DE102016118116B4 - Method for producing a connection of a rotary shaft with a rotary element and corresponding arrangement - Google Patents

Abstract

Method for producing a connection of a rotary shaft (10) to a force-transmitting rotary element (12), preferably a bevel gear, the method comprising the following steps: a) forging the rotary shaft (10) and the rotary element (12), wherein the rotary element (12) b) pressing the rotary shaft (10) into the opening (12.1) of the rotary element (12) such that a first lead-in area (10.2) of the rotary shaft (10) into a second Insertion region (12.2) of the rotary member (12) is inserted; wherein step a) is performed such that an axial extent of the insertion portion (12.2) of the rotary member (12) coincides with an axial extent of the aperture (12.1), and wherein the rotary shaft (10) and the rotary member (12) form and non-positively connected axially fixed to each other in the axial direction.

Description

The invention relates to a method for producing a connection of a rotary shaft with a force-transmitting rotary member, preferably a bevel gear, and an arrangement of a rotary shaft and a force-transmitting rotary member.

Connections for transmitting rotational movements and torques between rotary shafts whose axes of rotation are not parallel, i. are inclined to each other, are often used in mechanical engineering. In particular from the automotive sector bevel gear or hypoid gear sets are known which are used for transmitting a motor rotary motion to the drive wheels. The manufacturing costs of such compounds are high, not least because of the high cost of materials and the complexity of the manufacturing processes.

From the DE 10 2012 223 870 A1 is a bevel gear assembly for a bevel gear with a bevel gear and a bevel gear connected to the bevel gear shaft known, both bevel gear and bevel gear shaft are hollow. Thus, the cost of materials of this arrangement is reduced compared to arrangements made in full construction. The bevel gear of the known bevel gear arrangement, however, has a cavity which, in an axial end region, has a longitudinal-sectional inner contour which is aligned with the toothing bevel. One consequence of this is that the bevel gear shaft extends only partially into the cavity, reducing a contact area available for transmitting power between the bevel gear shaft and the bevel gear.

In the JP 2007 205 365 A are disclosed a rotary shaft and a rotary member, wherein the rotary shaft is inserted into an opening of the rotary member and abuts with its end face to a bottom or bottom of the opening of the rotary member.

The citation DE 11 2005 000 616 T5 discloses a rotary element in the form of a gear and a rotary shaft in the form of a shaft. In addition, the gear may be formed in a forging process. In this case, the shaft protrudes into an opening of the gear, wherein at an interface there is an interference fit, namely between a coupling means and a shaft section.

In the citation DE 10 2004 036 611 A1 is disclosed a hinge connection of a first component with a second component by means of toothing.

The invention has for its object to further develop the production of a compound of a rotary shaft with a force-transmitting rotary member, preferably a bevel gear, in terms of improved power transmission and manufacturing and provide a corresponding connection.

This object is solved by the subject matter of the independent claims. Advantageous embodiments and further developments are specified in the dependent claims. The features of the developments can, as far as technically feasible, be combined.

1. a) Schmieden der Rotationswelle und des Rotationselements, wobei das Rotationselement eine Öffnung zum Aufnehmen der Rotationswelle aufweist;
2. b) Pressen der Rotationswelle in die Öffnung des Rotationselements derart, dass ein erster Einführbereich der Rotationswelle in einen zweiten Einführbereich des Rotationselements eingeführt wird.

One aspect of the invention relates to a method for producing a connection of a rotary shaft with a force-transmitting rotary element, preferably a bevel gear or possibly a gear. The method comprises the following steps:

1. a) forging the rotary shaft and the rotary member, the rotary member having an opening for receiving the rotary shaft;
2. b) pressing the rotation shaft into the opening of the rotation member such that a first insertion portion of the rotation shaft is inserted into a second insertion portion of the rotation member.

Forging includes all known types of forging, such as cold forging, hot forging or hot forging. The insertion area is synonymous with a penetration area.

The step a) is carried out such that a length or axial extent of the second insertion region of the rotary element coincides with a length or axial extent of the opening.

That is, the rotary shaft is fully inserted into the opening of the rotary member until it stops. Preferably, the rotary shaft is thus inserted as far as an axial end of the opening on which there is an end element of the rotation element, so that the opening or the cavity of the rotation element is filled over its entire length or axial extent by a corresponding part of the rotation shaft.

Another aspect of the invention relates to an arrangement of a rotary shaft and a force-transmitting rotary member, preferably a bevel gear.

