Vehicle chassis and rail vehicles

Abstract

The present invention relates to the field of rail vehicle technology, and provides a vehicle underframe and a rail vehicle. The vehicle underframe includes a side beam, a first crossbeam, and a second crossbeam. The first crossbeam is connected between two oppositely arranged side beams, and the first crossbeam includes a first beam section and a second beam section located at at least one end of the first beam section. The second crossbeam is connected between two oppositely arranged first crossbeams, and the first beam section is located between two opposite second crossbeams. The top of the first beam section and the top of the second crossbeam form a first installation area for installing a light-transmitting component, and the bottom of the first beam section and the bottom of the second crossbeam form a second installation area for installing a light-emitting component. The vehicle underframe provided by the present invention is used to solve the defect that the functions of the vehicle underframe in the prior art are not perfect. Through the cooperation of the first crossbeam and the second crossbeam, it has a first installation area for installing a light-transmitting component and a second installation area for installing a light-emitting component, thereby optimizing the function and structure of the vehicle underframe.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and in particular to a vehicle underframe and a rail vehicle. Background Art

[0002] Rail vehicles need to meet structural strength requirements, as well as meet users' sightseeing needs, optimize the structure and weight of the vehicle chassis, and optimize the appearance of the vehicle. Due to the structural limitations of rail vehicles, it is difficult to meet multiple needs at the same time. Summary of the Invention

[0003] The present invention provides a vehicle underframe to address the defect of incomplete functions of vehicle underframes in the prior art. By cooperating with a first crossbeam and a second crossbeam, a first mounting area for mounting a light-transmitting member and a second mounting area for mounting a luminous member are provided, thereby enabling the installation of the light-transmitting member and the luminous member, and optimizing the function and structure of the vehicle underframe.

[0004] The present invention provides a vehicle underframe, comprising:

[0005] edge beams;

[0006] a first crossbeam connected between two oppositely disposed side beams, the first crossbeam comprising a first beam section and a second beam section located at at least one end of the first beam section;

[0007] a second crossbeam connected between two oppositely arranged first crossbeams, wherein the first beam section is located between the two oppositely arranged second crossbeams;

[0008] The top of the first beam section and the top of the second cross beam form a first installation area for installing a light-transmitting component, and the bottom of the first beam section and the bottom of the second cross beam form a second installation area for installing a light-emitting component.

[0009] According to a vehicle underframe provided by the present invention, the first crossbeam includes a first side wall and a second side wall arranged opposite to each other, a first channel with a bottom opening is formed between the first side wall and the second side wall of the first beam section, the second crossbeam includes a third side wall and a fourth side wall arranged opposite to each other, a second channel with a bottom opening is formed between the third side wall and the fourth side wall, the first channel is connected to the second channel, the first side wall and the third side wall are connected by a first curved plate, the second side wall and the fourth side wall are connected by a second curved plate, and a spacing is provided between the first curved plate and the second curved plate to form a mounting opening.

[0010] According to the vehicle underframe provided by the present invention, a first notch is provided between the first curved plate, the first beam section, and the second cross beam; a first connecting plate is connected between the first curved plate, the first beam section, and the second cross beam, and the first connecting plate closes the first notch;

[0011] A second gap is provided between the second curved plate, the first beam section and the second cross beam. A second connecting plate is connected between the second curved plate, the first beam section and the second cross beam, and the second connecting plate closes the second gap.

[0012] According to a vehicle underframe provided by the present invention, the first side wall and the second side wall are connected by a first connecting wall, the third side wall and the fourth side wall are connected by a second connecting wall, and one or more of the first connecting wall and the second connecting wall are provided with a wiring opening, and the wiring opening connects one or more of the first channel and the second channel.

[0013] According to a vehicle underframe provided by the present invention, a floor connecting plate and / or a sub-floor connecting plate is connected to one or more of the outer sides of the first side wall of the first cross beam and the outer sides of the third side wall of the second cross beam, the outer side of the first side wall faces away from the first installation area, the outer side of the third side wall faces away from the first installation area, and the floor connecting plate is not higher than the first installation area.

