Frame and motorcycle

Abstract

The present invention discloses a vehicle frame and a motorcycle, comprising a main frame, an intermediate frame, and side frames. The main frame comprises a handlebar mounting frame, a fuel tank mounting frame, and a seat cushion mounting frame connected in sequence. The seat cushion mounting frame is connected to a suspension system frame, and pneumatic springs are provided on both sides of the suspension system frame. The intermediate frame is connected to the rear half of the main frame and comprises two mutually symmetrical tube groups. The rear ends of the tube groups are used to mount the seat cushion of the vehicle body. The ends of the rear ends of the tube groups are connected to fixed tubes, which are respectively connected to the two tube groups. A support plate is provided between the two tube groups, and the support plate is used to support and mount the tail box of the vehicle body. Two side frames are provided, respectively connected to both sides of the intermediate frame. The side frames comprise two mutually symmetrical main beam tubes. The main beam tubes are arranged in an arc shape. The rear ends of the main beam tubes have a horizontally arranged mounting portion. The mounting portion is located directly above the mounting position and is provided with a first mounting plate.

Description

Technical Field

[0001] The present invention relates to the technical field of motorcycles, and in particular to a frame and a motorcycle. Background Art

[0002] With the continuous advancement of motorcycle technology, consumers are placing higher demands on motorcycle comfort, safety, and functionality. As a core component of a motorcycle, the frame's design directly impacts its overall performance and riding experience. Traditional frame designs often focus on basic load-bearing and driving functions, while lacking comfort, shock absorption, and ease of installation for additional equipment. Therefore, developing a frame that ensures structural strength while enhancing riding comfort and functional versatility is crucial. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a bicycle frame that can enhance the overall stability and load-bearing capacity of the bicycle frame, and also significantly improve riding comfort and the flexibility of installing additional equipment.

[0004] The vehicle frame according to the first embodiment of the present invention includes a main frame, an intermediate frame, and side frames. The main frame includes a handlebar mounting frame, a fuel tank mounting frame, and a seat mounting frame connected in sequence from front to back. The seat mounting frame is connected to a suspension system frame. Both sides of the suspension system frame are provided with sliding struts. The sliding struts are provided with pneumatic springs. The top of the pneumatic spring is connected to and supports the main frame, and the bottom is connected to the wheel. The intermediate frame is connected to the seat mounting frame. The intermediate frame includes two sets of tubes arranged symmetrically with each other. Each set of tubes includes a front end and a rear end. The front end of the tube set is provided with a connection hole for connecting to the main frame. The rear end of the tube set is used to mount the seat of the vehicle body. The end of the rear end of the tube set is connected to a fixing tube. The fixing tube is connected to the two sets of tubes respectively. A support plate is provided between the two sets of tubes. The support plate is used to support and mount the trunk of the vehicle body. There are two side brackets, which are respectively connected to the two sides of the middle bracket. The side brackets include two main beam tubes symmetrically arranged on the left and right. The main beam tubes are arranged in an arc shape to form a mounting position at the bottom for accommodating wheel installation. The front end of the main beam tube is located at the lowest position and is provided with a first connecting tube. The first connecting tube connects the two main beam tubes and extends toward the side away from the mounting position to connect the main bracket. The rear end of the main beam tube has a horizontally arranged mounting portion, which is located directly above the mounting position. The mounting portion is provided with a first mounting plate, and the first mounting plate cooperates with the main beam tube to install a fender.

