Motorcycle cantilever structure and motorcycle frame

Abstract

This utility model discloses a motorcycle cantilever structure and a motorcycle frame. The lateral cantilever, which is visible in the overall vehicle configuration, is made of metal to avoid affecting the aesthetics of the motorcycle's appearance. The front and rear connectors, which connect the lateral cantilever to the frame but are not visible, are made of reinforced plastic. Due to the influence of elastic modulus and density, the natural frequencies of reinforced plastic and metal materials differ significantly. This not only effectively reduces the possibility of resonance between the front and rear connectors and the lateral cantilever and motorcycle frame at the motorcycle's operating frequency, thus optimizing the overall vehicle mode, but also, thanks to the lightweight and high-strength characteristics of reinforced plastic, it helps to reduce the overall vehicle weight while ensuring the load-bearing strength of the lateral cantilever. This effectively solves the problem that existing cantilever structures cannot simultaneously meet the requirements of appearance and overall mode, achieving the effect of ensuring the motorcycle's appearance and improving its overall mode.

Description

Technical Field

[0001] This utility model belongs to the technical field of motorcycle decoration and protection during operation, specifically relating to a motorcycle cantilever structure and a motorcycle frame. Background Technology

[0002] The fuel tank of a motorcycle is usually located at the front of the frame, and the engine is located below the fuel tank. To improve the aesthetics of the motorcycle's appearance and protect the fuel tank or engine, some motorcycles have lateral cantilever arms on both sides of the engine near the fuel tank. For example, in Chinese patent CN104108443A, the steel protective frame of the motorcycle's fully enclosed guard and the whole vehicle rollover protection structure is the aforementioned lateral cantilever arm, which includes two lateral tubes and an oblique reinforcing tube connecting the two lateral tubes. The two ends of the lateral tubes are provided with mounting sleeves and are connected to the main structure of the frame through connectors.

[0003] Currently, the connectors used to link the lateral cantilever and the frame are mostly metal forming parts or metal profiles. While these metal forming parts or profiles can meet the strength requirements for mounting the lateral cantilever, the fact that both the connector and the lateral cantilever are made of metal makes them prone to structural resonance, which in turn affects the overall modal characteristics of the motorcycle frame. See Chinese patent CN204173080U for a motorcycle fuel tank cover. This patent uses ABS tubing to form the lateral cantilever. Although the natural frequencies of the ABS lateral cantilever and the metal connector differ significantly, effectively reducing the possibility of structural resonance, the ABS lateral cantilever not only fails to provide the aesthetic appeal of metal, potentially affecting the motorcycle's design, but also has relatively weak strength, which can negatively impact the user experience. Therefore, a motorcycle cantilever structure that can guarantee both aesthetics and prevent resonance from affecting the overall modal characteristics is needed. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a motorcycle cantilever structure and motorcycle frame, which solves the technical problem that the existing cantilever structure is unable to simultaneously meet the requirements of appearance and overall modality, and achieves the effect of ensuring the appearance of the motorcycle and improving the overall modality.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A motorcycle cantilever structure includes two symmetrically distributed lateral cantilever arms. A front connector is connected between the front ends of the two lateral cantilever arms, and a rear connector is connected between the rear ends. The front connector and the rear connector are respectively provided with a front mounting position and a rear mounting position for connecting to the frame. The lateral cantilever arms are made of metal, and the front connector and the rear connector are both made of reinforced plastic.

[0007] Furthermore, the reinforced plastic is PA6 / 20%GF.

[0008] Furthermore, the front connector has an arc-shaped structure and includes a front handle, a front arm, and a front tip. The front mounting position is located on the front handle, the front arm bends backward, and the front tip is connected to the lateral cantilever. The rear connector has an arc-shaped structure and includes a rear handle, a rear arm, and a rear tip. The rear mounting position is located on the rear handle, the rear arm bends upward, and the rear tip is connected to the lateral cantilever.

[0009] Furthermore, the cross-section of the front bow arm is U-shaped with the opening facing downwards.

[0010] Furthermore, both the front and rear sides of the front bow arm have protruding ribs that extend as the front bow arm bends.

[0011] Furthermore, the cross-section of the rear boom is I-shaped and includes a flange and a web. The two flanges are distributed vertically, and the web connects the two flanges.

[0012] Furthermore, several reinforcing ribs are connected between the two flanges on the front and rear sides of the web, and the reinforcing ribs are distributed at intervals along the direction of the bending extension of the rear bow arm.

[0013] Furthermore, the front handlebar has a through-hole forming a front mounting position, and the rear handlebar has a through-hole forming a rear mounting position, so that the front and rear connectors can be connected to the frame by bolts.

