Underframe connection structure suitable for articulated bogie of straddle-type monorail vehicle

Abstract

An underframe connection structure (A) suitable for an articulated bogie of a straddle-type monorail vehicle, the underframe connection structure (A) having a frame structure for connecting an articulated bogie (C) to an underframe (B) and transmitting a longitudinal traction force. The frame structure comprises a small longitudinal beam component (1), a large longitudinal beam component (2), a transverse beam component (3) and an articulated mounting beam (4), wherein the transverse beam component (3) is connected to the rear ends of a small longitudinal beam (11) and a large longitudinal beam (21) in a spanning manner, the articulated mounting beam (4) is connected to the front ends of a trapezoidal frame (16) and the large longitudinal beam (21) in a spanning manner, the articulated mounting beam (4) is fixedly connected to the articulated bogie (C), and the bending moment of the articulated bogie (C) smoothly transitions to the floor of the underframe (B) by means of both the small longitudinal beam component (1) and the large longitudinal beam component (2). Rationally utilizing the advantages of castings and carbon steel parts enables a more compact overall structure, a stronger bearing capacity, a better lightweight performance, the ease of modular production, little welding deformation, and the ease of controlling the structure size; the vehicle-end space is fully utilized, such that a built-in wheel compartment is smaller and closer to a gangway connection, and the effective utilization area in a passenger compartment is increased; moreover, the fixed connection between articulation points of the articulated bogie and a vehicle body is realized.

Description

A base frame connection structure suitable for articulated bogies of straddle-type monorail vehicles Technical Field

[0001] This invention relates to the field of articulated straddle-type monorail technology, and more particularly to a base frame connection structure suitable for articulated bogies. Background Technology

[0002] Straddle-type monorail transit is a typical urban rail transit system that can effectively adapt to different terrains, small curve radii, and other special conditions. It also requires less land, generates less noise, has a shorter construction period, lower costs, smaller track beams, and less impact on the landscape, making it more economical and adaptable than subways. These unique advantages determine that this type of urban rail transit system has broad potential for further promotion and application.

[0003] Currently, the rail vehicle underframe is the component that bears the greatest stress in the entire car body, playing the role of supporting the entire car. The bogie underframe connection structure is the most important component of the entire underframe, serving as the hub for force transmission between the car body and the bogie. Therefore, the design of the bogie underframe connection structure is particularly important.

[0004] The straddle-type monorail underframe differs from the subway underframe. It is a low-floor structure, and the tires of the straddle-type monorail underframe extend deep into the vehicle. Therefore, the underframe structure needs to have openings to avoid the tire area, which places higher demands on the optimization of the force flow path of the underframe. In traditional subway underframes, the longitudinal force is directly transmitted to the vehicle through the longitudinal beams and released through flexural deformation. With the openings, the stress of the straddle-type monorail underframe is more likely to concentrate in the opening area, which is not conducive to the transmission and release of force.

[0005] Traditional straddle-type monorails often use single-axle bogies, with an articulation device added at the end of the car body between two adjacent cars. Through the car body articulation, the entire bogie tire area is extended into the car body interior space, reducing the utilization rate of the car body interior space. In order to reduce the weight of rail vehicles, the underframe is often made of aluminum alloy material. However, aluminum alloy material has low strength, stiffness and load-bearing capacity, and its performance is not ideal when used in areas with high local stress in the whole vehicle. Technical issues

[0006] To address the problems in related technologies, this invention proposes a chassis connection structure suitable for articulated bogies of straddle-type monorail vehicles, which can comprehensively solve the above problems. The overall structure of this invention is simpler, has a stronger load-bearing capacity, is easy to modularly produce, and makes full use of the end space, resulting in a smaller wheel well and closer proximity to the passageway, increasing the effective usable area inside the passenger compartment; furthermore, it achieves a fixed connection between the articulated bogie hinge point and the car body. Technical solutions

[0007] Therefore, the specific technical solution adopted by the present invention is as follows: a base frame connection structure suitable for articulated bogies of straddle-type monorail vehicles, characterized in that it has a frame structure for connecting the articulated bogie and the base frame and transmitting longitudinal traction force, the frame structure comprising small longitudinal beams, large longitudinal beams, cross beams and articulated mounting beams.

[0008] The small longitudinal beam assembly includes a small longitudinal beam and a trapezoidal frame located at the front end of the small longitudinal beam. The small longitudinal beam is fixed to the base frame floor and is used to transmit longitudinal traction force to the base frame.

