Cross member for a bogie and method for manufacturing the cross member

Abstract

The invention relates to a cross member (1) for a bogie (7) in a construction which is advantageously in accordance with a fiber composite but is easy to implement, and to a particularly simple method for producing the cross member. The cross member is designed as a hollow chamber profile from a fiber plastic composite and has at least three hollow chambers (2) arranged side by side, which are connected via at least one outer fiber layer, wherein the outer fiber layer at least partially covers at least the faces (41, 42) of the cross member (1) which are not provided for arranging side elements (73) of the bogie. The production of the cross member (1) takes place by producing at least three elongate hollow profiles from a fiber plastic composite and by winding an arrangement consisting of the hollow profiles with an outer fiber layer.

Description

Technical Field

[0001] The present invention relates to a crossbeam for a bogie having at least two wheel sets which can be connected to the crossbeam via side elements, a bogie having the crossbeam, a method for manufacturing the crossbeam and a use of the crossbeam. Background Art

[0002] If the wheelset is supported in a frame that can rotate relative to the car body, the running gear of a rail vehicle is called a bogie. The bogie frame usually has two longitudinal beams arranged perpendicular to the axis of the wheelset, which are connected to the wheelset and respectively to one or more crossbeams, for example by means of a suspension (H-type). Other parts of the bogie, such as suspension and damping devices, as well as motor elements, transmission elements, and brake elements, can be arranged on the frame. Usually, the car body is connected to at least one of the crossbeams of the bogie via a king pin, with the king pin also transmitting the longitudinal forces of the car body to the crossbeam or crossbeams.

[0003] In bogies of steel construction, the embodiment of the crossbeam as a box-shaped welded structure is known, for example, from EP 2 386 454 A1. EP 0 857 635 A2 discloses a bogie having a frame consisting of two crank-like longitudinal beams of box construction and two tubular crossbeams.

[0004] There are also different options for bogies that correspond to the fiber composite construction.

[0005] For example, DE 36 12 797 C1 discloses a bogie of fiber composite construction having a double H-frame, ie, two transverse beams between longitudinal beams. The transverse beams are connected to torsionally elastic plates, which must have multiple different fiber orientations.

[0006] DE 36 12 176C2 discloses a bending beam, in particular a bending beam for a bogie frame of a rail vehicle, the bending beam being composed of a fiber composite structure which is relatively resistant to bending at least in the center of the bending beam and is elastically constructed at the end sections of the bending beam, the fiber composite structure having an upper fiber bundle and a lower fiber bundle, the upper fiber bundle and the lower fiber bundle being constructed as an upper band and a lower band having a fiber direction which is unidirectional in the longitudinal direction of the beam and extending over the entire length of the bending beam, and the fiber composite structure having a fiber composite core arranged as a spacing member between the fiber bundles, the fiber composite core being composed of fiber composite push connecting plates having a fiber orientation inclined relative to the longitudinal direction of the beam and distributed in a sheet-like manner over the width of the bending beam, and a support body arranged between the push connecting plates.

[0007] In EP 0 031 008 A1, the H-shaped frame is a monolithic, relatively complexly shaped fiber composite structure.

[0008] DE 10 2017 102 561 A1 discloses an arrangement for attaching a crossbeam for accommodating a center pin to two lower longitudinal beams of a car part for a rail vehicle.

[0009] Furthermore, AT 51 77 94 B1 discloses a fastening device of a device beam and a car of a rail vehicle, wherein the car is equipped at its underside with a C-channel, wherein the device beam is detachably connected with at least one elastic connection part at the C-channel of the car. SUMMARY

[0010] The object of the present application is to specify a crossbeam for a bogie in a construction which is advantageously in accordance with fiber composites but is easy to implement, and a particularly simple method for manufacturing the crossbeam.

[0011] The object is achieved by a crossbeam for a bogie having the features of claim 1, a bogie with a crossbeam according to claim 4 and a method for manufacturing a crossbeam having the features of claim 6. The present application also relates to the use of a crossbeam according to claim 10. Improvements of the present application are specified in the dependent claims.

