Electrolytic corrosion-resistant rolling bearings

Abstract

This invention provides a rolling bearing that prevents electrolytic corrosion, allowing for easy and accurate measurement of the thickness of the insulating resin coating, and ensuring reliable insulation between the outer ring and the housing. [Solution] In a corrosion-resistant rolling bearing in which the outer ring outer surface 9 and the outer ring width surface 10 are coated with an insulating resin film 11, a resin-coated inner edge surface 12 is provided at one axial end of the inner circumference of the outer ring 1, which is connected to the radially inner end of the outer ring width surface 10, and a radial measurement reference surface 15 and an axial measurement reference surface 16 are formed between the resin-coated inner edge surface 12 and the outer ring shoulder surface 6.

Description

Technical Field

[0001] This invention relates to an anti-electric corrosion rolling bearing.

Background Art

[0002] As automobiles using an electric motor as a driving prime mover, electric vehicles such as EVs (battery electric vehicles) and HEVs (hybrid electric vehicles) are known. In these electric vehicles, in order to supply AC power to the electric motor, an inverter that converts the DC power of the battery into AC power is used, and in order to improve the efficiency of the electric motor, the frequency of the AC power supplied to the electric motor is set high.

[0003] Here, when the frequency of the AC power supplied to the electric motor increases, leakage magnetic flux is generated from the windings of the stator that constitutes the electric motor due to the influence of steep voltage fluctuations, and a potential difference occurs at both ends of the shaft. Therefore, current easily flows through the rolling bearing that supports the main shaft of the electric motor. And when current flows through the rolling bearing, a spark is generated between the raceway surface of the rolling bearing and the rolling elements, and a phenomenon (electric corrosion) in which damage to the raceway surface gradually progresses due to the spark may occur.

[0004] As rolling bearings capable of preventing this electric corrosion, those of Patent Documents 1 and 2 are known. The anti-electric corrosion rolling bearings of Patent Documents 1 and 2 have an outer ring, an inner ring disposed radially inside the outer ring, and a plurality of rolling elements incorporated between the outer ring and the inner ring. The outer ring has an outer ring raceway groove with which the rolling elements rollingly contact, a cylindrical outer ring shoulder surface formed adjacent to both axial sides of the outer ring raceway groove, a cylindrical outer ring outer peripheral surface formed on the outer periphery of the outer ring, and an outer ring width surface perpendicular to the axial direction formed at both axial ends of the outer ring. The outer ring outer peripheral surface and the outer ring width surface are coated with an insulating resin film.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] As described in Patent Documents 1 and 2, when mass-producing corrosion-resistant rolling bearings in which the outer ring circumferential surface and outer ring width surface are coated with an insulating resin film, it is necessary to measure the film thickness in order to control whether the resin film coated on the outer ring has the thickness specified in the design.

[0007] Here, one possible method for measuring the thickness of the resin coating applied to the outer ring is to use an electromagnetic film thickness gauge.

[0008] However, when measuring the thickness of a resin coating using an electromagnetic coating thickness gauge, it is necessary to press the probe of the electromagnetic coating thickness gauge against the resin coating, which may cause scratches on the resin coating. Furthermore, if the resin coating is thin (for example, when the thickness of the resin coating is about 10 to 50 μm), scratches on the resin coating may cause current to flow through the scratched area, potentially reducing the performance of preventing electrolytic corrosion.

[0009] Another possible method for measuring the thickness of the resin coating applied to the outer ring involves measuring the outer diameter and width dimensions of the outer ring's outer surface before and after coating, respectively, and then calculating the difference in dimensions before and after coating.

[0010] However, this measurement method may fail to detect if the thickness of the resin coating on only one of the outer ring width surfaces in the axial direction falls below the lower limit of the acceptable range, due to unevenness in the resin coating thickness. Furthermore, it requires two dimensional measurements—one before and one after the resin coating—which increases the workload and makes the process cumbersome.

[0011] Furthermore, the corrosion-resistant rolling bearings described in Patent Documents 1 and 2 do not have an insulating resin coating on the inner circumference of the outer ring. Therefore, when assembling the corrosion-resistant rolling bearing into the housing, if the outer ring width surface is abutted axially against a stopper surface formed on the inner circumference of the housing, the axial creepage distance between the inner circumference surface of the outer ring (which is not coated with an insulating resin) and the stopper surface on the inner circumference of the housing may be insufficient, potentially failing to ensure insulation between the outer ring and the housing.

