JP2007127243A - Bearing device for vehicle wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a vehicle wheel enhanced in assembling easiness and capable of enhancing the sealing performance of a seal. <P>SOLUTION: The bearing device for the vehicle wheel composed of double-row tapered roller bearings of back face butted types includes an outside joint member 14 which is integrally provided with a shoulder 20 provided or the peripheral surface with an inner raceway surface 14a and a cylindrical shaft 21 stretching from the shoulder 20 in the axial direction, in which a hub ring 11 and an outside joint member 14 are put by plastic bonding rigidly by expanding the shaft 21 diametrically to cause it to bite into a surface unevenness part 15 formed on the inside surface of the hub ring 11 together with a hardening process, and also tapered rollers 3 are held by a retainer 7 so as not to slip off toward the inside surface, and large flanges 2b to guide the rollers 3 are formed rigidly on major diametric sides of the outer raceway surfaces 2a of an exterior member 2. Accordingly the rollers 3 does not slip off from the retainer 7, and there is no risk that the retainer 7 moves to cause interference with the seal 22 in a state that an assembly is fitted to the exterior member 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wheel bearing device including a double-row tapered roller bearing that rotatably supports a wheel of an automobile or the like, and more particularly to a wheel bearing device that is improved in assemblability and seal 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.

  Further, the wheel bearing device has a structure called a first generation in which a wheel bearing composed of a double row angular ball bearing or the like is fitted between a knuckle and a hub wheel constituting a suspension device. Second generation structure in which body mounting flange or wheel mounting flange is formed directly on the outer periphery of the member, third generation structure in which one inner rolling surface is directly formed on the outer periphery of the hub wheel, or hub wheel, etc. It is roughly classified into a fourth generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the speed universal joint.

  An example of such a wheel bearing device is shown in FIG. This wheel bearing device 50 has a vehicle body mounting flange 51b integrally attached to a knuckle (not shown) on the outer periphery, and an outer side in which double row outer rolling surfaces 51a, 51a are formed on the inner periphery. A member 51, an inner member 55 having a double-row inner raceway surface 52a, 54a facing the outer-row outer raceway surfaces 51a, 51a on the outer periphery, and a double-row accommodated between the two raceway surfaces And the double row tapered roller bearings provided with retainers 57 and 57 for holding the double row tapered rollers 56 and 56 so as to roll freely.

  The inner member 55 integrally has a wheel mounting flange 53 for mounting a wheel (not shown) at one end, and faces the double-row outer rolling surfaces 51a, 51a of the outer member 51 on the outer periphery. One inner rolling surface 52a, a cylindrical small-diameter stepped portion 52b extending in the axial direction from the inner rolling surface 52a, and a hub wheel 52 in which a serration 52c for torque transmission is formed on the inner periphery, The inner ring 54 is press-fitted into the small-diameter step portion 52b of the hub wheel 52, and has an outer ring formed with the other inner rolling surface 54a facing the double row outer rolling surface 51a, 51a of the outer member 51 on the outer periphery. This constitutes the third generation structure on the drive wheel side.

  Hub bolts 60 for fastening the wheels are planted at equal intervals in the circumferential direction of the wheel mounting flange 53, and a seal 58 is provided at the opening of the annular space formed between the outer member 51 and the inner member 55. , 59 are installed to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust, etc. into the bearing from the outside.

Here, large flanges 52d and 54b for guiding the tapered rollers 56 are formed on the large diameter side of the inner raceway surfaces 52a and 54a of the hub ring 52 and the inner ring 54, and a small flange is formed on the small diameter side. Absent. The retainer 57 is formed by injection molding of a synthetic resin, and the roller assembly is configured by holding the tapered roller 56 in a pocket in a non-dropping state in an unassembled state. As a result, not only the number of parts and the product cost are reduced, but also the assembly by the automatic assembly apparatus is facilitated and the number of assembly steps is greatly reduced.
JP-A-11-44322

  In such a conventional wheel bearing device 50, as shown in FIG. 7A, the outer seal 58 is mounted immediately after the roller assembly is assembled into the outer member 51, and then the hub wheel 52 is moved to the outer member. 51. On the other hand, the inner ring 54 is press-fitted into the small-diameter step portion 52 b of the hub ring 52, and finally an inner-side seal 59 is attached between the outer member 51 and the inner ring 54. However, as shown in (b), in a state before the hub wheel 52 is inserted into the outer member 51, the roller assembly may move in the direction of the arrow and interfere with the seal 58. In this case, for example, the retainer 57 comes into contact with the seal 58 and the seal 58 moves, or the seal 58 is deformed or damaged, and a desired sealing performance cannot be exhibited.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a wheel bearing device that is improved in assemblability and sealing performance of a seal.

