Transmission fluted disc

Abstract

The utility model provides a transmission fluted disc. The transmission fluted disc comprises a fluted disc body, an annular shell and an upper chain protruding block. The fluted disc body is made of a first non-metal material, and the radial outer edge of the fluted disc body is provided with a plurality of chain teeth and mounting holes. The annular housing is made of a second non-metal material. The annular shell covers one side of the fluted disc body, the annular shell and the fluted disc body jointly define an inner space, and the inner space surrounds the axis of the fluted disc body. And the upper chain bump is arranged in the mounting hole. One of the fluted disc body and the annular shell forms a rib in the internal space, the rib extends from the axis to the radial direction of the upper chain protruding block, and the rib abuts against the other one of the fluted disc body and the annular shell.

Description

Technical Field

[0001] This application relates to a chainring, and more particularly to a transmission chainring in a bicycle that is combined with a chain to transmit power. Background Technology

[0002] Since the invention of the bicycle, its design has undergone many changes, including the development of a gear system. Because the weight of a bicycle creates an unnecessary energy burden for the rider, reducing the weight of the bicycle while maintaining the gear system has become an important issue.

[0003] When reducing bicycle weight, besides changing the type of material used in the bicycle frame, the weight can also be reduced by improving the frame structure. Due to the different properties of materials, the original frame structure design may not provide sufficient strength after changing the type of material. Therefore, corresponding to the change in frame material, the design of the high-stress parts of the frame structure, namely the gear mechanism, should also be modified accordingly. Utility Model Content

[0004] The technical problem to be solved by this application is to provide a transmission gear disc that has the advantages of being lightweight and having high structural strength.

[0005] To achieve the above advantages, one embodiment of this application provides a transmission gear disc, comprising: a gear disc body made of a first non-metallic material, wherein a plurality of chain teeth and at least one mounting hole are provided on the radial outer edge of the gear disc body; an annular shell made of a second non-metallic material, the annular shell covering one side of the gear disc body and together with the gear disc body surrounding an internal space, the internal space surrounding the axis of the gear disc body; an upper chain protrusion disposed in at least one mounting hole of the gear disc body; and one of the gear disc body and the annular shell forming a rib in the internal space, the rib extending radially from the axis toward the upper chain protrusion, and the rib abutting against the other of the gear disc body and the annular shell.

[0006] In one embodiment, the aforementioned annular housing has a second disk wall relative to the toothed disk body, the second disk wall extending obliquely from a side close to the axis toward a direction away from the axis and gradually approaching the toothed disk body.

[0007] In one embodiment, the second disk wall described above has a stepped structure and has a plurality of first ring portions, each of which extends obliquely from the side close to the axis toward the direction away from the axis and gradually approaches the toothed disk body.

[0008] In one embodiment, the second disc wall further has a second ring portion, which is connected between two adjacent first ring portions and is not parallel to the first ring portions.

[0009] In one embodiment, one of the first ring portions described above is located at the outer edge of the annular shell.

[0010] In one embodiment, the outer edge of the annular shell has a notch, through which the upper chain protrusion passes.

[0011] In one embodiment, the aforementioned ribs extend from the toothed disc body and the annular shell respectively and abut against each other.

[0012] In one embodiment, the first non-metallic material and the second non-metallic material are the same material.

[0013] In one embodiment, the first non-metallic material and the second non-metallic material are different materials.

[0014] In one embodiment, the material of the aforementioned upper chain bump is a non-metallic material.

[0015] As explained above, the transmission gear in this embodiment reduces weight by providing an internal space between the gear body and the annular housing. Furthermore, because ribs extending radially toward the upper chain protrusion are provided within the space, the transmission gear is less prone to deformation when the chain presses against the upper chain protrusion during gear shifting, resulting in a self-propelled gear that is both lightweight and structurally strong.

[0016] The other effects and embodiments of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an exploded view of the transmission gear plate in one embodiment of this application;

[0019] Figure 2 for Figure 1 A schematic diagram of the central transmission gear disc assembly;

[0020] Figure 3 for Figure 1 A schematic cross-sectional view of section AA in the middle;

[0021] Figure 4 for Figure 1 A cross-sectional schematic diagram of section BB in the middle section;

[0022] Figure 5 for Figure 1 A schematic diagram of the back of the annular shell.

