JP2009144792A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel capable of maintaining bearing performance over a long period, by improving sealability of a seal. <P>SOLUTION: A backup seal 13 is installed in an end part on the outer side of an outer member 3. The backup seal 13 is composed of cylindrical core metal 14 pressed in the end part outer periphery of the outer member 3 and a seal member 15 integrally vulcanized and adhered to the core metal 14. The seal member 15 has a side lip 15b slantingly extending outside in the radial direction, formed in a trumpet shape of diametrically expanding a tip part and slidingly contacted with a side surface 6c on the inner side of a wheel installing flange 6. Since a base part 15a of this side lip 15b is fixed so as to cover an end part on the inner side of the core metal 14, even if the wheel installing flange 6 and the outer member 3 are a closely adjacent structure, a space of the seal member 15 can be sufficiently secured, and the bearing device can be optimally designed to provide the side lip 15b with appropriate contact pressure. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

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.

  The present applicant has proposed such a wheel bearing device with improved sealing performance. As shown in FIG. 8, the wheel bearing device includes a hub wheel 51 and a wheel bearing 52, and the wheel bearing 52 includes an outer member 53 and double row tapered rollers 54 and 54. A pair of fitted inner rings 55 and 55 is provided.

  The hub wheel 51 integrally has a wheel mounting flange 56 for mounting a wheel (not shown) at one end portion, and a small-diameter step portion 51a extending in the axial direction from the wheel mounting flange 56 is formed, and torque is formed on the inner periphery. A serration (or spline) 51b for transmission is formed. Hub bolts 56a are planted on the wheel mounting flange 56 at equal intervals in the circumferential direction.

  The wheel bearing 52 is press-fitted into the small-diameter step portion 51a of the hub wheel 51 via a predetermined shimiro, and the hub wheel is formed by a caulking portion 51c formed by plastically deforming an end portion of the small-diameter step portion 51a radially outward. The shaft 51 is fixed in the axial direction.

  The outer member 53 of the wheel bearing 52 is integrally provided with a vehicle body mounting flange 53b to be attached to a knuckle (not shown) on the outer periphery, and the outer side of the tapered double row opened outward on the inner periphery. The rolling surfaces 53a and 53a are integrally formed.

  On the other hand, on the outer periphery of the inner ring 55, the tapered inner rolling surface 55a facing the double row outer rolling surfaces 53a, 53a and the tapered roller 54 are guided to the larger diameter side of the inner rolling surface 55a. A large collar 55b and a small collar 55c for preventing the tapered roller 54 from dropping off are formed on the small diameter side. The double-row tapered rollers 54 and 54 are accommodated between the rolling surfaces of the outer member 53 and the pair of inner rings 55 and 55, and are rotatably held by the cages 57 and 57. In addition, seals 58 and 58 are attached to an opening of an annular space formed between the outer member 53 and the inner ring 55. These seals 58 and 58 prevent the grease sealed inside the bearing from leaking to the outside and preventing rainwater and dust from entering the bearing from the outside.

  As shown in an enlarged view in FIG. 9, the seal 58 constitutes a so-called pack seal composed of an annular seal plate 59 and a slinger 60 which are substantially L-shaped in cross section and arranged to face each other. The seal plate 59 has a substantially L-shaped cross section, and includes a core metal 61 press-fitted into the inner periphery of the end of the outer member 53 and a seal member 62 integrally vulcanized and bonded to the core metal 61. .

  On the other hand, the slinger 60 has a substantially L-shaped cross section, and includes a cylindrical portion 60a that is press-fitted into the large collar 55b of the inner ring 55, and a standing plate portion 60b that extends radially outward from the cylindrical portion 60a. A pair of side lips 62a and 62b formed integrally with the seal member 62 are in sliding contact with the standing plate portion 60b of the slinger 60, and a radial lip 62c is in sliding contact with the cylindrical portion 60a.

  Further, a backup seal 63 is press-fitted into the outer periphery of the end portion of the outer member 53. The backup seal 63 includes a cored bar 64 having a substantially L-shaped cross section, and a seal member 65 integrally vulcanized and bonded to the cored bar 64. On the other hand, the seal member 65 includes a base portion 65a fixed to the outer edge of the cored bar 64, a side lip 65b formed in a trumpet shape that extends from the base portion 65a so as to incline outward in the radial direction, and the tip portion expands in diameter. Consists of.

