Bottom fork and motorcycle with same

Abstract

The utility model belongs to the technical field of motorcycles, and provides a bottom fork and a motorcycle thereof, the bottom fork comprises two load-bearing beams and a bottom fork shaft arranged between the two load-bearing beams; the bearing assemblies are mounted on the transverse side and the longitudinal side of the bottom fork shaft respectively; the bearing assembly comprises two thrust bearings and two needle bearings arranged between the thrust bearings side by side. The left end and the right end of the bottom fork can bear radial force and axial force, a driving wheel supporting piece of a vehicle is stressed in a balanced mode, and the probability that the vehicle inclines when turning is greatly reduced.

Description

Technical Field

[0001] This application relates to the field of motorcycle technology, and in particular to a flat fork and a motorcycle thereof. Background Technology

[0002] A swingarm, also known as a stabilizer bar or anti-roll bar, primarily functions to reduce vehicle tilt during cornering, improving driving stability and ride comfort. It is typically connected between the left and right suspension systems of a vehicle. Through its special elastic design, it can transfer force to the other side when one side of the vehicle is under pressure, thereby balancing the vehicle's posture.

[0003] The radial forces on a swingarm fork primarily originate from the weight of the rear wheel, impact forces during riding, centrifugal forces during cornering, engine vibrations, and braking forces. To cope with these complex stresses, existing motorcycle swingarm forks typically employ reinforced designs to improve their strength and rigidity, such as increasing wall thickness, adding reinforcing ribs, or incorporating needle roller bearings. The axial forces on the swingarm fork mainly come from the weight of the rear wheel, dynamic loads during riding, forces during acceleration and braking, and lateral forces during cornering. To ensure the swingarm can effectively withstand these forces, motorcycle designs usually consider its strength and rigidity, for example, by adding thrust bearings.

[0004] To improve vehicle structural stability and ensure driving safety, researchers are constantly improving the swingarm structure. For example, patent CN204124265U discloses a swingarm and its motorcycle, in which the bearing assembly includes a double-acting thrust bearing and a needle roller bearing, located at opposite ends of the axle tube. In this swingarm, the needle roller bearing increases the radial load on the left end of the axle tube, while the double-acting thrust bearing increases the axial load on the right end. However, when the motorcycle is turning, this swingarm cannot ensure a balance between the radial and axial loads at both ends. When the motorcycle passes through a curve at high speed, the forces are easily uneven, leading to issues such as veering, reduced stability and loss of control, accelerated wear of the swingarm, and sudden breakage. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model provides a flat fork and its motorcycle, which can ensure that both the left and right ends of the flat fork can withstand radial and axial forces, so that the drive wheel support of the vehicle is subjected to balanced forces and the probability of the vehicle tilting when turning is greatly reduced.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of this utility model provides a flat fork, including two load-bearing beams and a flat fork shaft installed between the two load-bearing beams; it also includes bearing assemblies installed on the transverse and longitudinal sides of the flat fork shaft respectively; the bearing assemblies include two thrust bearings and two needle roller bearings arranged side by side between the thrust bearings.

[0008] Based on the above-mentioned technical means, needle roller bearings and thrust bearings are installed in both the transverse and longitudinal directions of the swingarm shaft of this application, which can ensure that both the left and right ends of the swingarm shaft can withstand radial and axial forces. This structure can make the drive wheel support of the motorcycle bear forces evenly, and maintain a consistent support and handling feel when the motorcycle is leaning to the left or right. As a result, the motorcycle is more stable when turning and less likely to deviate from its course.

[0009] In this application, needle roller bearings and thrust bearings are used to share different types of loads. This application uses needle roller bearings to bear radial loads and thrust bearings to bear axial loads. By installing needle roller bearings between two thrust bearings, the radial and axial loads can be effectively distributed, thereby reducing the burden on a single bearing. Moreover, this installation method can improve the rotational accuracy of the entire bearing assembly, reduce the frictional resistance of the bearing assembly, improve operating efficiency, and improve the stability and reliability of the bearing assembly, making it more suitable for high-speed and heavy-load working conditions.

