Straddle-type monorail vehicle roof structure and straddle-type monorail vehicle

Abstract

The utility model provides a straddle type monorail car roof structure and straddle type monorail vehicle relates to rail transit vehicle technical field, and the roof structure includes roof skin subassembly, air conditioning roof subassembly and roof boundary beam, two roof boundary beams are arranged respectively in the both sides edge of roof skin subassembly, air conditioning roof subassembly sets up in the middle part of roof skin subassembly is used for installing air conditioning unit, wherein the side of roof boundary beam is away from roof skin subassembly is configured as with the butt joint surface of lateral joint -welding of vehicle side wall. The utility model discloses through the lateral butt joint surface design of roof boundary beam, makes the roof and side wall can directly weld in the same plane. This structure avoids the positioning deviation problem of riveting technology when lateral butt joint, and the continuous sealing characteristic of weld is also better than discrete rivet connecting mode, realizes the reliable connection of roof and side wall under the lateral butt joint state, and the weld structure not only improves the connecting strength, still guarantees the car body sealing performance through continuous welding interface.

Description

Technical Field

[0001] This utility model relates to the field of rail transit vehicle technology, specifically to a straddle-type monorail roof structure and a straddle-type monorail vehicle. Background Technology

[0002] Straddle-type monorail trains are widely used in urban public transportation due to their advantages such as small footprint, strong climbing ability, and small turning radius. To enhance the passenger sightseeing experience, modern monorail trains tend to use larger side window areas, which requires the side wall structure to extend upwards, fundamentally changing the connection between the roof and the side walls. In traditional steel-aluminum hybrid body structures, the roof usually rests entirely above the side walls and is connected by riveting, a mature technology with reliable sealing.

[0003] However, as the side window area extends towards the roof, the sidewall also extends to the original roof area, changing the traditional "vertical overlap" of the roof and sidewall to a "lateral butt joint." Under this new structural form, the original riveting connection method becomes difficult to implement, and both connection strength and sealing performance are hard to guarantee. Especially at the joint area between the roof edge beam and the sidewall, the traditional structure cannot provide sufficient connection strength and sealing performance, easily leading to stress concentration and potential leakage. These technical challenges severely restrict the realization of vehicle sightseeing design, becoming a technical bottleneck that urgently needs to be solved. Utility Model Content

[0004] The purpose of this utility model is to provide a straddle-type monorail roof structure and a straddle-type monorail vehicle to improve the connection strength and sealing performance between the roof and the side walls.

[0005] To solve the above problems, this utility model provides a straddle-type monorail roof structure and a straddle-type monorail vehicle.

[0006] In the first aspect, this utility model provides a straddle-type monorail roof structure, including a roof skin assembly, an air conditioning roof assembly, and roof side beams; two roof side beams are respectively disposed on the two sides of the roof skin assembly; the air conditioning roof assembly is disposed in the middle of the roof skin assembly and is used to install an air conditioning unit. The side of the roof edge beam away from the roof skin assembly is configured as a mating surface for transverse welding with the vehicle sidewall.

[0007] The beneficial effects of this utility model's straddle-type monorail roof structure are: The roof skin assembly forms an integral load-bearing frame through the side roof beams on both sides. The flat mating surfaces of the roof beams directly contact the end faces of the vehicle's side walls, forming continuous welds through transverse welding. The air conditioning roof assembly is located in the central area of ​​the roof, providing an installation location for the air conditioning equipment and enhancing the roof's rigidity through a longitudinal beam structure. The transverse mating method between the roof beams and the side walls eliminates the lap allowance required by traditional riveting, enabling a reliable connection between the roof and side walls within a limited space. This invention, through the design of the transverse mating surface of the roof beams, allows the roof and side walls to be directly welded on the same plane. This structure avoids the positioning deviation problem of riveting processes during transverse mating, and the continuous sealing characteristics of the weld are superior to discrete riveting connections, achieving a reliable connection between the roof and side walls in a transverse mating state. The weld structure not only improves the connection strength but also ensures the vehicle body's sealing performance through a continuous welding interface. The combined layout of the roof beams and the air conditioning roof assembly, while ensuring structural rigidity, provides a standardized installation interface for the air conditioning equipment, adapting to the structural changes required by the large side window design of modern monorail trains.

