JPS63259216A - Rolling bearing - Google Patents

Abstract

PURPOSE:To make it possible to prevent generation of remarkable corrosion of each part by covering at least one face of the inside periphery of an inner ring and the outside periphery of an outer ring by means of an insulating sheet. CONSTITUTION:An insulating sheet 6 is attached to the inside periphery 1a and both end faces 1b, 1b of an inner ring 1 which is made, in a short cylinder shape, of metal materials such as bearing steel, etc., so as to cover each face 1a, 1b. This insulating sheet 6 is made by impregnating a fabric-shaped sub stance, which is constituted of woven filament made of insulating material such as tetrafluoroethylene, etc., and has a thickness of about 0.3-0.6mm, with resin and drying the substance into about 0.4mm in thickness. Accordingly, by the existence of the insulating sheet 6, it becomes possible to prevent the current from flowing into each constituent part.

Description

Detailed Description of the Invention a0 Object of the Invention (Industrial Field of Application) The rolling bearing according to the present invention is used by being installed in a part where an electric current flows, such as supporting the rotating shaft of various electrical devices.

(Prior art) Rolling bearings are used to support the rotating shafts of various electrical devices, such as the rotating shafts of vehicle main motors. If you don't take lessons,
Current such as return current and motor shaft current flows through the rolling shaft receiver itself.

When current flows through a rolling bearing, corrosion progresses in the portion where the current passes, so-called galvanic corrosion, which significantly shortens the life of the rolling bearing.

In order to prevent the occurrence of such electrolytic corrosion, a technology was developed in JP-A-59-10 to prevent current from flowing through the rolling bearing by forming an insulating layer on the surface of the outer ring and inner ring that make up the rolling bearing.
It is disclosed in Japanese Utility Model Publication No. 3023 and Japanese Utility Model Application Publication No. 60-85626.

That is, the technique disclosed in Japanese Patent Application Laid-Open No. 59-103023 has a structure in which the outer circumferential surface of the inner ring 1 and the outer ring 2 are
In a rolling bearing in which a plurality of rolling elements 4.4 are interposed in an annular gap 3 formed between the inner circumferential surface 1a and the end surfaces 1b and lb of the inner ring 1 (Fig. example), or by forming a thermally sprayed layer 5 of an inorganic compound on the outer circumferential surface 2a and end surfaces 2b, 2b (example shown in Fig. 4) of the outer ring 2, current will not flow through the parts that make up the rolling bearing. I'm doing it like that.

Further, Japanese Utility Model Application Publication No. 60-85626 discloses a technique in which insulation is improved by using ceramic as an inorganic compound and impregnating minute gaps in the ceramic sprayed layer with a synthetic resin.

(Problems to be Solved by the Invention) However, in the case of the conventional insulated rolling bearing as described above, the inner peripheral surface 1a and end surface tb of the inner ring 1.

1b, the outer peripheral surface 2a'EL of the outer ring 2, and the end surface 2b.

The process of forming the insulating thermal sprayed layer 5 on the thermal sprayed layer 5 is troublesome, and the ceramic forming the thermal sprayed layer 5 itself is expensive, so the rolling bearing itself inevitably becomes expensive.

Furthermore, in ceramic thermal spraying, the metal inside the so-called gun, which is a part of the thermal spraying equipment, is scraped off during thermal spraying, and the metal powder mixed into the ceramic is present in the thermal sprayed layer, so the insulation of the thermal sprayed layer is affected. Sex was not always sufficient.

The rolling bearing of the present invention eliminates the above-mentioned disadvantages.

b0 Structure of the Invention (Means for Solving the Problem) The rolling bearing of the present invention, as in the case of conventional rolling bearings, has an annular gap formed between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring. A plurality of rolling elements are interposed therein to allow relative rotation between the inner ring and the outer ring.

Furthermore, in the rolling bearing of the present invention, at least one of the inner peripheral surface and end surface of the inner ring and the outer peripheral surface and end surface of the outer ring is coated with resin on a cloth-like material made of a non-conductive material. Covered with an impregnated insulation sheet.

(Function) The function itself when the rolling bearing of the present invention configured as described above rotatably supports a rotating shaft or the like is the same as that of a conventional rolling bearing.

However, in the case of the rolling bearing of the present invention, at least one of six surfaces, the inner circumferential surface and end surface of the inner ring, and the outer circumferential surface and end surface of the outer ring, is covered with an insulating sheet. There is no flow, and significant corrosion does not occur in some of the above parts due to electrolytic corrosion.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

1 and 2 show a first embodiment of the present invention, in which FIG. 1 is a sectional view of an inner ring constituting a rolling bearing, and FIG. 2 is a view taken in the direction of arrow A in FIG. 1.