[0012] A crossbeam for a bogie according to the present application is composed of a hollow chamber profile of a fiber plastic composite and has at least three hollow chambers arranged side by side, the bogie having at least two wheelsets which can be connected with the crossbeam via side elements, the hollow chambers being connected with one another via at least one outer fiber layer, wherein the outer fiber layer at least partially covers at least the faces of the crossbeam which are not provided for arranging the side elements.

[0013] Advantageously, the embodiment according to the present application of the crossbeam as a monolithic component improves the overall rigidity of the bogie.

[0014] The crossbeam according to the present application is suitable for different construction forms of bogies, in particular for different construction forms of bogies of rail vehicles. The crossbeam can be connected with a car of a rail vehicle via a center pin, for example. The side elements of the bogie can be arranged at at least two opposite faces of the crossbeam, wherein at least one side element can be arranged at one of the side faces, respectively. The side elements are arranged transversely to the crossbeam in the bogie and can be longitudinal beams or shaft levers or spring elements, for example, plate springs, which are connected with the crossbeam in a hinged manner.

[0015] The crossbeam is configured as a hollow chamber profile of a fiber plastic composite, wherein, in the sense of the application, a fiber plastic composite (FKV) is a composite material which comprises reinforcing fibers, such as carbon fibers, glass fibers, aramid fibers, etc., embedded in a plastic matrix.

[0016] In the sense of the application, an elongated or plate-shaped component, i.e. a component which has significantly greater dimensions in one or two spatial directions than in the spatial direction(s) perpendicular to said one or two spatial directions, is referred to as a hollow chamber profile, the internal volume of which is not completely filled with material, for example with the material of the outer wall, whereas in the case of said component, material is arranged in the internal volume in the manner of a web between two generally oppositely disposed faces.

[0017] Preferably, the crossbeam is a geometric body in the shape of a cuboid. However, the crossbeam can also be configured entirely generally prismatic.

[0018] The crossbeam as a hollow chamber profile has at least three hollow chambers which are arranged side by side. The hollow chambers are elongated, i.e. they have greater dimensions, in particular significantly greater dimensions, for example more than twice as great, in one spatial direction than in the other two spatial directions. The dimension in said spatial direction is referred to below as the length of the hollow chamber, correspondingly also as the length of the crossbeam. The hollow chambers are arranged side by side, i.e. following one another in the spatial direction, such that the side faces of the hollow chambers which have at least one edge of the length are in each case in contact with one of the side faces of the hollow chamber arranged next to it. In other words, the hollow chambers are arranged following one another in a direction which, in the state in which the crossbeam is fitted in the bogie, corresponds to the set direction of travel of the bogie.

[0019] If the crossbeam is arranged in the bogie, the length of the crossbeam is thereby the dimension transverse to the set direction of travel. Here, the length of the crossbeam is associated with the spacing of the side elements arranged at the same wheel set from one another which are opposite one another. The side elements of the bogie are arranged at a face whose edges are not oriented in the spatial direction associated with the length.

[0020] In said sense, the dimension of the crossbeam in the spatial direction perpendicular to the length, i.e. in the spatial direction in which the hollow chambers are not arranged side by side, is referred to as the height of the crossbeam. If the crossbeam is arranged in the bogie, the height is oriented in the spatial direction which is essentially perpendicular to the floor. The dimension in the spatial direction perpendicular to both the spatial direction of the length and the spatial direction of the height is referred to as the width of the crossbeam. If the crossbeam is arranged in the bogie, the width is the dimension of the crossbeam in the set direction of travel.

[0021] Due to the side-by-side arrangement of at least three hollow chambers, the cross member is designed as a hollow chamber profile with at least two webs, which are oriented substantially in a spatial direction associated with the length.

