JP4697792B2 - Wheel bearing device - Google Patents

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like, and more particularly to a wheel bearing device with improved sealing performance.

  2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like is such that a hub wheel for mounting a wheel is rotatably supported via a rolling bearing, and there are 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. As the wheel bearing device, a double-row angular ball bearing having a desired bearing rigidity, exhibiting durability against misalignment, and having a small rotational torque from the viewpoint of improving fuel efficiency is often used. On the other hand, double row tapered roller bearings are used in vehicles such as off-road cars and trucks that have a heavy vehicle body weight.

  Since these wheel bearing devices are arranged at sites where muddy water or the like is likely to be applied, a seal device is mounted, and the space between the outer member and the inner member is sealed. Generally, in a sealing device, a sealing member having a sealing lip is attached to an outer member serving as a stationary member, and the sealing lip is slidably contacted with an outer peripheral surface of the inner member. In particular, in a vehicle that is driven in a poor environment such as an off-road car or a pickup truck, various means for further improving the sealing performance are taken.

  An example of such a wheel bearing device is shown in FIG. The wheel bearing device includes a knuckle 51 fixed to a chassis, an axle 52 extending through the knuckle 51, and fitted around the axle 52, and fastened to a wheel (not shown) via bolts 53. A hub wheel 54, a wheel bearing 55 that is fixed to the knuckle 51 and rotatably supports the hub wheel 54 and the axle 52, and a clutch 56 that is controlled by air pressure to engage and disengage the axle 52 and the hub wheel 54. It has.

  An annular chamber (vacuum chamber) 57 is formed between the knuckle 51 and the axle 52 and communicates with a clutch 56 provided in a sealed chamber 58 on the outer side. Here, when the annular chamber 57 is lower than the atmospheric pressure, the clutch 56 receives a negative pressure and is engaged, but when the annular chamber 57 is at the atmospheric pressure, the clutch 56 is disengaged. The annular chamber 57 communicates with a vacuum pump (not shown) through a vacuum passage 59 extending obliquely through the knuckle 51.

  The wheel bearing 55 is integrally provided with a vehicle body mounting flange 60b to be attached to the knuckle 51 on the outer periphery, and an outer member 60 in which tapered double-row outer rolling surfaces 60a and 60a are formed on the inner periphery. , Inner rings 61 and 62 each having tapered inner rolling surfaces 61a and 62a facing the outer circumferential surfaces of the double row outer rolling surfaces 60a and 60a, respectively, and the double row cones accommodated between the rolling surfaces. It consists of a double row tapered roller bearing provided with rollers 63, 63 and cages 64, 64 for holding these double rows of tapered rollers 63, 63 in a rollable manner.

  The hub wheel 54 integrally has a wheel mounting flange 65 for mounting a wheel (not shown) at one end, and a cylindrical small-diameter stepped portion 54a extending in the axial direction from the wheel mounting flange 65 is formed on the outer periphery. Yes. The wheel bearing 55 is press-fitted into the small diameter step portion 54 a of the hub wheel 54 and is fixed in the axial direction by a fixing nut 66. A sliding bearing 67 for allowing relative rotation is attached between the axle 52 and the hub wheel 54.

  Seals 68 and 69 are attached to both ends of the wheel bearing 55 to seal the opening of the annular space formed between the outer member 60 and the inner rings 61 and 62, and from the annular chamber 57 and the surrounding environment. Isolated. The seal 68 includes an outer case 70 press-fitted into the outer member 60 and an inner case 71 press-fitted into the inner ring 61. Seal lips 70 a and 71 a are integrally joined to the inner edge of the outer case 70 and the outer edge of the inner case 71, respectively, and are in sliding contact with the inner case 71 and the outer case 70. These seal lips 70 a and 71 a are configured to bend in the presence of a differential pressure between the inside of the wheel bearing 55 and the annular chamber 57 and discharge the inside of the wheel bearing 55 to the annular chamber 57. Therefore, the inside of the wheel bearing 55 receives substantially the same pressure as the annular chamber 57 when the annular chamber 57 is exhausted.

