An underframe side beam of a rail vehicle body and its connection structure

Abstract

The present invention discloses a side beam of a car body underframe of a rail vehicle and its connection structure, which includes a straight side beam and an inclined side beam for connecting the driver's cab. The straight side beam and the inclined side beam are inserted into each other. The insertion depth between the straight side beam and the inclined side beam is 200 mm - 600 mm, and the insertion angle is 0° - 15°. The design of the present invention is reasonable. The connection structure of the straight side beam and the inclined side beam will form more connection welds that are consistent with the main stress direction of the car body. The high-strength connection structure is more conducive to the transmission of the longitudinal force of the car body, preventing the sudden change of the interface where the inclined side beam is connected to the straight side beam from easily generating gravitational concentration. At the sudden change of the interface, a connector is used to achieve a smooth transition of stress. By adjusting the insertion angle, it can be matched with a relatively slender driver's cab structure, and its car body structure has better aerodynamic performance and aesthetics, and is more suitable for urban rail vehicles with a higher speed grade, etc. It can also be matched with a relatively short driver's cab structure, and its car body structure is more suitable for subways and light rail trains with a lower speed grade.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and particularly to a side beam of a car body underframe of a rail vehicle and its connection structure. Background Art

[0002] The underframe is an important load-bearing component of the car body of a rail vehicle, which is crucial for the transmission of longitudinal and vertical forces and needs to have sufficient strength and stiffness. There are generally two forms of the car body structure of rail transit vehicles. One is with a driver's cab, and the other is without a driver's cab. The underframe structure of the car body with a driver's cab needs to be shaped according to the driver's cab structure at the driver's cab end. Therefore, the projection of the underframe structure of the car body with a driver's cab is trapezoidal at the driver's cab end and rectangular after the driver's cab end. So, the projection of the underframe structure of the car body with a driver's cab is a trapezoid + rectangle. The place where the trapezoid and the rectangle are connected is called an inflection point. Generally, the shorter side beam with a certain slope before the inflection point is called the inclined side beam, and the longer side beam after the inflection point is called the straight side beam. The connection and transition method between the straight and inclined side beams has always been a difficult point in the design of the underframe structure of rail transit car bodies, and its excellent structural design has an important impact on the longitudinal force transmission of the underframe structure.

[0003] Deficiencies of the prior art:

[0004] A spliced car body underframe side beam, a transition structure between a driver's cab skeleton and a vehicle, patent number CN 216034376 U. This patent discloses a car body underframe side beam, a transition structure between a driver's cab skeleton and a vehicle, and a vehicle. As Figure 8 shown, the inclined side beam of this patent needs to be bent by stretching. After stretching, the straight edge of the inclined side beam is spliced with the straight side beam. The cross-section of the underframe side beam is generally large and complex for the transmission and bearing of longitudinal forces, and its stretching processability is poor and the cost is high. The length of the driver's cab end of this structure is too long and is not suitable for the car body of urban rail transit vehicles;

[0005] A front-end structure of a rail train car body, patent number CN 113291330 A. This patent discloses a front-end structure of a rail vehicle car body, which is characterized by including a top connection beam, a side connection beam, a side column, an intermediate column, an underframe side beam, an inclined side beam, and an underframe end beam. As Figure 9 shown, the connection between the straight side beam and the inclined side beam of its underframe is a simple butt joint method, which is extremely simple and is not conducive to the transmission of longitudinal forces of the car body, with serious stress concentration and poor strength at the connection. Summary of the Invention

[0006] The purpose of the present invention is to provide a side beam of a car body underframe of a rail vehicle and its connection structure to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solution: A side beam of the underframe of a rail vehicle and its connection structure, including a straight side beam and an inclined side beam for connecting the driver's cab, the straight side beam and the inclined side beam are inserted into each other, the insertion depth between the straight side beam and the inclined side beam is 200mm - 600mm, and the insertion angle is 0° - 15°, there are at least three welding edges, namely upper, middle and lower, between the straight side beam and the inclined side beam, and a welding assembly is arranged between the straight side beam and the inclined side beam.

[0008] As a further improvement of the present invention, the welding assembly includes:

[0009] Several welding pads, the welding pads are arranged at the insertion part of the straight side beam and the inclined side beam, the welding seams of the welding pads with the straight side beam and the inclined side beam are in the same direction as the main stress direction of the car body, and the number of the welding pads is at least nine;

[0010] An end sealing plate, the end sealing plate is arranged at one end of the straight side beam and welded to the inclined side beam;

[0011] A lower sealing plate, the lower sealing plate is welded between the lower ends of the straight side beam and the inclined side beam.

