Eccentric bicycle rim

Abstract

The utility model discloses an eccentric bicycle rim which comprises a rim body, a hub and spokes connecting the rim body and the hub, the hub comprises a shaft rod, a tower base, a first flange plate close to one side of the tower base and a second flange plate far away from one side of the tower base, and the rim body comprises an inner ring used for being connected with the spokes and an outer ring used for being connected with a tire. The spokes are connected between the first flange plate or the second flange plate and the inner ring, the diameter of the first flange plate is larger than that of the second flange plate, the first flange plate is close to the center of the shaft rod, the second flange plate is far away from the center of the shaft rod, and the number of the spokes on one side of the first flange plate is larger than that of the spokes on one side of the second flange plate. By adjusting the diameter of the flange plate and the offset of the eccentric wheel ring and optimizing the distribution of the number of the spokes on the two sides, the final tension balance effect is optimal, and the stability of the wheel under the action of transverse force is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheel sets and discloses an eccentric bicycle rim. Background Art

[0002] With the growing number of cycling enthusiasts, bicycle structure and performance have garnered significant attention. As a core component of a bicycle, the design and manufacture of the rim directly impacts the overall riding performance, comfort, and safety of the vehicle. Traditional bicycle rims typically feature a symmetrical design, with flanges on the freehub and non-freehub sides of similar size and an equal number of spokes. However, the presence of the freehub causes the distances from the flanges on both sides to the center of the hub to vary, leading to inconsistent spoke angles on both sides. This results in significantly higher spoke tension on the freehub side than on the non-freehub side. Over time, this tension imbalance can cause the spokes on the non-freehub side to loosen or even break, leading to rim deformation and impacting riding safety, driving efficiency, and lateral support stability.

[0003] Various existing methods exist to address this situation, but none completely resolve the tension imbalance caused by differences in flange position and size. Furthermore, most existing rim designs fail to account for the eccentricity of the spoke connection points, failing to fully optimize the tension distribution between the freehub and non-freehub sides. This limits the rim's overall rigidity and durability.

[0004] Therefore, how to design a structure that can effectively balance the spoke tension and improve the overall performance of the rim has become the focus of the industry. Utility Model Content

[0005] To solve the above problems, the present invention provides an eccentric bicycle rim. Through reasonable structural design, the overall performance of the bicycle rim is significantly improved, especially the uniformity of tension distribution and the durability of the rim. It solves many problems in the existing technology and has broad application prospects.

[0006] The technical solutions provided by this utility model are as follows:

[0007] An eccentric bicycle rim includes a rim, a hub, and spokes connecting the rim and the hub. The hub includes a shaft, a freehub, a first flange on a side close to the freehub, and a second flange on a side away from the freehub. The rim includes an inner ring for connecting to the spokes and an outer ring for connecting to a tire. The spokes are connected between the first flange or the second flange and the inner ring.

[0008] The diameter of the first flange is greater than the diameter of the second flange, the first flange is close to the center of the shaft, and the second flange is far from the center of the shaft;

[0009] The number of spokes on one side of the first flange is greater than the number of spokes on one side of the second flange;

[0010] The spoke connection point of the inner ring is offset toward the non-tower base relative to the geometric centerline of the rim.

[0011] In some embodiments, the ratio of the number of spokes on the first flange side to the number of spokes on the second flange side is 2:1.

[0012] In some embodiments, the number of spokes on one side of the first flange is 14, and the number of spokes on one side of the second flange is 7.

[0013] In some embodiments, a diameter ratio of the second flange to the first flange is 1:1.5 to 1:2.

[0014] In some embodiments, a ratio of distances between the first flange and the second flange and the center of the shaft is 1:2 to 1:3.

[0015] In some embodiments, the spoke connection point of the inner rim is offset by 2-3 mm toward the non-freewheel body side relative to the geometric centerline of the rim.

[0016] In summary, the beneficial effects of the present invention are as follows:

[0017] By adjusting the flange diameter and the offset of the eccentric rim, as well as optimizing the distribution of the number of spokes on both sides, this invention optimizes tension balance and ensures wheel stability under lateral forces. This solution can be used to address the problem of spoke tension differences on both sides of bicycle wheelsets with rim brakes and disc brakes.

[0018] Since the spoke tension is more uniform, the rim of the present invention exhibits stronger anti-torsion ability during high-speed riding, reduces the risk of rim deformation, and improves the stability and safety of the entire vehicle. It is particularly suitable for scenarios requiring high-intensity riding, such as mountain bikes and competitive bikes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the rim structure;

[0020] Figure 2 Schematic diagram of the cross-section structure of the rim;

[0021] Figure 3 This is a schematic diagram of the hub structure;

[0022] Figure 4 Schematic diagram of the rim structure.

