DE102021207283A1 - Adjustable roll stabilizer - Google Patents

Abstract

Adjustable roll stabilizer (1) for a motor vehicle, with two stabilizer sections (2a, 2b) which can be rotated in opposite directions about an axis of rotation (7) by means of an actuator (6) arranged between the stabilizer sections (2a, 2b), the actuator (6) a housing (8) and a drive device (9) arranged therein with an output element (10) which is supported by means of a bearing device (13) so that it can rotate about the axis of rotation (7) relative to the housing (8) and is drive-connected to a stabilizer section (2b). is, wherein the bearing device (13) comprises two roller bearings (21, 22) with an inner ring (23, 24), an outer ring (25) and a row of roller bodies (26, 27), the inner ring (24) of an outer roller bearing (22) is fixed axially on both sides relative to the driven element (10), while the inner ring (23) of an inner roller bearing (21) is spring-loaded axially relative to the driven element (10).

Description

The invention relates to an adjustable roll stabilizer for a motor vehicle according to the preamble of claim 1.

It is known from motor vehicle technology to equip vehicles with a so-called roll stabilizer in order to increase vehicle stability and driving comfort in this way. In a simple embodiment, this is an essentially C-shaped torsion bar spring, which is mounted in the central area so that it can rotate with respect to the body and whose outer, opposite ends are each coupled to a wheel suspension. With this construction, the roll stabilizer ensures that the body of the vehicle not only deflects on the outside of the curve when cornering (caused by the centrifugal force), but also that the inside wheel is lowered slightly (copying behavior).

To further increase driving comfort, it is known from the prior art to make roll stabilizers of this type adjustable. For this purpose, the roll stabilizer includes an actuator and is divided into two stabilizer sections that can be rotated relative to one another with the aid of the actuator. By rotating the stabilizer sections relative to one another—about an axis of rotation—a rolling movement of the vehicle body is produced in a targeted manner or a rolling movement of the vehicle body caused by external influences is counteracted in a targeted manner. Known adjustable roll stabilizers are equipped with an actuator, which essentially has a housing and a drive device arranged therein, having an electric motor and a gear drive connected thereto, in particular in the form of a multi-stage planetary gear. Out DE 10 2015 220 176 A1 such an adjustable roll stabilizer for a motor vehicle is known.

In previously known adjustable roll stabilizers, the electric motor and a multi-stage planetary gear driven by it are arranged coaxially with respect to the axis of rotation of the roll stabilizer. Due to the design, the housing has a substantially cylindrical shape, with one of the stabilizer sections being non-rotatably connected to an axial end of the housing, while the second, opposite stabilizer section is drive-connected to an output element assigned to the drive device at the opposite axial end of the housing. The output element can be, for example, a planet carrier of the highest (output-side) stage of the multi-stage planetary gear, as in DE 10 2015 220 176 A1 . The output element is supported by a bearing device so that it can rotate about the axis of rotation relative to the housing of the actuator. In the aforementioned previously known adjustable roll stabilizer, the bearing device of the output element comprises according to the local 2 two roller bearings designed as double-row angular contact ball bearings. The inner ring of the roller bearing, which is the outer one in relation to the actuator housing, is axially preloaded by a securing element in the form of a special nut screwed axially from the outside onto the output element Rolling bearings are disadvantageously crushed. As a result, permanent deformation such as brittleness of the running surface and/or flattening of the rolling elements can occur.

It is an object of the present invention to specify an adjustable roll stabilizer of the type mentioned at the outset, which has a bearing of the output element that is improved in terms of robustness, while ensuring a high tilting rigidity of the bearing at the same time reducing the susceptibility to errors during assembly, in particular by allowing greater tolerances of the tightening torque target.

The object is achieved by an adjustable roll stabilizer for a motor vehicle according to the features of claim 1. According to the invention, this is an adjustable roll stabilizer with two stabilizer sections which can be rotated in opposite directions about an axis of rotation by means of an actuator arranged between the stabilizer sections. The actuator has a housing and a drive device arranged therein with an output element. The output element is supported by a bearing device so that it can rotate about the axis of rotation relative to the housing and is drivingly connected to a stabilizer section. The bearing device includes two roller bearings with an inner ring, an outer ring and a number of rolling elements. According to the invention, the adjustable roll stabilizer is characterized in that the inner ring of the outer roller bearing is fixed axially on both sides relative to the output element, while the inner ring of the inner roller bearing is spring-loaded axially relative to the output element.

