JP3943985B2 - Method for manufacturing drive wheel bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a drive wheel bearing device for supporting a drive wheel of an automobile or the like, and in particular, a drive wheel bearing device in which a hub wheel, a constant velocity universal joint, and a double row rolling bearing are unitized. It relates to a manufacturing method.
[0002]
[Prior art]
Driving wheels of automobiles such as rear wheels of FR vehicles, front wheels of FF vehicles, or all wheels of 4WD vehicles are supported on a suspension device by a bearing device for driving wheels. In recent years, bearing devices for drive wheels have a tendency to unitize a hub wheel, a constant velocity universal joint, and a bearing portion in order to reduce weight and size.
[0003]
FIG. 4 is a longitudinal sectional view showing a drive wheel bearing device, in which a hub wheel 1, a double row rolling bearing 2 and a constant velocity universal joint 3 are formed as a unit. The hub wheel 1 integrally has a wheel mounting flange 4 for mounting a wheel (not shown), and a hub bolt 6 for fixing the wheel is implanted at a circumferentially equidistant position of the wheel mounting flange 4. Yes.
[0004]
The double-row rolling bearing 2 has an outer member 7, an inner member 8, and double-row rolling elements 9, 9, and the outer member 7 is a vehicle body mounting flange for mounting to the vehicle body (not shown) on the outer periphery. 7a is integrally formed, and double row outer rolling surfaces 7b and 7b are formed on the inner periphery. On the other hand, the inner member 8 forms double row inner rolling surfaces 1a, 14a facing the outer rolling surfaces 7b, 7b of the outer member 7 described above. One inner rolling surface 1 a is integrally formed on the outer periphery of the hub wheel 1, and the other inner rolling surface 14 a is integrally formed on the outer periphery of the outer joint member 14 of the constant velocity universal joint 3. Double-row rolling elements 9, 9 are accommodated between these outer and inner rolling surfaces 7b, 1a and 7b, 14a, respectively, and are held by the retainers 11, 11 so as to be freely rollable. In this case, the inner member 8 refers to the hub wheel 1 and the outer joint member 14. Seals 12 and 13 are attached to the ends of the double-row rolling bearing 2 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater and dust from the outside.
[0005]
The constant velocity universal joint 3 includes an outer joint member 14, a joint inner ring (not shown), a cage, and a torque transmission ball. The outer joint member 14 has a cup-shaped mouth portion 15, a shoulder portion 16 that forms the bottom portion of the mouth portion 15, and a shaft portion 17 that extends from the shoulder portion 16 in the axial direction. A curved track groove 15a extending in the axial direction is formed.
[0006]
The shaft portion 17 of the outer joint member 14 formed in a hollow shape is fitted into the hub wheel 1, and the uneven portion 5 is hardened on the inner peripheral surface of the hub wheel 1, and the cylindrical small diameter step portion 1 b is formed at the end portion. Then, the diameter of the fitting portion 17b of the shaft portion 17 is expanded to bite into the concavo-convex portion 5, and the fitting portion 17b is caulked to plastically connect the hub wheel 1 and the outer joint member 14 (Japanese Patent Laid-Open No. 2004-260707). 2001-18605 publication).
[0007]
Conventionally, the aforementioned drive wheel bearing device has been manufactured by the following procedure (see FIG. 5). The shaft portion 17 of the outer joint member 14 is fitted into the hub wheel 1 and the mandrel M is fitted into the outer joint member 14 from above. Thereafter, the mandrel M is pushed in by a press machine, and the hub wheel 1 and the outer joint member 14 are plastically coupled. Since the mandrel M has a large-diameter portion M1 formed at the tip portion, when the mandrel M penetrates the inner diameter of the fitting portion 17b of the outer joint member 14, the fitting portion 17b is expanded in diameter, and the uneven portion 5 of the hub wheel 1 is expanded. The hub wheel 1 and the outer joint member 14 are integrally plastically joined.
