EP3227157B1 - Chassis frame of a rail vehicle with a ttansverse beam - Google Patents

Description

Technical field

The invention relates to a chassis frame of a rail vehicle with a cross member for connecting two longitudinal members of the undercarriage frame, the cross member being box-shaped with an upper chord, a lower chord and two side walls and, seen in a longitudinal direction, each end having a connecting section for connection to one of the longitudinal members.

State of the art

Trolleys, also called bogies, of rail vehicles generally have two wheel sets which are guided on rails and are connected to car bodies of the rail vehicle. An essential component of a chassis is a chassis frame, to which the wheel sets are connected, for example via a wheel set guide or primary suspension, and the car body, for example, via a secondary suspension and a device for power transmission. The power flows between the individual components mainly run via the chassis frame.
The undercarriage frame usually comprises two side members and one or more cross members, the variant with a cross member being referred to as an H-type. The longitudinal beams can also be designed as a frame closed by means of head beams.

In the H design, the cross member is designed as a box-shaped profile and comprises an upper chord, a lower chord and two side walls, each of which is composed of individual ones Sheets or plate-shaped metal parts exist. Seen in a longitudinal direction of the cross member, which corresponds to the transverse direction of the undercarriage frame, the cross member in each case has a connection section at its end, by means of which the cross member is connected to one of the longitudinal members via welds, for example fillet welds.

The individual elements of the crossbeam (top flange, bottom flange, side walls) are connected to each other at the edges by means of a continuous fillet weld, the fillet weld being welded on one side only due to the lack of accessibility. This creates open weld roots inside the crossmember, which are exposed to corrosion. For this reason, openings in the crossmember must be closed again for reasons of corrosion protection, or only blind hole threads that are difficult to repair can be used. In addition, the weld seams lead to stress concentrations in the area of the edges, which on the one hand increases the torsional stiffness of the chassis frame and on the other hand causes a large cross-section of the fillet welds and thus increases the overall weight of the cross member.

Another disadvantage of the prior art is that the chassis frame has a high torsional stiffness due to the design of the cross member described above. This worsens the running properties of the bogie on the one hand, in particular the derailment protection decreases, on the other hand the tensions in the weld seams in the connecting section between the longitudinal members and cross members increase. Since welds, in particular fillet welds, have only a low load capacity in relation to the cross section of the weld seams or the length of the weld seams, according to the prior art to compensate for the disadvantages mentioned above, only an increase in the weld seam cross-section or the weld seam lengths in the connection section is known, which is too elaborate constructions and in any case leads to increased weight. The technical environment is based on the documents FR 931 591 A and JP S57 88939 A referred.

Object of the invention

It is therefore an object of the invention to overcome the disadvantages of the prior art and to propose a cross member for a chassis frame which reduces the torsional rigidity of the chassis frame and in which a particularly favorable stress curve is established.

Presentation of the invention

This object is achieved by a chassis frame with the features of claim 1. Advantageous embodiments of the invention are defined in the respective dependent claims.

The invention relates to a chassis frame of a rail vehicle with a cross member for connecting two longitudinal members of the undercarriage frame, the cross member being box-shaped with an upper chord, a lower chord and two side walls and, seen in a longitudinal direction, each end having a connecting section for connection to one of the longitudinal members.

According to the invention, it is provided that the cross member is a bent part, a bending region being formed between the side walls and the top flange and between the side walls and the bottom flange.

Bent parts are produced in a bending process, also known as a bending process, by plastically deforming the raw body by introducing a bending moment into a flat raw body, the so-called unwinding or sheet metal development, and thus into a two- or three-dimensional one Is brought into shape. Suitable manufacturing processes are, for example, die bending or swivel bending. Those areas that are plastically deformed are called bending areas and are characterized by a homogeneous and favorable stress curve.

The cross member designed as a bent part, the bent part also being able to be composed of several bent sections, therefore has a particularly favorable stress curve, since instead of the edge between the upper flange and the side wall, which according to the prior art is connected by means of a weld seam, the bent region Upper flange and the first side wall connects. The same applies accordingly to the connection of the top flange and the second side wall, or bottom flange and the first and second side wall. The top flange and bottom flange or the side walls each relate to the non-plastically deformed, preferably flat, regions of the cross member. The bending areas relate to the respective plastically deformed, preferably curved, areas of the cross member.