[0008] Optionally, the roof side beam is connected to the vehicle side wall via a V-shaped butt weld.

[0009] Optionally, the air conditioner roof assembly includes at least two air conditioner roof longitudinal beams, the upper surface of which is horizontal.

[0010] Optionally, the upper surface of the air conditioner top longitudinal beam is provided with a C-shaped groove for installing the air conditioning unit.

[0011] Optionally, the roof skin assembly includes a first intermediate dome plate and a second intermediate dome plate located in the middle between two roof side beams; the first intermediate dome plate and the second intermediate dome plate are respectively located at both ends of the air conditioning roof assembly; a plurality of first side dome plates are symmetrically arranged on both sides of the first intermediate dome plate between the two roof side beams, and the plurality of first side dome plates are arranged along the interval direction of the two roof side beams; a plurality of second side dome plates are symmetrically arranged on both sides of the second intermediate dome plate between the two roof side beams, and the plurality of second side dome plates are arranged along the interval direction of the two roof side beams; adjacent first side dome plates and adjacent second side dome plates are connected by fillet welds; the first intermediate dome plate and its two adjacent first side dome plates, as well as the second intermediate dome plate and its two adjacent second side dome plates, are connected by V-shaped butt welds.

[0012] Optionally, one end of the first intermediate dome plate and the first side dome plate are connected to the air conditioning roof assembly via a single-sided V-shaped weld; one end of the second intermediate dome plate and the second side dome plate are connected to the air conditioning roof assembly via a single-sided V-shaped weld.

[0013] Optionally, the roof structure also includes end panels, which are connected to both ends of the roof skin assembly by fillet welds.

[0014] Optionally, the roof structure also includes roof panels, with two roof panels located at both ends of two roof side beams, and the roof panels are connected to the ends of the two roof side beams by a single-sided V-shaped weld.

[0015] Optionally, the roof structure also includes roof crossbeams, with multiple roof crossbeams spaced apart along the extension direction of the roof side beams, and the roof crossbeams connected to the roof skin assembly and the roof side beams by fillet welds.

[0016] Secondly, this utility model provides a straddle-type monorail vehicle, including a straddle-type monorail roof structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the roof structure from one perspective in an embodiment of this utility model; Figure 2 This is a schematic diagram of the roof structure from another perspective in an embodiment of this utility model; Figure 3 This is a schematic diagram of the air conditioning roof assembly in the vehicle roof structure of this utility model embodiment; Figure 4 for Figure 1 Top view; Figure 5 for Figure 4 Sectional view of AA; Figure 6 for Figure 4 Sectional view of BB; Explanation of reference numerals in the attached figures: 1. Roof side beam; 2. Roof skin assembly; 21. First intermediate dome plate; 22. First side dome plate; 23. Second intermediate dome plate; 24. Second side dome plate; 3. Air conditioning roof assembly; 31. Air conditioning roof longitudinal beam; 32. Air conditioning roof crossbeam; 33. Air conditioning top plate; 4. Sealing plate; 5. Roof top plate; 6. Roof crossbeam. Detailed Implementation

[0018] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0019] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0020] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0021] like Figure 1-6 As shown in the figure, the present invention provides a straddle-type monorail roof structure, including a roof skin assembly 2, an air conditioning roof assembly 3, and a roof side beam 1; the two roof side beams 1 are respectively disposed on the two side edges of the roof skin assembly 2; the air conditioning roof assembly 3 is disposed in the middle of the roof skin assembly 2 and is used to install an air conditioning unit; the side of the roof side beam 1 away from the roof skin assembly 2 is configured as a butt surface for transverse welding with the vehicle side wall.

