JP2011080498A - Wheel bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device for achieving the longer life of a bearing by preventing the wear of a seal to improve sealing performance. <P>SOLUTION: The seal 9 includes a pack seal comprising an annular seal plate 14 composed of a core 15 pressed into an end inner periphery of an outer member 10 and a seal member 16 having a side lip 16a integrally vulcanized and adhered to the core 15 and extended and inclined radially outward and a grease lip 16b and a dust lip 16c formed in a bifurcated shape at the inner diameter side, and a slinger 13 which is pressed into the outside diameter surface of an inner ring 3, having a circular tube section 13a in which the grease lip 16b is in slidable contact through a radial interference, and a vertical plate section 13b extending radially outward from the circular tube section 13a, in which the side lip 16a is in slidable contact through an axial interference. An annular solid lubricating member 18 composed of a polymer member containing a lubricating oil is attached to a corner of the circular tube section 13a of the slinger 13 and the vertical plate section 13b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wheel bearing device that rotatably supports a vehicle such as an automobile, and more particularly to a wheel bearing device that prevents seal wear and improves sealing performance and extends the life of the bearing. is there.

  2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like supports a hub wheel for mounting a wheel rotatably via a double row rolling bearing, and includes a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and an inner ring rotation method and an outer ring rotation method are generally used for driven wheels. Further, the wheel bearing device has a structure called a first generation in which a wheel bearing composed of a double row angular ball bearing or the like is fitted between a knuckle and a hub wheel constituting a suspension device. Second generation structure in which body mounting flange or wheel mounting flange is formed directly on the outer periphery of the member, third generation structure in which one inner rolling surface is directly formed on the outer periphery of the hub wheel, or hub wheel, etc. It is roughly classified into a fourth generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the speed universal joint.

  Since these wheel bearing devices are disposed at sites where muddy water or the like is easily applied, a sealing device is attached so as to seal between the outer member and the inner member. Here, when the bearing damage situation of the market-recovered product is verified, the damage due to the malfunction of the sealing device occupies more than the original bearing life resulting from peeling or the like. Therefore, it is possible to reliably improve the bearing life by increasing the sealing performance and durability of the sealing device.

  Conventionally, various types of seals with improved sealing performance have been proposed. A typical example of such a seal is shown in FIG. A seal 53 is attached to an opening of an annular space formed between the outer member 51 and the inner ring 52, and this seal 53 is formed in a substantially L-shaped cross section and arranged in an opposed manner to each other. A pack seal composed of 54 and slinger 55 is formed.

  The slinger 55 includes a cylindrical portion 55a that is press-fitted into the outer diameter of the inner ring 52, and a standing plate portion 55b that extends radially outward from the cylindrical portion 55a. On the other hand, the seal plate 54 is attached to the outer member 51 so as to face the slinger 55, and the cored bar 56 press-fitted into the inner periphery of the end of the outer member 51 is integrally joined to the cored bar 56 by vulcanization adhesion. And a sealing member 57.

  The seal member 57 is made of synthetic rubber such as nitrile rubber, and includes a side lip 57a that is in sliding contact with the standing plate portion 55b of the slinger 55, and a pair of radial lips 57b and 57c that are in sliding contact with the cylindrical portion 55a. The outer edge of the standing plate portion 55b of the slinger 55 is opposed to the seal member 57 via a slight radial clearance to form a labyrinth seal.

  Here, a solid lubricant such as an organic molybdenum compound having excellent heat resistance is added to the inside of the wheel, and a predetermined amount of grease is sealed. In the seal 53, between the side lip 57a, the dust lip 57b, and the grease lip 57c that are in sliding contact with the slinger 55, the same grease 58 as the grease sealed inside the bearing is applied in advance. Furthermore, a wheel conditioning process is added after the grease is filled. By this acclimation operation, each lip 57a, 57b, 57c and the seal land (sliding contact surface) of the slinger 55 are uniformly interposed. As a result, the lip wear, especially, the initial wear of the lip is prevented to improve the sealing performance, and the grease sealed in the bearing is mixed with the grease 58 applied to the seal 53 during operation to be softened and hardened. The grease 58 does not deteriorate. Therefore, no grease leakage occurs from the side lip 57a or abnormal wear of the lips 57a, 57b, 57c, and a wheel bearing that ensures sealability for a long period of time and extends the life of the bearing. An apparatus can be provided (for example, refer to Patent Document 1).

