WO2015002135A1

WO2015002135A1 - Seal device

Info

Publication number: WO2015002135A1
Application number: PCT/JP2014/067357
Authority: WO
Inventors: 隆司小村
Original assignee: 内山工業株式会社
Priority date: 2013-07-03
Filing date: 2014-06-30
Publication date: 2015-01-08
Also published as: JP2015014296A

Abstract

The present invention provides a novel seal device that can suppress rusting of metal portions that occurs along with electrochemical reactions while suppressing radio noise. A seal device (7) configured so that an inner member (5) and an outer member (2) configured from readily rusting metal material rotate relative to each other, and interposed between the inner member (5) and the outer member (2), wherein the seal device (7) is characterized in being provided with a core metal (8) fitted in one member (2) of the inner member (5) and the outer member (2), a sealing lip member adhering to the core metal (8) and having electroconductive lip parts (9a, 9b, 9c) that are composed of electroconductive rubber and that slide against the other member (5), and a rubber part (10) in proximity to the inner member (5) and/or the outer member (2), at least the rubber part (10) being composed of non-electroconductive rubber.

Description

Sealing device

The present invention relates to a sealing device used for a bearing device of a wheel support part of, for example, an automobile, and more particularly to a sealing device interposed between an outer ring and an inner ring of a bearing device.

2. Description of the Related Art Conventionally, a bearing device for a wheel support portion of an automobile or the like has elastic sliding on a core metal fitted to an outer ring (outer member) and a slinger (inner member) fixed to the core metal and fitted to an inner ring or inner ring. A sealing device including a seal lip member provided with a lip made of a rubber material in contact therewith is used. In such a bearing device, a potential difference occurs between the inner ring and the outer ring, and static electricity is charged in the outer ring, which may generate sparks. When such a spark is repeated, the spark acts as an electrical noise (so-called radio noise) on a radio or electronic device mounted on the car. For this reason, in Patent Document 1 and Patent Document 2, measures are taken such that the inner ring and the outer ring are energized and the generation of the static electricity is suppressed.

Patent Document 1 describes a seal that is incorporated in a bearing device and includes a conductive elastic member. The seal is configured such that the elastic member is fixed to an outer member (outer member) via a cored bar and slidably contacts the inner member (inner member). In this example, the sliding contact between the conductive elastic member and the inner member secures energization between the inner ring and the outer ring and suppresses the generation of static electricity as described above. Further, Patent Document 2 describes a non-conductive seal fixed to a core metal fitted to an outer ring. The non-conductive seal includes a seal portion that is in sliding contact with the slinger. And in this non-conductive seal, the outer ring and the inner ring are energized by attaching an energizing body made of conductive synthetic rubber to the metal core and sliding the energizing body to a flange formed on the hub shaft. As well, the generation of static electricity is similarly suppressed.

JP 2004-100877 A JP 2010-18045 A

By the way, in the case of the seal described in Patent Document 1, when the muddy water containing salt adheres to the sliding contact portion between the elastic member and the inner member or the contact portion between the elastic member and the outer member, the elastic member becomes conductive. Therefore, an electrochemical reaction usually occurs on the surface of the inner member or outer member made of an iron-based metal, and iron is ionized and rust is easily generated. As the rust progresses, it is expected that the sealing performance of the sliding contact portion and the contact portion will decrease. Also, in Patent Document 2, when muddy water containing salt adheres to the current-carrying member, rust is similarly generated on the surface of the flange, and as the rust progresses, the rust reaches the seal portion and the sealability of the seal portion. Is expected to affect

This invention is made | formed in view of the said situation, providing the novel sealing device which can also suppress generation | occurrence | production of the rust of the metal part accompanying an electrochemical reaction, suppressing generation | occurrence | production of radio noise. It is aimed.

A sealing device according to the present invention is a sealing device configured such that an inner member and an outer member made of a metal material that easily rusts rotate relatively, and is interposed between the inner member and the outer member. A metal core fitted to one of the inner member and the outer member; and a conductive lip portion made of a conductive rubber material fixed to the metal core and in sliding contact with the other member. And a rubber part adjacent to at least one of the inner member and the outer member, and the rubber part is made of a non-conductive rubber material.

According to the present invention, even when muddy water containing salt is interposed between the rubber portion and the inner member or the outer member, it is possible to suppress energization between the rubber portion and the inner member or the outer member. Therefore, although the inner member or the outer member is made of a metal material that easily rusts, the occurrence of rust can be suppressed. For example, even if a non-conductive coating is formed on the inner member or the outer member, if the thickness of the coating is not sufficient, energization may occur if the rubber portion is conductive. On the other hand, since the rubber part itself is non-conductive, it is possible to reliably suppress energization between the rubber part and the inner member or the outer member.

