JP2010047092A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel which makes bearing rigidity at a drive wheel side and at a driven wheel side identical, and reduces cost by standardizing parts. <P>SOLUTION: In the bearing device for the wheel at the driven wheel side, a cone-shaped recessed part 14 is formed on the end of an outer side of a hub ring 4, and an inner ring 5 is axially fixed in such a state that a predetermined pressure is given on the bearing device in advance by a caulking part 7 formed by plastic deformation of the end of a small diameter step part 4b of the hub ring 4 outward in a radial direction. The size and number of rolling elements 3, a pitch circle diameter PCD, a rolling element pitch P, and an outward member 2 are set identically to those of the bearing device for the wheel at the drive wheel side. The shape of a wheel mounting flange 6 of the hub ring 4 is set to be substantially identical to that of the hub ring at the drive wheel side in which a serration for transmitting torque is internally formed. The amount of preload is set to be identical to that of the bearing device for the wheel at the drive wheel side in a vehicle mounting state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like with respect to a suspension device, and in particular, the bearing rigidity on the driving wheel side and the driven wheel side is made the same, and the parts are made common and low. The present invention relates to a wheel bearing device that achieves cost reduction.

  2. Description of the Related Art Wheel bearing devices for vehicles such as automobiles are such that wheels are rotatably supported via a double row rolling bearing with respect to a suspension device, and there are ones on the driving wheel side and those on the driven wheel side. When the same vehicle has 2WD (front wheel drive or rear wheel drive) or 4WD (all wheel drive) specifications, generally, there are some common parts such as knuckles and suspensions. As a typical example of the conventional structure, a wheel bearing device for a driven wheel as shown in FIG. 3 is known. 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. 3), and the side closer to the center is referred to as the inner side (right side in FIG. 3).

  This wheel bearing device is called the third generation for driven wheels, and is provided with an inner member 53 comprising a hub wheel 51 and an inner ring 52, and extrapolated to the inner member 53 via double rows of balls 54, 54. The outer member 55 is provided. The hub wheel 51 integrally has a wheel mounting flange 56 for attaching a wheel (not shown) to an end portion on the outer side, an outer side inner rolling surface 51a on the outer periphery, and the inner side rolling surface 51a. A small diameter step 51b extending in the axial direction is formed. Further, hub bolts 56 a for fixing the wheels are planted at the circumferentially equidistant positions of the wheel mounting flanges 56.

  An inner ring 52 having an inner side inner rolling surface 52a formed on the outer periphery thereof is press-fitted into the small diameter step portion 51b of the hub wheel 51. The inner ring 52 is prevented from coming off from the hub wheel 51 in the axial direction by a caulking portion 51c formed by plastically deforming the end portion of the small diameter step portion 51b of the hub wheel 51 radially outward. .

  The outer member 55 integrally has a vehicle body mounting flange 55b to be attached to the knuckle 57 on the outer periphery, and double row outer rolling surfaces 55a, 55a are integrally formed on the inner periphery. Double rows of balls 54 and 54 are slidably accommodated between the double row outer raceway surfaces 55a and 55a and the inner raceway surfaces 51a and 52a facing them.

  Seals 58 and 59 are attached to the opening portion of the annular space formed between the inner member 53 and the outer member 55, and leakage of lubricating grease sealed inside the bearing, rainwater, dust, etc. from the outside. It prevents entry into the bearing.

  A through hole 57a is formed in the knuckle 57 in a substantially vertical direction, and a vehicle speed sensor 60 is inserted into the through hole 57a. The inner side seal 59 is composed of a pack seal, and includes a slinger 61 press-fitted into the outer diameter of the inner ring 52. A magnetic encoder 62 is joined to the side surface of the slinger 61 and is opposed to the vehicle speed sensor 60 via a predetermined air gap.

