CN221718728U - Bicycle gear structure - Google Patents

Abstract

A bicycle chainring structure, comprising: a first fluted disc having a first inner ring portion, a first connecting portion and a first outer ring tooth portion; the first inner ring part is positioned on the radial inner side of the first outer ring tooth part; the first connecting part is arranged between the first inner ring part and the first outer ring tooth part, and two ends of the first connecting part are respectively connected with the first inner ring part and the first outer ring tooth part; the outer diameter of the second fluted disc is smaller than that of the first fluted disc, the second fluted disc is arranged on one axial side of the first fluted disc, and no other fluted disc is arranged between the first fluted disc and the second fluted disc; the second fluted disc is provided with a second inner ring part, a second connecting part and a second outer ring tooth part; the second inner ring part is positioned on the radial inner side of the second outer ring tooth part; the second connecting part is arranged between the second inner ring part and the second outer ring tooth part, and two ends of the second connecting part are respectively connected with the first inner ring part and the first outer ring tooth part. The utility model can avoid the swing of the fluted disc caused by the movement of the chain, and the whole fluted disc structure is light.

Description

Bicycle gear structure

Technical Field

The utility model relates to a bicycle toothed disc, in particular to a bicycle toothed disc structure which can prevent the toothed disc from shaking when a chain moves and achieves lightness.

Background Art

In order to enable riders to adjust the transmission efficiency of bicycles according to different riding conditions, most bicycles are equipped with flywheels and transmissions. The flywheel is a structure formed by a combination of toothed discs of different sizes. The common derailleur transmission can drive the chain to move to different toothed discs by changing its own position. Due to the different sizes of the toothed discs, the transmission ratio of the front and rear toothed discs will change, causing the weight of pedaling to change, thereby achieving the effect of speed change. Common combinations include a front speed change system with a front flywheel and a front transmission; a rear speed change system with a rear flywheel and a rear transmission; or a multi-speed change system with both front and rear flywheels and front and rear transmissions.

Among them, in order to make the chain move smoothly between the toothed discs, the fixing structure between the toothed discs is very important. The conventional toothed disc fixing structure mainly adds a gasket between the toothed discs, and fixes the gasket and the toothed disc by welding, locking, screwing, etc., and uses the gasket to separate the toothed discs and stabilize the toothed disc structure. However, its disadvantage is that there is no direct contact between the toothed discs, so when the gasket and the toothed disc are not locked firmly, the chain may still shake when it moves on the toothed disc. On the other hand, adding a gasket between the toothed discs will undoubtedly increase the weight of the entire flywheel. If the number of toothed discs of the flywheel is more, more gaskets are needed, resulting in an overweight flywheel structure, which affects the weight of the entire bicycle. Therefore, how to provide a toothed disc structure for a bicycle that can solve the problem of fixing between toothed discs and the weight problem of gaskets is one of the topics that technicians and researchers in related fields need to solve urgently.

Utility Model Content

The main purpose of the utility model is to provide a bicycle gear disc structure, which can avoid the gear disc shaking caused by the movement of the chain.

Another utility model object of the utility model is to provide a bicycle gear disc structure, which can make the overall gear disc structure lightweight.

To achieve the above-mentioned purpose of the utility model, the utility model discloses a bicycle gear disc structure, comprising: a first gear disc, having a first inner ring portion, a first connecting portion and a first outer ring tooth portion; the first inner ring portion is located at the radial inner side of the first outer ring tooth portion; the first connecting portion is arranged between the first inner ring portion and the first outer ring tooth portion, and the two ends are respectively connected to the first inner ring portion and the first outer ring tooth portion; and a second gear disc, whose outer diameter is smaller than that of the first gear disc, is arranged on one axial side of the first gear disc, and the first gear disc and the second gear disc are connected. There is no other toothed disc in between; the second toothed disc has a second inner ring portion, a second connecting portion and a second outer ring tooth portion; the second inner ring portion is located radially inside the second outer ring tooth portion; the second connecting portion is arranged between the second inner ring portion and the second outer ring tooth portion, and the two ends are respectively connected to the first inner ring portion and the first outer ring tooth portion; wherein the first inner ring portion of the first toothed disc is attached to the second inner ring portion of the second toothed disc, and the first outer ring tooth portion of the first toothed disc and the second outer ring tooth portion of the second toothed disc are axially spaced a first predetermined distance apart.