Thanks to the favorable tension curve, the thickness of the sheet metal from which the crossbeam is made can be reduced and, on the other hand, fillet welds are no longer necessary for the connection, so that in comparison to the prior art, weight is saved and torsional rigidity is reduced . According to the invention, each longitudinal member has in its central section a longitudinal member connecting section which is connected to one of the connecting sections of the cross member. The inventive design of the cross member results on the one hand in a reduced torsional rigidity of the entire undercarriage frame and on the other hand in a significantly reduced overall weight of the undercarriage frame. Each side rail connection section has four straight, non-interconnected side rail connection edges, which are preferably arranged on the circumference of a rectangle, and are connected to the connection edges of the cross member via connection welds. Due to the rectilinear connection edges of the cross member, which are accessible through the upper and / or lower opening in the lateral surface of the cross member, counter-welded connection weld seams can be produced, which are designed as butt seams over the entire weld cross section.

In one embodiment variant of the invention, it is provided that the bending area is designed as a bending radius, the center of the bending radius in the interior of the cross member lies. This results in a particularly easy-to-produce shape of the cross member, which, in other words, in cross-section, normally seen in the longitudinal direction, corresponds to a rectangle with rounded corners, the curves being designed as circular radii. It goes without saying that instead of a bending radius also one Bending curvature with a different curvature profile can be provided, so that the bending area is shown in cross section, for example with an elliptical or general curve profile. It is advantageous if the bending area has a convex shape.

Since a closed cross-section on at least one cross-section normal to the longitudinal direction is not directly possible through the use of a bent part, an embodiment variant of a cross member according to the invention provides that the bent part or parts of the bent part each have two connecting sections for closing the bent part on the parallel to the longitudinal direction first edges. The first edges are those edges that are formed at the open ends of the bent part. In other words, these are those edges which run laterally in the development of the bent part and thus parallel to the length direction or do not form the frontal connection sections. The first edges face each other and are only a short distance apart, so that the connecting sections are formed. If the bent part is composed of several sections, with one section always extending over the entire length of the cross member in the longitudinal direction, each section has first edges at the open ends, which in the assembled state face the first edges of adjacent sections and so do the Form connecting sections.

In order to reduce the number of welds required to a minimum, the bent part is designed in one piece in accordance with a first embodiment of the invention. The box-shaped profile is thus formed by a single bent part, which only has to be connected by a single connecting weld seam, and thus achieves a particularly weight-saving construction of the cross member with a favorable stress curve.

In a further embodiment of the first embodiment variant it is provided that the bent part has a first connection section and a second connection section and that the first connection section is connected to the second connection section by a connection weld seam, preferably butt joint. Since the connecting sections lie opposite one another and thus butt against one another, the two connecting sections are connected by a connecting weld seam like a butt seam in which the entire cross section of the connecting weld seam has a load-bearing effect. The two connecting sections are accordingly “welded through” so that the connecting weld seam extends continuously from one side of the sheet to the other, that is to say the entire area between the top and bottom of the sheet is filled with welding material. It goes without saying that the first and / or the second connecting section can also be designed in a divided manner, that is, it does not extend continuously over the full length in the longitudinal direction of the cross member.

A preferred embodiment of the first embodiment variant provides that the connecting sections are designed as part of the lower flange and are preferably aligned symmetrically with respect to a width direction that is normal to the length direction. In terms of loading technology, it has proven to be particularly advantageous if the connecting sections or the first edges are formed by the lower flange. In particular, if the connecting sections are arranged symmetrically, that is to say divide the lower flange in the middle in the width direction, a connecting weld seam can be easily manufactured in terms of production technology. It is of course just as conceivable that the connecting sections are formed analogously by the upper flange.

Because the production of a one-piece box-shaped bent part in a single bending process is difficult to manufacture from a production point of view, a second embodiment variant of the invention provides that the bent part is constructed in several pieces and comprises at least a first part and a second part, at least one parting plane forming the parts being aligned parallel to the length direction. The multi-piece design of the bent part enables a much simpler production, since the box-shaped cross section can be assembled from several sections, each with open profiles, for example from two U-profiles or four edge profiles. By aligning the parting plane (with two sections) or the parting planes (with more than two sections) parallel to the length direction, it is ensured that no weld seams running parallel to the width direction are necessary to close the bent part.

In order to provide a bent part that is particularly easy to manufacture and at the same time has a high load-bearing capacity of the cross member, a preferred embodiment of the second embodiment variant provides that the bent part comprises exactly two sections, each section comprising a side wall and a part, preferably half, of the upper flange and the lower chord. The division into two sections, each comprising a side wall and a part of the upper and lower chord, enables the use of easy-to-produce U-profiles for the sections. In particular, the symmetrical division of the upper chord and the lower chord between the two sections enables simple assembly and a favorable tension curve.

