JP2015158253A - sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device which can further enhance sealing performance.SOLUTION: A sealing device 10 for sealing a space S between an inside member 5 and an outside member 2 which relatively and coaxially rotate includes slingers 11 (12) which are fixed to either of the inside member 5 and the outside member 2, and a seal member 13 which is fixed to the other of the inside member 5 and the outside member 2, the slingers 11 (12) comprise a first flange part 11b located at a side opposite to the space S rather than the seal member 13 in an axis L-direction, and a second flange part 12b located at the space S side rather than the seal member 13 in the axis L-direction, the seal member 13 has first seal lips 16, 17 which approximate or slide-contact with the first flange part 11b, and second seal lips 18, 19 which approximate or slide-contact with the second flange part 12b, and all of the first seal lips 16, 17 and the second seal lips 18, 19 include seal lips which are oriented so as to oppose an intrusion direction a of foreign matters which intrude into the space S from the outside.

Description

  The present invention relates to a sealing device, for example, a sealing device used for a bearing device of a wheel support portion in an automobile or the like.

  A bearing device for a wheel support portion in an automobile or the like as described above includes a fixed-side member (for example, an outer ring as an outer member) and a rotation-side member supported on the fixed-side member via a rolling element so as to be coaxially rotatable ( For example, it is comprised by the inner ring | wheel as an inner member. A sealing device is attached to the axial end of the annular bearing space between the fixed side member and the rotating side member (see, for example, Patent Documents 1 to 3). Such automobile bearing devices are always exposed to an environment that is easily attacked by muddy water, dust, and the like. When muddy water, dust, or the like enters the bearing space, the race ring and the rolling element are worn, the smoothness of rotation of the rotating side member via the rolling element is impaired, and the rotational performance of the automobile is deteriorated. Therefore, a high sealing performance is required for a sealing device in this type of bearing device.

JP 2009-197883 A JP 2004-1000082 A JP 2009-30756 A

  A sealing device (seal) used in a wheel bearing device disclosed in Patent Document 1 is a seal member (seal plate) having a core metal fitted in an outer ring and a plurality of seal lips integrally joined to the core metal. ) And a slinger having a substantially L-shaped cross section that is externally fitted to the inner ring and is in sliding contact with a plurality of seal lips. The sealing device disclosed in Patent Document 1 is configured as a pack seal type, and a labyrinth seal is formed between the seal plate and the slinger, and this labyrinth seal prevents intrusion of muddy water and the like from the outside into the sealing device. It is made to do. Even if muddy water enters the sealing device from the labyrinth seal, the muddy water is prevented from entering the bearing space by the sliding contact of the seal lip with the slinger. However, the sliding contact portion of the seal lip with the slinger wears with time, and the sealability may deteriorate due to this wear. In order to compensate for this, it is effective to increase the number of seal lips, but the size of the slinger is limited, and there is a situation that it is difficult to secure the sliding contact portion of the increased amount of the seal lip on the slinger.

  Patent Document 2 discloses a sealing device (seal) in which an L-shaped slinger and an inverted L-shaped slinger are combined. Patent Document 3 discloses a sealing device (seal) in which a slinger and a part of the support member corresponding to the slinger are combined. Both sealing devices disclosed in both patent documents use two slinger for the purpose of disposing a magnetic encoder on one slinger. Both patent documents also disclose an example in which a part of the seal lip is slidably brought into contact with a slinger located on the bearing space side. However, this seal lip is formed so as to follow the intrusion direction of muddy water or the like to enter the bearing space from the outside (toward the forward direction). Therefore, muddy water or the like that has entered the sealing device from the outside. On the other hand, the ability to prevent entry into the bearing space cannot be expected.

  This invention is made | formed in view of the said situation, and it aims at providing the sealing device which can improve sealing performance more.

  A sealing device according to the present invention is a sealing device that seals a space between an inner member and an outer member that rotate relatively coaxially, the slinger being fixed to one of the inner member and the outer member, the inner member, A sealing member fixed to the other of the outer members, wherein the slinger is a first flange portion positioned on the opposite side of the space from the sealing member in the axial direction, and more than the sealing member in the axial direction. A second flange portion positioned on the space side; and the seal member includes a first seal lip that is close to or slidably contacted with the first flange portion, and a second seal lip that is close to or slidably contacted with the second flange portion. Each of the first seal lip and the second seal lip includes a seal lip that is directed so as to oppose the intrusion direction of the foreign matter into the space from the outside. And wherein the door.