[0022] Among them, the roof side beam 1 refers to the load-bearing component extending longitudinally along the roof skin assembly 2, which can be made of high-strength aluminum alloy profiles. Its side away from the skin assembly is milled to form a flat welding surface. The transverse welded butt joint refers to the welding interface set parallel to the end face of the vehicle side wall, which can be achieved using laser welding technology, forming a closed connection through continuous welds. The air conditioning roof assembly 3 refers to the supporting structure for supporting the air conditioning equipment, which can be made of longitudinal beam assembly with mounting grooves. Its placement in the middle can optimize the load distribution of the roof.

[0023] Specifically, the roof skin assembly 2 forms an integral load-bearing frame through the two roof side beams 1. The flat mating surface of the roof side beams 1 directly contacts the end face of the vehicle side wall, forming a continuous weld seam through transverse welding. The air conditioning roof assembly 3 is arranged in the middle area of ​​the roof, providing an installation position for the air conditioning equipment and enhancing the roof rigidity through a longitudinal beam structure. The transverse mating method between the roof side beams 1 and the side wall eliminates the lap allowance required by traditional riveting, enabling a reliable connection between the roof and the side wall within a limited space. In this embodiment, the transverse mating surface design of the roof side beams 1 allows the roof and side wall to be directly welded in the same plane. This structure avoids the positioning deviation problem of riveting process during transverse mating, and the continuous sealing characteristics of the weld seam are also superior to discrete riveting connection methods. A reliable connection between the roof and the side wall is achieved in the transverse mating state. The weld seam structure not only improves the connection strength but also ensures the sealing performance of the vehicle body through the continuous welding interface. The combined layout of the roof side beam 1 and the air conditioning roof component 3 ensures structural rigidity while providing a standardized installation interface for the air conditioning equipment, adapting to the structural changes brought about by the large side window design of modern monorail trains.

[0024] Optionally, the roof side beam 1 is connected to the vehicle side wall via a V-shaped butt weld.

[0025] Among them, V-shaped butt welds refer to welds formed by a V-shaped angle with bevels on the end faces of two welded parts. Specifically, they can be achieved using a double-sided welding process, with the welding angle controlled between 30° and 60°. This weld structure increases the penetration depth, allowing the welding stress to be evenly distributed along the thickness direction, thereby improving the connection strength and adapting to the stress characteristics of transverse butt welding.

[0026] Specifically, during the transverse butt welding of the roof side beam 1 and the vehicle side wall, multi-layer welding is performed along a V-shaped bevel. During welding, the welding torch alternately applies welding along both sides of the bevel, filling the gap with molten metal and forming a continuous weld. After cooling, the weld has a V-shaped cross-section, effectively dispersing the shear stress generated by transverse loads and preventing sealing failure due to incomplete fusion at the weld root. The V-shaped butt weld does not damage the integrity of the base material, achieving a continuous sealing interface through metallurgical bonding. The weld itself serves both connection and sealing functions, making it particularly suitable for transverse butt structures formed after the side wall extension. This solves the problems of insufficient connection strength and poor sealing reliability when the roof and side wall are transversely butt-welded. The weld structure can withstand the dynamic bending stress generated during vehicle operation, while preventing rainwater or dust from seeping into the passenger compartment through the connection gaps, ensuring the long-term safety of the vehicle and passenger comfort.

[0027] Optionally, the air conditioner roof assembly 3 includes at least two air conditioner roof longitudinal beams 31, the upper surface of which is a horizontal plane.

[0028] The air conditioning roof longitudinal beam 31 refers to the supporting component extending longitudinally along the roof of the vehicle. It can be made of aluminum alloy profiles or welded steel structures and is used to bear the weight of the air conditioning unit and distribute the load. The horizontal plane refers to the flat area at the top of the longitudinal beam, which can be achieved through machining or pre-forming of profiles and is used to provide a stable mounting base for the air conditioning unit.

