JP2011069420A - Wheel bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device having improved performance by enhancing the airtightness of a seal fitting part to improve sealing performance of a seal. <P>SOLUTION: A seal 20 is constituted of a slinger 11 and a seal plate 21 arranged opposite to each other. The slinger 11 consists of a cylindrical part 11a press-fitted in an inner ring 3 and a vertical plate part 11b extended radially outward. The seal plate 21 comprises a core metal 14 press-fitted in an end inner periphery of an outward member 10', and a seal member 22 made up of a pair of side lips 22a, 22b obliquely extended radially outward and brought into slide contact with the vertical plate part 11b and a grease lip 22c brought into slide contact with the cylindrical part 11a. A backup seal 24 is fitted to the outer side of a bearing of the seal 20, and formed of a cylindrical core metal 25 abutting on an opening end 23 of the seal plate 21 and a seal member 26 containing a seal lip 26a brought into slide contact with the vertical plate part 11b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like with respect to a suspension device, and more specifically, improves the airtightness of a seal fitting portion and improves the sealing performance of a seal attached to the bearing portion. The present invention relates to a wheel bearing device.

  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.

  These bearing portions are fitted with seals to prevent leakage of grease sealed inside the bearings and to prevent intrusion of rainwater, dust and the like from the outside. In recent years, the maintenance of automobiles has become more maintenance-free, and even longer bearing life has been demanded for wheel bearing devices. However, there are many cases in which rainwater, dust, or the like intrudes into the bearing and damages the bearing due to a sealing failure or a decrease in sealing performance. Therefore, it is possible to improve the bearing life by improving the sealing performance of the seal.

  Conventionally, various types of seals with improved sealing performance have been proposed. An example of such a seal is shown in FIG. The seal 50 is attached to an end of the outer member 51 and seals an opening of an annular space formed between the outer member 51 and the inner ring 52. The seal 50 includes a slinger 53 and an annular seal plate 54 that are arranged to face each other. The slinger 53 has a substantially L-shaped cross section formed by pressing from a steel plate, and includes a cylindrical portion 53a that is press-fitted into the inner ring 52, and a standing plate portion 53b that extends radially outward from the cylindrical portion 53a. .

  On the other hand, the seal plate 54 is formed in a substantially L-shaped cross section, and includes a metal core 55 that is press-fitted into the inner periphery of the end of the outer member 51, and a seal member 56 that is vulcanized and bonded to the metal core 55. The seal member 56 is made of an elastic member, and has a pair of side lips 56a and 56b that are in sliding contact with the standing plate portion 53b of the slinger 53, and a radial lip 56c that is in sliding contact with the cylindrical portion 53a. The side lips 56a and 56b are formed to be inclined toward the outer diameter side, and the tips thereof are in sliding contact with the standing plate portion 53b of the slinger 53 with a predetermined squeeze. Further, a magnetic encoder 57 is arranged on the side surface of the standing plate portion 53b of the slinger 53 so as to be a surface exposed portion 53c in which a circumferential surface on the radially outer side of the standing plate portion 53b is exposed.

  Further, a backup seal 58 is provided at the end of the outer member 51. The backup seal 58 includes a metal core 59 and a seal member 60 integrally joined to the metal core 59 by vulcanization adhesion. The metal core 59 is a cylindrical fitting portion 59 a that is press-fitted into the outer periphery of the end portion of the outer member 51, and a disk that extends radially inward from the fitting portion 59 a and is in close contact with the end surface of the outer member 51. A portion 59b, a cylindrical portion 59c extending in the axial direction from the disk portion 59b, and an inner end portion 59d extending further inward in the radial direction from the cylindrical portion 59c.

  On the other hand, the seal member 60 integrally extends with a seal lip 60a extending inward in the radial direction and in sliding contact with the surface exposed portion 53c of the slinger 53. This seal lip 60a can prevent rainwater, dust, and the like from directly entering the seal 50, and maintain bearing performance for a long period of time (see, for example, Patent Document 1).