[0012] The problem that this invention aims to solve is to provide a rolling bearing that prevents electrolytic corrosion, which allows for easy and accurate measurement of the thickness of the insulating resin coating and ensures reliable insulation between the outer ring and the housing. [Means for solving the problem]

[0013] To solve the above problems, this invention provides a corrosion-resistant rolling bearing with the following configuration. [Configuration 1] Outer ring and, An inner ring positioned radially inward of the outer ring, It has a plurality of rolling elements incorporated between the outer ring and the inner ring, The outer ring has an outer ring raceway groove into which the rolling elements roll and make contact, a cylindrical outer ring shoulder surface formed on at least one axial side of the outer ring raceway groove, a cylindrical outer ring outer surface formed on the outer circumference of the outer ring, and outer ring width surfaces formed at both axial ends of the outer ring that are perpendicular to the axial direction. In a corrosion-resistant rolling bearing in which at least one of the outer ring width surfaces and the outer ring outer surface are coated with an insulating resin film, The inner circumference of the outer ring is provided with an annular resin-coated inner edge surface that is connected to the radial inner end of the outer ring width surface and is coated with the resin film. A corrosion-resistant rolling bearing characterized in that, between the resin-coated inner edge surface and the outer ring shoulder surface, a cylindrical surface extending from the radially inner end of the resin-coated inner edge surface toward the axial center and not coated with the resin film is formed, and an annular surface perpendicular to the axial direction extending radially inward from the axial center end of the radially measuring reference surface and not coated with the resin film is formed, which is an axial measuring reference surface.

[0014] With this configuration, an axial measurement reference surface (an annular surface perpendicular to the axial direction that is not coated with a resin film) is provided on the inner circumference of the outer ring. By measuring the distance from this axial measurement reference surface to the surface of the resin film coated on the outer ring width surface, it is possible to easily and accurately measure the thickness of the resin film coated on the outer ring width surface.

[0015] Furthermore, since a radial measurement reference surface (a cylindrical surface extending in the axial direction that is not coated with a resin film) is provided on the inner circumference of the outer ring, the thickness of the resin film coated on the outer circumference of the outer ring can be easily and accurately measured by measuring the distance from this radial measurement reference surface to the surface of the resin film coated on the outer circumference of the outer ring.

[0016] Furthermore, since an annular resin-coated inner edge surface, which is continuous with the radial inner end of the outer ring width surface, is provided on the inner circumference of the outer ring, even when the outer ring width surface abuts axially against a stop surface formed on the inner circumference of the housing, it is possible to secure an axial creepage distance between the inner surface of the outer ring and the stop surface on the inner circumference of the housing, thereby ensuring insulation between the outer ring and the housing.

[0017] [Configuration 2] The corrosion-resistant rolling bearing according to configuration 1, wherein the resin-coated inner edge surface is composed of a cylindrical resin-coated cylindrical surface portion extending from the radially inner end of the outer ring width surface toward the axial center, and a resin-coated annular surface portion extending radially inward from the axial center end of the resin-coated cylindrical surface portion.

[0018] When this configuration is adopted, even if a part of the resin film coated on the inner edge surface of the resin coating peels off from the end, it is difficult to affect the axial creepage distance, and the insulation reliability between the outer ring and the housing is excellent. That is, since the inner edge surface of the resin coating is composed of a cylindrical resin coating cylindrical surface portion and a resin coating annular surface portion that extends radially inward from the end on the axial center side of the resin coating cylindrical surface portion, even if the end portion of the resin film coated on the inner edge surface of the resin coating, that is, peeling occurs in the resin film of the resin coating annular surface portion, as long as the peeling of the resin film does not reach the resin coating cylindrical surface portion, the axial length of the resin coating cylindrical surface portion can ensure the axial creepage distance. Therefore, even if a part of the resin film coated on the inner edge surface of the resin coating peels off from the end, it is difficult to affect the axial creepage distance, and the insulation reliability between the outer ring and the housing is excellent.

[0019] [Configuration 3] The anti-electric corrosion rolling bearing according to Configuration 1, wherein the inner edge surface of the resin coating is a concave conical surface with a straight cross-section that slopes radially inward from the radially inner end of the outer ring width surface toward the axial center side.

[0020] When this configuration is adopted, since the inner edge surface of the resin coating is a concave conical surface with a straight cross-section, it is easy to coat with a uniform film thickness when coating the resin film, and the film thickness management is easy.

[0021] [Configuration 4] The anti-electric corrosion rolling bearing according to Configuration 1, wherein the inner edge surface of the resin coating is a convex arc-shaped surface that smoothly connects between the outer ring width surface and the radial measurement reference surface.