  In order to achieve such an object, the invention according to claim 1 of the present invention has a body mounting flange integrally attached to the suspension on the outer periphery, and has a taper-shaped compound that opens outward on the inner periphery. The outer member formed with the outer rolling surface of the row and the wheel mounting flange for attaching the wheel to one end are integrated, and one of the tapered shapes facing the outer rolling surface of the double row on the outer periphery A hub ring formed with an inner rolling surface and a small-diameter step portion extending in an axial direction from the inner rolling surface, and a tapered shape fitted to the hub ring and facing the outer rolling surface of the double row on the outer periphery An inner member formed of an inner ring formed with the other inner rolling surface or an outer joint member of a constant velocity universal joint, and a rolling device interposed between both rolling surfaces of the inner member and the outer member via a cage. Formed by double row tapered rollers accommodated movably, the outer member and the inner member And a seal mounted on the opening of the annular space, and a bearing device for a wheel constituted by a back-to-back type double row tapered roller bearing, wherein the retainer is formed from a synthetic resin by injection molding, and the tapered roller Is configured so as not to drop out toward the inner diameter side, and a large collar for guiding the tapered rollers is integrally formed on the larger diameter side of the outer rolling surface of the outer member.

  As described above, the outer member integrally having the vehicle body mounting flange on the outer periphery, the outer member having the double-row outer raceway formed on the inner periphery, and the wheel mounting flange integrally on the outer side end portion, The inner ring is formed of a hub ring in which one inner rolling surface is directly formed and an inner ring fitted to the hub ring and the other inner rolling surface is formed on the outer periphery or an outer joint member of a constant velocity universal joint. A seal attached to an opening of an annular space formed by a member, a double-row tapered roller that is rotatably accommodated between both rolling surfaces via a cage, and an outer member and an inner member A third- or fourth-generation wheel bearing device composed of back-to-back double-row tapered roller bearings, the cage is formed from synthetic resin by injection molding, and the tapered rollers fall off to the inner diameter side It is configured to be able to hold the Since a large collar for guiding the tapered roller is integrally formed on the large diameter side of the surface, the tapered roller does not fall out of the cage even in the state of the roller assembly, and the roller assembly is inserted into the outer member. In this state, the cage does not move and interfere with the seal. Therefore, it is possible to provide a wheel bearing device that is improved in assemblability and seal sealing performance.

  According to a second aspect of the present invention, the inner member includes the hub wheel and an inner ring that is press-fitted into the small-diameter step portion of the hub wheel through a predetermined shimiro. If the base on the inner side of the mounting flange is formed in an arc shape and the surface is hardened and the seal is in direct sliding contact, the device can be made compact and the rotating bending load applied to the wheel mounting flange can be reduced. In contrast, sufficient mechanical strength can be exhibited.

  According to a third aspect of the present invention, the outer joint member comprises a cup-shaped mouth portion, a bottom portion of the mouth portion, and a shoulder portion in which the inner rolling surface is directly formed on the outer periphery, and A shaft portion extending in the axial direction from the shoulder portion is integrally formed, and the hub wheel and the outer joint member are integrally plastically coupled by plastically deforming an end portion of the shaft portion and crimping the hub wheel. If this is the case, it is not necessary to control the preload by tightening firmly with a nut, etc., and it is possible to reduce the weight and size, improve the strength and durability of the hub wheel, and maintain the preload for a long period of time. Can be maintained.