[0008]
[Problems to be solved by the invention]
However, in the conventional method for manufacturing a drive wheel bearing device, when the mandrel M is pushed from above with a press, the mandrel M is slightly inclined and the mandrel M cannot be pushed vertically accurately. As a result, the inner diameter of the fitting portion 17b, that is, the enlarged diameter portion becomes elliptical, and the fitting portion 17b does not bite into the concavo-convex portion 5 evenly, resulting in uneven strength of the coupling portion. It is difficult to confirm the bonding state of this type of plastic deformation by visual inspection of the product, and it is not realistic to check the strength of each product because it is a destructive inspection for each product. Therefore, the above-described strength variation of the joint portion significantly reduces the reliability of the product quality. Further, in the diameter expansion process, a pressing amount of the press machine enters the mouse part, and a stroke amount is required until the mandrel M is completely extracted, and the press machine becomes large and the press machine becomes large. I also had problems.
[0009]
The present invention has been made in view of such circumstances, and is a bearing for a drive wheel that can stably expand the diameter of a fitting portion, has no variation in strength of a plastic coupling portion, and has improved quality reliability. It is an object of the present invention to provide a device manufacturing method.
[0010]
[Means for Solving the Problems]
In order to achieve such an object, the invention according to claim 1 of the present invention has a double row rolling bearing and a wheel mounting flange integrally formed on the outer periphery of one end portion and forms an uneven portion hardened on the inner peripheral surface. And at least one inner rolling surface of the inner rolling surfaces of the double row rolling bearing, a hub wheel having a cylindrical small diameter step portion extending in the axial direction from the inner rolling surface, and a cup-shaped mouse A constant velocity universal joint comprising a hollow outer joint member having a head portion, a shoulder portion forming the bottom portion of the mouse portion, and a shaft portion extending in the axial direction from the shoulder portion, and the hub wheel and the outer joint member And the hub ring and the outer joint member are integrally plasticized by expanding the diameter of the fitting portion of the outer joint member into the concave and convex portions of the hub ring. In the manufacturing method of the drive wheel bearing device to be coupled, A step of fitting a mandrel having a large-diameter portion formed with a larger diameter than the inner diameter of the fitting portion of the joint member into the outer joint member so that the large-diameter portion is disposed on the mouse side; The step of bringing the small diameter step portion of the hub wheel into contact with the shoulder portion of the outer joint member and fitting the hub wheel and the outer joint member together, and receiving the side surface of the wheel mounting flange on the outboard side. A step of supporting the base part by moving the mandrel and the cradle relative to each other so that the large diameter part of the mandrel penetrates the inner diameter of the fitting part of the outer joint member. A method of manufacturing a bearing device for a driving wheel was adopted in which the diameter of the fitting was made and the fitting portion was bitten into the uneven portion of the hub wheel so that the hub wheel and the outer joint member were integrally plastically coupled.
[0011]
In this way, the mandrel and the cradle are moved relative to each other, and the mandrel is inclined because the large-diameter portion of the mandrel extends through the inner diameter of the fitting portion of the outer joint member. The relative movement can be performed accurately vertically, the fitting portion can be evenly expanded in diameter, and can be caused to bite into the concavo-convex portion, and the strength variation of the coupling portion can be suppressed. Therefore, the reliability of the product can be improved and the quality can be greatly improved. Further, since the stroke amount of the press machine can be reduced, the press machine can be miniaturized, and the rigidity can be increased to improve the processing accuracy.
[0012]
Preferably, as in the invention described in claim 2, by fixing the mandrel and raising the cradle, the fitting portion of the outer joint member is expanded in diameter so that the concave portion of the hub wheel is bitten. If the hub wheel and the outer joint member are integrally plastically coupled, the mandrel can penetrate straight through the fitting portion inner diameter without inclining, and the fitting portion can be uniformly expanded to bite into the uneven portion. Can do. Moreover, even a hub wheel in which a hub bolt is pre-installed in a wheel mounting flange can be easily mounted by a pedestal that can be moved up and down, and the conventional wheel is mounted above the mounted device. Therefore, it is not necessary to provide a press machine such as that described above, so that complicated transport equipment or the like is not required, and assembly work is facilitated.