[0022] [Configuration 5] The anti-electric corrosion rolling bearing according to Configuration 1, wherein the inner edge surface of the resin coating is a concave arc-shaped surface that connects between the outer ring width surface and the radial measurement reference surface.

[0023] [Configuration 6] The corrosion-resistant rolling bearing according to any one of configurations 1 to 5, wherein the resin-coated inner edge surface is a surface coated with the resin film to a position that extends 1 mm or more inward from the outer ring width surface toward the axial center.

[0024] By adopting this configuration, when the outer ring width surface abuts axially against the abutment surface formed on the inner circumference of the housing, an axial creepage distance of 1 mm or more can be secured between the inner circumference surface of the outer ring and the abutment surface on the inner circumference of the housing, thereby ensuring stable insulation between the outer ring and the housing.

[0025] [Composition 7] A corrosion-resistant rolling bearing according to any one of configurations 1 to 6, wherein the thickness of the resin coating is set to 10 to 50 μm.

[0026] By adopting this configuration, the thickness of the resin coating is 50 μm or less, which effectively suppresses peeling of the resin coating. [Effects of the Invention]

[0027] The corrosion-resistant rolling bearing of this invention allows for easy and accurate measurement of the thickness of the insulating resin coating, and ensures reliable insulation between the outer ring and the housing. [Brief explanation of the drawing]

[0028] [Figure 1] Cross-sectional view showing a corrosion-resistant rolling bearing according to the first embodiment of this invention. [Figure 2] Enlarged cross-sectional view of the vicinity of the outer ring width surface in Figure 1. [Figure 3] Figure 2 illustrates an example of a method for measuring the thickness of a resin coating. [Figure 4] This is an enlarged cross-sectional view showing the vicinity of the resin-coated inner edge surface of a corrosion-resistant rolling bearing according to a second embodiment of the present invention. [Figure 5] This is an enlarged cross-sectional view showing the vicinity of the resin-coated inner edge surface of a corrosion-resistant rolling bearing according to the third embodiment of this invention. [Figure 6]This is an enlarged cross-sectional view showing the vicinity of the resin-coated inner edge surface of a corrosion-resistant rolling bearing according to the fourth embodiment of this invention. [Modes for carrying out the invention]

[0029] Figure 1 shows a corrosion-resistant rolling bearing according to a first embodiment of the present invention. This corrosion-resistant rolling bearing comprises an outer ring 1, an inner ring 2 arranged coaxially radially inward of the outer ring 1, a plurality of rolling elements 3 mounted between the outer ring 1 and the inner ring 2 at circumferential intervals, and an annular cage 4 that maintains the circumferential intervals of the plurality of rolling elements 3. The outer ring 1, inner ring 2, and rolling elements 3 are each made of steel. In this case, the rolling elements 3 are balls.

[0030] Here, we define the direction parallel to the central axis of the outer ring 1 as the axial direction, one side of the axial direction (left side in the diagram) as the axial side, the opposite side of the axial direction (right side in the diagram) as the axial side, the side of the axial direction closer to the rolling element 3 as the axial center, the direction along the circumference that revolves around the central axis of the outer ring 1 as the circumferential direction, the direction approaching the central axis of the outer ring 1 as the radial inward direction, and the direction away from the central axis of the outer ring 1 as the radial outward direction.

[0031] The inner circumference of the outer ring 1 has an outer ring raceway groove 5 into which the rolling elements 3 roll and make contact, and a pair of outer ring shoulder surfaces 6 adjacent to the outer ring raceway groove 5 on both axial sides. The outer ring raceway groove 5 is formed in the axial center of the inner circumference of the outer ring 1. The outer ring raceway groove 5 is a groove with an arc-shaped cross-section perpendicular to the circumferential direction. The outer ring shoulder surfaces 6 are cylindrical inner circumferential surfaces formed on both sides that sandwich the outer ring raceway groove 5 in the axial direction. Of the outer ring shoulder surfaces 6 adjacent to one axial side of the outer ring raceway groove 5 (left side in the figure) and the outer ring shoulder surfaces 6 adjacent to the other axial side of the outer ring raceway groove 5 (right side in the figure), the outer ring shoulder surface 6 adjacent to one axial side of the outer ring raceway groove 5 (left side in the figure) faces radially opposite the outer circumference of the cage 4.