JP 2008-19988 A

  In such a conventional hermetic seal 53, the same grease 58 as the grease enclosed in the bearing is preliminarily applied between the side lip 57a, the dust lip 57b, and the grease lip 57c that are in sliding contact with the slinger 55. In particular, it is possible to provide a wheel bearing device that prevents the initial wear of the lip, ensures the sealing performance, and extends the life of the bearing. However, in an environment where muddy water or the like is applied over a long period of time, the pre-applied grease 58 is gradually discharged, and there is a possibility that lip wear may occur due to the sand contained in the infiltrated muddy water. .

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wheel bearing device that prevents seal wear and improves sealing performance and extends the life of the bearing.

  In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel for attaching a wheel to one end. A hub ring having a mounting flange integrally formed with a small-diameter step portion extending in the axial direction on the outer periphery, and an inwardly-turning roller that is fitted to the small-diameter step portion of the hub wheel and faces the double-row outer rolling surface. An inner member composed of an inner ring formed with a running surface or an outer joint member of a constant velocity universal joint, and a double row of rolling elements accommodated between both rolling surfaces of the inner member and the outer member. A moving body and a seal mounted in an opening of an annular space formed between the outer member and the inner member, and at least one of the seals is formed in a substantially L-shaped cross section. Consists of a pack seal consisting of an annular seal plate and a slinger arranged opposite to each other And a metal core having a cylindrical fitting portion press-fitted into the inner periphery of the end portion of the outer member, and a vertical plate extending radially inward from the fitting portion, and the metal core And a sealing member having a grease lip formed on the inner diameter side of the side lip, and the slinger includes the inner member. A cylindrical portion that is press-fitted into the outer diameter surface of the cylinder, and the grease lip is slidably contacted via a predetermined radial shimillo, and extends radially outward from the cylindrical portion, and the side lip passes through a predetermined axial shimiro In the wheel bearing device including the standing plate portion that is slidably contacted, a solid lubricating member is mounted in the vicinity of the lip slidable contact portion of the slinger.

  As described above, a seal mounted on the opening of the annular space formed between the outer member and the inner member is provided, and at least one of these seals is formed in a substantially L-shaped cross section. A cylindrical seal portion that is formed by a pack seal composed of an annular seal plate and a slinger arranged opposite to each other, and the seal plate is press-fitted into the inner periphery of the end portion of the outer member, and from this fit portion A cored bar having a standing plate portion extending radially inward, a side lip integrally vulcanized and bonded to the cored bar and extending obliquely outward in the radial direction, and a grease formed on the inner diameter side of the side lip A cylindrical portion in which the slinger is press-fitted into the outer diameter surface of the inner member and the grease lip is slidably contacted through a predetermined radial shimoshiro, and radially outward from the cylindrical portion. Extending to the side In a wheel bearing device comprising a standing plate portion that is slidably contacted via a predetermined axial shimiro, a solid lubricating member is mounted in the vicinity of the slinger lip slidable portion. As a result, the lubricating component in the solid lubricating member oozes out, and not only the grease lip of the sealing member but also the oil film is formed on the sliding contact part of the side lip by the centrifugal force due to rotation, preventing lip wear and improving the sealing performance In addition, it is possible to provide a wheel bearing device in which the intrusion into the inside of the bearing is prevented by repelling the muddy water that has entered, and the life of the bearing is extended.

  Preferably, as in the invention described in claim 2, if the solid lubricating member is formed in an annular shape, an oil film is effectively formed on the lip sliding contact portion of the seal member to prevent lip wear. Sealability can be improved.

  Further, as in the invention described in claim 3, the solid lubricating member may be formed of a polymer member containing lubricating oil.