The side lip 65b is slidably contacted with a metal ring 66 fixed to the inner side surface 56c of the wheel mounting flange 56 by a fixing bolt 67, and prevents rainwater, dust and the like from directly entering the seal 58. . Therefore, it can be suppressed that muddy water or the like stays in the narrow annular space between the hub wheel 51 and the wheel bearing 52 and the base portion 56b of the wheel mounting flange 56 rusts and the durability strength is lowered.
JP 2007-132454 A

  However, in such a conventional wheel bearing device, when the wheel mounting flange 56 and the end of the outer member 53 are close to each other, it is difficult to secure a sufficient space for the backup seal 63, and the side lip 65b I have to shorten the length. This makes it difficult to perform an optimum design with an appropriate contact pressure, and there is a risk that the sealing performance will be reduced due to fluctuations in the shimeshi due to lip wear.

  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 integrally on the inner periphery. A formed 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 speed fitted to the hub ring An inner member comprising an outer joint member of a universal joint and having a double-row inner rolling surface facing the double-row outer rolling surface on the outer periphery, and both 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 of an annular space formed by the outer member and the inner member. In the wheel bearing device, a backup seal is mounted on the outer end of the outer member. The backup seal is composed of a core metal having a cylindrical fitting portion press-fitted into the outer periphery of the end portion of the outer member, and a seal member integrally vulcanized and bonded to the core metal. The seal member has a side lip that extends in a radially outward direction and has a side lip that is formed in a trumpet shape in which a tip end portion is enlarged and is in sliding contact with an inner side surface of the wheel mounting flange. The base is fixed to the inner side end of the cored bar.

  As described above, in the wheel bearing device including the seal mounted on the opening of the annular space formed by the outer member and the inner member, the backup seal is mounted on the outer end of the outer member. The backup seal is composed of a metal core having a cylindrical fitting portion that is press-fitted into the outer periphery of the end of the outer member, and a seal member that is integrally vulcanized and bonded to the metal core. However, it has a side lip formed in a trumpet shape that extends in a radially outward direction and has a tip that expands in diameter, and is in sliding contact with the side surface on the inner side of the wheel mounting flange. Since it is fixed to the end portion on the inner side of the gold, even if the wheel mounting flange and the end portion of the outer member are close to each other, a sufficient space for the seal member can be secured, and the side lip Have appropriate contact pressure It is the optimal design. In other words, the side lip has an appropriate rigidity to prevent the seal from changing due to lip wear, and to improve the sealing performance, maintaining the bearing performance over a long period of time. A wheel bearing device that can be provided can be provided.

  Preferably, as in the invention described in claim 2, if the cored bar has a convex part bent radially outward from the inner side end of the fitting part, the cored bar This increases the rigidity of the back-up seal and improves the reliability of the back-up seal, while maintaining the contact pressure of the side lip and ensuring the desired sealing performance over a long period of time.

  Further, as in the invention described in claim 3, the cored bar has a flange portion that extends radially inward from an outer end portion of the fitting portion and is in close contact with the end surface of the outer member. If so, the rigidity of the core bar is further increased, the pull-out resistance of the backup seal is further increased and the reliability is improved, the contact area of the seal press-fitting jig is increased, and the press-fit property and the positioning accuracy are improved. .

  Preferably, as in the invention according to claim 4, the seal on the outer side of the seals is composed of an annular seal plate and a slinger arranged in opposition to each other with a substantially L-shaped cross section. If the inner diameter of the collar portion of the metal core is set to be smaller than the outer diameter of the slinger and a labyrinth seal is formed between the seal and the seal, even if muddy water or the like enters from the backup seal, the sealing performance of the seal is improved. Can be improved.

  Further, as in the fifth aspect of the invention, if the base portion of the side lip is fixed so as to cover the end portion on the inner side of the core metal, the surface of the core metal is not exposed to the outside. Further, since it can be changed from an expensive austenitic stainless steel plate to a relatively inexpensive cold rolled steel plate, the cost can be reduced.

  Further, as in the invention described in claim 6, a metal ring having a rust-proofing property is attached to the inner side surface of the wheel mounting flange, and the side lip of the backup seal is slidably contacted with the metal ring. If this is the case, even if muddy water stays in the narrow annular space between the hub wheel and the wheel bearing and the side surface of the wheel mounting flange rusts, rusting of the lip sliding contact surface can be prevented. Further, it is possible to prevent lip wear over a long period of time and improve the sealing performance.