  A baffle plate 63 is press-fitted and fixed to the outer diameter of the inner ring 52. The baffle plate 63 has a substantially L-shaped cross section, and is arranged on the inner periphery of the knuckle 57 with a minute gap therebetween, thereby blocking the passage of foreign matters such as muddy water and pebbles.

Here, the position and shape of the baffle plate 63 with respect to the magnetic encoder 62 are substantially the same as the baffle plate (not shown) in the wheel bearing device on the drive wheel side. Thereby, for example, components such as the outer member 55, the knuckle 57, the seals 58 and 59, and the vehicle speed sensor 60 can be shared, and the number of parts can be reduced while reducing the development man-hour (for example, , See Patent Document 1).
JP 2007-162831 A

  In recent years, as described above, in such a wheel bearing device, not only the component parts are shared and the cost is reduced, but also the bearing rigidity on the driven wheel side and the driving wheel side has the same specification due to the characteristics of the vehicle. The design which becomes is demanded. However, in the wheel bearing device on the drive wheel side, in order to connect the drive shaft (not shown), for example, it is necessary to form a serration for torque transmission on the inner periphery of the hub wheel 51. On the other hand, in the wheel bearing device on the driven wheel side, this drive shaft is no longer necessary, and it is currently developed, designed and manufactured as a separate part with a different specification from the drive wheel side. This increases the number of man-hours due to individual development and design, and also increases the number of management / assembly man-hours due to an increase in the number of parts, which hinders cost reduction.

  The present invention has been made in view of such a conventional problem. The wheel bearing has achieved the same cost as the bearing rigidity of the driving wheel side and the driven wheel side, and the common use of parts to reduce the cost. An object is to provide an apparatus.

  In order to achieve such an object, the invention described in claim 1 of the present invention has a vehicle body mounting flange integrally attached to the vehicle body on the outer periphery, and a double row outer rolling surface is integrated on the inner periphery. The formed outer member, a wheel mounting flange for mounting the wheel at one end, and an inner rolling surface facing one of the double-row outer rolling surfaces on the outer periphery, and the inner rolling A hub wheel having a small-diameter step portion extending in the axial direction from the surface through the shaft-shaped portion, and an inner side that is press-fitted into the small-diameter step portion of the hub wheel and faces the other outer surface of the double row on the outer periphery An inner member formed of an inner ring formed with a rolling surface, and a double row rolling element accommodated between the inner member and the outer member via the cage between the rolling surfaces of the inner member and the outer member. A seal attached to an opening of an annular space formed between the outer member and the inner member, In the wheel bearing device on the driven wheel side in which a mortar-shaped recess is formed at the outer end of the hub wheel, the size, number, pitch circle diameter, rolling element pitch, and outer member of the rolling element are driven. It is set to the same specifications as the wheel bearing device on the wheel side, and the shape of the wheel mounting flange of the hub wheel is substantially the same as the hub wheel on the driving wheel side in which serrations for torque transmission are formed on the inner periphery. They are set the same.

  Thus, in the wheel bearing device on the driven wheel side in which a mortar-shaped recess is formed at the outer end of the hub wheel, the size, number, pitch circle diameter, rolling element pitch, and outer member of the rolling element are It is set to the same specifications as the wheel bearing device on the drive wheel side, and the shape of the wheel mounting flange of the hub wheel is substantially the same as the hub wheel on the drive wheel side in which serrations for torque transmission are formed on the inner periphery. Since they are set to be the same, the bearing rigidity on the driven wheel side and the bearing rigidity on the driving wheel side are substantially equal, and a wheel bearing device having substantially the same specifications can be provided in terms of the characteristics of the vehicle. In addition to reducing man-hours for development and design, it is possible to achieve cost reduction by standardizing parts.

  Preferably, as in the invention described in claim 2, the wheel mounting flange of the hub wheel is formed thin, and a rib extending radially is formed on the inner side surface of the wheel mounting flange by forging. If so, weight reduction can be achieved while securing rigidity.

