JPH0942385A - Compound organized chain and compound tooth profile sprocket for high speed transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce generation of noise and vibration at high speed transmission by combining together a plural sorts of links of various link pitches, and constituting it so as to generate disturbance in periodic exciting force due to collision at every one pitch at engagement between a roller and the tooth face of a sprocket. SOLUTION: A roller chain 1 is constituted by connecting together many links and rotatably holding many rollers 2 with the links. In this case, the link pitch of the roller chain 1 is not the same in all the links, and a pitch P1, a space between the centers 01, 02 of rollers 2A, 2B differs from a pitch P2, a space between the centers 02, 03 of rollers 2B, 2C. Meanwhile, a sprocket 3 on the drive side to be engaged with the respective rollers 2 of the roller chain 1 is formed so that all the spaces between teeth are the same pitch. Hereby, disturbance is applied to periodic exciting force at engaging the roller 2 with the sprocket 3, and hence generation of noise and vibration at high speed transmission is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a roller chain and a sprocket used for chain transmission means.

[0002]

2. Description of the Related Art A conventional chain transmission means using a roller chain is a roller of many sizes defined by JIS (Japan), ANSI (US), BS (UK) and the like, as well as rolling bearings. A chain and a sprocket with a large number of teeth that mesh with it are available.
Further, since it can be obtained at a relatively low cost as a power transmission means for long shaft distances, it has been widely used as a power transmission means for mechanical devices used in various industrial fields.

[0003]

However, the conventional chain transmission means is different from the gear transmission means, which is the same meshing transmission means, in the non-uniform speed of rotation and the meshing between the tooth surfaces of the rollers and the sprockets. There is a problem of noise generation due to time collision.

In the roller chain, when the roller meshes with the tooth surface of the sprocket, collision between the tooth surface of the sprocket and the roller is repeated at a pitch interval of the link, and the number of revolutions of the sprocket is n (rpm). If the number is N,
Collisions occur every nN / 60 times per second, and the frequency of the exciting force due to the collision becomes the fundamental frequency, which causes noise and vibration.

Further, the energy of collision at the time of meshing increases in proportion to the square of the product of the rotation speed of the sprocket and the link pitch of the chain (distance between the roller centers), so that the rotation speed of the sprocket increases. Since a large noise is generated and the power transmission efficiency is reduced, the chain transmission means is not suitable for high-speed power transmission. And, in recent years, high performance of mechanical equipment, that is,
With the demand for higher speed, higher efficiency, and lower noise, the power transmission means using the roller chain as described above is supposed to promote the deterioration of the environment, and its application is narrowed to low speed power transmission. It is currently being used as.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the problems in the conventional chain transmission as described above, and to provide a composite knitting chain for high speed transmission and a composite tooth profile sprocket with less noise and vibration during high speed transmission. And

[0007]

To achieve the above object, the composite knitting chain for high speed transmission according to the present invention is constructed by first combining a plurality of types of links having different link pitches to each other when meshing a roller and a sprocket tooth surface. A disturbance is generated in the periodic excitation force due to the collision of the links for each pitch.

Secondly, a plurality of types of links having different link masses are combined so that a disturbance is generated in the periodic exciting force due to the collision of the links with each other when the roller and the sprocket tooth surface are engaged with each other at every pitch. It was done.

Thirdly, a plurality of types of rollers having different outer diameters are combined so that a disturbance is generated in the periodic exciting force due to the collision of the links at every pitch when the rollers and the tooth surface of the sprocket are meshed. It was done.

The composite tooth profile sprocket of the present invention is
Combining multiple types of tooth shapes with different tooth pitches,
1 of the link when the roller and the tooth surface of the sprocket mesh
A disturbance is generated in the periodic excitation force due to the collision at each pitch.

[0011]

When the tooth surface of the sprocket and the roller of the chain are meshed with each other, a collision occurs between them. A frequency different from the fundamental frequency is generated in the frequency of the noise generated by the force, and the collision energy is dispersed in each frequency range. As a result, the peak frequency of noise is dispersed into a plurality of frequencies, and the level of noise intensity is reduced.

