Spoke mounting structure for increasing spoke driving radius and bicycle rim assembly

Abstract

The utility model provides a spoke installation structure for increasing spoke driving radius and a bicycle rim assembly, comprising: a first spoke disc, the outer side wall of which is provided with a plurality of spoke installation grooves in an equidistant annular array, the opening direction of the spoke installation grooves being perpendicular to the axis direction of the first spoke disc, and the opening direction of the spoke installation grooves being perpendicular to the axis direction of the first spoke disc; each spoke mounting groove comprises a first containing groove and second containing grooves formed in the two sides of the first containing groove, and a first placing groove is formed in the bottom of each second containing groove; each first spoke comprises a spoke rod part and a bent part connected with the spoke rod part, and the end, away from the spoke rod part, of each bent part is provided with a limiting protruding block corresponding to the corresponding first containing groove; the limiting protruding block can move into the first containing groove in the direction of the second containing groove after penetrating through the first containing groove, so that the other end of the spoke rod part is installed on the inner ring of the rim, the driving radius of the first spoke can be effectively increased, the tension of the spoke is reduced, and the driving efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a spoke mounting structure for increasing the spoke driving radius and a bicycle wheel rim assembly, which are applied to the bicycle field. Background Art

[0002] The spoke mounting structure of a bicycle wheel is the part that connects the rim to the hub. It includes the spokes, rim, and hub. The purpose of this structure is to firmly fix the rim to the hub while allowing the rim to withstand various forces during riding, such as rotational force, impact force, and lateral force.

[0003] The current carbon spoke installation structure is a composite spoke structure such as the one in the announcement number TWM495307U. Figure 1 The patent discloses that by setting the bent spokes on the side wall of the spoke disc, the purpose of facilitating the replacement of the spokes can be achieved. However, the driving radius of the bicycle spokes is small. The driving radius of the bicycle spokes refers to the vertical distance from the spoke to the center of the bicycle hub. Since the pedaling output torque of the bicycle is constant, the driving torque distributed to each spoke is constant. According to the formula between torque and force: T = F × r, it can be seen that when the driving radius is larger, the spoke tension F is smaller. Figure 2 From the force analysis, it can be seen that the spoke tension F is decomposed into the centripetal force F2 from the rim to the center of the hub and the driving force F1 in the tangential direction of the rim's outer periphery. If the vertical distance R1 between the spoke and the center of the bicycle rim is larger, the angle α between the tension F and the centripetal force F2 is larger, the centripetal force F2 is smaller, and the driving force F1 in the tangential direction of the rim's outer periphery is larger. Therefore, increasing the driving radius of the spoke can not only reduce the spoke tension F and improve the durability of the spoke, but also increase the proportion of the driving force F2 in the tangential direction of the rim's outer periphery and improve the driving efficiency. Therefore, based on the above analysis, the utility model designs a spoke mounting structure and a bicycle rim assembly that increase the spoke driving radius. Utility Model Content

[0004] The utility model provides a spoke mounting structure and a bicycle wheel rim assembly for increasing the spoke driving radius, which can effectively solve the above problems.

[0005] The utility model is achieved in this way:

[0006] A spoke mounting structure for increasing the spoke driving radius, comprising:

[0007] A first spoke disk, having a plurality of spoke mounting grooves in an equidistant annular array provided on its outer side wall, wherein the opening direction of the spoke mounting grooves is perpendicular to the axis direction of the first spoke disk, the spoke mounting grooves comprising a first receiving groove and second receiving grooves provided on both sides of the first receiving groove, and a first placement groove provided at the bottom of the second receiving groove;

[0008] A plurality of first spokes mounted on the first spoke disc include a spoke stem portion and a bent portion connected to the spoke stem portion, wherein the bent portion is provided with a limiting protrusion corresponding to the first placement groove at one end away from the spoke stem portion, and the limiting protrusion can move into the first placement groove along the direction of the second placement groove after passing through the first accommodation groove, so that the other end of the spoke stem portion is mounted on the inner ring of the rim.

[0009] As a further improvement, the second accommodating grooves at both ends of the first accommodating groove are staggered along the axial direction of the first spoke disc, so that the first spokes installed on the second accommodating grooves close to the adjacent spoke installation grooves are cross-arranged on the inner ring of the rim.

[0010] As a further improvement, the number of the spoke mounting grooves is N, and the number of the first spokes is 2N, where N=5-10.

[0011] As a further improvement, the side wall of the first spoke disc is provided with a plurality of first hollow grooves corresponding to the spoke mounting grooves.