[0013]
According to a third aspect of the present invention, the fitting portion of the outer joint member is expanded by pulling out the lower end portion of the mandrel so that the concave portion of the hub wheel is bitten, A method in which the outer joint member is integrally plastically bonded may be employed. As a result, the mandrel can pass straight through the inner diameter of the fitting portion without being inclined, and the fitting portion can be evenly expanded in diameter to bite into the concavo-convex portion, and the stroke amount of the press machine can be reduced as compared with the prior art.
[0014]
Further, as in the invention according to claim 4, a lubricant film is formed in advance on at least the inner diameter of the fitting portion among the inner diameter of the fitting portion of the outer joint member and the surface of the mandrel so as to penetrate the mandrel. As a result, a stable diameter expansion amount can be obtained, a smooth diameter expansion operation can be performed, and the life of the mandrel M is also increased.
[0015]
Further, as in the invention according to claim 5, a lubricant is applied in advance to at least the inner diameter of the fitting portion among the inner diameter of the fitting portion of the outer joint member and the surface of the mandrel so as to penetrate the mandrel. May be.
[0016]
According to a sixth aspect of the present invention, one inner rolling surface of the double row rolling bearing is formed directly on the outer peripheral surface of the hub wheel, and the other inner rolling surface is formed on the outer joint member. If the so-called 4th generation structure is formed directly on the outer peripheral surface of the hub wheel, the hub wheel and the outer joint member can be assembled on the cradle on which the hub wheel is placed, and can be integrally plastically joined. It can be simplified in a small space.
[0017]
If a hub bolt is press-fitted into the wheel mounting flange in advance as in the seventh aspect of the invention, the press-fitting operation can be facilitated without interference with the vehicle body mounting flange of the outer member.
[0018]
Preferably, as in the invention described in claim 8, if the side surface on the outboard side of the wheel mounting flange is finish-cut after the plastic coupling, that is, cut after the assembly, the wheel is subjected to a bolt press-fitting process or a plastic coupling process. Even if the side surface of the mounting flange is deformed, it can be regulated to a desired surface accuracy.
[0019]
More preferably, as in the invention described in claim 9, if a pilot portion of a brake rotor is formed on the wheel mounting flange, and the pilot portion is finish-cut after the plastic coupling, the pilot due to the diameter expansion of the fitting portion The deformation of the part can be corrected, and the mounting work of the brake rotor can be simplified.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are process diagrams showing a method for manufacturing a drive wheel bearing according to the present invention.
[0021]
Since this drive wheel bearing device is the same as the conventional structure described above, the same reference numerals are assigned to the same parts and the detailed description thereof is omitted. In the following description, the side closer to the outside of the vehicle in the state 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).
[0022]
FIG. 1 is a process diagram before plastic coupling showing a state in which the drive wheel bearing device is placed on the cradle B and the mandrel M is inserted into the outer joint member 14. First, an assembling method until the apparatus is temporarily assembled will be described below.
(1) A hub bolt 6 is press-fitted into the wheel mounting flange 4 of the hub wheel 1.
(2) A seal 12 is attached to the end of the outer member 7 on the outboard side.
(3) Outboard rolling elements 9 (balls) of the double-row rolling bearings 2 are held by the cage 11, and the outer rolling surface 7 b of the outer member 7 on the outboard side and the hub wheel 1. The inner rolling surface 1a is accommodated.
(4) Lubricating grease is filled in the annular space between the outer member 7 and the hub wheel 1, and the inboard-side rolling elements (balls) 9 held by the retainer 11 are placed on the inboard-side of the outer member 7. Place on the outer rolling surface 7b. In order to prevent the rolling elements 9, 9 from falling off, lubricating grease may be applied in advance when the rolling elements 9, 9 are mounted on the cages 11, 11.