In one embodiment, the first inner ring portion of the first toothed disc is substantially parallel to the first outer ring tooth portion; the first connecting portion is inclined relative to the first inner ring portion and the first outer ring tooth portion, so that the first inner ring portion is offset relative to the first outer ring tooth portion toward a direction approaching the second toothed disc; wherein the second inner ring portion, the second connecting portion and the second outer ring tooth portion of the second toothed disc are coplanar.

In one embodiment, the second inner ring portion of the second toothed disc is substantially parallel to the second outer ring tooth portion; the second connecting portion is inclined relative to the second inner ring portion and the second outer ring tooth portion, so that the second inner ring portion is offset relative to the second outer ring tooth portion in a direction close to the first toothed disc; wherein the first inner ring portion, the first connecting portion and the first outer ring tooth portion of the first toothed disc are coplanar.

In one embodiment, the second inner ring portion of the second toothed disc is substantially parallel to the second outer ring tooth portion; the second connecting portion is inclined relative to the second inner ring portion and the second outer ring tooth portion, so that the second inner ring portion is offset relative to the second outer ring tooth portion in a direction close to the first toothed disc; wherein the first inner ring portion, the first connecting portion and the first outer ring tooth portion of the first toothed disc are coplanar.

In one embodiment, an angle not equal to 0 is formed between the first connection portion and the second connection portion.

In one embodiment, it further includes a third toothed disc, whose outer diameter is smaller than that of the second toothed disc and is disposed on a side of the second toothed disc relative to the first toothed disc; the third toothed disc has a third inner ring portion, a third connecting portion and a third outer ring tooth portion; the third inner ring portion is located radially inward of the third outer ring tooth portion; the third connecting portion is disposed between the third inner ring portion and the third outer ring tooth portion, and its two ends are respectively connected to the third inner ring portion and the third outer ring tooth portion; wherein the third inner ring portion of the third toothed disc is substantially parallel to the third outer ring tooth portion; the third connecting portion is inclined relative to the third inner ring portion and the third outer ring tooth portion, so that the third inner ring portion is offset relative to the third outer ring tooth portion in a direction close to the second toothed disc; wherein the third inner ring portion of the third toothed disc is in contact with the second inner ring portion of the second toothed disc, and the third outer ring tooth portion of the third toothed disc is axially spaced a second predetermined distance from the second outer ring tooth portion of the second toothed disc.

In one embodiment, an angle not equal to 0 is formed between the second connection portion and the third connection portion.

In one embodiment, it further includes a maximum toothed disc, whose outer diameter is greater than that of the first toothed disc, and is disposed on a side of the first toothed disc opposite to the second toothed disc; the maximum toothed disc has a maximum inner ring portion, a maximum connecting portion and a maximum outer ring tooth portion; the maximum inner ring portion is located radially inward of the maximum outer ring tooth portion; the maximum connecting portion is disposed between the maximum inner ring portion and the maximum outer ring tooth portion, and its two ends are respectively connected to the maximum inner ring portion and the maximum outer ring tooth portion; wherein the maximum inner ring portion of the maximum toothed disc is substantially parallel to the maximum outer ring tooth portion; the maximum connecting portion is inclined relative to the maximum inner ring portion and the maximum outer ring tooth portion, so that the maximum inner ring portion is offset relative to the maximum outer ring tooth portion in a direction close to the first toothed disc.

In one embodiment, the largest inner ring portion of the largest toothed disc is attached to the first outer ring tooth portion of the first toothed disc, and the largest outer ring tooth portion of the largest toothed disc is axially spaced a third predetermined distance from the first outer ring tooth portion of the first toothed disc.