[0005] The frame according to the embodiments of the present invention has at least the following beneficial effects: the main frame includes, from front to back, a handlebar mounting frame, a fuel tank mounting frame, and a seat mounting frame. A suspension system frame is connected below the seat mounting frame. Slide struts are provided on both sides of the suspension system frame, and pneumatic springs are mounted on the slide struts. The top of the pneumatic spring is connected to and supports the main frame, while the bottom is connected to the wheel. This design effectively absorbs vibration during driving and improves riding comfort. The intermediate frame is connected below the seat mounting frame and consists of two symmetrical tube groups. Each tube group includes a front end and a rear end, with a connection hole at the front end for secure connection to the main frame. The rear end is used to mount the motorcycle seat. A fixing tube is connected to the rear end of each tube group, with the two fixing tubes connecting the two tube groups, respectively, enhancing the stability of the intermediate frame. Furthermore, a support plate is provided between the two tube groups to support the rear trunk of the vehicle, increasing storage space. Each side frame features a side support, each composed of two symmetrical main beam tubes. The main beam tubes are arc-shaped, with the bottoms forming mounting points for the wheels. The front ends of the main beam tubes are located at the lowest point and feature a first connecting tube. This tube connects the two main beam tubes and extends away from the mounting point to connect to the main support, enhancing the overall rigidity of the frame. The rear ends of the main beam tubes feature a horizontal mounting portion, located directly above the mounting point. A first mounting plate is mounted on this portion. This first mounting plate mates with the main beam tubes to facilitate the installation of fenders, effectively preventing mud and water splashing.

[0006] It is understandable that the design of the suspension system bracket and pneumatic spring effectively absorbs road vibrations, improving the stability and comfort of riding. The ingenious design of the middle bracket and side bracket not only increases the load-bearing capacity of the frame, but also improves the stability and rigidity of the overall structure. The design of the support plate facilitates the installation of the trunk and increases storage space, while the first mounting plate on the side bracket facilitates the installation of the fender, improving the practicality of the vehicle. In addition, through the ingenious combination of the main bracket, the middle bracket and the side bracket, a stable triangular support system is formed, which is suitable for large-displacement three-wheeled motorcycles and greatly improves the overall stability of the vehicle body. The connection method between the various components is reasonably designed, which simplifies the installation process, reduces the difficulty of installation, and improves assembly efficiency, achieving multiple advantages such as structural stability, easy installation, strong adaptability and lightweight.

[0007] According to some embodiments of the present invention, a first support rod is provided at the bottom of the rear end of the tube group, the first support rod is connected to the main body bracket, the support plate is located between the first support rod and the fixed tube, a reinforcement rod is provided in the middle of the first support rod, the reinforcement rod is inclined toward the mounting plate and is connected to the tube group, and the reinforcement rod, the first support rod and the tube group form a triangular structure.

[0008] According to some embodiments of the present invention, a second support rod is further provided at the rear end of the tube group, and the second support rod is also used to connect to the main body bracket.

[0009] According to some embodiments of the present invention, a positioning protrusion is further provided between the two tube groups, the positioning protrusion is located between the first support rod and the second support rod, and the top of the positioning protrusion extends out of the top of the tube group to support the installation of the seat cushion.

[0010] According to some embodiments of the present invention, wing plates are connected to both sides of the support plate, the wing plates are perpendicular to the support plate and are located at the bottom of the support plate, the wing plates are triangular, and the two wing plates cooperate with the support plate to form a slot for quickly positioning and clamping between the two tube groups.

[0011] According to some embodiments of the present invention, a second mounting plate is provided at the tail end of the mounting portion, and the two sides of the second mounting plate are respectively connected to the two main beam tubes. The second mounting plate cooperates with the first mounting plate and the main beam tube to jointly support and install the fender.

[0012] According to some embodiments of the present invention, a second connecting tube is further provided on the main beam tube facing the side of the main support, and the second connecting tube is located on the side of the installation position. The second connecting tube includes two transverse tubes arranged in a horizontal direction and a longitudinal tube connected between the two transverse tubes, and the transverse tube is arranged inclined downward toward one side of the tail end of the main beam tube.

[0013] According to some embodiments of the present invention, the transverse tube located on the upper side extends toward a side away from the installation position and has a connecting portion, the connecting portion being used to connect to the main support, and a reinforcement tube is further provided at the connection between the connecting portion and the longitudinal tube, the reinforcement tube being provided at an angle to the longitudinal tube, and the end portion of the reinforcement tube being connected to the main support.

[0014] According to some embodiments of the present invention, a controller is further included, and the two pneumatic springs are electrically connected to the controller. The controller is used to obtain a steering signal and control the two pneumatic springs to perform lifting and lowering movements of a rated stroke, so that the main body bracket tends to a horizontal state.

