Torsional hub shell

Abstract

The utility model discloses a torsion hub shell which comprises a hollow hub shell body, and two flanges used for being connected with spokes are arranged on the surface of the hub shell body. The hub shell is composed of a first shell, a second shell and a third shell, the second shell and the third shell are arranged on the two sides of the first shell, the first shell is provided with a twisted structure formed by twisting in the axial direction, and the inner side of the second shell is provided with a gear ring used for being coupled with a tower footing. The twisted structure comprises a plurality of supporting faces and reinforcing ribs among the supporting faces, and the reinforcing ribs extend in the riding direction and are used for enhancing the strength of the shell. The first flange and the second flange are arranged on the outer surfaces of the second shell and the first shell correspondingly and used for achieving spoke connection. The hub shell is novel in structure, has excellent strength and stability, and is particularly suitable for being applied to a high-performance bicycle wheel set.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of hub, disclose a kind of twist hub shell. BACKGROUND

[0002] With the popularity of bicycle sports and the development of whole vehicle light weight trend, as the important core component connecting frame and wheel group, the optimization of its structural performance and manufacturing process becomes the hotspot of current technical research and development. The traditional hub shell is usually made of aluminum alloy material, and is formed by numerical control turning, milling and other machining methods. Although it can meet the basic strength requirements, it has the disadvantages of heavy weight, long processing cycle and limited design shape. In the field of high-end sports bicycles, especially in road racing or mountain cross applications, cyclists increasingly demand whole vehicle weight, structural strength, impact resistance and fatigue resistance. The manufacturing method and structural design of traditional hub have been difficult to meet the professional needs of this type of users.

[0003] In addition, the existing hub shell is usually designed as a straight cylinder or a symmetrical structure, lacking the ability to guide and adjust spoke tension distribution. In an asymmetric wheel group structure (such as a rear wheel with a large difference in tension between the tower side and the non-tower side), it is difficult for the traditional hub shell to achieve balanced tension adjustment, thereby affecting the overall stability and service life of the wheel group. At the same time, it is difficult for the traditional hub structure to balance light weight and strength, resulting in the need to sacrifice part of the reliability while pursuing weight reduction.

[0004] Therefore, it is urgent to provide a novel hub shell with convenient manufacturing and excellent performance to meet the multiple needs of new generation high-performance bicycles for hub light weight, personalization and functionality. SUMMARY

[0005] To solve the above problems, the utility model provides a kind of twist hub shell, adopt axial torsion structure, on the basis of guaranteeing structural strength, can optimize the stress distribution of spoke, improve the overall torsional performance and riding stability of wheel group.

[0006] The technical scheme provided by the utility model is as follows:

[0007] A twist hub shell includes an internally hollow hub shell, two outwardly extending flanges are provided on the surface of the hub shell, and the flanges are used to connect spokes;

[0008] The hub shell includes a first shell body, and a second shell body and a third shell body arranged on both sides of the first shell body, and the first shell body is twisted along its axial direction to form a twisted hub;

[0009] The flange includes a first flange arranged on the outer surface of the second shell body, and a second flange arranged on the outer surface of the side of the first shell body away from the second shell body.

[0010] In some embodiments, the second shell is internally provided with a gear ring connected with the tower base.

[0011] In some embodiments, the gear ring is integrally formed with the second shell.

[0012] In some embodiments, the twist flower comprises a plurality of support surfaces and a plurality of reinforcing ribs located between the support surfaces and protruding from the support surfaces.

[0013] In some embodiments, the reinforcing ribs extend from the second shell to the third shell and in the riding direction.

[0014] In some embodiments, the number of reinforcing ribs is 5-8.

[0015] In some embodiments, the diameter of the first flange is larger than the diameter of the second flange.

[0016] In summary, the beneficial effects of the utility model are as follows:

[0017] (1) The utility model discloses a twist structure of the flower drum shell, and the reinforcing ribs are arranged along the riding direction when the bicycle advances, which plays a role in dispersing and guiding the axial stress, effectively enhances the structural stability of the flower drum shell under the action of complex loads such as torsion, lateral pressure and impact, and is particularly suitable for high-performance bicycles such as mountain bikes and road bikes that require high-strength support.

[0018] (2) The utility model discloses a plurality of reinforcing ribs and support surfaces in the twist area, which effectively disperses the stress concentration area of the twist section, enhances the overall rigidity and anti-deformation ability of the structure, and is suitable for high-strength riding conditions.

