Transmission fluted disc for bicycle

Abstract

The utility model provides a transmission fluted disc for a bicycle. The transmission fluted disc comprises a first disc body, a second disc body and a supporting layer. The first disc body is made of a first non-metal material, and the outer periphery of the first disc body is provided with a plurality of teeth. The second disc body is made of a second non-metal material, the second disc body covers one side of the first disc body, an inner space is defined by the second disc body and the first disc body, and the inner space is annular. The supporting layer is made of a third non-metal material and is arranged in the internal space.

Description

TECHNICAL FIELD

[0001] The present application relates to a sprocket, in particular, a transmission sprocket for a bicycle. BACKGROUND

[0002] In the sport of cycling, the weight of the bicycle causes the rider to expend unnecessary energy. Therefore, how to reduce the weight of the bicycle has become one of the main directions of the development of bicycles.

[0003] In reducing the weight of the bicycle, in addition to improving the design of the bicycle structure, the weight of the bicycle can also be reduced by changing the type of bicycle material. Due to the difference in material properties, after changing the type of bicycle material, the original design of the bicycle structure may not provide sufficient bicycle strength. Therefore, corresponding to the change in the bicycle material, the design of the bicycle structure should also be adjusted. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a transmission sprocket for a bicycle, which has the advantages of light weight and high structural strength.

[0005] To achieve the above advantages, an embodiment of the present application provides a transmission sprocket for a bicycle, comprising: a first disc body, a second disc body, and a support layer. The first disc body is made of a first non-metallic material. The first disc body has a plurality of teeth on the outer periphery. The second disc body is made of a second non-metallic material. The second disc body covers one side of the first disc body and surrounds an internal space with the first disc body, and the internal space is annular. The support layer is made of a third non-metallic material and is arranged in the internal space, and the third non-metallic material is different from the first non-metallic material and the second non-metallic material.

[0006] In an embodiment, the first disc body or the second disc body described above has a plurality of ribs formed on the side facing the internal space. The ribs extend along the radial direction of the transmission sprocket, and the internal space is divided into a plurality of compartments by the ribs.

[0007] In an embodiment, the first disc body described above includes a first disc surface and a first annular wall protruding from the first disc surface.

[0008] In an embodiment, the second disc body described above includes a second disc surface and a second annular wall protruding from the second disc surface, and the first annular wall and the second annular wall are in contact with each other.

[0009] In an embodiment, the first disc body described above is provided with a central axis, the first disc surface, the second disc surface of the second disc body, and the first annular wall or the second annular wall together constitute the internal space, and the distance between the first disc surface and the second disc surface gradually decreases in the direction away from the central axis along the radial direction by the first annular wall.

[0010] In one embodiment, the first non-metallic material and the second non-metallic material are fiber composite materials, and the third non-metallic material is a foamed material.

[0011] In another embodiment, the first non-metallic material and the second non-metallic material are the same material.

[0012] In one embodiment, the first disc body and the second disc body are integrally formed.

[0013] The present application also provides a manufacturing method of the transmission disc for a bicycle, comprising the following steps. A support layer made of a third non-metallic material is arranged on at least one of a first disc body made of a first non-metallic material and a second disc body made of a second non-metallic material. The first disc body and the second disc body are connected to form an internal space, and the support layer is located in the internal space. The first disc body, the second disc body, and the support layer are heated to make the first disc body and the second disc body engage with each other, and make the support layer expand to support the internal space.

[0014] In one embodiment, one of the first disc body or the second disc body is formed with a plurality of ribs on a side close to the other one of the first disc body or the second disc body, the ribs extend along the radial direction of the transmission disc, and the internal space is divided into a plurality of compartments by the ribs.

