Integrally cast two-wheeled vehicle body

Abstract

The integrally cast two-wheeled vehicle body is characterized in that the integrally cast two-wheeled vehicle body comprises a vehicle head assembly, a vehicle seat assembly and a pedal assembly, and the vehicle head assembly, the vehicle seat assembly and the pedal assembly are integrally cast and formed; the vehicle head assembly comprises a vehicle head shell, and the vehicle head shell is vertically arranged in a barrel shape and defines a first cavity. The saddle assembly comprises a saddle shell, the saddle shell is vertically arranged in a barrel shape, and a second cavity is defined by the saddle shell; the pedal assembly comprises a pedal shell; the pedal shell is horizontally arranged in a barrel shape and defines a third cavity; the bicycle body is in a U shape, the bicycle head assembly and the bicycle seat assembly are arranged in a front-back spaced mode, the pedal assembly is arranged on the lower side of the bicycle head assembly and the lower side of the bicycle seat assembly, the front end of the pedal shell is connected with the lower end of the bicycle head shell, and the rear end of the pedal shell is connected with the lower end of the bicycle seat shell. And the third cavity is communicated with the first cavity and the second cavity, so that the whole inner cavity of the vehicle body is also U-shaped.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric bicycles, in particular to an integrally cast two-wheeled vehicle body. BACKGROUND

[0002] As a short-distance convenient travel tool, electric bicycles have been widely used in people's daily travel. The frame of an electric bicycle, as the core load-bearing component of the whole vehicle, not only needs to meet the requirements of structural strength and lightweight, but also needs to comply with relevant national regulations and standards.

[0003] The existing electric bicycle frame generally adopts the structure disclosed in the utility model patent with the announcement number CN220924408U and the name of an electric bicycle frame structure, that is, a plurality of independent steel pipes are sequentially connected and formed through a welding process. This type of frame has significant technical defects in the production process: on the one hand, the processing procedures are complicated, each steel pipe needs to be cut and bent to meet the configuration requirements, and then positioned and welded for assembly, and subsequent processes such as polishing and rust prevention treatment of the welded joints are required. Not only is the production efficiency low, but the stress concentration is easy to occur at the multiple welded joints, which leads to unstable overall structural strength of the frame, deformation or even cracking risk at the welded joints, and affects the riding safety. On the other hand, in order to realize the appearance beautification and local protection function, the welded frame needs to be additionally installed with a plastic shell outside after being formed. The assembly of the plastic shell needs to be separately designed with a positioning structure and connected with fasteners, which further increases the production procedures, and the assembly precision of the frame and the plastic shell is difficult to accurately control, which is easy to cause gaps and misalignment, and the appearance quality stability is poor. At the same time, the plastic shell is easy to loosen and fall off due to vibration and aging in long-term use, and the maintenance cost is high.

[0004] In addition, the national requirements for the safety, environmental protection and compliance of electric bicycles are continuously upgraded. The new national standard clearly proposes stricter restrictions on the quality proportion of plastic parts and the fire-retardant performance of the material. The existing frame structure represented by CN220924408U cannot meet the restriction requirements of the new national standard, and a new type of frame production process is urgently needed to break through the above technical bottlenecks. SUMMARY

[0005] In order to overcome at least one of the above problems of the prior art electric bicycle frame, the present application proposes an integrally cast two-wheeled vehicle body, which comprises a head assembly, a seat assembly and a pedal assembly, and the head assembly, the seat assembly and the pedal assembly are integrally cast; the head assembly comprises a head shell, which is arranged vertically in a barrel shape and defines a first cavity; the seat assembly comprises a seat shell, which is arranged vertically in a barrel shape and defines a second cavity; the pedal assembly comprises a pedal shell, which is arranged horizontally in a barrel shape and defines a third cavity; the vehicle body is in a U shape, wherein the head assembly and the seat assembly are arranged in front and back, and the pedal assembly is arranged on the lower side of the head assembly and the seat assembly, the front end of the pedal shell is connected to the lower end of the head shell, the rear end of the pedal shell is connected to the lower end of the seat shell, and the third cavity is communicated with the first cavity and the second cavity so that the inner cavity of the vehicle body is also in a U shape.