  According to the present invention, since the first seal lip and the second seal lip are close to or slidably contact with each of the first flange portion and the second flange portion of the slinger, foreign matter or the like entering the space to be sealed from the outside can be obtained. Effective intrusion prevention. In addition, since the second seal lip includes a seal lip portion whose front end portion is directed so as to face the entry direction of foreign matter from the outside into the space, the first seal lip, the first flange portion, Even if foreign matter or the like passes through the proximity portion or sliding contact portion, the second seal lip prevents further entry of the foreign matter and prevents foreign matter or the like from entering the space more effectively.

In the present invention, the seal member may include a plurality of the first seal lips and the second seal lips.
According to the present invention, by increasing the number of seal lips, the function of preventing entry of the foreign matter or the like into the space is further enhanced.

In the present invention, the slinger includes a first slinger including a first cylindrical portion extending from a radial end portion of the first flange portion and the first flange portion toward the space side, the second flange portion, and the second flange portion. A second slinger including a second cylindrical portion extending from the radial end portion of the flange portion to the opposite side of the space, the first slinger is made of a non-rusting metal material, and the second slinger is easily rusted. It may be made of a metal material.
According to the present invention, when the foreign matter or the like contains muddy water, the first slinger is located at a location that is easily exposed to the muddy water, and the second slinger is located at a location that is difficult to be exposed to the muddy water. Use of rust metal material can be reduced.

In the present invention, the seal member may include a protrusion that extends between the first seal lip and the second seal lip in the entry direction of the foreign matter and extends toward the one member. .
According to the present invention, even if foreign matter or the like passes through the proximity portion or the sliding contact portion between the first seal lip and the first flange portion, the proximity portion between the second seal lip and the second flange portion is caused by the protrusion. Or it can suppress that a foreign material etc. penetrate | invade into a sliding contact part.

In the present invention, the seal member includes a metal core including a fitting portion that is fitted to the other member, and a rubber seal body including the first seal lip and the second seal lip, and the seal The body may be formed integrally with the metal core so as to cover the entire outer periphery of the fitting portion.
According to the present invention, since the entire outer periphery of the fitting portion with respect to the other member of the core metal is covered with the seal body, the sealing performance between the core metal and the other member can be enhanced. Moreover, since the seal member is sandwiched between the first flange portion and the second flange portion, there is no concern that the seal member is displaced in the axial direction, and the sealing performance between the core metal and the other member is maintained. .

  According to the sealing device of the present invention, the sealing performance can be further improved.

It is a schematic longitudinal cross-sectional view which shows an example of the wheel bearing apparatus for motor vehicles to 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 a 1st embodiment of a sealing device concerning the present invention. It is a figure similar to FIG. 2 which shows 2nd Embodiment of the sealing device which concerns on this invention. It is a figure similar to FIG. 2 which shows 3rd Embodiment of the sealing device which concerns on this invention. It is a figure similar to FIG. 2 which shows 4th Embodiment of the sealing device which concerns on this invention. It is a figure similar to FIG. 2 which shows 5th Embodiment of the sealing device which concerns on this invention. It is a figure similar to FIG. 2 which shows 6th Embodiment of the sealing device which concerns on this invention. It is a figure similar to FIG. 2 which shows 7th Embodiment of the sealing device which concerns on this invention. (A) (b) is the schematic of the principal part of the modification common to each 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 drive wheel (not shown) of an automobile so as to be rotatable. The bearing device 1 generally includes an outer ring (fixed side member, outer member) 2, a hub ring 3, an inner ring member 4 fitted and integrated on the vehicle body side of the hub ring 3, an outer ring 2, and a hub ring. 3 and a two-row rolling element (ball) 8 interposed between the inner ring member 4 and the inner ring member 4. In this example, the hub ring 3 and the inner ring member 4 constitute an inner ring (rotary member, inner member) 5. The outer ring 2 is fixed to a vehicle body (not shown) of the automobile. The hub wheel 3 is coaxially spline-fitted to a drive shaft 7 connected to a drive source (not shown) via a constant velocity joint 6, and is connected to the drive shaft 7 by a nut 7a so that it cannot be pulled out. ing. The inner ring 5 (the hub ring 3 and the inner ring member 4) can be coaxially rotated around the axis L with respect to the outer ring 2, and an annular space (bearing space) S is formed between the outer ring 2 and the inner ring 5. The In the bearing space S, the raceway 2a of the outer ring 2, the raceway 3a of the hub ring 3, and the raceway 4a of the inner ring member 4 can be rolled while two rows of rolling elements 8 are held by the retainer 8a. Is intervened. The hub wheel 3 has a cylindrical hub wheel body 30 and a hub flange 31 formed so as to extend radially outward from one wheel side end of the hub wheel body 30. The wheel is attached and fixed by the illustrated nut.
In the present specification, the side facing the wheel along the axis L direction (the side facing the left side in FIG. 1) is referred to as the wheel side, and the side facing the vehicle body (the side facing the right side) is referred to as the vehicle body side.

