Adjustment mechanism for adjusting the length of the motorcycle frame

Abstract

This invention discloses an adjustment mechanism for adjusting the length of a motorcycle frame, comprising: a frame assembly, mounted on the motorcycle body structure to form a load-bearing position, the frame assembly including a front frame and a rear frame, the rear frame being slidably connected to the front frame in the longitudinal direction of the motorcycle body; a locking assembly, mounted on the frame assembly, used to lock the rear frame after it has slid into place; and a reinforcing assembly, mounted on the frame assembly, forming a triangular reinforcing structure below the front and rear frames that can move together with the rear frames. The adjustment mechanism structure for adjusting the length of a motorcycle frame provided by this invention can adjust the frame length, and after being installed on a motorcycle, it can meet the usage requirements of different groups of people and users after temporary changes; the overall frame after lengthening still has sufficient strength to ensure service life and safety; the overall frame structure meets the lightweight design requirements of vehicle manufacturing; the assembly structure is simple to adjust and compact in structure.

Description

Technical Field

[0001] This invention belongs to the field of motorcycle structural technology, specifically relating to an adjustment mechanism for adjusting the length of a motorcycle frame. Background Technology

[0002] The main load-bearing component of a motorcycle is its frame, which is generally a steel tubular frame structure. Different load-bearing areas are formed on the frame, such as the rear seat area for the user. These load-bearing structures need to meet certain structural strength requirements to ensure the motorcycle's lifespan and safety performance. Therefore, current motorcycle frame structures are generally fixed, especially in length, which cannot be adjusted. Such a structure cannot meet the changing needs of different users, such as varying user sizes, different numbers of passengers, or the need to carry items.

[0003] Therefore, there is an urgent need to design a frame assembly structure that allows for length adjustment while ensuring structural strength during the lengthening process. This structure is primarily designed for motorcycles and, when installed on a motorcycle, can meet the usage requirements of different groups of people and users after temporary changes. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an adjustment mechanism that can adjust the length while ensuring the structural strength of the frame during length adjustment, and can meet the usage requirements of different groups of people and users after temporary changes when installed on a motorcycle.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adjustment mechanism for adjusting the length of a motorcycle frame, for mounting onto the motorcycle body structure to form a load-bearing position, comprising: a front frame and a rear frame, wherein the front frame is fixedly connected to the motorcycle frame, and the rear frame is slidably connected to the front frame in the longitudinal direction of the motorcycle body; a locking assembly, mounted on the frame assembly, for locking the rear frame after it has slid into place; and a reinforcing assembly, mounted on the frame assembly, and having a triangular reinforcing structure formed below the front and rear frames that can move together with the rear frame.

[0006] Furthermore, the reinforcing assembly includes a front reinforcing plate and a rear reinforcing plate. The front reinforcing plate is hinged to the lower part of the front end of the front frame, and the rear reinforcing plate is hinged to the lower part of the rear end of the rear frame. The front and rear reinforcing plates are hinged to form a linked triangular reinforcing structure.

[0007] Furthermore, the reinforcing assembly also includes a spring-loaded locking mechanism I mounted on the side of the front reinforcing plate. The front reinforcing plate is provided with an upward and rearward opening U-shaped groove, and the rear reinforcing plate is slidably disposed within the U-shaped groove. The spring-loaded locking mechanism I includes a locking pin I, which transversely penetrates the front and rear reinforcing plates, forming a hinged connection between the front and rear reinforcing plates. The rear reinforcing plate is provided with a guide groove I, and when the locking pin I is pulled up, it remains confined within the guide groove I, and the locking pin I can be driven to slide relative to the guide groove I.

[0008] Furthermore, the front frame includes a left front frame tube, a right front frame tube, a horizontal front frame tube I, and a horizontal front frame tube II. The left front frame tube and the right front frame tube are arranged parallel to each other in the front-rear direction relative to the vehicle body. The horizontal front frame tube I and the horizontal front frame tube II are fixedly connected between the left front frame tube and the right front frame tube in parallel to form a U-shaped front frame structure. The rear frame includes a U-shaped tube, and the two arms of the U-shaped tube are correspondingly slidably fitted inside the left front frame tube and the right front frame tube.

