Bicycle fluted disc structure
By introducing upshift promotion and suppression parts into the bicycle gear plate structure, the tooth shape and groove design are optimized, and the chain switching delay and paragraph feeling during upshift are solved, and the stability and smoothness of the riding experience are improved.
Patent Information
- Application Number
- CN202420429965.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-03-06
AI Technical Summary
The existing bicycle gear wheel structure can easily lead to delayed chain switching when upshifting, creating a clear sense of paragraphs and affecting the riding experience, especially when continuously changing multiple speeds.
A bicycle gear plate structure is designed, including an upshift promotion part and an upshift suppression part. Through a specific tooth shape and groove structure, the transmission process of the chain between the gear plates is optimized, the interference and time difference during upshift is reduced, and the Stability and smoothness of upshifts.
It effectively reduces the sense of paragraph during upshift, improves the riding experience, ensures the stable transmission of the chain between the gear discs, and reduces the obvious sense of paragraph due to switching.
Smart Images
Figure CN222291923U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a bicycle, in particular to a bicycle gear disc structure. Background Art
[0002] Currently, bicycles can be changed through gears of different sizes when riding. Basically, the front and rear derailleurs are combined with gears of different sizes to change the transmission ratio of the chain between the gears. This design allows riders to adjust the speed of the pedals under different conditions to cope with different speeds and terrains.
[0003] Generally speaking, one of the most common ways to change gears is through a rear derailleur and a cassette. The rear wheel of a bicycle is usually equipped with multiple rear chainrings, each with a different number of teeth, and a rear derailleur located on the rear wheel frame. The function of the rear derailleur is to change the size of the rear chainring that the chain is connected to. With the front chainring unchanged, a larger rear chainring provides a lower gear ratio, making it easier for the rider to go uphill. A smaller rear chainring provides a higher gear ratio, which is suitable for fast and flat roads.
[0004] However, problems often arise when the chain moves on the rear sprocket. For example, when the chain shifts from a larger sprocket to a smaller sprocket, it is easy for the chain to take some time to switch from one sprocket to another during the speed change due to the structure of the sprocket. This will cause the bicycle to have a noticeable sense of segmentation when changing speeds, affecting the rider's riding feel. This situation is particularly obvious when performing continuous multi-speed shifts. Utility Model Content
[0005] The main purpose of the utility model is to provide a bicycle gear disc structure, which can effectively promote the stability of upshift operation and reduce the segmentation feeling generated during upshift.
[0006] To achieve the above-mentioned purpose, the utility model provides a bicycle chain disc structure, comprising: a chain disc body, which can be driven to rotate along a rotating axis; the chain disc body has a first side surface and a second side surface respectively on two opposite sides along the axial direction of the rotating axis, and the first side surface is closer to an adjacent smaller chain disc body than the second side surface; a plurality of meshing teeth are arranged on the outer peripheral surface of the chain disc body for a chain to be meshed; a shift-up promoting portion is arranged on the chain disc body to promote the chain to shift up from the chain disc body to the adjacent smaller chain disc body; the shift-up promoting portion has a first shift-up promoting tooth and a second shift-up promoting tooth; the first shift-up promoting tooth has a first shift-up recess formed on the first side surface of the chain disc body and recessed in a direction toward the second side surface; the second shift-up promoting tooth is circumferentially The first upshift promoting tooth is upwardly adjacent to the first upshift promoting tooth with no other tooth in between, and the second upshift promoting tooth has a second upshift recess formed on the first side surface of the sprocket body and recessed in a direction toward the second side surface; and an upshift inhibiting portion is provided on the sprocket body and adjacent to the upshift promoting portion, for inhibiting the chain from upshifting from the sprocket body to another adjacent smaller sprocket body; the upshift inhibiting portion has an upshift inhibiting tooth adjacent to a side of the second upshift promoting tooth opposite to the first upshift promoting tooth in a circumferential direction, and no other tooth is between the upshift inhibiting tooth and the second upshift promoting tooth; wherein the first upshift promoting tooth and the second upshift promoting tooth are offset in a direction toward the second side surface; the upshift inhibiting tooth is offset in a direction toward the first side surface relative to the first upshift promoting tooth and the second upshift promoting tooth.