[0023] The reference numerals are as follows:

[0024] 1. Rim; 2. Hub; 3. Spokes; 11. Inner ring; 12. Outer ring; 21. Axle; 22. Freehub; 23. First flange; 24. Second flange. DETAILED DESCRIPTION

[0025] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0026] A bicycle wheel is made up of spokes that form multiple triangular structures. The angle between the spokes and the center axis of the wheel, as well as the length of the spokes, determine the tension of a single spoke. When the added tension of the spokes on both sides is the same, the tension of the spokes on both sides is balanced.

[0027] Example 1

[0028] Please refer to Figure 1-4 This embodiment provides a bicycle rim comprising a rim 1, a hub 2, and spokes 3 connecting the rim and hub 2. The rim 1 includes an inner ring 11 and an outer ring 12. The inner ring 11 is used to connect the spokes 3, while the outer ring 12 is used to mount the bicycle tire. The hub 2 comprises a shaft 21, a freehub 22, a first flange 23, and a second flange 24. The first flange 23 is closer to the freehub 22 and has a larger diameter than the second flange 24. The second flange 24 is located on the other side of the hub 2, further away from the freehub 22.

[0029] To improve tension balance, the first flange 23 has a larger diameter than the second flange 24 and is positioned closer to the axle center. The spokes 3 on either side connect between the flanges and the inner ring 11. The inner ring 11 of the rim 1 is designed with an eccentric structure, with the spoke 3 connection points offset from the rim's geometric centerline toward the non-freewheeling base. This design creates a more optimal angle for the spokes 3 on the non-freewheeling base side, effectively extending the effective length of the spokes 3 on that side, reducing tension differences and improving overall structural strength.

[0030] By increasing the diameter of the flange on the side of the freehub 22, the angle of the spokes 3 on the side of the freehub 22 is increased, and the tension is distributed more evenly, effectively avoiding the deformation problem caused by uneven tension in traditional rims.

[0031] Furthermore, the second flange 24 on the side not containing the freehub 22 is shifted outward, further optimizing the spoke 3 angles on that side and effectively reducing tension differences. This outward-shifted flange also improves the rim's torsional resistance, adapting to the dynamic stress changes experienced during high-speed driving and ensuring wheel stability in varying road conditions.

[0032] The diameter ratio of the second flange 24 to the first flange 23 is 1:1.5 to 1:2, and the distance ratio of the first flange 23 to the second flange 24 from the center of the shaft 21 is 1:2 to 1:3.

[0033] The number of spokes 3 in the present invention adopts an asymmetric design. Specifically, the number of spokes 3 on the side of the tower base 22 is greater than that on the side not on the tower base 22. Preferably, the ratio of the number of spokes 3 on the side of the first flange 23 to the number of spokes 3 on the side of the second flange 24 is 2:1. This asymmetric design of the number of spokes 3 further balances the tension difference between the spokes 3 on both sides. The spokes 3 on the side of the tower base 22 are shorter and are subjected to relatively greater force. Therefore, increasing the number of spokes 3 can effectively reduce the tension borne by each spoke 3. The spokes 3 on the side not on the tower base 22 are longer and have relatively less tension. By reducing the number of spokes 3 on this side, the tension is balanced, thereby making the tension of the spokes 3 of the entire wheel more uniform, thereby improving the overall structural strength of the rim.

[0034] This embodiment utilizes an eccentric inner ring 11, with the spoke 3 connection points offset toward the non-freewheeling body side relative to the rim's geometric centerline. This design compensates for the tension differences caused by the flange on the freewheeling body 22 being closer to the axle center. This slight offset optimizes the length and angle of the spokes 3 on the freewheeling body side, resulting in more uniform tension and effectively balancing the tension differences between the freewheeling body 22 side and the non-freewheeling body side.

[0035] This eccentric design also improves the impact resistance of the entire wheel, allowing the rim to more evenly distribute the impact force when the bicycle is traveling at high speed or on bumpy roads, reducing the risk of permanent deformation of the rim due to excessive tension on one side, and increasing the durability of the wheel.

[0036] Example 2

[0037] The present invention also provides a method for balancing the tension of bicycle spokes 3, applicable to the rim of the above structure. The method aims to reduce or eliminate the unevenness of the tension of the spokes 3 through reasonable structural design, thereby improving the service life and safety performance of the rim.

[0038] First, the diameter of the first flange 23 on the freehub 22 side is increased, thereby increasing the effective length and angle of the spokes 3 on that side. Since the spokes 3 on the freehub 22 side are closer to the axle and have higher tension, this design effectively reduces the tension difference and achieves tension balance.

[0039] Next, adjust the flange position. Move the second flange 24 on the side not on the freehub outward a certain distance, thereby increasing the angle of the spokes 3 on that side and bringing them closer to the angle of the spokes 3 on the freehub 22 side. This method further evens out the tension distribution on both sides of the spokes 3, reducing the risk of spoke breakage due to uneven tension.

[0040] Furthermore, the eccentric design of the inner ring 11 also balances the tension of the spokes 3. By offsetting the spoke connection point of the inner ring 11 toward the non-freewheel body side relative to the geometric centerline, the tension difference caused by the flange being closer to the center on the freewheel body 22 side is compensated, ensuring balanced tension on the spokes 3 on both sides.