• - das Rotationselement weist eine Öffnung zum Aufnehmen der Rotationswelle auf;
• - ein erster Einführbereich der Rotationswelle ist in einen zweiten Einführbereich des Rotationselements eingeführt;
• - eine Länge oder axiale Ausdehnung des zweiten Einführbereichs des Rotationselements stimmt mit einer Länge oder axialen Ausdehnung der Öffnung des Rotationselements überein.

The arrangement comprises the following features:

• - the rotation member has an opening for receiving the rotation shaft;
• a first insertion portion of the rotary shaft is inserted in a second insertion portion of the rotary member;
• a length or axial extent of the second insertion region of the rotation element coincides with a length or axial extent of the opening of the rotation element.

The first insertion portion of the rotation shaft means a portion of the rotation shaft, more specifically, a portion of an outer surface of the rotation shaft, preferably an axial portion of the rotation shaft which is in contact with the rotation member in a state of the rotation shaft inserted into the rotation member.

The second insertion portion of the rotation member designates a portion of the rotation member, particularly, a portion of an inner surface of the rotation member, preferably an axial portion of the rotation member which is in contact with the rotation shaft in a state of the rotation shaft inserted into the rotation member.

Rotary shaft and rotary member, or first insertion of the rotary shaft and second insertion of the rotary member may be shaped such that rotary shaft and rotary member according to the invention in the axial direction positively and non-positively connected to each other and in particular in the azimuthal direction positively and / or non-positively connected to each other. Thus rotational shaft and rotation element according to the invention can be axially fixed and preferably non-rotatably connected or be.

The introduction of the rotary shaft over the entire length of the cavity or the opening of the rotary member allows a very effective utilization of the available geometry of the rotary member for a power transmission between the rotary shaft and rotary member. Compared to known compounds in which the bevel gear shaft does not extend to the inner end side of the cavity, this advantageously allows a connection between the rotation shaft and the rotation element, which allows transmission of higher torques.

The step a) may be carried out such that an outer surface of the rotary shaft has an excess over an inner surface of the rotary member, at least in the lead-in areas, preferably for producing an axial permanent press connection between the rotary shaft and the rotary member having a peel strength greater than 50, 60 or 70 KN, wherein in particular no particular only for fixing the rotary member on the rotary shaft certain press connection is made.

The excess between the outer surface of the rotary shaft and the inner surface of the rotary member means that an outer radius of the rotary shaft or radius of the outer surface of the rotary shaft is at least partially larger than an inner radius of the rotary member or a radius of the inner surface of the rotary member. If the outer contour of the rotation shaft, at least in the insertion areas, is not circular, "oversize" means that the outer surface of the rotation shaft is larger than the contour of the inner surface of the rotation element which may be partially adapted to the outer contour of the rotation shaft.

The oversize can be generated by the fact that the outer surface of the rotary shaft has at least two, three or six fixing elements, which are formed as elevations of the outer surface of the rotary shaft, in particular as elongate structures in an axial direction of the rotary shaft, wherein preferably a material hardness of the fixing elements is greater than a material hardness of the inner surface of the rotary member.

The respective fixing elements may preferably have the same parameters and / or be arranged equidistant from each other, in particular in the azimuthal direction, i. along a circumference of the rotary shaft. Thus, the rotation shaft can be better centered when inserting the rotary shaft in the rotation element, so that the resulting rotary body is largely unbalance.

The elevations of the outer surface of the rotary shaft may optionally be formed as Außenrändel. However, fixing elements have the advantage over Außenrändeln to form a clearer, stronger and more pronounced toothing between the rotary shaft and the rotary member in an introduced into the rotary member state of the rotary shaft and thus to allow transmission of higher torques. The elevations have a relative to the radius of the rotary shaft by about 2-10%, preferably 5-8% enlarged radius.

According to a further embodiment, the rotary shaft, at least in the first insertion region, have a cross section with a rotationally asymmetric outer contour. Preferably, a rotationally asymmetric outer contour is polygonal or at least not circular or part-circular, eg part-circular with grooves or grooves, which are arranged regularly or irregularly between the pitch circle sections. In order to Rotary shaft and rotational element in the azimuthal and / or axial direction positively and / or non-positively, preferably non-rotatably and / or axially fixed to each other.

A rotational shaft with rotationally asymmetric cross-sectional outer contour allows an advantageous, preferably as a toothing, positive and / or non-positive connection between the rotary shaft and rotation element, whereby even higher torques can be transmitted.