[0032] The outer circumference of the inner ring 2 has an inner ring raceway groove 7 into which the rolling elements 3 roll and make contact, and a pair of inner ring shoulder surfaces 8 adjacent to the inner ring raceway groove 7 on both sides in the axial direction. The inner ring raceway groove 7 is formed in the axial center of the outer circumference of the inner ring 2. The inner ring raceway groove 7 is a groove with an arc-shaped cross-section perpendicular to the circumferential direction. The inner ring shoulder surfaces 8 are cylindrical outer surfaces formed on both sides of the inner ring raceway groove 7 in the axial direction.

[0033] The outer ring 1 has a cylindrical outer ring surface 9 formed on its outer circumference, and outer ring width surfaces 10 perpendicular to the axial direction, formed at one end on the axial side (left side in the figure) and the other end on the axial side (right side in the figure). The outer ring 1 is symmetrical with respect to a virtual plane perpendicular to the axis passing through the axial center of the outer ring 1. Therefore, the configuration of one side of the outer ring 1 on the axial side will be described below, and the configuration of the other side on the axial side will be given the same reference numerals and its description will be omitted.

[0034] As shown in Figure 2, the outer ring outer surface 9 and the outer ring width surface 10 are coated with an insulating resin film 11. Examples of resins that can constitute the resin film 11 include polyamide-imide resin, polyamide resin, polyimide resin, fluororesin, isocyanate resin, silicone resin, furan resin, butyral resin, elastomer resin, epoxy resin, phenolic resin, urea resin, amino resin, and acrylic resin. The resin film 11 has a thickness of 10 to 50 μm and a dielectric strength of 0.01 kV / μm or higher. That is, the rolling bearing of this embodiment equipped with the resin film 11 has a dielectric strength of 0.1 kV or higher. Dielectric strength can be evaluated as the voltage at which dielectric breakdown does not occur, according to methods such as the Japanese Industrial Standard JIS C 2110-1:2016 "Solid electrical insulating materials - Test method for dielectric strength - Part 1: Test by application of commercial frequency AC voltage". Note that the thickness of the resin coating 11 is exaggerated in the diagram for ease of understanding; the actual thickness of the resin coating 11 is much thinner than shown in the diagram.

[0035] The inner circumference of the outer ring 1 is provided with a resin-coated inner edge surface 12 coated with a resin film 11 at one end on the axial side (left side in the figure). The resin-coated inner edge surface 12 is an annular surface that extends from the radially inner end (lower end in the figure) of the outer ring width surface 10. In this embodiment, the resin-coated inner edge surface 12 is an L-shaped annular surface composed of a cylindrical resin-coated cylindrical surface portion 13 extending from the radially inner end of the outer ring width surface 10 toward the axial center (right side in the figure), and a resin-coated annular surface portion 14 extending radially inward (downward in the figure) from the axial center end (right side in the figure) of the resin-coated cylindrical surface portion 13. The axial length of the resin-coated cylindrical surface portion 13 is set to be 1 mm or more, so that the resin-coated inner edge surface 12 is a surface coated with the resin film 11 up to a position that extends 1 mm or more inward from the outer ring width surface 10 toward the axial center (right side in the figure). The resin-coated annular surface portion 14 is an annular surface perpendicular to the axial direction in the figure.

[0036] Between the resin-coated inner edge surface 12 and the outer ring shoulder surface 6, a radial measurement reference surface 15 and an axial measurement reference surface 16 are formed. The radial measurement reference surface 15 is a cylindrical surface extending axially towards the center (right side in the figure) from the axially central side (right side in the figure) end of the resin-coated inner edge surface 12 (in this embodiment, the radially outer end of the resin-coated annular surface portion 14). The axial measurement reference surface 16 is an annular surface perpendicular to the axial direction, extending radially inward from the axially central side (right side in the figure) end of the radial measurement reference surface 15. The radial measurement reference surface 15 is a surface where the steel material constituting the outer ring 1 is exposed without being coated with the resin film 11, and similarly, the axial measurement reference surface 16 is also a surface where the steel material constituting the outer ring 1 is exposed without being coated with the resin film 11. The radial measurement reference surface 15 and the axial measurement reference surface 16 are formed by grinding (for example, plunge grinding). The radial inner end (lower end in the figure) of the axial measurement reference surface 16 is connected to the outer ring shoulder surface 6. The axial length of the radial measurement reference surface 15 is set to 1 mm or more, and the radial length of the axial measurement reference surface 16 is also set to 1 mm or more.