  Bearing seals 9 and 10 are mounted at both ends of the bearing space S along the axis L direction, between the outer ring 2 and the hub ring 3 and between the outer ring 2 and the inner ring member 4, so that the bearing space is provided. Both ends along the axis L direction of S are sealed. This prevents entry of foreign matter such as muddy water into the bearing space S and leakage of the lubricant (grease, etc.) filled in the bearing space S to the outside. These bearing seals 9 and 10 correspond to the sealing device of the present invention. As one embodiment of the sealing device according to the present invention, a bearing seal (sealing device) 10 on the vehicle body side will be described below with reference to FIG. To do.

  The bearing seal 10 shown in FIG. 2 includes a first slinger 11 having an L-shaped section that is fitted to the outer diameter surface 4 b of the inner ring member 4 (inner ring), and a second L-shaped section that is fitted to the first slinger 11. A slinger and a seal member 13 fixed to the inner diameter surface 2b of the outer ring 2 are configured. More specifically, the first slinger 11 includes a first cylindrical portion 11a and a first flange portion 11b that extends radially outward from one end portion 11c in the axis L direction of the first cylindrical portion 11a. In other words, the first slinger 11 includes the first flange portion 11b and the first cylindrical portion 11a extending in the axis L direction from one end portion (radial end portion) 11c on the radially inner side of the first flange portion 11b. Become. The second slinger 12 includes a second cylindrical portion 12a and a second flange portion 12b extending radially outward from one end portion 12c in the axis L direction of the second cylindrical portion 12a. In other words, the second slinger 12 includes the first flange portion 12b and the second cylindrical portion 12a extending in the axis L direction from one end portion (radial end portion) 12c on the radially inner side of the second flange portion 12b. Become. The first slinger 11 is fitted to the outer diameter surface 4b of the inner ring member 4 via the first cylindrical portion 11a, but the first flange portion 11b is opposite to the bearing space S with respect to the first cylindrical portion 11a. It fits so that it may be located in. The second slinger 12 is fitted (externally fitted) to the cylindrical portion 11a of the first slinger 11 via the second cylindrical portion 12a, but the second flange portion 12b is a bearing space S with respect to the second cylindrical portion 12a. It is fitted so as to be located on the side. The first slinger 11 is made of a non-rusting metal material such as a stainless steel plate (for example, SUS340), and the second slinger 12 is made of a metal material that is easily rusted such as a SPCC steel plate.

  The seal member 13 includes a metal core 14 fitted to the inner diameter surface 2 b of the outer ring 2, and a rubber seal body 15 that is integrally fixed to the metal core 14. The metal core 14 has an L-shaped cross section, and has a cylindrical portion (hereinafter referred to as a metal core cylindrical portion) 14a fitted to the inner diameter surface 2b of the outer ring 2, and a diameter from one end portion 14c in the axis L direction of the metal core cylindrical portion 14a. It consists of a flange portion (hereinafter referred to as a core metal flange portion) 14b extending inward in the direction. The cored bar cylindrical part 14a of the cored bar 14 is fitted as a fitting part with respect to the inner diameter surface 2b of the outer ring 2 so that one end part 14c faces the bearing space S side. The seal body 15 includes first seal lips 16, 17, second seal lips 18, 19, and third seal lips 20, 21, and is integrally formed with the cored bar 14 by rubber vulcanization molding. The first seal lips 16, 17 are axial lips, and their tip portions 16 a, 17 a are formed so as to elastically contact the surface of the first flange 11 b facing the bearing space S side of the first slinger 11. The second seal lips 18 and 19 are also axial lips, and their tip portions 18a and 19a are formed so as to elastically contact the surface of the second slinger 12 facing the opposite side to the bearing space S of the second flange portion 12b. The Further, the third seal lips 20 and 21 are radial lips, and the tip portions 20 a and 21 a are formed so as to elastically contact the outer diameter surface of the second cylindrical portion 12 a of the second slinger 12. The tip portions 16a and 17a of the first seal lips 16 and 17 and the tip portions 18a and 19a of the second seal lips 18 and 19 are brought into contact with the first flange portion 11b and the second flange portion 12b as the inner ring 5 rotates. Elastically sliding. Further, the distal end portions 20a and 21a of the third seal lip elastically slidably contact the outer diameter surface of the second cylindrical portion 12a as the inner ring 5 rotates. In FIG. 2, the portion indicated by the two-dot chain line of each seal lip shows the original shape of each seal lip and does not involve deformation due to the elastic contact. The seal body 15 further includes a wraparound portion 22 that wraps around the other end 14d in the axis L direction of the core metal cylindrical portion. The wraparound portion 22 is formed when the core metal cylinder portion 14a is fitted to the outer ring 2, and the outer ring 2 2 is interposed between the inner diameter surface 2b and the cored bar cylindrical portion 14a in a compressed state. The wraparound portion 22 is integrated with the core metal 14 so as to cover a part of the core metal cylindrical portion 14 a as a fitting portion with respect to the outer ring 2. In FIG. 2, a portion indicated by a two-dot chain line of the wraparound portion 22 indicates an original shape before being compressed. The core metal 14 is made of a metal material that easily rusts, such as an SPCC steel plate. A part of the core bar 14 facing the opposite side to the bearing space S and a part facing the bearing space S are covered with the seal body 15.