  According to a fourth aspect of the present invention, the solid lubricating member is formed of a plastic grease obtained by heating and melting a mixture of a resin such as ultrahigh molecular weight polyethylene or ultrahigh molecular weight polyolefin and grease, and solidifying by cooling. May be.

  Further, as in the invention described in claim 5, the solid lubricating member may be formed of a porous member containing lubricating oil.

  Further, as in the sixth aspect of the present invention, the solid lubricating member may be formed of a solid lubricant.

  Further, as in the invention according to claim 7, if the solid lubricating member has a substantially L-shaped cross section from the cylindrical portion of the slinger to the lip sliding contact portion of the standing plate portion, An oil film is effectively formed on the lip sliding contact portion.

  Further, as in the invention described in claim 8, the end portion of the cylindrical portion of the cored bar is formed to be thinner than other portions and reduced in diameter, and is formed on the outer surface of the end portion of the cylindrical portion. If the sealing member is wrapped and fixed, the fixing force of the sealing member becomes strong, and the airtightness of the fitting portion with the outer member can be maintained over a long period of time.

  Further, as in the ninth aspect of the invention, the seal member has a pair of side lips extending obliquely outward in the radial direction and a grease lip extending inclined toward the bearing inner side on the inner diameter side. If this is done, a space for mounting the solid lubricating member can be secured, and foreign matter such as muddy water can be prevented from entering the inside of the bearing from the outside to improve the sealing performance.

  Further, as in the invention according to claim 10, if the slinger is formed from a steel plate having rust prevention ability by press working, rusting is prevented over a long period of time and durability is improved. Can do.

  The wheel bearing device according to the present invention integrally has an outer member integrally formed with a double row outer rolling surface on the inner periphery, and a wheel mounting flange for mounting the wheel on one end, and on the outer periphery. A hub ring formed with a small-diameter step portion extending in the axial direction, and an inner ring or a constant speed fitted with the small-diameter step portion of the hub ring and formed with an inner rolling surface facing the outer rolling surface of the double row An inner member composed of an outer joint member of a universal joint, a double row rolling element that is rotatably accommodated between both rolling surfaces of the inner member and the outer member, and the outer member and the inner member. And an annular seal formed at the opening of an annular space formed between the members and at least one of the seals having a substantially L-shaped cross section and arranged opposite to each other A pack seal composed of a plate and a slinger, and the seal plate A cylindrical fitting portion press-fitted into the inner periphery of the end portion of the member, and a core metal having a standing plate portion extending radially inward from the fitting portion, and vulcanized and bonded integrally to the core metal, in the radial direction And a sealing member having a grease lip formed on the inner diameter side of the side lip, and the slinger is press-fitted into the outer diameter surface of the inner member, A cylindrical portion in which the slip is slidably contacted via a predetermined radial shimillo, and a vertical plate portion that extends radially outward from the cylindrical portion and the side lip is slidably contacted via the predetermined axial shimillo In the wheel bearing device, since the solid lubricating member is mounted in the vicinity of the lip sliding contact portion of the slinger, the lubricating component in the solid lubricating member oozes as the bearing operability increases, and this is the grease of the seal member. In addition to the lip, an oil film is formed at the sliding contact part of the side lip by the centrifugal force due to rotation, preventing lip wear and improving the sealing performance, and intruding into the bearing by repelling muddy water etc. Thus, it is possible to provide a wheel bearing device that can prevent and extend the life of the bearing.

It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. It is a principal part enlarged view which shows the seal part of FIG. It is a principal part enlarged view which shows the modification of the seal | sticker of FIG. It is a principal part enlarged view which shows the seal | sticker of the conventional wheel bearing apparatus.

