Frame structure with rear fork

Abstract

The utility model discloses a frame structure with a rear fork, and belongs to the technical field of frames. The technical problem that chains of a front chain wheel and a rear chain wheel on a vehicle are prone to falling off is solved. According to the technical scheme, the bicycle frame is characterized by comprising a bicycle frame body and a rear bottom fork, a shaft barrel part is arranged at the front end of the rear bottom fork, one outer end of the shaft barrel part is used for installing a front chain wheel, a rear shaft part is arranged at the rear end of the rear bottom fork and used for installing a rear chain wheel, and the front chain wheel and the rear chain wheel are in transmission through a chain; the supporting block is rotationally connected with the bottom of the frame body, the bottom of the frame body is further connected with the rear end of the rear bottom fork through a shock absorber, and the bicycle frame has the advantages that work is stable, at the moment, the chain cannot loosen due to position change of the front chain wheel or the rear chain wheel, and the chain is not prone to falling off from the front chain wheel or the rear chain wheel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of the frame, in particular to a frame structure with a rear fork. BACKGROUND

[0002] At present, the front chain wheel connected with the front pedal of the riding bicycle and the electric bicycle is installed at the middle shaft position of the frame, and the rear chain wheel on the rear wheel is connected through the chain, a rear fork is installed at the rear of the frame, the rear fork is connected with the rear wheel through a buffer assembly, so that the rear fork can be damped through the buffer assembly, and if it is electric, a driving motor for driving the rear wheel is installed on the rear wheel. The chain is connected between the front chain wheel and the rear chain wheel, and since the frame and the rear fork are not integrated, the shaft of the front chain wheel is located on the frame, and the shaft of the rear chain wheel is located on the rear fork. When the frame and the rear fork vibrate or swing, the positions of the front chain wheel and the rear chain wheel are offset, and the chain is loose and easily falls off the front chain wheel or the rear chain wheel.

[0003] Therefore, the frame structure is prone to the problem of chain falling off. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems and shortcomings: how to avoid the chain from falling off during transmission and improve the working stability, the present application provides a frame structure with a rear fork.

[0005] To achieve the above object and other related objects, the present application adopts the following technical scheme:

[0006] A frame structure with a rear fork, comprising a frame body and a rear fork, a shaft cylinder part is arranged at the front end of the rear fork, one outer end of the shaft cylinder part is used for installing a front chain wheel, a rear shaft part is arranged at the rear end of the rear fork, the rear shaft part is used for installing a rear chain wheel, the front chain wheel and the rear chain wheel are transmitted through a chain, a support block is arranged at the middle part of the rear fork, the support block is rotatably connected with the bottom of the frame body, and the bottom of the frame body is further connected with the rear end of the rear fork through a shock absorber.

[0007] Preferably, the frame body comprises two side frames and a cross beam, the two side frames are fixedly welded through the cross beam, the side frame comprises a V-shaped bottom frame, and the rear middle part of the bottom frame is rotatably connected with the support block.

[0008] Preferably, the front end of the rear fork is away from the bottom frame.

[0009] Preferably, the rear part of the rear fork has two fork legs, and each fork leg is connected with the tail part of the rear section of the bottom frame through a shock absorber.

[0010] Preferably, the frame body is provided with a rotating shaft seat, the rotating shaft seat is rotatably connected with a rotating shaft part, two ends of the rotating shaft part are respectively connected with one end of a shock absorber, and the other end of the shock absorber is rotatably connected with a fork leg.

[0011] Preferably, the included angle between the rear fork and the support block is 70 to 90 degrees.

[0012] In summary, the present application has at least one of the following beneficial technical effects:

[0013] 1. Since the front sprocket and the rear sprocket are both installed through the rear fork, that is, respectively installed at the front end and the rear end of the rear fork, even if the frame and the rear fork cannot be an integral structure, the chain will not be affected, since the positions of the front sprocket and the rear sprocket cannot be changed, the connection through the chain transmission is also very reliable.

[0014] 2. The rear fork and the frame are not an integral structure, so they are still connected through the shock absorber, making the structure more stable and more comfortable for riding. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the rear fork of the embodiment of the present application;

[0016] Figure 2 is a working example diagram of the embodiment;

[0017] Figure 3 is a working example perspective view.

[0018] Explanation of reference numerals of main components:

[0019] 1. frame body; 11. side frame; 12. cross beam; 13. bottom frame; 2. rear fork; 21. shaft cylinder part; 22. support block; 23. fork leg; 24. rear shaft part; 3. front sprocket; 4. rear sprocket; 5. chain; 6. shock absorber; 7. rotating shaft seat; 8. rotating shaft part. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. The present application can also be implemented or applied through different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0021] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concepts of the present application, and the diagrams only show the components related to the present application, but not the number, shape and size of the components in actual implementation, and the shape, number and ratio of the components in actual implementation can be changed at will, and the layout of the components can be more complex.

[0022] The specific embodiments of the present application are further described below with reference to the accompanying drawings.

[0023] Embodiment:

[0024] The embodiment of the present application discloses a frame structure with a rear flat fork 2, referring to Figure 1 , Figure 2 and Figure 3 , which comprises a frame body 1 and a rear flat fork 2, and the front end of the rear flat fork 2 is provided with a shaft cylinder part 21, one outer end of the shaft cylinder part 21 is used for installing a front sprocket 3. It should be noted that bearings and other components can be prevented on the shaft cylinder part 21, and pedals are also installed here, and the pedals are used to drive the front sprocket 3 to rotate, which belongs to the existing structure and will not be described in detail. Unlike the prior art, this structure is arranged at the front end of the rear flat fork 2, which is arranged on the frame in the past.