[0012]

1 shows a first embodiment of a composite knitting chain for high speed transmission according to the present invention, in which a roller chain 1 is constituted by connecting a number of links (not shown), A large number of rollers 2 are rotatably held by the links. As shown in the figure, the link pitch of the roller chain 1 (the interval between the rollers 2 adjacent to each other) is not the same in all the links, and the center of the rollers 2A and 2B of the rollers 2 is the same. O1, O
The pitch P1 which is the interval between the two and the pitch P2 which is the interval between the centers O2 and O3 of the roller 2B and the roller 2C are different from each other.

On the other hand, each roller 2 of the roller chain 1
The drive-side sprocket 3 that meshes with is configured such that the tooth intervals are all the same pitch. Then, when the roller 2 of the roller chain 1 meshes with the sprocket 3 which is rotationally driven at a constant rotation speed, as shown in the figure, the center O1 of the roller 2A already meshed with the teeth of the sprocket 3
The following roller 2B, which is connected by a link (not shown) about the axis, approaches the tooth bottom 3A as the sprocket 3 rotates in the counterclockwise direction in the figure, and a collision occurs when meshing.

The roller 2B is a tooth bottom 3 of the sprocket 3.
When the sprocket 3 further rotates in the same direction after meshing with A, the succeeding roller 2C further rotates about the center O2 of the roller 2B supported on the tooth bottom 3A as an axis, and the rear side of the tooth bottom 3A. Collide with and mesh with the tooth bottom 3B.

The above-described operation is repeated in accordance with the rotation of the sprocket 3, and the respective rollers 2 of the roller chain 1 mesh with the teeth of the sprocket 3 in sequence.
Since the pitch P1 and the pitch P2 of the links are different from each other, the collision at the time of meshing is 1 as in the roller chain 1 in which all the links have the same pitch.
The collision does not occur regularly for each link, and a disturbance occurs in the periodic excitation force generated by the collision.

Next, as shown in FIG. 2, the inner link 14 and the outer link 1 which constitute the roller chain 11 are shown in FIG.
5, some of the outer links 15A are formed thicker than others. Therefore, only the portion of the outer link 15A,
It has a larger mass than other parts, and when the rollers 12A and 12B provided in this part engage with a sprocket on the drive side (not shown), they are attached to the positions of other links. Disturbance occurs in the periodic excitation force due to the collision that occurs when the roller 12 in contact with the tooth surface of the sprocket.

Further, FIG. 3 shows a third embodiment of the composite knitting chain for high speed transmission according to the present invention. In this embodiment, one diameter of the roller 22 provided on the roller chain 21 is The part is different from other parts. In the case of the same drawing, among the rollers 22 attached to the roller chain 21, the roller 22A is formed to have a diameter slightly smaller than the other rollers. On the other hand, the tooth profile of the drive side sprocket 23 with which the respective rollers 22 mesh is
The teeth are all arranged at the same pitch.

In the above structure, the roller chain 21
When the sprocket 23 around which is rotated rotates, each roller 22 attached to the roller chain 21 sequentially meshes with the tooth surface of the sprocket 23, and at that time, the collision between each roller 22 and the tooth surface is repeated. However, since the roller 22A having a small diameter has a smaller mass than the other rollers and the meshing position with the tooth surface of the sprocket is different from that of the other rollers, the regular collision for each link does not occur. Disturbance occurs in the periodic excitation force due to the collision.

Next, FIG. 4 shows one embodiment of the compound tooth profile sprocket of the present invention. In FIG. 4, the roller chain 31 wound around the drive side sprocket 33 is a normal roller chain. Similarly, although the pitch P0 of the link is made equal in each part, the rollers 32 of the roller chain 31 and the sprocket 3 are made different by making the pitches of the teeth of the sprocket 33 different from each other.
The periodic exciting force generated by the collision with the tooth surface of No. 3 is disturbed. That is, sprocket 3
No. 3 has a tooth pitch angle of α1 and α2, and the roller chain 31 is connected to the sprocket 33.
Of the rollers 32 when the rollers 32 of
A portion such as the roller 32A that meshes with the tooth bottom 33A of the sprocket 33 and a portion like the roller 32B that does not mesh with the tooth bottom 33B but abuts on the tooth tip 33C side.
Each roller 32 and sprocket 33 of the roller chain 31
The periodic exciting force generated by the collision with the tooth surface of the roller 3
It is configured so as to be disturbed in the portion 2B.

