Cladding structure for bogie, bogie assembly and rail vehicle

Abstract

A cladding structure (100) for a bogie (200), comprising a bottom plate (1), wherein the bottom plate (1) is used for cladding the bottom of the bogie (200), an opening portions (1a) are provided in the bottom plate (1), and the opening portions (1a) are used for avoiding wheels (23) of a rail vehicle. Further disclosed are a bogie assembly and a rail vehicle. The cladding structure (100) clads the bottom of the bogie (200), and when flowing through the bottom of the bogie (200), an airflow directly flows away through a bottom surface of the bottom plate (1), thereby reducing the aerodynamic resistance in the area of the bogie (200). Each opening portion (1a) occupies a small space, which can reduce the effect of the resistance caused by the airflow entering the bogie (200) from the opening portion (1a), without affecting the effect of the cladding structure (100) reducing the running resistance.

Description

[0001] The present application claims the priorities to the following three Chinese Patent Applications, the entire contents of which are incorporated herein by reference. 1. Chinese Patent Application No. 202310796439.9, titled "CLADDING DEVICE FOR BOGIE, BOGIE AND RAIL VEHICLE", filed with the China National Intellectual Property Administration on June 30, 2023; 2. Chinese Patent Application No. 202310796806.5, titled "CLADDING STRUCTURE, BOGIE ASSEMBLY AND RAIL VEHICLE", filed with the China National Intellectual Property Administration on June 30, 2023; and 3. Chinese Patent Application No. 202321707911.9, titled "BOGIE DEVICE AND RAIL VEHICLE", filed with the China National Intellectual Property Administration on June 30, 2023. FIELD

[0002] The present application relates to the technical field of rail vehicles and, in particular, to a cladding structure for a bogie, a bogie assembly, and a rail vehicle.BACKGROUND

[0003] A high-speed multiple unit includes a bogie provided at the bottom of a vehicle body. The bogie has a complex structure, and includes a framework. In addition to wheels and brake discs, various components such as suspension, anti-yaw damper and anti-roll torsion bar may be amounted on the framework. During running, a large aerodynamic resistance is generated when airflow passes through a bogie region, which influences the energy consumption of a vehicle during running.SUMMARY

[0004] The present application provides a cladding structure including a base plate configured to clad a bottom portion of the bogie. The base plate is provided with opening portions for avoiding wheels of a rail vehicle respectively.

[0005] In an embodiment, the opening portion is a notch formed in an end portion of the base plate; and / or, a guard plate extending upwardly is provided at an edge of the opening portion.

[0006] In an embodiment, the base plate is provided with a sunken portion for receiving a brake disc of the bogie, and the sunken portion includes a wall bulging downwardly with respect to a bottom surface of the base plate, and an outer surface which is streamlined.

[0007] In an embodiment, the outer surface of the sunken portion is in a spindle shape or a drop shape.

[0008] In an embodiment, each of two side edges of the base plate extends upwardly to form a side flange, and / or, each of end edges of the base plate extends upwardly to form an end flange.

[0009] In an embodiment, a mounting arm is further included. The mounting arm includes a first connecting seat and a second connecting seat. The first connecting seat is connected to the base plate, and the second connecting seat is connected to an end portion of a side sill of the bogie.

[0010] In an embodiment, a sand spreading device and / or an obstacle removal device is mounted on the mounting arm.

[0011] In an embodiment, the mounting arm is disposed at the opening portion. A side edge of the opening portion is provided with a side flange extending upwardly, and the first connecting seat includes a U-shaped plate which is engaged with and fixed to the side flange.

[0012] In an embodiment, the cladding structure further includes a support skeleton, which is fixed to the base plate and configured to be connected with a framework of the bogie.

[0013] The present application further provides a bogie assembly including a bogie and a cladding structure cladding the bottom portion of the bogie and being the cladding structure for the bogie as described in any one of the foregoing embodiments.

[0014] The present application further provides a rail vehicle including the bogie assembly described in any one of the foregoing embodiments.

[0015] The cladding structure according to the present application can clad the bottom portion of the bogie, so that the airflow, when flowing past the bottom portion of the bogie, will not flow into complex components within the bogie, but will flow away directly along a bottom surface of the base plate, thereby reducing an aerodynamic resistance to which the bogie region is subjected, and reducing the energy consumption of the vehicle during running. In addition, the base plate is provided with the opening portion for avoiding the wheel. Since the cladding structure is fixed to the framework of the bogie with less relative movement to the wheel, the opening portion located for avoiding the wheel occupies a small space, so that the influence of the resistance caused by the airflow flowing into the bogie through the opening portion can be mitigated, without influencing the effect of the cladding structure in reducing the resistance during running.

[0016] The present application further provides a cladding structure for a bogie. The cladding structure is configured to clad a bottom portion of the bogie, and the bogie is provided with a framework body and an axle-mounted brake disc. The cladding structure for a bogie includes: a mounting crossbeam for fixedly connecting to the framework body of the bogie; and at least two mounting plates fixedly disposed on the mounting crossbeam. At least one of the mounting plates is configured to be fixedly connected to the framework body of the bogie, and at least one of the mounting plates is provided with an accommodating portion for accommodating the axle-mounted brake disc A bottom portion of the accommodating portion bulges from an outer surface of the mounting plate.

[0017] Optionally, the portion of the accommodating portion bulging from the outer surface of the mounting plate is in a spindle shape.

[0018] Optionally, at least one of the mounting plates is detachably mounted on the mounting crossbeam by a mortise and tenon structure.

[0019] Optionally, the mounting crossbeam includes a first mounting crossbeams and a second mounting crossbeam arranged in parallel, and each of the first mounting crossbeam and the second mounting crossbeam is arranged perpendicular to a traveling direction of the bogie. The mounting plate includes two side plates, two end plates and an access door. The two side plates are disposed at opposite ends in a lengthwise direction of the first mounting crossbeam and the second mounting crossbeam respectively; the two end plates are disposed at a front end of the first mounting crossbeam and a rear end of the second mounting crossbeam respectively; and the access door is disposed between the front end of the first mounting crossbeam and the second mounting crossbeam.

[0020] The accommodating portion is provided on the end plate.

[0021] Optionally, one of the access door and the first mounting crossbeam is provided with a first protruding part, and the other of the access door and the first mounting crossbeam is provided with a first recess that matches with the first protruding part. The first protruding part is inserted in the first recess.

[0022] At least one of the access door and the second mounting crossbeam is provided with a locking mechanism for locking or unlocking the access door.

[0023] Optionally, the locking mechanism includes a latch which is movable between a first position and a second position and extends from the access door. The second mounting crossbeam is provided with a locking protrusion and an unlocking groove. The latch is engaged with the locking protrusion to lock and close the access door when the latch is moved to the first position, and the latch is engaged with the unlocking groove to unlock and open the access door when the latch is moved to the second position.

