DE102016102863A1 - Steering intermediate shaft for a motor vehicle and method for operating a steering intermediate shaft for a motor vehicle - Google Patents

Abstract

The invention relates to a steering intermediate shaft (1) for a motor vehicle, wherein the guide element (18, 28, 38) for displacing the inner hollow shaft (12) in the axial direction of the outer hollow shaft (10) and for transmitting one of the outer hollow shaft (10) the guide element (18, 28, 38) acting torque on the inner hollow shaft (12) at least partially against the outer hollow shaft (10) and the inner hollow shaft (12) and is formed substantially rod-shaped. The invention further relates to a method for operating a steering intermediate shaft for a motor vehicle.

Description

The invention relates to a steering intermediate shaft for a motor vehicle. The invention further relates to a method for operating a steering intermediate shaft for a motor vehicle.

State of the art

Steering intermediate shafts are usually designed such that they are designed to be extensible and / or shortenable. This is intended to ensure that occurring during a driving operation of the motor vehicle relative movements between a driver's cab and a vehicle chassis remain without affecting the steering behavior of the motor vehicle.

The US 2011/0098121 A1 discloses a device for coupling an inner shaft and an outer shaft, which are displaceable in the direction of a common axis. Bullets are provided between the two shafts. The balls are arranged in axial grooves of the inner shaft and in axial grooves of the outer shaft. Each row of balls is held in position by an elastic member disposed in the groove of the inner shaft, which urges a roller track formed by a respective axial groove of the inner shaft and a respective axial groove of the outer shaft with a spring force.

The invention is therefore an object of the invention to provide a steering intermediate shaft for a motor vehicle and a method for operating a steering intermediate shaft for a motor vehicle, which is inexpensive to produce, has a high durability, a low-friction displacement of the inner hollow shaft relative to the outer hollow shaft and an effective power transmission of allows the outer hollow shaft on the inner hollow shaft.

The object is achieved with a steering intermediate shaft for a motor vehicle having the features of patent claim 1. Furthermore, the object is achieved with a method for operating a steering intermediate shaft for a motor vehicle having the features of patent claim 10.

Disclosure of the invention

The present invention provides a steering intermediate shaft for a motor vehicle having an outer hollow shaft, an at least partially disposed in the outer hollow shaft inner hollow shaft, and a plurality of, the inner hollow shaft in the outer hollow shaft leading guide assemblies, wherein the plurality of guide assemblies each one, at a Inner circumference of the outer hollow shaft in a substantially concave first portion, each having a, on an outer circumference of the inner hollow shaft is substantially concave second portion, and each having a guide member which is inserted into a formed between the first portion and the second portion cavity characterized in that the guide element for displacing the inner hollow shaft in the axial direction of the outer hollow shaft and for transmitting a torque acting on the guide element from the outer hollow shaft torque on the inner hollow shaft at least abs Chnittsweise rests against the outer hollow shaft and the inner hollow shaft and is formed substantially rod-shaped.

The present invention further provides a method of operating a steering intermediate shaft for a motor vehicle. The method includes providing an outer hollow shaft. The method further comprises providing an inner hollow shaft at least partially disposed in the outer hollow shaft. The method further comprises providing a plurality of guide assemblies guiding the inner hollow shaft in the outer hollow shaft for displacing the inner hollow shaft in the axial direction of the outer hollow shaft, the plurality of guide assemblies each having a first concave shape substantially concave on an inner circumference of the outer hollow shaft Section, each having a, on an outer circumference of the inner hollow shaft is substantially concave second portion, and each provide a guide member which is inserted in a, formed between the first portion and the second portion cavity.

The method further comprises a displacement of the inner hollow shaft in the axial direction of the outer hollow shaft by means of the guide element. The method further comprises transmitting a torque acting on the guide element from the outer hollow shaft to the inner hollow shaft by providing the substantially rod-shaped guide element, which rests at least partially against the outer hollow shaft and the inner hollow shaft.

An idea of the present invention is to improve a steering intermediate shaft for a motor vehicle in that the displacement of the inner hollow shaft relative to the outer hollow shaft and the power transmission from the outer to the inner hollow shaft by only respective guide elements is made possible, which is a direct connection between outer Create hollow shaft and inner hollow shaft. Thus, it can be dispensed with the provision of a profile wave. Due to the rod-shaped design of the guide elements can be a low-friction displacement of the inner hollow shaft relative to the outer hollow shaft and an effective power transmission from the outer hollow shaft on the inner hollow shaft while ensuring high durability and cost manufacturability of the guide elements are guaranteed. Such an arrangement also meets the requirements for durability of the steering intermediate shaft for use in the field of commercial vehicles.

