Motorcycles and their body frames

Abstract

The present application relates to a motorcycle and its body frame, the body frame comprising two main pipes, a bottom pipe, a connecting pipe, a rear cradle shaft, and a reinforcement pipe. The outer pipe walls of the two main pipes are each provided with a first connecting portion protruding therefrom. The ends of the connecting pipe are respectively connected to the first connecting portions of the two main pipes. The rear cradle shaft is passed through a through hole of the connecting pipe, and the portion of the rear cradle passing through the connecting pipe is provided with a first mounting portion for mounting the rear cradle shaft, thereby enabling the rear cradle to be mounted on the outside of the body frame. The above-mentioned body frame mounts the rear cradle on the outside of the body frame. On the one hand, this effectively reduces the distance between the two main pipes, thereby shortening the length of the reinforcement pipe and reducing the weight of the pipe fittings. On the other hand, it reduces the support span of the bottom pipe and the reinforcement pipe, thereby effectively reducing the stress of the bottom pipe and the reinforcement pipe when bearing loads. This allows the wall thickness of the bottom pipe and the reinforcement pipe to be thinned while maintaining sufficient strength of the body, thereby achieving lightweighting of the motorcycle.

Description

Technical Field

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

[0002] Motorcycles are a common means of transportation for people. The motorcycle frame is the main load-bearing component of the motorcycle. The frame is used to mount and connect multiple motorcycle components, including handlebars, wheels, rear shock absorbers, and support legs. Therefore, the rigidity of the motorcycle frame and the strength of its components are particularly critical. Currently, common motorcycle frames include single-tube and double-tube structures. Double-tube motorcycle frames consist of two main tubes and a bottom tube connecting the two main tubes. The bottom tubes of double-tube frames in related technologies have poor bending and torsional resistance, as well as poor load-bearing capacity. To ensure sufficient strength under load, the bottom tube wall thickness is difficult to reduce, making it difficult to achieve lightweighting. Summary of the Invention

[0003] Based on this, it is necessary to provide a motorcycle and its body frame to address the problem that it is difficult to achieve lightweighting in related technologies. The technical solution is as follows:

[0004] On the one hand, a vehicle body frame is provided, which includes two main pipes, a bottom pipe, a connecting pipe, a rear cradle shaft and a reinforcing pipe, the two main pipes are arranged at intervals, the outer pipe wall of each main pipe is protruded with a first connecting portion, one end of the two main pipes is connected to the bottom pipe, the two ends of the connecting pipe are respectively connected to the first connecting portions of the two main pipes, the connecting pipe is axially provided with a through hole, the rear cradle shaft is passed through the through hole, and the part of the rear cradle passing through the connecting pipe is provided with a first mounting portion for mounting the rear cradle shaft, and the two ends of the reinforcing pipe are respectively connected to the two main pipes.

[0005] The technical solution is further described below:

[0006] In one embodiment, the two main pipes are structures that are bent or inclined toward the ground, and the first connecting portion is correspondingly provided on one side of the bent or inclined main pipe.

[0007] In one embodiment, the reinforcing tube is provided with two second connection parts that are spaced apart, and the second connection parts are provided on the inner side or the outer side of the connection between the reinforcing tube and the main tube, and the bottom tube is provided with two third connection parts that are spaced apart, and the two second connection parts and the two third connection parts cooperate to form a second mounting part for mounting the engine.

[0008] In one embodiment, the reinforcing tube is provided with a first mounting seat, and the bottom tube is provided with a second mounting seat. The first mounting seat and the second mounting seat cooperate to form a third mounting portion for mounting the shock absorbing structure.

[0009] In one embodiment, the first mounting seat is protruded from the middle portion of the reinforcement tube, and the second mounting seat is protruded from the middle portion of the bottom tube.

[0010] In one embodiment, the distance between the two main pipes gradually increases in a direction away from the bottom pipe.