[0024] Optionally, an avoidance slot for passage of the wheel is formed between each of two sides of the end plate and a corresponding side plate, and at least one of the end plate and the side plate adjacent to the end plate is provided with a fender, which is located radially outside of the wheel and is gradually inclined in a direction close to the wheel from the bottom to the top.

[0025] Optionally, the mounting plate is assembled with the mounting crossbeam to form a ship-shaped structure with a flat surface in the middle and upwardly inclined surfaces at both ends in a traveling direction.

[0026] A bogie includes a framework body, wheels mounted on the framework body, an axle-mounted brake disc, and the cladding structure for a bogie as described in any one of the foregoing embodiments.

[0027] A rail vehicle includes the bogie described above.

[0028] During application of the cladding structure for a bogie according to the present embodiment, the mounting crossbeam and the mounting plates are firstly assembled together and the assembled cladding structure for a bogie is then mounted on the bogie; or the mounting crossbeam and the mounting plates are directly mounted on the bogie. By providing the at least one of the mounting plates with the accommodating portion for accommodating the axle-mounted brake disc, a large-sized axle-mounted brake disc may be accommodated in the accommodating portion, without influence of the large-sized axle-mounted brake disc on a mounting height of the mounting plate, so that the cladding structure for a bogie may be applicable to the bogie including the large-sized axle-mounted brake disc. The mounting crossbeam and the mounting plates are connected to the framework body and thus have less relative movement to the wheel during traveling. Thus, it facilitates the reduction of a gap between the wheel and the avoidance slot of the cladding plate, and further blocks the airflow from flowing into the bogie device through the avoidance slot to generate an aerodynamic resistance, so that most of the airflow flows along the bottom surface of the cladding structure for a bogie on the outer side of the cladding structure for a bogie. Compared with the airflow flowing directly through the complex components within the bogie, the aerodynamic resistance can be effectively reduced, thereby facilitating the reduction of energy consumption.BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG. 1 is a schematic view showing a cladding structure cladding the bottom portion of the bogie according to a first embodiment of the present application; FIG. 2 is another schematic view of FIG. 1; FIG. 3 is a schematic view showing the cladding structure in FIG. 1; FIG. 4 is another schematic view of FIG. 3; FIG. 5 is a schematic view showing a mounting arm in FIG. 1; FIG. 6 is a schematic view showing a support skeleton in FIG. 3; FIG. 7 is a structural schematic view showing a cladding structure for a bogie according to a second embodiment of the present application; FIG. 8 is an exploded schematic view showing the cladding structure for the bogie in FIG. 7; FIG. 9 is a schematic view showing an end plate and an access door to be mounted on a first mounting crossbeam; FIG. 10 is a schematic view showing the end plate mounted on the first mounting crossbeam; FIG. 11 is a schematic view showing the access door mounted on the second mounting crossbeam; FIG. 12 is a partially enlarged view of part A in FIG. 11; FIG. 13 is a structural schematic view showing the access door; FIG. 14 is a structural schematic view showing an embodiment of the bogie according to the present application; FIG. 15 is a bottom view showing the bogie in FIG. 14; FIG. 16 is a sectional schematic view showing a rail vehicle according to the present application; FIG. 17 is a structural schematic view showing the bogie according to the second embodiment of the present application after removing the end plates; FIG. 18 is a structural schematic view showing the bogie according to the second embodiment of the present application after removing the access door; FIG. 19 is a structural schematic view showing a connection between a second mounting crossbeam and an end plate of the bogie according to the second embodiment of the present application; FIG. 20 is a partial structural schematic view showing the cladding device for the bogie according to the second embodiment of the present application; FIG. 21 is a sectional schematic view taken along line B-B in FIG. 20; FIG. 22 is a sectional schematic view taken along line A-A in FIG. 20; FIG. 23 is a schematic view showing an installation position of a metal plate in the end plate; FIG. 24 is a structural schematic view showing a bogie assembly according to a third embodiment of the present application; FIG. 25 is a bottom view showing the bogie assembly in FIG. 24; FIG. 26 is a structural schematic view showing a bogie assembly according to a fourth embodiment of the present application; FIG. 27 is a structural schematic view showing a framework body with mounting arms and mounting seats mounted thereon; and FIG. 28 is a structural schematic view showing an embodiment of a split cladding plate. List of reference numerals in FIGS. 1 to 6:

[0030] 100. cladding structure; 1. base plate; 11. sunken portion; 12. side flange; 13. end flange; 14. guard plate; 1a. opening portion; 2. mounting arm; 21. first connecting seat; 22. second connecting seat; 221. connecting disk; 222. bolt; 3. sand spreading device; 4. support skeleton; 41. frame crossbeam; 42. frame longitudinal beam; 43. longitudinal beam; 44. end crossbeam; 45. supporting seat; 5. obstacle removal device; 200. bogie; 201. side sill; 22. brake disc; 23. wheel; 24. anti-yaw damper. List of reference numerals in FIGS. 7 to 23:

[0031] 1. framework body, 11. axle-mounted brake disc, 2. cladding device for a bogie, 21. first mounting crossbeam, 211. first recess, 212. second recess, 22. second mounting crossbeam, 221. locking protrusion, 222. unlocking groove, 23. end plate, 231. second protruding part, 232. end cambered surface, 233. reinforcing rib, 2331. foam core, 2332. carbon fiber layer, 234. metal mounting block, 235. metal plate, 236. , 24. side plate, 25. access door, 251. latch, 252. first protruding part, 253. rack, 254. locking rod, 26. accommodating portion, 27. avoidance slot, 28. fender, 3. Anti-roll torsion bar, 4. damper, 5. mounting arm, 6. mounting seat, 7. wheel, 8. connection bracket, 9. vehicle body, 101. gate plate, 102. clamp, 103. countersunk bolt, 104. Butterfly-shaped anti-loosening pad;List of reference numerals in FIGS. 24 to 28:

[0032] 1. framework body, 2. mounting arm, 21. adapter, 3. mounting seat, 4. cladding plate, 41. reinforcing rib, 42. avoidance slot, 43. flange, 44. end plate, 45. side plate, 46. access door, 47. mounting beam, 48. fender, 51. axle- mounted brake disc, 52. wheel- mounted brake disc, 521. brake caliper, 6. damper, 7. anti-roll torsion bar, 8. wheel, 9. suspension structure.DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] For those skilled in the art to better understand technical solutions of the present application, the present application will be further described in detail with reference to the drawings by means of embodiments hereinafter.

[0034] Referring to FIGS. 1 to 4, FIG. 1 is a schematic view showing a cladding structure 100 cladding a bottom portion of a bogie 200 according to a first embodiment of the present application; FIG. 2 is another schematic view of FIG. 1; FIG. 3 is a schematic view showing the cladding structure 100 in FIG. 1; and FIG. 4 is another schematic view of FIG. 3.