[0009] The main longitudinal beam consists of a main longitudinal beam, a transition floor located on the outside of the main longitudinal beam, and a longitudinal connecting side plate located on the side of the transition floor. The transition floor is used to install the flooring, and the longitudinal connecting side plate is fixed to the base frame floor.

[0010] The crossbeams are connected across the rear ends of the small longitudinal beams and the large longitudinal beams. The hinged mounting beams are connected across the front ends of the trapezoidal frame and the large longitudinal beams. The hinged mounting beams are fixedly connected to the hinged bogies. The bending moment of the hinged bogies is smoothly transferred to the base frame floor through the small longitudinal beams and the large longitudinal beams.

[0011] Furthermore, the small longitudinal beams are riveted and fixed to the base frame floor, the longitudinal connecting side plates are riveted and fixed to the base frame floor, the crossbeams are riveted and fixed to the small and large longitudinal beams, and the hinged mounting beams are riveted and fixed to the trapezoidal frame and the large longitudinal beams.

[0012] Furthermore, the small longitudinal beam assembly also includes a first L-shaped column located behind the trapezoidal frame, and the large longitudinal beam assembly also includes a second L-shaped column located in front of the large longitudinal beam. The upper ends of the first L-shaped column and the upper ends of the second L-shaped column are connected by a connecting beam, which is provided with a wheel well mounting interface. The front facade of the connecting beam is riveted and fixed to the vehicle end wall panel.

[0013] This invention provides a base frame connection structure for an articulated bogie, filling the gap in traditional articulated straddle-type monorail systems where adjacent trains can only be articulated at the car body end. It solves the problem that in existing technologies, the bogie tire area extends deep into the car body interior space, reducing the utilization rate of the car body interior space. It also solves the problems of complex force transmission design, complex manufacturing process, difficulty in controlling dimensional tolerances, and large welding deformation in existing technologies, achieving lightweight design while ensuring that the structural strength and stiffness meet the requirements.

[0014] The present invention makes reasonable use of the advantages of castings and carbon steel parts, making the overall structure simpler, stronger in load-bearing capacity, and lighter in weight. It is easy to achieve modular production, with small welding deformation and easy control of structural dimensions. It also makes full use of the space at the end of the car, making the interior wheel well smaller and closer to the through passage, increasing the effective utilization area of ​​the passenger compartment. Furthermore, it achieves a fixed connection between the articulated bogie hinge point and the car body. Beneficial effects

[0015] In summary, the significant advantages of the structure of this invention are as follows:

[0016] 1. This structure occupies little passenger cabin space, has a small wheel well, and achieves high passenger cabin space utilization;

[0017] 2. Stronger load-bearing capacity and lightweight design;

[0018] 3. The modules are connected by riveting and bolting, which allows for a certain degree of adjustment and facilitates control of the overall structural dimensions;

[0019] 4. It is easy to modularize, the production and processing technology is convenient, the on-site operation is simple, and the welding deformation is small;

[0020] 5. Easy to achieve obstacle avoidance in the bogie and tire areas;

[0021] 6. Simple structure and high space utilization, enabling low-floor structural design;

[0022] 7. Improved the structural strength and rigidity of the vehicle chassis. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of the underframe connection structure of the articulated bogie of straddle-type monorail vehicles according to the present invention.

[0025] Figure 2 is a schematic diagram of the installation of the underframe connection structure of the articulated bogie of straddle-type monorail vehicles according to the present invention.

[0026] Figure 3 is a schematic diagram of the structure composed of small longitudinal beams.

[0027] Figure 4 is a schematic diagram of the structure composed of small longitudinal beams.

[0028] Figure 5 is a schematic diagram of the main longitudinal beam structure.

[0029] Figure 6 is a schematic diagram of the main longitudinal beam structure.

[0030] Figure 7 is a schematic diagram of the beam structure.

[0031] Figure 8 is a schematic diagram of a hinged beam structure.

[0032] Figure 9 is a schematic diagram of the hinged beam structure.