On the other hand, the seal 69 includes an outer case 72 press-fitted into the outer member 60 and an inner case 73 press-fitted into the inner ring 62 as shown in an enlarged view in FIG. A seal lip 72 a slidably contacting the inner case 73 and a side lip 72 b slidably contacting the side surface of the wheel mounting flange 65 are integrally joined to the end portion of the outer case 72. Further, a seal lip 73 a that is in sliding contact with the outer case 72 is integrally joined to the outer edge of the inner case 73. The seal 69 supports a pressure difference so that the inside of the wheel bearing 55 is maintained at a reduced pressure, and further prevents rainwater, dust, and the like from entering the bearing.
Special table 2001-510534 gazette

  In such a conventional wheel bearing device, in particular, in the seal 69 on the hub wheel 54 side, in addition to the seal lips 72a and 73a slidably contacted with the outer case 72 and the inner case 73, which are opposed to each other, the wheel mounting flange 65 is provided. Since the side lip 72b slidably contacted with the side surface is joined to the outer edge of the outer case 72, a strong sealing performance can be obtained. However, since the side lip 72b is in direct sliding contact with the wheel mounting flange 65, the seal sliding contact surface must be finished to a predetermined surface roughness, which not only increases the number of processing steps but also increases the cost. Since the ring 54 is made of carbon steel, rust is easily generated. Therefore, there is a possibility that the seal slidable contact surface may deteriorate, and in the configuration in which the side lip 72b is in direct slidable contact with the wheel mounting flange 65, the side lip 72b is worn and the stable sealing performance is maintained over a long period of time. difficult.

  This invention is made | formed in view of such a situation, and aims at the improvement of the sealing performance of a seal | sticker, and it aims at providing the wheel bearing apparatus which can maintain bearing performance over a long period of time. .

In order to achieve such an object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to the suspension on the outer periphery, and a double row outer rolling surface is formed on the inner periphery. The outer member and a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and a small-diameter stepped portion formed on the outer periphery, and an inner ring or a constant velocity universal joint fitted to the hub wheel 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, and both rolling surfaces of the inner member and the outer member For a wheel provided with a double row rolling element accommodated in a rollable manner via a cage, and a seal attached to an opening of an annular space formed by the outer member and the inner member In the bearing device, on the outer periphery of the outer end of the outer member, the bearing space is sealed. The Lumpur the mounted bar click up seal separate, the backup seal, the metal core and, bonded by vulcanization integrally to the metal core, and has been the base secured to the outer edge of the metal core, radially from the base portion extend inclined outwardly, formed of a sealing member distal end portion is composed of the side lip which is formed in a trumpet shape whose diameter increases Rutotomoni, metal ring of the side lip is in sliding contact with the disk-shaped said wheel mounting flange The metal ring is formed from a steel plate having a rust preventive ability.

As described above, an outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, a double row outer rolling surface formed on the inner periphery, and a wheel for attaching the wheel to one end. Consists of a hub ring that has an integrated mounting flange and has a small-diameter step on the outer periphery, and an outer joint member of an inner ring or a constant velocity universal joint that is fitted to the hub ring. An inner member in which a double row inner rolling surface facing the surface is formed, and a double row of the inner member and the outer member that are accommodated so as to be able to roll through a retainer between the rolling surfaces of the inner member and the outer member. In a wheel bearing device including a rolling element and a seal mounted on an opening of an annular space formed by an outer member and an inner member, a bearing space is provided on the outer periphery of the outer side end of the outer member. Ba click up seal is separate from the seal for sealing is mounted, the backup sheet A base metal, a base part that is integrally vulcanized and bonded to the core metal, and fixed to the outer edge of the core metal, and a trumpet in which the tip part expands in diameter from the base part and extends radially outward. Rutotomoni consists of a seal member comprising a side lip formed on Jo, the side lip in sliding contact disc-shaped metal ring is mounted on the side surface of the inner side of the wheel mounting flange, the metal ring is a Bosabino Since it is made of steel plate, it prevents rainwater and dust from directly entering the seal, and also prevents muddy water from staying at the base of the wheel mounting flange and causing rusting to reduce the durability. be able to. Therefore, even when used in a poor environment, it is possible to provide a wheel bearing device that can improve the sealing performance of the seal and maintain the bearing performance over a long period of time.

