DE102012020027A1 - Reciprocating piston internal combustion engine for passenger car, has lever element pivoted at bearing position at crank pin, where one bearing position is designed for supplying lubricant to other bearing position from lubrication mist - Google Patents

Abstract

The reciprocating piston internal combustion engine has a lever element (12) pivoted at a bearing position (14) at the crank pin of a crank shaft. A master rod (16) is pivoted relative to the lever element at another bearing position at the lever element. A link rod (38) is pivoted relative to a regulating shaft at the third and fourth bearing positions (42) for adjustment of the compression ratio. One of the bearing positions is designed for supplying lubricant to the other bearing position from a lubrication mist accommodated in a housing element.

Description

The invention relates to a reciprocating internal combustion engine with at least one variably adjustable compression ratio according to the preamble of patent claim 1.

Such a reciprocating internal combustion engine is the US 2012/0111143 A1 to be known as known. The reciprocating internal combustion engine has at least one variably adjustable compression ratio. For setting the compression ratio, at least one lever element is provided, which is rotatably mounted on at least one first bearing point of a crank pin of a crankshaft of the reciprocating internal combustion engine relative to the crank pin.

The reciprocating internal combustion engine comprises at least one piston of the reciprocating internal combustion engine associated Hauptpleuel, which is rotatably mounted on at least one second bearing point on the lever member relative to the lever member. In addition, at least one Nebenpleuel is provided, which is rotatably mounted on at least one third bearing point on the lever member relative to the lever member and on the other hand rotatably mounted at least a fourth bearing on a rotatable about an axis of rotation control shaft relative to the actuating shaft.

The control shaft of the reciprocating internal combustion engine serves to set the compression ratio. If the control shaft is rotated about its axis of rotation, rotation of the lever element relative to the crank pin and thereby displacement of the piston received in a combustion chamber, in particular a cylinder, relative to the combustion chamber are thereby effected via the secondary connecting rod.

To supply at least one of the bearing with a lubricant, in particular lubricating oil, channels are provided, which extend in the crankshaft, in particular in the crank pin, in the lever member, in Hauptpleuel and in connecting means for coupling the individual components together. Through the channels, the lubricant is guided to the corresponding bearing point, so that the bearing point are supplied directly with so-called pressure lubricant or pressure oil. However, these channels are complex and complicated to manufacture. The supply of lubricant to the Hauptpleuels via a lubricant syringe in the lever element, which also requires consuming and costly to produce channels and / or grooves.

The lubricant supply by pressure lubricant or spray oil also loads a lubricant circuit of the reciprocating internal combustion engine, since a pump for conveying the lubricant in terms of their performance and thus in terms of their external dimensions must be made large. In order to distribute the lubricant from the channels in the corresponding bearing, grooves are also required. In the area of these grooves, a pressure distribution of a hydrodynamic lubricant film is disturbed, so that a bearing capacity of the bearing decreases, which in turn requires large and heavy bearings. In addition, the channels represent weakenings of the corresponding components, which subsequently have to be made heavier in terms of their dimensions and heavier in terms of their weight.

It is therefore an object of the present invention to provide a reciprocating internal combustion engine of the type mentioned, in which a lubricant supply at least one of the bearings is realized in a particularly simple and cost-effective manner.

This object is achieved by a reciprocating internal combustion engine having the features of patent claim 1. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the remaining claims.

In order to provide a reciprocating internal combustion engine, in particular for a motor vehicle specified in the preamble of patent claim 1, in which a lubricant supply at least one of the bearings is realized in a particularly simple and cost-effective manner, it is inventively provided that at least one of the bearings for a supply of the at least one bearing point is designed with lubricant from a lubricant mist, which is accommodated in a surrounding the at least one bearing housing elements of the reciprocating internal combustion engine. This means that the lubricant from the lubricant mist, in particular oil mist, which is present anyway in the housing element is used in order to cool and / or lubricate the at least one bearing point with the lubricant.

Such a lubricant mist is in particular in a so-called crank chamber of the reciprocating internal combustion engine, in which the crankshaft is received at least partially before. Especially at high loads and / or speeds of the reciprocating internal combustion engine or its crankshaft, if any spray nozzles for applying the piston with lubricant, the piston with a relatively large amount Spray lubricant, accumulates plenty of lubricant mist whose lubricant content is used to lubricate the at least one bearing point. As a result, a needs-based supply of at least one bearing point can be realized.

