JP2005119383A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel with face deflection accuracy of a flange side face improved as much as possible by preventing the flange side face from deforming due to hub bolt pressure-fit, and its manufacturing method. <P>SOLUTION: Before a hub bolt is pressure-fit in a wheel mounting flange 4, an outer periphery of a small-diameter step part 2b formed on an outer periphery of a hub wheel 2 is supported by a supporting tool 13, and an end face 12 of the small-diameter step part 2b is adsorbed on a backing plate 15. The hub wheel 2 is rotated under a condition that a dummy bolt 16 having a predetermined tightening margin is pressure-fit into a bolt hole 11 formed on the wheel mounting flange 4, so that the flange side face 12 is ground by a cutting tool 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like and a brake rotor with respect to a suspension device, and a manufacturing method thereof.

  The wheel bearing device supports, for example, a vehicle wheel and a brake rotor so as to be rotatable with respect to a knuckle constituting a suspension device. Further, wheel bearing devices include those for driving wheels and those for driven wheels, and those having various structures have been known. In this wheel bearing device, the brake rotor is fastened between the side surface of the wheel mounting flange and the wheel, and the axial runout of the brake rotor is caused by vibration and the deviation of the rotor side surface as the vehicle speed increases. It may cause wear. The vibration of the brake rotor is accompanied by an unpleasant noise during braking of an automobile and is generally called judder. In order to suppress this judder, it is important to suppress the axial vibration of the side surface of the brake rotor. .

  Conventionally, in order to suppress the vibration of the brake rotor, automakers have been able to find out the smallest phase of vibration by changing the phase between the hub bolt press-fitted into the wheel mounting flange and the brake rotor. However, not only skill is required, but it is cumbersome and workability is poor. Therefore, in order to eliminate the need to adjust the brake rotor deflection at the customer site, it is essential to improve the surface deflection accuracy of the wheel mounting flange of the wheel bearing device. Since it is press-fitted and fixed at about 0.15 to 0.35 mm, the hub bolts on the flange side face or the hub bolt part bulges in a convex shape, and as a result, a rotational direction undulation of about 10 to 20 μm occurs on the flange side face. The surface runout accuracy of the flange side surface is degraded.

FIG. 7 is a schematic view showing a deformed state of the flange side surface by hub bolt press-fitting (indicated by a two-dot chain line in the figure). (A) shows a deformation that occurs when the serration 102 formed on the outer diameter of the hub bolt 101 press-fitted into the wheel mounting flange 100 is displaced to the outside of the flange side surface 103, and between the hub bolts 101 on the flange side surface 103. Is deformed into a convex shape. On the other hand, what is shown in (b) is a deformation that occurs when the serration 102 of the hub bolt 101 is displaced to the inside of the flange side surface 103, and the vicinity of the hub bolt 101 on the flange side surface 103 is deformed into a convex shape. As a wheel bearing device in which the influence of the deformation of the flange side surface 103 due to the press-fitting of the hub bolt 101 is suppressed, a structure as shown in FIG. 8 is known.

The wheel bearing device includes an outer member 51 fixed to the suspension device, an inner member 52 to which the brake rotor 58 is attached, and a double row housed between the outer member 51 and the inner member 52. Rolling bodies 53, 53, retainers 54, 54 that hold the rolling bodies 53, 53 so as to freely roll, and seals 55, 55 attached to both ends of the outer member 51 are provided.

  A wheel mounting flange 56 that extends radially outward is integrally provided at one end of the outer periphery of the inner member 52. The wheel mounting flange 56 has five axially extending bolt holes 57 penetrating in the axial direction, and a hub bolt 60 is inserted therethrough. A serration 61 is formed in the neck lower portion 60 a of the hub bolt 60, and it is inserted into the inner peripheral surface of the bolt hole 57 and is press-fitted and fixed. Also, the brake rotor 58 and the wheel 59 are fitted to the foot portion 60b of the hub bolt 60 protruding in the axial direction from the wheel mounting flange 56, and the fixing nut 62 is screwed into the screw portion 60c formed on the foot portion 60b. Thus, the brake rotor 58 and the wheels 59 are fixed. As a result, the brake rotor 58 is fixed in a state of being pressed against the side surface 64 of the wheel mounting flange 56.

