Vehicle underframe and railway vehicle

Abstract

The utility model discloses a vehicle underframe and a railway vehicle, and relates to the technical field of vehicle engineering. The vehicle underframe comprises an edge beam, a second side plate of the edge beam inclines relative to the vertical direction and gradually deviates to a first side plate of the edge beam in the downward direction, a mounting channel is formed in the edge beam, and the part, located around the mounting channel, of a top plate forms a supporting table; a mounting seat is arranged at the end part of the bracket and can move upwards to the upper part of the top plate through the lower part of the mounting channel; the supporting plate can extend into the position between the bracket and the top plate in the longitudinal direction and block the mounting channel, the supporting plate is supported and fixed to the lower portion of the bracket, and at least part of the structure of the supporting plate presses and is fixedly connected to the supporting table. When the bracket used for installing the under-vehicle part is assembled, the bracket can be directly lifted from bottom to top through the installation channel, the installation base is made to be higher than the top plate of the bracket by a certain height, then the supporting plate longitudinally stretches into the position between the installation base and the top plate of the edge beam and blocks the installation channel, the longitudinal lifting stroke of the bracket in the assembling process can be reduced, and the assembling efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle engineering technology, and in particular to a vehicle chassis and rail vehicle. Background Technology

[0002] In railcar models based on side-beam suspension, undercarriage components are typically integrated onto brackets and installed in modular form. The side beams of the car body serve as load-bearing modules and are longitudinally continuous. A common installation method involves lifting the bracket above the side beam, moving it horizontally along the longitudinal direction, and then lowering it to the corresponding position on the side beam for connection. However, because the bracket requires long-distance horizontal movement during assembly, this increases assembly difficulty and reduces efficiency.

[0003] Therefore, how to improve the assembly efficiency of the bracket is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a chassis and rail vehicle that can improve the assembly efficiency of the bracket.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A vehicle chassis includes: a side beam, which is a box beam extending longitudinally, the side beam including a top plate, a bottom plate, a first side plate, and a second side plate, the bottom plate being disposed below the top plate, the first side plate and the second side plate being connected between the top plate and the bottom plate, the first side plate and the second side plate being arranged sequentially in the transverse direction, the second side plate being inclined relative to the vertical direction and gradually biased towards the first side plate in the downward direction, the side beam having an installation channel that passes through the top plate, the second side plate, and the bottom plate, the portion of the top plate surrounding the installation channel forming a support platform; a bracket extending laterally, the end of the bracket having a mounting seat, the mounting seat being movable upwards from below the installation channel to above the top plate; and a support plate extending longitudinally between the support plate and the top plate and blocking the installation channel, the support plate being supported and fixed below the bracket, at least a portion of the structure of the support plate pressing against and being fixedly connected to the support platform.

[0007] Preferably, a clearance hole is provided through the portion of the side beam located below the support platform; the first fastening assembly can be fixedly connected to the tray and the support platform through the clearance hole.

[0008] Preferably, the first fastening assembly includes a first nut and a first bolt, a first anti-rotation groove is formed on the support plate, and a first anti-rotation surface is provided on the first anti-rotation groove; the head end of the first bolt is placed behind the first anti-rotation groove and can fit against the first anti-rotation surface to prevent the first bolt from rotating; the first nut is connected to the screw of the first bolt through the clearance hole.

[0009] Preferably, the bracket further includes a main frame; the mounting base includes a pressure plate and a vertical plate fixed below one end of the pressure plate in the horizontal direction, the pressure plate and the main frame are located on both sides of the vertical plate in the horizontal direction, and the pressure plate is fixed above the bracket.

[0010] Preferably, the mounting base further includes a support plate fixed to the bottom end of the upright plate, the support plate and the pressure plate being located on both sides of the upright plate in the horizontal direction, and the support plate supporting and fixing the main frame below.

[0011] Preferably, the mounting base further includes reinforcing ribs, the reinforcing ribs including a first reinforcing plate fixed to the pressure plate and the upright plate.

[0012] Preferably, the reinforcing rib further includes a second reinforcing plate fixed to the main frame and the upright plate.

