Bearing seal

Abstract

To suppress an increase in rotating torque of a rolling bearing, suppress an increase in manufacturing cost, and stabilize contact for energization in a bearing seal that prevents electric corrosion of the rolling bearing.SOLUTION: A seal ring 2 of a bearing seal 1 has an elastic body 4 made of a rubber material. An electrically conductive texture part A where conductive fibers 5 are integrated and some of the conductive fibers 5 is exposed is formed on a surface layer part at one surface side of the elastic body 4. Each of an outer diameter side conductive texture part A1 as an outer diameter side portion of the conductive texture part A positioned in an outer peripheral part 8 of the elastic body 4 and an inner diameter side conductive texture part A2 as an inner diameter side portion of the conductive texture part A positioned in an inner peripheral part 9 of the elastic body 4 is of a circumferential intermittent type I intermittent in a circumferential direction C. The outer diameter side conductive texture part A1 comes in contact with an outer ring of a rolling bearing, and the inner diameter side conductive texture part A2 comes in contact with an inner ring of the rolling bearing.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a bearing seal that prevents electrolytic corrosion of a rolling bearing. [Background technology]

[0002] For example, current may leak into the rotating shaft in motors and reduction gear units of electric vehicles, as well as inverter-driven motors other than those for electric vehicles. In such cases, the lubricating oil film in the rolling bearing supporting the rotating shaft may be broken, causing current to flow between the outer and inner rings, resulting in arc damage to the rolling surfaces of the rolling elements.

[0003] As a bearing seal for preventing electrolytic corrosion in such rolling bearings, there is one that is provided with a sheet-like electrically conductive material for providing electrical conductivity between the outer ring and the inner ring (for example, electrically conductive material 3 which is a plate or foil material in Figure 2 of Patent Document 1, and (first) sheet 43 made of nonwoven or woven fabric made of conductive fibers in Figures 2-3 of Patent Documents 2-3).

[0004] The electrically conductive material 3 in Patent Document 1 is coated on or bonded to the surface of the elastic body B (page 2, upper right column, lines 11-12 of Patent Document 1). The sliding member 15 including the sheet 43 in Patent Documents 2 and 3 is manufactured by compression molding in which a core material 41, a sheet 43, and unvulcanized rubber G are accommodated in a molding die and pressurized and heated (for example, paragraphs

[0044] -

[0047] and Figure 4 of Patent Document 2), and the rubber G becomes the elastic material 42 (for example, Figures 1-3 of Patent Document 2).

[0005] Sheet 43, which is made of nonwoven or woven fabric made of conductive fibers, is not only present on the surface of elastic material 42 but also penetrates into elastic material 42 (FIG. 2-3). Elastic material 42 is conductive rubber (see, for example, paragraphs

[0031] and

[0043] of Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 62-106125 [Patent Document 2] International Publication No. 2023 / 233649 [Patent Document 3] International Publication No. 2023 / 233652 Summary of the Invention [Problem to be solved by the invention]

[0007] The sheet-like electrically conductive material in Patent Documents 1 to 3 is annular, and its inner diameter side portion is continuous in the circumferential direction. The elastic body is attached to the sheet-like electrically conductive material (for example, Figure 2 of Patent Document 1 and Figure 3 of Patent Documents 2 to 3). Therefore, the entire circumference of the inner diameter side portion of the sheet-like electrically conductive material (for example, sliding portion 46 in Figure 3 of Patent Document 2), which has a reinforcing effect on the elastic body, comes into contact with the inner ring of the rolling bearing. This increases the clamping force on the inner ring, and therefore the rotational torque of the rolling bearing.

[0008] The sheet 43, which is the sheet-like electrically conductive material in Patent Documents 2-3, is made of a nonwoven fabric or a woven fabric made of conductive fibers as described above. When the sliding member 15 including the sheet 43 is manufactured by the compression molding, the unvulcanized rubber material G is filled into the cavities 52a, 52b of the lower mold 52 through the voids in the sheet 43 made of the nonwoven fabric or the like (for example, paragraph

[0046] of Patent Document 2 and Figure 4 of Patent Document 2).

