CN209467287U - Chainring - Google Patents

Abstract

A fluted disc comprises a fluted disc body, a plurality of first tooth parts, a plurality of second tooth parts and at least one groove. The first tooth portions and the second tooth portions are arranged around the fluted disc body, the second tooth portions are arranged on the first tooth portions in a staggered mode, each second tooth portion comprises a tooth flank and a tooth tip, and the tooth flanks are connected with the tooth tips and the fluted disc body. In a first direction along the axis of rotation, the tooth flank has a first surface and a second surface opposite the first surface. The at least one groove is arranged on the first surface or the second surface of at least one of the second teeth.

Description

Chainring

technical field

The utility model relates to a bicycle, in particular to a chainring of the bicycle.

Background technique

A derailleur bicycle includes, for example, a transmission system as shown in FIG. 1 . Please refer to FIG. 1 , which shows a schematic top view of a transmission system 100 for a conventional gearshift bicycle. The transmission system 100 in FIG. 1 belongs to a 1X transmission system and includes a chain 110 , a rear flywheel 120 and a front sprocket 130 . The front chainring 130 is a single chainring and is connected to a crank (not shown), while the rear flywheel 120 has a plurality of sprockets 121 stacked on each other and is connected to a rear wheel (not shown).

These sprockets 121 are different in size from each other. From Fig. 1, these sprockets 121 are arranged from top to bottom according to size, so the top sprocket 121 in Fig. 1 is the largest sprocket 121a with the largest diameter, and the bottom chain in Fig. 1 The wheel 121 is the smallest sprocket 121b with the smallest diameter. The chain 110 is engaged with the rear sprocket 120 and the front sprocket 130 , and has flexibility so that the chain 110 can bend along the directions of the rotation axis A12 of the rear flywheel 120 and the rotation axis A13 of the front sprocket 130 . In this way, the chain 110 can be selectively engaged with a sprocket 121 to achieve the function of speed change.

However, the chain 110 bent along the directions of the rotation axis A12 and the rotation axis A13 will generate lateral stress, causing friction between the rear flywheel 120 and the front sprocket 130 and the chain 110 . The greater the bending range of the chain 110 (along the directions of the rotation axis A12 and the rotation axis A13 ), the greater the above-mentioned lateral stress, thereby generating greater friction force. Once the frictional force is greater than a certain level, it will not only make a lot of noise when riding a bicycle, but also accelerate the wear of the chain 110, the rear flywheel 120 and the front chainring 130, and may even increase the separation of the chain 110 from the rear flywheel 120. Or the risk of the front chainring 130.

Utility model content

The utility model provides a toothed plate, part of which has grooves on the teeth to reduce the friction between the chain and the chain.

The toothed disc provided by the utility model is applied to a bicycle, and the toothed disc rotates with a rotating shaft as an axis. The chainring includes a chainring body, a plurality of first teeth, a plurality of second teeth and at least one groove. A plurality of first teeth and a plurality of second teeth are arranged around the chainring body, and the plurality of second teeth are arranged in a staggered manner on the plurality of first teeth, each second tooth includes a tooth belly and a tooth tip, and the tooth The belly connects the tooth tip and the tooth disc body, and along the first direction along the rotation axis, the tooth belly has a first surface and a second surface opposite to the first surface. At least one groove is disposed on at least one of the first surface or the second surface of the second tooth portion.

In an embodiment of the present invention, along the first direction, each first tooth portion has a first thickness, and each second tooth portion has a second thickness, and the second thickness is smaller than the first thickness.

In an embodiment of the present invention, the ratio of the first thickness to the second thickness may be between 1.5 and 3.

In an embodiment of the present invention, the bicycle includes a frame, and the chainring is disposed on one side of the frame, and in a first direction, the first surface of each second tooth portion is farther away from the frame than the second surface.

In one embodiment of the present invention, each groove includes a first groove disposed on the first surface of the flank of each second tooth portion and a second groove on the second surface, the first groove has The first groove bottom and a first axis passing through the first groove bottom and parallel to the rotation axis, the second groove has a second groove bottom and a second axis passing through the second groove bottom and parallel to the rotation axis.

In an embodiment of the present invention, the first axis and the second axis may be collinear.

In an embodiment of the present invention, the first axis and the second axis may not be collinear.

In one embodiment of the present invention, each first groove has a first depth relative to the first surface, each second groove has a second depth relative to the second surface, and the first depth is greater than or equal to second depth.

