JP2567304Y2 - Anti-corrosion rolling bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-corrosion rolling bearing, and more particularly, to an anti-corrosion rolling bearing capable of preventing electric corrosion between a race and a rolling element.

[0002]

2. Description of the Related Art For example, bearings used in electric motors such as traction motors for railway vehicles require insulating properties in order to prevent electrolytic corrosion between the bearing raceway surface and the rolling elements. As a countermeasure for preventing electrolytic corrosion, polyamide 66, polyamide 6, polybutylene terephthalate, polyethylene terephthalate, polyphenylene sulfide, or the like is coated or resin-molded on the outer peripheral surface of the bearing outer ring or the inner peripheral surface of the inner ring. Although some are known, there are some problems as measures for preventing electrolytic corrosion. That is, coating or injection molding of such a resin has a tendency that the insulating properties become worse as the temperature becomes higher and as it absorbs moisture. Therefore, when taking measures to prevent electrolytic corrosion on the outer ring or inner ring of the bearing, the coated resin itself is required to have high temperature resistance and moisture absorption resistance, and is further fitted with a predetermined interference so as to have creep resistance. Is required. As a conventional bearing for preventing electrolytic corrosion, for example, JP-A-3-277818 is characterized in that an insulating film is formed on the surface of a bearing ring, and the insulating film is formed of a polyphenylene sulfide resin containing glass fiber. An anti-corrosion rolling bearing has been proposed.

[0003]

As described above, since the anti-corrosion bearing is used mainly under severe conditions corresponding to railway vehicles and the like, further improvement in insulation properties is required. However, the use of only a resin as an insulating film has limitations in high-temperature resistance and creep resistance under severe conditions. The present invention has been made in view of such a problem, and its object is to provide an electrolytic corrosion-prevention rolling which is excellent in electric insulation resistance and creep resistance even under severe conditions and is hardly affected by temperature and humidity. It is to provide a bearing.

[0004]

In order to solve the above-mentioned problems, the present invention provides an anti-corrosion rolling bearing in which a resin insulating film is formed on the surface of a raceway of a bearing. A metal oxide film (6) is formed on a base metal surface of a fitting surface of the bearing ring, and the resin insulating film (7) is formed of a resin or a thermoplastic resin (7) such as polyphenylene sulfide resin; A thermosetting resin layer (8) is formed between the film and the oxide film (6).

[0005]

When the anti-corrosion rolling bearing is used as the above-mentioned means, the metal oxide film 6 has a strong rust-preventive force, has excellent insulation properties, and is hardly affected by temperature and humidity. Accordingly, the raceway becomes an outer ring having excellent electrical insulation properties together with the resin insulating film 7 coated on the metal oxide film 6 and has excellent insulation performance even under severe conditions such as a traction motor for a railway vehicle. It exhibits good creep resistance. Furthermore, a urethane-based resin film (for example, 2
When a liquid-reactive polyurethane is formed, the thermosetting resin is hardly affected by high temperature and high humidity, so that the insulating effect is further enhanced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the drawings. 1 is a partial cross-sectional view of the anti-corrosion rolling bearing 1 of the present invention, FIG. 2 is an enlarged view of a portion P in FIG. 1, FIG. 3 is an axial cross-sectional view before forming a resin insulating film 7, and FIG. It is an axial sectional view of the insulating film 7 part. This anti-corrosion rolling bearing 1 basically includes an outer ring 2, an inner ring 4 and a rolling element 3.
(Ball) and a retainer 5 for the rolling element 3. In particular, peripheral grooves 2a, 2a are formed on the surface of the outer ring 2, and a metal oxide film 6 is formed on the metal surface of the outer ring. That is, the metal oxide film 6 is formed on the base metal surface of the outer ring 2, a urethane resin film 8 of a thermosetting resin is formed, and then the thermoplastic resin insulating film 7 having the ridges 7a, 7a formed thereon. Is coated.