[0011] In one embodiment, the vehicle body frame further includes two first reinforcing plates, which are respectively connected to the two ends of the bottom tube in a one-to-one correspondence, one end of the first reinforcing plate is connected to the bottom tube in a one-to-one correspondence, and the other end of the first reinforcing plate is connected to the first mounting portion in a one-to-one correspondence.

[0012] In one embodiment, the vehicle body frame further includes a mounting plate and a second reinforcing plate, wherein the mounting plate is connected to the bottom tube, the mounting plate is provided with a mounting hole for mounting a side bracket, and the second reinforcing plate is connected to a side of the mounting plate close to the bottom tube.

[0013] In one embodiment, the vehicle body frame further includes a mounting tube for mounting a front fork, and the other ends of the two main tubes are connected to the mounting tube.

[0014] In one embodiment, the vehicle body frame further includes a mounting tube for mounting a front fork, and the other ends of the two main tubes are connected to the mounting tube.

[0015] On the other hand, a motorcycle is provided, comprising a rear cradle, a shock absorbing structure, a side stand, an engine, a front fork and the body frame, wherein the rear cradle is detachably connected to the first mounting portion, and the shock absorbing structure, the side stand, the engine and the front fork are all detachably connected to the body frame.

[0016] In the aforementioned motorcycle and its body frame, the main pipe is provided with a first connecting portion, with both ends of the connecting pipe respectively connected to the first connecting portions of the two main pipes. The connecting pipe has an axial through-hole, the rear cradle shaft is passed through the through-hole, and the portion of the rear cradle extending from the connecting pipe is provided with a first mounting portion for mounting the rear cradle, thereby enabling the rear cradle to be mounted on the outside of the body frame. Compared to designs that place the rear cradle between the two main pipes, the aforementioned body frame mounts the rear cradle on the outside of the body frame. This, on the one hand, effectively reduces the spacing between the two main pipes, thereby shortening the length of the reinforcement pipe and reducing the weight of the pipe fittings. On the other hand, it reduces the support span of the bottom pipe and reinforcement pipe, effectively reducing the stress on the bottom pipe and reinforcement pipe when bearing loads. This allows the wall thickness of the bottom pipe and reinforcement pipe to be reduced while maintaining sufficient body strength, thereby achieving a lightweight motorcycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a schematic structural diagram of a vehicle body frame according to an embodiment of the present application.

[0020] Figure 2 for Figure 1 A schematic structural diagram of the vehicle body frame from another angle.

[0021] 10. Vehicle body frame; 100. Main pipe; 110. First connecting part; 200. Bottom pipe; 210. Third connecting part; 220. Second mounting seat; 300. Connecting pipe; 400. Reinforcing pipe; 410. Second connecting part; 420. First mounting seat; 500. First reinforcing plate; 510. Second reinforcing plate; 600. Mounting plate; 610. Mounting hole; 700. Mounting pipe; 800. Rear cradle; 810. Rear cradle shaft. DETAILED DESCRIPTION

[0022] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0023] In the description of this application, it should be noted that if the terms "a certain body" or "a certain part" appear, these terms can be a part of the corresponding "component", that is, the "a certain body" or "a certain part" is manufactured as a whole with the "other parts of the component"; or it can be an independent component that is separable from the "other parts of the component", that is, the "a certain body" or "a certain part" can be manufactured independently and then combined with the "other parts of the component" into a whole. The expression of the above-mentioned "a certain body" or "a certain part" in this application is only one embodiment, for the convenience of reading, and not to limit the scope of protection of this application. As long as it contains the above-mentioned features and has the same function, it should be understood as an equivalent technical solution of this application.

[0024] In the description of this application, it should be noted that if the terms "unit," "assembly," "mechanism," and "device" appear, the components included in these terms can also be flexibly combined, that is, modular production can be carried out according to actual needs to facilitate modular assembly. The division of the above components in this application is only one embodiment, for the convenience of reading, and not to limit the scope of protection of this application. As long as the above components are included and have the same functions, it should be understood that they are equivalent technical solutions of this application.