[0022] A crossbeam designed as a hollow-chamber profile generally has two open outer faces, i.e., faces through which the interior volume of a single hollow chamber is accessible. A top view of each of these outer faces shows at least three hollow chambers separated from one another by webs. Individual or all of these hollow chambers can be closed by closure elements that can be fastened to the open faces. The outer faces of the crossbeam, unlike the open outer faces, are closed faces, through which the interior volume of the crossbeam is accessible only via cutouts introduced into the outer faces. Advantageously, the open outer faces of the crossbeam correspond to the faces provided for accommodating the side elements of the bogie. This allows bogie components, which would otherwise need to be removed from the crossbeam for attachment to other bogie components, to be arranged in a particularly space-saving manner within the hollow chambers of the crossbeam.

[0023] The hollow chamber of the cross-beam may have the same cross-section as the second hollow chamber of the cross-beam, or a cross-section that is different from the cross-section of the second hollow chamber of the cross-beam.

[0024] By arranging the hollow chambers side by side, two faces of the crossbeam are created. These two faces consist of the corresponding closed outer faces of the hollow chambers plus twice the thickness of the outer fiber layer, so that the area of ​​these two faces substantially corresponds to the sum of the areas of the corresponding closed outer faces of the hollow chambers arranged side by side. These faces of the crossbeam are hereinafter referred to as the bottom face. If the crossbeam is a cuboid, the edges of the bottom face correspond to the length and width of the crossbeam.

[0025] The two bottom surfaces of the cross member can each be formed as a flat or curved surface, or can consist of flat or curved partial surfaces that can be oriented at angles different from 0° to one another, wherein the partial surfaces can each be, for example, the outer surfaces of a hollow chamber. However, the bottom surface has no steps or offsets between the outer surfaces of the individual hollow chambers.

[0026] The at least three hollow chambers of the crossbeam, when arranged one behind the other, are connected to one another by at least one outer fiber layer, wherein the outer fiber layer at least partially covers at least the surfaces of the crossbeam not intended for accommodating side elements, in particular the bottom surface of the crossbeam and closed surfaces not intended for accommodating side elements. In this sense, the outer fiber layer at least partially covers the surfaces of the crossbeam; the outer fiber layer is arranged on all of the aforementioned surfaces, but not necessarily each of the surfaces is completely covered by the outer fiber layer. Preferably, the area of ​​the surface covered by the outer fiber layer is larger, in particular significantly larger, than the uncovered area.

[0027] Preferably, the face provided for the arrangement of the side elements is not covered by the outer fiber layer.

[0028] Assuming a cuboid crossbeam, the outer fiber layer at least partially covers at least the two surfaces formed by the length and width and the two surfaces formed by the length and height.

[0029] In one embodiment of the cross member according to the invention, one of the at least three hollow chambers of the cross member, for example the middle hollow chamber of the three hollow chambers, is designed completely or partially as a compressed air reservoir. In particular, in this embodiment, the cross member is designed such that the at least one hollow chamber can be closed at least on the surface of the cross member intended for attachment to the side elements. The compressed air reservoir can be used to supply compressed air to the air springs used for the secondary suspension of the carriage body.

[0030] In another embodiment, at least one outer fiber layer of the crossbeam is formed from continuous fiber rovings and / or fabrics embedded in a solidified plastic matrix. Continuous fiber rovings are defined as bundles, bundles, or multifilaments of largely parallel continuous fibers. Fabrics are understood to be semi-finished fiber products produced by interweaving continuous fibers.

[0031] Another aspect of the invention relates to a bogie for a rail vehicle, which has at least two wheel sets, which are connected to a crossbeam according to the invention consisting of FKV via side elements, the crossbeam being designed as a hollow chamber profile, wherein at least three hollow chambers of the crossbeam extend parallel to the wheel sets of the bogie and are arranged side by side in a direction parallel to the direction set as the travel direction of the bogie.

[0032] Advantageously, a bogie of this type of construction has a high potential for lightweight construction with improved overall rigidity.