According to a further embodiment of the second embodiment variant of the invention, each section has a first connecting section and a second connecting section, and the respective first connecting section of one of the sections is connected to the second connecting section of the adjoining section Connection weld, preferably butt weld, connected. Because each section in the development has a first edge on both sides, each section also has two connecting sections which are connected to the connecting sections of the adjacent sections. For example, in the case of two sections, the first connecting section ("right" edge) of the first section with the second connecting section ("left" edge) of the second section and vice versa is the first connecting section ("right" edge) of the second section with the second connecting section ( "left" edge) of the first section connected. If more than two sections are provided, the series can be continued analogously for any number of sections. As described above, the connecting sections butt each butt through the formed bending areas, so that a connecting weld seam, such as a butt weld, is provided for connecting the connecting sections, in which the entire weld cross section has a load-bearing effect. The two connecting sections are accordingly "welded through" again, as was explained at the beginning. Again, it goes without saying that at least one pair of the connecting sections can be made in several parts along the length direction, ie does not extend continuously over the full length of the cross member in the length direction.

A particularly preferred embodiment of the first and second embodiment variants provides that the connecting weld seams run outside the bending areas. By moving the connecting weld seams or the connecting sections into the less stressed areas of the cross member, for example to the middle of the upper flange, the middle of the lower flange or the center of the side walls, the required weld cross section and the required sheet thickness of the cross beam are further reduced.

A further reduction in the torsional stiffness of the cross member, which accordingly leads to a reduction in the Twist-stiffness of the undercarriage frame is achieved in that the cross member has openings on its outer surface, including upper flange, lower flange and the side walls, on at least two opposite sides of the outer surface. Through the openings through which the box-shaped cross member is open to the outside, i.e. the cavity inside the cross member is in communication with the environment, the torsional stiffness of the cross member, i.e. the resistance to twisting about a longitudinal axis of the cross member parallel to the longitudinal direction , significantly reduced. However, the twist stiffness only changes significantly when the openings take up at least 20% of the area of the upper chord or lower chord or the side walls. It goes without saying that the openings in the lateral surface are conceivable both for the first and for the second embodiment variant.

According to a preferred embodiment variant, the upper chord has at least one upper opening and the lower chord has at least one lower opening, at least the upper opening or the lower opening taking up at least 50% of the area of the upper chord or the lower chord. The top flange and bottom flange, the width of which is generally greater than the width of the side walls in a direction normal to the width and height direction, are particularly suitable for having large openings. It is advantageous if the upper or lower opening between 50% and 80%, preferably between 65% and 75%, and the other opening between 20% and 40%, preferably between 25% and 35%, of the surface of the upper flange or of the lower chord. Through the large opening, all welds of the cross member, i.e. both the connection welds and the connection welds for connection to the side members, can be counter-welded and post-treated, for example ground. This also solves the problem of corrosion so that the openings do not have to be closed. The fact that one of the two openings is smaller ensures that the cross member can guide the operating forces from one longitudinal member to the other longitudinal member via the respective upper flange or lower flange.

If the two side walls each have at least one side opening, the side opening of a side wall taking up at least 25% of the area of the respective side wall, the torsional stiffness is further reduced. While the upper and lower openings are usually designed as a single opening, it has proven to be advantageous if several side openings of approximately the same size are provided per side wall in order to guarantee an at least necessary torsional rigidity. At the same time, the total weight of the cross member is further reduced through the side openings.

In order to improve the connection of the cross member to the side members, in particular to reduce the necessary length of the connecting weld seams, a further preferred embodiment of a cross member according to the invention provides that the connection section provided for connection to one of the side members in the development of the bent part by a second edge of the bent part running normal to the longitudinal direction is formed, which runs in a straight line and is divided by interruptions. The interruptions serve to prevent a continuous connecting edge and to segment the second edge into individual parts which do not touch one another. This prevents the formation of a stress concentration at those points where two connecting edges meet according to the prior art.

The bending areas, at which the second edge is curved as seen in the longitudinal direction, are not suitable for connection to the side member, for example by means of a connection weld. It is therefore particularly advantageous if one in at least one bending area Interruption is arranged. This prevents the contact between two abutting connection edges on the one hand and the unfavorable curved course of the connection edges in the bending area on the other hand.

If the interruptions are arranged in all four bending areas, four interruptions are provided according to a further preferred embodiment which divides the second edge into an upper connecting edge of the upper chord, into a lower connecting edge of the lower chord and two lateral connecting edges of the side walls.