  Preferably, as in the invention according to claim 4, a hardened uneven portion is formed on the inner diameter of the hub wheel, and the hollow fitting portion formed at the end portion of the shaft portion is expanded in diameter. If the hub wheel and the outer joint member are integrally plastically joined by biting into the concavo-convex portion, further reduction in weight and size can be achieved.

  Further, as in the invention according to claim 5, at least an inner side seal among the seals is a slinger that is press-fitted into the inner member, a core bar that is press-fitted into the outer member, and the core bar And an annular seal plate made of a vulcanized and bonded seal member, each having a substantially L-shaped cross-section, arranged opposite to each other, and the seal member having a side lip that is in sliding contact with the slinger If they are integrated, the sealing performance can be improved over a long period of time.

  The wheel bearing device according to the present invention has a vehicle body mounting flange integrally attached to the suspension device on the outer periphery, and is formed with a tapered double row outer rolling surface that opens outward on the inner periphery. The outer member and a wheel mounting flange for attaching the wheel to one end are integrated, and one tapered inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and the inner rolling surface. A hub wheel formed with a small-diameter step portion extending in the axial direction from the running surface, and the other tapered inner rolling surface that is fitted to the hub wheel and faces the outer rolling surface of the double row are formed on the outer periphery. An inner member composed of an outer joint member of an inner ring or a constant velocity universal joint, and a double row accommodated between the rolling surfaces of the inner member and the outer member via a retainer. An opening in the annular space formed by the tapered roller and the outer member and the inner member is mounted. In a wheel bearing device composed of a back-to-back type double-row tapered roller bearing, the cage is formed from a synthetic resin by injection molding so that the tapered roller does not fall off to the inner diameter side. Since the large collar for guiding the tapered roller is integrally formed on the large diameter side of the outer raceway surface of the outer member, the tapered roller can be held in the roller assembly state. The retainer does not move and interfere with the seal while the roller assembly is fitted in the outer member. Therefore, it is possible to provide a wheel bearing device that is improved in assemblability and seal sealing performance.

  An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and formed with a tapered double row outer rolling surface opened outward on the inner periphery, and a wheel on one end A wheel mounting flange for integrally mounting, a tapered inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a small diameter step portion extending in the axial direction from the inner rolling surface And an outer joint member of a constant velocity universal joint that is fitted to the hub wheel and has a tapered inner inner rolling surface that faces the outer rolling surface of the double row on the outer periphery. An inner member, a double-row tapered roller housed between the rolling surfaces of the inner member and the outer member via a cage, and the outer member and the inner member. And a seal attached to the opening of the annular space formed by In the wheel bearing device constituted by a row tapered roller bearing, the outer joint member includes a shoulder portion in which the inner rolling surface is directly formed on an outer periphery, and a cylindrical shaft portion extending in an axial direction from the shoulder portion. The hub ring and the outer joint member are integrally plastically bonded by forming the shaft portion with a diameter and hardening the inner diameter of the hub wheel so as to bite into the uneven portion formed. The retainer is formed of synthetic resin by injection molding, and is configured to be able to hold the tapered roller so as not to drop to the inner diameter side, and guides the tapered roller to the larger diameter side of the outer rolling surface of the outer member. Daegu is integrally formed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, and FIG. 2 is an enlarged view of a main part of FIG. 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 the third generation, and is a double row tapered roller accommodated in a freely rollable manner between the inner member 1, the outer member 2, and both members 1,2. 3 and 3. The inner member 1 includes a hub ring 4 and an inner ring 5 that is press-fitted into the hub ring 4 through a predetermined scissors.

  The hub wheel 4 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at one end, and has an inner rolling surface 4a on one outer side (tapered outer side) and the inner rolling surface. A small diameter step 4b extending in the axial direction from the surface 4a is formed, and a serration (or spline) 4c 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 inner ring 5 is formed with the other inner (inner side) inner raceway surface 5 a on the outer periphery, and is press-fitted into the small-diameter step portion 4 b of the hub ring 4. 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. Note that roller guide large collars and roller holding small collars are not formed at both ends of the inner rolling surfaces 4a and 5a of the hub wheel 4 and the inner ring 5, and the outer rolling of the outer member 2 described later is performed. A large spear 2b is formed integrally with the running surface 2a.