[0014] Furthermore, the front end of the transverse cantilever is provided with a connecting plate, which has a front connecting hole extending in the left-right direction. The rear end of the transverse cantilever is provided with a connecting sleeve, which has a rear connecting hole extending in the left-right direction. The front bow tip forms a front connecting head, and the rear bow tip forms a rear connecting head. The front and rear connecting heads are respectively provided with receiving grooves, and nuts are embedded in the receiving grooves. The nut on the front connecting head is coaxial with the front connecting hole. The connecting plate is connected to the front connecting head by a bolt passing through the front connecting hole and threaded to the corresponding nut. The nut on the rear connecting head is coaxial with the rear connecting hole. The connecting sleeve is connected to the front connecting head by a bolt passing through the rear connecting hole and threaded to the corresponding nut.

[0015] This utility model also includes a motorcycle frame, which includes a front main beam, a rear diagonal beam, and a motorcycle cantilever structure as described above. The front connector is connected to the front main beam through a front mounting position, and the rear connector is connected to the rear diagonal beam through a rear mounting position.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The motorcycle cantilever structure described in this utility model is designed with the lateral cantilever, which is visible in the overall vehicle configuration, made of metal to avoid affecting the aesthetics of the motorcycle's appearance. The front and rear connecting parts, which are not visible in the overall configuration and connect the lateral cantilever to the frame, are made of reinforced plastic. Due to the influence of elastic modulus and density, the natural frequencies of reinforced plastic and metal materials are significantly different. This not only effectively reduces the possibility of the front and rear connecting parts resonating with the lateral cantilever and motorcycle frame at the motorcycle's operating frequency, thereby optimizing the overall vehicle mode, but also benefits from the lightweight and high-strength characteristics of reinforced plastic, which helps to reduce the overall weight of the vehicle while ensuring the load-bearing strength of the lateral cantilever.

[0018] 2. The motorcycle cantilever structure of this utility model has both the front and rear connecting parts designed as bow-shaped structures. This facilitates the elastic deformation of the front and rear connecting parts, which are made of reinforced plastic, when subjected to impact, thereby achieving a buffering and shock-absorbing effect. In addition, the bow arms of the front and rear connecting parts bend backward and upward, respectively, so that the front and rear connecting parts are mainly used to absorb the impact forces in the front-rear direction and vertical direction, respectively, which helps to improve the reliability of the motorcycle cantilever structure. Attached Figure Description

[0019] Figure 1 This is a front view of the motorcycle frame described in the embodiment;

[0020] Figure 2 This is a perspective view of the motorcycle frame described in the embodiment;

[0021] Figure 3 This is a schematic diagram (A) of the explosion of the cantilever structure in the motorcycle frame described in the embodiment;

[0022] Figure 4 for Figure 3 Enlarged view of point V in the middle;

[0023] Figure 5 This is a schematic diagram (B) illustrating the explosion of the cantilever structure in the motorcycle frame described in the embodiment.

[0024] Figure 6 for Figure 5 Enlarged view of point W in the middle;

[0025] Figure 7 for Figure 5 Enlarged view of point X in the middle;

[0026] Figure 8 This is a schematic diagram (C) of the explosion of the cantilever structure in the motorcycle frame described in the embodiment;

[0027] Figure 9 for Figure 8 Enlarged view of point Y in the middle;

[0028] Figure 10 for Figure 8 Enlarged view of point Z in the middle;

[0029] The components include: transverse cantilever 1, front connector 2, rear connector 3, front mounting position 4, rear mounting position 5, front handle 6, rear handle 7, rib 8, flange 9, reinforcing rib 10, front mounting hole 11, rear mounting hole 12, connecting plate 13, front connecting hole 14, connecting sleeve 15, front connector 16, rear connector 17, receiving groove 18, nut 19, first bolt 20, second bolt 21, upper horizontal tube 22, lower horizontal tube 23, oblique reinforcing tube 24, vertical tube 25, front main beam 26, rear oblique beam 27, front mounting plate 28, rear mounting plate 29, and limiting plate 30. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0031] Example:

[0032] Please see Figure 2 and Figure 3 A motorcycle cantilever structure includes two symmetrically distributed lateral cantilever arms 1. A front connector 2 is connected between the front ends of the two lateral cantilever arms 1, and a rear connector 3 is connected between the rear ends. The front connector 2 and the rear connector 3 are provided with a front mounting position 4 and a rear mounting position 5 for connecting to the frame. The lateral cantilever arms 1 are made of metal, and the front connector 2 and the rear connector 3 are both made of reinforced plastic.

