A motorcycle frame

Abstract

The present invention provides a motorcycle frame, which belongs to the technical field of motorcycles. It solves the technical problem that it is difficult to conveniently assemble components on existing motorcycle frames. The frame of the motorcycle includes a front frame and a rear frame, the rear end of the front frame is fixedly connected to a crossbeam tube extending in the left-right direction, the rear frame includes a longitudinal beam fixedly connected to the transverse middle part of the crossbeam tube and extending backward, a connecting bracket is connected below the crossbeam, a support tube extending toward the rear and upward is fixedly provided in the transverse middle part of the connecting bracket, the upper end of the support tube is fixedly connected to the longitudinal beam, and an installation cabin for accommodating installation components is formed between the support tube, the longitudinal beam and the connecting bracket. The frame of the motorcycle can make the installation and arrangement of peripheral components more convenient while ensuring strength.

Description

Technical Field

[0001] The invention belongs to the technical field of motorcycles and relates to a frame of a motorcycle. Background Art

[0002] If the engine is the "heart" of a motorcycle, then the frame is the "skeleton" of the motorcycle. The frame is closely related to the handling performance and riding comfort of the motorcycle. The frame supports the engine, provides a fixed position for the steering mechanism and rear shock absorber, carries the rider, passengers and their luggage, and also provides a mounting position for the fuel tank, battery, etc.

[0003] The frame of a general motorcycle includes a front frame and a rear frame. The engine and transmission are mounted below the front frame, so the front frame is generally composed of a pair of left and right frame members. The rear frame can be equipped with ABS units, GPS units, and carbon canisters for recovering evaporated fuel, but the numerous peripheral components make the width of the motorcycle too large in the left and right directions and the assembly is not convenient.

[0004] In order to solve the above-mentioned problem, the patent application with the publication number CN102556243A discloses a motorcycle frame, wherein in a frame (1) having a frame front portion extending rearward from a front pipe (2) and a frame rear portion extending downward and even rearward from a rear end of the frame front portion, the frame front portion is formed by at least left and right paired frame members. On the other hand, the front side portion of the frame rear portion is a waist frame (5) of a closed cross-section structure in which left and right paired steel plates (50, 51) overlap each other, which can ensure sufficient rigidity and facilitate the installation of vehicle equipment such as a carbon canister (7) and an ABS unit (9) on the side of the narrow waist frame (5).

[0005] The above frame structure can ensure that the vehicle body has a narrow width after assembly to a certain extent, but it is still difficult to assemble conveniently when more peripheral components need to be installed. In order to further improve the convenience of assembling peripheral components while ensuring the structural strength, the general technicians in this field will inevitably find it difficult to consider designs that will reduce the structural strength, but they can easily consider the following: 1. Designing the overall size and cross-sectional size of the frame to be larger to ensure strength while increasing the component capacity; 2. Designing and assembling the peripheral components to the rear periphery of the front frame or the rear frame to distribute the component density. Summary of the invention

[0006] The present invention aims at the above-mentioned problems existing in the prior art and provides a frame of a motorcycle. The technical problem to be solved by the present invention is: how to facilitate the installation and arrangement of peripheral components while ensuring the strength.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A motorcycle frame comprises a front frame and a rear frame, wherein the rear end of the front frame is fixedly connected to a cross beam tube extending in the left-right direction, and is characterized in that the rear frame comprises a longitudinal beam fixedly connected to the transverse middle portion of the cross beam tube and extending rearward, a connecting bracket is connected below the cross beam tube, a supporting tube extending rearward and upward is fixedly provided in the transverse middle portion of the connecting bracket, an upper end of the supporting tube is fixedly connected to the longitudinal beam, and an installation compartment for accommodating installation components is formed between the supporting tube, the longitudinal beam and the connecting bracket.