[0006] Among them, the head assembly, the seat assembly and the pedal assembly are three main components of the vehicle body, which are distinguished according to their layout positions and functions, and the three components are not only connected, but also integrally cast, that is, the three components do not need additional parts for connection and fixation. In addition, in order to ensure the rigidity and structural strength of the vehicle body, the vehicle body is generally cast from aluminum alloy, magnesium alloy or zinc alloy material.

[0007] Among them, the head assembly, the seat assembly and the pedal assembly are hollow barrel structures, which include but are not limited to circular barrel, rectangular barrel or other irregular barrel, that is, the shell of the three components is surrounded by one or more wall bodies, which not only plays a supporting role, but also can be used as an appearance wall; in addition, the hollow vehicle body structure can also be used as a placing space for other components.

[0008] Among them, the vehicle body is in a U shape, which refers to the overall structure shape of the head assembly, the seat assembly and the pedal assembly, the head assembly is located at the front for installing handlebars, the seat assembly is arranged at the rear for installing the seat, the hollow seat assembly is used for placing batteries or personal items, the leg placing space is left between the head assembly and the seat assembly, and the pedal assembly is arranged at the bottom of the leg placing space for placing feet.

[0009] Among them, the third cavity is communicated with the first cavity and the second cavity, which means that the head shell, the pedal shell and the seat shell are not only connected together, but also the three cavities defined by the shells are also communicated, so that the interfaces of the mutual connection of the three shells are also in a frame shape, which is equivalent to increasing the connection length of the wall body and improving the structural strength of the connection.

[0010] According to the technical scheme, compared with the prior art, the beneficial technical effects of the application are as follows: first, the integrally cast vehicle body can reduce the welding and mounting processes, greatly improve the processing production efficiency, and effectively reduce the production cost; second, the integrally cast vehicle body is made of metal material, which solves the problem of stress concentration caused by poor welding processing, in addition, the U-shaped hollow structure of the vehicle body makes the whole vehicle body have excellent structural strength, ensuring the safety of riding; third, the cast vehicle head shell, pedal shell and seat shell directly serve as the appearance surface components, the surface processing is convenient, the adhesion is good, and the structural strength is high, which can well protect the battery and control components in the vehicle, reduce the risk of internal component spontaneous combustion caused by collision deformation; fourth, the vehicle body is made of metal material, which not only has excellent flame retardant performance, but also reduces the generation of toxic gas when the vehicle burns.

[0011] Due to the above characteristics and advantages of the application, it can be applied to the integrally cast vehicle body of the two-wheeled vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a schematic view of the structure of the vehicle body in the axial direction, showing the upper structure; Figure 2 is a schematic view of the structure of the vehicle body in the axial direction, showing the bottom structure; Figure 3 is a schematic view of the cross-sectional structure of the vehicle body; Figure 4 is a schematic view of the structure of the vehicle head assembly; Figure 5 is a schematic view of the structure of the vehicle seat assembly; Figure 6 is a schematic view of the structure of the pedal assembly. DETAILED DESCRIPTION

[0013] The structure of the integrally cast vehicle body of the two-wheeled vehicle using the technical scheme of the application will be further described below in conjunction with the drawings.

[0014] Except for the explicitly stated equivalent or alternative embodiments, the various embodiments disclosed below can be selectively applied or combined in one embodiment even if there is no direct functional relationship or synergy.

[0015] As Figures 1-6As shown, it is a two-wheeled vehicle body integrally cast, which comprises a head assembly 1, a seat assembly 2 and a pedal assembly 3, and the head assembly 1, the seat assembly 2 and the pedal assembly 3 are integrally cast; the head assembly 1 comprises a head shell 11, which is arranged vertically in a barrel shape and defines a first cavity 10; the seat assembly 2 comprises a seat shell 21, which is arranged vertically in a barrel shape and defines a second cavity 20; the pedal assembly 3 comprises a pedal shell 31, which is arranged horizontally in a barrel shape and defines a third cavity 30; the vehicle body is in a U shape, wherein the head assembly 1 and the seat assembly 2 are arranged in front and back, and the pedal assembly 3 is arranged on the lower side of the head assembly 1 and the seat assembly 2, the front end of the pedal shell 31 is connected to the lower end of the head shell 11, the rear end of the pedal shell 31 is connected to the lower end of the seat shell 21, and the third cavity 30 is communicated with the first cavity 10 and the second cavity 20, so that the inner cavity of the vehicle body is also in a U shape.

