Chassis structure and railway vehicle

Abstract

The present application relates to the field of rail vehicle technology, and provides a kind of underframe structure and rail vehicle.The underframe structure includes underframe body, and the underframe body includes at least two cross beams, at least two longitudinal beams vertically fixed with the cross beams and a receiving member;Wherein a pair of longitudinal beams are arranged between two adjacent cross beams, and form a first recess area with a pair of longitudinal beams, and the upper side of a pair of longitudinal beams forms a support surface;The receiving member is fixedly arranged on the lower side of the first recess area, and is used to form a first oil storage tray structure in the first recess area.The underframe structure and rail vehicle provided by the present application can reasonably utilize the vertical passage area formed by the cross beams and longitudinal beams, effectively reduce the space occupied by the fuel engine on the upper side of the underframe structure during installation, make the structure design of the car body more compact and reasonable, and make the installation of the fuel engine more convenient.

Description

Technical Field

[0001] This invention relates to the field of rail vehicle technology, and more particularly to a chassis structure and a rail vehicle. Background Technology

[0002] In the existing technology, the underframe structure of rail vehicles is usually formed by welding together multiple crossbeams and longitudinal beams that are perpendicular to each other. The space requirements for equipment such as fuel engines and generators are not fully considered during the design process, resulting in a large space occupied on the upper side of the underframe structure, which is not conducive to the compact structural design of the car body. Summary of the Invention

[0003] This invention provides a chassis structure and a rail vehicle to solve the problem of the large space occupied by the fuel engine on the upper side of the chassis structure in the prior art, thereby reducing the space occupied by the fuel engine on the upper side of the chassis structure and making the installation and arrangement of the fuel engine more reasonable.

[0004] This invention provides a base frame structure, including a base frame body, the base frame body comprising:

[0005] At least two crossbeams and at least two longitudinal beams fixed perpendicularly to the crossbeams, wherein a pair of longitudinal beams are provided between two adjacent crossbeams and form a first recessed area with the pair of longitudinal beams, and the upper side of the pair of longitudinal beams forms a support surface;

[0006] A receiving component is fixedly disposed on the lower side of the first recessed area to form a first oil storage pan structure in the first recessed area.

[0007] According to the present invention, the crossbeam includes a first upper cover plate, a first lower cover plate, and a pair of first web plates vertically fixed between the first upper cover plate and the first lower cover plate. The first upper cover plate, the first lower cover plate, and the pair of first web plates form the inner cavity of the crossbeam.

[0008] The base frame structure provided by the present invention further includes:

[0009] At least two fuel tank hanging devices are provided, each of which is located on the underside of two of the crossbeams and has at least one connecting lug.

[0010] According to the base frame structure provided by the present invention, the fuel tank hanging device includes a fuel tank hanger, a first lower cover plate is provided with a lifting hole, the lifting hole is connected to the inner cavity of the crossbeam, the fuel tank hanger passes through the lifting hole, a limit plate is provided at the upper end of the fuel tank hanger, the limit plate overlaps with the upper side of the first lower cover plate, and the connecting lug is provided at the lower end of the fuel tank hanger.

[0011] According to the base frame structure provided by the present invention, the oil tank hanging device further includes a pair of stiffening plates, which are respectively placed on both sides of the lifting hole and are vertically fixedly connected to the first lower cover plate and the pair of first web plates.

[0012] According to the chassis structure provided by the present invention, a traction pin mounting seat is further included, wherein both ends of the traction pin mounting seat are fixedly connected to two adjacent crossbeams.

[0013] According to the present invention, the underframe structure includes a second upper cover plate, a second lower cover plate, a pair of second web plates connecting the second upper cover plate and the second lower cover plate, and a mounting plate disposed on the lower side of the second lower cover plate. The second upper cover plate and the second lower cover plate are respectively fixedly connected to the crossbeam.

[0014] According to the chassis structure provided by the present invention, two traction pin mounting seats are provided at intervals along the length direction of the chassis body;

[0015] At least one of the said traction pin mounting seats is provided with the following structure:

[0016] The traction pin mounting seat is recessed to the lower side to form a second recessed area, and the upper side of the traction pin mounting seat forms a second oil reservoir structure.