[0007] In one embodiment, the gear disc body defines a center line along an axial width direction perpendicular to the rotation axis; the top of the first upshift promoting tooth has a first tooth top surface; the first tooth top surface and the center line form an angle that is not equal to 0, so that the distance between an end of the first upshift promoting tooth away from the second upshift promoting tooth and the first side surface is greater than the distance between an end of the first upshift promoting tooth close to the second upshift promoting tooth and the first side surface.
[0008] In one embodiment, the top of the second upshift promoting tooth has a second tooth top surface; the second tooth top surface and the center line form an angle that is not equal to 0, so that the distance between the end of the second upshift promoting tooth close to the first upshift promoting tooth and the first side surface is greater than the distance between the end of the second upshift promoting tooth away from the first upshift promoting tooth and the first side surface.
[0009] In one embodiment, the first upshift recess has a first side concave surface and a first bottom concave surface, and the first side concave surface is connected to the first bottom concave surface; the second upshift recess has a second side concave surface and a second bottom concave surface, and the second side concave surface is connected to the second bottom concave surface; wherein the first side concave surface is separated from the second side concave surface.
[0010] In one embodiment, the first side concave surface of the first upshift recess has an angle with the first side surface that is not equal to 0; the second side concave surface of the second upshift recess is substantially parallel to the first side surface, so that the first side concave surface is inclined relative to the second side concave surface.
[0011] In one embodiment, the width of the first bottom concave surface gradually decreases from one end away from the second upshift promoting tooth toward one end close to the second upshift promoting tooth, so that the root width of the first upshift promoting tooth along an axial width direction parallel to the rotating axis gradually increases from one end away from the second upshift promoting tooth toward one end close to the second upshift promoting tooth.
[0012] In one embodiment, the upshift inhibition portion further includes an upshift limiting tooth, which is adjacent to the first upshift promoting tooth on a side opposite to the second upshift promoting tooth in the circumferential direction, and there is no other tooth between the upshift limiting tooth and the first upshift promoting tooth; the upshift limiting tooth has a limiting recess formed on the second side surface of the sprocket body and is recessed in a direction toward the first side surface, so that the upshift limiting tooth is offset in a direction toward the first side surface.
[0013] In one embodiment, a tooth root width of the upshift limiting tooth along an axial width direction parallel to the rotation axis is smaller than a tooth root width of the meshing tooth along the axial width direction parallel to the rotation axis.
[0014] In one embodiment, the second upshift promoting tooth further includes a third upshift recess formed on the first side surface of the gear plate body and recessed in a direction toward the second side surface; wherein the third upshift recess is located on a side of the second upshift recess opposite to the first upshift recess and is connected to the second upshift recess.
[0015] In one embodiment, the third upshift recess is a C-shaped groove with a notch facing upward, having a third side concave surface and a third bottom concave surface; the third side concave surface is generally parallel to the first side surface, the third bottom concave surface is connected to the third side concave surface and is inclined relative to the first side surface, and the third side concave surface of the third upshift recess is separated from the second side concave surface of the second upshift recess.
[0016] Beneficial effects of the utility model: the bicycle gear disc structure of the utility model can effectively promote the stability of the upshift operation and reduce the segmentation feeling generated during the upshift. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] According to the purpose and effect of the present invention, preferred embodiments are given below and described in detail with reference to the drawings.
[0018] Figure 1 The figure is a front view of a bicycle gear disc assembly according to a preferred embodiment of the present invention.
[0019] Figure 2 It is a right side view of a bicycle chainring assembly according to a preferred embodiment of the present invention.
[0020] Figure 3 It is a front view of a larger toothed disc body according to a preferred embodiment of the present invention.
[0021] Figure 4 It is a partially enlarged front view of Figure 3.
[0022] Figure 5 It is a partially enlarged stereoscopic image of Figure 3.
[0023] Figure 6 This is a partial enlarged top view of Figure 3.
[0024] Figure 7 It is a rear view of a larger toothed disc body according to a preferred embodiment of the present invention.
[0025] Figure 8 It is a partially enlarged rear view of Figure 7.
[0026] Fig. 9 It is a partially enlarged stereoscopic image of Figure 7.
[0027] Fig.10 It is a front view of a smaller toothed disc body according to a preferred embodiment of the present invention.
[0028] Fig.11 for Fig.10 A partial enlarged front view of the .