As a result of the supply of at least one bearing point with lubricant from the lubricant mist consuming and costly to produce channels, in particular holes, which extend in the crankshaft, the transverse lever and / or in other components of the reciprocating internal combustion engine can be avoided. As a result, the reciprocating internal combustion engine can be produced in a timely and cost-effective manner.

In addition, the elimination of such channels means that in particular the lever element can be made small and compact in terms of its weight and in terms of its external dimensions, resulting in only a small space requirement and low mass forces. Thus counterweights of the crankshaft can be kept particularly small with the same degree of balance. This also leads to a particularly low total weight of the reciprocating internal combustion engine.

Furthermore, internal forces of the reciprocating internal combustion engine and thus friction losses can be kept particularly low. Another advantage is that by supplying the at least one bearing point with lubricant from the lubricant mist a pump of a lubricant circuit of the reciprocating internal combustion engine is not additionally burdened by a supply of at least one bearing with lubricant. The pump for conveying lubricant can thus be made low or small in terms of their performance and / or their outer dimensions, so that friction losses of the reciprocating internal combustion engine can be kept particularly low.

For a particularly advantageous use of the lubricant from the lubricant mist is provided in a particularly advantageous embodiment of the invention that the at least one bearing point is assigned at least one catch element for capturing the lubricant from the lubricant mist. Advantageously, the catch element comprises at least one recess of a surface of the lever element, d. H. a so-called lubricant catching pocket, which can specifically absorb, for example, lubricant spraying from the crankpin.

Advantageously, at least one guide element, in particular a line element, is provided, by means of which the captured or trapped lubricant is then guided to at least one bearing gap of the at least one bearing point.

Alternatively or additionally, the at least one bearing point comprises a shaft element and a hub element at least partially surrounding the shaft element on the outer peripheral side in the circumferential direction of the shaft element, wherein the hub element and / or the shaft element has at least one chamfer running obliquely to the axial direction of the shaft element. By this chamfer, the hub member or the shaft member is bevelled with respect to the axial direction, whereby the lubricant from the lubricant mist in a rotational movement of the hub member relative to the shaft member or vice versa is drawn into the at least one bearing. As a result, a secure supply of at least one bearing point can be ensured with lubricant.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or in the figures alone can be used not only in the respectively indicated combination but also in other combinations or in isolation, without the scope of To leave invention.

The drawing shows in:

1 a schematic side view of a lever assembly for a reciprocating internal combustion engine, wherein by means of the lever arrangement, a compression ratio of the reciprocating internal combustion engine is variably adjustable;

2 a schematic sectional view of the lever assembly along a in 1 shown section line AA;

3 a fragmentary sectional view of a portion X of the lever assembly in an enlarged view;

4 a schematic sectional view of the lever assembly along a in 1 shown section line BB;

5 a sectional view of a schematic sectional view of the lever assembly in a region Y of the lever assembly in an enlarged view;

6 a schematic side view of the lever assembly;

7 a schematic sectional view of the lever assembly along a in 6 shown section line CC;

8th a schematic side view in another embodiment of the lever assembly;

9 a schematic sectional view of the lever assembly along a in 8th shown section line DD;

10 a schematic side view of another embodiment of the lever assembly; and

11 a schematic sectional view of the lever assembly along a in 10 shown section line EE.

1 shows a lever assembly 10 for a reciprocating internal combustion engine for a motor vehicle, in particular a passenger car. The reciprocating internal combustion engine has at least one variably adjustable compression ratio, which by means of in 1 shown lever arrangement 10 is variably adjustable.

The reciprocating internal combustion engine has at least one combustion chamber in the form of a cylinder whose compression ratio is variably adjustable. The reciprocating internal combustion engine further comprises an in 1 not shown crankshaft through which a provided by the reciprocating internal combustion engine torque from the reciprocating internal combustion engine can be discharged.