Advantageous embodiments and further developments emerge from the dependent claims and from the description with reference to the figures.

According to a preferred embodiment, it is provided that the guide element has a substantially cylindrical cross-section, wherein the first portion formed on the inner circumference of the outer hollow shaft and the second concave portion substantially concave on the outer circumference of the inner hollow shaft are formed such that the guide element in the assembled state, the outer hollow shaft of the inner hollow shaft in the radial direction spaced from each other.

By providing the cylindrical cross section of the guide element, a simple displacement of the inner hollow shaft relative to the outer hollow shaft can be made possible. In addition, an effective power transmission from the outer hollow shaft to the inner hollow shaft due to a high contact surface both the outer hollow shaft and the inner hollow shaft can be made possible on the respective guide elements.

According to a further preferred embodiment, it is provided that the guide element has a steel core with a plastic coating, wherein the plastic coating of the guide element is preferably formed of polyester. By providing the plastic coating, the inner hollow shaft can be moved axially relative to the outer hollow shaft very low friction. The steel core of the guide element advantageously has a high strength and thus a long service life.

According to a further preferred development, it is provided that the plastic coating of the guide element can be compressed in the thickness direction when the torque acting on the guide element from the outer hollow shaft is applied. Due to the compressibility of the plastic coating, a continuous, smooth torque transmission from the outer hollow shaft to the inner hollow shaft can be ensured.

According to a further preferred refinement, it is provided that the plastic coating of the guide element is designed so elastically that a play compensation of the respective guide arrangement can be provided by means of the plastic coating of the guide element. The provision of the plastic coating in this case has the advantage that it has a spring effect and thus an effective, continuous clearance compensation can take place.

According to a further preferred development, it is provided that the second section, which is essentially concave on the outer circumference of the inner hollow shaft, has an axial length which substantially corresponds to a length of the guide element. Thus, the guide element can be accommodated in the substantially concave second section of the inner hollow shaft in such a way that it is substantially fixed in the axial direction. Thus, advantageously, a simple displaceability of the inner hollow shaft relative to the outer hollow shaft and an effective transmission of the torque from the outer hollow shaft to the inner hollow shaft can be achieved.

According to a further preferred embodiment, it is provided that the outer hollow shaft and the inner hollow shaft have a concentric cylindrical cross-section. The fact that the profiled shaft is not necessary in the present invention, which usually has an eccentric cylindrical cross section, a simple and inexpensive manufacturable form of the outer hollow shaft and the inner hollow shaft can be made possible.

According to a further preferred development, it is provided that the axial length of the guide element is between 30 mm and 60 mm, preferably between 45 mm and 60 mm. This relatively short length allows low-friction displacement of the inner hollow shaft in the outer hollow shaft with simultaneous effective torque transmission from the outer hollow shaft to the inner hollow shaft and good durability of the guide elements.

According to a further preferred development, it is provided that the outer hollow shaft has a plurality of cutouts on the inner circumference, wherein a respective cutout is arranged between the respective first sections, which are essentially concave on the inner circumference of the outer hollow shaft. The provision of these additional cutouts advantageously allows a further weight saving of the steering intermediate shaft.

The described embodiments and developments can be combined with each other as desired.

Further possible refinements, developments and implementations of the invention also include combinations, not explicitly mentioned, of features of the invention described above or below with regard to the exemplary embodiments.

Brief description of the drawings

The accompanying drawings are intended to provide further understanding of the embodiments of the invention. They illustrate embodiments and, together with the description, serve to explain principles and concepts of the invention.

Other embodiments and many of the stated advantages will become apparent with reference to the drawings. The illustrated elements of the drawings are not necessarily shown to scale to each other.

Show it:

1 a schematic representation of a steering intermediate shaft for a motor vehicle according to a preferred embodiment of the invention;

2 a cross-sectional view of the steering intermediate shaft for a motor vehicle according to the preferred embodiment of the invention;

3 an exploded view of the steering intermediate shaft for a motor vehicle according to the preferred embodiment of the invention;

4 a longitudinal sectional view of an inserted into an inner hollow shaft guide member according to the preferred embodiment of the invention; and

5 a flowchart of a method for operating a steering intermediate shaft for a motor vehicle according to the preferred embodiment of the invention.