[0023] Symbol Explanation

[0024] 100: Transmission gear 1: Gear body

[0025] 1a: Tooth 11: First disc wall

[0026] 110: First plate 111: Groove

[0027] 112: Rib; 113: Mounting hole

[0028] 12: First annular wall; 13: Fixing part

[0029] 2: Annular shell 21: Second disk wall

[0030] 210: Second plate 211: Rib

[0031] 211a: Gap; 212: First ring section

[0032] 213: Second ring portion; 22: Second annular wall

[0033] 3: Upper winding protrusion 4: Claw part

[0034] 41: Connecting hole 5: Secondary gear plate

[0035] S: Internal space; A: Axis Detailed Implementation

[0036] 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.

[0037] Figure 1 This is an exploded view of the transmission gear plate in one embodiment of this application. Figure 2 for Figure 1 A schematic diagram of the central transmission gear plate assembly. Figure 3 for Figure 1 A schematic diagram of the cross-section of section AA. Figure 4 for Figure 1 A cross-sectional schematic diagram of section BB in the middle. Figure 5 for Figure 1 A schematic diagram of the back of the annular shell.

[0038] like Figures 1 to 5 As shown, in one embodiment of this application, the transmission gear 100 includes: a gear body 1, an annular housing 2, and a chain-upping protrusion 3. The gear body 1 is made of a first non-metallic material, and a plurality of chain teeth 1a and mounting holes 113 are provided on the radial outer edge of the gear body 1. The annular housing 2 is made of a second non-metallic material, and the annular housing 2 covers one side of the gear body 1, and together with the gear body 1, surrounds an internal space S, which surrounds the axis A of the gear body 1. The chain-upping protrusion 3 is provided in the mounting hole 113. One of the gear body 1 and the annular housing 2 forms a rib in the internal space S (see...). Figure 3 Ribs 112 and 211 extend radially from axis A toward upper chain protrusion 3 and abut against one of the toothed disc body 1 and annular housing 2.

[0039] In this embodiment, the axis of the transmission gear 100 and the axis of the annular housing 2 also coincide with axis A.

[0040] In this embodiment, the winding bump 3 is, for example, a pin inserted into the toothed disc body 1 and detachable from it. The shape and material of the winding bump 3 are not particularly limited. Specifically, the main function of the winding bump 3 is to provide an additional attachment point between the original and target toothed discs when the chain moves between them, thus facilitating a smooth winding process. Therefore, it only needs to protrude from the toothed disc surface and have sufficient axial length. The material of the winding bump 3 is, for example, metal, but not limited to it. It can also be a non-metallic material such as fiber composite materials or polymer materials that meet the requirements for wear resistance and strength. In similar... Figure 1 In the embodiment with multiple up-bumps 3, the shapes of the different up-bumps 3 can be different.

[0041] In this embodiment, the transmission sprocket 100 further includes, for example, a claw 4, which is used for engaging with, for example, a bicycle crank (not shown) and a secondary sprocket 5 (see figure). Figure 2 Connection. The claw 4 may be cross-shaped, but there are no particular limitations. The center of the claw 4 is located on the axle A and has a connection hole 41 suitable for connection with the bicycle crank. There are no particular limitations on the material of the claw 4. Common materials include steel, iron, fiber composites, polymer composites, aluminum alloys, and titanium alloys, and appropriate materials can be selected according to the requirements of the usage environment.

[0042] like Figure 2 As shown, the secondary gear 5 is, for example, a gear with a diameter smaller than that of the drive gear 100. When the secondary gear 5 is combined with the drive gear 100, the secondary gear 5 is, for example, mounted on the side of the drive gear 100 near the bicycle frame (not shown). The material of the secondary gear 5 can be selected according to requirements. In an embodiment not shown, the structure of the secondary gear 5 can be similar to that of the drive gear 100.

