Gear set and bicycle

Abstract

The utility model relates to a bicycle technical field, specifically disclose a kind of gear disc group and bicycle, the gear disc group includes pedestal and at least two gear disc structures, pedestal has rotation axis, at least two gear disc structures are along the rotation axis of pedestal interval arrangement, gear disc structure and pedestal integral are 3D printing molding integrated structure, improve the alignment accuracy between different gear disc structures, between gear disc structure and pedestal, reduce the precision loss due to assembly fit gap, improve the assembly accuracy of gear disc group whole, and make gear disc structure and pedestal between not need to set assembly joint, reduce the strength loss due to assembly connecting point, improve the overall strength of gear disc group.3D printing molding integrated structure can be directly from design model to finished product, reduce intermediate process, reduce production cost, improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and in particular to a chainring assembly and a bicycle. Background Technology

[0002] The sprocket is a key component in a chain drive system, typically driven by or driving the chain. In many mechanical structures, such as the chain drive system of a bicycle, the sprocket assembly consists of multiple stacked sprockets. An adjustment mechanism allows the chain to switch between different sprockets, thereby changing the characteristics of the drive system, such as the reduction ratio.

[0003] In related technologies, gear discs are generally produced by casting, forging, or stamping to obtain the blank, after which the tooth shape needs to be milled. This process is cumbersome, time-consuming, and costly. After multiple gear discs are machined, they need to be assembled using connecting structural components. This not only increases the processing cost but also brings problems such as loss of machining accuracy due to assembly gaps, potential assembly strength defects, and wear at the assembly points leading to a decrease in lifespan or performance. Utility Model Content

[0004] The purpose of this utility model is to provide a gear set and a bicycle to solve the problems of inconvenient gear set assembly and easy loss of overall machining accuracy and strength in related technologies.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a toothed disc assembly, the toothed disc assembly including a base and at least two toothed disc structures, the at least two toothed disc structures being spaced apart along the rotation axis of the base, and the toothed disc structures and the base being an integral structure formed by 3D printing.

[0007] In one embodiment, the toothed disc structure includes a disc body and teeth disposed on the outer periphery of the disc body, wherein the strength of the teeth is higher than the strength of the disc body, and / or the hardness of the teeth is higher than the hardness of the disc body.

[0008] In one embodiment, the teeth are provided with a guide surface on the sidewall in the direction of the rotation axis of the base, the guide surface being used to guide the chain to switch between different toothed disc structures.

[0009] In one embodiment, a reinforcing structure is provided at the junction of the toothed disc structure and the base, and / or, the junction of the teeth and the disc body is a smooth curved surface transition.

[0010] In one embodiment, the base is a metal base, and / or the toothed disc structure is a metal toothed disc.

[0011] In one embodiment, the diameters of at least two of the toothed disc structures increase sequentially along the rotation axis of the base.

[0012] In one embodiment, a first weight-reducing structure is provided within the base, and / or a second weight-reducing structure is provided within the toothed disc structure.

[0013] In one embodiment, the base includes a plurality of support rods, the toothed disc structure has a central hole, the plurality of support rods are disposed in the central hole and are spaced apart circumferentially along the inner wall of the central hole, and the support rods and the toothed disc structure are integrally formed by 3D printing.

[0014] In one embodiment, the gear assembly is rotatably mounted on the axle, and a tower base is provided between the base and the axle. The gear assembly and the tower base are integrally formed by 3D printing.

[0015] Secondly, this utility model provides a bicycle, including a drive assembly, a wheel assembly, and a sprocket assembly as described above. The base of the sprocket assembly is connected to the wheel assembly in a transmission manner, and the sprocket structure of the sprocket assembly is connected to the drive assembly in a chain transmission manner.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention provides a chainring assembly and a bicycle. The chainring assembly, by designing the chainring structure and base as a 3D-printed integral structure, improves the alignment accuracy between different chainring structures and between the chainring structure and the base, reducing accuracy loss due to assembly clearances and improving the overall assembly accuracy of the chainring assembly. Furthermore, the integrated design eliminates the need for assembly seams between the chainring structure and the base, reducing strength loss due to assembly connection points. The 3D-printed integral structure, through its continuous material structure, disperses stress, improving the overall strength of the chainring assembly. The 3D-printed integral structure can be directly processed from the design model to the finished product, reducing intermediate processes, lowering production costs, and allowing for on-demand material use, reducing material waste, further reducing costs, improving production efficiency, and achieving high processing accuracy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the toothed disc assembly in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram showing the installation positions of the gear assembly and the wheel axle in an embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram showing the relative positions of the gear disc assembly base and the wheel axle in an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram showing the installation position of the sprocket assembly on a bicycle in an embodiment of this utility model.