[0013] Preferably, it further includes a second fastening assembly, which includes a second nut and a second bolt. A second anti-rotation groove is provided on the pressure plate, and a second anti-rotation surface is provided on the second anti-rotation groove. The head end of the second bolt is placed behind the second anti-rotation groove and can fit against the second anti-rotation surface to prevent the second bolt from rotating. The second nut is connected to the screw of the second bolt through an installation channel.

[0014] Preferably, the side beam is a one-piece molded structure.

[0015] A rail vehicle, including, for example, an upper chassis.

[0016] The vehicle chassis provided by this utility model includes: a side beam, which is a box beam extending longitudinally, the side beam including a top plate, a bottom plate, a first side plate and a second side plate, the bottom plate being located below the top plate, the first side plate and the second side plate being connected between the top plate and the bottom plate, the first side plate and the second side plate being arranged sequentially in the transverse direction, the second side plate being inclined relative to the vertical direction and gradually biased towards the first side plate in the downward direction, an installation channel being provided on the side beam, and the installation channel passing through the top plate, the second side plate and the bottom plate, the portion of the top plate surrounding the installation channel forming a support platform; a bracket extending laterally, the end of the bracket having a mounting seat, the mounting seat being movable upwards from below the installation channel to above the top plate; a support plate, the support plate being able to extend longitudinally between the support plate and the top plate and block the installation channel, the support plate being supported and fixed below the support plate, at least a portion of the structure of the support plate pressing against and being fixedly connected to the support platform.

[0017] This type of chassis allows for direct lifting of brackets used to mount undercarriage components. The brackets are raised from bottom to top via the mounting channel, ensuring the mounting base is a certain height above the bracket's top plate. Then, a support plate is inserted longitudinally between the mounting base and the top plate of the side beam, blocking the mounting channel. The bracket is then lowered onto the support plate, and the support plate is secured to the side beam and the bracket, completing the assembly. This reduces the longitudinal lifting travel of the bracket during assembly, improving efficiency. Furthermore, the box-type side beams compensate for the impact of the mounting channel on their support capacity. While ensuring structural stability, the inclined second side plate provides a larger lateral area for the top plate, increasing the area that can support the bracket and improving its installation stability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 A cross-sectional view of the vehicle chassis provided by this utility model during the assembly process;

[0020] Figure 2 A partial bottom structural diagram of a specific embodiment of the vehicle chassis provided by this utility model;

[0021] Figure 3 This is a first partial exploded view of a specific embodiment of the vehicle chassis provided by this utility model;

[0022] Figure 4 This is a second partial exploded view of a specific embodiment of the vehicle chassis provided by this utility model;

[0023] Figure 5 This is a transverse schematic diagram of a specific embodiment of the vehicle chassis provided by this utility model;

[0024] Figure 6 This is an assembly drawing of the support plate and the first bolt in a specific embodiment of the vehicle chassis provided by this utility model;

[0025] Figure 7 This is an assembly diagram of the bracket and the second bolt in a specific embodiment of the vehicle chassis provided by this utility model.

[0026] Figure label:

[0027] Side beam 1, installation channel 11, top plate 12, support platform 121, first through hole 122, bottom plate 13, third through hole 131, first side plate 14, second side plate 15, second through hole 151, clearance hole 16.

[0028] Bracket 2, mounting base 21, pressure plate 211, upright plate 212, support plate 213, main frame 22, reinforcing rib 23, first reinforcing plate 231, second reinforcing plate 232, second anti-rotation groove 24, second anti-rotation surface 241;

[0029] Support plate 3, first anti-rotation groove 31, first anti-rotation surface 311,

[0030] First nut 51, first bolt 52, first washer 53;

[0031] Second nut 61, second bolt 62, second washer 63;

[0032] Horizontal (X), Vertical (Y). Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] The core of this utility model is to provide a chassis and rail vehicle that can improve the assembly efficiency of the bracket.

[0035] For a specific embodiment of the vehicle chassis provided by this utility model, please refer to [link / reference]. Figures 1 to 7 It includes side beam 1, bracket 2 and support plate 3.

[0036] Side beam 1 is a box girder extending along the longitudinal direction Y. For example... Figure 4 As shown, the side beam 1 includes a top plate 12, a bottom plate 13, a first side plate 14, and a second side plate 15 extending longitudinally. The top plate 12, the first side plate 14, the bottom plate 13, and the second side plate 15 are connected in sequence to form a cavity extending longitudinally Y in the box beam.