[0025] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0026] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0027] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0028] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0029] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0030] Lightweight motorcycle design refers to minimizing the mass of the body frame while ensuring product strength, rigidity, and safety, thereby improving the motorcycle's power performance and handling. As described in the background art, the related art double-tube motorcycle body frame includes two main pipes and a bottom pipe connecting the two main pipes. The two main pipes and the bottom pipe are often designed to form a rectangular structure with a large spacing to accommodate the rear cradle, resulting in the bottom pipe also needing to be designed to be longer. Because the two main pipes and the connecting pipe form a load-bearing structure similar to a simply supported beam, when the bottom pipe is subjected to the load applied by the rear shock absorber, setting a larger support span will result in the bottom pipe's poor bending and torsional resistance and load-bearing capacity. Therefore, it is necessary to increase the wall thickness of the bottom pipe to maintain the strength of the body frame, which increases the weight of the motorcycle and makes it difficult to achieve lightweighting.

[0031] To solve the above problems, Figures 1 to 2 As shown, in one embodiment, a vehicle body frame 10 is provided, which includes two main pipes 100, a bottom pipe 200, a connecting pipe 300, a rear cradle shaft 810 and a reinforcing pipe 400. The two main pipes 100 are arranged at intervals, and the outer pipe wall of each main pipe 100 is protruded with a first connecting portion 110. One end of the two main pipes 100 is connected to the bottom pipe 200, and the two ends of the connecting pipe 300 are respectively connected to the first connecting portions 110 of the two main pipes 100. A through hole is opened in the connecting pipe 300 in the axial direction, and the rear cradle shaft 810 is passed through the through hole. The part of the rear cradle shaft 810 passing through the connecting pipe 300 is provided with a first mounting portion for mounting the rear cradle 800, and the two ends of the reinforcing pipe 400 are respectively connected to the two main pipes 100.

[0032] The first connecting portions 110 of the two main pipes 100 can be positioned relative to each other, thereby ensuring symmetry and uniform stress distribution throughout the vehicle body frame 10. The main pipes 100 can be round, square, or other special-shaped pipes. They can be solid structures such as beams and shafts, or hollow, box-shaped. They can be integral or welded from sheet metal parts, as long as the main pipes 100, base pipes 200, connecting pipes 300, and reinforcing pipes 400 form a complete vehicle body frame 10.

[0033] The connecting pipe 300 and the rear cradle 800 can be rotatably connected, and the first mounting portion can be equipped with a bearing supporting the rear cradle shaft 810. This not only enables the rear suspension's kinematic function, but also allows the rear cradle 800 to transmit the forces exerted by the rear wheels in all directions on the ground to the main pipe 100 via the first connecting portion 110, effectively reducing the strength requirements of the connecting pipe 300.

[0034] In the above-mentioned vehicle body frame 10, the main pipe 100 is provided with a first connecting portion 110, and the two ends of the connecting pipe 300 are respectively connected to the first connecting portions 110 of the two main pipes 100. The connecting pipe 300 is provided with a through hole in the axial direction, and the rear cradle shaft 810 is passed through the through hole and the part of the rear cradle 800 passing through the connecting pipe 300 is provided with a first connecting portion 110 for installing the rear cradle 800, so that the rear cradle 800 can be installed on the outside of the vehicle body frame 10. Compared with the design in the related art in which the rear cradle 800 is arranged between the two main pipes 100, the above-mentioned body frame 10 installs the rear cradle 800 on the outside of the body frame 10. On the one hand, it effectively reduces the distance between the two main pipes 100, thereby shortening the length of the reinforcement pipe 400 and reducing the weight of the pipe; on the other hand, it reduces the support span of the bottom pipe 200 and the reinforcement pipe 400, thereby effectively reducing the stress of the bottom pipe 200 and the reinforcement pipe 400 when bearing loads, so that the wall thickness of the bottom pipe 200 and the reinforcement pipe 400 can be thinned while maintaining sufficient strength of the vehicle body, thereby achieving lightweighting of the motorcycle.