[0043] like Figures 1 to 3 As shown, the sprocket body 1 is made of a first non-metallic material. This first non-metallic material can be integrally molded from carbon fiber, but is not limited to this; it can also be other types of fiber composites and polymer materials, or other materials that meet the strength requirements. When the drive sprocket 100 is combined with the bicycle frame, the sprocket body 1 is, for example, located on the side of the drive sprocket 100 away from the bicycle frame. The sprocket 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.

[0044] like Figure 1 and Figure 3 As shown, continuing from the above, in this embodiment, the first disc wall 11 has a first disc surface 110 on the side facing the annular housing 2 (which in this embodiment is also the side of the disc body 1 facing the bicycle frame). The normal direction of the first disc surface 110 is, for example, parallel to the axis A.

[0045] In this embodiment, the first disk wall 11 has a plurality of grooves 111 with openings on the first disk surface 110, and ribs 112 are formed between each groove 111. The first disk surface 110 is, for example, the bottom surface of the groove 111.

[0046] Continuing from the above, the first disc wall 11 also has a mounting hole 113 suitable for assembly with the upper chain protrusion 3. The mounting hole 113 is located, for example, on the extension line of the rib 112 and next to the groove 111, and closer to the axis A than the chain tooth 1a. The chain tooth 1a of the gear disc body 1 is located, for example, on the outer periphery of the first disc wall 11.

[0047] In this embodiment, the first annular wall 12 is located at the inner periphery of the first disk wall 11. The first annular wall 12 protrudes toward the annular housing 2, for example, from the surface of the first disk surface 110 along an extension direction parallel to the axis A of the transmission gear disk 100. The outer wall surface of the first annular wall 12 (the wall surface of the first annular wall 12 facing away from the axis A) is, for example, perpendicular to the first disk surface 110, but is not limited thereto.

[0048] 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 axis A) toward the axis A of the transmission gear disk 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.

[0049] When the gear disc body 1 and the claw part 4 are assembled, each end point of the claw part 4 is connected to the fixing part 13 of the gear disc body 1. The connection method between the fixing part 13 and the claw part 4 is not limited, such as by fastener screwing or by adhesive bonding, and can be set according to requirements. The shape of the gear disc body 1 can be set according to requirements. In an embodiment not shown in the figure, the gear disc body 1 and the claw part 4 can be integrally formed.

[0050] like Figures 1 to 5 As shown, specifically, the annular shell 2 is made of a second non-metallic material. This second non-metallic material can be integrally molded from carbon fiber, but is not limited to this; it can also be other fiber composite materials or polymer materials that meet strength requirements. Furthermore, depending on the usage environment, the first and second non-metallic materials can be the same material, and different materials can be selected according to different strength requirements. In this embodiment, the outer diameter and inner diameter of the annular shell 2 are, for example, smaller than the outer diameter and inner diameter of the gear disc body 1, respectively. When installed, the annular shell 2 is, for example, located on the side of the drive gear disc 100 close to the bicycle frame relative to the gear disc body 1. The annular shell 2 is, for example, annular in shape. The annular shell 2 includes a second annular disc wall 21 and a second annular wall 22 located at the inner edge of the annular shell 2.

[0051] like Figures 1 to 5 As shown, in this embodiment, the second disk wall 21 has a second disk surface 210 on the side facing the disk body 1. The second disk wall 21 extends obliquely from the side of the second annular wall 22 away from the disk body 1, gradually approaching the disk body 1 from the side near the axis A. The size of the second disk wall 21, for example, is such that when the disk body 1 and the annular housing 2 are combined, it can completely cover the size of each groove 111 on the disk body 1.

[0052] like Figure 2 and Figure 3 As shown, in this embodiment, the second disk wall 21 has, for example, a stepped structure, with a stepped surface formed on one side opposite the second disk surface 210. The stepped structure of the second disk wall 21 has a plurality of first ring portions 212 and a plurality of second ring portions 213. For example, there are three first ring portions 212, and one of the first ring portions 212 is located at the outer edge of the annular housing 2. Each first ring portion 212 extends obliquely from the side near the axis A toward the direction away from the axis A and gradually approaches the side of the annular housing 2 near the toothed disk body 1. The inclination angles of the different first ring portions 212 can be different. For example, in this embodiment, the inclination angle of the first ring portion 212 located at the outer edge of the annular housing 2 is greater than the inclination angles of the other two first ring portions 212.