[0009] Furthermore, the front frame also includes a front frame reinforcing tube parallel to the left and right tubes of the front frame. The front end of the front frame reinforcing tube is fixedly connected to the front frame horizontal tube I, and the rear end of the front frame reinforcing tube is fixedly connected to the front frame horizontal tube II. The rear frame also includes a rear frame horizontal tube and a rear frame reinforcing tube. The two ends of the rear frame horizontal tube are fixedly connected to the two arms of the U-shaped tube, respectively. The rear end of the rear frame reinforcing tube is fixedly connected to the rear frame horizontal tube and extends forward to be fitted inside the front frame reinforcing tube.

[0010] Furthermore, the front ends of both the left and right front frame tubes are bent downwards and extended to form bent connecting sections suitable for connection with the vehicle body structure.

[0011] Furthermore, a bending reinforcement rib for strengthening the bending point is fixedly connected to the lower part of the bending connection section.

[0012] Furthermore, the locking assembly includes a locking plate and a spring-loaded locking mechanism II. The rear end of the locking plate is fixedly connected to the rear frame and has two locking holes along the front-rear direction of the vehicle body. The spring-loaded locking mechanism II is fixedly installed on the front frame and includes a locking pin II. The locking pin II can be driven to insert into the corresponding locking hole to lock the position of the rear frame.

[0013] Furthermore, the locking plate and the spring latch mechanism II are respectively installed at the central positions on the upper part of the front frame and the rear frame.

[0014] Furthermore, the locking plate is provided with a guide groove II between the two locking holes. When the locking pin II is pulled up, it is still confined within the guide groove II, and the locking pin II can be driven to slide relative to the guide groove II.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The adjustment mechanism structure for adjusting the length of a motorcycle frame provided by the present invention can adjust the frame length. After being installed on a motorcycle, it can meet the usage requirements of different groups of people and users after temporary changes, such as different user weights or different number of passengers.

[0017] 2. The overall frame, even after being lengthened, still possesses sufficient strength to ensure service life and safety;

[0018] 3. Easy to manufacture and install, unlike a separate frame, reducing the difficulty of frame manufacturing; suitable for various models such as scooters, underbone motorcycles, motorcycles, and cruisers;

[0019] 4. The overall structure is a frame structure, which meets the lightweight design requirements for vehicle manufacturing;

[0020] 5. The assembly has a simple and compact structure that is easy to adjust.

[0021] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0023] Figure 2 This is a top view of the structure of the present invention.

[0024] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA

[0025] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure at the middle BB point

[0026] Figure 5 This is a schematic diagram of the main structure of the present invention in its shortened state.

[0027] Figure 6 for Figure 5 Cross-sectional view of the structure at the CC position

[0028] Figure 7This is a schematic diagram of the overall structure of the present invention assembled onto the vehicle frame.

[0029] Reference numerals: 1-Front frame; 101-Left tube of front frame; 101a-Bent connecting section; 101b-Reinforcing rib of bent section; 102-Right tube of front frame; 103-Horizontal tube I of front frame; 104-Horizontal tube II of front frame; 105-Middle reinforcing tube of front frame; 2-Rear frame; 201-U-shaped tube; 202-Horizontal tube of rear frame; 203-Middle reinforcing tube of rear frame; 3-Locking assembly; 301-Locking plate; 301a-Locking hole; 301b-Guide groove II; 302-Spring pin mechanism II; 302a-Clamping pin II; 302b-Cover II; 302c-Cable II; 302d-Sleeve II; 4-Reinforcing assembly; 401-Front reinforcing plate; 402-Rear reinforcing plate; 402a-Guide groove I; 402-Limiting hole; 403-Spring clamping mechanism I; 403a-Clamping pin I; 403b-Sleeve I; 403c-Cover I; 403d-Mounting bracket I; 403e-Cable I; 5-Rear shock absorber mounting bracket; 6-Frame body; 601-Seat support tube. Detailed Implementation

[0030] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only for illustrating the basic concept of the present invention; in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] Please see Figure 1-7 An adjustment mechanism for adjusting the length of a motorcycle frame is used to install onto the motorcycle body structure to form a load-bearing position. The installation can be completed by welding, snap-fitting, screwing, flange connection, etc. For example, it can be installed at the rear of the frame as a load-bearing position for carrying people or goods. A seat is usually installed above the frame assembly. For example, a seat support tube 601 is formed on the frame body 6. The seat support tube 601 and the frame assembly can be used to install a seat.

