EP3825202A1 - 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

Abstract

In order to reduce or eliminate the risk of unwanted train disconnections in rail vehicles, a tie rod (100), in particular for a central buffer coupling (10) of a rail vehicle, comprising a tie rod (14) and a draw tube (18), the tie rod (14 ) is connected to the draw tube (18) by means of a screw connection, the screw connection comprising a nut (19) screwed onto the end of the tie rod (14), the nut (19) being in two parts and a nut inner part (20) and a clamping part ( 21), the clamping part (21) being placed on the inner nut part (20) and the inner nut part (20) being clamped to the tie rod (14).

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 tube, the tie rod being connected to the tie tube by means of a screw connection, the screw connection comprising a nut screwed onto the tie rod at the end. The present invention further 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

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 with 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 pull rod, the task of which is to transmit forces between the individual wagons of the rail vehicle in both the pulling and pushing directions and to dampen shocks. Tie rods usually include a tie rod which is connected to a tension tube, also called a deformation tube. On the vehicle side, the draw tube has a draw 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 a further coupling of an adjacent car of the rail vehicle. For the connection with the draw tube, the tie rod is passed through an opening in the bottom of the draw tube and secured by means of a nut placed on the end of the tie rod on the inside of the draw tube. Via this connection, the The pulling forces acting on the coupling are transferred from the pull rod head to the pull eye. A spring assembly can also be provided within the pull rod, which can be compressed in the pulling and pushing directions and thus enables shock absorption.

From the DE 20 2005 004 502 U1 the applicant is known a pulling and pushing device for central buffer couplings of rail vehicles. The pulling and pushing device has a pressure-side and a pull-side energy dissipation system, which are connected in series and arranged within a housing.

In 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 pipe, there is a risk that the nut will detach from the tie rod, which can result in unintentional tension disconnection. In addition, shim washers are used with the known screw connections to set the system free of play. Too many shims lead to excessive pretensioning of the spring assembly within the drawbar. Too few shims mean there is play within the tie rod 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.

Presentation of the invention: task, solution, advantages

It is the object of the present invention to provide a tie rod, in particular for a central buffer coupling of a rail vehicle, with which the risk of undesired train disconnections is reduced or eliminated. In addition, it is the object of the invention to provide 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 draw pipe of the Provide pull rod with which the aforementioned advantage is achieved.

To achieve the object, a tie rod, in particular for a central buffer coupling of a rail vehicle, is proposed, comprising a Tie rod and a tie rod, the tie rod being connected to the tie tube by means of a screw connection, the screw connection comprising a nut screwed onto the end of the tie rod, it being further proposed that the nut be designed in two parts and comprise a nut inner part and a clamping part, the Clamping part is placed on the inner nut part and the inner nut part is clamped with the tie rod.

According to the invention, the end of the nut is screwed onto the tie rod, that is to say 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 tie rod can be guided at the end, that is to say with one end of the tie rod, through an opening, in particular through a hole, in a base of the draw tube. To connect the tie rod and the tie tube, the nut can be placed from the inside of the tie tube onto the end of the tie rod protruding through the opening. An inwardly directed flange bordering the opening in the base of the draw tube can rest on one side against a flange of the nut. If 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 inner nut part and clamps the inner nut part with the tie rod. For this purpose it can be provided that the inner nut 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. The clamping part and the inner nut part are designed in such a way that the inner nut part is clamped to the tie rod when the inner nut part is placed on the clamping part. 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 some areas. Clamping the inner nut part with the tie rod provides a secure connection between the draw tube and the draw bar, in which all the loads acting on the draw bar do not lead to the screw connection being loosened. The risk of unintentional train disconnections can thus be reduced or even eliminated. Another advantage is that shims no longer have to be used to ensure that the tie rod system is free of play. With the solution according to the invention, the freedom from backlash can be set continuously, for example via corresponding threads of the tie rod and inner nut 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 work on the tie rod, e.g. a cross hole for a dowel pin to secure a castle nut. The invention thus provides a simple retrofit solution with which the risk of unwanted train disconnections can be reduced or eliminated even with existing tie rods.

The pull rod preferably comprises a spring assembly which is designed to dampen shocks in the pulling and pushing directions.

Furthermore, it is preferably provided that the inner nut part has an internal thread and is screwed onto an external thread of the tie rod.

