Frame and bicycle

Abstract

A frame (100), comprising a main beam tube (10), a five-way tube (20), and a central tube (30), wherein the central tube (30) comprises a tube body (31), and the tube body (31) is connected to the main beam tube (10) and the five-way tube (20); the tube body (31) has a central axis (L) extending in the extension direction of the tube body (31); the tube wall of the tube body (31) on one side of the central axis (L) is recessed inwardly, so that an assembling recess (32) used for assembling a front derailleur (200) is formed on the outer surface of the tube body (31); the tube wall of the tube body (31) on the other side of the central axis (L) is arched outwardly to form an outwardly-arched part (33), and the outwardly-arched part (33) and the assembling recess (32) are oppositely arranged on two sides of the tube body (31) in the axial direction of the five-way tube (20), or the tube wall of the tube body (31) on the other side of the central axis (L) is arched inwardly to form an inwardly-arched part, and the inwardly-arched part and the assembling recess (32) are oppositely arranged on two sides of the tube body (31) in the axial direction of the five-way tube (20), or the tube wall of the tube body (31) on the other side of the central axis (L) is arched outwardly to form an outwardly-arched part (33) and the tube wall of the tube body (31) on the other side of the central axis is arched inwardly to form an inwardly-arched part, and the outwardly-arched part (33) and the inwardly-arched part and the assembling recess (32) are oppositely arranged on two sides of the tube body (31) in the axial direction of the five-way tube (20). A bicycle, comprising the frame (100). By means of the arrangement, the strength and rigidity of a bicycle body can be effectively improved.

Description

Frames and bicycles Technical Field

[0001] The present application relates to the technical field of bicycles, and in particular to a frame and a bicycle. Background Art

[0002] Bicycles, also known as bicycles or bikes, are typically two-wheeled land vehicles. They serve not only as an environmentally friendly means of transportation and travel, but also as fitness equipment for exercise and travel, making them an essential tool for daily commuting and fitness.

[0003] The bicycle comprises a frame, which comprises a main beam tube, a middle tube and a bottom bracket tube, wherein the middle tube is connected to the main beam tube and the bottom bracket tube, wherein the middle tube is used for mounting a saddle.

[0004] In order to install the front derailleur, the right side of the center tube is often recessed. However, the recessed right side of the center tube reduces the strength and rigidity of the center tube, resulting in insufficient strength and rigidity of the center tube, thereby affecting the strength and rigidity of the entire frame. Summary of the Invention

[0005] Based on this, it is necessary to provide a frame and a bicycle that can improve the above problems.

[0006] A vehicle frame comprises a main beam tube, a bottom bracket tube and a middle tube, wherein the middle tube comprises a tube body, and the tube body connects the main beam tube and the bottom bracket tube;

[0007] The tube body has a central axis extending along its extension direction; the tube wall of the tube body on one side of the central axis is concave, so that the outer surface of the tube body forms an assembly groove for assembling the front transmission, and the outer arch of the tube wall of the tube body on the other side of the central axis forms an outer arch portion, and the outer arch portion and the assembly groove are arranged on both sides of the tube body in the axial direction of the bottom bracket tube, or the inner arch of the tube wall of the tube body on the other side of the central axis forms an inner arch portion, and the inner arch portion and the assembly groove are arranged on both sides of the tube body in the axial direction of the bottom bracket tube, or the outer arch of the tube wall of the tube body on the other side of the central axis forms an outer arch portion and the inner arch of the tube wall of the tube body on the other side of the central axis forms an inner arch portion, and the outer arch portion and the inner arch portion and the assembly groove are arranged on both sides of the tube body in the axial direction of the bottom bracket tube.

[0008] In one embodiment, the outer wall of the tube body on the other side of the central axis is arched to form an outer arch portion, and the outer arch portion is an arc-shaped structure, and there is a smooth transition between the outer arch portion and the outer surface of the tube body.

[0009] In one embodiment, the tube wall of the tube body on the other side of the central axis is arched inwardly to form an inner arch portion, and the inner arch portion is an arc-shaped structure, and there is a smooth transition between the inner arch portion and the inner surface of the tube body.

