Rear suspension structure and rear suspension system of motorcycle

Abstract

The utility model relates to the technical field of motorcycles, in particular to a rear suspension structure of a motorcycle, which comprises a cradle and a connecting rod, the cradle is rotatably connected with the connecting rod, the other end of the connecting rod is used for being rotatably connected with a motorcycle frame, and a connecting part and a fork part which are integrally formed are arranged on the cradle. Two forks of the fork part are provided with connecting holes used for connecting the shock absorber between the two forks, the cradle is of an upwards-arched V-shaped structure, and a bottom connecting base of the shock absorber is connected to the connecting hole in the arched position of the cradle. The rear suspension system of the motorcycle comprises the rear suspension structure of the motorcycle. The scheme is used for solving the problems that the strength of a bottom connecting structure of a shock absorber is low or the connection of a cradle is complicated and the strength is low.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycles, and particularly relates to a rear suspension structure and a rear suspension system of a motorcycle. Background Art

[0002] Existing motorcycles have a front shock absorption structure and a rear suspension structure for installing a rear shock absorber. The front shock absorber is used to absorb shock for the front wheel, and the rear shock absorber is used to absorb shock for the rear wheel and the frame.

[0003] In the design of the existing rear suspension structure, the rear suspension structure includes a rocker and a connecting rod. There are three rotating connection holes on the rocker. The connection lines of the three rotating connection holes form a triangle. One of the connection holes is rotatably connected to the connecting rod, another connection hole is rotatably connected to an ear provided on the swing arm, and the remaining connection hole is rotatably connected to the rear shock absorber. The other end of the connecting rod is rotatably connected to the frame. For example, in the motorcycle rear shock absorber installation and connection device with the patent publication number CN200988554Y, the substrate in this shock absorber connection device, that is, the rocker mentioned in this article, has an upward-arching V-shaped structure, so that the shock absorber installed in the middle can have a faster feedback speed during shock absorption, thereby improving the shock absorption effect.

[0004] However, in the current such structure, due to the fast feedback speed of the shock absorber, higher force requirements are imposed on the shock absorber. However, at the position where the shock absorber is currently connected to the rocker, either one end of the shock absorber is connected to two insertion rods. For example, in a compact rear suspension structure applied to a two-wheeled vehicle and the two-wheeled vehicle in Figure 2 the insertion rod form in the bottom structure of the shock absorber in it, the mounting holes processed on the two insertion rods are aligned with the mounting holes on the rocker, and the two insertion rods clamp the rocker from the left and right sides of the rocker. In this way, during shock absorption, the end of the shock absorber is subjected to large force, which easily causes the two insertion rods to deform; in the prior art, there is also a way of making the rocker into two parts to clamp the shock absorber. For example, in a motorcycle four-link rear shock absorber mechanism with the patent publication number CN210212636U, the middle lever in this technology is the rocker commonly known in the industry, and this rocker is split into left and right parts, but this structure has problems of more assembly parts and lower strength of the rocker. Summary of the Utility Model

[0005] The utility model aims to provide a rear suspension structure and a rear suspension system of a motorcycle to solve the problems that either the bottom connection structure of the shock absorber has low strength or the rocker connection is complex and has low strength pointed out above.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A rear suspension structure of a motorcycle, comprising a rocker and a connecting rod. The rocker is rotatably connected to the connecting rod, and the other end of the connecting rod is used to be rotatably connected to the motorcycle frame. The rocker is provided with an integrally formed connecting portion and fork portion. Connecting holes for connecting a shock absorber between the two forks are provided on the two forks of the fork portion.

[0008] The principle and advantages of this solution are as follows: By designing the rocker as an integrally formed connecting portion and fork portion, the rocker can sandwich the shock absorber between the two forks of the fork portion, ensuring that the bottom connection structure of the shock absorber can be a seat structure rather than a plug rod structure, thereby ensuring the strength of the bottom connection structure at the connection between the shock absorber and the rocker. At the same time, by designing the rocker as an integrally formed connecting portion and fork portion, it is ensured that the rocker does not need to be designed as a two-piece type, thus ensuring that the overall strength of the rocker meets the requirements and avoiding the problem of an increase in the number of rear suspension structure parts caused by the two-piece type of the rocker.

[0009] Preferably, as an improvement, the rocker has an upwardly arched V-shaped structure, and the bottom connection seat of the shock absorber is connected to the connection hole at the arched position of the rocker to improve the shock feedback effect and shock performance.

[0010] Preferably, as an improvement, there are two connecting holes on the fork portion. One connecting hole is used to install the bottom connection seat of the shock absorber, and the other connecting hole is used to connect the connecting rod. This solution makes the connecting rod also have an integral structure, which helps to ensure the strength of the connecting rod.