[0025] The rear end of the rear flat fork 2 is provided with a rear shaft part 24, which is used for installing a rear sprocket 4, and the front sprocket 3 and the rear sprocket 4 are driven by a chain 5. In the drawings, the specific sprocket and chain 5 are not shown, because the sprocket and chain 5, as well as the driving mode thereof, remain unchanged, so it is not difficult to understand that a simple schematic structure is shown in the drawings, and the working principle of the present application can be understood.

[0026] The middle part of the rear flat fork 2 is provided with a support block 22, and the support block 22 and the rear flat fork 2 are fixed by welding. The support block 22 is rotatably connected with the bottom of the frame body 1, and the bottom of the frame body 1 is also connected with the rear end of the rear flat fork 2 through a shock absorber 6. The rotatable connection mode herein can be realized by a pivot in the existing structure.

[0027] Referring to Figure 2 and Figure 3 , the frame body 1 comprises two side frames 11 and a cross beam 12, and the two side frames 11 are fixed by welding through the cross beam 12. The side frame 11 comprises a "V"-shaped bottom frame 13, and the rear middle part of the bottom frame 13 is rotatably connected with the support block 22. This frame structure is stable and firm.

[0028] In order to enable the rear fork 2 and the frame body 1 to have a moving space, the front end of the rear fork 2 is kept away from the bottom frame 13. In this way, when the front wheel and the rear wheel vibrate, the shock absorber 6 can be used for shock absorption, and the connection between the rear fork 2 and the frame is a soft connection with swinging, which does not hinder and interfere with the shock absorption process of the shock absorber 6.

[0029] Specifically, the rear part of the rear fork 2 has two fork legs 23, and each fork leg 23 is connected to the rear end of the bottom frame 13 through a shock absorber 6. The shock absorber 6 is a product with existing structure, and the assembly of both ends is a shaft connection mode, which is limited on the shaft on one hand, and can swing around the shaft on the other hand.

[0030] The frame body 1 is provided with a rotating shaft seat 7, and the rotating shaft part 8 is rotatably connected to the rotating shaft seat 7. The two ends of the rotating shaft part 8 are respectively connected to one end of the shock absorber 6, and the other end of the shock absorber 6 is rotatably connected to the fork leg 23.

[0031] In Figure 2 It can be seen from the figure that the included angle a between the rear fork 2 and the support block 22 is 70-90 degrees, and in a specific example, it is 77 degrees.

[0032] Working principle: Since the front sprocket 3 and the rear sprocket 4 are both installed through the rear fork 2, that is, they are respectively installed at the front end and the rear end of the rear fork 2. In this way, even if the frame and the rear fork 2 cannot be an integral structure, it will not affect the chain 5. Since the positions of the front sprocket 3 and the rear sprocket 4 cannot be changed, the connection through the chain 5 is also very reliable. At this time, the chain will not loosen due to the change of the position of the front sprocket 3 or the rear sprocket 4, and the chain is not easy to fall off from the front sprocket 3 or the rear sprocket 4. The rear fork 2 and the frame are not an integral structure, so they are still connected through the shock absorber 6, so that the riding is more comfortable and the structure is more stable.

[0033] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, any equivalent changes made to the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A frame structure with a rear swingarm (2), comprising a frame body (1) and a rear swingarm (2), characterized in that, The rear swingarm (2) has a sprocket (21) at its front end, and one outer end of the sprocket (21) is used to install the front sprocket (3). The rear axle (24) is provided at the rear end of the rear swingarm (2), and the rear axle (24) is used to install the rear sprocket (4). The front sprocket (3) and the rear sprocket (4) are driven by a chain (5). A support block (22) is provided in the middle of the rear swingarm (2), and the support block (22) is rotatably connected to the bottom of the frame body (1). The bottom of the frame body (1) is also connected to the rear end of the rear swingarm (2) through a shock absorber (6).

2. The frame structure with a rear horizontal fork (2) according to claim 1, characterized in that, The frame body (1) includes two side frames (11) and a crossbeam (12). The two side frames (11) are welded and fixed by the crossbeam (12). The side frame (11) includes a "V"-shaped bottom frame (13). The middle of the rear section of the bottom frame (13) is rotatably connected to the support block (22).

3. A frame structure with a rear horizontal fork (2) according to claim 2, characterized in that, The front end and bottom frame (13) of the rear horizontal fork (2) are spaced apart.

4. A frame structure with a rear horizontal fork (2) according to claim 2, characterized in that, The rear of the horizontal fork (2) has two fork feet (23), each fork foot (23) being connected to the rear end of the bottom frame (13) by a shock absorber (6).

5. A frame structure with a rear horizontal fork (2) according to claim 4, characterized in that, The frame body (1) is provided with a pivot seat (7), and a pivot part (8) is rotatably connected to the pivot seat (7). The two ends of the pivot part (8) are respectively connected to one end of the shock absorber (6), and the other end of the shock absorber (6) is rotatably connected to the fork foot (23).

6. A frame structure with a rear horizontal fork (2) according to claim 1, characterized in that, The included angle between the rear horizontal fork (2) and the support block (22) is 70 to 90 degrees.

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