[0012] A bicycle rim assembly, comprising:

[0013] It includes a hub and a rim, and a spoke unit connecting the hub and the rim;

[0014] The spoke unit includes a spoke mounting structure for increasing the spoke driving radius, and the second spoke disc arranged on the other side of the hub, a plurality of second spokes are mounted on the second spoke disc, and the other end of the second spoke is mounted on the rim.

[0015] As a further improvement, several protrusions are provided on the outer side wall of the second spoke disk, a third accommodating groove is provided on the side wall at one end of the protrusion, a second placement groove is provided at the bottom of the third accommodating groove, and a second hollow groove corresponding to the third accommodating groove is provided on the side wall of the second spoke disk.

[0016] As a further improvement, the second spoke includes a straight rod portion and a limiting protrusion connected to the straight rod portion. The limiting protrusion of the second spoke moves from the second hollow groove along the direction of the third accommodating groove to the second placement groove, and then the other end of the second spoke is installed on the inner ring of the rim.

[0017] As a further improvement, the number of the protrusions and the number of the spoke mounting grooves are both N.

[0018] As a further improvement, the inner ring of the rim is composed of an annular array of arc-shaped units consisting of a recessed portion and a raised portion, the second spoke is arranged at the recessed portion away from one end of the second spoke disk, and the second spoke is arranged on the inner ring of the rim on both sides of the second spoke away from one end of the first spoke disk.

[0019] As a further improvement, the first spoke and the second spoke are fixed to the inner ring of the wheel rim by bolt mounting members.

[0020] The beneficial effects of the present invention are as follows: through the spoke mounting groove arranged on the first spoke disk, the spoke mounting groove includes a first receiving groove and second receiving grooves arranged on both sides of the first receiving groove, the bottom of the second receiving groove is provided with a first placement groove whose opening is larger than the second receiving groove, the limiting protrusion of the first spoke first passes through the first receiving groove, moves into the first placement groove along the direction of the second receiving groove, and then the other end of the first spoke is installed on the inner ring of the rim, which can make the driving radius of the first spoke greater than the radius of the first spoke disk, effectively increase the driving radius of the first spoke, reduce the tension of the first spoke, improve the durability of the first spoke, and increase the proportion of the driving force of the spoke to the tangential direction of the outer periphery of the rim, thereby improving the driving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a structural diagram of a composite spoke structure with announcement number TWM495307U.

[0023] Figure 2 This is a schematic diagram of the force analysis of the composite spoke structure with announcement number TWM495307U.

[0024] Figure 3 It is a structural diagram provided by an embodiment of the present utility model.

[0025] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0026] Figure 5 It is a structural diagram provided by an embodiment of the present utility model.

[0027] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure at point B in the middle.

[0028] Figure 7 It is a structural diagram provided by an embodiment of the present utility model.

[0029] Figure 8 yes Figure 7Schematic diagram of the enlarged structure at point C in the middle.

[0030] Figure 9 This is a schematic diagram of the structure of the first spoke and the second spoke provided in an embodiment of the present utility model.

[0031] Figure 10 It is a schematic diagram of force analysis provided by an embodiment of the present utility model.

[0032] The accompanying drawings are identified as follows:

[0033] 10. Flower drum;

[0034] 20. Spoke unit; 21. First spoke disc; 211. Spoke mounting groove; 212. First receiving groove; 213. Second receiving groove; 214. First placement groove; 215. First hollow groove; 22. Second spoke disc; 221. Protrusion; 222. Third receiving groove; 223. Second placement groove; 224. Second hollow groove; 23. First spoke; 231. Spoke rod; 232. Bend; 24. Second spoke; 241. Straight rod; 25. Position-limiting protrusion;

[0035] 30. Wheel rim; 31. Concave portion; 32. Raised portion; 33. Bolt mounting member. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is claimed, but merely represents selected embodiments of the present invention.

[0037] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically specified.

[0038] Reference Figures 3 to 8As shown, a bicycle wheel rim assembly includes a hub 10 and a rim 30, and a spoke unit 20 connecting the hub 10 and the rim 30. The spoke unit 20 includes a spoke mounting structure for increasing the spoke driving radius and a second spoke disc 22 mounted on the other side of the hub 10. A plurality of second spokes 24 are mounted on the second spoke disc 22. The other ends of the first spokes 23 and the second spokes 24 are mounted on the rim 30. The spoke mounting structure includes a first spoke disc 21 provided on the hub 10. The first spoke disc 21 is mounted on the plurality of first spokes 23.