  A labyrinth portion r is formed between the outermost diameter side edge portion 11d of the first slinger 11 in the bearing seal 10 and the other end portion 14d of the cored bar cylindrical portion 14a covered with the wraparound portion 22, and this labyrinth. The portion r is on the vehicle body side and opens to the outside air side. Therefore, in the automotive bearing device 1, foreign matter such as muddy water tends to enter the bearing seal 10 from the labyrinth portion r. An arrow a conceptually indicates the intrusion direction of foreign matter such as muddy water. In the present embodiment, the tip portions 16a to 19a of the plurality of first seal lips 16 and 17 and the plurality of second seal lips 18 and 19 that are axial lips are opposed to the intrusion direction a. Is directed to. Further, of the third seal lips 20 and 21 which are radial lips, the front end 20a of the seal lip 20 faces the intrusion direction a, and the front end 21a of the seal lip 21 follows the intrusion direction a. Each (in the forward direction).

  In the bearing device 1 including the bearing seal 10 configured as described above, the inner ring 5 rotates coaxially with the outer ring 2 as the drive shaft 7 rotates about the axis L. By this axial rotation of the inner ring 5, the tip portions 16a, 17a of the first seal lips 16, 17 are elastically slidably contacted with the first flange portion 11b. Further, the end portions 18a and 19a of the second seal lips 18 and 19 are elastically slidably contacted with the second flange portion 12b. Further, the tip portions 20a, 21a of the third seal lips 20, 21 are elastically slidably contacted with the second cylindrical portion 12a. Due to the elastic relative sliding contact between the first slinger 11 and the second slinger 12 of the tip portions 16a to 21a of the seal lips 16 to 21, foreign matters such as muddy water entering the bearing seal 10 from the labyrinth portion r The foreign matter is blocked from entering the bearing space S. In particular, since the front end portions 16a and 17a of the first seal lips 16 and 17 are directed so as to face the intrusion direction a of the foreign matter, the foreign matter that has entered from the labyrinth portion r enters the bearing space S side. Can be effectively blocked. Even if the tip portions 16a and 17a wear with time and foreign matter passes through the sliding contact portion with respect to the first flange portion 11b, the third seal lips 20 and 21 and the second seal lip portions 18 and 19 are used. This prevents foreign matter from further entering the bearing space S side. In particular, the tip 20a of the third seal lip 20 and the tips 18a, 19a of the second seal lips 18, 19 are oriented so as to face the foreign material intrusion direction a. Intrusion is blocked more effectively.