On the side surface 64 of the wheel mounting flange 56 to which the brake rotor 58 is mounted, a belt-like groove portion 63 continuous on the circumference is formed, and the bolt hole 57 is located in the belt-like groove portion 63. Due to the belt-like groove 63, the bolt hole 57 is recessed in the axial direction from the side face 64 of the wheel mounting flange 56. Thereby, the influence of the press-fitting of the hub bolt 60 is stopped in the belt-like groove portion 63, and the influence on the side surface 64 of the wheel mounting flange 56 outside the belt-like groove portion 63 is suppressed.
Japanese Patent No. 3091990

  In such a conventional wheel bearing device, the influence of the press-fitting of the hub bolt 60 stops in the belt-like groove 63 and the influence on the side surface 64 of the wheel mounting flange 56 outside the belt-like groove 63 is suppressed. It is necessary to perform processing with 63, which not only increases the number of processing steps but also decreases the strength of the wheel mounting flange 56, which is not preferable. In addition, it cannot be applied when there is no dimensional allowance between the outer diameter of the wheel mounting flange 56 and the hub bolt 60.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and prevents the deformation of the flange side surface due to hub bolt press-fitting and improves the surface runout accuracy of the flange side surface as much as possible. It aims to provide a method.

  In order to achieve such an object, the invention according to claim 1 of the present invention is opposed to the outer member having a double row outer rolling surface formed on the inner periphery, and the double row outer rolling surface. An inner member on which an inner rolling surface is formed, and a double-row rolling element that is rotatably accommodated between the inner member and the rolling surface of the outer member, the outer member or In a wheel bearing device in which either one of the inner members is integrally formed with a wheel mounting flange, and the side surface of this flange is the mounting surface of the brake rotor, the maximum runout width of the surface runout of the brake rotor mounting surface is set to the fixed side. It is regulated to 20 μm or less in a state where it is rotationally driven with respect to the member.

  In this way, the maximum runout width of the runout of the brake rotor mounting surface is regulated to 20 μm or less in a state where it is rotationally driven with respect to the fixed side member. Can be suppressed, and judder while the vehicle is running can be prevented.

  Further, in the invention according to claim 2, the inner member integrally has a wheel mounting flange at one end, and a hub wheel formed with a small-diameter step portion extending in an axial direction from the wheel mounting flange, Since the inner ring is fixed in the axial direction by a crimping portion formed by plastically deforming the end of the small diameter step portion radially outward, the inner ring is press-fitted into the small diameter step portion. Thus, it is not necessary to tightly tighten with a nut or the like to manage the preload amount, the ease of incorporation into the vehicle can be simplified, and the preload amount can be maintained for a long time. In addition, the number of parts can be reduced, and the apparatus can be reduced in weight and size.

  According to a third aspect of the present invention, the inner member integrally has a wheel mounting flange at one end, an inner rolling surface is formed on the outer periphery, and a concavo-convex portion cured on the inner periphery is formed. And an outer joint member of a constant velocity universal joint having a hollow stem portion fitted inside the hub wheel, and the fitting portion formed in the stem portion is expanded in diameter to form the uneven portion. By biting in, the hub wheel and the outer joint member are plastically connected, so that the number of parts can be further reduced and the device can be made lighter and more compact.

According to a fourth aspect of the present invention, there is provided a method invention according to claim 4, wherein an outer member having a double row outer rolling surface formed on the inner periphery, and an inner rolling surface facing the double row outer rolling surface. And a double row rolling element that is rotatably accommodated between the rolling surfaces of the inner member and the outer member, and the outer member or the inner member. In either method, the wheel mounting flange is integrally formed on one side, the bolt holes are formed in the circumferential direction of the wheel mounting flange, and the bolts are press-fitted into the bolt holes. Before press-fitting the bolt into the wheel mounting flange, a side surface of the wheel mounting flange is cut in a state in which a dummy bolt is press-fitted in advance with a predetermined scissors.