  A wheel bearing device according to the present invention has an outer member integrally formed with a vehicle body mounting flange for mounting to a suspension device on the outer periphery, and an outer member formed integrally with a double row outer rolling surface on the inner periphery, and one end A hub ring integrally having a wheel mounting flange for mounting a wheel on the part, and a outer ring member of an inner ring or a constant velocity universal joint fitted to the hub ring, and a small-diameter stepped portion formed on the outer periphery, 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. A wheel bearing device comprising: a double row of rolling elements housed so as to be freely rollable; and a seal attached to an opening of an annular space formed by the outer member and the inner member. A backup seal is attached to the outer end of the member. Is comprised of a cored bar having a cylindrical fitting portion that is press-fitted into the outer periphery of the end of the outer member, and a seal member that is integrally vulcanized and bonded to the cored bar. The side lip has a side lip that extends in a radially outward direction and is formed in a trumpet shape whose tip is enlarged in diameter, and is in sliding contact with the inner side surface of the wheel mounting flange. Since it is fixed to the end portion on the inner side of the gold, even if the wheel mounting flange and the end portion of the outer member are close to each other, a sufficient space for the seal member can be secured, and the side lip Optimal design with appropriate contact pressure is possible. In other words, the side lip has an appropriate rigidity to prevent the seal from changing due to lip wear, and to improve the sealing performance, maintaining the bearing performance over a long period of time. A wheel bearing device that can be provided can be provided.

  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 having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and a double row outer rolling surface formed integrally on the inner periphery A pair of inner rings each having an inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a double row rolling accommodated between the rolling surfaces via a cage. A caulking portion that includes a moving body and a seal attached to an opening portion of an annular space formed by the outer member and the inner ring, and is formed by plastically deforming an end portion of the small-diameter step portion radially outward. In the wheel bearing device fixed in the axial direction by the outer member. A back-up seal is attached to the end of the outer side, and the back-up seal has a cylindrical fitting portion that is press-fitted into the outer periphery of the end of the outer member, and is vulcanized and bonded integrally to the core. The seal member is formed in a trumpet shape that extends in a radially outward direction and has a tip portion that expands in diameter, and is in sliding contact with the side surface on the inner side of the wheel mounting flange. A side lip is provided, and a base portion of the side lip is fixed so as to cover an end portion on the inner side of the cored bar.

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 main part of FIG. 1, and FIG. 3 is an enlarged main part of a modification of FIG. 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 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 and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and has a small diameter step from a base portion 6b formed in an arc shape on the inner side of the wheel mounting flange 6 through a shoulder portion 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 and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the double row outer rolling surfaces 3a and 3a have a surface hardness 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 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 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 an enlarged view in FIG. 2, the seal 8 constitutes a pack seal composed of 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 pressing from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). Is formed.

  On the other hand, the 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 formed into a shape and is press-fitted into the outer diameter of the inner ring 5, and the upright plate portion 10b extending 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 cylindrical metal core 14 and a seal member 15 that is integrally vulcanized and bonded to the metal core 14. The metal core 14 is formed into a cylindrical shape 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). Yes. On the other hand, the seal member 15 is formed in a trumpet shape in which a base portion 15a fixed to an inner end portion of the metal core 14 is inclined and extends radially outward from the base portion 15a, and a distal end portion is enlarged in diameter. It consists of a side lip 15b. The side lip 15b is in sliding contact with the inner side surface 6c of the wheel mounting flange 6 to prevent rainwater, dust and the like from directly entering the seal 8.

  In the present embodiment, by employing the backup seal 13 having such a configuration, a sufficient space for the seal member 15 is ensured even when the wheel mounting flange 6 and the end of the outer member 3 are close to each other. Therefore, an optimum design having an appropriate contact pressure of the side lip 15b can be achieved. In other words, the side lip 15b has an appropriate rigidity, and it is possible to prevent the sealing performance from being deteriorated due to the lip wear, and to improve the sealing performance, and to improve the bearing performance over a long period of time. A wheel bearing device that can be maintained 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 illustrated, but the present invention is not limited to this, and a double row angular ball bearing using a ball as the rolling element 4 may be used.