  Further, in the bearing space S, a lubricant (not shown) such as grease is filled in order to make the rolling elements 8... Smoothly roll, but external leakage of the lubricant is also prevented by the bearing seal 10. The In particular, the second flange portion 12b located on the bearing space S side functions as a barrier. Further, since the tip portion 21a of the third seal lip 21 is directed so as to face the leakage direction of the lubricant (the direction opposite to the foreign material intrusion direction a), the leakage of the lubricant is effectively prevented. . Furthermore, the wraparound portion 22 formed in the seal body 15 is interposed between the core metal 14 and the outer ring 2 in a compressed state, so that foreign matter such as muddy water is removed from the fitting portion between the outer ring 2 and the core metal 14. Intrusion into the bearing space S is prevented. Thus, even if the second slinger 12 and the cored bar 14 are made of a metal material such as an inexpensive SPCC steel plate by preventing foreign matter such as muddy water from entering the bearing space S, these metals can be used. The material is hardly exposed to muddy water and rusting is suppressed. On the other hand, although the 1st slinger 11 is located in the site | part which is easy to be exposed to muddy water etc., since it consists of a nonrusting metal material, there is no fear of rusting. And since the sealing member 13 is pinched | interposed into the 1st flange part 11b and the 2nd flange part 12b, there is no fear that the sealing member 13 may shift | deviate to the axis L direction, and the sealing between the said metal core 14 and the outer ring | wheel 2 is carried out. Sex is maintained.

FIG. 3 is a second embodiment of the sealing device according to the present invention, and corresponds to a modification of the first embodiment. In the bearing seal (sealing device) 10A of this embodiment, the third seal lips 20, 21 are not present, and the second slinger 12 is connected to the bearing space S from the outer diameter side end of the second flange portion 12b. Is different from the first embodiment in that it includes an extended cylindrical portion 12d extending to the opposite side. In the bearing seal 10A of this embodiment, the extended cylindrical portion 12d is positioned like a baffle plate with respect to the foreign material intrusion direction a (see FIG. 2). The intrusion is effectively prevented. Further, the extended cylindrical portion 12d is effective for preventing leakage of the lubricant filled in the bearing space S. Since other configurations are the same as those of the first embodiment, common portions are denoted by the same reference numerals, and descriptions of the configurations, operations, effects, and the like are omitted.
3 to 8, illustration of the intrusion direction of the foreign matter is omitted, but in these drawings, the intrusion direction a of the foreign matter schematically shown in FIG. 2 is assumed.

  FIG. 4 is a third embodiment of the sealing device according to the present invention, and corresponds to another modification of the first embodiment. In the bearing seal (sealing device) 10B of this embodiment, the slinger is composed only of the first slinger 11, and the first slinger 11 is U-shaped in cross section and has two flange portions 11b and 11e. The flange portion 11b on the opposite side to the bearing space S is the first flange portion, and the flange portion 11e on the bearing space S side is the second flange portion. Further, the cored bar 14 is formed in an L-shaped cross section as in the first and second embodiments. In a state where the cored bar 14 is fitted to the outer ring 2, the connecting part 14c of the cored bar cylindrical part 14a and the cored bar flange part 14b is arranged to face the vehicle body side. The cored bar cylindrical portion 14 a is fitted to the inner diameter surface 2 b of the outer ring 2 through the metal ring 23. The metal ring 23 includes a cylindrical portion (hereinafter referred to as a metal ring cylindrical portion) 23a fitted to the inner diameter surface 2b of the outer ring 2 and a radially inner side from one end portion 23c on the bearing space S side of the metal ring cylindrical portion 23a. It consists of an extending flange part (metal ring flange part) 23b. A part of the metal ring flange part 23b and a part of the second flange part 11e of the first slinger 11 are formed so as to overlap each other with a small gap in the direction of the axis L (see FIG. 1).

  The seal member 13 includes the core metal 14 and a rubber seal body 15 formed integrally with the core metal 14. The seal body 15 has one first seal lip 16, one second seal lip 18, and two third seal lips 20 and 21. The first seal lip 16 and the second seal lip 18 are both axial lips, and are formed so as to elastically contact the first flange portion 11b and the second flange portion 11e, respectively. The third seal lips 20 and 21 are radial lips, and are formed so as to elastically contact the first cylindrical portion 11 a of the first slinger 11. And the front-end | tip parts 16a and 18a of the 1st seal lip 16 and the 2nd seal lip 18 are orient | assigned so as to oppose the penetration | invasion direction a (refer FIG. 2) of a foreign material similarly to 1st Embodiment. The tip 20a of the third seal lip 20 is directed to face the foreign material intrusion direction a (same as above), and the tip 21a of the third seal lip 21 follows the foreign material intrusion direction a (same as above). Is directed so that. The seal body 15 covers the entire surface on the side opposite to the bearing space S from a part of the surface on the bearing space S side of the core metal flange portion 14b, and also covers the one end portion 14c of the core metal cylindrical portion 14a. It is integrated with the cored bar 14. A portion covering the one end portion 14c of the seal body 15 is an annular enormous portion 24 formed thick. The annular enormous portion 24 has a maximum outer diameter slightly larger than the inner diameter of the inner surface 2 b of the outer ring 2, and when the core metal cylindrical portion 14 a is fitted to the inner surface 2 b of the outer ring 2, the inner surface 2 b of the outer ring 2. And the one end portion 14c in a compressed state. A portion indicated by a two-dot chain line of the annular enormous portion 24 in FIG. 4 indicates an original shape before being compressed. In this embodiment, the first slinger 11 is made of a non-rusting metal material as described above, and the core metal 14 and the metal ring 23 are made of a metal material that is easily rusted such as SPCC. Before the first slinger 11 is combined with the seal member 12, the first slinger 11 is formed with an extension extending from the first cylindrical portion 11a along the axial direction. When the first slinger 11 is combined with the seal member 13, the second flange portion 12 e is formed while the extension portion of the first cylindrical portion 11 a is bent so as to stand on the side opposite to the bearing space S. The slinger 11 is combined with the seal member 13.