[0012] As a further improvement of the present invention, the upper end of the straight side beam is inserted with a side wall assembly through a socket, and a hanging cross beam for underframe equipment is arranged at the lower end of the straight side beam.

[0013] As a further improvement of the present invention, the upper end of the inclined side beam is connected with a driver's cab assembly, and an aluminum bottom plate is arranged at the upper ends of the straight side beam and the inclined side beam.

[0014] As a further improvement of the present invention, a convex platform is arranged on one side of the inclined side beam for connecting with the lower frame of the driver's cab assembly, and a number of through holes for inserting bolts are arranged on the convex platform and the lower frame of the driver's cab assembly in one-to-one correspondence.

[0015] As a further improvement of the present invention, internal ribs for strengthening the bearing capacity of the straight side beam and the inclined side beam are arranged inside the straight side beam and the inclined side beam.

[0016] As a further improvement of the present invention, the through holes on the driver's cab assembly are oblong holes parallel to the inclined side beam along the vehicle length direction, and the through holes on the convex platform are short round holes.

[0017] As a further improvement of the present invention, the straight side beam and the hanging cross beam for underframe equipment are riveted through the setting of rivets.

[0018] As a further improvement of the present invention, grooves for installing welding pads are arranged on both the straight side beam and the inclined side beam.

[0019] As a further improvement of the present invention, the aluminum base plate and the straight side beam are lap-connected, and the width of the chassis structure formed by the aluminum base plate can be adjusted by adjusting the lap amount.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. In the present invention, the straight side beam and the inclined side beam are inserted into each other. The insertion depth of the straight side beam and the inclined side beam is 200 mm - 600 mm, and the insertion angle is 0° - 15°. There are at least three welding edges, namely upper, middle and lower, between the straight side beam and the inclined side beam. By adjusting the insertion angle, it can be matched with a relatively slender cab structure, and the vehicle body structure has better aerodynamic performance and aesthetics, and is more suitable for urban rail vehicles with a higher speed grade, etc. It can also be matched with a relatively short cab structure, and its vehicle body structure is more suitable for subways and light rail trains with a lower speed grade;

[0022] 2. In the present invention, a welding assembly is provided. The welding assembly includes a plurality of welding pads, end plates and lower plates. The connection structure between the straight side beam and the inclined side beam will form more connection welds that are consistent with the main stress direction of the vehicle body. The high strength of the connection structure is more conducive to the transmission of the longitudinal force of the vehicle body, preventing the concentration of gravitational force from easily occurring at the interface mutation where the inclined side beam and the straight side beam are connected. A connecting piece is used at the interface mutation to achieve a smooth transition of stress;

[0023] 3. In the present invention, a chassis equipment hanging cross beam is provided at the lower end of the straight side beam. The straight side beam and the chassis equipment hanging cross beam are riveted by setting rivets. The riveting process is mature, the connection is reliable, and it does not require regular inspection as frequently as bolts;

[0024] 4. In the present invention, a convex platform for connecting with the lower frame of the cab assembly is provided on one side of the inclined side beam. A plurality of through holes for inserting bolts are provided on the convex platform and the lower frame of the cab assembly in one-to-one correspondence. The through holes on the cab assembly are oblong holes parallel to the inclined side beam along the vehicle length direction, and the through holes on the convex platform are short round holes. The cooperation of the oblong hole and the round hole realizes both the stability of the connection structure and the size adjustment. The assembly process is simple. All the connection bolts of this structure are visible under the vehicle, which is convenient for maintenance. When the cab structure is damaged separately and cannot be repaired, the entire cab structure can be replaced by removing the bolts, which can avoid the possibility of vehicle body scrapping or save a large amount of maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall assembly of the present invention;

[0026] Figure 2 It is an exploded view of the connection between the straight side beam and the inclined side beam of the present invention;

[0027] Figure 3Schematic diagram of the connection weld between the straight-edge beam and the bevel-edge beam of the present invention;

[0028] Figure 4 Schematic diagram of the straight-edge beam of the present invention;

[0029] Figure 5 Schematic diagram of the bevel-edge beam of the present invention;

[0030] Figure 6 Schematic diagram of the connection between the straight-edge beam and the bevel-edge beam of the present invention;

[0031] Figure 7 Cross-sectional view of the installation of the side wall assembly, the hanging cross beam of the underframe equipment, and the aluminum bottom plate of the present invention.

