JP2019135401A - Wheel bearing device - Google Patents

Abstract

To improve rigidity of a flange part in a wheel bearing device in which the flange part coming into contact with conical rollers is provided at an outer member.SOLUTION: A wheel bearing device 1 includes: an outer ring 2 which is an outer member having a plurality of rows of outside raceway surfaces 2c, 2d; a hub ring 3 and an inner ring 4 which are inner members comprising at least one inner ring and including inside raceway surfaces 4a, 3e facing the plurality of rows of outside raceway surfaces 2c, 2d on an outer periphery; and a plurality of rows of conical rollers 5a, 5b stored between raceway surfaces of the outer member and the inner members respectively so as to roll. A flange part 20 protruding radially inside is formed on the outer side of the inner peripheral surface of the outer member, and the flange part 20 has a flange surface 21 coming into contact with a large end surface 5b1 of the conical roller 5b on the outer side. At the outer ring 2, a padding part 24 protruding radially inside from the flange part 20 is provided.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a wheel bearing device.

  2. Description of the Related Art Conventionally, a wheel bearing device that rotatably supports a wheel in a suspension device such as an automobile is known. In the wheel bearing device, an inner member is rotatably supported by an outer member via a rolling element. For example, a taper bearing (tapered roller bearing) in which a rolling element is a tapered roller can be used for a bearing of a vehicle having a relatively large body weight such as a pickup truck or a large SUV (Sports Utility Vehicle). Is done. Tapered bearings are also required to be unitized, and there are wheel bearing devices called so-called second generation type and third generation type.

  For example, Patent Document 1 describes a wheel bearing device of a double row tapered roller bearing type in which a flange is provided on the outboard (outer) side of the inner peripheral surface of an outer ring as shown in FIG. The collar portion has a collar surface that contacts the large end surface of the tapered roller. In this wheel bearing device, recesses are provided on the large end surface and the small end surface of the tapered roller on the outboard side, and a protrusion inserted into the recess is provided on the retainer on the outboard side. The circumscribed circle diameter of the tapered roller before the hub ring is inserted is made smaller than the inner diameter dimension of the flange portion of the outer ring. When the hub wheel is inserted into the outer ring, the tapered roller moves in the radial direction, the circumscribed circle diameter becomes larger than the inner diameter dimension of the flange portion, and the tapered roller is stored in a specified position. By configuring in this way, the roller assembly on the outboard side can be easily incorporated into the outer ring having the flange on the inner peripheral surface on the outboard side, and the assembly workability can be improved. become.

Japanese Patent No. 4064433

  However, the outer ring generally has three or four fastening points with the knuckle, and the axial force is partially applied to the outer ring, thereby deteriorating the roundness of the outer ring collar. As a result, there are concerns about adverse effects such as a reduction in bearing life.

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a wheel bearing device capable of preventing the roundness deterioration of the flange portion of the outer member.

The first invention is
An outer member having a double row outer raceway surface;
An inner member having a hub ring and an inner ring fitted to the hub ring, and having an inner raceway surface facing an outer raceway surface of the double row on an outer periphery;
A double row tapered roller housed in a freely rollable manner between the respective raceway surfaces of the outer member and the inner member;
In the wheel bearing device having a flange surface protruding radially inward on the outer side of the inner peripheral surface of the outer member, the flange portion having a flange surface that contacts the large end surface of the tapered roller,
The outer member is provided with a built-up portion protruding radially inward from the flange portion.

The second invention is
On the large end surface of the tapered roller, a thinning is provided,
The build-up part protrudes from the collar part so as to face the thinning.

The third invention is
The build-up part is
It is formed between the axial direction from the radially inner peripheral edge of the flange surface to the outer side end of the outer member,
A step portion is provided between the build-up portion and the outer side end of the outer member.

The fourth invention is
The build-up part is
The taper surface is provided continuously from the flange surface and is spaced from the tapered roller toward the outer side.

  As effects of the present invention, the following effects can be obtained.

