A type of front mudguard for shared bicycles

Abstract

This utility model discloses a front fender for shared bicycles, belonging to the field of shared bicycle technology. The front fender includes a corrugated leading edge, a plate, and a wing section. The leading edge is fixedly connected to the plate, and the wing section is fixedly connected to the end of the plate away from the leading edge. When riding a shared bicycle, the airflow passes sequentially through the leading edge, plate, and wing section. The leading edge divides the concentrated airflow into multiple small vortices, and the wing section reduces the intensity of the wingtip vortex. This utility model divides the concentrated water flow into multiple small vortices, breaking the formation of large-scale vortices and delaying the airflow separation point, reducing the wake turbulent kinetic energy by 50%, suppressing the generation of Karman vortex streets, and simultaneously suppressing separation, blocking the path of high-frequency howling.

Description

Technical Field

[0001] This utility model belongs to the field of shared bicycle technology, and in particular relates to a front mudguard for shared bicycles. Background Technology

[0002] As a core tool for short-distance urban transportation, the riding comfort and maintenance costs of shared bicycles directly impact user experience and operational efficiency. Traditional front fenders have significant design flaws, primarily in the following aspects:

[0003] The traditional flat leading edge generates strong airflow separation during riding, forming a Karman vortex street, resulting in high-frequency wind whistling, which accounts for more than 65% of the noise sources during riding.

[0004] The existing solution uses thickened rubber edges, which only reduces noise by 3-5dB and increases wind resistance.

[0005] Therefore, there is an urgent need to design a front mudguard for shared bicycles to solve the problems mentioned above. Utility Model Content

[0006] The purpose of this utility model is to provide a front mudguard for shared bicycles, which has the advantages of dividing concentrated airflow into multiple small vortices and reducing noise, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the specific technical solution of this utility model for a front mudguard of a shared bicycle is as follows:

[0008] A shared bicycle front fender includes a corrugated leading edge, a plate, and a wing section. The leading edge is fixedly connected to the plate, and the end of the plate away from the leading edge is fixedly connected to the wing section. When riding the shared bicycle, the airflow passes through the leading edge, the plate, and the wing section in sequence. The leading edge divides the concentrated airflow into multiple small vortices, and the wing section reduces the intensity of the wingtip vortices.

[0009] Furthermore, multiple sets of protrusions are provided on the leading edge, which divide the concentrated water flow into multiple small eddies, breaking the formation of large-scale eddies.

[0010] Furthermore, the angle of the wing section is the angle at which it tilts upward relative to the horizontal driving plane, and the lateral tilt angle between the wing section and the mudguard is 45 degrees.

[0011] Furthermore, a vibration damping section is fixedly connected to the inner wall of the plate to reduce the resonance value. A buffer section is fixedly connected inside the vibration damping section to reduce impact noise.

[0012] Furthermore, the vibration damping section includes, from the outside to the inside, a high-damping butyl rubber layer, a constraint layer, and a porous sound-absorbing resin layer. The high-damping butyl rubber layer is fixedly connected to the inner wall of the plate. The end of the high-damping butyl rubber layer away from the plate is fixedly connected to the constraint layer. The end of the constraint layer away from the high-damping butyl rubber layer is fixedly connected to the porous sound-absorbing resin layer.

[0013] Furthermore, the buffer section comprises, from the outside to the inside, an aramid fiber layer, a shear-thickening fluid gel layer, and a microporous polyurethane foam layer. The aramid fiber layer is fixedly connected to the porous sound-absorbing resin layer. The end of the aramid fiber layer away from the porous sound-absorbing resin layer is fixedly connected to the shear-thickening fluid gel layer. The end of the shear-thickening fluid gel layer away from the aramid fiber layer is fixedly connected to the microporous polyurethane foam layer.

[0014] Furthermore, a support member is fixedly connected to the plate, an insert is fixedly connected to the support member, and a locking part is fixedly connected to the front fork. When the insert is inserted into the locking part, the locking part engages the insert.

[0015] Furthermore, the insert includes an insert block with a slot, and when the insert is inserted into the card part, the card part engages with the slot.

[0016] Furthermore, a conical block is fixedly connected to the insert, and the large-diameter end of the conical block is connected to the slot.

[0017] Furthermore, the card part includes a connecting block, the connecting block has a cavity for the insertion part to be inserted, the cavity has a card slot, a card block is slidably connected in the card slot, a spring is fixedly connected to the card block, the end of the spring away from the card block is fixedly connected to the card slot, and the card block engages with the slot.