[0033] The icon numbers are illustrated below:

[0034] A - Underframe connection structure, B - Underframe, C - Bogie;

[0035] 1-Composed of small longitudinal beams, 11-Small longitudinal beams, 12-First small end plate, 13-First L-shaped column, 14-First connecting beam fixing plate, 15-First transverse connecting base plate, 16-Trapezoidal frame; 17-First end plate, 18-First end wall connecting plate;

[0036] 2-Composition of main longitudinal beams, 21-Main longitudinal beams, 22-Transition floor, 23-Longitudinal connecting side plates, 24-Second transverse connecting bottom plates, 25-Second L-shaped columns, 26-Second connecting beam fixing plates, 27-Second end plates, 28-Second end wall connecting plates, 29-Second small end plates;

[0037] 3-Composed of crossbeams, 31-Crossbeams, 32-Wheel bay connecting plate, 33-Composed of reinforcing components;

[0038] 4-Hinged mounting beam, 41-Hinged seat mounting interface, 411-M20 threaded hole, 412-Hinged seat shaft hole, 413-φ10 positioning hole, 42-Vehicle end shock absorber interface, 421-φ17 mounting hole, 422-First triangular reinforcing rib, 43-Riveting mounting interface, 431-Riveting hole, 432-Vertical rib, 44-Upper wing surface, 45-Transition beam, 414-Trapezoidal cavity, 423-Second triangular reinforcing rib, 433-Riveting surface;

[0039] 5-Connecting beam. The best embodiment of the present invention

[0040] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0041] As shown in Figures 1 and 2, this embodiment of the invention is applicable to the underframe connection structure A of the articulated bogie of a straddle-type monorail vehicle. It has a rectangular frame structure for connecting the articulated bogie C and the underframe B and transmitting longitudinal traction force. The rectangular frame structure includes a small longitudinal beam assembly 1, a large longitudinal beam assembly 2, a crossbeam assembly 3, an articulated mounting beam 4, and a connecting beam 5. The small longitudinal beam assembly 1, the large longitudinal beam assembly 2, and the crossbeam assembly 3 are all welded from carbon steel components. Each module is welded separately and simultaneously. After welding, the small longitudinal beam assembly 1, the large longitudinal beam assembly 2, and the crossbeam assembly 3 are connected to the articulated mounting beam 4 and the connecting beam 5 by rivets and bolts. The articulated mounting beam 4 is a casting.

[0042] As shown in Figures 3 and 4, the small longitudinal beam assembly 1 includes a small longitudinal beam 11 and a trapezoidal frame 16 located at the front end of the small longitudinal beam 11. The small longitudinal beam 11 is riveted and fixed to the base frame floor. The small longitudinal beam assembly 1 also includes a first transverse connecting base plate 15 located behind the small longitudinal beam 11 and extending rearward. The first transverse connecting base plate 15 is riveted and fixed to the base frame floor. It can be seen that there are two riveting structures between the small longitudinal beam 11 and the floor, distributed on the outer side of the small longitudinal beam 11 and the first transverse connecting base plate 15 behind the small longitudinal beam 11, through which longitudinal traction force is transmitted. The trapezoidal frame 16 is used to fix the hinged mounting beam 4. Specifically, the front end of the trapezoidal frame 16 is provided with a first end plate 17, which is hinged to the right end of the hinged mounting beam 4.

[0043] In this example, the small longitudinal beam component 1 also includes a first L-shaped column 13 located behind the trapezoidal frame 16. This first L-shaped column 13 is used to fix the upper crossbeam 5. Specifically, a first connecting beam fixing plate 14 is fixed to the upper end of the first L-shaped column 13, and the first connecting beam fixing plate 14 is fixedly connected to the right end of the crossbeam 5 by bolts. A first small end plate 12 is provided at the rear end of the small longitudinal beam 11, and the first small end plate 12 is used to connect the crossbeam 3. A first end wall connecting plate 18 is provided on the front side of the first L-shaped column 13, and the first end wall connecting plate 18 is used to connect the end wall, specifically by riveting.

[0044] When welding the small longitudinal beams, first connect the small longitudinal beam 11 to the first small end plate 12 and the first transverse connecting base plate 15, then connect the first L-shaped column 13, the first connecting beam fixing plate 14 and the first end wall connecting plate 18, and finally connect the trapezoidal frame 16 and the first end plate 17. After welding, the riveting surfaces are machined. The small longitudinal beam 11 and the first transverse connecting base plate 15 provide the riveting connection interface between the small longitudinal beam assembly 1 and the underframe floor, and transfer the longitudinal force on the small longitudinal beam assembly to the underframe. The first small end plate 12 provides the riveting connection interface between the small longitudinal beam assembly 1 and the crossbeam assembly 3. The first connecting beam fixing plate 14 provides the bolt connection interface between the small longitudinal beam assembly 1 and the connecting beam 5. The first end plate 17 provides the riveting connection interface between the small longitudinal beam assembly 1 and the hinged mounting beam 4. The first L-shaped column 13 provides the internal wheel well mounting interface. The first end wall connecting plate 18 provides the riveting connection surface for the car body end wall. The trapezoidal frame 16 smoothly transfers the bending moment force of the hinged bogie to the underframe floor.