JP 2008-151111 A

  In such a conventional seal 50, since the backup seal 58 is mounted in an exposed state at the end of the outer member 51, it is not only damaged by the collision of scattered objects, but also protrudes from the end surface of the outer member 51. Therefore, there was a risk of deformation or damage due to interference with other parts during transportation or assembly. In this case, there is room for improvement because the original sealing performance cannot be exhibited.

  The present invention has been made in view of such conventional problems, and it is intended to provide a wheel bearing device that has improved the airtightness of the seal fitting portion and improved the sealing performance of the seal. Objective.

  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 an outer rolling of the double row on the outer periphery. An inner member in which a double row inner rolling surface facing the surface is formed, and a double row accommodated between the rolling surfaces of the inner member and the outer member via a retainer so as to roll freely. A rolling bearing and a seal mounted on an opening of an annular space formed between the outer member and the inner member, wherein at least one of the seals is: It is composed of a slinger and an annular seal plate arranged to face each other, and the slinger has a cylindrical portion that is press-fitted into the inner member, and a standing plate portion that extends radially outward from the cylindrical portion, The seal plate is press-fitted into the inner periphery of the end of the outer member, and the core plate is bonded together by vulcanization adhesion. The side lip that is slidably in contact with the standing plate portion of the slinger via a predetermined axial sushi sill, and the slinger extends radially inward. And a seal member having a grease lip that is slidably contacted with the cylindrical portion via a predetermined radial squeeze, and a backup seal is mounted on the outer side of the bearing of the seal. A cylindrical metal core that is press-fitted into the inner periphery of the end portion, and a seal member that is integrally joined to the metal core by vulcanization adhesion and has a seal lip that extends obliquely inward in the radial direction. The slinger is slidably contacted with a standing plate portion of the slinger via a predetermined axial shimiro.

  As described above, in the wheel bearing device including the seal mounted in the opening of the annular space formed between the outer member and the inner member, at least one of the seals is disposed to face each other. The slinger has a cylindrical portion that is press-fitted into the inner member, and a standing plate portion that extends radially outward from the cylindrical portion. A metal core that is press-fitted into the inner periphery of the end of the member, and is integrally joined to the metal core by vulcanization adhesion, extends radially outwardly, and extends to the standing plate portion of the slinger through a predetermined axial shimiro The seal lip includes a side lip to be slidably contacted and a seal member having a grease lip that extends inwardly in a radial direction and is slidably contacted to the cylindrical portion of the slinger via a predetermined radial squeeze. Backup seal is installed on the side The back-up seal has a cylindrical metal core that is press-fitted into the inner periphery of the end of the outer member, and a seal lip that is integrally joined to the metal core by vulcanization and is inclined inward in the radial direction. Since the seal lip is slidably contacted with the slinger vertical plate portion through a predetermined axial squeezing mechanism, it prevents the rain seal and dust from entering the seal directly, and the backup seal Since it is mounted on the inner periphery of the end without protruding from the outer member, it will not be damaged by the impact of flying objects, and will not interfere with other parts during transportation or assembly. It is possible to provide a wheel bearing device capable of exhibiting sealing performance, further improving the airtightness of the fitting portion of the seal and improving the sealing performance of the seal.

  Further, as in the invention described in claim 2, the backup seal may be mounted on the outer diameter side of the seal plate so as to overlap the seal plate of the seal. As in the described invention, the backup seal may be in contact with the opening end of the seal plate of the seal. Thereby, the movement of the seal plate can be prevented and the side lip can be prevented from changing.

  Moreover, if the said seal | sticker has a pair of side lip like invention of Claim 4, a sealing performance can be improved.

  Further, as in the invention according to claim 5, even if the slinger moves due to the reaction force of the contact load of the pair of side lips in a single state, the grease lip is a cylindrical portion of the slinger. If it arrange | positions so that it may not drop from, seal separation can be prevented reliably.