In the present invention, the cored bar is fitted to the outer member, and the rubber part is formed integrally with the seal lip member and is provided radially outside the conductive lip part. Anyway.
According to the present invention, the presence of a rubber portion made of a non-conductive rubber material on the radially outer side that is easily exposed to muddy water or the like further suppresses the occurrence of rust on the inner member or the outer member adjacent to the rubber portion. can do.
In this case, the cored bar includes a cylindrical portion that is fitted to the inner peripheral surface of the outer member, and a disk portion that extends radially inward from an end portion of the cylindrical portion, and the rubber portion includes at least the rubber portion. It is good also as what is provided in the outer peripheral surface of a cylindrical part.
According to this, it can suppress that rust generate | occur | produces in the fitting part of a metal core and an outer side member.
Further, in this case, the inner member has a flange portion formed so as to extend radially outward, and the rubber portion extends radially outward from the outer peripheral surface of the outer member. It is good also as what is formed in the bowl shape adjacent to a flange part.
According to this, even if it has a bowl-shaped rubber part, it can suppress that rust generate | occur | produces in a flange part.

In the present invention, the rubber portion may have a lip portion that is provided on a radially outer side of the conductive lip portion and that is in sliding contact with the other member.
According to the present invention, the presence of the lip portion on the outer side in the radial direction of the conductive lip portion prevents infiltration of sludge from the outer side in the radial direction between the conductive lip portion and the other member in sliding contact with the conductive lip portion. Thus, the occurrence of rust on the other member at the sliding contact portion is suppressed.

In the present invention, the conductive lip portion is made of a rubber material containing conductive carbon, and the rubber portion is made of a rubber material containing carbon having lower conductivity than the conductive carbon. It is also good.
According to the present invention, the conductive lip portion and the non-conductive rubber portion can be made separately by using conductive carbon for the conductive lip portion and carbon having low conductivity for the rubber portion, respectively. it can. Therefore, the conductive lip portion and the nonconductive rubber portion can be easily formed.

In the present invention, the conductive lip portion is made of a rubber material containing conductive carbon, and the rubber portion does not contain the conductive carbon, or the amount of carbon contained in the conductive lip portion. It may be composed of a rubber material containing a smaller amount of the carbon.
According to the present invention, the conductive lip portion and the non-conductive rubber portion can be made separately by adjusting the amount of conductive carbon. Therefore, the conductive lip and the nonconductive rubber portion can be easily formed.

According to the present invention, it is possible to provide a novel sealing device capable of suppressing the generation of rust of a metal part accompanying an electrochemical reaction while suppressing the generation of radio noise.

It is a schematic longitudinal cross-sectional view which shows an example of the bearing apparatus with which the sealing device which concerns on this invention is applied. It is an enlarged view of the X section of Drawing 1, and is a figure showing one embodiment of the sealing device concerning the present invention. It is the same figure as FIG. 2 which shows the modification of the embodiment. It is a figure similar to FIG. 2 which shows another modification of the embodiment. It is the same figure as FIG. 2 which shows another modification of the embodiment. It is an enlarged view of the Y section of Drawing 1, and is a figure showing other embodiments of a sealing device concerning the present invention. It is the same figure as FIG. 6 which shows the modification of the embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a bearing device 1 that supports a wheel (not shown) of an automobile so as to be axially rotatable. The bearing device 1 generally includes an outer ring (outer member) 2, a hub ring 3, an inner ring member 4 fitted integrally with the body of the hub ring 3, an outer ring 2, a hub ring 3, and an inner ring member. 4 and two rows of rolling elements (balls) 6 interposed therebetween. In this example, the hub ring 3 and the inner ring member 4 constitute an inner ring 5 as an inner member. The outer ring 2 is fixed to a vehicle body (not shown) of the automobile. A drive shaft (not shown) is coaxially splined to the hub wheel 3. The inner ring 5 (the hub ring 3 and the inner ring member 4) is rotatable around the axis L with respect to the outer ring 2, and the outer ring 2 and the inner ring 5 constitute two members that rotate relatively. An annular space S is formed between the two members. In the annular space S, two rows of rolling elements 6... Can roll on the race rings 2 a of the outer ring 2, the hub ring 3, and the race rings 3 a and 4 a of the inner ring member 4 while being held by the retainer 6 a. It is intervened. The hub wheel 3 includes a cylindrical hub wheel main body 30 and a hub flange (flange portion) 32 formed so as to extend radially outward from the hub wheel main body 30 via an extended base 31. A wheel is attached and fixed to 32 by a bolt 33 and a nut (not shown). Hereinafter, the side facing the wheel along the axis L direction (the side facing the right side in FIG. 1) is referred to as the wheel side, and the side facing the vehicle body (the side facing the left side) is referred to as the vehicle body side.

The annular space S forms a bearing space, and is both ends of the annular space (hereinafter referred to as bearing space) S along the axial center L direction, between the outer ring 2 and the hub ring 3, and the outer ring 2. Bearing seals 7 and 70 as embodiments of the sealing device according to the present invention are mounted between the inner ring member 4 and the inner ring member 4, and both end portions along the axis L direction of the bearing space S are sealed. This prevents intrusion of sludge and the like into the bearing space S and leakage of the lubricant (grease etc.) filled in the bearing space S to the outside. The outer ring 2 and the inner ring 5 (the hub ring 3 and the inner ring member 4) are made of a metal material that easily rusts, and are made of, for example, carbon steel or high carbon chrome steel.