In one embodiment, an angle not equal to 0 is formed between the maximum connection portion of the largest toothed disc and the first outer ring tooth portion of the first toothed disc.

According to the purpose and effect of the present invention, preferred embodiments are given below and described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a first preferred embodiment of the present utility model.

FIG. 2 is a partial exploded view of the first preferred embodiment of the utility model.

FIG3 is a cross-sectional view of the first preferred embodiment of the utility model.

FIG. 4 is a schematic cross-sectional view of a second preferred embodiment of the present invention.

FIG5 is a schematic cross-sectional view of a third preferred embodiment of the present invention.

FIG6 is a schematic cross-sectional view of a fourth preferred embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view of a fifth preferred embodiment of the present invention.

DETAILED DESCRIPTION

Please refer to FIG. 1 , a preferred embodiment of the present invention provides a bicycle gear disc structure mainly including a gear disc set S. The gear disc set S is used to be installed on a bicycle (not shown) and meshed with a chain (not shown). In this embodiment, the gear disc set S is a rear gear disc set installed on a rear wheel hub (not shown) of the bicycle. In another embodiment, the gear disc set can be a front gear disc set installed on a crank of the bicycle. In this embodiment, the gear disc set S at least includes a largest gear disc S0, a first gear disc S1, a second gear disc S2 and a third gear disc S3.

Next, please refer to FIG. 2 and FIG. 3 . The first sprocket S1 includes a first inner ring portion 11, a plurality of first connecting portions 12 and a first outer ring tooth portion 13. The first inner ring portion 11 is located radially inward of the first outer ring tooth portion 13. The first connecting portions 12 are formed between the first inner ring portion 11 and the first outer ring tooth portion 13, and the two ends are respectively connected to the first inner ring portion 11 and the first outer ring tooth portion 13. The outer peripheral surface of the first outer ring tooth portion 13 has a plurality of first outer ring teeth 130 for the chain to engage. Among them, the first inner ring portion 11 and the first outer ring tooth portion 13 are generally parallel, and the plurality of first connecting portions 12 are inclined relative to the first inner ring portion 11 and the first outer ring tooth portion 13, so that the first inner ring portion 11 is offset relative to the first outer ring tooth portion 13 toward the direction of the second sprocket S2.

The second sprocket S2 is arranged on one side of the first sprocket S1, and its outer diameter is smaller than that of the first sprocket S1. The second sprocket S2 includes a second inner ring portion 21, a plurality of second connecting portions 22 and a second outer ring tooth portion 23. The second inner ring portion 21 is located radially inward of the second outer ring tooth portion 23. The plurality of second connecting portions 22 are formed between the second inner ring portion 21 and the second outer ring tooth portion 23, and the two ends are respectively connected to the second inner ring portion 21 and the second outer ring tooth portion 23. The outer peripheral surface of the second outer ring tooth portion 23 has a plurality of second outer ring teeth 230 for the chain to engage. The number of the plurality of second outer ring teeth 230 is less than the number of the plurality of first outer ring teeth 130.

The second inner ring portion 21, the plurality of second connecting portions 22 and the second outer ring tooth portion 23 of the second toothed disc S2 are coplanar, that is, the plurality of second connecting portions 22 are not inclined relative to the second inner ring portion 21 and the second outer ring tooth portion 23, and the second inner ring portion 21 is not offset relative to the second outer ring tooth portion 23. Therefore, when the second toothed disc S2 is disposed on one side of the first toothed disc S1, an angle not equal to 0 is formed between the first connecting portion 12 of the first toothed disc S1 and the second connecting portion 22 of the second toothed disc S2, so that the first inner ring portion 11 of the first toothed disc S1 is attached to the second inner ring portion 21 of the second toothed disc S2, and the first outer ring tooth portion 13 of the first toothed disc S1 and the second outer ring tooth portion 23 of the second toothed disc S2 are spaced apart from each other by a first predetermined distance.