[0037] like Figure 1As shown, the bottom plate 13 is located below the top plate 12, and the first side plate 14 and the second side plate 15 are connected between the top plate 12 and the bottom plate 13. The first side plate 14 and the second side plate 15 are arranged sequentially along the transverse direction X. The chassis has two side beams 1 arranged sequentially along the transverse direction X. The second side plates 15 of the two side beams 1 are plates that are close to each other in the transverse direction, specifically symmetrically arranged. In the side beams 1, the second side plate 15 is inclined relative to the vertical direction and gradually deviates towards the first side plate 14 in the downward direction. At this time, as... Figure 1 As shown, the cross section of the side beam 1 perpendicular to the longitudinal direction Y is trapezoidal, and an inverted trapezoidal structural cavity is formed inside the side beam 1.

[0038] like Figure 4 As shown, the top surface of the top plate 12 serves as the bearing surface for the bracket 2 and the support plate 3, specifically a horizontal surface. An installation channel 11 is provided on the side beam 1, extending through the top plate 12, the second side plate 15, and the bottom plate 13. Specifically, the top plate 12 has a first through hole 122 extending vertically, the second side plate 15 has a second through hole 151 extending horizontally (X), and the bottom plate 13 has a third through hole 131 extending vertically. The first through hole 122, the second through hole 151, and the third through hole 131 are interconnected and located on the installation channel 11. Furthermore, the portion of the top plate 12 of the top plate 12, the second side plate 15, and the bottom plate 13 surrounding the installation channel 11 constitutes a support platform 121, used to fit and support the support plate 3.

[0039] like Figure 1 As shown, bracket 2 is used to install or integrate under-vehicle components, such as equipment boxes. Bracket 2 extends along the transverse X direction. It should be noted that transverse X and longitudinal Y are two different directions. Longitudinal Y is usually the direction of vehicle travel, while transverse X is the direction of vehicle width, which can be perpendicular to longitudinal Y. In addition, transverse X, longitudinal Y, and vertical directions can be perpendicular to each other.

[0040] like Figure 1 As shown, the bracket 2 has a mounting base 21 at its end, and the mounting channel 11 provides movement space. The mounting base 21 can be moved upwards from below the mounting channel 11 to above the side beam 1. Specifically, the longitudinal Y length of the mounting channel 11 is not less than the longitudinal Y length of the mounting base 21, so as to ensure that the mounting base 21 can pass through the mounting channel 11 from bottom to top without the bracket 2 needing to move laterally X or longitudinally Y. Specifically, two side beams 1 are arranged in the transverse X direction, and the bracket 2 has mounting bases 21 at both ends in the transverse X direction to be respectively connected to the two side beams 1.

[0041] like Figure 3As shown, the support plate 3 can extend longitudinally Y between the bracket 2 and the side beam 1 and block the installation channel 11 to disconnect the passage between the mounting base 21 and the installation channel 11, preventing the mounting base 21 from moving downward through the installation channel 11. The support plate 3 supports and is fixed below the bracket 2, and at least a portion of the structure of the support plate 3 presses on the support platform 121 and is fixedly connected to the support platform 121, thereby achieving the connection between the bracket 2 and the side beam 1.

[0042] When assembling the bracket 2 for mounting undercarriage components in this type of chassis, such as Figure 1 As shown, the bracket 2 can be lifted directly from bottom to top through the installation channel 11, making the mounting base 21 higher than the top plate 12 of the bracket 2 by a certain height. Then, the support plate 3 is extended longitudinally (Y) between the mounting base 21 and the top plate 12 of the side beam 1, blocking the installation channel 11. The bracket 2 is then lowered onto the support plate 3, and the support plate 3 is fixed to the side beam 1 and the bracket 2 respectively, thus completing the assembly. This reduces the lifting stroke of the bracket 2 along the longitudinal (Y) direction during assembly, improving assembly efficiency. In addition, the side beam 1 is a box beam, which can compensate for the impact of the installation channel 11 on the support capacity of the side beam 1. While ensuring structural stability, since the second side plate 15 is an inclined plate, the top plate 12 has a larger area in the transverse (X) direction, which can increase the area supporting the bracket 2 and improve the stability of the bracket 2 installation.