[0029] Fig.12 for Fig.10 A partial enlarged stereogram of
[0030] 10 Base
[0031] 12 meshing teeth
[0032] 14 First side
[0033] 16 Second side
[0034] 20 Upgrade Promotion Department
[0035] 30 First upshift boost gear
[0036] 32 First tooth top surface
[0037] 34 First upshift recess
[0038] 340 First side concave surface
[0039] 342 First bottom concave surface
[0040] 36 First chamfer surface
[0041] 40 Second upshift promotion gear
[0042] 42 Second tooth top surface
[0043] 44 Second upshift recess
[0044] 440 Second side concave surface
[0045] 442 Second bottom concave
[0046] 46 Third upshift recess
[0047] 460 Third side concave
[0048] 462 Third bottom concave
[0049] 48 Second chamfer surface
[0050] 50 Upshift suppression unit
[0051] 52 Upshift inhibiting gear
[0052] 54 Upshift limit gear
[0053] 540 Limit recess
[0054] 542 Restriction side concave surface
[0055] 544 Restricted bottom concave surface
[0056] 60 Upgrade Promotion Department
[0057] 70 First upshift gear
[0058] 72 First upshift recess
[0059] 720 First side concave surface
[0060] 722 First bottom concave
[0061] 80 Second upshift gear
[0062] 82 Second upshift recess
[0063] 820 Second side concave
[0064] 822 Second bottom concave
[0065] 84 Third upshift recess
[0066] 840 Third side concave
[0067] 842 Third bottom concave
[0068] 90 Upshift inhibiting gear
[0069] A Rotation axis
[0070] B Centerline
[0071] S Bicycle Chainring Set
[0072] S1 chainring body
[0073] S2 Sprocket Body
[0074] S3 Sprocket Body
[0075] S4 Sprocket Body
[0076] S5 chainring body
[0077] S6 Sprocket Body
[0078] S7 Sprocket Body
[0079] S8 chainring body
[0080] S9 Sprocket Body
[0081] S10 chainring body
[0082] S11 Sprocket Body DETAILED DESCRIPTION
[0083] The following description with reference to the drawings is a preferred embodiment of the present invention. It should be understood that the drawings and descriptions are for illustrative purposes only and are not intended to limit the present invention. In addition, the terms "upper" and "lower", "left" and "right", "front" and "back", "first" and "second" described in the specification are used to clearly explain the relative positions between components or mechanisms, and are not intended to be limiting terms.
[0084] See also Figure 1 and Figure 2As shown, a preferred embodiment of the present invention provides a bicycle chainring set S, which is a rear chainring configuration, including a plurality of chainring bodies S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11. The chainring bodies S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11 are of different sizes and are arranged side by side from large to small along an axial direction of a rotation axis A, and each adjacent chainring body S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11 is at least a predetermined distance away from each other. The sprocket bodies S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11 are used for a chain (not shown) to engage, and can be driven by a rear transmission (not shown) to drive the chain along an upshift direction L1 from a larger sprocket body to an adjacent smaller sprocket body to complete an upshift action; or by controlling the rear transmission to drive the chain along a downshift direction L2 from a smaller sprocket body to an adjacent larger sprocket body to complete a downshift action. The structure and actuation of the rear transmission and the chain are conventional technologies, and are not the main content of the present invention, and their details are not repeated here.
[0085] In this embodiment, since the larger toothed disc bodies have substantially similar structures, one of the toothed disc bodies S11 will be used as an example for explanation, and the structures of the other toothed disc bodies can be deduced by themselves. Please refer to Figures 3 to 6, the toothed disc body S11 has an annular base 10 and a plurality of meshing teeth 12, and the meshing teeth 12 extend outward along the radial direction of the base 10 and are arranged in a ring shape on the circumference of the toothed disc body S11 for the chain to be engaged. The toothed disc body S11 has a first side surface 14 and a second side surface 16 on two opposite sides along the axial direction. The first side surface 14 faces the adjacent smaller toothed disc body S10, and the second side surface 16 faces away from the adjacent smaller toothed disc body S10. The toothed disc body S11 has at least one upshift promoting portion 20 near the circumferential edge. For example, in this embodiment, the toothed disc body S11 has three upshift promoting portions 20. Each of the upshift promoting portions 20 is used to promote the upshifting action of the chain moving from the larger sprocket body S11 to the adjacent smaller sprocket body S10.