(5) The seal 13 is attached to the end of the outer member 7 on the inboard side. In addition, in order to protect the lips of the seals 12 and 13, lubricating grease is applied to the lip portion in advance.
(6) Next, the shoulder portion 16 of the outer joint member 14 and the small-diameter step portion 1b of the hub wheel 1 are brought into contact with each other, and the shaft portion 17 of the outer joint member 14 is fitted into the hub wheel 1 to temporarily assemble the device. To complete. Here, the small-diameter step portion 1b of the hub wheel 1 and the small-diameter step portion 17a of the shaft portion 17 become an inrow portion having a predetermined guide clearance, and can be fitted with the shaft centers aligned.
[0023]
The temporarily assembled device is placed on the cradle B in a state where the phases of the hub bolt 6 planted on the wheel mounting flange 4 of the hub wheel 1 and the through hole 18 drilled in the cradle B are matched. Here, since the cradle B is mounted on a hydraulic press or the like so as to be movable up and down, the temporary cradle B can be retracted before placing the horizontally transported apparatus. The hub wheel 1 may be placed on the cradle B and the temporary assembly described above may be performed.
[0024]
After placing the device on the cradle B, the mandrel M is fitted into the hollow outer joint member 14 from above. The large-diameter portion M1 of the mandrel M is formed with a predetermined diameter larger than the inner diameter of the fitting portion 17b in consideration of the diameter expansion amount. On the other hand, the shaft-like part M2 is formed to be slightly smaller in diameter than the inner diameter of the fitting part 17b, and guides the mandrel M so that it does not tilt. Further, when the large diameter portion M1 and the shaft-like portion M2 are connected by a tapered surface and the diameter is expanded, the taper angle is appropriately set so that excessive stress is not generated in the fitting portion 17b.
[0025]
Next, a method of assembling the temporarily assembled apparatus by plastic bonding will be described with reference to FIG.
After the large-diameter portion M1 of the mandrel M is inserted until it stops near the fitting portion 17b, a stopper (not shown) is brought into contact with the upper end of the mandrel M, and the cradle B is raised by a predetermined stroke. Thereafter, when the large diameter portion M1 of the mandrel M passes through the inner diameter of the fitting portion 17b and the diameter expansion is completed, the mandrel M is naturally dropped and collected. Instead of the stopper, a chuck mechanism (not shown) may be disposed at the upper end or the lower end of the mandrel M, and the mandrel M may be detachably gripped.
[0026]
As described above, the method of inserting and plastically coupling the mandrel M to the outer joint member 14 at each diameter expansion process has been described. However, the size of the mandrel M from the large diameter portion M1 to the lower end is shortened, and the upper end portion of the mandrel M is If the mandrel M is inserted into the outer joint member 14 by raising the cradle B while being detachably gripped by a chuck or the like, not only the mechanism for inserting the mandrel M but also after the diameter expansion process. A circulation mechanism or the like for collecting and transporting it upward is not necessary, and the assembly equipment can be simplified and the assembly time can be shortened. Further, it is not necessary to prepare a considerable amount of mandrels M in accordance with the assembly cycle time.
[0027]
On the other hand, when the hub bolt 6 is press-fitted, the periphery of the hub bolt 6 on the side surface 4a is deformed, and surface accuracy such as surface runout of the side surface 4a may be deteriorated. Further, the fitting portion 17b extends to the outboard side due to the above-described plastic coupling, and as a result, the side surface 4a of the wheel mounting flange 4 may be inclined to the inboard side. Such deterioration of the surface accuracy is one cause of the occurrence of brake judder, and in recent years, the surface accuracy of the side surface 4a of the wheel mounting flange 4 is desired to be improved along with the surface accuracy of the brake rotor side surface.