In a further particularly preferred embodiment variant of the invention, it is provided that at least one of the interruptions merges into a recess, the dimensions of the recess being larger than the dimensions of the interruptions. While the interruption itself can be made relatively small, since only the second edge has to be interrupted, the recess makes bending easier, so that no curls occur in the bending area. It has therefore proven to be particularly advantageous that the maximum extent of the recess in the width direction comprises at least the bending area and the maximum extent of the recess in the length direction between 25% and 75%, preferably between 33% and 66%, in particular between 40% and 60% , the maximum expansion in the width direction. If one considers the development of the bent part, the recesses are semicircular or semi-elliptical.

While an interruption, which approximately corresponds to the above-mentioned dimensions of the recess, is conceivable on its own, the combination of a small interruption with a relatively large recess has a further positive effect, in particular if the edge of the recess facing the second edge is parallel to the second edge runs. A further particularly preferred embodiment variant of the invention therefore provides that at least one end section of the adjacent connection edge adjoining the interruption is formed by a rod-shaped section of the element forming the respective connection edge. Since the connection edge is undercut by the recess and is separated from the next connection edge by the interruption, the connection edge or the element forming the connection edge, that is to say either the top flange, the bottom flange or one of the side walls, is not bent. This creates a rod-shaped section, which is determined by the distance between the connecting edge and the edge of the recess facing the second edge. The distance preferably corresponds at least to the thickness of the sheet which forms the bent part. In this way, the length of the connecting edges that can be used for a connecting weld seam is achieved in a simple manner, the connecting edges running in a straight line in order to obtain a high-quality and highly resilient weld seam.

Brief description of the figures

Fig. 1

eine axonometrische Ansicht einer ersten Ausführungsvariante eines erfindungsgemäßen Querträgers;

Fig. 2

eine axonometrische Ansicht einer Abwicklung des in Fig. 1 dargestellten Querträgers;

Fig. 3

eine axonometrische Ansicht einer zweiten Ausführungsvariante eines erfindungsgemäßen Querträgers;

Fig. 4

eine Draufsicht eines erfindungsgemäßen Fahrwerkrahmens;

Fig. 5

eine Schnittdarstellung gemäß Linie AA aus Fig. 4.

To further explain the invention, reference is made to the figures in the following part of the description, from which further advantageous refinements, details and developments of the invention can be found. The figures are to be understood as examples and are intended to illustrate the character of the invention, but in no way to narrow it down or even reproduce it conclusively. Show it:

Fig. 1

an axonometric view of a first embodiment of a cross member according to the invention;

Fig. 2

an axonometric view of a settlement of the in Fig. 1 illustrated cross member;

Fig. 3

an axonometric view of a second embodiment of a cross member according to the invention;

Fig. 4

a plan view of a chassis frame according to the invention;

Fig. 5

a sectional view along line AA Fig. 4 .

Implementation of the invention

Figure 1 shows a first embodiment of a cross member according to the invention with a box-shaped profile, wherein the cross section is normal to a longitudinal direction 5 of the cross member. In a chassis frame according to the invention, the length direction 5 corresponds to a transverse direction of the Undercarriage frame. The cross member comprises an upper flange 1, which faces a car body of a rail vehicle in the installed state, a lower flange 2, which faces the rails in the installed state, and a first side wall 3 and a second side wall 4, seen in the longitudinal direction 5, the left and right Form the side of the cross member. Viewed in the longitudinal direction 5, the cross member has a first connection section 7 at one end, that is to say, for example, at the front end, and a second connection section 8 at the opposite end, that is to say at the rear end. These connection sections 7, 8 serve to connect the cross member to a longitudinal member 38, 39. The connection sections 7, 8 in the present example are the open ends of the box-shaped cross member.

In order to achieve a favorable stress profile in the cross member, the cross member is designed as a bent part 9, in the present case as a one-piece bent part 9. The box-shaped profile of the crossmember is produced from a flat development by means of a corresponding manufacturing process, for example folding, swivel bending or die bending, in that the development is locally plastically deformed by means of an introduced bending moment, so that a three-dimensional shape is formed from the essentially two-dimensional development. Such a manufacturing process results in the following positive effect: since the bent part 9 is a single part which forms both the upper flange 1, lower flange 2 and the side walls 3, 4, only a single weld seam is required to make the box profile to manufacture.