[0043] Furthermore, such as Figure 2 and Figure 4 As shown, a clearance hole 16 is provided through the portion of the side beam 1 located below the support platform 121. Specifically, the clearance hole 16 penetrates the second side plate 15 and the bottom plate 13. The first fastening assembly can be fixedly connected to the support plate 3 and the support platform 121 via the clearance hole 16. By adding the clearance hole 16, the fixation of the support plate 3 and the side beam 1 can be facilitated, and the first fastening assembly can achieve a detachable connection between the support plate and the side beam. Furthermore, the provision of the clearance hole 16 and the installation channel 11 effectively reduces the structural weight and achieves lightweighting. Of course, in other embodiments, the support plate 3 can also be welded to the support platform 121.

[0044] Among them, such as Figure 4 and Figure 6 As shown, the first fastening assembly includes a first nut 51 and a first bolt 52. A first anti-rotation groove 31 is formed on the support plate 3, and a first anti-rotation surface 311 is provided on the first anti-rotation groove 31. The head end of the first bolt 52 is placed in the first anti-rotation groove 31 and can fit snugly against the first anti-rotation surface 311 to prevent the first bolt 52 from rotating. The head end of the first bolt 52 has a polygonal structure. The first nut 51 is connected to the threaded part of the first bolt 52 through a clearance hole.

[0045] During assembly, the head of the first bolt 52 can be directly inserted into the first anti-rotation groove 31, so that the head of the first bolt 52 fits against the first anti-rotation surface 311. The first bolt 52 will then not rotate relative to the support plate 3. The first nut 51 can then be installed directly through the clearance hole 16 to achieve thread locking with the bolt 52. This operation is convenient, reduces the need for manual rotation control of the first bolt 52, and avoids the problem of the head of the first bolt 52 rotating when applying torque in confined spaces, where a wrench cannot operate. Additionally, a first washer 53 can be placed between the bottom surface of the top plate 12 and the first nut 51.

[0046] The first anti-rotation surface 311 can be provided in one or more forms, such as... Figure 6 Two are set in the middle to fit and cooperate with different sides of the head end of the first bolt 52 to achieve rotation limitation.

[0047] Furthermore, in bracket 2, such as Figure 1 and Figure 2 As shown, the bracket 2 also includes a main frame 22, through which under-vehicle components, such as equipment boxes, are fixedly connected. The mounting base 21 includes a pressure plate 211 and a vertical plate 212 fixed below one end of the pressure plate 211 in the transverse X direction. The pressure plate 211 and the main frame 22 are located on both sides of the vertical plate 212 in the transverse X direction. The pressure plate 211 is fixed above the support plate 3. At this time, it is fixed to the support plate 3 by pressing down with the pressure plate 211. The vertical plate 212 can adapt to and adjust the installation height requirements of the main frame 22. Moreover, the bracket 2 has a simple structure and is easy to process.

[0048] To ensure support capacity, in the horizontal direction X, the length of the support plate 3 is not less than the length of the top plate 12, and they can be the same; the length of the pressure plate 211 is not less than the length of the support plate 3, and they can be the same, thereby ensuring the support area.

[0049] Among them, such as Figure 1 and Figure 2 As shown, the mounting base 21 also includes a support plate 213 fixed to the bottom end of the upright plate 212. The support plate 213 and the pressure plate 211 are located on both sides of the upright plate 212 in the transverse direction X. The support plate 213 supports and fixes the main frame 22 below, thereby improving the connection strength between the mounting base 21 and the main frame 22. Specifically, the upright plate 212 and / or the support plate 213 can be welded or screwed to the main frame 22.

[0050] Among them, to further improve structural strength, such as Figure 1 and Figure 3As shown, the mounting base 21 also includes reinforcing ribs 23. The reinforcing ribs 23 include a first reinforcing plate 231 fixed to the pressure plate 211 and the upright plate 212 and a second reinforcing plate 232 fixed to the main frame 22 and the upright plate 212. The pressure plate 211 and the upright plate 212 form an inverted L-shaped structure, and the mounting base 21 forms a Z-shaped structure, which can respectively improve the structural strength inside the mounting base 21 and between the mounting base 21 and the main frame 22.

