JP2008162322A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel allowing reduction of weight and reduction of cost by reducing material loss. <P>SOLUTION: In this bearing device, a hub wheel 1 having a wheel mounting flange 6 at one end part has a brake pilot part 13 extending from a base part of the wheel mounting flange 6 to an outer side to guide an inner diameter surface of a brake rotor, and a wheel pilot part 14 further extending from the brake pilot part 13 to the outer side to guide an inner diameter surface of the wheel. At least the wheel pilot part 14 is constituted of a plurality of divided pilots 15 divided equally in the peripheral direction. Chamfering parts 16 are formed by forging at peripheral direction end parts of the divided pilots 15. Each of the chamfering parts 16 is provided with an inclined angle α≤30° relative to a tangential line direction of a pilot circle P/C after turning, and thereby a process for removing cutting burrs of the divided pilots 15 becomes unnecessary in the turning to reduce cost. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention 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 more particularly to a wheel bearing device that achieves weight reduction by reducing material loss and reducing costs. It is.

  In recent years, demands for improving fuel efficiency have been severe from the viewpoint of resource saving or pollution. In automobile parts, weight reduction of wheel bearing devices has been attracting attention as a factor to meet such demand, and has been strongly desired for a long time. In particular, among vehicles such as automobiles, light vehicles such as light four-wheel vehicles or small cars are not only cost-reduced, but demands for this weight reduction are increasing. There are various proposals related to wheel bearing devices that have been made lighter in the past. However, in the wheel bearing device that supports the wheel in a freely rotatable manner, reliability and durability contradicting this weight reduction in one aspect. Improving the performance is also an important factor.

  FIG. 5 shows an example of a wheel bearing device that is used in an automobile and is reduced in weight. The wheel bearing device 52 has a typical structure used on the driven wheel side, and includes an inner member 53 and an outer member 54 each including a hub wheel 51 and an inner ring 60 press-fitted into the hub wheel 51. A double-row ball 55, 55 accommodated between the members 53, 54 so as to roll freely is provided. 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).

  The hub wheel 51 integrally has a wheel mounting flange 56 (hereinafter referred to as a wheel mounting arm) that is divided into four radially extending at one end portion on the outer side. A hub bolt 56a for fastening a wheel is implanted in the wheel. As shown in FIG. 6, the wheel mounting arm 56 is cut out at a portion other than the vicinity of the hub bolt insertion hole 56 b, and has a width substantially the same as the formation portion of each hub bolt insertion hole 56 b, and protrudes radially from the brake pilot portion 64. It is formed as follows.

  Further, as shown in FIG. 5, ribs 56 c are formed on the inner side surface of the wheel mounting arm 56 so as to gradually increase in thickness toward the base portion. Further, on the outer periphery of the hub wheel 51, an inner side rolling surface 51a on the outer side and a small-diameter step portion 57 extending in the axial direction from the inner rolling surface 51a are formed. It is press-fitted through. The inner ring 60 has an inner side inner rolling surface 60a formed on the outer periphery, and is fixed in the axial direction by a caulking portion 58 formed by plastically deforming the end of the small-diameter stepped portion 57 of the hub wheel 51 radially outward. Has been.

  On the other hand, double row outer rolling surfaces 54a and 54a are integrally formed on the inner periphery of the outer member 54, and the inner side of the double row of the inner members 53 facing the double row outer rolling surfaces 54a and 54a. Double-row balls 55 and 55 are accommodated between the rolling surfaces 51 a and 60 a, and are held by a retainer 59 so as to roll freely.

  A seal 61 is attached to the outer end of the outer member 54, and the annular space between the outer member 54 and the inner member 53 is sealed. Further, a cup-shaped seal cap (not shown) is attached to the inner end of the outer member 54, and the opening of the outer member 54 is closed. The seal 61 and the seal cap prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like from the outside into the bearing.

  Further, the outer member 54 integrally has a vehicle body mounting flange 54b attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and a plurality of bolt insertion holes 62 are formed on the outer periphery of the vehicle body mounting flange 54b. It has been drilled. As shown in FIG. 6, the vehicle body mounting flange 54 b is cut out of the outer peripheral portion except for the vicinity of the bolt insertion holes 62, and only the portions where the bolt insertion holes 62 are formed project radially to the outer diameter side. The shape is divided into a plurality of partial flanges 63 separated in the circumferential direction. A cylindrical knuckle pilot portion 54c extending in the axial direction from the vehicle body mounting flange 54b is formed at the inner end of the outer member 54, and the knuckle is fitted to the outer diameter surface of the knuckle pilot portion 54c. The

  Here, a cylindrical brake pilot portion 64 extending outward is formed at the base portion of the wheel mounting arm 56 of the hub wheel 51, and guides the inner diameter surface of the brake rotor 65. Further, a wheel pilot portion 66 is formed extending further from the brake pilot portion 64 to the outer side. The wheel pilot portion 66 guides the inner diameter surface of a wheel (wheel) 67 mounted on the brake rotor 65 and is formed to have a slightly smaller diameter than the brake pilot portion 64.