[0010] Furthermore, the bearing assemblies on both sides of the horizontal fork beam are located in the same longitudinal plane.

[0011] According to the above technical means, the bearing assemblies on the left and right sides of this application are located in the same longitudinal plane, which can ensure the uniform distribution of axial force, reduce the structural deformation and damage of the flat fork shaft caused by uneven force distribution, and help maintain the overall stability and rigidity of the flat fork; and when the bearing assemblies are located in the same longitudinal plane, they can more effectively share the axial force, thereby improving the overall load-bearing capacity and being able to withstand larger axial loads.

[0012] Furthermore, it also includes an inner bushing for restricting the movement space of the bearing assembly, which is mounted on the swingarm shaft via the inner bushing.

[0013] Furthermore, it also includes a locking element mounted on the fork shaft for positioning the inner bushing.

[0014] Furthermore, it also includes an outer bushing that is interference-fitted with the needle roller bearing.

[0015] Furthermore, it also includes dust covers installed at the two lateral ends of the horizontal fork shaft.

[0016] Furthermore, the locking mechanism is installed inside the dust cover.

[0017] Furthermore, the thrust bearing is a double-direction thrust bearing.

[0018] The second aspect of this utility model provides a motorcycle, including the aforementioned flat fork.

[0019] The beneficial technical effects of this utility model are as follows:

[0020] The horizontal fork of this utility model is equipped with thrust bearings and needle roller bearings on both the horizontal and vertical sides of the horizontal fork shaft, which can ensure that both the left and right ends of the horizontal fork can withstand radial and axial forces, so that the drive wheel support of the vehicle is subjected to balanced forces and the probability of the vehicle tilting when turning is greatly reduced.

[0021] The motorcycle of this invention is equipped with the aforementioned flat fork. When it is bending to the left or right, the motorcycle is more stable because the force is evenly distributed on the flat fork. Attached Figure Description

[0022] The accompanying drawings, incorporated in and forming part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without inventive effort. In the drawings:

[0023] Figure 1 This is a schematic diagram of a flat fork structure shown in one embodiment of this application;

[0024] Figure 2 This is a partial cross-sectional view of the flat fork structure shown in an embodiment of this application;

[0025] Figure 3 for Figure 2 Enlarged view of section A;

[0026] Figure 4 This is a schematic diagram of a partial motorcycle frame according to an embodiment of this application.

[0027] Figure Labels

[0028] 1: Load-bearing beam; 2: Flat fork axle; 3: Main frame; 4: Subframe; 5: Liner; 21: Dust cover; 22: Inner bushing; 23: Outer bushing; 24: Needle roller bearing; 25: Thrust bearing; 26: Locking element. Detailed Implementation

[0029] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should be understood that certain features of this invention (described in the context of separate embodiments for clarity) may also be provided in combination in a single embodiment. Conversely, multiple features of this invention (described in the context of a single embodiment for brevity) may also be provided separately or in any suitable combination or, where appropriate, in any other described embodiment of this invention. Certain features described in the context of various embodiments will not be considered essential features of those embodiments unless the embodiment is inoperable without those elements. The present invention is further illustrated below by specific examples; however, it should be noted that the specific process conditions and results described in the embodiments of this invention are for illustrative purposes only and should not be construed as limiting the scope of protection of this invention. All equivalent changes or modifications made in accordance with the spirit and essence of this invention should be covered within the scope of protection of this invention.

[0030] like Figures 1 to 3 As shown, this utility model provides a flat fork, including two load-bearing beams 1 and a flat fork shaft 2 installed between the two load-bearing beams 1; it also includes bearing assemblies installed on the transverse and longitudinal sides of the flat fork shaft 2 respectively; the bearing assemblies include two thrust bearings 25 and two needle roller bearings 24 arranged side by side between the thrust bearings 25.