[0010] In one embodiment, the tube wall of the tube body on the other side of the central axis is arched outward to form an outer arch portion, and in the extension direction of the tube body, two ends of the outer arch portion respectively exceed two ends of the assembly groove.

[0011] In one embodiment, the tube wall of the tube body on the other side of the central axis is arched inwardly to form an inner arch portion, and in the extension direction of the tube body, two ends of the inner arch portion respectively exceed two ends of the assembly groove.

[0012] In one embodiment, the tube wall of the tube body on the other side of the central axis is arched outward to form an outer arch portion, and in the circumferential direction of the tube body, two ends of the outer arch portion respectively exceed two ends of the assembly groove.

[0013] In one embodiment, the tube wall of the tube body on the other side of the central axis is arched inwardly to form an inner arch portion, and in the circumferential direction of the tube body, two ends of the inner arch portion respectively exceed two ends of the assembly groove.

[0014] In one embodiment, the outer arch of the tube wall of the tube body on the other side of the central axis forms an outer arch portion, and in the axial direction of the five-way tube, the arch height of the outer arch portion relative to the tube wall of the tube body is greater than the recessed depth of the assembly groove relative to the tube wall of the tube body.

[0015] In one embodiment, the inner arch of the tube wall of the tube body on the other side of the central axis forms an inner arch portion, and in the axial direction of the five-way tube, the arch height of the inner arch portion relative to the tube wall of the tube body is greater than the recessed depth of the assembly groove relative to the tube wall of the tube body.

[0016] In one embodiment, the tube body includes a first tube and a second tube connected to each other, the first tube connecting the main beam tube and the bottom bracket tube, and the second tube protruding from the main beam tube in the extension direction of the tube body; the assembly groove and the outer arch portion are both formed on the first tube, or the assembly groove and the inner arch portion are both formed on the first tube, or the assembly groove, the outer arch portion and the inner arch portion are all formed on the first tube;

[0017] The vehicle frame further includes a reinforcing tube, both ends of which are connected to the second tube and the main beam tube respectively; the second tube, the reinforcing tube and the main beam tube form a triangular support structure.

[0018] In one embodiment, the outer diameter of the first tube gradually increases from one end connected to the main beam tube to the other end connected to the bottom bracket tube;

[0019] The first tube has a middle portion in the extending direction, and the assembly groove is provided in the middle portion of the first tube or at a side of the middle portion close to the five-way tube.

[0020] In one embodiment, the frame further includes a head tube and a support tube, wherein the head tube is connected to an end of the main beam tube away from the middle tube, and both ends of the support tube are respectively connected to the bottom bracket tube and the head tube; the support tube, the main beam tube, the bottom bracket tube, the middle tube and the head tube form a triangular support structure.

[0021] In one embodiment, the middle tube, the five-way tube and the main beam tube are welded to each other.

[0022] In one embodiment, the center tube, the five-way tube and the main beam tube are integrally formed.

[0023] In one embodiment, the frame further includes a rear fork, which is connected to the center tube and the bottom bracket tube, and is used for mounting a rear wheel.

[0024] In one embodiment, when the tube body is cut through a plane perpendicular to the extending direction, the cross-section of the tube body is circular.

[0025] In one embodiment, when the tube body is cut through a plane perpendicular to the extending direction, the cross-section of the tube body is elliptical.

[0026] A bicycle comprises the frame as described above.

[0027] In the above-mentioned frame and bicycle, the outer arch portion on the other side of the tube body is directly opposite the assembly groove on the axis of the bottom bracket tube. In this way, the provision of the outer arch portion and the inner arch portion can offset at least part of the weakening of the strength and rigidity of the center tube caused by the assembly groove. Compared with the frames in the prior art without the outer arch portion and the inner arch portion, the strength and rigidity of the center tube can be effectively improved, thereby enhancing the strength and rigidity of the frame to meet the requirements of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is an axonometric view of a vehicle frame provided in a preferred embodiment of the present application;

[0029] FIG2 is a structural diagram of the frame shown in FIG1 with the front transmission and rear wheel installed;

[0030] FIG3 is a front view of the frame shown in FIG1 ;

[0031] FIG4 is a partial structural diagram of the vehicle frame shown in FIG3 ;

[0032] FIG5 is an axonometric view of the frame shown in FIG1 from another perspective;

[0033] FIG. 6 is an axonometric view of the vehicle frame shown in FIG. 1 from another perspective.