[0016] The head assembly 1, the seat assembly 2 and the pedal assembly 3 are three main components of the vehicle body, which are distinguished according to their layout positions and functions, wherein the part for installing handlebars on the front side is the head assembly 1, the part for installing the seat and placing the battery on the rear side is the seat assembly 2, and the pedal assembly 3 arranged between the head assembly 1 and the seat assembly 2 is used to connect the other two assemblies and facilitate foot placement. In this technical solution, the three assemblies are not only connected, but also integrally cast, that is, the three assemblies do not need additional parts for connection and fixation or welding. Compared with the prior art, this technical solution does not need pipe cutting and welding, and also does not need pipe installation process, which greatly improves the processing and production efficiency of the vehicle body, and effectively reduces the production cost.

[0017] In order to ensure the rigidity and structural strength of the vehicle body, the vehicle body is generally made of aluminum alloy, magnesium alloy or zinc alloy material. The integrally cast vehicle body well solves the problem of too many welding processing procedures and stress concentration caused by poor welding.

[0018] In addition, the head assembly 1, the seat assembly 2 and the pedal assembly 3 are all hollow barrel structures, which include but are not limited to circular barrel, rectangular barrel or other irregular barrel, that is, the shells of the three assemblies are generally surrounded by multiple walls. Figure 1 With Figure 2As shown, the head shell 11 of the head assembly 1 is bent, and the corner is obtuse to enhance the modeling beauty of the head. The head shell 11 comprises a head front shell 111, a head rear shell 112, a head left shell 113, a head right shell 114 and a head upper shell 115. The seat shell 21 of the seat assembly 2 is rectangular barrel-shaped with a large upper part and a small lower part. The seat shell 21 comprises a seat front shell 211, a seat rear shell 212, a seat left shell 213 and a seat right shell 214. The lower half of the seat rear shell 212 is arranged from back to front to provide space for the installation of the rear wheel. The pedal shell 31 of the pedal assembly 3 is rectangular barrel-shaped and arranged in a transverse extension. The pedal shell 31 comprises a pedal upper wall 311, a pedal lower wall 312, a pedal left wall 313 and a pedal right wall 314.

[0019] The U-shaped body refers to the overall structure shape of the head assembly 1, the seat assembly 2 and the pedal assembly 3. The head assembly 1 is located at the front for the installation of the handlebar. The seat assembly 2 is arranged at the rear for the installation of the seat. The hollow seat assembly 2 is used for placing a battery or personal items. The head assembly 1 and the seat assembly 2 are arranged in front and back, and a leg placing space is left between them. The pedal assembly 3 is arranged at the bottom of the leg placing space for the placement of feet.

[0020] In addition, the third chamber 30 is communicated with the first chamber 10 and the second chamber 20, which means that the head shell 11, the pedal shell 31 and the seat shell 21 are not only connected together, but also the three chambers defined by the shells are also communicated. The interfaces of the mutual connections of the three shells are frame-shaped, which is equivalent to increasing the connection length of the wall body and is beneficial to improve the structural strength of the connection. The U-shaped hollow structure of the body has multiple benefits. First, the overall body has excellent structural strength and rigidity, which guarantees the safety of riding. Second, the head shell 11, the pedal shell 31 and the seat shell 21 are directly used as surface components, which are convenient for surface processing and have good force. Third, the shell structure has high strength, which can well protect the battery and control components inside the vehicle and reduce the risk of internal component combustion caused by deformation due to collision. Fourth, the body is made of metal material, which not only has excellent flame retardant performance, but also reduces the generation of toxic gases when the vehicle burns.