[0029] In a further embodiment, the air conditioning roof assembly 3 shall also include an air conditioning roof crossbeam 32; two air conditioning roof crossbeams 32 and two air conditioning roof longitudinal beams 31 form a rectangular frame; the air conditioning roof crossbeams 32 and air conditioning roof longitudinal beams 31 are connected by V-shaped butt welds and fillet welds. An air conditioning top plate 33 is welded to one side wall of the two air conditioning roof crossbeams near the skin assembly; the air conditioning top plate 33 is used for welding to the skin assembly.

[0030] Specifically, the air conditioning roof longitudinal beam 31 is arranged longitudinally along the center of the roof, with its horizontal upper surface directly contacting the bottom of the air conditioning unit and secured by bolts or clips. The flatness of the horizontal surface avoids stress concentration caused by uneven contact surfaces during installation and facilitates adjustment of the air conditioning unit's position. This structure adapts to the space constraints after the roof and side walls are laterally joined, distributing the load through longitudinal support to prevent deformation of the roof skin due to localized pressure. Furthermore, designing the air conditioning roof longitudinal beam 31 with a completely horizontal upper surface avoids the risk of water accumulation. The pre-installed horizontal longitudinal beam simplifies the installation process and enhances support rigidity, making it particularly suitable for layouts with limited space after the roof and side walls are laterally joined.

[0031] Optionally, the upper surface of the air conditioner top longitudinal beam 31 is provided with a C-shaped groove for installing the air conditioning unit.

[0032] The C-shaped channel refers to a long, C-shaped channel, which can be made of aluminum alloy or stainless steel through extrusion molding. Its opening faces upwards, and the inner wall of the channel forms a continuous guide rail. This structure provides a standardized installation interface for the air conditioning unit, enabling rapid positioning of bolts or clips via the built-in guide rail. The air conditioning roof longitudinal beam 31 is the main load-bearing component supporting the air conditioning unit. It can be made of high-strength steel plate through stamping and welding to form a box-section beam, with its horizontal upper surface providing an installation reference surface for the air conditioning unit. This structure ensures the overall rigidity of the roof by bearing the weight of the air conditioning unit and transferring the load to the roof side beam 1.

[0033] Specifically, two parallel air conditioning roof longitudinal beams 31 are installed in the middle of the roof skin assembly 2, with C-shaped grooves machined on the upper surface of the beams extending along their length. The mounting feet at the bottom of the air conditioning unit can be laterally limited by T-bolts embedded in the C-shaped grooves, and then longitudinally fixed with clamping nuts. This installation method allows the weight of the air conditioning unit to be directly transferred to the roof side beam 1 through the longitudinal beams, avoiding load concentration in the skin area.

[0034] Optionally, the roof skin assembly 2 includes a first intermediate dome plate 21 and a second intermediate dome plate 23 located in the middle of the two roof side beams 1, with the first intermediate dome plate 21 and the second intermediate dome plate 23 located at both ends of the air conditioning roof assembly 3. Multiple first side dome plates 22 are symmetrically arranged on both sides of the first intermediate dome plate 21 between the two roof side beams 1, and multiple second side dome plates 24 are symmetrically arranged on both sides of the second intermediate dome plate 23 between the two roof side beams 1. Adjacent first side dome plates 22 and adjacent second side dome plates 24 are connected by fillet welds, and the first intermediate dome plate 21 is connected to adjacent first side dome plates 22, and the second intermediate dome plate 23 is connected to adjacent second side dome plates 24 by V-shaped butt welds.

