EP3825202B1 - Connecting rod, in particular for a central buffer coupling of a railway vehicle, and nut for connecting a connecting anchor of a connecting rod to a drawbar of the connecting rod - Google Patents

Description

The present invention relates to a tie rod, in particular for a central buffer coupling of a rail vehicle, comprising a tie rod and a tie rod, the tie rod being connected to the tie rod by means of a screw connection, the screw connection comprising a nut screwed onto the end of the tie rod. Furthermore, the present invention relates to a nut for connecting a tie rod of a tie rod to a tie rod of the tie rod, a coupling, in particular a central buffer coupling, for a rail vehicle, a rail vehicle with a coupling, and a method for connecting a tie rod of a tie rod to a tie rod of the tie rod .

Technological background

In order to connect the carriages of rail vehicles, couplings arranged between the carriages are used in the prior art. A special embodiment of such couplings is the so-called central buffer coupling, which is a combination of a buffer and a coupling. Central buffer couplings can be used in all types of rail vehicles. A special area of application are regional and trams as well as underground and suburban trains.

A central buffer coupling comprises a tie rod, the task of which is to transmit forces between the individual carriages of the rail vehicle in both the tensile and compressive directions and to absorb shocks. Tension rods usually include a tie rod, which is connected to a tension tube, also known as a deformation tube. On the vehicle side, the towing tube has a towing eye. On the opposite side, the tie rod is connected to a tie rod head, which in turn can be coupled via coupling heads or directly to another coupling of an adjacent carriage of the rail vehicle. For the connection to the tie rod, the tie rod is guided through an opening in the bottom of the tie rod and secured by means of a nut placed on the end of the tie rod on the inside of the tie rod. The pulling forces acting on the coupling are transmitted from the head of the pull rod to the pull eye via this connection. A spring pack can also be provided within the pull rod, which can be compressed in the pull and push directions and thus enables shocks to be dampened.

From the EP 0 029 128 A1 a towing device for rail vehicles is known. The pulling device essentially consists of a support plate that can be connected to the vehicle, a pull rod that penetrates the support plate, and a spring. The pull rod has a coupling body at its front end and a nut at its rear end, which interacts with the spring by arranging a pulling element.

From the DE 20 2005 004 502 U1 the applicant is aware of a pulling and buffing device for central buffer couplings of rail vehicles. The pulling and buffering device has an energy absorption system on the pressure side and an energy absorption system on the tension side, which are connected in series and arranged within a housing.

With the known screw connection of tie rod and tie rod by means of a nut placed on the end of the tie rod from the inside of the tie rod, there is a risk that the nut will become detached from the tie rod, which can result in unwanted cable separation. In addition, shim washers are used in the known screw connections in order to adjust the system without play. Too many shims lead to excessive preloading of the spring assembly within the pull rod. Too few shims mean play within the drawbar system. In the prior art, the number of shims is determined by measuring and trying out. The use of shims is therefore expensive and time-consuming.

Description of the invention: task, solution, advantages

It is the object of the present invention to provide a drawbar, in particular for a central buffer coupling of a rail vehicle, with which the risk of unwanted train separations is reduced or eliminated. In addition, the object of the invention is a nut for connecting a tie rod of a tie rod to a tie rod of the tie rod, a coupling, in particular a central buffer coupling, for a rail vehicle, a rail vehicle with a coupling and a method for connecting a tie rod of a tie rod with provide a pull tube of the pull rod, with which the aforementioned advantage is achieved.

To solve the problem, a tie rod is proposed, in particular for a central buffer coupling of a rail vehicle, comprising a tie rod and a tie rod, the tie rod being connected to the tie rod by means of a screw connection, the screw connection comprising a nut screwed onto the end of the tie rod, the The nut is designed in two parts and comprises an inner nut part and a clamping part, with the clamping part being placed on the inner nut part and the inner nut part being clamped to the tie rod, it also being proposed that the inner nut part have an internal thread and be screwed onto an external thread of the tie rod, and that the clamping part has an internal thread and is screwed onto an external thread of the nut inner part.