According to one embodiment, the rotary shaft can be produced as a hollow shaft, wherein the rotary shaft is hollow over its entire axial extent, or only in regions. In this case, the rotary shaft i) hollow forged or ii) fully forged and hollow drilled. The rotary shaft can also be made by means of iii) cupping or cup extrusion, or iv) by means of a combination of cupping and drilling. In this case, the step a) may be performed such that the first insertion portion of the rotary shaft is closed with the end member of the rotary member in an axial direction, so that the rotary shaft extends over the entire axial extent of the opening of the rotary member. Thus, the rotation shaft and the rotation element have no common cavity.

One, at least partially, hollow rotary shaft can be advantageously produced with less material and thus more cost-effective than a solid shaft.

• - die äußere axiale Ausdehnung der Rotationswelle 10 beträgt 160 bis 180 mm, bevorzugt etwa 169 mm;
• - die innere axiale Ausdehnung der Rotationswelle 10 (Länge des Hohlraums 10.1 der Rotationswelle 10) beträgt 125 bis 145 mm, bevorzugt etwa 135 mm;
• - der Außendurchmesser der Rotationswelle 10 in einem axialen Bereich nahe zum Rotationselement 12 beträgt 33 bis 53 mm, bevorzugt etwa 42,8 mm;
• - der Innendurchmesser der Rotationswelle 10 in einem axialen Bereich nahe zum Rotationselement 12 beträgt 18 bis 38 mm, bevorzugt etwa 28 mm;
• - der maximale Außendurchmesser des Rotationselements 12 beträgt 100 bis 120 mm, bevorzugt etwa 109 mm.

A preferred embodiment has the following dimensions:

• - The outer axial extent of the rotary shaft 10 is 160 to 180 mm, preferably about 169 mm;
• - The inner axial extent of the rotary shaft 10 (Length of the cavity 10.1 the rotary shaft 10 ) is 125 to 145 mm, preferably about 135 mm;
• - The outer diameter of the rotary shaft 10 in an axial region close to the rotation element 12 is 33 to 53 mm, preferably about 42.8 mm;
• - The inner diameter of the rotary shaft 10 in an axial region close to the rotation element 12 is 18 to 38 mm, preferably about 28 mm;
• - The maximum outer diameter of the rotary member 12 is 100 to 120 mm, preferably about 109 mm.

• 1 eine Seitenansicht der Rotationswelle 10 und des Rotationselements 12, wobei das Rotationselement 12 an einem axialen Ende 12.7 mit einem Stirnelement 12.8 abgeschlossen ist, vor der Ausführung des Schritts b),
• 2a eine Seitenansicht der Anordnung von Rotationswelle 10 und Rotationselement 12,
• 2b einen Schnitt B-B der Anordnung aus 2a, und
• 3 eine perspektivische Ansicht der Anordnung von Rotationswelle 10 und Rotationselement 12.

The invention will be explained in more detail by means of embodiments and with reference to the drawings. The same reference numbers refer to the same or corresponding elements. The features of various embodiments may be combined. Show it:

• 1 a side view of the rotary shaft 10 and the rotation element 12 , wherein the rotation element 12 at an axial end 12.7 with a front element 12.8 completed before the execution of step b),
• 2a a side view of the arrangement of rotary shaft 10 and rotation element 12 .
• 2 B a section BB of the arrangement 2a , and
• 3 a perspective view of the arrangement of rotary shaft 10 and rotation element 12 ,

1 shows a side view of the rotary shaft 10 and the rotation element 12 , which are made by forging. The rotation element 12 includes an opening 12.1 for receiving the rotary shaft 10 and a cavity or the rotary shaft comprises a cavity 10.1 , The rotation element 12 is at an axial end 12.7 with a front element 12.8 completed. The step b) of the manufacturing process has not yet been carried out, so that the rotation shaft 10 and the rotation element 12 are separated from each other.

A first introduction area 10.2 the rotary shaft 10 denotes a portion of an outer surface of the rotary shaft 10 who is in an in 2a shown in the rotation element 12 introduced state of the rotary shaft 10 in contact with the rotating element 12 ,

A second introduction area 12.2 of the rotary element 12 denotes a portion of an inner surface of the rotary member 12 who is in an in 2a shown in the rotation element 12 introduced state of the rotary shaft 10 in contact with the rotary shaft 10 ,

A force F gets on the rotation shaft 10 exerted to press the rotary shaft 10 in the opening 12.1 of the rotary element 12 ,

2a shows a side view of the arrangement of rotary shaft 10 and rotation element 12 after the rotation shaft 10 in the opening 12.1 of the rotary element 12 was introduced so that a first insertion area 10.2 the rotary shaft 10 in a second insertion area 12.2 of the rotary element 12 was introduced.