[0018] This invention has the following advantages: it divides the concentrated water flow into multiple small eddies, breaks the formation of large-scale vortices, delays the airflow separation point, reduces the wake turbulent kinetic energy by 50%, suppresses the generation of the Karman vortex street, and simultaneously suppresses separation, blocking the path of high-frequency howling. Attached Figure Description

[0019] Figure 1 This is a front view schematic diagram of the front mudguard structure of this utility model;

[0020] Figure 2 This is a top view schematic diagram of the front mudguard structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the snap-fit ​​structure between the insert and the snap-fit ​​part of this utility model;

[0022] Figure 4 This is a schematic diagram of the vibration damping section and buffer section of this utility model;

[0023] The markings in the diagram are as follows: 1. Plate; 11. Support; 12. Insert; 121. Insert block; 122. Slot; 123. Conical block; 2. Leading edge; 3. Wing; 4. Connecting block; 41. Cavity; 42. Slot; 43. Spring; 44. Block; 5. Vibration damping section; 51. High-damping butyl rubber layer; 52. Constraint layer; 53. Porous sound-absorbing resin layer; 6. Buffer section; 61. Aramid fiber layer; 62. Shear-thickening fluid gel layer; 63. Microporous foamed polyurethane layer. Detailed Implementation

[0024] 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. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0026] The following is a reference to the appendix. Figure 1 To be continued Figure 4 This utility model describes a front mudguard for a shared bicycle.

[0027] The traditional flat leading edge generates strong airflow separation during riding, forming a Karman vortex street, resulting in high-frequency wind whistling, which accounts for more than 65% of the noise sources during riding.

[0028] The existing solution uses thickened rubber edges, which only reduces noise by 3-5dB and increases wind resistance.

[0029] Therefore, this front fender includes a corrugated leading edge 2, a plate 1, and a wing 3. The leading edge 2 is fixedly connected to the plate 1, and the wing 3 is fixedly connected to the end of the plate 1 away from the leading edge 2. When riding a shared bicycle, the airflow passes through the leading edge 2, the plate 1, and the wing 3 in sequence. The leading edge 2 divides the concentrated airflow into multiple small vortices, and the wing 3 reduces the intensity of the wingtip vortex. Specifically, the front end of the leading edge 2 is 10mm outside the front end of the plate 1, and the corrugations of the leading edge 2 extend 5mm to the two sides of the plate 1.

[0030] The leading edge 2 is provided with multiple sets of protrusions, which divide the concentrated water flow into multiple small vortices, break the formation of large-scale vortices, delay the airflow separation point, reduce the wake turbulence kinetic energy by 50%, and suppress the generation of Karman vortex street.

[0031] The angle of the wing section 3 is the angle of upward tilt relative to the horizontal driving plane. The lateral tilt angle between the wing section 3 and the mudguard is 45 degrees, thereby suppressing separation and blocking the path of high-frequency whistling.

[0032] In existing technologies, the natural frequency of the mudguard overlaps with the rotational frequency of the wheel, causing resonance noise. Traditional bolted connections have a loosening rate of up to 23% per month under bumpy road conditions.

[0033] Steel plate structures transmit road impact noise, with gravel impact noise exceeding 100dB, while foam patch buffer layers have a lifespan of less than 3 months.

[0034] Therefore, a vibration damping section 5 is fixedly connected to the inner wall of the plate 1 to reduce the resonance value. A buffer section 6 is fixedly connected inside the vibration damping section 5 to reduce impact noise.

[0035] The vibration damping section 5 includes, from the outside to the inside, a high-damping butyl rubber layer 51, a constraint layer 52, and a porous sound-absorbing resin layer 53. The high-damping butyl rubber layer 51 is fixedly connected to the inner wall of the plate part 1. The end of the high-damping butyl rubber layer 51 away from the plate part 1 is fixedly connected to the constraint layer 52. The end of the constraint layer 52 away from the high-damping butyl rubber layer 51 is fixedly connected to the porous sound-absorbing resin layer 53. Specifically, the high-damping butyl rubber layer 51 converts vibration energy into heat energy, the constraint layer 52 blocks the vibration propagation, and the sound waves in the porous sound-absorbing resin layer 53 are dissipated when they enter the holes.

[0036] The buffer section 6 comprises, from the outside to the inside, an aramid fiber layer 61, a shear-thickening fluid gel layer 62, and a microporous foamed polyurethane layer 63. The aramid fiber layer 61 is fixedly connected to the porous sound-absorbing resin layer 53. The end of the aramid fiber layer 61 away from the porous sound-absorbing resin layer 53 is fixedly connected to the shear-thickening fluid gel layer 62. The end of the shear-thickening fluid gel layer 62 away from the aramid fiber layer 61 is fixedly connected to the microporous foamed polyurethane layer 63. Specifically, the aramid fiber layer 61 provides support, the shear-thickening fluid gel layer 62 hardens instantly upon impact, and the microporous foamed polyurethane layer 63 absorbs the impact energy of the gravel.