[0035] The central dome plate refers to the arc-shaped sheet located in the middle of the roof skin assembly 2 and connected to the end of the air conditioning roof assembly 3. It can be made of extruded aluminum alloy profiles and is used to construct the central support structure of the roof. The side dome plates refer to the arc-shaped sheets symmetrically distributed on both sides of the central dome plate. They can be made of the same corrugated sheet material as the central dome plate, and are arranged in segments to form the transition area of ​​the roof's curved surface. Fillet welds refer to right-angle welded connections formed along the edges of the sheet metal. They can be implemented using gas metal arc welding (GMAW) to achieve a continuous, sealed connection between adjacent side dome plates. V-shaped butt welds refer to linear welds with a bevel design. They can be implemented using a double-sided welding process to ensure the structural strength between the central dome plate and the side dome plates.

[0036] Specifically, the roof skin assembly 2 forms a continuous curved surface through a combination of a central dome plate and side dome plates. The central dome plate, as the main load-bearing component, is connected at its ends to the air conditioning roof assembly 3, while the side dome plates are symmetrically distributed to fill the space between the central dome plate and the roof side beam 1. Adjacent side dome plates are joined at the edges using fillet welds to form a continuous sealed interface. The central dome plate and the side dome plates are connected by beveled V-shaped butt welds to ensure the structural integrity of the connection area. This split design allows for reliable connections between components while ensuring a smooth transition of the roof surface.

[0037] Compared to existing technologies, traditional roof panels often employ integral molding or simple modular splicing, which can easily lead to insufficient connection strength when the roof and side walls are changed to a horizontal butt joint. This embodiment utilizes a combined layout of a central dome plate and side dome plates, along with a composite connection method of V-shaped butt welds and fillet welds. This adapts to the curved surface characteristics of the roof structure while ensuring connection reliability under horizontal butt joint conditions. Compared to traditional riveting processes, welding connections are more suitable for the sealing requirements of horizontally butt joint structures.

[0038] Optionally, one end of the first intermediate dome plate 21 and the first side dome plate 22 are connected to the air conditioning roof assembly 3 by a single-sided V-shaped weld; one end of the second intermediate dome plate 23 and the second side dome plate 24 are connected to the air conditioning roof assembly 3 by a single-sided V-shaped weld.

[0039] Among them, the single-sided V-shaped weld connection refers to a V-shaped groove weld that is welded only on one side. Specifically, it can be achieved using a single-sided welding process and is suitable for butt joints where double-sided welding is not possible. A reliable connection is formed through single-sided penetration. The connection between the middle dome plate and the side dome plates and the air conditioning roof assembly 3 refers to the transition area between the roof skin assembly 2 and the air conditioning roof assembly 3. Specifically, it can be achieved using sheet metal bending or stamping to ensure the continuity and sealing of the roof structure.

[0040] Specifically, at the connection between the roof skin assembly 2 and the air conditioning roof assembly 3, one end of the central dome plate and the side dome plates are connected to the air conditioning roof assembly 3 via a single-sided V-shaped weld. This welding method allows welding to be completed on one side, adapting to the space constraints of the roof structure while ensuring the strength and sealing of the connection. The V-groove design of the weld helps to improve the penetration depth and weld quality, ensuring a reliable connection between the various roof components.

[0041] Optionally, the roof structure includes a sealing plate 4, which is connected to both ends of the roof skin assembly 2 by fillet welds.

[0042] The sealing plate 4 refers to the plate-like structure covering the end of the roof skin assembly 2. It can be made of aluminum alloy or steel sheet by stamping. It is used to seal the end openings of the roof skin assembly 2 and the air conditioning roof assembly 3 to prevent moisture or impurities from the external environment from entering the vehicle body. The fillet weld connection refers to the L-shaped weld formed at the contact edge between the sealing plate 4 and the roof skin assembly 2 through a welding process. It can be achieved by continuous welding or intermittent welding to ensure the structural continuity and sealing between the sealing plate 4 and adjacent components.