The combination of features according to the invention provides that the bearing device of the output element further comprises two roller bearings, these being higher on the roll stabilizer to accommodate acting bending moments can be sufficiently spaced apart axially. Because of the two roller bearings, only the inner ring of the outer roller bearing is axially fixed relative to the output element, the inner ring of the inner roller bearing is not axially fixed relative to the output element, but represents a floating bearing due to a certain axial spring-loaded mobility Spring loading results in interaction with a backlash-free bearing, whereby an adjustment function of the bearing device is realized by the axial springing of the inner ring of the inner roller bearing, at the same time the axial springing ensures that even with excessive tightening torques of the securing element of the outer roller bearing, a permissible preload force within the bearing device is not exceeded will. This reduces the risk of incorrect assembly. The axial springing of the inner ring of the inner roller bearing helps to compensate for tightening torque tolerances.

According to an advantageous embodiment, the inner and the outer roller bearing together have a common outer ring.

In principle, the roller bearings can be various conceivable types of bearings. According to an advantageous development of the adjustable roll stabilizer, the inner and the outer roller bearing are designed as angular contact ball bearings aligned with one another in an O arrangement. As a result, the bearing device can absorb relatively high tilting moments despite an axially limited installation space.

In order to increase the robustness of the bearing, in particular with regard to acting bending moments, the inner and the outer roller bearing each have inner rings which are structurally separate from one another and are spaced apart axially from one another.

In order to achieve simple assembly that is less prone to errors and effective power transmission, the common outer ring is fixed axially on both sides relative to the housing, so that the outer roller bearing serves as a fixed bearing for the bearing device.

According to a preferred development of the bearing arrangement, the inner ring of the outer roller bearing is supported axially on the inside against the driven element, in particular against a shoulder formed thereon, and rests axially on the outside on a securing element that can be fitted onto the driven element, preferably in the form of a screw-on nut.

It is expediently provided that the inner ring of the inner roller bearing is axially displaceable—at least to a certain extent—relative to the driven element.

A preferred development of the adjustable roll stabilizer provides that the inner ring of the inner roller bearing is supported axially by means of a spring element in relation to the driven element, in particular in relation to a shoulder formed thereon. The spring element can be, for example, a spring acting in the axial direction, such as a plate spring or spiral spring.

Advantageously, in the mounted state, i.e. with the securing element applied, the spring element between the shoulder and the inner ring of the inner roller bearing is deformed in the axial direction, so that it exerts a restoring force in the axial direction in the sense of a prestress on the inner ring of the inner roller bearing. The preload applied by the spring element, in combination with the axial displaceability of the inner ring of the inner roller bearing, advantageously enables an adjustment function and/or tolerance compensation with regard to the tightening torque applied during assembly. This reduces the risk of assembly errors.

In principle, the roller bearings used according to the invention can be of the same type. Due to the different arrangement of the inner rings of the outer and inner roller bearing provided according to the invention, an advantageous design of the bearing device can be realized in that the rolling elements of the outer roller bearing have a larger diameter than the rolling elements of the inner roller bearing, so that the outer roller bearing is opposite to the inner roller bearing has a higher load rating.

During operational use, an adjustable roll stabilizer is exposed to different environmental influences such as moisture, dirt, temperature, exhaust gases and the like. Therefore, as is known, there is a need to seal the output element, which can be rotated about the axis of rotation, with respect to the housing of the actuator in order to prevent undesired substances from penetrating into the interior of the housing. Particularly in the case of an asymmetric bearing design as described above (larger rolling elements in the outer bearing than in the inner bearing), the different dimensioning of the bearing rings can result in the advantageous possibility of integrating a seal into the outer roller bearing, which prevents moisture from penetrating from the outside into the Interior of the housing prevented. Through this way into the camp With the integrated seal, a seal that is conventionally arranged outside of the axial securing element of the output element can be omitted, which simplifies the assembly of the adjustable roll stabilizer because there are fewer components to handle.