[0009] Because the unvulcanized rubber material G must be able to pass through the gaps in the nonwoven fabric sheet 43, the density of the nonwoven fabric cannot be high, and so the density of the nonwoven fabric that can be used is limited. This means that contact between the sheet 43 and the outer ring 11 and between the sheet 43 and the inner ring 12 is unstable. Furthermore, it is difficult to control the thickness of the nonwoven fabric, and there is a risk that the nonwoven fabric will be cut when the unvulcanized rubber material G is passed through. If the nonwoven fabric is cut, it will be embedded inside the elastic material 42, making it impossible to confirm whether the nonwoven fabric has been cut. Therefore, it is necessary to check the electrical conductivity of all bearing seals.

[0010] The fixed portion 45 on the outer diameter side of the sheet 43, which is the sheet-like electrically conductive material of Patent Documents 2-3, has a fourth portion 45b that is curved from the radial direction toward the axial direction, which is a direction parallel to the central axis of rotation of the rolling bearing, and the tip of the fourth portion 45b contacts the outer ring 11 of the rolling bearing 10 (for example, paragraph

[0034] and Figure 2 of Patent Document 2).

[0011] Most of the fixed portion 45 is covered by the elastic material 42 (see, for example, paragraph

[0040] and Figure 2 of Patent Document 2), and molding the curved fourth portion 45b of the sheet 43 embedded inside the elastic material 42 into a desired shape requires control of the flow of the pre-vulcanized rubber in the molding die and adjustment of the strength of the nonwoven fabric, etc. Furthermore, it is difficult to make the nonwoven fabric, etc. conform to the molding die due to the circumferential stretch that occurs when the nonwoven fabric, etc. is deformed. Therefore, the molding becomes more difficult, and the manufacturing costs increase.

[0012] Since sheet 43 is made of a nonwoven or woven fabric made of conductive fibers (for example, paragraph

[0032] of Patent Document 2), when sheet 43 is molded in the molding die so that fourth portion 45b on the outer diameter side is curved, contraction occurs in the inner diameter direction around curved fourth portion 45b and expansion occurs in the outer diameter direction around curved fourth portion 45b, resulting in an uneven density of the conductive fibers. As a result, contact for electrical conduction between the tip of fourth portion 45b and outer ring 11 of rolling bearing 10 is unstable.

[0013] The present invention aims to provide a bearing seal that prevents electrolytic corrosion of a rolling bearing by suppressing an increase in the rotational torque of the rolling bearing, suppressing an increase in manufacturing costs, and stabilizing contact for electrical conduction. [Means for solving the problem]

[0014] A bearing seal according to a first aspect of the present invention is a bearing seal including an annular seal ring for use in a rolling bearing including an outer ring, an inner ring, and rolling elements. The seal ring has an elastic body made of a rubber material. A surface layer on one surface of the elastic body is formed with conductive fibers integrated therein, with a conductive texture portion formed with some of the conductive fibers exposed from the surface. The outer diameter side conductive texture portion, which is the outer diameter side portion of the conductive texture portion located on the outer circumference of the elastic body, and the inner diameter side conductive texture portion, which is the inner diameter side portion of the conductive texture portion located on the inner circumference of the elastic body, are either circumferentially discontinuous, or circumferentially separated, with radial cuts made at predetermined circumferential intervals. The outer diameter side conductive texture portion contacts the outer ring, and the inner diameter side conductive texture portion contacts the inner ring.

[0015] A bearing seal according to a second aspect of the present invention is a bearing seal including an annular seal ring for use in a rolling bearing including an outer ring, an inner ring, and rolling elements. The seal ring has a core having an engagement portion that engages with the outer ring, and an elastic body made of a rubber material joined to the core. A surface layer on one surface of the elastic body is formed with conductive fibers integrated therein, and a conductive texture portion is formed in which some of the conductive fibers are exposed from the surface. The inner diameter side conductive texture portion, which is the inner diameter side portion of the conductive texture portion located on the inner peripheral portion of the elastic body, is a circumferentially discontinuous type that is discontinuous in the circumferential direction, or a circumferentially separated type that has radial notches at predetermined circumferential intervals. The outer diameter side conductive texture portion, which is the outer diameter side portion of the conductive texture portion located on the outer peripheral portion of the elastic body, contacts the core, and the inner diameter side conductive texture portion contacts the inner ring.

