Railway vehicle and bogie mounting structure

Abstract

The application discloses a rail train and a bogie mounting structure. The bogie mounting structure comprises a bogie bearing structure, an end structure and a bogie. The bogie bearing structure comprises a bogie side beam, an end side floor, a pillow side floor, a pillow inner floor and a long floor. The end structure comprises a pillow beam, a traction beam and a transition plate. The pillow beam and the traction beam are partially embedded in the interior of the bogie bearing structure. The bogie comprises rubber wheels, steel wheels, guide wheels, a rotary support structure and a framework. The rubber wheels are located outside the steel wheels. The framework is fixed below the end structure through the rotary support structure. A side beam notch is arranged below the bogie side beam and located at the front and back positions of the pillow beam. The side beam notch is distributed at the corresponding position of the rubber wheels to provide a movement space for the rubber wheels. The application solves the problems of small radius and large slope climbing of a large-capacity rubber wheel subway system and the strength problem of the vehicle body itself.

Description

TECHNICAL FIELD

[0001] The present application relates to a rail train and bogie mounting structure, and belongs to the technical field of rail vehicles. BACKGROUND

[0002] At present, the steel wheel and rail transportation system has achieved a dominant position in the field of rail vehicles due to its high speed, large axle load and large carrying capacity. In the field of subway vehicles with large carrying capacity, the steel wheel and rail transportation system also occupies an absolute market share. However, the steel wheel and rail transportation system still has problems to be solved, such as high noise, low climbing ability and large curve passing radius. The steel wheel and rubber wheel co-driving bogie can overcome these weaknesses.

[0003] CN109131413A discloses a steel wheel and rubber wheel co-driving bogie and its transportation system, which couples the rubber wheel and the steel wheel together, and selectively uses the steel wheel and rail system or the rubber wheel and rail system according to the passenger flow density, road conditions and operation performance requirements. However, the connection between the bogie and the car body of the patent scheme adopts the traction seat and air spring connection mode of the traditional subway vehicle, which limits the ability of the train to pass through small radius curves.

[0004] EP1557337A1 discloses a chassis, and the floor is directly hollowed out in the wheel pair area, and the profile is arranged transversely, and the traction and buffering structure is directly processed, which is greatly different from the existing vehicle structure, and the manufacturing tooling needs to be adjusted greatly.

[0005] The connection between the bogie and the car body by the rotary support structure is conducive to enhancing the small radius curve passing ability of the train, so that the train can run in more demanding urban conditions, greatly improving the adaptability and versatility of the train.

[0006] However, the steel wheel and rubber wheel co-driving bogie with rotary support structure connection is larger in size than the conventional subway bogie, and the car body needs to be notched or designed compactly to reserve the movement space of the wheel pair and the frame, which is not conducive to the strength performance of the car body structure, and the installation of the rotary support structure on the car body needs to be solved, and the traditional subway car body bolster structure cannot meet the installation requirements. The structure of the light rail vehicle with rubber wheel system has lower bearing performance than the subway vehicle, and its installation structure cannot be directly transferred to the subway vehicle for application. SUMMARY

[0007] The present application aims to provide a rail train and bogie mounting structure, which can at least solve one of the following problems:

[0008] 1. The subway vehicle with large carrying capacity has insufficient small radius passing ability;

[0009] 2. The body local position for installing the steel wheel and rubber wheel co-driving bogie needs to be excavated to avoid interference, resulting in the decline of the structural strength performance of the body;

[0010] 3. The existing metro car body bogie bolster is narrow in width, and the cavity structure is mostly closed, which cannot meet the installation requirements of the rotary support structure;

[0011] 4. The existing car body usually adopts a carbon steel disc connected with the rotary support structure, which is heavy in structure and not energy-saving;

[0012] 5. The rail system noise is large, and the body needs to provide sufficient sound insulation function.