[0045] As shown in Figures 5 and 6, the main longitudinal beam assembly 2 includes a main longitudinal beam 21, a transition floor 22 located outside the main longitudinal beam 21, and a longitudinal connecting side plate 23 located on the side of the transition floor 22. The transition floor 22 is used to install the flooring fabric, and the longitudinal connecting side plate 23 is riveted and fixed to the underframe floor. As shown in Figure 5, the main longitudinal beam assembly 2 also includes a second transverse connecting bottom plate 24 located behind the transition floor 22 and extending rearward. The second transverse connecting bottom plate 24 is riveted and fixed to the underframe floor. It can be seen that the main longitudinal beam assembly 2 is riveted to the underframe floor through the longitudinal connecting side plate 23 and the second transverse connecting bottom plate 24, respectively, and longitudinal traction force is transmitted through these two points. A second end plate 27 is provided at the front end of the main longitudinal beam 21, which is riveted and fixed to the left end of the hinged mounting beam 4. The hinged mounting beam 4 is fixedly connected to the hinged bogie, and the bending moment force of the hinged bogie is smoothly transferred to the underframe floor through the small longitudinal beam assembly 1 and the main longitudinal beam assembly 2.

[0046] As shown in Figures 5 and 6, the main longitudinal beam assembly 2 also includes a second L-shaped column 25 located at the front of the main longitudinal beam 21. This second L-shaped column 25 is used to fix the crossbeam 5. Specifically, a second connecting beam fixing plate 26 is fixed to the upper end of the second L-shaped column 25, and the second connecting beam fixing plate 26 is fixedly connected to the left end of the crossbeam 5 by bolts. A second end wall connecting plate 28 is provided on the front side of the second L-shaped column 15 and the transition floor 22. The second end wall connecting plate 28 is used to rivet and fix to the vehicle end wall beam. A second small end plate 29 is provided at the rear end of the main longitudinal beam 21, and the second small end plate 29 is used to connect the crossbeam 3. A second end plate 27 is provided at the front end of the main longitudinal beam 21, and the second end plate 27 is used to connect the hinged mounting beam 4. Specifically, the second end plate 27 is hinged and fixed to the left end of the hinged mounting beam 4.

[0047] When welding the main longitudinal beam, first connect the main longitudinal beam 21 to the second end plate 27 and the second end wall connecting plate 28, then connect the transition floor structure 22, the second L-shaped column 25, and the second connecting beam fixing plate 26, and finally connect the longitudinal connecting side plate 23, the second transverse connecting bottom plate 24, and the second small end plate 29. After the welding is completed, the riveted surfaces are machined. The main longitudinal beam 21 is designed as a Y-shaped beam to ensure a smooth transition of the bending moment transmitted by the bogie hinge seat to the underframe, and provides an installation interface for the inner wheel well and a riveting connection interface for the main longitudinal beam assembly 2 and the crossbeam assembly 3; the transition floor 22 connects the main longitudinal beam structure 21, the longitudinal connecting side plate 23, the second transverse connecting bottom plate 24, and the second end wall connecting plate 28 into one unit, and the upper surface provides an installation surface for the inner floor fabric. Parallel stiffeners are rationally designed inside the cavity according to the force flow transmission path to improve load-bearing capacity, and the rest are removed to reduce weight; the longitudinal connecting side plate 23 and the second transverse connecting bottom plate 24 provide riveting interfaces for the main longitudinal beam assembly 2 and the underframe floor; the second L-shaped column 25 provides an installation interface for the inner wheel well; the second connecting beam fixing plate 26 provides a bolt connection interface for the connection between the main longitudinal beam assembly 2 and the connecting beam 5; the second small end plate 29 provides a riveting interface for the connection between the main longitudinal beam assembly 2 and the crossbeam assembly 3; the second end plate 27 provides a riveting interface for the connection between the main longitudinal beam assembly 2 and the hinged mounting beam 4.