The lever arrangement 10 has a lever element in the form of a so-called cross lever 12 on, which at a first depository 14 is rotatably mounted on a crank pin of the crankshaft relative to the crank pin. This includes the first depository 14 a camp recording 15 of the cross lever 12 and outer peripheral side bearing surfaces of the crank pin, which in the circumferential direction of the crank pin at least partially and in the present case completely in the bearing receptacle 15 are recorded or receivable. In other words, the crank pin is on the outer peripheral side in the circumferential direction at least partially and in the present case completely in the bearing receiver 15 and thus in the cross lever 12 recordable or recorded. Related to the first depository 14 thus provides the cross lever 12 a hub member, wherein the bearing receptacle 15 the hub is, while the crankpin a shaft member of the first bearing 14 is.

The lever arrangement 10 also includes a main connecting rod 16 , which on the one hand via a first connecting rod eye 18 articulated with the piston of the internal combustion engine can be coupled. This is in the first connecting rod eye 18 a piston pin at least partially receivable, wherein the piston pin is coupled to the piston.

On the other hand, the main connecting rod 16 - as in synopsis with 2 is recognizable - at least a second storage location 20 articulated with the cross lever 12 connected. In other words, the main stick is 16 at the second depository 20 on the cross lever 12 relative to the cross lever 12 rotatably mounted. This includes the second depository 20 a second connecting rod eye 22 of the main staff 16 which of a bolt 24 is permeated. The bolt 24 is in its circumferential direction completely circumferential in the second connecting rod eye 22 added. The second depository 20 also includes bearing mounts 26 . 28 of the cross lever 12 in which the bolt 24 Outside circumference completely circumferentially received in the circumferential direction. The storage of the main connecting rod 16 at the cross lever 12 is floating. This means that the bolt 24 freely rotatable and in the axial direction of the bolt 24 by security elements 30 . 32 is secured. The security elements 30 . 32 are there by means of a screw 34 and a mother corresponding to it 36 on the screw 34 is screwed on the bolt 24 held.

Relating to the second depository 20 set the cross lever 12 and the main connecting rod 16 respective hub elements which, as the respective hub, the second connecting rod eye 22 or the bearing mounts 26 . 28 exhibit. The bolt 24 is a shaft element of the second bearing 20 which is received on the outer peripheral side in the hubs or in the hub elements. The bearing shots 26 . 28 are in Laschen 27 . 29 of the cross lever 12 intended.

Furthermore, the lever arrangement 10 a so-called Nebenpleuel 38 on which - how particularly well in conjunction with 4 is recognizable - on the one hand at least a third storage location 40 articulated on the cross lever 12 , ie at the cross lever 12 relative to the cross lever 12 is rotatably mounted. On the other hand, the Nebenpleuel 38 at least a fourth storage location 42 at an in 1 not shown and about a rotation axis 44 rotatable adjusting shaft of the reciprocating internal combustion engine rotatably mounted relative to the actuating shaft. The control shaft is designed as an eccentric shaft and includes at least one with the Nebenpleuel 38 corresponding eccentric element whose central axis at least substantially parallel to the axis of rotation 44 runs and from the axis of rotation 44 is spaced. This can be achieved by a rotation of the actuating shaft about the axis of rotation 44 a rotation of the cross lever 12 be effected relative to the crank pin, which in turn causes a shift of the Piston results relative to the associated cylinder. In this way, the compression ratio can be adjusted as needed.

The third depository 40 includes a third connecting rod eye 46 of the secondary connecting rod 38 , The third connecting rod eye 46 serves as a bearing receiver, in which a bolt 49 is included. The bolt 49 is in the present case on the outer peripheral side in the circumferential direction at least partially and in the present case completely from the Nebenpleuel 38 surround. Thus, the bolt provides 49 a shaft element of the third bearing 40 while the auxiliary connecting rod 38 a hub element of the third bearing 40 represents, which as hub the third connecting rod eye 46 includes.

The third depository 40 comprises as a further hub member the cross lever 12 , which acts as hubs bearing receptacles 48 . 50 having. Here is the bolt 38 Outside circumference in the circumferential direction at least partially and in the present case completely in the bearing mounts 48 . 50 taken or surrounded. Also the bolt 49 over which the Nebenpleuel 38 with the cross lever 12 is coupled, is floating and thus freely rotatable and axially secured. These are security elements 52 . 54 provided, which by means of a screw 56 and a mother corresponding to it 58 which is on the screw 56 is screwed on the bolt 49 are secured. Also the bearing shots 48 . 50 are in Laschen 59 . 51 of the cross lever 12 intended.