[0028]
In the drive wheel bearing device thus assembled, the vehicle body mounting flange 7a is chucked, and the hub wheel 1 or the outer joint member 14 is rotationally driven to finish the side surface 4a on the outboard side of the wheel mounting flange 4 with a lathe or the like. Cutting. By this assembly cutting, the surface accuracy of the side surface 4a can be regulated to a desired accuracy, the brake judder can be suppressed, and the steering stability of the vehicle can be improved.
[0029]
Further, a pilot portion 4b of a brake rotor (not shown) is formed on the wheel mounting flange 4 of the hub wheel 1, and if this pilot portion 4b is finish-cut after assembly, the pilot portion is expanded by expanding the fitting portion 17b. Even if 4b is deformed, it can be corrected, and the mounting work of the brake rotor can be simplified. This type of finish cutting refers to the case where primary cutting or further secondary cutting is performed in advance at the part stage, and secondary or tertiary cutting is performed after assembly, or when the forging skin is left at the part stage and cutting is performed after assembly. Say.
[0030]
FIG. 3 is a process diagram showing another embodiment in the method for manufacturing a drive wheel bearing device according to the present invention. In addition, the same code | symbol is attached | subjected to the same components same site | part, and the detailed description is abbreviate | omitted.
[0031]
The temporarily assembled device is placed on the cradle B. Thereafter, the mandrel M is inserted from above the outer joint member 14, and the lower end portion of the mandrel M is detachably gripped by a chuck mechanism (not shown). Next, the chuck mechanism is lowered, and the large-diameter portion M1 of the mandrel M penetrates the inner diameter of the fitting portion 17b to complete the diameter expansion. Due to this diameter expansion, the fitting portion 17b bites into the uneven portion 5 formed on the inner periphery of the hub wheel 1, and the hub wheel 1 and the outer joint member 14 are plastically coupled. Finally, the chuck is released and the mandrel M is collected.
[0032]
In the conventional method in which the mandrel M is pushed from above by a press machine, the mandrel M may be tilted due to collapse of the pushing portion of the press machine or the end face accuracy of the mandrel M. However, as in the method of the present invention, the mandrel M may be tilted. If the method of pulling out the lower end portion of M is adopted, it can be moved straight without being affected by the end face accuracy of the mandrel M. Further, unlike the conventional method, a long stroke amount until the pushing portion of the press machine enters the mouse portion 15 and the mandrel M is completely pulled out becomes unnecessary, and the press machine can be downsized. Furthermore, since it is not necessary to dispose a press machine or the like above the assembly facility, the apparatus can be easily transported and placed on the cradle B.
[0033]
As described above, in the method for manufacturing a drive wheel bearing device according to the present invention, the mandrel M is fitted and inserted into the outer joint member 14, and the inner diameter of the fitting portion 17 b is increased to bite into the uneven portion 5 of the hub wheel 1. The hub wheel 1 and the outer joint member 14 are integrally plastically joined. However, when the mandrel M is inserted, the inner diameter of the fitting portion 17b is galled or unevenly worn, and the friction coefficient is increased. Not only is the smooth diameter expansion operation difficult, but the diameter expansion may vary. In addition, the surface of the mandrel M itself becomes rough, which may further reduce the efficiency of the diameter expansion work.
[0034]
In such a situation, a coating film having a lubricating effect such as a phosphate film is coated on the inner diameter portion of the fitting portion 17b whose diameter is expanded in advance. As a result, a stable amount of diameter expansion can be obtained, a smooth diameter expansion operation can be performed, and the life of the mandrel M is also increased. Furthermore, by coating this type of lubricating film, the anti-corrosion ability of the exposed fitting portion is increased, and the product quality can be improved. In addition to this, examples of the lubricating coating include those mainly composed of molybdenum disulfide, graphite, manganese phosphate, and the like.