[0009] The front frame of the motorcycle is used to assemble components such as the fuel tank and the engine, and the rear frame is used to assemble components such as the seat cushion, carbon canister, ABS unit, etc. The front frame and the rear frame are fixedly connected by a crossbeam tube to ensure that the structure of the entire frame is integrated and stable. By setting the rear frame to include a longitudinal beam that is fixedly connected to the axial middle part of the crossbeam tube and extends backward, the longitudinal beam and the support tube are both located in the middle part of the width direction of the frame, ensuring that the load they bear can act more directly on the frame structure body. In addition, the transition between the front frame and the rear frame is smoother, which is beneficial for the front frame to participate in load sharing and improve the overall load capacity of the rear frame. At the same time, the longitudinal beam is directly fixedly connected to the crossbeam tube, which is beneficial for designing an increase in the installation height of the seat cushion without changing the size of the frame, thereby increasing the assembly margin under the longitudinal beam; a connecting bracket that can be connected to the crossbeam tube is provided below the crossbeam tube, and a connecting bracket is provided on the connecting bracket. A support tube extending upward and rearward and fixedly connected to the longitudinal beam is arranged, and the support tube and the longitudinal beam are vertically opposite to each other, so that an installation cabin for accommodating installation components is formed between the support tube, the longitudinal beam and the connecting bracket. In this way, an interference-free assembly area can be formed on both sides of the support tube, the longitudinal beam and the connecting bracket. Components such as the carbon canister or the ABS unit will not be interfered by the rear frame during installation, making assembly more convenient, and the installation cabin can further utilize the space between the support tube, the longitudinal beam and the connecting bracket and has a protective effect, is suitable for assembling components that need to be protected and have a long service life, and is more convenient for component arrangement around the rear frame.

[0010] In the frame of the above-mentioned motorcycle, the bottom of the cross beam tube is fixedly connected with a tube column extending downward, the lower end of the tube column is fixedly connected with a second cross tube extending in the left-right direction, and the upper end of the connecting bracket is fixedly connected to the second cross tube. By fixing the tube column at the bottom of the cross beam tube, the lower end of the tube column is fixedly connected to the second cross tube extending in the left-right direction, and the upper end of the connecting bracket is fixedly connected to the second cross tube, so that the cross beam tube and the second cross tube only increase the width dimension of the front end of the rear frame, which can effectively improve the structural strength of the connecting bracket area, thereby ensuring the structural strength of the support tube and the longitudinal beam, and the area where the cross beam tube and the second cross tube face the installation cavity can better protect the components installed there. In addition, since the cross beam tube and the second cross tube are both at the edge of the assembly area, they will not cause obvious interference to the assembly of the components, and thus can further improve the convenience of installation of surrounding components while ensuring strength.

[0011] In the frame of the motorcycle, the size of the connecting bracket along the left-right direction gradually increases from bottom to top, and the left and right sides of the connecting bracket are in an arc shape. By setting the size of the connecting bracket along the left-right direction to gradually increase from bottom to top, and the left and right sides of the connecting bracket are in an arc shape, the transmission stability of the load when passing through the connecting bracket can be ensured, and the phenomenon of structural instability caused by stress concentration can be avoided. In addition, the lower end size of the connecting bracket is smaller and more conducive to the arrangement of components.

[0012] In the frame of the above-mentioned motorcycle, the connecting bracket includes a left and right enclosure plate 1 and an enclosure plate 2, and the enclosure plate 1 and the enclosure plate 2 respectively have through holes that penetrate and face each other in the left and right directions. The lower end of the support tube is located between the enclosure plate 1 and the enclosure plate 2, and the lower end of the support tube is fixedly connected to a mounting shaft extending in the left and right directions, and both ends of the mounting shaft are respectively inserted into the corresponding through holes and fixedly connected to the inner edges of the through holes. By setting a connecting bracket including a left and right enclosing panel 1 and a right and left enclosing panel 2, it is beneficial to reduce the overall weight while ensuring sufficient supporting strength. By setting through holes in the right and left enclosing panels and making the installation shaft extending in the left and right directions fixedly connected to the lower end of the support tube be inserted into the through holes and fixedly connected to the inner edge of the through holes, during the production process, the support tube can first be rotated and matched with the right and left enclosing panels through the installation shaft, and then the swing position of the support tube can be fine-tuned to achieve the most reasonable connection angle with the longitudinal beam, so as to ensure that the surrounding components have sufficient installation dimensions between the support tube and the longitudinal beam, and finally the installation shaft is welded and fixedly connected to the inner edge of the through hole, which can further improve the convenience of assembling the surrounding components.