The fourth depository 42 is assigned a bearing seat, which by a fourth connecting rod eye 60 of the secondary connecting rod 38 is formed. In the fourth connecting rod eye 60 the eccentric element of the actuating shaft is receivable, so that the eccentric element on the outer peripheral side in the circumferential direction at least partially and in the present case completely from the Nebenpleuel 38 is surrounded. This is the Nebenpleuel 38 a hub member of the fourth bearing 42 , wherein the fourth connecting rod eye 60 the hub is, while the eccentric element is a shaft element of the fourth bearing 42 is. In 1 is also a cylinder axis 63 of the cylinder as well as a groove 65 of the secondary connecting rod 38 recognizable.

How out 1 to 3 recognizable, is the second depository 20 for a supply of the second depository 20 designed with lubricant from a lubricant mist, wherein the lubricant mist is accommodated in a housing member of the reciprocating internal combustion engine. This housing element is a crankcase of the internal combustion engine, which is the lever arrangement 10 surrounds.

In 1 is a stroke of the crankshaft or the crank pin illustrated and with 21 designated. Also is in 1 illustrates a stroke of the eccentric element or the eccentric shaft and with 17 designated. Furthermore, in 1 is also one with 19 Designated axis of rotation of the crankshaft recognizable.

Now the second depository 20 especially between the tab 27 and the bolt 24 , between the tab 29 and the bolt 24 and between the main connecting rod 16 and the bolt 24 with lubricant, in particular lubricating oil to supply from the lubricant mist, is the second bearing point 20 a catch element 62 assigned to capture the lubricant from the lubricant mist. The catch element 62 includes bevels 64 of the cross lever 12 , which in the axial direction of the second bearing 20 or the bolt 24 next to the main connecting rod 16 are arranged and thus on respective end faces 66 . 68 of the cross lever 12 are arranged. The chamfers 64 thereby run obliquely to the radial direction and obliquely to the axial direction of the second bearing point 20 or the bolt 24 , How out 2 it can be seen, are the chamfers 64 at the tabs 27 . 29 intended. Also the second connecting rod eye 22 has lateral chamfers 70 of the catchment 62 on, which at respective end faces 72 . 74 of the main staff 16 are provided and extend at least substantially obliquely to the axial direction and obliquely to the radial direction.

How out 2 is recognizable, in this case has the Hauptpleuel 16 at least partially an at least substantially trapezoidal cross-section, which leads to a particularly advantageous supply at least the bearing gap between the Hauptpleuel 16 and the bolt 24 with lubricant from the lubricant mist leads.

The catch element 62 also includes respective chamfers 76 the tabs 27 . 29 as well as respective bevels 78 of the second connecting rod eye 22 , where the chamfer 76 on respective, in the axial direction facing away from each other sides of the transverse lever 12 (Hub member) are arranged in the axial direction outer edge regions of this. Also the chamfer 78 are on respective, axially opposite sides of the Hauptpleuels 16 in outer marginal areas of the Hauptpleuels 16 intended.

The respective chamfers 76 . 78 are at least substantially conical and taper in the axial direction inwards. About the bevels 64 . 70 to the chamfers 76 . 78 getting lubricant gets from the chamfers 76 . 78 during a rotary movement of the bolt 24 relative to the main connecting rod 16 or relative to the tabs 27 . 29 in respective bearing gaps between the tab 27 and the bolt 24 , between the tab 29 and the bolt 24 as well as between the main connecting rod 16 and the bolt 24 moved in. The chamfers 76 . 78 are in particular from 3 to be taken, where 3 one in 2 marked area X in an enlarged view shows.

How out 1 . 4 and 5 recognizable, also have the tabs 59 . 61 on the front sides 66 . 68 of the cross lever 12 respective chamfers 80 . 82 on which a catch element 84 the third depository 40 assigned.

Also the catch element 84 includes chamfers 86 of the secondary connecting rod 38 , which at respective opposite end faces in the axial direction 88 . 90 of the secondary connecting rod 38 are provided. Furthermore, the catch element comprises 84 respective lateral chamfers 92 , which at the end faces remote from each other in the axial direction 66 . 68 the tabs 59 . 61 or the cross lever 12 are arranged. Also the respective chamfers 86 . 92 draw lubricant from the lubricant mist into a respective bearing gap between the tab 59 and the bolt 49 , between the tab 61 and the bolt 49 and between the Nebenpleuel 38 around the bolt 49 , Thus, also the third depository 40 for a supply of the third depository 40 designed with lubricant from the lubricant mist.

