JP2001173731A - Bush for roller chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability by suppressing initial elongation and abrasion elongation of a roller chain. SOLUTION: A board material is winding worked to form a cylindrical material 11, and a butt joint part P1 of the board material is joined by partially welding so as to form a bush B. The bush B has large mechanical strength in an axial direction and a diameter direction, it is not deformed even if it is pressed in an inner link plate. Also, it is brought into uniform contact with a roller and a pin so as to minimize initial elongation and abrasion elongation of the roller chain.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush of a roller chain capable of improving durability by minimizing initial elongation and wear elongation.

[0002]

2. Description of the Related Art A roller chain includes a bush B and a pin PN.
The inner link plates LP1 and LP1, and the outer link plates LP2 and LP2 are alternately and flexibly linked via a link (FIG. 8).

The bush B is formed by winding a plate material into a cylindrical shape, and the inner link plates LP1, LP1 are press-fitted at their ends to connect the inner link plates LP1, LP1. The bush B has a link plate LP1
, LP1 is rotatably mounted, and a pin P connecting the outer link plates LP2, LP2.
N is rotatably inserted. However, the inner diameter and the outer diameter of the bush B correspond to the outer diameter of the pin PN and the inner diameter of the roller R, respectively.

[0004]

According to the prior art, the bush B is provided with the inner link plates LP1, LP1.
When pressed into the roller, the butted portion is deformed so as to partially open (Fig. 8), so that the roller chain does not evenly contact the roller R and the pin PN, and the initial elongation and wear elongation of the roller chain become excessive, and the durability is impaired. There was a problem that sometimes. This is because the deformed bush B partially contacts the roller R and the pin PN, and locally wears the inner surface of the roller R, the outer surface of the pin PN, and the outer and inner surfaces of the bush B.

Accordingly, an object of the present invention is to provide a roller capable of improving durability by minimizing initial elongation and abrasion elongation by welding and joining butt portions of plate materials in view of the problems of the prior art. To provide a bush for a chain.

[0006]

According to a first aspect of the present invention, there is provided a tubular member formed by winding a plate material, and the tubular member is joined by welding a butt portion of the plate material. Is the gist.

[0007] The welding depth of the sheet material can be set to 20 to 80% of the sheet thickness from the surface.

The butted portions of the plate can be partially welded at a predetermined pitch.

[0009]

According to the structure of the present invention, since the tubular member is formed by winding a plate member, and the butt portion of the plate member is welded and joined, the bush is mechanically high in the axial and radial directions. Can be used. Therefore, the bush does not deform even if it is press-fitted into the inner link plate, makes uniform contact with the rollers and pins, prevents local wear, and can sufficiently suppress initial elongation and wear elongation.

By setting the welding depth to be equivalent to 20 to 80% of the plate thickness from the surface, the cylindrical member can realize necessary and sufficient joining strength at the butted portion of the plate members. If the welding depth is too large, the inner diameter of the cylindrical material will change locally,
This is because harmful buildup or burrs may be generated on the inner surface to deteriorate the dimensional accuracy and surface accuracy of the inner diameter. If the welding depth is too small, sufficient joining strength cannot be obtained. The welding depth is particularly preferably set to 40 to 60% of the plate thickness.

If the butted portions of the plate are partially welded at predetermined intervals, the welding time can be shortened and the productivity can be improved. In the case of partial welding, when the plate material is stainless steel, in addition to non-fused electrode arc welding such as TIG welding, atomic hydrogen welding, carbon arc welding, etc., electron beam welding,
Plasma welding, laser welding, spot welding and the like can be used.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

The bush B of the roller chain comprises a cylindrical member 11 formed by winding a plate material (FIGS. 1 and 2).

The cylindrical member 11 is formed by winding a plate material having a thickness t to form a cylinder having an inner diameter D1 and an outer diameter D2 = D1 + 2t. Further, the cylindrical members 11 are joined by partially welding the butted portions P1 of the plate members at welding positions Y, Y,... Set at predetermined pitches p. The welding depth d from the surface at each welding position Y is set to be equivalent to 20 to 80% of the plate thickness t, particularly preferably to be equivalent to 40 to 60%.

The bush B is manufactured as follows (FIGS. 3 and 4).

That is, a sheet material P having a thickness t is cut into a predetermined size (FIG. 4A), and the sheet material P is wound into a cylindrical material 11.
Is formed (FIGS. 2B and 2C). Next, the bushing B can be manufactured by partially welding the butted portions P1 of the plate material P at a predetermined pitch p (FIGS. 3D and 1) and polishing the outer surface.

The bush B manufactured as described above is used by being incorporated into a roller chain (FIGS. 5 and 6).

The roller chain is connected to inner link plates LP1 and L1 via a bush B on which a roller R is mounted and a pin PN.
P1 is formed by connecting outer link plates LP2 and LP2. The bush B has a sufficiently high mechanical strength in the radial and axial directions because the butt portion P1 is partially welded and joined at the welding positions Y, Y..., And the ends are pressed into the inner link plates LP1, LP1. However, it is not easily deformed. Therefore, the bush B includes the pin PN and the roller R
The pin PN, the roller R, and the bush B itself are not locally worn, and there is no possibility that excessive initial elongation or abrasion elongation occurs in the roller chain.

In the above description, the number of welding positions Y, Y,... Joining the butt portions P1 can be arbitrarily changed to one or more irrespective of FIG. Further, the plate material P forming the cylindrical material 11 may be formed such that the end faces Pa, Pa are slanted in the winding direction (FIG. 7). By winding the plate material P, the end surfaces Pa and Pa are butted against each other to bring the butted portion P1 into close contact (indicated by a two-dot chain line in the figure), whereby a highly accurate cylindrical material 11 can be formed.

[0020]

As described above, according to the present invention, the cylindrical member formed by winding is formed by welding the butted portions of the plate members to form a mechanically large mechanical member in the axial and radial directions. Since the strength can be realized, there is no possibility that the roller chain is deformed even if it is press-fitted into the link plate, and there is an excellent effect that the initial elongation and wear elongation of the roller chain can be minimized and the durability can be improved.

[Brief description of the drawings]

FIG. 1 is an overall perspective explanatory view.

FIG. 2 is an enlarged cross-sectional view corresponding to line XX of FIG. 1;

FIG. 3 Manufacturing process diagram

FIG. 4 is an explanatory view of a manufacturing process.

FIG. 5 is an explanatory view of a use state.

FIG. 6 is an enlarged sectional view of a main part of FIG. 5;

FIG. 7 is a schematic explanatory view showing another embodiment.

FIG. 8 is a perspective explanatory view showing a conventional example.

[Explanation of symbols]

 B: bush P: plate material P1: butted portion p: pitch t: plate thickness d: welding depth 11: cylindrical material

Claims (3)

[Claims] 1. A bush for a roller chain, comprising a tubular material formed by winding a plate material, wherein the tubular material is joined by welding butted portions of the plate material. 2. The welding method according to claim 1, wherein the welding depth of the sheet material is set to 20 to 80% of the sheet thickness from the surface.
The bush of the described roller chain. 3. The bush of a roller chain according to claim 1, wherein the butted portions of the plate members are partially welded at a predetermined pitch.