  In the wheel bearing device according to the first invention, the outer member is provided with a built-up portion that protrudes radially inward from the flange portion. Thereby, the thickness in the vicinity of the collar portion increases, and the annular outer member can be prevented from being flattened. That is, the ring rigidity of the collar is improved, and the roundness of the collar can be prevented from being deteriorated when the knuckle is fastened. As a result, it is possible to prevent adverse effects such as a reduction in bearing life due to deterioration in roundness and seizure due to a change in the contact state of an operating part such as a tapered roller.

  In the wheel bearing device according to the second aspect of the invention, the built-up portion protrudes from the flange portion so as to face the thinning formed on the large end surface of the tapered roller. Thereby, the ring rigidity of the said collar part can also be improved, ensuring the area of the collar surface of the collar part required in order to guide the large end surface of a tapered roller.

  In the wheel bearing device according to the third invention, a step portion is provided between the built-up portion and the outer side end of the outer member. Thereby, the build-up part can be formed only in the part with the high effect which suppresses a deformation | transformation of an outer member, and the weight increase of a bearing can be suppressed.

  In the wheel bearing device according to the fourth aspect of the invention, the built-up portion is provided continuously from the flange surface and has a tapered surface that is spaced from the tapered roller to the outer side. As a result, the concentration of stress is mitigated (stress distribution) and the ring rigidity of the heel portion is further increased by providing a relatively smooth connection without forming a step between the build-up portion and the heel surface. Can be improved.

The perspective view which shows the whole structure of the wheel bearing apparatus which concerns on one Embodiment of this invention. Sectional drawing which shows the whole structure of the wheel bearing apparatus which concerns on one Embodiment of this invention. The expanded sectional view which expands and shows the collar part of the outer ring | wheel in FIG. The expanded sectional view which expands and shows the collar part concerning 2nd embodiment. The expanded sectional view which expands and shows the collar part of the outer ring | wheel with which the conventional wheel bearing apparatus is provided.

  Below, the wheel bearing apparatus 1 which concerns on 1st embodiment of this invention is demonstrated using FIGS. 1-5.

  As shown in FIGS. 1, 2, and 3, the wheel bearing device 1 supports a wheel rotatably in a suspension device of a vehicle such as an automobile. The wheel bearing device 1 is a double-row tapered roller bearing type, and is a third-generation type wheel bearing device for supporting driving wheels. The wheel bearing device 1 includes an outer ring 2 that is an outer member, a hub ring 3 and an inner ring 4 that are inner members, a tapered roller 5 a on an inner side interposed between the outer ring 2 and the inner ring 4, and an outer ring. 2 and an outer side tapered roller 5 b interposed between the hub wheel 3, an inner side sealing member 6, and an outer side sealing member 9. In the present specification, the inner side represents the vehicle body side of the wheel bearing device 1 when the wheel bearing device 1 is attached to the vehicle body, and the outer side refers to the wheel bearing device 1 attached to the vehicle body. The wheel side of the wheel bearing device 1 at the time is shown.

  The outer ring 2 that is an outer member supports the hub ring 3 and the inner ring 4 that are inner members. The outer ring 2 is formed in a substantially cylindrical shape. In the outer ring 2, an inner side opening 2 a into which the inner side seal member 6 can be fitted is formed at the inner side end of the outer ring 2 arranged on the vehicle body side when the vehicle is mounted.

  On the inner peripheral surface of the outer ring 2, an outer side outer raceway surface 2c and an outer side outer raceway surface 2d, which are formed in an outwardly tapered shape, are formed so as to be parallel to each other in the circumferential direction. Yes. The outer raceway surface 2d on the outer side and the outer raceway surface 2c on the inner side are formed so as to have the same roller pitch circle diameter. The outer ring 2 has a plurality (four in this embodiment) of vehicle body mounting flanges 2e for mounting on a knuckle (vehicle body) of a suspension device (not shown) on the outer peripheral surface thereof. The vehicle body attachment flange 2 e protrudes radially outward from the outer peripheral surface of the outer ring 2. Each vehicle body mounting flange 2e is provided with a bolt insertion hole 2f for inserting a fastening member (here, a bolt) for fixing the knuckle and the outer ring 2.