[0013] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0014] A bogie mounting structure, comprising a bogie carrying structure and an end structure located at both ends of the bogie carrying structure, and a bogie fixed below the end structure; the structural characteristics are:

[0015] The bogie carrying structure comprises a bogie side beam, an end side floor, a bolster side floor, an inner bolster floor and a long floor;

[0016] The end structure comprises a bolster, a traction beam and a transition plate; the bolster and the traction beam are partially embedded in the interior of the bogie carrying structure; the traction beam, the bolster and the transition plate are arranged in turn from the end to the center of the vehicle; the bolster is connected with the bogie side beam;

[0017] The end side floor is located on both sides of the traction beam, the bolster side floor is located on both sides of the bolster, and the inner bolster floor is located at the center of the bolster;

[0018] The bogie comprises rubber wheels, steel wheels, guide wheels, a rotary support structure and a frame; the rubber wheels are located on the outer side of the steel wheels, and the frame is fixed below the end structure through the rotary support structure;

[0019] The bogie side beam below is provided with a side beam notch located at the front and rear positions of the bolster, and the side beam notch is distributed at the corresponding position of the rubber wheel to provide a movement space for the rubber wheel.

[0020] The present application creatively processes notches in the bogie side beam in front of and behind the bolster, solves the problem of interference between the movement space of the wheel set in the bolster area and the existing bolster structure, and arranges the traction beam and the transition plate structure in front of and behind the bolster, solving the problem of insufficient local strength after the side beam is processed with notches.

[0021] According to the embodiments of the present application, the present application can be further optimized, and the following is the technical scheme formed after optimization:

[0022] In one preferred embodiment, the truss includes a truss floor, a truss upright, a spar, a cabinet floor and an end beam; the cabinet floor is located between the end beam and the spar, the truss upright is located behind the spar, and the truss floor is located between the two truss uprights; preferably, the end beam and the spar are arranged in parallel.

[0023] In one preferred embodiment, the truss upright is used to transfer the load in the longitudinal direction, the end beam, the spar and the double-layer cabinet floor are used to transfer the load in the transverse direction.

[0024] In one preferred embodiment, the upper surface of the cabinet floor is flush with the upper surface of the end-side floor; the upper surface of the truss floor is flush with the upper surface of the end-side floor.

[0025] In one preferred embodiment, the bolster includes two bolster crossbeams and two bolster stringers, the bolster crossbeams and the bolster stringers are arranged perpendicularly, the middle part of the crossbeam lower web plate of the bolster crossbeam and the middle part of the stringer lower web plate of the bolster stringer have two adjacent and concentric outer and inner groove circles, and a plurality of recessed bolt holes and through bolt holes are formed in the inner groove.

[0026] In one preferred embodiment, the bolster crossbeam is a multi-cavity profile structure, the lower surface of the bolster crossbeam is provided with a crossbeam lower web plate, and the interior of the bolster crossbeam is provided with an inclined web plate and a vertical web.

[0027] In one preferred embodiment, the inner groove of the lower surface of the crossbeam lower web plate and the stringer lower web plate is provided with a plurality of groups of holes, each group of holes is composed of two recessed bolt holes and two through bolt holes, the through bolt holes are located outside the recessed bolt holes, and each of the bolster crossbeams and the bolster stringers is formed with two groups of holes that are symmetrically distributed; each group of holes corresponds to a set of threaded plate fastening system.

[0028] In one preferred embodiment, the two ends of the bolster crossbeam have a first end portion notch and a second end portion notch, the first end portion notch is arranged on the crossbeam lower web plate and the inclined web plate, and is used to provide a welding space for the weld joint between the vertical web and the chassis side beam; after the welding is completed, the first end portion notch is fixedly connected with the bolster closure plate.

[0029] In one preferred embodiment, the side beam notch provides a mounting space when the second end portion notch is inserted into the threaded plate.

[0030] In one preferred embodiment, the rotary support structure is fixed to the bolster of the end structure by a threaded plate fastening system; preferably, the threaded plate fastening system comprises a threaded plate, a first bolt and a second bolt; the threaded plate is provided with holes, the first and second bolts pass through the holes and connect the rotary support structure and the end structure together; the second end notch is arranged on the lower beam rib plate to provide a space for the threaded plate.

[0031] The bolster longitudinal beam and the bolster cross beam are double-layer cavity structures, and the cross beam is provided with notches at both ends for inserting the threaded plates used for fixing the bogie.

[0032] In one preferred embodiment, the threaded plate is inserted into the bolster cross beam through the first end notch, and is inserted into the bolster longitudinal beam through the longitudinal beam process hole; the threaded plate is fixed in the cavity of the bolster cross beam and the bolster longitudinal beam by the first bolt at the recess bolt hole position, and is used for mounting the rotary support structure.

[0033] In one preferred embodiment, the rotary support structure comprises a first rotary body, a second rotary body and a ball, and the first rotary body and the second rotary body can move relatively under the action of the ball. In this way, the bogie and the bolster part of the car body are connected through the rotary support structure with the ball.