[0015] In one embodiment, in the step of arranging the support layer on at least one of the first disc body and the second disc body, the support layer is arranged on each of the first disc body and the second disc body, and then is heated to expand to support the internal space. As described above, in the transmission disc for a bicycle and the manufacturing method thereof according to the embodiments of the present application, because the first disc body and the second disc body are made of non-metallic materials, the transmission disc has the advantage of light weight. Moreover, because the support layer made of a non-metallic material is arranged in the internal space surrounded by the first disc body and the second disc body, the first disc body and the second disc body can be supported by the support layer, so that the structural strength of the transmission disc for a bicycle can be strengthened while the advantage of light weight is maintained.

[0016] The details of other functions and embodiments of the present application are described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 is an exploded view of the transmission disc for a bicycle in one embodiment of the present application;

[0019] Figure 2 Fig. 1 is a perspective view of a transmission gear disc for a bicycle according to an embodiment of the present application; Figure 1 Fig. 2 is a sectional view of the transmission gear disc for a bicycle according to an embodiment of the present application;

[0020] Figure 3 Fig. 3 is a sectional view of the transmission gear disc for a bicycle according to an embodiment of the present application; Figure 1 Fig. 4 is a sectional view of the transmission gear disc for a bicycle according to an embodiment of the present application;

[0021] Figure 4 Fig. 5 is a sectional view of the transmission gear disc for a bicycle according to an embodiment of the present application; Figure 3 Fig. 6 is a sectional view of the transmission gear disc for a bicycle according to an embodiment of the present application;

[0022] Figure 5 Fig. 7 is a sectional view of the transmission gear disc for a bicycle according to an embodiment of the present application; Figure 1 Fig. 8 is a sectional view of the transmission gear disc for a bicycle according to an embodiment of the present application;

[0023] Figure 6 Fig. 9 is a flow chart of a manufacturing method of the transmission gear disc for a bicycle according to an embodiment of the present application.

[0024] Symbol explanation

[0025] 100: transmission gear disc for a bicycle 1: first disc body

[0026] 1a: tooth 11: first disc wall

[0027] 110: first disc surface 111: groove

[0028] 112: rib 12: first annular wall

[0029] 13: fixed portion 2: second disc body

[0030] 21: second disc wall 210: second disc surface

[0031] 211: rib 211a: notch

[0032] 212: first ring portion 213: second ring portion

[0033] 22: second annular wall 3: support layer

[0034] 4: claw portion 41: connecting hole

[0035] 5: gear disc 6: upper chain screw

[0036] S: inner space A: center axis

[0037] A-A: sectional surface S1: step

[0038] S2: step S3: step DETAILED DESCRIPTION

[0039] In the following text, the terms used in the description of embodiments according to this application, such as "upper" and "lower" indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings. These terms are used merely for convenience in describing this application and are not intended to limit it; that is, they do not indicate or imply that the mentioned components must have a specific orientation or be constructed in a specific orientation. Furthermore, the terms "first" and "second" mentioned in this specification or the claims are only used to name components or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of components.

[0040] Figure 1 This is an exploded view of a bicycle drive sprocket in one embodiment of this application. Figure 2 for Figure 1 A schematic diagram of the geared drive sprocket used in a bicycle. Figure 3 for Figure 1 A schematic diagram of the cross section along section AA. Figure 4 for Figure 3 A cross-sectional view after the support layer has been removed. Figure 5 for Figure 1 A schematic diagram of the back of the second disc.

[0041] like Figures 1 to 3 As shown, a bicycle drive chainring 100 in one embodiment of this application includes: a first chainring 1, a second chainring 2, and a support layer 3. The first chainring 1 is made of a non-metallic material, such as carbon fiber composite, glass fiber composite, plastic steel, or other high-strength polymer materials. The first chainring 1 has multiple teeth 1a on its outer periphery. The second chainring 2 is also made of a non-metallic material, such as carbon fiber composite, glass fiber composite, plastic steel, or other high-strength polymer materials. The first chainring 1 and the second chainring 2 can be made of the same material, depending on the required strength and weight of the finished product. The second chainring 2 covers one side of the first chainring 1 and together with the first chainring 1, forms an internal space S. The internal space S is annular, and the center of the second chainring 2 and the internal space S is located on the central axis A of the first chainring 1. Figure 3 As shown, the support layer 3 is made of a third non-metallic material and is disposed within the internal space S. The third non-metallic material is different from the first and second non-metallic materials, but will be described in detail later.

