JP3728488B2 - Plain bearing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plain bearing. As this slide bearing, it is used for rotation support parts, such as a heat treatment furnace, for example.
[0002]
[Prior art]
Conventionally, as a sliding bearing, it is used for an axial sliding part and a rotational sliding part. As this sliding bearing, for example, from a molded body obtained by sintering a powder containing carbon as a main component and containing an appropriate thickener. There is something to be.
[0003]
[Problems to be solved by the invention]
By the way, it has been pointed out that conventional sliding bearings are insufficient in sliding resistance and wear amount and are brittle, and it is required to reduce sliding resistance and wear amount and to increase strength. There is room for improvement.
[0004]
In addition, it is known that a diamond-like carbon (DLC) film is formed on the bearing surface by CVD, ion plating or the like as a method for increasing the strength of the surface of the sliding bearing, but this film has a Vickers hardness of about Hv8000. However, the roughness may not be 1 μm or less depending on the forming method.
[0005]
In view of such circumstances, an object of the present invention is to improve sliding characteristics, wear resistance and strength in a sliding bearing.
[0006]
[Means for Solving the Problems]
The plain bearing according to the invention of claim 1 is made of amorphous carbon having a surface coated with a fluorine resin film.
[0007]
In the plain bearing according to the second aspect of the present invention, amorphous carbon whose surface is coated with a fluorine-based resin film is formed in an annular shape, and is fitted to the inner periphery or outer periphery of the metal ring through an elastic body. Structure.
[0008]
A plain bearing according to a third aspect of the invention is formed by heating and pressure sintering the amorphous carbon of the first or second aspect, wherein a powder comprising silicon as a main component and silicon and boron is blended. It is supposed to be.
[0009]
In the plain bearing according to the invention of claim 4, the elastic body of claim 2 is made of an elastomer.
[0010]
As described above, if the plain bearing is made of amorphous carbon and has a fluorine resin film formed on the surface as in the invention of claim 1, the strength is higher than that of the conventional product, and the surface fluorine resin film. Thus, the sliding resistance and the amount of wear during the sliding operation can be reduced.
[0011]
According to a second aspect of the present invention, there is provided a structure in which amorphous carbon with a fluorine-based resin film is formed in an annular shape and is fitted to the inner periphery of the metal ring through an elastic body such as an elastomer. In this case, the load resistance is improved such that the impact can be mitigated, and even if the amorphous carbon is broken, it is difficult for the fragments to be detached from the inner periphery of the elastic body and the metal ring.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0013]
1 and 2 show an embodiment of the present invention. FIG. 1 is a perspective view of a sliding bearing, and FIG. 2 is a longitudinal sectional view of a rotary support structure using the sliding bearing of FIG.
[0014]
In the figure, 1 indicates the entire slide bearing. This plain bearing 1 has a structure in which an amorphous carbon 2 formed in a cylindrical shape is fitted into the inner periphery of a metal sleeve 4 through a cylindrical elastic body 3 by press fitting.
[0015]
A fluorine-based resin film 5 is formed on the surface of the amorphous carbon 2. The fluorine resin film 5 is, for example, PTFE (polytetrafluoroethylene).
[0016]
The elastic body 3 is an elastomer or a synthetic rubber. The metal sleeve 4 is a steel pipe or the like.
[0017]
By the way, the slide bearing 1 as described above is used in a form that supports the rotation or axial movement of the shaft body 11 inserted concentrically in a non-contact manner in the inner periphery of the housing 10 as shown in FIG. Is done. In that case, the slide bearing 1 is fitted and attached to the inner periphery of the housing 10 by press fitting, and the shaft body 11 is inserted through the inner periphery of the slide bearing 1 through a required gap.
[0018]
By the way, the amorphous carbon 2 is prepared by preparing a powder obtained by blending silicon (Si), boron (B) and a thickener with about 90 wt% of carbon (C) with a die press. It is manufactured by applying isotropic heat and pressure sintering called hot isostatic press (HIP). As conditions for this sintering, for example, the atmospheric temperature is set to about 1000 to 1700 ° C., the press pressure is set to 5 to ² × 10 ⁶ kg / cm ² , and the sintering is performed for about 1 to 5 hours. After sintering, finish processing is performed to a predetermined size and roughness (0.2 to 2 μm) by appropriate grinding or the like.
[0019]
The amorphous carbon 2 thus produced is immersed in a fluorine-based resin solution, taken out, and then baked at a required temperature (for example, 100 to 120 ° C.) for about 5 hours in a baking furnace. By this firing, the fluorine-based resin film 5 is formed on the surface of the amorphous carbon 2 and a required amount of fluorine is diffused into the surface layer portion of the amorphous carbon 2. The film thickness of the fluorine-based resin film 5 is managed to be 1 μm or less, for example.
[0020]
As described above, the sliding bearing 1 according to this embodiment, for example, when the impact is applied to the sliding bearing 1 through the housing 10 in the usage situation shown in FIG. Since it is relieved by the sleeve 4 and the elastic body 3, the amorphous carbon 2 of the slide bearing 1 is hardly damaged. Even if the amorphous carbon 2 is damaged, it is difficult for the fragments to be detached from the inner circumference of the metal ring body 4 and the elastic body 3. It can be used continuously.
[0021]
In addition, the strength of the amorphous carbon 2 itself is higher than that of the conventional product, and the fluorine resin film 5 on the surface of the amorphous carbon 2 causes sliding resistance and wear amount during sliding operation with the mating member. Can be reduced.
[0022]
Therefore, the sliding bearing 1 in this embodiment has improved sliding characteristics, wear resistance, and strength, so that it can have a long life and high reliability.
[0023]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered. For example, in the above-described embodiment, the slide bearing 1 is exemplified by the amorphous carbon 2, the elastic body 3, and the metal sleeve 4. However, the plain bearing 1 can be configured by the amorphous carbon 2 alone. .
[0024]
【The invention's effect】
Since the plain bearing of the invention of claim 1 has a structure in which a fluorine-based resin film is formed on the surface of amorphous carbon, the strength is higher than that of the conventional product, and the sliding is caused by the fluorine-based resin film on the surface. Sliding resistance and wear during operation can be reduced. Therefore, the plain bearing of the present invention can have a long life and high reliability.
[0025]
Further, the sliding bearing according to the invention of claim 2 has a structure in which amorphous carbon is formed in a ring shape and is fitted to the inner periphery of the metal ring through an elastic body such as an elastomer. In addition to being able to relax, the load resistance can be improved, and even if the slide bearing is damaged, it is difficult for the fragments to come off from the inner periphery of the elastic body and metal ring. Until it is replaced, it can be used continuously in that state.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sliding bearing according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a rotary support structure using the sliding bearing of FIG.
1 Sliding bearing 2 Amorphous carbon 3 Elastic body 4 Metal sleeve 5 Fluorine resin film

Claims (4)

A plain bearing characterized by comprising amorphous carbon having a surface coated with a fluorine-based resin film. A plain bearing having a structure in which amorphous carbon whose surface is coated with a fluorine-based resin film is formed in an annular shape and is fitted to the inner or outer periphery of a metal ring through an elastic body. . The plain bearing according to claim 1 or 2,
The amorphous bearing is characterized in that the amorphous carbon is formed by heating and pressing and sintering a powder containing carbon as a main component and silicon and boron. The plain bearing according to claim 2,
A sliding bearing, wherein the elastic body is an elastomer.

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