bolt which is passed through the wheel guide element and is fastened to console wings of the bearing console on both sides of the wheel guide element. The bearing point is assigned an adjustment unit, by means of which the wheel guide element can be adjusted by an adjustment distance relative to the bearing bracket.

In the DE 10 2019 208 585 A1 the control unit is an eccentric arrangement with an eccentric screw. When it is rotated, the height of the vehicle body is adjusted. Because of the geometric design of the eccentric arrangement, only a limited adjustment path that is limited to the eccentric dimension can be provided. In addition, there is no linear connection between an adjustment movement and a change in angle.

From the U.S. 5,398,411A a method for producing a wheel guide element for a vehicle is known. From the EP 1 932 692 A1 a bearing assembly for a control arm is known. From the EP 2 783 947 B1 an adjustment device for adjusting a wheel control arm is known. From the DE 44 37 661 A1 an adjusting device is known. From the DE 10 2014 226 536 A1 a control arm for a motor vehicle wheel suspension is known. From the DE 10 2015 101 438 A1 discloses a cam adjustable spacer assembly. From the DE 10 2014 201 876 A1 a device for adjusting the toe and/or camber for a motor vehicle chassis is known. From the WO 2016/041706 A1 a tie rod or steering rod for a vehicle is known. From the DE 41 15 110 C2 a device for factory presetting of vehicle wheels is known.

The object of the invention is to provide a wheel suspension for a two-track vehicle, the control unit of which has increased functionality compared to the prior art.

The object is solved by the features of claim 1. Preferred developments of the invention are disclosed in the dependent claims.

The invention is based on a wheel suspension for a two-track vehicle, in which a wheel guide element, in particular a check arm, is articulated in a pivotable manner at a bearing point of a bearing bracket. The bearing point has a screw bolt which is passed through the wheel guide element and is fastened to console wings of the bearing console on both sides of the wheel guide element. An actuating unit is also assigned to the bearing bracket. With the help of the adjusting unit, the wheel guide element can be adjusted by an adjusting distance in relation to the bearing bracket. According to the characterizing part of claim 1, the control unit has a link guide, in which the screw bolt is adjustable in the manner of a link pin along a link path of at least one of the console wings by a travel distance. The adjustment takes place with the screw bolt loosened. Preferably, the sliding track can be implemented as a slot in the console wing. The screw bolt, which is detached from the console wings, can be adjusted during the adjustment process between mechanical stops, in particular between the ends of the link track.

According to the invention, an adjustment of the wheel guide element can thus be implemented via a linear displacement of a kinematic point, ie the bearing point. Here, the screw is adjusted via a slotted track, in particular an elongated hole. An essential aspect of the invention relates to the fact that the adjusting movement takes place by rotating the screw bolt, which meshes with a bracket lateral gearing is, as will be described later in detail.

In a preferred embodiment variant, the actuating unit can have a gear wheel arrangement. When the loosened screw bolt is actuated by rotation about its screw axis, the gearwheel arrangement results in a motion-coupled actuating movement of the wheel guide element. If the rotational actuation of the loosened screw bolt is interrupted, the adjusting movement of the wheel guide element is also interrupted. In this case, the screw bolt can be tightened by means of a nut on the bearing bracket, as a result of which the wheel guide element is permanently set in the correct position relative to the bearing bracket.

In a specific embodiment variant, the gear wheel arrangement can have at least one gear wheel arranged on the screw bolt in a rotationally fixed manner. The gear wheel meshes with a corresponding counter tooth contour formed on the console wing. In a simple embodiment variant, the tooth counter-contour can be a tooth plate that is connected to the respective console wing by welding and screwing, for example.

In a first embodiment, the gear wheel on the bolt head of the screw bolt can be made from the same material and/or in one piece. Alternatively and/or additionally, the gear wheel can be secured as a separate component via an anti-twist device on the screw bolt. In this case, the gear wheel can have a bolt passage through which the screw bolt is guided. For anti-twist protection, the gear wheel can have a driver which protrudes in a form-fitting manner into a recess in the screw bolt. The recess can preferably be a longitudinal groove formed on the bolt shank. By means of the longitudinal groove, on the one hand a non-rotatable securing of the gear wheel is ensured and on the other hand an axial displacement of the gear wheel along the bolt shank is made possible.

The screw bolt rotary actuation and the actuating movement of the wheel guide element are coupled to one another in terms of movement via the gear wheel arrangement. After the adjustment movement of the wheel guide element has taken place, that is to say after completion of the screw bolt rotary actuation, the screw bolt is tightened by means of the nut.