[0033] The motorcycle cantilever structure of this utility model connects the front ends of the left and right lateral cantilever arms 1 of the frame via a front connector 2, and the rear ends of the left and right lateral cantilever arms 1 of the frame via a rear connector 3, forming a stable and reliable cantilever structure. The cantilever structure is connected to the motorcycle frame via the front connector 2 and the rear connector 3, ensuring the reliability of the connection between the lateral cantilever arms 1 and the motorcycle frame. Since resonance occurs when the external excitation frequency is within a certain multiple of the material's inherent frequency, and the material's inherent frequency is related to its elastic modulus and density, this utility model designs the lateral cantilever arms 1, which are visible in the overall vehicle configuration, to be made of metal. This avoids affecting the aesthetics of the motorcycle's appearance. The front connector 2 and rear connector 3, which connect the cantilever 1 to the frame and are not visible in appearance, are made of reinforced plastic. Due to the influence of elastic modulus and density, the natural frequency of reinforced plastic differs significantly from that of metal materials. This not only effectively reduces the possibility of resonance between the front connector 2 and rear connector 3 and the lateral cantilever 1 and motorcycle frame at the motorcycle's operating frequency band, thereby optimizing the overall vehicle mode, but also, thanks to the lightweight and high-strength characteristics of reinforced plastic, it helps to reduce the overall vehicle weight while ensuring the load-bearing strength of the lateral cantilever 1. Therefore, the motorcycle cantilever structure described in this utility model can effectively solve the problem that existing cantilever structures cannot simultaneously meet the requirements of appearance and overall mode, and achieve the effect of ensuring the appearance of the motorcycle and improving the overall mode.

[0034] Reinforced plastics, also known as engineering plastics, typically consist of a base resin (such as PA6, PA66, and PBT) and reinforcing fillers (such as glass fiber and mineral fillers). Reinforced plastics improve the physical and mechanical properties of the base resin by adding fillers to meet the requirements of specific applications. In practice, reinforced plastics can use PA6+GF20, PA66+GF20, PPA+GF, PBT+GF, PC+GF, and PPS+GF. Here, PA6 refers to Nylon 6 (i.e., polyamide 6), GF refers to glass fiber, and PA6... 6 refers to Nylon 66, PPA refers to polyphthalamide, PBT refers to polybutylene terephthalate, PC refers to polycarbonate, and PPS refers to polyphenylene sulfide. PA6+GF20 can also be expressed as PA6 / 20%GF, indicating that it contains 20% glass fiber. Nylon 6 reinforced with glass fiber has high strength, rigidity, dimensional stability, and heat resistance, while maintaining the good toughness of nylon. It is usually used in applications that require high strength and high rigidity, such as automotive parts, electronic and electrical products, and mechanical parts.

[0035] In this embodiment, the transverse cantilever 1 is made of steel, and the reinforcing plastic is PA6 / 20%GF. The natural frequency of the material is related to the elastic modulus and density of the material. The natural frequency of steel is 5050, and the natural frequency of PA6 / 20%GF is 2673. Resonance will occur when the external excitation frequency is between 0.75 and 1.25 times the natural frequency of the material. The natural frequencies of the front connector 2 and the rear connector 3 made of PA6 / 20%GF are much lower than those of the transverse cantilever 1 and the motorcycle frame made of steel. This can effectively reduce the possibility of the front connector 2 and the rear connector 3 resonating at the same frequency with the transverse cantilever 1 and the motorcycle frame in the operating frequency band of the motorcycle. This is beneficial to improving the reliability of the connection between the transverse cantilever 1 and the motorcycle frame and avoiding the impact on the overall mode of the motorcycle frame.

[0036] Please see Figure 3 and Figure 4 The front connector 2 has an arc-shaped structure and includes a front handlebar 6, a front bow arm, and a front bow tip. The front mounting position 4 is located on the front handlebar 6, the front bow arm bends backward, and the front bow tip is connected to the lateral cantilever 1. The rear connector 3 has an arc-shaped structure and includes a rear handlebar 7, a rear bow arm, and a rear bow tip. The rear mounting position 5 is located on the rear handlebar 7, the rear bow arm bends upward, and the rear bow tip is connected to the lateral cantilever 1. In this way, both the front connector 2 and the rear connector 3 are designed as arc-shaped structures, which facilitates the elastic deformation of the front connector 2 and the rear connector 3 made of reinforced plastic when subjected to impact, thereby playing a buffering and shock-absorbing role. In addition, the bow arms of the front connector 2 and the rear connector 3 bend backward and upward respectively, so that the front connector 2 and the rear connector 3 are mainly used to absorb the impact forces in the front-rear direction and vertical direction, respectively, which helps to improve the reliability of the motorcycle cantilever structure.