[0034] Explanation of the accompanying reference numerals: 100, frame; 10, main beam tube; 20, bottom bracket tube; 30, middle tube; 31, tube body; 311, first tube; 312, second tube; 32, assembly groove; 33, outer arch; 40, support tube; 50, rear fork; 60, head tube; 70, reinforcement tube; 200, front derailleur; 300, rear wheel; X, axial direction; Z, extension direction; M, circumferential direction; L, center axis. DETAILED DESCRIPTION

[0035] 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.

[0036] In the description of the present application, it should be understood that 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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, and therefore should not be understood as a limitation on the present application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0039] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "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 "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.

[0040] It should be noted that when 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. When 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0041] Referring to FIG1 , one embodiment of the present application provides a bicycle frame 100 comprising a main frame tube 10, a bottom bracket tube 20, and a center tube 30. The center tube 30 connects the main frame tube 10 and the bottom bracket tube 20. The center tube 30 is used to mount a saddle. Specifically, the center tube 30 is connected to the seat tube, to which the saddle is mounted.

[0042] Referring to Figure 2 , the center tube 30 includes a tube body 31, which connects the main beam tube 10 and the five-way tube 20. Referring to Figures 3 and 4 , the tube body 31 has a central axis L extending along an extension direction Z. In some embodiments, the tube body 31 extends in a vertical direction, in which case the extension direction Z of the tube body 31 is parallel to the vertical direction. In other embodiments, the tube body 31 does not extend in a vertical direction, in which case the extension direction Z of the tube body 31 is inclined relative to the vertical direction. It should be noted that the central axis L is the centerline passing through the center of the tube body 31, and the tube body 31 is axisymmetric about the central axis L. In some embodiments, when the tube body 31 is cut through a plane perpendicular to the extension direction Z, the cross-sectional shape formed by the cut is a circular ring. In other embodiments, the cross-sectional shape of the tube body 31 is an elliptical ring. It is conceivable that in other embodiments, the cross-sectional shape of the tube body 31 can also be other axisymmetric shapes, which are not limited here.

[0043] Furthermore, as shown in Figures 3-5 , the wall of the tube body 31 on one side of the central axis L is recessed, forming a mounting groove 32 (see Figure 2 ) on the outer surface of the tube body 31 for mounting the front derailleur 200. The front derailleur 200 is used for shifting bicycle gears. It should be noted that due to the inward recess in the wall of the tube body 31 to form the mounting groove 32, the tube body 31 having the mounting groove 32 is no longer axisymmetric.

[0044] Referring to Figures 3, 4, and 6, the outer arch 33 is formed on the tube wall of the tube body 31 on the other side of the central axis L, or the inner arch 33 is formed on the tube wall of the tube body 31 on the other side of the central axis L, or the outer arch 33 is formed on the tube wall of the tube body 31 on the other side of the central axis L, and the inner arch 33 is formed on the tube wall of the tube body 31 on the other side of the central axis L. That is, the outer arch 33 is arched outward relative to the rest of the tube body 31, and the inner arch is arched inward relative to the rest of the tube body 31. In other words, the location on the tube body 31 where the outer arch 33 or the inner arch is formed forms a thickened portion of the tube body 31. When the outer arch 33 is formed on the tube wall of the tube body 31 on the other side of the central axis L, the outer arch 33 and the mounting groove 32 are located on opposite sides of the tube body 31 in the axial direction X of the bottom bracket sleeve 20. Alternatively, when the inner arch of the tube wall of the tube body 31 on the other side of the central axis L forms an inner arch, the inner arch and the assembly groove 32 are located opposite each other on either side of the tube body 31 in the axial direction X of the bottom bracket tube 20. Alternatively, when the outer arch of the tube wall of the tube body 31 on the other side of the central axis L forms an outer arch 33, and the inner arch of the tube wall of the tube body 31 on the other side of the central axis L forms an inner arch, the outer arch 33 and the assembly groove 32 are located opposite each other on either side of the tube body 31 in the axial direction X of the bottom bracket tube 20, and the inner arch and the assembly groove 32 are located opposite each other on either side of the tube body 31 in the axial direction X of the bottom bracket tube 20. It should be noted that the axial direction X of the bottom bracket tube 20 is also the left-right direction of the frame 100. When the frame 100 is used on a bicycle, the left-right direction of the frame 100 is the left-right direction of the bicycle and is perpendicular to the front-to-back direction and the up-down direction of the bicycle. In the frame 100 provided in the embodiment of the present application, the outer arch 33, or the inner arch, or both the outer arch 33 and the inner arch on the other side of the tube body 31 are directly opposite the assembly groove 32 in the axial direction X of the bottom bracket tube 20. In this way, the provision of the outer arch 33 and the inner arch can offset at least part of the weakening of the strength and rigidity of the center tube 30 caused by the assembly groove 32. Compared with the frame 100 in the prior art without the outer arch 33 and the inner arch, the strength and rigidity of the center tube 30 can be effectively improved, thereby enhancing the strength and rigidity of the frame 100 to meet usage requirements.