[0034] In one preferred embodiment, the bolster and the side beam of the underframe form a "eye" type structure; preferably, the end structure further comprises a wire passing pipe and a bolster sealing plate, wherein the wire passing pipe is embedded in the bolster; the bolster and the side beam of the underframe are connected through the bolster sealing plate.

[0035] In one preferred embodiment, the long floor lower surface is provided with a flat rib plate, and the side beam notch extends to the position of the flat rib plate.

[0036] In one preferred embodiment, the end side floor, the bolster side floor, the bolster inner floor, the long floor, the traction beam floor and the screen cabinet floor all adopt a double-layer closed cavity structure. The double-layer structure is adopted for the seven floors inside and behind the bolster, so that the working noise of the bogie is effectively isolated from being transmitted to the car.

[0037] In one preferred embodiment, the end side floor, the bolster side floor, the bolster inner floor and the long floor have the same height.

[0038] Based on the same inventive concept, the application further provides a railway train comprising a plurality of vehicles, each vehicle comprising a car body upper structure, a coupler system and the bogie mounting structure, and adjacent two vehicles are connected through the coupler system; the car body upper structure and the end structure are respectively arranged above the underframe bearing structure, the coupler system is horizontally fixed to the end side of the end structure, and the car body upper structure is provided with a door opening for passengers above the end structure area.

[0039] Thus, the rail train of the present application is provided with steel wheel and rubber wheel co-driving bogies at both ends of the underframe of each car body, and the vehicles are connected through couplers.

[0040] The car body underframe bolster adopts a frame structure, and is connected with the side beams of the underframe to form a 'eye' shaped structure, and two concentric circular grooves are processed in the middle'mouth' shaped structure part of the 'eye' shaped structure for connecting with the circular rotary support bodies of the two-axle bogie frames.

[0041] Compared with the prior art, the rail train of the present application has the following advantages:

[0042] 1) The train has the performances of large capacity and passing through small radius curves at the same time, and is suitable for more severe operation line conditions, and the universality is greatly improved;

[0043] 2) The 'eye' shaped bolster structure has good overall bearing performance, and the open notches are processed in the two end parts of the multilayer cavity structure for inserting the threaded blocks, and the structure is simple and has high reliability;

[0044] 3) The vehicle has good sound insulation performance, and provides a comfortable space for passengers in the car;

[0045] 4) The light weight effect is good by using the aluminum alloy profile groove structure instead of the carbon steel disc. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is a vehicle structure schematic view of an embodiment of the present application;

[0047] Figure 2 is a bottom view of the underframe structure of the present application;

[0048] Figure 3 is a partial view of the car body structure of the present application;

[0049] Figure 4 is an exploded view of the underframe structure of the present application;

[0050] Figure 5 is a B-B view of the present application; Figure 3

[0051] Figure 6 is a schematic view of the bolster structure of the present application;

[0052] Figure 7 is a partial enlarged view of the present application; Figure 6

[0053] Figure 8 is a cross-sectional view of the bolster cross beam profile of the present application;

[0054] Figure 9 ​​is a bogie and car body connecting structure schematic diagram of the present application;

[0055] Figure 10 is a threaded plate fastening system schematic diagram of the present application;

[0056] Figure 11 is the A-A view of the present application Figure 1

[0057] Figure 12 is the C-C view of the present application Figure 11

[0058] Figure 13 is the D-D view of the present application Figure 11

[0059] Figure 14 is a slewing support installation schematic diagram of the present application.

[0060] In Figures 1 to 14 :

[0061] car body upper structure 1, door hole 1a, underframe bearing structure 2, underframe side beam 21, side beam notch 21a, flat muscle plate 211, end side floor 22, pillow side floor 23, pillow inner floor 24, long floor 25, end structure 3, pillow beam 31, outer ring groove 31a, inner ring groove 31b, concave platform bolt hole 31c, through bolt hole 31d, pillow beam cross beam 311, first end part notch 311a, second end part notch 311b, cross beam lower muscle plate 3111, inclined muscle plate 3112, vertical muscle 3113, pillow beam longitudinal beam 312, longitudinal beam process hole 312a, longitudinal beam lower muscle plate 3121, traction beam 32, traction beam floor 321, traction beam vertical plate 322, wing beam 323, screen cabinet floor 324, end beam 325, transition plate 33, wire passing pipe 34, pillow beam sealing plate 35, bogie 4, rubber wheel 41, steel wheel 42, guide wheel 43, slewing support structure 44, first slewing body 441, second slewing body 442, ball 443, framework 45, hook buffer system 5, threaded plate fastening system 6, threaded plate 61, first bolt 62, second bolt 63, bolt system three 7. DETAILED DESCRIPTION

[0062] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "up", "down", "left", "right" appear in the following text, they only mean the same direction as the up, down, left and right of the drawings, and do not limit the structure.