  The hub wheel 4 is formed of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the like from an inner rolling surface 4a and a base 6b formed in an arc shape on the inner side of the wheel mounting flange 6. The surface hardness is hardened to a range of 58 to 64 HRC by induction hardening over the small diameter step 4b. As a result, the wear resistance of the base portion 6b which becomes the seal land portion of the seal 8 is improved, and the mechanical strength is sufficient with respect to the rotational bending load applied to the wheel mounting flange 6, and the inner ring 5 is fitted. The fretting resistance of the small-diameter step portion 4b that becomes the portion is improved.

  The outer member 2 integrally has a vehicle body mounting flange 2b to be attached to a knuckle (not shown) on the outer periphery, and faces the double row inner rolling surfaces 4a and 5a of the inner member 1 on the inner periphery. Each of the tapered double-row outer rolling surfaces 2a and 2a, which are open outwardly, is integrally formed. Double-row tapered rollers 3 and 3 are accommodated between these rolling surfaces, and are held by rollers 7 and 7 so as to roll freely. This outer member 2 is formed of medium carbon steel containing carbon 0.40 to 0.80 wt% such as S53C, and the double row outer rolling surfaces 2a and 2a have a surface hardness in the range of 58 to 64HRC by induction hardening. Has been cured.

  Further, seals 8 and 9 are attached to the opening of the annular space formed between the outer member 2 and the inner member 1. Specifically, the outer seal 8 is in sliding contact with the base 6 b of the wheel mounting flange 6, and the inner seal 9 is attached to the inner periphery of the end of the outer member 2 and the outer periphery of the inner ring 5. It consists of a seal. These seals 8 and 9 prevent the grease sealed inside the bearing from leaking outside and preventing rainwater, dust, and the like from entering the bearing from the outside. Although the third generation structure on the drive wheel side is illustrated here, the wheel bearing device according to the present invention is not limited to this, and any wheel bearing device in which the inner raceway surface is integrally formed on the hub wheel may be used. It may be on the driving wheel side or may have a fourth generation structure.

  Here, in this embodiment, as shown in an enlarged view in FIG. 2, a large collar 2b for guiding the tapered roller 3 is integrally formed on the large diameter side of the outer rolling surface 2a of the outer member 2. . The outer seal 8 is mounted on the inner periphery of the large collar 2b. The cage 7 is formed by injection molding in which a reinforcing material such as GF (glass fiber) is added to a base of a thermoplastic resin such as PA (polyamide) 66 so that the tapered roller 3 does not fall off to the inner diameter side. keeping. Thus, the tapered roller 3 does not fall off from the cage 7 even in the roller assembly state, and the cage 7 moves and interferes with the seal 8 in a state where the roller assembly is inserted into the outer member 2. Never do. Therefore, it is possible to provide a wheel bearing device that is improved in assemblability and seal sealing performance.

  FIG. 3 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, FIG. 4 is an enlarged view of a main part of FIG. 3, and FIG. 5 is an assembly of the wheel bearing device according to the present invention. It is explanatory drawing which shows a method. In addition, the same code | symbol is attached | subjected to the site | part which has the same components same site | part as the embodiment mentioned above, or the same function, and detailed description is abbreviate | omitted.

  This wheel bearing device is referred to as a fourth generation, and includes a hub wheel 11, a double row rolling bearing 12 and a constant velocity universal joint 13 formed as a unit. The double-row rolling bearing 12 includes an inner member 10, an outer member 2, and double-row tapered rollers 3 and 3 accommodated between the members 10 and 2 so as to be freely rollable. The inner member 10 includes a hub wheel 11 and an outer joint member 14 that is fitted into the hub wheel 11 and plastically coupled.

  The hub wheel 11 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at one end, and has an inner rolling surface 11a that is tapered on the outer periphery (outer side), and this inner rolling. A small diameter step portion 11b extending in the axial direction from the surface 11a is formed. The hub wheel 11 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the inner raceway surface 11a and the inner side base portion 6b of the wheel mounting flange 6 to the small diameter step portion 11b. Thus, the surface hardness is set to a range of 58 to 64 HRC by induction hardening. Thereby, it has sufficient mechanical strength with respect to the rotational bending load loaded on the wheel mounting flange 6.