[0016] In the bearing seal according to the first or second aspect, the conductive texture portion that has a reinforcing effect on the elastic body is the circumferentially discontinuous type or the circumferentially separated type, and therefore the reinforcing effect of the inner diameter side conductive texture portion on the elastic body is suppressed, and the tightening force applied to the inner ring with which the inner diameter side conductive texture portion comes into contact can be reduced, so that the rotational torque of the rolling bearing does not increase.

[0017] In the bearing seal according to the first or second aspect, the conductive texture portion comprises conductive fibers integrated into a surface layer on one surface of an elastic body made of a rubber material, with portions of the conductive fibers exposed from the surface. Therefore, when molding, for example, by direct pressure molding, there is no need for the pre-vulcanized rubber to pass through a predetermined-shaped sheet of conductive fibers in the form of a cloth or nonwoven fabric, so there is no limit to the density of the conductive fibers that can be used, and the density can be increased. This stabilizes contact between the conductive texture portion and the outer ring and the inner ring, or between the conductive texture portion and the core and the inner ring. Furthermore, the conductive fibers are not cut by the pre-vulcanized rubber.

[0018] In the bearing seal according to the first aspect, the conductive texture portion that has a reinforcing effect on the elastic body is the outer diameter side conductive texture portion that contacts the outer ring of the rolling bearing, and is the circumferentially discontinuous type or the circumferentially separated type. Also, the conductive texture portion has conductive fibers integrated into a surface layer on one surface of the elastic body, with some of the conductive fibers exposed from the surface.

[0019] As a result, even if the outer diameter side conductive texture portion is curved in the axial direction, it is not necessary to control the flow of pre-vulcanized rubber within the molding die or adjust the strength of the predetermined shaped sheet of conductive fibers that will become the outer diameter side conductive texture portion, and the sheet can be easily fitted to the molding die. Therefore, molding difficulty is not increased, and manufacturing costs are not increased. Furthermore, since shrinkage in the inner diameter direction and expansion in the outer diameter direction of the outer diameter side conductive texture portion are suppressed when the outer diameter side conductive texture portion is molded to be curved within the molding die, non-uniform conductive fiber density is maintained, resulting in stable electrical contact with the outer ring.

[0020] In the bearing seal according to the second aspect, the outer diameter side conductive texture portion contacts the core bar, and the engagement portion of the core bar contacts the outer ring of the rolling bearing, thereby stabilizing electrical contact between the conductive texture portion and the core bar, and between the core bar and the outer ring. [Effects of the Invention]