[0014] According to the vehicle underframe provided by the present invention, one or more of the first crossbeam and the second crossbeam has a plurality of cavities arranged in a vertical direction.

[0015] According to a vehicle underframe provided by the present invention, a first hole is opened on the first side wall of the second beam section, a second hole is opened on the second side wall of the second beam section, the first side wall and the second side wall are arranged opposite to each other, the first hole and the second hole are connected through the cavity, and adjacent cavities are connected.

[0016] According to the vehicle underframe provided by the present invention, drainage holes are provided on one or more wall surfaces of the first cross beam and the second cross beam.

[0017] According to the vehicle underframe provided by the present invention, when one or more of the first crossbeam and the second crossbeam has a plurality of cavities arranged in a vertical direction, adjacent cavities are connected through the drainage holes.

[0018] The present invention also provides a rail vehicle, comprising: a vehicle underframe as described in any one of the above items.

[0019] The vehicle underframe provided by the present invention includes a side beam, a first cross beam and a second cross beam. The tops of the first cross beam and the second cross beam form a first installation area for installing a light-transmitting member, and the bottoms of the first cross beam and the second cross beam form a second installation area for installing a luminous member. The first cross beam cooperates with the second cross beam so that the vehicle underframe has the dual function of installing the light-transmitting member and the luminous member. The structure is simple and has little impact on other structures of the vehicle underframe, which helps to control production and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the top view of the vehicle underframe provided by the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of the partially enlarged structure of part A in the middle;

[0023] Figure 3 This is a schematic diagram of the bottom view of the vehicle underframe provided by the present invention;

[0024] Figure 4 yes Figure 3 Schematic diagram of the partial enlarged structure of part B in the middle;

[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the first crossbeam of the vehicle underframe provided by the present invention, viewed from the side and above;

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of the first crossbeam of the vehicle underframe provided by the present invention, viewed from the side and below;

[0027] Figure 7 It is a partial structural schematic diagram of the connection state between the first crossbeam and the floor of the vehicle underframe provided by the present invention.

[0028] Reference numerals:

[0029] 100, side beam;

[0030] 200, first crossbeam; 210, first beam section; 220, second beam section; 230, first side wall; 231, first hole; 232, auxiliary plate; 240, second side wall; 241, second hole; 250, first passage; 260, first connecting wall; 261, wiring opening; 270, floor connecting plate; 280, sub-floor connecting plate; 290, cavity; 2010, drainage hole;

[0031] 300, second crossbeam; 310, third side wall; 320, fourth side wall; 330, second channel;

[0032] 400, first installation area; 500, second installation area; 610, first curved plate; 620, second curved plate; 630, first connecting plate; 640, second connecting plate; 650, installation opening; 700, floor. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0034] The following combination Figures 1 to 7 The vehicle underframe of the present invention includes a side member 100 , a first cross member 200 and a second cross member 300 .

[0035] The first crossbeam 200 is connected between the two side beams 100 disposed opposite to each other, and the second crossbeam 300 is connected between the two first crossbeams 200 disposed opposite to each other. The two side beams 100 disposed opposite to each other can be parallel to each other or form an angle. The positional relationship between the two side beams 100 is not limited. Figure 1 and Figure 3 As shown, the two side beams 100 are parallel. The two first beams 200 arranged opposite to each other can be parallel to each other or form an angle. The positional relationship between the two first beams 200 is not limited. Figure 1 and Figure 3 As shown, the two first crossbeams 200 are parallel. The side beams 100, the first crossbeam 200, and the second crossbeam 300 can all be understood as extending in the horizontal direction, and the height direction of the side beams 100, the first crossbeam 200, and the second crossbeam 300 can be understood as the vertical direction, that is, the up-down direction of the vehicle underframe in use is the vertical direction.

[0036] The first crossbeam 200 includes a first beam section 210 and a second beam section 220 located at at least one end of the first beam section 210. The first beam section 210 is located between two opposing second crossbeams 300. The first beam section 210 is used to cooperate with the second crossbeams 300 to mount light-transmitting components, light-emitting components (not shown), etc. The second beam section 220 can be used to mount the floor 700. For example, at least one of the second crossbeam 300 or the side beam 100 cooperates with the second beam section 220 to mount at least one of the floor 700 or the sub-floor (not shown).