In an embodiment of the present invention, the ratio of the first depth to the second depth is between 1 and 2.

In an embodiment of the present invention, the first groove is separated from the chainring body by a first distance, and the second groove is separated from the chainring body by a second distance, wherein the first distance is smaller than the second distance.

In an embodiment of the present invention, the ratio of the first distance to the second distance is between 0.5 and 0.8.

In an embodiment of the present invention, at least one groove is only disposed on the first surface of the flank of at least one of the second teeth.

In an embodiment of the present invention, the depth of each groove is 5% to 10% of the second thickness.

Based on the above, since the flanks of the second teeth have grooves, when the chain of the bicycle is bent along the first direction due to gear shifting, the contact area between the sprocket and the chain can be effectively reduced to reduce friction, thereby reducing The noise generated during riding and the wear of transmission parts. In addition, since the second tooth portion only partially has a groove, its function of guiding the chain and helping the first tooth portion to mesh with the chain is not affected.

The above description is only an overview of the technical solutions of the present utility model. In order to better understand the technical means of the present utility model, it can be implemented according to the contents of the description, and in order to make the above-mentioned and other purposes, features and advantages of the present utility model better It is obvious and easy to understand. The preferred embodiments are specifically cited below, together with the accompanying drawings, and the detailed description is as follows.

Description of drawings

Fig. 1 is a schematic side view of a transmission system of a variable speed bicycle.

FIG. 2A is a three-dimensional schematic diagram of a toothed disc according to an embodiment of the present invention.

FIG. 2B is a schematic cross-sectional view of the toothed disc along line A-A of FIG. 2A according to an embodiment of the present invention.

FIG. 3A is an enlarged schematic view of a cross-section of a second tooth portion according to an embodiment of the present invention.

FIG. 3B is an enlarged schematic view of the cross-section of the second tooth portion according to another embodiment of the present invention.

FIG. 3C is an enlarged schematic view of the cross-section of the second tooth part according to another embodiment of the present invention.

Detailed ways

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following embodiments with reference to the drawings. In addition, the directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Therefore, the directional terms used are only used for illustration to help those with common knowledge in the technical field of the present invention to understand the features and functions of the present invention, and are not used to limit the present invention.

FIG. 2A is a schematic diagram of a toothed disc according to an embodiment of the present invention, and FIG. 2B is a schematic cross-sectional view of the toothed disc along line A-A of FIG. 2A . Please refer to FIG. 2A and FIG. 2B , the chainring 200 of the present invention includes a chainring body 210 , a plurality of first tooth portions 220 , a plurality of second tooth portions 230 and a plurality of grooves 233 . The chainring 200 rotates around a rotating shaft R1 as an axis.

A plurality of first tooth parts 220 and a plurality of second tooth parts 230 are respectively formed by extending from the radially outer peripheral edge of the tooth plate body 210, and the plurality of first tooth parts 220 and the plurality of second tooth parts 230 are arranged alternately and arranged on the The radial outer peripheral edge of the disc body 210 . Each second tooth part 230 includes a tooth flank 234 , and the tooth flank 234 connects a tooth tip 235 and the chainring body 210 . In the first direction d1 along the rotation axis R1 , the tooth flank 234 has a first surface 231 and a second surface 232 opposite to the first surface 231 . At least one groove 233 can be disposed on the first surface 231 or the second surface 232 of the flank 234 of at least one of the second teeth 230 . At least one groove 233 has a groove bottom 2331 furthest away from the first surface 231 or the second surface 232 . The groove 233 can be disposed on each second tooth portion 2230 , but is not limited thereto, and the groove 233 can also be disposed on part of the second tooth portion 2230 .

The chainring 200 can be applied to a bicycle (not shown), for example, it can be a front chainring of a bicycle. The chainring 200 can be matched with a chain (such as the chain 110 in FIG. 1 ) and a plurality of sprockets stacked on each other (such as the sprocket 121 in FIG. 1 ) combined with the bicycle rear sprocket (such as the rear sprocket 120 in FIG. 1 ) to drive Rear flywheel.