  Further, an uneven portion 15 is formed on the inner periphery of the hub wheel 11, and the surface is hardened by heat treatment so that the surface hardness is in the range of 54 to 64 HRC. As the heat treatment, local heating is preferable, and quenching by high-frequency induction heating that can set the hardened layer depth relatively easily is preferable. The concave and convex portion 15 is formed in the shape of an iris knurl, and is a cross groove formed by orthogonally crossing a plurality of annular grooves formed independently by turning or the like and a plurality of axial grooves formed by broaching or the like. Alternatively, it consists of a cross groove composed of spiral grooves inclined with respect to each other. Further, in order to ensure good biting property, the tip of the concavo-convex portion 15 is formed in a spire shape such as a triangular shape.

  The constant velocity universal joint 13 includes an outer joint member 14, a joint inner ring 16, a cage 17, and a torque transmission ball 18. The outer joint member 14 is made of medium carbon steel containing carbon 0.40 to 0.80 wt% such as S53C, and has a cup-shaped mouth portion 19, a shoulder portion 20 that forms the bottom portion of the mouth portion 19, and the shoulder portion 20. A cylindrical shaft portion 21 extending in the axial direction from is integrally formed. The shaft portion 21 is formed with an in-row portion 21a that is cylindrically fitted to the small-diameter step portion 11b of the hub wheel 11 through a predetermined radial clearance, and a fitting portion 21b is formed at the end of the in-row portion 21a. .

  An axially extending track groove 19 a having a curved portion is formed on the inner periphery of the mouse portion 19, and a track groove 16 a corresponding to the track groove 19 a is formed on the outer periphery of the joint inner ring 16. A torque transmission ball 18 is accommodated between the track grooves 19a and 16a via a cage 17. Further, on the outer periphery of the shoulder portion 20, a tapered other inner (inner side) inner rolling surface 14a is formed opposite to the double row outer rolling surfaces 2a, 2a. Then, the surface hardness is set to a range of 58 to 64 HRC by induction hardening from the seal fitting portion where the track groove 19a and the seal 22 on the inboard side are in sliding contact to the inner rolling surface 14a and the shaft portion 21. ing. Here, the fitting part 21b of the shaft part 21 is left raw after forging.

  Double row tapered rollers 3 and 3 are accommodated between double row outer raceway surfaces 2a and 2a of outer member 2 and double row inner raceway surfaces 11a and 14a opposed to these, and cage 7, 7 is held so as to roll freely. Further, seals 22 and 22 are attached to both ends of the outer member 2 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater, dust, and the like from the outside into the bearing. These double-row rolling bearings 12 are so-called back-to-back type double-row cones in which the action lines of the acting directions of the forces applied to the rolling surfaces 2a, 11a and 2a, 14a are separated in the axial direction toward the axial center. It constitutes a roller bearing.

  Here, in this embodiment, as shown in an enlarged view in FIG. 4, a large collar 2 b for guiding the tapered roller 3 is integrally formed on the large diameter side of the outer rolling surface 2 a of the outer member 2. . And the seal | sticker 22 is mounted | worn with the inner periphery of this large collar 2b. This prevents the retainer 7 from moving and interfering with the seal 22 in a state in which the roller assembly is inserted into the outer member 2, and preventing the seal 22 from being deformed or damaged. .

  The seal 22 includes a slinger 25 that is press-fitted into the base portion 6b of the wheel mounting flange 6, and an annular seal plate 26 that is mounted on the outer member 2 so as to face the slinger 25 and has a substantially L-shaped cross section. This constitutes a pack seal. Slinger 25 has a substantially L-shaped cross section by press working from austenitic stainless steel plate (JIS standard SUS304 type, etc.) or rust-proof cold rolled steel plate (JIS standard SPCC type, etc.). A cylindrical portion 25a formed and fitted to the base portion 6b (shoulder portion 20), and a standing plate portion 25b extending radially outward from the cylindrical portion 25a.