Depending on the design requirements for the adjustable roll stabilizer, actuators are known whose multi-stage planetary gear that can be driven by the electric motor is connected directly to the output element of the drive device. In this case, the output element is in particular in the planet carrier of the multi-stage planetary gear.

Alternatively, adjustable roll stabilizers are known whose drive train has a clutch between the electric motor and the driven element, which serves to dampen torsional vibrations in the drive train. In this case, the output element referred to here as such is drive-connected via a clutch to a planet carrier of a multi-stage planetary gear. The invention described above can be used on adjustable roll stabilizers of both types mentioned--with and without a torsion-damping clutch--in an identical manner.

• 1 einen verstellbaren Wankstabilisator für ein Kraftfahrzeug in schematischer Ansicht,
• 2 einen schematisch und vereinfacht dargestellten bekannten Aktuator eines verstellbaren Wankstabilisators in Schnittdarstellung,
• 3 eine Lagereinrichtung eines Aktuators eines erfindungsgemäßen verstellbaren Wankstabilisators in teilweiser Schnittdarstellung,
• 4 eine Variante einer Lagereinrichtung.

The invention is described below with reference to the drawing. It shows:

• 1 an adjustable roll stabilizer for a motor vehicle in a schematic view,
• 2 a schematic and simplified representation of a known actuator of an adjustable roll stabilizer in a sectional view,
• 3 a bearing device of an actuator of an adjustable roll stabilizer according to the invention in a partial sectional view,
• 4 a variant of a storage facility.

First shows 1 to illustrate the field of application of the invention, an adjustable roll stabilizer 1 for a motor vehicle in a schematic, perspective view. The roll stabilizer 1 is part of a chassis of a motor vehicle, which is not shown in full. A wheel 3a and a wheel 3b arranged on the opposite side of the vehicle are each connected to a body (not shown) of the motor vehicle via a wheel suspension 4a and 4b, respectively. Each of these wheel suspensions 4a and 4b is coupled to one end of an associated stabilizer section 2a or 2b of the adjustable roll stabilizer 1 via an associated pendulum support 5a, 5b. The two stabilizer sections 2a and 2b are connected to one another in the center of the vehicle via an actuator 6 .

In a way that is known per se, the roll stabilizer 1 is mounted so that it can rotate about an axis of rotation 7 relative to the vehicle body (not shown). The actuator 6, in 1 shown in simplified form as a cylindrical body, essentially comprises a housing 8 in which a drive device 9 is arranged. The drive device 9 comprises, in a manner known per se, an electric motor 11 and a multi-stage planetary gear 12 which is drive-connected thereto and which are arranged coaxially with respect to the axis of rotation 7 . The stabilizer sections 2a and 2b are drive-connected via the drive device 9 . When the electric motor is stationary, the two stabilizer sections 2a, 2b are rigidly connected to one another via the actuator 6. The operation of the electric motor allows the stabilizer sections 2a, 2b to rotate relative to one another about the axis of rotation 7, depending on the direction of rotation of the electric motor. The roll stabilizer 1 can thus be adjusted in a way that is known per se.

2 shows an actuator 6 in a sectional view and to explain the mode of operation, which is installed in an adjustable roll stabilizer as in FIG 1 shown, can be used. According to the sectional view, it can be seen that the actuator 6 extends along the axis of rotation 7 between the stabilizer section 2a and the stabilizer section 2b. An electric motor 11 is arranged in the housing 8 in a region of the housing 8 facing the stabilizer section 2a and is drive-connected to a three-stage planetary gear 12 . The electric motor 11 and the multi-stage planetary gear 12 form essential components of the drive device 9 of the actuator 6 with an output element 10 which is rotatably mounted by means of a bearing device 13 about the axis of rotation 7 relative to the housing. As indicated in the drawing, the driven element 10 is drive-connected to the stabilizer section 2b, for example welded or screwed thereto. On the other hand, the stabilizer section 2a is non-rotatably connected to the opposite axial end of the housing 8 . In the 2 storage device 13 shown corresponds to the prior art.

