Bicycle rim and spoke tension balancing method thereof

Abstract

The invention discloses a bicycle rim and a spoke tension balancing method thereof.The bicycle rim comprises a rim body, a hub and spokes connecting the rim body and the hub, and the hub comprises a shaft rod, a tower footing, a first flange plate close to one side of the tower footing and a second flange plate away from one side of the tower footing; the rim comprises an inner ring used for being connected with 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, and the second flange plate is far away from the center of the shaft rod. 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, and the spoke connecting points of the inner ring deviate towards the non-tower footing side relative to the geometric center line of the rim. And the stability of the wheel under the action of transverse force is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of wheel sets and discloses a bicycle rim and a spoke tension balancing method thereof. Background Art

[0002] With the continuous increase in cycling and cycling enthusiasts, the structure and performance of bicycles have received great attention. As one of the core components of bicycles, the design and manufacturing of the rim directly affects the riding performance, comfort and safety of the entire vehicle. Traditional bicycle rims usually adopt a symmetrical design, that is, the flanges on the freehub side and the non-freehub side are of similar size and have the same number of spokes. However, due to the existence of the freehub, the distances from the flanges on both sides to the center of the hub cannot be consistent, and the spoke angles on both sides cannot be the same, resulting in the spoke tension on the freehub side being significantly higher than that on the non-freehub side. Over time, this tension imbalance will cause the spokes on the non-freehub side to loosen or even break, and the rim to deform, which in turn affects riding safety, driving efficiency, and lateral support stability.

[0003] In order to improve this situation, there are various improvement methods in the prior art, but they cannot completely solve the tension imbalance problem caused by the difference in flange position and size. In addition, most existing rim designs do not consider the eccentricity of the spoke connection point, and fail to fully optimize the tension distribution on the freehub side and the non-freehub side, resulting in the overall rigidity and durability of the rim being limited.

[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. Summary of the invention

[0005] To solve the above problems, the present invention provides a bicycle rim and a method for balancing the tension of its spokes. Through reasonable structural design, the overall performance of the bicycle rim, especially the uniformity of tension distribution and the durability of the rim, is significantly improved, many problems in the prior art are solved, and the method has broad application prospects.

[0006] The technical solution provided by the present invention is as follows:

[0007] On the one hand, a bicycle rim includes a wheel rim, a hub, and spokes connecting the wheel rim and the hub, wherein the hub includes an axle, a freehub, a first flange on a side close to the freehub, and a second flange on a side away from the freehub, the wheel rim includes an inner ring for connecting the spokes, and an outer ring for connecting a tire, and 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 distance ratio 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 ring is offset by 2-3 mm toward the non-freewheel base side relative to the geometric center line of the rim.

[0016] On the other hand, a bicycle rim spoke tension balancing method is applied to the above-mentioned bicycle rim, characterized by comprising:

[0017] The diameter of the hub flange increases the effective length and angle of the spokes on that side by increasing the diameter of the first flange on the freehub base side, thereby balancing the tension of the spokes on both sides.

[0018] Flange position: Move the second flange on the non-freewheel base side outward to balance the spoke angle and tension.

[0019] The eccentric rim makes the spoke connection point of the inner ring offset to the non-freewheel base side relative to the geometric centerline of the rim to compensate for the tension difference caused by the flange position on the freewheel base side being close to the center, ensuring that the spoke tension on the freewheel base side and the non-freewheel base side is balanced.

[0020] The number of spokes on the freehub side and the non-freehub side is asymmetric, with the number of spokes on the freehub side being greater than the number of spokes on the non-freehub side.

[0021] In some embodiments, the ratio of the number of freehub-side spokes to the number of non-freehub-side spokes is 2:1.

[0022] In some embodiments, a diameter ratio of the second flange to the first flange is 1:1.5 to 1:2.

[0023] In some embodiments, a distance ratio between the first flange and the second flange and the center of the shaft is 1:2 to 1:3.

[0024] In summary, the beneficial effects of the present invention are as follows:

[0025] The present invention adjusts the flange diameter and the offset of the eccentric wheel rim, and optimizes the distribution of the number of spokes on both sides, so as to achieve the best tension balance effect and ensure the stability of the wheel under the action of lateral force. The problem of spoke tension difference on both sides can be solved according to the solution of the present application for both rim brake and disc brake wheels.