[0035]
Moreover, if such a lubricating coating is coated on the mandrel M, particularly the large diameter portion M1 and the tapered surface connecting the large diameter portion M1 and the shaft-shaped portion M2, the diameter expansion operation can be made more efficient. Previously, a method of applying lubricant or grease in advance to the surface of the mandrel M may be used. These lubricating oils and greases preferably contain an extreme pressure additive such as phosphorus.
[0036]
The embodiment of the present invention, that is, the so-called fourth generation structure in which one of the inner rolling surfaces of the double row rolling bearing is formed on the hub wheel and the other is formed on the outer joint member has been described. Of course, the present invention is not limited to these embodiments, but is merely an example, and can be implemented in various forms without departing from the gist of the present invention. The scope of the present invention is defined by the terms of the claims, and includes the equivalent meanings of the claims and all modifications within the scope. For example, one inner rolling surface of the inner rolling surfaces of a double row rolling bearing is formed as a hub ring, and the other inner rolling surface is formed as a separate inner ring, and this inner ring is formed as a small diameter step portion of the hub ring. A so-called third generation structure may be used.
[0037]
【The invention's effect】
As described in detail above, the method for manufacturing a bearing device for a drive wheel according to the present invention includes a mandrel having a large-diameter portion that has a larger diameter than the inner diameter of the fitting portion of the outer joint member. The step of fitting into the outer joint member so that the large-diameter portion is arranged on the inner surface, the small-diameter step portion of the hub wheel and the shoulder of the outer joint member are butted together, and the hub wheel and the outer joint member are fitted together And a step of supporting the side surface of the wheel mounting flange on the outboard side on the cradle, relatively moving the mandrel and the cradle, and the large-diameter portion of the mandrel increases the inner diameter of the fitting portion of the outer joint member. Adopting a method for manufacturing a bearing device for a drive wheel in which the diameter of the fitting portion is increased by penetrating, and the fitting portion is bitten into the uneven portion of the hub wheel so that the hub wheel and the outer joint member are integrally plastically coupled. As a result, the mandrel can be accurately suspended without tilting. To move relative to evenly expanded the fitting portion can bite into the irregular portion, it is possible to suppress the variations in strength of the coupling portion. Therefore, the reliability of the product can be improved and the quality can be greatly improved. Further, since the stroke amount of the press machine can be reduced, the press machine can be miniaturized, and the rigidity can be increased to improve the processing accuracy.
[0038]
Further, by fixing the mandrel and raising the cradle, the fitting portion of the outer joint member is expanded in diameter so as to bite into the uneven portion of the hub wheel, and the hub wheel and the outer joint member are integrally plastically coupled. Even if the hub wheel is pre-installed with a hub bolt on the wheel mounting flange, the hub wheel can be easily placed by a pedestal that can be moved up and down, and above the placed device as in the conventional case. Since it is not necessary to provide a simple press machine, complicated transportation facilities and the like are not required, and assembly work is facilitated. Furthermore, not only a mechanism for inserting and inserting a mandrel, but also a circulation mechanism that collects the mandrel after the diameter expansion process and conveys it upward is not necessary, and the assembly equipment can be simplified and the assembly time can be shortened. Can do. Further, since it is not necessary to prepare a considerable amount of the mandrel M in accordance with the assembly cycle time, the mass production effect is great.
[Brief description of the drawings]
FIG. 1 is a process diagram showing a method of manufacturing a drive wheel bearing device according to the present invention.
FIG. 2 Same as above.
FIG. 3 is a process diagram showing another embodiment of the method for manufacturing a drive wheel bearing device according to the present invention.
FIG. 4 is a longitudinal sectional view of a conventional drive wheel bearing device.
FIG. 5 is a process diagram showing a method of manufacturing a conventional drive wheel bearing device.