The third sprocket S3 is arranged on a side of the second sprocket S2 away from the first sprocket S1, so that the third sprocket S3 and the first sprocket S1 are located on opposite sides of the second sprocket S2, and the outer diameter of the third sprocket S3 is smaller than the outer diameter of the second sprocket S2. The third sprocket S3 includes a third inner ring portion 31, a plurality of third connecting portions 32 and a third outer ring tooth portion 33. The third inner ring portion 31 is located radially inward of the third outer ring tooth portion 33. The plurality of third connecting portions 32 are formed between the third inner ring portion 31 and the third outer ring tooth portion 33, and the two ends are respectively connected to the third inner ring portion 31 and the third outer ring tooth portion 33. The outer peripheral surface of the third outer ring tooth portion 33 has a plurality of third outer ring teeth 330 for the chain to engage. The number of the plurality of third outer ring teeth 330 is less than the number of the plurality of second outer ring teeth 230. The third inner ring portion 31 is substantially parallel to the third outer ring tooth portion 33, and the plurality of third connecting portions 32 are inclined relative to the third inner ring portion 31 and the third outer ring tooth portion 33, so that the third inner ring portion 31 is offset relative to the third outer ring tooth portion 33 toward the direction of the second toothed disc S2. Therefore, when the third toothed disc S3 is connected to the second toothed disc S2, an angle not equal to 0 is formed between the third connecting portion 32 of the third toothed disc S3 and the second connecting portion 22 of the second toothed disc S2, so that the third inner ring portion 31 of the third toothed disc S3 is attached to the second inner ring portion 21 of the second toothed disc S2, and the third outer ring tooth portion 33 of the third toothed disc S3 and the second outer ring tooth portion 23 of the second toothed disc S2 are spaced apart from each other by a second predetermined distance.

In the present embodiment, the sprocket set 1 further includes a maximum sprocket S0, which is disposed on a side of the first sprocket S1 opposite to the third sprocket S2, so that the maximum sprocket S0 and the second sprocket S2 are located on opposite sides of the first sprocket S1, and the outer diameter of the maximum sprocket S0 is greater than the outer diameter of the first sprocket S1. The maximum sprocket S0 has a maximum inner ring portion 41, a plurality of maximum connecting portions 42 and a maximum outer tooth portion 43. The maximum inner ring portion 41 is located radially inward of the maximum outer ring portion 43. The plurality of maximum connecting portions 42 are formed between the maximum inner ring portion 41 and the maximum outer ring tooth portion 43, and the two ends are respectively connected to the maximum inner ring portion 41 and the maximum outer ring portion 43. The outer peripheral surface of the maximum outer ring tooth portion 43 has a plurality of maximum outer ring teeth 430 for the chain to mesh. The number of the plurality of maximum outer ring teeth 430 is greater than the number of the plurality of first outer ring teeth 130. The maximum inner ring portion 41 is substantially parallel to the maximum outer ring tooth portion 43, and the plurality of maximum connecting portions 42 are inclined relative to the maximum inner ring portion 41 and the maximum outer ring tooth portion 43, so that the maximum inner ring portion 41 is offset relative to the maximum outer ring tooth portion 43 toward the direction of the first toothed disc S1. When the maximum toothed disc S0 is connected to the first toothed disc S1, an angle not equal to 0 is formed between the maximum connecting portion 42 of the maximum toothed disc S0 and the first outer ring tooth portion 13 of the first toothed disc S1, so that the maximum inner ring portion 41 of the maximum toothed disc S0 is attached to the first outer ring tooth portion 13 of the first toothed disc S1, and the maximum outer ring tooth portion 33 of the maximum toothed disc S0 and the first outer ring tooth portion 13 of the first toothed disc S1 are spaced apart from each other by a third predetermined distance.

Although the above embodiment discloses the structure of the curved first toothed disc S1, the third toothed disc S3 combined with the uncurved second toothed disc S2, and the curved largest toothed disc S0 combined with the first toothed disc S1, the application of the present invention is not limited thereto.