[0015] A three-wheeled motorcycle according to an embodiment of the first aspect of the present invention comprises a frame as described in any one of the above items.

[0016] The three-wheeled motorcycle according to the embodiments of the present invention has at least the following beneficial effects: By adopting the aforementioned frame, the three-wheeled motorcycle not only improves the overall performance and stability of the vehicle, but also enables the various components of the vehicle to fit together more closely, thereby improving the overall performance and service life of the vehicle. Furthermore, the design of the suspension system bracket and pneumatic spring effectively absorbs road vibrations, improving riding stability and comfort. Furthermore, the controller's precise control of the pneumatic spring maintains the main bracket in a relatively horizontal state when the rider turns, significantly improving the vehicle's handling stability and riding safety.

[0017] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0019] Figure 1 is a schematic diagram of a frame according to an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the connection between the middle bracket and the side bracket of the frame according to an embodiment of the present invention.

[0021] Figure markings: main body bracket 100; handle mounting bracket 110; fuel tank mounting bracket 120; seat cushion mounting bracket 130; suspension system bracket 140; pneumatic spring 141; intermediate bracket 200; pipe group 210; first support rod 211; reinforcement rod 212; second support rod 213; fixing rod 220; support plate 230; wing plate 231; positioning protrusion 240; side bracket 300; main beam tube 310; first mounting plate 311; second mounting plate 312; first connecting tube 320; second connecting tube 330; transverse tube 331; main tube 332; reinforcement tube 333. DETAILED DESCRIPTION

[0022] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0024] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the present invention based on the specific content of the technical solution. In the description of the present invention, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with such embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In the description of this specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with such embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0026] Reference Figure 1 and Figure 2The present invention provides a vehicle frame, comprising a main frame 100, an intermediate frame 200, and a side frame 300. The main frame 100 comprises a handlebar mounting frame 110, a fuel tank mounting frame 120, and a seat mounting frame 130, which are sequentially connected from front to back. The seat mounting frame 130 is connected to a suspension system frame 140. Both sides of the suspension system frame 140 are provided with sliding struts, each of which is provided with a pneumatic spring 141. The top of the pneumatic spring 141 is connected to and supports the main frame 100, and the bottom is connected to the wheel. The middle bracket 200 is connected to the seat cushion mounting frame 130. The middle bracket 200 includes two groups of tube groups 210 that are symmetrically arranged with each other. Each group of tube groups 210 includes a front end and a rear end. The front end of the tube group 210 is provided with a connecting hole for connecting to the main bracket 100, and the rear end of the tube group 210 is used to install the seat cushion of the vehicle body. The end of the rear end of the tube group 210 is connected to a fixing pipe, and the fixing pipe is respectively connected to the two groups of tube groups 210. A support plate 230 is provided between the two groups of tube groups 210, and the support plate 230 is used to support the installation of the trunk of the vehicle body. There are two side brackets 300, which are respectively connected to the two sides of the middle bracket 200. The side bracket 300 includes two main beam tubes 310 that are symmetrically arranged with each other. The main beam tubes 310 are arranged in an arc shape to form an installation position for accommodating wheel installation at the bottom. The front end of the main beam tube 310 is located at the lowest position and is provided with a first connecting tube 320. The first connecting tube 320 connects the two main beam tubes 310 and extends toward the side away from the installation position to connect to the main bracket 100. The rear end of the main beam tube 310 has a horizontally arranged installation portion, which is located directly above the installation position. The installation portion is provided with a first mounting plate 311. The first mounting plate 311 cooperates with the main beam tube 310 to install the fender.