[0026] Since the spoke tension is more uniform, the rim of the present invention exhibits stronger torsion resistance 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 bicycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the rim structure; Figure 2 It is a schematic diagram of the cross-section structure of the rim; Figure 3 This is a schematic diagram of the hub structure; Figure 4 Schematic diagram of the rim structure.

[0032] The reference numerals are as follows:

[0033] 1. Rim; 2. Hub; 3. Spokes; 11. Inner ring; 12. Outer ring; 21. Axle; 22. Freewheel base; 23. First flange; 24. Second flange. DETAILED DESCRIPTION

[0034] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0035] A bicycle wheel is formed of multiple triangular structures by spokes. The angle between the spoke and the center axis of the wheel, as well as the length of the spoke, determines 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.

[0036] Example 1

[0037] Please refer to Figure 1-4 The present embodiment provides a bicycle rim, which is composed of a rim 1, a hub 2, and spokes 3 connecting the two. The rim 1 includes an inner ring 11 and an outer ring 12, the inner ring 11 is used to connect the spokes 3, and the outer ring 12 is used to install the bicycle tire. The hub 2 is composed of a shaft 21, a freewheel base 22, a first flange 23, and a second flange 24. The first flange 23 is close to one side of the freewheel base 22 and has a diameter larger than the second flange 24; the second flange 24 is located on the other side of the hub 2, away from the freewheel base 22.

[0038] In order to improve the tension balance, the diameter of the first flange 23 is larger than that of the second flange 24, close to the center of the axle, and the spokes 3 on both sides are connected between the flange and the inner ring 11. The inner ring 11 of the rim 1 is designed as an eccentric structure, and the connection point of the spoke 3 is offset to the non-freewheel base side relative to the geometric center line of the rim. Through this design, the angle of the non-freewheel base side spoke 3 is more reasonable, which effectively extends the effective length of the side spoke 3, reduces the tension difference, and improves the strength of the overall structure.

[0039] 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 distribution is more even, which effectively avoids the deformation problem caused by uneven tension in traditional rims.

[0040] In addition, the position of the second flange 24 on the non-freewheel base 22 side is moved outward, which further optimizes the angle of the spoke 3 on this side and effectively reduces the tension difference. At the same time, the outward-moving flange design also improves the torsion resistance of the rim, adapts to the dynamic stress changes of the wheel during high-speed driving, and ensures the stability of the wheel under different road conditions.

[0041] 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.

[0042] The number of spokes 3 is designed asymmetrically in the present invention. 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 of 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 on each spoke 3. The spokes 3 on the side not on the tower base 22 are longer and have relatively less tension. The tension is balanced by reducing the number of spokes 3 on this side, thereby making the tension of the spokes 3 of the entire wheel more uniform and improving the overall structural strength of the rim.

[0043] This embodiment adopts an eccentric inner ring 11 design, and the connection point of the spokes 3 of the inner ring 11 is offset to the non-freewheeling side relative to the geometric center line of the rim. This design is to compensate for the tension difference caused by the flange position on the freewheeling side 22 being closer to the center of the axle. Through this small offset design, the length and angle of the spokes 3 on the freewheeling side are optimized, making its tension more uniform, and effectively balancing the tension difference between the freewheeling side 22 and the non-freewheeling side.

[0044] This eccentric design also improves the impact resistance of the entire wheel, allowing the rim to more evenly disperse 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.

[0045] Example 2

[0046] The present invention also provides a method for balancing the tension of bicycle spokes 3, which is 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.

[0047] First, the diameter of the first flange 23 on the freehub 22 side is increased to increase the effective length and angle of the spokes 3 on this side. Since the spokes 3 on the freehub 22 side are closer to the axle and originally have a larger tension, this design can effectively reduce the tension difference and achieve tension balance.

[0048] Secondly, adjust the position of the flange. The second flange 24 on the non-tower base side is moved outward for a distance, thereby increasing the angle of the spoke 3 on this side and making it closer to the angle of the spoke 3 on the tower base 22 side. In this way, the tension distribution of the spokes 3 on both sides can be further balanced, reducing the risk of the spokes 3 breaking due to uneven tension.

[0049] In addition, the eccentric design of the inner ring 11 also balances the tension of the spokes 3. By shifting the spoke 3 connection point of the inner ring 11 toward the non-tower base side relative to the geometric center line, the tension difference caused by the flange position on the tower base 22 side being close to the center is compensated, ensuring that the tension of the spokes 3 on the tower base 22 side and the non-tower base 22 side is balanced.