[0019] (3) The utility model discloses a gear ring integrated in the second shell of the flower drum shell and connected with the tower base, which can be directly engaged with the tower base structure, improves the compactness of the structure, simplifies the assembly process, and reduces the number of parts and tolerance accumulation. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is a three-dimensional structure schematic diagram of the utility model.

[0021] Fig. 2 It is a side view structure schematic diagram of the utility model.

[0022] The reference signs are as follows:

[0023] 1, flower drum shell;11, first shell;12, second shell;13, third shell;21, first flange;22, second flange;111, twist flower;121, gear ring;1111, support surface;1112, reinforcing rib. DETAILED DESCRIPTION

[0024] In order to deepen the understanding of the utility model, the utility model will be further described in combination with embodiments and drawings below, and the embodiments are only used to explain the utility model and do not constitute the limitation on the protection scope of the utility model.

[0025] The utility model provides a kind of twist hub shell, it is mainly applied to the rear hub structure of bicycle wheel group.The main innovation point of the hub shell is that it adopts axial twist structure, on the basis of guaranteeing structural strength, it can optimize the stress distribution of spoke, improve the torsional properties and riding stability of wheel group as a whole.

[0026] As Figs. 1-2 As shown in the figure, the twist hub shell includes a hollow cylindrical structure as a whole hub shell 1.The both ends of hub shell 1 are provided with flange 2 for connecting with bicycle spoke.The hub shell 1 is composed of three parts, first shell body 11, second shell body 12 and third shell body 13, wherein first shell body 11 is located in the middle, and second shell body 12 and third shell body 13 are arranged on the both sides of first shell body 11.

[0027] Second shell body 12 is arranged at the tower base side of first shell body 11, i.e. the side close to the free wheel mounting end, and its outer surface is provided with first flange 21 for connecting spoke.The internal structure is provided with gear ring 121 for connecting with tower base assembly.Preferably, gear ring 121 is integrally formed with second shell body 12, i.e. gear ring 121 and shell structure are integrated structure, which avoids the problems such as loosening and misaligned teeth caused by the processing mode of metal gear ring heating and pressing or gluing in traditional hub, thereby improving the stability and processing efficiency of product, and also helps to further improve the lightweight of bicycle.

[0028] Further, third shell body 13 is located at the side of first shell body 11 away from tower base, and is connected with spoke on the other side of wheel.In order to realize structural symmetry and tension balance, second flange 22 is arranged on the outer surface of third shell body 13.Compared with first flange 21, the diameter of second flange 22 is slightly smaller, forming an asymmetric flange layout structure, and this design is especially suitable for bicycle wheel group under tower base offset structure, which can optimize the tension distribution of spoke and prevent rim deviation.

[0029] In the embodiment, first shell body 11 is the core structure of hub shell, and its feature is that twist structure is formed along axial direction, i.e. "twist flower 111".The twist flower structure is not a simple straight cylinder, but a plurality of inclined angle surfaces are designed, so that the whole first shell is twisted in spiral shape in axial direction, thereby improving the overall torsional rigidity.

[0030] In a preferred embodiment, the twist 111 is composed of several support surfaces 1111, which are slightly inclined along the hub axis and symmetrically arranged around the central axis. Several reinforcing ribs 1112 are arranged between each support surface 1111. The reinforcing ribs 1112 extend from the second shell 12 towards the third shell 13 and are distributed in the riding direction, i.e. when the bicycle is moving forward, the reinforcing ribs are arranged along the forward direction, which plays a role in dispersing and guiding the axial stress.

[0031] The reinforcing ribs 1112 are protruding structures protruding from the outer surface of the support surface 1111, and the cross section can be semicircular, trapezoidal or other polygonal shape, and the specific shape can be optimized according to the mechanical analysis in actual application. The structure effectively enhances the structural stability of the hub shell under complex loads such as torsion, lateral pressure and impact, and is particularly suitable for high-performance bicycles such as mountain bikes and road bikes that require high strength support.

[0032] The number of reinforcing ribs 1112 in this application is 5-8, and the preferred embodiment uses 6 reinforcing ribs. The reinforcing ribs are evenly distributed between adjacent support surfaces in the circumferential direction of the hub shell, thereby effectively enhancing the axial, radial and torsional stress of the hub shell during riding without increasing the overall weight, and improving the strength and fatigue resistance of the overall structure. The specific number of reinforcing ribs can also be adjusted according to the actual load requirements to adapt to the mechanical characteristics of different wheel group structures or riding scenarios.