In addition, notches are provided at a plurality of locations in the circumferential direction of the wheel pilot portion 66 and are intermittently formed in a protruding piece shape. Here, the intermittent wheel pilot portion 66 is formed at a circumferentially equidistant position between adjacent wheel mounting arms 56. As a result, the weight of the hub wheel 51 can be reduced, and the annular base portion of the wheel mounting arm 56 has a relatively uniform wall thickness in the circumferential direction. Becomes easier and forging processability is improved. Therefore, the forging accuracy is improved, the productivity is increased, and the cost can be reduced.
JP 2005-297925 A

  However, the hub wheel 51 of such a conventional wheel bearing device is provided with notches at a plurality of locations in the circumferential direction of the wheel pilot portion 66 by forging, and is intermittently formed in a protruding piece shape. Compared with a normal continuous wheel pilot portion, as shown in FIG. 7, turning of the outer peripheral portion 66a after forging (indicated by a broken line in the drawing) is intermittent cutting, and a turning burr 68 at the circumferential end portion. Is likely to occur (indicated by cross-hatching in the figure). When such a turning burr 68 is generated, there is a possibility that a processing accuracy defect due to the biting into the reference surface during processing or a mounting accuracy defect due to the turning burr 68 biting into the mounting surface of the brake rotor 65 or the wheel 67 may occur. . Further, there is a risk of injury by touching the turning burr 68 during work, and an improvement has been desired.

  In order to remove the turning burr 68, deburring (chamfering) may be performed. However, since the wheel pilot portion 66 is divided, it cannot be performed by turning, and each wheel in which the turning burr 68 is generated. The tool must be removed by moving it in the axial direction while pressing the tool against the circumferential end of the pilot portion 66. This complicates the work and greatly increases the number of processing steps, and even if the weight can be reduced by reducing the material, it is not preferable because the manufacturing cost is substantially increased.

  Furthermore, when manufacturing this type of product, it is desired to reduce the weight (material loss) that is removed and discarded by cutting or the like in the machining process from the viewpoint of efficiently using the weight of the raw material that is input. .

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a wheel bearing device that achieves weight reduction by reducing material loss and reducing costs.

  In order to achieve such an object, the invention according to claim 1 of the present invention is such that an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel attached to an end portion on the outer side. And a hub wheel having a small diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small diameter step portion of the hub wheel or the outside of the constant velocity universal joint An inner member formed of a joint member and having a double row inner rolling surface facing the outer row rolling surface of the double row on the outer periphery, and between both rolling surfaces of the inner member and the outer member In a wheel bearing device including a double row rolling element accommodated in a freely rolling manner, a brake pilot portion in which the hub wheel extends from a base portion of the wheel mounting flange to an outer side and guides an inner diameter surface of a brake rotor. , And further from this brake pilot section It has a wheel pilot portion that extends to the outer side and guides the inner diameter surface of the wheel, and at least the wheel pilot portion is composed of a plurality of divided pilots divided in the circumferential direction, and the circumferential direction of the divided pilots A chamfered portion is formed by forging at least an end portion on the turning end side of the end portion, and the chamfered portion has a predetermined inclination angle with respect to the tangential direction of the pilot circle after the turning processing.

  As described above, in the wheel bearing device of the first generation to the fourth generation structure, the hub wheel extends from the base portion of the wheel mounting flange to the outer side and guides the inner diameter surface of the brake rotor, and the brake pilot. A wheel pilot portion that extends further to the outer side and guides the inner diameter surface of the wheel. At least the wheel pilot portion is composed of a plurality of divided pilots divided in the circumferential direction, and Since the chamfered portion is formed by forging at least the end portion on the turning end side in the circumferential end portion, and this chamfered portion has a predetermined inclination angle with respect to the tangential direction of the pilot circle after turning, Reduces weight and removes cutting burrs from the circumferential end of the split pilot when turning the wheel pilot. Degree is not required, the cost can be reduced by the reduction of the cutting removal volume according to the number of steps reduced and turning.