[0013] In the frame of the motorcycle, the connection bracket has a clearance adjustment hole, the diameter of which is larger than the radial dimension of the support tube, and the support tube passes through the clearance adjustment hole. By providing the clearance adjustment hole on the connection bracket, it is ensured that the support tube can swing smoothly to find the most reasonable fixed position before being fixed to the connection bracket.

[0014] In the frame of the motorcycle, the rear end of the longitudinal beam has a tilted section bent upward relative to the main body of the longitudinal beam, and the upper end surface of the support tube is fixedly connected to the lower surface of the tilted section. By providing the tilted section at the rear end of the longitudinal beam, the extension direction of the tilted section is closer to the extension direction of the support tube, which is conducive to increasing the welding area of ​​the support tube and the longitudinal beam and ensuring the connection strength between the two.

[0015] In the frame of the motorcycle, a reinforcing plate is fixedly connected to the longitudinal beam, the reinforcing plate is U-shaped, the left and right inner walls of the reinforcing plate are respectively fixedly connected to the left and right sides of the longitudinal beam, and the bottom inner wall of the reinforcing plate is fixedly connected to the outer peripheral surface of the upper end of the support tube. By providing a U-shaped reinforcing plate that is simultaneously fixedly connected to the left and right sides of the longitudinal beam and the outer peripheral surface of the upper end of the support tube, the connection effect between the support tube and the longitudinal beam is further improved, and the structural strength is ensured.

[0016] In the frame of the above-mentioned motorcycle, the left and right sides of the rear end of the longitudinal beam are respectively fixedly connected with the tail frame 1 and the tail frame 2, and the tail frame 1 and the tail frame 2 are arranged symmetrically on the left and right sides, and the left and right inner walls of the reinforcing plate are also respectively fixedly connected to the outer side surface of the tail frame 1 and the outer side surface of the tail frame 2, and the bottom inner wall of the reinforcing plate is also fixedly connected to the bottom surface of the tail frame 1 and the bottom surface of the tail frame 2. By respectively fixing the tail frame 1 and the tail frame 2 on the left and right sides of the rear end of the longitudinal beam, the left and right symmetry of the tail frame 1 and the tail frame 2 can cooperate with the front frame to provide more stable support to the longitudinal beam from the front and rear ends, and the left and right inner walls of the reinforcing plate are also respectively fixedly connected to the outer side surface of the tail frame 1 and the outer side surface of the tail frame 2, and the bottom inner wall of the reinforcing plate is also fixedly connected to the bottom surface of the tail frame 1 and the bottom surface of the tail frame 2, so that the reinforcing plate can more stably bind the upper end of the support tube between the reinforcing plate and the bottom surface of the longitudinal beam through the connection effect of multiple dimensions, thereby further improving the structural stability.

[0017] In the frame of the above-mentioned motorcycle, one end of the cross beam tube has a mounting groove for mounting the middle suspension, and the two pipe columns are respectively fixedly connected to the left and right ends of the second cross beam tube, the upper end of the pipe column close to the mounting groove is located in front of the mounting groove and is fixedly connected to the outer peripheral surface of the cross beam tube, and the other pipe column extends along the radial direction of the cross beam tube and is arranged in a staggered manner along the front-to-back direction with the pipe column close to the mounting groove. By setting two pipe columns fixedly connected between the second cross tube and the cross beam tube, the upper end of the pipe column close to the mounting groove is located in front of the mounting groove and is fixedly connected to the outer peripheral surface of the cross beam tube, and the other pipe column extends in the radial direction of the cross beam tube and is arranged in a staggered manner along the front-to-back direction with the pipe column close to the mounting groove, so that the mounting groove will be supported by the middle suspension, and the pipe column close to the mounting groove deviates from the cross beam tube under the condition of ensuring that the installation of the middle suspension is not interfered, so that the force on both sides of the frame remains relatively stable, further improving the force stability and assembly convenience.

[0018] In the frame of the motorcycle, the longitudinal beam is a square tube and the support tube is a round tube. The longitudinal beam is a square tube to ensure a more stable welding effect with the surrounding frame, and the support tube is a round tube to ensure a better vertical force support effect and not easy to bend and deform.