  An outer member integrally having a vehicle body mounting flange to be attached to the vehicle body on the outer periphery, a double row outer rolling surface formed integrally on the inner periphery, and a wheel mounting flange for mounting a wheel on one end A hub wheel integrally formed and having an inner rolling surface facing one of the outer rolling surfaces of the double row on the outer periphery, and a small-diameter step portion extending in the axial direction from the inner rolling surface, and the hub wheel An inner member comprising an inner ring that is press-fitted into a small-diameter step portion and has an outer race formed with an inner race surface facing the other of the outer row raceways in the double row, and both the inner member and the outer member. A plurality of rolling elements accommodated between the rolling surfaces so as to be freely rollable, and a seal attached to an opening of an annular space formed between the outer member and the inner member. Of which the inner side seal has a substantially L-shaped cross section and is disposed opposite to each other It is composed of a pack seal composed of a seal plate and a slinger, and the seal plate is a cylindrical fitting portion that is press-fitted into the inner periphery of the end portion of the outer member, and a stand that extends radially inward from the fitting portion. A cored bar having a plate part, a side lip that is integrally vulcanized and bonded to the cored bar and extends in a radially outward direction, and a grease lip and a dust lip formed in a bifurcated shape on the inner diameter side of the side lip A cylindrical member in which the slinger is press-fitted into the outer diameter surface of the inner ring, and the grease lip is slidably contacted via a predetermined radial shimoshiro, and radially outward from the cylindrical portion. In a wheel bearing device comprising a standing plate portion that extends in the direction and the side lip is slidably contacted via a predetermined axial squeeze, a polymer member containing lubricating oil at the cylindrical portion of the slinger and the corners of the standing plate portion Ranaru annular solid lubricant member is fitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, FIG. 2 is an enlarged view of a main part showing a seal part of FIG. 1, and FIG. 3 is a modified example of the seal of FIG. It is a principal part enlarged view shown. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  This wheel bearing device is for a drive wheel, and includes an inner member 1 and an outer member 10, and double row rolling elements (balls) 7 and 7 accommodated between the members 1 and 10 so as to be freely rollable. The third generation is configured. The inner member 1 includes a hub ring 2 and an inner ring 3 that is press-fitted and fixed to the hub ring 2.

  The hub wheel 2 integrally has a wheel mounting flange 4 for mounting a wheel at one end portion, one (outer side) inner rolling surface 2a on the outer periphery, and a cylinder extending in the axial direction from the inner rolling surface 2a. A small diameter step 2b is formed, and a serration (or spline) 2c for torque transmission is formed on the inner periphery. Further, hub bolts 5 are planted in the circumferentially equidistant positions of the wheel mounting flanges 4. The inner ring 3 is formed with the other (inner side) inner rolling surface 3a on the outer periphery, and is press-fitted into the small-diameter step portion 2b of the hub ring 2 through a predetermined squeeze.

  The hub wheel 2 is made of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and the wheel mounting flange 4 serving as a seal land portion of the outer side seal 8 to be described later, including the inner rolling surface 2a. The surface is hardened in the range of 58 to 64 HRC by induction hardening from the base 4a to the small diameter step 2b. On the other hand, the inner ring 3 and the rolling element 7 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core part by quenching.

  The outer member 10 integrally has a vehicle body mounting flange 10b to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and the inner rolling surfaces 2a and 3a of the inner member 1 on the inner periphery. Opposing double-row outer rolling surfaces 10a and 10a are integrally formed. Between these rolling surfaces 10a, 2a and 10a, 3a, double row rolling elements 7, 7 are accommodated via a cage 6 so as to roll freely. This outer member 10 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and at least double row outer raceway surfaces 10a and 10a are surfaced in the range of 58 to 64HRC by induction hardening. Has been cured.

  Seals 8 and 9 are attached to both ends of the outer member 10 to seal the opening of the annular space formed between the outer member 10 and the inner member 1. The seals 8 and 9 prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater and dust from the outside into the bearing. In addition, although the wheel bearing apparatus comprised by the double row angular contact ball bearing which used the ball as the rolling element 7 was illustrated here, it is not restricted to this, The double row tapered roller bearing which used the tapered roller for the rolling element 7 It may consist of.