  Further, as in the invention described in claim 6, the thickness of the side lip on the radially outer side of the pair of side lips is set to be thicker than the thickness of the side lip on the radially inner side. If so, the contact load of the radially outer side lip becomes larger than the contact load of the radially inner side lip, and the muddy water resistance of the seal can be improved.

  Further, as in the invention described in claim 7, the end portion of the cylindrical portion of the core metal of the seal is formed to be thinner and reduced in diameter than other portions, and the seal member wraps around the outer surface of the end portion. If it adheres, the adhesive force of a sealing member will become strong and the airtightness of the fitting part with an outer member can be maintained over a long period of time.

  Further, as in the invention according to claim 8, the end portion of the core metal of the backup seal is formed to have a smaller diameter than the other portion, and the seal member wraps around and adheres to the outer surface of the end portion. If it is done, the adhering force of the seal 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 inner member integrally has a wheel mounting flange for mounting a wheel at one end portion, and faces one of the double-row outer rolling surfaces on the outer periphery. An inner rolling surface, a hub wheel formed with a small-diameter step portion extending in the axial direction from the inner rolling surface, and a small-diameter step portion of the hub wheel, and the outer circumferential surface of the double row on the outer periphery. If the slinger is press-fitted into the outer diameter of the inner ring, the inner ring is press-fitted and fixed to the hub ring, and the inner ring becomes immobile after assembly. In addition, the seal is assembled easily and accurately by preventing the separation of the seal unit and the assembly before assembling, and simultaneously press-fitting the seal plate and slinger into the outer member and the inner ring while maintaining a predetermined level. be able to.

  The wheel bearing device according to the present invention includes an outer member in which a double row outer rolling surface is integrally formed on an inner periphery, and a double row inner rolling that faces the outer rolling surface of the double row on an outer periphery. An inner member having a surface formed thereon, a double row rolling element housed between the rolling surfaces of the inner member and the outer member via a cage, and the outer member; A wheel bearing device including a seal mounted in an opening of an annular space formed between the inner member and a slinger and an annular seal in which at least one of the seals is disposed to face each other. And the slinger has a cylindrical portion that is press-fitted into the inner member, and a standing plate portion that extends radially outward from the cylindrical portion, and the seal plate is formed of the outer member. A metal core that is press-fitted into the inner circumference of the end, and this metal core are joined together by vulcanization and tilted outward in the radial direction. A side lip that is slidably contacted with a standing plate portion of the slinger via a predetermined axial shimiro, and a slanting inwardly extending in the radial direction, and a cylindrical portion of the slinger via a predetermined radial shimushiro And a seal member having a grease lip that is slidably contacted, and a backup seal is mounted on the outer side of the bearing of the seal, and the backup seal is press-fitted into the inner periphery of the end of the outer member. A core member, and a seal member integrally bonded to the core member by vulcanization and having a seal lip extending inward in the radial direction, and the seal lip has a predetermined shaft on the standing plate portion of the slinger Since it is slidably contacted through the direction shimoshiro, it prevents rainwater and dust from entering the seal directly, and the backup seal does not protrude from the outer member. Since it is mounted on the inner periphery, it will not be damaged by the impact of scattered objects, etc., and it will not interfere with other parts during transportation or assembly, so the original sealing performance can be demonstrated. Furthermore, it is possible to provide a wheel bearing device in which the airtightness of the fitting portion of the seal is improved and the sealing performance of the seal is improved.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels 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 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows the seal part of the conventional wheel bearing apparatus.