  Further, as in the invention described in claim 3, the thickness of the wheel mounting flange may be set to the same dimension as the wheel mounting flange of the hub wheel on the drive wheel side.

  Further, as in the invention described in claim 4, the outer diameter and the minimum thickness of the base portion on the inner side of the wheel mounting flange are set to the same dimensions as the wheel mounting flange of the hub wheel on the drive wheel side. Also good.

  Further, as in the invention described in claim 5, the dimension of the shaft-like portion may be set to be the same as that of the hub wheel on the drive wheel side.

  Further, as in the invention described in claim 6, in a state where a predetermined bearing preload is applied by a caulking portion formed by plastically deforming an end portion of the small diameter step portion of the hub wheel radially outward. If the inner ring is fixed in the axial direction and the preload amount is set to be the same as that of the wheel bearing device on the driving wheel side in a vehicle mounted state, the bearing rigidity on the driven wheel side and the driving wheel side is substantially reduced. Thus, a wheel bearing device having substantially the same specifications in terms of the characteristics of the vehicle can be provided.

  The wheel bearing device according to the present invention has an outer member integrally formed with a vehicle body mounting flange for mounting to the vehicle body on the outer periphery, and an outer member formed integrally with a double row outer rolling surface on the inner periphery, and one end portion. A wheel mounting flange for mounting a wheel on the inner side, and an inner rolling surface facing one of the double-row outer rolling surfaces on the outer periphery, and an axial direction from the inner rolling surface via a shaft portion A hub ring formed with a small-diameter step portion extending to the inner ring, and an inner ring press-fitted into the small-diameter step portion of the hub ring and having an inner rolling surface facing the other of the double-row outer rolling surfaces on the outer periphery. An inner member, a double-row rolling element accommodated between the rolling surfaces of the inner member and the outer member via a cage, and the outer member and the inner member. And an end portion on the outer side of the hub wheel, the seal mounted on the opening of the annular space formed between In the wheel bearing device on the driven wheel side in which a mortar-shaped recess is formed, the size, the number, the pitch circle diameter, the rolling element pitch, and the outer member of the rolling element are the same specifications as the wheel bearing device on the driving wheel side. And the shape of the wheel mounting flange of the hub wheel is set to be substantially the same as that of the hub wheel on the driving wheel side in which serration for torque transmission is formed on the inner periphery. The bearing rigidity on the drive side and the bearing rigidity on the drive wheel side are substantially the same, and it is possible to provide a wheel bearing device having substantially the same specifications due to the characteristics of the vehicle, reducing the man-hours for development and design. The cost can be reduced by standardizing parts.

  A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount a wheel on one end A hub wheel integrally formed and having an inner rolling surface facing one of the outer rolling surfaces 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 the hub wheel An inner member comprising an inner ring that is press-fitted into a small-diameter step portion and has an outer race formed with an inner race surface facing the other of the outer row raceways in the double row, and both the inner member and the outer member. A double-row rolling element accommodated between the rolling surfaces via a cage, and a seal attached to an opening of an annular space formed between the outer member and the inner member; A mortar-shaped recess is formed at the outer end of the hub wheel, and the hub A wheel bearing on the driven wheel side in which the inner ring is fixed in the axial direction in a state where a predetermined bearing preload is applied by a caulking portion formed by plastically deforming an end portion of the small diameter step portion radially outward. In the device, the size, number, pitch circle diameter, rolling element pitch, and outer member of the rolling elements are set to the same specifications as the wheel bearing device on the driving wheel side, and the shape of the wheel mounting flange of the hub wheel is It is set to be substantially the same as the hub wheel on the drive wheel side in which the serration for torque transmission is formed on the inner periphery, and the preload amount is the same as the wheel bearing device on the drive wheel side in the vehicle mounted state. Is set to

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device for a driven wheel according to the present invention, and FIG. 2 is a longitudinal sectional view showing a wheel bearing device for a driving wheel which is a reference example of the present invention. It is. 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 has a third generation structure on the driven wheel side, and is a double row rolling element (ball) accommodated between the inner member 1 and the outer member 2 and between the members 1 and 2 so as to be freely rollable. 3 and 3. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4 through a predetermined shimiro.