[0017] The base frame structure provided by the present invention further includes:

[0018] A pair of inner side beams, one of which is perpendicularly fixedly connected to one end of each of the cross beams, and the other inner side beam is perpendicularly fixedly connected to the other end of each of the cross beams.

[0019] A rail vehicle according to the present invention includes the aforementioned underframe structure.

[0020] The underframe structure and rail vehicle provided by this invention form a first recessed area through two adjacent crossbeams and a pair of longitudinal beams connecting the two adjacent crossbeams. This provides vertical installation space for the fuel engine. The upper side of the pair of longitudinal beams forms a support surface for supporting the fuel engine. The first oil reservoir structure formed by the receiving component in the first recessed area further meets the installation requirements of the fuel engine, eliminating the need for an additional oil reservoir. Therefore, the underframe structure and rail vehicle provided by this invention can make reasonable use of the vertical channel area formed by the crossbeams and longitudinal beams, effectively reducing the space occupied by the fuel engine on the upper side of the underframe structure during installation. This makes the structural design of the vehicle body more compact and reasonable, and makes the installation of the fuel engine more convenient. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a perspective view of the top structure representing the base frame structure provided by the present invention;

[0023] Figure 2 This is a perspective view of the bottom structure of the base frame structure provided by the present invention;

[0024] Figure 3 This is a perspective view of the top structure of the crossbeam in the base frame structure provided by the present invention;

[0025] Figure 4 This is a perspective view of the bottom structure of the crossbeam in the base frame structure provided by the present invention;

[0026] Figure 5 This is a schematic diagram of the stiffener plate installation structure of the base frame structure provided by the present invention;

[0027] Figure 6 yes Figure 3 AA section view;

[0028] Figure 7 This is a perspective view of the top structure of a traction pin mounting seat provided by the present invention.

[0029] Figure 8 This is a perspective view of the bottom structure of a traction pin mounting seat provided by the present invention.

[0030] Figure 9 This is a perspective view of the top structure of another traction pin mounting seat provided by the present invention;

[0031] Figure 10 This is a perspective view of another bottom structure of the traction pin mounting seat provided by the present invention;

[0032] Figure label:

[0033] 100. Base frame body; 110. Crossbeam; 111. First crossbeam; 1112. First upper cover plate; 1113. First lower cover plate; 1114. First web plate; 1115. Lifting hole; 1116. Reinforcing plate; 112. Second crossbeam; 120. Longitudinal beam; 121. First longitudinal beam; 1211. Support surface; 122. Second longitudinal beam; 130. First recessed area; 140. Receiving component; 200. Fuel tank lifting device; 210. Fuel tank lifting seat; 211. Limiting plate; 212. Connecting lug; 220. Rib plate; 300. Traction pin mounting seat; 310. Second upper cover plate; 320. Second lower cover plate; 321. Extension; 330. Second web plate; 340. Mounting plate; 350. Second recessed area; 400. Inner side beam. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0035] The following is combined Figures 1 to 10 The following describes a chassis structure according to an embodiment of the present invention. The chassis structure includes a chassis body 100, which includes at least two crossbeams 110, at least two longitudinal beams 120 perpendicularly fixed to the crossbeams 110, and a supporting member 140. A pair of longitudinal beams 120 are arranged between two adjacent crossbeams 110, forming a first recessed area 130. The upper side of the pair of longitudinal beams 120 forms a support surface 1211. The supporting member 140 is fixedly disposed on the lower side of the first recessed area 130 to form a first oil storage pan structure in the first recessed area 130.

[0036] by Figure 1 and Figure 2 Taking the structure described in the figure as an example, for ease of description, the two crossbeams 110 near the middle of the base frame body 100 are named the first crossbeam 111, and the remaining crossbeams 110 are named the second crossbeam 112. The longitudinal beam 120 located between the two first crossbeams 111 is named the first longitudinal beam 121, and the remaining longitudinal beams 122 are named the second longitudinal beam 122.