[0043] Specifically, the sealing plate 4 is positioned at both ends of the roof skin assembly 2 and is fixedly connected to both via fillet welds. The ends of the roof skin assembly 2 are typically curved transition areas. The sealing plate 4, by covering the end openings in these areas, effectively prevents rainwater or dust from entering the vehicle interior. Furthermore, as a transition structure, the sealing plate 4 can also cooperate with the roof top panel 5 or other components to further strengthen the support of the roof edge. In this embodiment, the sealing plate 4, connected by fillet welds, achieves both physical closure of the end openings and enhanced connection strength through welding, avoiding the limitations of traditional riveting methods in lateral connection scenarios. This solves the sealing and structural strength problems at the end connection between the roof skin assembly 2 and the air conditioning roof assembly 3, preventing the risk of water leakage or corrosion caused by end openings, while improving the reliability and service life of the overall roof structure, adapting to the new vehicle design requirements of lateral connections between the sidewalls and the roof.

[0044] Optionally, it also includes a roof panel 5, which is connected to the roof side beam 1 via a single-sided V-shaped weld. The roof panel 5 refers to the closed component located at the end of the roof structure. It can be made by stamping metal sheet and serves to close the end opening of the roof side beam 1 to form a complete closed structure, while also providing auxiliary support for the lateral connection between the roof and the side wall. The single-sided V-weld refers to a welding method where a V-shaped bevel is opened only on one side. This can be achieved by pre-processing a single-sided bevel on the edge of the roof panel 5 or the roof side beam 1. This design allows for high-strength welding within a limited space while avoiding the operational space limitations required for double-sided welding.

[0045] Specifically, the roof panel 5 is positioned at the end of the roof side beam 1 and is continuously welded to the side wall of the roof side beam 1 via a single-sided V-shaped weld. During welding, the welding torch moves along the V-shaped groove trajectory, and molten metal fills the groove gap to form a dense weld. Because the roof panel 5 and the end of the roof side beam 1 form a closed structure, this design prevents external environmental media from seeping into the vehicle body through the end gap, while also enhancing the deformation resistance of the end of the roof side beam 1.

[0046] Optionally, the straddle-type monorail roof structure also includes roof crossbeams 6, and multiple roof crossbeams 6 are connected to the roof skin assembly 2 and the roof side beams 1 by fillet welds.

[0047] The roof crossbeam 6 refers to the supporting component arranged laterally between the roof skin assembly 2 and the roof side beam 1. It can be implemented using a rectangular or I-shaped metal profile to enhance the lateral stiffness and load-bearing capacity of the roof structure. The fillet weld refers to the right-angle weld formed at the joint of two metal components. It can be implemented using a continuous welding process. By forming continuous fillet welds between the two ends of the roof crossbeam 6 and the roof skin assembly 2 and the roof side beam 1, structural strength and sealing performance can be improved.

[0048] Specifically, the roof crossbeams 6 are spaced apart along the length of the roof skin assembly 2, with their ends contacting the inner surface of the roof side beams 1 and the lower surface of the roof skin assembly 2, respectively. The upper and lower flanges of the roof crossbeams 6 are welded to the steel plate edge of the roof skin assembly 2 and the web of the roof side beams 1 via fillet welds, forming continuous triangular cross-section welds. This arrangement allows the roof crossbeams 6 to convert the longitudinal load borne by the roof skin assembly 2 into a lateral distributed force, which is then transferred to the vehicle sidewall structure via the roof side beams 1, effectively dispersing the impact of concentrated loads on the welded joints. The fillet weld connection scheme for the roof crossbeams 6 not only adapts to the lateral connection between the roof and the sidewalls but also avoids stress concentration problems caused by rivet holes due to the continuity of the welds. Compared to point-connected rivets, the closed connection interface formed by continuous fillet welds is more conducive to maintaining the overall airtightness of the roof structure. The technical problem of insufficient connection strength when the roof and side wall are laterally joined has been solved. Through the design of the roof beam 6 and the fillet weld, the continuous sealing of the connection interface is achieved while ensuring structural rigidity. This avoids the failure risk of traditional riveting process in the laterally joined scenario and improves the reliability of the roof structure under complex load conditions.