[0032] Includes: a front frame 1 and a rear frame 2, wherein the rear frame 2 can run along the front-rear direction of the vehicle body (i.e., based on the attachment). Figure 1 The frame is slidably connected to the front frame 1 in the left and right directions. The overall frame structure meets the lightweight design requirements of vehicle manufacturing. The sliding adjustment method and compact structure make it easy to adjust the frame length.

[0033] Locking component 3 is installed on the frame component and is used to lock the rear frame 2 after it has slid into place. It is simple to operate and the locking is reliable.

[0034] Reinforcing component 4 is installed on the frame assembly and forms a triangular reinforcing structure below the front frame 1 and rear frame 2, which can be linked with the rear frame 2. Specifically, the triangular reinforcing structure formed below can enhance the overall resistance to bending deformation, thereby ensuring that the lengthened frame has sufficient load-bearing capacity. At the same time, the linked triangular reinforcing structure can adapt to changes in frame length and better achieve strength enhancement. In addition, this frame structure is easy to manufacture and install, unlike the separate manufacturing of the frame, reducing the difficulty of frame manufacturing. It has a wide range of applications and can be used for various models such as scooters, underbone motorcycles, motorcycles, and cruisers.

[0035] In this embodiment, the reinforcing component 4 includes a front reinforcing plate 401 and a rear reinforcing plate 402. The front reinforcing plate 401 is hinged to the lower part of the front end of the front frame 1, and the rear reinforcing plate 402 is hinged to the lower part of the rear end of the rear frame 2. The front reinforcing plate 401 and the rear reinforcing plate 402 are hinged to form a linked triangular reinforcing structure. Here, "front" and "rear" refer to the components attached to the front frame 1. Figure 1 The left and right directions, that is, the front and rear directions of the vehicle body; in this structural design, the triangular structure formed by the three-point hinge can move together with the rear frame 2 after the rear frame 2 is unlocked, and can form a stable triangular reinforcement structure when the rear frame 2 is locked, which is simple in structure; at the same time, by setting the hinge point of the front reinforcement plate 401 to the front end of the front frame 1 and the hinge point of the rear reinforcement plate 402 to the rear end of the rear frame 2, the triangular structure formed can be structurally reinforced along the entire length of the frame, with good reinforcement effect, while not affecting the sliding arrangement of the rear frame 2.

[0036] In this embodiment, the reinforcing component 4 further includes a spring-loaded latch mechanism I 403 mounted on the side of the front reinforcing plate 401. The front reinforcing plate 401 is provided with a U-shaped groove 401a that opens upward and backward, pointing upward based on the attached... Figure 1 Above is the upper part. The rear reinforcing plate 402 is slidably disposed in the U-shaped slide groove 401a. It is generally engaged in the U-shaped slide groove 401a. Here, "sliding" means being driven to slide along the length direction of the U-shaped slide groove 401a. In order to ensure smooth sliding, the width of the engagement part of the rear reinforcing plate 402 is slightly smaller than the groove width of the U-shaped slide groove 401a. The spring locking mechanism I 403 is used for easy adjustment. The spring locking mechanism I 403 includes a locking pin I 403a, which transversely passes through the front reinforcing plate 401 and the rear reinforcing plate 402. The locking pin I 403a forms a hinged connection between the front reinforcing plate 401 and the rear reinforcing plate 402.

[0037] This structural design ensures that when the rear frame 2 slides forward and shortens, both the front reinforcing plate 401 and the rear reinforcing plate 402 move upward (for comparison). Figure 3 and Figure 6 This allows for a more compact and aesthetically pleasing vertical spatial arrangement, facilitating the placement of other components, such as the rear wheel assembly, while also simplifying the structure.