[0048] As shown in Figure 1, a connecting beam 5 is transversely connected to the upper end of the first L-shaped column 13 of the small longitudinal beam component 1 and the upper end of the second L-shaped column 25 of the large longitudinal beam component 2. The connecting beam 5 is provided with a wheel well mounting interface, and the front facade of the connecting beam 5 is riveted and fixed to the vehicle end wall panel. Since the connecting beam 5 is a bent U-shaped groove structure, the structure is simple, so it is not described in detail in this embodiment with reference to the accompanying drawings.

[0049] As shown in Figure 7, the crossbeam assembly 3 includes a crossbeam 31, a wheel well connecting plate 32, and a reinforcing component assembly 33. The two ends of the crossbeam assembly 3 are riveted and fixed to the first small end plate 12 and the second small end plate 29, respectively. The crossbeam 31 is fixedly connected to the underframe floor and the transverse seats in the passenger compartment.

[0050] When welding the three crossbeam assemblies, first weld the crossbeam 31 and the reinforcing component 33 together, and then connect the wheel well connecting plate 32. The crossbeam 31 provides the riveting interface between the crossbeam assembly 3 and the floor, the small longitudinal beam assembly 1, and the large longitudinal beam assembly 2, and provides some interfaces for the transverse seats in the passenger compartment; the wheel well connecting plate 32 provides the installation interface for the interior wheel wells; the reinforcing component 33 reinforces the parts of the crossbeam assembly 3 with high local stress according to CAE simulation calculations.

[0051] As shown in Figures 8 and 9, the hinged mounting beam 4 is a cast structure, with both ends riveted to the first end plate 17 and the second end plate 27, respectively. The hinged mounting beam 4 mainly includes a hinge seat mounting interface 41, a vehicle end shock absorber interface 42, a riveting mounting interface 43, an upper flange 44, and a transition beam 45. The hinge seat mounting interface 41 mainly provides a mounting interface for the hinge seat of the articulated bogie, including an M20 threaded hole 411, a hinge seat shaft hole 412, a φ10 positioning hole 413, and a trapezoidal cavity 414. The mounting surface protrudes from the casting surface, facilitating machining and ensuring the flatness of the mounting surface. A trapezoidal cavity 414 is provided on the back of the mounting surface according to the hole depth and structural bearing capacity, facilitating demolding during the casting process. The bogie end shock absorber interface 42 primarily provides an installation interface for the bogie end shock absorber, including a φ17 mounting hole 421, a first triangular reinforcing rib 422, and a second triangular reinforcing rib 423. The first triangular reinforcing rib 422 and the second triangular reinforcing rib 423 provide reinforcement support for the bending moment transmitted from the bogie end shock absorber to the hinged mounting beam 4. The riveting installation interface 43 primarily provides a connection surface for the riveting of the hinged mounting beam 4 to the small longitudinal beam component 1 and the large longitudinal beam component 2, and transmits the force transmitted from the bogie to the connected structure. It includes a riveting hole 431, a vertical rib 432, and a riveting surface 433. The riveting hole is a protruding cast surface for easy machining, and the riveting surface is also a machined plane to ensure the flatness of each connection surface. The upper flange 44 connects the hinged seat mounting interface module 41 and the bogie end shock absorber interface module 42 into one unit, improving the overall structural strength. The surface is treated with a trapezoidal cavity for weight reduction, and a smooth transition is made around the perimeter according to the structure and force flow to reduce stress concentration. The transition beam 45 connects the hinged seat mounting interface module 41 and the riveted mounting interface 43, and is weight-reduced according to the force flow.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A chassis connection structure suitable for articulated bogies of straddle-type monorail vehicles, characterized in that, It has a frame structure for connecting the articulated bogie and the underframe and transmitting longitudinal traction force, the frame structure comprising a small longitudinal beam assembly (1), a large longitudinal beam assembly (2), a crossbeam assembly (3) and an articulated mounting beam (4). The small longitudinal beam component (1) includes a small longitudinal beam (11) and a trapezoidal frame (16) located at the front end of the small longitudinal beam (11). The small longitudinal beam (11) is fixed to the base frame floor and is used to transmit longitudinal traction force to the base frame. The main longitudinal beam assembly (2) includes a main longitudinal beam (21), a transition floor (22) located outside the main longitudinal beam (21), and a longitudinal connecting side plate (23) located on the side of the transition floor (22). The transition floor (22) is used to install the floor cloth, and the longitudinal connecting side plate (23) is fixed to the base frame floor. The crossbeam assembly (3) spans across the rear ends of the small longitudinal beam (11) and the large longitudinal beam (21), and the hinged mounting beam (4) spans across the front ends of the trapezoidal frame (16) and the large longitudinal beam (21). The hinged mounting beam (4) is fixedly connected to the hinged bogie. The bending moment of the hinged bogie is smoothly transferred to the base frame floor through the small longitudinal beam assembly (1) and the large longitudinal beam assembly (2).