[0035] In one embodiment, Figures 1 to 2 As shown, the reinforcement tube 400 is provided with two spaced-apart second connecting portions 410, located either inside or outside the junction between the reinforcement tube 400 and the main tube 100. The bottom tube 200 is provided with two spaced-apart third connecting portions 210. The second connecting portions 410 and the two third connecting portions 210 of the two main tubes 100 cooperate to form a second mounting portion for mounting the engine. This not only achieves engine mounting, but also provides reliable support for the engine itself, providing support for the reinforcement tube 400 and main tube 100.

[0036] In one embodiment, Figure 1 As shown, the two main pipes 100 are bent or inclined toward the ground, and the first connecting portion 110 is correspondingly provided on the bent or inclined side of the main pipe 100. In this way, the overall shape of the vehicle body frame 10 formed by the bent main pipe 100 can better adapt to the overall component distribution of the motorcycle.

[0037] In one embodiment, Figures 1 to 2 As shown, the reinforcing tube 400 is provided with a first mounting seat 420 , and the bottom tube 200 is provided with a second mounting seat 220 . The first mounting seat 420 and the second mounting seat 220 cooperate to form a third mounting portion for mounting the shock absorbing structure.

[0038] Furthermore, based on the above embodiment, Figures 1 to 2As shown, the first mounting seat 420 is disposed in the middle of the reinforcing tube 400, and the second mounting seat 220 can be disposed in the middle of the bottom tube 200. In this case, the load applied by the shock-absorbing structure to the first mounting seat 420 and the second mounting seat 220 will be transmitted to the reinforcing tube 400 and the bottom tube 200. At the same time, the main tube 100 and the engine mounting structure provide good support for the bottom tube 200 and the reinforcing tube 400, thereby improving the overall force structure of the reinforcing tube 400 and the bottom tube 200, reducing the wall thickness requirements of the reinforcing tube 400 and the bottom tube 200, and further reducing the mass of the vehicle body frame 10.

[0039] The shock-absorbing structure includes a rear shock absorber and a rear shock-absorbing transmission mechanism, which are connected to the rear shock absorber transmission mechanism, which are connected to the second mounting portion, and the rear shock absorber transmission mechanism is connected to the first mounting seat 420 and the second mounting seat 220. Furthermore, the rear shock absorber transmission mechanism mainly includes a rear rocker arm or a rear damper connecting rod, etc., as long as it can cooperate with the rear shock absorber transmission to form a shock-absorbing structure.

[0040] In one embodiment, Figures 1 to 2 As shown, the distance between the two main pipes 100 gradually increases in a direction away from the bottom pipe 200. By arranging the distance between the two main pipes 100 to gradually increase in a direction away from the bottom pipe 200, the rear cradle 800 can be positioned outside the vehicle body frame 10 while maximizing the installation space between the main pipes 10 for the engine and other motorcycle components. This further improves the structure of the vehicle body frame 10 and enhances the rigidity of the vehicle body frame 10.

[0041] The ends of the bottom tube 200 can extend toward the side of the two main tubes 100 away from the other main tube 100, and the length of the bottom tube 200 can be extended or reduced according to the actual connection needs with other motorcycle parts. The diameter of the bottom tube 200 can be designed to be larger than the outer diameter of the connecting tube 300. Under the premise of the same cross-sectional area, the pipe with a larger diameter and smaller wall thickness has better bending and torsion resistance, which is conducive to improving strength and rigidity. At the same time, the outer wall of the pipe has more space for arranging components such as the third connecting portion 210 and the second mounting seat 220, thereby increasing the design freedom of the vehicle body frame 10.