Moreover, like the invention of Claim 2, the said metal ring may be fixed in the state closely_contact | adhered along the flat part of the side surface by the side of the inner side of the said wheel mounting flange.

Further, as in the third aspect of the present invention, when the metal ring is finished with a predetermined surface hardness and surface roughness, a good seal sliding contact surface can be obtained simply by being mounted on the wheel mounting flange. In addition, the wear of the metal ring and the slidable contact surface of the lip can be suppressed, and the sealing performance can be maintained over a long period of time.

Moreover, if the elastic member is interposed between the said metal ring and the wheel attachment flange like invention of Claim 4 , adhesiveness with the side surface of a wheel attachment flange can be improved.

A wheel bearing device according to the present invention has a vehicle body mounting flange integrally attached to a suspension device on an outer periphery, an outer member having a double row outer rolling surface formed on an inner periphery, and one end portion. It consists of a hub wheel that has a wheel mounting flange for mounting the wheel and has a small diameter step on the outer periphery, and an outer joint member of the inner ring or constant velocity universal joint that is fitted to this hub wheel. An inner member in which a double row inner rolling surface facing the outer row rolling surface of the double row is formed, and rolling between the both rolling surfaces of the inner member and the outer member via a cage. In a wheel bearing device comprising a double row rolling element accommodated freely and a seal attached to an opening of an annular space formed by the outer member and the inner member, the outer circumference of the end portion of the outer side, the said seal for sealing the bearing space of the separate bus Kkua' Seal is mounted, the backup seal, a core metal, bonded by vulcanization integrally to the metal core, and has been the base secured to the outer edge of the metal core extends inclined from the base radially outward, consists of a seal member distal portion comprising a side lip formed in a trumpet shape whose diameter increases Rutotomoni, the side lip disc-shaped metal ring in sliding contact is mounted on the side surface of the inner side of the wheel mounting flange In addition, since the metal ring is formed from a steel plate having anti-corrosive ability, it prevents rainwater and dust from directly entering the seal, and muddy water stays at the base of the wheel mounting flange and rusts. It can suppress that durable strength falls. Therefore, even when used in a poor environment, it is possible to provide a wheel bearing device that can improve the sealing performance of the seal and maintain the bearing performance over a long period of time.

A hub wheel having a wheel mounting flange for mounting a wheel at one end and a small diameter step portion extending in the axial direction from the wheel mounting flange is formed on the outer periphery, and the hub wheel is press-fitted into the small diameter step portion of the hub wheel. An outer member comprising a wheel bearing, the wheel bearing integrally including a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and a double row outer rolling surface formed on the inner periphery; A pair of inner races formed on the outer periphery with an inner raceway facing the outer raceway of the double row, and a double row rolling element housed between the raceways via a cage between the raceways. A seal mounted in an opening of an annular space formed by the outer member and the inner ring, and a shaft formed by a crimping portion formed by plastically deforming an end portion of the small diameter step portion radially outward. In the wheel bearing device fixed in the direction, the outer side of the outer member The end periphery, and the seal for sealing the bearing space separately, extends inclined radially outwards, the backup seal mounted with a side lip formed like a horn tip portion is expanded in diameter together In addition, a disk-shaped metal ring with which the side lip is slidably contacted is fastened to a side surface on the inner side of the wheel mounting flange via a fixing bolt, and the metal ring is formed by pressing from a steel plate having anti-corrosive ability. Has been.

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, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 is a side view of a hub wheel alone. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

  This wheel bearing device is for a drive wheel called a second generation, and is composed of a hub wheel 1 and a wheel bearing 2, and the wheel bearing 2 is composed of an outer member 3, a double row rolling element ( A pair of inner rings 5 and 5 that are fitted through tapered rollers 4 and 4.