[0038] The rear reinforcing plate 402 is provided with a guide groove I 402a. When the locking pin I 403a is pulled up, it remains confined within the guide groove I 402a, and the locking pin I 403a can be driven to slide relative to the guide groove I 402a. That is, when the frame length needs to be adjusted, pulling up the locking pin I releases the locking of the hinge point between the front reinforcing plate 401 and the rear reinforcing plate 402. However, the pulling distance cannot be too far, and part of it still needs to be engaged with the guide groove I 402a to ensure that the front reinforcing plate 401 and the rear reinforcing plate 402 do not... It will loosen. By setting the guide slide groove I 402a, it can be ensured that the locking pin I 403a can move within the guide slide groove I 402a without locking up and being unable to slide. At the same time, in order to make the mechanism run more smoothly, limiting holes 402b are provided at both ends of the guide slide groove I 402a, and the pin head of the locking pin I 403a is made into a stepped shape with a smaller front and a larger back. When locked, the larger section of the pin head is locked into the limiting hole 402b. When sliding, the smaller section of the pin head is limited within the guide slide groove I 402a and moves.

[0039] The spring-loaded locking mechanism I403 here also includes the following structures: sleeve I403b, cover I403c, spring I, cable I403e, and mounting bracket I403d. Mounting bracket I403d is fixedly connected to the side of the front reinforcing plate 401. Sleeve I403b is fixedly connected to mounting bracket I403d. Cover I403c is threadedly connected to sleeve I403b. Spring I and locking pin I403a are slidably fitted inside sleeve I403b. One end of cable I403e is fixedly connected to locking pin I403a, and the other end passes through cover I403c and is led out. In use, pulling cable I will pull up locking pin I403a. Compared with the traditional spring-loaded locking structure, by setting the driving method of cable I, when arranging the motorcycle frame, cable I403e can generally be bent and extended to a position suitable for operation, which simplifies the operation and makes it easier to operate.

[0040] In this embodiment, the front frame 1 includes a left front frame tube 101, a right front frame tube 102, a front frame horizontal tube I 103, and a front frame horizontal tube II 104. The left front frame tube 101 and the right front frame tube 102 are arranged parallel to each other in the longitudinal direction relative to the vehicle body. The front frame horizontal tube I 103 and the front frame horizontal tube II 104 are fixedly connected parallel to each other between the left front frame tube 101 and the right front frame tube 102 to form a U-shaped front frame structure. The structure is compact and can facilitate the provision of mounting points, such as at the two transverse ends of the front frame horizontal tube I 103. The rear shock absorber mounting bracket 5 is installed to facilitate the installation of the motorcycle's rear shock absorber. All fixed connections here can be made by welding. The rear frame 2 includes a U-shaped tube 201, which can be a single piece or welded from multiple tube segments. The two sides of the U-shaped tube 201 are fitted into the sliding inner sleeves of the left tube 101 and the right tube 102 of the front frame. This structure is compact and facilitates relative movement between the front frame 1 and the rear frame 2, thereby achieving length adjustment. At the same time, the sliding inner sleeves on both sides ensure smooth sliding and reliable connection.

[0041] In this embodiment, the front frame 1 further includes a front frame reinforcing tube 105 parallel to the front frame left tube 101 and front frame right tube 102. The front end of the front frame reinforcing tube 105 is fixedly connected to the front frame horizontal tube I 103, and the rear end of the front frame reinforcing tube 105 is fixedly connected to the front frame horizontal tube II 104, such as by welding. The rear frame further includes a rear frame horizontal tube 202 and a rear frame reinforcing tube 203. The two ends of the rear frame horizontal tube 202 are respectively fixedly connected to the two sides of the U-shaped tube 201, such as by welding. The rear end of the rear frame reinforcing tube 203 is fixedly connected to the rear frame horizontal tube 202 and extends forward to be sleeved inside the front frame reinforcing tube 105. In this structural design, the structural strength of the frame itself can be enhanced by adding the corresponding rear frame reinforcing tube 203 and front frame reinforcing tube 105, and the overall structural strength of the frame is enhanced due to the additional inner sleeve connection point.