The exact structure will now be explained in more detail using the example of the upper chord 1: at the transition between the upper chord 1, as the upper chord 1, only the flat part is subsequently viewed in each case, and the first side wall 3 forms a bending area 10 in that area, which was plastically deformed in the manufacturing process. Of the Bending area 10 represents a curved area, which in the present example is designed as a transition radius with a bending radius 11, as in FIG Figure 5 is clearly visible. The bending radius 11 is a circular radius, and curves with different curvature, for example ellipses, are also conceivable in alternative design variants. Likewise, a bending area 10 is also formed between the top chord 1 and the second side wall 4. Completely analogously, at the transition between the first side wall 3 and the lower flange 2 and between the second side wall 4 and the lower flange 2, a bending area 10 is formed in the same shape, so that the cross-section of the cross member normal to the length direction 5 has the shape of a rectangle, has rounded corners due to the bending radii 11 (see also Figure 5 ).

However, only a box-shaped body with two open ends can be produced by the bending process alone, in other words the cross section of the cross member is not yet closed. In Figure 2 a development, that is the flat raw body, for example sheet metal cutting, is shown before the bending process. It can clearly be seen that the development of the bent part 9 in a width direction 6, which is normal to the length direction 5, forms a first edge 14 on both sides (indicated by the dashed line), which runs parallel to the length direction 5. This forms on one side of the development of the bent part 9, in the illustration on the right side, a first connection section 16 and on the other side of the development of the bent part 9, the left side, a second connection section 17, via which the bent part 9, for example by a weld seam. The connecting sections 16, 17 are the end faces of the element forming the first edge 14, that is to say those flat surfaces which, seen in the width direction 6, form the first edges 14.

In the present exemplary embodiment, the lower flange 2 is designed so that one half, measured in the width direction 6, of the lower flange 2 is connected to the corresponding side wall 3, 4 via the bending region 10 which has not yet been deformed and is therefore flat. Therefore, the lower flange 2 forms the connecting sections 16, 17. Equally, however, it is equally conceivable that the upper flange 1 or one of the side walls 3, 4 is divided, the division naturally also being asymmetrical when viewed in the width direction 6. It can also be seen that the lower flange 2 has a lower opening 21, which in the development of the bent part 9 is also divided between the two halves of the lower flange 2, so that the connecting sections 16, 17 are seen in the longitudinal direction 5 on each side of the extend lower opening 21. In detail, the connecting sections 16, 17 are formed by T-shaped sections of the lower flange 2, the horizontal part of the Ts projecting in sections into the lower opening 21 in order to increase the length of the connecting sections 16, 17. On the other hand, the horizontal part of the Ts protrudes beyond the second edge 15.

If we now consider the bending part 9 in again Figure 1 , it turns out that the connecting sections 16, 17 are located opposite one another and in the immediate vicinity of one another, that is to say they even contact one another in extreme cases. In order to close the bent part 9, the two connecting sections 16, 17 are connected to one another by a connecting weld seam 18, which is designed as a butt seam. A power transmission with the full cross section of the connecting weld seam 18 is thus possible. The two connecting sections 16, 17 are accordingly “welded through” so that the connecting weld seam 18 extends continuously from one side of the sheet forming the bent part 9 to the other, that is to say the entire area between the top and bottom of the sheet is filled with welding material.

In order to further reduce the torsional stiffness of the cross member or the bent part 9, the upper flange 1 has an upper opening 20, the lower flange 2 has the lower opening 21 and each of the side walls 3, 4 has four side openings 22. To reduce the rigidity, it is necessary that the openings 20, 21, 22 each occupy at least 20% of the area of the corresponding element, that is to say the upper chord 1, the lower chord 2 or the side walls 3, 4. It is also conceivable that only upper and lower openings 20, 21 or side openings 22 are provided only on two opposite sides of the lateral surface of the bent part 9, comprising the upper chord 1, lower chord 2 and the side walls 3, 4. In addition to reducing the torsional stiffness, the openings 20, 21, 22 also result in a significant weight reduction of the entire cross member.

The upper opening 20 has a substantially rectangular shape, with roundings and constrictions in the shape, and is aligned symmetrically to the upper flange 1 both in the length direction 5 and in the width direction 6. The upper opening 20 takes up about 30% of the area of the upper chord 1.

The lower opening 21 is elliptical, is aligned both in the longitudinal direction 5 and in the width direction 6 symmetrically to the lower flange 2 and occupies approximately 75% of the area of the lower flange 2, so that the lower flange 2 has a lower shear stiffness than the upper flange 1.

The four side openings 22 are formed identically on both side walls 3, 4 and comprise a pair of circular and a pair of rectangular, rounded openings, which are related to the width direction 6 (cf. Fig. 2 ) are arranged symmetrically. Viewed in the longitudinal direction 5, the side openings 22 are distributed symmetrically from the center of the cross member, the rectangular openings being arranged closer to the center than the round ones. The total area of the four side openings 22 is approximately 35% of the area of a side wall 3.4.