It should be noted that changing the tooth pitch of the sprocket 33 can be easily performed by making a sintered product in mass production, and in the case of making by gear cutting, It can be manufactured with a single cutter.

Further, FIG. 5 shows an embodiment in which the composite knitting chain for high speed transmission of the present invention and a composite tooth profile sprocket are used in combination, and the pitch of the links is changed as shown in FIG. This is a combination of the roller chain 41 that is made to rotate and the sprocket 43 that changes the tooth pitch as shown in FIG. As shown in FIG. 5, so that each roller 42 of the roller chain 41 and the tooth surface of the sprocket 43 fit together,
The tooth pitch of the sprocket 43 is also partially changed corresponding to the partial change of the link pitch of the roller chain 41.

That is, the tooth pitch P1 'of the sprocket 43 corresponds to the link pitch P1 between the center O1 of the roller 42A and the center O2 of the roller 42B and between the center O3 of the roller 42C and the center O4 of the roller 42D, and The tooth pitch P2 'of the sprocket 43 corresponds to the link pitch P2 between the center O1 of the roller 42B and the center O3 of the roller 42C.

According to the combination of the roller chain 41 and the sprocket 43, the tooth surfaces of the roller 42 and the sprocket 43 are always appropriate without being affected by the changes in the link pitch of the roller chain 41 and the tooth pitch of the sprocket 43. Since the gears mesh with each other in a different positional relationship, smooth and efficient power transmission can be performed, and a disturbance can be generated in the periodic excitation force generated by the collision between each roller 42 and the tooth surface of the sprocket 43. The roller chain 4
The change in the link pitch of 1 is repeated in the same pattern when the sprocket 43 makes one rotation. It should be noted that, in order to generate a disturbance in the periodic exciting force due to the collision of each pitch of the link at the time of meshing between the roller and the tooth surface of the sprocket, a plurality of types of means described in each of the above-described embodiments may be used in combination. Good.

[0024]

As described above, according to the composite knitting chain for high speed transmission and the composite tooth profile sprocket of the present invention, the cyclic application of each pitch of the links when the roller and the tooth surface of the sprocket are engaged. Since the vibration force is configured to generate a disturbance, the peak of noise generated by the collision can be dispersed in a plurality of frequency ranges, and high-speed transmission can be performed with low noise.

[Brief description of drawings]

FIG. 1 is the first of the high-speed transmission composite knitting chain of the present invention.
FIG.

FIG. 2 is a second part of the high speed transmission composite knitting chain of the present invention.
FIG.

FIG. 3 is a third part of the high speed transmission composite knitting chain of the present invention.
FIG.

FIG. 4 is a view showing an embodiment of the compound tooth profile sprocket of the present invention.

FIG. 5 is a view showing an embodiment in which the composite knitting chain for high speed transmission of the present invention and a composite tooth profile sprocket are used in combination.

[Explanation of symbols]

1,11,21,31,41 Roller chain 2 (2A, 2B, 2C), 12 (12A, 12B), 2
2 (22A), 32 (32A, 32B), 42 (42
A, 42B, 42C, 42D) Roller 3, 23, 33, 43 Sprocket 14 Inner link 15 (15A) Outer link

Claims (4)

[Claims] 1. A structure in which a plurality of types of links having mutually different link pitches are combined so that a disturbance is generated in a periodic exciting force due to a collision for each pitch of the link when a roller and a sprocket tooth surface are meshed with each other. Characteristic high-speed composite knitting chain. 2. A structure in which a plurality of types of links having different link masses are combined so that a disturbance is generated in a periodic exciting force due to a collision of each pitch of the link when the roller and a sprocket tooth surface are meshed with each other. A composite knitting chain for high-speed transmission. 3. A structure in which a plurality of types of rollers having different outer diameters are combined with each other so that a disturbance is generated in the periodic exciting force due to the collision of the links with the tooth surface of the sprocket at each pitch of the links. A composite knitting chain for high-speed transmission. 4. A structure in which a plurality of types of tooth profiles having different tooth pitches are combined with each other so that a disturbance is generated in a periodic exciting force due to a collision of a link at each pitch when a roller and a sprocket tooth surface are meshed with each other. A compound tooth profile sprocket characterized by.