[0063] As Figure 1 ​​​As shown in the vehicle configuration diagram, the rail vehicle structure of this embodiment includes a vehicle body superstructure 1, an underframe supporting structure 2, an end structure 3, a bogie 4, and a coupler and buffer system 5. The vehicle body superstructure 1 and the end structure 3 are respectively located above the underframe supporting structure 2, the bogie 4 is fixed below the end structure 3, and the coupler and buffer system 5 is horizontally fixed to the end side of the end structure 3. Above the end structure 3, the vehicle body superstructure 1 is provided with a door opening 1a for passenger entry and exit.

[0064] Figure 2 It is the upward-looking surface of the chassis structure. Figure 3 This is a partial view of the vehicle body structure. Figure 4 This is an exploded view of the chassis structure. Figure 5 yes Figure 3 BB view. The chassis bearing structure 2 is mainly composed of the chassis side beam 21, the end side floor 22, the pillow side floor 23, the pillow inner floor 24 and the long floor 25, among which the end side floor 22, the pillow side floor 23, the pillow inner floor 24 and the long floor 25 can be set to the same height. The end structure 3 is mainly composed of the bolster 31, the traction beam 32, the transition plate 33, the wire tube 34 and the bolster sealing plate 35, among which the traction beam 32, the bolster 31 and the transition plate 33 are arranged in sequence from the end to the center of the vehicle, and the wire tube 34 is embedded in the bolster 31 for the passage of electrical cables and brake lines. The bolster sealing plate 35 is located at the four corners of the bolster 31 and is used to connect the bolster 31 and the chassis side beam 21. The hook buffer system 5 is located at both ends of the chassis bearing structure 2 and is fixed on the side of the traction beam 32 for connecting other cars in the front and rear.

[0065] The traction beam 32 is mainly composed of a traction beam floor 321, a traction beam vertical plate 322, a wing beam 323, a screen cabinet floor 324 and an end beam 325. The end beam 325 is arranged parallel to the wing beam 323, and the screen cabinet floor 324 is located between the end beam 325 and the wing beam 323, with its upper surface flush with the upper surface of the end side floor 22. The traction beam vertical plate 322 is located behind the wing beam 323, and the traction beam floor 321 is located between the two traction beam vertical plates 322, with its upper surface flush with the upper surface of the end side floor 22. The traction beam 32 has a compact structure. The traction beam vertical plate 322 transmits longitudinal loads, while the end beam 325, the wing beam 323 and the double-layer structure of the screen cabinet floor 324 can transmit lateral loads, effectively solving the problem of longitudinal and lateral load transmission of the coupling buffer system 5 when the train has a very small radius.

[0066] At the front and rear positions of the bolster 31, a side beam notch 21a of a certain length is set below the chassis side beam 21, and the notch is processed to the position of the flat rib plate 211 parallel to the lower surface of the long floor 25, thereby ensuring the movement space required by the bogie 4 to the greatest extent.

[0067] The end structure 3 is located at both ends of the chassis bearing structure 2, the bolster beam 31 and the traction beam 32 are partially embedded in the interior of the chassis bearing structure 2, the end part of the long floor 25 of the chassis bearing structure 2 is broken and decomposed, and five short floors are added, including two end side floors 22 located on both sides of the traction beam 32, two bolster side floors 23 located on both sides of the bolster beam 31, and one bolster inner floor 24 located in the center of the bolster beam 31. The bolster beam 31 and the traction beam 32 maintain structural continuity, and a plurality of transition plates 33 are arranged on the rear side of the bolster beam 31, and the bolster beam 31 and the chassis side beam 21 form a "eye" type structure, which has good overall rigidity and strength, and is beneficial to overcome the problem of insufficient car body stiffness caused by the door opening 1a and the side beam gap 21a located below the door opening.