According to the invention, the end of the nut is screwed onto the tie rod, which means that the nut is screwed onto one end of the tie rod. The end of the tie rod is preferably that end which faces away from a tie rod head of the tie rod. For example, the end of the tie rod, that is to say with one end of the tie rod, can be guided through an opening, in particular through a hole, in a bottom of the tension tube. To connect the tie rod and the tie rod, the nut can be placed from the inside of the tie rod onto the end of the tie rod protruding through the opening. An inwardly directed flange bordering the opening in the bottom of the tension tube can bear on one side against a flange of the nut. When the nut is tightened, a stable connection between the tie rod and the draw tube is provided.

According to the invention, the nut is designed in two parts and has an inner nut part and a clamping part. The clamping part is placed on the nut inner part and clamps the nut inner part with the tie rod. For this purpose it can be provided that the nut inner part has an inner bore in which the end of the tie rod is received. The clamping part can also have an inner bore. When the clamping part is placed on the inner nut part, the inner nut part is arranged in the inner bore of the clamping part. Clamping part and nut inner part are designed such that the nut inner part at on the Nut inner part attached clamping part is clamped with the tie rod. For this purpose, a radially inwardly directed force can be exerted on the inner nut part by the clamping part, which force presses the inner nut part against the tie rod at least in certain areas. By clamping the inner part of the nut with the tie rod, a secure connection of the tie tube and tie rod is provided, in which all loads acting on the tie rod do not lead to loosening of the screw connection. The risk of unwanted train separations can thus be reduced or even eliminated. Another advantage is that shim washers no longer have to be used to ensure that the pull rod system has no backlash. With the solution according to the invention, the freedom from play can be adjusted steplessly, for example via corresponding threads of the tie rod and nut inner part.

Yet another advantage of the invention is that the nut according to the invention can be placed on the tie rods of existing tie rods without reworking. Other known solutions require additional machining on the tie rod, e.g. a cross hole for a dowel pin to secure a castellated nut. Thus, the invention provides a simple retrofit solution with which the risk of unintentional train separations can be reduced or eliminated even with existing tie rods.

The tie rod preferably comprises a spring assembly which is designed to dampen shocks in the tension and compression directions.

Furthermore, it can preferably be provided that the internal thread of the nut inner part and the external thread of the tie rod form a right-hand thread and/or that the internal thread of the clamping part and the external thread of the nut inner part form a left-hand thread. In principle, the right-hand thread and the left-hand thread can also be interchanged.

Provision is particularly preferably made for the inner nut part to have a deformation section at the end and for the clamping part to have a pressure section at the end, with the pressure section exerting a force on the deformation section so that the deformation section is elastically deformed and pressed against the tie rod.

The deformation section is arranged at the end on the nut inner part, which means that the deformation section is arranged in a section or region of the nut inner part which faces away from the tie rod and/or a tie rod head. Correspondingly, the pressure section of the clamping part is located in a region or section of the clamping part which faces away from the tie rod and/or a tie rod head. At least in the state in which it is completely arranged on the inner nut part, the pressure section exerts a radially inwardly directed force on the deformation section, so that the deformation section is elastically deformed and is pressed against the tie rod. This increases the frictional force between the end of the tie rod and the deformation section. The resulting increased frictional contact between the inner part of the nut and the tie rod secures the connection against unintentional loosening.

The elastic deformation of the deformation section is preferably elastic bending.

The deformation section preferably includes part of the internal thread of the nut inner part.

Provision is particularly preferably made for the internal thread of the inner nut part to be pressed into the external thread of the tie rod in the region of the deformation section, so that the frictional force between the inner nut part and tie rod is increased.

Provision is preferably made for the pressure section to have an inner conical surface.

In particular, the diameter of the inner bore of the clamping part decreases due to the inner conical surface from the side facing the tie rod in the direction of the side of the clamping part facing away from the tie rod. Due to this decrease in the inner diameter of the clamping part, a continuously increasing, radially inwardly directed force is exerted on the deformation section of the nut inner part by the inner conical surface of the clamping part when the clamping part is placed or screwed onto the nut inner part. The force causes deformation or bending of the deformation portion of the nut inner, whereby the nut inner part is clamped with the tie rod in the sense of a clamping safety device.