[0041] Finally, the optimized number of spokes 3 also contributes to tension balance. The freehub 22 side has more spokes 3 than the non-freehub 22 side. This asymmetric design ensures that the tension on each side of the spokes 3 is more evenly distributed, thereby improving the overall stability and torsional resistance of the rim.

[0042] Example 3

[0043] This embodiment further limits the parameters of the rim 1, spokes 3, and hub 2 on the basis of Embodiments 1 and 2. Specifically:

[0044] Flange design:

[0045] The diameter of the first flange 23 (on the side close to the tower base 22) is 74 mm, and the diameter of the second flange 24 (on the side away from the tower base 22) is 48 mm.

[0046] The distance between the first flange 23 and the center of the shaft 21 is 16 mm, and the distance between the second flange 24 and the center of the shaft 21 is 40 mm.

[0047] The diameter ratio of the first flange 23 to the second flange 24 is 1.54:1, and the distance ratio from the center of the shaft 21 is 1:2.5.

[0048] Number of spokes 3:

[0049] The number of spokes 3 on one side of the first flange 23 is 14, and the number of spokes 3 on the side of the second flange 24 is 7.

[0050] This 2:1 spoke ratio effectively balances tension on the freehub 22 side and the side not on the freehub 22. The freehub 22 side has a larger flange and more spokes 3, so this structural design distributes tension more evenly on both sides, reducing structural instability caused by tension differences.

[0051] The rim 1 has an eccentric design: the connection point of the spokes 3 on the inner ring 11 of the rim is offset by 2.6 mm towards the non-freewheel base relative to the geometric centerline of the rim.

[0052] This eccentric design compensates for the tension differences caused by the flange on the freehub body 22 being closer to the axle, ensuring more balanced tension on both sides of the spokes 3. This 2.6mm offset provides the proper balance during riding, distributing the tension on the spokes 3 more effectively in all directions.

[0053] Under this design, the tension of each of the 14 spokes 3 on the side of the tower base 22 is 1200N, and the tension of each of the 7 spokes 3 on the side not of the tower base 22 is 1180N.

[0054] The parameter design of this embodiment enables the bicycle rim to exhibit superior tension balance during high-speed riding. The larger diameter of the first flange 23, combined with the appropriate number of spokes 3 and optimized flange position, effectively manages the tension difference between the freehub 22 side and the non-freehub 22 side. This rim design is particularly suitable for mountain biking and long-distance cycling, significantly improving the durability and handling of the entire vehicle.

[0055] It should be noted that any implementations not shown or described in the drawings or the main text of the specification are known to those skilled in the art and are not described in detail. In addition, the above definitions of the various elements and methods are not limited to the various specific structures, shapes, or methods mentioned in the embodiments.

[0056] It should also be noted that while examples of parameters including specific values may be provided herein, these parameters do not need to be exactly equal to the corresponding values, but rather may approximate the corresponding values within acceptable error tolerances or design constraints. Directional terms mentioned in the embodiments, such as "upper," "lower," "front," "back," "left," "right," "inner," and "outer," are merely references to the directions in the accompanying drawings and are not intended to limit the scope of protection of this application.

[0057] The foregoing description shows and describes preferred embodiments of the present invention. As previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention as taught herein or through the techniques or knowledge of the relevant art. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. An eccentric bicycle rim, characterized in that: The wheel comprises a rim, a hub, and spokes connecting the rim and the hub, wherein the hub comprises an axle, a freehub, a first flange close to the freehub, and a second flange away from the freehub, the rim comprises an inner ring for connecting the spokes and an outer ring for connecting to a tire, and the spokes are connected between the first flange or the second flange and the inner ring; The diameter of the first flange is greater than the diameter of the second flange, the first flange is close to the center of the shaft, and the second flange is far from the center of the shaft; The number of spokes on one side of the first flange is greater than the number of spokes on one side of the second flange; The spoke connection point of the inner ring is offset toward the non-tower base side relative to the geometric center line of the rim.

2. The eccentric bicycle rim according to claim 1, characterized in that: The ratio of the number of spokes on one side of the first flange to the number of spokes on one side of the second flange is 2:

1.

3. The eccentric bicycle rim according to claim 2, characterized in that: The number of spokes on one side of the first flange is 14, and the number of spokes on one side of the second flange is 7.

4. The eccentric bicycle rim according to claim 1, characterized in that: A diameter ratio of the second flange to the first flange is 1:1.5 to 1:

2.

5. The eccentric bicycle rim according to claim 1, characterized in that: The ratio of the distances between the first flange and the second flange and the center of the shaft is 1:2 to 1:

3.

6. The eccentric bicycle rim according to claim 1, characterized in that: The spoke connection point of the inner ring is offset by 2-3 mm toward the non-tower base side relative to the geometric center line of the rim.

Images