[0021] As described above, the bearing seal according to the present invention is a bearing seal that prevents electrolytic corrosion of a rolling bearing, and can suppress increases in the rotational torque of the rolling bearing and increases in manufacturing costs, while also stabilizing contact for electrical conduction. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is an enlarged longitudinal sectional view of a main portion of a rolling bearing provided with a bearing seal according to an embodiment of the present invention. [Figure 2] This is an oblique view showing the inner side of the width direction of a bearing seal according to an embodiment of the present invention, and shows an example of a conductive texture portion in which cloth-like conductive fibers are integrated into the surface layer portion of an elastic body. [Figure 3] FIG. 3 is an enlarged, partially sectional perspective view showing a main part of the bearing seal of FIG. 2. [Figure 4] 1 is a schematic diagram showing an enlarged cross section of a conductive texture portion formed by integrating cloth-like conductive fibers into the surface layer portion of an elastic body. [Figure 5A] FIG. 2 is an enlarged view of a main section showing the area around one bearing seal in the rolling bearing of FIG. 1 (the area enclosed by the dashed line in FIG. 1), with the outer diameter side conductive texture portion in contact with the outer ring and the inner diameter side conductive texture portion in contact with the inner ring. [Figure 5B] 2 is an enlarged view of a main section showing the area around one bearing seal in the rolling bearing of FIG. 1, with the outer periphery of the elastic body in contact with the outer ring and the inner periphery of the elastic body in contact with the inner ring. FIG. [Figure 6] 4 is the same partial cross-sectional perspective view as FIG. 3, showing an example of a conductive texture portion formed by integrating nonwoven conductive fibers into the surface layer portion of an elastic body. [Figure 7] FIG. 10 is a perspective view showing the inner side in the width direction of the bearing seal of the first modified example. [Figure 8] FIG. 10 is a perspective view showing the inner side in the width direction of a bearing seal of a second modified example. [Figure 9] FIG. 11 is an enlarged vertical cross-sectional view of a main part around a bearing seal of a third modified example. [Figure 10] FIG. 10 is an enlarged vertical cross-sectional view of a main part around a bearing seal of a fourth modified example. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0024] In this specification, the direction parallel to the direction of the central axis of rotation of the rolling bearing is called the "width direction" (see, for example, arrow B in Fig. 1), and the direction perpendicular to the direction of the central axis of rotation is called the "radial direction" (see, for example, arrow R in Fig. 1). The "circumferential direction" (see, for example, arrow C in Fig. 2) is defined relative to the direction of the central axis of rotation.

[0025] In this specification, the width direction approaching the widthwise center of the rolling bearing (for example, symbol BC in Figure 1) is referred to as the "widthwise inner direction" (for example, see arrow BI in Figure 1), the width direction moving away from the widthwise center is referred to as the "widthwise outer direction" (for example, see arrow BO in Figure 1), the radial direction approaching the rotational center axis is referred to as the "radial direction inner direction" (for example, see arrow RI in Figure 1), and the radial direction moving away from the rotational center axis is referred to as the "radial direction outer direction" (for example, see arrow RO in Figure 1).

[0026] [Rolling bearings] The rolling bearing 10 shown in Fig. 1 comprises an outer ring 11, an inner ring 12, rolling elements 13, a cage 14, and a bearing seal 1 according to an embodiment of the present invention. The rolling elements 13 roll between the raceway surfaces of the outer ring 11 and the inner ring 12. The cage 14 guides the rolling elements 13 at a predetermined interval and holds them rotatably. The outer periphery F of the bearing seal 1 engages with an engagement groove 11A in the outer ring 11, thereby attaching the bearing seal 1 to the outer ring 11.

[0027] [Bearing seal] The bearing seal 1 shown in Figure 1-3 includes an annular seal ring 2. The seal ring 2 has an annular core 3 and an annular elastic body 4 made of a rubber material. The rubber material may be nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), acrylic rubber (ACM), silicone rubber (VQM), fluororubber (FKM), ethylene propylene diene rubber (EPDM), or the like. The core 3 is used to improve the strength of the bearing seal 1, so depending on the strength required of the bearing seal 1, the core 3 may be eliminated.

[0028] [Conductive texture part] A conductive texture portion A, which is integrated with conductive fibers 5, is present in a predetermined area of ​​the surface layer portion on one side (inner side BI) in the thickness direction (width direction B) of the elastic body 4. The conductive fibers 5 are carbon fibers or chemical fibers coated with a metal such as copper, nickel, or silver.

[0029] The conductive texture portion A shown in Figure 2-3 is formed by integrating cloth-like conductive fibers into the surface layer portion of the elastic body 4. That is, as shown in the schematic diagram of Figure 4, the conductive fibers 5 integrated into the surface layer portion D on one surface 4A side of the elastic body 4 are cloth-like and consist of a portion 6 protruding from the surface 4A of the elastic body 4 and a portion 7 embedded inside the elastic body 4. Therefore, the portion 6, which is a part of the conductive fibers 5, is exposed from the surface 4A of the elastic body 4.