  The hub wheel 1 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at one end portion, and a small-diameter step portion 1a extending in the axial direction from the wheel mounting flange 6 is formed. A serration (or spline) 1b for transmission is formed. Hub bolts 6a are planted on the wheel mounting flange 6 at equal intervals in the circumferential direction. The wheel bearing 2 is press-fitted into the small-diameter step portion 1a of the hub wheel 1 via a predetermined shimiro, and the hub wheel is formed by a caulking portion 1c formed by plastically deforming an end portion of the small-diameter step portion 1a radially outward. 1 is fixed in the axial direction.

  The hub wheel 1 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon, such as S53C, and has a small diameter step from a base 6b formed in an arc shape on the inner side of the wheel mounting flange 6 via a shoulder 1d. The surface hardness is hardened in the range of 58 to 64 HRC by induction hardening over the part 1a. Thereby, it has sufficient mechanical strength with respect to the rotational bending load applied to the wheel mounting flange 6, and the fretting resistance of the small-diameter step portion 1 a serving as the fitting portion of the inner rings 5, 5 is improved.

  The outer member 3 of the wheel bearing 2 has a vehicle body mounting flange 3b integrally attached to a knuckle (not shown) on the outer periphery, and the outer side of the tapered double row that opens outward on the inner periphery. The rolling surfaces 3a and 3a are integrally formed. This outer member 3 is formed of medium carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and the double row outer rolling surfaces 3a and 3a have a surface hardness in the range of 58 to 64HRC by induction hardening. Has been cured.

  On the other hand, on the outer periphery of the inner ring 5, the tapered inner rolling surface 5a facing the double row outer rolling surfaces 3a, 3a and the rolling element 4 are guided to the larger diameter side of the inner rolling surface 5a. A large collar 5b and a small collar 5c for preventing the rolling element 4 from falling off are formed on the small diameter side. The inner ring 5 is made of high carbon chrome steel such as SUJ2, and is hardened in the range of 58 to 64 HRC up to the core part by quenching. And the double-row rolling elements 4 and 4 are accommodated between both rolling surfaces of the outer member 3 and a pair of inner ring | wheels 5 and 5, and are hold | maintained by the holder | retainers 7 and 7 so that rolling is possible. The wheel bearing 2 is a so-called back-to-back type double row tapered roller bearing that abuts against the shoulder 1d of the hub wheel 1 and the small collars 5c of the inner ring 5 abut each other in a butted state.

  Further, seals 8 and 8 are attached to an opening of an annular space formed between the outer member 3 and the inner ring 5. These seals 8 and 8 prevent the grease sealed inside the bearing from leaking to the outside and preventing rainwater, dust, etc. from entering the bearing from the outside. As shown in FIG. 2 in an enlarged manner, the seal 8 constitutes a so-called pack seal comprising an annular seal plate 9 and a slinger 10 which are substantially L-shaped in cross section and arranged to face each other. The seal plate 9 includes a metal core 11 that is press-fitted into the inner periphery of the end of the outer member 3, and a seal member 12 that is integrally vulcanized and bonded to the metal core 11. The core 11 has a substantially L-shaped cross section 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). Is formed.

  On the other hand, the slinger 10 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). The cylindrical portion 10a is press-fitted into the large collar 5b of the inner ring 5, and the upright plate portion 10b extends radially outward from the cylindrical portion 10a. A pair of side lips 12a and 12b formed integrally with the seal member 12 are in sliding contact with the standing plate portion 10b of the slinger 10, and a radial lip 12c is in sliding contact with the cylindrical portion 10a.

  Furthermore, in this embodiment, the backup seal 13 is press-fitted into the outer periphery of the end portion of the outer member 3. The backup seal 13 includes a metal core 14 and a seal member 15 that is integrally vulcanized and bonded to the metal core 14. The core 14 has a substantially L-shaped cross section by pressing from an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). Is formed. On the other hand, the seal member 15 includes a base portion 15a fixed to the outer edge of the core metal 14, and a side lip 15b formed in a trumpet shape that extends from the base portion 15a so as to incline radially outward and whose tip portion expands in diameter. Consists of. The side lip 15b is slidably contacted with a metal ring 16 mounted on the inner side surface 6c of the wheel mounting flange 6 to prevent rainwater, dust, and the like from directly entering the seal 8. Therefore, muddy water or the like stays in the narrow annular space between the hub wheel 1 and the wheel bearing 2, and the base 6b of the wheel mounting flange 6 can be prevented from rusting and the durability strength being lowered.