  A body mounting flange for mounting to the suspension device on the outer periphery is integrated, an outer member with a double row outer raceway formed on the inner periphery, and a wheel mounting flange for mounting a wheel on one end A hub wheel having an outer periphery and one inner rolling surface facing the outer rolling surface of the double row, and a small-diameter step portion extending in an 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 the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and both rolling of the inner member and the outer member. A double-row rolling element accommodated between the running surfaces via a cage, and a seal attached to an opening in an annular space formed between the outer member and the inner member. In the wheel bearing device provided, at least one of the seals is opposed to each other. The slinger has a cylindrical portion that is press-fitted into the inner ring, and a standing plate portion that extends radially outward from the cylindrical portion. A metal core press-fitted into the inner periphery of the end of the outer member, and a single metal piece bonded to the metal core by vulcanization bonding, extending radially outward, and extending in a predetermined axial direction on the standing plate portion of the slinger A pair of side lips slidably in contact with each other through a shimishi, and a seal member having a grease lip extending inwardly in the radial direction and in sliding contact with the cylindrical portion of the slinger through a predetermined radial shimeshilo In addition, a backup seal is mounted on the bearing outer side of the seal, and this backup seal is press-fitted into the inner periphery of the end of the outer member and is in contact with the opening end of the seal plate of the seal The mandrel, and this The seal lip is integrally bonded to gold by vulcanization and has a seal lip extending inwardly in the radial direction, and the seal lip is slid on the vertical plate portion of the slinger via a predetermined axial shimiro. It is touched.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, and FIG. 2 is an enlarged view of a main part showing a seal portion of FIG. 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.

  Here, the seal 9 on the inner side of the seals 8 and 9 is constituted by a so-called pack seal composed of a slinger 11 and an annular seal plate 12 arranged to face each other as shown in an enlarged view in FIG. Yes. The slinger 11 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). Etc.) and a cylindrical portion 11a which is formed in an annular shape as a whole in a substantially L-shaped section by press working, and which is press-fitted into the inner ring 3, and a standing plate portion 11b extending radially outward from the cylindrical portion 11a Consists of. Thereby, the rusting of the slinger 11 can be prevented and the durability of the seal 9 can be improved.

  On the other hand, the seal plate 12 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 12 includes a metal core 14 and a seal member 15 vulcanized and bonded to the metal core 14. The core 14 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). 10 includes a cylindrical portion 14a fitted inside the end portion 10 and a standing plate portion 14b extending radially inward from the cylindrical portion 14a.

  The seal member 15 is made of a synthetic rubber such as NBR (acrylonitrile-butadiene rubber), and has a pair of side lips 15a and 15b extending obliquely outward in the radial direction, and a grease extending obliquely in a bifurcated manner on the inner diameter side. It has a slip 15c and a dust lip 15d. The side lips 15a and 15b are in sliding contact with the side surface on the outer side of the standing plate portion 11b of the slinger 11 via a predetermined axial shimiro, and the grease lip 15c and the dust lip 15d respectively apply a radial shimiro to the cylindrical portion 11a. Are in sliding contact with each other. In addition to NBR, the material of the seal member 15 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 (polyacrylic rubber), FKM (fluororubber), and silicon rubber, which are excellent in properties.

  Further, the end of the cylindrical portion 14a of the cored bar 14a is formed thinner than the other portions and has a reduced diameter. And the opening end part 16 of the sealing member 15 goes around and is fixed to the outer surface of the end part of the cylindrical part 14a. Thereby, the adhering force of the seal member 15 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 this embodiment, the backup seal 17 is attached to the inner side of the seal 9. This backup seal 17 has a cylindrical cored bar 18 that is press-fitted into the inner periphery of the end of the outer member 10 on the outer diameter side so as to overlap the seal plate 12 of the seal 9, and vulcanized adhesion to the cored bar 18. And a sealing member 19 joined together.

  The core 18 is made of austenitic stainless steel plate (JIS standard SUS304 type, etc.) or rust-proof cold rolled steel plate (JIS standard SPCC type, etc.) by press working, and the other end. It is formed thinner and has a reduced diameter. A seal member 19 is wrapped around and fixed to the outer surface of the end portion of the cored bar 18.

  On the other hand, the seal member 19 is made of a synthetic rubber such as NBR, has a side lip 19a extending inwardly in the radial direction, and has a predetermined axial shimiro on the inner side surface of the standing plate portion 11b of the slinger 11. Are in sliding contact with each other. This prevents rainwater, dust, etc. from entering the seal 9 directly, and the backup seal 17 is mounted on the inner periphery of the end without protruding from the outer member 10. In addition, since it does not interfere with other parts during transportation or assembly, the inherent sealing performance of the seal can be exerted, and further, the airtightness of the fitting portion of the seal 9 is enhanced, and the seal 9 It is possible to provide a wheel bearing device with improved sealing performance.