  Preferably, as in the invention described in claim 2, when the inclination angle is set to 30 ° or less, when turning the wheel pilot portion, the crossing angle between the chamfered portion and the pilot circle is reduced, and the cutting burr is generated. It can be prevented from occurring.

  Further, the chamfered portion may be formed in a straight line shape as in the invention described in claim 3, or the chamfered portion is formed in an arc shape as in the invention described in claim 4. May be.

  According to a fifth aspect of the present invention, the brake pilot portion is composed of a plurality of divided pilots divided at equal intervals in the circumferential direction, and at least the turning end side of the circumferential end portions of the divided pilots. If the chamfered portion is formed at the end of the chamfer by forging, and the chamfered portion has a predetermined angle of inclination with respect to the tangential direction of the pilot circle after turning, the weight can be further reduced. In the turning process of the brake pilot part, the process of removing the cutting burr at the circumferential end part of the split pilot is not required, and the cost can be reduced by reducing the number of man-hours and the volume of cutting removal by the turning process.

  The wheel bearing device according to the present invention integrally includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange for mounting the wheel on the outer end. A hub wheel having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub wheel or an outer joint member of a constant velocity universal joint, An inner member in which a double row of inner rolling surfaces facing the outer rolling surface of the inner member is formed, and a double row of the inner member and the outer member that is accommodated so as to roll between the inner and outer rolling surfaces. In the wheel bearing device including a rolling element, the hub wheel extends from a base portion of the wheel mounting flange to an outer side, and guides an inner diameter surface of a brake rotor, and further from the brake pilot portion to an outer side Of the wheel It has a wheel pilot portion that guides the radial surface, and at least the wheel pilot portion is composed of a plurality of divided pilots divided in the circumferential direction, and at least the turning end side of the circumferential end portions of the divided pilots The chamfered portion is formed by forging at the end of the wheel, and the chamfered portion has a predetermined inclination angle with respect to the tangential direction of the pilot circle after turning, so that the weight of the wheel pilot portion can be reduced. During the turning process, the process of removing the cutting burrs at the circumferential end of the divided pilot is not necessary, and the cost can be reduced by reducing the number of man-hours and the cutting removal volume by the turning process.

  An outer member integrally having a vehicle body mounting flange to be attached to a knuckle on the outer periphery, and a double row outer rolling surface formed integrally on the inner periphery, and a wheel for attaching a wheel to an end portion on the outer side A hub wheel integrally having a mounting flange 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 An inner member comprising an inner ring press-fitted into a small-diameter step portion of the hub wheel and having an inner rolling surface facing the other of the outer rolling surfaces of the double row on the outer periphery, and the inner member and the outer member The inner ring is formed by a crimping portion formed by plastically deforming the end of the small diameter step portion radially outward. In the wheel bearing device fixed in the axial direction with respect to the hub wheel, the hub wheel includes the hub wheel. A brake pilot portion extending from the base of the wheel mounting flange to the outer side and guiding the inner diameter surface of the brake rotor; and a wheel pilot portion extending further from the brake pilot portion to the outer side and guiding the inner diameter surface of the wheel; At least this wheel pilot part is composed of a plurality of divided pilots divided in the circumferential direction, and a linear chamfered part is formed by forging at the circumferential direction end part of the divided pilot. It has an inclination angle of 30 ° or less with respect to the tangential direction of the pilot circle after turning.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is an enlarged view of a main part showing a wheel pilot portion of FIG. 4 is an enlarged view of a main part showing a modification of FIG.

  This wheel bearing device is a wheel bearing device that rotatably supports a driven wheel. The wheel bearing device 2 rolls between an inner member 3, an outer member 4, and both members 3, 4. A plurality of rolling elements (balls) 5 and 5 accommodated freely are provided. Here, the inner member 3 refers to the hub wheel 1 and the inner ring 10 press-fitted into the hub wheel 1.

  The hub wheel 1 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at one end portion on the outer side, an inner side rolling surface 1a on the outer side (one side) on the outer periphery, and this inner side rolling. A small diameter step 7 extending in the axial direction from the surface 1a is formed. Hub bolts 6 a for fastening the wheels are planted at the circumferentially equidistant positions of the wheel mounting flanges 6.

  The inner ring 10 has an inner side (other side) inner raceway surface 10a formed on the outer periphery, and the inner ring 10 is press-fitted into the small-diameter step portion 7 of the hub wheel 1 through a predetermined squeeze. The end portion of the small-diameter stepped portion 7 is fixed in the axial direction with respect to the hub wheel 1 by a caulking portion 8 formed by plastic deformation outward in the radial direction, forming a so-called third generation self-retained structure. . As a result, the rigidity of the hub wheel 1 can be increased, and the weight and size can be reduced.