With a further advantage it can be provided that the clamping part has an internal thread and is screwed onto an external thread of the inner nut part.

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

It is particularly preferred that the inner nut part has a deformation section at the end and that the clamping part has a pressure section at the end, 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 inner nut part, that is to say that the deformation section is arranged in a section or region of the inner nut 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 an area or section of the clamping part which faces away from the tie rod and / or a tie rod head. The pressure section exerts a radially inwardly directed force on the deformation section, at least when it is completely arranged on the nut inner part, 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 nut part and the tie rod secures the connection against unintentional loosening.

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

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

It is particularly preferred that the internal thread of the inner nut part is pressed into the outer thread of the tie rod in the area of the deformation section, so that the frictional force between the inner nut part and tie rod is increased.

It is preferably provided that the pressure section has 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. As a result of this decrease in the inside 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 inner nut part. The force causes a deformation or bending of the deformation section of the inner nut part, whereby the inner nut part is clamped with the tie rod in the sense of a clamping lock.

In addition, it can be provided that the deformation section has an outer conical surface. The outer conical surface is then designed such that the outer diameter of the inner nut part decreases in the area 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 a further advantage, the clamping part comprises a hardened metal, in particular a hardened steel, or the clamping part consists of a hardened metal, in particular a hardened steel, and the inner nut part comprises an unhardened metal, in particular an unhardened steel, or consists of an unhardened metal, in particular from an unhardened steel. Alternatively, it is also possible that the clamping part consists of an unhardened metal, in particular an unhardened steel, or includes one, and that the inner nut part consists of or includes 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, then the metal or the steel can also be hardened on the surface. In particular, the metal or steel does not have to be fully hardened.

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

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

It is preferably provided that the deformation section has at least one recess at the end, in particular a notch or an incision, and / or that the deformation section has at least one protrusion, in particular a lamella or a tab, at the end, the at least one protrusion further preferably the outer one Includes conical surface.

On the side of the inner nut part facing away from the tie rod there is thus 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 inwards in the event of a force acting radially inwards. The at least one recess, notch or incision preferably forms at least one projection which is arranged on the end of the inner nut part and aligned in an axial direction and is part of the deformation section. The at least one projection preferably has the outer conical surface of the inner nut part.

It is particularly preferably provided that the deformation section has at least two, preferably at least five, more preferably at least ten, especially preferably exactly ten, recesses, and / or that the deformation section at the end has at least two, preferably at least five, more preferably at least ten, particularly preferably exactly ten, protrusions.

The projections are more particularly preferably of different lengths.

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

The tapering of the material creates an area of increased elasticity in the inner part of the nut. The material taper is preferably part of the deformation section. Since the material taper 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 in one of the Clamping part radially inwardly directed force in the area of the material taper to be bent inward to be clamped with the tie rod end.

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 the deformation.

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

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

With a further advantage it can be provided that the clamping part has a, preferably circumferential, material tapering, the material tapering preferably being a groove, wherein the groove is particularly preferably arranged circumferentially on the inside in the clamping part, the groove very particularly preferably having an angular or semicircular cross-section having.

It is preferably provided that a securing element is arranged on the end of the tie rod, the securing element preferably being fastened to an end face of the tie rod with a screw, the securing element being designed to prevent the clamping part from rotating relative to the inner nut part.

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.

The screw connection of the screw with a left-hand thread in the end face of the tie rod prevents the inner nut part from becoming detached from the tie rod if the screw should loosen.

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 inner nut 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, when arranged on the tie rod, protrude in the axial direction of the tie rod over the end face of the tie rod. The securing projections are particularly preferably arranged on an end face or on an end face edge of the clamping part.

The securing element is attached to the end face of the tie rod and has an arm which is directed outward 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 a latch, so to speak, which is in a form fit with the ends of the projections of the inner nut 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 draw tube.

The inwardly directed flange of the draw tube is the area of the base of the draw 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 nut inner part, during operation is determined by the frictional connection on the annular contact surface between the flange of the nut inner part and the inwardly directed flange of the draw 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 influenced by the maximum tensile force, the coefficient of friction 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 so that the lever arm of the contact surface is as small as possible, that is, the annular contact surface on the flange of the nut inner part or on the inwardly directed flange of the draw tube has the smallest possible diameter.