[0033] The tooth shape of the ring gear 121 can be selected according to the meshing mode with the tower base, and the common rectangular tooth, triangular tooth or involute tooth type can be selected, and the material can be reinforced polymer composite material or high-strength aluminum alloy. The cooperation gap between the inner hole structure and the ratchet of the tower base is controlled within 0.05mm to ensure high efficiency energy transmission and stable meshing during transmission.

[0034] In actual use, the diameter of the first flange 21 is preferably 60-70mm, and the diameter of the second flange 22 is 50-60mm, and the difference between the two is about 10mm, which can further improve the tension balance of the wheel group by adjusting the arrangement of the spokes (such as using 2 cross or 3 cross weaving method).

[0035] The flange 2 is the key part of the connection between the spoke and the hub shell, and in the present application, the flange is divided into a first flange 21 and a second flange 22, which are arranged on the outer surface of the second shell 12 and the third shell 13 respectively. The outer side of the flange 2 is provided with a plurality of uniformly distributed through holes for penetrating the spokes, which can be round holes or oval holes, and the corresponding chamfer treatment is designed according to the shape of the spoke head to avoid stress concentration. The arrangement angle of the through hole and the axis has a certain included angle, generally 3°-6°, which is convenient for the spoke to be connected to the rim at a reasonable angle.

[0036] The torsion hub shell of the utility model can effectively reduce the shell distortion caused by treading after being installed on the rear wheel group of the whole vehicle, effectively improve the transmission efficiency, reduce the weight of the whole hub by the application of the high polymer material, improve the lightweight of riding, at the same time, the integrated design of the gear ring reduces the assembly error and improves the overall reliability.

[0037] In conclusion, the torsion hub shell of the utility model has obvious advantages in structure design, material application and use performance, and is suitable for popularization and application in various high-end bicycle products.

[0038] It should be noted that the implementation modes not shown or described in the drawings or the specification are known to those skilled in the art, and are not described in detail. In addition, the definitions of the elements and methods described above are not limited to the specific structures, shapes or ways mentioned in the embodiments.

[0039] It should also be noted that this document can provide examples of parameters containing specific values, but these parameters do not necessarily equal the corresponding values, but can be approximately equal to the corresponding values within an acceptable error tolerance or design constraint. The direction terms mentioned in the embodiments, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc. are only with reference to the direction of the drawings, and are not intended to limit the protection scope of the present application.

[0040] The above description shows and describes the preferred embodiments of the utility model, as mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be considered as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein by the above teaching or related technical or knowledge. The modification and change made by those skilled in the art without departing from the spirit and scope of the utility model should be within the protection scope of the claims of the utility model.

Claims

1. A torsion hub shell, characterized in that, It includes a hollow drum shell (1), the surface of which is provided with two outwardly extending flanges (2), the flanges (2) being used to connect spokes; The drum shell (1) includes a first shell (11), and a second shell (12) and a third shell (13) disposed on both sides of the first shell (11). The first shell (11) is twisted along its axial direction to form a twisted pattern (111). The flange (2) includes a first flange (21) disposed on the outer surface of the second housing (12) and a second flange (22) disposed on the outer surface of the first housing (11) on the side away from the second housing (12).

2. The torsion hub housing according to claim 1, characterized in that, The inner side of the second housing (12) is provided with a toothed ring (121) that is coupled to the tower base.

3. The torsion hub housing according to claim 2, characterized in that, The gear ring (121) is integrally formed with the second housing (12).

4. The torsion hub housing according to claim 1, characterized in that, The twist (111) includes a plurality of support surfaces (1111) and a plurality of reinforcing ribs (1112) located between each of the support surfaces (1111) and protruding from the support surfaces (1111).

5. The torsion hub housing according to claim 4, characterized in that, The reinforcing rib (1112) extends from the second housing (12) toward the third housing (13) and along the riding direction.

6. The torsion hub housing according to claim 5, characterized in that, The number of the reinforcing ribs (1112) is 5-8.

7. The torsion hub housing according to claim 1, characterized in that, The diameter of the first flange (21) is larger than the diameter of the second flange (22).

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