  The outer-side seal 8 is an integral seal comprising a cored bar 11 press-fitted into the inner periphery of the outer-side end of the outer member 10 and a seal member 12 integrally joined to the cored bar 11 by vulcanization adhesion. It consists of The core 11 has a substantially L-shaped cross section by pressing from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). Is formed.

  On the other hand, the seal member 12 is made of a synthetic rubber such as ACM (polyacrylic rubber) or NBR (acrylonitrile-butadiene rubber), and has a pair of side lips 12a and 12b extending obliquely outward in the radial direction and radially inward. A grease lip 12c extending in an inclined manner is integrally provided. Further, the base 4a of the wheel mounting flange 4 is formed in an arc shape in cross section, and a pair of side lips 12a and 12b are slidably contacted with the base 4a via a predetermined axial nip, and the grease lip 12c is in a predetermined radial direction. It is in sliding contact with a shime-shiro.

  As shown in an enlarged view in FIG. 2, the inner side seal 9 is configured by a so-called pack seal including a slinger 13 and an annular seal plate 14 disposed to face each other. The slinger 13 is a ferritic stainless steel plate (JIS standard SUS430 series, etc.), an austenitic stainless steel plate (JIS standard SUS304 series, etc.), or a rust-proof cold rolled steel plate (JIS standard SPCC system). And the like, and a cylindrical portion 13a that is formed into an annular shape as a whole in a substantially L-shaped section by press working, and that is press-fitted into the outer diameter of the inner ring 3, and a standing plate that extends radially outward from the cylindrical portion 13a. Part 13b.

  On the other hand, the seal plate 14 is formed in an annular shape as a whole with a substantially L-shaped cross section, and is attached to the outer member 10. The seal plate 14 includes a metal core 15 and a seal member 16 that is vulcanized and bonded to the metal core 15. The core 15 is formed by press working from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). The cylindrical portion 15a is fitted into the end portion of the cylinder 10 and the upright plate portion 15b extends radially inward from the cylindrical portion 15a.

  The seal member 16 is made of a synthetic rubber such as NBR, and includes a side lip 16a extending obliquely outward in the radial direction, a grease lip 16b extending in a bifurcated manner, and a dust lip 16c on the inner diameter side. Yes. The side lip 16a is in sliding contact with a side surface on the outer side of the standing plate portion 13b of the slinger 13 via a predetermined axial shimiro, and the grease lip 16b and the dust lip 16c respectively apply a radial shimiro to the cylindrical portion 13a. Are in sliding contact with each other. In addition to NBR, the material of the seal member 16 includes, for example, HNBR (hydrogenated acrylonitrile-butadiene rubber), EPM, EPDM (ethylene / propylene rubber), etc., which have excellent heat resistance, heat resistance and chemical resistance. Examples thereof include ACM, FKM (fluoro rubber), and silicon rubber, which are excellent in properties.

  Further, the end portion of the cylindrical portion 15a of the cored bar 15a is formed thinner than the other portions and has a reduced diameter. And the sealing member 16 wraps around and adheres to the outer surface of the end portion of the cylindrical portion 15a to form an open end portion 17. Thereby, the adhering force of the seal member 16 is strengthened, and the airtightness of the fitting portion with the outer member 10 can be maintained over a long period of time.

  Here, in the present embodiment, an annular solid lubricating member 18 is mounted at the corners of the cylindrical portion 13a and the standing plate portion 13b of the slinger 13. This solid lubricating member 18 is a polymer member containing lubricating oil, for example, a mixture of lubricating oil such as ultra high molecular weight polyethylene and mineral oil (see Japanese Patent Publication No. 63-23239), impregnated with naphthenic lubricating oil. Conventionally known ones such as ultra high molecular weight polyethylene (see Japanese Patent Publication No. 3-67559), a composition comprising oil and polymethylpentene (see Japanese Patent Publication No. 54-22415) are applied.