[0022] In the picture:

[0023] 1. Base; 11. Support rod;

[0024] 2. Gear disc structure; 21. Disc body; 22. Teeth; 221. Guide surface; 23. Center hole;

[0025] 3. Strengthen the structure;

[0026] 4. Drive assembly; 5. Wheel assembly; 6. Chain;

[0027] 7. Hub assembly; 71. Hub body; 72. Axle; 73. Freehub base. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] like Figures 1 to 4 As shown, an embodiment of the first aspect of this utility model provides a geared disk assembly, which includes a base 1 and at least two geared disk structures 2. The base 1 has a rotation axis, and the at least two geared disk structures 2 are spaced apart along the rotation axis of the base 1. The geared disk structures 2 and the base 1 are integrally formed by 3D printing. This embodiment improves the alignment accuracy between different geared disk structures 2 and between geared disk structures 2 and the base 1 by designing the geared disk structures 2 and the base 1 as an integral 3D printed structure, reduces the accuracy loss caused by assembly gaps, and improves the overall assembly accuracy of the geared disk assembly. Furthermore, the integrated design eliminates the need for assembly seams between the geared disk structures 2 and the base 1, reducing strength loss caused by assembly connection points. The 3D printed integral structure, through its continuous material structure, disperses stress and improves the overall strength of the geared disk assembly. 3D printed monolithic structures can be directly processed from design models to finished products, reducing intermediate processes and production costs. Furthermore, materials can be used on demand, reducing material waste and further lowering costs and improving production efficiency. In addition, the high processing precision solves the problems of inconvenient gear assembly and easy loss of overall processing precision and strength in related technologies.

[0033] 3D printing is an additive manufacturing technology that constructs three-dimensional objects by adding material layer by layer. The specific steps include model design, slicing, and layer-by-layer printing. Specifically, a three-dimensional model is created based on the toothed disc structure 2 and the base 1. This model is then sliced ​​into multiple two-dimensional layers to generate printing paths. Based on the slicing data, the 3D printer adds material layer by layer to construct the entire solid structure of the toothed disc structure 2 and the base 1. While 3D printing is an existing technology, this embodiment primarily utilizes a 3D-printed integral structure for the toothed disc structure 2 and the base 1. This reduces precision loss due to assembly gaps, improves the overall assembly accuracy of the toothed disc assembly, and reduces strength loss due to assembly connection points. The process is fast, with low pollution and low cost.

[0034] In other embodiments, the integral structure formed by the toothed disc structure 2 and the base 1 may include multiple structural layers and multiple connecting layers. At least one connecting layer is provided between any two adjacent structural layers. The structural layers may be, but are not limited to, metal layers or carbon fiber layers, and the connecting layers may be, but are not limited to, molten layers or photocurable resin layers. Multiple structural layers are connected and joined together by the connecting layers to form an integral structure, thereby reducing the precision loss caused by assembly clearances between the toothed disc structure 2 and the base 1, and reducing the strength loss caused by assembly connection points. The multiple structural layers and multiple connecting layers may be arranged along the rotation axis of the base 1.

[0035] In some embodiments, the gear disc structure 2 includes a disc body 21 and teeth 22 disposed on the outer periphery of the disc body 21. The teeth 22 and the disc body 21 are integrally formed by 3D printing. The strength of the teeth 22 is higher than that of the disc body 21, and / or the hardness of the teeth 22 is higher than that of the disc body 21. By making the strength or hardness of the teeth 22 higher than that of the disc body 21, the gear disc can better withstand high loads and frequent gear shifting operations during use, reducing wear and damage to the teeth 22, thereby extending the service life of the gear disc.