[0027] In a specific embodiment, the main frame 100 includes, from front to back, a handlebar mounting bracket 110, a fuel tank mounting bracket 120, and a seat mounting bracket 130. Connected below the seat mounting bracket 130 is a suspension bracket 140. Two struts are located on either side of the suspension bracket 140, each of which is mounted with pneumatic springs 141. The pneumatic springs 141 are connected to and support the main frame 100 at their tops, while their bottoms are connected to the wheels. This design effectively absorbs vibrations during driving and improves riding comfort. Connected below the seat mounting bracket 130 is an intermediate bracket 200, consisting of two bilaterally symmetrical tube groups 210. Each tube group 210 has a front end and a rear end. The front end is provided with a connection hole for secure connection to the main frame 100. The rear end is used to mount the motorcycle seat. A fixing tube is connected to the rear end of each tube group 210, with the two fixing tubes connecting the two tube groups 210, respectively, enhancing the stability of the intermediate bracket 200. In addition, a support plate 230 is provided between the two tube groups 210 for supporting the installation of the trunk of the vehicle body, thereby increasing the storage space. A side bracket 300 is provided on each side of the vehicle frame. Each side bracket 300 is composed of two left-right symmetrical main beam tubes 310. The main beam tubes 310 are designed in an arc shape, and the bottom forms a mounting position for the wheel. The front end of the main beam tube 310 is located at the lowest point and is provided with a first connecting tube 320. The first connecting tube 320 connects the two main beam tubes 310 and extends toward the side away from the mounting position to connect to the main bracket 100, thereby enhancing the overall rigidity of the vehicle frame. The rear end of the main beam tube 310 is provided with a horizontal mounting portion. The mounting portion is located just above the mounting position, and a first mounting plate 311 is installed thereon. The first mounting plate 311 cooperates with the main beam tube 310 to facilitate the installation of mudguards, effectively preventing mud and water splashing.

[0028] It can be understood that the design of the suspension system bracket 140 and the pneumatic spring 141 effectively absorbs road vibrations and improves the stability and comfort of riding. The ingenious design of the middle bracket 200 and the side bracket 300 not only increases the load-bearing capacity of the frame, but also improves the stability and rigidity of the overall structure. The design of the support plate 230 facilitates the installation of the trunk and increases the storage space, while the first mounting plate 311 on the side bracket 300 facilitates the installation of the fender, improving the practicality of the vehicle. Moreover, through the ingenious combination of the main bracket 100, the middle bracket 200 and the side bracket 300, a stable triangular support system is formed, which is suitable for large-displacement three-wheeled motorcycles and greatly improves the overall stability of the vehicle body. The connection method between the components is reasonably designed, which simplifies the installation process, reduces the difficulty of installation, improves assembly efficiency, and achieves multiple advantages such as structural stability, convenient installation, strong adaptability and lightweight.

[0029] It should be noted that the frame proposed in the present invention also includes a controller electrically connected to the two pneumatic springs 141, capable of acquiring and processing signals from the vehicle's steering system in real time. When the rider makes a steering operation during driving, the steering signal is transmitted to the controller. Based on the received signal, the controller quickly calculates the required travel adjustment of the pneumatic springs 141 to maintain the main frame 100 in a horizontal position.

[0030] Subsequently, the controller sends instructions to the two pneumatic springs 141 to control them to perform lifting and lowering movements within the rated stroke. This adjustment process is intended to offset the vehicle body tilt caused by turning, so that the main frame 100 and the driving components mounted thereon remain in a relatively horizontal state. This not only helps to improve the rider's handling stability, but also reduces the discomfort caused by the vehicle body tilt to a certain extent. Through the precise control of the pneumatic spring 141 by the controller, the present invention can maintain the relative horizontal state of the main frame 100 when the rider turns, thereby significantly improving the vehicle's handling stability and riding safety. The reduction in vehicle body tilt means that the lateral force and discomfort experienced by the rider when turning will also be reduced accordingly. This helps to improve the overall comfort and satisfaction of riding, realizes the intelligent control of the pneumatic spring 141, not only improves the handling stability and riding comfort, but also lays a solid foundation for the intelligent development of the frame.

[0031] It should be noted that, during implementation, the controller design must ensure that it can accurately and quickly respond to steering signals and has sufficient processing power to precisely control the lifting and lowering motion of the pneumatic spring 141. Furthermore, the selection of the pneumatic spring 141 must also meet the requirements of fast response and stable motion to ensure the effectiveness and reliability of the entire system.