  Thus, since the slinger 13 is externally fitted to the inner ring 3 serving as the rotation side member, and the solid lubricating member 18 is mounted at the corner of the slinger 13, the lubrication within the solid lubricating member 18 occurs as the bearing temperature rises. Oil oozes out, and this lubricating oil forms an oil film not only on the grease lip 16b and dust lip 16c of the seal member 16 but also on the sliding contact portion of the side lip 16a due to the centrifugal force caused by rotation, thereby preventing lip wear and sealing. It is possible to provide a wheel bearing device that improves the performance and prevents intrusion into the inside of the bearing by repelling muddy water that has entered, thereby extending the life of the bearing.

As the solid lubricating member 18, in addition to those described above, for example, a porous member made of a woven fabric, felt, sponge or the like containing lubricating oil, or a resin such as ultrahigh molecular weight polyethylene or ultrahigh molecular weight polyolefin A composition obtained by heating and melting a mixture with grease and solidifying by cooling, so-called plastic grease can be exemplified. This plastic grease has an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ⁶ ultrahigh molecular weight polyethylene of 95 to 1 wt%, and a lubricating grease having a dropping point higher than the gelation temperature of the ultra high molecular weight polyethylene of 5 to 99 wt%. After the mixture of the slinger 11 is filled in the corners of the slinger 11, the mixture is heated to a temperature equal to or higher than the gelation temperature of ultrahigh molecular weight polyethylene and then cooled and solidified.

As another example of the plastic grease, the above-mentioned ultrafine grease having a particle size of 1 to 100 μm is added to 5 to 99 wt% of lubricating grease having a dropping point higher than the gel point of an ultrahigh molecular weight polyolefin having an average molecular weight of about 1 × 10 ^{6 to} 5 × 10 ^6. High molecular weight polyolefin powder of 95 to 1 wt% may be mixed and dispersed and held at a temperature equal to or higher than the gel point. In either case, an oil oozing-inhibiting additive such as a solid wax may be added.

  The grease in the plastic grease is preferably a grease having at least the same base oil so that the consistency or the like does not change and the bearing life is not adversely affected when mixed in the grease filled in the bearing.

  FIG. 3 is a modification of the seal 9 of FIG. The same parts, the same parts, or parts or parts having the same functions as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The seal 19 is constituted by a pack seal including a slinger 13 and an annular seal plate 20 that are arranged to face each other. The seal plate 20 is formed in an annular shape as a whole with a substantially L-shaped cross section, and is attached to the outer member 10. The seal plate 20 includes a metal core 15 and a seal member 21 vulcanized and bonded to the metal core 15.

  The seal member 21 is made of a synthetic rubber such as NBR, and has a pair of side lips 21a and 21b extending obliquely outward in the radial direction, and a grease lip 21c extending inclined toward the bearing inner side on the inner diameter side. ing. The pair of side lips 21a and 21b are in sliding contact with the side surface on the outer side of the standing plate portion 13b of the slinger 13 via a predetermined axial shimiro, and the grease lip 21c is in contact with the cylindrical portion 13a via the radial shimiro. Are in sliding contact.

  Here, in this embodiment, the cross-section is substantially L-shaped from the cylindrical portion 13a of the slinger 13 to the lip sliding contact portion of the upright plate portion 13b, and the annular solid lubricating member 22 is attached as a whole. . The solid lubricating member 22 is made of a so-called solid lubricant such as graphite (graphite), boron nitride (h-BN), fluororesin (PTFE), molybdenum disulfide, tungsten disulfide and the like. The solid lubricating member 22 is preferably graphite or boron nitride that can be used in the form of particles or fibers or whiskers.

  Thus, the seal member 21 has a pair of side lips 21a and 21b extending obliquely outward in the radial direction, and a grease lip 21c extending inclined toward the bearing inner side on the inner diameter side, and the slinger 13 Since the solid lubricating member 22 is mounted from the cylindrical portion 13a to the lip sliding contact portion of the upright plate portion 13b, a mounting space for the solid lubricating member 22 can be secured, and foreign matter such as muddy water enters the bearing from the outside. As the bearing temperature rises, the solid lubricant is not only applied to the grease lip 21c of the seal member 21 but also to the sliding contact portion of the pair of side lips 21a and 21b by centrifugal force. Thus, an oil film can be effectively formed, and lip wear can be prevented to improve sealing performance.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The wheel bearing device according to the present invention is applied to first to fourth generation wheel bearing devices in which a pack seal is mounted in an opening of an annular space formed between an inner member and an outer member. Can do.