[0032] Figure 8 Schematic diagram of the transition structure between the side beam of the vehicle underframe and the cab skeleton involved in Patent CN 216034376 U;

[0033] Figure 9 Schematic diagram of the front-end structure of the vehicle body of the rail vehicle involved in Patent Application CN113291330A;

[0034] In the figure: 1, straight-edge beam; 101, internal rib; 102, groove body; 2, bevel-edge beam; 21, boss; 3, welding assembly; 31, welding backing plate; 32, end sealing plate; 33, lower sealing plate; 4, side wall assembly; 5, hanging cross beam of the underframe equipment; 6, cab assembly; 7, aluminum bottom plate; 8, rivet. Detailed implementation manners

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] It should be noted that when an element is referred to as being "fixed", "installed", "connected" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0037] As a further improvement of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0038] Example 1

[0039] See also Figures 1-5 The present invention provides a technical solution: a rail vehicle body underframe side beam and its connection structure, comprising a straight side beam 1 and a beveled side beam 2 for connecting a driver's cab, the straight side beam 1 and the beveled side beam 2 are plugged together, the plugging depth of the straight side beam 1 and the beveled side beam 2 is 200mm-600mm, and the plugging angle is 0°-15°, and the straight side beam 1 and the beveled side beam 2 include three welding edges A, B, and C (such as Figure 3 As shown), a welding assembly 3 is arranged between the straight side beam 1 and the beveled side beam 2, the insertion depth of the straight side beam 1 and the beveled side beam 2 is 300mm, and the length between the two is 3°. The connection structure of the straight side beam 1 and the beveled side beam 2 will form more connection welds that are consistent with the main stress direction of the vehicle body. The high strength of the connection structure is more conducive to the transmission of the longitudinal force of the vehicle body, and prevents the interface mutation between the beveled side beam 2 and the straight side beam 1 from easily causing gravitational concentration. A connector is used to achieve a smooth transition of stress at the interface mutation. With a relatively slender driver's cab, its body structure has better aerodynamic performance and aesthetics, and is more suitable for urban vehicles with higher speed levels.

[0040] In some embodiments of the present invention, the welding assembly 3 includes a plurality of welding pads 31, end sealing plates 32 and lower sealing plates 33. The welding pads 31 are arranged at the plug-in portion of the straight side beam 1 and the bevel side beam 2. The welding seams between the welding pads 31 and the straight side beam 1 and the bevel side beam 2 are in the same direction as the main stress of the vehicle body. There are at least nine welding pads 31. The end sealing plate 32 is arranged at one end of the straight side beam 1 and welded to the bevel side beam 2. The lower sealing plate 33 is welded between the lower ends of the straight side beam 1 and the bevel side beam 2, and has excellent connection strength. The design of the welding operation space allows the welding operation to be carried out at the place where the inner side cannot be welded, so that this connection structure has a higher connection strength.

[0041] Both the straight side beam 1 and the oblique side beam 2 are provided with a groove body 102 for mounting the welding pad 31 , so that there is enough operating space during the welding process.

[0042] In some embodiments of the present invention, the upper end of the straight side beam 1 is plugged with the side wall assembly 4 by setting a plug interface, and the straight side beam 1 and the side wall assembly 4 are connected through the plug interface. After the straight side beam 1 and the side wall assembly 4 are aligned and plugged firmly, the assembly is completed by welding at both sides of the joint. This joint has a welding pad 31, and the lower end of the straight side beam 1 is provided with a chassis equipment hanging beam 5;

[0043] The straight side beam 1 and the hanging cross beam 5 of the underframe equipment are riveted by arranging rivets 8.

[0044] In some embodiments of the present invention, the upper end of the inclined side beam 2 is connected with a cab assembly 6, and an aluminum bottom plate 7 is arranged at the upper ends of the straight side beam 1 and the inclined side beam 2;

[0045] The aluminum bottom plate 7 is connected with the straight side beam 1 by lapping connection, and the width of the underframe structure formed by the aluminum bottom plate 7 can be adjusted by adjusting the lapping amount.

[0046] In some embodiments of the present invention, a boss 21 for connecting with the lower end frame of the cab assembly 6 is arranged on one side of the inclined side beam 2. A plurality of through holes for inserting bolts are arranged on the boss 21 and the lower end frame of the cab assembly 6 in one-to-one correspondence. The tolerance adjustment during the installation of the cab structure is realized through the cooperation of the oblong hole and the round hole. In addition, there needs to be enough operation and maintenance space around the bolt;

[0047] The through hole on the cab assembly 6 is an oblong hole parallel to the inclined side beam 2 along the vehicle length direction, and the through hole on the boss 21 is a short round hole.