Of the bearing seals 7 and 70, the wheel-side bearing seal 7 will be described with reference to FIGS. FIG. 2 shows an embodiment of the sealing device according to the present invention. The bearing seal 7 in the example is fixed to the core metal 8 fitted to the inner peripheral surface 2b of the outer ring 2 and to the outer peripheral surface of the hub ring 3 (surface facing the bearing space S). And a sealing lip member 9 having

conductive lip portions

9a, 9b, 9c made of conductive rubber material, which are in sliding contact. Further, the seal lip member 9 is integrally formed with a rubber portion 10 made of a non-conductive rubber material on the outer side in the radial direction from the

conductive lip portions

9a, 9b, 9c. The rubber portion 10 is formed so as to be close to the wheel side end surface 2 c of the outer ring 2. The core 8 extends radially inward (centripetal direction) through a cylindrical portion 81 fitted to the inner peripheral surface 2b of the outer ring 2 and a tapered portion 81b facing the wheel side from the wheel side end portion 81a of the cylindrical portion 81. And a disk portion 82. The seal lip member 9 covers the wheel side surface 82a of the disk part 82 from the wheel side end part 81a of the metal core 8 through the taper part 81b, and wraps around from the inner peripheral edge part 82b of the disk part 82 to the vehicle body side. 8 has a seal lip base 90 secured to the base 8. The

conductive lip portions

9 a, 9 b, 9 c extend from the seal lip base portion 90 toward the hub wheel 3, and each tip portion thereof is configured to elastically contact the surface of the hub wheel 3. Further, the rubber part 10 is formed so as to constitute a part of the seal lip base part 90. In the present embodiment, the rubber part 10 has an annular protrusion 10a on the outer diameter side peripheral part of the rubber part 10, and The radial side portion includes the annular protrusion 10a and is configured to be interposed between the outer peripheral surface of the tapered portion 81b and the inner peripheral surface 2b of the outer ring 2 in a compressed state. A two-dot chain line portion in FIG. 2 indicates the original shape of the annular protrusion 10a. The conductive lip portion 9 a is a radial lip that elastically contacts the outer peripheral surface 30 a of the hub ring main body 30 of the hub ring 3. The conductive lip portion 9 b is an axial lip that elastically contacts the concave curved surface 31 a of the extended base portion 31 of the hub flange 32, and the conductive lip portion 9 c elastically contacts the vehicle body side surface 32 a of the hub flange 32. It is an axial lip.
In the following, the outer peripheral surface 30a of the hub wheel body 30, the concave curved surface 31a of the extended base 31 and the vehicle body side surface 32a of the hub flange 32 may be collectively referred to as

surfaces

30a, 31a, 32a of the hub wheel 3. is there.

The seal lip member 9 is molded using a rubber material containing conductive carbon and a rubber material not containing conductive carbon, for example, by a two-color molding method. In FIG. 2, a spotted portion of the seal lip member 9 indicates a portion containing conductive carbon, and a portion without a spot indicates a portion not containing conductive carbon. . The portion not containing conductive carbon is located radially outside the portion containing conductive carbon, and the rubber portion 10 is provided radially outside the

conductive lip portions

9a, 9b, 9c. It has been. The portions of the seal lip base 90 where the

conductive lip portions

9a, 9b, 9c are extended contain conductive carbon as shown in the figure.

Thus, since the seal lip member 9 is composed of the rubber material containing conductive carbon and the rubber material not containing the conductive carbon, the cost of the seal lip member 9 can be reduced. In this case, if a colorant having a color different from that of the portion containing conductive carbon is added to the portion not containing conductive carbon, the conductive portion and non-conductive portion can be easily distinguished and handled. Convenient to.
Instead of the portion not containing conductive carbon, the portion containing less conductive carbon than the conductive carbon, or the amount of conductive less than the portion containing the conductive carbon. It is also possible to use a portion containing a conductive carbon. That is, the rubber part 10 is configured to be non-conductive because it contains only low-conductivity carbon or has a low content of conductive carbon. Here, as the conductive carbon, various carbons can be used as long as the carbon can impart conductivity to the rubber material with a small addition amount. The carbon having low conductivity may be carbon that does not impart conductivity to the rubber material with a small addition amount. For example, carbon having a lower oil absorption than conductive carbon is employed.

In the bearing device 1 having the bearing seal 7 configured as described above, when the inner ring 5 rotates around the axis L, the

conductive lip portions

9a, 9b, 9c become the

surfaces

30a, 31a, 32a of the hub ring 3. Relative sliding contact with each other. Therefore, the outside and the bearing space S are blocked by the sliding contact portion, and entry of muddy water or dust into the bearing space S from the outside, leakage of the lubricant from the bearing space S to the outside, and the like are prevented. The sliding contact is made between the

conductive lip portions

9a, 9b, 9c, which are conductors of each other, and the hub ring 3 made of a metal material, so that the hub ring 3 (inner ring 5) and the outer ring 2 are connected to each other. Electrical continuity is achieved through the seal lip member 9 and the cored bar 8. Therefore, a potential difference is unlikely to occur between the hub wheel 3 and the outer ring 2, and the occurrence of sparks due to static electricity being charged to the outer ring 2 is suppressed. As a result, the generation of the radio noise in the radio and electronic equipment mounted on the vehicle can be suppressed.