In addition, it can be provided that the deformation section has an outer conical surface. The outer conical surface is then formed in such a way that the outer diameter of the nut inner part decreases in the region of the deformation section from the side facing the tie rod to the side facing away from the tie rod.

The clamping part and the inner nut part preferably have different material properties.

With further advantage, the clamping part comprises a hardened metal, in particular hardened steel, or the clamping part consists of a hardened metal, in particular hardened steel, and the inner nut part comprises an unhardened metal, in particular unhardened steel, or consists of an unhardened metal, in particular from an unhardened steel. Alternatively, it is also possible for the clamping part to consist of or include an unhardened metal, in particular an unhardened steel, and for the inner nut part to consist of or include a hardened metal, in particular hardened steel.

If the clamping part or the inner nut part comprises a hardened metal, in particular a hardened steel, the metal or the steel can also be surface-hardened. In particular, the metal or steel does not have to be hardened through.

The pressure section preferably does not include an internal thread and the deformation section does not include an external thread.

However, in principle it is also possible for the pressure section to comprise part of the internal thread of the clamping part and for the deformation section to comprise part of the external thread of the inner nut part.

It is preferably provided that the deformation section has at least one cutout, in particular a notch or an incision, on the end and/or that the deformation section has at least one projection, in particular a lamella or a tab, on the end, with the at least one projection more preferably the outer one Includes cone surface.

On the side of the inner nut part facing away from the tie rod, there is a recess, a notch or an incision in an edge surrounding the inner bore. This recess, notch or incision makes it possible for the deformation section to be elastically bent inward when a force acts radially inward. The at least one recess, notch or incision preferably forms at least one projection which is arranged at the end of the nut inner part and is aligned in an axial direction and which is part of the deformation section. The at least one projection preferably has the outer conical surface of the nut inner part.

Provision is particularly preferably made for the deformation section to have at least two, preferably at least five, more preferably at least ten, particularly preferably exactly ten, recesses and/or for the deformation section to have at least two, preferably at least five, more preferably at least ten, particularly preferably exactly exactly at the end ten, has projections.

More particularly preferably, the projections are of different lengths.

Furthermore, it can be provided that the inner nut part has a, preferably circumferential, material taper, wherein the material taper is more preferably arranged on a bottom of the recess and/or on a base of the projection.

Due to the tapering of the material, an area of increased elasticity is created in the inner part of the nut. The tapering of the material is preferably part of the deformation section. Since the tapering of the material is preferably arranged on the bottom of the at least one recess or on the base of the at least one projection, the at least one projection can be at one of the Clamping part are bent radially inward force in the material taper inward to be clamped to the end of the tie rod.

In particular, the at least one projection, preferably the at least one tab or lamella, has an internal thread which is pressed into an external thread of the tie rod during deformation.

It is further preferably provided that the tapering of the material is a groove, the groove preferably being arranged circumferentially on the inside in the nut inner part.

Furthermore, it can be provided that the groove has an angular or semi-circular cross section.

With a further advantage, it can be provided that the clamping part has a, preferably circumferential, material taper, the material taper preferably being a groove, the groove particularly preferably being arranged circumferentially on the inside of the clamping part, the groove particularly preferably having an angular or semi-circular cross-section having.

Provision is preferably made for a securing element to be arranged on the end of the tie rod, with the securing element preferably being fastened with a screw to an end face of the tie rod, with the securing element being designed to prevent the clamping part from twisting relative to the inner part of the nut.

The securing element provides additional protection against loosening of the nut.

It is preferably provided that the screw has a left-hand thread and is screwed into a bore in the end face of the tie rod.

Screwing the screw with a left-hand thread in the face of the tie rod prevents the inner part of the nut from detaching from the tie rod if the screw were to become loose.