An insulating sheet 6 is adhered to the inner peripheral surface 1a and both end surfaces tb, tb of the inner ring 1, which is made of a metal material such as bearing steel and has a short cylindrical shape, to cover each surface 1a, 1b. .

This insulating sheet 6 is made of tetrafluoroethylene (TFE).
), etc., made of braided filaments made of insulating material with a thickness of 0
．． A cloth-like material of about 3 to 0.6 mm is impregnated with a resin such as butyral-modified phenol, and further pressurized to impregnate the resin into the minute gaps in the monofilament, and then dried to a thickness of, for example, 0.4 ma. It is based on the degree.

Such an insulating sheet 6 can be attached to the inner ring by using an adhesive or by pressing the surface to which the insulating sheet 6 is to be attached with a force of, for example, 100 kgf/cm2 while heating it to about 60 to 80°C. 1, but a large number of cuts 7.7 are formed at equal intervals in the portion that protrudes from the inner peripheral surface 1a and covers both end surfaces 1b, lb. Therefore, the protruding portion 8 from the inner circumferential surface 1a is bent in the outer circumferential direction so as to cover both end surfaces 1b, 1b.

If necessary, the gap 9.9 formed at the cut 7.7 is filled with resin after pasting the insulating sheet 6.
This gap portion 9.9 is insulated.

Next, FIG. 3 shows a second embodiment of the present invention.

In the case of this embodiment, the outer peripheral surface 2a and both end surfaces 2b, 2b of the outer ring 2 constituting the rolling bearing are covered with an insulating sheet 6.

The material of the insulating sheet 6 is the same as that of the first embodiment, but the protruding portions 10 protruding from the outer circumferential surface 2a on both sides of the insulating sheet 6 are bent from the outer circumferential surface 2a in the inner circumferential direction. It covers both end surfaces 2b, 2b of the outer ring 2. Although not shown in the drawings, a large number of ■-shaped notches are formed at equal intervals in the protruding portion 10, and by bending it in the inner circumferential direction, the protruding portion 10 that covers both end surfaces 2b, 2b of the outer ring 2 is formed. I try not to get too close to myself.

As described above, the inner ring 1 has the inner circumferential surface 1a and both end surfaces 1b, 1b covered with the insulating sheet 6, or the outer ring 2 has the outer circumferential surface 2a and both end surfaces 2b, 2b covered with the insulating sheet 6. Although it is assembled and used in the same manner as a conventionally well-known rolling bearing, the presence of the insulating sheet 6 prevents current from flowing through each component.

In each of the above embodiments, the inner circumferential surface fa of the inner ring 1,
Or a protruding portion 8 protruding from the outer peripheral surface 2a of the outer ring 2
．． 10 is bent to cover each end surface Ib, 2b, but the insulating sheet 6 that covers the end surfaces Ib, 2b in this way is separate from the part that covers the inner circumferential surface 1a or the outer circumferential surface 2a. It's good as well.

If the dimensions of the rolling bearing become undefined by covering each surface with the insulating sheet 6, the surface of the insulating sheet 6 is polished after the insulating sheet 6 is attached.

C6 Effects of the Invention The rolling bearing of the present invention is configured and operates as described above, but since the insulating sheet 6, which is a cloth-like material impregnated with resin and further dried, can be obtained at a relatively low cost, it is suitable for electric motors, etc. , will not cause galvanic corrosion even if installed in a part where electric current flows.
It is possible to reduce the manufacturing cost and improve the reliability of a rolling bearing that prevents electrolytic corrosion.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, in which FIG. 1 is a sectional view of an inner ring constituting a rolling bearing, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. A sectional view of an outer ring showing a second embodiment of the invention, and Figures 4 and 5 show two examples of conventional rolling bearings.
Each is a partial sectional view. 1: Inner ring, 1a: Inner peripheral surface, 1b: End surface, 2: Outer ring, 2a
: outer peripheral surface, 2b: end surface, 3: gap, 4: rolling element, 5: sprayed layer, 6: insulation sheet, 7: cut, 8: protruding part,
9: Gap portion, 10: Protruding portion.

Claims (3)

[Claims] (1) In a rolling bearing in which a plurality of rolling elements are interposed in an annular gap formed between the outer circumferential surface of the inner ring and the inner circumferential surface of the outer ring, the inner circumferential surface and end surface of the inner ring and the outer ring A rolling bearing characterized in that at least one of the outer peripheral surface and end surface of the bearing is covered with an insulating sheet made of a cloth-like material made of a non-conductive material and impregnated with resin. (2) The rolling bearing according to claim 1, wherein the insulating sheet is attached with an adhesive. (3) The rolling bearing according to claim 1, wherein the insulating sheet is attached by being heated and pressurized.