  In the bearing seal 10B of the present embodiment, the first seal lip 16, the second seal lip 18, and the third seal lips 20, 21 have a sealing function similar to that of the first embodiment. Further, since the second flange portion 11e and the metal ring flange portion 23b are formed so as to overlap with each other in the axial direction, the foreign matter temporarily passes through the sliding contact portion between the second seal lip 18 and the second flange portion 11e. Even so, the labyrinth effect of this overlapping portion prevents foreign matter from reaching the bearing space S. Further, the lubricant filled in the bearing space S is also prevented from entering the bearing seal 10B, and the sealing functions of the first seal lip 16, the second seal lip 18, and the third seal lips 20, 21 are also compatible. Thus, leakage of the lubricant to the outside of the bearing device 1 is also prevented. Furthermore, since the annular enormous portion 24 of the seal body 15 is interposed in a compressed state between the core metal cylindrical portion 14a and the inner diameter surface 2b of the outer ring 2, the outer ring 2 via the metal ring 23 of the core metal cylindrical portion 14a It is difficult for muddy water or the like to enter the bearing space S through the fitting portion, and rusting of the metal core 14 and the metal ring 23 is also suppressed. Since other configurations are the same as those of the above-described embodiment, common portions are denoted by the same reference numerals, and descriptions of the configurations, operations, effects, and the like are omitted.

  FIG. 5 shows a fourth embodiment of the sealing device according to the present invention. The bearing seal (sealing device) 10C of this embodiment is different from that of the first embodiment in the structure of the seal member 13 and the structure of fixing the seal member 13 to the outer ring 2. That is, a circumferential groove 2 c is formed on the inner diameter surface 2 b of the outer ring 2, and the core metal 14 is fixed to the circumferential groove 2 c through the seal body 15 by fitting. The cored bar 14 is formed of a plate-shaped annular body, and the inner diameter side edge portion 14e and the outer diameter side edge portion 14f are shaped so as to protrude to the opposite side of the bearing space S along the direction of the axis L (see FIG. 1). The outer diameter side edge portion 14f is a fitting portion that is fitted into the circumferential groove 2c of the outer ring 2. The seal body 15 covers the entire outer periphery of the outer diameter side edge portion (fitting portion) 14f. The seal body 15 is integrated with the core metal S so as to go around the inner diameter side edge 14e from the surface opposite to the bearing space S of the core metal 14 to reach the surface on the bearing space S side. The portion covering the outer diameter side edge portion 14f of the seal body 15 is an annular enormous portion 25 formed so that the maximum outer diameter is slightly larger than the maximum inner diameter of the circumferential groove 2c. When fitted to 2c, it is interposed between the outer ring 2 and the cored bar 14 in a compressed state. A portion indicated by a two-dot chain line of the annular enormous portion 25 in FIG. 5 indicates an original shape before being compressed.

  In this embodiment, the first slinger 11 and the second slinger 12 are provided as in the first embodiment, and both the slinger 11 and 12 have an L-shaped cross section, and are combined in the same manner as in the first embodiment. The outer diameter surface 4b of the member 4 is fitted. The seal body 15 includes two first seal lips 16 and 17 and second seal lips 18 that elastically contact the first flange portion 11b and the second flange portion 12b of the first slinger 11 and the second slinger 12, respectively. 19. Further, the seal body 15 is provided with a projection 26 extending toward the inner ring member 4 on the inner diameter side portion thereof. The protrusion 26 is located between the first seal lips 16, 17 and the second seal lips 18, 19 and is formed so that the protruding end faces the outer diameter surface of the cylindrical portion 12 a of the second slinger 12. ing. Also in this embodiment, the 1st slinger 11 consists of non-rusting metal materials, such as stainless steel, the 2nd sling 12 and the metal core 14 consist of metal materials which are easy to rust, such as SPCC.

