Bicycle crank

Abstract

The utility model provides a bicycle crank, the surface of the crank is provided with a plurality of concave parts, the plurality of concave parts are arranged on the surface of the crank to form a surface pattern, and the plurality of concave parts can reduce the surface wind resistance of the crank, reduce the riding resistance of a rider, reduce the energy loss to the greatest extent, and improve the riding speed and durability. And therefore, better riding experience is brought.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bicycle accessories, in particular to a bicycle crank. BACKGROUND

[0002] As a core component of the bicycle power transmission system, the bicycle crank plays a crucial role. It directly bears the force generated by the rider's pedaling and efficiently converts this force into kinetic energy to drive the bicycle forward. Therefore, the performance of the crank is directly related to the pedaling efficiency and comfort of the rider, and deeply affects the overall performance of the bicycle. A well-designed crank can minimize energy loss, improve riding speed and endurance, and thus provide a better riding experience.

[0003] For a long time, the manufacture of bicycle cranks has mainly relied on traditional metal materials such as aluminum alloy and steel. Although these materials have certain strength and durability, they have obvious shortcomings in terms of lightweight. Especially in the field of competitive cycling, where extreme performance is pursued, every gram of weight reduction is crucial. A heavy crank not only increases the overall weight of the bicycle, but also directly increases the pedaling burden of the rider, especially when climbing or needing to accelerate quickly. This additional weight will translate into significant resistance, reducing the efficiency of the ride.

[0004] In addition, traditional bicycle cranks are relatively conservative in design, with simple straight rods or slightly curved structures. This design lacks consideration of aerodynamics, especially at high speeds. The friction between the crank and the air will generate a lot of wind resistance, further consuming the rider's energy and limiting the performance of the bicycle at high speeds. For competitive cycling, which pursues speed, reducing wind resistance is a key step to improving performance, and the design of traditional cranks obviously cannot meet this demand.

[0005] In order to overcome the limitations of traditional cranks and meet the demand for high performance of modern bicycles, especially racing bicycles, it is particularly urgent to design a lightweight, low-drag bicycle crank. SUMMARY

[0006] Therefore, in order to solve at least one of the above problems, the utility model provides a bicycle crank.

[0007] The utility model adopts the following scheme to realize:

[0008] The utility model provides a bicycle crank, both ends of the crank are used for connecting the middle shaft and the pedal of the bicycle, the surface of the crank is provided with a plurality of concave parts, a plurality of concave parts are arranged on the surface of the crank, forming a surface pattern.

[0009] Wherein, in one embodiment, the plurality of recesses are arranged on the surface of the crank in an array.

[0010] Wherein, in one embodiment, the plurality of recesses are arranged according to a diamond grid; or, the surface pattern is made into a surface pattern of a golf ball.

[0011] Wherein, in one embodiment, the crank comprises a crank arm body; the crank arm body is provided with a first assembly hole for connecting the middle shaft, and a second assembly hole for connecting the pedal; the surface of the crank is provided with a plurality of recesses arranged along the circumference of the first assembly hole and / or the second assembly hole.

[0012] Wherein, in one embodiment, the surface of the crank comprises an outer side and an inner side, and the surface pattern is arranged on the outer side and / or the inner side.

[0013] Wherein, in one embodiment, the surface of the crank is provided with recesses of different sizes.

[0014] Wherein, in one embodiment, the recesses are part of a spherical surface, and the recesses are circular in shape.

[0015] Wherein, in one embodiment, the plurality of recesses include recesses that are elliptical in shape.

[0016] Wherein, in one embodiment, the length direction of the recesses that are elliptical in shape is aligned with the length direction of the crank.

[0017] Wherein, in one embodiment, the crank is made of carbon fiber composite material, the crank is hollow inside, and the hollow structure is formed by wind pressure.

[0018] The technical scheme provided by the utility model has the following technical effects:

[0019] 1. The utility model provides a bicycle crank, the surface of the crank is provided with a plurality of recesses, the plurality of recesses are arranged on the surface of the crank, forming a surface pattern, the plurality of recesses can reduce the surface wind resistance of the crank, reduce the riding resistance of the rider, can minimize energy loss, improve the riding speed and durability, thereby bringing better riding experience.

[0020] 2. The crank is made of carbon fiber composite material, which greatly reduces the weight of the crank, thereby reducing the burden of the rider and improving the acceleration performance and climbing efficiency. At the same time, the crank is hollow inside, which can further reduce the weight of the crank, and combined with the wind resistance reduction design of the surface recesses, it helps the bicycle to achieve faster speed and better performance. DRAWINGS

[0021] Figure 1 is a perspective view of the bicycle crank connected with the middle shaft according to an embodiment of the utility model;

[0022] Figure 2 is a full cross-sectional view of the crank according to the first embodiment of the utility model;

[0023] Figure 3 is a projection view of the crank in the A direction in the Figure 2

[0024] Figure 4 is a projection view of the crank in the B direction in the Figure 2

[0025] Figure 5 is a full cross-sectional view of the crank according to the second embodiment of the utility model;

[0026] Figure 6 is a projection view of the crank in the C direction in the Figure 5

[0027] Figure 7 is a projection view of the crank in the D direction in the Figure 5 DETAILED DESCRIPTION

[0028] To further illustrate the embodiments, the utility model provides the accompanying drawings. These accompanying drawings are part of the utility model disclosure, mainly used to illustrate the embodiments, and can be used to explain the operation principle of the embodiments in conjunction with the related description of the specification. With reference to these contents, those skilled in the art should understand other possible embodiments and the advantages of the utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0029] The utility model will be further illustrated in conjunction with the accompanying drawings and specific embodiments.