  In addition, the outer ring 2 is formed with a flange 20 protruding radially inward on the inner peripheral surface of the outer side end. The flange 20 is provided adjacent to the large-diameter side end of the outer raceway surface 2d. The flange portion 20 guides the large end surface 5b1 of the tapered roller 5b. The flange portion 20 has a flange surface 21 which is an inwardly open tapered surface facing the large end surface 5b1 of the tapered roller 5b on the outer side and receiving and guiding the large end surface 5b1 of the tapered roller 5b. The flange surface 21 is in contact with the large end surface 5b1 of the outer tapered roller 5b when the wheel bearing device 1 is rotated. Moreover, the outer ring | wheel 2 has the overlaying part 24 (light ink part of FIG. 2, FIG. 3) which protrudes in the radial inside from the collar part 20 (the inner peripheral surface). The built-up portion 24 is located on the radially inner side with respect to the radially inner peripheral edge of the flange surface 21.

  The built-up portion 24 includes a tapered surface 22 that is an inwardly-opening annular tapered surface that is continuous with the radially inner peripheral edge of the flange surface 21, and a shaft that is continuously connected to the radially inner peripheral edge of the tapered surface 22. And a circumferential surface portion 23 parallel to the direction. That is, the flange portion 20 has an annular flange surface 21 that faces the large end surface 5b1 of the outer tapered roller 5b, and a tapered surface 22 that is connected to the radially inner peripheral edge of the flange surface 21. The tapered surface 22 is inclined at a predetermined angle θ1 with respect to the axial direction.

  The taper surface 22 is an inner peripheral surface on the flange surface 21 side of the built-up portion 24, is continuously provided from the flange surface 21, and extends so as to be separated from the outer side tapered roller 5 b to the outer side. That is, the inclination angle of the tapered surface 22 with respect to the axial direction is formed smaller than the inclination angle of the flange surface 21 with respect to the axial direction. Concave-curved thin portions 30 are formed along the circumferential direction at the corners between the radially outer peripheral edge of the flange surface 21 and the large-diameter side end of the inner raceway surface 3e on the outer side. The built-up portion 24 protrudes radially inward to the extent that it does not contact the outer peripheral surface of the outer cage 12. As the range of the predetermined angle θ1, the upper limit angle is an angle that does not contact the large end surface 5b1 of the tapered roller 5b. As the predetermined angle θ1 becomes larger, the flange surface 21 and the tapered surface 22 are smoothly and continuously adjacent to each other, so that stress concentration can be reduced. Moreover, by forming the built-up portion 24 in the outer side opening portion of the outer ring 2, the secondary moment of the cross section is increased, and the ring rigidity of the outer side opening portion is improved.

  The inner member is constituted by the hub ring 3 and the inner ring 4. The hub wheel 3 constituting the inner member rotatably supports a vehicle wheel (not shown). The hub ring 3 is formed in a substantially cylindrical shape, and is made of, for example, medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C. In the hub wheel 3, a small-diameter step portion 3a having a reduced diameter on the outer peripheral surface is formed at an inner side end portion disposed on the vehicle body side when the vehicle is mounted. One side end of the small diameter step portion 3a is one side end of the hub wheel 3, and a caulking portion 3b described later is formed. In the hub wheel 3, a wheel mounting flange 3 c for mounting a wheel is integrally formed at an outer side end disposed on the wheel side when the vehicle is mounted. The wheel mounting flange 3c is provided with hub bolts 3d at equal circumferential positions. Further, on the outer peripheral surface on the outer side of the hub wheel 3, a circumferentially tapered inner raceway surface 3 e is arranged so as to face the outer raceway surface 2 d on the outer side of the outer ring 2.