The rotation shaft 10 and the rotation element 12 are made such that a length or axial extent of the second insertion region 12.2 of the rotary member having a length or axial extent of the opening 12.1 matches. This will cause the rotation shaft 10 to an axial end of the opening 12.1 inserted, in which a front element 12.8 of the rotary element 12 located so that the opening 12.1 of the rotary element 12 over its entire length or axial extent through a corresponding part of the rotary shaft 10 is completed.

In 2a is an azimuthal circumferential recess 12.5 recognizable, on a lateral end face of the rotary member 12 is formed by forging. It is primarily used for weight savings, but also has another beneficial effect:

Once the rotation shaft has been introduced into the rotating element according to one of the above-described methods, the edge can 12.9 between recess 12.5 and rotary shaft 10 be caulked, ie it is caulked with a suitable tool in the direction of the surface of the rotary member, ie deformed, beaded or folded so that it engages there. This improves the axial pull-off strength of the rotary shaft. Advantageously, the rotary shaft at this point has a smaller diameter than in the first insertion, so that the caulking takes place in this groove, to a corresponding edge or recess.

Here is also an axial recess 12.6 on an outside of the Stirnelements 12.8 recognizable. This is used for clamping in a lathe.

2 B shows a section BB of the arrangement 2a , Here it can be seen that the cross-sectional outer contour 10.3 the rotary shaft 10 three indentations 12.4 having, on the one hand for pressing the rotary shaft 10 in the opening 12.1 of the rotary element 12 serve, on the other hand, as a kind of gearing between rotation shaft 10 and rotation element 12 , whereby a transmission of higher torques by the connection of rotary shaft 10 and rotation element 12 is possible.

In the azimuthal space between the indentations 12.4 are elevations of the outer contour 10.3 , which can be understood as fixing elements whose material hardness is greater than a material hardness of the inner surface of the rotary element. Thus, an excess between the outer surface of the rotary shaft and the inner surface of the rotary member can be formed. However, many other shapes of the outer surface of the rotation shaft or the inner surface of the rotation element are conceivable, for example, triangular, quadrangular, polygonal, polygonal, elliptical or arbitrarily curvy. In this case, it is advantageous to form the material of the rotary element harder than the material of the opposite partner, so that a partner with the outer contours or inner contours pushes into the other partner and permanently deforms the material there.

3 shows a completed arrangement of rotary shaft 10 and rotation element 12 in a perspective view.

Preferably, the manufacturing method or the arrangement of rotary shaft 10 and rotation element 12 one or more of the following features. The features can, if technically feasible, be combined with each other.

The step a) is performed such that an outer surface of the rotary shaft faces an inner surface of the rotary member 12 has an excess, preferably for producing an axial fatigue pressing connection between the rotary shaft 10 and the rotation element 12 with a peel strength greater than 50, 60 or 70 KN, in particular, none merely for fixing the rotary member 12 at the rotary shaft 10 certain press connection is made.

The rotation shaft 10 is made such that the rotation shaft 10 , at least in the first insertion area 10.2 , a cross section with a rotationally asymmetric outer contour 10.3 Has.

The rotation shaft 10 is manufactured such that the cross-sectional outer contour 10.3 the rotary shaft 10 , at least in the first insertion area 10.2 i) is not circular or ii) is polygonal.

The rotation shaft 10 is, at least partially, produced as a hollow shaft.

The rotation shaft 10 i) is hollow forged or ii) fully forged and hollow drilled.

The rotation shaft 10 is made by means of iii) cupping or cup extrusion, or iv) by means of a combination of cupping and drilling.

The step a) is carried out such that the first insertion area 10.2 the rotary shaft 10 at an axial end 12.7 with the front element 12.8 of the rotary element 12 is completed, the rotation shaft 10 and the rotation element 12 have no common cavity.

The rotation element 12 and the rotary shaft 10 are made of different materials.

The rotation element 12 is made of a material comprising a high strength steel alloy or a case hardening steel.

The rotation shaft 10 is made of a material comprising a low alloy steel, preferably a material having an increased yield strength.

The rotation shaft 10 is made with an axially variable outer radius, preferably the outer radius in the first insertion 10.2 the rotary shaft 10 one opposite the outer radius outside the first insertion area 10.2 different, in particular larger, value.