[0033] The main suspension of the bogie relative to the wheel or wheelset is preferably provided by means of at least two torsion bars arranged parallel to the axle of the wheelset. Each of the torsion bars can be arranged in a space-saving manner in a hollow chamber of the crossbeam and pass through the crossbeam at its open face for attachment to the wheelset, for example via an axle lever. Each of the torsion bars can be partially connected to the crossbeam in a torsionally fixed manner.

[0034] Another aspect of the invention relates to a method for producing a crossbeam for a bogie, the method comprising at least the following method steps:

[0035] a) producing at least three elongated hollow profiles from a fiber-plastic composite, wherein a first of the hollow profiles has an elongated first side surface which is designed such that a second of the hollow profiles can be arranged with a positive fit on the first side surface of the first hollow profile using the elongated first side surface of the second hollow profile, and the second hollow profile has an elongated second side surface which is designed such that a third of the hollow profiles can be arranged with a positive fit on the second side surface of the second hollow profile using the elongated first side surface of the third hollow profile;

[0036] b) positively arranging a first side surface of the first hollow profile on a first side surface of the second hollow profile, and positively arranging a second side surface of the second hollow profile on a first side surface of a third hollow profile of the hollow profiles, such that the resulting bottom surface of the arrangement has no step;

[0037] c) Winding the arrangement according to method step b) with at least one fiber layer formed from a fiber semi-finished product pre-impregnated with a matrix material for producing a crossbeam, wherein the fiber layer at least partially covers a bottom surface of the arrangement and a second side surface of the first hollow profile extending elongately and different from the first side surface and a second side surface of the third hollow profile extending elongately and different from the first side surface, and curing the matrix material of the at least one fiber layer.

[0038] For the purposes of the present invention, an elongated hollow profile is a hollow profile that has a larger dimension, particularly a significantly larger dimension, such as more than twice as large, in one spatial direction than in the other two spatial directions. Such hollow profiles generally have a quadrilateral cross-section in a plane perpendicular to the length, particularly a trapezoidal, parallelogram-shaped, or rectangular cross-section. The cross-sections of the hollow profiles forming the crossbeams can be identical or different in terms of both area and shape.

[0039] On the two faces that delimit the hollow profile and whose edges are not longitudinal, the hollow profile is open, meaning its interior volume is accessible. On the remaining faces, the hollow profile is closed, meaning its interior volume is accessible only via cutouts introduced into the faces. The faces referred to as the side faces of the hollow profile are each one of these closed faces.

[0040] The hollow profile is designed so that two of the hollow profiles can be arranged side by side in a form-fitting manner, wherein the corresponding side surfaces are in contact with each other, more precisely, each of the two arranged surfaces is a flat or slightly curved surface, and the two surfaces are composed of two side surfaces of the hollow profile that are arranged side by side, so that the area of ​​the two surfaces corresponds to the sum of the areas of the corresponding side surfaces, and the flat or slightly curved surfaces can be composed of flat or slightly curved partial surfaces, which can be arranged at an angle different from 0° to each other, but there is no step or offset between the two side surfaces of the hollow profile. The other hollow profile is designed so that one of its side surfaces can be arranged in a form-fitting manner on a side surface of the arrangement that is not part of the bottom surface of the arrangement and therefore not part of one of the side surfaces of one of the hollow profiles in the arrangement, so that the resulting bottom surface of the arrangement is a flat or slightly curved surface, the bottom surface being formed by each of three side surfaces of the hollow profile arranged side by side, so that the area of ​​the bottom surface corresponds to the sum of the areas of the corresponding three side surfaces. The flat or slightly curved surface can be formed by flat or slightly curved partial surfaces, which can be arranged at angles different from 0° to each other, without any steps or offsets between the three side surfaces of the hollow profile. If the crossbeam to be produced includes more than three hollow chambers, the further hollow profile is produced and arranged in a manner corresponding to the number of hollow chambers according to the above embodiment.