  The hub wheel 4 integrally has a wheel mounting flange 6 for attaching a wheel (not shown) to an end portion on the outer side, and a hub bolt for fixing the wheel at a circumferentially equidistant position of the wheel mounting flange 6. 6a is planted. Further, one (outer side) inner rolling surface 4a and a small-diameter step portion 4b extending in the axial direction from the inner rolling surface 4a via the shaft-shaped portion 4c are formed on the outer periphery of the hub wheel 4. Furthermore, a mortar-shaped recess 14 is formed at the end on the outer side by forging, thereby reducing the weight.

  The inner ring 5 is formed with the other (inner side) inner rolling surface 5a on the outer periphery, and is press-fitted into the small-diameter step portion 4b with the small end surface (front side end surface) 5b abutting against the shoulder 4d of the hub wheel 4. Has been. The inner ring 5 is fixed in the axial direction in a state where a predetermined bearing preload is applied by a caulking portion 7 formed by plastically deforming an end portion of the small-diameter stepped portion 4b of the hub wheel 4 radially outward. ing.

  The outer member 2 integrally has a vehicle body mounting flange 2b for mounting to a knuckle (not shown) on the outer periphery, and has a double row facing the inner rolling surfaces 4a and 5a of the inner member 1 on the inner periphery. The outer rolling surfaces 2a and 2a are integrally formed. And the double-row rolling elements 3 and 3 are accommodated between each rolling surface 2a, 4a and 2a, 5a, and these double-row rolling elements 3 and 3 are rollably hold | maintained with the holder | retainers 8 and 8. ing.

  Further, seals 9 and 10 are attached to the opening portion of the annular space formed between the outer member 2 and the inner member 1, and leakage of lubricating grease sealed inside the bearing and rainwater and dust from the outside. Etc. are prevented from entering the inside of the bearing. In addition, although the double row angular contact ball bearing which used the rolling element 3 as a ball | bowl was illustrated here, it is not restricted to this, The double row tapered roller bearing which uses a tapered roller for a rolling element may be sufficient.

  The hub wheel 4 is made of medium and high carbon steel containing carbon of 0.40 to 0.80% by weight, such as S53C, and is mounted on a wheel that serves as a seal land portion of the outer side seal 9 including the inner side rolling surface 4a on the outer side. The surface hardness of the flange 6 is hardened to a range of 58 to 64 HRC by induction hardening from the base 6b on the inner side to the small diameter step 4b. The caulking portion 7 is an unquenched portion of the material surface hardness after forging.

  On the other hand, the inner ring 5 and the rolling element 3 are made of a high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core portion by quenching. Similarly to the hub wheel 4, the outer member 2 is made of medium and high carbon steel containing carbon of 0.40 to 0.80% by weight such as S53C, and at least the double row outer rolling surfaces 2a and 2a have high frequency. The surface hardness is hardened by quenching to a range of 58 to 64 HRC.

  FIG. 2 is a longitudinal sectional view showing a wheel bearing device on the drive wheel side which is a reference example of the present invention. It should be noted that the same parts as those in the embodiment on the driven wheel side described above or parts or parts having similar functions are denoted by the same reference numerals and detailed description thereof is omitted. This wheel bearing device includes an inner member 11, an outer member 2, and double-row rolling elements 3 and 3 accommodated between the members 1 and 2 so as to be freely rollable. The inner member 11 includes a hub ring 12 and an inner ring 13 press-fitted into the hub ring 12 through a predetermined shimiro.