Please refer to FIG. 4 , a second preferred embodiment of the present invention discloses a toothed disc assembly (not shown) comprising at least a first toothed disc S21 and a second toothed disc S22. The first toothed disc S21 has a first inner ring portion 211, a first connecting portion 212 and a first outer ring tooth portion 213; the first inner ring portion 211 is located radially inward of the first outer ring tooth portion 213; the first connecting portion 212 is disposed between the first inner ring portion 211 and the first outer ring tooth portion 213, and the two ends are connected to the first inner ring portion 211 and the first outer ring tooth portion 213 respectively. The second toothed disc S22 has an outer diameter smaller than that of the first toothed disc S21, and is disposed on one axial side of the first toothed disc S21, and there is no other toothed disc between the first toothed disc S21 and the second toothed disc S22; the second toothed disc S22 has a second inner ring portion 221, a second connecting portion 222, and a second outer ring tooth portion 223; the second inner ring portion 221 is located radially inside the second outer ring tooth portion 223. The second connecting portion 222 is disposed between the second inner ring portion 221 and the second outer ring tooth portion 223, and the two ends are respectively connected to the second inner ring portion 221 and the second outer ring tooth portion 223. The first inner ring portion 211 of the first toothed disc S21 is substantially parallel to the first outer ring tooth portion 213; the first connecting portion 212 is inclined relative to the first inner ring portion 211 and the first outer ring tooth portion 213, so that the first inner ring portion 211 is offset relative to the first outer ring tooth portion 213 toward the direction close to the second toothed disc S22. The second inner ring portion 221, the second connecting portion 222 and the second outer ring tooth portion 223 of the second toothed disc S22 are coplanar. Thus, when the first toothed disc S21 is connected to the second toothed disc S22, the first inner ring portion 211 of the first toothed disc S21 is attached to the second inner ring portion 221 of the second toothed disc S22, and the first outer ring tooth portion 213 of the first toothed disc S21 and the second outer ring tooth portion 223 of the second toothed disc S22 are spaced apart by a distance in the axial direction.

Please refer to FIG. 5 , a third preferred embodiment of the present invention discloses a toothed disc set (not shown) comprising at least a first toothed disc S31 and a second toothed disc S32. The first toothed disc S31 has a first inner ring portion 311, a first connecting portion 312 and a first outer ring tooth portion 313; the first inner ring portion 311 is located radially inward of the first outer ring tooth portion 313; the first connecting portion 312 is disposed between the first inner ring portion 311 and the first outer ring tooth portion 313, and the two ends of the first connecting portion 312 are respectively connected to the first inner ring portion 311 and the first outer ring tooth portion 313. The second toothed disc S32 has an outer diameter smaller than that of the first toothed disc S31, is disposed on one axial side of the first toothed disc S31, and there is no other toothed disc between the first toothed disc S31 and the second toothed disc S32. The second toothed disc S32 has a second inner ring portion 321, a second connecting portion 322 and a second outer ring tooth portion 323; the second inner ring portion 321 is located radially inward of the second outer ring tooth portion 323. The second connecting portion 322 is disposed between the second inner ring portion 321 and the second outer ring tooth portion 323, and the two ends are respectively connected to the second inner ring portion 321 and the second outer ring tooth portion 323. The first inner ring portion 311, the first connecting portion 312 and the first outer ring tooth portion 313 of the first toothed disc S31 are coplanar. The second inner ring portion 321 of the second toothed disc S32 is substantially parallel to the second outer ring tooth portion 323; the second connecting portion 322 is inclined relative to the second inner ring portion 321 and the second outer ring tooth portion 323, so that the second inner ring portion 321 is offset relative to the second outer ring tooth portion 323 toward the direction close to the first toothed disc S31. Thus, when the first toothed disc S31 is connected to the second toothed disc S32, the first inner ring portion 311 of the first toothed disc S31 fits against the second inner ring portion 321 of the second toothed disc S32, and the first outer ring tooth portion 313 of the first toothed disc S31 and the second outer ring tooth portion 323 of the second toothed disc S32 are axially spaced a distance apart.