[0041] In one embodiment of the method according to the present invention, at least one, and preferably all, of the hollow profiles are produced in method step a) using a filament winding technique (monofilament winding). When winding the hollow profile, the carbon continuous fiber rovings can be deposited on a winding core, for example. The winding core can have winding needles at its ends to allow the fibers to be easily deflected without slipping. For example, epoxy resin can be used as the matrix material, and the fibers can be impregnated with the epoxy resin after winding. The matrix material of the hollow profile is subsequently cured.

[0042] In method step c), an arrangement of at least three hollow profiles with a smooth base is wound with a pre-impregnated fiber semi-finished product having at least one layer of reinforcing fibers, such as carbon fibers, so that at least all closed surfaces of the arrangement are at least partially covered by an outer fiber layer. The fibers of the fiber semi-finished product are pre-impregnated, i.e., already impregnated with an uncured matrix material of the FKM composite, such as a reaction resin.

[0043] The winding of the arrangement of at least three hollow profiles is preferably performed using pre-impregnated continuous fiber rovings and / or pre-impregnated fabrics. In one embodiment of the method according to the invention, the winding with more than one fiber layer is performed by winding with more than one prepreg mat with an offset joint, wherein the prepreg fibers are preferably present as a fabric. Particularly preferably, the winding can be performed using multiple prepreg fabric mats arranged with an offset joint, using both fabrics with a fiber angle of + / - 45° and fabrics with a fiber angle of 0° / 90°.

[0044] The individual production of the hollow profiles and the subsequent winding for producing the crossbeam according to the invention advantageously allows the desired mechanical properties of the individual hollow profiles and the entire crossbeam to be adjusted in a load-adapted manner. In particular, the desired final wall thickness of the crossbeam can be achieved in a particularly simple manner through the winding method step. The method according to the invention is considered particularly economical in terms of lightweight construction, as large amounts of material can be processed in a short time.

[0045] In another embodiment, the method according to the invention has a further method step, which follows method steps a) to c). Method step d) includes machining the crossbeam to introduce at least one recess in at least one of its surfaces. The recess is used, in particular, to fasten components of the bogie to the crossbeam.

[0046] Another aspect of the invention relates to the use of a crossbeam according to the invention for a bogie with a torsion bar main suspension. Such a bogie can in particular have at least two torsion bars for suspending a wheel or wheelset relative to the bogie, said torsion bars being arranged in a space-saving manner in each of the at least three hollow chambers of the crossbeam and being locally connected to the crossbeam in a rotationally fixed manner.

[0047] In the scope of this specification, the term "at least one" is used in a concise sense and may refer to: one, exactly one, a plurality (e.g., exactly two or more than two), a number (e.g., exactly three or more than three), etc. Here, "plurality" or "many" does not necessarily mean that there are multiple or many identical elements, but rather refers to multiple or many elements with the same basic function.

[0048] The invention is not limited to the embodiments shown and described, but also includes all embodiments having the same effect within the meaning of the invention. Furthermore, the invention is not limited to the specifically described feature combinations, but can also be defined by any other combination of specific features of all individual features disclosed as a whole, as long as the individual features do not exclude each other or specific combinations of individual features are not explicitly excluded. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The invention is explained below by means of exemplary embodiments with reference to the drawings, without being restricted to these exemplary embodiments.

[0050] Shown here

[0051] Figure 1a The crossbeam is shown in a perspective view,

[0052] Figure 1b Showing the bottom surface of the beam,

[0053] Figure 1c Showing the side of the beam,

[0054] Figure 1d Shows the open face provided for arranging the side elements of the bogie, and

[0055] Figure 2 A bogie with a torsion bar main suspension is shown in a perspective view, said bogie having a cross member. DETAILED DESCRIPTION