The production of the rotary shaft 10 and / or the rotation element 12 is performed by cold forging, hot forging or hot forging.

After step a), the step is performed: calibrating the rotation shaft 10 and / or the rotation element 12 ,

At a lateral end face of the rotation element 12 becomes an azimuthal circumferential recess 12.5 formed, preferably by means of forging or machining contrasting method.

An outer surface of the rotary shaft 10 has against an inner surface of the rotary member 12 an excess.

The rotation shaft 10 has, at least in the first introduction area 10.2 , a cross section with a rotationally asymmetric outer contour 10.3 ,

The rotation element 12 is designed as a bevel gear, or optionally a gear.

The rotation shaft 10 and the rotation element 12 are arranged coaxially.

An inner contour 12.3 a cross section of the rotary element 12 has a corresponding shape to the cross-sectional outer contour 10.3 the rotary shaft 10 on, wherein preferably the cross-sectional outer contour 10.3 the rotary shaft 10 exactly or roughly, with the cross-sectional inner contour 12.3 of the rotary element 12 matches, in particular so that the rotation shaft 10 free of play to the rotation element 12 is adjusted.

The cross-sectional outer contour 10.3 the rotary shaft 10 is, at least in the first insertion area 10.2 , i) non-circular or ii) polygonal.

The rotation shaft 10 is hollow, at least in an axial portion.

The cross-sectional outer contour 10.3 the rotary shaft 10 is in an axial region of the rotary shaft 10 outside the first insertion area 10.2 , rotationally symmetric.

The outer surface of the rotary shaft 10 is, at least in the first insertion area 10.2 the rotary shaft 10 by a movement of, to a rotation axis of the rotation shaft 10 generated in parallel, generating lines.

An inner surface of the rotary element 12 is in the second insertion area 12.2 of the rotary element 12 by a movement of, to the axis of rotation of the rotary shaft 10 generated in parallel, generating lines.

The outer cross section of the rotary shaft 10 has at least one first indentation 12.4 on.

The cross-sectional outer contour 10.3 the rotary shaft 10 has at least one second indentation, wherein the second indentation opposite to the first indentation 12.4 has a smaller extent in the radial and / or azimuthal direction.

The rotation element 12 is at an axial, the opening 12.1 opposite, end 12.7 with a front element 12.8 completed.

In order to ensure an improved axial peel strength, in a further step, the edge 12.9 at the rotary shaft 10 facing the end of the rotary element 12 to the rotation shaft 10 caulked. The rotation shaft 10 can either be in the rotation element 12 pressed and additionally caulked to produce a certain peel strength, or the rotary shaft 10 becomes in the rotation element 12 used without compression and only caulking of the edge 12.9 fixed. The caulking is done by means of a tool which the upper edge 12.9 , ie, for example, the edge region of a bevel gear in the direction of wave deformed or beaded / folded. This can be completely circumferential or only partial, that is, at some, eg three places. The number of digits specifies the peel strength and can therefore be adapted to the requirements.

LIST OF REFERENCE NUMBERS

10

rotary shaft

10.1

Cavity of the rotary shaft

10.2

first insertion area of the rotary shaft

10.3

Cross-sectional outer contour of the rotary shaft

10.4

Elevation, fixing element of the rotary shaft

12

rotating member

12.1

Opening of the rotary element

12.2

second insertion region of the rotary element

12.3

Cross-sectional inner contour of the rotary element

12.4

Dent of the rotary shaft

12.5

circumferential recess of the rotary element

12.6

axial recess of the rotary element

12.7

axial end of the rotary element

12.8

End element of the rotary element

12.9

edge

F

pressing force

R

rotational motion

Claims (11)