Further, muddy water or the like is likely to accumulate in the proximity portion c1 between the non-conductive rubber portion 10 and the wheel side end surface 2c of the outer ring 2. Depending on the environment, this muddy water may contain salt, but since the rubber part 10 is non-conductive, an electrochemical reaction occurs between the rubber part 10 and the wheel side end surface 2c of the outer ring 2 in the proximity part c1. There is no concern that this will occur. Therefore, although the outer ring 2 and the hub flange 32 (hub ring 3) are made of a metal material that easily rusts, the constituent metals are less likely to be ionized, and rust is generated on the wheel side end surface 2c of the outer ring 2 in the proximity portion c1. It can be suppressed. As a result, it is difficult for rust to progress to the fitting portion between the outer ring 2 and the cored bar 8 to weaken the fitting strength, or for the sludge to enter the bearing space S from the fitting portion. In the case of this embodiment, a part of the rubber portion 10 including the annular protrusion 10a is interposed in a compressed state between the inner peripheral surface 2b of the outer ring 2 and the outer peripheral surface of the tapered portion 81b. Combined with the function of preventing the intrusion of muddy water into the fitting portion with the cored bar 8, the maintenance of the fitting strength and the like is made more effective.

FIG. 3 shows a modification of the embodiment. In the bearing seal 7A of this embodiment, the cored bar 8 includes a cylindrical portion 81 that is fitted to the inner peripheral surface 2b of the outer ring 2 in the same manner as described above. The cylindrical portion 81 includes a disc portion (hereinafter, referred to as an outward disc portion in this embodiment) 83 that extends radially outward (centrifugal direction) from the wheel side end portion 81 a, and a cylindrical portion 81. A disc portion (hereinafter, referred to as an inward disc portion in this embodiment) 82 extending radially inward from the vehicle body side end portion 81c is formed. In other words, the cored bar 8 of this embodiment includes an outwardly facing disk part 83 in addition to the cylindrical part 81 and the inwardly facing disk part 82. The seal lip member 9 has a seal lip base portion 90 as described above, and

conductive lip portions

9a, 9b, and 9c extend from the seal lip base portion 90 in the same manner as described above, and the

conductive lip portions

9a and 9b. , 9c are configured to elastically contact the

surfaces

30a, 31a, 32a of the hub wheel 3. In addition, the rubber part 10 made of a non-conductive rubber material as a part of the seal lip base part 90 covers the wheel side surface 83a and the outer peripheral edge part 83b of the outward disk part 83 of the cored bar 8, and the outer periphery of the outer ring 2 It has a hook-like portion 10b extending in a hook shape radially outward from the surface 2d. Further, a part of the bowl-shaped portion 10b is a wrap portion 10ba that wraps around from the outer peripheral edge portion 83b of the outward circular plate portion 83 toward the vehicle body. The wrap portion 10ba is formed outwardly from the wheel side end surface 2c of the outer ring 2. It is interposed between the vehicle body side surfaces 83c of the disc part 83 in a compressed state. Since other configurations are the same as those in the example shown in FIG. 2, the same reference numerals are given to common portions, and descriptions thereof are omitted.

Also in the bearing seal 7A of this embodiment, muddy water or the like is likely to be accumulated in the proximity portion c3 between the non-conductive rubber portion 10 (turning portion 10ba) and the outer peripheral surface 2d of the outer ring 2 as described above. In addition, muddy water or the like tends to accumulate in the proximity c4 between the non-conductive rubber part 10 (the bowl-like part 10b) and the vehicle body side surface 32a of the hub flange 32 due to the influence of surface tension while the vehicle is stopped. Since the rubber part 10 is non-conductive, it is electrically connected between the rubber part 10 and the outer peripheral surface 2d of the outer ring 2 and between the rubber part 10 and the vehicle body side surface 32a of the hub flange 32 in the proximity parts c3 and c4. There is no concern about chemical reactions. Therefore, similarly to the above, the occurrence of rust on the outer peripheral surface 2d of the outer ring 2 and the vehicle body side surface 32a of the hub flange 32 in the proximity portions c3 and c4 is suppressed. In the case of this embodiment, the wrap portion 10ba is interposed in a compressed state between the wheel side end surface 2c of the outer ring 2 and the vehicle body side surface 83c of the outward disk portion 83, so that the outer ring 2 and the core metal 8 are fitted by this. Combined with the function of preventing the intrusion of muddy water into the joint, the fitting strength can be maintained more effectively. Further, it is possible to suppress the rust from proceeding to the sliding contact portions with the

conductive lip portions

9a, 9b, 9c on the

surfaces

30a, 31a, 32a of the hub wheel 3. As a result, the tips of the

conductive lip portions

9a, 9b, and 9c are less likely to be worn over time by the

surfaces

30a, 31a, and 32a of the hub wheel 3 roughened by rust and the sealing performance is lowered.

