JP2008032067A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for wheels enabling the bearing performance to be maintained for a long period by increasing the sealing performance of the seal. <P>SOLUTION: An outer seal 8 comprises an annular seal plate 9 having a core 11 formed in a generally L-shape in cross section and opposed to each other and press-fitted to the end part inner periphery of an outer member 3 and a seal member 12 joined to the core and a slinger 10 press-fitted to the outer periphery of an inner ring 5. The seal member 12 has side lips 12a, 12b in slidable contact with the slinger 10. A backup seal 13 is fitted to the outer side of the seal 8. The backup seal is formed of a core 14 press-fitted to the end part outer periphery of the outer member 3 and a seal member 15 integrally joined to the inner end part of the core. The seal member 15 extends aslant radially inward, and integrally has a seal lip 15a in slidable contact with the slinger 10. Since rainwater and dust are prevented from directly intruding into the seal 8, the sealing performance of the seal 8 is enhanced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like, and more particularly to a wheel bearing device that improves the sealing performance of a seal.

  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 mounted 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 inside of the bearing (see, for example, Patent Document 1). .)

  Furthermore, this patent document 1 discloses another seal 74. That is, the seal 74 in the case where the side lip 72b of the seal 69 does not have the side surface of the wheel mounting flange 65 in which the side lip 72b is slidably contacted, as shown in FIG. A case 75, a carrier 76 that is press-fitted into the inner ring 62, and an inner case 77 that is externally fitted to and integrated with the carrier 76 are provided. The carrier 76 protrudes from the outer case 75 in both the axial direction and the radial direction, and extends beyond the outer case 75 in the radial direction.

At the end of the outer case 75, a rib that forms a labyrinth seal between the seal lip 72a slidably contacting the inner case 77, the side lip 72b slidably contacting the side surface of the carrier 76, and the inner case 77 extending in the axial direction. 75a is integrally joined. Thus, the seal 74 prevents rainwater, dust and the like from entering the inside of the bearing by a labyrinth seal constituted by the side lip 72b slidably contacting the carrier 76, the outer case 75, the inner case 77, and the carrier 76. Yes.
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, there is a possibility that rust is generated on the sliding contact surface and deteriorates. If the slidable contact surface deteriorates, the side lip 72b wears, and it is difficult to maintain a stable sealing performance over a long period of time. Further, the seal 74 provided with the carrier 76 has a complicated structure, which makes it difficult to handle and assemble it into a bearing.

  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. A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end portion and a small-diameter step portion formed on the outer periphery, and an inner ring fitted to the small-diameter step portion of the hub ring or An inner member composed of an outer joint member of a constant velocity universal joint, and an inner member in which a double row inner rolling surface facing the double row outer rolling surface is formed on the outer periphery, and the inner member and the outer member. A double row rolling element accommodated between the rolling surfaces 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 wheel bearing device provided, the outer side seals are substantially L-shaped in cross section and are mutually connected. And an annular seal plate that is press-fitted into the outer periphery of the inner member and an annular seal plate that is press-fitted into the inner periphery of the end of the outer member, and a seal member that is integrally joined to the metal core. The seal member has a side lip that is in sliding contact with the slinger, and a backup seal is provided on the outer side of the seal, and the backup seal is connected to the outer member. A cylindrical fitting portion that is press-fitted into the outer periphery of the end portion, a disc portion that extends radially inward from the fitting portion and that is in close contact with the end portion of the outer member, and a diameter further from the disc portion. A seal lip which is formed by an inner end portion extending inward in a direction and a seal member integrally joined to the core metal, the seal member extending inward in the radial direction and slidingly contacting the slinger Has one There.