  The hub wheel 3 has a surface hardness of 58 to 64 HRC by induction hardening from the inner-side small-diameter step portion 3a to the outer-side inner raceway surface 3e. As a result, the hub wheel 3 has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 3c, and the durability of the hub wheel 3 is improved. The hub ring 3 is formed with a caulking portion 3b in which an inner ring 4 is fitted to the small-diameter step portion 3a and one end portion is plastically deformed radially outward in order to fix the inner ring 4. The hub ring 3 has an inner raceway surface 4e formed on the outer side, with an inner raceway surface 4a formed on the outer peripheral surface of the inner ring 4 at the inner side end facing the inner raceway outer raceway surface 2c. Is arranged so as to face the outer raceway surface 2d on the outer side of the outer ring 2. The inner circumference of the hub wheel 3 is configured as a connection hole 3f in which serrations (or splines) for torque transmission are formed.

  The inner ring 4 is formed in a substantially cylindrical shape. The inner ring 4 is made of, for example, high carbon chrome bearing steel such as SUJ2, and is hardened in the range of 58 to 64 HRC up to the core portion by quenching. Thereby, the inner ring 4 has sufficient mechanical strength and durability against the rotational bending load applied to the vehicle body mounting flange 2e. On the outer peripheral surface of the inner ring 4, a tapered inner raceway surface 4 a that is annular in the circumferential direction and opens outward is formed. The inner ring 4 is press-fitted into the inner side end of the hub wheel 3 and the inner side end is fixed by a caulking portion 3b. That is, the inner ring 4 is press-fitted into the small-diameter step portion 3 a of the hub ring 3, and an inner raceway surface 4 a is configured by the inner ring 4 on the inner side of the hub ring 3.

  The inner side tapered rollers 5a and the outer side tapered rollers 5b, which are two rows of rolling elements, rotatably support the hub wheel 3 and the inner ring 4. The plurality of tapered rollers 5 a on the inner side and the tapered rollers 5 b on the outer side are held in a ring shape by the cage 12. The built-up portion 24 extends radially inward and faces the outer peripheral surface of the outer side end portion of the cage 12 with a predetermined interval. The inner side tapered roller 5 a is sandwiched between the inner raceway surface 4 a of the inner ring 4 and the outer raceway surface 2 c on the inner side of the outer ring 2 so as to roll freely. The outer side tapered roller 5b is sandwiched between the inner raceway surface 3e of the hub wheel 3 and the outer raceway surface 2d on the outer side of the outer ring 2 so as to be freely rollable. That is, the inner side tapered roller 5 a and the outer side tapered roller 5 b support the hub ring 3 and the inner ring 4 rotatably with respect to the outer ring 2. At the center of the large end surface 5b1 of the tapered roller 5b, a circular recess is provided in advance during forging in order to increase grinding efficiency. Below, the hollow of the said big end surface 5b1 is called the thinning 5b2. Here, the center O of the large end face 5b1 and the fillet 5b2 coincide.

  The inner side sealing member 6 closes the space between the inner side opening 2 a of the outer ring 2 and the inner ring 4. The inner side seal member 6 includes an annular seal ring 7 and an annular slinger 8. The inner seal member 6 is disposed so that the seal ring 7 and the slinger 8 face each other. The seal ring 7 is fitted into the inner side opening 2a of the outer ring 2 of the outer member. The slinger 8 is fitted to the outer periphery of the inner member (the outer periphery of the inner ring 4). In this way, the inner seal member 6 prevents intrusion of dust or the like or leakage of grease.

  As shown in FIG. 3, the outer side seal member 9 closes the space between the outer side end portion of the outer ring 2 and the hub ring 3. The outer side seal member 9 is fitted (externally fitted) to the outer side end of the outer ring 2. The outer side seal member 9 is composed of a core metal 10 and a seal rubber 11. The core metal 10 is made of, for example, a stainless steel plate such as SUS430 or SUS304, or a cold rolled steel plate such as SPCC. The core metal 10 has a shape in which an annular steel plate is deformed by press working and an axial cross-section is bent into a substantially L shape. Thereby, the cored bar 10 is formed with a cylindrical fitting portion 10 a and a disk-shaped side plate portion 10 b extending from the end portion toward the hub wheel 3. In addition, the sealing rubber 11 which is an elastic body is vulcanized and bonded to the fitting portion 10a and the side plate portion 10b.