[0086] Specifically, the upshift promoting portion 20 includes a first upshift promoting tooth 30 and a second upshift promoting tooth 40. The first upshift promoting tooth 30 and the second upshift promoting tooth 40 are adjacent to each other without another tooth therebetween. As shown in FIG. 6 , the toothed disc body S11 has a virtual center line B along the axial width center of the rotation axis A, and the center line B is located in the middle of the first side surface 14 and the second side surface 16. The top of the first upshift promoting tooth 30 has a first tooth top surface 32, and the extension direction of the first tooth top surface 32 forms an angle with the center line B that is not equal to 0, so that the distance between the end of the first upshift promoting tooth 30 away from the second upshift promoting tooth 40 and the first side surface 14 is greater than the distance between the end of the first upshift promoting tooth 30 close to the second upshift promoting tooth 40 and the first side surface 14. Thereby, the first upshift promoting tooth 30 is arranged obliquely compared to the meshing tooth 12. The first tooth top surface 32 of the first upshift promoting tooth 30 is offset relative to the center line B toward the second side surface 16. The top of the second upshift promoting tooth 40 has a second tooth top surface 42, and the extension direction of the second tooth top surface 42 forms an angle not equal to 0 with the center line B, so that the distance between the end of the second upshift promoting tooth 40 close to the first upshift promoting tooth 30 and the first side surface 14 is greater than the distance between the end of the second upshift promoting tooth 40 away from the first upshift promoting tooth 30 and the first side surface 14. In this way, the second upshift promoting tooth 40 is arranged obliquely compared to the meshing tooth 12. The second tooth top surface 42 of the second upshift promoting tooth 40 is offset relative to the center line B toward the second side surface 16. In this way, the chain can more easily complete the upshift action from the first upshift promoting tooth 30 or the second upshift promoting tooth 40.
[0087] Please refer to Figures 3 to 5As shown, the first upshift promoting tooth 30 has a first upshift recess 34, which is formed on the first side surface 14 of the sprocket body S11 and is recessed in the direction toward the second side surface 16. It is used to reduce the interference between the sprocket body S11 and the chain during the upshift of the chain from the sprocket body S11 to the adjacent smaller sprocket body S10. Specifically, the first upshift recess 34 has a first side concave surface 340 and a first bottom concave surface 342. The first side concave surface 340 is connected to the first bottom concave surface 342, and the first bottom concave surface 342 is farther away from the first tooth top surface 32 of the first upshift promoting tooth 30 than the first side concave surface 340. The first side concave surface 340 and the first side surface 14 have an angle that is not equal to 0, and the first bottom concave surface 342 is inclined relative to the first side surface 14. The width of the first bottom concave surface 342 along the axial width direction parallel to the rotation axis A gradually decreases from the end away from the second upshift promoting tooth 40 to the end close to the second upshift promoting tooth 40, so that the tooth root width of the first upshift promoting tooth 30 along the axial width direction parallel to the rotation axis A gradually increases from the end away from the second upshift promoting tooth 40 to the end close to the second upshift promoting tooth 40. Thereby, the first side concave surface 340 is also inclined from the end away from the second upshift promoting tooth 40 to the end close to the second upshift promoting tooth 40. In addition, the first upshift promoting tooth 30 further has a first chamfered surface 36. The first chamfered surface 36 is respectively connected to the first side concave surface 340 and the first tooth top surface 32, and is inclined relative to the first tooth top surface 32.
[0088] The second upshift promotion tooth 40 has a second upshift recess 44 and a third upshift recess 46, which are connected to each other, formed on the first side surface 14 of the sprocket body S11, and recessed in the direction toward the second side surface 16. The second upshift recess 44 and the third upshift recess 46 are used to reduce the interference between the sprocket body S11 and the chain during the upshift of the chain from the sprocket body S11 to the adjacent smaller sprocket body S10. Specifically, the second upshift recess 44 has a second side concave surface 440 and a second bottom concave surface 442. The second side concave surface 440 is connected to the second bottom concave surface 442, and the second bottom concave surface 442 is farther from the second tooth top surface 42 than the second side concave surface 440. The second side concave surface 440 is generally parallel to the first side surface 14, and the second bottom concave surface 442 is inclined relative to the first side surface 14. The third upshift recess 46 has a third side concave surface 460 and a third bottom concave surface 462. The third side concave surface 460 is connected to the third bottom concave surface 462 and the second side concave surface 440, and the third bottom concave surface 462 is farther from the second tooth top surface 42 of the second upshift promotion tooth 40 than the third side concave surface 460, and is connected to the second bottom concave surface 442. The third side concave surface 460 is generally parallel to the first side surface 14, and the third bottom concave surface 462 is inclined relative to the first side surface 14. In this way, the chain can be guided to the adjacent smaller toothed disc body S10 by the second side concave surface 440 and the second bottom concave surface 442 of the second upshift recess 44 or the third side concave surface 460 and the third bottom concave surface 462 of the third upshift recess 46. In addition, the second upshift promotion tooth 40 has a second chamfered surface 48. The second chamfered surface 48 is respectively connected to the second side concave surface 440 and the second tooth top surface 42 , and is inclined relative to the second tooth top surface 42 .