[0049] This utility model provides a straddle-type monorail vehicle, including the straddle-type monorail roof structure described above.

[0050] The beneficial effects of the straddle-type monorail vehicle in this embodiment compared to the prior art are the same as those of the straddle-type monorail roof structure described above, and will not be repeated here.

[0051] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A straddle-type monorail roof structure, characterized in that, It includes a roof skin assembly (2), an air conditioning roof assembly (3), and a roof side beam (1); the two roof side beams (1) are respectively disposed on the two sides of the roof skin assembly (2); the air conditioning roof assembly (3) is disposed in the middle of the roof skin assembly (2) and is used to install an air conditioning unit; The side of the roof side beam (1) away from the roof skin assembly (2) is configured as a mating surface for transverse welding with the vehicle side wall.

2. The straddle-type monorail roof structure according to claim 1, characterized in that, The roof side beam (1) is connected to the vehicle side wall by a V-shaped butt weld.

3. The straddle-type monorail roof structure according to claim 1, characterized in that, The air conditioner top assembly (3) includes at least two air conditioner top longitudinal beams (31), the upper surface of which is a horizontal plane.

4. The straddle-type monorail roof structure according to claim 3, characterized in that, The upper surface of the air conditioner top longitudinal beam (31) is provided with a C-shaped groove, which is used to install the air conditioner unit.

5. The straddle-type monorail roof structure according to claim 1, characterized in that, The roof skin assembly (2) includes a first intermediate dome plate (21) and a second intermediate dome plate (23) located in the middle between the two roof side beams (1); the first intermediate dome plate (21) and the second intermediate dome plate (23) are respectively located at both ends of the air conditioning roof assembly (3); a plurality of first side dome plates (22) are symmetrically arranged on both sides of the first intermediate dome plate (21) between the two roof side beams (1), and the plurality of first side dome plates (22) are arranged along the interval direction of the two roof side beams (1); the second intermediate dome plate (23) Multiple second side dome plates (24) are symmetrically arranged between the two sides and the two roof side beams (1). The multiple second side dome plates (24) are arranged along the interval direction of the two roof side beams (1). The two adjacent first side dome plates (22) and the two adjacent second side dome plates (24) are connected by fillet welds. The first intermediate dome plate (21) and its two adjacent first side dome plates (22), and the second intermediate dome plate (23) and its two adjacent second side dome plates (24) are connected by V-shaped butt welds.

6. The straddle-type monorail roof structure according to claim 5, characterized in that, One end of the first intermediate dome plate (21) and the first side dome plate (22) are connected to the air conditioning top assembly (3) by a single-sided V-shaped weld; one end of the second intermediate dome plate (23) and the second side dome plate (24) are connected to the air conditioning top assembly (3) by a single-sided V-shaped weld.

7. The straddle-type monorail roof structure according to claim 1, characterized in that, It also includes a sealing plate (4), which is connected to both ends of the roof skin assembly (2) by fillet welds.

8. The straddle-type monorail roof structure according to claim 7, characterized in that, It also includes roof panels (5), two roof panels (5) are located at the two ends of the two roof side beams (1), and the roof panels (5) are connected to the ends of the two roof side beams (1) by a single-sided V-shaped weld.

9. The straddle-type monorail roof structure according to any one of claims 1 to 8, characterized in that, It also includes roof crossbeams (6), a plurality of roof crossbeams (6) are spaced apart along the extension direction of the roof side beams (1), and the roof crossbeams (6) are connected to the roof skin assembly (2) and the two roof side beams (1) by fillet welds.

10. A straddle-type monorail vehicle, characterized in that, Including the straddle-type monorail roof structure as described in any one of claims 1 to 9.

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