Method for producing a connection between a rotary shaft (10) and a force-transmitting rotary element (12), preferably a bevel gear, the method comprising the following steps: a) forging the rotary shaft (10) and the rotary member (12), the rotary member (12) having an opening (12.1) for receiving the rotary shaft (10); b) pressing the rotary shaft (10) into the opening (12.1) of the rotary member (12) such that a first lead-in area (10.2) of the rotary shaft (10) is inserted into a second lead-in area (12.2) of the rotary member (12); wherein step a) is performed such that an axial extent of the insertion portion (12.2) of the rotary member (12) coincides with an axial extent of the aperture (12.1), and wherein the rotary shaft (10) and the rotary member (12) form and non-positively connected axially fixed to each other in the axial direction. Method according to Claim 1 characterized by the feature: step a) is carried out in such a way that an outer surface of the rotary shaft (10) is oversized with respect to an inner surface of the rotary element (12), at least in the insertion regions (10.2, 12.2), preferably for producing a Axial permanent compression connection between the rotary shaft (10) and the rotary member (12) with a peel strength greater than 50, 60 or 70 KN, in particular no only for fixing the rotary member (12) on the rotary shaft (10) certain press connection is made. Method according to Claim 1 or 2 characterized by the following feature: the rotary shaft (10) is manufactured in such a way that the cross-sectional outer contour (10.3) of the rotary shaft (10), at least in the first lead-in area (10.2), i) is non-circular or semi-circular or ii) is polygonal. Method according to one of Claims 1 - 3 characterized by at least one of the following features: - the rotary shaft (10) is made, at least in regions, as a hollow shaft; - The rotary shaft (10) is i) hollow forged or ii) fully forged and hollow drilled; the rotary shaft (10) is made by means of iii) cupping or cup extrusion, or iv) by means of a combination of cupping and drilling; the step a) is carried out such that the first insertion region (10.2) of the rotary shaft (10) is closed at one axial end (12.7) with the end element (12.8) of the rotary element (12), the rotary shaft (10) and the Rotary element (12) have no common cavity. Method according to one of Claims 1 - 4 characterized by at least one of the following features: the rotation element (12) and the rotation shaft (10) are made of different materials; the rotation element (12) is made of a material comprising a high-strength steel alloy or a case-hardened steel; - The rotary shaft (10) is made of a material comprising a low-alloy steel, preferably made of a material with an increased yield strength. Method according to one of Claims 1 - 5 characterized by at least one of the following features: - the rotary shaft (10) is made with an axially variable outer radius, preferably the outer radius in the first lead-in area (10.2) of the rotary shaft (10) is opposite the outer radius outside the first lead-in area (10.2) different, in particular larger, value; - The production of the rotary shaft (10) and / or the rotary member (12) is carried out by means of cold forging, hot forging or hot forging; after step a), the step is carried out: calibrating the rotary shaft (10) and / or the rotary element (12); - an azimuthally circumferential recess (12.5) is formed on a lateral end face of the rotary element (12). Arrangement of a rotary shaft (10) and a force-transmitting rotary member (12), the assembly comprising the following features: - the rotary member (12) has an opening (12.1) for receiving the rotary shaft (10); - A first insertion region (10.2) of the rotary shaft (10) is inserted into a second insertion region (12.2) of the rotary member (12); - A length or axial extent of a second insertion region (12.2) of the rotary member (12) coincides with a length or axial extent of the opening (12.1), characterized in that the rotational shaft and the rotational element positively and non-positively connected in the axial direction with each other axially are. Arrangement according to Claim 7 characterized by at least one of the following features: an outer surface of the rotary shaft (10) is oversized with respect to an inner surface of the rotary member (12); - The rotation element (12) is designed as a bevel gear, or optionally a gear; - The rotary shaft (10) and the rotary member (12) are arranged coaxially; - The rotary shaft (10) is, at least in an axial portion, hollow. Arrangement according to Claim 7 or 8th characterized by the feature: - an inner contour (12.3) of a cross-section of the rotary element (12) has a corresponding shape to the cross-sectional outer contour (10.3) of the rotary shaft (10), preferably the cross-sectional outer contour (10.3) of the rotary shaft (10.3) 10), exactly or approximately, coincides with the cross-sectional inner contour (12.3) of the rotary element (12), in particular so that the rotary shaft (10) is adapted without play to the rotary element (12). Arrangement according to one of Claims 7 - 9 characterized by at least one of the following features: - the cross-sectional outer contour (10.3) of the rotary shaft (10) is, at least in the first insertion region (10.2), i) non-circular or ii) polygonal; - The cross-sectional outer contour (10.3) of the rotary shaft (10) has at least a first indentation (12.4); - The cross-sectional outer contour (10.3) of the rotary shaft (10) has at least a second indentation, wherein the second indentation relative to the first indentation (12.4) has a smaller extent in the radial and / or azimuthal direction. Arrangement according to one of Claims 7 - 10 characterized by at least one of the following features: - the cross-sectional outer contour (10.3) of the rotary shaft (10) is rotationally symmetric in an axial region of the rotary shaft (10) outside the first lead-in region (10.2); - The rotation element (12) is closed at an axial, the opening (12.1) opposite the end (12.7) with a front element.

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