[0030] This structure, in which the conductive fibers 5 are integrated with surface layer portion D of the elastic body 4, greatly reduces the risk of the conductive fibers 5 peeling off from the elastic body 4. Furthermore, the conductive fibers 5 exposed from surface 4A of the elastic body (portion 6 in FIG. 4) are in sliding contact with the inner ring 12, reducing electrical resistance and stabilizing contact for electrical conduction because portion 6 of the conductive fibers 5 cuts through the oil film, preventing the formation of an oil film unlike on the sliding surfaces of a conductive elastomer and inner ring 12 in the presence of a lubricant.

[0031] The conductive texture portion A shown in Figure 2-3 consists of a middle conductive texture portion A0, an outer diameter side conductive texture portion A1, and an inner diameter side conductive texture portion A2. The middle conductive texture portion A0 is the middle part of the conductive texture portion A in the radial direction R, and is annular and located in the middle of the elastic body 4 in the radial direction R.

[0032] The outer diameter side conductive texture portion A1 is the outer diameter side portion of the conductive texture portion A located on the outer periphery 8 of the elastic body 4, and is not continuous in the circumferential direction C, but is a circumferentially interrupted type I that is circumferentially spaced apart so as to be discontinuous in the circumferential direction C. The inner diameter side conductive texture portion A2 is the inner diameter side portion of the conductive texture portion A located on the inner periphery 9 of the elastic body 4, and is not continuous in the circumferential direction C, but is a circumferentially interrupted type I that is circumferentially spaced apart so as to be discontinuous in the circumferential direction C.

[0033] As a result, the outer diameter side conductive texture portion A1 contacts the outer ring 11 as shown in Fig. 5A, and the outer peripheral portion 8 of the elastic body 4 also contacts the outer ring 11 as shown in Fig. 5B. Furthermore, the inner diameter side conductive texture portion A2 contacts the outer peripheral surface 12A of the inner ring 12 as shown in Fig. 5A, and the inner peripheral portion 9 of the elastic body 4 also contacts the outer peripheral surface 12A of the inner ring 12 as shown in Fig. 5B. Therefore, the outer ring 11 and the inner ring 12 are electrically connected by the conductive texture portion A.

[0034] The conductive fibers 5 integrated into the surface layer D on one surface 4A side of the elastic body 4 in the conductive texture portion A are not limited to a cloth-like shape as shown in Figure 2-4, but may also be in the form of a nonwoven fabric as shown in Figure 6, and the conductive texture portion A may have a planar structure.

[0035] The bearing seal 1 having such a conductive texture portion A can be easily manufactured by, for example, direct pressure molding as follows.

[0036] That is, first, a circular core metal 3 is placed on the lower mold of the molding die, then a circular pre-vulcanized rubber that will become the elastic body 4 is placed on top of that, and then a predetermined shaped sheet of conductive fiber 5 in the form of a cloth or nonwoven fabric is placed on top of that. Next, the upper mold of the molding die is closed and heated, and the pre-vulcanized rubber is vulcanized while being molded under pressure. This causes the rubber to flow into the gaps between the conductive fibers 5 and mold the product. After the rubber has been vulcanized, the molded product is removed from the molding die to obtain a bearing seal 1 having a conductive textured portion A as shown in Figures 2-3 or 6.

[0037] [Variations] The first modified example shown in Figure 7 shows an example in which the outer diameter side conductive texture portion A1 and the inner diameter side conductive texture portion A2 are not circumferentially discontinuous type I. That is, in the bearing seal 1 shown in Figure 7, the outer diameter side conductive texture portion A1 and the inner diameter side conductive texture portion A2 are circumferentially separated type S in which cuts E in the radial direction R are made at predetermined intervals in the circumferential direction C.

[0038] The bearing seal 1 shown in Fig. 7 can be easily manufactured by the direct pressure molding. That is, in the direct pressure molding, a circular sheet body of predetermined shape made of conductive fiber 5 in the form of a cloth or nonwoven fabric with incisions E in the radial direction R at predetermined intervals in the circumferential direction C is prepared.

[0039] The second modified example shown in Figure 8 shows an example in which the intermediate conductive texture portion A0 is of the circumferentially interrupted type I that is spaced apart in the circumferential direction C so as to be discontinuous in the circumferential direction C. In other words, the outer diameter side conductive texture portion A1, the intermediate conductive texture portion A0, and the inner diameter side conductive texture portion A2 are all of the circumferentially interrupted type I.