[0032] Reference Figure 2 Specifically, a first support rod 211 is added to the bottom of the rear end of each tube group 210. These first support rods 211 are connected to the main support 100, providing additional support for the intermediate support 200 and enhancing the stability of the structure. At the same time, the support plate 230 is cleverly designed between the first support rod 211 and the fixed tube, forming a stable support area for installing and supporting the seat cushion of the vehicle body. In order to further enhance the strength and stability of the structure, we set a reinforcement rod 212 in the middle of the first support rod 211. These reinforcement rods 212 are tilted toward the mounting plate and connected to the tube group 210, forming a triangular structure together with the first support rod 211 and the tube group 210. This triangular structural design not only improves the overall load-bearing capacity, but also effectively disperses stress, making the entire mounting frame more stable and durable, and able to better cope with various complex road conditions and driving conditions.

[0033] Furthermore, a second support rod 213 is added to the rear end of each tube assembly 210. These second support rods 213 are also used to connect to the main frame 100. Together with the first support rods 211, they provide more comprehensive support for the intermediate frame 200, improving structural stability. They also enable the mounting frame to better adapt to seat cushions of different sizes and weights, enhancing vehicle comfort and riding experience. They also further enhance the supporting capacity of the intermediate frame 200, allowing the mounting frame to more firmly support the seat cushion and other vehicle body components.

[0034] Furthermore, a positioning plate 240 is added between the two tube groups 210. Positioning plate 240 is located between the first support rod 211 and the second support rod 213, with its top extending above the top of the tube group 210. It is used to support and position the seat cushion for installation. This not only makes seat cushion installation more convenient and quick, but also improves the seat cushion's stability and comfort, providing a stable and reliable installation platform for the seat cushion.

[0035] In some embodiments, wings 231 are added to either side of the support plate 230. The wings 231 are perpendicular to the support plate 230 and located at its base, forming a triangular design. The two wings 231 and the support plate 230 together form a slot for quickly positioning and snapping the support plate 230 between the two tube assemblies 210. This not only simplifies the installation process of the support plate 230, making it more convenient and quick, but also improves its stability and load-bearing capacity.

[0036] Reference Figure 2 Specifically, a second mounting plate 312 is added to the rear end of the mounting portion of the side bracket 300. This second mounting plate 312 is connected to the two main beam tubes 310 and, together with the first mounting plate 311 and the main beam tubes 310, supports the fender. This design not only improves the fender's stability and load-bearing capacity, but also makes installation more convenient and quick.

[0037] Furthermore, a second connecting tube 330 is added to the main beam tube 310 on the side facing the main frame 100. These second connecting tubes 330 are located to the side of the mounting area and include two horizontal transverse tubes 331 and a longitudinal tube connecting the two transverse tubes 331. The transverse tubes 331 are tilted downward toward the rear end of the main beam tube 310, allowing for a better connection between the connecting portion and the main frame 100 and enhancing the stability of the connection.

[0038] Furthermore, the upper transverse tube 331 of the second connecting tube 330 extends away from the mounting position to form a connecting portion for connecting to the main frame 100. Reinforcement tubes 333 are also added where the connecting portion meets the longitudinal tube. These reinforcement tubes 333 are arranged at an angle to the longitudinal tube, with their ends connected to the main frame 100. This further strengthens the connection between the second connecting tube 330 and the main frame 100, enhancing the overall stability of the mounting frame.

[0039] Reference Figure 1 It should be noted that the main frame 100 includes a handlebar mounting frame 110, a fuel tank mounting frame 120, and a seat mounting frame 130, which are connected in sequence from front to back. The intermediate frame 200 is connected to the seat mounting frame 130, making the entire mounting frame structure more compact and reasonable, and facilitating the installation and removal of various components.

[0040] A second aspect of the present invention further provides a three-wheeled motorcycle, particularly a large-displacement three-wheeled motorcycle, comprising a frame as described in any of the above items. By employing the aforementioned frame, this three-wheeled motorcycle not only improves the overall performance and stability of the vehicle but also enables the various components of the vehicle to fit more closely together, thereby enhancing the overall performance and service life of the vehicle. Furthermore, the design of the suspension system bracket 140 and pneumatic spring 141 effectively absorbs road vibrations, improving riding stability and comfort. Furthermore, through the precise control of the pneumatic spring 141 by the controller, the main frame 100 is maintained in a relatively horizontal state when the rider turns, significantly enhancing the vehicle's handling stability and riding safety.