[0037] refer to Figure 1 and Figure 2 As shown, the top of the first beam section 210 and the top of the second beam 300 form a first installation area 400 for installing a light-transmitting member. Figure 3 and Figure 4 As shown, the bottom of the first beam section 210 and the bottom of the second crossbeam 300 enclose a second mounting area 500 for mounting a light-emitting component. The first crossbeam 200 and the second crossbeam 300 cooperate to provide a first mounting area 400 for mounting a light-transmitting component at their tops and a second mounting area 500 for mounting a light-emitting component at their bottoms. The combination of these two crossbeams allows the vehicle underframe to function as a dual-purpose mounting platform for both light-transmitting and light-emitting components. This simple structure minimizes impact on other underframe components, helping to control manufacturing costs.

[0038] In some cases, the top surface of the first beam section 210 and the top surface of the second crossbeam 300 form a first installation area 400. The first installation area 400 is an area formed by splicing multiple top surfaces. The first beam section 210 and the second crossbeam 300 play a role in supporting the light-transmitting component.

[0039] The vehicle underframe of the present invention is suitable for use as an underframe structure for a suspended vehicle, particularly a sightseeing vehicle. While ensuring vehicle structural strength, the ingenious crossbeam design integrates a first mounting area 400 for a light-transmitting component and a second mounting area 500 for a light-emitting component, while maintaining an aesthetically pleasing vehicle appearance. The first and second crossbeams 200 and 300 integrate the mounting functions of the light-transmitting and light-emitting components, simplifying the structure of other vehicle underframe components, reducing the weight of the vehicle underframe and ultimately contributing to the goal of lightweighting rail vehicles.

[0040] The term "translucent component" can be understood as a component made of a translucent material such as glass or resin. The term "luminous component" can be understood as a lamp, such as a light strip or a light tube. The luminous component can be an exterior decorative light strip.

[0041] refer to Figure 1 and Figure 3As shown, two opposite first beam sections 210 and two opposite second beams 300 enclose an installation space, which may be a quadrilateral space. The two ends of the first beam section 210 are connected to the second beam section 220.

[0042] In some embodiments, reference Figure 4 and Figure 5 As shown, the first crossbeam 200 includes a first sidewall 230 and a second sidewall 240 disposed opposite each other. A first channel 250 with a bottom opening is formed between the first sidewall 230 and the second sidewall 240 of the first beam section 210. This allows the light-emitting component to enter the first channel 250 through the opening of the first channel 250, thereby enabling the light-emitting component to be installed with the first beam section 210. The first sidewall 230 and the second sidewall 240 can be understood as sidewalls extending in the vertical direction. The first sidewall 230 faces away from the installation space, while the second sidewall 240 faces the installation space.

[0043] The second crossbeam 300 includes a third sidewall 310 and a fourth sidewall 320 disposed opposite each other. A second channel 330 with a bottom opening is formed between the third sidewall 310 and the fourth sidewall 320. This allows the light-emitting component to enter the second channel 330 through the opening of the second channel 330, thereby enabling the light-emitting component to be installed on the second crossbeam 300. The third sidewall 310 faces away from the installation space, while the fourth sidewall 320 faces the installation space.

[0044] Based on the positional relationship between the first beam 200 and the second beam 300 , the first channel 250 and the second channel 330 have an included angle, and the first channel 250 and the second channel 330 are connected, so that the light emitting element can be installed with the first beam 200 and the second beam 300 .

[0045] refer to Figure 3 and Figure 4 As shown, the first side wall 230 and the third side wall 310 are connected by a first curved plate 610, and the second side wall 240 and the fourth side wall 320 are connected by a second curved plate 620, so that an arc-shaped corner is formed between the first beam 200 and the second beam 300 to accommodate light-emitting parts with arc-shaped corners, such as U-shaped lamp parts.

[0046] There is a gap between the first curved plate 610 and the second curved plate 620 to form an installation opening 650 , so that the light emitting element can enter the first channel 250 and the second channel 330 through the installation opening 650 , making installation of the light emitting element simple and convenient.