In the figures of the drawings, like reference characters designate like or functionally identical elements, components or components unless otherwise indicated.

1 shows a schematic representation of a steering intermediate shaft for a motor vehicle according to a preferred embodiment of the invention.

The steering intermediate shaft 1 for a motor vehicle has an outer hollow shaft 10 and one in the outer hollow shaft 10 displaceably arranged inner hollow shaft 12 on. The steering intermediate shaft 1 is at a first end with a first universal joint 61 and at a second end with a second ball joint 62 connected. The steering intermediate shaft 1 is based on a starting position telescopically extendable and shortened to compensate for occurring during a driving operation of the motor vehicle relative movements between a driver's cab and a chassis such that they remain without affecting the steering behavior of the vehicle. The steering intermediate shaft 1 Furthermore, at one end of the outer hollow shaft 10 on which the inner hollow shaft 12 from the outer hollow shaft 10 exit, a scraper 63 which preferably has a seal.

In a caused by a rotational movement of the steering column of the motor vehicle rotation of the outer hollow shaft 10 thus finds a transmission of torque to the inner hollow shaft 12 and from this to a steering gear of the motor vehicle instead.

2 shows a cross-sectional view of the steering intermediate shaft for a motor vehicle according to the preferred embodiment of the invention.

In the present illustration, the inner hollow shaft 12 in the outer hollow shaft 10 inserted. The steering intermediate shaft 1 further includes a plurality of, the inner hollow shaft 12 in the outer hollow shaft 10 leading management orders 15 . 25 . 35 on.

A first leadership arrangement 15 preferably has one, on an inner circumference 10a the outer hollow shaft 10 essentially concave first section 16 on. Furthermore, the first guide arrangement 15 one, on an outer circumference 12a the inner hollow shaft 12 essentially concave second section 17 on. Moreover, the first guide arrangement 15 a guide element 18 on which, in one, between the first section 16 and the second section 17 trained cavity 19 is inserted.

The guide element 18 lies to move the inner hollow shaft 12 in the axial direction of the outer hollow shaft 10 and for transmitting one of the outer hollow shaft 10 on the guide element 18 acting torque on the inner hollow shaft 12 on the outer hollow shaft 10 and the inner hollow shaft 12 preferably. Alternatively, the guide element 18 for example, only in sections on the outer hollow shaft and the inner hollow shaft 12 issue.

The guide element 18 is preferably formed substantially rod-shaped. Alternatively, the guide element 18 have another suitable shape. The guide element 18 has preferably a substantially cylindrical cross section. The inner circumference 10a the outer hollow shaft 10 essentially concave first section 16 and the outer circumference 12a the inner hollow shaft 12 essentially concave second section 17 are preferably designed such that the guide element 18 in the assembled state, the outer hollow shaft 10 from the inner hollow shaft 12 spaced apart in the radial direction.

The guide element 18 preferably has a steel core 18a with a plastic coating 18b on, with the plastic coating 18b of the guide element 18 is preferably formed of polyester. Alternatively, the plastic coating 18b of the guide element 18 be formed from another suitable plastic.

The plastic coating 18b of the guide element 18 is at concern of the of the outer hollow shaft 10 on the guide element 18 acting torque preferably compressible in the thickness direction. The plastic coating 18b of the guide element 18 is further preferably designed so elastic that by means of the plastic coating 18b of the guide element 18 a clearance compensation of the first guide arrangement 15 is available.

A second guide arrangement 25 preferably has one, on an inner circumference 10a the outer hollow shaft 10 essentially concave first section 26 on. Furthermore, the second guide arrangement 25 one, on an outer circumference 12a the inner hollow shaft 12 essentially concave second section 27 on. Moreover, the second guide arrangement 25 a guide element 28 on which, in one, between the first section 26 and the second section 27 trained cavity 29 is inserted.

The guide element 28 lies to move the inner hollow shaft 12 in the axial direction of the outer hollow shaft 10 and for transmitting one of the outer hollow shaft 10 on the guide element 28 acting torque on the inner hollow shaft 12 on the outer hollow shaft 10 and the inner hollow shaft 12 preferably. Alternatively, the guide element 28 for example, only in sections on the outer hollow shaft and the inner hollow shaft 12 issue.

