Front mudguard mounting structure of cross-country motorcycle
By using a double-layer plate structure and a tie spring bolt design, the connection stability and mud and sand accumulation problems of the motorcycle front fender when driving on complex road surfaces are solved, improving installation reliability and durability, while reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LUOYANG NORTHERN EK CHOR MOTORCYCLE CO LTD
- Filing Date
- 2026-03-30
- Publication Date
- 2026-05-08
AI Technical Summary
The existing motorcycle front fender mounting structure has insufficient connection stability when driving on complex road surfaces, is prone to loosening, and the accumulation of mud and sand affects vehicle performance. The manufacturing process is also complex and costly.
The system adopts a double-layer plate structure consisting of a bracket mounting plate and a mounting sub-plate, combined with tension spring bolts to achieve elastic connection. Vibration is absorbed by the compression spring, the dynamic gap is adjusted, and the processing technology is simplified.
It improves the installation reliability and durability of the front mudguard, reduces the risk of loosening, reduces mud and sand accumulation, and simplifies production costs and assembly processes.
Smart Images
Figure FT_1 
Figure FT_2 
Figure FT_3
Abstract
Description
Technical Field
[0001] This invention belongs to the field of motorcycle technology and mainly relates to a front fender mounting structure for off-road motorcycles. Background Technology
[0002] The front fender of a motorcycle, as a key component in the overall exterior decoration and functional protection system, plays a crucial role in effectively blocking and isolating mud, sewage, and other debris from splashing upwards from the front wheel during vehicle operation, thus maintaining the rider's appearance and keeping part of the motorcycle clean. In the overall interior and exterior design of a motorcycle, the connection between the front fender and its mounting structure is fundamental to ensuring the component's stable, precise assembly and long-term effectiveness. However, currently common front fender mounting solutions have several significant shortcomings and areas for improvement: First, they lack sufficient connection stability and structural rigidity at the mounting point. When motorcycles, especially off-road motorcycles, travel at high speeds on complex and bumpy roads, continuous and severe vibrations can easily cause fatigue loosening of connecting parts (such as screws, clips, or brackets), leading to overall or partial detachment or displacement of the fender. This not only affects the function of the component itself but may also pose a potential threat to the motorcycle's safe operation and overall stability. Second, in common designs, the lower edge of the front fender and the tire tread... The reserved clearances are generally too narrow. In harsh road conditions such as mud and gravel, the mud and sand that are splashed up can easily accumulate and harden quickly in this narrow space. This will not only significantly increase the rolling resistance of the front wheels, affecting the vehicle's power performance and handling agility, but long-term accumulation may also cause abnormal wear on the tires and surrounding components. Finally, from the perspective of production and on-site assembly, the existing structural designs are often lacking in manufacturability. The parts may be too complex or have too high requirements for assembly precision. This not only increases the processing difficulty and manufacturing cost in the production process, but also makes the disassembly and replacement operations during maintenance cumbersome and inefficient. Summary of the Invention
[0003] To address the shortcomings of the existing technology, the present invention aims to provide a front fender mounting structure for off-road motorcycles. By optimizing the support connection system and gap adjustment mechanism, the present invention solves the problems of insufficient stability, mud and sand accumulation, and high process costs of the existing structure, thereby improving the installation reliability and durability of the front fender and simplifying the assembly process to reduce manufacturing costs.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A front fender mounting structure for an off-road motorcycle includes a bracket mounting plate disposed at the lower part of the motorcycle steering column assembly; the bracket mounting plate is a polygonal plate structure, with 90-degree bent flanged ears at both ends of its front panel; the flanged ears are also provided with mounting holes; the top four corners of the bracket mounting plate are provided with evenly distributed projection weld nuts, and symmetrically arranged stepped countersunk holes are provided between the projection weld nuts; the bottom of the bracket mounting plate is also provided with a mounting sub-plate assembly connected thereto.
[0005] The mounting sub-plate assembly includes a mounting sub-plate, which is disposed at the lower part of the bracket mounting plate. The mounting sub-plate has a polygonal structure and is the same shape and volume as the bracket mounting plate. The two are connected to each other by symmetrically arranged tension spring bolts.