  FIG. 3 shows a modification of the backup seal 13 of FIG. The backup seal 16 includes a metal core 14 and a seal member 17 that is integrally vulcanized and bonded to the metal core 14. The base portion 17 a of the seal member 17 is fixed so as to cover the end portion on the inner side of the cored bar 14. As a result, the surface of the cored bar 14 is not exposed to the outside, and the expensive austenitic stainless steel plate can be changed to a relatively inexpensive cold rolled steel plate (JIS standard SPCC type or the like). Cost reduction can be achieved.

  FIG. 4 is an enlarged view showing a main part of a second embodiment of the wheel bearing device according to the present invention. This embodiment basically differs from the above-described embodiment only in the configuration of the core of the backup seal, and other parts having the same parts or the same functions as those of the above-described embodiment are denoted by the same reference numerals. Detailed description is omitted.

  In this embodiment, the backup seal 18 press-fitted into the outer periphery of the end portion of the outer member 3 includes a cored bar 19 and a seal member 20 that is integrally vulcanized and bonded to the cored bar 19. The metal core 19 is formed by pressing a cold-rolled steel plate into a substantially L-shaped cross section, and a cylindrical fitting portion 19a that is press-fitted into the outer periphery of the end of the outer member 3, and the fitting portion It has the convex part 19b bent by radial direction outward from the edge part of the inner side of 19a.

  On the other hand, the sealing member 20 is formed in a trumpet shape in which a base portion 20a fixed so as to cover the convex portion 19b of the core metal 19 and a radially extending outwardly extending from the base portion 20a, and a distal end portion having a larger diameter. Side lip 15b. With such a configuration, the rigidity of the metal core 19 is increased, the pull-out resistance of the backup seal 18 is increased, the reliability is improved, the contact pressure of the side lip 15b can be maintained, and a desired sealing is achieved over a long period of time. Sex can be secured.

  FIG. 5 is an enlarged view of a main part showing a third embodiment of the wheel bearing device according to the present invention. This embodiment is basically different from the second embodiment described above only in the configuration of the core of the backup seal, and other parts having the same parts or the same functions as those of the above-described embodiment have the same reference numerals. The detailed description is omitted.

  In this embodiment, the backup seal 21 that is press-fitted into the outer periphery of the end portion of the outer member 3 includes a cored bar 22 and a seal member 20 that is integrally vulcanized and bonded to the cored bar 22. The metal core 22 has a substantially Z-shaped cross section formed by press working from a cold rolled steel plate, and has a cylindrical fitting portion 19a that is press-fitted into the outer periphery of the end portion of the outer member 3, and the fitting portion. A convex portion 19b that is bent radially outward from the inner side end of 19a and an inner end of the fitting portion 19a that extends radially inward and is in close contact with the end surface 3c of the outer member 3. It has a flange 22a. With such a configuration, the rigidity of the cored bar 19 is further increased, the pull-out resistance of the backup seal 21 is further increased, the reliability is improved, the contact area of the seal press-fitting jig is increased, and the press-fitting property and the positioning accuracy are improved. To do.

  FIG. 6 shows a modification of the backup seal 21 shown in FIG. The backup seal 23 includes a metal core 24 and a seal member 20 that is integrally vulcanized and bonded to the metal core 24. The cored bar 24 is formed from a cold-rolled steel plate by press working so that a cross section is formed in a substantially Z shape, and a cylindrical fitting part 19a that is press-fitted into the outer periphery of the end part of the outer member 3; A convex portion 19b that is bent radially outward from the inner side end of 19a and an inner end of the fitting portion 19a that extends radially inward and is in close contact with the end surface 3c of the outer member 3. It has a flange 24a. The inner diameter of the flange 24a is set to be smaller than the outer diameter of the slinger 10 described above, and constitutes a labyrinth seal with the seal 8. Thereby, even if muddy water or the like enters from the backup seal 23, the sealing performance of the seal 8 can be improved.

  FIG. 7 is an enlarged view of a main part showing a fourth embodiment of the wheel bearing device according to the present invention. This embodiment is basically the same as the above-described third embodiment (FIG. 5) except for the configuration of the lip sliding contact portion, and the same parts or parts having the same functions as the above-described embodiment. Reference numerals are assigned and detailed description is omitted.