[0036] In this embodiment, when the toothed disc structure 2 is printed using the same material, the single-layer printing height of the tooth 22 can be less than that of the disc body 21. This increases the packing density of the tooth 22, thereby achieving higher strength and hardness. The entire toothed disc structure 2, as well as the toothed disc structure 2 and the base 1, can be printed using the same material, avoiding uneven distribution of stress, heat, and other conditions caused by different materials. Alternatively, different materials can be selected for printing depending on the different requirements of the tooth 22 and the disc body 21. The tooth 22 can use high-strength, high-hardness materials, such as titanium alloys or high-strength steel, while the disc body 21 can use lighter materials, such as aluminum alloys or composite materials, achieving optimized material utilization. To address the varying material performance requirements at different locations on the toothed disc, the inventors attempted to use small, piece structures made of different materials and processes in two different parts of the toothed disc: the tooth section 22 and the disc body 21. These different small pieces were then assembled into a single toothed disc, and multiple toothed discs were further assembled into a toothed disc assembly. However, the use of different small pieces for the tooth section 22 and the disc body, connected by their edges, could easily lead to assembly errors. In this embodiment, the tooth section 22 and the disc body 21 are a single 3D-printed structure, resulting in high machining precision and reduced machining errors. The rotation axis of the toothed disc structure 2 is the same as the rotation axis of the base 1.

[0037] In some embodiments, the surface of the tooth 22 is a polished surface, that is, the tooth disk structure 2 can be used directly after being processed into a 3D printed integral structure. If the application scenario of the tooth disk assembly requires high surface performance of the tooth 22, the surface of the tooth 22 can also be designed as a polished surface. After polishing the surface of the tooth 22 of the tooth disk structure 2 with polishing equipment, the usage requirements can be met, which is convenient for processing.

[0038] In some embodiments, the toothed portion 22 is provided with a guide surface 221 on the side wall in the direction of the rotation axis of the base 1. The guide surface 221 is used to guide the chain 6 to switch between different toothed disc structures 2, so that the chain 6 switches between different toothed disc structures 2 more smoothly, reducing the jumping and jamming of the chain 6. This not only improves the smoothness of gear shifting, but also reduces the impact on the chain 6 and toothed disc structure 2 during gear shifting, and extends the service life of the chain 6 and toothed disc structure 2.

[0039] Among them, the gear disk structure 2 is a one-piece structure formed by 3D printing. The guide surface 221 can be formed by printing, which is convenient to process. Moreover, the guide surface 221 of different teeth 22 can also be designed with different shapes or different angles to meet different shifting needs.

[0040] In some embodiments, a reinforcing structure 3 is provided at the joint between the gear disk structure 2 and the base 1. The reinforcing structure 3 can enhance the joint connection strength between the gear disk structure 2 and the base 1, reduce stress concentration, effectively reduce fracture caused by high load and frequent gear shifting, and improve the overall structural stability of the gear disk assembly. And / or, the joint between the tooth 22 and the disk body 21 is a smooth curved surface transition, which can effectively disperse stress and reduce stress concentration, especially when the tooth 22 is subjected to high load, reducing damage to the tooth 22 and extending the service life of the gear disk. The reinforcing structure 3 and the smooth curved surface transition structure at the joint between the tooth 22 and the disk body 21 can be directly printed in the 3D printing process, reducing secondary processing and increasing processing efficiency.

[0041] Optionally, the reinforcing structure 3 may be, but is not limited to, a reinforcing rib, and the shape of the reinforcing rib may be, but is not limited to, rod-shaped, radial, or annular, and can be selected according to the connection requirements between the toothed disc structure 2 and the base 1.

[0042] In some embodiments, the base 1 is a metal base 1, that is, the base 1 is a metal base 1 formed by 3D printing using metal material, which has high strength and can withstand large loads. And / or, the gear disk structure 2 is a metal gear disk, that is, the gear disk structure 2 is a metal gear disk formed by 3D printing using metal material, which has high strength and can withstand large loads and frequent gear shifting operations, and can further improve the overall structural strength and machining accuracy of the gear disk assembly.

[0043] Optionally, the base 1 and the toothed disc structure 2 may be made of materials including, but not limited to, steel, aluminum alloy and titanium alloy.