[0050] Finally, the optimized design of the number of spokes 3 also helps balance the tension. The number of spokes 3 on the freehub 22 side is greater than that on the non-freehub 22 side. This asymmetric design ensures that the tension borne by the spokes 3 on each side is closer, thereby improving the overall stability and torsional resistance of the rim.

[0051] Example 3

[0052] This embodiment further limits the parameters of the rim 1, the spokes 3 and the hub 2 on the basis of the embodiments 1 and 2. Specifically:

[0053] Flange design:

[0054] The diameter of the first flange 23 (the side close to the tower base 22) is 74 mm, and the diameter of the second flange 24 (the side away from the tower base 22) is 48 mm.

[0055] 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.

[0056] 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.

[0057] - Spoke 3 quantity:

[0058] The number of spokes 3 on one side of the first flange 23 is 14, and the number of spokes 3 on one side of the second flange 24 is 7.

[0059] This 2:1 ratio of spokes can effectively balance the tension on the freehub 22 side and the non-freehub 22 side. The flange on the freehub 22 side is larger and has more spokes 3. Therefore, through this structural design, the tension of the spokes 3 on both sides is more evenly distributed, reducing structural instability caused by tension differences.

[0060] The rim 1 has an eccentric design: the spoke 3 connection point of the inner ring 11 of the rim is offset by 2.6 mm to the non-tower base side relative to the geometric center line of the rim.

[0061] This eccentric design is to compensate for the tension difference caused by the flange position on the side of the freehub 22 being close to the axle center, so that the tension of the spokes 3 on both sides is more balanced. The 2.6mm offset can provide a proper balance during riding, making the distribution of the tension of the spokes 3 in all directions more reasonable.

[0062] 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 on the tower base 22 is 1180N.

[0063] The parameter design of this embodiment allows the bicycle rim to exhibit a more excellent tension balance capability during high-speed riding. The larger diameter of the first flange 23, combined with the reasonable number of spokes 3 and the optimization of the flange position, effectively controls the tension difference between the freehub 22 side and the non-freehub 22 side. This rim design is particularly suitable for mountain bikes and long-distance riding, and can significantly improve the durability and handling of the entire vehicle.

[0064] It should be noted that the implementation methods not shown or described in the drawings or the text of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments.

[0065] It should also be noted that this document may provide demonstrations of parameters containing specific values, but these parameters do not need to be exactly equal to the corresponding values, but can be approximated to the corresponding values ​​within an acceptable error tolerance or design constraint. Directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", etc., are only referenced to the directions of the drawings and are not intended to limit the scope of protection of this application.

[0066] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A 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, wherein the wheel comprises an inner ring for connecting the spokes and an outer ring for connecting a tire, wherein 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 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 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 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 bicycle rim according to claim 1, characterized in that: The distance ratio between the first flange and the second flange and the center of the shaft is 1:2 to 1:

3.

6. The 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.

7. A bicycle rim spoke tension balancing method, applied to the bicycle rim according to any one of claims 1 to 5, characterized in that: include: The diameter of the hub flange increases the effective length and angle of the spokes on that side by increasing the diameter of the first flange on the freehub base side, thereby balancing the tension of the spokes on both sides. Flange position: Move the second flange on the non-freewheel base side outward to balance the spoke angle and tension. The eccentric rim makes the spoke connection point of the inner ring offset to the non-freewheel base side relative to the geometric centerline of the rim to compensate for the tension difference caused by the flange position on the freewheel base side being close to the center, ensuring that the spoke tension on the freewheel base side and the non-freewheel base side is balanced. The number of spokes on the freehub side and the non-freehub side is asymmetric, with the number of spokes on the freehub side being greater than the number of spokes on the non-freehub side.

8. The bicycle rim spoke tension balancing method according to claim 7, characterized in that: The ratio of the number of spokes on the freehub side to the number of spokes on the non-freehub side is 2:

1.

9. The bicycle spoke tension balancing method according to claim 7, characterized in that: The diameter ratio of the second flange to the first flange is 1:1.5 to 1:

2.

10. The bicycle spoke tension balancing method according to claim 7, characterized in that: The distance ratio between the first flange and the second flange and the center of the shaft is 1:2 to 1:3.

Images