  Thus, before press-fitting the bolt into the wheel mounting flange, the side surface of the wheel mounting flange is cut in a state in which the dummy bolt is press-fitted in advance with a predetermined squeeze. Is removed from the bolt holes, and before the bolts are press-fitted into the wheel mounting flange, the deformation direction is opposite to the deformation direction at the time of the bolt press-fitting. A flat flange side surface having a desired surface runout accuracy with high accuracy is obtained.

  Preferably, as in the invention described in claim 5, if the outer diameter of the dummy bolt is set in advance in consideration of the squeeze between the bolt and the bolt hole, the flange side face is press-fitted with the bolt. The part which rises in a convex shape is formed on substantially the same amount of concave surface.

According to a sixth aspect of the present invention, the side surface of the wheel mounting flange is cut after the member having the wheel mounting flange is subjected to a grinding process through a turning process and a heat treatment process of each part. Therefore, the member can be supported with high accuracy, and the accuracy of cutting of the flange side surface can be improved.

Further, as in the invention described in claim 7, the side surface of the wheel mounting flange may be turned by a cutting tool, or by grinding by a grinding wheel as in the invention described in claim 8. Also good.

  The wheel bearing device according to the present invention includes an outer member in which a double row outer rolling surface is formed on an inner periphery, and an inner side in which an inner rolling surface facing the double row outer rolling surface is formed. A member, and a double-row rolling element accommodated in a freely rolling manner between the rolling surfaces of the inner member and the outer member, and a wheel is attached to either the outer member or the inner member. In the wheel bearing device in which the flange is integrally formed and the side surface of the flange is the mounting surface of the brake rotor, the maximum runout width of the surface runout of the brake rotor mounting surface is rotationally driven with reference to the fixed side member. Since the restriction is set to 20 μm or less, it is possible to suppress the axial shake of the side surface of the brake rotor after the brake rotor is attached, and to prevent judder during traveling of the vehicle.

  Further, in the method for manufacturing a wheel bearing device according to the present invention, an outer member having a double row outer raceway formed on the inner periphery, and an inner race facing the double row outer raceway. An inner member on which a running surface is formed, and a plurality of rolling elements housed between the inner member and the rolling surface of the outer member so as to roll freely, the outer member or the inner member. A wheel bearing flange is integrally formed on any one of the members, a bolt hole is formed in the circumferential direction of the wheel mounting flange, and a bolt is press-fitted into the bolt hole. The side surface of the wheel mounting flange is cut in a state in which the dummy bolt is press-fitted in advance with a predetermined squeeze before the bolt is press-fitted into the wheel mounting flange. Remove from the wheel mounting flange Before the bolt is press-fitted, the deformation direction is opposite to the deformation direction at the time of the bolt press-fitting, so by actually press-fitting the bolt into the bolt hole, there is a high precision desired surface runout accuracy without waviness. A flat flange side surface is obtained.

An outer member having a double row outer raceway formed on the inner periphery, a hub wheel integrally having a wheel mounting flange at one end and a small-diameter step portion extending in the axial direction from the wheel mounting flange, An inner member composed of an inner ring press-fitted into the small-diameter step portion, and a double row rolling element accommodated in a freely rolling manner between the inner member and the rolling surface of the outer member, A caulking portion is formed by plastically deforming the end portion of the small diameter step portion radially outward. The inner ring is fixed in the axial direction by the caulking portion, and the circumferential direction of the wheel mounting flange, etc. In the method of manufacturing a wheel bearing device in which a bolt hole is formed and a hub bolt is press-fitted into the bolt hole, before the hub bolt is press-fitted into the wheel mounting flange, a dummy bolt is press-fitted in advance with a predetermined squeeze The side surface of the wheel mounting flange It is cutting.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side closer to the center is referred to as the inboard side (right side in the drawing).