On both sides of the outer race 2, grooves 2b are formed.
2b is formed, and a resin to be an insulating film is also filled therein, a urethane-based resin film 8 of a thermosetting resin is formed, and then the thermoplastic resin insulating film 7 formed with ridges 7b and 7b is formed.
Is coated. Of course, a metal oxide film 6 is formed on the metal surface on both sides of the outer ring 2. As described above, the metal oxide film 6 is formed on the outer ring 2 after forming the circumferential grooves 2a, 2b and the like. As a metal material of the outer ring 2, SUJ-2 or stainless steel is used. The metal oxide film 6 is a phosphate film or an oxalate film, and the resin insulation film 7 is a resin layer such as polyamide or polyphenylene sulfide (PPS). In this case, if the PPS contains a suitable amount of glass fiber, The creep resistance is enhanced. As a method of forming the outer ring 2 composed of the four layers, the outer ring 2 in which the grooves 2a, 2b, etc. are formed and processed in advance is thoroughly cleaned and treated with a metal phosphate aqueous solution having a predetermined ratio. Thus, a metal oxide film 6 made of an insoluble metal phosphate is formed on the surface of the outer ring 2 by a chemical reaction.

After the metal oxide film 6 is formed, a thermosetting resin film 8 of a urethane resin and a polyamide or PPS are injection-molded. The surface condition of the metal oxide film (phosphate film) 6 is formed. Can have a rough surface depending on the processing method. Therefore, when the resin is molded from the metal oxide film 6, the oxide film and the resin adhere well, and the creep resistance can be further improved. When the metal material of the outer ring 2 is SUS440C, the metal oxide film 6 is preferably an oxalate film.

As described above, the metal oxide film 6 made of a metal phosphate has a strong rust-preventive effect, has excellent insulation properties, and is hardly affected by temperature and humidity. Therefore, the outer ring 2 becomes an outer ring having excellent electrical insulation properties together with the thermosetting resin film 8 and the resin insulating film 7 coated on the metal oxide film 6 and has a severe condition like a traction motor for a railway vehicle. Underneath, it exhibits excellent insulation performance and also has good creep resistance.

FIG. 5 shows an embodiment in which, as the anti-corrosion rolling bearing 1, circumferential grooves 4a, 4b and the like are formed and formed on the inner ring 4 side, a metal oxide film 6 is provided, and resin insulating films 7, 8 are formed. . FIG. 6 shows the circumferential grooves 2 a and 4 on both the outer ring 2 and the inner ring 4.
This is an embodiment in which the resin insulating films 7 and 8 are formed by providing metal oxide films 6 and 6 on the surface of the base metal by forming and processing a and the like. As described above, the anti-corrosion rolling bearing 1 according to the present invention may have a metal oxide film and a resin insulating film formed on one or both sides.

[0011]

[Effect of the Invention] Since the anti-corrosion rolling bearing of the present invention has the above-described structure, it is possible to prevent electric corrosion without being affected by temperature and humidity. And in the case of this invention, a metal oxide film is formed on the metal surface,
Further, since the thermosetting resin film and the thermoplastic resin insulating film are laminated, it is possible to almost completely prevent electrolytic corrosion.
Further, the method of forming a metal oxide film is a relatively simple process, and does not significantly increase the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of an anti-corrosion rolling bearing of the present invention.

FIG. 2 is an enlarged view of a part P in FIG.

FIG. 3 is an axial sectional view before a resin film of the present invention is formed.

FIG. 4 is an axial sectional view of the resin film itself according to the present invention.

FIG. 5 is a view showing an embodiment in which a peripheral groove is formed on the inner ring side, a metal oxide film is provided, and then a resin film is formed as the anti-corrosion rolling bearing of the present invention.

FIG. 6 is an embodiment diagram of a case in which a resin film is formed after forming a peripheral groove on both the outer ring and the inner ring and providing a metal oxide film as the anti-corrosion rolling bearing of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anti-corrosion rolling bearing 2 Outer ring 3 Rolling element 4 Inner ring 5 Cage 6 Metal oxide film 7 Thermoplastic resin insulating film 8 Thermosetting resin film

Claims (1)

(57) [Scope of request for utility model registration] An anti-corrosion rolling bearing comprising a bearing ring surface and a resin insulating film formed on the surface thereof, wherein the resin insulating film is formed of a thermoplastic resin such as polyamide resin or polyphenylene sulfide resin. An anti-corrosion rolling bearing, wherein a metal oxide film is formed on a surface of a base metal at a fitting surface, and a thermosetting resin layer is further formed between the resin insulating film and the metal oxide film.