[0051] Alternatively, the reinforcing rib 23 can be a one-piece molded structure, or the first reinforcing plate 231 and the second reinforcing plate 232 can be two different plates. The reinforcing rib 23 is preferably welded and fixed to the mounting base 21 and the main frame 22.

[0052] Furthermore, depending on space and strength requirements, one or more stiffeners 23 may be provided, such as... Figure 3 As shown, the main frame 22 and a mounting base 21 can be connected to two reinforcing ribs 23 in the longitudinal Y direction.

[0053] Furthermore, to facilitate the fixing of the pressure plate 211 and the support plate 3, the chassis also includes a second fastening assembly to achieve a detachable connection between the pressure plate 211 and the support plate 3.

[0054] like Figure 2 and Figure 3 As shown, the second fastening assembly includes a second nut 61 and a second bolt 62. A second anti-rotation groove 24 is formed on the pressure plate 211, and a second anti-rotation surface 241 is provided on the second anti-rotation groove 24. The head end of the second bolt 62 is positioned in the second anti-rotation groove 24 and can engage with the second anti-rotation surface 241 to prevent the second bolt 62 from rotating. The head end of the second bolt 62 has a polygonal structure. The second nut 61 is connected to the threaded rod of the second bolt 62 via the mounting channel 11.

[0055] During assembly, the head of the second bolt 62 is directly placed into the second anti-rotation groove 24, so that it mates with the second anti-rotation surface 241. The second bolt 62 will then not rotate relative to the support plate 3. The second nut 61 can then be installed directly through the clearance hole 16 to achieve thread locking with the bolt 62. This method is convenient and reduces the need for manual rotation control of the second bolt 62, avoiding the problem of the head of the second bolt 62 rotating when applying torque in confined spaces where a wrench cannot operate. Additionally, a second washer 63 can be placed between the bottom surface of the top plate 12 and the second nut 61.

[0056] One or more second anti-rotation surfaces 241 can be provided, such as... Figure 7 Two are provided in the middle, so as to fit and cooperate with different sides of the head end of the second bolt 62 respectively, so as to achieve rotation limitation.

[0057] Furthermore, the side beam 1 is an integrally formed structure. The side beam 1 is set as an inverted trapezoidal integrally formed load-bearing profile structure, which simplifies the manufacturing process and avoids the use of conventional welding structure for the side beam 1, reducing the amount of processing. During processing, a process groove can be directly opened on the side beam 1 opposite the lifting position of the bracket 2 as an installation channel 11, and a process groove can be opened to form a clearance hole 16, which is convenient for processing.

[0058] In this embodiment, the chassis assembly process includes: opening clearance holes 16 and mounting channels 11 on the side beam 1; firstly, lifting the bracket 2 directly through the mounting channel 11 to the top surface of the top plate 12 without the bracket 2 needing to move laterally or longitudinally; then horizontally inserting the support plate 3 between the bracket 2 and the top surface of the side beam 1 along the longitudinal Y direction; and using fasteners to connect and secure the bracket 2 to the support plate 3 and the support plate 3 to the side beam 1, thereby solving the problem that the mounting base 21 cannot be directly lifted from bottom to top to the top plate 12, improving assembly efficiency and reducing assembly difficulty.

[0059] In this embodiment, the chassis uses two side beams 1 and a support plate 3 to support the bracket 2. The undercarriage components are assembled through the bracket 2 to realize the corresponding braking, operation, display, and air supply functions of the undercarriage components. In the undercarriage components, a central longitudinal Y-shaped pipe can be flexibly connected to the equipment box, forming a convenient, efficient, safe, and reliable installation scheme for the undercarriage components. The chassis has the following advantages: the mounting base 21 can be directly and vertically lifted above the bearing surface of the side beam 1 for connection and fastening without the need to adjust the position of the mounting base 21 in the lateral X or longitudinal Y direction; under the premise that the side beam 1 meets the bearing capacity requirements, the clearance hole 16 and the installation channel 11 effectively meet the construction space requirements for applying torque to the fasteners; the first anti-rotation groove 31 and the second anti-rotation groove 24 can effectively prevent the bolt head from rotating when applying torque, making the application of torque simple and eliminating the need for an additional wrench for anti-rotation.

