JPH0559014U - Low noise chain transmission - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the generation of noise due to the meshing collision of the chain roller with the sprocket. [Barrel] The roller outer diameter of the roller chain or the wall thickness of the roller was changed to randomly contact the sprocket teeth to disperse the frequency of motion noise generated during meshing and reduce noise.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chain transmission used in automobiles, motorcycles, general industrial machines, and the like, and a chain used therein, and more specifically, a low-noise chain transmission capable of reducing noise generated when a chain and a sprocket mesh with each other. Regarding

[0002]

[Prior Art]

 Traditionally, chain transmissions have set the tooth profile pitch of their sprockets equal to or slightly larger than the chain pitch, and their root arc diameter equal to or greater than the roller outer diameter of the chain. Is set slightly larger to allow for some dimensional error in the sprocket and each part of the chain, so that the chain and sprocket will always mesh reliably.

Then, the roller of the chain sequentially meshes with the teeth of the sprocket to transmit the power, but at that time, the roller collides with the bottom arc of the sprocket, and this impact causes a large driving noise. As a method of reducing this driving noise, an elastic body such as rubber is attached to the sprocket, and when the chain collides with the bottom of the sprocket, the roller or the like comes into contact with the elastic body, and the elastic deformation of this elastic body reduces the impact energy. A method of absorbing a part of the noise to reduce noise, or attaching an elastic body such as rubber to the chain roller so that when the chain roller collides with the sprocket tooth bottom, this elastic body absorbs a part of the collision energy. There are ways to reduce chain noise.

[0004]

[Problems to be solved by the device]

 However, although the one using these elastic bodies is effective for low noise, the elastic body to which repeated impact load acts easily deteriorates relatively early and has a problem in durability and poor practicability. ..

Therefore, the present invention changes the meshing period when the chain roller meshes with the sprocket, thereby reducing the noise generated when the chain roller collides with the sprocket. The purpose is to provide.

[0006]

[Means for Solving the Problems]

 The present invention has been made in view of the above circumstances, in which a roller of a chain is formed such that its outer diameter is larger or smaller than a standard size, and at least two kinds of outer diameters differ from each other. The rollers are randomly arranged on one chain.

Alternatively, the chain rollers have at least two types of wall thickness and are randomly arranged in one chain.

[0008]

[Action]

 With the above configuration, when the chain meshes with the sprocket, two or more types of rollers with different roller outer diameters of the chain are mixed and randomly arranged, so that the distance between adjacent roller outer diameters, that is, the actual pitch is changed. Therefore, the meshing of the chains does not come into contact with the same place, the time interval of meshing becomes random and the meshing frequency is dispersed, and the drive noise generated when the chain meshes with the sprocket teeth can be reduced. it can.

[0009]

【Example】

 Hereinafter, embodiments according to the present invention will be described with reference to the drawings. FIG. 1 is an operational view showing the meshing state of the chain A and the sprocket B, and the roller 3 of the chain A sequentially meshes with the teeth of the sprocket B to transmit power.

FIG. 2 shows an embodiment of the present invention, in which A is a roller chain, which basically comprises a link pin 1, a bush 2, a roller 3, an inner plate 4 and an outer plate 5. It The feature of the present invention is that a roller 3a having a roller diameter larger than that of the standard size roller 3 or a roller 3b having a roller diameter smaller than the standard size is mixed in one chain A and configured in a random pattern. By doing so, the distance between adjacent roller outer diameters, that is, the substantial pitch is changed.

In the chain A in which such rollers are randomly assembled, the distance between the outer diameters of the rollers 3, 3a and 3b is not constant. That is, the chain has a substantially constant pitch. The roller of such a chain can change the incident angle at the time of colliding with the sprocket, disperse the meshing frequency component, and reduce the harsh noise.

FIG. 3 shows another embodiment of the present invention, which is basically composed of a link pin 1, a bush 2, a roller 3, an inner plate 4 and an outer plate 5. The outer diameter is a standard outer diameter. The roller thickness t is changed with respect to the wall thickness t of the standard roller 3 to form a thin roller 3d and a thick roller 3e, and the respective rollers are mixed to form a chain that is randomly assembled. As a result, the clearance 6 generated between the roller inner diameter and the bush outer diameter is changed.

In a chain in which such rollers are randomly assembled, the clearance of the roller that engages with the bush changes, and thus the distance of the roller outer diameter when the roller meshes with the sprocket, that is, the substantial pitch. Will change. Then, the incident angle at the time of colliding with the sprocket can be changed to disperse the meshing frequency component, and it is possible to reduce harsh noise.

Although the clearance is changed by changing the roller wall thickness in the above description, the clearance can be changed by using a standard roller and changing the outer diameters of the pins and the bushes, and the above-described effect is obtained. ..

[0015]

[Effect of the device]

 In the chain according to the present invention, the collision energy is changed by changing the distance between adjacent roller outer diameters to disperse the meshing frequency component and changing the angle of incidence when the roller slides on the sprocket teeth. It is possible to reduce annoying noise.

[Brief description of drawings]

FIG. 1 is an operation diagram showing a meshing state between a roller and a sprocket tooth of a chain according to the present invention.

FIG. 2 is a cross-sectional view of the chain of the present invention in which the outer diameter of the roller is changed.

FIG. 3 is a partial cross-sectional view of a chain in which the roller thickness is changed according to another embodiment of the present invention.

[Explanation of symbols]

 1 ... Pin 2 ... Bush 3 ... Roller 4 ... Inner plate 5 ... Outer plate 6 ... Clearance A ... Chain B ... Sprocket

Claims (2)

[Scope of utility model registration request] 1. A chain transmission device comprising a chain and a sprocket, wherein rollers of the chain are formed so that two or more kinds of outer diameters thereof are different from each other, and are randomly arranged. apparatus. 2. The chain used in the low noise chain transmission according to claim 1, wherein the rollers of the chain are formed such that the wall thickness thereof is thicker or thinner than a standard size.