[0035] The cladding structure 100 according to the present embodiment is configured to clad the bottom portion of the bogie 200. The cladding structure 100 includes a base plate 1, which is a one-piece plate or is formed by connecting multiple plates. The base plate 1 shown in FIG. 2 includes multiple plates, which are connected together by bolts or welded to form an integrated plate. In addition, the base plate 1 is provided with an opening portion 1a. According to the present embodiment, the base plate 1 has two end portions defined as a front end portion and a rear end portion, and two sides defined as a left side and a right side. The directional terms "front, "rear", "left" and "right" may be understood with reference to the bogie 200. When the bogie 200 has been mounted on a rail vehicle, the front-rear direction of the bogie 200 is a lengthwise direction of the rail vehicle, and a left-right direction of the bogie 200 is a widthwise direction of the rail vehicle.

[0036] According to the present embodiment, each end portion of the base plate 1 is formed with the opening portion 1a. Specifically, each end portion is formed with the opening portion 1a on each of left and right sides thereof. The opening portion 1a is configured to avoid a wheel 23 of the rail vehicle, and there are four opening portions 1a for avoiding four wheels 23 disposed on the bogie 200. In this case, inner and outer sides of the wheel 23 are both cladded by the base plate 1. The term "inner" means an area between the left and right wheels 23, and the term "outer" means the other area. With such arrangement, the bottom portion of the bogie 200 is cladded entirely by the base plate 1. Here, the term "cladding" means that, when projected from top to bottom, a projection of the bottom portion of the bogie 200 is located within a projection of the base plate 1 on a projection plane. As can be seen from FIG. 1, the projection of most structures of the bogie 200 is located inside of the projection of the base plate 1 on a projection plane, except that an anti-yaw damper 24 disposed on either side of the bogie 200 extends laterally slightly beyond the base plate 1.

[0037] With such arrangement, the airflow, when flowing past the bottom portion of the bogie 200, will not flow through complex components within the bogie 200, but will flow away directly along a bottom surface of the base plate 1, thereby reducing an aerodynamic resistance to which the bogie 200 is subjected. In addition, the base plate 1 is provided with the opening portion 1a for avoiding the wheel 23. The opening portion 1a positioned for avoiding the wheel 23, occupies a small space due to the fact that the cladding structure 100 is secured to a framework, in particular a framework body, of the bogie 200 and thus has less relative movement to the wheel 23. As such, the influence of the resistance caused by the airflow flowing into the bogie 200 through the opening portion 1a can be small, without influencing the effect of the cladding structure 100 in reducing the running resistance. It may be noted that the opening portion 1a may be designed to have the dimensions as small as possible in both the front-rear direction and the left-right direction, as long as there is a sufficient gap maintained between the opening portion 1a and the wheel 23, i.e. it is sufficient to avoid the wheel 23 and not interfere with the running of the wheel 23. Thus, it can minimize the airflow flowing into the bogie 200 through the gap between the opening portion 1a and the wheel 23.

[0038] As shown in FIG. 3, the opening portion 1a described above is a notch provided at the end portion of the base plate 1. That is, all the opening portion 1a extend through the base plate 1 in an up-down direction, and the opening portion 1a located at a front end portion of the base plate 1 has an open front end, and the opening portion 1a located at a rear end portion of the base plate 1 has an open rear end. As can be seen from FIG. 2, the opening portion 1a is a substantially U-shaped notch, so as to facilitate the mounting of the wheel 23 and the manufacturing of the opening portion 1a in the base plate 1. It will be appreciated that the opening portion 1a is not limited to a notch, for example, a through-slot that passes through the base plate 1 only in the up-down direction is possible.

[0039] Furthermore, as shown in FIG. 3, a guard plate 14 extending upwardly is provided at an edge of the opening portion 1a of the base plate 1. The guard plate 14 surrounds the opening portion 1a so as to clad a part of the wheel 23. In this way, the guard plate 14 can partially prevent debris, rain, snow, mud, etc. on rails from going upwardly into the bogie 200 through the opening portion 1a during running. An extension of the guard plate 14 is not limited in size. As shown in FIGS. 2 and 3, the opening portion 1a in the form of the notch includes side edges and an end edge which are extended upwardly, and the end edge is oriented toward a wheel surface of the wheel 23. The guard plate 14 has a relatively large height at the end edge. Since the end edge is oriented toward the wheel surface and is more likely to confront with debris or the like due to running inertia, it may be heightened.

[0040] Further, in addition to the wheel 23, a bottom portion of the brake disc 22 is at a lower position. In this case, as shown in FIG. 2, the base plate 1 of the cladding structure 100 is provided with a sunken portion 11 for receiving the brake disc 22 of the bogie 200. When viewed from top to bottom, the sunken portion 11 is downwardly recessed, so as to form a concave cavity for receiving the brake disc 22. When viewed from bottom to top, the sunken portion 11 include a wall bulging downwardly with respect to the bottom surface of the base plate 1, and such bulging part results in increased airflow resistance compared with the whole flat bottom surface of the base plate 1. As a result, in the present embodiment, the sunken portion 11 includes an outer surface which is designed to be streamlined. Here, the outer surface of the sunken portion 11 is the bottom surface of the sunken portion 11, and an inner surface of the sunken portion 11 is a cavity wall of the concave cavity of the sunken portion 11 and is an upper surface of the sunken portion 11. By designing the outer surface of the sunken portion 11 to be streamlined, the increase in airflow resistance caused by the sunken portion 11 bulging relative to the bottom surface of base plate 1 can be mitigated. Additionally, the sunken portion 11 is equivalent to a reinforcing rib for base plate 1, which serves to improve the structural strength of the base plate 1.

[0041] With such arrangement, the base plate 1 of the cladding structure 100 may be located as close as possible to the bottom portion of the bogie 200, with almost no increase in the airflow resistance exerted on the bottom surface of the base plate 1. That is, the base plate 1 may be located at a high level as far away from the ground as possible, without being wholly lower than the brake disc 22, and without being too low to be limited by a lower limit boundary. In this case, both end portions of the base plate 1 may be located as close as possible to the bogie 200 as well, thereby reducing the airflow from the end portions into the bogie 200 to further reduce the airflow resistance.

[0042] A streamlined structure is of a structural shape where there is no significant separation of the airflow at a structural surface. When moving relative to the airflow, the streamlined structure is subjected to lower airflow resistance. In the present embodiment, the outer surface of the sunken portion 11 of the base plate 1 may be provided in a spindle shape as shown in FIGS. 1 and 3, which is narrow at both ends and wide in the middle, having a size increasing from the pointed ends toward the middle, and a curved surface smoothly extending to the middle. In this way, the airflow can flow rearwardly along the curved surface from the pointed end when flowing past the sunken portion 11, resulting in low airflow resistance. It may be noted that the streamlined structure is various, and is not limited to a spindle shape. For example, the streamlined structure may be in drop shape, having a single pointed end, which can achieve resistance reduction only during unidirectional movement.