[0039] Reference Figures 3 to 6 As shown, a plurality of spoke mounting grooves 211 in an equidistant annular array are provided on the outer wall of the first spoke disk 21. The opening direction of the spoke mounting groove 211 is perpendicular to the axial direction of the first spoke disk 21. The spoke mounting groove 211 includes a first receiving groove 212 and a second receiving groove 213 provided on both sides of the first receiving groove 212. The opening of the first receiving groove 212 is larger than the second receiving groove 213. The bottom of the second receiving groove 213 is provided with an opening larger than the second receiving groove 213. The first placement groove 214, the first spoke 23 includes a spoke rod 231 and a bent portion 232 connected to the spoke rod 231, and the bent portion 232 is provided with a limiting protrusion 25 corresponding to the first placement groove 214 at one end away from the spoke rod 231. The limiting protrusion 25 of the first spoke 23 first passes through the first receiving groove 212 and moves along the direction of the second receiving groove 213 to the first placement groove 214, and then the other end of the first spoke 23 is installed on the inner ring of the rim 30. Figure 10 As shown, the first spoke 23 of this embodiment is provided with a bent portion 232, and the first spoke is installed on the outer side wall of the first spoke disk 21. Therefore, the driving radius R2 of the first spoke 23 is greater than the radius r1 of the first spoke disk 21. Compared with the driving radius R1 of the spoke in the comparative example, which is smaller than the radius r1 of the spoke disk, the driving radius R2 in this embodiment is greater than R1. According to the constant pedaling output torque of the bicycle, the driving torque evenly distributed to each spoke is constant. According to the formula between torque and force: T=F×r, it can be seen that T is the torque, F is the spoke tension, and r is the driving radius of the spoke. The larger the driving radius, the smaller the required spoke tension F. Since the driving radius R2 increases, the angle between the tension of the first spoke 23 and the centripetal force F2 of the first spoke 23 to the center of the rim increases, the centripetal force F2 decreases, and the driving force F1 in the tangential direction of the outer periphery of the rim increases. This shows that the spoke mounting structure in this embodiment effectively increases the driving radius of the first spoke 23, can reduce the tension of the first spoke 23, improve the service life of the first spoke 23, and can increase the ratio of the driving force of the first spoke 23 to the tangential direction of the outer periphery of the rim 30, thereby improving the driving efficiency.

[0040] Reference Figures 3 to 6 As shown, the second receiving grooves 213 at both ends of the first receiving groove 212 are staggered along the axis of the first spoke disc 21, so that the first spokes 23 installed in the second receiving grooves 213 adjacent to the adjacent spoke installation grooves 211 are cross-arranged on the inner ring of the rim 30. This results in a circle of cross-arranged spokes on the rim 30, and this spoke weaving method makes the spoke installation more secure.

[0041] Reference Figures 3 to 6 As shown, the side wall of the first spoke disk 21 is provided with a plurality of first hollow grooves 215 corresponding to the spoke mounting grooves 211. The purpose of providing the first hollow grooves 215 is to reduce the weight of the first spoke disk 21, save materials, and save manufacturing costs on the one hand, and to facilitate the installation of the first spokes 23 on the other hand.

[0042] Reference Figures 7-8 As shown, a plurality of protrusions 221 are provided on the outer wall of the second spoke disk 22. A third receiving groove 222 is provided on the side wall at one end of the protrusion 221. A second placement groove 223 is provided at the bottom of the third receiving groove 222. A second hollow groove 224 corresponding to the third receiving groove 222 is provided on the side wall of the second spoke disk 22. The second spoke 24 includes a straight rod portion 241 and a limiting protrusion 25 connected to the straight rod portion 241. The limiting protrusion 25 of the second spoke 24 moves from the second hollow groove 224 along the direction of the third receiving groove 222 to the second placement groove 223, and then the other end of the second spoke 24 is installed on the inner ring of the rim 30. This structural arrangement facilitates the installation of the second spoke 24 on the second spoke disk 22.

[0043] Reference Figure 3 As shown, the number of the spoke mounting grooves 211 is N, and the number of the first spokes 23 is 2N, where N=5~10. In the present embodiment, N=7, the number of the spoke mounting grooves is 7, and the number of the first spokes 23 is 14. The number of the protrusions 221 and the number of the spoke mounting grooves 211 are both N. In the present embodiment, the number of the protrusions 221 and the number of the spoke mounting grooves 211 are also 7. Providing 7 groups of spoke mounting structures can increase the stability of the bicycle rim and effectively control the manufacturing cost.

