Pillow beam and underframe side beam connecting structure and vehicle body thereof

Abstract

The utility model discloses a kind of pillow beam and underframe side beam connecting structure and its car body, it includes pillow beam and underframe side beam, the pillow beam includes pillow beam upper plate and the pillow beam muscle plate arranged in the pillow beam upper plate below, the pillow beam upper plate of pillow beam upper end portion is stripped, make the pillow beam upper plate and pillow beam muscle plate of the pillow beam end portion form stepped structure, the inside of the underframe side beam is protruding and set pillow beam connecting unit, the pillow beam connecting unit is overlapped on the pillow beam muscle plate, the pillow beam upper plate is connected into an organic whole on the pillow beam muscle plate with the pillow beam connecting unit. The utility model changes the connecting position of traditional pillow beam upper plane and underframe side beam, offsets the welding area of pillow beam upper plane to inside, avoids lower door corner arc region, further avoids that door corner high stress area is located pillow beam weld heat affected zone, and the utility model whole structure is simple, good process, can effectively improve the safety of car body whole structure.

Description

Technical Field

[0001] This utility model relates to the aluminum alloy car body structure of rail vehicles, specifically to a connection structure between a sleeper beam and a base frame side beam, and its car body. Background Technology

[0002] Currently, the aluminum alloy bogie bolster structure of rail vehicles is generally welded from parallel extruded hollow aluminum profiles, with both ends of the bolster flush and welded to the underframe side beams on the outer side of the car body. The upper surface of the bolster and the upper surface of the underframe are generally at the same horizontal plane. As the supporting carrier of the bogie and transmitting the load of the coupler at the end traction beam, the bolster is an important force-transmitting component of the car body, and its weld to the underframe side beam is a critical force-transmitting weld of the car body.

[0003] Stress concentration is severe in the door opening area of ​​aluminum alloy vehicle bodies, resulting in localized weakness in the body. The stress is generally high at the corners of passenger compartment doors, especially the lower door corner arc. To address the issue of excessive stress at the lower door corners, a door corner structure is typically created through machining in the underframe side beam door opening area. This places the high-stress area in the base material rather than the weld, effectively improving the static stress state at the door corner.

[0004] Due to the limitations of the car body door openings and bogie positions, the distance between the upper plane of the bolster beam and the weld seam of the underframe side beam and the lower door corner is often too close. As a result, when assessing strength, the base material area at the door corner is evaluated as the heat-affected zone of the weld, which greatly reduces the allowable stress value at the door corner (taking 6mm thick EN AW 6005A T6 profile as an example, the allowable stress in the heat-affected zone is reduced by about 42% compared to the base material), affecting the safety of the car body structure. Utility Model Content

[0005] To address the problem in existing aluminum alloy vehicle bodies where the distance between the bolster beam and the lower door corner is too close, resulting in the high-stress area at the door corner being located within the heat-affected zone of the bolster beam weld, this utility model provides a bolster beam composite structure and its vehicle body. By optimizing the weld arrangement between the bolster beam and the underframe side beam, it effectively solves the above problems. Furthermore, the structure is simple, has good manufacturability, and can effectively improve the overall safety of the vehicle body structure.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A connection structure between a bolster beam and a base frame side beam includes a bolster beam and a base frame side beam. The bolster beam includes a bolster beam upper plate and a bolster beam stiffening plate arranged below the bolster beam upper plate. The upper plate of the bolster beam at the upper end is removed, so that the bolster beam upper plate and the bolster beam stiffening plate at the end of the bolster beam form a stepped structure. A bolster beam connecting unit is provided on the inner side of the base frame side beam. The bolster beam connecting unit overlaps the bolster beam stiffening plate. The bolster beam upper plate and the bolster beam connecting unit are connected to the bolster beam stiffening plate to form a whole.

[0008] In this way, the present invention changes the connection position between the upper plane of the bolster beam and the side beam of the underframe, shifting the welding area between the upper plane of the bolster beam and the side beam of the underframe inward, avoiding the lower door corner arc area, and thus preventing the high-stress area at the door corner from being located in the heat-affected zone of the bolster beam weld. At the same time, the present invention has a simple overall structure and good manufacturability, and can effectively improve the safety of the overall vehicle body structure.

[0009] Preferably, the bolster beam connecting unit is provided with a floor connection and a bolster beam connection, and the thickness of the floor connection is less than the thickness of the bolster beam connection.