To increase the elastokinematic properties of the wheel suspension, the bearing point can have a rubber-metal sleeve bearing. As an alternative to this, the bearing point can also be implemented as a ball and socket joint.

The rubber-metal sleeve bearing can be made up of an outer sleeve and a radially inner sleeve-shaped bearing core, between which an elastomer body is positioned. In the assembled position, the outer sleeve of the rubber-metal sleeve bearing can be pressed into a fastening eye of the wheel guide element. The screw bolt, which defines a pivot axis of the wheel guide element, can be guided through the radially inner sleeve-shaped bearing core. When the screw bolts are tightened, the opening edge area of the link track of the console wing and an interposed gear wheel between the bolt head/nut and an end face of the bearing core can be clamped.

In summary, the advantages of the invention lie in the fact that the adjustment travel is not limited by an eccentric geometry, but rather adjustment travels of any length are possible. In addition, a curved link path course is also possible in order to influence the camber/toe gradient. Furthermore, shearing forces on the driver of the toothed wheel can be reduced by the meshing. In contrast, with conventional eccentric screw connections, such drivers are often sheared off. In addition, according to the invention, the rotary actuation of the screw bolt takes place linearly with respect to the adjustment path, as a result of which there is a constant torque when adjusting the wheel guide element. In contrast to this, the adjustment torque for an eccentric screw connection has a sine curve. In addition, with the help of the invention, precise tolerancing of the guide webs of conventional eccentric adjustments can be omitted.

An exemplary embodiment of the invention is described below with reference to the accompanying figures.

• 1 die achsseitigen Lagerstellen zweier Radlenker einer Radaufhängung; und
• 2 eine der Lagerstellen in einer schematischen Schnittdarstellung.

Show it:

• 1 the axle-side bearing points of two wishbones of a wheel suspension; and
• 2 one of the bearing points in a schematic sectional view.

In the 1 two control arms 1, 3 are shown, which are part of a multi-link assembly of a wheel suspension of a two-track vehicle. The two check rails 1, 3 are articulated at axle-side bearing points L1, L2 on a bearing bracket 5 of the vehicle body. Both check rails 1, 3 are pivotally mounted about pivot axes S1, S2, which are each defined by bolts 7. In the 1 the two bearings L1, L2 are constructed identically. For a simpler ver According to the invention, the screw points and the gear wheel arrangements are shown in different orientations at the two bearing points L1, L2, so that the bolt shank side can be seen from the upper bearing point L1, while the bolt head side can be seen from the lower bearing point L2.

In the 2 one of the bearing points is shown in a sectional view. Accordingly, the wheel control arm has a fastening eye 9 in which a rubber-metal sleeve bearing 10 is pressed. The rubber-metal sleeve bearing 10 is made up of an outer sleeve 11 and a radially inner, sleeve-shaped bearing core 13 with an elastomer body 14 arranged in between. The screw bolt 7 extends through the radially inner, sleeve-shaped bearing core 13. Bracket wings 15 of the bearing bracket 5 are positioned on both sides of the fastening eye 9 of the wheel control arm, on which the screw bolt 7 is clamped.

How from the 1 shows, the bolt 7 is guided through slots 17 of the console wings 15. The elongated holes 17 are part of a slotted guide in which the screw bolt 7 can be adjusted along the elongated holes 17 by a travel distance Δs.

In the 2 the bolt 7 is tightened. In this case, the opening edge area of the elongated hole 17 of the left console wing 15 and an intermediate gear wheel 19 between the bolt head 21 of the screw bolt 7 and an end face of the radially inner bearing core 13 are braced. On the axially opposite side, the opening edge area of the elongated hole 17 of the right console wing 15 and another intermediate gear wheel 25 is clamped between a nut 27 and the other end face 23 of the bearing core 13 .

The two gears 19, 25 are part of a gear arrangement, which is based on the below 1 and 2 is described. Accordingly, the gear 19 is made of the same material and is formed in one piece on the bolt head 21 of the screw bolt 7 . The other gear wheel 25 is designed as a separate gear wheel disk and has a bolt passage through which the screw bolt 7 extends with its bolt shank 28 . A driver 29 is formed on the inner circumference of the toothed wheel disk 25 to prevent rotation. This protrudes in the 2 in a form-fitting manner in a longitudinal groove 31 of the bolt shank 28 .