Please refer to FIG. 6 , a fourth preferred embodiment of the present invention discloses a toothed disc set (not shown) comprising at least a first toothed disc S41 and a second toothed disc S42. The first toothed disc S41 has a first inner ring portion 411, a first connecting portion 412 and a first outer ring tooth portion 413; the first inner ring portion 411 is located radially inward of the first outer ring tooth portion 413; the first connecting portion 412 is disposed between the first inner ring portion 411 and the first outer ring tooth portion 413, and the two ends are respectively connected to the first inner ring portion 411 and the first outer ring tooth portion 413. The second toothed disc S42 has an outer diameter smaller than that of the first toothed disc S41, is disposed on one axial side of the first toothed disc S41, and there is no other toothed disc between the first toothed disc S41 and the second toothed disc S42. The second toothed disc S42 has a second inner ring portion 421, a second connecting portion 422 and a second outer ring tooth portion 423. The second inner ring portion 421 is located radially inward of the second outer ring tooth portion 423. The second connecting portion 422 is disposed between the second inner ring portion 421 and the second outer ring tooth portion 423, and the two ends are respectively connected to the second inner ring portion 421 and the second outer ring tooth portion 423. The first inner ring portion 411 and the first outer ring tooth portion 413 of the first toothed disc S41 are substantially parallel; the first connecting portion 412 is inclined relative to the first inner ring portion 411 and the first outer ring tooth portion 413, so that the first inner ring portion 411 is offset relative to the first outer ring tooth portion 413 toward the direction close to the second toothed disc S42. The second inner ring portion 421 of the second toothed disc S42 is substantially parallel to the second outer ring tooth portion 423; the second connecting portion 422 is inclined relative to the second inner ring portion 421 and the second outer ring tooth portion 423, so that the second inner ring portion 421 is offset relative to the second outer ring tooth portion 423 toward the direction close to the first toothed disc S41. Thus, when the first toothed disc S41 is connected to the second toothed disc S42, the first inner ring portion 411 of the first toothed disc S41 is attached to the second inner ring portion 421 of the second toothed disc S42, and the first outer ring tooth portion 413 of the first toothed disc S41 is spaced a distance from the second outer ring tooth portion 423 of the second toothed disc S42 in the axial direction.

Referring to FIG. 7 , a fifth preferred embodiment of the present invention discloses a toothed disc assembly (not shown) comprising at least a first toothed disc S51, a second toothed disc S52 and a third toothed disc S53. The first toothed disc S51 has a first inner ring portion 511, a first connecting portion 512 and a first outer ring tooth portion 513; the first inner ring portion 511 is located radially inward of the first outer ring tooth portion 513; the first connecting portion 512 is disposed between the first inner ring portion 511 and the first outer ring tooth portion 513, and the two ends are connected to the first inner ring portion 511 and the first outer ring tooth portion 513 respectively. The second toothed disc S52 has an outer diameter smaller than that of the first toothed disc S51, and is disposed on one axial side of the first toothed disc S51, and there is no other toothed disc between the first toothed disc S51 and the second toothed disc S52; the second toothed disc S52 has a second inner ring portion 521, a second connecting portion 522, and a second outer ring toothed portion 523; the second inner ring portion 521 is located radially inward of the second outer ring toothed portion 523. The second connecting portion 522 is disposed between the second inner ring portion 521 and the second outer ring toothed portion 523, and the two ends of the second connecting portion 522 are respectively connected to the second inner ring portion 521 and the second outer ring toothed portion 523. The third toothed disc S53 has an outer diameter smaller than that of the second toothed disc S52, and is disposed on a side of the second toothed disc S52 opposite to the first toothed disc S51, and there is no other toothed disc between the third toothed disc S53 and the second toothed disc S52. The third toothed disc S53 has a third inner ring portion 531, a third connecting portion 532 and a third outer ring tooth portion 533; the third inner ring portion 531 is located radially inward of the third outer ring tooth portion 533. The third connecting portion 532 is disposed between the third inner ring portion 531 and the third outer ring tooth portion 533, and the two ends are connected to the third inner ring portion 531 and the third outer ring tooth portion 533 respectively. The first inner ring portion 511 of the first toothed disc S51 is substantially parallel to the first outer ring tooth portion 513; the first connecting portion 512 is inclined relative to the first inner ring portion 511 and the first outer ring tooth portion 513, so that the first inner ring portion 511 is offset relative to the first outer ring tooth portion 513 toward the direction close to the second toothed disc S52. The second inner ring portion 521, the second connecting portion 522 and the second outer ring tooth portion 523 of the second toothed disc S52 are coplanar. The third inner ring portion 531 and the third outer ring tooth portion 533 of the third toothed disc S53 are substantially parallel. The third connecting portion 532 is inclined relative to the third inner ring portion 531 and the third outer ring tooth portion 533, so that the third inner ring portion 531 is offset relative to the third outer ring tooth portion 533 toward the direction close to the second toothed disc S22. Thus, when the first toothed disc S51 and the third toothed disc 53 are connected to the second toothed disc S52, the first inner ring portion 511 of the first toothed disc S51 and the third inner ring portion 531 of the third toothed disc S53 are respectively attached to the opposite sides of the second inner ring portion 221 of the second toothed disc S22, and the first outer ring tooth portion 513 of the first toothed disc S51 and the third outer ring tooth portion 533 of the third toothed disc S53 are respectively spaced a distance from the second outer ring tooth portion 523 of the second toothed disc S52 in the axial direction.