[0056] Figure 1a A rectangular parallelepiped cross member 1 is shown, which is designed as a hollow chamber profile with three hollow chambers 2. The hollow chambers are elongated and have a significantly greater extension in the longitudinal direction 31 than in the width direction 32 and in the height direction 33. The cross member is plate-shaped in this respect, since its extension in the longitudinal direction 31 and in the width direction 32 is significantly greater than in the height direction 33. The cross member 1 has two parallel, flat bottom surfaces 41, one of which is located at Figure 1a The bottom surface 41 is formed by the arrangement of three hollow chambers 2 in the width direction 32. In addition, the cross member 1 has two closed side surfaces 42 parallel to each other, one of which is located at the bottom surface. Figure 1a As can be seen, it also has two parallel open faces 43. The open faces 43 form side elements (not shown) for arranging a bogie, into which the crossbeam can be placed. The hollow chambers 2 are delimited by webs 5, which are formed by the walls of the hollow profile from which the crossbeam 1 is manufactured.

[0057] The bottom surface 41 and the side surfaces 42 are covered by an outer fiber layer (not shown).

[0058] The cross member 1 has a plurality of cut-outs introduced into its faces 41, 42 after its manufacture in a manner cut. The large cut-out 61 is an accommodation for a central pin (not shown). On the left and right of the cut-out 61 in the longitudinal direction 31 and at the open face 43, a closure element (not shown) can be arranged in or at the middle hollow chamber 21, which completely covers the cross section of the middle hollow chamber 21 and divides the hollow chamber 21 into two isolated partial volumes. The two partial volumes can be used as compressed air reservoirs for supplying compressed air to air springs (not shown) arranged on the bottom face 41. The holes 62 are used for fastening different components (not shown) of the bogie. In the quadrangular hole 63, for releasably fastening, for example, a transmission and / or motor and / or brake equipment components (not shown) associated with the bogie, a quadrangular, thus torsion-proof, insert 631 is inserted, which has a threaded hole. This allows an optimized load introduction for the FKV component.

[0059] Figure 1b The cross member 1 is shown in a top view of one of the two parallel bottom faces 41, which are bounded in the longitudinal direction 31 and in the width direction 32 by edges, respectively. The bottom faces are covered with a fiber layer (not shown). The cut-out 61 and different holes 62 are introduced in the bottom faces.

[0060] Figure 1c The cross member 1 is shown in a top view of one of the two parallel side faces 42, which are bounded in the longitudinal direction 31 and in the height direction 33 by edges, respectively. The side faces are covered with a fiber layer (not shown). Different holes 62 and a quadrangular hole 63 with a quadrangular insert 631 are introduced in the bottom faces.

[0061] Figure 1d The cross member 1 is shown in a top view of one of the two open faces 43, which are bounded in the width direction 32 and in the height direction 33 by edges, respectively. Through the open faces 43, the inner volume of the three hollow chambers 2 can be accessed. The middle hollow chamber 21 is used as a compressed air reservoir in a closed state, wherein a cut-out 64 for a condensate drain bolt is provided. The three hollow chambers 2 are delimited from each other by the web 5.

[0062] Figure 2A bogie 7 with a torsion bar main suspension is shown, comprising a crossbeam 1. The bogie 7 has two wheelsets 71, whose axes 711 are aligned parallel to the longitudinal direction 31 of the crossbeam 1. Torsion bars 72 are arranged within the interior volume of the two outer hollow chambers (covered) of the hollow chamber of the crossbeam 1. These torsion bars are guided out of the crossbeam at the open face 43 and are connected in a rotationally fixed manner to side elements in the form of spring lever arms 73 at their respective ends projecting beyond the crossbeam 1. Each spring lever arm 73 engages a bearing 712 of a wheelset 71. The central hollow chamber in the hollow chamber of the crossbeam 1 serves as a compressed air reservoir and is therefore sealed at the open face 43 by a plate 22 in the shape of its cross section.

