Novel fluted disc adaptive to 13-speed bicycle

Abstract

The novel fluted disc matched with the 13-speed bicycle comprises a fluted disc body, a plurality of thick tooth pieces and thin tooth pieces which are sequentially arranged in a staggered mode are arranged on the outer edge of the fluted disc body in the circumferential direction, the height of tooth tops of the thick tooth pieces and the thin tooth pieces is larger than that of chain rollers, chamfering treatment is conducted on the four side edges of each thick tooth piece, and chamfering treatment is conducted on the four side edges of each thin tooth piece. And the tooth tips of the thick tooth sheets and the tooth tips of the thin tooth sheets are provided with fillet structures. In the utility model, as the chamfers of 155 degrees are arranged at the four side edges of the rear tooth sheet, the rear tooth sheet cannot interfere with an inner chain sheet of a chain when the rear tooth sheet is matched with the 13-speed chain for use, so that the problems that the chain is not smoothly guided in, is blocked, even is stuck and the like can be avoided. And the tooth tips of the thick tooth sheets and the thin tooth sheets are higher than the height of the chain rollers, so that the hidden dangers of chain jumping and chain falling of the chain rollers can be completely eradicated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle accessory technical field, concretely relates to a novel sprocket adapted to 13 speed bicycle. BACKGROUND

[0002] Bicycle is also called as footboard or bicycle, and is a kind of green environmental protection traffic tool, and rider drives wheel rotation to move by treading pedal.The bicycle with speed change system appears with the development of technology, i.e.speed change bicycle.The speed of this bicycle is changed by changing the cooperation of chain and different front and rear size sprocket, so as to cope with different road sections and road conditions.The speed of speed change bicycle can be judged according to the number of flywheel and toothed disc and the number of speed changer.The more the number of speed of speed change bicycle is, the wider the potential speed range of bicycle is, and the better the riding experience of the bicycle is.The specific speed is flywheel number x toothed disc number.

[0003] However, the increase of speed will cause the tooth spacing of flywheel to be reduced, and correspondingly, the chain of bicycle becomes thinner, so in principle, the sprocket of high speed can be matched with the chain of low speed, but the sprocket of low speed cannot be matched with the chain of high speed, i.e.the sprocket of 11 and 12 speed cannot be matched with the chain of 13 speed, and problems such as chain introduction disorder, jam and even jamming occur, so the prior art has limitations. CONTENT OF UTILITY MODEL

[0004] The utility model is carried out in order to solve the above problem, and aims at providing a novel sprocket adapted to 13 speed bicycle.

[0005] The utility model provides a novel sprocket adapted to 13 speed bicycle, including sprocket body, the outer edge of sprocket body is equipped with a plurality of thick tooth piece and thin tooth piece that are sequentially staggered along the circumference, the tooth tip height of thick tooth piece and thin tooth piece is higher than the height of chain roller, four side edges of thick tooth piece are all chamfered, and extend to the tooth tip of thick tooth piece, and the tooth tip of thin tooth piece is equipped with round angle structure;

[0006] Among them, the width of thick tooth piece is 2.75mm ± 0.1mm,

[0007] The thickness of thin tooth piece is 1.55mm ± 0.1mm,

[0008] The chamfer angle of upper side edge of thick tooth piece is 155 °.

[0009] In the novel sprocket adapted to 13 speed bicycle provided by the utility model, the tooth tip height difference between thick tooth piece and thin tooth piece and the height of chain roller can be 0.3mm.

[0010] The novel chainring adapted for a 13-speed bicycle provided by the present invention may further have the following feature: a mounting hole is provided on the chainring body and at the center thereof.

[0011] The novel chainring adapted for a 13-speed bicycle provided by the present invention may also have the following characteristics: the cross section of the thick chainring is octagonal, and the cross section of the thin chainring is rectangular.

[0012] Functions and effects of utility models

[0013] The new chainring for 13-speed bicycles according to the present invention features 155° chamfers on the four side edges of the rear sprockets. This prevents interference with the inner chainrings when used with a 13-speed chain, thereby preventing problems such as chain slippage, jamming, and even chain jamming. Furthermore, because the tooth tips of the thick and thin sprockets are higher than the height of the chain rollers, the potential for chain skipping and chain derailment is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 yes Figure 1 A magnified view of point A in the figure;

[0016] Figure 3 It is a partial cross-sectional view of the utility model and a 13-speed chain.

[0017] Description of reference numerals:

[0018] 1. Sprocket body; 11. Thick sprocket; 12. Thin sprocket; 13. Mounting hole; 2. Chain; 21. Inner chainring; 22. Outer chainring;

[0019] 23. Chain roller. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is described in detail in the following embodiments with reference to the accompanying drawings.

[0021] Example

[0022] Figure 1 It is a structural diagram of the utility model. Figure 2 yes Figure 1 A in the enlarged view, Figure 3 It is a partial cross-sectional view of the utility model and a 13-speed chain.

