A new type of end-frame structure suitable for articulated bogies

Abstract

A new type of end bogie structure suitable for articulated bogies, characterized in that it comprises left and right traction beams, upper and lower cover plates, upper and lower end cover plates, left and right side beams, cross beams, end plates and articulated mounting seats; the upper cover plate is fixedly connected with the upper end cover plate; the articulated mounting seat is fixedly connected between the lower cover plate and the lower end cover plate; the end plate is fixedly connected with the upper and lower end cover plates; the cross beam is fixedly connected with the upper and lower cover plates; and the two ends of the left and right side beams are fixedly connected with the two ends of the upper and lower cover plates and the upper and lower end cover plates on the same side respectively; the structure is simple, the interface is less, the assembly precision requirement is low, the stress relationship between the car body and the bogie is simplified, the accuracy of the finite element simulation analysis result is increased, contributions are made to the weight reduction design of the car body and the improvement of the vehicle comfort; compared with the subway end steel bogie, the weight is reduced, the vehicle light weight requirement is met; the interface with the bogie is reduced, and the whole vehicle assembly and unloading time is reduced by 30%.

Description

Technical Field

[0001] This invention belongs to the field of rail vehicle body manufacturing technology, and in particular relates to an end frame structure suitable for articulated bogies. Background Technology

[0002] The advantages of high-floor articulated light rail vehicles include fewer bogies, lighter weight, and better curve-crossing ability. The connection between the articulated bogie and the car body is one of the most crucial connections. Currently, domestically, double-fork and cantilever end frames are used to connect to the articulated bogies. This connection has numerous interfaces, including connections to bearings, articulated turntables, wear-resistant bushings, and other components, resulting in a complex structure and requiring high assembly precision. Furthermore, with the development of the modern rail transit industry, the performance requirements for vehicles navigating tight curves are constantly increasing. Therefore, designing and improving the car body end frame structure with fewer interfaces to the articulated bogies to meet the performance requirements for navigating tight curves has become a critical issue that the rail transit industry urgently needs to address. Summary of the Invention

[0003] The purpose of this invention is to provide a car body end underframe structure that is suitable for articulated bogies, has fewer interfaces, a simple structure, and is easy and quick to assemble, and meets the requirements of vehicle performance on tight curves.

[0004] To achieve the above-mentioned objectives, this invention provides a novel end frame structure suitable for articulated bogies, characterized in that it includes left and right traction beams, upper and lower cover plates, upper and lower end cover plates, left and right side beams, crossbeams, end plates, and articulated mounting seats. The upper cover plate is fixedly connected to the upper end cover plate, and the lower cover plate is fixedly connected to the lower end cover plate via the articulated mounting seat. The end plates are fixedly connected to the upper and lower end cover plates, and the crossbeams are fixedly connected to the upper and lower cover plates and the two ends of the upper and lower end cover plates on the same side, respectively.

[0005] Preferably, the upper and lower end cover plates adopt an M-shaped structure as a whole, and the connection between the two ends and the side beam adopts a semi-dovetail structure to ensure greater structural stability.

[0006] Preferably, the upper and lower cover plates adopt a T-shaped structure design, and the connection between the two ends and the side beam adopts a dovetail structure to ensure greater structural stability.

[0007] Preferably, the side beam adopts a groove design with openings at the connection points with the upper and lower cover plates and the upper and lower end cover plates to ensure that there are no protrusions on the surface of the structure after welding.

[0008] Preferably, the crossbeam is fixedly connected to the edge of the upper crossbeam of the upper and lower cover plates to ensure structural stability.

[0009] Preferably, a U-shaped groove is formed on one side of the end plate, the bottom edge of the U-shaped groove is flush with the outer edge of the upper end cover plate, and the other side of the end plate is fixedly connected to the outer edge of the lower end cover plate.

[0010] Preferably, a mounting stud is provided between the upper end cover plate and the lower end cover plate. A boss is machined at the upper open part of the mounting stud, and the boss is butt-welded to the upper end cover plate. A bolt hole is opened at the bottom of the mounting stud for installing hinge bolts.

[0011] Preferably, the side of the connection end between the right beam and the upper cover plate is provided with a vehicle mounting port for vehicle mounting, lifting, rescue, shunting, coupling, and multi-vehicle grouping and return operations.

[0012] This invention features a simple structure with fewer interfaces and lower assembly precision requirements. It simplifies the stress relationship between the car body and the bogie, increases the accuracy of finite element simulation analysis results, and contributes to the weight reduction design of the car body and the improvement of vehicle comfort. Compared with the steel underframe at the end of the subway, the weight is reduced, meeting the requirements for vehicle lightweighting. The number of interfaces with the bogie is reduced, and the assembly and unloading time of the whole vehicle is reduced by 30%.