[0019] Compared with the prior art, the advantages of the present invention are as follows:

[0020] The frame of the motorcycle is provided with a rear frame including a longitudinal beam fixedly connected to the axial middle part of the cross beam tube and extending rearward, a connecting bracket which can be connected to the cross beam tube is provided below the cross beam tube, a supporting tube extending toward the upper rear and fixedly connected to the longitudinal beam is provided on the connecting bracket, the supporting tube and the longitudinal beam are vertically opposite to each other, so that an installation cabin for accommodating installation components is formed between the supporting tube, the longitudinal beam and the connecting bracket, so that non-interference assembly areas can be formed on the left and right sides of the supporting tube, the longitudinal beam and the connecting bracket, and components such as the carbon canister or the ABS unit will not be interfered by the rear frame during installation, making the assembly more convenient, and the installation cabin can further utilize the space between the supporting tube, the longitudinal beam and the connecting bracket and has a protective effect, is suitable for assembling components that need to be protected and have a long service life, and is more convenient for arranging components around the rear frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the frame of the motorcycle.

[0022] Figure 2 It is a front structural schematic diagram of the frame of the motorcycle.

[0023] Figure 3 It is a schematic diagram of the structure of the frame of the motorcycle from a top view.

[0024] In the figure, 1, front frame;

[0025] 2. rear frame; 21. longitudinal beam; 211. tilting section;

[0026] 3. Beam tube; 31. Mounting slot;

[0027] 4. Connecting bracket; 41. Enclosure 1; 42. Enclosure 2; 43. Through hole; 44. Adjustment hole for making way;

[0028] 5. Support pipe; 6. Installation cabin; 7. Pipe column; 8. Second cross pipe; 9. Installation shaft; 10. Reinforcement plate; 11. Tail frame one; 12. Tail frame two. DETAILED DESCRIPTION