According to the above embodiments, any toothed disc structure including at least two connected toothed discs and at least one toothed disc bent relative to the other toothed disc does not deviate from the application of the present invention.

In summary, the bicycle sprocket structure provided by the utility model, through the curved connecting portion structure of the sprocket, causes the inner ring portion and the outer ring teeth of the sprocket to be offset, thereby making the outer ring teeth of adjacent sprockets adjacent to each other. In other words, the adjacent sprockets of the utility model can be directly locked together without the need for additional separation by gaskets, thereby solving the problem of the conventional sprocket structure being prone to swaying due to the movement of the chain. On the other hand, the sprocket group can maintain the distance between the sprockets without gaskets, so compared to the conventional sprocket group structure that needs to bear the additional weight of the gasket, the utility model can effectively achieve the effect of lightweighting the sprocket structure as a whole.

The above are the preferred embodiments of the utility model and the technical principles used therein. For those skilled in the art, without departing from the spirit and scope of the utility model, any obvious changes such as equivalent transformation, simple replacement, etc. based on the technical solution of the utility model shall fall within the protection scope of the utility model.

Claims (10)

1. The utility model provides a bicycle fluted disc structure which characterized in that includes:

A first fluted disc having a first inner ring portion, a first connecting portion and a first outer ring tooth portion; the first inner ring part is positioned on the radial inner side of the first outer ring tooth part; the first connecting part is arranged between the first inner ring part and the first outer ring tooth part, and two ends of the first connecting part are respectively connected with the first inner ring part and the first outer ring tooth part; and

The outer diameter of the second fluted disc is smaller than that of the first fluted disc, the second fluted disc is arranged on one axial side of the first fluted disc, and no other fluted disc is arranged between the first fluted disc and the second fluted disc; the second fluted disc is provided with a second inner ring part, a second connecting part and a second outer ring tooth part; the second inner ring part is positioned on the radial inner side of the second outer ring tooth part; the second connecting part is arranged between the second inner ring part and the second outer ring tooth part, and two ends of the second connecting part are respectively connected with the first inner ring part and the first outer ring tooth part;

the first inner ring part of the first fluted disc is attached to the second inner ring part of the second fluted disc, and the first outer ring tooth part of the first fluted disc and the second outer ring tooth part of the second fluted disc are axially separated by a first preset distance.