  In this type of third generation structure, the inner ring 3 is press-fitted and fixed to the hub ring 2, and the inner ring 3 is immovable after assembly. The seal 9 can be easily and accurately assembled by press-fitting the seal plate 12 and the slinger 11 into the outer member 10 and the inner ring 3 at the same time while maintaining the squeeze.

  In addition, although the wheel bearing apparatus comprised by the double row angular contact ball bearing which used the ball for the rolling element 7 was illustrated here, this invention is not limited to this, The double row using the tapered roller for the rolling element 7 You may be comprised with the tapered roller bearing. Furthermore, it is not limited to the illustrated third generation structure, but may be a first, second generation structure, or a fourth generation structure.

  FIG. 3 is an enlarged view showing a main part of a second embodiment of the wheel bearing device according to the present invention. Note that the same parts and parts as those in the above-described embodiment or parts and parts having the same functions are denoted by the same reference numerals, and detailed description thereof is omitted.

  The inner-side seal 20 is constituted by a pack seal composed of a slinger 11 and an annular seal plate 21 that are arranged to face each other. The seal plate 21 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 21 includes a metal core 14 and a seal member 22 vulcanized and bonded to the metal core 14.

  The seal member 22 is made of a synthetic rubber such as NBR, and has a pair of side lips 22a and 22b extending obliquely outward in the radial direction, and a grease lip 22c extending inclined toward the bearing inward side on the inner diameter side. is doing. The side lips 22a and 22b are in sliding contact with the outer side surface of the standing plate portion 11b of the slinger 11 via a predetermined axial shimiro, and the grease lip 22c is in sliding contact with the cylindrical portion 11a via a predetermined radial shimillo. Yes. Thereby, the sliding contact torque of the seal 20 can be suppressed while maintaining the sealing performance.

  The thickness of the side lip 15a on the radially outer side of the pair of side lips is set to be thicker than the thickness of the side lip 15b on the radially inner side. Thereby, the contact load of the side lip 15a on the radially outer side becomes larger than the contact load of the side lip 15b on the radially inner side, and the muddy water resistance of the seal 9 can be improved.

  Further, the end of the cylindrical portion 14a of the cored bar 14a is formed thinner than the other portions and has a reduced diameter. And the opening end part 23 of the sealing member 22 goes around and is fixed to the outer surface of the end part of the cylindrical part 14a. Thereby, the adhering force of the seal member 22 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 this embodiment, the backup seal 24 is attached to the inner side of the seal 20. The backup seal 24 is press-fitted into the inner periphery of the end portion of the outer member 10 ′, and is integrated with a cylindrical metal core 25 that comes into contact with the open end 23 of the seal 20, and the metal core 25 by vulcanization adhesion or the like. And a seal member 26 joined to the head.

  The core metal 25 has other end portions 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). It is formed thinner and has a reduced diameter. A sealing member 26 is wrapped around and fixed to the outer surface of the end portion of the metal core 25.

  On the other hand, the seal member 26 is made of a synthetic rubber such as NBR, has a side lip 26a that extends inwardly in the radial direction, and has a predetermined axial shimiro on the inner side surface of the standing plate portion 11b of the slinger 11. Are in sliding contact with each other. This prevents rainwater, dust, etc. from entering the seal 20 directly, and the backup seal 24 is mounted on the inner periphery of the end without protruding from the outer member 10. In addition, since it does not interfere with other parts at the time of transportation or assembly, the inherent sealing performance of the seal can be exerted, and further, the airtightness of the fitting portion of the seal 20 is enhanced, and the seal 20 The sealing performance can be improved.

  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 can be applied to first to fourth generation wheel bearing devices having a pack seal.