  The wheel bearing device includes an inner member 1, an outer member 10, and double-row rolling elements (balls) 5, 5 accommodated between the members 1, 10. The inner member 1 includes a hub ring 2 and a separate inner ring 3 that is externally fitted to the hub ring 2. The hub wheel 2 integrally has a wheel mounting flange 4 for mounting a wheel (not shown), and a hub bolt 4a for fixing the wheel is press-fitted at a circumferentially equidistant position of the wheel mounting flange 4. Yes. The inner ring 3 is press-fitted into the small-diameter step portion 2b formed on the hub wheel 2, and the end portion of the small-diameter step portion 2b is plastically deformed outward in the radial direction. Thus, the inner ring 3 is prevented from coming off in the axial direction.

  The outer member 10 integrally has a vehicle body mounting flange 10b for mounting to a vehicle body (not shown) on the outer periphery, and double row outer rolling surfaces 10a, 10a are formed on the inner periphery. On the other hand, in the inner member 1, double-row inner rolling surfaces 2 a and 3 a facing the double-row outer rolling surfaces 10 a and 10 a of the outer member 10 are integrally formed on the outer circumferences of the hub wheel 2 and the inner ring 3, respectively. ing. And the double-row rolling elements 5 and 5 are accommodated between each rolling surface 10a, 2a and 10a, 3a. The cage 6 holds the double-row rolling elements 5 and 5 in a rollable manner. Sealing devices 7 and 8 are attached to the end of the outer member 10 to prevent leakage of the lubricating grease sealed inside the bearing and to prevent rainwater and dust from entering from the outside. Such a structure is called a third-generation wheel bearing of the self-retain type, and it is not necessary to control the preload by tightening firmly with a nut or the like as in the prior art, so that it can be easily incorporated into a vehicle. And the preload amount can be maintained for a long time. Here, the double row angular contact ball bearing in which the rolling elements 5 and 5 are balls has been illustrated, but the present invention is not limited thereto, and a double row tapered roller bearing using a tapered roller as the rolling element may be used.

  The hub wheel 2 is formed of medium carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and includes a base portion 4b on the outboard side of the wheel mounting flange 4 and an inner rolling surface 2a on the outboard side. The surface hardness of the seal land portion slidably contacting the seal device 7 and the small diameter step portion 2b is hardened by induction hardening in a range of 58 to 64 HRC (indicated by cross-hatching in the figure). The caulking portion 2c is an unquenched portion having a surface hardness of 24HRC or less after forging. On the other hand, the inner ring 3 is made of high carbon chrome bearing steel such as SUJ2, and is hardened in the range of 54 to 64 HRC up to the core portion by quenching.

  The outer member 10 is formed of medium carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and ends to which the sealing devices 7 and 8 are fitted including the double row outer rolling surfaces 10a and 10a. The inner surface of the part is hardened by induction hardening to a surface hardness of 58 to 64 HRC.

  Here, the hub wheel 2 is subjected to a grinding process of a predetermined part through a turning process of each part, a bolt hole process of the hub bolt 4a, and a heat treatment process by induction hardening. Thereafter, the hub bolt 4a is press-fitted into the bolt hole 11. Before, turning of the flange side surface 12 of the wheel mounting flange 4 as shown in FIG. 2 is performed. This is because the outer periphery of the small-diameter step 2b is supported by the support 13, the end surface 12 of the small-diameter step 2b is attracted to the backing plate 15, and the dummy bolt 16 is press-fitted into the bolt hole 11 formed in the flange side surface 12. The hub wheel 2 is rotated in the state. Then, the flange side surface 12 is turned by the cutting tool 18.

  The dummy bolt 16 protrudes from the end face of the cylindrical bolt jig 17 and corresponds to the bolt hole 11 of the wheel mounting flange 4. The outer diameter of the dummy bolt 16 is set in advance in consideration of the squeeze between the hub bolt 4 a and the bolt hole 11. The wheel mounting flange 4 is deformed by press-fitting the dummy bolt 16 into the bolt hole 11, and the flange side surface 12 is turned in that state. Therefore, when the dummy bolt 16 is extracted from the bolt hole 11 after processing, the flange side surface 12 The portion where the hub bolt 4a is press-fitted and rises in a convex shape is formed with substantially the same amount of concave surface. That is, before the hub bolt 4a is press-fitted into the wheel mounting flange 4, the hub bolt 4a is deformed in a direction opposite to the deformation direction at the time of press-fitting the hub bolt 4a, so that by actually press-fitting the hub bolt 4a into the bolt hole 11, A flat flange side surface 12 having a desired surface runout accuracy with high accuracy without waviness is obtained.