  In the bearing seal 10C of the present embodiment, the first seal lips 16, 17 and the second seal lips 18, 19 exhibit the same sealing function as in the first embodiment. Even if the tip portions 16a and 17a of the first seal lips 16 and 17 are worn over time, foreign matter or the like passes through the sliding contact portion between the first seal lips 16 and 17 and the first flange portion 11b. Further, the protrusion 26 prevents further intrusion. As a result, it is possible to prevent foreign matter and the like from entering the sliding contact portion between the second seal lips 18 and 19 and the second flange portion 12b. Furthermore, even if foreign matter or the like passes between the projection 26 and the second cylindrical portion 12a, the tip portions 18a and 19a of the second seal lips 18 and 19 are directed to face the foreign material intrusion direction a. Therefore, intrusion of further foreign matter is prevented. Since the enormous annular portion 25 is interposed between the outer ring 2 and the core metal 14 in a compressed state, muddy water or the like enters the bearing space S through the fitting portion between the outer edge portion 14f and the outer ring 2. Is difficult to penetrate, and rusting of the portion exposed to the bearing space S side of the cored bar 14 is also suppressed. Since other configurations are the same as those of the above-described embodiment, common portions are denoted by the same reference numerals, and descriptions of the configurations, operations, effects, and the like are omitted.

  FIG. 6 is a fifth embodiment of the sealing device according to the present invention, and corresponds to a modification of the fourth embodiment. The bearing seal (sealing device) 10D of this embodiment has a bent piece portion 11f that is bent from the one end portion 11c of the first cylindrical portion 11a of the first slinger 11 to the inner diameter side, and this bent piece portion 11f. The first flange portion 11b is formed so as to be folded back to the outer diameter side. The O-ring rubber packing 27 having a circular cross section is compressed between the bent base portion of the bent piece portion 11f and the chamfered corner portion 4d of the outer diameter surface 4b of the inner ring member 4 and the vehicle body side end surface 4c. Intervened. Thus, the rubber packing 27 is interposed between the first slinger 11 and the inner ring member 4 in a compressed state, so that the first cylindrical portion 11a of the first slinger 11 and the outer diameter surface 4b of the inner ring member 4 are in contact with each other. Intrusion of foreign matter or the like into the bearing space S from the fitting portion is suppressed. Since other configurations are the same as those of the fourth embodiment, common portions are denoted by the same reference numerals, and descriptions of the configurations, operations, effects, and the like are omitted.

  FIG. 7 is a sixth embodiment of the sealing device according to the present invention, and corresponds to a modification of the fifth embodiment. The bearing seal (sealing device) 10E of this embodiment differs from that of the fifth embodiment in that a rubber seal portion 28 having a sawtooth cross section is used instead of the rubber packing 27 in the fifth embodiment. The rubber seal portion 28 is formed integrally with the surface of the bent piece portion 11f on the bearing space S side, and is interposed in a compressed state between the bent piece portion 11f and the vehicle body side end surface 4c of the inner ring member 4. To do. Thus, the rubber seal portion 28 is interposed between the first slinger 11 and the inner ring member 4 in a compressed state, so that the first cylindrical portion 11a of the first slinger 11 and the outer diameter surface 4b of the inner ring member 4 Intrusion of foreign matter or the like into the bearing space S from the fitting portion is suppressed. Since other configurations are the same as those of the fourth and fifth embodiments, common portions are denoted by the same reference numerals, and descriptions of the configurations, operations, effects, and the like are omitted.

  FIG. 8 is a seventh embodiment of the sealing device according to the present invention, and corresponds to another modification of the fourth embodiment. In the bearing seal (sealing device) 10F of this embodiment, the slinger is composed only of the first slinger 11, and the first slinger 11 has a U-shaped cross section and has two flange portions 11b and 11e. The flange portion 11b on the opposite side to the bearing space S is the first flange portion, and the flange portion 11e on the bearing space S side is the second flange portion. The second seal lip is composed of only the second seal lip 18, and the second seal lip 18 is in elastic contact with the surface opposite to the bearing space of the second flange portion 11 e constituting the first slinger 11. It is configured. The second flange portion 11e is formed so as to include an extension portion that extends to the bearing space S side of the first cylindrical portion 11a. After the combination with the seal member 13, the extension portion of the first cylindrical portion 11a is connected to the bearing space S. Is formed by bending to stand on the opposite side. As described above, since the slinger is composed of only the first slinger 11, an increase in the number of parts can be suppressed. Since other configurations are the same as those of the fourth embodiment, common portions are denoted by the same reference numerals, and descriptions of the configurations, operations, effects, and the like are omitted.