[0030] Embodiment 1

[0031] As shown in the Figures 1-4 , the embodiment provides a bicycle crank 1, two ends of the bicycle crank 1 are used for connecting the middle shaft 2 of the bicycle and the pedal (not shown). The bicycle crank 1 includes crank arm body 11, the first assembly hole 12 for connecting the middle shaft 2 is arranged on the crank arm body 11, and the second assembly hole 13 for connecting the pedal is arranged. The surface of the crank 1 is provided with a plurality of recesses 161, and the plurality of recesses 161 can reduce the surface wind resistance of the crank 1, and the principle is similar to the surface of the golf ball provided with recesses. The crank 1 provided with a plurality of recesses 161 can reduce the riding resistance of the rider, can minimize energy loss, improve riding speed and durability, so as to bring better riding experience.

[0032] ​​​​In this embodiment, a plurality of recesses 161 are arranged on the surface of the crank 1 to form a surface pattern 16. Furthermore, the plurality of recesses 161 are arranged in an array on the surface of the crank 1, which can achieve a better wind resistance reduction effect. For example, the plurality of recesses 161 are arranged according to a diamond grid. However, this is not a limitation; they can be arranged according to other grid shapes, such as circular, elliptical, or polygonal grids. Among these, arranging the plurality of recesses 161 according to a diamond grid can achieve a superior wind resistance reduction effect. In some embodiments, the surface pattern 16 is made into the surface pattern of a golf ball.

[0033] like Figures 1-4 As shown, in this embodiment, there are multiple recesses 161 arranged circumferentially along the first mounting hole 12 and the second mounting hole 13 to reduce the surface wind resistance around the mounting holes.

[0034] In this embodiment, the surface of the crank 1 includes an outer side 14 and an inner side 15, and a surface pattern 16 is provided on both the outer side 14 and the inner side 15 to achieve the best wind resistance reduction effect. Of course, in some embodiments, the surface pattern 16 may be provided only on one of the outer side 14 and the inner side 15.

[0035] In this embodiment, there are multiple recesses 161 of different sizes. These multiple recesses 161 of different sizes form a denser arrangement on the surface of the crank 1, resulting in a good wind resistance reduction effect.

[0036] like Figures 1-4 As shown, the concave surface of recess 161 is part of a sphere, and the shape of recess 161 is circular, thus improving the wind resistance reduction effect. However, it is not limited to this. In other embodiments, the concave surface of recess 161 can also be of other shapes, such as a polyhedral surface. The shape of recess 161 can also be polygonal, etc.

[0037] In this embodiment, the crank 1 is made of fiber composite material, more specifically, carbon fiber composite material. Carbon fiber composite material can greatly reduce the weight of the crank, thereby significantly reducing its own weight, thus reducing the burden on the rider and improving acceleration performance and climbing efficiency.

[0038] In this embodiment, the crank 1 has a hollow internal structure, which further reduces the weight of the crank. The hollow structure of the crank 1 can be formed by air pressure molding or similar methods.

[0039] Example 2

[0040] like Figures 5-7 As shown, in this embodiment, the shape of the recess is different from that in Embodiment 1, so the surface pattern 16a formed is different from that in Embodiment 1, but the rest is the same as in Embodiment 1.

[0041] In this embodiment, the surface of the crank 1a is provided with a plurality of recesses, including an elliptical recess 161a.

[0042] Further, the length direction of the elliptical recess 161a is aligned with the length direction of the crank 1a, so that the appearance is more beautiful and the wind resistance reduction effect is better.

[0043] In the utility model, through optimizing the surface shape and material and internal structure of the crank, air resistance is reduced to the maximum, energy loss during high-speed riding is reduced, and the racing bicycle is helped to achieve faster speed and better performance. The design of the crank not only improves the competitive level of professional athletes, but also allows ordinary cycling enthusiasts to enjoy more relaxed and efficient cycling fun.

[0044] Although the utility model is specifically shown and introduced in combination with the preferred embodiments, those skilled in the art should understand that various changes can be made to the utility model in form and detail without departing from the spirit and scope of the utility model defined in the appended claims, and all are within the protection scope of the utility model.

Claims

1. A bicycle crank, wherein the two ends of the crank are respectively used to connect the bicycle's bottom bracket and the pedals, characterized in that, The surface of the crank is provided with a plurality of recesses, which are arranged on the surface of the crank to form a surface pattern.

2. The bicycle crank according to claim 1, characterized in that: The plurality of said recesses are arranged in an array on the surface of the crank.

3. The bicycle crank according to claim 1, characterized in that: The plurality of said recesses are arranged according to a diamond grid; or, the surface pattern is made into the surface pattern of a golf ball.

4. The bicycle crank according to claim 1, characterized in that: The crank includes a crank arm body; the crank arm body is provided with a first mounting hole for connecting the bottom bracket and a second mounting hole for connecting the pedal; the surface of the crank has a plurality of recesses arranged circumferentially along the first mounting hole and / or the second mounting hole.

5. The bicycle crank according to claim 1, characterized in that: The surface of the crank includes an outer side and an inner side, and the surface pattern is provided on the outer side and / or the inner side.

6. The bicycle crank according to claim 1, characterized in that: The surface of the crank has recesses of different sizes.

7. The bicycle crank according to claim 1, characterized in that: The concave surface of the recess is part of a sphere, and the shape of the recess is circular.

8. The bicycle crank according to claim 1, characterized in that: The plurality of recesses include a recess with an elliptical shape.

9. The bicycle crank according to claim 1, characterized in that: The length direction of the elliptical recess is aligned with the length direction of the crank.

10. The bicycle crank according to claim 1, characterized in that: The crank is made of carbon fiber composite material, and the inside of the crank is a hollow structure formed by wind pressure molding.

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