[0006] The mounting plate has evenly distributed projection weld nuts at the four corners of its top surface, and symmetrically arranged stepped countersunk holes between the projection weld nuts.
[0007] The top of the tension spring bolt is inserted into the stepped countersunk hole of the bracket mounting plate, and the bottom is inserted into the stepped countersunk hole of the mounting sub-plate. Matching positioning nuts are provided at the top and bottom of the bolt for fastening.
[0008] The main body of the tension spring bolt is a double-ended threaded bolt, and a fixing block arranged vertically is sleeved in the middle of it. A compression spring is arranged between the fixing blocks. The compression spring surrounds the outside of the double-ended threaded bolt. The two ends of the fixing block are fastened by positioning nuts.
[0009] The lower part of the bracket mounting plate is connected to a front mudguard.
[0010] The lower part of the mounting plate is connected to a front mudguard.
[0011] The bracket mounting plate and mounting sub-plate can be hexagonal plate structures.
[0012] Both the bracket mounting plate and the mounting sub-plate are formed by one-time stamping.
[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention employs a double-layer plate structure consisting of a bracket mounting plate and a mounting sub-plate, coupled with tension spring bolts for elastic connection, constructing a support system with dynamic buffering capabilities. When the vehicle travels on bumpy roads, the compression springs effectively absorb and dampen impact vibrations from the front wheels, avoiding the loosening of connectors caused by continuous vibrations in traditional rigid connections. This significantly improves the overall rigidity and connection stability of the front fender mounting structure, reducing the risk of loosening. Simultaneously, the double-layer plate structure, through the elastic adjustment of the spring bolts, can accommodate tires of different diameters, maintaining a dynamic gap between the front fender and the tire tread during driving. This effectively prevents mud and sand from accumulating and hardening in confined spaces, reducing front wheel rolling resistance and abnormal wear. Furthermore, both the bracket mounting plate and the mounting sub-plate are formed using a one-time stamping process, simplifying the parts processing flow and reducing the precision requirements of the assembly stage. This not only lowers manufacturing costs but also improves the efficiency of disassembly and replacement during maintenance, achieving the dual benefits of functional improvement and process optimization. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the tension spring bolt structure in this invention; Figure 4 This is a schematic diagram of the assembly and use of the present invention.
[0015] In the diagram: 1. Bracket mounting plate; 2. Flanged ear plate; 3. Projection weld nut; 4. Stepped countersunk hole; 5. Mounting sub-plate; 6. Pull spring bolt; 7. Positioning nut; 8. Double-ended threaded bolt; 9. Fixing block; 10. Compression spring; 11. Front fender; 12. Motorcycle steering column assembly; 13. Mounting hole. Detailed Implementation
[0016] The invention will be described in conjunction with the accompanying drawings.
[0017] First, it should be noted that the orientations or positional relationships indicated by terms such as "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer" used in describing the structure of this invention are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0018] like Figures 1-4The diagram illustrates a front fender mounting structure for an off-road motorcycle, comprising a bracket mounting plate 1 located below a steering column assembly 12; a front fender 11 is connected to the lower part of the bracket mounting plate 1; the front fender 11 can be directly installed on the lower part of the bracket mounting plate 1 according to the actual needs of the tire model; the bracket mounting plate 1 is a polygonal plate structure, with 90-degree bent flanged ear plates 2 at both ends of its panel; mounting holes 13 are also provided on the flanged ear plates 2; the flanged ear plates 2 and mounting holes 13 are designed to be fitted onto the steering column assembly 14, thereby enhancing connection stability; the top four corners of the bracket mounting plate 1 are provided with evenly distributed projection weld nuts 3, and symmetrically arranged stepped countersunk holes 4 are provided between the projection weld nuts 3; the projection weld nuts 3 are designed for subsequent bolt fixing; a mounting sub-plate assembly is also provided at the bottom of the bracket mounting plate 1; the mounting sub-plate assembly is used to assist in supporting and reinforcing the entire fender.