[0060] In addition to the aforementioned chassis, this utility model also provides a rail vehicle, which includes a chassis. Specifically, the chassis can be the chassis provided in any of the above embodiments, and the beneficial effects can be referred to the respective embodiments above. The structure of other parts of this rail vehicle is described in the prior art and will not be repeated here.

[0061] It should be noted that when an element is referred to as "fixing" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as "connecting" another element, it can be directly connected to the other element or there may be an intervening element. Furthermore, in the description of this utility model, unless otherwise stated, "multiple," "multiple roots," and "multiple groups" mean two or more.

[0062] The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0064] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0065] The chassis and rail vehicle provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A vehicle chassis, characterized in that, include: Side beam (1), which is a box beam extending longitudinally (Y), the side beam (1) includes a top plate (12), a bottom plate (13), a first side plate (14) and a second side plate (15). The bottom plate (13) is located below the top plate (12). The first side plate (14) and the second side plate (15) are connected between the top plate (12) and the bottom plate (13). The first side plate (14) and the second side plate (15) are arranged sequentially in the transverse direction (X). The second side plate (15) is inclined relative to the vertical direction and gradually deviates towards the first side plate (14) in the downward direction. An installation channel (11) is provided on the side beam (1), and the installation channel (11) passes through the top plate (12), the second side plate (15) and the bottom plate (13). The part of the top plate (12) located around the installation channel (11) constitutes a support platform (121). A bracket (2) extends laterally (X) and has a mounting base (21) at one end, which can be moved up above the top plate (12) via the mounting channel (11); The tray (3) can extend longitudinally (Y) between the bracket (2) and the top plate (12) and block the installation channel (11). The tray (3) supports and is fixed below the bracket (2). At least part of the structure of the tray (3) presses down and is fixedly connected to the support platform (121).

2. The vehicle chassis according to claim 1, characterized in that, The portion of the side beam (1) located below the support platform (121) is provided with a through hole (16); the first fastening component can be fixedly connected to the tray (3) and the support platform (121) through the through hole (16).

3. The vehicle chassis according to claim 2, characterized in that, The first fastening assembly includes a first nut (51) and a first bolt (52). A first anti-rotation groove (31) is provided on the support plate (3), and a first anti-rotation surface (311) is provided on the first anti-rotation groove (31). The head end of the first bolt (52) is placed in the first anti-rotation groove (31) and can fit with the first anti-rotation surface (311) to prevent the first bolt (52) from rotating. The first nut (51) is connected to the screw of the first bolt (52) through the clearance hole (16).

4. The vehicle chassis according to claim 1, characterized in that, The bracket (2) also includes a main frame (22); the mounting base (21) includes a pressure plate (211) and a vertical plate (212) fixed to one end of the pressure plate (211) in the horizontal direction (X), the pressure plate (211) and the main frame (22) are located on both sides of the vertical plate (212) in the horizontal direction (X), and the pressure plate (211) is fixed above the bracket (3).

5. The vehicle chassis according to claim 4, characterized in that, The mounting base (21) also includes a support plate (213) fixed to the bottom of the upright plate (212). The support plate (213) and the pressure plate (211) are located on both sides of the upright plate (212) in the horizontal direction (X). The support plate (213) supports and is fixed to the bottom of the main frame (22).

6. The vehicle chassis according to claim 4, characterized in that, The mounting base (21) also includes a reinforcing rib (23), which includes a first reinforcing plate (231) fixed to the pressure plate (211) and the upright plate (212).

7. The vehicle chassis according to claim 6, characterized in that, The reinforcing rib (23) also includes a second reinforcing plate (232) fixed to the main frame (22) and the upright plate (212).

8. The vehicle chassis according to claim 4, characterized in that, It also includes a second fastening assembly, which includes a second nut (61) and a second bolt (62). A second anti-rotation groove (24) is provided on the pressure plate (211), and a second anti-rotation surface (241) is provided on the second anti-rotation groove (24). The head end of the second bolt (62) is placed behind the second anti-rotation groove (24) and can fit and cooperate with the second anti-rotation surface (241) to prevent the second bolt (62) from rotating. The second nut (61) is connected to the screw of the second bolt (62) through the installation channel (11).

9. The vehicle chassis according to any one of claims 1 to 8, characterized in that, The side beam (1) is an integrally formed structure.

10. A rail vehicle, characterized in that, The vehicle chassis includes any one of claims 1 to 9.

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