The guide element 28 is preferably formed substantially rod-shaped. Alternatively, the guide element 28 have another suitable shape. The guide element 28 preferably has a substantially cylindrical cross-section. The inner circumference 10a the outer hollow shaft 10 essentially concave first section 26 and the outer circumference 12a the inner hollow shaft 12 essentially concave second section 27 are preferably designed such that the guide element 28 in the assembled state, the outer hollow shaft 10 from the inner hollow shaft 12 spaced apart in the radial direction.

The guide element 28 preferably has a steel core 28a with a plastic coating 28b on, with the plastic coating 28b of the guide element 28 is preferably formed of polyester. Alternatively, the plastic coating 28b of the guide element 28 be formed from another suitable plastic.

The plastic coating 28b of the guide element 28 is at concern of the of the outer hollow shaft 10 on the guide element 28 acting torque preferably compressible in the thickness direction. The plastic coating 28b of the guide element 28 is further preferably designed so elastic that by means of the plastic coating 28b of the guide element 28 a clearance compensation of the second guide assembly 25 is available.

A third leadership arrangement 35 preferably has one, on an inner circumference 10a the outer hollow shaft 10 essentially concave first section 36 on. Furthermore, the third guide arrangement 35 one, on an outer circumference 12a the inner hollow shaft 12 essentially concave second section 37 on. Moreover, the third guide arrangement 35 a guide element 38 on which, in one, between the first section 36 and the second section 37 trained cavity 39 is inserted.

The guide element 38 lies to move the inner hollow shaft 12 in the axial direction of the outer hollow shaft 10 and for transmitting one of the outer hollow shaft 10 on the guide element 38 acting torque on the inner hollow shaft 12 on the outer hollow shaft 10 and the inner hollow shaft 12 preferably. Alternatively, the guide element 38 for example, only in sections on the outer hollow shaft and the inner hollow shaft 12 issue.

The guide element 38 is preferably formed substantially rod-shaped. Alternatively, the guide element 38 have another suitable shape. The guide element 38 preferably has a substantially cylindrical cross-section. The inner circumference 10a the outer hollow shaft 10 essentially concave first section 36 and the outer circumference 12a the inner hollow shaft 12 essentially concave second section 37 are preferably designed such that the guide element 38 in the assembled state, the outer hollow shaft 10 from the inner hollow shaft 12 spaced apart in the radial direction.

The guide element 38 preferably has a steel core 38a with a plastic coating 38b on, with the plastic coating 38b of the guide element 38 is preferably formed of polyester. Alternatively, the plastic coating 38b of the guide element 38 be formed from another suitable plastic. The plastic coating 38b of the guide element 38 is at concern of the of the outer hollow shaft 10 on the guide element 38 acting torque preferably compressible in the thickness direction. The plastic coating 38b of the guide element 38 is further preferably designed so elastic that by means of the plastic coating 38b of the guide element 38 a clearance compensation of the third leadership arrangement 35 is available.

The outer hollow shaft 10 and the inner hollow shaft 12 preferably have a concentric cylindrical cross-section. Alternatively, the outer hollow shaft 10 and the inner hollow shaft 12 for example, have another suitable cross-section. The inner hollow shaft 10 preferably has on the inner circumference 10a a plurality of cutouts 20 . 30 . 40 on, with a respective section 20 . 30 . 40 between the respective, on the inner circumference 10a the outer hollow shaft 10 essentially concave first sections 16 . 26 . 36 is arranged. Alternatively, the plurality of cutouts 20 . 30 . 40 also at another suitable place on the inner circumference 10a the outer hollow shaft 10 be arranged. Similarly, a number of the cutouts 20 . 30 . 40 vary in an advantageous manner depending on the requirements.

3 shows an exploded view of the steering intermediate shaft for a motor vehicle according to the preferred embodiment of the invention. The respective guide elements 18 . 28 . 38 are in an advantageous manner in the outer periphery 12a the inner hollow shaft formed first sections 16 . 26 . 36 insertable. In the present illustration, the outer circumference 12a the hollow shaft 12 essentially concave second section 17 . 27 . 37 an axial length L1 which is greater than a length L2 of the guide elements 18 . 28 . 38 is.