With reference to Figure 2 The design of the connection sections 7, 8 will now be described below: Viewed in the longitudinal direction 5, the development of the bent part 9 has a second edge 15 at the end, that is to say on the front or rear side, which is normal to the longitudinal direction 5 or parallel extends to the width direction 6, a second edge 15 each forming one of the connection sections 7, 8. Since the second edge 15 would also plastically deform in the bending area 10 during the bending process, which would lead to a peripheral edge in the form of a rounded rectangle, the second edge 15 is divided into four areas by four interruptions 23, 24, 25, 26 which are directly assigned to the top flange 1, the bottom flange 2 and the side walls 3, 4.

The first interruption 23 and the second interruption 24 define a side connecting edge 29 of the first side wall 3, the second interruption 24 and the third interruption 25 an upper connecting edge 27 of the upper chord 1, the third interruption 25 and the fourth interruption 26 the lateral connecting edge 29 the second side wall 4 and the fourth interruption 26 and the first interruption 23 a lower connecting edge 28 of the lower flange 2. For this purpose, the interruptions 23, 24, 25, 26 are each arranged in the bending area 10 between the respective elements. It is also conceivable that the interruptions 23, 24, 25, 26 are arranged outside the bending area 10, in an area that corresponds to up to 25% of the width of the bending area 10, in order to achieve the same effect.

The interruptions 23, 24, 25, 26 each merge into a recess 30 which lies in the interior of the respective element. In the following, only the first interruption 23 is described in detail, since all of them Interruptions 23, 24, 25, 26 or the corresponding recesses 30 are of identical design. The first interruption 23 takes up only about 15% of a maximum extent of the bending region 10 in the width direction 6, up to 25% or even less than 15% being conceivable. The recess 30, on the other hand, is substantially larger, so that its maximum extent in the width direction 6 corresponds at least to the maximum extent of the bending region 10 in the width direction 6. The recess 30 is offset inwards parallel to the second edge 15, so that an inner edge of the recess 30 parallel to the second edge 15 is formed, and has a substantially semicircular shape, the corners of the semicircle being rounded.

In Figure 1 it can be seen how the recess 30 and the interruptions 23, 24, 25, 26 affect the shape of the connecting edges 27, 28, 29; in detail, due to the analog design, only the upper connecting edge 27 and the lateral connecting edge will be affected 29 of the first side wall 3 in the first connection section 7. The end section 31 of the upper connecting edge 27 adjoining the third interruption 25 is formed by a rod-shaped section 33 of the upper flange 1, which extends between the upper connecting edge 27 itself and the inner edge of the recess 30. The distance between the upper connecting edge 27 or the second edge 15 and the inner edge corresponds at least to the thickness of the sheet metal of the bent part 9. Thus, the rod-shaped section 33 of the upper flange 1 projects like a finger in the width direction 6, so that the entire upper connecting edge 27, too in the bending area 10, runs straight. Analogously to this, an end section 32 of the lateral connecting edge 29 of the first side wall 3 adjoining the second interruption 24 is formed by a rod-shaped section 34 of the first side wall 3.

The interruptions 23, 24, 25, 26 are in order for a longer rod-shaped section 33 to be obtained, in comparison with the rod-shaped section 34, that is to say that the upper chord 1 and lower chord 2 have the longest possible connecting edge 27, 28 Fig. 2 seen in the width direction 6 - provided at or near that end of the bending region 10 which borders on the side wall 3, 4. The recesses 30 are, however, approximately symmetrical to the bending region 10.

However, it is equally conceivable that, in a further alternative embodiment of the invention, the interruptions 23, 24, 25, 26 coincide with the recesses 30, so that straight connecting edges 27, 28, 29 are formed, but due to the lack of the end sections 31, 32 or the rod-shaped sections 33, 34 are significantly shorter and the bending areas 10 are not recorded.

Figure 3 shows a second embodiment of the invention, in which the bent part 9 is formed in several pieces, more precisely than a first section 12 and a second section 13. The two sections 12, 13 each have a U-shape and are divided by a parting plane 19 which runs along the length direction 5 and is normal to the width direction 6. The dividing plane 19 divides the upper chord 1 and the lower chord 2 exactly in half in the width direction 6, so that the first section 12 comprises the first side wall 3, one half of the lower chord 2 and the upper chord 1 and the second section 13 the second side wall 4 and each includes the other half of the lower chord 2 and upper chord 1.