By adopting such a manufacturing method, the maximum runout width of the flange side surface 12 can be suppressed to 20 μm or less in a state where the hub wheel 2 is rotated with respect to the outer member 10. Therefore, since the flange side surface 12 serves as a mounting surface for the brake rotor (not shown), it is possible to suppress axial deflection of the side surface of the brake rotor after mounting the brake rotor, and to prevent judder during traveling of the vehicle. Can do.

  FIG. 4 is a schematic view showing the hub wheel 2 when the dummy bolt 16 is removed after turning the flange side surface 12, and FIG. 4A shows the serration of the hub bolt (not shown) press-fitted into the wheel mounting flange 4. In consideration of the convex deformation that occurs when it is displaced to the outside of 12, the hub bolts on the flange side surface 12 are deformed in a concave shape in advance before press-fitting the hub bolts. On the other hand, the one shown in (b) is for considering the convex deformation that occurs when the serrations of the hub bolts are displaced to the inside of the flange side surface 12. Before the hub bolt press-fit, the vicinity of the bolt holes 11 on the flange side surface 12 Is deformed into a concave shape.

The finishing of the flange side surface 12 of the wheel mounting flange 4 is not limited to the turning process, and may be a grinding process as shown in FIG. In this process, the hub wheel 2 is supported by the support 15 on the outer periphery of the small-diameter step portion 2b, and the end surface 14 of the small-diameter step portion 2b is adsorbed to the backing plate 15 and formed on the flange side surface 12 in the same manner as the turning process described above. The hub wheel 2 is rotated in a state where the dummy bolts 16 are press-fitted into the bolt holes 11 formed. Then, the flange side surface 12 is ground by the grinding wheel 19. When the flange base 4b on the outboard side is hardened by heat treatment in order to increase the strength of the wheel mounting flange 4, it can be turned with a carbide tip, but due to the difference in surface hardness, the flange base 4b A slight processing residue may occur, and the surface runout accuracy of the flange side surface 12 may be reduced. Therefore, in such a case, it is preferable to grind the flange side surface 12 with the grinding wheel 19.

  FIG. 5 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention. This embodiment is applied to a wheel bearing device on the driving wheel side of an automobile. The same parts as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  This wheel bearing device mainly includes a wheel bearing 20 and a hub wheel 22 that rotatably supports the wheel bearing 20 with respect to a knuckle (not shown). The hub wheel 22 is formed with a wheel mounting flange 4 for mounting a wheel (not shown) at an end portion on the outboard side, and a cylindrical small-diameter step portion 2b extending in an axial direction from the wheel mounting flange 4. Yes. Hub bolts 4a for fastening the wheels are press-fitted into the wheel mounting flange 4 at equal intervals in the circumferential direction. A serration (or spline) 23 is formed on the inner periphery of the hub wheel 22, and a wheel bearing 20 described later is press-fitted on the outer peripheral surface of the small-diameter step portion 2b. A constant velocity universal joint (not shown) is fitted into the hub wheel 22, and torque from the engine is transmitted to the hub wheel 22 via the serration 23.

  The wheel bearing 20 includes an outer ring 24, a pair of inner rings 25, 25, and double-row rolling elements 5, 5. A double-row outer rolling surface 10 a, 10 a is integrally formed on the inner periphery of the outer ring 24. ing. On the outer periphery of the inner ring 25, an inner rolling surface 25a facing the outer rolling surfaces 10a and 10a is formed. The outer ring 24 and the inner ring 25 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 54 to 64 HRC to the core part by quenching.

  The wheel bearing 20 is press-fitted into the small-diameter step portion 2b of the hub wheel 22, and the end portion of the small-diameter step portion 2b is plastically deformed radially outward to form the caulking portion 2c with respect to the hub wheel 22 for the wheel. The bearing 20 is prevented from coming off in the axial direction. The hub wheel 22 is formed of medium carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and the base portion 4b on the outboard side of the wheel mounting flange 4 and the inboard side of the wheel mounting flange 4 are formed. The surface hardness is hardened to a range of 58 to 64 HRC by induction hardening from the base 4c to the small diameter step 2b (indicated by cross hatching in the figure). The caulking portion 2c is an unquenched portion having a surface hardness of 24HRC or less after forging.