[0042] Meanwhile, by setting the reinforcing tube 203 in the rear frame and the reinforcing tube 105 in the front frame, it is convenient to provide mounting points for the front reinforcing plate 401 and the rear reinforcing plate 402. Generally, the reinforcing tube 203 in the rear frame and the reinforcing tube 105 in the front frame are centrally located on the center line of the frame in the front-rear direction, and the front reinforcing plate 401 and the rear reinforcing plate 402 are respectively hinged to the bottom of the reinforcing tube 105 in the front frame and the reinforcing tube 203 in the rear frame. The central setting forms a horizontally symmetrical structure, which is compact and has a good reinforcement effect.

[0043] In this embodiment, the front ends of both the left tube 101 and the right tube 102 of the front frame are bent downwards and extended to form a bent connecting section 101a suitable for connection with the vehicle body structure. By forming the bent connecting section 101a, a better connection with the vehicle body structure can be achieved. (See reference...) Figure 6 It is generally connected to the rear main beam of the frame body 6, which facilitates the horizontal arrangement of the main body of the frame after installation.

[0044] In this embodiment, a bending point reinforcing plate 101b for reinforcing the bending point is fixedly connected to the lower part of the bending connection section 101a. The bending point reinforcing plate 101b is conformally set with the bending connection section 101a. The bending point is the starting point of the cantilever structure and is subjected to a large torque. The bending point reinforcing plate 101b is set to enhance the structural strength at this point.

[0045] In this embodiment, the locking assembly 3 includes a locking plate 301 and a spring-loaded locking mechanism II 302. The rear end of the locking plate 301 is fixedly connected to the rear frame 2. The locking plate 301 is in the shape of a long strip. A protrusion is provided on the rear frame, and the locking plate 301 is fixed to the protrusion with screws. Two locking holes 301a are provided along the front-rear direction of the vehicle body. The spring-loaded locking mechanism II 302 is fixedly installed on the front frame 1. The spring-loaded locking mechanism II 302 includes a locking pin II 302a, which can be driven to insert into the corresponding locking hole 301a to lock the position of the rear frame 2. The positions of the two locking holes 301a correspond to the positions of the long frame and the short frame. Locking is achieved by the spring-loaded locking mechanism II 302. The structure is simple and the operation is convenient.

[0046] The spring-loaded locking mechanism II 302 here also includes the following structures: sleeve II 302d, cover II 302b, spring II, cable II 302c, and mounting bracket II. The mounting bracket II is fixedly connected to the front frame 1, the sleeve II 302d is fixedly connected to the mounting bracket II, the cover II 302b is threaded onto the sleeve II 302d, the spring II and locking pin II 302a are slidably fitted inside the sleeve II 302d, one end of the cable II 302c is fixedly connected to the locking pin II 302a, and the other end passes through the cover II 302b and is led out. In use, pulling the cable II 302c will raise the locking pin II 302a. Compared with the traditional spring-loaded locking structure, by setting the driving method of the cable II 302c, when arranging the motorcycle frame, the cable II 302c can generally be bent and extended to a position suitable for operation, which simplifies the operation and makes it easier to operate.

[0047] In this embodiment, the locking plate 301 and the spring latch mechanism II 302 are respectively installed at the central position on the upper part of the front frame 1 and the rear frame 2; this facilitates the formation of a symmetrical and compact transverse structure, and the installation on the upper part can also provide a certain degree of reinforcement.

[0048] In this embodiment, the locking plate 301 is provided with a guide groove II 301b between the two locking holes 301a. When the locking pin II 302a is pulled up, it is still confined within the guide groove II 301b, and the locking pin II 302a can be driven to slide relative to the guide groove II 301b. That is, when the locking pin II 302a is pulled up, the bottom of the locking pin II 302a is still located within the guide groove II 301b, so as to avoid excessive movement and slippage when it is stretched and slid.