[0042] In this embodiment, the central shaft of the bicycle drive sprocket 100 and the central shaft of the second disc body 2 also coincide with the central shaft A.

[0043] In this embodiment, the bicycle drive sprocket 100 further includes, for example, a claw 4, which is used for engaging with, for example, the bicycle crank (not shown) and the sprocket 5 (see figure). Figure 2Connection. The claw 4 may be cross-shaped, but there are no particular limitations. The center of the claw 4 is located on the bottom bracket A and has a connection hole 41 suitable for connection with the bicycle crank. The material of the claw 4 is not particularly limited and can be selected according to requirements.

[0044] like Figures 1 to 3 As shown, the first disc body 1 in this embodiment can be integrally molded using carbon fiber composite material. When the bicycle drive sprocket 100 is combined with the bicycle frame (not shown), the first disc body 1 is located, for example, on the side of the bicycle drive sprocket 100 away from the bicycle frame. The first disc body 1 is, for example, annular and includes a first disc wall 11, a first annular wall 12, and a plurality of fixing parts 13.

[0045] Continuing from the above, in this embodiment, the first disc wall 11 has a first disc surface 110 on the side facing the second disc body 2 (i.e., the side of the first disc wall 11 facing the bicycle frame when assembled). The normal direction of the first disc surface 110 is, for example, parallel to the central axis A. In this embodiment, the first disc wall 11 has a plurality of grooves 111, and the first disc surface 110 is, for example, the bottom surface of the grooves 111, but is not limited thereto. The teeth 1a of the first disc body 1 are, for example, located at the outer periphery of the first disc wall 11.

[0046] In this embodiment, the first annular wall 12 is located at the inner periphery of the first disc wall 11. The first annular wall 12 protrudes toward the second disc body 2, for example, from the surface of the first disc surface 110 along an extension direction parallel to the central axis A of the bicycle drive chainring 100. The outer wall surface of the first annular wall 12 (the wall surface of the first annular wall 12 facing away from the central axis A) is, for example, perpendicular to the first disc surface 110, but is not limited thereto.

[0047] Subsequently, the fixing part 13 is, for example, a plurality of blocks protruding from the inner wall surface of the first annular wall 12 (the wall surface of the first annular wall 12 facing the central axis A) toward the central axis A of the bicycle drive chainring 100. The number of fixing parts 13 corresponds, for example, to the number of the endpoints of the claw part 4, and the shape of the fixing part 13 corresponds, for example, to the shape of the endpoints of the claw part 4.

[0048] When the first disc 1 and the claw 4 are assembled, each end of the claw 4 is connected to the fixing part 13 of the first disc 1. The connection method between the fixing part 13 and the claw 4 is not limited, such as screwing or gluing, and can be set according to requirements. The shape of the first disc 1 can be set according to requirements. In an embodiment not shown in the figure, the first disc 1 and the claw 4 can be integrally formed.

[0049] like Figures 1 to 3 and Figure 5As shown, in particular, the second disc body 2 can be integrally formed using a carbon fiber composite material. In the present embodiment, the outer diameter and the inner diameter of the second disc body 2 are, for example, smaller than the outer diameter and the inner diameter of the first disc body 1, respectively. The second disc body 2, for example, has a ring shape. The second disc body 2 includes a second disc wall 21 having a ring shape and a second ring wall 22.