[0043] Furthermore, according to the present embodiment, each of left and right edges of the base plate 1 extends upwardly to form a side flange 12, and / or, each of end edges of the base plate 1 extends upwardly to form an end flange 13. The side flange 12 of the base plate 1 may partially clad a side portion of the bogie 200, or at least cover a gap between the side portion of the bogie 200 and the side edge of the base plate 1, so as to prevent the airflow or other debris from flowing into the bogie 200. By providing the end flange 13 at the end portion, it is possible to prevent the airflow from flowing into the bogie 200 through the gap at the end portion. Also, as previously described, the base plate 1 may be located as close as possible to the bogie 200 due to the provision of the sunken portion 11 for receiving the brake disc 22, and thus the end flange 13 provided at the end portion may have a height designed to be smaller so as to reduce the resistance caused by the airflow when flowing to the end portion.

[0044] Referring to FIGS. 2 to 4, each end portion of the base plate 1 may be arcuate, which facilitates the reduction of the airflow resistance at the end portion and prevents the cladding structure 100 from interfering with other components when it swings and deflects together with bogie 200. As shown in FIG. 2, in the present embodiment, the base plate 1 includes end plate pieces and multiple middle plate pieces. Each of the end plate pieces is provided with an arcuate end portion and an opening portion 1a, forming a profiled structure. The middle plate pieces may be provided as a single rectangular plate piece or as three rectangular plate pieces arranged along the widthwise direction as shown in FIG. 2. When the length of the bogie 200 is changed, the end plate pieces at both end portions do not have to be structurally modified, and only the number of middle plate pieces need to be adjusted, thereby achieving modular assembly.

[0045] Reference is made to FIG. 5, which is a schematic view showing a mounting arm 2 in FIG. 1.

[0046] The cladding structure 100 according to the present embodiment further includes a mounting arm 2 which includes a first connecting seat 21 and a second connecting seat 22. The first connecting seat 21 of the mounting arm 2 is connected to an end portion of the base plate 1. As shown in FIG. 3, both end portions of the base plate 1 are each provided with two mounting arms 2 disposed on both sides of each end portion of the base plate 1 respectively. In the present embodiment, the first connecting seat 22 is specifically a U-shaped plate with an opening facing downwardly, and may be engaged with the guard plate 14 extending from the side edge of the opening portion 1a of the base plate 1 when mounted on the cladding structure 100. The guard plate 14 may be thickened at this location, and the first connecting seat 22 may be further secured at this location via fasteners such as bolts, or by welding.

[0047] The framework of the bogie 200 includes side sills 201 located on the left and right sides. An air spring is provided in the middle of the side sill 201, and a mounting hole for mounting a suspension is provided in each end portion of the side sill 201, generally, at the bottom of the end portion. According to the present embodiment, the second connecting seat 22 is connected to the end portion 2011 of the side sill 201 of the bogie 200. As shown in FIG. 5, an upper end of the second connecting seat 22 is provided with a connecting disk 221 facing the end portion 2011 of the side sill 201, and is provided with a connecting hole so as to be connected and secured to a connecting disk of the end portion 2011 of the side sill 201 by a connecting bolt 222. With such arrangement, the end portion 2011 of the side sill 201 is fully utilized to complete the connection of the bogie 200 and the cladding structure 100, allowing for easy installation and facilitating the assurance of the strength of the connection.

[0048] Furthermore, according to the present embodiment, a sand spreading device 3 and / or an obstacle removal device 5 is mounted on the mounting arm 2. By providing the mounting arm 2 at the opening portion 11a, the sand spreading device 3 mounted at the mounting arm 2 facilitates the spreading of sand on a rail surface. The obstacle removal device 5 may be an obstacle removal plate shown in FIG. 5. That is, the mounting arm 2 may provide mounting positions for both the obstacle removal device 5 and the sand spreading device 3, making the installation of the structure easier, and preventing interference of the cladding structure 100 with the installation of the sand spreading device 3 and the obstacle removal device 5.

[0049] Reference is made to FIG. 6, which is a schematic view showing a support skeleton 4 in FIG. 3.

[0050] The cladding structure 100 according to the present embodiment further includes a support skeleton 4, which is fixed to an upper surface of the base plate 1 and is used for connecting with the framework of the bogie 200. The support skeleton 4 may improve the strength of the base plate 1 on the one hand, and improve the reliability of the connection with the bogie 200 on the other hand. As shown in FIG. 6, the support skeleton 4 includes a central frame, which includes two frame crossbeams 42 and two frame longitudinal beams 41. Each of the frame longitudinal beams 41 on both sides of the central frame is connected to a curved beam 46, which is extended laterally and then upwardly to connect with the framework of the bogie 200. Each of the frame crossbeams 42 at both ends of the central frame is connected to an end crossbeam 44 via two longitudinal beams 43. The end crossbeam 44 is substantially arcuate so as to match in shape with a part of the end portion of the base plate 1 located between the two opening portions 11a. Each of the two longitudinal beams 43 is located between two sunken portions 11, and the two frame crossbeams 41 of the central frame are each provided with a supporting seat 45, which is extended upwardly to connect with the framework of the bogie 200. With such arrangement, the support skeleton 4 may better achieve the connection between the base plate 1 and the bogie 200, thereby improving the structural stability.

[0051] The base plate 1 of the cladding structure 100 according to the above embodiment may be made of a composite material, e.g., a carbon fiber composite material, a glass fiber reinforced plastic composite material, an aramid fiber composite material, or any combination of the above mentioned materials. This provides advantages such as high strength and light weight. When the base plate 1 is made of carbon fiber composite material, the mounting arm 2 and the support skeleton 4 as described above, and the multiple plates of the base plate 1 may be connected and fixed by fasteners such as bolts.

[0052] The present embodiment further provides a bogie assembly including a bogie 200 and a cladding structure 100 cladding the bottom portion of the bogie 200 as described in any of the above embodiments; the present embodiment further provides a rail vehicle including the bogie assembly described above. Both the bogie assembly and the rail vehicle achieve same technical effects as the above embodiments, which will not be repeated.

[0053] References are made to FIGS. 7 to 23, which show a cladding structure 2 of a bogie according to a second embodiment of the present application.

[0054] The present embodiment discloses a cladding structure 2 for a bogie, which may also be defined as a cladding device, for cladding the bottom portion of the bogie. The bogie is provided with a framework body 1 and an axle-mounted brake disc 11. The cladding structure 2 for a bogie includes a mounting crossbeam 2a for being fixedly connected to the framework body 1 of the bogie, and at least two mounting plates 2b fixedly disposed on the mounting crossbeam 2a. At least one of the mounting plates 2b is fixedly connected to the framework body 1 of the bogie. At least one of the mounting plates 2b is provided with an accommodating portion 26 for accommodating the axle-mounted brake disc 11. Similar to the sunken portion 11 in the first embodiment, a bottom portion of the accommodating portion 26 bulges from an outer surface of the mounting plate 2b.