  The seal rubber 11 is, for example, synthetic rubber such as NBR (acrylonitrile-butadiene rubber), HNBR (hydrogenated acrylonitrile-butadiene rubber), EPDM (ethylene propylene rubber), ACM (polyacrylic rubber), FKM (fluororubber), or silicon rubber. It consists of The seal lips 11a and 11b formed on the seal rubber 11 are so-called main lips, and their tip portions are in contact with the seal flat surface portion 3g of the wheel mounting flange 3c. The seal lip 11c is a so-called grease lip, and its tip is in contact with the outer peripheral surface portion of the step portion 3h formed on the wheel mounting flange 3c. In this way, the outer side seal member 9 prevents intrusion of dust or the like or leakage of grease.

  In the wheel bearing device 1 configured as described above, the hub wheel 3 and the inner ring 4 are rotatably supported by the outer ring 2 via the inner tapered roller 5a and the outer tapered roller 5b. In the wheel bearing device 1, the gap between the inner side opening 2 a of the outer ring 2 and the inner ring 4 is closed by the inner side seal member 6, and the gap between the outer side end of the outer ring 2 and the hub ring 3 is closed to the outer ring 2. The side seal member 9 is closed. As a result, the wheel bearing device 1 is configured such that the hub wheel 3 and the inner ring 4 supported by the outer ring 2 can rotate while preventing leakage of grease from the inside and entry of rainwater or dust from the outside. ing.

  The wheel bearing device 1 according to the first embodiment includes an annular flange surface 21 in which the flange portion 20 faces the large end surface 5b1 of the tapered roller 5b on the outer side, and a radial direction from the radially inner periphery of the flange surface 21. It has the built-up part 24 which protrudes inside. Thus, in the wheel bearing device 1, instead of directly extending in the axial direction from the radially inner peripheral edge of the flange surface as in the conventional flange portion (see FIG. 5), the flange portion is not formed. A built-up portion 24 that protrudes radially inward from the radially inner periphery of the surface 21 is provided. The built-up portion 24 protrudes radially inward from the flange portion 40 so as to face the thin portion 5b2 of the large end surface 5b1. The position of the tip of the built-up portion 24 is set by the amount of movement of the cage 12 in the radial direction. In the present embodiment, the tip of the built-up portion 24 is located on the outer diameter side from the center of the dimension connecting the center O and the outer edge of the fillet 5b in order to avoid interference with the cage 12. Note that the shading 5b2 does not face the flange portion 20 in the axial direction.

  By providing the built-up portion 24 protruding radially inward from the flange portion 20, the thickness in the vicinity of the outer raceway surface 2d increases, and the annular outer ring 2 is deformed so as to be flattened. It can be suppressed. That is, the ring rigidity of the flange portion 20 is improved, and even when an axial force is partially applied to the outer ring 2 at the time of knuckle fastening, the deformation can be suppressed and the roundness deterioration of the flange portion 20 can be prevented. . As a result, it is possible to prevent adverse effects such as a reduction in bearing life due to deterioration in roundness and seizure due to a change in the contact state of an operating part such as a tapered roller. Further, by providing the built-up portion 24 on the inner peripheral surface side of the outer ring 2, the ring rigidity can be improved without increasing the outer diameter of the outer ring 2. As a result, since the outer diameter of the outer ring 2 is not changed, the design change of the seal member or the like is not required, and the design change on the vehicle side is not required.

  Further, the built-up portion 24 protrudes from the flange portion 20 so as to face the fillet 5b2 formed on the large end surface 5b1 of the tapered roller 5b. Thereby, the ring rigidity of the said collar part 20 can also be improved, ensuring the area of the collar surface 21 of the collar part 20 required in order to guide the large end surface 5b1 of the tapered roller 5b.