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

Another solution to the problem on which the invention is based is to provide a nut for connecting a tie rod of a tie rod to a tie rod of the tie rod. According to the invention, the nut has an inner nut part and a clamping 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.

Another solution to the problem on which the invention is based is to provide a coupling, in particular a central buffer coupling, for a rail vehicle with a previously described drawbar and / or with a previously described nut.

Yet another solution consists in providing a rail vehicle with a coupling as described above and / or a nut as described above and / or a tie rod as described above.

Another solution of the invention is the provision of a method for connecting a tie rod of a tie rod to a tie rod of the tie rod using a previously described nut, one end of the tie rod being passed through an opening of the tie rod, the inner nut part on the end of the The tie rod is screwed on and tightened until the connection is free of play, the inner nut part being at least temporarily secured against rotation, for example held in place, the clamping part being screwed onto the inner nut part so that the inner nut part is clamped to the end of the tie rod.

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

Brief 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

Fig. 1

a side view of a coupling with a pull rod,

Fig. 2

a perspective view of a pull rod,

Fig. 3

a cross-sectional view of a tie rod with a tie rod, a draw tube and a two-part 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,

Fig. 5

a perspective view of a clamping part of a nut,

Fig. 6

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

Fig. 7

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

Fig. 8

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

Detailed description of the figures

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

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

A spring assembly 27 is arranged inside the housing 11, which is designed to dampen impacts under pressure and tensile loads and which braces the draw 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 lock, with which the risk of the nut 19 being inadvertently loosened 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. The inner nut part 20 further comprises a deformation section 28. The deformation section 28 is formed by several 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, a circumferential material taper 33 is provided, 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 in the event of a force acting on them radially inwards. As in Figure 4b As can be seen, the material taper 33 is designed as a groove 47 with a semicircular cross section. On the outside 36 of the inner nut part 20 is a External thread 37 arranged. In the inner bore 32, an internal thread 45 is provided, which also extends over the projections 29a, 29b. Viewed in the axial direction 38 of the inner nut part 20, some of the projections 29a have a greater length than the remaining projections 29b. The protrusions 29a of greater length and the protrusions 29b of shorter length are arranged alternately along the edge 30.

In the Fig. 5 a perspective view of the clamping part 21 is shown. The clamping part 21 has an internal thread 39. A groove 41 encircling an inner 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 Fig. 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 inner nut part 20 and external thread 46 of 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 inner nut 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 inner nut part 20 has an outer conical surface 48 so that the outer diameter of the inner nut part 20 decreases in the direction pointing away from the tie rod 14 in the area 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, via the conical surfaces 48, 49. 29b of the deformation section 28 of the inner nut part 20. The projections 29a, 29b are elastically bent inwardly along the material taper 33. The internal thread 45 of the inner nut part 20 is pressed into the outer thread 46 of the tie rod 14 in the area of the deformation section 28, so that greater frictional contact is established between the inner nut part 20 and the end 15 of the tie rod 14. The increased frictional contact leads to the nut 19 being clamped on the end 15 of the tie rod 14. Fig. 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 securing of the nut 19 is in Fig. 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 inner nut part 20 and the securing projections 44 of the clamping part 21 protrude in the axial direction 38 over the end face 50 of the tie rod 14. The securing element 51 has an arm 54 directed outwards in the radial direction 53, which protrudes between the ends of the longer projections 29a of the deformation section 28 of the inner nut part 20 and the securing projections 44 of the clamping part 21 and forms a lock by means of a form fit, which rotates against one another prevented from clamping part 21 to inner nut part 20.

List of reference signs

100

pull bar

10

Central buffer coupling

11

casing

12th

Tie rod head

13th

Tie rod eye

14th

Tie rod

15th

end

16

opening

17th

ground

18th

Draw tube

19th

mother

20th

Mother's inner part

21

Clamping part

22nd

flange

23

Flange of the nut inner part

24

paragraph

24a

Sliding bush

25th

cover

26th

Pull rod

27

Spring package

28

Deformation section

29a

head Start

29b

head Start

30th

edge

31

Recess

32

Inner bore

33

Material rejuvenation

34

Base

35

ground

36

Outside

37

External thread

38

Axial direction

39

inner thread

40

Inner bore

41

Groove

42

Print section

43

edge

44

Securing protrusions

45

inner thread

46

External thread

47

Groove

48

Outer conical surface

49

Inner conical surface

50

Front side

51

Fuse element

52

screw

53

Radial direction

54

poor

300

coupling

Claims (14)

