JPH0538420U - Anti-corrosion rolling bearing - Google Patents

Abstract

(57) [Summary] [Purpose] As a method of providing insulating material on the outer ring of rolling bearings, rationalize the post-processing to treat the outer peripheral surface of the outer ring by providing the insulating material on the outer peripheral surface and the end surface of the outer ring separately. To reduce costs. [Structure] The rolling bearing has a ball 5 between the outer ring 1 and the inner ring 2.
The insulating coating 3 is fixed to the outer peripheral surface of the outer ring 1 by thermal spraying. An insulating side plate 11 or 12 is fixed to the end surface of the outer ring 1 with an adhesive. Before attaching the side plates 11 or 12, the insulating coating 3 is attached with a large number of outer rings and fixed at one time, and the post-processed rear side plate is attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an anti-corrosion type rolling bearing that is widely used for sliding parts of rotating equipment.

[0002]

[Prior Art]

 If electrical equipment is present in the surroundings of rolling bearings used in vehicle drive units, vehicle axle units, electric motors, etc., current may flow through the rolling elements to the outer and inner rings of the bearings. Since the contact points between the outer and inner races and the rolling elements are point or line contact, electric discharge occurs between them and they are locally melted, and so-called electrolytic corrosion reduces the bearing life.

In order to prevent such electrolytic corrosion, for example, the surface of the bearing which comes into contact with the outer ring is applied by a thermal spraying method or a molding process. An example of such a conventional technique is shown in FIG. Reference numeral 1 denotes an outer ring, 2 an inner ring, 3 an insulating coating, 4 an inner diameter surface of the outer ring, and 5 a ball.

[0004]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional electrolytic corrosion-preventing rolling bearing, the insulating coating 3 formed on the outer diameter surface and the end surface (side surface) is formed by thermal spraying or molding, but the coating surface has a finishing accuracy required for bearings. Since it cannot be obtained, post-processing is required. However, when performing this post-processing, a reference surface for processing is required, and in the case of the conventional bearing shape with an insulating coating, the outer ring inner diameter surface 4 is used as the reference, but the method using this inner diameter surface as the reference The post-machining method is limited, and the post-machining cannot be performed by the method using other reference planes.

Further, when forming a coating film by thermal spraying, if only the outer diameter surface is post-processed, the post-processing can be performed with a large number of outer rings arranged side by side, but the end surface is also sprayed. With such a shape, only one outer ring can be post-processed in one operation. Therefore, the time for fixing the outer ring to the thermal spraying machine also increases, which ultimately increases the product price.

This invention considers various problems in the electrolytic corrosion-preventing rolling bearing having the above-mentioned conventional insulating coating, and considers that the insulating material for the outer ring is made of different materials for the outer peripheral surface and the end surface. An object of the present invention is to provide a rolling bearing which can be processed in large quantities by providing an insulating coating only on the outer peripheral surface and a side plate on the end surface, and which has an electrolytic corrosion preventing function.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention has a structure of an electrolytic corrosion-prevention type rolling bearing in which an insulating coating is formed on the outer peripheral surface of an outer ring of a rolling bearing, and an insulating side plate is fixed to the end face of the outer ring through fixing means. I did.

In the solving means, the insulating side plate may be adhered to the outer ring end surface with an adhesive.

[0009]

[Action]

 Since the rolling bearing of this invention has the above-mentioned configuration, the function as a bearing and the function of preventing electrolytic corrosion can be the same as the conventional one. Since the insulating coating is formed only on the outer peripheral surface, the insulating coating is fixed to the outer peripheral surface by thermal spraying before mounting the side plate. In this case, a large amount of processing can be performed by spraying the insulating coating onto a large number of outer rings at once. In that case, the outer ring end surface becomes the reference surface.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a main sectional view of the rolling bearing of the first embodiment. The basic structure of the rolling bearing is the same as that of the conventional example, 1 is an outer ring, 2 is an inner ring, 3 is an insulating film, 4 is an inner diameter surface of the outer ring, and 5 is a ball. However, in this embodiment, the insulating coating 3 is provided only on the outer peripheral surface of the outer ring 1. In this case, the insulating coating 3 is fixed to the outer peripheral surface of the outer ring by thermal spraying.

Insulating side plates 11 or 12 are fixed to both end faces (side faces) of the outer ring 1 with an adhesive. The insulating side plate 11 has a larger inner diameter than 12 and may be used as the side plates 11 on both end faces in normal use. However, if it is desired to prevent foreign matter from entering the inside of the bearing, the side plate 12 should have a smaller inner diameter and the outer ring should be It is advisable to reduce the gap between the diameter and the side plate so that it also has the function of a sealing plate.

FIG. 2 shows a main sectional view of the second embodiment. The main constituent members 1 to 5 are the same as in the first embodiment. This embodiment is different in that the side plate fixing method by fitting is adopted instead of the insulating side plate fixing method by the adhesive of the first embodiment. The insulating side plate 13 has a boss portion 14 on the inner diameter hole side, and is formed to have a diameter that fits into the inner diameter surface of the outer ring 1 by press fitting or clearance fitting. In this embodiment, since the adhesive is not used, the side plate can be securely fixed without causing the adhesion failure or the peeling due to the secular change of the adhesive, and the bonding work can be omitted.

The rolling bearings of any of the embodiments configured as described above have the same functions as a bearing and a function for preventing electrolytic corrosion, which are completely the same as conventional ones. When the bearing of any one of the above-described embodiments is used, it is not necessary to spray the insulating coating on the end face of the outer ring, and the end face of the outer ring can be used as a reference in post processing. By providing an insulating side plate on the outer ring end face, electrolytic corrosion can be reliably prevented.Before mounting the side plate on this end face, a large number of outer rings are arranged side by side with the outer ring end face as a reference, and the outer peripheral face of the outer ring is arranged. If thermal spraying is applied at once, large-scale processing is possible and cost is reduced.

[0014]

【effect】

 As described in detail above, in the rolling bearing of this invention, the insulating coating is formed only on the outer peripheral surface of the outer ring, and the end surface is fixed with the insulating side plate through the fixing means. The outer rings are arranged adjacent to each other, and an insulating coating can be formed on the outer peripheral surface by a single thermal spraying process, enabling large-scale processing, reducing costs, and providing the same electrolytic corrosion effect as before. The advantage is obtained.

[Brief description of drawings]

FIG. 1 is a main sectional view of an electrolytic corrosion-preventing rolling bearing according to an embodiment.

FIG. 2 is a main sectional view of an electrolytic corrosion preventing rolling bearing of a second embodiment.

FIG. 3 is a main cross-sectional view of a conventional example of an electrolytic corrosion-preventing rolling bearing.

FIG. 4 is an explanatory diagram of a method for forming an insulating film.

[Explanation of symbols]

 1 Outer ring 2 Inner ring 3 Insulating coating 4 Outer ring inner diameter surface 5 Ball 11 Insulating side plate 12 Insulating side plate 13 Insulating side plate

Claims (2)

[Scope of utility model registration request] 1. An electrolytic corrosion-prevention type rolling bearing in which an insulating coating is formed on an outer peripheral surface of an outer ring of a rolling bearing, and an insulating side plate is fixed to an end face of the outer ring through a mounting means. 2. The anti-corrosion rolling bearing according to claim 1, wherein the insulating side plate is adhered to the end face of the outer ring with an adhesive.