[0048] In some embodiments of the present invention, internal ribs 101 for strengthening the bearing capacity of the straight side beam 1 and the inclined side beam 2 are arranged inside the straight side beam 1 and the inclined side beam 2 to provide sufficient strength for the welding of the inclined side beam 2 and the bearing of the underframe equipment.

[0049] Embodiment 2

[0050] Please refer to Figures 1-5 , the present invention provides a technical solution: a side beam of the underframe of a rail vehicle body and its connection structure, including a straight side beam 1 and an inclined side beam 2 for connecting the cab. The straight side beam 1 and the inclined side beam 2 are inserted into each other. The insertion depth of the straight side beam 1 and the inclined side beam 2 is 200 mm - 600 mm, and the insertion angle is 0° - 15°. There are three welding edges A, B, and C between the straight side beam 1 and the inclined side beam 2 (as Figure 3 shown), a welding assembly 3 is arranged between the straight side beam 1 and the inclined side beam 2. The insertion depth of the straight side beam 1 and the inclined side beam 2 is 600 mm, and the length between the two is 15°. The connection structure of the straight side beam 1 and the inclined side beam 2 will form more connection welds consistent with the main stress direction of the vehicle body. The connection structure has high strength and is more conducive to the transmission of the longitudinal force of the vehicle body, preventing the stress concentration that is likely to occur at the interface mutation where the inclined side beam 2 is connected to the straight side beam 1. A connecting piece is used to realize the smooth transition of stress at the interface mutation. With a relatively slender cab, its vehicle body structure has better aerodynamic performance and aesthetics, and is more suitable for urban rail vehicles with a higher speed grade, etc.

[0051] In some embodiments of the present invention, the welding assembly 3 includes a plurality of welding pads 31, end sealing plates 32 and lower sealing plates 33. The welding pads 31 are arranged at the plug-in portion of the straight side beam 1 and the bevel side beam 2. The welding seams between the welding pads 31 and the straight side beam 1 and the bevel side beam 2 are in the same direction as the main stress of the vehicle body. There are at least nine welding pads 31. The end sealing plate 32 is arranged at one end of the straight side beam 1 and welded to the bevel side beam 2. The lower sealing plate 33 is welded between the lower ends of the straight side beam 1 and the bevel side beam 2, and has excellent connection strength. The design of the welding operation space allows the welding operation to be carried out at the place where the inner side cannot be welded, so that this connection structure has a higher connection strength.

[0052] Both the straight side beam 1 and the oblique side beam 2 are provided with a groove body 102 for mounting the welding pad 31 , so that there is enough operating space during the welding process.

[0053] In some embodiments of the present invention, the upper end of the straight side beam 1 is plugged with the side wall assembly 4 by setting a plug interface, and the straight side beam 1 and the side wall assembly 4 are connected through the plug interface. After the straight side beam 1 and the side wall assembly 4 are aligned and plugged firmly, the assembly is completed by welding at both sides of the joint. This joint has a welding pad 31, and the lower end of the straight side beam 1 is provided with a chassis equipment hanging beam 5;

[0054] The straight side beam 1 and the underframe equipment hanging cross beam 5 are riveted together by arranging rivets 8 .

[0055] In some embodiments of the present invention, the upper end of the hypotenuse beam 2 is connected to a driver's cab assembly 6, and the upper ends of the straight side beam 1 and the hypotenuse beam 2 are provided with an aluminum bottom plate 7;

[0056] The aluminum bottom plate 7 and the straight side beam 1 are overlapped and connected, and the width of the underframe structure formed by the aluminum bottom plate 7 can be adjusted by adjusting the overlap amount.

[0057] In some embodiments of the present invention, a boss 21 for connecting to the lower end frame of the cab assembly 6 is provided on one side of the bevel beam 2, and a plurality of through holes for inserting bolts are provided on the boss 21 and the lower end frame of the cab assembly 6, and the tolerance adjustment during the installation of the cab structure is achieved by the cooperation between the oblong hole and the round hole. In addition, there needs to be sufficient space for operation and maintenance around the bolts;

[0058] The through hole on the cab assembly 6 is an oblong hole parallel to the hypotenuse beam 2 along the vehicle length direction, and the through hole on the boss 21 is a short circular hole.