  Further, in the wheel bearing device 1, the tapered surface 22 of the built-up portion 24 is continuously provided from the flange surface 21 and is formed so as to be separated from the outer tapered roller 5 b. As a result, the build-up portion 24 and the flange surface 21 are connected in a relatively smooth manner rather than in a stepped shape, thereby reducing the stress concentration (stress distribution), and the outer raceway surface close to the flange portion 20. The ring rigidity of 2d can be further improved.

  The predetermined angle θ1 is preferably set to 45 ° or more. The predetermined angle θ1 is preferably smaller than an inclination angle with respect to the axial direction of the flange surface 21. Thus, by setting the predetermined angle θ1 to 45 ° or more, the predetermined angle θ1 is set to the axial direction of the flange surface 21 while ensuring the thickness of the built-up portion 24 on the side close to the outer raceway surface 2d in the flange portion 20. By making the angle smaller than the inclination angle, the tapered surface 22 can be prevented from coming into contact with the large end surface 5b1 of the outer tapered roller 5b, and the ring rigidity of the outer raceway surface 2d of the outer ring 2 can be further improved.

Next, referring to FIG. 4, a wheel bearing in which a flange 40 is formed instead of the flange 20 of the wheel bearing device 1 according to the first embodiment as a wheel bearing device according to the second embodiment. The device 1A will be described.
The wheel bearing device 1 according to the first embodiment and the wheel bearing device 1A according to the second embodiment are different only in the configuration of the collar portion, and the other components are denoted by the same reference numerals, Description is omitted.

  As shown in FIG. 4, the outer ring 2 is formed with a flange 40 projecting radially inward on the inner peripheral surface of the outer side end. The flange 40 is provided adjacent to the large-diameter side end of the outer raceway surface 2d. The flange portion 40 has a build-up portion 41 having a length dimension L1 in the axial direction and a step portion having an inner diameter dimension larger than that of the build-up portion 41 and having a length dimension L2 in the axial direction. 42. The built-up portion 41 faces the large end surface 5b1 of the tapered roller 5b.

  The built-up portion 41 includes an annular flange surface 21 that receives and guides the large end surface 5 b 1 of the tapered roller 5 b, a tapered surface 22 that is connected to the radially inner periphery of the flange surface 21, and the radial direction of the taper portion 22. And a circumferential surface portion 23 parallel to the axial direction provided continuously to the inner peripheral edge. The built-up portion 41 protrudes at a radially inner portion (light ink portion in FIG. 4) from the radially inner peripheral edge of the flange surface 21. That is, the built-up portion 41 includes an annular flange surface 21 that faces the large end surface 5b1 of the outer tapered roller 5b, and a tapered surface 22 that is connected to the radially inner peripheral edge of the flange surface 21. The tapered surface 22 is formed to be inclined at a predetermined angle θ2 with respect to the axial direction. Concave-curved thin portions 30 are formed along the circumferential direction at the corners between the radially outer peripheral edge of the flange surface 21 and the large-diameter side end of the inner raceway surface 3e on the outer side.

  That is, the flange portion 40 is formed with an inner diameter dimension smaller than the inner diameter dimension of the radially inner periphery of the flange surface 21 between the axial direction from the radially inner periphery of the flange surface 21 to the outer side end of the outer ring 2. The part 41 and the step part 42 provided in a row by the outer side of the build-up part 41 are provided. In the present embodiment, the built-up portion 41 projects radially inward from the inner side edge of the inner peripheral surface of the collar portion 40 within a range slightly outside the axial center. The built-up portion 41 overlaps with the cage 12 when viewed from the radial direction. On the other hand, the step portion 42 does not overlap the cage 12 when viewed from the radial direction. The step portion 42 includes an inner peripheral surface 40 a of the flange portion 40 and an outer side surface 25 that extends radially outward from the outer edge of the circumferential surface 23 of the built-up portion 41. In the present embodiment, the axial dimension L1 of the built-up portion 40 is larger than the axial dimension L2 of the stepped portion 42. Thereby, in addition to the effect similar to the effect by the collar part 20 of 1st embodiment, the built-up part 41 and the step part 42 of predetermined length are formed in the axial direction only in the required part, and the weight increase of a bearing is carried out. The configuration can be suppressed. Further, the flange portion 40 effectively forms the built-up portion 41 by setting the side close to the outer raceway surface 2d of the outer ring 2 as a built-up portion 41 and the outer side opening portion side of the outer ring 2 as a stepped portion 42. It is arranged so that the influence on the ring rigidity of the outer raceway surface 2d of the outer ring 2 is reduced.