It can preferably be provided that the clamping part has securing projections at the end and that the securing element has an arm, the arm extending in a radial direction between the projections of the nut inner part and the securing projections of the clamping part.

On the side of the clamping part facing away from the tie rod, securing projections can be provided which protrude beyond the end face of the tie rod in the axial direction of the tie rod when they are arranged on the tie rod. The securing projections are particularly preferably arranged on an end face or on an end edge of the clamping part.

The securing element is fastened on the end face of the tie rod and has an arm which is directed outwards in a radial direction of the tie rod and protrudes between the projections of the deformation section and the securing projections of the clamping part. The arm thus represents, so to speak, a bolt which is in a positive fit with the ends of the projections of the nut inner part and the securing projections of the clamping part.

Furthermore, it can preferably be provided that the inner nut part has a flange, the flange resting on an inwardly directed flange of the tension tube.

The inwardly directed flange of the tie tube is the area of the bottom of the tie tube which encloses or borders the opening through which the end of the tie rod is guided. The inwardly directed flange of the draw tube rests against the flange of the nut without play.

The maximum torque acting on the nut, in particular on the inner part of the nut, during operation is determined by the frictional connection at the annular contact surface between the flange of the inner part of the nut and the inwardly directed flange of the tension tube. The pull rod, in particular the nut and the pull tube, are designed in such a way that the maximum torque is as low as possible even under unfavorable conditions. The maximum torque is generally determined by the maximum pulling force, the friction value of the contact surface and the effective lever arm of the contact surface to the central axis of the tie rod. The nut is preferably designed in such a way that the lever arm of the contact surface is as small as possible, ie the annular contact surface on the flange of the nut inner part or on the inwardly directed flange of the tension tube has the smallest possible diameter.

With a further advantage it can be provided that the flange of the nut inner part is hexagonal.

A further solution to the problem on which the invention is based consists in providing a nut for connecting a tie rod of a tie rod to a tie tube of the tie rod. According to the invention, the nut has an inner nut part and a clamping part, the inner nut part having an inner thread and being screwable onto an outer thread of the tie rod, and the clamping part having an inner thread and being screwable onto an outer thread of the inner nut part.

The nut according to the invention can have all the features of the nut described in connection with the pull rod described above.

In particular, the inner nut part can have a deformation section and the clamping part can have a pressure section.

A further solution to the problem on which the invention is based consists in providing a coupling, in particular a central buffer coupling, for a rail vehicle with a drawbar as described above and/or with a nut as described above.

Yet another solution is to provide a rail vehicle with a hitch as described, and/or nut and/or drawbar as described.

A further solution of the invention lies in the provision of a method for connecting a tie rod of a tie rod to a tie tube of the tie rod using a nut as described above, one end of the tie rod passing through an opening of the tie tube is guided, with the inner nut part being screwed onto the end of the tie rod and tightened until the connection is free of play, with the inner nut part being at least temporarily secured against rotation, for example held in place, with the clamping part being screwed onto the inner nut part so that the inner part of the nut is clamped with the end of the tie rod.

All of the properties and features described for the drawbar described above can be transferred in a corresponding manner to the method according to the invention.

Short description of the figures

Fig. 1

eine Seitenansicht einer Kupplung mit einer Zugstange,

Fig. 2

eine perspektivische Ansicht einer Zugstange,

Fig. 3

eine Querschnittsansicht einer Zugstange mit einem Zuganker, einem Zugrohr und einer zweiteiligen Mutter,

Fig. 4a

eine perspektivische Ansicht eines Mutterinnenteils einer Mutter,

Fig. 4b

eine Querschnittsansicht eines Mutterinnenteils einer Mutter,

Fig. 5

eine perspektivische Ansicht eines Klemmteils einer Mutter,

Fig. 6

eine Seitenansicht einer auf ein Ende eines Zugankers geschraubten zweiteiligen Mutter,

Fig. 7

eine perspektivische Ansicht einer auf ein Ende eines Zugankers geschraubten zweiteiligen Mutter, und

Fig. 8

eine auf ein Ende eines Zugankers geschraubte zweiteilige Mutter mit einem Sicherungselement.