[0037] Please see Figure 8 and Figure 9 The front bow arm has a U-shaped cross-section with the opening facing downwards; further, please refer to 7 and Figure 9 The front and rear sides of the front bow arm have protruding ribs 8 that extend with the bending of the front bow arm; in this way, while ensuring the structural strength of the front connector 2, it is beneficial to reduce the weight of the front connector 2.

[0038] Please see Figure 6 and Figure 10 The rear bow arm has an I-shaped cross-section and includes flanges 9 and a web. The two flanges 9 are distributed vertically, and the web is connected between the two flanges 9. Furthermore, on the front and rear sides of the web, a number of reinforcing ribs 10 are connected between the two flanges 9 respectively. The number of reinforcing ribs 10 are distributed at intervals along the bending direction of the rear bow arm. In this way, while ensuring the structural strength of the rear connector 3, it is beneficial to reduce the weight of the rear connector 3. In this embodiment, reinforcing ribs are also provided on the inner side of the opening of the front bow arm.

[0039] Please see Figure 9 and Figure 10 The front handlebar 6 has a through front mounting hole 11 forming a front mounting position 4, and the rear handlebar 7 has a through rear mounting hole 12 forming a rear mounting position 5, so that the front connector 2 and the rear connector 3 can be connected to the frame by bolts.

[0040] Please see Figure 1 and Figure 5 The transverse cantilever 1 has a connecting plate 13 at its front end, with a front connecting hole 14 extending through the left and right directions. The transverse cantilever 1 has a connecting sleeve 15 at its rear end, with a rear connecting hole extending through the left and right directions. A front bow tip forms a front connecting head 16, and a rear bow tip forms a rear connecting head 17. Both the front and rear connecting heads 16 and 17 have receiving grooves 18, with nuts 19 embedded within them. The nut 19 on the front connecting head 16 is coaxial with the front connecting hole 14. The connecting plate 13 is connected to the front connecting head 16 via a first bolt 20 passing through the front connecting hole 14 and threadedly connected to the corresponding nut 19. The rear connecting... The nut 19 on the head 17 is coaxial with the rear connecting hole, and the connecting sleeve 15 is connected to the front connecting head 16 by a second bolt 21 that passes through the rear connecting hole and is threaded to the corresponding nut 19; specifically, in this embodiment, the transverse cantilever 1 includes an upper horizontal tube 22 and a lower horizontal tube 23 arranged in the front-rear direction. The upper horizontal tube 22 and the lower horizontal tube 23 are distributed vertically at intervals. Multiple oblique reinforcing tubes 24 are connected between the upper horizontal tube 22 and the lower horizontal tube 23. The connecting plate 13 is connected and disposed between the front ends of the upper horizontal tube 22 and the lower horizontal tube 23. The rear end of the upper horizontal tube 22 bends downward and extends to connect with the rear end of the lower horizontal tube 23. The connecting sleeve 15 is connected and disposed at the rear end of the upper horizontal tube 22.

[0041] In this way, the front connector 2 and the rear connector 3, both made of reinforced plastic, are fitted with nuts 19 through the receiving groove 18, so that the front connector 2 is reliably connected to the connecting plate 13 at the front end of the transverse cantilever 1 by bolts, and the rear connector 3 is reliably connected to the connecting sleeve 15 at the rear end of the transverse cantilever 1 by bolts, which helps to improve the reliability of the motorcycle cantilever structure.

[0042] To facilitate a further understanding of the motorcycle cantilever structure described in this utility model, a motorcycle frame containing this cantilever structure is described below: Please refer to Figure 1 and Figure 2 The motorcycle frame includes a front main beam 26 and a rear diagonal beam 27. The front main beam 26 is a beam connected below the riser tube 25 and inclined rearward. The front main beam 26 is mainly used to provide a mounting position for the motorcycle's engine. The rear diagonal beam 27 is a beam extending downward and inclined rearward in the middle of the frame. The rear diagonal beam 27 is mainly used to provide a mounting position for the motorcycle's engine and to mount the rear swingarm. Please see [link to relevant documentation]. Figure 3 and Figure 4A front mounting plate 28 is provided on the front side of the main beam 26, and a rear mounting plate 29 is provided on the front side of the rear diagonal beam 27. Both the front mounting plate 28 and the rear mounting plate 29 have threaded holes arranged in the front-rear direction. The front connector 2 has bolts passing through the front mounting hole 11 and threadedly connected to the threaded hole on the front mounting plate 28. The rear connector 3 has bolts passing through the rear mounting hole 12 and threadedly connected to the threaded hole on the rear mounting plate 29, thereby mounting the motorcycle cantilever structure onto the frame body. In this embodiment, the rear mounting plate 29 is U-shaped. The structure is welded to the rear inclined beam 27 with the opening facing rearward. Threaded holes are also provided on the left and right side plates of the rear mounting plate 29. The rear handlebar 7 protrudes to form two limiting plates 30. The two limiting plates 30 are spaced apart and their width matches the width of the rear mounting plate 29. The rear mounting plate 29 is located between the two limiting plates 30. Bolts that are threaded into the limiting plates 30 and connected to the threaded holes on the side plates of the rear mounting plate 29 are provided. In this way, the frame provides a stable and reliable mounting position for the motorcycle cantilever structure through the front mounting plate 28 and the rear mounting plate 29.