[0011] Preferably, as an improvement, steps are provided on the inner side surface of the fork portion for installing the shock absorber and the connecting rod. The steps are arranged such that the distance between the two forks of the fork portion at the free end is greater than the distance at the middle, thereby facilitating the installation of the shock absorber and the connecting rod.

[0012] Preferably, as an improvement, the axial length of the connecting portion is not equal to the axial length of the fork portion, so as to form a height difference on the outer side surface between the fork portion and the connecting portion, thereby facilitating the machining of the end surface of the connecting portion.

[0013] The present utility model also provides a rear suspension system of a motorcycle, comprising the rear suspension structure of the motorcycle described above.

[0014] Preferably, as an improvement, it further comprises a flat fork, and the flat fork is rotatably connected to the connecting portion of the rocker.

[0015] Preferably, as an improvement, a connecting shaft penetrating the flat fork is inserted into one end of the flat fork adjacent to the motorcycle head. The connecting shaft is fixedly connected to the frame, the flat fork is rotatably connected to the connecting shaft, and a transmission shaft is rotatably connected to the connecting shaft.

[0016] Preferably, as an improvement, a large transmission wheel is fixed to one end of the transmission shaft and a small transmission wheel is fixed to the other end. By installing transmission wheels of different sizes on the transmission shaft, it is convenient to decelerate the motorcycle. Since a large transmission wheel and a small transmission wheel are provided on the same transmission shaft, on the basis that the large transmission wheel is used to decelerate the output of the motorcycle motor and then the small transmission wheel is used to drive the rear wheel of the motorcycle to rotate, it helps to achieve two-stage deceleration on the motorcycle; in addition, there are transmission wheels at both ends of the transmission shaft, which also helps to balance the weights on the left and right sides of the motorcycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a three-dimensional structural diagram (with shock absorber) of the rear suspension structure connected to the cross tube of the flat fork and the connecting tube on the frame in the embodiment of the present invention.

[0018] Figure 2 is Figure 1 front view (with shock absorber).

[0019] Figure 3 FIG. is a three-dimensional structural diagram of the heavy rocker of the rear suspension structure in the embodiment of the present invention.

[0020] Figure 4 FIG. is a three-dimensional structural diagram when the rear suspension system in the embodiment of the present invention is connected to the connecting tube on the frame.

[0021] Figure 5 is Figure 4 three-dimensional structural diagram after rotating by an angle.

[0022] Figure 6 is Figure 4 front view.

[0023] Figure 7 is Figure 4 top view.

[0024] Figure 8 is Figure 6 A-A cross-sectional view in (the part of the frame is introduced in the figure to show the connection relationship at the connecting shaft and the transmission shaft).

[0025] Figure 9 is Figure 4 three-dimensional structural diagram after adding an output wheel, a sprocket and a frame in. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following is further detailed through specific embodiments:

[0027] The reference numerals in the drawings of the specification include: rocker 1, connecting portion 11, fork portion 12, step 121, connecting rod 2, bottom connecting seat 3, flat fork 4, cross tube 41, lug 411, connecting shaft 5, transmission shaft 6, large transmission wheel 7, small transmission wheel 8, output wheel 91, sprocket 92, and vehicle frame 10.

[0028] The embodiment is basically as shown in the attached Figures 1 to 9 figures.

[0029] A rear suspension structure of a motorcycle includes a rocker 1 and a connecting rod 2. The rocker 1 is rotatably connected to the connecting rod 2, and the other end of the connecting rod 2 is used for rotatably connecting to a lug fixed on the motorcycle vehicle frame 10. The rocker 1 has an upwardly arched V-shaped structure during use.

[0030] The rocker 1 includes an integrally formed connecting portion 11 and fork portion 12. There are three connecting holes machined on the rocker 1, and the connection lines of the three connecting holes form a triangle. One of the connecting holes is located on the connecting portion 11, and the remaining two connecting holes are both located on the fork portion 12. One of the connecting holes is located at the arched position of the rocker 1, and this connecting hole at the arched position is used for connecting to the bottom connecting seat 3 of the shock absorber. Another connecting hole near the free end of the fork portion 12 is used for connecting to the connecting rod 2. Both the connecting rod 2 and the bottom connecting seat 3 are provided with mounting holes. By inserting a shaft into the mounting holes and the corresponding connecting holes, the rocker 1 is rotatably connected to the connecting rod 2, and the rocker 1 is rotatably connected to the bottom connecting seat 3 of the shock absorber.

[0031] On the inner side of the fork portion 12 where the shock absorber and the connecting rod 2 are installed, a step 121 is formed. The step 121 is arranged such that the distance between the two forks of the fork portion 12 at the free end is greater than the distance at the middle, so that there is more space during the process of inserting the shock absorber into the fork portion 12, facilitating the installation of the bottom connecting seat 3 of the shock absorber.

[0032] The axial length of the connecting portion 11 is not equal to the axial length of the fork portion 12. Specifically, the axial length of the connecting portion 11 is less than the axial length of the fork portion 12 to facilitate the machining of the end face of the connecting portion 11.