[0037] The ends of the two first longitudinal beams 121 are respectively fixed perpendicularly to the two first transverse beams 111. The fixing method can be bolt fixing or welding fixing, etc., and welding fixing is preferred in this embodiment. The rectangular area enclosed by the two first longitudinal beams 121 and the two first transverse beams 111 is the first recessed area 130. The first recessed area 130 can provide vertical installation space for the fuel engine (e.g., diesel engine). When the fuel engine is installed in the first recessed area 130, the support surface 1211 formed on the upper side of the first longitudinal beams 121 can support the fuel engine.

[0038] Optionally, a support surface 1211 is formed on the upper side of the crossbeams 110 (two first crossbeams 111) located around the first recessed area 130. The support surface 1211 on the upper side of the crossbeams 110 (two first crossbeams 111) and the support surface 1211 on the upper side of the longitudinal beams 120 (two first longitudinal beams 121) can jointly support the combustion engine. It is understood that the heights of the support surface 1211 formed on the upper side of the first longitudinal beams 121 and the support surface 1211 formed on the upper side of the first crossbeams 111 can be the same or different, depending on the structure of the combustion engine.

[0039] Optionally, the receiving member 140 is a plate-like structure, with a length greater than or equal to the length of the first recessed area 130, and a width greater than or equal to the width of the first recessed area 130. The receiving member 140 is welded and fixed to the lower side of the first longitudinal beam 121 and the first transverse beam 111, forming a seal. In some other embodiments, the receiving member 140 may also be configured as a box-like structure with an opening at the top, with the upper end of the receiving member 140 welded and fixed to the first longitudinal beam 121 and the first transverse beam 111.

[0040] Optionally, the receiving component 140 is made of stainless steel, which has good structural strength and stability. Of course, the receiving component 140 can also be made of other metals or non-metals, all of which should be within the protection scope of the embodiments of the present invention.

[0041] Optionally, in the chassis body 100 of this embodiment, the cross-sectional dimension of the first crossbeam 111 is larger than that of the second crossbeam 112, and the cross-sectional dimension of the first longitudinal beam 121 is larger than that of the second longitudinal beam 122. This strengthens the position of the chassis body 100 supporting the fuel engine, increasing the load-bearing capacity and structural stability of the chassis body 100.

[0042] Optionally, a pair of longitudinal beams 120 (i.e., first longitudinal beams 121) located around the first recessed area 130 are arranged on both sides of the longitudinal centerline of the underframe body 100. Further, the pair of longitudinal beams 120 located around the first recessed area 130 are symmetrically arranged about the longitudinal centerline of the underframe body 100, so that the underframe body 100 can be balanced in terms of force on the left and right sides when supporting the fuel engine.

[0043] like Figure 3 and Figure 4 As shown, in some possible embodiments of the present invention, the crossbeam 110 includes a first upper cover plate 1112, a first lower cover plate 1113, and a pair of first web plates 1114 vertically fixed between the first upper cover plate 1112 and the first lower cover plate 1113. The first upper cover plate 1112, the first lower cover plate 1113, and the pair of first web plates 1114 form the inner cavity of the crossbeam 110. This box-shaped crossbeam 110 effectively reduces the weight of the base frame structure while ensuring its robustness, thus meeting the requirements for lightweight construction.

[0044] Optionally, the distance between a pair of first web plates 1114 is less than the width of the first upper cover plate 1112 and the first lower cover plate 1113, so that lateral grooves are formed on both sides of the crossbeam 110, making the structure of the crossbeam 110 more stable, and the lateral grooves can provide a certain installation space for the connection between the longitudinal beam 120 and the crossbeam 110.

[0045] It should be noted that, in this embodiment of the invention, the number of first web plates 1114 is preferably two. In some other embodiments, the number of first web plates 1114 can be one or more, as long as the structural strength requirements and installation space requirements of the crossbeam 110 can be met.

[0046] In some possible embodiments of the present invention, the first longitudinal beam 121 adopts a box-shaped structure. It is understood that the box-shaped structure adopted by the first longitudinal beam 121 is the same as or similar to the box-shaped structure of the cross beam 110, which will not be described in detail here.

[0047] Optionally, the second longitudinal beam 122 adopts a C-shaped structure made of bent sheet metal.

[0048] Optionally, reinforcing plates are provided on the upper and lower sides of both ends of the longitudinal beam 120. These reinforcing plates are triangular or approximately triangular and are suitable for welding and fixing to the cross beam 110. By providing reinforcing plates, the connection strength between the longitudinal beam 120 and the cross beam 110 can be increased, reducing the risk of cracking at the joint.