[0068] The end side floor 22, the bolster side floor 23, the bolster inner floor 24 and the long floor 25, and the traction beam floor 321 and the screen cabinet floor 324 all adopt a double-layer closed cavity structure, which is beneficial to improve the sound insulation effect of the bogie area and avoid the noise generated during the operation of the bogie from being transmitted to the passengers in the passenger compartment, thereby improving the comfort of the car.

[0069] Figure 6 is a schematic view of a bolster structure, Figure 7 is Figure 6 is a local enlarged view of Figure 8 is a cross-sectional view of a bolster cross beam profile. The bolster beam 31 is mainly composed of two long bolster cross beam 311 and two short bolster longitudinal beam 312. The bolster cross beam 311 and the bolster longitudinal beam 312 are arranged vertically. Two adjacent and concentric outer groove 31a and inner groove 31b are machined in the middle of the cross beam lower rib plate 3111 of the bolster cross beam 311 and the longitudinal beam lower rib plate 3121 of the bolster longitudinal beam 312. A plurality of recessed bolt holes 31c and through bolt holes 31d are machined in the inner groove 31b.

[0070] The bolster cross beam 311 is a multi-cavity profile structure, the lower surface is provided with a cross beam lower rib plate 3111, the inside is provided with an inclined rib plate 3112 and a vertical rib 3113. The first end notch 311a and the second end notch 311b are machined at both ends of the bolster cross beam 311. The first end notch 311a cuts off the cross beam lower rib plate 3111 and the inclined rib plate 3112, which is used to provide a welding space for the welding between the vertical rib 3113 and the chassis side beam 21. After welding is completed, the bolster sealing plate 35 is supplemented and welded around to strengthen the local strength of this part. The second end notch 311b cuts off the cross beam lower rib plate 3111, which is used to provide a space for inserting the threaded plate 61.

[0071] Figure 9This is a schematic diagram of the bogie-carriage connection structure. The bogie 4 primarily consists of a rubber wheel 41, a steel wheel 42, a guide wheel 43, a slewing support structure 44, and a frame 45. The rubber wheel 41 is located outside the steel wheel 42. The bogie 4 is secured to the underside of the end structure 3 via the slewing support structure 44. The side beam notches 21a on the underframe side beam 21 correspond to the rubber wheel 41, providing space for movement and allowing the threaded plate 61 to be inserted into the second end notch 311b.

[0072] Figure 10 This is a schematic diagram of a threaded plate fastening system. The threaded plate fastening system 6, used to secure the slewing support structure 44 to the end structure 3, consists of a threaded plate 61, a first bolt 62, and a second bolt 63. The threaded plate 61 has four holes: the center two for the first bolts 62 and the outer two for the second bolts 63.

[0073] Figure 11 yes Figure 1 AA view, Figure 12 yes Figure 11 CC view, Figure 13 yes Figure 11 DD view. Eight groups of holes are machined into the inner groove 31b on the lower surfaces of the crossbeam lower rib 3111 and the longitudinal beam lower rib 3121. Each group consists of two recessed bolt holes 31c and two through-bolt holes 31d, with the through-bolt holes 31d located outside the recessed bolt holes 31c. Each bolster crossbeam 311 and longitudinal beam 312 is machined with two symmetrically distributed groups of holes. All holes are arranged in a circular pattern on the horizontal plane.

[0074] Each set of holes corresponds to a threaded plate fastening system 6. The threaded plate 61 is inserted into the bolster crossbeam 311 through the first end notch 311a. The threaded plate 61 is inserted into the bolster longitudinal beam 312 through the longitudinal beam process hole 312a. The threaded plate 61 is then secured to the cavities of the bolster crossbeam 311 and longitudinal beam 312 using first bolts 62 at the recessed bolt holes 31c. This is then used to install the slewing support structure 44.

[0075] Figure 14 The slewing support structure 44 is mainly composed of a first slewing body 441 , a second slewing body 442 and a ball 443 . The first slewing body 441 and the second slewing body 442 can move relative to each other under the action of the ball 443 .

[0076] The installation steps for fixing the bogie 4 on the bolster 31 are as follows:

[0077] Step 1: Fix the slewing support structure 44 to the bolster 31 using the threaded plate 61 and the second bolt 63 of the threaded plate fastening system 6;

[0078] Step 2: The bogie 4 is fixed on the rotary support structure 44 by the bolt system three 7, and the installation of the bogie 4 is completed.