[0042] In one embodiment, Figures 1 to 2As shown, the vehicle body frame 10 further includes two first reinforcing plates 500. The two first reinforcing plates 500 are respectively and correspondingly connected to the two ends of the bottom pipe 200. One end of the first reinforcing plate 500 is correspondingly connected to one end of the bottom pipe 200, and the other end of the first reinforcing plate 500 is correspondingly connected to the first mounting portion 500. When the motorcycle turns, the rear wheel continuously applies a force in the left - right direction to the rear swing arm 800. To prevent the rear swing arm 800 from swinging too much, the connecting pipe 300 needs to have sufficient rigidity to support the rear swing arm 800 to ensure the stability of the vehicle. To solve the above - mentioned problem, in this embodiment, by arranging a reinforcing plate between the bottom pipe 200 and the connecting pipe 300, on the one hand, the bottom pipe 200, the connecting pipe 300, the main pipe 100 and the reinforcing plate form a "mu" - shaped frame structure, which improves the supporting rigidity of the vehicle body frame 10 for the connecting pipe 300; on the other hand, part of the force exerted by the rear swing arm 800 on the connecting pipe 300 can be transmitted to the reinforcing plate, so as to improve the force on the first connecting portion 110 that originally supports the connecting pipe 300, and further effectively reduce the requirement for the material plate thickness of the first connecting portion 110, and further reduce the overall weight of the motorcycle. Among them, the material of the reinforcing plate can be set as aluminum alloy. The reinforcing plate formed by aluminum alloy has a certain strength and a small mass at the same time. Therefore, using aluminum alloy to make the reinforcing plate can further reduce the mass of the vehicle body frame 10.

[0043] Further, on the basis of the above - mentioned embodiment, as Figures 1 to 2 shown, the vehicle body frame 10 further includes a mounting plate 600 and a second reinforcing plate 510. The mounting plate 600 is connected to one end of the bottom pipe 200. The mounting plate 600 is provided with a mounting plate 610 for mounting the side stand. A second reinforcing plate is connected to the side of the mounting plate 600 close to the bottom pipe 200. Specifically, the mounting plate 600 is welded to the end of the bottom pipe 200 by circumferential welding, and the second reinforcing plate 510 is welded to the outer wall of the bottom pipe 200 by fillet welding. The circumferential weld and the fillet weld form a connection structure that is approximately at a right angle in the Figure 2 viewing angle direction, so as to provide good support for the mounting plate 600, which helps to improve the force on the mounting plate 600 when the side stand is parked, effectively reduces the requirement for the material plate thickness of the mounting plate 600, and further can reduce the overall weight of the motorcycle by reducing the plate thickness of the mounting plate 600.

[0044] In one embodiment, as Figures 1 to 2 shown, the vehicle body frame 10 further includes a mounting pipe 700 for mounting the front fork. The other ends of the two main pipes 100 are both connected to the mounting pipe 700. In this way, the two main pipes 100 and the connecting pipe 300 form a closed structure, and a receiving space for mounting other components of the motorcycle is formed between the two main pipes 100 and the bottom pipe 200.

[0045] It should be noted that there are various ways to connect the various components of the vehicle body frame 10 of any of the above embodiments, such as snap connection, connection with bolts, connection with rivets, bonding or welding, etc. It is only necessary to ensure that the various components are firmly installed.

[0046] In one embodiment, Figures 1 to 2 As shown, a motorcycle is provided, including a rear cradle 800, a shock absorbing structure, a side bracket, an engine, a front fork and a body frame 10, wherein the rear cradle 800 is detachably connected to the first mounting portion 500 of the rear cradle 800 mounting portion, and the shock absorbing structure, the side bracket, the engine and the front fork are all detachably connected to the body frame 10.