[0041] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A vehicle frame, characterized in that: include: The main frame includes a handlebar mounting frame, a fuel tank mounting frame, and a seat mounting frame connected in sequence from front to back. The seat mounting frame is connected to a suspension system frame. Both sides of the suspension system frame are provided with sliding columns. The sliding columns are provided with pneumatic springs. The top of the pneumatic spring is connected to and supports the main frame, and the bottom is connected to the wheel. An intermediate bracket is connected to the seat cushion mounting frame, and the intermediate bracket includes two groups of tubes arranged symmetrically with each other, each group of the tubes including a front end and a rear end, wherein the front end of the tube group is provided with a connection hole for connecting to the main bracket, and the rear end of the tube group is used to mount the seat cushion of the vehicle body, and the rear end of the tube group is connected to a fixing tube, and the fixing tube is respectively connected to the two groups of the tube groups, and a support plate is provided between the two groups of the tube groups, and the support plate is used to support and mount the tail box of the vehicle body; There are two side brackets, which are respectively connected to the two sides of the middle bracket. The side brackets include two main beam tubes that are symmetrically arranged with each other. The main beam tubes are arranged in an arc shape to form a mounting position at the bottom for accommodating wheel installation. The front end of the main beam tube is located at the lowest position and is provided with a first connecting tube. The first connecting tube connects the two main beam tubes and extends toward the side away from the mounting position to connect the main bracket. The rear end of the main beam tube has a horizontally arranged mounting portion, which is located directly above the mounting position. The mounting portion is provided with a first mounting plate, and the first mounting plate cooperates with the main beam tube to install a fender.

2. The frame according to claim 1, wherein: A first support rod is provided at the bottom of the rear end of the tube group, the first support rod is connected to the main bracket, the support plate is located between the first support rod and the fixed tube, a reinforcement rod is provided in the middle of the first support rod, the reinforcement rod is inclined toward the mounting plate and connected to the tube group, the reinforcement rod, the first support rod and the tube group form a triangular structure.

3. The frame according to claim 2, wherein: A second support rod is also provided at the rear end of the tube group, and the second support rod is also used to connect to the main body bracket.

4. The frame according to claim 3, wherein: A positioning convex plate is also provided between the two tube groups. The positioning convex plate is located between the first support rod and the second support rod, and the top of the positioning convex plate extends out of the top of the tube group to support and position the installation of the seat cushion.

5. The vehicle frame according to claim 4, wherein: Wing plates are connected to both sides of the support plate. The wing plates are perpendicular to the support plate and are located at the bottom of the support plate. The wing plates are triangular. The two wing plates cooperate with the support plate to form a slot for quickly positioning and clamping between the two tube groups.

6. The vehicle frame according to claim 4, wherein: A second mounting plate is provided at the tail end of the mounting portion, and both sides of the second mounting plate are respectively connected to the two main beam tubes. The second mounting plate cooperates with the first mounting plate and the main beam tube to jointly support and install the fender.

7. The frame according to claim 1, wherein: A second connecting tube is also provided on the main beam tube toward the side of the main support. The second connecting tube is located on the side of the installation position. The second connecting tube includes two horizontal tubes arranged in a horizontal direction and a longitudinal tube connected between the two horizontal tubes. The horizontal tube is arranged downwardly at an angle toward the side of the tail end of the main beam tube.

8. The vehicle frame according to claim 7, wherein: The transverse tube located on the upper side extends to the side away from the installation position and has a connecting portion, which is used to connect the main bracket. A reinforcement tube is also provided at the connection between the connecting portion and the longitudinal tube. The reinforcement tube is set at an angle to the longitudinal tube, and its end is connected to the main bracket.

9. The vehicle frame according to claim 1, wherein: It also includes a controller, and the two pneumatic springs are electrically connected to the controller. The controller is used to obtain a steering signal and control the two pneumatic springs to perform lifting and lowering movements within a rated stroke so that the main body bracket tends to a horizontal state.

10. A three-wheeled motorcycle, characterized in that: Comprising the frame as claimed in claim 9.

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