[0049] See you later Figure 2 In some possible embodiments of the present invention, the base frame structure further includes at least two fuel tank hanging devices 200, each fuel tank hanging device 200 being disposed on the underside of two of the crossbeams 110, and each fuel tank hanging device 200 being provided with at least one connecting lug 212. The fuel tank can be suspended on the underside of the base frame structure through the combined action of the fuel tank hanging devices 200. Specifically, the upper side of the fuel tank is provided with lifting lugs adapted to each fuel tank hanging device 200, and each lifting lug is connected to the corresponding connecting lug 212 via a connecting pin, thereby enabling the suspension of the fuel tank.

[0050] Optionally, the fuel tank suspension device 200 is provided with two or more connecting ears 212, each connecting ear 212 being spaced apart along the length of the crossbeam 110, and the through holes of each connecting ear 212 being axially aligned so that the same connecting pin can be inserted. This can increase the stability and robustness of the connection structure between the fuel tank suspension device 200 and the fuel tank.

[0051] Optionally, two fuel tank hanging devices 200 are respectively provided on the two crossbeams 110, and each fuel tank hanging device 200 corresponds to the position of the fuel tank near the four corners.

[0052] Combination Figure 5 and Figure 6 In some possible embodiments of the present invention, the fuel tank suspension device 200 includes a fuel tank support 210. The first lower cover plate 1113 of the crossbeam 110 on which the fuel tank suspension device 200 is located is provided with a lifting hole 1115, which communicates with the inner cavity of the crossbeam 110. The shape of the lifting hole 1115 is adapted to the fuel tank support 210, for example, it can be a rectangular hole. The fuel tank support 210 passes through the lifting hole 1115. A limiting plate 211 is provided at the upper end of the fuel tank support 210, which overlaps with the upper side of the first lower cover plate 1113, enabling vertical movement limitation of the fuel tank support 210. A connecting lug 212 is provided at the lower end of the fuel tank support 210.

[0053] Optionally, the limiting plate 211 is welded and fixed to the first lower cover plate 1113 and / or the fuel tank hanger 210 is welded and fixed to the first lower cover plate 1113, thereby preventing the fuel tank hanger 210 from moving upward.

[0054] In some possible embodiments of the present invention, the fuel tank suspension device 200 further includes a pair of stiffening plates 220, which are respectively placed on both sides of the lifting hole 1115 and vertically fixedly connected to the first lower cover plate 1113 and a pair of first web plates 1114. In this embodiment, the stiffening plates 220 are welded and fixed to the first lower cover plate 1113 and to the first web plates 1114, which can increase the tensile strength at the connection position between the crossbeam 110 and the fuel tank suspension bracket 210.

[0055] The installation process of the fuel tank hanging device 200 in the embodiment of the present invention is briefly described below: First, a lifting hole 1115 adapted to the fuel tank hanger 210 is opened on the first lower cover plate 1113 of the crossbeam 110. After the welding of the first lower cover plate 1113 and the first web plate 1114 is completed, the stiffening plate 220 is welded and fixed on both sides of the lifting hole 1115. Then, the fuel tank hanger 210 is hung in the lifting hole 1115 and welded and fixed. Finally, the first upper cover plate 1112 is welded and fixed to the upper end of the first web plate 1114.

[0056] Optionally, the first lower cover plate 1113 of the crossbeam 110 is configured as a reinforcing plate 1116 in the mounting area of ​​the tank hanger 210. The reinforcing plate 1116 is a plate structure formed by increasing the thickness and width of the first lower cover plate 1113 in a local area. The reinforcing plate 1116 can distribute concentrated loads, so that the crossbeam 110 is evenly loaded, and improve the connection strength of the tank hanger 200.

[0057] According to the base frame structure of the present invention, the oil tank hanging device 200 is installed by hanging, which has many advantages such as accurate positioning, structural stability and small space occupation.