[0037] As shown in Figures 1 and 2, this corrosion-resistant rolling bearing can be assembled and used in a housing 17. As shown in Figure 2, the inner circumference of the housing 17 has a cylindrical inner fitting surface 18 that fits onto the outer ring outer surface 9 of the outer ring 1, and a stopper surface 19 that extends radially inward from the axial end of the inner fitting surface 18. The stopper surface 19 is an annular surface perpendicular to the axial direction, and the corrosion-resistant rolling bearing is assembled into the housing 17 by abutting the outer ring width surface 10 against this stopper surface 19 in the axial direction. The inner diameter of the stopper surface 19 is set to be smaller than the inner diameter of the outer ring width surface 10.

[0038] As shown in Figure 2, this corrosion-resistant rolling bearing has an annular resin-coated inner edge surface 12 that is connected to the radially inner end of the outer ring width surface 10 and is provided on the inner circumference of the outer ring 1. Therefore, even when the outer ring width surface 10 abuts axially against abutting surface 19 formed on the inner circumference of the housing 17, it is possible to ensure an axial creepage distance between the inner surface of the outer ring 1 and the abutting surface 19 on the inner circumference of the housing 17, thereby ensuring insulation between the outer ring 1 and the housing 17.

[0039] Furthermore, as shown in Figure 2, the resin-coated inner edge surface 12 of this corrosion-resistant rolling bearing is composed of a cylindrical resin-coated cylindrical surface portion 13 and a resin-coated annular surface portion 14 extending radially inward from the axial center side (right side in the figure) end of the resin-coated cylindrical surface portion 13. Therefore, even if peeling occurs in the end portion of the resin film 11 coated on the resin-coated inner edge surface 12, i.e., the resin film 11 on the resin-coated annular surface portion 14, as long as the peeling of the resin film 11 does not extend to the resin-coated cylindrical surface portion 13, the axial creepage distance can be secured by the axial length of the resin-coated cylindrical surface portion 13. For this reason, even if a part of the resin film 11 coated on the resin-coated inner edge surface 12 peels off from the end, it is less likely to affect the axial creepage distance, and the reliability of the insulation between the outer ring 1 and the housing 17 is excellent.

[0040] Furthermore, since the thickness of the resin coating 11 in this corrosion-resistant rolling bearing is 50 μm or less, it is possible to effectively suppress the peeling of the resin coating 11.

[0041] When mass-producing corrosion-resistant rolling bearings, it is necessary to measure the film thickness to control whether the resin coating 11 applied to the outer ring 1 has the thickness specified in the design.

[0042] Regarding the measurement of this film thickness, as shown in Figure 3, this corrosion-resistant rolling bearing has an axial measurement reference surface 16 (an annular surface perpendicular to the axial direction and not coated with resin film 11) on the inner circumference of the outer ring 1. Therefore, by measuring the distance A from the axial measurement reference surface 16 to the surface of the resin film 11 coated on the outer ring width surface 10, it is possible to easily and accurately measure the film thickness of the resin film 11 coated on the outer ring width surface 10.

[0043] Furthermore, since a radial measurement reference surface 15 (a cylindrical surface extending in the axial direction that is not coated with the resin film 11) is provided on the inner circumference of the outer ring 1, the thickness of the resin film 11 coated on the outer ring outer surface 9 can be easily and accurately measured by measuring the distance B from the radial measurement reference surface 15 to the surface of the resin film 11 coated on the outer ring outer surface 9.

[0044] In the above embodiment, the statement that the radial measurement reference surface 15 is a cylindrical surface does not require it to be a perfectly cylindrical surface in a mathematically strict sense, but rather includes surfaces that are inclined by 5° or less from a cylindrical surface in a mathematically strict sense. Similarly, the statement that the radial measurement reference surface 15 is perpendicular to the axial direction does not require it to be perfectly perpendicular in a mathematically strict sense, but rather includes surfaces that are inclined by 5° or less from a perpendicular surface in a mathematically strict sense.

[0045] Figure 4 shows a second embodiment of the present invention. The second embodiment differs from the first embodiment only in the configuration of the resin-coated inner edge surface 12; all other configurations are the same. Therefore, the parts corresponding to the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0046] The resin-coated inner edge surface 12 is a concave conical surface with a straight cross-section that slopes radially inward from the radially inner end (lower end in the figure) of the outer ring width surface 10 toward the axial center (right side in the figure). The axial width of the resin-coated inner edge surface 12 (i.e., the axial distance from the outer ring width surface 10 to the axial center side (right side in the figure) of the resin-coated inner edge surface 12) is set to a size of 1 mm or more, so that the resin-coated inner edge surface 12 is a surface coated with the resin film 11 up to a position that extends 1 mm or more inward from the outer ring width surface 10 toward the axial center (right side in the figure).