Each first tooth portion 220 on the chainring body 210 may have a first thickness t1 in the first direction d1, and each second tooth portion 230 may have a second thickness t2 in the first direction d1, and the second thickness t2 is the distance between the first surface 231 and the second surface 232 of each second tooth portion 230 , and the first thickness t1 is greater than the second thickness t2 . For the chainring 200 , the plurality of first tooth portions 220 are the main structure engaged with the chain, so the first thickness t1 preferably needs to correspond to the width of the chain gap, so as to prevent the chain from falling off the chainring 200 . As for the plurality of second tooth portions 230 that are staggered with the first tooth portion 220, they have the functions of guiding the chain and assisting the first tooth portion 220 to mesh with the chain. In order to reduce the friction between the chain and the chain, the second tooth portion 230 The second thickness t2 is preferably narrower than the width of the chain gap, so the second thickness t2 is smaller than the first thickness t1. For example, in this embodiment, the ratio of the first thickness t1 to the second thickness t2 may be between 1.5 and 3, but it is not limited thereto.

When the bicycle is shifted so that the chain changes the meshed chainring or the combined sprocket, the chain will bend along the first direction d1 to increase the friction between the first tooth part 220 and the second tooth part 230, and the chain bending range The larger the value, the greater the friction between the chain and the first tooth portion 220 and the second tooth portion 230 , which may generate noise and cause wear of the chain and the chainring 200 . Each second tooth portion 230 in this embodiment has a groove 233, which can effectively reduce the contact area between each second tooth portion 230 of the chainring 200 and the chain when the chain is bent along the first direction d1, thereby further Reduce friction and reduce noise, and avoid excessive wear of the chainring 200 and the chain.

In this embodiment, the bicycle to which the chainring 200 is applied may include a frame (not shown), and the chainring 200 is arranged on one side of the frame, and in the first direction d1, each second tooth portion The first surface 231 of 230 is farther away from the frame than the second surface 232 . As mentioned above, the groove 233 can be provided on the first surface 231 or the second surface 232 of the second tooth portion 230, although FIG. The groove 233 is not limited thereto, and the groove 233 can also be provided only on the first surface 231 or the second surface 232 .

When the chain is bent toward the frame in the first direction d1, the contact area between the first surface 231 of each second tooth portion 230 and the chain increases, and the groove 233 provided on the first surface 231 can reduce the first The contact area between the surface 231 and the chain is to reduce the friction force, and when the chain is bent away from the frame in the first direction d1, the contact area between the second surface 232 of each second tooth portion 230 and the chain increases, and The groove 233 disposed on the second surface 232 can reduce the contact area between the second surface 231 and the chain to reduce friction.

It can be seen that, as shown in FIG. 1 , when the chainring 200 is applied to the front chainring of the variable speed bicycle transmission system 100 , the chainring 200 is combined with the rear flywheel 120 via the chain 110 . When the chain 120 is combined with the largest sprocket 121a of the rear cassette 120, the chain 120 bends toward the frame in the first direction d1, and the chain 120 mainly rubs against the first surface 231 of each second tooth portion 230, so the groove The groove 233 may be disposed on the first surface 231 , and the groove 233 may or may not be disposed on the second surface 232 .

FIG. 3A is an enlarged schematic view of a cross-section of a second tooth portion according to an embodiment of the present invention. In this embodiment, the grooves of each second tooth portion 230a include a first groove 233a disposed on the first surface 231 of the tooth flank 234 and a second groove 233b disposed on the second surface 232 of the tooth flank 234 . The first groove 233a is provided with a first groove bottom 2331a farthest away from the first surface 231, and the first groove 233a has a first axis CP1 passing through the first groove bottom 2331a and parallel to the rotation axis R1 in FIG. 2B; The second groove 233b has a second groove bottom 2331b farthest away from the second surface 232, and the second groove 233b has a second axis CP2 passing through the second groove bottom 2331b and parallel to the rotation axis R1. In this embodiment, the first axis CP1 and the second axis CP2 may be collinear. It should be noted that although the first groove 233a shown in FIG. 3A is the same as the second groove 233b, it is not limited thereto. The first groove 233a and the second groove 233b may have different depths and ranges from each other. .

FIG. 3B is an enlarged schematic view of the cross-section of the second tooth portion according to another embodiment of the present invention. Please refer to FIG. 3B, the structure of the second tooth portion 230a of this embodiment is similar to that of the second tooth portion 230 of the embodiment of FIG. . But the main difference between the two is: in this embodiment, each first groove 233a has a first depth a1 relative to the first surface 231 to the first groove bottom 2331a, and each second groove 233b has a relative The second depth a2 from the second surface 232 to the second groove bottom 2331b is characterized in that the first depth a1 can be greater than or equal to the second depth a2, preferably, the ratio of the first depth a1 to the second depth a2 can be between 1 and 2, and each first depth a1 may account for about 5% to 10% of the second thickness t2, but is not limited thereto.