[0021] In order to further strengthen the structural strength of the vehicle body, the vehicle body further comprises at least one main support 4, which is arranged in the first chamber 10, the second chamber 20 and the third chamber 30 in the front-rear direction in a U-shaped manner, and connects the vehicle head shell 11, the pedal shell 31 and the seat shell 21 so as to strengthen the connection strength of the vehicle head assembly 1, the seat assembly 2 and the pedal assembly 3. In the embodiment, the number of the main supports 4 is two, which are arranged at intervals left and right, and the main supports 4 are connected to the vehicle head rear shell 112, the pedal upper wall 311 and the seat front wall 211 respectively.

[0022] In order to form a hollow shell structure of the vehicle body, generally, a sand core needs to be installed in a sand mold before casting the vehicle body. If a single structure sand core is made, due to the large size and weight, the difficulty of making and installing is relatively large, the positioning of the sand core cannot be guaranteed, and the cast vehicle body is prone to uneven thickness and flash. In order to solve this problem, the technical scheme divides the integral sand core into three. For this purpose, the vehicle body further comprises a first partition plate 51 and a second partition plate 52. The first partition plate 51 is arranged at the connection between the pedal assembly 3 and the vehicle head assembly 1, and is used to separate the first chamber 10 and the third chamber 30. The second partition plate 52 is arranged at the connection between the pedal assembly 3 and the seat assembly 2, and is used to separate the second chamber 20 and the third chamber 30. The first partition plate 51 and the second partition plate 52 are essentially formed by the gaps between the three sand cores. By arranging the first partition plate 51 and the second partition plate 52, the size of the sand core can be reduced, and at the same time, the structural strength of the connection between the components can be increased.

[0023] Further, the first partition plate 51 is provided with a first communication hole 510, and the first chamber 10 and the third chamber 30 are communicated through the first communication hole 510. The second partition plate 52 is provided with a second communication hole 520, and the second chamber 20 and the third chamber 30 are communicated through the second communication hole 520. By arranging the first communication hole 510 and the second communication hole 520, it is convenient to install the pipeline in the later stage, and the adjacent two sand cores of the casting mold form local connection and positioning, which is beneficial to guarantee the installation stability of the sand core.

[0024] As Figure 2As shown, the vehicle body further comprises a first auxiliary support 61 and a third auxiliary support 62, the first auxiliary support 61 is arranged in the first cavity 10 to connect the head cover 11 and the main support 4, the third auxiliary support 62 is arranged in the third cavity 30 to connect the pedal cover 31 and the main support 4, the first auxiliary support 61 and the third auxiliary support 62 extend along the left-right direction and are perpendicular to the extending arrangement direction of the main support 4. By arranging the first auxiliary support 61 and the third auxiliary support 62, the structural strength of the head cover 11 and the pedal cover 31 can be further improved.

[0025] As shown in the figure, Figure 4 As shown, the head cover 11 comprises a head upper shell 115, an intermediate partition plate 116, a head front shell 111 and a head rear shell 112, the intermediate partition plate 116 is horizontally arranged in the middle region of the first cavity 10; the head cover 11 further comprises a steering support 12, the steering support 12 comprises a hollow steering shaft cylinder 121, the steering shaft cylinder 121 is arranged in the first cavity 10, the intermediate partition plate 116 is provided with a partition plate through hole 1160, the lower end of the steering shaft cylinder 121 is connected with the intermediate partition plate 116 and communicates with the partition plate through hole 1160, the head upper shell 115 is provided with an upper through hole 1150, the upper end of the steering shaft cylinder 121 is arranged in space with the head upper shell 115, the upper through hole 1150, the steering shaft cylinder 121 and the partition plate through hole 1160 are coaxially arranged, and the head cover 11 and the steering support 12 are integrally formed by casting.

[0026] The intermediate partition plate 116 is horizontally arranged in the middle region of the first cavity 10, and the intermediate partition plate 116 is connected with one or more of the left shell 113, the right shell 114, the head front shell 111 and the head rear shell 112, so as to ensure the structural strength of the intermediate partition plate 116, and the intermediate partition plate 116 also strengthens the overall structural strength of the head cover 11.

[0027] The lower end of the steering shaft cylinder 121 is connected with the intermediate partition plate 116, but the upper end is arranged in space with the head upper shell 115, so that the steering shaft cylinder 121 is supported by the intermediate partition plate 116, and since the intermediate partition plate 116 is a non-external part, the influence of the steering shaft cylinder 121 on the appearance of the head cover 11 is reduced; on the other hand, the steering shaft cylinder 121 is arranged in space with the head upper shell 115, so as to leave space for the subsequent installation and adjustment of the front fork.