  On the other hand, the seal plate 26 is composed of a core metal 27 fitted into the end portion of the outer member 2 and a seal member 28 integrally vulcanized and bonded to the core metal 27. The core metal 27 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 seal member 28 includes a pair of side lips 28 a and 28 b that are in sliding contact with the standing plate portion 25 b of the slinger 25, and a radial lip 28 c that is in sliding contact with the cylindrical portion 25 a of the slinger 25.

Next, the assembly method of the wheel bearing device according to the present embodiment will be described in detail with reference to FIG.
First, the tapered roller 3 is held by the cage 7 to constitute a roller assembly, and this roller assembly is temporarily inserted into the double row outer raceway surfaces 2 a and 2 a of the outer member 2. Thereafter, seal plates 26 constituting the seal 22 are respectively attached to both ends of the outer member 2, and the hub wheel 11 in which the slinger 25 is press-fitted into the base 6 b of the wheel mounting flange 6, and the slinger 25 is press-fitted into the shoulder 20. The outer joint member 14 is inserted in the direction of the arrow from both sides. Then, the shoulder portion 20 of the outer joint member 14 is abutted against the end face of the small-diameter step portion 11b of the hub wheel 11, and the shaft portion 21 is fitted into the hub wheel 11 until it comes into a butted state. Further, a diameter expanding jig such as a mandrel is pushed into the inner diameter of the fitting portion 21b in the shaft portion 21 to increase the diameter of the fitting portion 21b, and the fitting portion 21b is bitten into the uneven portion 15 of the hub wheel 11. By caulking, the hub wheel 11 and the outer joint member 14 are integrally plastically joined to complete. As a result, it is not necessary to control the preload by tightening firmly with a nut or the like as in the prior art, so that the weight and size can be reduced, the strength and durability of the hub wheel 11 can be improved, and the length can be increased. The amount of preload can be maintained for a period. End caps 23 and 24 are attached to the open end portion of the hub wheel 11 and the hollow shaft portion 21 to prevent rainwater or the like from entering the plastic coupling portion and rusting the portion, and the mouth portion. The grease sealed in 19 is prevented from leaking to the outside.

  In the double row rolling bearing 12 composed of double row tapered roller bearings, the tapered rollers 3 and 3 rub against each other in the generatrix direction of each rolling surface when the bearing is assembled. It is difficult to secure. That is, the lubricant such as grease is retracted from the contact portions between these surfaces and becomes close to metal contact, and the friction coefficient of each contact portion increases. For this reason, the tapered rollers 3 and 3 are assembled in an unaligned state without smoothly moving to the large collars 2b and 2b guided. For example, even when the internal clearance should be negative, the positive internal clearance remains, and there is a possibility that a desired preload cannot be applied. In particular, when a so-called skew occurs in which the central axes of the tapered rollers 3 and 3 are inclined with respect to the normal rotation axis, such a problem becomes more prominent.

  In the present embodiment, in order to avoid such a problem, the hub wheel 11, the outer joint member 14, and the outer member 2 are relatively swung (reciprocating) or rotated in the above-described diameter expansion caulking process. Plastic bonding is performed while rotating in one direction. Actually, with the hub wheel 11 supported on the upper surface of the work table, the outer member 2 is swung with respect to the hub wheel 11 and a diameter expansion jig is pushed into the shaft portion 21 of the outer joint member 14. The two are plastically connected. By doing so, the double-row tapered rollers 3 and 3 are smoothly rubbed on the respective rolling surfaces and stably aligned with the large flanges 2b and 2b, and a predetermined preload can be applied with high accuracy.

  In addition to the configuration exemplified as the means for plastically coupling the hub wheel 11 and the outer joint member 14, for example, although not shown, the shaft portion of the outer joint member is fitted into the hub wheel, and the shaft portion A so-called swing caulking method may be employed in which the end portion is plastically deformed radially outward to form a caulking portion, and both members are fixed in the axial direction by the caulking portion.

  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 first 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 longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the assembly method of the wheel bearing apparatus of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. (A) is explanatory drawing which shows the assembly method of the wheel bearing apparatus of FIG. (B) is the principal part enlarged view of (a).