[0029] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0030] like Figure 1-3As shown, the frame of the motorcycle includes a front frame 1 and a rear frame 2. The rear end of the front frame 1 is fixedly connected with a cross beam tube 3 extending in the left-right direction. The rear frame 2 includes a longitudinal beam 21 fixedly connected to the transverse middle of the cross beam tube 3 and extending backward. A connecting bracket 4 is connected below the cross beam tube 3. A supporting tube 5 extending toward the rear and upward is fixedly provided at the transverse return head of the connecting bracket 4. The upper end of the supporting tube 5 is fixedly connected with the longitudinal beam 21. The vertical projection of the longitudinal beam 21 coincides with the vertical projection of the supporting tube 5. An installation compartment 6 for accommodating the installation components is formed between the supporting tube 5, the longitudinal beam 21 and the connecting bracket 4. The front frame 1 of the motorcycle is used to assemble components such as the fuel tank and the engine, and the rear frame 2 is used to assemble components such as the seat cushion, the carbon canister, the ABS unit, etc. The front frame 1 and the rear frame 2 are fixedly connected by the cross beam tube 3 to ensure that the structure of the entire frame is integrated and stable. The longitudinal beam 21 is a square pipe, and the supporting tube 5 is a round pipe. Setting the longitudinal beam 21 as a square pipe can ensure that the welding effect with the surrounding frame is more stable, and setting the support tube 5 as a round pipe can ensure that its vertical force support effect is better and not easy to bend and deform. By setting the rear frame 2 to include a longitudinal beam 21 that is fixedly connected to the axial middle part of the cross beam tube 3 and extends backward, the longitudinal beam 21 and the support tube 5 are both located in the middle of the width direction of the frame, ensuring that the load they bear can act more directly on the frame structure body. In addition, the transition between the front frame 1 and the rear frame 2 is smoother, which is beneficial for the front frame 1 to participate in load sharing and improve the overall load capacity of the rear frame 2. At the same time, the longitudinal beam 21 is directly fixedly connected to the cross beam tube 3, which is beneficial for designing an increase in the installation height of the seat cushion without changing the size of the frame, and increasing the assembly margin below the longitudinal beam 21; a connecting bracket 4 that can be connected to the cross beam tube 3 is provided below the cross beam tube 3, and a connecting bracket 4 is provided on the connecting bracket 4. The support tube 5 extends upward and rearward and is fixedly connected to the longitudinal beam 21. The support tube 5 and the longitudinal beam 21 are vertically opposite to each other, so that an installation cabin 6 for accommodating installation components is formed between the support tube 5, the longitudinal beam 21 and the connecting bracket 4. In this way, an assembly area without interference can be formed on both sides of the support tube 5, the longitudinal beam 21 and the connecting bracket 4. Components such as the carbon canister or the ABS unit will not be interfered by the rear frame 2 during installation, making assembly more convenient. The installation cabin 6 can further utilize the space between the support tube 5, the longitudinal beam 21 and the connecting bracket 4 and has a protective effect. It is suitable for assembling components that need to be protected and have a long service life, and is more convenient for arranging components around the rear frame 2. Further, the bottom of the cross beam tube 3 is fixedly connected to a pipe column 7 extending downward, and the lower end of the pipe column 7 is fixedly connected to a second cross tube 8 extending in the left-right direction, and the upper end of the connecting bracket 4 is fixedly connected to the second cross tube 8.By fixing the pipe column 7 at the bottom of the cross beam tube 3, the lower end of the pipe column 7 is fixedly connected to the second cross tube 8 extending in the left and right directions, and the upper end of the connecting bracket 4 is fixedly connected to the second cross tube 8. In this way, the cross beam tube 3 and the second cross tube 8 only increase the width dimension of the front end of the rear frame 2, which can effectively improve the structural strength of the connecting bracket 4 area, thereby ensuring the structural strength of the support tube 5 and the longitudinal beam 21, and the area where the cross beam tube 3 and the second cross tube 8 are opposite to the installation cavity can better protect the components installed there. In addition, since the cross beam tube 3 and the second cross tube 8 are both at the edge of the assembly area, they will not cause obvious interference to the assembly of the components, thereby further improving the convenience of installation of surrounding components while ensuring strength. One end of the cross beam tube 3 has a mounting groove 31 for mounting the middle suspension. There are two pipe columns 7, which are respectively fixed to the left and right ends of the second cross pipe 8. The upper end of the pipe column 7 close to the mounting groove 31 is located in front of the mounting groove 31 and is fixed to the outer peripheral surface of the cross beam tube 3. The other pipe column 7 extends in the radial direction of the cross beam tube 3 and is staggered with the pipe column 7 close to the mounting groove 31 in the front-to-back direction. By setting two pipe columns 7 fixedly connected between the second cross pipe 8 and the cross beam tube 3, the upper end of the pipe column 7 close to the mounting groove 31 is located in front of the mounting groove 31 and is fixed to the outer peripheral surface of the cross beam tube 3. The other pipe column 7 extends in the radial direction of the cross beam tube 3 and is staggered with the pipe column 7 close to the mounting groove 31 in the front-to-back direction. In this way, the mounting groove 31 will be supported by the middle suspension. The pipe column 7 close to the mounting groove 31 deviates from the cross beam tube 3 under the condition of ensuring that the installation of the middle suspension is not interfered, so that the force on both sides of the frame remains relatively stable, further improving the force stability and assembly convenience. Preferably, the size of the connecting bracket 4 along the left-right direction gradually increases from bottom to top, and the left and right sides of the connecting bracket 4 are in an arc shape. By setting the size of the connecting bracket 4 along the left-right direction to gradually increase from bottom to top, and the left and right sides of the connecting bracket 4 are in an arc shape, the transmission stability of the load when passing through the connecting bracket 4 can be ensured, and the phenomenon of structural instability caused by stress concentration can be avoided. In addition, the smaller size of the lower end of the connecting bracket 4 is also more conducive to the arrangement of components.