Analogous to that in Figure 2 Development of the one-piece bent part 9 shown, the sections 12, 13 can also be unwound, each section 12, 13 having two first edges 14, each on the left or right side, which first edges 14 each have a first Form connection section 16 and a second connection section 17. In order to close the cross member, the two sections 12, 13 are therefore connected to one another at the connecting sections 16, 17 by a connecting weld 18 designed as a butt seam. More precisely, the first connecting section 16 of the first section 12 is connected to the second connecting section 17 of the second section 13 on the lower flange 2 and the first connecting section 16 of the second section 13 is connected to the second connecting section 17 of the first section 12 upper flange 1.

Otherwise, the second embodiment differs from the first only in the sense that the connecting weld seam 18 on the upper chord 1 is interrupted by the upper opening 20, just as the connecting weld seam 18 on the lower chord 1 is interrupted by the lower opening 21.

Of course, a further division of the bent part 9 into several sections, for example four sections, is also conceivable, each of which is connected to one another along the connecting sections 16, 17. In any case and regardless of the number of sections, or even in the case of a one-piece bent part 9, it is essential that the connecting sections 16, 17 or the connecting weld seams 18 run outside the bent areas 10 in order to avoid stress concentration in the bent areas 10.

In Figure 4 An embodiment variant of an undercarriage frame according to the invention is shown, the undercarriage frame comprising a first longitudinal beam 35 and a second longitudinal beam 36 in addition to the cross member designed as a bent part 9. The longitudinal members 35, 36 each have a central section 37 in the center, as seen in the width direction 6 (corresponds to the longitudinal direction of the chassis frame). The first longitudinal member 35 has a first longitudinal member connecting section in the central section 37 38 for connection to the cross member; the second side member 36 has a second side member connecting section 39 in the central section 37 for connection to the cross member.

To form the undercarriage frame, the first longitudinal member connection section 38 is now connected to the second connection section 8 of the cross member and the second longitudinal member connection section 38 is connected to the first connection section 7 of the cross member.

For this purpose, the longitudinal beam connecting sections 38, 39, analogous to the connecting edges 27, 28, 29 of the connecting sections 7, 8 of the cross member, have longitudinal beam connecting edges 40, so that the longitudinal beam connecting edges 40 are arranged on the circumference of a rectangle. In other words, the longitudinal beam connecting edges 40 comprise two pairs of mutually parallel edges which form a right angle with one another. In this case, two adjacent longitudinal beam connecting edges 40 do not touch one another and are entirely straight.

The longitudinal beam connection edges 40 of a longitudinal beam connection section 38, 39 are now connected to the connection edges 27, 28, 29 of the corresponding connection section 7, 8 of the cross member by means of connection weld seams 41 designed as butt seams. The fact that the connection weld seams 41 " are welded through ", there is a particularly highly resilient connection between the longitudinal beams 35, 36 and the cross member designed as a bent part 9.

Reference symbol list:

1

Top chord

2nd

Lower chord

3rd

first side wall

4th

second side wall

5

Length direction

6

Width direction

7

first connection section

8th

second connection section

9

Bent part

10th

Bending area

11

Bending radius

12th

first section of the bent part 9

13

second section of the bent part 9

14

first edge

15

second edge

16

first connection section

17th

second connection section

18th

Connection weld seam

19th

Division level

20

upper opening

21

lower opening

22

Side opening

23

first break

24th

second break

25th

third interruption

26

fourth interruption

27

upper connecting edge

28

lower connecting edge

29

side connection edge

30th

Recess

31

End section of the upper or lower connecting edge 27, 28

32

End section of the lateral connecting edge 29

33

rod-shaped section of the upper chord 1 or lower chord 2

34

rod-shaped section of the side walls 3,4

35

first side member

36

second side member

37

Central section of the side members 35, 36

38

first side member connection section

39

second side member connection section

40

Side member connecting edges

41

Connection welds

Claims (19)