[0055] During application of the cladding structure 2 for a bogie according to the present embodiment, the mounting crossbeam 2a and the mounting plates 2b are firstly assembled together and the assembled cladding structure 2 for a bogie is then mounted on the bogie; or the mounting crossbeam 2a and the mounting plates 2b are directly mounted to the bogie. By providing the at least one of the mounting plates 2b with the accommodating portion for accommodating the axle-mounted brake disc 11, a large-sized axle-mounted brake disc 11 may be accommodated in the accommodating portion 26, without influence of the large-sized axle-mounted brake disc 11 on a mounting height of the mounting plate, so that the cladding structure 2 for a bogie may be more applicable to the bogie including the large-sized axle-mounted brake disc 11. The mounting crossbeam 2a and the mounting plates 2b are connected to the framework body 1 and thus have less relative movement to the wheel 7 during traveling. Thus, it facilitates the reduction of a gap between the wheel 7 and an avoidance slot 27 (same as the opening portion 1a in the first embodiment) of the cladding structure 2, and further prevents the airflow from flowing into the bogie device through the avoidance slot 27 to generate an aerodynamic resistance, so that most of the airflow flows along the bottom surface of the cladding structure 2 for a bogie on the outer side of the cladding structure 2 for a bogie.

[0056] It is known that the bogie for rail vehicles is configured to carry a vehicle body and to realize functions of traveling and steering. The bogie is provided at the bottom of the vehicle body, and generally includes the framework body and components mounted on the framework body. The components are exposed externally, and due to the large size of the axle-mounted brake disc, it is difficult to clad the large-sized axle-mounted brake disc. As a result, during running of the rail vehicle, the components exposed externally are highly influenced by an aerodynamic resistance, which generates a large airflow resistance.

[0057] Compared with the airflow flowing directly through the complex components within the bogie, the aerodynamic resistance can be effectively reduced according to the present embodiment, thereby facilitating the reduction of energy consumption. In addition, with the arrangements of the mounting plate and the mounting crossbeam 2a, the mounting stress can be reduced.

[0058] In an embodiment shown in FIGS. 1, 3 and 9, similar to the first embodiment, the portion of the accommodating portion 26 bulging from the outer surface of the mounting plate 2b may be provided in a spindle shape. When the number of accommodating portion 26 is multiple, each of the multiple accommodating portions 26 may be provided in a spindle shape, and the accommodating portions 26 may be provided side-by-side, with the pointed end of the spindle shape being provided in a traveling direction of the bogie. It may be appreciated that an outer surface of the accommodating portion 26 bulging from the mounting plate 2b may be in another shape, which may be determined according to actual situation and will not be described herein.

[0059] In an embodiment shown in FIG. 8, the mounting crossbeam 2a includes a first mounting crossbeam 21 and a second mounting crossbeam 22 arranged in parallel, and each of the first mounting crossbeam 21 and the second mounting crossbeam 22 is arranged perpendicularly to the traveling direction of the bogie. The mounting plate 2b includes two side plates 24, two end plates 23, and an access door 25. The two side plates 24 are disposed at opposite ends in a lengthwise direction of the first mounting crossbeam 21 and the second mounting crossbeam 22 respectively. The two end plates 23 are disposed at a front end of the first mounting crossbeam 21 and a rear end of the second mounting crossbeam 22, respectively. The access door 25 is disposed between the front end of the first mounting crossbeam 21 and the second mounting crossbeam 22. The accommodating portion 26 is provided in the end plate 23.

[0060] During connection, a reinforcing rib 233 may be provided on an inner side of the mounting plate 2b. The reinforcing rib 233 may be filled with a foam core 2331 and provided with a carbon fiber layer 2332, as shown in FIG. 21. The reinforcing rib 233 may be provided in the form of a keel, which increases the cross-sectional area, improves the strength and modulus of each end plate 23, and meets design requirements. The foam core 2331 has a low density, which achieves the lightweight of the overall structure. The foam core 2331 is a porous structure, which is capable of absorbing sound and dissipating energy, and thus reduces the noise of the bogie region to a certain extent.

[0061] The side plate 24 may also be provided with the reinforcing rib 233 as shown in FIG. 21, depending on the actual situation, and it will not be described herein.

[0062] As shown in FIG. 22, a metal mounting block 234 is pre-embedded in a mounting part of the end plate 23 connected to the first mounting crossbeam 21 or the second mounting crossbeam 22, and in a mounting part of the access door 25 connected to the first mounting crossbeam 21 or the second mounting crossbeam 22, which can effectively alleviate the concentration of stress at threaded connections. Each of the mounting plate 2b and the mounting crossbeam 2a may be a composite part made of a composite material. In this way, it is possible to avoid the composite material from being directly pressed by threads and thus causing damage to it. The metal mounting block 234 is bonded to the composite parts by epoxy.

[0063] As shown in FIG. 23, the cladding structure 2 further includes a mounting arm 5 connected to the end plate 23. A metal plate 235 is pre-embedded in the part of the end plate 23 connected with the mounting arm 5. The metal plate 235 is provided with a fiber string exit hole 236. During the layering and molding of a carbon fiber feed, the carbon fiber filaments run out through the fiber stringing hole 236 and are extended to a surrounding carbon fiber cloth for further layering and resin injection molding. In this way, after the cladding structure 2 is installed, both the carbon fiber filaments and the metal plate 235 are stressed, which increases a stressed area, reduces a shear force of the resin connecting around the metal plate 235, thereby improving the strength of the connection.

[0064] Both ends of the first mounting crossbeam 21 and the second mounting crossbeam 22 are each connected to the side plate 24. As shown in FIG. 9, the end plate 23 on one side is provided with a second protruding part 231, and the first mounting crossbeam 21 is provided with a second recess 212 that matches with the second protruding part 231. The second protruding part 231 is inserted into the second recess 212 during assembling. As shown in FIG. 10, the end plate 23 on the other side is provided with a second protruding part 231, and the second mounting crossbeam 22 is provided with a second recess 212 that matches with the second protruding part 231 of the end plate 23 on the other side. The second protruding part 231 of the end plate 23 on the other side is inserted into the second recess 212 of the second mounting crossbeam 22 during assembling. As shown in Fig. 9, the access door 25 is provided with a first protruding part 252, and the first mounting crossbeam 21 is provided with a first recess 211 that matches with the first protruding part 252. The first protruding part 252 is inserted into the first recess 211 and is locked by a locking mechanism during the mounting of the access door 25. As shown in FIG. 12, the locking mechanism includes a latch 251, which is movable between a first position and a second position and is provided on the access door 25. The second mounting crossbeam 22 is provided with a locking protrusion 221 and an unlocking groove 222. The latch 251 is engaged with the locking protrusion 221 to lock the access door 25 when the latch 251 is moved to the first position, and the latch 251 is engaged with the unlocking groove 222 to unlock and open the access door 25 when the latch 251 is moved to the second position. As shown in FIG. 12, a rack 253 and a locking rod 254 may be provided. The locking rod 254 is configured to connect the rack 253 and the latch 251. The rack 253 drives the locking rod 254 to move, so that the latch 251 is driven to move between the first position and the second position. As shown in FIG. 12, the latch 251 is located in the first position, and the latch 251 cooperates with the locking protrusion 221, so that the access door 25 is locked and closed. The rack 253 may be driven to move by a gear, or in any other way, which will not be described herein.