[0040] When manufacturing the bearing seal 1 by the direct pressure molding, taking into consideration the positioning of the sheet body relative to the lower mold, it is a preferred embodiment to make the intermediate conductive texture portion A0 an integral circular ring as shown in Figure 2, rather than making it circumferentially discontinuous I as shown in Figure 8.

[0041] The third modified example shown in Figure 9 shows an example in which the inner diameter side conductive texture portion A2 contacts the radial surface 12B of the inner ring 12, rather than the outer peripheral surface 12A of the inner ring 12 as shown in Figure 5A.

[0042] 10 shows an example in which the outer diameter side conductive texture portion A1 contacts the core 3 instead of the outer ring 11 as shown in FIG. 5A. The engagement portion 3A of the core 3 engages with the engagement groove 11A of the outer ring 11. Therefore, the core 3 and the conductive texture portion A provide electrical continuity between the outer ring 11 and the inner ring 12.

[0043] In an embodiment of the present invention, for example, as shown in Fig. 5A, outer ring 11 and inner ring 12 are electrically connected by conductive texture portion A. Alternatively, as shown in Fig. 10, outer ring 11 and inner ring 12 are electrically connected by core 3 and conductive texture portion A. Therefore, in a more preferred embodiment, the rubber material forming elastic body 4 is not electrically conductive.

[0044] However, depending on the required specifications of the rolling bearing, conductive rubber may be used as the rubber material forming the elastic body 4. For example, if the required specifications require a large interference and there is concern that the inner diameter side conductive texture portion A2 that slides against the inner ring 12 will wear out in the future, it may be possible to use conductive rubber for the elastic body 4. In this case, after the inner diameter side conductive texture portion A2 wears out, the elastic body 4, which is made of conductive rubber, will come into contact with the inner ring 12. However, since the inner diameter side conductive texture portion A2 is located in close proximity to the elastic body 4 that contacts the inner ring 12, the distance over which electricity flows through the conductive rubber (the distance it wears) is short, and the effects of the present invention can be achieved.

[0045] [Action and effect] According to the bearing seal 1 of the embodiment of the present invention described above, in the conductive texture portion A that has a reinforcing effect on the elastic body 4, the inner diameter side conductive texture portion A2 that contacts the inner ring 12 of the rolling bearing 10 is of the circumferentially discontinuous type I or the circumferentially separated type S. Therefore, the reinforcing effect of the inner diameter side conductive texture portion A2 on the elastic body 4 is suppressed and the tightening force applied to the inner ring 12 with which the inner diameter side conductive texture portion A2 contacts can be reduced, so the rotational torque of the rolling bearing 10 does not increase.

[0046] In the bearing seal 1 according to an embodiment of the present invention, the conductive texture portion A comprises conductive fibers 5 integrated into a surface layer portion D on one surface 4A of an elastic body 4 made of a rubber material, with portions 6 of the conductive fibers 5 exposed from the surface 4A. Therefore, when molding, for example, by direct pressure molding, there is no need for the pre-vulcanized rubber to pass through a predetermined shaped sheet of conductive fibers 5 in the form of a cloth or nonwoven fabric, so there is no limit to the density of the conductive fibers 5 that can be used, and the density can be increased. This stabilizes contact between the conductive texture portion A and the outer ring 11 and inner ring 12, or between the conductive texture portion A and the core 3 and inner ring 12. Furthermore, the conductive fibers 5 are not cut by the pre-vulcanized rubber.

[0047] In the bearing seal 1 according to an embodiment of the present invention, in which the outer diameter side conductive texture portion A1 contacts the outer ring 11 of the rolling bearing 10, the outer diameter side conductive texture portion A1 that contacts the outer ring 11 in the conductive texture portion A that has a reinforcing effect on the elastic body 4 is of the circumferentially discontinuous type I or the circumferentially separated type S. In addition, the conductive texture portion A has conductive fibers 5 integrated into a surface layer D on one surface 4A of the elastic body 4, with some of the conductive fibers 5 exposed from the surface 4A.