3 shows, in contrast, a bearing device 13 of an adjustable roll stabilizer according to an exemplary embodiment of the invention. An axial end of the housing 8 of an actuator of an adjustable roll stabilizer, which axial end faces the stabilizer section 2b, is shown in partial section. A planetary carrier 14 is assigned to the last, for example third stage of the three-stage planetary gear arranged in the housing. The planetary carrier 14 is drive-connected to the output element 10 via a clutch 15, which is not explained in detail. The output element 10 can be rotated about the axis of rotation by means of a bearing device 13 to be explained (cf. 1 and 2 ) stored relative to the housing 8. The output element 10 is firmly connected to the stabilizer section 2b in order to drive it, in a manner indicated here only by the reference number.

The bearing device 13 comprises two roller bearings 21 , 22 designed as angular ball bearings. A relative to the housing 8 outer roller bearing 22 has an inner ring 24, the outer ring 25 and a row of rolling elements 27.

The spherical rolling elements 26, 27 of the inner roller bearing 21 and the outer roller bearing 22 are axially spaced from each other. The inner ring 24 of the outer roller bearing 22 is fixed axially on both sides relative to the driven element 10 by being supported axially on the inside relative to a shoulder 17 formed on the driven element 10 . On the axial outside there is a securing element 28 in the form of a screw-on nut, which is screwed onto a thread formed on the output element 10, with the securing element 28 resting axially on the outside on the inner ring 24, as a result of which the inner ring 24 is fixed axially between the shoulder 17 and the securing element 28 without play .

In contrast, the inner ring 23 of the inner roller bearing 21 is spring-loaded in an axially displaceable manner relative to the output element 10 . As in 3 As can be seen, the inner ring 23 is supported axially by means of a spring element 30 against a shoulder 16 formed on the output element 10 so that the inner ring 23 can only be moved in the direction of the shoulder 16 against a spring force of the spring element 30 . The spring element 30 is, for example, a plate spring or spiral spring.

While the inner roller bearing 21 and the outer roller bearing 22 have structurally separate, axially spaced inner rings 23 and 24, the inner roller bearing 21 and the outer roller bearing 22 share the common outer ring 25. The outer ring 25 is fixed axially between a shoulder 18 of the housing 8 and a securing element 29 screwed in after the outer ring 25 has been installed.

The inner roller bearing 21 and the outer roller bearing 22 are designed as angular contact ball bearings aligned with one another in an O arrangement.

The rolling elements 27 of the outer roller bearing 22 have a larger diameter than the rolling elements 26 of the inner roller bearing 21, so that the outer roller bearing 22 has a greater load rating than the inner roller bearing 21.

In a mounted state as shown, i.e. with the securing element 28 applied, the spring element 30 is compressed in the axial direction between the shoulder 16 and the inner ring 23 of the inner roller bearing 21, so that due to the deformation of the spring element 30, this generates a restoring force in the axial direction a preload on the inner ring 23 of the inner roller bearing 21 exerts. This results on the one hand in a play-free bearing arrangement of the two angular contact ball bearings 21 and 22, and on the other hand an adjustment function is ensured by the spring force.

The interior of the housing 8 is sealed by a seal 17 which extends in an annular space between the output element 10 and an axial end of the housing 8 . The seal 17 comprises a radial shaft sealing ring as an essential element. The seal 17 is positioned axially outside of the securing elements 28 and 29, respectively.

4 shows a modification to the design of 3 in terms of sealing. In contrast to the design according to 3 is at the in 4 shown modification in the outer roller bearing 22, a seal 16 is integrated, which prevents the penetration of moisture from the outside into the interior of the housing 8. In the case of the in 4 In the modification shown, the seal 16 extends between the inner ring 24 of the outer roller bearing 22 and the common outer ring 25. A radial shaft sealing ring is again used as the essential sealing element, with the integration in the roller bearing 22 of another one located axially outside of the securing elements 28 and 29 Seal can be omitted in favor of facilitating assembly or reducing parts.