The invention is explained in more detail below with reference to the figures. Show it

1

a side view of a coupling with a pull rod,

2

a perspective view of a pull rod,

3

a cross-sectional view of a tie rod with a tie rod, a tie tube and a two-piece nut,

Figure 4a

a perspective view of a nut inner part of a nut,

Figure 4b

a cross-sectional view of a nut inner part of a nut,

figure 5

a perspective view of a clamping part of a nut,

6

a side view of a two-part nut screwed onto one end of a tie rod,

7

a perspective view of a two-piece nut screwed onto one end of a tie rod, and

8

a two-piece nut with a locking element screwed onto one end of a tie rod.

Detailed description of the figures

1 shows a side view of a coupling 300 designed as a central buffer coupling 10 for a rail vehicle, not shown in detail. The center buffer coupling 10 includes a pull rod 100, which 2 shown in a perspective view. The pull rod 100 includes a housing 11. The pull rod also includes 100 a drawbar head 12 which can be coupled to a further coupling of an adjacent car of the rail vehicle. On the vehicle side, the pull rod also has a pull rod eye 13 .

3 shows a cross-sectional view of the tie rod 100. A tie rod 14 connected to the tie rod head 12 is arranged in the housing 11. FIG. The tie rod 14 is guided with one end 15 through an opening 16 in a base 17 of a tie tube 18 . A nut 19 is screwed onto the tie rod 14 from the inside of the tie tube 18 at the end. The nut 19 comprises a nut inner part 20 and a clamping part 21. The opening 16 in the bottom 17 of the tension tube 18 is bordered by an inwardly directed flange 22 which bears against a flange 23 of the nut inner part 20. The pull rod 100 also includes a cover 25 and a pull rod 26 with the pull rod eye 13.

Inside the housing 11 there is a spring assembly 27 which is designed to damp shocks in pressure and tensile loads and braces the tension tube 18 against the nut 19 . Due to its two-part design consisting of the inner nut part 20 and the clamping part 21, the nut 19 forms a clamping safety device, with which the risk of the nut 19 being unintentionally released from the tie rod 14 is reduced or eliminated.

In the Figures 4a and 4b the inner nut part 20 of the nut 19 is shown in a perspective view and in a cross-sectional view. The inner nut part 20 has a hexagonal flange 23 . Furthermore, the inner nut part 20 comprises a deformation section 28. The deformation section 28 is formed by a plurality of projections 29a, 29b, which are formed by recesses 31 arranged in the edge 30 of the inner nut part 20. On the inside of an inner bore 32 of the inner nut part 20 there is a circumferential material taper 33 which is arranged on the base 34 of the projections 29a, 29b or on the bottom 35 of the recesses 31. Along the material taper 33, the projections 29a, 29b can be elastically bent or deformed inwards when a force acts radially inwards on them. As in Figure 4b as can be seen, the material taper 33 is designed as a groove 47 with a semi-circular cross section. An external thread 37 is arranged on the outside 36 of the nut inner part 20 . In the inner bore 32 there is an internal thread 45 provided, which also extends over the projections 29a, 29b. Viewed in the axial direction 38 of the nut inner part 20, part of the projections 29a has a greater length than the remaining projections 29b. The protrusions 29a of longer length and the protrusions 29b of shorter length are arranged along the edge 30 alternately.

In the figure 5 a perspective view of the clamping part 21 is shown. The clamping part 21 has an internal thread 39 . A circumferential groove 41 in an internal bore 40 of the clamping part 21 is arranged between the internal thread 39 and a pressure section 42 of the clamping part 21 . At the end, the edge 43 of the clamping part 21 has securing projections 44 .