  Thus, in the wheel bearing device of the second to fourth generation structure provided with the seal mounted on the opening of the annular space formed by the outer member and the inner member, the outer seal has a cross section. Are formed in a substantially L-shape and opposed to each other, and are formed of a core bar press-fitted into the inner periphery of the end portion of the outer member, and an annular seal plate formed of a seal member integrally joined to the core bar, It is composed of a composite type seal consisting of a slinger pressed into the outer periphery of the member, the seal member has a side lip that is in sliding contact with the slinger, and a backup seal is provided on the outer side of the seal. A cylindrical fitting portion that is press-fitted into the outer periphery of the end portion of the outer member, a disc portion that extends radially inward from the fitting portion, and that is in close contact with the end portion of the outer member, and from this disc portion And an inner end extending radially inward, And a seal member integrally joined to the core, and the seal member extends inward in the radial direction and integrally has a seal lip that is in sliding contact with the slinger. A wheel bearing device that prevents direct entry of dust and dust into the seal, improves the sealing performance of the seal and maintains the bearing performance for a long period of time even when used in a poor environment. Can be provided.

  Further, as in the invention according to claim 2, if the seal member of the backup seal is joined to the disk portion from the inner side surface of the inner end portion of the cored bar, the backup seal is airtight. And the sealing performance of the outer side seal can be improved.

  According to a third aspect of the present invention, the seal member of the backup seal is joined from the outer surface of the inner end portion of the core bar to the end edge of the fitting portion, If the entire exposed part is covered, it is possible to use an inexpensive SPCC-based cold rolled steel plate without using an expensive stainless steel plate having anti-corrosive ability for the core metal, thereby reducing costs. be able to.

  According to a fourth aspect of the present invention, the seal member of the backup seal is formed in a trumpet shape that extends from the inner end portion of the core bar so as to incline radially outward and the tip portion expands in diameter. If this side lip is in sliding contact with the wheel mounting flange, it is possible to further improve the sealing performance of the outer side seal, and in the narrow annular space at the base of the wheel mounting flange. It can suppress that muddy water etc. remain and this base part rusts and intensity | strength and durability fall.

  Moreover, if the slinger is formed by press working from a steel plate having rust prevention ability as in the invention described in claim 5, it prevents rusting over a long period of time and maintains a stable sealing property. can do.

  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. From a hub ring integrally having a wheel mounting flange for mounting a wheel and having a small-diameter step portion formed on the outer periphery, and an outer joint member of an inner ring or a constant velocity universal joint fitted to the small-diameter step portion of the hub ring And an inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery, and a cage is provided between both rolling surfaces of the inner member and the outer member. In a wheel bearing device comprising: a double row of rolling elements housed so as to be freely rollable via; and a seal attached to an opening of an annular space formed by the outer member and the inner member. The outer side seals are arranged opposite each other with a substantially L-shaped cross section, A composite type consisting of a core bar press-fitted into the inner periphery of the end of the material, an annular seal plate composed of a seal member integrally joined to the core bar, and a slinger pressed into the outer periphery of the inner member The seal member has a side lip that is in sliding contact with the slinger, and a backup seal is provided on the outer side of the seal. The backup seal is press-fitted into the outer periphery of the end of the outer member. A cylindrical fitting portion, a disc portion extending radially inward from the fitting portion and closely contacting the end portion of the outer member, and an inner end portion extending further radially inward from the disc portion And a seal member integrally joined to the core, and the seal member extends inward in the radial direction and integrally includes a seal lip that is in sliding contact with the slinger. , Rainwater and dust To provide a wheel bearing device capable of preventing direct intrusion into a seal, improving the seal performance of the seal even when used in a poor environment, and maintaining the bearing performance over a long period of time. it can.

  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. And a seal attached to an opening of an annular space formed by the outer member and the inner ring, and the crimping portion formed by plastically deforming an end portion of the small diameter step portion radially outward. In the wheel bearing device in which the inner ring is fixed in the axial direction, the outer side An annular seal comprising a cored bar having a substantially L-shaped cross section and facing each other, press-fitted into the inner periphery of the end of the outer member, and a seal member integrally joined to the cored bar A composite seal composed of a plate and a slinger formed by press working from a steel plate having a rust-preventing ability and press-fitted into the outer periphery of the inner ring, and the seal member has a side lip that is in sliding contact with the slinger A backup seal is provided on the outer side of the seal, and the backup seal extends inward in the radial direction from the cylindrical fitting portion that is press-fitted into the outer periphery of the end portion of the outer member. A metal core composed of a disk portion closely contacting the end of the outer member, an inner end extending further radially inward from the disk portion, and a seal member integrally joined to the metal core This It extends inclined seal member is radially inward, integrally has a sliding contact seal lip with the slinger.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
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 the seal of FIG. 1, and FIG. 3 shows a modification of the seal of FIG. FIG. 4 is an enlarged view of an essential part, FIG. 4 is an enlarged view of an essential part showing another modification of FIG. 2, and FIG. 5 is an enlarged view of an essential part showing another seal. 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, and a cylindrical small-diameter step portion 1a extending in the axial direction from the wheel mounting flange 6 is formed on the outer periphery. A serration (or spline) 1b for torque transmission is formed on the inner periphery. 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 through a predetermined shimiro, and a predetermined portion is formed by a crimping portion 1c formed by plastically deforming an end portion of the small-diameter step portion 1a radially outward. It is fixed in the axial direction with respect to the hub wheel 1 with the bearing preload applied.