[0065] Preferably, on the basis of the above embodiment, as shown in FIG. 19, a countersunk head bolt 103 and a butterfly-shaped anti-loosening pad 104 may also be provided for fastening, while the mortise and tenon structure is mainly used for preventing separation of the components. Each of the first mounting crossbeam 21, the second mounting crossbeam 22, the end plate 23, the side plate 24, and other mounting plates has a threaded hole pre-prepared with a flare hole during formation. Upon fastening of the countersunk head bolt 103, a bolt head of the countersunk head bolt 103 is flush with an outer surface of the connected component, so as to prevent the bolt head from being struck by foreign objects (such as gravel rolled up by wheels) when the vehicle is traveling, which otherwise could result in the failure of bolt connections and the damage to a cladding plate.

[0066] Toothed protrusions may be uniformly provided on the surface of the butterfly-shaped anti-loosening pad 104 in contact with the connected component. When the countersunk head bolt 103 is screwed into a surface of the connected component and tightened, friction may be enhanced, thereby preventing the occurrence of loosening.

[0067] In an embodiment, an avoidance slot 27 for passage of the wheel 7 is formed between each of two sides of the end plate 23 and a corresponding side plate 24, and at least one of the end plate 23 and the side plates 24 adjacent to the end plate 23 is provided with a fender 28, which is located radially outside of the wheel 7 and is gradually inclined in a direction close to the wheel 7 from the bottom to the top.

[0068] As shown in FIG. 8, a fender 28 is provided on each side of each end plate 23, and a fender 28 (same as the guard plate 14 in the first embodiment) is also provided on a side of each side plate 24 adjacent to the end plate 23. During assembly, the fender 28 provided on the end plate 23 is fixedly connected to the fender 28 provided on the side plate 24 so as to form an integrated fender 28. By gradually inclining the fender 28 in the direction close to the wheel 7 from the bottom to the top of the cladding structure 2 of the bogie, it is possible to effectively prevent the airflow from being drawn into the bogie during traveling, and to reduce the accumulation of dust and snow and ice on the bogie.

[0069] Preferably, a flange may be provided at an edge of each of the end plates 23 and the side plates 24. The flange is provided perpendicular to a bottom surface of the end plate 23 or the side plate 24.

[0070] As shown in FIG. 7, each of the first mounting crossbeam 21 and the second mounting crossbeam 22 is provided with a mounting seat 6, and each side plate 24 is provided with a connection bracket 8. When the cladding structure 2 for a bogie is connected to the framework body 1, the mounting seat 6 and the connection bracket 8 may be fixedly connected to the framework body 1.

[0071] In addition to the cladding structure 2 for a bogie mentioned above, the present application further provides a bogie including a framework body 1, wheels 7 mounted on the framework body 1, an axle-mounted brake disc 11, and the cladding structure 2 for a bogie disclosed in the above embodiments. The structure of other parts of the bogie will not be described herein, referring to the related art.

[0072] As shown in FIG. 14, an axle-mounted brake disc 11 is provided between two wheels 7 of the framework body 1, and a lower portion of the axle-mounted brake disc 11 is located in the accommodating portion 26 of the mounting plate 2b, so that the overall cladding plate may be advantageously disposed higher. The framework body 1 is provided with mounting arms 5 (same as the mounting arm 2 in the first embodiment) at both ends of the framework body 1 in a travelling direction. The mounting arm 5 is fixedly connected to the framework body 1 at one end, and is fixedly connected to the mounting plate at the other end. Preferably, the mounting arm 5 may be provided with a mounting interface for the mounting of a sand spreading device, an obstacle removal device, and other structures. As shown in FIG. 1, the framework body 1 is further provided with a damper 4 and an anti-roll torsion bar 3.

[0073] During application of the bogie according to the present embodiment, the various plates in the cladding structure 2 for a bogie may be removed separately to facilitate maintenance and replacement of parts. For example, as shown in FIG. 17, when there is a need to replace a gate plate 101 and a clamp 102 of the bogie, the end plates 23 at both ends may be disassembled; and when the bogie is visually inspected during maintenance, the access door 25 may be disassembled, as shown in FIG. 18. The access door 25 is of a quick-disassembling structure to meet operational requirements for rapid maintenance.

[0074] In addition to the bogie described above, the present application further provides a rail vehicle including a bogie. The structure of other parts of the rail vehicle will not be described herein, referring to the related art.

[0075] As shown in FIG. 16, the rail vehicle includes a vehicle body 9. When viewed from a side of the rail vehicle, the cladding structure 2 for a bogie is of a ship-shaped structure. The middle of the cladding structure 2 for a bogie in the traveling direction of the vehicle body 9 has flat surface except for the accommodating portion 26. Each of front and rear ends of the cladding structure 2 for a bogie is of an upwardly inclined structure. Each edge of the mounting plate 2b is provided with a flange with a certain height so as to effectively prevent the airflow from flowing into the bogie, thereby reducing the air resistance. Furthermore, an end cambered surface 232 may be provided at the upwardly inclined part at each of the front and rear ends of the cladding structure for a bogie 2. The end cambered surface 232 may be provided to balance the angle of the bogie rotated with respect to the vehicle body 9, so as to reduce the gap between the cladding structure 2 for a bogie and the vehicle body 9, and further reduce the airflow flowing into the bogie, thereby decreasing the air resistance.

[0076] The terms "first" and "second" in "the first recess 211 and the second recess 212", "the first protruding part 252 and the second protruding part 231", and "the first mounting crossbeam 21 and the second mounting crossbeam 22" mentioned in the present application are merely intended to distinguish between positions, and do not imply a sequence.References are made to FIGS. 24 to 28.