  Moreover, since it is not necessary to control the preload amount by tightening the inner ring firmly with a nut or the like as in the prior art, it is possible to simplify the incorporation into the vehicle and maintain the preload amount for a long time. In addition, the number of parts can be reduced, and the cost can be reduced in combination with the improvement of the incorporation. The wheel bearing according to the present invention is not limited to the illustrated third generation structure, and includes, for example, a so-called second generation structure in which a pair of inner rings are press-fitted into a small-diameter step portion of a hub wheel, and the first generation structure. Alternatively, a fourth generation structure may be used.

  The hub wheel 1 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and extends from the inner raceway surface 1a to the small diameter step portion 7 from the base portion on the inner side of the wheel mounting flange 6. Thus, the surface hardness is set to a range of 58 to 64 HRC by induction hardening. The caulking portion 8 is an unquenched portion having a material surface hardness of 25 HRC or less after forging. As a result, the rigidity of the hub wheel 1 is improved, and fretting wear on the fitting surface with the inner ring 10 can be prevented, and the durability of the hub wheel 1 is improved. In addition, the workability when plastically deforming the caulking portion 8 is improved, and the occurrence of cracks and the like during processing is prevented, and the reliability of the quality is improved.

  The outer member 4 integrally has a vehicle body mounting flange 4b to be attached to the knuckle (not shown) constituting the suspension device on the outer periphery, and the double row inner rolling surface of the inner member 3 on the inner periphery. Double row outer rolling surfaces 4a, 4a facing 1a, 10a are integrally formed. And the double row rolling elements 5, 5 are accommodated between the double row outer rolling surfaces 4a, 4a and the double row inner rolling surfaces 1a, 10a, and are held by the cage 9 so as to be freely rollable. . Further, seals 11 and 12 are attached to the opening of the annular space formed between the outer member 4 and the hub wheel 1 and the inner ring 10, and leakage of the lubricating grease sealed inside the bearing to the outside, Prevents rainwater and dust from entering the bearing from the outside.

  Similarly to the hub wheel 1, the outer member 4 is formed of medium and high carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and the double row outer rolling surfaces 4a and 4a are surfaced by induction hardening. It has been cured to a hardness of 58 to 64 HRC. On the other hand, the inner ring 10 and the rolling element 5 are made of 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. In addition, although the double row angular contact ball bearing which used the rolling elements 5 and 5 as a ball | bowl was illustrated here, the double row tapered roller bearing which uses a tapered roller for a rolling element may be sufficient not only in this.

  In the present embodiment, a cylindrical brake pilot portion 13 extending outward is formed at the base portion of the wheel mounting flange 6 in the hub wheel 1 to guide an inner diameter surface of a brake rotor (not shown). Further, a wheel pilot portion 14 that extends further outward from the brake pilot portion 13 is formed. The wheel pilot portion 14 guides the inner diameter surface of the wheel mounted on the brake rotor, and is formed to have a slightly smaller diameter than the brake pilot portion 13. And the notch 14a is provided in the multiple places of the circumferential direction, and it is comprised by the division | segmentation pilot 15 which was intermittently formed in the shape of a protrusion. The notch 14a may be positioned at the same phase as the hub bolt 6a, but here, the intermittent wheel pilot portion 14 has the same phase as the hub bolt 6a at the circumferentially equidistant positions as shown in FIG. Is formed. As a result, weight reduction can be achieved without reducing the rigidity of the hub wheel 1, and when the hub bolt 6 a is press-fitted into the wheel mounting flange 6, the outer side surface 6 b of the wheel mounting flange 6 is deformed. Can be suppressed.

  Here, as shown in an enlarged view of FIG. 3, a plurality of (here, five) divided pilots 15 constituting the wheel pilot portion 14 have chamfered portions 16 formed by forging at their circumferential ends. . The chamfered portion 16 is not simply formed perpendicular to the pilot circle P / C or parallel to the center of the circumferential length of the divided pilot 15, but is connected to the tangent line 17 of the pilot circle P / C. Are formed in a straight line having a predetermined inclination angle α. The inclination angle α is set to be 30 ° or less. If the inclination angle α exceeds 30 °, the turning angle after chamfering (indicated by the broken line in the figure) may increase the crossing angle between the chamfered portion 16 and the pilot circle P / C, which may cause cutting burrs. is there. This eliminates the need to remove the cutting burrs at the circumferential end of the split pilot 15 during the turning of the wheel pilot portion 14, and reduces the number of man-hours and the cutting removal volume (material loss) due to the turning. You can go down.