[0058] See you later Figure 2 In some embodiments of the present invention, the underframe structure further includes a traction pin mounting seat 300, the two ends of which are fixedly connected to two adjacent crossbeams 110. Specifically, the traction pin mounting seat 300 is disposed between two crossbeams 110 near the end of the underframe body 100, one end of the traction pin mounting seat 300 is perpendicularly fixed to one of the crossbeams 110, and the other end of the traction pin mounting seat 300 is perpendicularly fixed to the other crossbeam 110.

[0059] Optionally, the underframe body 100 is provided with second longitudinal beams 122 on both sides of the traction pin mounting seat 300, and the two ends of the second longitudinal beams 122 are fixedly connected to the corresponding crossbeams 110. In this scheme, the traction pin mounting seat 300 is arranged between the two longitudinal beams 120 and the two crossbeams 110 forming a square structure, which can increase the load-bearing capacity of the underframe body 100 at the mounting position of the traction pin mounting seat 300, and make the structural stability of the underframe structure better.

[0060] Combination Figures 7 to 10 In some possible embodiments of the present invention, the traction pin mounting base 300 includes a second upper cover plate 310, a second lower cover plate 320, a pair of second web plates 330 connecting the second upper cover plate 310 and the second lower cover plate 320, and a mounting plate 340 disposed on the lower side of the second lower cover plate 320. The second upper cover plate 310, the second lower cover plate 320, and the pair of second web plates 330 can enable the traction pin mounting base 300 to form a box-type structure. The second upper cover plate 310 and the second lower cover plate 320 are respectively fixedly connected to the crossbeam 110. Specifically, the second upper cover plate 310 is welded and fixed to the first upper cover plate 1112 of the crossbeam 110, and the second lower cover plate 320 is welded and fixed to the first lower cover plate 1113 of the crossbeam 110.

[0061] Optionally, at least one of the second upper cover plate 310 and the second web plate 330 is configured as a hollow structure, thereby reducing the overall weight of the base frame structure.

[0062] In this embodiment, the lower end of the second web plate 330 protrudes towards the lower side of the base frame body 100, and the second lower cover plate 320 is configured as a bent plate structure that matches the protrusion at the lower end of the second web plate 330.

[0063] Optionally, the second lower cover plate 320 is provided with extensions 321 at both ends. The extensions 321 are located on the lower side of the connected crossbeam 110 and are welded and fixed to the lower side of the connected crossbeam 110. This makes the connection between the traction pin mounting seat 300 and the base frame body 100 more stable and provides better load-bearing capacity.

[0064] Combination Figure 2 , Figure 9 and Figure 10 In some possible embodiments of the present invention, two traction pin mounting seats 300 are provided at intervals along the length direction of the base frame body 100, and the two traction pin mounting seats 300 are respectively provided at positions near both ends of the base frame body 100.

[0065] At least one of the traction pin mounting seats 300 is provided with the following structure:

[0066] The traction pin mounting seat 300 is recessed to the lower side to form a second recessed area 350, and the upper side of the traction pin mounting seat 300 forms a second oil reservoir structure.

[0067] Optionally, the second upper cover plate 310 of one of the traction pin mounting seats 300 adopts a bent plate structure. The middle of the second upper cover plate 310 is recessed downward, so that its middle part is lower than the upper surface of the crossbeam 110 and longitudinal beam 120 around the traction pin mounting seat 300, thereby forming a second recessed area 350. The two ends of the second upper cover plate 310 extend to the upper side of the longitudinal beams 120 on both sides and are welded and fixed to the corresponding longitudinal beams 120 respectively.

[0068] Optionally, the crossbeam 110 located at one end of the base frame body 100 is provided with a downwardly bent section that connects with the second recessed area 350.

[0069] The chassis structure of this embodiment of the invention provides installation space for the generator by forming a second recessed area 350 and a second oil reservoir structure at the position of the traction pin mounting seat 300. This allows the generator to occupy the space on the upper surface and below the upper surface of the chassis body 100 during installation, thereby making the vehicle body structure more compact. In addition, since there is a strong connection structure between the traction pin mounting seat 300 and the chassis body 100, it can provide good support for the generator.

[0070] See you later Figure 1 and Figure 2In some possible embodiments of the present invention, the base frame structure further includes a pair of inner side beams 400, one of which is vertically fixedly connected to one end of each crossbeam 110, and the other inner side beam 400 is vertically fixedly connected to the other end of each crossbeam 110.