  Here, the metal ring 16 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 fixing bolt 17 is fastened to the wheel mounting flange 6. The metal ring 16 is preferably fastened through a packing (not shown) in order to improve the adhesion with the side surface 6c of the wheel mounting flange 6.

  As shown in FIG. 3, the metal ring 16 is formed in a disk shape, and has fixing portions 16 a that are formed at a plurality of locations in the circumferential direction (here, three locations) that are wide. Further, the metal ring 16 is finished to have a predetermined surface hardness and surface roughness, and a good seal sliding contact surface can be obtained simply by fastening the fixing portion 16 a to the wheel mounting flange 6. Therefore, unlike the prior art, there is no need to separately cut the inner side surface of the wheel mounting flange that becomes the sliding contact portion of the side lip and finish it to a predetermined surface roughness. Thereby, even if it uses in a poor environment, the sealing performance of the seal | sticker 8 can be improved and the wheel bearing apparatus which can maintain bearing performance over a long period of time can be provided. In addition, although the 2nd generation structure by the side of a drive wheel was illustrated here, the wheel bearing apparatus which concerns on this invention should just have the vehicle body attachment flange 3b in the outer periphery of the outer member 3 not only in this. A third or fourth generation structure may be used. Moreover, the driven wheel side may be sufficient. Furthermore, in this embodiment, the double row tapered roller bearing using the tapered roller as the rolling element 4 is exemplified, but it is needless to say that the double row angular contact ball bearing using a ball as the rolling element may be used.

  FIG. 4 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, and FIG. 5 is an enlarged view of part B of FIG. This embodiment is different from the above-described embodiment only in the configuration of the backup seal and the metal ring. In addition, the same components or parts having the same functions as those of the above-described embodiment are denoted by the same reference numerals and detailed description is given. Omitted.

  This wheel bearing device has a second generation structure comprising a hub wheel 18 and a double row rolling bearing 2. The hub wheel 18 integrally has a wheel mounting flange 6 ′ for mounting a wheel (not shown) at one end, and a small-diameter step portion 1a extending in the axial direction from the wheel mounting flange 6 ′ is formed on the outer periphery. Yes. The hub wheel 18 is formed of medium carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and has a high frequency from the inner side base portion 6b of the wheel mounting flange 6 ′ to the shoulder portion 1d and the small diameter step portion 1a. The surface hardness is hardened by quenching to a range of 58 to 64 HRC.

  In the present embodiment, a backup seal 19 is press-fitted to the outer periphery of the end portion of the outer member 3. As shown in an enlarged view in FIG. 5, the backup seal 19 includes a cored bar 14 and a seal member 20 that is integrally vulcanized and bonded to the cored bar 14. The seal member 20 includes a base portion 20a fixed to the outer edge of the core metal 14, and a radial lip 20b extending radially outward from the base portion 20a and having a tip end inclined toward the inner side. The radial lip 20b is in sliding contact with the metal ring 21 mounted on the inner side surface 6c of the wheel mounting flange 6 'to prevent rainwater, dust and the like from directly entering the seal 8.

  Here, the metal ring 21 is formed 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 fitted on the outer periphery of the wheel mounting flange 6 '. The metal ring 21 includes a circular plate portion 21a that is in close contact with the side surface 6c while avoiding the hub bolt 6a, and a cylindrical protruding portion that extends in the axial direction from the circular plate portion 21a and is in sliding contact with the radial lip 20b of the backup seal 19 described above. 21b. The metal ring 21 is preferably fitted via a packing (not shown) in order to improve the adhesion with the wheel mounting flange 6 '. Further, the metal ring 21 is finished to have a predetermined surface hardness and surface roughness, and a good seal sliding contact surface can be obtained simply by being fitted to the outer periphery of the wheel mounting flange 6 '. As a result, like the above-described embodiment, it is possible to provide a wheel bearing device capable of improving the sealing performance of the seal 8 and maintaining the bearing performance for a long period of time even when used in a poor environment. Can do.