[0050] As shown, in the present embodiment, the second disc wall 21 has a second disc surface 210 on the side facing the first disc body 1. The second disc wall 21, for example, extends obliquely from the side close to the central axis A toward the direction away from the central axis A and gradually approaches the first disc body 1, from the second ring wall 22. The size of the second disc wall 21, for example, is the size that can completely cover each of the grooves 111 of the first disc body 1 when the first disc body 1 and the second disc body 2 are combined. Figures 1 to 5

[0051] The shape of the second disc wall 21 is not particularly limited. In the present embodiment, the second disc wall 21, for example, has a stepped structure on the surface opposite to the second disc surface 210, and has a plurality of first ring portions 212 and a plurality of second ring portions 213. The first ring portions 212, for example, are three, and one of the first ring portions 212 is located at the outer edge of the second disc body 2. Each of the first ring portions 212 extends obliquely from the side close to the central axis A toward the direction away from the central axis A and gradually approaches the side of the second disc body 2 close to the first disc body 1. The second ring portions 213, for example, are two. Each of the second ring portions 213 is connected between the adjacent two first ring portions 212 and is not parallel to the first ring portions 212.

[0052] The second ring wall 22, for example, extends from the inner edge of the second disc surface 210 toward the side where the first disc body 1 is located along the direction of extension parallel to the central axis A of the bicycle transmission disc 100, and is adapted to be in contact with the first ring wall 12 when the second disc body 2 and the first disc body 1 are combined.

[0053] As shown, in the present embodiment, the second disc wall 21 has a second disc surface 210 on the side facing the first disc body 1. The second disc wall 21, for example, extends obliquely from the side close to the central axis A toward the direction away from the central axis A and gradually approaches the first disc body 1, from the second ring wall 22. The size of the second disc wall 21, for example, is the size that can completely cover each of the grooves 111 of the first disc body 1 when the first disc body 1 and the second disc body 2 are combined. Figure 3 Figure 4 As shown, in the present embodiment, the second disc wall 21 has a second disc surface 210 on the side facing the first disc body 1. The second disc wall 21, for example, extends obliquely from the side close to the central axis A toward the direction away from the central axis A and gradually approaches the first disc body 1, from the second ring wall 22. The size of the second disc wall 21, for example, is the size that can completely cover each of the grooves 111 of the first disc body 1 when the first disc body 1 and the second disc body 2 are combined. Figure 3 Figure 4 As shown, in the present embodiment, the second disc wall 21 has a second disc surface 210 on the side facing the first disc body 1. The second disc wall 21, for example, extends obliquely from the side close to the central axis A toward the direction away from the central axis A and gradually approaches the first disc body 1, from the second ring wall 22. The size of the second disc wall 21, for example, is the size that can completely cover each of the grooves 111 of the first disc body 1 when the first disc body 1 and the second disc body 2 are combined.

[0054] As shown, in the present embodiment, the second disc wall 21 has a second disc surface 210 on the side facing the first disc body 1. The second disc wall 21, for example, extends obliquely from the side close to the central axis A toward the direction away from the central axis A and gradually approaches the first disc body 1, from the second ring wall 22. The size of the second disc wall 21, for example, is the size that can completely cover each of the grooves 111 of the first disc body 1 when the first disc body 1 and the second disc body 2 are combined. Figure 3 Figure 4 ​​​​Therefore, by providing the grooves 111, the volume of the internal space S can be increased, and the volume and weight of the first disc body 1 can be reduced.

[0055] The detailed connection between the first disc body 1 and the second disc body 2 can be set according to requirements, for example, by heating to melt the portions of the first disc body 1 and the second disc body 2 in contact with each other to engage with each other, or an adhesive can be provided between the first disc body 1 and the second disc body 2.

[0056] Since the size relationship between the second disc body 2 and the first disc body 1 is not particularly limited, according to the relative relationship of the sizes of the first annular wall 12 and the second annular wall 22, in an embodiment not shown in the figure, the internal space S can be formed by the first disc surface 110, the second disc surface 210, and the first annular wall 12.

[0057] As shown in the figure, Figures 1 to 5 In this embodiment, the first disc body 1 and the second disc body 2 each form ribs 112 and 211 on the side facing the internal space S, the ribs (ribs 112 and 211) extend radially along the bicycle transmission disc 100, and the internal space S is divided into multiple compartments by the ribs (ribs 112 and 211). For example, the compartments are not in communication with each other, but this is not limited.