[0044] In some embodiments, the diameters of at least two toothed disc structures 2 increase sequentially along the rotation axis of the base 1, which facilitates smooth speed changes of the chain 6, reduces chain 6 jumping and jamming, and improves the smoothness of speed changes.

[0045] In some embodiments, a first weight-reducing structure is provided in the base 1, and / or a second weight-reducing structure is provided in the gear disk structure 2. By providing a first weight-reducing structure in the base 1 and a second weight-reducing structure in the gear disk structure 2, the overall weight of the gear disk assembly can be reduced, the degree of lightweighting can be improved, the rotational inertia of the gear assembly can be reduced, and the operation can be facilitated.

[0046] In this embodiment, the first weight-reducing structure can be set in the less stress-bearing parts of the base 1, while retaining sufficient material in the more stress-bearing parts. For example, the base 1 can adopt a honeycomb or grid-like hollow structure to reduce weight while maintaining sufficient strength. Similarly, the second weight-reducing structure can also be set in the less stress-bearing parts of the toothed disc structure 2, such as the disc body 21, while retaining sufficient material in the more stress-bearing parts, such as the teeth 22.

[0047] In some embodiments, the base 1 includes multiple support rods 11, and the gear disk structure 2 has a central hole 23. The multiple support rods 11 are disposed within the central hole 23 and are spaced circumferentially along the inner wall of the central hole 23. The support rods 11 and the gear disk structure 2 are integrally formed by 3D printing; that is, the support rods 11 are arranged along the axial direction of the gear disk and connect and support the multiple gear disk structures 2. The multiple support rods 11 spaced circumferentially along the inner wall of the central hole 23 can form multiple support joint points. The multiple support rods 11 and the multiple gear disk structures 2 can be combined horizontally and vertically to form a frame structure, effectively dispersing stress. Furthermore, adjacent gear disk structures 2 and adjacent support rods 11 can be spaced apart, further improving the overall lightweighting of the gear disk assembly. The spaced arrangement of the multiple support rods 11 can form multiple connecting grooves, facilitating connection with external structures. For example, the connecting grooves can be used to connect with the bicycle's freehub base.

[0048] like Figures 1 to 4 As shown, in some embodiments, the gear assembly is rotatably mounted on the axle 72, and a base 73 is provided between the base 1 and the axle 72. The gear assembly and the base 73 are integrally formed by 3D printing. This integral 3D printing structure reduces the assembly requirements of the base 73 and the gear assembly, improves the overall strength and stability of the base 73 and the gear assembly, and allows the stress to be more evenly distributed in the integral 3D printing structure of the base 73 and the gear assembly when under load, reducing the risk of stress concentration and thus extending the service life of the base 73 and the gear assembly.

[0049] Specifically, the gear assembly is connected to the wheel assembly 5 via the hub assembly 7. The hub assembly 7 may include a hub body 71, an axle 72, and a freehub base 73. The hub body 71 has a central hole 23, and the axle 72 is rotatably connected to the hub body 71 through the central hole 23. Multiple ratchet teeth are circumferentially arranged on the inner wall of the central hole 23 of the hub body 71. The freehub base 73 is rotatably mounted on the axle 72, and at least partially disposed within the central hole 23. The freehub base 73 has a pawl that can selectively engage with the ratchet teeth. The freehub base 73 and the hub body 71 are connected by a ratchet and pawl. When the gear assembly rotates forward under external force, the ratchet and pawl engage, and the gear assembly can drive the hub body 71 to rotate via the freehub base 73, thereby driving the wheel and other components fixed to the hub body 71 to rotate. Because the ratchet and pawl can only perform one-way transmission, when the gear set rotates in the opposite direction under the action of external force, for example, when a bicycle is gliding, the pawl and ratchet are not engaged and are separated. The gear set can drive the freehub base 73 to rotate freely around the axle 72, and the hub body 71 can also rotate freely around the axle 72. There is no torque transmission between the hub body 71 and the freehub base 73.