  The hub wheel 12 integrally has a wheel mounting flange 6 at an end portion on the outer side, an inner rolling surface 12a on the outer periphery, and an axial direction from the inner rolling surface 12a via a cylindrical shaft portion 12b. An extending cylindrical small diameter step 4b is formed. The inner ring 13 is formed with an inner rolling surface 13a on the outer periphery, and is press-fitted and fixed to the small-diameter step portion 4b with the small end surface 5b abutting against the shoulder portion 4d of the hub wheel 12.

  The hub wheel 12 is made of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the small diameter step starts from the inner side rolling surface 12a on the outer side and the base 6b on the inner side of the wheel mounting flange 6. The surface hardness is set to a range of 58 to 64 HRC by induction hardening over the portion 4b. On the other hand, the inner ring 13 is made of 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.

  Here, in the present embodiment, the wheel mounting flange 6 of the hub wheel 4 is formed thin to reduce the weight, and the rib 6c extending in the radial direction is forged at a portion where the hub bolt 6a is fixed in order to increase rigidity. It is formed by processing. When the brake type on the driven wheel side and the driving wheel side are different types, that is, the outer diameter of the outer member 2 and the wheel mounting flange 6 and the vehicle body so that there is no interference regardless of whether the disc brake or the drum brake is mounted. A distance from the mounting flange 2b is set. As a result, the outer member 2 can be shared at least on the driven wheel side and the drive wheel side.

  The size, number, rolling circle diameter PCD, and rolling element pitch P of the rolling elements 3 are, of course, the wheel mounting flange 6 of the hub wheel 4 on the driven wheel side and the wheel mounting flange of the hub wheel 12 on the driving wheel side. The shape of 6 is set to be substantially the same. That is, the thickness of the wheel mounting flange 6 and the outer diameter and the minimum thickness of the base portion 6b are set to be the same (a1 = a2, b1 = b2, c1 = c2, φd1 = φd2, e1 = e2). Further, the outer diameters of the shaft-shaped portion 4c of the hub wheel 4 and the small-diameter portion 5c of the inner ring 5 on the driven wheel side, and the shaft-shaped portion 12b of the hub wheel 12 and the small-diameter portion 13c of the inner ring 13 on the driving wheel side are set to be the same. (F1 = f2, g1 = g2).

  Further, in the vehicle mounted state, the inner ring 5 and the inner ring 5 and the inner ring of the hub ring 4 and 12 are pressed so that the bearing preload on the driven wheel side and the bearing preload on the drive wheel side are equal to each other. The shape and groove positional relationship of the rolling surfaces 4a and 12a and the inner rolling surfaces 5a and 13a of the inner rings 5 and 13 are adjusted, the clearance of the bearing unit is set to be the same, and the inner rings 5 and 13 are fixed. The axial force is set to be substantially the same. That is, in the wheel bearing device on the driven wheel side, the inner ring pressing force when the caulking portion 7 is formed, and in the wheel bearing device on the drive wheel side, the hub wheel 12 and the constant velocity universal joint (not shown). Is set so that the fastening force of the fixing nut is the same.

  As a result, the bearing rigidity on the driven wheel side and the bearing rigidity on the driving wheel side are substantially equal, and a wheel bearing device having substantially the same specifications can be provided due to the characteristics of the vehicle. The number of man-hours can be reduced, and the cost can be reduced by standardizing by common parts.

  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.

  In the wheel bearing device according to the present invention, an inner rolling surface and a small-diameter step portion extending in the axial direction from the inner rolling surface are formed on the outer periphery of the hub wheel, and the inner ring is press-fitted into the small-diameter step portion. Applicable to 3rd generation wheel bearing devices.