[0033] This embodiment also provides a rear suspension system of a motorcycle, which includes the rear suspension structure of the motorcycle described above, and further includes a flat fork 4. A cross tube 41 is fixed on the flat fork 4, and a lug 411 is provided on the cross tube 41. The lug 411 of the flat fork 4 is rotatably connected to the connecting portion 11 of the rocker 1.

[0034] A connecting shaft 5 penetrating the flat fork 4 is inserted into the left circular hole of the flat fork 4 adjacent to the motorcycle head. The connecting shaft 5 is fixedly connected to the vehicle frame 10. The flat fork 4 is rotatably connected to the connecting shaft 5 through a bearing. The connecting shaft 5 is rotatably connected to a transmission shaft 6 through a bearing. The transmission shaft 6 is sleeved on the connecting shaft 5 and is located between the two forks of the flat fork 4.

[0035] One end of the transmission shaft 6 is fixedly provided with a large transmission wheel 7, and the other end is fixedly provided with a small transmission wheel 8. In this embodiment, the large transmission wheel 7 is connected to the small output wheel 91 on the motor output shaft of the motorcycle through belt transmission to achieve the first-stage deceleration of the motorcycle transmission system. The small transmission wheel 8 is a sprocket 92, and the small transmission wheel 8 drives the rear wheel of the motorcycle to rotate through a chain transmission method. The large sprocket 92 is coaxially fixed on the rear wheel of the motorcycle, and the transmission between the small transmission wheel 8 and the large sprocket 92 realizes another deceleration of the motorcycle transmission system.

[0036] In this embodiment, by designing the rocker 1 into an integrally formed connecting portion 11 and fork portion 12, the rocker 1 can clamp the bottom connecting seat 3 of the shock absorber between the two forks of the fork portion 12, so as to ensure that the bottom connecting structure of the used shock absorber can be a seat body structure rather than a plug rod structure, thereby ensuring the strength of the bottom connecting seat 3 at the connection between the shock absorber and the rocker 1. At the same time, by designing the rocker 1 into an integrally formed connecting portion 11 and fork portion 12, it is ensured that the rocker 1 does not need to be designed as a two-piece type, and then it is ensured that the overall strength of the rocker 1 meets the requirements, and the problem of increasing the number of rear suspension structure parts caused by the two-piece type of the rocker 1 is avoided.

[0037] In addition, in this embodiment, a connecting shaft 5 is inserted into the round hole of the flat fork 4, so that the transmission shaft 6 can rotate between the flat forks 4, realizing another stage of deceleration of the motorcycle by using the space between the flat forks 4, improving the utilization rate of the space between the flat forks 4, and with the large transmission wheel 7 and the small transmission wheel 8 arranged at both ends of the transmission shaft 6, it helps to balance the weights on the left and right sides of the motorcycle.

[0038] The above are only the embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. A rear suspension structure of a motorcycle, comprising a cradle and a connecting rod, wherein the cradle is rotatably connected to the connecting rod, and the other end of the connecting rod is rotatably connected to the motorcycle frame, characterized in that: The cradle is provided with a connecting portion and a fork portion which are integrally formed, and two forks of the fork portion are provided with connecting holes for connecting the shock absorber between the two forks.

2. A rear suspension structure for a motorcycle according to claim 1, characterized in that: The cradle is in an upwardly arched V-shaped structure, and the bottom connecting seat of the shock absorber is connected to the connecting hole at the arched position of the cradle.

3. The rear suspension structure of a motorcycle according to claim 1, characterized in that: The fork portion is provided with two connection holes, one connection hole is used for installing the bottom connection seat of the shock absorber, and the other connection hole is used for connecting the connecting rod.

4. A rear suspension structure for a motorcycle according to claim 3, characterized in that: The inner side surface of the fork portion where the shock absorber and the connecting rod are mounted is provided with a step.

5. The rear suspension structure of a motorcycle according to claim 1, characterized in that: The axial length of the connecting portion is not equal to the axial length of the fork portion.

6. A rear suspension system for a motorcycle, characterized in that: A rear suspension structure for a motorcycle comprising any one of claims 1-5.

7. A rear suspension system for a motorcycle according to claim 6, characterized in that: It also includes a flat fork, which is rotatably connected to the connecting part of the cradle.

8. A rear suspension system for a motorcycle according to claim 7, characterized in that: A connecting shaft penetrating through the flat fork is inserted into one end of the flat fork abutting against the front of the motorcycle. The connecting shaft is fixedly connected to the frame, the flat fork is rotatably connected to the connecting shaft, and a transmission shaft is rotatably connected to the connecting shaft.

9. A rear suspension system for a motorcycle according to claim 8, characterized in that: A large transmission wheel is fixed on one end of the transmission shaft, and a small transmission wheel is fixed on the other end.

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