[0031] like Figure 1As shown, the connecting bracket 4 includes a left and right enclosure plate 1 41 and a second enclosure plate 42, and the enclosure plate 1 41 and the second enclosure plate 42 respectively have through holes 43 that penetrate and face each other along the left and right directions. The lower end of the support tube 5 is located between the enclosure plate 1 41 and the second enclosure plate 42, and the lower end of the support tube 5 is fixedly connected with a mounting shaft 9 extending in the left and right directions. Both ends of the mounting shaft 9 are respectively inserted into the corresponding through holes 43 and fixedly connected to the inner edges of the through holes 43. By setting the connecting bracket 4 to include the left and right enclosing panels 1 41 and 2 42, it is beneficial to reduce the overall weight while ensuring sufficient support strength. By setting through holes 43 on the panels 1 41 and 2 42, and inserting the installation shaft 9 extending in the left and right directions fixedly connected to the lower end of the support tube 5 into the through holes 43 and fixedly connected to the inner edge of the through holes 43, the support tube 5 can be firstly rotated and matched with the panels 1 41 and 2 42 through the installation shaft 9 during the production process, and then the swing position of the support tube 5 is fine-tuned to achieve the most reasonable connection angle with the longitudinal beam 21, so as to ensure that the peripheral components can have sufficient installation dimensions between the support tube 5 and the longitudinal beam 21, and finally the installation shaft 9 is welded and fixedly connected to the inner edge of the through hole 43, so as to further improve the convenience of assembling the peripheral components. Further, the connecting bracket 4 has a clearance adjustment hole 44, the diameter of which is larger than the radial dimension of the support tube 5, and the support tube 5 passes through the clearance adjustment hole 44. By providing the adjustment hole for making way on the connection bracket 4 , it can be ensured that the support tube 5 can swing smoothly to find the most reasonable fixing position before being fixedly connected with the connection bracket 4 .

[0032] like Figure 1-3As shown, the rear end of the longitudinal beam 21 has a tilted section 211 bent upward relative to the body of the longitudinal beam 21, and the upper end surface of the support tube 5 is adapted and fixedly connected to the lower surface of the tilted section 211. By arranging the tilted section 211 at the rear end of the longitudinal beam 21, the extension direction of the tilted section 211 is closer to the extension direction of the support tube 5, which is conducive to increasing the welding area between the support tube 5 and the longitudinal beam 21 and ensuring the connection strength between the two. A reinforcing plate 10 is fixedly connected to the longitudinal beam 21. The reinforcing plate 10 is U-shaped. The left and right inner walls of the reinforcing plate 10 are respectively fixedly connected to the left and right sides of the longitudinal beam 21, and the bottom inner wall of the reinforcing plate 10 is fixedly connected to the outer peripheral surface of the upper end of the support tube 5. By arranging the U-shaped reinforcing plate 10 to be fixedly connected to the left and right sides of the longitudinal beam 21 and the outer peripheral surface of the upper end of the support tube 5 at the same time, the connection effect of the support tube 5 and the longitudinal beam 21 is further improved to ensure the structural strength. Preferably, the left and right sides of the rear end of the longitudinal beam 21 are respectively fixedly connected to the tail frame 11 and the tail frame 2 12, and the tail frame 11 and the tail frame 2 12 are arranged symmetrically on the left and right sides. The left and right inner walls of the reinforcing plate 10 are also respectively fixedly connected to the outer side surfaces of the tail frame 11 and the outer side surfaces of the tail frame 2 12, and the bottom inner wall of the reinforcing plate 10 is also fixedly connected to the bottom surfaces of the tail frame 11 and the bottom surfaces of the tail frame 2 12. By respectively connecting the tail frame 11 and the tail frame 2 12 on the left and right sides of the rear end of the longitudinal beam 21, the tail frame 1 11 and the tail frame 2 12 are symmetrical on the left and right sides and can cooperate with the front frame 1 to provide more stable support for the longitudinal beam 21 from the front and rear ends. By setting the left and right inner walls of the reinforcing plate 10, they are also respectively connected to the outer side surfaces of the tail frame 11 and the outer side surfaces of the tail frame 2 12, and the bottom inner wall of the reinforcing plate 10 is also fixed to the bottom surfaces of the tail frame 11 and the bottom surfaces of the tail frame 2 12. In this way, the reinforcing plate 10 can more stably bind the upper end of the support tube 5 between the reinforcing plate 10 and the bottom surfaces of the longitudinal beam 21 through the connection effect of multiple dimensions, thereby further improving the structural stability.