DESCRIPTION OF SYMBOLS 1 Inner member 2 Hub wheel 2a, 3a Inner rolling surface 2b Small diameter step part 2c Serration 3 Inner ring 4 Wheel mounting flange 5 Hub bolt 6 Cage 7 Rolling element 8 Outer side seal 9, 19 Inner side seal 10 Outer member 10a Outer rolling surface 10b Car body mounting flange 11, 15 Core metal 12, 16, 21 Seal member 12a, 12b, 16a, 21a, 21b Side lip 12c, 16b, 21c Grease lip 13 Slinger 13a, 15a Cylindrical portion 13b, 15b Plate portions 14, 20 Seal plate 16c Dustrip 17 Open end portions 18, 22 Solid lubricant member 51 Outer member 52 Inner ring 53 Seal 54 Seal plate 55 Slinger 55a Cylindrical portion 55b Standing plate portion 56 Core metal 57 Seal member 57a Side lip 57b Dustrip 57c Grease lip 58 Grease

Claims (10)

An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end, and a small diameter step portion extending in the axial direction on the outer periphery, and a small diameter step portion of the hub wheel are fitted, An inner member formed of an outer ring member of an inner ring or a constant velocity universal joint formed with an inner rolling surface facing the outer rolling surface;
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
A seal attached to an opening of an annular space formed between the outer member and the inner member;
At least one of these seals is composed of a pack seal composed of an annular seal plate and a slinger that are formed in a substantially L-shaped cross section and are arranged to face each other.
The seal plate has a cylindrical fitting portion that is press-fitted into the inner periphery of the end portion of the outer member, and a metal core having a standing plate portion that extends radially inward from the fitting portion; A side lip that is vulcanized and bonded to each other and extends obliquely outward in the radial direction, and a seal member having a grease lip formed on the inner diameter side of the side lip,
The slinger is press-fitted into the outer diameter surface of the inner member, and the grease lip is slidably contacted via a predetermined radial shimoshiro, and the side lip extends radially outward from the cylindrical portion. In the wheel bearing device comprising a standing plate portion that is slidably contacted through a predetermined axial direction shimiro,
A wheel bearing device, wherein a solid lubricating member is mounted in the vicinity of the lip sliding contact portion of the slinger.   The wheel bearing device according to claim 1, wherein the solid lubricating member is formed in an annular shape.   The wheel bearing device according to claim 1 or 2, wherein the solid lubricating member is formed of a polymer member containing lubricating oil.   The wheel bearing according to claim 1 or 2, wherein the solid lubricating member is formed of a plastic grease obtained by heating and melting a mixture of a resin such as ultra high molecular weight polyethylene or ultra high molecular weight polyolefin and grease and solidifying by cooling. apparatus.   The wheel bearing device according to claim 1 or 2, wherein the solid lubricating member is formed of a porous member containing lubricating oil.   The wheel bearing device according to claim 1 or 2, wherein the solid lubricating member is formed of a solid lubricant.   The wheel bearing device according to any one of claims 1 to 6, wherein the solid lubricating member has a substantially L-shaped cross section extending from a cylindrical portion of the slinger to a lip sliding contact portion of a standing plate portion.   The end portion of the cylindrical portion of the metal core is formed to be thinner than the other portion and reduced in diameter, and the sealing member is wrapped around and fixed to the outer surface of the end portion of the cylindrical portion. The wheel bearing device according to 1.   The wheel seal according to claim 1 or 8, wherein the seal member has a pair of side lips extending obliquely outward in the radial direction and a grease lip extending inclined toward the bearing inner side on the inner diameter side. Bearing device.   The wheel bearing device according to claim 1 or 7, wherein the slinger is formed by press working from a steel plate having rust prevention ability.

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