[0028] Further, the steering support 12 further comprises an upper support frame 122 connected to the upper end of the steering shaft cylinder 121, the upper support frame 122 comprises a first upper connecting arm 1221 extending along the front-rear direction, the front-rear two ends of the first upper connecting arm 1221 are connected to the front head shell 111 and the rear head shell 112 respectively. Of course, the arrangement of the upper support frame 122 is flexible, the upper support frame 122 comprises a second upper connecting arm (not shown in the figure) extending along the left-right direction, the left-right two ends of the second upper connecting arm are connected to the left shell 113 and the right shell 114 respectively. By arranging the upper support frame 122, the upper end of the suspended steering shaft cylinder 121 is stably supported, the stability of the steering shaft cylinder 121 is ensured, and the structural strength of the head shell 11 is also improved.

[0029] Further, the steering support 12 further comprises an upper support frame 122 connected to the upper end of the steering shaft cylinder 121, the upper support frame 122 comprises a first upper connecting arm 1221 extending along the front-rear direction, the front-rear two ends of the first upper connecting arm 1221 are connected to the front head shell 111 and the rear head shell 112 respectively. Of course, the arrangement of the upper support frame 122 is flexible, the upper support frame 122 comprises a second upper connecting arm (not shown in the figure) extending along the left-right direction, the left-right two ends of the second upper connecting arm are connected to the left shell 113 and the right shell 114 respectively. By arranging the upper support frame 122, the upper end of the suspended steering shaft cylinder 121 is stably supported, the stability of the steering shaft cylinder 121 is ensured, and the structural strength of the head shell 11 is also improved.

[0030] As Figure 5As shown, the seat shell 21 comprises a seat front shell 211, a seat rear shell 212, a seat left shell 213 and a seat right shell 214, the upper and lower edges of the seat front shell 211, the seat rear shell 212, the seat left shell 213 and the seat right shell 214 form an upper opening 215 and a lower opening 216 respectively, which are communicated with the second cavity 20; the seat shell 21 further comprises a seat support 7, which is arranged in the second cavity 20, the seat support 7 comprises an upper support plate 71 and a lower support plate 72, the upper support plate 71 is arranged at the upper opening 215, and the lower support plate 72 is arranged at the lower opening 216; the seat support 7 further comprises a left support rod 73, a right support rod (not shown in the figure) and a transverse support rod 74, the left support rod 73 is connected to the inner side wall of the seat left shell 213 and extends in the up-down direction, the right support rod is connected to the inner side wall of the seat right shell 214 and extends in the up-down direction, and the lower ends of the left support rod 73 and the right support rod are connected to the lower support plate 72; the transverse support rod 74 is arranged in a U shape, and is connected to the inner side walls of the seat front shell 211, the seat left shell 213 and the seat right shell 214 of the seat shell 21, the two free ends of the transverse support rod 74 are connected to the upper ends of the left support rod 73 and the right support rod respectively, and the seat shell 21 and the seat support 7 are integrally cast.

[0031] The seat shell 21 is vertically barrel-shaped and has openings arranged in the up-down direction, the upper opening 215 is larger than the lower opening 216, and the seat shell 21 is inverted triangular when viewed from left to right, which can increase the seating area and provide space for installing wheels. In addition, the seat front shell 211, the seat rear shell 212, the seat left shell 213 and the seat right shell 214 not only form storage cavities, but also serve as appearance components, that is, the single seat shell 21 directly replaces the frame, the inner frame and the decorative plate in the prior art.

[0032] The upper support plate 71 is arranged at the upper opening 215, and the lower support plate 72 is arranged at the lower opening 216, which is beneficial to provide transverse support for the opening structure and improve the structural strength of the upper and lower ends of the seat shell 21, and also facilitates the installation and connection of the seat later.