[0045] In some embodiments, the outer wall of the tube body 31 on the other side of the central axis L is arched to form an outer arch portion 33, while the inner wall of the tube body 31 does not form an inner arch portion. In other embodiments, the inner wall of the tube body 31 on the other side of the central axis L is arched to form an inner arch portion, while the outer wall of the tube body 31 does not form an outer arch portion 33. In still other embodiments, the outer wall of the tube body 31 on the other side of the central axis L is arched to form an outer arch portion 33, while the inner wall of the tube body 31 on the other side of the central axis L is arched to form an inner arch portion.

[0046] In some embodiments, the outer arch 33 is an arc-shaped structure, with a smooth transition between the outer arch 33 and the outer surface of the tube body 31. This configuration, on the one hand, facilitates the processing of the middle tube 30; on the other hand, the arc-shaped outer arch 33 can reduce the degree of damage to other components caused by collisions with other components.

[0047] Optionally, the inner arch portion is also an arc-shaped structure, and there is a smooth transition between the inner arch portion and the inner surface of the tube body 31 to facilitate the processing of the middle tube 30.

[0048] Furthermore, in the extension direction Z of the tube body 31, the ends of the outer arch 33 respectively extend beyond the ends of the assembly groove 32. That is, the tube body 31 has a first center plane passing through the central axis L and perpendicular to the axial direction X of the bottom bracket 20. In the extension direction Z of the tube body 31, the orthographic projection of the outer arch 33 on the first center plane overlaps the orthographic projection of the assembly groove 32 on the first center plane. In the circumferential direction of the tube body 31, the ends of the outer arch 33 respectively extend beyond the ends of the assembly groove 32. That is, in the circumferential direction of the tube body 31, the orthographic projection of the outer arch 33 on the first center plane overlaps the orthographic projection of the assembly groove 32 on the first center plane. In the radial direction of the bottom bracket 20, the height of the outer arch 33 relative to the tube wall of the tube body 31 is greater than the depth of the assembly groove 32 relative to the tube wall of the tube body 31. It should be noted that the fact that the arch height of the outer arch 33 is greater than the recessed depth of the assembly groove 32 means that the maximum distance between the outer arch 33 and the outer surface of the tube wall of the tube body 31 is greater than the maximum distance between the bottom wall of the assembly groove 32 and the outer surface of the tube wall of the tube body 31. For example, in some specific embodiments, when the outer arch 33 is an arc-shaped structure with a high center and low sides, the distance between the middle portion of the outer arch 33 and the outer surface of the tube wall 31 of the tube body 30 is greater than the maximum distance between the assembly groove 32 and the outer surface of the tube wall of the tube body 31. Generally, the bottom wall of the assembly groove 32 is equidistant from the central axis L at all locations, that is, the recessed depth of the assembly groove 32 is the same at all locations. In this case, the distance between the middle portion of the outer arch 33 and the tube wall 31 of the tube body 30 is greater than the distance between the assembly groove 32 and the tube wall of the tube body 31 at all locations.