Tie rod (100), in particular for a central buffer coupling (10) of a rail vehicle, comprising a tie rod (14) and a tie rod (18), the tie rod (14) being connected to the tie tube (18) by means of a screw connection, the screw connection being a comprises nut (19) screwed onto the end of the tie rod (14), characterized in that the nut (19) is constructed in two parts and comprises an inner nut part (20) and a clamping part (21), the clamping part (21) being attached to the inner nut part ( 20) is placed and the inner nut part (20) is clamped with the tie rod (14). Tie rod (100) according to Claim 1, characterized in that the inner nut part (20) has an internal thread (45) and is screwed onto an external thread (46) of the tie rod (14), and / or that the clamping part (21) has an internal thread ( 39) and is screwed onto an external thread (37) of the inner nut part (20). Pull rod (100) according to claim 1 or 2, characterized in that the inner nut part (20) has a deformation section (28) at the end, and that the clamping part (21) has a pressure section (42) at the end, the pressure section (42) exerting a force exerts on the deformation section (28), so that the deformation section (28) is elastically deformed and pressed against the tie rod (14). Tie rod (100) claim 2 or 3, characterized in that the internal thread (45) of the inner nut part (20) in the area of the deformation section (28) is pressed into the outer thread (46) of the tie rod (14), so that the frictional force between the inner nut part (20) and tie rod (14) is increased. Pull rod (100) according to Claim 3 or 4, characterized in that the pressure section (42) has an inner conical surface (49) and / or that the deformation section (28) has an outer conical surface (48). Pull rod (100) according to one of claims 3 to 5, characterized in that the deformation section (28) has at least one recess (31) at the end, in particular a notch or an incision, and / or that the deformation section (28) at the end has at least one Has projection (29a, 29b), in particular a lamella or a tab, wherein the projection (29a, 29b) preferably comprises the outer conical surface (48). Pull rod (100) according to claim 6, characterized in that the deformation section (28) has at least two, preferably at least five, more preferably at least ten, particularly preferably exactly ten, recesses (31) at the end, and / or that the deformation section (28) at the end has at least two, preferably at least five, more preferably at least ten, particularly preferably exactly ten, projections (29a, 29b), the projections (29a, 29b) being very particularly preferably of different lengths. Drawbar (100) according to one of the preceding claims, characterized in that the inner nut part (20) has a, preferably circumferential, material taper (33), the material taper (33) preferably on a bottom (35) of the recess (31) and / or is arranged on a base (34) of the projection (29a, 29b), the material taper (33) particularly preferably being a groove (47), the groove (47) particularly preferably being arranged circumferentially on the inside in the inner nut part (20) is. Tie rod (100) according to one of the preceding claims, characterized in that a securing element (51) is arranged on the end of the tie rod (14), in particular fastened with a screw (52), the securing element (51) being designed to rotate of clamping part (21) with respect to the inner nut part (20), the clamping part (21) preferably having securing projections (44) at the end, the securing element (51) having an arm (54), the arm (54) being 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). Drawbar (100) according to one of the preceding claims, characterized in that the inner nut part (20) has a flange (23), the flange (23) resting on an inwardly directed flange (22) of the drawtube (18), the The flange (23) of the inner nut part (20) is preferably hexagonal. Nut (19) for connecting a tie rod (14) of a tie rod (100) to a tie tube (18) of the tie rod (100) comprising an inner nut part (20) and a clamping part (21). Coupling (300), in particular central buffer coupling (10), for a rail vehicle with a drawbar (100) according to one of Claims 1 to 10. Rail vehicle with a coupling (300) according to Claim 12. Method for connecting a tie rod (14) of a tie rod (100) to a tie tube (18) of the tie rod (100) using a nut (19) according to claim 11, wherein one end (15) of the tie rod (14) passes through an opening ( 16) of the draw tube (18), the inner nut part (20) being screwed onto the end (15) of the tie rod (14) and tightened until the connection is free of play, the inner nut part (20) being at least temporarily secured against twisting, for example, is held, the clamping part (21) being screwed onto the inner nut part (20) so that the inner nut part (20) is clamped to the end (15) of the tie rod (14).

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