[0079] At the corresponding position of the bolt system three 7, the tie beam 31 is pre-processed with an outer ring groove 31a to provide the installation and movement space of the bolt head in the bolt system three 7.

[0080] The bottom frame tie beam of the embodiment adopts a frame structure, and the two sides are connected with the bottom frame side beam to form a "eye" type structure, which is connected with the "eye" type two-axle bogie frame through a circular rotary support body, solves the problem of small radius and large slope climbing of the large-capacity rubber-tyred metro system, and solves the problem of the strength of the vehicle body itself. By optimizing the structure of the tie beam, the connection mode of the vehicle body and the bogie is innovated, and the problem of the movement space of the wheel set in the tie beam area interfering with the existing tie beam structure is solved. The embodiment can effectively reduce the weight by replacing the carbon steel disc with an aluminum alloy profile slot structure.

[0081] The content illustrated in the above embodiments should be understood as that the embodiments are only used to more clearly illustrate the present application, and are not used to limit the scope of the present application. After reading the present application, various equivalent modifications of the embodiments made by those skilled in the art all fall within the scope defined by the appended claims of the present application.

Claims

1. A bogie mounting structure, comprising an underframe bearing structure (2), end structures (3) located at both ends of the underframe bearing structure (2), and a bogie (4) fixed below the end structures (3); characterized in that: The chassis bearing structure (2) includes chassis side beams (21), end side floors (22), pillow side floors (23), pillow inner floors (24), and long floors (25); The end structure (3) includes a bolster (31), a traction beam (32) and a transition plate (33); the bolster (31) and the traction beam (32) are partially embedded in the interior of the chassis bearing structure (2); the traction beam (32), the bolster (31) and the transition plate (33) are arranged in sequence from the end to the center of the vehicle, and the bolster (31) is connected to the chassis side beam (21); The end side floorboards (22) are located on both sides of the traction beam (32), the pillow side floorboards (23) are located on both sides of the pillow beam (31), and the pillow inner floorboards (24) are located at the center of the pillow beam (31); The bogie (4) comprises a rubber wheel (41), a steel wheel (42), a guide wheel (43), a slewing support structure (44) and a frame (45); wherein the rubber wheel (41) is located outside the steel wheel (42), and the frame (45) is fixed below the end structure (3) via the slewing support structure (44); A side beam notch (21a) is provided below the chassis side beam (21) and is located in front of and behind the bolster beam (31). The side beam notch (21a) is distributed at a position corresponding to the rubber wheel (41), providing movement space for the rubber wheel (41).

2. The bogie mounting structure according to claim 1, characterized in that: The traction beam (32) comprises a traction beam floor (321), a traction beam vertical plate (322), a wing beam (323), a screen cabinet floor (324) and an end beam (325); the screen cabinet floor (324) is located between the end beam (325) and the wing beam (323), the traction beam vertical plate (322) is located behind the wing beam (323), and the traction beam floor (321) is located between the two traction beam vertical plates (322).

3. The bogie mounting structure according to claim 2, characterized in that: The end beam (325) is arranged in parallel with the wing beam (323).

4. The bogie mounting structure according to claim 2, characterized in that: The traction beam uprights (322) are used to transmit longitudinal loads, and the end beams (325), wing beams (323) and the double-layer structured panel cabinet floor (324) are used to transmit transverse loads.

5. The bogie mounting structure according to claim 2, characterized in that: The upper surface of the screen cabinet floor (324) is flush with the upper surface of the end side floor (22); and the upper surface of the traction beam floor (321) is flush with the upper surface of the end side floor (22).

6. The bogie mounting structure according to claim 1, characterized in that: The bolster (31) comprises two bolster cross beams (311) and two bolster longitudinal beams (312), wherein the bolster cross beams (311) and the bolster longitudinal beams (312) are arranged vertically, and the middle portion of the lower rib plate (3111) of the cross beam of the bolster cross beam (311) and the lower rib plate (3121) of the longitudinal beam of the bolster longitudinal beam (312) are provided with two adjacent and concentric outer ring grooves (31a) and inner ring grooves (31b), and a plurality of concave platform bolt holes (31c) and through bolt holes (31d) are machined in the inner ring groove (31b).