Also in this embodiment, the flange side surface 12 of the wheel mounting flange 4 deforms the wheel mounting flange 4 by press-fitting a dummy bolt (not shown) into the bolt hole 11 with a predetermined squeeze in advance, as in the above-described embodiment. It is cut in the state of letting it. Therefore, before the hub bolt 4a is press-fitted into the wheel mounting flange 4, the hub bolt 4a is deformed in a direction opposite to the deformation direction at the time of press-fitting the hub bolt 4a, so by actually press-fitting the hub bolt 4a into the bolt hole 11, A flat flange side surface 12 having a desired surface runout accuracy with high accuracy without waviness is obtained.

  FIG. 6 is a longitudinal sectional view showing a third embodiment of the wheel bearing device according to the present invention. This embodiment is applied to a wheel bearing device having a fourth generation structure, and the same components and parts as those of the above-described embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  The wheel bearing device includes a hub wheel 26, a double row rolling bearing 27, and a constant velocity universal joint 28 as a unit. The hub wheel 26 integrally has a wheel mounting flange 4 for mounting a wheel (not shown) at an end portion on the outboard side, and hub bolts 4a are press-fitted at circumferentially equidistant positions. Concave and convex portions 29 are formed on the inner peripheral surface of the hub wheel 26, and a hardened layer is formed with a surface hardness of 54 to 64 HRC by heat treatment (indicated by cross hatching in the figure). As the heat treatment, local heating is preferable, and quenching by high-frequency induction heating that can set the hardened layer depth relatively easily is preferable.

  The concavo-convex portion 29 is formed by orthogonally arranging a plurality of rows of grooves, for example, a plurality of annular grooves formed independently by turning or the like and a plurality of axial grooves formed by broaching or the like. It is formed in the shape of an iris knurl with an intersecting groove structure configured to be orthogonal to each other or an intersecting groove structure composed of spiral grooves inclined to each other. Moreover, the convex part of the uneven | corrugated | grooved part 29 is formed in spire shape, such as triangular shape, in order to ensure favorable bite property.

  The double row rolling bearing 27 includes an outer member 10, an inner member 30, and double row rolling elements 5 and 5. The outer member 10 integrally has a vehicle body mounting flange 10b for mounting to a vehicle body (not shown) on the outer periphery, and double row outer rolling surfaces 10a, 10a are formed on the inner periphery. On the other hand, the inner member 30 refers to the hub wheel 26 and an outer joint member 31 to be described later. The inner rolling surface 2a on the outboard side facing the outer rolling surfaces 10a and 10a of the outer member 10 is connected to the hub wheel 26. An inner rolling surface 31 a on the inboard side is formed on the outer periphery of the outer joint member 31. Double row rolling elements 5, 5 are accommodated between the rolling surfaces 10a, 2a and 10a, 31a, respectively, and are held by the cage 6 so as to be freely rollable. The surface hardness is hardened to a range of 58 to 64 HRC by induction hardening from the seal land portion on the outer periphery of the hub wheel 26 to the inner rolling surface 2a and the in-row portion 26a.

  The constant velocity universal joint 28 includes an outer joint member 31, a joint inner ring, a cage, and a torque transmission ball (not shown). The outer joint member 31 has a cup-shaped mouth portion 32, a shoulder portion 33 that forms the bottom portion of the mouth portion 32, and a stem portion 34 that extends in the axial direction from the shoulder portion 33. A curved track groove 32a extending in the axial direction is formed.