FIG. 4 shows another modification of the embodiment. In the bearing seal 7B of this embodiment, the cored bar 8 is fitted to the outer peripheral surface 2d of the outer ring 2 and the disc part 82 extends radially inward from the wheel side end 81a of the cylindrical part 81. And. The cylindrical portion 81 is fitted to the outer peripheral surface 2d of the outer ring 2 so that the vehicle body side surface 82c of the disc portion 82 contacts the wheel side end surface 2c of the outer ring 2. The seal lip member 9 has a seal lip base portion 90 as described above, and the

conductive lip portions

9a, 9b, and 9c extend from the seal lip base portion 90 as described above. The respective leading end portions of the

conductive lip portions

9a, 9b, 9c are configured to elastically contact the

surfaces

30a, 31a, 32a of the hub wheel 3. In addition, the rubber portion 10 made of a non-conductive rubber material as a part of the seal lip base portion 90 covers the outer peripheral surface 81d of the cylindrical portion 81 and the vehicle body side end portion 81c of the cored bar 8, and the cylindrical portion 81 and the outer ring It has the exterior part 10c which faces between 2 outer peripheral surfaces 2d. Further, the rubber portion 10 extends obliquely toward the hub flange 32 and radially outward from a portion corresponding to the wheel side end portion 81a of the cylindrical portion 81, and is refracted in an L shape toward the vehicle body from the middle. It has a bowl-shaped part 10d. The rubber portion 10 of this embodiment is configured so as to be closer to the vehicle body side surface 32a of the hub flange 32 via the refracting portion 10da of the flange-shaped portion 10d, as compared with the above-described embodiments. Other configurations are the same as those in the example shown in FIGS. 2 and 3, and thus, common portions are denoted by the same reference numerals and description thereof is omitted.

Also in the bearing seal 7B of this embodiment, muddy water or the like is likely to accumulate in the proximity c5 between the non-conductive rubber part 10 (exterior part 10c) and the outer peripheral surface 2d of the outer ring 2 as described above. In addition, muddy water or the like tends to accumulate in the proximity c6 between the non-conductive rubber portion 10 (the refracting portion 10da of the bowl-shaped portion 10d) and the vehicle body side surface 32a of the hub flange 32 due to the influence of surface tension while the vehicle is stopped. . Since the rubber part 10 is non-conductive, it is electrically connected between the rubber part 10 and the outer peripheral surface 2d of the outer ring 2 and between the rubber part 10 and the vehicle body side surface 32a of the hub flange 32 in the proximity parts c5 and c6. There is no concern about chemical reactions. Therefore, similarly to the above, the occurrence of rust on the outer peripheral surface 2d of the outer ring 2 and the vehicle body side surface 32a of the hub flange 32 in the proximity portions c5 and c6 is suppressed. In the case of this embodiment, the exterior portion 10c covers the outer peripheral surface 81d and the vehicle body side end portion 81c of the cylindrical portion 81, and faces between the cylindrical portion 81 and the outer peripheral surface 2d of the outer ring 2. 8 together with the function of preventing the intrusion of muddy water into the fitting portion, the maintenance of the fitting strength and the like is made more effective. Further, it is possible to suppress the rust from proceeding to the sliding contact portions with the

conductive lip portions

9a, 9b, 9c on the

surfaces

30a, 31a, 32a of the hub wheel 3. As a result, the tips of the

conductive lip portions

9a, 9b, and 9c are less likely to be worn over time by the

surfaces

30a, 31a, and 32a of the hub wheel 3 roughened by rust and the sealing performance is lowered. In addition, since the refracting portion 10da of the bowl-shaped portion 10d is closer to the vehicle body side surface 32a of the hub flange 32, the labyrinth action causes infiltration of muddy water from the outside to the

conductive lip portions

9a, 9b, 9c side. Suppression is made more effective.

FIG. 5 shows another modification of the embodiment. In the bearing seal 7C of this embodiment, the cored bar 8 has a cylindrical portion 81 fitted to the inner peripheral surface 2b of the outer ring 2 and a wheel side end portion 81a of the cylindrical portion 81, as in the example shown in FIG. And a disc portion 82 extending radially inward. The seal lip member 9 covers the wheel side surface 82a of the disc portion 82 from a portion corresponding to the wheel side end portion 81a of the cylindrical portion 81, and wraps around from the inner peripheral edge portion 82b of the disc portion 82 toward the vehicle body side. It has a series of seal lip bases 90 fixed to the cored bar 8 so as to face the S side. The seal lip base 90 is formed with three

conductive lip portions

9 a, 9 b, 9 d facing the hub wheel 3. However, the seal lip member 9 including the seal lip base 90 and the

conductive lip portions

9a, 9b, 9d is entirely composed of only a conductive rubber material, which is different from the embodiment shown in FIG. Further details of the

conductive lip portions

9a, 9b, 9d will be described later.