[0033] The left support rod 73, the right support rod and the transverse support rod 74 are three support members connected together, the left support rod 73 and the right support rod are arranged in the up-down direction, and the transverse support rod 74 is arranged transversely, the two ends of the U-shaped transverse support rod 74 are connected to the upper end portions of the left support rod 73 and the right support rod respectively, and the three support rods form a frame-shaped structure, thereby providing the vehicle seat shell 21 with up-down direction and radial support, which is beneficial to improve the structural strength of the vehicle seat shell 21 in the up-down direction, and improve the radial structural strength of the vehicle seat front shell body 211, the vehicle seat left shell body 213 and the vehicle seat right shell body 214 of the vehicle seat shell 21, and enhance the structural strength and impact resistance of the integrally formed vehicle seat assembly 2, thereby greatly improving the safety of the vehicle body.

[0034] Further, the main support 4 arranged in the second cavity 20 extends up and down and is connected to the inner side wall of the vehicle seat front shell body 211, and the main support 4 is connected with the lower support plate 72 and the transverse support rod 74. By connecting the main support 4 with the lower support plate 72 and the transverse support rod 74, the front part of the inner frame of the vehicle seat shell 21 is also connected, which can further enhance the structural strength of the vehicle seat shell.

[0035] Further, the edge of the upper opening 215 of the vehicle seat shell 21 is provided with a closing flange 22, the closing flange 22 includes a first inner flange 221 extending inward from the upper side edge of the vehicle seat front shell body 211, the vehicle seat rear shell body 212, the vehicle seat left shell body 213 and the vehicle seat right shell body 214, and the inner edge of the first inner flange 221 is provided with a second inner flange 222 extending upward. By arranging the closing flange 22 structure, it is beneficial to further enhance the structural strength of the upper opening 215 of the vehicle seat shell 21, and provide better support for subsequent installation of the vehicle seat.

[0036] Further, the upper part of the vehicle seat rear shell body 212 is provided with a reinforcing groove 23. The reinforcing groove 23 not only enhances the structural strength of the vehicle seat rear shell body 212, but also facilitates the subsequent installation of the tail lamp.

[0037] Further, the lower half of the vehicle seat rear shell body 212 extends from the rear upper part to the front lower part to form an inclined baffle plate 2121, and the inclined baffle plate 2121 is provided with an inclined through hole. The advantage of such arrangement is to provide space for subsequent installation of the rear wheel, while enhancing the aesthetic appearance of the tail part of the vehicle body.

[0038] Further, the vehicle body further comprises a plurality of auxiliary positioning holes 8, which are arranged on the left and right sides of the head cover 11, the seat cover 21 and the pedal cover 31. In this embodiment, the auxiliary positioning holes 8 are arranged on the left head cover 113, the right head cover 114, the left seat wall 213, the right seat wall 214, the left pedal wall 313 and the right pedal wall 314. The auxiliary positioning holes 8 can facilitate the subsequent installation and positioning of the cover decoration.

Claims

1. A two-wheeled vehicle body cast in one piece, characterized in that, The vehicle includes a front end assembly, a seat assembly, and a pedal assembly, all integrally cast. The front end assembly includes a front end shell, which is cylindrical and vertically arranged, defining a first chamber. The seat assembly includes a seat shell, which is cylindrical and vertically arranged, defining a second chamber. The pedal assembly includes a pedal shell, which is cylindrical and horizontally arranged, defining a third chamber. The vehicle body is U-shaped, with the front end assembly and seat assembly spaced apart. The pedal assembly is located below the front end assembly and seat assembly. The front end of the pedal shell is connected to the lower end of the front end shell, and the rear end of the pedal shell is connected to the lower end of the seat shell. The third chamber connects the first and second chambers, thus making the overall internal cavity of the vehicle body U-shaped.

2. The one-piece cast two-wheeled vehicle body according to claim 1, characterized in that, It also includes at least one main support, which is U-shaped and extends through the first chamber, the second chamber and the third chamber. The main support connects the front end shell, the pedal shell and the seat shell to strengthen the connection strength of the front end assembly, the seat assembly and the pedal assembly.

3. The one-piece cast two-wheeled vehicle body according to claim 2, characterized in that, It also includes a first partition plate and a second partition plate. The first partition plate is arranged at the connection between the pedal assembly and the front assembly to separate the first chamber and the third chamber. The second partition plate is arranged at the connection between the pedal assembly and the seat assembly to separate the second chamber and the third chamber.