This difference in length is for illustrative purposes only. According to the preferred embodiment, this corresponds to the outer circumference 12a the inner hollow shaft 12 essentially concave second section 17 . 27 . 37 in its axial length L1 of the length L2 of the respective guide elements 18 . 28 . 38 , The axial length L2 of the respective guide elements 18 . 28 . 38 is 50 mm in the preferred embodiment. Alternatively, the axial length L2 of the guide elements 18 . 28 . 38 for example, another suitable length in the range of 30 to 60 mm, preferably in the range of 45 to 60 mm.

4 shows a longitudinal sectional view of an inserted into an inner hollow shaft guide member according to the preferred embodiment of the invention.

That in the substantially concave second section 37 the inner hollow shaft 12 inserted guide element 38 is preferably fitting in the second section 37 inserted. A game between the guide element 38 and the adjacent inner hollow shaft 12 is preferably 0.1 mm. A game of the guide element 38 to the adjacently arranged outer hollow shaft 10 is also preferably 0.1 mm. Alternatively, the respective game of the guide element 38 to the inner hollow shaft 12 and to the outer hollow shaft 10 have another suitable measure.

5 shows a flowchart of a method for operating a steering intermediate shaft for a motor vehicle according to the preferred embodiment of the invention.

The method for operating an intermediate steering shaft for a motor vehicle comprises providing S1 of an outer hollow shaft. The method further comprises providing S2 an inner hollow shaft arranged at least partially in the outer hollow shaft. The method further comprises providing S3 a plurality of guide assemblies guiding the inner hollow shaft in the outer hollow shaft for displacing the inner hollow shaft in the axial direction of the outer hollow shaft, the plurality of guide assemblies each having a substantially concave shape on an inner circumference of the outer hollow shaft first portion, each one, on a outer circumference of the inner hollow shaft is substantially concave second portion, and each provide a guide member which is inserted in a, formed between the first portion and the second portion cavity.

The method further comprises a displacement S4 of the inner hollow shaft in the axial direction of the outer hollow shaft by means of the guide element. The method further comprises transmitting S5 of a torque acting on the guide member from the outer hollow shaft to the inner hollow shaft by providing the in Essentially rod-shaped guide element, which abuts at least partially on the outer hollow shaft and the inner hollow shaft.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto but is modifiable in a variety of ways. In particular, the invention can be varied or modified in many ways without deviating from the gist of the invention.

For example, a shape, dimension and / or a processing or manufacturing process of the components of the intermediate steering shaft can be changed.

LIST OF REFERENCE NUMBERS

1

Intermediate steering shaft

10

outer hollow shaft

10a

Inner circumference of the outer hollow shaft

12

inner hollow shaft

12a

Outer circumference of the inner hollow shaft

15

first leadership arrangement

25

second management arrangement

35

third leadership arrangement

16, 26, 36

first section

17, 27, 37

second part

18, 28, 38

guide element

19, 29, 39

cavity

18a, 28a, 38a

steel core

18b, 28b, 38b

Plastic coating

20, 30, 40

cutouts

L1, L2

length

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• US 2011/0098121 A1 [0003]

Claims (10)