[0053] like Figure 2 and Figure 3As shown, there are, for example, two second ring portions 213. Each second ring portion 213 is connected between two adjacent first ring portions 212, and the extending direction of the second ring portion 213 is not parallel to the extending direction of the first ring portion 212. In this embodiment, on one side surface opposite to the second disc surface 210, the surfaces of the different second ring portions 213 are, for example, parallel to each other and facing the extending direction of the axis A, but are not limited thereto. With this configuration, when the bicycle with the drive chain 100 is shifting gears, the chain (not shown) can gradually move along the surface of the second disc wall 21 away from the disc body 1 in the extending direction of the axis A.

[0054] Since this application does not limit the shape of the second disk wall 21, in other embodiments of this application, the stepped structure can be replaced with a continuous curved surface structure or an inclined structure. This allows the chain (not shown) to move gradually along the second disk wall 21 in the extension direction of axis A.

[0055] like Figure 3 As shown, the second annular wall 22 extends, for example, from the inner edge of the second disk surface 210 along an extension direction parallel to the axis A of the transmission gear disk 100 toward the side where the gear disk body 1 is located, and is adapted to contact the first annular wall 12 when the annular housing 2 is combined with the gear disk body 1.

[0056] like Figure 3 As shown, during assembly, the first annular wall 12 and the second annular wall 22 are in contact with each other, and the portion of the first disk wall 11 near its outer periphery is also in contact with the outer periphery of the second disk wall 21. Because in this embodiment, the inner wall surface of the second annular wall 22 (the wall surface of the second annular wall 22 facing the side closest to axis A) is attached to the outer wall surface of the first annular wall 12, the internal space S is jointly formed by the first disk surface 110, the second disk surface 210, and the second annular wall 22, but this can be configured according to requirements. Figure 3 As can be seen from the diagram, the distance between the first disk surface 110 and the second disk surface 210 gradually decreases from the first annular wall 12 in the radial direction away from the axis A.

[0057] like Figure 3 As shown, the detailed connection method between the gear disc body 1 and the annular housing 2 can be set according to requirements. For example, the contact parts of the gear disc body 1 and the annular housing 2 can be melted by heating and joined together, or an adhesive can be provided between the two.

[0058] Since there are no particular restrictions on the size relationship between the annular shell 2 and the toothed disc body 1, 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, based on the relative size relationship between the first annular wall 12 and the second annular wall 22.

[0059] like Figure 2 , Figure 4 and Figure 5 As shown, in this embodiment, the outer edge of the annular housing 2 has a notch 211a that penetrates the annular housing 2 along the direction parallel to the axis A. When assembling the components, the upper chain protrusion 3 passes through the notch 211a and is detachably inserted into the mounting hole 113 of the gear disc body 1. With this structure, after assembly, the upper chain protrusion 3 protrudes from the surface of the outermost first ring portion 212, which is suitable for assisting the chain and chain teeth 1a in engagement during speed change.

[0060] The size of the up-bump 3 can be set according to requirements. For example, such as Figure 2 and Figure 4 As shown, in this embodiment, when the upper chain protrusion 3 is disposed on the toothed disc body 1, in the direction parallel to the extension direction of the axis A, the upper chain protrusion 3 not only protrudes from the surface of the first ring portion 212 located on the outer edge of the annular housing 2, but also protrudes from the surface of the second ring portion 213 located near the outer edge of the annular housing 2.

[0061] like Figure 2 and Figure 4 In this embodiment, because the upper chain protrusion 3 has a mushroom-shaped shape, in the radial direction of the transmission gear disk 100, the upper chain protrusion 3 not only partially covers the surface of the first ring portion 212 at the outermost edge of the annular housing 2, but also covers the surface adjacent to the second ring portion 213, and does not cover the surface of the other first ring portions 212.