It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. It is a longitudinal cross-sectional view which shows the wheel bearing apparatus by the side of the drive wheel which is a reference example of this invention. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

Explanation of symbols

1, 11 ... Inner member 2 ... Outer member 2a ... Outer side Rolling surface 2b ..... Body mounting flange 3 ..... Rolling elements 4, 12 ...・ Hub wheels 4a, 5a, 12a, 13a .. Inner rolling surface 4b... Small diameter step 4c, 12b.・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulders 5, 13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 5b ・ ・ ・ ・ ・ ・ ・ ・ Small end faces 5c, 13c ・ ・.... Small diameter part 6 of the inner ring ..... Wheel mounting flange 6a ..... Hub bolt 6b ... .... Base 6c on the inner side of the wheel mounting flange ...・ ・ ・ Rib 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping part 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 9, 10 ・ ・ ・ ・ ・ ・ ・ ・... Seal 14 ... Recess 51 ... Hub wheels 51a, 52a ... Inner rolling surface 51b ··········· Small diameter step 51c ············································・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 54 ・ ・ ・ ・ ・ ・ ・ ・ Ball 55 ・ ・ ・ ・ ・ ・ ・ ・ Outer member 55a ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 55b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 56 ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 56a ・ ・ ・..... hub bolt 57 ..... knuckle 57a・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Through hole 58, 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 60 ・ ・ ・ ・ ・ ・ ・ ・ Vehicle speed sensor 61 ・ ・ ・ ・ ・ ・.... Slinger 62 ... Magnetic encoder 63 ... Baffle plates a1, a2, b1, b2 ...・ Wheel mounting flange thicknesses c1, c2 ... Rib thicknesses d1, d2 ... Outer diameters of bases e1, e2 ...・ ・ ・ ・ Minimum thickness f1, f2 of the base part ...... Outer diameters g1, g2 of the shaft-like part .... Outer diameter of the small diameter part of the inner ring

Claims (6)

An outer member integrally having a vehicle body mounting flange for being attached to the vehicle body on the outer periphery, and an outer rolling surface of a double row integrally formed on the inner periphery;
A wheel mounting flange for mounting a wheel at one end is integrally formed, an inner rolling surface facing one of the double-row outer rolling surfaces on the outer periphery, and an axial portion from the inner rolling surface via A hub wheel formed with a small-diameter step portion extending in the axial direction, and an inner ring press-fitted into the small-diameter step portion of the hub wheel and formed with an inner rolling surface facing the other of the outer rolling surfaces of the double row on the outer periphery An inner member consisting of
A double row rolling element housed in a freely rollable manner between the rolling surfaces of the inner member and the outer member via a cage;
A seal attached to an opening of an annular space formed between the outer member and the inner member;
In the wheel bearing device on the driven wheel side in which a mortar-shaped recess is formed at the outer end of the hub wheel,
The size, number, rolling circle pitch, rolling element pitch and outer member of the rolling elements are set to the same specifications as the wheel bearing device on the drive wheel side, and the shape of the wheel mounting flange of the hub wheel A wheel bearing device, characterized in that the wheel bearing device is set substantially the same as a hub wheel on the side of the driving wheel in which a serration for torque transmission is formed on the periphery.   The wheel bearing device according to claim 1, wherein a wheel mounting flange of the hub wheel is formed to be thin, and a rib extending in a radial direction is formed on a side surface on the inner side of the wheel mounting flange by forging.   The wheel bearing device according to claim 1 or 2, wherein a wall thickness of the wheel mounting flange is set to be the same as a wheel mounting flange of the hub wheel on the drive wheel side.   The wheel bearing according to any one of claims 1 to 3, wherein an outer diameter and a minimum thickness of a base portion on an inner side of the wheel mounting flange are set to the same dimensions as a wheel mounting flange of a hub wheel on the driving wheel side. apparatus.   The wheel bearing device according to any one of claims 1 to 4, wherein a dimension of the shaft-like portion is set to be the same as that of the hub wheel on the drive wheel side.   The inner ring is fixed in the axial direction in a state where a predetermined bearing preload is applied by a crimping portion formed by plastically deforming an end portion of the small-diameter step portion of the hub ring radially outward, and the preload amount The wheel bearing device according to any one of claims 1 to 5, wherein the wheel bearing device is set to be the same as the wheel bearing device on the drive wheel side in a vehicle-mounted state.

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