  In the present embodiment, the metal ring 25 is attached in close contact with the inner side surface 6 c of the wheel mounting flange 6. The side lip 15b of the backup seal 21 is in sliding contact with the metal ring 25 with a predetermined contact pressure. The metal ring 25 is made of a rust-proof steel plate such as 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 by press working and fastened to the wheel mounting flange 6 by a fixing bolt (not shown). The metal ring 25 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.

  With such a configuration, even if muddy water or the like stays in the narrow annular space between the hub wheel 1 and the wheel bearing 2 and the side surface 6c of the wheel mounting flange 6 rusts, the lip sliding contact surface is prevented from rusting. It is possible to prevent lip wear over a long period of time and improve the sealing performance.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, 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 a principal part enlarged view of FIG. It is a principal part enlarged view which shows the modification of a figure. 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 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows the modification of FIG. It is a principal part enlarged view which shows 4th Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. It is the A section enlarged view of FIG.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 1b ・ ・ ・ ・ ・ ・··· Serration 1c ····················································································・ ・ ・ ・ ・ ・ ・ ・ ・ Bearing bearing 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ External member 3a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outward rolling Running surface 3b ... Body mounting flange 3c ... End face 4 of the outer member ...・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 5a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 5b ………………………………………………………………………………………………………………………………………………………………………………………….・ ・Wheel mounting flange 6a ......... Hub bolts 6b, 15a, 20a ... Base 6c ... Side 7 on the inner side of the mounting flange 7 ... Retainer 8 ... Seal 9 ... ······································ Slinger 10a ························································································ Sealing members 12a, 12b, 15b Side lip 12c, 20b ... Radial lip 13, 16, 18, 21, 23 ... Backup seal 19a ... ··· Fitting portion 19b ········································································ ... Metal ring 51 ... Hub wheel 51a ... Small diameter step 51b ...・ ・ ・ ・ ・ ・ Serration 51c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping section 52 ・ ・ ・ ・ ・ ・ Wheel bearing 53・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 53a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside rolling surface 53b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 54 ... tapered roller 55 ... inner ring 55a ... Inner rolling surface 55b ..... Daegu 55c ... ·································· Wheel mounting flange 56a ··················· hub bolts 56b, 65a ...・ ・ Base 56c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner side 57 ・ ・ ・ ・ ・ ・ Cage 58 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ Seal 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal plate 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slinger 60a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・..... Cylinder part 60b ..... Standing plate parts 61, 64 ..... Core bars 62, 65 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Seal members 62a, 62b, 65b ・ ・ ・ ・ ・ ・ ・ ・ Side lip 62c ・ ・ ・ ・ ・ ・ ・ ・ Radial lip 63 ・ ・ ・ ・ ・ ・ ・ ・.... Backup seal 66 .............. metal ring 67 ............... fixing bolts

Claims (6)

An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
It consists of a hub ring that has a wheel mounting flange for mounting a wheel at one end and a small-diameter step formed on the outer periphery, and an outer ring member of an inner ring or constant velocity universal joint 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,
A back-up seal is attached to the outer end of the outer member, and the back-up seal has a cylindrical fitting that is press-fitted into the outer periphery of the end of the outer member. The seal member is integrally vulcanized and bonded, and the seal member extends in a radially outward direction and is formed in a trumpet shape in which a tip end portion is enlarged, and the side surface on the inner side of the wheel mounting flange A wheel bearing device, comprising: a side lip that is slidably contacted with the base lip, and a base portion of the side lip is fixed to an inner end of the cored bar.   2. The wheel bearing device according to claim 1, wherein the metal core has a convex portion bent radially outward from an end portion on an inner side of the fitting portion.   The wheel bearing according to claim 1, wherein the core bar has a flange portion that extends radially inward from an outer end portion of the fitting portion and is in close contact with an end surface of the outer member. apparatus.   The seal on the outer side of the seal is composed of an annular seal plate and a slinger that are arranged to face each other with a substantially L-shaped cross section, and the inner diameter of the flange portion of the cored bar is larger than the outer diameter of the slinger. The wheel bearing device according to claim 3, wherein a labyrinth seal is formed between the seal and the seal.   The wheel bearing device according to any one of claims 1 to 4, wherein a base portion of the side lip is fixed so as to cover an end portion on an inner side of the cored bar.   6. The metal ring having a rust-preventing ability in close contact with the inner side surface of the wheel mounting flange is mounted, and the side lip of the backup seal is in sliding contact with the metal ring. Wheel bearing device.

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