[0049] It should also be noted that the height of the arched portion 33 does not interfere with the movement of the crank. In other words, the arrangement of the arched portion 33 does not affect the normal riding of the bicycle.

[0050] When both ends of the outer arch portion 33 extend beyond both ends of the assembly groove 32 in both the extension direction Z and the circumferential direction, and at the same time, the arched height of the outer arch portion 33 is greater than the recessed depth of the assembly groove 32, the outer arch portion 33 can completely offset the weakening of the strength and rigidity of the center tube 30 caused by the assembly groove 32, thereby improving the strength and rigidity of the center tube 30, so that the center tube 30 can reach or exceed the strength and rigidity when the center tube 30 is not provided with the assembly groove 32, thereby improving the strength and rigidity of the entire frame 100.

[0051] Optionally, in the extension direction Z of the tube body 31, the two ends of the inner arch portion respectively exceed the two ends of the assembly groove 32. That is, in the extension direction Z of the tube body 31, the orthographic projection of the inner arch portion on the first center plane covers the orthographic projection of the assembly groove 32 on the first center plane. In the circumferential direction of the tube body 31, the two ends of the inner arch portion respectively exceed the two ends of the assembly groove 32. That is, in the circumferential direction of the tube body 31, the orthographic projection of the inner arch portion on the first center plane covers the orthographic projection of the assembly groove 32 on the first center plane. In the radial direction of the five-way pipe 20, the arch height of the inner arch portion relative to the tube wall of the tube body 31 is greater than the recessed depth of the assembly groove 32 relative to the tube wall of the tube body 31. It should be noted here that the arch height of the inner arch portion being greater than the recessed depth of the assembly groove 32 means that the maximum distance between the inner arch portion and the inner surface of the tube wall of the tube body 31 is greater than the maximum distance between the bottom wall of the assembly groove 32 and the outer surface of the tube wall of the tube body 31.

[0052] When both ends of the inner arch portion extend beyond both ends of the assembly groove 32 in both the extension direction Z and the circumferential direction, and at the same time, the raised height of the inner arch portion is greater than the recessed depth of the assembly groove 32, the inner arch portion can completely offset the weakening of the strength and rigidity of the center tube 30 caused by the assembly groove 32, thereby improving the strength and rigidity of the center tube 30, so that the center tube 30 can reach or exceed the strength and rigidity of the center tube 30 when the assembly groove 32 is not provided, thereby improving the strength and rigidity of the entire frame 100.

[0053] It is conceivable that in other embodiments, the relationship between the ends of the outer arch 33 or inner arch and the mounting groove 32 in the extension direction Z is not limited. For example, the ends of the outer arch 33 or inner arch in the extension direction Z can be respectively flush with the ends of the mounting groove 32, or the ends of the outer arch 33 or inner arch in the extension direction Z can be lower than the ends of the mounting groove 32. Similarly, there is no limitation on the relationship between the ends of the outer arch 33 or inner arch in the circumferential direction of the tube body 31 and the mounting groove 32, nor is there any limitation on the relationship between the raised height of the outer arch 33 or inner arch in the radial direction of the bottom bracket shell 20 and the recessed depth of the mounting groove 32.

[0054] In some embodiments, referring again to FIG. 3 , the tube body 31 includes a first tube 311 and a second tube 312 that are interconnected. The first tube 311 connects the main beam tube 10 and the bottom bracket tube 20, and the second tube 312 protrudes from the main beam tube 10 in the extension direction Z of the tube body 31. The mounting groove 32 and the outer arch 33 are both formed on the first tube 311, or the mounting groove 32 and the inner arch are both formed on the first tube 311, or the mounting groove 32, the outer arch 33, and the inner arch are all formed on the first tube 311. The vehicle frame 100 also includes a reinforcement tube 70, the ends of which are respectively connected to the second tube 312 and the main beam tube 10. The second tube 312, the reinforcement tube 70, and the main beam tube 10 form a triangular support structure. This arrangement can further enhance the strength of the vehicle frame 100.

[0055] It is understandable that in other embodiments, the tube body 31 may omit the second tube 312 and only include the first tube 311 .