[0044] Reference Figures 3 to 8As shown, the inner ring of the rim 30 is formed by an annular array of arc-shaped units consisting of a recessed portion 31 and a raised portion 32. The second spoke 24 is disposed in the recessed portion 31 at the end away from the second spoke disc 22. The second spoke 24 is disposed on the inner ring of the rim 30 at the end away from the first spoke disc 21, on either side of the second spoke 24. The first spoke 23 and the second spoke 24 are secured to the inner ring of the rim 30 via bolt mounting members 33. This arrangement effectively balances the tension of the first spoke 23 and the second spoke 25, and increases the structural stability of the recessed portion 31.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A spoke mounting structure for increasing the spoke driving radius, characterized in that: include: A first spoke disc (21) is provided with a plurality of spoke mounting grooves (211) in an equidistant annular array on its outer side wall, the opening direction of the spoke mounting grooves (211) being perpendicular to the axis direction of the first spoke disc (21), the spoke mounting grooves (211) comprising a first receiving groove (212) and second receiving grooves (213) provided on both sides of the first receiving groove (212), and a first placement groove (214) being provided at the bottom of the second receiving groove (213); A plurality of first spokes (23) mounted on a first spoke disc (21) include a spoke stem portion (231) and a bent portion (232) connected to the spoke stem portion (231); one end of the bent portion (232) away from the spoke stem portion (231) is provided with a limiting protrusion (25) corresponding to the first placement groove (214); the limiting protrusion (25) can move into the first placement groove (214) along the direction of the second placement groove (213) after passing through the first accommodation groove (212), so that the other end of the spoke stem portion (231) is mounted on the inner ring of the wheel rim (30).

2. A spoke mounting structure for increasing spoke driving radius according to claim 1, characterized in that: The second accommodating grooves (213) at both ends of the first accommodating groove (212) are staggered along the axial direction of the first spoke disc (21), so that the first spokes (23) installed on the second accommodating grooves (213) adjacent to the adjacent spoke installation grooves (211) are cross-arranged on the inner ring of the wheel rim (30).

3. A spoke mounting structure for increasing spoke driving radius according to claim 2, characterized in that: The number of the spoke mounting grooves (211) is N, and the number of the first spokes (23) is 2N, where N=5-10.

4. A spoke mounting structure for increasing spoke driving radius according to claim 3, characterized in that: The side wall of the first spoke disk (21) is provided with a plurality of first hollow grooves (215) corresponding to the spoke mounting grooves (211).

5. A bicycle rim assembly, characterized in that: include: It comprises a hub (10) and a rim (30), and a spoke unit (20) connecting the hub (10) and the rim (30); The spoke unit (20) includes a spoke mounting structure for increasing the spoke driving radius as described in any one of claims 1 to 4, and the second spoke disc (22) arranged on the other side of the hub (10), wherein a plurality of second spokes (24) are mounted on the second spoke disc (22), and the other end of the second spoke (24) is mounted on the rim (30).

6. The bicycle rim assembly according to claim 5, wherein: A plurality of protrusions (221) are provided on the outer side wall of the second spoke disc (22); a third receiving groove (222) is provided on the side wall at one end of the protrusion (221); a second placement groove (223) is provided at the bottom of the third receiving groove (222); and a second hollow groove (224) corresponding to the third receiving groove (222) is provided on the side wall of the second spoke disc (22).

7. The bicycle rim assembly according to claim 6, wherein: The second spoke (24) includes a straight rod portion (241) and a limiting protrusion (25) connected to the straight rod portion (241). The limiting protrusion (25) of the second spoke (24) moves from the second hollow groove (224) along the direction of the third receiving groove (222) to the second placement groove (223), and then the other end of the second spoke (24) is installed on the inner ring of the wheel rim (30).

8. The bicycle rim assembly according to claim 7, wherein: The number of the protrusions (221) and the number of the spoke mounting grooves (211) are both N.

9. The bicycle rim assembly according to claim 8, wherein: The inner ring of the wheel rim (30) is formed by an annular array of arc-shaped units consisting of a concave portion (31) and a convex portion (32); the second spoke (24) is arranged at the concave portion (31) at one end away from the second spoke disk (22); and the second spoke (24) is arranged on the inner ring of the wheel rim (30) at both sides of the second spoke (24) at one end away from the first spoke disk (21).

10. The bicycle rim assembly according to claim 9, wherein: The first spoke (23) and the second spoke (24) are fixed to the inner ring of the wheel rim (30) via bolt mounting members (33).

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