In this embodiment, the first axis CP1 and the second axis CP2 may not be collinear. In this embodiment, the range of the first groove 233 a occupying the first surface 231 a of the tooth flank 234 may be greater than the range of the second groove 233 b occupying the second surface 232 . The first groove 233a is separated from the chainring body 210 by the first distance b1, and the second groove 233b is separated from the chainring body 210 by the second distance b2. groove 233b, therefore the first distance b1 may be smaller than the second distance b2. The ratio of the first distance b1 to the second distance b2 may range from 0.5 to 0.8, but is not limited thereto.

FIG. 3C is an enlarged schematic view of the cross-section of the second tooth part according to another embodiment of the present invention. Please refer to FIG. 3C. In this embodiment, the second tooth portion 230c of this embodiment is similar in structure to the second tooth portion 230b of the embodiment in FIG. Features such as the area of the second tooth portion 230c can be equivalent to the first groove 233a in FIG. 3B , and have the same effect. However, the main difference between the two is that: in this embodiment, each second tooth portion 230c is only provided with a groove 233c on the first surface 231 . Since the first surface 231 mainly rubs against the chain, in some cases, for example, the friction between the second surface 232 and the chain is negligible, the second surface 232 may not be provided with the groove 233c.

Based on the above, since the flanks of the second teeth have grooves, when the chain of the bicycle is bent along the first direction due to gear shifting, the contact area between the sprocket and the chain can be effectively reduced to reduce friction, thereby reducing The noise generated during riding and the wear of transmission parts. In addition, since the second tooth portion only partially has a groove, its function of guiding the chain and helping the first tooth portion to mesh with the chain is not affected.

The above are only preferred embodiments of the utility model, and are not intended to limit the utility model in any form. Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any Those who are familiar with this profession, without departing from the scope of the technical solution of the present utility model, can use the methods and technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all without departing from the scope of the present utility model The content of the new technical solution, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model still belong to the scope of the technical solution of the utility model.

Claims (13)

1. A chainring, which is applied to a bicycle, and which rotates with a rotating shaft as the axis, is characterized in that it includes: A gear plate body; A plurality of first teeth and a plurality of second teeth, each of the first teeth and each of the second teeth is respectively formed by extending from the radial outer periphery of the chainring body, and arranged in a staggered manner on the On the radially outer peripheral edge of the chainring body, each of the second tooth parts respectively includes a tooth tip and a tooth flank connecting the tooth tip and the tooth disc body, and in a first direction along the rotation axis, the tooth flank has a first surface and a second surface opposite the first surface; and At least one groove is disposed on the first surface or the second surface of the flank of at least one second tooth portion. 2. The chainring according to claim 1, wherein, along the first direction, each of the first tooth portions has a first thickness, and each of the second tooth portions has a second thickness , the second thickness is smaller than the first thickness. 3 . The chainring according to claim 2 , wherein a ratio of the first thickness to the second thickness is between 1.5 and 3. 4 . 4. The chainring according to claim 1, wherein the bicycle comprises a frame, the chainring is arranged on one side of the frame, and in the first direction, each of the second teeth The first surface of the portion is farther away from the frame than the second surface. 5. The chainring according to claim 4, wherein each of the at least one groove comprises a first groove disposed on the first surface of the flank of each of the second teeth and A second groove on the second surface, the first groove has a first groove bottom and a first axis passing through the first groove bottom and parallel to the rotating shaft, the second groove has a second groove bottom , and a second axis passing through the second groove bottom and parallel to the rotation axis. 6. The chainring according to claim 5, wherein the first axis and the second axis are collinear. 7. The chainring according to claim 5, wherein the first axis and the second axis are not collinear. 8. The chainring according to claim 7, wherein the first groove is separated from the chainring body by a first distance, and the second groove is separated from the chainring body by a second distance, The first distance is smaller than the second distance. 9. The chainring according to claim 8, wherein a ratio of the first distance to the second distance is between 0.5 and 0.8. 10. The chainring according to claim 5, wherein the first groove has a first depth relative to the first surface, and the second groove has a second depth relative to the second surface. Depth, the first depth is greater than or equal to the second depth. 11. The chainring according to claim 10, wherein the ratio of the first depth to the second depth is between 1 and 2. 12. The chainring according to claim 4, wherein the at least one groove is only provided on the first surface of the flank of at least one of the second teeth. 13. The chainring according to claim 12, wherein the depth of each of the at least one groove is 5% to 10% of the second thickness.