[0047] The structure of the first beam 200 and the second beam 300 is optimized. By setting the first curved plate 610 and the second curved plate 620, a "U"-shaped groove is formed in the second installation area 500 for the light-emitting component. While ensuring a beautiful appearance, the "U"-shaped groove is used to install the "U"-shaped light-emitting component, and the overall transition is smooth and the appearance is beautiful.

[0048] In some embodiments, there is a first gap (not shown in the figure) between the first curved plate 610, the first beam section 210 and the second cross beam 300, and a first connecting plate 630 is connected between the first curved plate 610, the first beam section 210 and the second cross beam 300. The first connecting plate 630 closes the first gap to prevent the vehicle underframe from having a gap, thereby making the vehicle underframe more integrated.

[0049] A second gap (not shown) is provided between the second curved plate 620, the first beam section 210 and the second cross beam 300. A second connecting plate 640 is connected between the second curved plate 620, the first beam section 210 and the second cross beam 300. The second connecting plate 640 closes the second gap, thereby preventing a gap from forming in the vehicle underframe and enhancing the integrity of the vehicle underframe.

[0050] In some embodiments, the first sidewall 230 and the second sidewall 240 are connected by a first connecting wall 260, which can be understood as extending horizontally. The third sidewall 310 and the fourth sidewall 320 are connected by a second connecting wall, which can be understood as extending horizontally. One or more of the first connecting wall 260 and the second connecting wall are provided with a wiring opening 261, which connects to one or more of the first channel 250 and the second channel 330. The wiring opening 261 enables at least one of the first crossbeam 200 and the second crossbeam 300 to function as a wiring connection for light-emitting components. The first beam section 210 and the second crossbeam 300 both have a cavity 290, and the wiring opening 261 connects the cavity 290 to the first channel 250, or alternatively, connects the cavity 290 to the second channel 330. Light-emitting components can be electrically connected through the wiring opening 261. The first connecting wall 260, the first sidewall 230, and the second sidewall 240 are integrally formed. The second connecting wall, the third side wall 310 and the fourth side wall 320 are integrally formed.

[0051] refer to Figure 3 As shown, the first beam section 210 opens a wiring opening 261, which connects the cavity 290 of the first beam section 210 with the first channel 250, and the first channel 250 is connected with the second channel 330, and the connection between the first channel 250 and the second channel 330 is an arc-shaped transition.

[0052] In some embodiments, a floor connection plate 270 and / or a sub-floor connection plate 280 are connected to the outer side of the first side wall 230 of the first crossbeam 200. The outer side of the first side wall 230 faces away from the first installation area 400, and the floor connection plate 270 is no higher than the first installation area 400. The first crossbeam 200 is used to mount the floor 700 and the sub-floor. The floor connection plate 270 is located near the top of the first side wall 230, and the sub-floor connection plate 280 is located near the bottom of the first side wall 230. Both the floor connection plate 270 and the sub-floor connection plate 280 are integrally formed with the first side wall 230 of the first crossbeam 200. In some cases, the second side wall 240 of the second beam section 220 of the first crossbeam 200 is also formed with the floor connection plate 270 and the sub-floor connection plate 280. However, the second side wall 240 of the first beam section 210 of the first crossbeam 200 is not provided with a floor connection plate or a sub-floor connection plate to avoid affecting light transmission.

[0053] refer to Figure 5 As shown, an auxiliary plate 232 is connected to the top of the first side wall 230 . The auxiliary plate 232 serves to assist in supporting the floor 700 . The auxiliary plate 232 cooperates with the floor connecting plate 270 to improve the installation stability of the floor 700 .

[0054] In some other embodiments, a floor connecting plate and / or a sub-floor connecting plate are connected to the outer side of the third side wall 310 of the second crossbeam 300. The outer side of the third side wall 310 faces away from the first mounting area 400, and the floor connecting plate is no higher than the first mounting area 400. The second crossbeam 300 functions as a mounting base for the floor and sub-floor. The floor connecting plate and / or the sub-floor connecting plate are integrally formed with the third side wall 310 of the second crossbeam 300. The floor connecting plate 270 is located near the top of the third side wall 310, and the sub-floor connecting plate 280 is located near the bottom of the third side wall 310. While the accompanying drawings do not provide a detailed diagram of the components of the second crossbeam 300, the structure of the second crossbeam 300 can be referenced to the first beam section 210 of the first crossbeam 200.

