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Sprocket for chain

A sprocket and chain technology, applied in the direction of belts/chains/gears, transmission chains, portable lifting devices, etc., can solve problems such as hindering the smooth meshing of rollers and sprockets, chain vibration, and increased noise, etc., to achieve Engagement sound reduction, vibration reduction and noise, vibration and noise reduction effect

Inactive Publication Date: 2009-11-18
TSUBAKIMOTO CHAIN CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the frequency of vibration and noise determined by the number of teeth increases
[0029] In addition, in the low-noise chain transmission disclosed in Patent Document 1, since the tangent to the roller at the portion where the roller abuts on the tooth surface portion of the sprocket is formed at a small angle, the The angle formed by the center of the sprocket and the center of the sprocket, the small angle can make the roller and / or the tooth surface elastically deform while making the roller in place on the tooth root or sliding contact on the tooth surface, Moving to the vicinity of the dedendum, the impact when the roller meshes with the tooth surface of the sprocket is alleviated, and the noise during meshing can be reduced. The state meshing between the tooth parts of the sprocket prevents the smooth meshing between the rollers and the tooth parts of the sprocket on the side where the roller chain is meshed from the sprocket, which will cause chain vibration. problems such as noise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The chain sprocket according to the first embodiment of the present invention will be described below.

[0081] have figure 1 The tooth-shaped standard roller chain sprockets (hereinafter simply referred to as sprockets) 11 a are applied to the standard roller chain 50 .

[0082] In the sprocket 11a, a plurality of teeth 15 are formed in tooth grooves 14 continuous with the dedendum portion 13 through the opposing tooth surfaces 12a and 12b. In addition, in figure 1 In , for comparison, the ISO tooth shape (standard tooth shape) is shown by a dotted line.

[0083] Such as figure 1As shown, the tooth shape of the sprocket 11a is formed so that the tooth surface 12a on the front side in the rotation direction of the sprocket 11a and the tooth surface 12b on the back side in the rotation direction of the sprocket 11a are connected to the rotation center O (not shown) of the sprocket 11a and each tooth. The dedendum center line X at the center of the root portion 13 ...

Embodiment 2

[0094] The chain sprocket according to the second embodiment of the present invention will be described below.

[0095] In addition, the tooth profile of the chain sprocket 11b of Example 2 is the same as figure 1 The tooth profile of the illustrated embodiment 1 is the same, so the explanation is omitted.

[0096] Compared with the above-mentioned embodiment 1 of the present invention having two kinds of pitch angles θ-Δθ and θ+2Δθ of different sizes, the pitch angle of the teeth of the sprocket 11b only has three kinds of tooth shapes with different sizes The pitch angle is different. As described above, for the convenience of the following description, the tooth profile pitch angle θ determined by the formula θ=360° / z is called a standard pitch angle.

[0097] The sprocket 11b has three types of tooth profile pitch angle θ (standard pitch angle θ), θ+Δθ, and θ−Δθ with different sizes. That is, the tooth profile pitch angle θ+Δθ is larger than the standard pitch angle θ ...

Embodiment 3

[0103] Next, a chain sprocket according to Embodiment 3 of the present invention will be described.

[0104] have figure 2 The shown tooth-shaped standard roller chain sprocket (hereinafter simply referred to as a sprocket) 21 a is a sprocket applied to the standard roller chain 50 .

[0105] In the sprocket 21a, a plurality of teeth 25 are formed in tooth grooves 24 continuous to the dedendum portion 23 by opposing tooth surfaces 22a, 22b. In addition, in figure 2 In , for comparison, the ISO tooth shape (standard tooth shape) is shown by a dotted line.

[0106] Such as figure 2 As shown, the tooth shape of the sprocket 21a is formed so that the tooth surface 22a on the front side in the rotation direction of the sprocket 21a and the tooth surface 22b on the back side in the rotation direction of the sprocket 21a are connected to the rotation center O (not shown) of the sprocket 21a and each tooth. The dedendum part center line X of the dedendum part 23 at the center o...

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PUM

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Abstract

The present invention provides a sprocket for a chain drive, capable of reducing vibrations and noises generated by engagement of chain and sprocket teeth by optimizing the tooth shape of the sprocket and tooth-shaped pitch angle, moreover, a standard chain is recessed from the sprocket smoothly, and the manufacture is easy and the vibration noise is reduced. The sprocket of a chain transmission has at least two different pitch angles arranged irregularly in the direction of the circumference of the sprocket's pitch circle. The diameter of the tooth gap bottom circle of the sprocket is larger than the diameter of tooth gap bottom circle of a standard sprocket having the same number of teeth. The teeth are integrally molded as a part of the sprocket by sintering.

Description

technical field [0001] The present invention relates to a sprocket for a chain that reduces noise generated when a roller of a roller chain or a bush of a bush chain meshes with the teeth of the sprocket and smoothly engages out the sprocket. The sprocket for a chain has: A tooth space where the tooth surface and the tooth root are continuous; and a plurality of teeth formed between adjacent tooth spaces with which the rollers of the roller chain or the bushes of the bush chain mesh. Background technique [0002] Conventionally, a chain transmission device in which a chain is mounted on at least two sprockets on the driving side and the driven side to transmit power has been widely used, and it is desired to reduce the noise level in either application. [0003] In particular, in the engine of an automobile, in applications such as transmissions that transmit the rotation of the crankshaft to the camshaft, the combustion efficiency of the engine becomes higher and the output...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H55/30
CPCF16H55/08F16H2055/306F16H55/30F16G13/02F16H7/06
Inventor 佐仓俊儿园田胜敏平井晶
Owner TSUBAKIMOTO CHAIN CO
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