Furthermore, in this embodiment, the hub ring body 30 of the hub ring 3 is integrally fitted with a slinger member 11 made of a metal material such as stainless steel as a part of the inner member. This is different from the example shown in FIG. The slinger member 11 extends radially outward from the cylindrical portion 110 fitted to the outer peripheral surface 30a of the hub wheel main body 30 and the wheel side end portion 110a of the cylindrical portion 110 via the curved extending base portion 111. The disc portion 112 and the curved shape portion 113 continuing from the disc portion 112 are configured. The disc part 112 is extended from the wheel side end part 110a through the extension base part 111 so as to follow the surface 31a of the extension base part 31 of the hub flange 32 and the vehicle body side face 32a of the hub flange 32 in a non-contact state. Yes. Further, the curved shape portion 113 is formed so as to be separated from the vehicle body side surface 32 a of the hub flange 32 continuously from the radially outer end portion 112 a of the disc portion 112. The rubber portion 10 made of a non-conductive rubber material is separated from the seal lip member 9, and is formed on both surfaces of the curved shape portion 113 and the curved shape portion 113 from both sides of the outer diameter side portion of the disc portion 112 in the slinger member 11. Are integrally fixed so as to surround the outer peripheral edge 113a. The rubber portion 10 includes an annular protrusion 10e that contacts the vehicle body side surface 32a of the hub flange 32 and a lip portion 10f that extends so as to approach the seal lip base 90 fixed to the core metal 8. The rubber portion 10 is formed so as to surround the outer peripheral surface 2d in a non-contact state from the inner peripheral surface 2b of the outer ring 2 through the wheel side end surface 2c.

The three

conductive lip portions

9a, 9b, 9d of the seal lip member 9 are all conductive lip portions. However, the outermost conductive lip portion 9d is located on the radially inner side with respect to the lip portion 10f of the rubber portion 10, and is not in contact with any member including the lip portion 10f and the slinger member 11. It is in a state. The lip portion 10f of the rubber portion 10 and the conductive lip portion 9d are formed so as to cross each other, thereby forming a labyrinth. The conductive lip portion 9 a is a radial lip whose tip is elastically contacted with the outer peripheral surface 110 b of the cylindrical portion 110 of the slinger member 11, and the conductive lip portion 9 b is a surface 111 a of the curved extended base portion 111 of the slinger member 11. It is said to be an axial lip that touches the surface. Other configurations are the same as those in the example shown in FIGS. 2 to 4, and thus, common portions are denoted by the same reference numerals and description thereof is omitted.

Also in the bearing seal 7C of this embodiment, the non-conductive rubber portion 10 (exterior portion 10c) and the inner peripheral surface 2b of the outer ring 2, the wheel side end surface 2c, and the outer peripheral surface 2d while the vehicle is stopped are the same as described above. Muddy water or the like tends to accumulate in the proximity portion c7 between the non-conductive rubber portion 10 and the proximity portion c8 between the non-conductive rubber portion 10 and the vehicle body side surface 32a of the hub flange 32. Depending on the environment, this muddy water may contain salt. However, since the rubber part 10 is non-conductive, the rubber part 10 and the inner peripheral surface 2b of the outer ring 2 and the wheel side end face 2c in the proximity parts c7 and c8. There is no concern that an electrochemical reaction occurs between the outer peripheral surface 2d and between the rubber portion 10 and the vehicle body side surface 32a of the hub flange 32. Therefore, similarly to the above, the occurrence of rust on the inner peripheral surface 2b of the outer ring 2, the wheel side end surface 2c and the outer peripheral surface 2d, and the vehicle body side surface 32a of the hub flange 32 in the proximity portions c7 and c8 is suppressed. In the case of this embodiment, the slingers of the

conductive lip portions

9a and 9b are formed by a labyrinth shape formed by a staggered formation between the lip portion 10f of the non-conductive rubber portion 10 and the conductive lip portion 9d of the seal lip member 9. Intrusion of muddy water or the like into the elastic contact portion with respect to the member 11 is suppressed. Further, the annular protrusion 10e in the non-conductive rubber portion 10 abuts on the vehicle body side surface 32a of the hub flange 32 in order to prevent the intrusion of muddy water between the slinger member 11 and the hub flange 32 from the outside. Yes. In this form, since generation | occurrence | production of the rust in the vehicle body side surface 32a of the hub flange 32 is suppressed, it can avoid that the sealing effect by the annular protrusion 10e falls.

FIG. 6 is an enlarged view of a Y portion in FIG. 1 and shows another embodiment of the sealing device according to the present invention. The bearing seal 70 as a sealing device shown in FIG. 6 is a pack seal type bearing seal provided at the vehicle body side end portion of the bearing space S in the bearing device 1 shown in FIG. The bearing seal 70 of the present embodiment is roughly composed of a core metal 8 fitted to the inner peripheral surface 2 b of the outer ring 2, a seal lip member 9 fixed to the core metal 8, and an inner ring member (inner member) 4. The slinger 12 is fitted to the outer peripheral surface 4b. The cored bar 8 includes a cylindrical part 81 fitted to the inner peripheral surface 2 b of the outer ring 2 and a disk part 82 extending radially inward from the wheel side end part 81 a of the cylindrical part 81. The slinger 12 includes a cylindrical portion 121 fitted to the outer peripheral surface 4b of the inner ring member 4, and a disc portion 122 extending radially outward from the vehicle body side end portion 121a of the cylindrical portion 121. An annular magnetic encoder 13 made of a rubber magnet is fixed to the vehicle body side surface 122a of the disc portion 122 of the slinger 12. The rotation of the wheel is detected by the magnetic encoder 13 and the magnetic sensor 14 installed on the vehicle body (not shown). A device 15 is configured. The magnetic encoder 13 is configured by integrally fixing a rubber material containing magnetic powder to the disk portion 122 of the slinger 12 by vulcanization and magnetizing a number of N poles and S poles in the circumferential direction. Is. The magnetic sensor 14 is installed to face the magnetized surface of the magnetic encoder 13.