[0089] The first upshift recess 34 is separated from the second upshift recess 44. Specifically, the first side concave surface 340 of the first upshift recess 34 is separated from the second side concave surface 440 of the second upshift recess 44, and the first bottom concave surface 342 of the first upshift recess 34 is separated from the second bottom concave surface 442 of the second upshift recess 44. The first side concave surface 340 of the first upshift recess 34 is an inclined surface relative to the first side surface 14, and the second side concave surface 440 of the second upshift recess 44 is a plane relative to the first side surface 14. It can also be said that the first side concave surface 340 of the first upshift recess 34 is inclined relative to the second side concave surface 440 of the second upshift recess 44.
[0090] According to the above structure, the bicycle sprocket structure of the utility model has two upshift modes. The first upshift mode is that when the chain moves to the position of the first upshift promotion tooth 30 of the sprocket body S11, the rear derailleur is controlled to move the chain so that the chain enters the second upshift recess 44 along the first upshift promotion tooth 30, and then moves to the adjacent smaller sprocket body S10 to complete the upshift action. The second upshift mode is that when the chain moves to the position of the second upshift promotion tooth 40 of the sprocket body S11, the rear derailleur is controlled to move the chain so that the chain enters the third upshift recess 46 along the second upshift recess 44, and then moves to the adjacent smaller sprocket body S10 to complete the upshift action. Regardless of the first or second upshift mode, the structure of the first upshift promoting tooth 30 and the second upshift promoting tooth 40 of the upshift promoting portion 20 can promote the upshifting action of the chain from the sprocket body S11 to the adjacent smaller sprocket body S10, and can effectively reduce the sense of discontinuity caused by the interference and time difference between the chain and the sprocket body S11 during the upshift process.
[0091] In addition to the upshift promoting portion 20, the utility model also includes a corresponding upshift inhibiting portion 50 in the area adjacent to each of the upshift promoting portions 20 on the sprocket body S11. For example, in this embodiment, there are three upshift inhibiting portions 50. The upshift inhibiting portion 50 includes an upshift inhibiting tooth 52. The upshift inhibiting tooth 52 is adjacent to the second upshift promoting tooth 40, without another tooth in between, so that the second upshift promoting tooth 40 is located between the first upshift promoting tooth 30 and the upshift inhibiting tooth 52. The upshift inhibiting tooth 52 is offset relative to the first upshift promoting tooth 30 and the second upshift promoting tooth 40 toward the first side surface 14. The upshift inhibiting tooth 52 is used to inhibit the chain from performing an upshift operation. When the chain moves to the position of the upshift inhibiting teeth 52, since the upshift inhibiting teeth 52 are offset toward the first side surface 14, the main part of the chain falls on the back side of the upshift inhibiting teeth 52 and cannot be shifted by the rear derailleur, so that the chain can only perform the upshift action when it moves to the next group of the upshift facilitating parts 20. Therefore, the upshift inhibiting teeth 52 can limit the chain to perform the upshift action only at the upshift facilitating parts 20.