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 4a Base part of the inner side of a wheel mounting flange 5 Hub bolt 6 Cage 7 Rolling element 8 Outer side seal 9, 20 Inner side seal 10, 10 'Outer member 10a Outer rolling surface 10b Car body mounting flange 11 Slinger 11a, 14a Cylindrical portion 11b, 14b Standing plate portion 12, 21 Seal plates 14, 18, 25 Cores 15, 19, 22, 26 Seal member 15a, 15b, 19a, 22a, 22b, 26a Side lip 15c, 22c Grease lip 15d Dustrip 16, 23 Seal member open end 17, 24 Backup seal 50 Seal 51 Outer member 52 Inner ring 53 Slinger 53a, 59c Cylindrical portion 53b Standing plate portion 53c Surface exposed portion 54 Seal 55, 59 core metal 56 and 60 seal member 56a, 56b the side lip 56c radial lip 57 magnetic encoder 58 backup seal 59a engaging portion 59b disc portion 59d in the end portion 60a sealing lip

Claims (9)

An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed on the outer periphery;
A double row rolling element housed between the rolling surfaces of the inner member and the outer member so as to be freely rollable via a cage;
In a wheel bearing device comprising a seal mounted in an opening of an annular space formed between the outer member and the inner member,
At least one of the seals is composed of a slinger and an annular seal plate arranged to face each other,
The slinger has a cylindrical portion that is press-fitted into the inner member, and a standing plate portion that extends radially outward from the cylindrical portion, and the seal plate is press-fitted into the inner periphery of the end of the outer member. And a side lip that is integrally joined to the core by vulcanization bonding, extends radially outwardly, and is slidably contacted with the standing plate portion of the slinger via a predetermined axial shimeoshiro, And a seal member having a grease lip that extends inwardly in a radial direction and is in sliding contact with a cylindrical portion of the slinger via a predetermined radial shimeoshiro,
A backup seal is mounted on the bearing outer side of the seal, and this backup seal is integrally joined to the core metal by vulcanization adhesion and a cylindrical metal core that is press-fitted into the inner periphery of the end of the outer member. A wheel comprising a seal member having a seal lip extending inwardly in the radial direction, wherein the seal lip is slidably contacted with a vertical plate portion of the slinger via a predetermined axial squeeze Bearing device.   The wheel bearing device according to claim 1, wherein the backup seal is mounted on an outer diameter side of the seal plate so as to overlap the seal plate of the seal.   The wheel bearing device according to claim 1, wherein the backup seal is in contact with an opening end portion of a seal plate of the seal.   The wheel bearing device according to claim 1, wherein the seal has a pair of side lips.   The seal is arranged so that the grease lip does not fall off from the cylindrical portion of the slinger even when the slinger moves due to the reaction force of the contact load of the pair of side lips in a single state. The wheel bearing device described.   The wheel bearing according to claim 4 or 5, wherein a thickness of a side lip on a radially outer side of the pair of side lips is set to be thicker than a thickness of a side lip on a radially inner side. apparatus.   2. The wheel according to claim 1, wherein an end portion of the cylindrical portion of the core metal of the seal is formed to be thinner and reduced in diameter than other portions, and the seal member is wound around and fixed to the outer surface of the end portion. Bearing device.   2. The wheel bearing device according to claim 1, wherein an end portion of the metal core of the backup seal is formed with a diameter reduced to be thinner than other portions, and the seal member wraps around and is fixed to an outer surface of the end portion. .   From the inner rolling surface, the inner member integrally has a wheel mounting flange for mounting a wheel at one end, and is opposed to one of the outer rolling surfaces of the double row on the outer periphery. A hub ring formed with a small-diameter step portion extending in the axial direction, and an inner rolling surface that is fitted into the small-diameter step portion of the hub wheel and that faces the other of the outer rolling surfaces of the double row are formed on the outer periphery. The wheel bearing device according to claim 1, comprising an inner ring, wherein the slinger is press-fitted into an outer diameter of the inner ring.

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