[0050] like Figures 1 to 4 As shown, an embodiment of the second aspect of this utility model provides a bicycle, including a drive assembly 4, a wheel assembly 5, and a sprocket assembly as described in any of the above embodiments. The base 1 of the sprocket assembly is connected to the wheel assembly 5 in a transmission connection. The sprocket structure 2 of the sprocket assembly is connected to the drive assembly 4 in a transmission connection via a chain 6. The drive assembly 4 can drive the sprocket structure 2 to rotate via the chain 6. The rotation of the sprocket structure 2 can drive the wheel assembly 5 to rotate via the base 1. By adopting a 3D-printed integral structure for the sprocket structure 2 and the base 1, more precise tooth shape and size can be achieved, further improving transmission efficiency.

[0051] The drive assembly 4 refers to the drive structure of the bicycle. For example, the drive assembly 4 may include a left crank, a right crank, and a chainring that are connected by transmission. The left and right cranks drive the chainring to rotate, and the chainring is connected to the chainring structure 2 by a chain 6. The wheel assembly 5 refers to the rotating and traveling structure of the bicycle. For example, the wheel assembly 5 may be a rear wheel or a front wheel. The wheel assembly 5 includes a hub, and the base 1 may be connected to the hub by transmission.

[0052] In some embodiments, the bicycle further includes a frame and an adjustment mechanism. The adjustment mechanism includes a shifter and a lever. The lever is movably mounted on the frame. The shifter is connected to the lever. The shifter can be mounted on the handlebars of the frame. Rotating or sliding the handlebar can move the lever. The lever can shift the chain 6 to different sprocket structures 2 for gear shifting.

[0053] Since it includes the aforementioned sprocket assembly, the bicycle of this utility model embodiment has all the advantages and beneficial effects of the above embodiments, which will not be repeated here.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A toothed disc assembly, characterized in that, The toothed disk assembly includes a base (1) and at least two toothed disk structures (2). The base (1) has a rotation axis, and the at least two toothed disk structures (2) are spaced apart along the rotation axis of the base (1). The toothed disk structures (2) and the base (1) are integrally formed by 3D printing.

2. The toothed disc assembly according to claim 1, characterized in that, The toothed disc structure (2) includes a disc body (21) and teeth (22) disposed on the outer periphery of the disc body (21), wherein the strength of the teeth (22) is higher than the strength of the disc body (21), and / or the hardness of the teeth (22) is higher than the hardness of the disc body (21).

3. The toothed disc assembly according to claim 2, characterized in that, The tooth (22) has a guide surface (221) on the side wall in the direction of the rotation axis of the base (1). The guide surface (221) is used to guide the chain (6) to switch between different tooth disc structures (2).

4. The toothed disc assembly according to claim 2, characterized in that, A reinforcing structure (3) is provided at the joint position between the toothed disc structure (2) and the base (1), and / or, the joint position between the tooth (22) and the disc body (21) is a smooth curved surface transition.

5. The toothed disc assembly according to any one of claims 1-4, characterized in that, The base (1) is a metal base (1), and / or the toothed disc structure (2) is a metal toothed disc.

6. The toothed disc assembly according to any one of claims 1-4, characterized in that, The diameters of at least two of the toothed disc structures (2) increase sequentially along the rotation axis of the base (1).

7. The toothed disc assembly according to any one of claims 1-4, characterized in that, The base (1) is provided with a first weight-reducing structure, and / or the toothed disc structure (2) is provided with a second weight-reducing structure.

8. The toothed disc assembly according to any one of claims 1-4, characterized in that, The base (1) includes multiple support rods (11), the toothed disc structure (2) has a central hole (23), the multiple support rods (11) are disposed in the central hole (23) and the multiple support rods (11) are circumferentially spaced along the inner wall of the central hole (23), and the support rods (11) and the toothed disc structure (2) are an integral structure formed by 3D printing.

9. The toothed disc assembly according to any one of claims 1-4, characterized in that, The gear disk assembly is rotatably mounted on the axle, and a tower base is provided between the base (1) and the axle. The gear disk assembly and the tower base are integrally formed by 3D printing.

10. A bicycle, characterized in that, It includes a drive assembly (4), a wheel assembly (5) and a geared disc assembly as described in any one of claims 1-9, wherein the base (1) of the geared disc assembly is connected to the wheel assembly (5) in a transmission manner, and the geared disc structure (2) of the geared disc assembly is connected to the drive assembly (4) in a transmission manner via a chain (6).

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