[0023] like Figures 1 to 3As shown, this embodiment provides a new type of chainring adapted for a 13-speed bicycle, comprising: a chainring body 1.

[0024] like Figure 1 and Figure 2 As shown, the outer edge of the sprocket body 1 is circumferentially provided with a plurality of thick sprockets 11 and thin sprockets 12, arranged alternately in sequence. The tooth tips of the thick sprockets 11 and thin sprockets 12 are higher than the height of the chain roller 23. In this embodiment, the outer diameter of the tooth tip circles of the thick sprockets 11 and thin sprockets 12 is calculated as D = d + (d1 / 2) + K, where d is the pitch circle diameter, d1 is the diameter of the chain roller 23, and K is the coefficient value (unit: mm). In this embodiment, K is set to 0.3, resulting in a 0.3mm difference in height between the tooth tips of the thick sprockets 11 and thin sprockets 12 and the height of the chain roller 23. This reduces the tooth tip insertion width, enhancing the compatibility between the sprockets and the chain 2 during chain insertion or removal. This allows the chain 2 to transition more smoothly from the insertion state to the load transmission state, and vice versa, during riding. This fundamentally eliminates the risk of thick tooth tips getting stuck in the chain roller 23 and causing chain skipping. The tooth tip is higher than the chain roller 23, which can more effectively prevent the chain from falling off (even in the case of chain jumping).

[0025] In this embodiment, a mounting hole 13 is provided on the chainring body 1 and located at the center thereof, so that the chainring body 1 can be mounted on the crank.

[0026] like Figure 1 and Figure 2 As shown, the four side edges of the thick sprocket 11 are chamfered and extend to the tooth tips of the thick sprocket 11. The tooth tips of the thin sprocket 12 are rounded. In this embodiment, the width of the thick sprocket 11 is 2.75mm±0.1mm, the thickness of the thin sprocket 12 is 1.55mm±0.1mm, and the chamfer angle of the upper side edges of the thick sprocket 11 is 155°. Therefore, the thick sprocket 11 will not interfere with the 13-speed chain 2, thereby reducing the rigid contact between the chain 2 and the sprockets during transmission. This in turn reduces abnormal noise during riding (especially in poor road conditions) and reduces friction between the chain 2 and the sprockets during insertion and removal, thereby increasing service life.

[0027] In this embodiment, the cross section of the thick tooth piece 11 is octagonal, and the cross section of the thin tooth piece 12 is rectangular.

[0028] like Figure 3 As shown, the thickness of the thin tooth piece 12 is less than the distance between the inner links 21; the thickness of the thick tooth piece 11 at its smallest point is less than the distance between the inner links 21, and its thickness at its largest point is less than the distance between the outer links 22. Moreover, in the engaged state, the distance between the chamfered surfaces of the thick tooth piece 11 at the same position is less than the distance between the inner links 21.

[0029] Effects of embodiments

[0030] According to the novel sprocket adapted to the 13-speed bicycle, because the four side edges of the rear tooth piece are provided with 155° chamfers, when used in cooperation with the 13-speed chain, interference with the inner chain piece of the chain does not occur, thereby avoiding problems such as disorderly introduction, blockage, and even jamming of the chain. In addition, because the tooth tips of the thick tooth piece and the thin tooth piece are higher than the height of the chain roller, the hidden danger of chain jumping and chain disengagement of the chain roller can be eliminated.

[0031] The above embodiment is a preferred case of the utility model, and is not used to limit the protection scope of the utility model.

Claims

1. A new type of sprocket adapted to 13-speed bicycles, comprising a sprocket body, characterized in that: The outer edge of the tooth disc body is provided with a plurality of thick tooth pieces and thin tooth pieces arranged in sequence and staggered in a circumferential direction, tooth tip heights of the thick tooth pieces and the thin tooth pieces are higher than a height of a chain roller, four side edges of the thick tooth pieces are all chamfered and extend to tooth tips of the thick tooth pieces, and the tooth tips of the thin tooth pieces are provided with a round corner structure. The width of the thick tooth piece is 2.75mm±0.1mm, The thickness of the thin tooth piece is 1.55mm±0.1mm, The chamfer angle of the upper side edge of the thick tooth piece is 155°.

2. The new tooth disc for adapting a 13-speed bicycle according to claim 1, characterized in that: wherein The tooth tip height difference between the thick tooth pieces, the thin tooth pieces and the chain roller is 0.3mm.

3. The new tooth disc for adapting a 13-speed bicycle according to claim 1, characterized in that: wherein The tooth disc body is provided with a mounting hole at the center thereof.

4. The new tooth disc for adapting a 13-speed bicycle according to claim 1, characterized in that: wherein The cross section of the thick tooth piece is octagonal, and the cross section of the thin tooth piece is rectangular.

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