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

  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 and the rolling element 4 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. 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 constituted by a so-called back-to-back type double row tapered roller bearing that abuts against the shoulder 1d of the hub wheel 1 and that the small flanges 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 an enlarged view in FIG. 2, the seal 8 constitutes a so-called pack seal, which is a composite seal composed of an annular seal plate 9 and a slinger 10 having a substantially L-shaped cross section and arranged to face each other. is doing. 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 joined to the metal core 11 by vulcanization adhesion. The metal core 11 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).

  On the other hand, the slinger 10 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 10a is press-fitted into the large collar 5b, and the upright plate portion 10b extends radially outward from the cylindrical portion 10a. Thereby, the slinger 10 has rust prevention ability and can prevent rusting over a long period of time. The pair of side lips 12a and 12b are in sliding contact with the standing plate portion 10b of the slinger 10, and the radial lip 12c is in sliding contact with the cylindrical portion 10a.

  In the present embodiment, a backup seal 13 is further press-fitted to 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 is formed in a cup shape 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), A cylindrical fitting portion 14a that is press-fitted and fixed to the outer periphery of the outer side end portion of the outer member 3, and extends radially inward from the fitting portion 14a and is in close contact with the outer side end portion of the outer member 3 The disc part 14b to be formed and the inner end part 14c extending further radially inward from the disc part 14b.

  On the other hand, the seal member 15 is joined to the inner end portion 14c of the core metal 14, and has a side lip 15a extending inclining radially inward. The side lip 15a is in sliding contact with the outer surface of the standing plate portion 10b of the slinger 10 to prevent rainwater, dust, and the like from directly entering the seal 8. 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 may not be this but may be a driven wheel side, and 3rd or 4th generation structure It may be. Further, in the present 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 4 may be used. .

  FIG. 3 shows a modification in which the configuration of the backup seal 13 of FIG. 2 is partially different. Here, the same parts as those in the above-described embodiment or parts having the same functions are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the backup seal 16 attached to the outer end of the outer member 3 includes a cored bar 14 and a seal member 17 that is integrally vulcanized and bonded to the cored bar 14. The seal member 17 has a side lip 17a that is joined from the inner side surface of the inner end portion 14c of the cored bar 14 to the disk portion 14b, and extends while inclining radially inward. Thereby, the airtightness of the backup seal 16 becomes high, and the sealing performance of the seal 8 can be further improved.

  FIG. 4 shows a modification in which the configuration of the backup seal 13 of FIG. 2 is partially different. In the present embodiment, the backup seal 18 includes a cored bar 14 and a seal member 19 that is integrally vulcanized and bonded to the cored bar 14. The seal member 19 is joined from the outer surface of the inner end portion 14 c of the core bar 14 to the end edge of the fitting portion 14 a and covers the entire exposed portion of the core bar 14. Thereby, even if it does not use the expensive stainless steel plate which has rust prevention capability for the metal core 14, cold-rolled steel plates, such as an inexpensive SPCC system, can be used, and cost reduction can be achieved.