  The inner rolling surface 31a described above is formed on the outer periphery of the shoulder 33 of the outer joint member 31 formed in a hollow shape. Further, the stem portion 34 is formed with a small diameter step portion 34 a into which the inrow portion 26 a of the hub wheel 26 is press-fitted, and a fitting portion 34 b that is fitted to the inner peripheral surface of the hub wheel 26. The fitting portion 34b is fitted into the hub wheel 26 in a state where the inrow portion 26a of the hub wheel 26 press-fitted into the small diameter step portion 34a is abutted against the shoulder portion 33. Then, the fitting part 34b is expanded in diameter by an appropriate means such as inserting / removing the mandrel into / from the inner diameter of the fitting part 34b, and the fitting part 34b is added to the concave / convex part 29 of the hub wheel 26. The hub ring 26 and the outer joint member 31 are plastically coupled by tightening. As a result, since this coupling portion has both the torque transmission means and the axial coupling means of the hub wheel 26 and the outer joint member 31, torque transmission means such as conventional serrations are formed on the hub wheel and the outer joint member. It is not necessary to provide means for connecting them in the axial direction, and the apparatus can be made lighter and more compact.

  The outer joint member 31 is subjected to surface hardening treatment from the seal land portion in which the track 8 formed in the inner periphery of the mouth portion 32 and the seal 8 are in sliding contact to the inner rolling surface 31a and the small diameter step portion 34a. ing. Quenching by high frequency induction heating is suitable as the curing treatment. Moreover, the fitting part 34b to be expanded is an unquenched part having a surface hardness of 24 HRC or less after forging, and the hardness difference between the surface hardness 54 to 64 HRC of the uneven part 29 of the hub wheel 26 is 30 HRC or more. It is preferable to set to. Thereby, the fitting part 34b can easily and deeply bite into the concavo-convex part 29, and both can be firmly plastically bonded without the tip of the concavo-convex part 29 being crushed. An end cap (not shown) is attached to the inner diameter of the hollow outer joint member 31 to prevent leakage of the lubricating grease enclosed in the mouth portion 32 to the outside and dust intrusion from the outside.

  In this embodiment, the number of parts can be reduced as compared with the above-described embodiment, and the apparatus can be further reduced in weight and size. Further, as described above, the flange side surface 12 of the wheel mounting flange 4 is cut in a state where the wheel mounting flange 4 is deformed by press-fitting a dummy bolt (not shown) into the bolt hole 11 with a predetermined squeeze in advance. Has been processed. Therefore, before the hub bolt 4a is press-fitted into the wheel mounting flange 4, the hub bolt 4a is deformed in a direction opposite to the deformation direction at the time of press-fitting the hub bolt 4a, so by actually press-fitting the hub bolt 4a into the bolt hole 11, A flat flange side surface 12 having a desired surface runout accuracy with high accuracy without waviness is obtained.

  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 is not limited to the illustrated embodiment, but the wheel bearing device for the driven wheel side and the driving wheel side of the first generation to the third generation structure, and further for the wheel of the fourth generation structure. It can be applied to a bearing device. The present invention can also be applied to an outer ring rotating type wheel bearing device.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is explanatory drawing which shows the cutting method of the flange side surface of the wheel mounting flange which concerns on this invention. It is explanatory drawing which shows the other cutting method same as the above. It is a schematic diagram which shows the deformation | transformation state after cutting the flange side surface which concerns on this invention, (a) shows the deformation | transformation state when the serration of the hub bolt press-fitted in a wheel mounting flange has shifted | deviated to the outer side of the flange side surface. . (B) shows a deformation | transformation state when the serration of a hub bolt same as the above has shifted | deviated to the inner side of the flange side surface. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. FIG. 5A is a schematic diagram showing a state of deformation of a side surface of a wheel mounting flange by press-fitting of a conventional hub bolt, and (a) shows deformation that occurs when the serration of the hub bolt press-fitted into the wheel mounting flange is shifted to the outside of the flange side surface. . (B) shows the deformation | transformation which arises when the serration of a hub bolt same as the above has shifted | deviated inside the flange side surface. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