  The predetermined angle θ2 is set to be smaller than an inclination angle with respect to the axial direction of the flange surface 21. The predetermined angle θ2 is preferably set to 45 ° or more. Thus, by setting the predetermined angle θ2 to 45 ° or more, the predetermined angle θ2 is set to the axial direction of the flange surface 21 while ensuring the thickness of the built-up portion 41 on the side close to the outer raceway surface 2d in the flange portion 20. By making the angle smaller than the inclination angle, the tapered surface 22 can be prevented from coming into contact with the large end surface 5b1 of the outer tapered roller 5b, and the ring rigidity of the outer raceway surface 2d of the outer ring 2 can be further improved.

  Further, when the length dimension L1 of the built-up portion 41 is increased, the ring rigidity of the outer raceway surface 2d of the outer ring 2 can be improved. On the other hand, when the length dimension L2 of the stepped portion 42 is increased, an increase in the weight of the bearing can be suppressed. Therefore, the length dimension L1 of the built-up portion 41 and the length dimension L2 of the stepped portion 42 can be appropriately adjusted and set according to the desired effect. For example, it is preferable to set the axial length L1 of the built-up portion 41 to 3 mm or more. Thereby, the ring rigidity of the outer raceway surface 2d of the outer ring 2 can be ensured.

  The wheel bearing device 1 disclosed in the present specification can be applied not only to a driving wheel to which a universal joint is connected, but also to a wheel bearing device for a driven wheel.

  Finally, the invention in the present application is not limited to each embodiment, but is merely an example, and it goes without saying that the invention can be implemented in various forms without departing from the gist of the present invention. The scope of the invention is indicated by the description of the scope of claims, and further includes equivalent meanings of the scope of claims and all modifications within the scope.

1, 1A Wheel bearing device 2 Outer ring (outer member)
2c Inner-side outer raceway surface 2d Outer-side outer raceway surface 3 Hub wheel 3e Outer-side inner raceway surface 4 Inner ring 5a Inner-side tapered roller 5b Outer-side tapered roller 5b1 Large end surface 20, 40 Hook 21 Tail surface 22 Tapered surface 24, 41 Overlay

Claims (4)

An outer member having a double row outer raceway surface;
An inner member having a hub ring and an inner ring fitted to the hub ring, and having an inner raceway surface facing an outer raceway surface of the double row on an outer periphery;
A double row tapered roller housed in a freely rollable manner between the respective raceway surfaces of the outer member and the inner member;
In the wheel bearing device having a flange surface protruding radially inward on the outer side of the inner peripheral surface of the outer member, the flange portion having a flange surface that contacts the large end surface of the tapered roller,
The wheel bearing device according to claim 1, wherein the outer member is provided with a built-up portion that protrudes radially inward from the flange portion. On the large end surface of the tapered roller, a thinning is provided,
2. The wheel bearing device according to claim 1, wherein the build-up portion protrudes from the flange portion so as to face the thinning. The build-up part is
It is formed between the axial direction from the radially inner peripheral edge of the flange surface to the outer side end of the outer member,
The wheel bearing device according to claim 1, wherein a step portion is provided between the build-up portion and an outer side end of the outer member. The build-up part is
4. The wheel bearing device according to claim 1, further comprising a tapered surface that is provided continuously from the flange surface and is spaced apart from the tapered roller toward the outer side. 5.

Images