7. The bogie mounting structure according to claim 6, characterized in that: The bolster cross beam (311) is a multi-cavity profile structure. The lower surface of the bolster cross beam (311) is provided with a cross beam lower rib plate (3111), and the interior of the bolster cross beam (311) is provided with an inclined rib plate (3112) and a vertical rib (3113).

8. The bogie mounting structure according to claim 7, characterized in that: Multiple groups of holes are provided in the inner ring groove (31b) on the lower surfaces of the cross beam lower rib plate (3111) and the longitudinal beam lower rib plate (3121). Each group of holes consists of two counterbore bolt holes (31c) and two through bolt holes (31d), and the through bolt holes (31d) are located outside the counterbore bolt holes (31c). Two sets of holes distributed symmetrically are machined on each bolster cross beam (311) and bolster longitudinal beam (312); each set of holes corresponds to a threaded plate fastening system (6).

9. The bogie mounting structure according to claim 6, characterized in that: Both ends of the bolster cross beam (311) have a first end notch (311a) and a second end notch (311b). The first end notch (311a) is provided on the cross beam lower rib plate (3111) and the inclined rib plate (3112) to provide a welding space for the weld between the vertical rib (3113) and the underframe side beam (21). After welding is completed, the first end notch (311a) is fixedly connected to the bolster sealing plate (35).

10. The bogie mounting structure according to claim 9, characterized in that: The side beam notch (21a) provides an installation space when the second end notch (311b) is inserting the threaded plate (61).

11. The bogie mounting structure according to claim 9, characterized in that: The slewing support structure (44) is fixed on the bolster (31) of the end structure (3) through the threaded plate fastening system (6).

12. The bogie mounting structure according to claim 11, characterized in that: The threaded plate fastening system (6) includes a threaded plate (61), a first bolt (62), and a second bolt (63); holes are provided on the threaded plate (61), and the first bolt (62) and the second bolt (63) pass through the corresponding holes and connect the slewing support structure (44) and the end structure (3) together; the second end notch (311b) is provided on the cross beam lower rib plate (3111) to provide a inserting space for the threaded plate (61).

13. The bogie mounting structure according to claim 11, characterized in that: The threaded plate (61) is inserted into the bolster cross beam (311) through the first end notch (311a); the threaded plate (61) is inserted into the bolster longitudinal beam (312) through the longitudinal beam process hole (312a); at the position of the counterbore bolt hole (31c), the threaded plate (61) is fixed in the cavities of the bolster cross beam (311) and the bolster longitudinal beam (312) through the first bolt (62) for installing the slewing support structure (44).

14. The bogie mounting structure according to any one of claims 1 to 13, characterized in that: The slewing support structure (44) includes a first slewing body (441), a second slewing body (442), and balls (443). The first slewing body (441) and the second slewing body (442) can move relative to each other under the action of the balls (443).

15. The bogie mounting structure according to any one of claims 1 to 13, characterized in that: The bolster (31) and the underframe side beam (21) form an "eye" - shaped structure.

16. The bogie mounting structure according to claim 15, characterized in that: The end structure (3) further includes a cable duct (34) and a bolster sealing plate (35), where the cable duct (34) is embedded inside the bolster (31); the bolster (31) and the underframe side beam (21) are connected through the bolster sealing plate (35).

17. The bogie mounting structure according to any one of claims 1 to 13, characterized in that: A flat rib plate (211) is provided on the lower surface of the long floor (25), and the edge beam notch (21a) extends to the position of the flat rib plate (211).

18. The bogie mounting structure according to any one of claims 1 to 13, characterized in that: The end side floor (22), the pillow side floor (23), the pillow inner floor (24), the long floor (25), the traction beam floor (321), and the screen cabinet floor (324) all adopt a double-layer closed cavity structure.

19. The bogie mounting structure according to any one of claims 1 to 13, characterized in that: The end side floor (22), the pillow side floor (23), the pillow inner floor (24) and the long floor (25) are all of the same height.

20. A rail train comprising a plurality of vehicles, each vehicle comprising a vehicle body superstructure (1), a coupler and buffer system (5) and a bogie mounting structure according to any one of claims 1 to 19, wherein two adjacent vehicle sections are connected via the coupler and buffer system (5); characterized in that: The vehicle body superstructure (1) and the end structure (3) are respectively located above the underframe bearing structure (2); the hook buffer system (5) is horizontally fixed to the end side of the end structure (3); and above the end structure (3) region, the vehicle body superstructure (1) is provided with a door opening (1a) for passengers to enter and exit.

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