The seal lip member 9 wraps around the outer diameter side through the vehicle body side end portion 81 c of the metal core 8, and the inner peripheral surface 81 e of the cylindrical portion 81, the vehicle body side surface 82 c of the disc portion 82, and the inner peripheral edge portion of the disc portion 82. A series of seal lip bases 90 fixed to the cored bar 8 is provided so as to cover 82b and face the bearing space S side. Three

conductive lip portions

9 a, 9 b, 9 c extend from the seal lip base portion 90 toward the slinger 12. As will be described later, the three

conductive lip portions

9a, 9b, and 9c are conductive lip portions made of a conductive rubber material. The conductive lip portion 9 a is a radial lip that elastically contacts the outer peripheral surface 121 b of the cylindrical portion 121 of the slinger 12, and the

conductive lip portions

9 b and 9 c are axial lips that elastically contact the wheel side surface 122 b of the disc portion 122. The seal lip member 9 is molded using a rubber material containing conductive carbon and a rubber material not containing conductive carbon, as described above, and is molded by, for example, a two-color molding method. In FIG. 6, a spotted portion of the seal lip member 9 indicates a portion containing conductive carbon, and a portion without a spot indicates a portion not containing conductive carbon. . And the part in which conductive carbon is not contained is located in the radial direction outer side from the part in which conductive carbon is contained. The rubber part 10 constitutes a part of the seal lip base part 90, is composed of a part not containing conductive carbon, and is provided on the radially outer side from the

conductive lip parts

9a, 9b, 9c. The portions of the seal lip base 90 where the

conductive lip portions

9a, 9b, 9c are extended contain conductive carbon as shown in the figure. The non-conductive rubber portion 10 has an annular protrusion 10g at a portion of the core bar 8 that wraps around the outer diameter side through the vehicle body side end portion 81c. The annular protrusion 10g is interposed in a compressed state between the inner peripheral surface 2b of the outer ring 2 and the cylindrical portion 81 of the core metal 8, and a two-dot chain line in FIG. 6 indicates the original shape of the annular protrusion 10g. . Since other configurations are the same as described above, common portions are denoted by the same reference numerals, and description thereof is omitted.

Also in the bearing seal 70 of this embodiment, muddy water or the like tends to accumulate in the proximity portion c9 between the non-conductive rubber portion 10 and the inner peripheral surface 2b of the outer ring 2 while the vehicle is stopped, as described above. Since the rubber part 10 is non-conductive, there is no concern that an electrochemical reaction occurs between the rubber part 10 and the inner peripheral surface 2b of the outer ring 2 in the proximity part c9. Accordingly, similarly to the above, the occurrence of rust on the inner peripheral surface 2b of the outer ring 2 and the vehicle body side end surface 2e in the proximity portion c9 is suppressed. In the case of this embodiment, the annular protrusion 10g in the non-conductive rubber part 10 is interposed between the outer ring 2 and the cylindrical part 81 of the core metal 8 in a compressed state. In combination with the function of preventing the intrusion of muddy water into the fitting portion, the fitting strength can be maintained more effectively.

FIG. 7 shows a modification of the example shown in FIG. The bearing seal 70A in this example is a pack seal type bearing seal as in the example shown in FIG. However, the bearing seal 70A is different from the example shown in FIG. 6 in that no rotation detection device is attached and the non-conductive rubber portion 10 has a lip portion 10h that elastically contacts the slinger 12. Further, the point that the seal lip member 9 has three

conductive lip portions

9 a, 9 b, 9 c is shared with the example shown in FIG. 6, but the conductive lip portion 9 b is a cylindrical portion 121 in the slinger 12. 6 is different from the example shown in FIG. 6 in that it is a radial lip that elastically contacts with the outer peripheral surface. The core metal 8 and the slinger 12 are the same as the example shown in FIG. 6, and the seal lip member is also integrally fixed to the core metal 8 in the same manner. The non-conductive rubber portion 10 has a lip portion 10 h that extends from the portion of the seal lip base portion 90 that does not include the conductive rubber material toward the disc portion 122 of the slinger 12. The lip portion 10h is located radially outside the conductive lip portion 9c, and is configured to elastically contact the wheel side surface 122b of the disc portion 122 in the slinger 12. Since the other configuration is the same as the example shown in FIG. 6, the same reference numerals are given to the common parts, and the description thereof is omitted.