[0031] According to the above technical means, needle roller bearings 24 and thrust bearings 25 are installed on both the horizontal and vertical sides of the flat fork shaft 2 of this application, which can ensure that both the left and right ends of the flat fork shaft 2 can withstand radial and axial forces. This structure can make the drive wheel support of the motorcycle bear forces evenly, and maintain a consistent support and handling feel when the motorcycle is riding left and right. As a result, the motorcycle is more stable when turning and less likely to deviate.

[0032] In this application, needle roller bearing 24 and thrust bearing 25 are used to share different types of loads. This application uses needle roller bearing 24 to bear radial loads and thrust bearing 25 to bear axial loads. By installing needle roller bearing 24 between two thrust bearings 25, the radial and axial loads can be effectively distributed, thereby reducing the burden on a single bearing and extending the service life of the bearing assembly.

[0033] Secondly, because the needle roller bearing 24 has a small radial cross-sectional dimension and a large load-bearing capacity, it can provide high-precision rotational support in a limited space. When the needle roller bearing 24 is installed between two thrust bearings 25, the rotational accuracy of the entire bearing assembly can be improved.

[0034] In addition, the needle roller bearing 24 has low frictional resistance, low power consumption, and high mechanical efficiency, which helps to reduce energy loss in the bearing assembly. Installing the needle roller bearing 24 between the two thrust bearings 25 can reduce the frictional resistance of the bearing assembly and improve operating efficiency, as well as improve the stability and reliability of the bearing assembly, making it more suitable for high-speed and heavy-load conditions.

[0035] In this application, the needle roller bearing 24 can be selected from different types according to actual performance requirements, such as self-aligning needle roller bearings.

[0036] In this application, two needle roller bearings 24 are arranged side by side to improve the overall load-bearing capacity and stability of the bearing assembly. In practical applications, the load of the flat fork can be more evenly distributed between the two needle roller bearings 24, thereby reducing the load concentration of a single needle roller bearing 24 and improving vibration resistance.

[0037] In one embodiment of this application, the bearing assemblies on both sides of the crossbeam of the flat fork shaft 2 are located on the same longitudinal plane. This installation method can ensure that the axial force is evenly distributed, reduce the structural deformation and damage of the flat fork shaft 2 caused by uneven force distribution, and help maintain the overall stability and rigidity of the flat fork. Furthermore, when the bearing assemblies are located on the same longitudinal plane, they can more effectively share the axial force, thereby improving the overall load-bearing capacity and enabling them to withstand larger axial loads.

[0038] In this application, the thrust bearing 25 is a double-direction thrust bearing, which can withstand alternating axial loads in two directions and can limit the axial movement of the flat fork shaft 2 in two directions.

[0039] In one embodiment of this application, the swingarm further includes an inner bushing 22 for limiting the movement space of the bearing assembly, the bearing assembly being mounted on the swingarm shaft 2 via the inner bushing 22. This application utilizes the inner bushing 22 to reduce direct contact between the swingarm shaft 2 and the bearing assembly, thereby reducing wear and extending the service life of the bearing assembly; the inner bushing 22 prevents unnecessary axial movement of the swingarm shaft 2, thereby ensuring stable operation of the swingarm shaft 2; and the inner bushing 22 limits the movement space of the bearing assembly, preventing the bearing assembly from being locked onto the swingarm shaft 2 and unable to rotate.

[0040] In one embodiment of this application, the swingarm further includes a locking member 26 mounted on the swingarm shaft 2 and used for positioning the inner bushing 22. The locking member 26 of this application includes, but is not limited to, a locking nut.

[0041] In one embodiment of this application, the flat fork further includes an outer bushing 23 that is interference-fitted with the needle roller bearing 24. This application utilizes the interference fit to prevent the bearing assembly from loosening or falling off during high-speed rotation and to ensure the geometric accuracy between the needle roller bearing 24 and the outer bushing 23, thereby improving the accuracy of the bearing assembly.