The chamfers 86 . 92 are also very good 5 recognizable, wherein 5 one in 4 illustrated area Y in an enlarged view.

6 and 7 show the lever arrangement 10 In particular, it can be seen from the sectional view along the section line CC that the fourth bearing point is also visible 42 a catch element 94 assigned to capture lubricant from the lubricant mist. Thus, also the fourth depository 42 for a supply of the fourth depository 42 designed with lubricant from the lubricant mist. The security elements 30 . 32 , the screws 34 and the nuts 36 are in the side views of the lever assemblies 10 according to 1 . 6 . 8th and 10 for reasons of recognizability of the catch elements 62 . 84 respectively. 94 each not shown.

Also the catch element 94 includes respective chamfers 96 at the fourth connecting rod eye 60 of the secondary connecting rod 38 , which at the respective, opposite end faces 88 . 90 of the secondary connecting rod 38 are arranged. Both the chamfers 86 as well as the chamfer 92 and the chamfers 96 taper in the axial direction from outside to inside, so that they pull lubricant from the lubricant mist inward into a respective bearing gap. The chamfers 96 pull the lubricant into the corresponding bearing gap between the secondary connecting rod 38 and the in 7 partially shown and with 98 designated actuating shaft. In 7 are also grooves 65 of the secondary connecting rod 38 recognizable.

As is the third depository 40 and the fourth depository 42 for a supply of the third depository 40 and the fourth depository 42 are designed with lubricant from the lubricant mist, costly to produce lubricant channels such as holes in the crankshaft, the cross lever 12 , the main connecting rod 16 , the control shaft 98 and the Nebenpleuel 38 and / or in other components of the lever assembly 10 be avoided.

Based on 8th to 11 is another embodiment of the lever assembly 10 illustrated. The catch element 62 now includes instead of bevels 64 . 70 Lubricant collecting pockets 100 . 102 which are on the end faces remote from each other in the axial direction 66 . 68 of the cross lever 12 are arranged. The grease collecting pockets 100 . 102 are here as respective recesses of a respective surface of the transverse lever 12 on the front sides 66 . 68 trained and can capture the lubricant from the lubricant mist and the chamfers 76 lead, then further promote the lubricant in the corresponding bearing gap. The chamfers 70 and the chamfers 78 at the main connecting rod 16 are still available.

Out 10 and 11 is recognizable that the catch element 84 the third depository 40 Lubricant collecting pockets 104 . 106 includes, which on the front sides 66 . 68 are arranged. Also the grease collecting pockets 104 . 106 are as respective recesses of a respective surface of the cross lever 12 on the front sides 66 . 68 trained, can catch lubricant from the lubricant mist and to the chamfers 92 the tabs 59 . 61 to lead. From here, beyond, the chamfers 86 of the secondary connecting rod 38 supplied with oil.

At the lever arrangement 10 is thus a secure supply of bearings 20 . 40 . 42 ensured with lubricant in a simple and cost-effective manner.

In 9 is also a respective Anlaufbund 97 . 99 of the cross lever 12 to recognize. About the respective startup association 97 . 99 can the cross lever 12 in the axial direction at the in 9 recognizable and with 101 support designated crankshaft.

In 9 is also the crank pin on which the cross lever 12 is stored, recognizable and with 103 designated. There are with 105 the outer peripheral side bearing surfaces of the second bearing 14 , to which the cross lever 12 on the crankpin 103 is stored, designated.