[0092] See also Figures 7 to 9As shown, the upshift inhibiting portion 50 further includes two upshift limiting teeth 54, and the two upshift limiting teeth 54 are adjacent to each other without another tooth therebetween. And the two upshift limiting teeth 54 are located on the side of the first upshift promoting tooth 30 relative to the second upshift promoting tooth 40. Among them, each of the two upshift limiting teeth 54 has a limiting recess 540. The two limiting recesses 540 are formed on the second side surface 16 and are recessed toward the direction of the first side surface 14. The limiting recess 540 has a limiting side concave surface 542 and a limiting bottom concave surface 544 connected to each other. In this embodiment, the limiting side concave surface 542 is generally parallel to the second side surface 16, and the limiting bottom concave surface 544 is inclined relative to the second side surface 16. In another embodiment, the limiting side concave surface and the second side surface have an angle that is not equal to 0, so that the limiting side concave surface is inclined relative to the second side surface. Due to the concave structure of the two limiting recesses 540, the root width of the second upshift limiting tooth 54 along the axial width direction parallel to the rotation axis A is smaller than the root width of the other meshing teeth 12 along the axial width direction parallel to the rotation axis A, and the second upshift inhibiting tooth 54 is offset relative to the center line B toward the first side surface 14 (such as Figure 6 As shown in FIG. 1 ). Thus, when the chain is located at the position of the second upshift limiting teeth 54, a portion of the chain abuts against the two limiting recesses 540, thereby preventing the chain from performing an upshift action from the position of the second upshift limiting teeth 54. In other words, the two upshift limiting teeth 54 and the upshift inhibiting teeth 52 can restrict the chain from performing an upshift action only when the chain moves to the position of the upshift promoting portion 20, one in front of the other.
[0093] It should be particularly noted that the upshift promotion unit of the present invention can be configured with different structural types on the larger gear plate and the smaller gear plate. Figures 10 to 12That is to say, the structure of the toothed disc body S6 in this embodiment is shown, and the structures of other smaller toothed disc bodies can be deduced by themselves. The structure of the toothed disc body S6 is similar to that of the larger toothed disc body S11, so its details are not repeated. The toothed disc body S6 also has an upshift promotion portion 60, and the upshift promotion portion 60 includes a first upshift promotion tooth 70 and a second upshift promotion tooth 80. The first upshift promotion tooth 70 has a first upshift recess 72, and the first upshift recess 72 has a first side concave surface 720 and a first bottom concave surface 722. The second upshift promotion tooth 80 has a second upshift recess 82 and a third upshift recess 84. The second upshift recess 82 has a second side concave surface 820 and a second bottom concave surface 822. The third upshift recess 84 has a third side concave surface 840 and a third bottom concave surface 842. The difference from the larger gear plate body S11 is that the first bottom concave surface 722 of the first upshift recess 72 of the gear plate body S6 is connected to the second bottom concave surface 822 of the second upshift recess 82, and the second bottom concave surface 822 of the second upshift recess 82 is connected to the third bottom concave surface 842 of the third upshift recess 84. The third upshift recess 84 is in the shape of a C-shaped groove with a notch facing upward, formed between the second upshift promoting tooth 80 and an upshift inhibiting tooth 90 of the gear plate body S6, and the third side concave surface 840 of the third upshift recess 84 is separated from the second side concave surface 820 of the second upshift recess 82.
[0094] In summary, the bicycle sprocket structure of the utility model provides two upshift modes. Through the structures of the first upshift promoting teeth and the second upshift promoting teeth of the upshift promoting part, the upshift operation of the chain from the sprocket body to the adjacent smaller sprocket body can be promoted, and the sense of blockage caused by the interference between the chain and the sprocket body during the upshift process can be reduced. On the other hand, through the structures of the rear upshift inhibiting teeth and the front upshift limiting teeth of the upshift inhibiting part, the chain can only be upshifted when the upshift promoting part is in place, effectively improving the smoothness of the upshift.
[0095] The above are preferred embodiments and design drawings of the utility model, but the preferred embodiments and design drawings are only examples and are not used to limit the scope of rights of the technology of the utility model. Any implementation with equal technical means or within the scope of rights covered by the following "patent application scope" does not depart from the scope of the utility model and is the applicant's scope of rights.