[0048] Therefore, even if the outer diameter side conductive texture portion A1 is curved in the width direction B, there is no need to control the flow of pre-vulcanized rubber in the molding die or adjust the strength of the sheet of conductive fibers 5 of a predetermined shape that will become the outer diameter side conductive texture portion A1, and the sheet can be easily fitted to the molding die. Therefore, the molding process is not more difficult, and manufacturing costs do not increase. Furthermore, when the outer diameter side conductive texture portion A1 is molded to be curved in the molding die, shrinkage in the inner diameter direction and expansion in the outer diameter direction of the outer diameter side conductive texture portion A1 are suppressed, which prevents uneven density of the conductive fibers 5 and stabilizes electrical contact with the outer ring 11.

[0049] In the bearing seal 1 according to the embodiment of the present invention, in which the core 3 contacts the outer ring 11 of the rolling bearing 10, the outer diameter side conductive texture portion A1 contacts the core 3, and the engagement portion 3A of the core 3 contacts the outer ring 11. Therefore, contact for electrical conduction between the conductive texture portion A and the core 3, and contact for electrical conduction between the core 3 and the outer ring 11, is stable.

[0050] The above description of the embodiments is given by way of example only and is not intended to be limiting, and various improvements and modifications can be made without departing from the scope of the present invention. [Explanation of symbols]

[0051] 1 Bearing seal 2 seal rings 3 Core 3A Engagement part 4 Elastic Body 4A surface 5. Conductive fibers 6. Parts that protrude from the surface of an elastic body 7 Parts embedded inside the elastic body 8 Outer periphery of elastic body 9 Inner circumference of elastic body 10. Rolling bearings 11 Outer ring 11A Engagement groove 12 Inner Circle 12A Outer surface 12B Radial surface 13 Rolling elements 14 Cage A Conductive texture part A0 Middle conductive textured part A1 Outer diameter conductive texture A2 Inner diameter conductive texture B Width direction BC Width center BI width direction inside BO Width direction outward C circumferential direction D Surface layer E Cut F outer periphery I Circumferential intermittent type R Radial direction RI radially inward RO radially outward S Circumferentially separated type

Claims

1. A bearing seal including an annular seal ring for use in a rolling bearing including an outer ring, an inner ring, and rolling elements, The seal ring has an elastic body made of a rubber material, a surface layer portion on one surface side of the elastic body is integrated with conductive fibers, and a conductive texture portion is formed in which a part of the conductive fibers is exposed from the surface; an outer diameter-side conductive texture portion, which is an outer diameter side portion of the conductive texture portion located on the outer periphery of the elastic body, and an inner diameter-side conductive texture portion, which is an inner diameter side portion of the conductive texture portion located on the inner periphery of the elastic body, are of a circumferentially discontinuous type that is discontinuous in the circumferential direction, or a circumferentially separated type that has radial cuts made at predetermined intervals in the circumferential direction; the outer diameter side conductive texture portion contacts the outer ring, and the inner diameter side conductive texture portion contacts the inner ring; Bearing seal.

2. A bearing seal including an annular seal ring for use in a rolling bearing including an outer ring, an inner ring, and rolling elements, the seal ring includes a core metal having an engaging portion that engages with the outer ring, and an elastic body made of a rubber material and joined to the core metal, a surface layer portion on one surface side of the elastic body is integrated with conductive fibers, and a conductive texture portion is formed in which a part of the conductive fibers is exposed from the surface; the inner diameter-side conductive texture portion, which is the inner diameter side portion of the conductive texture portion located on the inner peripheral portion of the elastic body, is a circumferentially discontinuous type that is discontinuous in the circumferential direction, or a circumferentially separated type that has radial cuts made at predetermined intervals in the circumferential direction, an outer diameter side conductive texture portion, which is an outer diameter side portion of the conductive texture portion located on the outer periphery of the elastic body, contacts the core metal, and the inner diameter side conductive texture portion contacts the inner ring; Bearing seal.

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