[0019] The mounting sub-plate assembly includes a mounting sub-plate 5, the lower part of which is connected to a front fender 11. The mounting sub-plate 5 is located below the bracket mounting plate 1. The mounting sub-plate 5 has a polygonal structure and the same shape and volume as the bracket mounting plate 1. The two are connected to each other by symmetrically arranged tie spring bolts 6. With the elastic preload of the tie spring bolts 6, longitudinal vibration can be absorbed when the motorcycle is riding bumpy, avoiding loosening of parts caused by rigid connection. The bracket mounting plate 1 and the mounting sub-plate 5 can be hexagonal plate structures. Both the bracket mounting plate 1 and the mounting sub-plate 5 are one-time stamped plate parts.
[0020] The mounting plate 5 has four evenly distributed projection weld nuts 3 at the top corners, and symmetrically arranged stepped countersunk holes 4 between the projection weld nuts 3. These projection weld nuts 3 correspond one-to-one with the projection weld nuts 3 on the top of the bracket mounting plate 1, forming a bolt connection channel that runs vertically through the plate. The symmetrically arranged stepped countersunk holes 4 are used to accommodate the heads of the tension spring bolts 6. The stepped structure of the countersunk holes restricts the lateral displacement of the bolts, ensuring the stability of the connection nodes during vehicle operation. The top of the tension spring bolt 6 is inserted into the stepped countersunk hole 4 of the bracket mounting plate 1, and the bottom is inserted into the stepped countersunk hole 4 of the mounting sub-plate 5. Matching positioning nuts 7 are provided at the top and bottom of the bolt for fastening. Through the synchronous pre-tightening of the upper and lower positioning nuts 7, the compression of the spring bolt 6 can be precisely controlled, so that the tension spring bolt 6 always maintains the set elastic pre-tightening force. When the motorcycle experiences bumps on different road conditions, the bolt's extension and contraction can be dynamically adjusted to effectively buffer longitudinal impact force. At the same time, in conjunction with the stepped limiting structure of the stepped countersunk hole 4, the bolt is prevented from deflecting when subjected to lateral force, ensuring that the connection stiffness and flexible support between the bracket mounting plate 1 and the mounting sub-plate 5 achieve the best balance.
[0021] The main body of the tension spring bolt 6 is a double-ended threaded bolt 8, with upper and lower fixing blocks 9 sleeved in its middle. A compression spring 10 is arranged between the fixing blocks 9. The compression spring 10 surrounds the outside of the double-ended threaded bolt 8. The two ends of the fixing blocks 9 are fastened by positioning nuts 7. The positioning nuts 7, through precise thread engagement with the double-ended threaded bolt 8, can synchronously adjust the relative positions of the upper and lower fixing blocks 9 along the bolt axis, thereby precisely controlling the initial compression of the compression spring 10. The fixing blocks 9 have internal threaded holes that perfectly match the bolt threads, ensuring a rigid connection with the bolt. When the positioning nuts 7 are tightened clockwise, the upper and lower fixing blocks 9 move closer to each other, and the compression spring 10 is further compressed and stores energy. When loosened counterclockwise, the fixing blocks 9 separate under the action of the spring's restoring force, and the spring preload decreases accordingly. This mechanical adjustment method can achieve stepless adjustment of the spring force to adapt to the needs of different tire models and vehicle types.