  FIG. 4 is a modification of the above-described divided pilot 15. The split pilot 18 has a chamfered portion 19 formed at the circumferential end thereof by forging. The chamfered portion 19 is formed in an arc shape having an inclination angle α of 30 ° or less with respect to the tangent line 17 of the pilot circle P / C. As a result, as in the above-described embodiment, the process of removing the cutting burrs at the circumferential end of the divided pilot 18 is not necessary, and the cutting removal portion by turning is further reduced, thereby further reducing the cost. it can.

  Here, an example is shown in which the equivalent chamfered portions 16 and 19 are formed at the circumferential ends of the divided pilots 15 and 18 by forging. However, the present invention is not limited to this, and if the turning direction is determined, the turning end side is determined. You may just form in. Although not shown, not only the wheel pilot portion 14 but also the brake pilot portion 13 may be divided in the circumferential direction and a similar chamfered portion may be formed at the circumferential end 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 generation to fourth generation structure in which rolling elements are balls, tapered rollers, or the like.

It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. It is a front view same as the above. It is a principal part enlarged view which shows the wheel pilot part of FIG. It is a principal part enlarged view which shows the modification of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. It is a front view same as the above. It is a principal part enlarged view which shows the wheel pilot part of FIG.

Explanation of symbols

1 ... hub wheel 1a, 10a ... inner rolling surface 2 ...・ Wheel bearing device 3 ... inner member 4 ... outer member 4a ... ... outside rolling surface 4b ... body mounting flange 5 ... rolling element 6・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 6b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side 7・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 8 ・ ・ ・ ・ ・ ・ ・ ・ Clamping part 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Cage 10 ..... Inner rings 11, 12 ..... Seal 13 ... ······························································ Wheel pilot portion 14a ... ..... split pilot 16, 19 ... chamfer 17 ... tangent 51 ...・ ・ ・ ・ ・ ・ ・ ・ Hub wheels 51a, 60a ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel bearing device 53 ・ ・ ・ ・..... inner member 54 ..... outer member 54a ........ outer rolling surface 54b. Car body mounting flange 54c ... Knuckle pilot section 55 ... Ball 56 ... Wheel mounting arm 56a ... Hub bolt 56b ... Hub bolt insertion hole 56c ... Rib 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step part 58 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping part 59 ・ ・ ・ ・ ・ ・ ・ ・・ Retainer 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 61 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 62 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Bolt insertion hole 63 ············· Part flange 64 ····················· Brake pilot portion ... Brake rotor 66 ... Wheel pilot part 66a ... Outer peripheral part 67 ... .... Wheel 68 ...・ ・ ・ ・ ・ Cutting burr P / C ・ ・ ・ ・ ・ ・ ・ ・ Pilot circle α ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inclination angle

Claims (5)

An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at an end on the outer side and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one press-fitted into the small-diameter step portion of the hub wheel An inner member comprising an outer joint member of one inner ring or a constant velocity universal joint, and an inner member in which a double row inner rolling surface facing the double row outer rolling surface is formed on the outer periphery;
In the wheel bearing device including the inner member and a double-row rolling element that is accommodated in a freely rolling manner between both rolling surfaces of the outer member,
The hub wheel extends from the base portion of the wheel mounting flange to the outer side and guides the inner surface of the brake rotor, and the wheel further extends from the brake pilot portion to the outer side and guides the inner surface of the wheel. It has a pilot part, and at least this wheel pilot part is composed of a plurality of divided pilots divided at equal intervals in the circumferential direction, and forging is performed on at least the end of the circumferential end of the divided pilot on the turning end side The wheel bearing device is characterized in that a chamfered portion is formed, and the chamfered portion has a predetermined inclination angle with respect to the tangential direction of the pilot circle after turning.   The wheel bearing device according to claim 1, wherein the inclination angle is set to 30 ° or less.   The wheel bearing device according to claim 1 or 2, wherein the chamfered portion is formed in a linear shape.   The wheel bearing device according to claim 1 or 2, wherein the chamfered portion is formed in an arc shape.   The brake pilot portion is composed of a plurality of divided pilots divided at equal intervals in the circumferential direction, and at least a turning end side end portion of the divided pilots has a predetermined inclination angle by forging. The wheel bearing device according to claim 1, wherein a chamfered portion is formed, and the chamfered portion has a predetermined inclination angle with respect to a tangential direction of the pilot circle after turning.

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