Steering intermediate shaft ( 1 ) for a motor vehicle, comprising: an outer hollow shaft ( 10 ); one at least partially in the outer hollow shaft ( 10 ) arranged inner hollow shaft ( 12 ); and a plurality of, the inner hollow shaft ( 12 ) in the outer hollow shaft ( 10 ) leading management orders ( 15 . 25 . 35 ), wherein the plurality of guide assemblies ( 15 . 25 . 35 ) one each, on an inner circumference ( 10a ) of the outer hollow shaft ( 10 ) in a substantially concave first section ( 16 . 26 . 36 ), one each, on an outer periphery ( 12a ) of the inner hollow shaft ( 12 ) substantially concaved second section ( 17 . 27 . 37 ), and in each case a guide element ( 18 . 28 . 38 ), which in one, between the first section ( 16 . 26 . 36 ) and the second section ( 17 . 27 . 37 ) formed cavity ( 19 . 29 . 39 ), characterized in that the guide element ( 18 . 28 . 38 ) for moving the inner hollow shaft ( 12 ) in the axial direction of the outer hollow shaft ( 10 ) and for transmitting one of the outer hollow shaft ( 10 ) on the guide element ( 18 . 28 . 38 ) acting torque on the inner hollow shaft ( 12 ) at least in sections on the outer hollow shaft ( 10 ) and the inner hollow shaft ( 12 ) is applied and is substantially rod-shaped. Steering intermediate shaft according to claim 1, characterized in that the guide element ( 18 . 28 . 38 ) has a substantially cylindrical cross-section, wherein the inner circumference ( 10a ) of the outer hollow shaft ( 10 ) substantially concaved first section ( 16 . 26 . 36 ) and the outer circumference ( 12a ) of the inner hollow shaft ( 12 ) substantially concaved second section ( 17 . 27 . 37 ) are formed such that the guide element ( 18 . 28 . 38 ) in the mounted state, the outer hollow shaft ( 10 ) of the inner hollow shaft ( 12 ) are spaced apart in the radial direction. Steering intermediate shaft according to claim 1 or 2, characterized in that the guide element ( 18 . 28 . 38 ) a steel core ( 18a . 28a . 38a ) with a plastic coating ( 18b . 28b . 38b ), wherein the plastic coating ( 18b . 28b . 38b ) of the guide element ( 18 . 28 . 38 ) is preferably formed of polyester. Steering intermediate shaft according to claim 3, characterized in that the plastic coating ( 18b . 28b . 38b ) of the guide element ( 18 . 28 . 38 ) in case of concern of the outer hollow shaft ( 10 ) on the guide element ( 18 . 28 . 38 ) acting torque in the thickness direction is compressible. Steering intermediate shaft according to claim 3 or 4, characterized in that the plastic coating ( 18b . 28b . 38b ) of the guide element ( 18 . 28 . 38 ) is formed so elastically that by means of the plastic coating ( 18b . 28b . 38b ) of the guide element ( 18 . 28 . 38 ) a clearance compensation of the respective leadership order ( 15 . 25 . 35 ) is available. Steering intermediate shaft according to one of the preceding claims, characterized in that on the outer circumference ( 12a ) of the inner hollow shaft ( 12 ) substantially concaved second section ( 17 . 27 . 37 ) has an axial length (L1) substantially equal to a length (L2) of the guide element (L1) 18 . 28 . 38 ) corresponds. Steering intermediate shaft according to one of the preceding claims, characterized in that the outer hollow shaft ( 10 ) and the inner hollow shaft ( 12 ) have a concentric cylindrical cross-section. Steering intermediate shaft according to one of the preceding claims, characterized in that the axial length (L2) of the guide element ( 18 . 28 . 38 ) is between 30mm and 60mm, preferably between 45mm and 60mm. Steering intermediate shaft according to one of the preceding claims, characterized in that the outer hollow shaft ( 10 ) on the inner circumference ( 10a ) a plurality of cutouts ( 20 . 30 . 40 ), wherein a respective section ( 20 . 30 . 40 ) between the respective, on the inner circumference ( 10a ) of the outer hollow shaft ( 10 ) substantially concave first sections ( 16 . 26 . 36 ) is arranged. Method for operating an intermediate steering shaft for a motor vehicle, comprising the steps of: providing (S1) an outer hollow shaft ( 10 ); Providing (S2) an at least partially in the outer hollow shaft ( 10 ) arranged inner hollow shaft ( 12 ); Providing (S3) a plurality of, the inner hollow shaft ( 12 ) in the outer hollow shaft ( 10 ) leading management orders ( 15 . 25 . 35 ) for moving the inner hollow shaft ( 12 ) in the axial direction of the outer hollow shaft ( 10 ), wherein the plurality of guide assemblies ( 15 . 25 . 35 ) one each, on an inner circumference ( 10a ) of the outer hollow shaft ( 10 ) in a substantially concave first section ( 16 . 26 . 36 ), one each, on an outer periphery ( 12a ) of the inner hollow shaft ( 12 ) substantially concaved second section ( 17 . 27 . 37 ), and in each case a guide element ( 18 . 28 . 38 ), which in one, between the first section ( 16 . 26 . 36 ) and the second section ( 17 . 27 . 37 ) formed cavity ( 19 . 29 . 39 ), characterized by: Shifting (S4) of the inner hollow shaft ( 12 ) in the axial direction of the outer hollow shaft ( 10 ) by means of the guide element ( 18 . 28 . 38 ); and transmitting (S5) one of the outer hollow shaft ( 10 ) on the guide element ( 18 . 28 . 38 ) acting torque on the inner hollow shaft ( 12 ) by providing the substantially rod-shaped guide element ( 18 . 28 . 38 ), which at least partially on the outer hollow shaft ( 10 ) and the inner hollow shaft ( 12 ) is present.

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