[0049] The implementation principle of the above scheme is as follows:

[0050] Simultaneously pulling cable II and cable I releases the locking assembly 3 and reinforcing assembly 4. Then, pulling the rear frame 2, once in place, causes the corresponding locking pin to fall into position under the rebound force of the corresponding spring, completing the locking process; the operation is simple.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An adjustment mechanism for adjusting the length of a motorcycle frame, for mounting onto the motorcycle body structure to form a load-bearing position, characterized in that, include: A front frame and a rear frame, wherein the front frame is fixedly connected to the motorcycle frame, and the rear frame is slidably connected to the front frame in the longitudinal direction of the motorcycle body. The locking component, mounted on the frame component, is used to lock the rear frame after it has slid into place. The reinforcing component is installed on the frame component and forms a triangular reinforcing structure below the front and rear frames that can be linked together with the rear frame. The reinforcing assembly includes a front reinforcing plate and a rear reinforcing plate. The front reinforcing plate is hinged to the lower part of the front end of the front frame, and the rear reinforcing plate is hinged to the lower part of the rear end of the rear frame. The front and rear reinforcing plates are hinged to form a linked triangular reinforcing structure. The reinforcing assembly also includes a spring-loaded latch mechanism I installed on the side of the front reinforcing plate. The front reinforcing plate is provided with an upward and rearward opening U-shaped groove, and the rear reinforcing plate is slidably disposed within the U-shaped groove. The spring latch mechanism I includes a latch I, which transversely penetrates the front reinforcing plate and the rear reinforcing plate, forming a hinged connection between the front and rear reinforcing plates; The rear reinforcing plate is provided with a guide groove I. When the locking pin I is pulled up, it is still confined within the guide groove I, and the locking pin I can be driven to slide relative to the guide groove I.

2. The adjusting mechanism for adjusting the length of a motorcycle frame according to claim 1, characterized in that: The front frame includes a left front frame tube, a right front frame tube, a horizontal front frame tube I, and a horizontal front frame tube II. The left and right front frame tubes are arranged parallel to each other in the longitudinal direction relative to the vehicle body. The horizontal front frame tubes I and II are fixedly connected parallel to each other between the left and right front frame tubes to form a U-shaped front frame structure. The rear frame includes a U-shaped tube, and the two arms of the U-shaped tube are correspondingly slidably fitted inside the left and right front frame tubes.

3. The adjustment mechanism for adjusting the length of a motorcycle frame according to claim 2, characterized in that: The front frame also includes a front frame reinforcing tube that is parallel to the left tube and the right tube of the front frame. The front end of the front frame reinforcing tube is fixedly connected to the front frame horizontal tube I, and the rear end of the front frame reinforcing tube is fixedly connected to the front frame horizontal tube II. The rear frame also includes a rear frame horizontal tube and a rear frame inner reinforcing tube. The two ends of the rear frame horizontal tube are respectively fixedly connected to the two sides of the U-shaped tube. The rear end of the rear frame inner reinforcing tube is fixedly connected to the rear frame horizontal tube and extends forward to be fitted inside the front frame inner reinforcing tube.

4. The adjusting mechanism for adjusting the length of a motorcycle frame according to claim 2, characterized in that: The front ends of both the left and right front frame tubes are bent downwards and extended to form bent connection sections suitable for connection with the vehicle body structure.

5. The adjusting mechanism for adjusting the length of a motorcycle frame according to claim 4, characterized in that: A bending reinforcement rib for strengthening the bending point is fixedly connected to the lower part of the bending connection section.

6. The adjustment mechanism for adjusting the length of a motorcycle frame according to claim 1, characterized in that: The locking assembly includes a locking plate and a spring pin mechanism II. The rear end of the locking plate is fixedly connected to the rear frame and has two locking holes along the front-rear direction of the vehicle body. The spring-loaded locking mechanism II is fixedly installed on the front frame. The spring-loaded locking mechanism II includes a locking pin II, which can be driven to be inserted into the corresponding locking hole to lock the position of the rear frame.

7. The adjusting mechanism for adjusting the length of a motorcycle frame according to claim 6, characterized in that: The locking plate and spring latch mechanism II are respectively installed at the center of the upper part of the front frame and the rear frame.

8. The adjusting mechanism for adjusting the length of a motorcycle frame according to claim 6, characterized in that: The locking plate has a guide groove II between the two locking holes. When the locking pin II is pulled up, it is still confined within the guide groove II, and the locking pin II can be driven to slide relative to the guide groove II.

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