[0059] In some embodiments of the present invention, the straight side beam 1 and the oblique side beam 2 are both provided with internal ribs 101 for strengthening the bearing capacity of the straight side beam 1 and the oblique side beam 2 to provide sufficient strength for welding with the oblique side beam 2 and bearing the chassis equipment.

[0060] In this device, the connection structure between the straight-edge beam 1 and the bevel-edge beam 2 will form more connection welds that are consistent with the main stress direction of the car body. The high strength of the connection structure is more conducive to the transmission of the longitudinal force of the car body, preventing the stress concentration that is likely to occur at the interface where the bevel-edge beam 2 is connected to the straight-edge beam 1. At the interface mutation, connectors are used to achieve a smooth transition of stress. By adjusting the insertion angle, it can be matched with a relatively slender cab structure, and its car body structure has better aerodynamic performance and aesthetics, and is more suitable for urban rail vehicles with a higher speed grade, etc. It can also be matched with a relatively short cab structure, and its car body structure is more suitable for subways and light rail trains with a lower speed grade.

[0061] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusively, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0062] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An underframe side beam of a rail vehicle body and its connection structure, comprising a straight side beam (1) and an inclined side beam (2) for connecting the driver's cab, characterized in that: The straight-edge beam (1) and the bevel-edge beam (2) are inserted into each other. The insertion depth between the straight-edge beam (1) and the bevel-edge beam (2) is 200 mm - 600 mm, and the insertion angle is 0° - 15°. There are at least three welding edges, namely upper, middle, and lower, between the straight-edge beam (1) and the bevel-edge beam (2). A welding assembly (3) is arranged between the straight-edge beam (1) and the bevel-edge beam (2). The welding assembly (3) includes: A number of welding pads (31). The welding pads (31) are arranged at the insertion part of the straight-edge beam (1) and the bevel-edge beam (2). The welding seams between the welding pads (31), the straight-edge beam (1), and the bevel-edge beam (2) are in the same direction as the main stress direction of the car body. The number of the welding pads (31) is at least nine. An end sealing plate (32). The end sealing plate (32) is arranged at one end of the straight-edge beam (1) and welded to the bevel-edge beam (2). A lower sealing plate (33). The lower sealing plate (33) is welded between the lower ends of the straight-edge beam (1) and the bevel-edge beam (2).

2. The side sill of the car body underframe of the rail vehicle and its connection structure according to claim 1, characterized in that: The upper end of the straight-edge beam (1) is inserted with a side wall assembly (4) through an insertion opening. A underframe equipment hanging cross beam (5) is arranged at the lower end of the straight-edge beam (1).

3. The side sill of the car body underframe of a rail vehicle and its connection structure according to claim 1, characterized in that: The upper end of the bevel-edge beam (2) is connected with a driver's cab assembly (6). An aluminum bottom plate (7) is arranged at the upper ends of the straight-edge beam (1) and the bevel-edge beam (2).

4. The side sill of the car body underframe of a rail vehicle and its connection structure according to claim 3, characterized in that: A boss (21) for connecting with the lower frame of the driver's cab assembly (6) is arranged on one side of the bevel-edge beam (2). A number of through holes for inserting bolts, which correspond to each other one by one, are arranged on the boss (21) and the lower frame of the driver's cab assembly (6).

5. The side sill of the car body underframe of the rail vehicle and its connection structure according to claim 1, characterized in that: Internal ribs (101) for strengthening the bearing capacity of the straight-edge beam (1) and the bevel-edge beam (2) are arranged inside the straight-edge beam (1) and the bevel-edge beam (2).

6. The side sill of the car body underframe of the rail vehicle and its connection structure according to claim 4, characterized in that: The through holes on the driver's cab assembly (6) are oblong holes parallel to the bevel-edge beam (2) along the vehicle length direction, and the through holes on the boss (21) are short round holes.

7. The side sill of the car body underframe of the rail vehicle and its connection structure according to claim 2, characterized in that: The straight-edge beam (1) and the underframe equipment hanging cross beam (5) are riveted through rivets (8).

8. The side sill of the car body underframe of the rail vehicle and its connection structure according to claim 1, characterized in that: Grooves (102) for installing the welding pads (31) are arranged on both the straight-edge beam (1) and the bevel-edge beam (2).

9. The side sill of the car body underframe of a rail vehicle and its connection structure according to claim 3, characterized in that: The aluminum bottom plate (7) and the straight-edge beam (1) are connected by lap joint. The width of the underframe structure formed by the aluminum bottom plate (7) can be adjusted by adjusting the lap amount.

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