[0043] In summary, the front connector 2 and rear connector 3 for connecting the transverse cantilever 1 to the vehicle frame in this utility model are made of reinforced plastic. The reinforced plastic is a lightweight polymer material with a natural frequency much lower than that of the metal structure. This ensures that the connection between the transverse cantilever 1 and the vehicle frame meets the strength requirements while reducing the natural frequency. This not only guarantees the load-bearing strength of the transverse cantilever 1, but also helps to reduce the possibility of resonance affecting the overall vehicle mode.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A motorcycle cantilever structure, characterized in that: It includes two symmetrically distributed lateral cantilever arms. The front ends of the two lateral cantilever arms are connected by a front connector, and the rear ends are connected by a rear connector. The front connector and the rear connector are respectively provided with front mounting positions and rear mounting positions for connection with the vehicle frame. The lateral cantilever arms are made of metal, and the front connector and the rear connector are both made of reinforced plastic.

2. The motorcycle cantilever structure according to claim 1, characterized in that: The reinforced plastic is PA6 / 20%GF.

3. The motorcycle cantilever structure according to claim 2, characterized in that: The front connector has an arc-shaped structure and includes a front bow handle, a front bow arm, and a front bow tip. The front mounting position is located on the front bow handle, the front bow arm bends backward, and the front bow tip is connected to the lateral cantilever. The rear connector has an arc-shaped structure and includes a rear bow handle, a rear bow arm, and a rear bow tip. The rear mounting position is located on the rear bow handle, the rear bow arm bends upward, and the rear bow tip is connected to the lateral cantilever.

4. The motorcycle cantilever structure according to claim 3, characterized in that: The front bow arm has a U-shaped cross-section with the opening facing downwards.

5. The motorcycle cantilever structure according to claim 4, characterized in that: Both the front and rear sides of the front bow arm have protruding ribs that extend as the front bow arm bends.

6. The motorcycle cantilever structure according to claim 3, characterized in that: The cross-section of the rear boom is I-shaped and includes a flange and a web. The two flanges are distributed vertically, and the web connects the two flanges.

7. The motorcycle cantilever structure according to claim 6, characterized in that: Several reinforcing ribs are connected between the two flanges on the front and rear sides of the web, and the reinforcing ribs are distributed at intervals along the direction of the bending extension of the rear bow arm.

8. The motorcycle cantilever structure according to claim 3, characterized in that: The front handlebar has a through-hole for front mounting and forms a front mounting position, and the rear handlebar has a through-hole for rear mounting and forms a rear mounting position, so that the front and rear connectors can be connected to the frame by bolts.

9. The motorcycle cantilever structure according to claim 3, characterized in that: The front end of the transverse cantilever is provided with a connecting plate, which has a front connecting hole extending in the left-right direction. The rear end of the transverse cantilever is provided with a connecting sleeve, which has a rear connecting hole extending in the left-right direction. The front bow tip forms a front connecting head, and the rear bow tip forms a rear connecting head. The front and rear connecting heads are respectively provided with receiving grooves, and nuts are embedded in the receiving grooves. The nut on the front connecting head is coaxial with the front connecting hole. The connecting plate is connected to the front connecting head by a bolt that passes through the front connecting hole and is threaded to the corresponding nut. The nut on the rear connecting head is coaxial with the rear connecting hole. The connecting sleeve is connected to the front connecting head by a bolt that passes through the rear connecting hole and is threaded to the corresponding nut.

10. A motorcycle frame, characterized in that: It includes a front main beam, a rear inclined beam, and a motorcycle cantilever structure as described in any one of claims 1-9, wherein the front connector is connected to the front main beam via a front mounting position, and the rear connector is connected to the rear inclined beam via a rear mounting position.

Images