[0047] In this embodiment of the corrosion-resistant rolling bearing, the inner edge surface 12 of the resin coating is a concave conical surface with a straight cross-section, making it easy to coat the resin film 11 with a uniform thickness and easy to control the film thickness. It also has the same effects as the first embodiment.

[0048] Figures 5 and 6 show the third and fourth embodiments of this invention, respectively. The third and fourth embodiments differ from the second embodiment in the configuration of the resin-coated inner edge surface 12, but the other configurations are the same. Parts corresponding to the second embodiment are denoted by the same reference numerals and their description is omitted.

[0049] In Figure 5, the resin-coated inner edge surface 12 is a surface with a convex arc cross-section that smoothly connects the outer ring width surface 10 and the radial measurement reference surface 15. In Figure 6, the resin-coated inner edge surface 12 is a surface with a concave arc cross-section that connects the outer ring width surface 10 and the radial measurement reference surface 15. Even if these configurations are adopted, the same effects and advantages as in the first embodiment can be obtained.

[0050] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0051] 1 Outer ring 2 Inner ring 3 Rolling element 5 Outer ring raceway groove 6. Outer rim shoulder surface 9 Outer ring outer surface 10 Outer ring width surface 11 Resin coating 12 Resin-coated inner edge surface 13. Resin-coated cylindrical surface portion 14 Resin-coated annular surface portion 15 Radial measurement reference surface 16 Axial measurement reference plane

Claims

1. Outer ring (1) and, An inner ring (2) is positioned radially inward of the outer ring (1), It has a plurality of rolling elements (3) incorporated between the outer ring (1) and the inner ring (2), The outer ring (1) has an outer ring raceway groove (5) in which the rolling elements (3) roll and make contact, a cylindrical outer ring shoulder surface (6) formed on at least one axial side of the outer ring raceway groove (5), a cylindrical outer ring outer surface (9) formed on the outer circumference of the outer ring (1), and outer ring width surfaces (10) formed at both axial ends of the outer ring (1) that are perpendicular to the axial direction. In a corrosion-resistant rolling bearing in which at least one of the outer ring width surfaces (10) and the outer ring outer surface (9) are coated with an insulating resin film (11), The inner circumference of the outer ring (1) is provided with an annular resin-coated inner edge surface (12) that is connected to the radial inner end of the outer ring width surface (10) and is coated with the resin film (11). A corrosion-resistant rolling bearing characterized in that, between the resin-coated inner edge surface (12) and the outer ring shoulder surface (6), a cylindrical surface extending from the radial inner end of the resin-coated inner edge surface (12) toward the axial center and not coated with the resin film (11) is formed, and an annular surface perpendicular to the axial direction extending radially inward from the axial center end of the radial measurement reference surface (15) is formed, and not coated with the resin film (11) is formed, the galvanic corrosion-resistant rolling bearing.

2. The corrosion-resistant rolling bearing according to claim 1, wherein the resin-coated inner edge surface (12) is composed of a cylindrical resin-coated cylindrical surface portion (13) extending from the radially inner end of the outer ring width surface (10) toward the axial center, and a resin-coated annular surface portion (14) extending radially inward from the axial center end of the resin-coated cylindrical surface portion (13).

3. The corrosion-resistant rolling bearing according to claim 1, wherein the resin-coated inner edge surface (12) is a concave conical surface with a straight cross-section that slopes radially inward from the radially inner end of the outer ring width surface (10) toward the axial center.

4. The corrosion-resistant rolling bearing according to claim 1, wherein the resin-coated inner edge surface (12) is a surface with a convex arc cross-section that smoothly connects the outer ring width surface (10) and the radial measurement reference surface (15).

5. The corrosion-resistant rolling bearing according to claim 1, wherein the resin-coated inner edge surface (12) is a concave arc-shaped surface in cross-section connecting the outer ring width surface (10) and the radial measurement reference surface (15).

6. The electrocorrosion-preventing rolling bearing according to any one of claims 1 to 5, wherein the resin-coated inner edge surface (12) is a surface coated with the resin film (11) to a position that extends 1 mm or more inward from the outer ring width surface (10) toward the axial center.

7. The electrolytic corrosion-resistant rolling bearing according to any one of claims 1 to 5, wherein the thickness of the resin coating (11) is set to 10 to 50 μm.

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