[0022] In use, the bracket mounting plate 1 is first aligned and connected to the pre-set bolt holes at the bottom of the motorcycle steering column assembly 12 via the four corner welded nuts 3 and the flanged ear plates 2. The matching bolts are then screwed into the welded nuts 3 and the flanged ear plates 2 through the mounting holes 13 of the motorcycle steering column assembly 12 to achieve initial fixation of the bracket mounting plate 1. Subsequently, the mounting sub-plate 5 is assembled with the bracket mounting plate 1 via the tie spring bolts 6. At this time, the top of the tie spring bolts 6 is inserted into the stepped countersunk hole 4 of the bracket mounting plate 1, and the bottom is inserted into the stepped countersunk hole 4 of the mounting sub-plate 5. The upper and lower double positioning nuts 7 are pre-tightened simultaneously. According to the vehicle model, tire specifications, and road conditions, the positioning nuts 7 are rotated to adjust the relative position of the fixing blocks 9 so that the compression spring 10 reaches the set initial compression amount, ensuring that the tie spring bolts 6 have a suitable elastic pre-tightening force. After completing the connection between the bracket mounting plate 1 and the mounting sub-plate 5, the front mudguard 11 is fixed to the preset connection points at the lower part of the bracket mounting plate 1 and the lower part of the mounting sub-plate 5, respectively, to form a structure in which the two-layer plate body jointly supports the mudguard. When a motorcycle encounters bumps on off-road terrain, the impact force is transmitted through the tires to the mudguard, and then acts on the mounting plate 5. At this time, the compression spring 10 in the tension spring bolt 6 undergoes elastic deformation under longitudinal force. The spring's extension and contraction absorbs part of the vibration energy. Combined with the synchronous pre-tightening design of the double positioning nuts 7, the bolt extension and contraction can be dynamically adjusted to buffer longitudinal impacts of different intensities. At the same time, the stepped structure of the countersunk hole 4 restricts the lateral displacement of the tension spring bolt 6, preventing the bolt from deflecting when the vehicle is turning or subjected to lateral force. This ensures that the bracket mounting plate 1 and the mounting plate 5 always maintain a stable relative position, effectively preventing the risk of loosening or breakage of parts due to rigid connection. In addition, the bracket mounting plate 1 and the mounting plate 5 adopt the same hexagonal stamping structure, which reduces material redundancy while ensuring structural strength. Combined with the one-time stamping process, it improves the structural consistency and assembly accuracy of the overall components, enabling the mudguard to maintain reliable protective performance under complex road conditions.
[0023] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A front fender mounting structure for an off-road motorcycle, comprising a bracket mounting plate (1) disposed at the lower part of the motorcycle steering column assembly (12); characterized in that: The bracket mounting plate (1) is a polygonal plate structure, with 90-degree bent flanged ear plates (2) at both ends of its panel; mounting holes (13) are also provided on the flanged ear plates (2); the top four corners of the bracket mounting plate (1) are provided with evenly distributed projection weld nuts (3), and symmetrically arranged stepped countersunk holes (4) are provided between the projection weld nuts (3); the bottom of the bracket mounting plate (1) is also provided with a mounting sub-plate (5) assembly connected thereto.
2. The off-road motorcycle front fender mounting structure according to claim 1, characterized in that: The mounting sub-plate (5) assembly includes a mounting sub-plate (5), which is located at the lower part of the bracket mounting plate (1). The mounting sub-plate (5) has a polygonal structure and is the same shape and volume as the bracket mounting plate (1). The two are connected to each other by symmetrically arranged tension spring bolts (6).
3. The off-road motorcycle front fender mounting structure according to claim 1, characterized in that: The mounting sub-plate (5) has four evenly distributed projection weld nuts (3) at the top corners of the plate surface, and symmetrically arranged stepped countersunk holes (4) are provided between the projection weld nuts (3).
4. The off-road motorcycle front fender mounting structure according to claim 2, characterized in that: The top of the tension spring bolt (6) is inserted into the stepped countersunk hole (4) of the bracket mounting plate (1), and its bottom is inserted into the stepped countersunk hole (4) of the mounting sub-plate (5). Matching positioning nuts (7) are provided at the top and bottom of the bolt for fastening.
5. The off-road motorcycle front fender mounting structure according to claim 2, characterized in that: The main body of the pull spring bolt (6) is a double-ended threaded bolt (8), and a fixing block (9) arranged vertically is sleeved in the middle of it. A compression spring (10) is arranged between the fixing blocks (9); the compression spring (10) surrounds the outside of the double-ended threaded bolt (8); the two ends of the fixing block (9) are fastened by positioning nuts (7).
6. The off-road motorcycle front fender mounting structure according to claim 1, characterized in that: The lower part of the bracket mounting plate (1) is connected to a front mudguard (11).
7. The off-road motorcycle front fender mounting structure according to claim 1, characterized in that: The lower part of the mounting plate (5) is connected to the front mudguard (11).
8. The off-road motorcycle front fender mounting structure according to claim 1, characterized in that: The bracket mounting plate (1) and the mounting sub-plate (5) can be hexagonal plate structures.
9. The off-road motorcycle front fender mounting structure according to claim 1, characterized in that: Both the bracket mounting plate (1) and the mounting sub-plate (5) are one-time stamped plate parts.