JP3036966B2 - Manufacturing method of rolling bearing for preventing electrolytic corrosion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rolling bearing for preventing electrolytic corrosion, which is used in an environment where electrolytic corrosion can occur, such as a bearing for a motor of a railway vehicle.

[0002]

2. Description of the Related Art In general, in a railroad vehicle running with electric power such as an electric locomotive or an electric passenger train as a power source, a ground for grounding a leakage current to prevent vehicle components from being damaged by a current leaking from the motor. The current collector is provided between the vehicle body and the axle, but when a small amount of leakage current flows through the rolling bearing that supports the axle to the wheels and rails, the leakage current causes the rolling bearing Between the rolling element and the rolling surface of the outer ring or the inner ring,
This may cause so-called electrolytic corrosion and cause wear of the bearing.

[0003] As a countermeasure against such electrolytic corrosion, FIG.
As shown in FIG. 1, there is known an outer ring (11) in which an insulating coating (12) made of ceramic or the like is formed on the outer diameter surface and both width surfaces. With such an insulating coating (12), the outer ring (1
Since 1) and the outside of the bearing are electrically insulated, it is possible to prevent the occurrence of electrolytic corrosion in the bearing.

Conventionally, such an insulating film (12) has been
As shown in (a), the outer ring (11) is formed by spraying ceramic onto the outer diameter surface and the width surface of the outer ring (11) while masking the inner diameter surface with a masking member (13).
The masking member (13) is formed by integrating a pair of spaced cylindrical members (14) with a shaft member (15).

[0005]

However, during the above-mentioned thermal spraying operation, since the ceramic material tends to accumulate at the boundary between the outer ring (11) and the masking member (13), it is shown in the enlarged view of FIG. Insulation coating (1
Burrs (16) may occur in 2). Since such burrs (16) are chipped by even a slight impact, the insulating coating (12) around the burrs (16) may be partially peeled off.

Therefore, an object of the present invention is to prevent partial peeling of an insulating film and improve insulating properties.

[0007]

In order to achieve the above object,
In the present invention, when forming the ceramic insulating coating on the outer diameter surface and the width surface of the bearing outer ring, a shaving allowance is provided on the inner diameter surface of the bearing outer ring, and the outer diameter surface of the bearing outer ring and the width surface of the bearing outer ring including the cutting allowance. After forming a coating by spraying an insulating material on the inner surface of the bearing, the shaving allowance is cut off to process the inner diameter surface of the bearing outer ring to a predetermined diameter.

[0008]

According to such a procedure, the burrs generated during the thermal spraying of the insulating material are cut off together with the cutting allowance. Therefore, after the excision, an insulating coating free of burrs is formed on the outer diameter surface and the width surface of the outer ring. As a result, it is possible to prevent partial peeling of the insulating film due to chipping of burrs.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rolling bearing for preventing corrosion according to an embodiment of the present invention; FIG.

First, for example, an outer ring (1) of a cylindrical roller bearing
Is formed by means such as forging. During this molding process,
As shown in FIG. 1, the inner diameter (r) is made slightly smaller than the inner diameter (R) at the time of completion to form an annular cutting allowance (2). Hereinafter, the inner diameter line at the time of completion is referred to as a reference line (L), which is indicated by a dotted line. Subsequently, the rolling surface and the flange surface are processed through turning, heat treatment, and grinding processes.

Next, the outer ring (1) is conveyed to a thermal spraying device, and as shown in FIG.
Ceramics are sprayed on the outer diameter surface and the width surface while masking with the above to form an insulating coating (4). The masking member (3) used here is formed by arranging a pair of cylindrical members (5) having a stepped structure provided with a small diameter portion (5a) and a large diameter portion (5b). Step (6) of cylindrical member (5)
Are provided at positions where they can be in contact with the tapered surfaces (7) provided at both ends of the outer ring (1) when mounted on the outer ring (1). The step (s) between the two step portions (6) is formed smaller than the thickness (t) of the cutting allowance (2). Therefore, when the masking member (3) is attached to the outer ring (1),
The reference line (L) is located on the outer diameter side of the step (6), and a part of the width of the cutting allowance (2) is exposed from the step (6). When a ceramic spraying operation is performed in such a state, as shown in FIG. 3, an insulating film (4) is formed on a part of the width surface of the cutting allowance (2) beyond the reference line (L).

Subsequently, the cutting allowance (2) of the outer ring (1) is ground until it reaches the reference line (L). As a result, FIG.
As shown in (a), the outer ring (1) is completed to the desired shape and dimensions. At this time, since the burrs generated in the thermal spraying operation are also ground together with the shaving allowance (2), no burrs remain on the insulating coating (4) as shown in an enlarged view in FIG. Therefore, there is no possibility that the insulating coating (4) is partially peeled off due to chipping of burrs, and the insulating property is improved.

The tapered surfaces (7) provided at both ends of the outer ring (1) have a function of suppressing leakage current from flowing into the inside of the bearing from the inner diameter surface of the outer ring (1). The present invention is applicable not only to the outer ring (1) provided with the tapered surface (7) as described above, but also to the manufacturing process of the outer ring (1) not provided with the tapered surface (7) as shown in FIG.

The outer peripheral surface of the cylindrical member (5) constituting the masking member (3) may be a smooth surface without the step (6). However, in this case, the insulating film (4) made of hard ceramic is formed over the entire width of the shaving allowance (2), so that it is difficult to grind the shaving allowance (2). There is a need.

Although the above description relates to a cylindrical roller bearing, the present invention is not limited to this.
It can be applied to various types of rolling bearings such as ball bearings.

[0016]

As described above, according to the present invention, burrs do not remain on the insulating coating formed on the outer race of the bearing, so that the insulating coating does not partially peel off and the insulation can be improved. . Therefore, it is possible to improve the life of a rolling bearing used in an environment where electric corrosion can occur, such as a motor bearing of a railway vehicle.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is a sectional view showing an embodiment of the present invention.

FIG. 4A is a sectional view showing an embodiment of the present invention, and FIG. 4B is an enlarged view of a main part thereof.

FIG. 5 is a cross-sectional view of an outer ring in which an insulating film is formed on an outer diameter surface and a width surface.

FIG. 6A is a cross-sectional view showing a conventional thermal spraying process of an insulating film, and FIG. 6B is an enlarged view of a main part thereof.

[Description of Signs] 1 Bearing outer ring 2 Shaving allowance 4 Insulating coating

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 33/58 F16C 35/077 F16C 33/64

Claims (1)

(57) [Claims] When forming a ceramic insulating film on an outer diameter surface and a width surface of a bearing outer ring, a cutting allowance is provided on an inner diameter surface of the bearing outer ring, and the outer diameter surface of the bearing outer ring and a width surface of the bearing outer ring including the cutting allowance. After spraying the insulating material to form a coating,
A method for manufacturing a rolling bearing for preventing electrolytic corrosion, comprising cutting off the shaving allowance and processing the inner diameter surface of the bearing outer ring to a predetermined diameter.