[0056] Continuing with Figure 4 , the outer diameter of the first tube 311 gradually increases from one end connected to the main beam tube 10 to the other end connected to the bottom bracket tube 20. The first tube 311 has a middle portion in the extension direction Z. The mounting groove 32 is provided in the middle portion of the first tube 311 or on the side of the middle portion close to the bottom bracket tube 20. This avoids placing the mounting groove 32 in a thinner portion of the first tube 311, thereby ensuring the strength and rigidity of the center tube 30, and thus the strength and rigidity of the frame 100.

[0057] In some embodiments, referring again to FIG. 5 , the frame 100 further includes a support tube 40 and a head tube 60. The head tube 60 is connected to the end of the main beam tube 10 away from the center tube 30. The ends of the support tube 40 are connected to the bottom bracket tube 20 and the head tube 60, respectively. The support tube 40, the main beam tube 10, the bottom bracket tube 20, the center tube 30, and the head tube 60 form a triangular support structure. This further enhances the strength of the frame 100. It is contemplated that in some embodiments, the frame 100 may omit the support tube 40, although this is not intended to be limiting.

[0058] Furthermore, the frame 100 further includes a rear fork 50 , which is connected to the center tube 30 and the bottom bracket 20 for mounting the rear wheel 300 .

[0059] In some embodiments, the center tube 30, bottom bracket tube 20, support tube 40, main beam tube 10, head tube 60, rear fork 50, and reinforcement tube 70 are welded to each other, which facilitates the manufacture of the frame 100 and saves costs. In other embodiments, the center tube 30, bottom bracket tube 20, support tube 40, main beam tube 10, head tube 60, rear fork 50, and reinforcement tube 70 can also be integrally formed.

[0060] Another embodiment of the present application further provides a bicycle including the above-mentioned frame 100. Since the above-mentioned frame 100 has beneficial effects, the bicycle including the above-mentioned frame 100 has the same beneficial effects, which will not be described in detail here.

[0061] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0062] The above-described embodiments merely represent 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, and these modifications and improvements 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 frame, characterized in that: It comprises a main beam tube (10), a bottom bracket tube (20) and a middle tube (30), wherein the middle tube (30) comprises a tube body (31), and the tube body (31) connects the main beam tube (10) and the bottom bracket tube (20); The tube body (31) has a central axis (L) extending along its extension direction (Z); the tube wall of the tube body (31) on one side of the central axis (L) is concave, so that the outer surface of the tube body (31) forms an assembly groove (32) for assembling the front transmission (200); the tube wall of the tube body (31) on the other side of the central axis (L) is arched to form an outer arch portion (33); the outer arch portion (33) and the assembly groove (32) are arranged on both sides of the tube body (31) in the axial direction (X) of the five-way tube (20), or the tube body (31) is located on the central axis. The inner arch of the tube wall on the other side of the axis (L) forms an inner arch portion, and the inner arch portion and the assembly groove (32) are arranged on both sides of the tube body (31) in the axial direction (X) of the five-way tube (20) in a direction opposite to each other, or the outer arch of the tube wall of the tube body (31) on the other side of the central axis (L) forms an outer arch portion (33) and the inner arch of the tube wall of the tube body (31) on the other side of the central axis (L) forms an inner arch portion, and the outer arch portion (33) and the inner arch portion and the assembly groove (32) are arranged on both sides of the tube body (31) in the axial direction (X) of the five-way tube (20) in a direction opposite to each other.

2. The frame according to claim 1, wherein: The outer arch of the tube wall of the tube body (31) on the other side of the central axis (L) forms an outer arch portion (33). The outer arch portion (33) is an arc-shaped structure, and a smooth transition is formed between the outer arch portion (33) and the outer surface of the tube body (31).

3. The frame according to claim 1 or 2, characterized in that: The inner arch of the tube wall of the tube body (31) on the other side of the central axis (L) forms an inner arch portion, and the inner arch portion is an arc-shaped structure, and a smooth transition occurs between the inner arch portion and the inner surface of the tube body (31).

4. The frame according to claim 1, wherein: The outer arch of the tube wall of the tube body (31) on the other side of the central axis (L) forms an outer arch portion (33). In the extension direction (Z) of the tube body (31), two ends of the outer arch portion (33) respectively exceed two ends of the assembly groove (32).