[0058] As shown in the figure, Figure 1 The ribs 112 of the first disc body 1 are formed, for example, between the two grooves 111 of the first disc wall 11, and serve as a wall surface separating the two adjacent grooves 111. As shown in the figure, Figure 5 The ribs 211 of the second disc body 2 are formed, for example, between the second disc surface 210 and the second annular wall surface, and are opposite to the ribs 112 of the first disc body 1. The ribs 112 and 211 can engage with each other when the first disc body 1 and the second disc body 2 are combined, and divide the internal space S into multiple chambers that are not in communication with each other. However, it should be understood that the detailed shape of the ribs 112 and 211 can be set according to requirements.

[0059] The arrangement position of the ribs 112 and 211 is not particularly limited, in this embodiment, the bicycle transmission disc 100 includes, for example, a plurality of upper chain screws 6, the ribs 112 and 211 each extend along the radial direction towards the arrangement position of the upper chain screws 6 from the central axis A, and the outer periphery of the second disc body 2 forms a notch 211a for the upper chain screws 6 to pass through, but this is not limited.

[0060] As shown in the figure, Figure 3 and Figure 4As shown, the support layer 3 is arranged in the inner space S, and the shape of the support layer 3 corresponds to the shape of the inner space S, for example, and can contact the side wall surface of the first disc surface 110, the second disc surface 210, the second annular wall 22, the rib 112, and the rib 211. Through contacting the first disc surface 110 and the second disc surface 210, the support layer 3 can support the first disc body 1 and the second disc body 2. The support layer 3 includes, for example, a foamed material that expands after being heated and a gel that dissolves after being heated, and the type of the material is not limited. The foamed material can be expanded microspheres, but can be selected according to requirements. The volume of the support layer 3 is not particularly limited, for example, the volume that fills the entire inner space S. Through the above configuration, when the first disc body 1 and the second disc body 2 are combined, the first disc body 1 and the second disc body 2 can be bonded to each other through the support layer 3.

[0061] Figure 6 is a flowchart of the manufacturing method in an embodiment of the present application. As shown in Figure 6 An embodiment of the present application provides a manufacturing method of a transmission tooth disc for a bicycle, comprising the following steps.

[0062] Step S1: arranging a support layer made of a third non-metallic material on at least one of a first disc body made of a first non-metallic material and a second disc body made of a second non-metallic material.

[0063] Step S2: connecting the first disc body and the second disc body to form an inner space, and the support layer is located in the inner space.

[0064] Step S3: heating the first disc body, the second disc body, and the support layer to make the first disc body and the second disc body bonded to each other, and make the support layer expand to support the inner space.

[0065] The above manufacturing method of the transmission tooth disc for a bicycle can be used to manufacture the aforementioned transmission tooth disc 100 for a bicycle.

[0066] Please refer to Figures 1 to 6 As shown in the above step S1, in this embodiment, after arranging the support layer 3 in the groove 111 of the first disc body 1 and the second disc surface 210 of the second disc body 2, respectively, the support layer 3 is heated and expanded to support the inner space S. However, in other embodiments, the support layer 3 before expansion can be arranged only on one of the first disc body 1 or the second disc body 2.

[0067] In this embodiment, in the above step S2, after the first disc body 1 and the second disc body 2 are arranged on the male mold and the female mold of the mold not shown in the figure, respectively, the first disc body 1 and the second disc body 2 are contacted with each other by abutting the male mold and the female mold, but the detailed arrangement method can be changed according to requirements.

[0068] In this embodiment, in the above step S3, the first disc body 1, the second disc body 2, and the support layer 3 before expansion are heated by heating the mold.

[0069] The state of the support layer 3 before expansion is not particularly limited and can be solid, liquid, a sheet, or a coating. The timing of providing the teeth 1a is not limited and can be before step S1, after step S3, or between any two of steps S1 to S3.