[0063] Reference Signs List

[0064] 1 beam

[0065] 2 hollow chambers

[0066] 21 middle hollow chamber

[0067] 22 boards

[0068] 31 vertical direction

[0069] 32 width direction

[0070] 33 height direction

[0071] 41 Bottom

[0072] 42 side

[0073] 43 open face

[0074] 5 belly plate

[0075] 61 is used for the center pin of the blank

[0076] 62 holes

[0077] 63 quadrilateral holes

[0078] 631 Quadrangular insert with thread

[0079] 64 Recess for condensate drain bolts

[0080] 7 Bogie

[0081] 71 wheels

[0082] 711 shaft

[0083] 712 bearings

[0084] 72 torsion rod

[0085] 73 spring lever arm

Claims

1. A crossbeam (1) for a bogie (7), the bogie having at least two wheel sets (71), which can be connected to the crossbeam (1) via side elements (73), characterized in that The cross member (1) is designed as a hollow chamber profile made of a fiber-plastic composite and has at least three hollow chambers (2) arranged side by side, which are connected via at least one outer fiber layer, wherein the outer fiber layer at least partially covers at least the surfaces (41, 42) of the cross member (1) that are not provided for arranging the side elements (73).

2. The crossbeam (1) according to claim 1, characterized in that One of the at least three hollow chambers (21) is designed as a compressed air reservoir.

3. The crossbeam (1) according to claim 1 or 2, characterized in that The at least one outer fiber layer is formed from continuous fiber rovings and / or fabrics.

4. A bogie (7) for a rail vehicle, the bogie having at least two wheel sets (71), which are connected to a crossbeam (1) according to any of the preceding claims via side elements (73), wherein at least three hollow chambers (2) of the crossbeam (1) extend parallel to the wheel sets (71) of the bogie (7) and are arranged side by side in a direction (32) parallel to the set travel direction of the bogie (7).

5. The bogie (7) according to claim 4, characterized in that At least one torsion rod (72) is arranged in the inner volume of at least two of the at least three hollow chambers (2) of the crossbeam (1), wherein the torsion rod is locally connected to the crossbeam (1) in a rotationally fixed manner, wherein the end region of the torsion rod (72) protrudes from the crossbeam (1) and is respectively connected to a side element (73) acting on the wheel set (71) in a rotationally fixed manner.

6. A method for producing a crossbeam (1) for a bogie (7), comprising at least the following method steps: a) producing at least three elongated hollow profiles from a fiber-plastic composite, wherein a first of the hollow profiles has an elongated first side, which is designed such that a second of the hollow profiles can be arranged with a positive fit on the first side of the second hollow profile with the elongated first side of the second hollow profile, and the second hollow profile has an elongated second side, which is designed such that a third of the hollow profiles can be arranged with a positive fit on the second side of the second hollow profile with the elongated first side of the third hollow profile; b) arranging the first side surface of the first hollow profile in a form-fitting manner on the first side surface of the second hollow profile, and arranging the second side surface of the second hollow profile in a form-fitting manner on the first side surface of the third hollow profile, so that the resulting bottom surface (41) of the arrangement has no step; c) winding the arrangement according to method step b) with at least one fiber layer formed from a fiber semi-finished product pre-impregnated with a matrix material for producing a crossbeam (1), wherein the fiber layer at least partially covers the bottom surface (41) of the arrangement and a second side surface (42) of the first hollow profile extending elongately different from the first side surface and a second side surface (42) of the third hollow profile extending elongately different from the first side surface, and curing the matrix material of the at least one fiber layer.

7. The method according to claim 6, characterized in that In method step a), at least one of the hollow profiles is produced using a fiber winding technique.

8. The method according to claim 6 or 7, characterized in that In method step c), winding with offset joints is carried out using a plurality of layers each formed from a prepreg mat.

9. The method according to claim 6 or 7, characterized in that The method is followed by method step d) comprising the following: d) machining the crossbeam (1) in a cutting manner in order to introduce at least one recess (61, 62, 63, 64) into at least one of the surfaces (41, 42) of the crossbeam (1).

10. Use of a crossbeam (1) according to any one of claims 1 to 3 for a bogie (7) with a torsion bar main suspension.

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