The functioning of the two-part nut 19 is based on the 6 explained in more detail. The inner nut part 20 is screwed with the inner thread 45 onto an outer thread 46 of the end 15 of the tie rod 14 until the flange 23 of the inner nut part 20 rests against the flange 22 of the tension tube 18 . Internal thread 45 of the nut inner part 20 and external thread 46 of the tie rod 14 form a right-hand thread. Due to the design, a distance remains between the flange 22 and a shoulder 24 of a slide bushing 24a surrounding the tie rod 14. The clamping part 21 is then screwed with its internal thread 39 onto the external thread 37 of the nut inner part 20 . The internal thread 39 of the clamping part 21 and the external thread 37 of the nut inner part 20 are designed as left-hand threads. The deformation section 28 of the nut inner part 20 has an outer conical surface 48 so that the outer diameter of the nut inner part 20 decreases in the direction pointing away from the tie rod 14 in the region of the deformation section 28 . The pressure section 42 of the clamping part 21 has an inner conical surface 49 so that the inner diameter of the inner bore 40 of the clamping part 21 decreases in the direction pointing away from the tie rod 14 in the area of the pressure section 42 . When the clamping part 21 is screwed onto the inner nut part 20, the inner conical surface 49 of the clamping part 21 and the outer conical surface 48 of the inner nut part 20 come into contact. If the clamping part 21 is screwed on further, the pressure section 42 of the clamping part 21 exerts a radially inwardly directed force on the projections 29a, 29b of the deformation section 28 of the nut inner part 20 via the conical surfaces 48, 49. The projections 29a, 29b are elastically bent inward along the material taper 33. FIG. Included the internal thread 45 of the inner nut part 20 is pressed into the outer thread 46 of the tie rod 14 in the region of the deformation section 28, so that greater frictional contact is produced between the inner nut part 20 and the end 15 of the tie rod 14. The increased frictional contact results in the nut 19 being clamped on the end 15 of the tie rod 14. 7 shows a perspective view of the nut 19 screwed onto the end 15 of the tie rod 14, comprising the inner nut part 20 and the clamping part 21.

An additional fuse of nut 19 is in 8 shown. A securing element 51 is fastened with a screw 52 on the end face 50 of the tie rod 14 . The longer projections 29a of the deformation section 28 of the nut inner part 20 and the securing projections 44 of the clamping part 21 protrude in the axial direction 38 beyond the end face 50 of the tie rod 14 . Securing element 51 has an arm 54 directed outwards in radial direction 53, which protrudes between the ends of longer projections 29a of deformation section 28 of nut inner part 20 and the securing projections 44 of clamping part 21 and forms a latch by means of a positive fit, which prevents mutual twisting from clamping part 21 to nut inner part 20 is prevented.

List of References

100

pull bar

10

central buffer coupling

11

Housing

12

tie rod head

13

tie rod eye

14

tie rod

15

End

16

opening

17

Floor

18

draft tube

19

Mother

20

female inner part

21

clamping part

22

flange

23

Flange of nut inner part

24

Unit volume

24a

sliding bush

25

Lid

26

pull eye rod

27

spring pack

28

deformation section

29a

head Start

29b

head Start

30

edge

31

recess

32

inner bore

33

material rejuvenation

34

Base

35

Floor

36

outside

37

external thread

38

axial direction

39

inner thread

40

inner bore

41

groove

42

print section

43

edge

44

securing tabs

45

inner thread

46

external thread

47

groove

48

Outer cone surface

49

inner cone surface

50

face

51

fuse element

52

screw

53

radial direction

54

poor

300

coupling

Claims (13)