2. The underframe connection structure for articulated bogies of straddle-type monorail vehicles according to claim 1, characterized in that, The small longitudinal beam (11) is riveted to the base frame floor, the longitudinal connecting side plate (23) is riveted to the base frame floor, the cross beam assembly (3) is riveted to the small longitudinal beam (11) and the large longitudinal beam (21), and the hinged mounting beam (4) is riveted to the trapezoidal frame (16) and the large longitudinal beam (21).

3. The underframe connection structure for articulated bogies of straddle-type monorail vehicles according to claim 1, characterized in that, The small longitudinal beam assembly (1) also includes a first L-shaped column (13) located behind the trapezoidal frame (16), and the large longitudinal beam assembly (2) also includes a second L-shaped column (25) located in front of the large longitudinal beam (21). The upper end of the first L-shaped column (13) and the upper end of the second L-shaped column (25) are connected by a connecting beam (5). The connecting beam (5) is provided with a wheel well installation interface, and the front facade of the connecting beam (5) is riveted and fixed to the vehicle end wall panel.

4. The underframe connection structure for articulated bogies of straddle-type monorail vehicles according to claim 3, characterized in that, The first L-shaped column (13) is fixed with a first connecting beam fixing plate (14) at its upper end, and the second L-shaped column (25) is fixed with a second connecting beam fixing plate (26) at its upper end. The two ends of the connecting beam (5) are respectively fixedly connected to the first connecting beam fixing plate (14) and the second connecting beam fixing plate (26) by bolts.

5. The underframe connection structure for articulated bogies of straddle-type monorail vehicles according to claim 1, characterized in that, The rear end of the small longitudinal beam (11) is provided with a first small end plate (12), and the rear end of the large longitudinal beam (21) is provided with a second small end plate (29). The two ends of the crossbeam assembly (3) are respectively riveted and fixed to the first small end plate (12) and the second small end plate (29).

6. The underframe connection structure for articulated bogies of straddle-type monorail vehicles according to claim 1, characterized in that, The trapezoidal frame (16) has a first end plate (17) at its front end and a second end plate (27) at its front end. The hinged mounting beam (4) is riveted and fixed at both ends to the first end plate (17) and the second end plate (27) respectively.

7. The underframe connection structure for articulated bogies of straddle-type monorail vehicles according to claim 1, characterized in that, The small longitudinal beam assembly (1) also includes a first transverse connecting base plate (15) located behind the small longitudinal beam (11) and extending rearward, and the large longitudinal beam assembly (2) also includes a second transverse connecting base plate (24) located behind the transition floor (22) and extending rearward. The first transverse connecting base plate (15) and the second transverse connecting base plate (24) are respectively riveted and fixed to the base frame floor.

8. The underframe connection structure for articulated bogies of straddle-type monorail vehicles according to claim 1, characterized in that, The front side of the first L-shaped column 13 is provided with a first end wall connecting plate (18), and the front side of the second L-shaped column 15 and the transition floor (22) is provided with a second end wall connecting plate (28). The first end wall connecting plate (18) and the second end wall connecting plate (28) are riveted and fixed to the vehicle end wall panel.

9. The underframe connection structure for articulated bogies of straddle-type monorail vehicles according to claim 1, characterized in that, The crossbeam assembly (3) includes a crossbeam (31), a wheel well connecting plate (32) located on the upper surface of the crossbeam (31), and a reinforcing member (33) inside the crossbeam. The wheel well connecting plate (32) has a wheel well mounting interface, and the crossbeam (31) is fixedly connected to the underframe floor and the passenger compartment transverse seats.

10. The underframe connection structure for articulated bogies of straddle-type monorail vehicles according to claim 1, characterized in that, The hinged mounting beam (4) is a casting with a hinged seat mounting interface (41) and a vehicle end shock absorber mounting interface (42). The hinged seat mounting interface (41) is fixed to the upper hinged seat of the bogie center pin.

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