Claims
1. A bicycle gear disc structure, characterized in that: Contains: A toothed disc body, which can be driven to rotate along a rotation axis; the toothed disc body has a first side surface and a second side surface respectively on two opposite sides along the axial direction of the rotation axis, and the first side surface is adjacent to an adjacent smaller toothed disc body than the second side surface; A plurality of meshing teeth are disposed on the outer peripheral surface of the toothed disc body for meshing with a chain; an upshift promoting portion, provided on the sprocket body, for promoting the chain to be upshifted from the sprocket body to the adjacent smaller sprocket body; the upshift promoting portion has a first upshift promoting tooth and a second upshift promoting tooth; the first upshift promoting tooth has a first upshift recess, formed on the first side surface of the sprocket body and recessed in a direction toward the second side surface; the second upshift promoting tooth is adjacent to the first upshift promoting tooth in a circumferential direction without another tooth therebetween, and the second upshift promoting tooth has a second upshift recess, formed on the first side surface of the sprocket body and recessed in a direction toward the second side surface; and An upshift inhibiting portion is provided on the sprocket body and adjacent to the upshift promoting portion, for inhibiting the chain from upshifting from the sprocket body to another adjacent smaller sprocket body; the upshift inhibiting portion has an upshift inhibiting tooth, which is adjacent to the side of the second upshift promoting tooth relative to the first upshift promoting tooth in the circumferential direction, and there is no other tooth between the upshift inhibiting tooth and the second upshift promoting tooth; wherein the first upshift promoting tooth and the second upshift promoting tooth are offset in the direction of the second side surface; the upshift inhibiting tooth is offset in the direction of the first side surface relative to the first upshift promoting tooth and the second upshift promoting tooth.
2. The bicycle gear disc structure according to claim 1, characterized in that: The gear disc body defines a center line along an axial width direction perpendicular to the rotating axis; the top of the first upshift promoting tooth has a first tooth top surface; the first tooth top surface and the center line form an angle that is not equal to 0, so that the distance between the end of the first upshift promoting tooth away from the second upshift promoting tooth and the first side surface is greater than the distance between the end of the first upshift promoting tooth close to the second upshift promoting tooth and the first side surface.
3. The bicycle gear disc structure according to claim 2, characterized in that: The top of the second upshift promoting tooth has a second tooth top surface; the second tooth top surface and the center line form an angle that is not equal to 0, so that the distance between the end of the second upshift promoting tooth close to the first upshift promoting tooth and the first side surface is greater than the distance between the end of the second upshift promoting tooth away from the first upshift promoting tooth and the first side surface.
4. The bicycle gear disc structure according to claim 1, characterized in that: The first upshift recess has a first side concave surface and a first bottom concave surface, and the first side concave surface is connected to the first bottom concave surface; the second upshift recess has a second side concave surface and a second bottom concave surface, and the second side concave surface is connected to the second bottom concave surface; wherein the first side concave surface is separated from the second side concave surface.
5. The bicycle gear disc structure according to claim 4, characterized in that: The first side concave surface of the first shift-up recess and the first side surface form an angle not equal to 0; the second side concave surface of the second shift-up recess is substantially parallel to the first side surface, so that the first side concave surface is inclined relative to the second side concave surface.
6. The bicycle gear disc structure according to claim 4, characterized in that: The width of the first bottom concave surface gradually decreases from one end away from the second upshift promoting tooth toward one end close to the second upshift promoting tooth, so that the root width of the first upshift promoting tooth along an axial width direction parallel to the rotating shaft gradually increases from one end away from the second upshift promoting tooth toward one end close to the second upshift promoting tooth.
7. The bicycle gear disc structure according to claim 1, characterized in that: The upshift inhibition portion further includes an upshift limiting tooth, which is adjacent to the first upshift promoting tooth on a side opposite to the second upshift promoting tooth in the circumferential direction, and there is no other tooth between the upshift limiting tooth and the first upshift promoting tooth; the upshift limiting tooth has a limiting recess formed on the second side surface of the sprocket body and recessed in a direction toward the first side surface, so that the upshift limiting tooth is offset in a direction toward the first side surface.
8. The bicycle gear disc structure according to claim 7, characterized in that: The tooth root width of the upshift limiting tooth along an axial width direction parallel to the rotation axis is smaller than the tooth root width of the meshing tooth along the axial width direction parallel to the rotation axis.
9. The bicycle gear disc structure according to claim 4, characterized in that: The second upshift promoting tooth further includes a third upshift recess formed on the first side surface of the gear plate body and recessed in a direction toward the second side surface; wherein the third upshift recess is located on a side of the second upshift recess opposite to the first upshift recess and is connected to the second upshift recess.
10. The bicycle gear disc structure according to claim 9, characterized in that: The third upshift recess is a C-shaped groove with a notch facing upward, having a third side concave surface and a third bottom concave surface; the third side concave surface is generally parallel to the first side surface, the third bottom concave surface is connected to the third side concave surface and is inclined relative to the first side surface, and the third side concave surface of the third upshift recess is separated from the second side concave surface of the second upshift recess.