Explanation of symbols

1, 10 ... Inner member 2 ... Outer member 2a ...・ ・ ・ ・ ・ Outer rolling surface 2b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Otsuchi 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Tapered rollers 4, 11 ・·················· Hub hubs 4a, 5a, 11a, 14a ... Inner rolling surface 4b, 11b ... Small diameter step 4c・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Serration 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting Flange 6a ... hub bolt 6b ... base 7 ... ..Retainer 8, 9, 22 ......... Seal 12 ... Rolling bearing 13 ... Constant velocity universal joint 14 ... Outer joint member 15 ... ······································································· Joint inner ring 16a, 19a ... ·········································· Torque transmission ball 19 ... shoulder 21 ... shaft 21a ... inrow 21b ..... fitting part 23, 24 ... end cap 25 ...・ Slinger 25a ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylinder part 25b ・ ・ ・····················································· Sealing plate 27 ··········· Sealing members 28a and 28b ··· Side lip 28c · · · · · · · · Radial lip 50 ............... wheel bearing device 51 ............... outer member 51a ........... ... Outer rolling surface 51b ..... Body mounting flange 52 ..... Hub wheels 52a, 54a ...・ ・ ・ ・ ・ ・ Inner rolling surface 52b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter stepped portion 52c ・ ・ ・ ・ ・ ・ ・ ・ ・ Serrations 52d, 54b・ ・ ・ ・ ・ ・ ・ Daegu 53 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Wheel mounting flange 54 ... Inner ring 55 ... Inner member 56 ... ·············································································.・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt

Claims (5)

An outer member integrally having a vehicle body mounting flange for being attached to a suspension device on the outer periphery, and having a tapered double row outer rolling surface formed outwardly on the inner periphery,
It has a wheel mounting flange for mounting the wheel at one end, and has one tapered inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and an axial direction from this inner rolling surface. A hub ring formed with an extending small-diameter stepped portion, and an inner ring or constant speed which is fitted to the hub ring and has a tapered inner inner rolling surface facing the outer rolling surface of the double row on the outer periphery. An inner member composed of an outer joint member of a universal joint;
A double-row tapered roller accommodated between the rolling surfaces of the inner member and the outer member so as to be freely rollable via a cage;
In a wheel bearing device comprising a back-to-back type double row tapered roller bearing, comprising a seal attached to an opening of an annular space formed by the outer member and the inner member,
The retainer is formed by injection molding from a synthetic resin, and is configured to be able to hold the tapered roller so as not to drop toward the inner diameter side, and the tapered roller on the larger diameter side of the outer rolling surface of the outer member. A bearing device for a wheel, characterized in that a large collar for guiding the wheel is integrally formed.   The inner member is composed of the hub wheel and an inner ring press-fitted into the small-diameter step portion of the hub wheel via a predetermined shimiro, and the base portion on the inner side of the wheel mounting flange is formed in an arc shape. The wheel bearing device according to claim 1, wherein the surface is hardened and the seal is in direct sliding contact.   The outer joint member is integrally formed with a cup-shaped mouth portion, a shoulder portion that forms the bottom portion of the mouth portion, the inner rolling surface is directly formed on the outer periphery, and a shaft portion that extends in the axial direction from the shoulder portion. 2. The wheel bearing device according to claim 1, wherein the hub wheel and the outer joint member are integrally formed by plastic deformation by plastically deforming an end portion of the shaft portion and crimping the end portion of the shaft portion.   The hub wheel and the outer joint are formed by forming a hardened concave and convex portion on the inner diameter of the hub ring, and expanding the hollow fitting portion formed at the end of the shaft portion to bite into the concave and convex portion. The wheel bearing device according to claim 3, wherein the member is integrally plastically coupled.   At least an inner side seal of the seals is formed of a slinger that is press-fitted into the inner member, a metal core that is press-fitted into the outer member, and a seal member that is integrally vulcanized and bonded to the metal core. 5. Each of the sealing plates is formed in a substantially L-shaped cross section and arranged to face each other, and the sealing member integrally has a side lip that is in sliding contact with the slinger. The wheel bearing apparatus described in 1.

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