[0070] In the present embodiment, no additional adhesive is particularly provided on the first disc body 1 and the second disc body 2 in addition to the support layer 3. Specifically, in the present embodiment, the first disc body 1 and the second disc body 2 are heated and partially melted by a mold that can be heated while the first disc body 1 and the second disc body 2 are clamped at step S3, and the portions of the first disc body 1 and the second disc body 2 that contact each other are joined to each other. However, this is not limiting.

[0071] By the above-described method, since the support layer 3 is uniformly provided on the first disc body 1 and the second disc body 2 before the first disc body 1 and the second disc body 2 are joined, the distribution of the support layer 3 after expansion is uniform. Compared to a method in which the support layer 3 material is additionally poured into the internal space S, the support layer 3 of the present embodiment does not easily exert uneven stress on the first disc body 1 and the second disc body 2, and deformation of the first disc body 1 and the second disc body 2 can be avoided. In addition, since the first disc body 1 and the second disc body 2 are supported by the mold during heating and expansion, the first disc body 1 and the second disc body 2 are less likely to deform when the support layer 3 expands. In addition, since this method does not require holes to be provided in the first disc body 1 and the second disc body 2 for the support layer 3 to enter the internal space S from the outside, the structure of the first disc body 1 and the second disc body 2 is complete, the strength is high, and no additional hole sealing step is required.

[0072] As described above, in the transmission disc for a bicycle of the present embodiment, since the first disc body and the second disc body are made of non-metallic materials, the transmission disc for a bicycle has the advantage of being light in weight. In addition, since the support layer made of a non-metallic material is provided in the internal space surrounded by the first disc body and the second disc body, the first disc body and the second disc body can be supported by the support layer, and thus the structural strength of the transmission disc for a bicycle can be enhanced while the advantage of being light in weight is maintained.

[0073] The above-described embodiments and / or implementations are merely used to illustrate the preferred embodiments and / or implementations of the present application, and are not intended to limit the implementations of the present application in any form. Any person skilled in the art can make some changes or modifications to other equivalent embodiments without departing from the technical means disclosed in the present application, but such changes or modifications should be considered as substantially the same technology or embodiments of the present application.

Claims

1. A bicycle drive sprocket, characterized in that, The bicycle drive sprocket includes: A first disc body made of a first non-metallic material, the first disc body having a plurality of teeth on its outer periphery; A second disc body made of a second non-metallic material covers one side of the first disc body and together with the first disc body surrounds an internal space, which is annular. A support layer made of a third non-metallic material is disposed within the internal space, and the third non-metallic material is different from the first non-metallic material and the second non-metallic material.

2. The bicycle transmission sprocket according to claim 1, characterized in that, The first or second disc has a plurality of ribs formed on the side facing the interior space, the ribs extending radially along the support layer, and the interior space being divided into a plurality of compartments by the ribs.

3. The bicycle transmission sprocket according to claim 2, characterized in that, The first disk body includes a first disk surface and a first annular wall protruding from the first disk surface.

4. The bicycle transmission sprocket according to claim 3, characterized in that, The second disc body includes a second disc surface and a second annular wall protruding from the second disc surface, and the first annular wall and the second annular wall are in contact with each other.

5. The bicycle transmission sprocket according to claim 4, characterized in that, The first disc has a central axis, and the first disc surface, the second disc surface of the second disc, and at least one of the first annular walls or the second annular walls together constitute the internal space, and the distance between the first disc surface and the second disc surface gradually decreases from the first annular wall along the radial direction away from the central axis.

6. The bicycle transmission sprocket according to claim 1, characterized in that, The first non-metallic material and the second non-metallic material are fiber composite materials, and the third non-metallic material is a foamed material.

7. The bicycle transmission sprocket according to claim 6, characterized in that, The first non-metallic material and the second non-metallic material are made of the same material.

8. The bicycle transmission sprocket according to claim 1, characterized in that, The first disc and the second disc are integrally formed.

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