Also in the bearing seal 70A of this embodiment, as described above, when the vehicle is stopped, the proximity portion c11 between the non-conductive rubber portion 10 and the inner peripheral surface 2b of the outer ring 2 or the rubber portion 10 (lip portion). 10h) and the proximate portion c12 of the slinger 12 with the wheel side surface 122b of the disc portion 122, muddy water or the like tends to accumulate. Depending on the environment, this muddy water may contain salt, but since the rubber part 10 is non-conductive, in the proximity parts c11 and c12, between the rubber part 10 and the inner peripheral surface 2b of the outer ring 2, or There is no concern that an electrochemical reaction occurs between the rubber part 10 and the wheel side surface 122b of the disk part 122. Therefore, similarly to the above, the occurrence of rust on the inner peripheral surface 2b of the outer ring 2 and the vehicle body side end surface 2e in the proximity portion c11 is suppressed. In the case of this embodiment, since the occurrence of rust in the proximity portion c12 is suppressed, the outer peripheral surface 121b of the cylindrical portion 121 in the slinger 12 and the

conductive lip portions

9a, 9b, 9c on the wheel side surface 122b in the disc portion 122 It is also possible to prevent rust from proceeding to the sliding contact portion. As a result, the tips of the

conductive lip portions

9a, 9b, and 9c are less likely to be worn over time by the outer peripheral surface 121b roughened by rust and the disc portion 122 and the sealing performance is lowered. Further, on the radially outer side of the conductive lip portion 9c, the non-conductive lip portion 10h is in elastic contact with the wheel side surface 122b of the disc portion 122 in the slinger 12, so that the

conductive lip portions

9a, 9b and 9c are in contact with each other. Infiltration of muddy water into the sliding contact portion is suppressed, and the progress of the rust is more effectively prevented.

In addition, although the sealing apparatus of the said embodiment was demonstrated as what is used in order to seal the bearing space S in the bearing apparatus 1, the inner member and outer member which consist of another metal material which is easy to rust rotate relatively. It may be applied to an apparatus configured to do so. Moreover, although the example in which the outer member is fixed and the inner member rotates has been described, the rotational relationship between them may be reversed. Further, the shapes of the core metal 8, the seal lip member 9, the rubber portion 10 and the like (including the number of lip portions of the seal lip member 9 and the like) are not limited to those shown in the drawings, and unless departing from the gist of the present invention, Other shapes may also be used.
Moreover, the rubber material used for the rubber part is not limited to the rubber material described in the above embodiment, and may be any non-conductive material.
In addition, as in the example shown in FIG. 7, the lip portion 10 h constituting the non-conductive rubber portion 10 can be applied to other embodiments.

2 Outer ring (outer member)
3 Hub wheel (inner member)
32 Hub flange (flange)
5 Inner ring (inner member)
7, 7A, 7B, 7C Bearing seal (sealing device)
70,70A Bearing seal (sealing device)
8 Metal core 81 Cylindrical portion 81a End portion 82 Disc portion 9

Seal lip member

9a, 9b, 9c Conductive lip portion 10 Rubber portion 10g Lip portion

Claims

An inner member and an outer member made of a metal material that easily rusts are configured to rotate relatively, and is a sealing device interposed between the inner member and the outer member,
A metal core fitted to one of the inner member and the outer member;
A seal lip member having a conductive lip portion made of a conductive rubber material, which is fixed to the core metal and is in sliding contact with the other member;
A rubber portion adjacent to at least one of the inner member and the outer member;
The said rubber | gum part consists of nonelectroconductive rubber materials, The sealing device characterized by the above-mentioned.
The sealing device according to claim 1,
The core metal is fitted to the outer member,
The said rubber | gum part is integrally formed with the said seal lip member, and is provided in the radial direction outer side rather than the said electroconductive lip part, The sealing device characterized by the above-mentioned.
The sealing device according to claim 2.
The core bar includes a cylindrical portion fitted to the inner peripheral surface of the outer member, and a disk portion extending radially inward from an end portion of the cylindrical portion,
The sealing device according to claim 1, wherein the rubber portion is provided at least on an outer peripheral surface of the cylindrical portion.
The sealing device according to claim 2 or claim 3,
The inner member has a flange portion formed to extend radially outward,
The said rubber | gum part is formed in the hook shape which adjoins the said flange part while extending to a radial direction outer side rather than the outer peripheral surface of the said outer member.
The sealing device according to any one of claims 1 to 4,
The said rubber | gum part has a lip | rip part which is provided in the radial direction outer side of the said electroconductive lip | rip part, and slidably contacts with said other member.
The sealing device according to any one of claims 1 to 5,
The conductive lip portion is composed of a rubber material containing conductive carbon,
The said rubber | gum part is comprised from the rubber material containing carbon whose electroconductivity is lower than the said electroconductive carbon, The sealing device characterized by the above-mentioned.
The sealing device according to any one of claims 1 to 5,
The conductive lip portion is composed of a rubber material containing conductive carbon,
The rubber part does not contain the conductive carbon, or is made of a rubber material containing the carbon in an amount smaller than the amount of carbon contained in the conductive lip part. .