[0010] Preferably, the base frame floor overlap platform is provided on the bolster beam connecting unit. The height of the base frame floor overlap platform is less than the height of the floor connection and the bolster beam connection, so that the base frame floor can be flush with the upper surface of the bolster beam and the upper platform surface of the base frame side beam.

[0011] Preferably, the ends of the bolster beam are machined with welding bevels.

[0012] Preferably, the upper surface of the upper plate of the pillow beam is flush with the upper platform surface of the side beam of the base frame.

[0013] Preferably, the pillow beam is welded from three parallel extruded hollow aluminum profiles.

[0014] Preferably, the width of the stepped structure and the width of the bolster beam connecting unit are not less than 30mm, so as to ensure that the weld between the bolster beam and the base frame side beam effectively avoids the lower corner arc.

[0015] Preferably, a process notch is provided on the upper plate and / or lower plate of the bolster beam at the end of the bolster beam, and the process notch is provided with a sealing cover plate.

[0016] Preferably, a welding pad is provided at the overlap of the bolster beam connecting unit on the bolster beam stiffener.

[0017] Based on the same inventive concept, this utility model also provides a vehicle body, which includes a chassis, wherein the chassis side beams and the bolster beams on the chassis adopt the bolster beam and chassis side beam connection structure.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention effectively solves the problem in existing aluminum alloy vehicle bodies where the high-stress area at the door corner is located in the heat-affected zone of the bolster beam weld due to the excessively close distance between the upper plane of the bolster beam and the weld seam of the underframe side beam and the lower door corner. Furthermore, this invention has a simple structure, good manufacturability, and can effectively improve the overall safety of the vehicle body structure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the connection structure between the pillow beam and the base frame side beam in an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the end structure of the pillow beam according to an embodiment of the present utility model;

[0023] Figure 3 This is a cross-sectional view of the connection area between the bolster beam and the base frame side beam in an embodiment of this utility model. Figure 1 Cross-sectional view at point A-A;

[0024] Figure 4 This is a cross-sectional view of the connection area between the base frame floor and the base frame side beam in an embodiment of this utility model. Figure 1 Cross-sectional view at point B-B;

[0025] Figure 5 This is a schematic diagram of the lower plane structure of the connection structure between the pillow beam and the base frame side beam in an embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram showing the connection between the lower plane of the end of the pillow beam and the side beam of the base frame in an embodiment of this utility model. Detailed Implementation

[0027] The present invention will be further described below with reference to specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0028] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Please see Figure 1 - Figure 6 An embodiment of the connection structure between the bolster beam and the base frame side beam of this utility model includes a bolster beam 1, a base frame side beam 2, and a base frame floor 3.

[0031] The bolster beam 1 is welded from three parallel extruded hollow aluminum profiles. The bolster beam 1 includes a parallel upper bolster plate 13 and a lower bolster plate 14, which are connected by bolster beam stiffeners 12. The upper bolster plates 13 at both ends of the bolster beam 1 are removed, so that the upper bolster plates 13 and the bolster beam stiffeners 12 at the ends of the bolster beam 1 form a stepped structure 11.

[0032] The inner side of the base frame side beam 2 is provided with a bolster beam connecting unit 22, which overlaps the bolster beam stiffening plate 12. A welding pad (not shown in the figure) is provided at the overlap of the bolster beam connecting unit on the bolster beam stiffening plate 12. The upper plate 13 of the bolster beam and the bolster beam connecting unit 22 are butt welded together on the bolster beam stiffening plate 12.

[0033] In this way, the present invention changes the position of the connection weld between the upper plate 13 of the bolster beam and the side beam 2 of the base frame, shifting the welding area of ​​the upper plane of the bolster beam to the inside of the base frame, avoiding the arc area of ​​the lower door corner 21, and thus avoiding the high stress area of ​​the door corner being located in the heat-affected zone of the bolster beam weld.

[0034] To ensure that the weld between the bolster beam 1 and the base frame side beam 2 effectively avoids the lower corner arc, the width of the stepped structure 11 (the horizontal dimension of the base frame) and the width of the bolster beam connecting unit 22 shall not be less than 30mm.

[0035] In this embodiment, the upper surface of the upper plate 13 of the bolster beam 1 is flush with the upper platform surface 23 of the side beam 2 of the base frame, and the floor 3 of the base frame is also flush with the upper surface of the upper plate 13 and the upper platform surface 23 of the side beam 2 of the base frame. Obviously, this utility model is not limited to this; for example, the upper surface of the upper plate 13 of the bolster beam may be higher or lower than the upper platform surface 23 of the side beam 2 of the base frame.