5. The frame according to claim 1 or 4, characterized in that: The tube wall of the tube body (31) on the other side of the central axis (L) is arched to form an inner arch portion, and in the extension direction (Z) of the tube body (31), two ends of the inner arch portion respectively exceed two ends of the assembly groove (32).

6. The frame according to claim 1, wherein: The outer arch of the tube wall of the tube body (31) on the other side of the central axis (L) forms an outer arch portion (33). In the circumferential direction (M) of the tube body (31), two ends of the outer arch portion (33) respectively exceed two ends of the assembly groove (32).

7. The frame according to claim 1 or 6, characterized in that: The tube wall of the tube body (31) on the other side of the central axis (L) is arched to form an inner arch portion, and in the circumferential direction (M) of the tube body (31), two ends of the inner arch portion respectively exceed two ends of the assembly groove (32).

8. The frame according to claim 1, wherein: The outer arch of the tube wall of the tube body (31) on the other side of the central axis (L) forms an outer arch portion (33); in the axial direction (X) of the five-way tube (20), the arch height of the outer arch portion (33) relative to the tube wall of the tube body (31) is greater than the recessed depth of the assembly groove (32) relative to the tube wall of the tube body (31).

9. The frame according to claim 1 or 8, characterized in that: The wall of the tube body (31) located on the other side of the central axis (L) is arched to form an inner arch portion. In the axial direction (X) of the five-way tube (20), the arch height of the inner arch portion relative to the tube wall of the tube body (31) is greater than the recessed depth of the assembly groove (32) relative to the tube wall of the tube body (31).

10. The vehicle frame according to claim 1, wherein: The tube body (31) comprises a first tube (311) and a second tube (312) connected to each other, the first tube (311) connecting the main beam tube (10) and the five-way tube (20), and the second tube (312) protruding from the main beam tube (10) in the extension direction (Z) of the tube body (31); the assembly groove (32) and the outer arch portion (33) are both formed on the first tube (311), or the assembly groove (32) and the inner arch portion are both formed on the first tube (311), or the assembly groove (32), the outer arch portion (33) and the inner arch portion are all formed on the first tube (311); The vehicle frame further comprises a reinforcing tube (70), the two ends of which are respectively connected to the second tube (312) and the main beam tube (10); the second tube (312), the reinforcing tube (70) and the main beam tube (10) form a triangular support structure.

11. The vehicle frame according to claim 10, wherein: The outer diameter of the first tube (311) gradually increases from one end connected to the main beam tube (10) to the other end connected to the five-way tube (20); The first tube (311) has a middle portion in the extension direction (Z), and the assembly groove (32) is provided at the middle portion of the first tube (311) or at a side of the middle portion close to the five-way tube (20).

12. The vehicle frame according to claim 1, wherein: The frame further comprises a head tube (60) and a support tube (40), wherein the head tube (60) is connected to one end of the main beam tube (10) away from the middle tube (30), and the two ends of the support tube (40) are respectively connected to the bottom bracket tube (20) and the head tube (60); the support tube (40), the main beam tube (10), the bottom bracket tube (20), the middle tube (30) and the head tube (60) form a triangular support structure.

13. The vehicle frame according to claim 1, wherein: The middle tube (30), the five-way tube (20) and the main beam tube (10) are welded to each other.

14. The vehicle frame according to claim 1, wherein: The middle tube (30), the five-way tube (20) and the main beam tube (10) are integrally formed.

15. The vehicle frame according to claim 1, wherein: The frame further comprises a rear fork (50), the rear fork (50) being connected to the middle tube (30) and the five-way tube (20), and the rear fork (50) being used for mounting a rear wheel (300).

16. The vehicle frame according to claim 1, wherein: When the tube body (31) is cut through a plane perpendicular to the extension direction (Z), the cross-sectional shape of the tube body (31) is circular.

17. The vehicle frame according to claim 1, wherein: When the tube body (31) is cut through a plane perpendicular to the extension direction (Z), the cross-sectional shape of the tube body (31) is an ellipse.

18. A bicycle, characterized in that: Comprising a frame as described in any one of claims 1-17.

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