[0062] like Figure 3 and Figure 5 As shown, in this embodiment, the gear disk body 1 and the annular housing 2 each form opposing ribs 112 and 211 on the side facing the internal space S. These ribs (ribs 112 and 211) extend radially along the transmission gear disk 100 and abut against each other when the gear disk body 1 and the annular housing 2 are connected. The internal space S is divided into multiple sub-chambers by these ribs (ribs 112 and 211).

[0063] Regarding the ribs in the internal space S, specifically, as follows: Figure 1 As shown, the rib 112 of the toothed disc body 1 is formed, for example, between two grooves 111 of the first disc wall 11, and the top surface of the rib 112 is aligned, for example, with the first disc surface 110. Figure 5 As shown, the ribs 211 of the annular shell 2 are formed, for example, between the second disk surface 210 and the second annular wall surface, and are opposite to each other, for example, corresponding to the positions of the ribs 112 of the toothed disk body 1.

[0064] It should be understood that the detailed shapes of ribs 112 and 211 can be set according to requirements. For example, in an embodiment not shown in the figures, the toothed disc body 1 may not have grooves 111 and may not have ribs 112, so that the ribs 211 of the annular housing 2 directly abut against the first disc surface 110. In another embodiment, the annular housing 2 may not have ribs 211, and the ribs 112 of the toothed disc body 1 may protrude from the first disc surface 110 and abut against the second disc surface 210 when the toothed disc body 1 and the annular housing 2 are combined.

[0065] As explained above, the transmission sprocket of this application reduces weight by providing an internal space between the sprocket body and the annular housing. Furthermore, because ribs extending radially toward the location of the upper chain lug are provided in the space, the transmission sprocket is less likely to deform when the chain presses against the upper chain lug during gear shifting. This gives the bicycle sprocket the advantages of being lightweight and having high structural strength.

[0066] Furthermore, because the ring-shaped housing has a stepped structure, the chain can move gradually along the surface of the ring-shaped housing during speed change, and smoothly engage with the teeth of the gear disc body after passing the upper chain protrusion.

[0067] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of this application, and are not intended to limit the implementation methods of the technology of this application in any way. Any person skilled in the art may make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in this application, but these should still be regarded as the technology or embodiments that are substantially the same as those of this application.

Claims

1. A transmission gear disc, characterized in that, The transmission gear disc includes: A toothed disc body is made of a first non-metallic material, and the radial outer edge of the toothed disc body is provided with a plurality of chain teeth and at least one mounting hole; An annular shell, made of a second non-metallic material, covers one side of the toothed disc body and together with the toothed disc body surrounds an internal space, the internal space surrounding an axis of the toothed disc body; An up-chain protrusion is provided in at least one mounting hole; One of the toothed disc body and the annular housing forms a rib in the internal space. The rib extends radially from the axis toward the upper chain protrusion and abuts against the other of the toothed disc body and the annular housing.

2. The transmission gear disc according to claim 1, characterized in that, The annular housing has a second disk wall relative to the toothed disk body, the second disk wall extending obliquely from the side close to the axis toward a direction away from the axis and gradually approaching the toothed disk body.

3. The transmission gear disc according to claim 2, characterized in that, The second disc wall has a stepped structure and has multiple first ring portions, each of which extends obliquely from the side close to the axis toward a direction away from the axis and gradually approaches the toothed disc body.

4. The transmission gear disc according to claim 3, characterized in that, The second disc wall further has at least one second ring portion, which is connected between two adjacent first ring portions and is not parallel to the first ring portions.

5. The transmission gear disc according to claim 3, characterized in that, One of these first rings is located at the outer edge of the annular shell.

6. The transmission gear disc according to claim 1, characterized in that, The outer edge of the annular shell has at least one notch through which the upper chain protrusion passes.

7. The transmission gear disc according to claim 1, characterized in that, The ribs extend from the toothed disc body and the annular shell respectively and abut against each other.

8. The transmission gear disc according to claim 1, characterized in that, The first non-metallic material and the second non-metallic material are the same material.

9. The transmission gear disc according to claim 1, characterized in that, The first non-metallic material and the second non-metallic material are different materials.

10. The transmission gear disc according to claim 1, characterized in that, The material of the winding bump is non-metallic.

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