JP2002087571A - Low noise type offset chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an offset chain capable of reducing collision sound and sliding sound between link bodies. SOLUTION: This chain 10 is formed by connecting links 12 having the same shape through connecting pins 14 endlessly. A bush 22 is provided at one-side ends of plates 20 and 20 of the link body 16. A pinhole 28 is formed at the other side ends of the plates 20 and 20. Resin parts 30 and 30 made of material different from that of the link body 16 are integrally molded outside respective one-side ends of plates 20 and 20. Collision or sliding between adjacent links in the connecting pin shaft direction occurs between different materials, and a noise reducing effect can be expected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset chain in which links are connected endlessly by connecting pins. More specifically, the present invention relates to an offset chain that can reduce noise generated when links adjacent in the axial direction of a connecting pin come into contact with each other.

[0002]

2. Description of the Related Art Offset chains are disclosed in
As shown in FIG. 2 of 72214, resin link bodies of the same shape are connected endlessly by connecting pins. In the offset chain described in the above publication, a top plate made of resin of the same material is integrally formed on the link body. In this type of offset chain, a bush hole through which the connecting pin penetrates is formed at one end of the link main body, and a pair of pin holes into which the connecting pin fits are formed at the other end of the link main body. By aligning the bush hole of one link with the pin hole of the adjacent link and inserting the connecting pin into each hole, the links are connected endlessly.

[0003]

When the offset chain is run, the link bodies of adjacent links move relative to each other in the axial direction of the connecting pin, and the link bodies come into contact with each other to generate noise. This noise is generated due to the presence of an axial gap between the connecting pins between the link bodies. However, even if the gap can be made as small as possible, it must be secured to some extent in order to smoothly bend the links. In particular, in an offset chain configured for curved conveyance, the gap is positively increased to allow horizontal bending between the links, so that noise due to collision between the link bodies must increase. .

[0004] It is an object of the present invention to provide an offset chain that can reduce the sound of collision between the link bodies and the sound of sliding contact, even if the gap exists.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a link body in which a bush hole through which a connecting pin is formed is formed at one end of a link body, and a pair of the connecting pins is fitted to the other end of the link body. In a resin offset chain in which a pin hole is formed and adjacent link bodies are connected endlessly by the connecting pins, one of the link body facing surfaces facing in the connecting pin axial direction is different from the resin forming the link body. The above problem has been solved by a low-noise offset chain formed by molding a resin material.

When the offset chain runs, the link body relatively moves in the axial direction of the connecting pin. At this time, the collision or sliding contact between the link bodies is a collision or sliding contact between members of different materials. The link body is made of a material that is advantageous in strength,
By molding a soft resin material on one of the link body facing surfaces, it satisfies the function of the link body that requires strength and abrasion resistance, and it is molded with a material that is advantageous for noise reduction only at places where noise occurs. Noise countermeasures can be taken while maintaining strength and the like.

Further, the present invention provides a low-noise offset chain in which one end of the link body including the bush in which the bush hole is formed is formed of a resin of a different material from a resin for forming the link body. . The present invention focuses on reducing noise generated when meshing with a sprocket, in addition to reducing noise generated between link bodies. Noise generated between the link bodies can be reduced by using a different material for the facing surface. In the offset chain, since the sprocket meshes with the bush of the link main body, it is preferable to form the bush with a relatively soft material. For example, the link body is formed of polyacetal resin, and one end of the link body including the bush hole is formed of polyamide resin, so that the noise generated by the collision and sliding contact between the link bodies and the collision and sliding contact between the link body and the sprocket. The noise generated by this can also be reduced.

In the present invention, it is preferable that the offset chain is formed by dissimilar material molding. Among them, the dissimilar material molding is a method in which a resin constituting a link body is first molded in a core, and then a resin of a different material is secondary molded in the same core or a different core. This is a method of injection molding an elastomer into a product. According to these methods, resin of two or more materials can be integrally formed, and the effect of reducing the parts management cost and the manufacturing cost can be reduced as compared with the case where an offset chain is formed by assembling the resin of another member. is there.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an offset chain according to the present invention will be described with reference to the drawings. 1 to 3 show a low noise offset chain according to a first embodiment of the present invention. FIG. 1 is a perspective view of the offset chain viewed from the bottom, FIG. 2 is a side view of the offset chain, and FIG. It is a bottom sectional view of an offset chain. The offset chain of the present embodiment is a resin table top chain. The chain 10 has links 12 of the same shape connected endlessly by connecting pins 14. Each link 12 is a link body 1 that pulls adjacent links.
6 and a top plate 18 on which articles are loaded. In the present embodiment, the link body 16 and the top plate 18 are integrated, but after these are formed separately, the link 1
Some are assembled as two.

The link body 16 has a pair of left and right plates 20 and 20 to be mirrored. At one end of the plates 20, 20, a bush 22 integrally formed between the plates 20, 20 is provided. The bush 22 has a bush hole 24 through which the connecting pin 14 penetrates and into which the connecting pin 14 is loosely fitted. The opposite circular thick portions 26 at the other ends of the plates 20 and 20 have D
A pin hole 28 having a shape is formed. By inserting the D-shaped connection pin 14 into the bush hole 24 and the pin hole 28 that are aligned, the link 12 is connected to be able to bend around the connection pin 14.