It should be noted that, unlike in 3 shown design, the output element can be a planet carrier of a multi-stage planetary gear.

reference list

1

adjustable roll stabilizer

2a, 2b

stabilizer section

3a, 3b

wheel

4a, 4b

suspension

5a, 5b

pendulum support

6

actuator

7

axis of rotation

8th

Housing

9

drive device

10

output element

11

electric motor

12

multi-stage planetary gear

13

storage facility

14

output side planet carrier

15

coupling

16

poetry

17

poetry

18

Unit volume

21

inner roller bearing

22

outer roller bearing

23

Inner ring inner roller bearing

24

Inner ring outer roller bearing

25

common outer ring

26

Rolling element inner roller bearing

27

Rolling element outer roller bearing

28

fuse element

29

fuse 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 102015220176 A1 [0003, 0004]

Claims (13)

Adjustable roll stabilizer (1) for a motor vehicle, with two stabilizer sections (2a, 2b) which can be rotated in opposite directions about an axis of rotation (7) by means of an actuator (6) arranged between the stabilizer sections (2a, 2b), the actuator (6) a housing (8) and a drive device (9) arranged therein with an output element (10) which is supported by means of a bearing device (13) so that it can rotate about the axis of rotation (7) relative to the housing (8) and is drive-connected to a stabilizer section (2b). is, wherein the bearing device (13) comprises two roller bearings (21, 22) with an inner ring (23, 24), an outer ring (25) and a row of rolling bodies (26, 27), characterized in that the inner ring (24) of an outer roller bearing (22) is fixed axially on both sides relative to the driven element (10), while the inner ring (23) of an inner roller bearing (21) is spring-loaded axially relative to the driven element (10). Adjustable roll stabilizer claim 1 , characterized in that the inner and the outer roller bearing (21, 22) together have a common outer ring (25). Adjustable roll stabilizer claim 1 or 2 , characterized in that the inner and the outer roller bearing (21, 22) are designed as mutually aligned in an O-arrangement angular contact ball bearings. Adjustable roll stabilizer according to one of the preceding claims, characterized in that the inner and the outer roller bearing (21, 22) each have inner rings (23, 24) which are structurally separate from one another and are spaced apart axially from one another. Adjustable roll stabilizer according to one of claims 2 until 4 , characterized in that the common outer ring (25) is fixed axially on both sides relative to the housing (8), so that the outer roller bearing (22) serves as a fixed bearing of the bearing device (13). Adjustable roll stabilizer according to one of the preceding claims, characterized in that the inner ring (24) of the outer roller bearing (22) is supported axially on the inside against the driven element (10), in particular against a shoulder (17) formed thereon, and axially on the outside on a Driven element (10) applicable fuse element (28), preferably applied in the form of a nut. Adjustable roll stabilizer according to one of the preceding claims, characterized in that the inner ring (23) of the inner roller bearing (21) can be displaced axially with respect to the output element (10). Adjustable roll stabilizer according to one of the preceding claims, characterized in that the inner ring (23) of the inner roller bearing (21) is supported axially by means of a spring element (30) in relation to the driven element (10), in particular in relation to a shoulder (16) formed thereon. Adjustable roll stabilizer claim 8 , characterized in that in the mounted state, i.e. when the securing element (28) is applied, the spring element (30) is deformed in the axial direction between the shoulder (16) and the inner ring (23) of the inner roller bearing (21), so that this one Restoring force exerts in the axial direction in the sense of a preload on the inner ring (23) of the inner roller bearing (21). Adjustable roll stabilizer according to one of the preceding claims, characterized in that the rolling elements (27) of the outer rolling bearing (22) have a larger diameter than the rolling elements (26) of the inner rolling bearing (21), so that the outer rolling bearing (22) relative to the inner roller bearing (21) has a larger load rating. Adjustable roll stabilizer according to one of the preceding claims, characterized in that a seal (16) is integrated into the outer roller bearing (22) and prevents moisture from penetrating from the outside into the interior of the housing (8). Adjustable roll stabilizer according to one of the preceding claims, characterized in that the output element (10) is a planet carrier of a multi-stage planetary gear (12). Adjustable roll stabilizer according to one of Claims 1 until 11 , characterized in that the output element (10) via a clutch (15) with a planet carrier (14) of a multi-stage planetary gear (12) is in drive connection.

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