[0071] Optionally, the inner side beam 400 extends from one end of the base frame body 100 to the other end of the base frame body 100.

[0072] Optionally, reinforcing plates are provided on the upper and lower sides of both ends of the crossbeam 110. These reinforcing plates are triangular or approximately triangular and are suitable for welding and fixing to the crossbeam 110. By providing reinforcing plates, the connection strength between the crossbeam 110 and the inner side beam 400 can be increased, reducing the risk of cracking at the joint.

[0073] In this embodiment of the invention, by setting the inner side beam 400, the connection strength between the base frame structure and the outer side beam can be increased, forming a double-sided beam structure.

[0074] In some specific embodiments of the present invention, a rail vehicle is also provided, including the aforementioned underframe structure.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A base frame structure, characterized in that, Includes a base frame body (100), the base frame body (100) comprising: At least two crossbeams (110) and at least two longitudinal beams (120) fixed perpendicularly to the crossbeams (110), wherein a pair of longitudinal beams (120) are provided between two adjacent crossbeams (110) and together with the pair of longitudinal beams (120) form a first recessed area (130), and the upper side of the pair of longitudinal beams (120) forms a support surface (1211). The receiving part (140) is fixedly disposed on the lower side of the first recessed area (130) for forming a first oil storage plate structure in the first recessed area (130); It also includes a traction pin mounting bracket (300); Two traction pin mounting seats (300) are provided at intervals along the length direction of the base frame body (100); At least one of the said traction pin mounting seats (300) is provided with the following structure: The traction pin mounting seat (300) is recessed to the lower side to form a second recessed area (350), and the upper side of the traction pin mounting seat (300) forms a second oil storage plate structure.

2. The base frame structure according to claim 1, characterized in that, The crossbeam (110) includes a first upper cover plate (1112), a first lower cover plate (1113), and a pair of first web plates (1114) vertically fixed between the first upper cover plate (1112) and the first lower cover plate (1113). The first upper cover plate (1112), the first lower cover plate (1113), and the pair of first web plates (1114) form the inner cavity of the crossbeam (110).

3. The base frame structure according to claim 2, characterized in that, Also includes: At least two fuel tank hanging devices (200) are provided, each fuel tank hanging device (200) is located on the underside of two of the crossbeams (110), and each fuel tank hanging device (200) is provided with at least one connecting lug (212).

4. The base frame structure according to claim 3, characterized in that, The fuel tank hanging device (200) includes a fuel tank hanger (210), the first lower cover plate (1113) is provided with a lifting hole (1115), the lifting hole (1115) is connected to the inner cavity of the crossbeam (110), the fuel tank hanger (210) passes through the lifting hole (1115), the upper end of the fuel tank hanger (210) is provided with a limiting plate (211), the limiting plate (211) overlaps with the upper side of the first lower cover plate (1113), and the lower end of the fuel tank hanger (210) is provided with a connecting lug (212).

5. The base frame structure according to claim 4, characterized in that, The fuel tank hanging device (200) also includes a pair of stiffening plates (220), which are placed on both sides of the lifting hole (1115) and are respectively vertically fixedly connected to the first lower cover plate (1113) and the pair of first web plates (1114).

6. The base frame structure according to any one of claims 1 to 5, characterized in that, The two ends of the traction pin mounting seat (300) are fixedly connected to the two adjacent crossbeams (110).

7. The base frame structure according to claim 6, characterized in that, The traction pin mounting seat (300) includes a second upper cover plate (310), a second lower cover plate (320), a pair of second web plates (330) connecting the second upper cover plate (310) and the second lower cover plate (320), and a mounting plate (340) disposed on the lower side of the second lower cover plate (320). The second upper cover plate (310) and the second lower cover plate (320) are respectively fixedly connected to the crossbeam (110).

8. The base frame structure according to claim 1, characterized in that, Also includes: A pair of inner side beams (400), one of which is vertically fixedly connected to one end of each of the cross beams (110), and the other inner side beam (400) is vertically fixedly connected to the other end of each of the cross beams (110).

9. A rail vehicle, characterized in that, Includes the chassis structure as described in any one of claims 1 to 8.

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