The two gears 19, 25 are each in meshing ZE ( 2 ) with a toothed plate 33, which is arranged on the outside of each of the console wings 15. When mounting the bearing point L1, L2, the screw bolt 7 is first guided with its bolt shank 28 through the bracket wings 15 and through the intermediate inner bearing core 13 of the rubber-metal sleeve bearing 10. The toothed wheel disk 25 is then pushed onto the bolt shank 28 , with its driver 29 protruding into the longitudinal groove 31 . When the nut 27 is still loose, the two gears 19, 25 can roll meshingly on the two toothed plates 33 by means of a screw bolt rotary actuation. The screw bolt turning operation is continued until the check rail 1, 3 is set in the correct position. The bolt 7 is then tightened by means of the nut 27 .

Reference List

1.3

check handlebar

5

bearing bracket

7

bolts

9

mounting eye

10

Rubber-metal sleeve bearings

11

outer sleeve

13

bearing core

14

elastomer body

15

console wings

17

slots

19

gear

21

bolt head

23

Bearing core faces

25

gear

27

nut

28

bolt shank

29

driver

31

longitudinal groove

33

tooth plates

L1, L2

storage locations

S1, S2

pivot axes

ZE

meshing

QUOTES INCLUDED IN DESCRIPTION

This list of the 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 102019208585 A1 [0003, 0004]
• US5398411A [0005]
• EP 1932692 A1 [0005]
• EP 2783947 B1 [0005]
• DE 4437661 A1 [0005]
• DE 102014226536 A1 [0005]
• DE 102015101438 A1 [0005]
• DE 102014201876 A1 [0005]
• WO 2016041706 A1 [0005]
• DE 4115110 C2 [0005]

Claims (8)

Wheel suspension for a vehicle, with a wheel guide element (1, 3), such as a wheel control arm, which can be pivoted to a bearing point (L1, L2) of a bearing bracket (5), the bearing point (L1, L2) having a screw bolt (7). , which is guided through the wheel guide element (1, 3) and is attached to bracket wings (15) of the bearing bracket (5) on both sides of the wheel guide element (1, 3), and wherein the bearing point (L1, L2) is assigned an actuating unit by means of which the wheel guide element (1, 3) can be adjusted by an adjustment path (Δs) relative to the bearing bracket (5), characterized in that the adjustment unit has a link guide in which the screw bolt (7) in the manner of a link pin along a link track (17) at least one of the console wings (15) can be adjusted by the travel (Δs). suspension after claim 1 , characterized in that the link track (17) is realized as a slot in the console wing (15) and/or that the screw bolt (7) released from the console wings (15) can be adjusted between the track ends of the link track (17). suspension after claim 1 or 2 , characterized in that the actuating unit has a gear wheel arrangement, by means of which an actuating movement of the wheel guide element (1, 3) takes place when the loosened screw bolt (7) is rotated about its screw axis (S1, S2), and in that in particular when the rotary actuation of the loosened screw bolt (7), the adjusting movement of the wheel guide element (1, 3) is also interrupted. suspension after claim 3 , characterized in that the gear wheel arrangement has at least one gear wheel (19, 25) which is arranged in a torque-proof manner on the screw bolt (7) and which meshes (ZE) with a tooth counter-contour, in particular toothed plate (33), which is on the console wing (17) is trained. suspension after claim 4 , characterized in that the gear (19) on the bolt head (21) of the screw bolt (7), in particular of the same material and / or in one piece, is formed. suspension after claim 4 or 5 , characterized in that the gear wheel (25) is secured as a separate component via an anti-twist device on the screw bolt (7), and in that in particular the gear wheel (25) has a bolt passage through which the screw bolt (7) extends, and that the gear wheel (25) has a driver (29), in particular for the anti-twist device, which protrudes in a form-fitting manner into a recess (31) of the screw bolt (7), and that the recess is in particular a longitudinal groove (31) formed in the bolt shank (28). Wheel suspension according to one of the preceding claims, characterized in that after the adjustment movement of the wheel guide element (1, 3) has taken place, the rotary actuation of the bolt is terminated and the bolt (7) can be tightened by means of a nut (27). Wheel suspension according to one of the preceding claims, characterized in that the bearing point (L1, L2) is designed as a ball joint or a rubber-metal sleeve bearing (10), and in that in particular the rubber-metal sleeve bearing (10) has an outer sleeve (11 ), which is positioned in a fastening eye (9) of the wheel guide element (1, 3) and has a radially inner, sleeve-shaped bearing core (13) through which the screw bolt (7) is guided, and that, in particular when the screw bolt (7) is tightened, the edge area of the opening edge of the link track (17) of the console wing (15) and in particular an interposed gear wheel (19, 25) between the bolt head (21) and/or the nut (27) and an end face (23) of the bearing core (13).

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