[0037] A support member 11 is fixedly connected to the plate part 1, and an insertion part 12 is fixedly connected to the support member 11. A locking part is fixedly connected to the front fork. When the insertion part 12 is inserted into the locking part, the locking part locks the insertion part 12.

[0038] The insertion part 12 includes an insertion block 121, on which a slot 122 is provided. When the insertion part 12 is inserted into the card part, the card part engages with the slot 122. A conical block 123 is fixedly connected to the insertion block 121, and the large-diameter end of the conical block 123 is connected to the slot 122.

[0039] The card part includes a connecting block 4, which has a cavity 41 for the insertion part 12 to be inserted into. The cavity 41 has a slot 42, and a card block 44 is slidably connected in the slot 42. A spring 43 is fixedly connected to the card block 44, and the end of the spring 43 away from the card block 44 is fixedly connected to the slot 42. The card block 44 engages with the slot 122.

[0040] The insertion part 12 and the locking part facilitate the connection between the front fender and the front fork, while also preventing the front fender from becoming loose and causing noise during operation.

[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A front mudguard for a shared bicycle, characterized in that, It includes a corrugated leading edge (2), a plate (1) and a wing section (3). The leading edge (2) is fixedly connected to the plate (1). The end of the plate (1) away from the leading edge (2) is fixedly connected to the wing section (3). When riding a shared bicycle, the airflow passes through the leading edge (2), the plate (1) and the wing section (3) in sequence. The leading edge (2) divides the concentrated airflow into multiple small vortices, and the wing section (3) reduces the intensity of the wingtip vortex.

2. The shared bicycle front mudguard according to claim 1, characterized in that, The leading edge (2) is provided with multiple sets of protrusions, which divide the concentrated water flow into multiple small eddies, breaking the formation of large-scale eddies.

3. The shared bicycle front mudguard according to claim 1, characterized in that, The angle of the wing section (3) is the angle of upward tilt relative to the horizontal driving plane, and the lateral tilt angle between the wing section (3) and the mudguard is 45 degrees.

4. The shared bicycle front mudguard according to claim 1, characterized in that, A vibration damping section (5) is fixedly connected to the inner wall of the plate (1) to reduce the resonance value. A buffer section (6) is fixedly connected inside the vibration damping section (5) to reduce impact noise.

5. The shared bicycle front mudguard according to claim 4, characterized in that, The vibration damping section (5) includes, from the outside to the inside, a high-damping butyl rubber layer (51), a restraint layer (52), and a porous sound-absorbing resin layer (53). The high-damping butyl rubber layer (51) is fixedly connected to the inner wall of the plate (1). The end of the high-damping butyl rubber layer (51) away from the plate (1) is fixedly connected to the restraint layer (52). The end of the restraint layer (52) away from the high-damping butyl rubber layer (51) is fixedly connected to the porous sound-absorbing resin layer (53).

6. The shared bicycle front mudguard according to claim 5, characterized in that, The buffer section (6) comprises, from the outside to the inside, an aramid fiber layer (61), a shear-thickening fluid gel layer (62), and a microporous foamed polyurethane layer (63). The aramid fiber layer (61) is fixedly connected to the porous sound-absorbing resin layer (53). The end of the aramid fiber layer (61) away from the porous sound-absorbing resin layer (53) is fixedly connected to the shear-thickening fluid gel layer (62). The end of the shear-thickening fluid gel layer (62) away from the aramid fiber layer (61) is fixedly connected to the microporous foamed polyurethane layer (63).

7. The shared bicycle front mudguard according to claim 1, characterized in that, A support member (11) is fixedly connected to the plate (1), and an insert (12) is fixedly connected to the support member (11). A locking part is fixedly connected to the fork. When the insert (12) is inserted into the locking part, the locking part locks the insert (12).

8. The shared bicycle front mudguard according to claim 7, characterized in that, The insertion part (12) includes an insertion block (121), and the insertion block (121) has a slot (122). When the insertion part (12) is inserted into the card part, the card part engages with the slot (122).

9. The shared bicycle front mudguard according to claim 8, characterized in that, A conical block (123) is fixedly connected to the insert (121). The large-diameter end of the conical block (123) is connected to the slot (122), and the small-diameter end of the conical block (123) guides the insertion.

10. The shared bicycle front mudguard according to claim 8, characterized in that, The card part includes a connecting block (4), the connecting block (4) has a cavity (41) for inserting the insert part (12), the cavity (41) has a slot (42), a card block (44) is slidably connected in the slot (42), a spring (43) is fixedly connected on the card block (44), the end of the spring (43) away from the card block (44) is fixedly connected to the slot (42), and the card block (44) engages with the slot (122).

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