In order for the link 12 to be freely bendable, 1
It is necessary that one end of one link body 16 and the other end of the adjacent link body 16 have a gap in the opposing surface in the axial direction of the connecting pin, and this gap causes collision or sliding contact between the link bodies 16. Generates noise. In the present invention, resin portions 30, 30 of dissimilar materials are integrally formed on one of the opposing surfaces, in the present embodiment, on the outside of each of the ends of the plates 20, 20, respectively. By providing the dissimilar material resin portion 30, the collision or sliding contact between adjacent links in the connecting pin axial direction occurs between dissimilar materials, thereby reducing the noise as compared with the case where the links are formed of the same material. Can be expected.

In the present embodiment, the dissimilar material resin portion 30,
30 only partially occupy the thickness of the plates 20, 20 and the traction generated between the links
It is a structure that can bear only by itself. Therefore, for a link portion requiring strength, a resin of a material advantageous for strength is selected, and a resin of a relatively soft material for the dissimilar material resin portion 30 is selected, so that noise is reduced in a state where strength is secured. Can be.

The dissimilar material resin portion 30 is preferably formed integrally with the link body 16 by dissimilar material molding. According to the molding method, the dissimilar resin portion can be integrally molded in the link main body 16, so that the manufacturing cost and the management cost due to the increase in the number of parts can be suppressed, and the noise can be reduced. Further, it is preferable that the dissimilar material resin portion 30 is integrally formed with the link body 16 so as to surround the bush hole 24 as shown in the figure. Welding occurs when two or more types of resin are integrally molded. Even if the dissimilar material resin portion 30 separates from the weld, the dissimilar material resin portion 30 does not fall off the chain. . From this viewpoint, it is preferable that the thickness of the dissimilar material resin portion 30 be larger than the maximum gap. By doing so, the dissimilar material resin portion 30 does not deviate from the predetermined position.

4 to 6 show a low noise type offset chain according to a second embodiment of the present invention. FIG. 4 is a perspective view of the offset chain viewed from the bottom, FIG. 5 is a side view of the offset chain, FIG. 6 is a bottom sectional view of the offset chain. As with the offset chain 10 of the first embodiment, the offset chain 50
2 are connected endlessly by a connecting pin 54, and a link 5
2 includes a link body 56 having a pair of left and right plates 60, 60 and a bush 62, and a top plate 58.
A bush hole 64 is formed in the bush 62, and a pin hole 68 is formed in the circular thick portion 66 of the plates 60, 60.

In this embodiment, the dissimilar resin portion 70 is used.
Are formed at one end of the plates 60, 60 including the bush 62. By doing so, the collision or sliding contact between adjacent links in the axial direction of the connecting pin occurs between different materials, so that an effect of reducing noise as compared with the case where the links are formed of the same material can be expected. it can. In addition, bush 6
By providing the dissimilar material resin portion 70 including 2, the noise between the sprocket and the sprocket can be reduced. When the offset chain 50 meshes with the sprocket, the bush 62 exclusively contacts the sprocket. If the material of the sprocket is determined, the link body 5
By selecting the material in consideration of the material of No. 6 and the material of the sprocket, a further noise reduction effect can be expected.

The preferred resin combination varies depending on the use conditions of the offset chain. For example, it is conceivable that the link main body is made of polyacetal resin and the resin part of a different material is made of polyamide resin. The above materials are merely examples, and in selecting the materials, the use conditions and cost of the offset chain should be sufficiently considered.

[0017]

According to the first aspect of the present invention, a resin made of a different material from the resin forming the link body is molded on one of the opposing surfaces of the link body that collides or slides in the axial direction of the connecting pin. The collision or sliding contact is a collision or sliding contact between different materials, and an effect of reducing noise as compared with the collision or sliding contact between the same materials can be expected. In particular, in a chain in which the link pin axial gap between the link bodies must be large, such as a curved conveying chain, a large noise reduction effect can be expected by using different materials as in the present invention. it can. In addition, by selecting the material of the link body from materials with excellent strength and abrasion resistance, and selecting the material forming one of the link body facing surfaces from a soft material, noise can be reduced while maintaining strength. Can be.

According to the second aspect of the present invention, since one end of the link body including the bush having the bush hole is formed from a resin of a different material, the dissimilar material portion contacts or slides with the link body of an adjacent link. In addition to being able to expect the effect of reducing the noise generated by the bushing, the effect of reducing the noise generated when the offset chain and the sprocket mesh with each other can be expected by forming the bush with a relatively soft material.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of an offset chain according to the present invention as viewed from a bottom surface.

FIG. 2 is a side view of the offset chain of FIG.

FIG. 3 is a bottom sectional view of the offset chain of FIG. 1;

FIG. 4 is a perspective view of a second embodiment of the offset chain according to the present invention as viewed from the bottom.

FIG. 5 is a side view of the offset chain of FIG. 4;

FIG. 6 is a bottom sectional view of the offset chain of FIG. 4;

[Explanation of symbols]

 10,50 Offset chain 12,52 Link 14,54 Linking pin 16,56 Link body 18,58 Top plate 20,60 Plate 22,62 Bush 24,64 Bush hole 26,66 Circular thick portion 28,68 Pin hole 30 , 70 Resin parts of different materials

Claims (2)

[Claims] A bush hole through which a connecting pin penetrates is formed at one end of a link body constituting a link, and a pair of pin holes into which the connecting pin fits are formed at the other end of the link body, and are adjacent to each other. In a resin offset chain in which the link bodies are connected endlessly with the connecting pins, one of the link body facing surfaces facing each other in the connecting pin axial direction,
A low-noise offset chain characterized by molding a resin of a different material from the resin for forming the link body. 2. The low noise offset chain according to claim 1, wherein one end of the link main body including the bush having the bush hole is formed of a resin different from a resin forming the link main body.