[0033] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A motorcycle frame, comprising a front frame (1) and a rear frame (2), wherein a cross beam tube (3) extending in a left-right direction is fixedly connected to the rear end of the front frame (1), characterized in that: The rear frame (2) comprises a longitudinal beam (21) fixedly connected to the transverse middle portion of the cross beam tube (3) and extending rearward, a connecting bracket (4) is connected below the cross beam tube (3), a supporting tube (5) extending rearward and upward is fixedly provided in the transverse middle portion of the connecting bracket (4), the upper end of the supporting tube (5) is fixedly connected to the longitudinal beam (21), and an installation compartment (6) for accommodating installation components is formed between the supporting tube (5), the longitudinal beam (21) and the connecting bracket (4); the connecting bracket (4) comprises a first enclosure (41) and a second enclosure (42) enclosing each other on the left and right, the first enclosure (41) and the enclosure (42) being arranged on the left and right sides. The two (42) respectively have through holes (43) that penetrate in the left-right direction and face each other. The lower end of the support tube (5) is located between the enclosure plate one (41) and the enclosure plate two (42). The lower end of the support tube (5) is fixedly connected to a mounting shaft (9) extending in the left-right direction. The two ends of the mounting shaft (9) are respectively inserted into the corresponding through holes (43) and fixedly connected to the inner edge of the through hole (43). The connecting bracket (4) has a clearance adjustment hole (44). The diameter of the clearance adjustment hole (44) is larger than the radial dimension of the support tube (5). The support tube (5) passes through the clearance adjustment hole (44).

2. The motorcycle frame according to claim 1, characterized in that: A tube column (7) extending downward is fixedly connected to the bottom of the cross beam tube (3), a second cross tube (8) extending in the left-right direction is fixedly connected to the lower end of the tube column (7), and the upper end of the connecting bracket (4) is fixedly connected to the second cross tube (8).

3. The motorcycle frame according to claim 1, characterized in that: The size of the connecting bracket (4) in the left-right direction gradually increases from bottom to top, and the left and right sides of the connecting bracket (4) are in the shape of curved surfaces.

4. The motorcycle frame according to claim 1, 2 or 3, characterized in that: The rear end of the longitudinal beam (21) has a raised section (211) bent upward relative to the body of the longitudinal beam (21), and the upper end surface of the support tube (5) is abutted and fixedly connected to the lower surface of the raised section (211).

5. The motorcycle frame according to claim 1, 2 or 3, characterized in that: A reinforcing plate (10) is fixedly connected to the longitudinal beam (21), the reinforcing plate (10) being U-shaped, the left and right inner walls of the reinforcing plate (10) being respectively fixedly connected to the left and right sides of the longitudinal beam (21), and the bottom inner wall of the reinforcing plate (10) being fixedly connected to the outer peripheral surface of the upper end of the support tube (5).

6. The motorcycle frame according to claim 5, characterized in that: A tail frame 1 (11) and a tail frame 2 (12) are respectively fixedly connected to the left and right sides of the rear end of the longitudinal beam (21), and the tail frame 1 (11) and the tail frame 2 (12) are arranged symmetrically on the left and right sides. The left and right inner walls of the reinforcing plate (10) are also respectively fixedly connected to the outer side surface of the tail frame 1 (11) and the outer side surface of the tail frame 2 (12), and the bottom inner wall of the reinforcing plate (10) is also fixedly connected to the bottom surface of the tail frame 1 (11) and the bottom surface of the tail frame 2 (12).

7. The motorcycle frame according to claim 2, characterized in that: One end of the cross beam tube (3) has a mounting groove (31) for mounting a central suspension, two pipe columns (7) are respectively fixedly connected to the left and right ends of the second cross tube (8), the upper end of the pipe column (7) close to the mounting groove (31) is located in front of the mounting groove (31) and is fixedly connected to the outer peripheral surface of the cross beam tube (3), and the other pipe column (7) extends in the radial direction of the cross beam tube (3) and is staggered with the pipe column (7) close to the mounting groove (31) in the front-rear direction.

8. The motorcycle frame according to claim 1, 2 or 3, characterized in that: The longitudinal beam (21) is a square tube, and the support tube (5) is a round tube.

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