[0077] The present embodiment discloses a bogie assembly comprising a framework body 1, a cladding plate 4, mounting arms 2, and a mounting seat 3. The cladding plate 4 clads the bottom portion of the bogie assembly, has a flat bottom surface, and is provided with an avoidance slot 42 for passage of the wheel 8. The avoidance slot 42 is equivalent to the opening portion 1a in the first embodiment. The mounting arms 2 are provided at either end of the framework body 1 in the traveling direction of the vehicle. The mounting arms 2 are fixedly connected to the framework body 1 at one end, and are fixedly connected to the cladding plate 4 at the other end. The mounting seat 3 is provided in the middle of the framework body 1 in the traveling direction of the vehicle, and the cladding plate 4 is fixedly connected to the mounting seat 3.

[0078] It should be noted that the cladding plate 4 may be of a one-piece structure, or the cladding plate 4 may be provided in a split structure. The cladding plate 4 is provided with an access door 46 that can be easily opened and closed. The access door 46 may be rotationally provided on the cladding plate 4, or may be detachably connected to the cladding plate 4, depending on the actual situation, which will not be described herein.

[0079] The cladding plate 4 according to the present embodiment is configured to mainly clad the bottom portion of the bogie assembly, and all parts of the bogie assembly are cladded. An extension portion may be provided on either side of the cladding plate 4, and the extension portion may be used to clad a side portion of the bogie assembly, depending on the actual situation.

[0080] During use of the bogie assembly according to the present application, when the vehicle is moving, the airflow flows past the bogie assembly. The cladding plate 4 clads the bottom portion of the bogie assembly, and the cladding plate 4 is fixedly connected to the framework body 1 by the mounting arm 2 and the mounting seat 3 and thus has less relative movement to the wheel 8, which facilitates the reduction of a gap between the wheel 8 and the avoidance slot 42 of the cladding plate 4, and further blocks the airflow from flowing into the bogie assembly through the avoidance slot 42 to generate an aerodynamic resistance. Thus, most of the airflow flows along the bottom surface of the cladding plate 4 on the outer side of the cladding plate 4, which effectively reduces the aerodynamic resistance and facilitates reduction of energy consumption, compared with the airflow flowing directly through the complex components within the cladding plate 4.

[0081] As shown in FIG. 27, the number of mounting arms 2 is four, which are disposed at the ends of support beams, extending in the traveling direction, of the framework body 1. The mounting arm 2 is provided with at least one adapter 21, which may be configured to connect a sand spreading device, an obstacle removal device, and other structures, thereby facilitating the connection between the bogie assembly and other components.

[0082] In an embodiment, the framework body 1 is provided with an axle-mounted brake disc 51, which is completely located on the inside of the cladding plate 4. Due to the small size of the axle-mounted brake disc 51, the arrangement of the cladding plate 4 is not influenced. The cladding plate 4 may be provided to have a flat surface. The cladding plate 4 may be provided in a ship-shaped structure, having flat surface in the middle of the cladding plate 4 in the traveling direction of the vehicle and inclined surfaces symmetrically provided on two sides of the flat surface. It may be appreciated that the cladding plate 4 may also be provided in any other way, which will not be described herein. As in the first embodiment and the second embodiment, an axle-mounted brake disc is used. In the case that the gap between the cladding plate and the framework body is too small to influence the arrangement of the axle-mounted brake disc, a sunken portion 11 for avoidance is provided on the base plate 1 of the cladding structure 100 according to the first embodiment, and an accommodating portion 26 for avoidance is provided on the cladding device 2 for a bogie according to the second embodiment.

[0083] As shown in FIG. 24, an inner surface of the cladding plate 4 is provided with a reinforcing rib 41. The reinforcing rib 41 may extend in the traveling direction of the vehicle, or in any other direction, depending on the actual situation, which will not be described herein. By providing the reinforcing rib 41, it is possible to effectively improve the structural rigidity of the cladding plate 4. The axle-mounted brake disc 51 is mounted on a connecting axle connecting two wheels 8. The axle-mounted brake disc 51 in FIG. 24 has a small size that does not influence the installation of the cladding plate 4. Each of the two sides of the framework body 1 perpendicular to the traveling direction is provided with a damper 6, which may be an anti-yaw damper. In order to improve the stability of the traveling process, the framework body 1 is also provided with an anti-roll torsion bar 7. In FIG. 24, an edge of the cladding plate 4 is provided with a flange 43 that is perpendicular to the bottom surface of the cladding plate 4 and bent toward the framework body 1. By providing the flange 43, it is possible to improve the strength of the cladding plate 4, and block the airflow from flowing into the bogie assembly.

[0084] In an embodiment, the cladding plate 4 may be provided in a split structure. As shown in FIG. 29, the cladding plate 4 may be provided in a split structure including two end plates 44, two side plates 45, mounting beams 47, and an access door 46. During connection, the end plates 44, the side plates 45, and the access door 46 are mounted by means of two mounting beams 47. With the split arrangement, it is possible to reduce the processing difficulty of the cladding plate 4, and simplify the installation and disassembly of the cladding plate 4. The access door 46 may be rotatably provided on the mounting beam 47 by means of a hinge, or may be detachably connected to the mounting beam 47, depending on the actual situation, which will not be described herein.

[0085] The bottom surface of the cladding plate 4 may be provided as a flat surface, or the bottom surface of the cladding plate 4 may be provided as a combination of at least two of a flat surface, an inclined surface, or a cambered surface.

[0086] As shown in FIG. 29, a fender 48 is provided at the avoidance slot 42 of the cladding plate 4. The fender 48 is located radially outside of the wheel 8 and is gradually inclined in a direction close to the wheel 8 from the bottom to the top of the cladding plate 4, thereby blocking the airflow during traveling, and reducing the accumulation of dust and snow and ice on the bogie assembly.

[0087] In an embodiment shown in FIG. 26, the framework body 1 is provided with a wheel-mounted brake disc 52, which extends at least partially through the avoidance slot 42. The framework body 1 is provided with a suspension structure 9 and a brake caliper 521. The wheel-mounted brake disc 52 is mounted on the wheel 8, and effectively improves braking effect. The cladding plate 4 is disposed at the bottom portion of the framework body 1, and the cladding plate 4 according to the present embodiment is the cladding plate 4 described in the above embodiments.

[0088] As shown in FIG. 27, the framework body 1 is provided with multiple mounting seats 3. The mounting seat 3 has one end fixedly connected to the framework body 1, and the other end fixedly connected to the cladding plate 4. The mounting seat 3 may be fixedly connected to the cladding plate 4 by means of a connector. In FIG. 27, the number of mounting seats 3 is eight, and the eight mounting seats 3 are symmetrically disposed with respect to the middle cross-section of the framework body 1. Depending on the actual situation, the number of mounting seats 3 may vary, and the mounting seats 3 may be located in any other way.

[0089] In addition to the above bogie assembly, the present application further provides a rail vehicle including the bogie assembly disclosed in the above embodiments. The structure of other parts of the rail vehicle will not be described herein, referring to the related art.