LIST OF REFERENCE NUMBERS

10

lever assembly

12

transverse lever

14

first depository

15

bearing seat

16

Hauptpleuel

17

stroke

18

first connecting rod eye

19

axis of rotation

20

second depository

21

stroke

22

Second connecting rod eye

24

bolt

26

bearing seat

27

flap

28

bearing seat

29

flap

30

fuse element

32

fuse element

34

screw

36

mother

38

auxiliary connecting rod

40

third depository

42

fourth depository

44

axis of rotation

46

Third connecting rod eye

48

bearing seat

49

bolt

50

bearing seat

52

fuse element

54

fuse element

56

screw

58

mother

59

flap

60

fourth connecting rod eye

61

flap

62

catching element

63

cylinder axis

64

bevel

65

groove

66

front

68

front

70

bevel

72

front

74

front

76

chamfer

78

chamfer

80

bevel

82

bevel

84

catching element

86

chamfer

88

front

90

front

92

chamfer

94

catching element

96

chamfer

97

stop collar

98

actuating shaft

99

stop collar

100

Lubricant collecting pocket

101

crankshaft

102

Lubricant collecting pocket

103

crank pins

104

Lubricant collecting pocket

105

storage area

106

Lubricant collecting pocket

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 2012/0111143 A1 [0002]

Claims (8)

Reciprocating internal combustion engine with at least one variably adjustable compression ratio, with at least one lever element ( 12 ), which at at least a first storage location ( 14 ) on a crankpin ( 103 ) a crankshaft ( 101 ) of the reciprocating internal combustion engine relative to the crankpin ( 103 ) is rotatably mounted, with at least one of a piston of the reciprocating internal combustion engine associated Hauptpleuel ( 16 ), which at at least one second storage location ( 20 ) on the lever element ( 12 ) relative to the lever element ( 12 ) is rotatably mounted, and with at least one Nebenpleuel ( 38 ) which, on the one hand, belongs to at least one third depository ( 40 ) on the lever element ( 12 ) relative to the lever element ( 12 ) and at least one fourth bearing ( 42 ) at one about a rotation axis ( 44 ) rotatable actuating shaft of ( 98 ) Reciprocating internal combustion engine relative to the control shaft ( 98 ) is rotatably mounted for setting the compression ratio, characterized in that at least one of the bearing points ( 14 . 20 . 40 . 42 ) for a supply of the at least one storage location ( 14 . 20 . 40 . 42 ) with lubricant from a at least one storage location ( 14 . 20 . 40 . 42 ) is designed surrounding housing element of the reciprocating internal combustion engine recorded lubricant mist. Reciprocating internal combustion engine according to claim 1, characterized in that the at least one bearing point ( 14 . 20 . 40 . 42 ) at least one catch element ( 62 . 84 . 94 ) is associated for capturing the lubricant from the lubricant mist. Reciprocating internal combustion engine according to claim 2, characterized in that the catch element ( 62 . 84 . 94 ) at least one bevel ( 64 . 80 . 84 ) a surface of the lever element ( 12 ). Reciprocating internal combustion engine according to one of claims 2 or 3, characterized in that the catch element ( 62 . 84 . 94 ) at least one recess ( 100 . 102 . 104 . 106 ) a surface of the lever element ( 12 ). Reciprocating internal combustion engine according to one of claims 2 to 4, characterized in that the at least one guide element is provided, by means of which the means of Fangelements ( 62 . 84 . 94 ) captured lubricant to a bearing gap of the at least one bearing ( 14 . 20 . 40 . 42 ) is feasible. Reciprocating internal combustion engine according to one of the preceding claims, characterized in that the at least one bearing point ( 14 . 20 . 40 . 42 ) a wave element ( 24 . 49 . 98 . 103 ) and a shaft element ( 24 . 49 . 98 . 103 ) outer peripheral side in the circumferential direction of the shaft member ( 24 . 49 . 98 . 103 ) at least partially surrounding hub element ( 12 . 16 . 38 ), wherein the hub element ( 12 . 16 . 38 ) and / or the wave element ( 24 . 49 . 98 . 103 ) at least one oblique to the axial direction of the shaft member ( 24 . 49 . 98 . 103 ) running bevel ( 76 . 78 . 86 . 92 . 96 ) having. Reciprocating internal combustion engine according to claim 6, characterized in that the chamfer ( 76 . 78 . 86 . 92 . 96 ) in the axial direction of the shaft element ( 24 . 49 . 98 . 103 ) in an outer edge region of the hub element ( 12 . 16 . 38 ) or of the shaft element ( 24 . 49 . 98 . 103 ) is arranged. Reciprocating internal combustion engine according to one of the preceding claims, characterized in that the chamfer ( 76 . 78 . 86 . 92 . 96 ) tapers in the axial direction from outside to inside.

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