[0055] When the first crossbeam 200 or the second crossbeam 300 has both the floor connecting plate 270 and the sub-floor connecting plate 280 , the installation of the sub-floor can be simplified without changing the structure of the floor to achieve the installation of the sub-floor.

[0056] refer to Figure 5 and Figure 7 As shown, based on the thickness of the floor being less than or equal to the thickness of the light-transmitting member, the floor connecting plate 270 is no higher than the first installation area 400, which can ensure that the floor 700 is coplanar with the top of the light-transmitting member, making the vehicle chassis more integrated.

[0057] refer to Figure 6As shown, the second side wall 240 of the first crossbeam 200 is provided with an installation opening 242 , and the second crossbeam 300 is connected to the side wall of the installation opening 242 , which facilitates the positioning and installation of the second crossbeam 300 .

[0058] In some embodiments, reference Figure 5 and Figure 6 As shown, one or more of the first beam 200 and the second beam 300 has a plurality of cavities 290 arranged vertically, which ensures the height of the first beam 200 and the second beam 300 and reduces the weight of the first beam 200 and the second beam 300.

[0059] In some embodiments, a first hole 231 is provided on the first side wall 230 of the second beam section 220, and a second hole 241 is provided on the second side wall 240 of the second beam section 220. The first hole 231 and the second hole 241 are connected through the cavity 290. The adjacent cavities 290 are connected, which can reduce the weight of the second beam section 220 and can also cooperate with the wiring function (such as passing the power supply line of the light-emitting component) and the drainage function.

[0060] In some embodiments, reference Figure 5 As shown, one or more walls of the first beam 200 and the second beam 300 are provided with drainage holes 2010 to prevent water accumulation in the first beam 200 or the second beam 300, which also helps to reduce weight and ensure the structural strength and stability of the first beam 200 and the second beam 300.

[0061] In some embodiments, when one or more of the first beam 200 and the second beam 300 have multiple cavities 290 arranged vertically, adjacent cavities 290 are connected via drainage holes 2010, with at least one drainage hole 2010 communicating with the external environment to drain water accumulated in the first beam 200 or the second beam 300. The drainage holes 2010 cooperate with the cavities 290 to form a drainage channel, ensuring that each cavity 290 has a drainage hole 2010 to prevent water from accumulating in any one cavity 290.

[0062] In some embodiments, the structure of the first beam section 210 of the first crossbeam 200 is the same as that of the second crossbeam 300. The first beam section 210 and the second crossbeam 300 cooperate to have the function of installing light-transmitting parts, light-emitting parts, floors, and sub-floors. The second beam section 220 of the first crossbeam 200 has the function of installing floors and sub-floors, and is connected to the side beam 100 through the end of the second beam section 220. The first beam section 210 and the second beam section 220 can be formed as one piece, or they can be fixedly connected by welding, bonding, etc. The connection method of the first beam section 210 and the second beam section 220 is not limited. The connection method of the first crossbeam 200 and the second crossbeam 300 can be welding, bonding, etc., which is not limited.

[0063] In suspended rail vehicles (such as suspended monorails), the underframe is equipped with exterior decorative lighting strips and sightseeing glass to maximize the visual experience. Furthermore, to enhance the aesthetics of the exposed underframe surface, a subfloor is installed beneath the underframe. The underframe not only provides a 360-degree viewing angle through the sightseeing glass, but the first and second crossbeams 200 and 300 also accommodate both the sightseeing glass and the floor, ensuring load-bearing structural strength.

[0064] The first crossbeam 200 and the second crossbeam 300 are both body profiles with multiple interfaces. On the premise of meeting the strength requirements of the body structure, the first crossbeam 200 and the second crossbeam 300 integrate the installation of exterior decorative light strips, sightseeing glass, chassis floor and lower floor of the vehicle, perfectly solving the problems of multi-interface compatibility and structural strength, while also taking into account the aesthetic requirements of the vehicle's exterior styling, helping to reduce the number of parts with installation functions, reducing the weight of the body chassis, and achieving the goal of lightweighting the vehicle.