1. Chassis frame of a rail vehicle having two longitudinal supports (35, 36) and a transverse support connecting both the longitudinal supports (35, 36), wherein the transverse support is embodied as box-shaped with an upper chord (1), a lower chord (2) and two lateral walls (3, 4) and when viewed in a longitudinal direction (5) has at the end in each case a connection section (7, 8) for connection to one of the longitudinal supports (35, 36), wherein the transverse support is a bending part (9), wherein a bending region (10) is embodied between the lateral walls (3, 4) and the upper chord (1) as well as between the lateral walls (3, 4) and the lower chord (2) in each case, and that each longitudinal support (35, 36) has in its central section (37) a longitudinal support connection section (38, 39) which is connected to one of the connection sections (7, 8) of the transverse support, characterised in that each longitudinal support connection section (38, 39) has four rectilinear, non-interconnected longitudinal support connection edges (40), which are preferably arranged on the circumference of a rectangle, and via connection weld seams (41) are connected to connection edges (27, 28, 29) of the transverse support.
2. Chassis frame according to claim 1, characterised in that the bending region (10) is embodied as a bending radius (11), wherein the centre point of the bending radius (11) is inside the transverse support.
3. Chassis frame according to claim 1 or 2, characterised in that the bending part (9) or sections (12, 13) of the bending part (9) each have two connecting sections (16, 17) for closing the bending part (9) at the first edges (14) parallel to the longitudinal direction (5).
4. Chassis frame according to one of claims 1 to 3, characterised in that the bending part (9) is embodied as a single piece.
5. Chassis frame according to claim 4, characterised in that the bending part (9) has a first connecting section (16) and a second connecting section (17) and that the first connecting section (16) is connected to the second connecting section (17) by a connecting weld seam (18), preferably a butt weld.
6. Chassis frame according to claim 4 or 5, characterised in that the connecting sections (16, 17) are embodied as part of the lower chord (2) and are preferably aligned symmetrically with respect to a width direction (6) which is perpendicular to the longitudinal direction (5).
7. Chassis frame according to one of claims 1 to 3, characterised in that the bending part (9) is embodied in several pieces and comprises at least a first section (12) and a second section (13), wherein at least one dividing plane (19) forming the sections (12, 13) is aligned parallel to the longitudinal direction (5).
8. Chassis frame according to claim 7, characterised in that the bending part (9) comprises exactly two sections (12, 13), wherein each section (12, 13) in each case comprises a lateral wall (3, 4) and a part, preferably half, of the upper chord (1) and the lower chord (2).
9. Chassis frame according to claim 7 or 8, characterised in that each section (12, 13) has a first connecting section (16) and a second connecting section (17) and in each case the first connecting section (16) of one of the sections (12, 13) is connected to the second connecting section (17) of the adjacent section (12, 13) by a connecting weld seam (18), preferably a butt weld.
10. Chassis frame according to claim 5 or 9, characterised in that the connecting weld seams (18) run outside the bending regions (10).
11. Chassis frame according to one of claims 1 to 10, characterised in that the transverse support, on its outer surface, comprising upper chord (1), lower chord (2) and the lateral walls (3, 4), has openings (20, 21, 22) on at least two opposing sides of the outer surface.
12. Chassis frame according to claim 11, characterised in that the upper chord (1) has at least one upper opening (20) and the lower chord (2) has at least one lower opening (21), wherein at least the upper opening (20) or the lower opening (21) occupies at least 50% of the surface area of the upper chord (1) or lower chord (2) respectively.
13. Chassis frame according to claim 11 or 12, characterised in that both lateral walls (3, 4) each have at least one lateral opening (22), wherein the lateral opening (22) of a lateral wall (3, 4) occupies at least 25% of the surface area of the respective lateral wall (3, 4).
14. Chassis frame according to one of claims 1 to 13, characterised in that the connection section (7, 8) provided for connection to one of the longitudinal supports (35, 36) in the development of the bending part (9) is formed by a second edge (15) of the bending part (9) running perpendicular to the longitudinal direction (5), said second edge (15) running rectilinearly and being subdivided by interruptions (23, 24, 25, 26).
15. Chassis frame according to claim 14, characterised in that an interruption (23, 24, 25, 26) is arranged in at least one bending region (10).
16. Chassis frame according to claim 14 or 15, characterised in that four interruptions (23, 24, 25, 26) are provided which subdivide the second edge (15) into an upper connection edge (27) of the upper chord (1), into a lower connection edge (28) of the lower chord (2) and two lateral connection edges (29) of the lateral walls (3, 4) .
17. Chassis frame according to one of claims 14 to 16, characterised in that at least one of the interruptions (23, 24, 25, 26) merges into a recess (30), wherein the dimensions of the recess (30) are larger than the dimensions of the interruptions (23, 24, 25, 26).
18. Chassis frame according to claim 17, characterised in that the maximum extent of the recess (30) in the width direction (6) comprises at least the bending region (10) and the maximum extent of the recess (30) in the longitudinal direction (5) is between 25% and 75%, preferably between 33% and 66%, in particular between 40% and 60%, of the maximum extent in the width direction (6) .
19. Chassis frame according to claim 17 or 18, characterised in that at least one end section (31, 32) of the adjacent connection edge (27, 28, 29) adjoining the interruption (23, 24, 25, 26) is formed by a rod-shaped section (33, 34) of the element (1, 2, 3, 4) forming the respective connection edge (27, 28, 29).

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