[0090] The principle and implementation of the present application are illustrated by using specific embodiments herein. The above descriptions of the embodiments are only intended to facilitate understanding of the method and the core idea of the present application. It should be noted that, several improvements and modifications may be made by those skilled in the art to the present application without departing from the principle of the present disclosure, and these improvements and modifications also fall within the protection scope of the claims of the present disclosure.

Claims

1. A cladding structure for a bogie, wherein the cladding structure comprises a base plate configured to clad a bottom portion of the bogie, and the base plate is provided with opening portions for avoiding wheels of a rail vehicle respectively.

2. The cladding structure for the bogie according to claim 1, wherein each opening portion is a notch formed in an end portion of the base plate; and / or a guard plate extending upwardly is provided at an edge of each opening portion.

3. The cladding structure for the bogie according to claim 1, wherein the base plate is provided with a sunken portion for receiving a brake disc of the bogie, and the sunken portion comprises a wall bulging downwardly with respect to a bottom surface of the base plate, and an outer surface which is streamlined; or the avoidance slot is configured to allow passage of at least part of a wheel-mounted brake disc of the bogie.

4. The cladding structure for the bogie according to claim 3, wherein the outer surface of the sunken portion is in a spindle shape or a drop shape.

5. The cladding structure for the bogie according to claim 1, wherein each of two side edges of the base plate extends upwardly to form a side flange, and / or, each of end edges of the base plate extends upwardly to form an end flange.

6. The cladding structure for the bogie according to any one of claims 1 to 5, further comprising a mounting arm which comprises a first connecting seat and a second connecting seat, wherein the first connecting seat is connected to the base plate, and the second connecting seat is connected to an end portion of a side sill of the bogie.

7. The cladding structure for the bogie according to claim 6, wherein a sand spreading device and / or an obstacle removal device is mounted on the mounting arm.

8. The cladding structure for the bogie according to claim 7, wherein the mounting arm is disposed at the opening portion, a side edge of the opening portion is provided with a side flange extending upwardly, and the first connecting seat comprises a U-shaped plate which is engaged with and fixed to the side flange.

9. The cladding structure for the bogie according to any one of claims 1 to 5, wherein the cladding structure further comprises a support skeleton, which is fixed to the base plate and configured to be connected with a framework of the bogie.

10. A cladding structure for a bogie, wherein the cladding structure is configured to clad a bottom portion of the bogie, the bogie is provided with a framework body (1) and an axle-mounted brake disc (11), and the cladding structure (2) for the bogie comprises: a mounting crossbeam (2a) for fixedly connecting to the framework body (1) of the bogie; and at least two mounting plates (2b) fixedly disposed on the mounting crossbeam (2a), wherein at least one of the mounting plates (2b) is configured to be fixedly connected to the framework body (1) of the bogie, at least one of the mounting plates (2b) is provided with an accommodating portion (26) for accommodating the axle-mounted brake disc (11), and a bottom portion of the accommodating portion (26) bulges from an outer surface of the mounting plate (2b).

11. The cladding structure for the bogie according to claim 10, wherein the portion of the accommodating portion (26) bulging from the outer surface of the mounting plate (2b) is in a spindle shape.

12. The cladding structure for the bogie according to claim 10, wherein each of the mounting plates (2b) is detachably mounted on the mounting crossbeam (2a) by a mortise and tenon structure.

13. The cladding structure for the bogie according to claim 12, wherein the mounting crossbeam (2a) comprises a first mounting crossbeam (21) and a second mounting crossbeam (22) arranged in parallel, each of the first mounting crossbeam (21) and the second mounting crossbeam (22) is arranged perpendicular to a traveling direction of the bogie; the mounting plate (2b) comprises two side plates (24), two end plates (23) and an access door (25), the two side plates (24) are disposed at opposite ends in a lengthwise direction of the first mounting crossbeam (21) and the second mounting crossbeam (22) respectively, the two end plates (23) are disposed at a front end of the first mounting crossbeam (21) and a rear end of the second mounting crossbeam (22) respectively, and the access door (25) is disposed between the front end of the first mounting crossbeam (21) and the second mounting crossbeam (22); and the accommodating portion (26) is provided on each end plate (23).

14. The cladding structure for the bogie according to claim 13, wherein one of the access door (25) and the first mounting crossbeam (21) is provided with a first protruding part (252), and the other of the access door (25) and the first mounting crossbeam (21) is provided with a first recess (211) that matches with the first protruding part (252), and the first protruding part (252) is inserted in the first recess (211); and at least one of the access door (25) and the second mounting crossbeam (22) is provided with a locking mechanism for locking or unlocking the access door (25).

15. The cladding structure for the bogie according to claim 14, wherein the locking mechanism comprises a latch (251) which is movable between a first position and a second position and extends from the access door (25); and the second mounting crossbeam (22) is provided with a locking protrusion (221) and an unlocking groove (222), the latch (251) is configured to be engaged with the locking protrusion (221) to lock and close the access door (25) when the latch (251) is moved to the first position, and to be engaged with the unlocking groove (222) to unlock and open the access door (25) when the latch (251) is moved to the second position.

16. The cladding structure for the bogie according to any one of claims 13 to 15, wherein an avoidance slot (27) for passage of a wheel (7) is formed between each of two sides of each end plate (23) and the corresponding side plate (24), and at least one of the end plate (23) and each side plate (24) adjacent to the end plate (23) is provided with a fender (28), which is located radially outside of the wheel (7) and is gradually inclined in a direction close to the wheel (7) from the bottom to the top.

17. The cladding structure for the bogie according to any one of claims 10 to 15, wherein the mounting plate (2b) is assembled with the mounting crossbeam (2a) to form a ship-shaped structure with a flat surface in the middle and upwardly inclined surfaces at both ends in a traveling direction.

18. A bogie assembly comprising a bogie, and the cladding structure for the bogie according to any one of claims 1 to 17, wherein the cladding structure clads a bottom portion of the bogie.

19. A bogie assembly comprising: a bogie; the cladding structure for the bogie according to any one of claims 1 to 9, wherein the cladding structure clads a bottom portion of the bogie; and a mounting seat (3) provided in the middle of a framework body (1) in a traveling direction of the vehicle, wherein the cladding plate (4) is fixedly connected to the mounting seat (3).

20. The bogie assembly according to claim 19, wherein a bottom surface of the cladding plate is a flat surface.

21. The bogie assembly according to claim 19, wherein an inner surface of the cladding plate facing the framework body of the bogie is provided with a reinforcing rib.

22. The bogie assembly according to claim 21, wherein a bottom surface of the cladding plate (4) is a flat surface; or a bottom surface of the cladding plate (4) is a combination of at least two of a flat surface, an inclined surface, and a cambered surface.

23. A rail vehicle comprising the bogie assembly according to any one of claims 18 to 22.

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