[0065] According to another aspect of the present invention, there is provided a rail vehicle comprising the vehicle underframe as described above.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A vehicle underframe, characterized in that: include: Edge beam (100); a first crossbeam (200) connected between two side beams (100) disposed opposite to each other, the first crossbeam (200) comprising a first beam section (210) and a second beam section (220) located at at least one end of the first beam section (210); A second crossbeam (300) is connected between two first crossbeams (200) that are arranged opposite to each other, and the first beam section (210) is located between the two opposite second crossbeams (300); The top of the first beam section (210) and the top of the second cross beam (300) form a first installation area (400) for installing a light-transmitting component, and the bottom of the first beam section (210) and the bottom of the second cross beam (300) form a second installation area (500) for installing a light-emitting component. The first crossbeam (200) comprises a first side wall (230) and a second side wall (240) arranged opposite to each other, a first channel (250) with a bottom opening is formed between the first side wall (230) and the second side wall (240) of the first beam section (210), the second crossbeam (300) comprises a third side wall (310) and a fourth side wall (320) arranged opposite to each other, a second channel (330) with a bottom opening is formed between the third side wall (310) and the fourth side wall (320), the first channel (250) is communicated with the second channel (330), the first side wall (230) and the third side wall (310) are connected via a first curved plate (610), the second side wall (240) and the fourth side wall (320) are connected via a second curved plate (620), and a spacing is provided between the first curved plate (610) and the second curved plate (620) to form a mounting opening (650).

2. The vehicle underframe according to claim 1, characterized in that A first notch is provided between the first curved plate (610), the first beam section (210) and the second crossbeam (300); a first connecting plate (630) is connected between the first curved plate (610), the first beam section (210) and the second crossbeam (300); the first connecting plate (630) closes the first notch; A second gap is provided between the second curved plate (620), the first beam section (210) and the second crossbeam (300); a second connecting plate (640) is connected between the second curved plate (620), the first beam section (210) and the second crossbeam (300); the second connecting plate (640) closes the second gap.

3. The vehicle underframe according to claim 1, characterized in that The first side wall (230) and the second side wall (240) are connected via a first connecting wall (260), and the third side wall (310) and the fourth side wall (320) are connected via a second connecting wall. One or more of the first connecting wall (260) and the second connecting wall are provided with a wiring opening (261), and the wiring opening (261) is connected to one or more of the first channel (250) and the second channel (330).

4. The vehicle underframe according to claim 1, wherein: One or more of the outer sides of the first side wall (230) of the first crossbeam (200) and the outer sides of the third side wall (310) of the second crossbeam (300) are connected with a floor connecting plate (270) and / or a sub-floor connecting plate (280); the outer side of the first side wall (230) faces away from the first installation area (400); the outer side of the third side wall (310) faces away from the first installation area (400); and the floor connecting plate (270) is not higher than the first installation area (400).

5. The vehicle underframe according to claim 1, characterized in that One or more of the first crossbeam (200) and the second crossbeam (300) has a plurality of cavities (290) arranged in a vertical direction.

6. The vehicle underframe according to claim 5, characterized in that The first side wall (230) of the second beam section (220) is provided with a first hole (231), and the second side wall (240) of the second beam section (220) is provided with a second hole (241). The first side wall (230) and the second side wall (240) are arranged opposite to each other. The first hole (231) and the second hole (241) are connected through the cavity (290), and adjacent cavities (290) are connected.

7. The vehicle underframe according to any one of claims 1 to 6, characterized in that One or more wall surfaces of the first crossbeam (200) and the second crossbeam (300) are provided with drainage holes (2010).

8. The vehicle underframe according to claim 7, characterized in that When one or more of the first crossbeam (200) and the second crossbeam (300) have a plurality of cavities (290) arranged in a vertical direction, adjacent cavities (290) are communicated through the drainage holes (2010).

9. A rail vehicle, characterized in that: A vehicle underframe comprising the vehicle underframe according to any one of claims 1 to 8.

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