1. A tie rod (100), in particular for a central buffer coupling (10) of a rail vehicle, comprising a tie anchor (14) and a tie tube (18), wherein the tie anchor (14) is connected to the tie tube (18) by means of a screw connection, wherein the screw connection comprises a nut (19) screwed onto the tie anchor (14) on the end side, characterized in that the nut (19) is formed in two parts and comprises an inner nut part (20) and a clamping part (21), wherein the clamping part (21) is placed on the inner nut part (20) and clamps the inner nut part (20) to the tie anchor (14), wherein the inner nut part (20) has an internal thread (45) and is screwed onto an external thread (46) of the tie anchor (14), and the clamping part (21) has an internal thread (39) and is screwed onto an external thread (37) of the inner nut part (20).
2. The tie rod (100) according to claim 1, characterized in that the inner nut part (20) has a deformation section (28) on the end side, and in that the clamping part (21) has a pressure section (42) on the end side, wherein the pressure section (42) exerts a force on the deformation section (28), such that the deformation section (28) is elastically deformed and pressed against the tie anchor (14).
3. The tie rod (100) according to claim 2, characterized in that the internal thread (45) of the inner nut part (20) is pressed into the external thread (46) of the tie anchor (14) in the region of the deformation section (28), so that the friction force between the inner nut part (20) and the tie anchor (14) is increased.
4. The tie rod (100) according to claim 2 or 3, characterized in that the pressure section (42) has an inner conical surface (49), and/or in that the deformation section (28) has an outer conical surface (48).
5. The tie rod (100) according to any one of claims 2 to 4, characterized in that the deformation section (28) has on its end side at least one recess (31), in particular a notch or an indentation, and/or in that the deformation section (28) has on its end side at least one projection (29a, 29b), in particular a lamella or a tab, wherein the projection (29a, 29b) preferably comprises the outer conical surface (48).
6. The tie rod (100) according to claim 5, characterized in that the deformation section (28) has on its end side at least two, preferably at least five, more preferably at least ten, in particular preferably exactly ten, recesses (31), and/or that the deformation section (28) has on its end side at least two, preferably at least five, more preferably at least ten, in particular preferably exactly ten, projections (29a, 29b), wherein the projections (29a, 29b) are very particularly preferably of different lengths.
7. The tie rod (100) according to one of the preceding claims, characterized in that the inner nut part (20) has a, preferably circumferential, material taper (33), wherein the material taper (33) is preferably arranged on a base (35) of the recess (31) and/or on a base (34) of the projection (29a, 29b), wherein the material taper (33) in particularly preferably a groove (47), wherein the groove (47) is very particularly preferably arranged circumferentially on the inside in the inner nut part (20).
8. The tie rod (100) according to one of the preceding claims, characterized in that a securing element (51) is arranged on the end side of the tie anchor (14), in particular fastened by a screw (52), wherein the securing element (51) is configured to prevent a rotation of the clamping part (21) with respect to the inner nut part (20), wherein the clamping part (21) preferably has securing projections (44) on the end side, wherein the securing element (51) has an arm (54), wherein the arm (54) extends in a radial direction (53) between the projections (29a) of the inner nut part (20) and the securing projections (44) of the clamping part (21).
9. The tie rod (100) according to one of the preceding claims, characterized in that the inner nut part (20) has a flange (23), wherein the flange (23) rests on an inwardly directed flange (22) of the tie tube (18), wherein the flange (23) of the inner nut part (20) is preferably hexagonal.
10. A nut (19) for connecting a tie anchor (14) of a tie rod (100) to a tie tube (18) of the tie rod (100), characterized in that the nut (19) is formed in two parts and comprises an inner nut part (20) and a clamping part (21), wherein the clamping part (21) is placed on the inner nut part (20) and the inner nut part (20) is provided for clamping with the tie anchor (14), wherein the inner nut part (20) has an internal thread (45) and can be screwed onto an external thread (46) of the tie anchor (14), and in that the clamping part (21) has an internal thread (39) and can be screwed onto an external thread (37) of the inner nut part (20).
11. Coupling (300), in particular central buffer coupling (10), for a rail vehicle with a tie rod (100) according to one of claims 1 to 9.
12. Rail vehicle with a coupling (300) according to claim 11.
13. Method for connecting a tie anchor (14) of a tie rod (100) to a tie tube (18) of the tie rod (100) using a nut (19) according to claim 10, wherein an end (15) of the tie anchor (14) is guided through an opening (16) of the tie tube (18), wherein the inner nut part (20) is screwed onto the end (15) of the tie anchor (14) and tightened until the connection is free of play, wherein the inner nut part (20) is at least temporarily secured against rotation, for example retained, wherein the clamping part (21) is screwed onto the inner nut part (20) so that the inner nut part (20) is clamped to the end (15) of the tie anchor (14).

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