Explanation of symbols

1, 30... Inner members 2, 22, 26... Hub wheels 2a, 3a, 25a, 31a .. Inner rolling surfaces 2b, 34a. ······ Small diameter step 2c ·································································・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 4a ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 4b ・ ・ ・ ・ ・ ・ ・ ・ Flange base 4c on the outboard side .... Flange base 5 on the inboard side ... ... Rolling element 6 ... ... Cage 7 , 8 ... Seal 10 ... Outer member 10a ... Outer rolling surface 10b ..... Body mounting flange 11 ... ... Bolt hole 12 ... Flange side face 13 ... Support tool 14 ... End face 15 Backing plate 16 Dummy bolt 17 ... Bolt jig 18 ... Cutting tool 19 ... Grinding wheel 20 ... .... Wheel bearings 21 ... Knuckles 23 ... Serrations 24 ... Outer rings 26a ·································· 27 Universal joint 29 ... Uneven part 3・ ・ ・ ・ ・ ・ ・ ・ Outer joint member 32 ・ ・ ・ ・ ・ ・ ・ ・ Mouse part 32a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Track groove 33 ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 34 ・ ・ ・ ・ ・ ・ ・ ・ Stem 34b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fitting 51 ・ ・ ・ ・· · · · · · · · Outer member 52 · · · · · · Inner member 53 · · · · · · · · rolling element 54 · · · ······························································… ..... Bolt hole 58 ..... Brake rotor 59 ..... Wheel 60 ..... .... Hub bolt 60a ..... Bolt neck lower part 60b ...・ ・ ・ ・ ・ ・ ・ ・ Bolt foot 60c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Screw 61 ・ ・ ・ ・ ・ ・ ・ ・ Serration 62 ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ Fixing nut 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slot groove

Claims (8)

An outer member in which a double row outer rolling surface is formed on the inner periphery, an inner member in which an inner rolling surface opposite to the double row outer rolling surface is formed, and the inner member and the outer member A plurality of rolling elements housed in a freely movable manner between the rolling surfaces of the side members, and a wheel mounting flange is integrally formed on either the outer member or the inner member. In the wheel bearing device with the mounting surface of the brake rotor,
The wheel bearing device according to claim 1, wherein the maximum runout width of the brake rotor mounting surface is regulated to 20 μm or less in a state where the maximum runout is rotationally driven with reference to the stationary member.   The inner member has a wheel mounting flange integrally formed at one end, a hub wheel formed with a small-diameter step portion extending in the axial direction from the wheel mounting flange, and an inner ring press-fitted into the small-diameter step portion. The wheel bearing device according to claim 1, wherein the inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end portion of the small-diameter stepped portion radially outward.   The inner member integrally has a wheel mounting flange at one end, an inner rolling surface is formed on the outer periphery, and a hardened uneven portion is formed on the inner periphery; And the outer joint member of the constant velocity universal joint having a hollow stem portion. The hub ring and the outer The wheel bearing device according to claim 1, wherein the joint member is plastically coupled. An outer member in which a double row outer rolling surface is formed on the inner periphery, an inner member in which an inner rolling surface opposite to the double row outer rolling surface is formed, and the inner member and the outer member A plurality of rolling elements housed in a freely rolling manner between the rolling surfaces of the side members, and a wheel mounting flange is integrally formed on either the outer member or the inner member. In the method of manufacturing a wheel bearing device in which bolt holes are formed in the circumferential direction of the flange and the bolts are press-fitted into the bolt holes,
A method for manufacturing a wheel bearing device, wherein a side surface of the wheel mounting flange is cut in a state in which a dummy bolt is press-fitted in advance with a predetermined squeeze before the bolt is press-fitted into the wheel mounting flange. .   The wheel bearing device manufacturing method according to claim 4, wherein an outer diameter of the dummy bolt is set in advance in consideration of a squeeze between the bolt and a bolt hole.   The wheel bearing according to claim 4 or 5, wherein a side surface of the wheel mounting flange is cut after the member having the wheel mounting flange is subjected to a grinding process through a turning process and a heat treatment process of each part. Device manufacturing method.   The method for manufacturing a wheel bearing device according to any one of claims 4 to 6, wherein a side surface of the wheel mounting flange is turned by a cutting tool.   The method for manufacturing a wheel bearing device according to any one of claims 4 to 6, wherein a side surface of the wheel mounting flange is ground by a grinding wheel.

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