[Explanation of symbols]
1 ..... Hub wheel 1a, 14a ..... Inner rolling surface 1b, 17a ..... Small diameter step 2 ....・ ・ ・ ・ ・ Double-row rolling bearing 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Constant velocity universal joint 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 4a ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ Side 4b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pilot part 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Uneven part 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 7・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside member 7a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 7b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 8 ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 11 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cage 12, 13 ··· Seal 14 · · · Outer joint member 15 ··· Usb 15a ... Track groove 16 ... Shoulder 17 ... Shaft 17b ... ······ Fitting part 18 ·························································· Mandrel M1 ········· Large diameter part M2 ·········· Shaft-shaped part

Claims (9)

A double row rolling bearing and a wheel mounting flange are integrally formed on one end outer periphery, and a hardened uneven portion is formed on the inner peripheral surface, and at least one of the inner rolling surfaces in the double row rolling bearing is formed. An inner rolling surface, a hub ring having a cylindrical small-diameter step extending in an axial direction from the inner rolling surface, a cup-shaped mouse portion, a shoulder portion that forms the bottom of the mouse portion, and an axial direction from the shoulder portion A constant velocity universal joint having a hollow outer joint member having a shaft portion extending in a unit is unitized, and the hub wheel and the outer joint member are fitted to each other. In the manufacturing method of the bearing device for a drive wheel that integrally plastically connects the hub wheel and the outer joint member by enlarging the fitting portion of the outer joint member and biting in,
A step of fitting a mandrel having a large diameter portion formed to have a larger diameter than the inner diameter of the fitting portion of the outer joint member into the outer joint member so that the large diameter portion is disposed on the mouse side. And a step of bringing the small-diameter step portion of the hub wheel into contact with the shoulder portion of the outer joint member and fitting the hub wheel with the outer joint member; and a side surface on the outboard side of the wheel mounting flange A step of supporting the mandrel and the cradle, and the large-diameter portion of the mandrel passes through the inner diameter of the fitting portion of the outer joint member. The drive wheel bearing device manufacturing method according to claim 1, wherein the hub wheel and the outer joint member are integrally plastically joined by causing the fitting portion to bite into the uneven portion of the hub wheel. By fixing the mandrel and raising the cradle, the fitting portion of the outer joint member is expanded in diameter so that it is bitten into the uneven portion of the hub wheel, and the hub wheel and the outer joint member are integrally plasticized. The manufacturing method of the bearing apparatus for drive wheels of Claim 1 couple | bonded. The diameter of the fitting portion of the outer joint member is increased by pulling out the lower end portion of the mandrel so as to bite into the uneven portion of the hub wheel, and the hub wheel and the outer joint member are integrally plastically bonded. The manufacturing method of the bearing apparatus for drive wheels of description. The drive wheel bearing according to any one of claims 1 to 3, wherein a lubricating film is formed in advance at least on the inner diameter of the fitting portion among the inner diameter of the fitting portion of the outer joint member and the surface of the mandrel, and the mandrel is penetrated. Device manufacturing method. The drive wheel bearing according to any one of claims 1 to 3, wherein a lubricant is applied in advance to at least the inner diameter of the fitting portion among the inner diameter of the fitting portion of the outer joint member and the surface of the mandrel. Device manufacturing method. 6. One of the first to fifth aspects, wherein one inner rolling surface of the double row rolling bearing is formed directly on the outer peripheral surface of the hub wheel, and the other inner rolling surface is formed directly on the outer peripheral surface of the outer joint member. A method for manufacturing a bearing device for a drive wheel according to claim 1. The manufacturing method of the bearing apparatus for drive wheels in any one of the Claims 1 thru | or 6 which planted the hub bolt previously in the said wheel mounting flange. The manufacturing method of the bearing apparatus for drive wheels in any one of the Claims 1 thru | or 7 which finish-cut the side surface by the side of the outboard of the said wheel mounting flange after the said plastic joining. The method for manufacturing a bearing device for a drive wheel according to any one of claims 1 to 8, wherein a pilot portion of a brake rotor is formed on the wheel mounting flange, and the pilot portion is finish-cut after the plastic coupling.

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