  In each of the above-described embodiments, one or two examples of the first seal lip and the second seal lip are described. However, the number of these seal lips is not limited to the illustrated example. The first seal lip and the second seal lip are both in elastic contact (sliding contact) with the flange portion, but may be close to each other. In addition, as long as the first seal lip and the second seal lip according to the present invention are directed so as to face the foreign material intrusion direction a, the direction in which the tip portion faces is not limited. For example, as shown to Fig.9 (a), you may form so that the front-end | tip part 18a (18b) of the 2nd seal lip 18 (19) may face the opposite side to the 2nd flange part 12b (11e). Further, as shown in FIG. 9B, the tip end portion 18a (18b) of the second seal lip 18 (19) may be formed to face the second flange portion 12b (11e) side.

  Further, in each embodiment, the rotation side member is the inner member and the fixed side member is the outer member, but the rotation side member may be the outer member and the fixed side member may be the inner member. In addition, one member to which the slinger is fixed is an inner member on the rotation side, and the other member to which the seal member is fixed is an outer member on the fixed side. May be fixed to the outer member on the rotation side. In addition, the example in which the sealing device according to the present invention is applied to a bearing device for a wheel support portion of an automobile has been described. However, the present invention is not limited to this, and a bearing device for supporting a pump shaft of a water pump for an automobile and other industries. The present invention can also be applied to mechanical bearing devices. The bearing device 1 shown in FIG. 1 is a so-called third-generation automobile bearing device, but the sealing device of the present invention can also be applied to first-generation and second-generation automobile bearing devices. Also in this case, the sealing device mounted on the wheel side and the vehicle body side is a target.

2 Outer ring (fixed side member, outer member)
3 Hub wheel (rotary member, inner member)
4 Inner ring member (rotating side member, inner member)
5 Inner ring (rotary side member, inner member)
10, 10A-10F Bearing seal (sealing device)
11 1st slinger 11a 1st cylindrical part 11b 1st flange part 11c One end part (radial direction edge part)
11e 2nd flange part 12 2nd slinger 12a 2nd cylindrical part 12b 2nd flange part 12c One end part (radial direction edge part)
13 Seal member 14 Core 14a Core metal cylindrical part (fitting part)
14f Outer diameter side edge (fitting part)
15 Seal body 16, 17 First seal lip 16a, 17a Tip 17 Seal lip member 18, 19 Second seal lip 18a, 19a Tip 26 Protrusion a Foreign material intrusion direction L axis S Bearing space (space)

Claims (5)

A sealing device for sealing a space between an inner member and an outer member that rotate relatively coaxially,
Including a slinger fixed to one of the inner member and the outer member, and a seal member fixed to the other of the inner member and the outer member,
The slinger includes a first flange portion positioned on the opposite side of the space from the seal member in the axial direction, and a second flange portion positioned on the space side of the seal member in the axial direction,
The seal member has a first seal lip that is close to or slidably contacted with the first flange portion, and a second seal lip that is close to or slidably contacted with the second flange portion,
Each of the first seal lip and the second seal lip includes a seal lip that is directed so as to oppose the intrusion direction of the foreign matter into the space from the outside. The sealing device according to claim 1,
The sealing device includes a plurality of the first seal lips and the second seal lips, respectively. The sealing device according to claim 1 or 2,
The slinger includes a first slinger including a first cylindrical portion extending from the radial end of the first flange portion and the first flange portion toward the space, and a diameter of the second flange portion and the second flange portion. A second slinger including a second cylindrical portion extending from the direction end to the opposite side of the space;
The first slinger is made of a non-rusting metal material, and the second slinger is made of a metal material that easily rusts. The sealing device according to any one of claims 1 to 3,
The sealing device includes a protrusion extending between the first seal lip and the second seal lip in the intrusion direction of the foreign matter and extending toward the one member. In the sealing device according to any one of claims 1 to 4,
The seal member includes a cored bar including a fitting portion to be fitted to the other member, and a rubber seal body including the first seal lip and the second seal lip.
The sealing device, wherein the sealing body is integrally formed with the core bar so as to cover the entire outer periphery of the fitting portion.

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