2. The bicycle chainring structure of claim 1, wherein the first inner ring portion and the first outer ring portion of the first chainring are substantially parallel; the first connecting part inclines relative to the first inner ring part and the first outer ring tooth part, so that the first inner ring part is offset relative to the first outer ring tooth part in a direction approaching to the second fluted disc; wherein the second inner ring portion, the second connecting portion and the second outer ring tooth portion of the second toothed disc are coplanar.

3. The bicycle chainring structure of claim 1, wherein the second inner ring portion of the second chainring is substantially parallel to the second outer ring portion; the second connecting part is inclined relative to the second inner ring part and the second outer ring tooth part, so that the second inner ring part is offset relative to the second outer ring tooth part in a direction approaching to the first fluted disc; wherein the first inner ring portion, the first connecting portion and the first outer ring tooth portion of the first toothed disc are coplanar.

4. The bicycle chainring structure of claim 1, wherein the first inner ring portion and the first outer ring portion of the first chainring are substantially parallel; the first connecting part inclines relative to the first inner ring part and the first outer ring tooth part, so that the first inner ring part is offset relative to the first outer ring tooth part in a direction approaching to the second fluted disc; wherein the second inner ring portion and the second outer ring portion of the second toothed disc are substantially parallel; the second connecting part is inclined relative to the second inner ring part and the second outer ring tooth part, so that the second inner ring part is offset towards the direction approaching to the first fluted disc relative to the second outer ring tooth part.

5. The bicycle chainring structure of claim 1, wherein an included angle between the first connecting portion and the second connecting portion is not equal to 0.

6. The bicycle chainring structure of claim 2, further comprising a third chainring having an outer diameter smaller than the second chainring and disposed on a side of the second chainring opposite to the first chainring; the third fluted disc is provided with a third inner ring part, a third connecting part and a third outer ring tooth part; the third inner ring part is positioned on the radial inner side of the third outer ring tooth part; the third connecting part is arranged between the third inner ring part and the third outer ring tooth part, and two ends of the third connecting part are respectively connected with the third inner ring part and the third outer ring tooth part; wherein the third inner ring portion and the third outer ring portion of the third toothed disc are approximately parallel; the third connecting part inclines relative to the third inner ring part and the third outer ring tooth part, so that the third inner ring part is offset towards the direction approaching the second fluted disc relative to the third outer ring tooth part; the third inner ring part of the third fluted disc is attached to the second inner ring part of the second fluted disc, and the third outer ring tooth part of the third fluted disc and the second outer ring tooth part of the second fluted disc are axially separated by a second preset distance.

7. The bicycle chainring structure of claim 6, wherein an included angle between the second connecting portion and the third connecting portion is not equal to 0.

8. The bicycle chainring structure of claim 6, further comprising a largest chainring having an outer diameter larger than the first chainring and disposed on a side of the first chainring opposite the second chainring; the maximum fluted disc is provided with a maximum inner ring part, a maximum connecting part and a maximum outer ring tooth part; the maximum inner ring part is positioned on the radial inner side of the maximum outer ring tooth part; the maximum connecting part is arranged between the maximum inner ring part and the maximum outer ring tooth part, and two ends of the maximum connecting part are respectively connected with the maximum inner ring part and the maximum outer ring tooth part; wherein the maximum inner ring portion and the maximum outer ring portion of the maximum toothed disc are approximately parallel; the maximum connecting part is inclined relative to the maximum inner ring part and the maximum outer ring tooth part, so that the maximum inner ring part is offset relative to the maximum outer ring tooth part in a direction approaching the first fluted disc.

9. The bicycle chainring structure of claim 8, wherein the largest inner ring portion of the largest chainring is attached to the first outer ring portion of the first chainring, and the largest outer ring portion of the largest chainring is axially spaced from the first outer ring portion of the first chainring by a third predetermined distance.

10. The bicycle chainring structure of claim 8, wherein the maximum connection portion of the maximum chainring forms an included angle with the first outer ring gear portion of the first chainring that is not equal to 0.