[0047] In the motorcycle of the above embodiment, by installing the rear cradle 800 on the outside of the body frame 10, the distance between the two main pipes 100 and the bottom pipe 200 is effectively reduced. On the one hand, the length of the reinforcement pipe 400 is shortened, thereby reducing the weight of the pipe. On the other hand, the support span of the bottom pipe 200 and the reinforcement pipe 400 is reduced, thereby effectively reducing the stress of the bottom pipe 200 and the reinforcement pipe 400 when bearing loads. As a result, the wall thickness of the bottom pipe 200 and the reinforcement pipe 400 can be thinned while maintaining sufficient strength of the vehicle body, thereby achieving lightweighting of the motorcycle.

[0048] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A vehicle body frame, characterized in that: The vehicle body frame comprises: Two main pipes, the two main pipes are spaced apart, and the outer pipe wall of each main pipe is protruded with a first connecting portion; a bottom pipe, one end of each of the two main pipes being connected to the bottom pipe; a connecting pipe and a rear cradle shaft, wherein both ends of the connecting pipe are respectively connected to the first connecting portions of the two main pipes, the connecting pipe is provided with a through hole in the axial direction, the rear cradle shaft is passed through the through hole, and a first mounting portion for mounting the rear cradle is provided at a portion of the rear cradle shaft passing through the connecting pipe; and A reinforcement pipe, the two ends of which are respectively connected to the two main pipes; The reinforcing tube is provided with a first mounting seat, and the bottom tube is provided with a second mounting seat. The first mounting seat and the second mounting seat cooperate to form a third mounting portion for mounting a shock absorbing structure; the vehicle body frame also includes a mounting tube for mounting a front fork, and the other ends of the two main tubes are connected to the mounting tube.

2. The vehicle body frame according to claim 1, wherein: The two main pipes are structures that are bent or inclined toward the ground, and the first connecting portion is correspondingly provided on one side of the bent or inclined main pipe.

3. The vehicle body frame according to claim 1, wherein: The reinforcement pipe is provided with two second connection parts arranged at intervals, and the second connection parts are arranged on the inner side or the outer side of the connection between the reinforcement pipe and the main pipe. The bottom pipe is provided with two third connection parts arranged at intervals, and the two second connection parts and the two third connection parts cooperate to form a second mounting part for mounting the engine.

4. The vehicle body frame according to claim 1, wherein: The first mounting portion is provided with a bearing, and the bearing is used to support the rear cradle shaft.

5. The vehicle body frame according to claim 1, wherein: The first mounting seat is protruded from the middle portion of the reinforcement tube, and the second mounting seat is protruded from the middle portion of the bottom tube.

6. The vehicle body frame according to claim 1, wherein: The distance between the two main pipes gradually increases in a direction away from the bottom pipe.

7. The vehicle body frame according to claim 1, wherein: The vehicle body frame also includes two first reinforcing plates, which are respectively connected to the two ends of the bottom tube in a one-to-one correspondence. One end of the first reinforcing plate is connected to the bottom tube in a one-to-one correspondence, and the other end of the first reinforcing plate is connected to the first mounting portion in a one-to-one correspondence.

8. The vehicle body frame according to claim 1, wherein: The vehicle body frame further includes a mounting plate and a second reinforcing plate. The mounting plate is connected to the bottom tube and is provided with mounting holes for mounting side brackets. The second reinforcing plate is connected to a side of the mounting plate close to the bottom tube.

9. The vehicle body frame according to claim 8, wherein: The mounting plate is welded to the end of the bottom tube by circumferential welding, and the second reinforcing plate is welded to the outer wall of the bottom tube by fillet welding.

10. A motorcycle, characterized in that: It includes a rear cradle, a shock absorbing structure, a side bracket, an engine, a front fork and a body frame as described in any one of claims 1 to 9, the rear cradle is detachably connected to the first mounting portion, and the shock absorbing structure, the side bracket, the engine and the front fork are all detachably connected to the body frame.

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