  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, and various modifications can be made without departing from the scope of the present invention. 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 a wheel bearing device having a second to fourth generation structure regardless of whether it is for driving wheels or driven wheels.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is the A section enlarged view of FIG. It is a side view of the hub wheel single-piece | unit of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is the B section enlarged view of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. It is a principal part enlarged view of FIG.

Explanation of symbols

1, 18 ... hub wheel 1a ... small diameter step 1b ... ... Serration 1c ... Clamping part 1d ... Shoulder part 2 ... ... Wheel bearing 3 ... Outer member 3a ... Outward rolling Surface 3b ... Body mounting flange 4 ... Rolling element 5 ...・ ・ ・ ・ ・ ・ Inner ring 5a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 5b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Otsuchi 5c ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small 6, 6 ′ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Hub bolt 6b ... Base 6c ... Side 7 on the inner side ...・ ・ ・ ・ ・ Cage 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 10 ・ ・ ・······· Slinger 10a ·························································· ········· Core 12, 12, 20 ··········· Seal members 12a, 12b, 15b ··· Side lips 12c, 20b ··· ... Radial lips 13, 19 ... Backup seals 15a, 20a ... Base 16, 21 ... ... Metal ring 16a ... ···························································. ... Projection 51 ... Knuckle 52 ... Axle 53 ... ····························································· Hub Ring 54a・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel bearing 56 ・ ・ ・ ・ ・ ・ ・ ・ clutch 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Annular chamber 58 ・ ・ ・ ・ ・ ・ Sealed chamber 59 ・ ・ ・ ・ ・ ・ Vacuum passage 60 ・ ・ ・ ・ ・ ・... External member 60a ... External rolling surface 60b ... .... Body mounting flanges 61, 62 ... Inner rings 61a, 62a ... Inside rolling surface 63 ...・ ・ ・ ・ ・ ・ ・ ・ Taper roller 64 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cage 65 ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 66 ・ ・・ ・ ・ ・ ・ ・ ・ ・ Fixing nut 67 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slide bearing 68, 69 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 70 72 ... Outer case 70a, 71a, 72a, 73a ... Seal lip 71, 73 ... Inner case 72b ...・ ・ ・ ・ ・ ・ ・ ・ ・ Side lip

Claims (4)

An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and having a double row outer rolling surface formed on the inner periphery;
It consists of a hub wheel that has a wheel mounting flange for mounting a wheel at one end and a small-diameter step on the outer periphery, and an outer ring member of an inner ring or constant velocity universal joint that is fitted to this hub ring. An inner member in which a double row inner rolling surface facing the double row outer rolling surface 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 the wheel bearing device provided with a seal attached to an opening of the annular space formed by the outer member and the inner member,
The outer side of the outer circumference of the end portion of the outer member, and the seal for sealing the bearing space bar click up seal separate is mounted, the backup seal, a core metal, bonded by vulcanization integrally to the metal core the anchored base to the outer edge of the metal core extends inclined from the base radially outward, is constituted by a sealing member comprising a side lip tip is formed in a trumpet shape whose diameter increases Rutotomoni The wheel bearing is characterized in that a disk-shaped metal ring with which the side lip is in sliding contact is mounted on the inner side surface of the wheel mounting flange, and the metal ring is formed of a steel plate having anti-rust performance. apparatus. The wheel bearing device according to claim 1, wherein the metal ring is fixed in close contact with a flat portion on a side surface on the inner side of the wheel mounting flange. The wheel bearing device according to claim 1 or 2, wherein the metal ring is finished to have a predetermined surface hardness and surface roughness. The wheel bearing device according to any one of claims 1 to 3, wherein an elastic member is interposed between the metal ring and a wheel mounting flange.

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