[0042] In one embodiment of this application, the swingarm further includes dust covers 21 installed at the two lateral ends of the swingarm shaft 2, and a locking member 26 is installed inside the dust covers 21. This application utilizes the dust covers 21 to prevent dust, mud, and other impurities from entering the shock absorber, helping to buffer vibrations during motorcycle riding and improving the stability and comfort of the motorcycle. The dust covers 21 in this application include, but are not limited to, rubber dust covers 21.

[0043] This utility model also provides a motorcycle, including the aforementioned flat fork.

[0044] like Figure 4 As shown, the motorcycle frame of this application has an overall "U"-shaped fully enclosed structure. The advantages of this structure are good overall frame rigidity and good consistency of the various mounting points.

[0045] In one embodiment of this application, an engine connecting plate is provided on the main frame 3, which helps to increase the mounting point at the front end of the engine, suppress engine vibration, and thus improve the riding comfort of the whole vehicle.

[0046] In one embodiment of this application, the main frame 3 is equipped with a lower side beam, which is beneficial for the layout and routing of the vehicle's pipelines, as well as the layout and connection of the parking brackets.

[0047] In one embodiment of this application, the upper beams of the main frame 3 are all integral aluminum alloy structures. The advantage of this structure is that through two positioning connection holes at the front and rear, the front end is connected to the front body of the frame, and the rear end is connected to the left and right main frames 3, which can ensure the consistency of the relative positions of the entire vehicle frame and ensure that the overall vehicle size meets the design parameters.

[0048] In one embodiment of this application, the fuel tank support of the main frame 3 is bolted and separable, which is beneficial for the iterative upgrade and expansion of the frame.

[0049] In one embodiment of this application, the main frame 3-slot is a rigid combination that is not adjustable. This structure has good consistency after assembly, and the overall rigidity and structural strength of the frame are good. In addition, the engine can be disassembled and assembled independently, and the maintainability of other accessories of the vehicle is good.

[0050] In one embodiment of this application, the subframe 4 is a modular assembly. This modular structure is beneficial for the arrangement and wiring of electronic fuel injection and electrical components such as the ECU; the modular structure is also beneficial for vehicle iterative upgrades and expansions, and facilitates maintenance.

[0051] In one embodiment of this application, the liner 5 is fixed, and the distance between the main frames 3 is not adjustable.

[0052] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A fork, comprising two load-bearing beams (1), and a fork shaft (2) mounted between the two load-bearing beams (1), characterized in that, It also includes bearing assemblies mounted on the transverse and longitudinal sides of the flat fork shaft (2); the bearing assemblies include two thrust bearings (25) and two needle roller bearings (24) arranged side by side between the thrust bearings (25).

2. The flat fork according to claim 1, characterized in that, The bearing assemblies on both sides of the crossbeam of the flat fork shaft (2) are located in the same longitudinal plane.

3. The flat fork according to claim 1 or 2, characterized in that, It also includes an inner bushing (22) for limiting the movement space of the bearing assembly, which is mounted on the flat fork shaft (2) via the inner bushing (22).

4. The flat fork according to claim 3, characterized in that, It also includes a locking element (26) mounted on the fork shaft (2) and used for positioning the inner bushing (22).

5. The flat fork according to claim 1, 2, or 4, characterized in that, It also includes an outer bushing (23) that is interference-fitted with the needle roller bearing (24).

6. The flat fork according to claim 1, 2, or 4, characterized in that, It also includes dust covers (21) installed at the two transverse ends of the flat fork shaft (2).

7. The flat fork according to claim 6, characterized in that, The locking element (26) is installed inside the dust cover (21).

8. The flat fork according to claim 1, 2, 4 or 7, characterized in that, The thrust bearing (25) is a double-acting thrust bearing (25).

9. A motorcycle, characterized in that, Includes the flat fork as described in any one of claims 1 to 8.

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