[0036] like Figure 4As shown, the bolster beam connecting unit 22 is provided with a floor connection 221 for welding the base frame floor 3 and a bolster beam connection 222 for welding the bolster beam 1. The thickness of the floor connection 221 is less than the thickness of the bolster beam connection 222. That is, the upper plate of the bolster beam connecting unit 22 is designed with a variable plate thickness. To ensure the connection strength of the bolster beam connection 222, the thickness of the bolster beam connection 222 is equal to the thickness of the upper plate 13 of the bolster beam, at least 8mm, while the thickness of the floor connection 221 can be set slightly thinner to reduce the weight of the base frame side beam 2.

[0037] To ensure complete weld penetration, the end of the bolster beam 1 is machined with a welding bevel 15. At the same time, a base frame floor overlap platform 223 is provided on the bolster beam connecting unit 22. The height of the base frame floor overlap platform 223 is less than the height of the floor connection 221 and the bolster beam connection 222, so that the base frame floor 3 can be flush with the upper plane of the bolster beam 1 and the upper platform surface 23 of the base frame side beam 2.

[0038] like Figure 5 , Figure 6 As shown, in order to weld the weld between the inner side of the bolster beam 12 and the base frame side beam 2, a process notch is usually made on the upper plate 13 and / or lower plate 14 of the bolster beam 1 at the end of the bolster beam 1, and a sealing cover plate 16 is installed to seal it. In order to ensure the continuity of the weld between the bolster beam 1 and the base frame side beam 2, the weld between the bolster beam bolster 12 and the bolster beam connecting unit 22 of the base frame side beam 2 needs to be welded. Therefore, the sealing cover plate 16 is set on the lower plate 14 of the bolster beam 1. When the bolster beam 1 is located in a non-corner area, the stepped structure 11 on the bolster beam 1 and the bolster beam connecting unit 22 on the base frame side beam 2 can be removed. The sealing cover plate 16 can still be set on the upper plate 13 of the bolster beam 1 to avoid welding deformation caused by the sealing cover plate 16 being set on the lower plate 14 of the bolster beam.

[0039] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solution of this utility model should fall within the protection scope of the technical solution of this utility model.

Claims

1. A connection structure between a bolster beam and a base frame side beam, comprising a bolster beam and a base frame side beam, wherein the bolster beam includes a bolster beam upper plate and a bolster beam stiffening plate arranged below the bolster beam upper plate, characterized in that: The upper plate of the bolster beam at the upper end is removed, so that the upper plate of the bolster beam at the end of the bolster beam and the bolster beam stiffening plate form a stepped structure. The inner side of the bottom frame side beam is provided with a bolster beam connecting unit, which overlaps on the bolster beam stiffening plate. The upper plate of the bolster beam and the bolster beam connecting unit are connected to the bolster beam stiffening plate as a whole.

2. The connection structure between the bolster beam and the base frame side beam according to claim 1, characterized in that, The bolster beam connection unit is provided with a floor connection and a bolster beam connection, and the thickness of the floor connection is less than the thickness of the bolster beam connection.

3. The connection structure between the bolster beam and the base frame side beam according to claim 1, characterized in that, The base frame floor overlap platform is provided on the bolster beam connection unit, and the height of the base frame floor overlap platform is less than the height of the floor connection and the bolster beam connection.

4. The connection structure between the bolster beam and the base frame side beam according to claim 1, characterized in that, The ends of the bolster beam are machined with welding bevels.

5. The connection structure between the bolster beam and the base frame side beam according to claim 1, characterized in that, The upper surface of the upper plate of the bolster beam is flush with the upper platform surface of the side beam of the base frame.

6. The connection structure between the bolster beam and the base frame side beam according to claim 1, characterized in that, The pillow beam is welded from three parallel extruded hollow aluminum profiles.

7. The connection structure between the bolster beam and the base frame side beam according to claim 1, characterized in that, The width of the stepped structure and the width of the pillow beam connecting unit are not less than 30mm.

8. The connection structure between the bolster beam and the base frame side beam according to claim 1, characterized in that, A process notch is provided on the upper plate and / or lower plate of the bolster beam at the end of the bolster beam, and the process notch is equipped with a sealing cover plate.

9. The connection structure between the bolster beam and the base frame side beam according to claim 1, characterized in that, A welding pad is provided at the overlap of the bolster beam connection unit on the bolster beam stiffener plate.

10. A vehicle body, including a chassis, characterized in that, The base frame side beams and bolster beams on the base frame adopt the connection structure of bolster beams and base frame side beams as described in any one of claims 1-9.

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