  FIG. 5 shows another embodiment of the backup seal 13 of FIG. In the present embodiment, the backup seal 20 attached to the outer end of the outer member 3 includes a cored bar 14 and a seal member 21 that is integrally vulcanized and bonded to the cored bar 14. The seal member 21 includes a side lip 21 a that is in direct sliding contact with the base portion 6 b of the wheel mounting flange 6 in addition to the side lip 15 a that is in sliding contact with the standing plate portion 10 b of the slinger 10. The side lip 21a extends in a radially outward direction from the inner end portion 14c of the core metal 14, and is formed in a trumpet shape in which the tip end portion has a larger diameter. As a result, the sealing performance of the seal 8 can be further improved, and muddy water or the like stays in a narrow annular space between the hub wheel 1 and the wheel bearing 2, and the base portion 6b of the wheel mounting flange 6 rusts. Thus, it is possible to suppress a decrease in strength and durability.

  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 in which a seal is attached to a bearing end portion, regardless of whether it is for a driving wheel or a driven wheel.

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 | sticker 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 other modification of the seal | sticker of FIG. It is a principal part enlarged view which shows another seal | sticker. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. (A) is a principal part enlarged view which shows the seal | sticker of FIG. (B) is a principal part enlarged view which shows another seal | sticker.

Explanation of symbols

1 ... hub wheel 1a ... small diameter step 1b ... ············ Serration 1c ·······················································・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel Bearing 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・.... Outer member 3a ... Outer rolling surface 3b ... .... Body mounting flange 4 ... Rolling element 5 ...・ Inner ring 5a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 5b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Otsuchi 5c ・...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... hub bolt 6b ... base 7 ...・ Retainer 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 10 ・... Slinger 10a ... ... Cylindrical part 10b ... ······································································· Core 12, 12, 17, 19, 21 Members 12a, 12b, 15a, 17a, 21a .... Side lip 12c ... ..Radial lip 13, 16, 18, 20 ... Backup seal 14a ... Fitting part 14b ... ············ disk portion 14c ················· Inner end portion 51 .... Knuckle 52 ... Axle 53 ...・ Bolt 54 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 54a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 55 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel bearing 56 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clutch 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Annular chamber 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ sealed chamber 59 ······································································· An outer member 60a・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 60b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flanges 61, 62 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rings 61a, 62a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・· Tapered roller 64 · · · · · · · · · · · · cage 65 · · · · · · · wheel mounting flange 66 ·・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut 67 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sliding bearing 68, 69, 74・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 70, 72, 75 ・ ・ ・ ・ ・ ・ ・ ・ Outer case 0a, 71a, 72a, 73a ... Seal lips 71, 73, 77 ... Inner case 72b ...・ ・ ・ ・ Side lip 75a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rib 76 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Carrier

Claims (5)

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;
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 fitted to the small-diameter stepped portion of the hub wheel or the outer side of the constant velocity universal joint An inner member formed of a joint member, and formed on the outer periphery with a double-row inner rolling surface facing the double-row outer rolling surface;
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 seal has a substantially L-shaped cross section and is arranged to face each other. The core bar is press-fitted into the inner periphery of the end of the outer member, and the seal member is integrally joined to the core bar. An annular seal plate and a slinger pressed into the outer periphery of the inner member. The seal member has a side lip that is in sliding contact with the slinger, and the outer side of the seal. The backup seal is provided with a cylindrical fitting portion that is press-fitted into the outer periphery of the end portion of the outer member, and extends radially inward from the fitting portion to end the outer member. And a seal member integrally joined to the mandrel, and the seal member having a diameter. Inclined inward , Wheel bearing apparatus characterized by integrally has a sliding contact seal lip with the slinger.   The wheel bearing device according to claim 1, wherein the seal member of the backup seal is joined to the disk portion from the inner surface of the inner end portion of the cored bar.   The seal member of the backup seal is joined over the edge of the fitting portion from the outer surface of the inner end portion of the metal core, and covers the entire exposed portion of the metal core. The wheel bearing device described.   A seal member of the backup seal integrally has a side lip formed in a trumpet shape extending in a radially outward direction from an inner end portion of the cored bar, and a tip end portion having a diameter increased. The wheel bearing device according to claim 1, wherein the wheel bearing device is in sliding contact with the wheel mounting flange.   The wheel bearing device according to any one of claims 1 to 4, wherein the slinger is formed by press working from a steel plate having rust prevention ability.

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