4. The one-piece cast two-wheeled vehicle body according to claim 3, characterized in that, The first partition plate is provided with a first connecting hole, through which the first chamber and the third chamber are connected; the second partition plate is provided with a second connecting hole, through which the second chamber and the third chamber are connected.

5. The one-piece cast two-wheeled vehicle body according to any one of claims 2 to 4, characterized in that, It also includes a first auxiliary bracket and a third auxiliary bracket. The first auxiliary bracket is disposed in the first chamber and connects the front shell of the vehicle to the main bracket. The third auxiliary bracket is disposed in the third chamber and connects the pedal shell to the main bracket. The extension directions of the first auxiliary bracket and the third auxiliary bracket are perpendicular to the extension direction of the main bracket.

6. The one-piece cast two-wheeled vehicle body according to claim 2, characterized in that, The vehicle front housing includes a front housing, a rear housing, an upper housing, and a middle partition. The vehicle front housing defines a first chamber, and the middle partition is transversely placed in the middle region of the first chamber. The vehicle front assembly also includes a steering bracket, which includes a hollow steering shaft cylinder disposed in the first chamber. The middle partition has a partition through hole, and the lower end of the steering shaft cylinder is connected to the middle partition and communicates with the partition through hole. The upper housing has an upper through hole, and the upper end of the steering shaft cylinder is spaced apart from the upper housing. The upper through hole, the steering shaft cylinder, and the partition through hole are coaxially arranged. The vehicle front housing and the steering bracket are integrally cast.

7. The one-piece cast two-wheeled vehicle body according to claim 6, characterized in that, The steering bracket further includes an upper support frame connected to the upper end of the steering shaft cylinder and a lower support frame connected to the lower end of the steering shaft cylinder and the intermediate partition. The upper support frame includes a first upper connecting arm extending in the front-rear direction, with the front and rear ends of the first upper connecting arm respectively connected to the front and rear housings of the vehicle. The lower support frame includes a first lower connecting arm extending in the front-rear direction, with the front and rear ends of the first lower connecting arm respectively connected to the front and rear housings of the vehicle.

8. The one-piece cast two-wheeled vehicle body according to claim 7, characterized in that, The lower support frame is connected to the main support frame.

9. The one-piece cast two-wheeled vehicle body according to claim 2, characterized in that, The seat shell includes a front seat shell, a rear seat shell, a left seat shell, and a right seat shell. The upper and lower edges of the front seat shell, rear seat shell, left seat shell, and right seat shell respectively form an upper opening and a lower opening, which communicate with a second chamber. It also includes a seat bracket disposed in the second chamber. The seat bracket includes an upper support plate and a lower support plate, with the upper support plate located at the upper opening and the lower support plate located at the lower opening. The seat bracket further includes a left support rod, a right support rod, and a transverse support rod. The support rod is attached to the inner wall of the left housing of the seat and extends vertically. The right support rod is attached to the inner wall of the right housing of the seat and extends vertically. The lower ends of the left and right support rods are connected to the lower support plate. The transverse support rod is arranged in a U-shape and is attached to the inner walls of the front housing, left housing, and right housing of the seat shell. The two free ends of the transverse support rod are respectively connected to the upper ends of the left and right support rods. The seat shell and the seat bracket are integrally cast.

10. The one-piece cast two-wheeled vehicle body according to claim 9, characterized in that, The main bracket, which is located in the second chamber, extends vertically and is attached to the inner wall of the front housing of the seat. The main bracket is connected to the lower support plate and the transverse support rod.

11. The one-piece cast two-wheeled vehicle body according to claim 9, characterized in that, The upper open edge of the seat shell is provided with a tapered flange. The tapered flange includes a first flange extending inward from the upper edge of the front shell, rear shell, left shell, and right shell of the seat, and a second flange extending upward from the inner edge of the first flange.

12. The one-piece cast two-wheeled vehicle body according to any one of claims 1 to 4, characterized in that, It also includes several auxiliary positioning holes, which are spaced apart on the left and right sides of the front shell, seat shell and pedal shell.

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