[0013] According to research papers and materials, the curve-passing capabilities of high-low floor articulated light rail vehicles currently on the market are basically R40m, R30m, and R25m. This invention patent's design of a high-floor articulated light rail vehicle end frame structure, due to the connection between the sleeper beam and the slewing bearing, increases the relative turning angle between the car body and the bogie, thus enhancing the vehicle's ability to pass small curves, meeting the requirement for passing 25m curves. Attached Figure Description

[0014] Figure 1 Isometric view of the end frame (front)

[0015] Figure 2 Isometric view of the end frame (reverse side)

[0016] Figure 3 Side view of end frame

[0017] Figure 4 Schematic diagram of end cover plate (top)

[0018] Figure 5 Top cover plate diagram

[0019] Figure 6 Hinge mounting base diagram

[0020] Figure 7 Installation stud diagram

[0021] Figure 8 Sectional view of end frame

[0022] Figure 9 End base frame and hinged connection view Detailed Implementation

[0023] like Figure 1 , Figure 2 , Figure 3As shown, a novel end frame structure suitable for articulated bogies comprises an upper end cover plate 1, an upper end cover plate 2, mounting studs 3, a left side beam 4, a right side beam 5, an end plate 6, a crossbeam 7, a right traction beam 8, a bogie frame opening 9, a lower end cover plate 10, a lower end cover plate 11, an articulated mounting base 12, a left traction beam 13, reinforcing beams 14, 15, and 16, a support plate 17, and a support plate 18. The main body of the end frame is made of stainless steel, grade X2CrNiN18-7, meeting EN 10088 standards. The articulated mounting area is made of carbon steel, grade S355, meeting EN 10025 standards.

[0024] like Figures 1-8 As shown, the upper cover plate is made of 8mm thick stainless steel, with an M-shaped design. The connection between area 1-1 and the side beam uses a semi-dovetail structure for added stability. The upper cover plate 2 is also made of 8mm thick stainless steel, with a T-shaped design. The connection between area 2-1 and the side beam uses a dovetail structure for added stability. The mounting studs 3 are 126mm high. Area 3-1 is butt-welded to the upper cover plate 1, while area 3-2 is fixed to the mounting hinge bolts. Side beams 4 and 5 are made of 4mm thick stainless steel, with a channel design and openings at the top and bottom to ensure a smooth surface after welding, breaking away from traditional lap or plug-in structures. The crossbeam 7 is made of 8mm thick stainless steel and primarily bears vertical loads. The traction beam 8 is made of 6mm thick stainless steel and primarily bears longitudinal and vertical loads. The vehicle lifting port 9 is made of 6mm thick stainless steel and plays a crucial role in vehicle lifting and hoisting. The lower cover plate 10 is made of 8mm thick stainless steel with a T-shaped design and a dovetail structure at the connection with the side beam for enhanced stability. The lower end cover plate 11 is also made of 8mm thick stainless steel with an M-shaped design and a semi-dovetail structure at the connection with the side beam for further stability. The hinged mounting base 12 is machined from 60mm forged steel. Area 12-1 contains the through holes for the hinged mounting bolts, area 12-2 is the dovetail structure, area 12-3 is the hinged mounting limiting groove, and area 12-4 is the reinforcing rib. Reinforcing beams 14, 15, and 16, support plates 17 and 18 are made of 8mm thick stainless steel and primarily bear vertical loads.

[0025] All components are connected by arc welding, forming an integral welded structure that ensures the end frame can withstand the EN12663 P-IV strength requirements, as well as a static pressure load of 400KN and a tensile load of 300KN. The stress on the end frame does not exceed the design allowable stress. The design of the lifting port 9 meets the EN 16404 standard, and the strength of the lifting port meets the EN 12663 standard. It also meets the requirements of various operating conditions for lifting, hoisting, rescue, shunting, coupling, and multi-car train repatriation. When the vehicle is in lifting, hoisting, or rerailing operation, the lifting pin is inserted into the lifting port 9, and the above operations are completed using a lifting device or hoisting equipment.

[0026] like Figure 9 The diagram shows the connection between the end base frame and the hinge structure. To ensure the installation accuracy of the end base frame and the hinge, the end base frame is machined as a whole after welding. The hinge structure 19 is installed on the end base frame by fasteners 20 and then connected by a slewing bearing and a hinge bogie.

Claims

1. A new bogie end structure suitable for articulated bogies, characterized in that: The hinge structure comprises left and right traction beams, upper and lower cover plates, upper and lower end cover plates, left and right side beams, a cross beam, an end plate and a hinge mounting seat, the upper cover plate is fixedly connected with the upper end cover plate, the hinge mounting seat is fixedly connected between the lower cover plate and the lower end cover plate, the end plate is fixedly connected with the upper and lower end cover plates, the cross beam is fixedly connected with the upper and lower cover plates, and the two ends of the left and right side beams are fixedly connected with the two ends of the upper and lower cover plates and the upper and lower end cover plates on the same side respectively.

2. A new type of end-bogie structure suitable for articulated bogies as claimed in claim 1, wherein: The upper and lower end cover plates adopt M-shaped structures, and the two ends are connected with the side beams in a half dovetail type structure.

3. A new type of end-frame structure suitable for articulated bogies as claimed in claim 1, characterized in that: The upper and lower cover plates adopt T-shaped structure design, and the two ends are connected with the side beams in a dovetail type structure.

4. A new type of end-frame structure suitable for articulated bogies according to claim 1, characterized in that: The side beams adopt a groove type design, and the connecting parts with the upper and lower cover plates and the upper and lower end cover plates are opened to ensure that the structure surface is free of protrusions after welding.

5. A new type of end-frame structure suitable for articulated bogies as claimed in claim 1, characterized in that: The cross beam is fixedly connected with the edges of the upper part of the upper and lower cover plates.

6. A new type of end-frame structure suitable for articulated bogies as claimed in claim 1, characterized in that: One side of the middle of the end plate is provided with a U-shaped groove, the bottom edge of the U-shaped groove is flush with the outer edge of the upper end cover plate, and the other side of the end plate is fixedly connected with the outer edge of the lower end cover plate.

7. A new type of end-frame structure suitable for articulated bogies according to claim 1, characterized in that: The connecting end of the right side beam with the upper end cover plate is provided with a vehicle lifting opening.

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