JP4090714B2 - Wheel bearing device and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wheel bearing device that rotatably supports driving wheels of an automobile (front wheels of FF vehicles, rear wheels of FR vehicles, and all wheels of 4WD vehicles) with respect to a vehicle body, and a method for manufacturing the same.
[0002]
[Prior art]
Various types of bearing devices for driving wheels of automobiles have been proposed depending on the application. For example, in the drive wheel bearing device shown in FIG. 9, the hub wheel 1 and the double-row bearing 2 are unitized, and the outer joint member 4 of the constant velocity universal joint 3 is press-fitted to the inner periphery of the hub wheel 1 so that torque can be transmitted. The structure is provided.
[0003]
The bearing 2 is a double-row angular contact ball bearing in which a main part is constituted by a double-row outer race 5 and an inner race 7 and double-row rolling elements 9 and 10 incorporated between the outer race 6 and the inner race 8. In this bearing device, of the double row inner races 7, 8, one inner race 7 is directly formed on the outer peripheral surface of the hub wheel 1, and the other inner race 8 is fitted to the small-diameter end portion 11 of the hub wheel 1. Formed on the outer peripheral surface of the inner ring 12. The double row outer races 5 and 6 are formed on the inner peripheral surface of the outer ring 13.
[0004]
The hub wheel 1 has a wheel mounting flange 14 for mounting a wheel (not shown), and hub bolts 15 for fixing a wheel disc are implanted at equal intervals in the circumferential direction of the wheel mounting flange 14. Yes. The outer ring 13 has a vehicle body mounting flange 16 for mounting to a vehicle body (not shown), and the vehicle body mounting flange 16 is fixed to a knuckle extending from a suspension device of the vehicle body with bolts.
[0005]
A pair of seals 17 and 18 that seal the annular space between the outer ring 13, the hub ring 1, and the inner ring 12 are fitted into the inner diameter of the end of the outer ring 13 and filled in the opening at both ends of the bearing 2. It prevents the leakage of grease and the entry of water and foreign matters from the outside.
[0006]
In this bearing device, the inner ring 12 is fitted to the outer periphery of the small-diameter end portion 11 of the hub wheel 1 and the small-diameter end portion 11 of the hub wheel 1 is crimped by plastic deformation to form a double row with the hub wheel 1. The bearing 2 is unitized, and the caulking portion 19 and the inboard side end face 20 of the inner ring 12 are engaged to prevent the inner ring 12 from being detached and to manage the preload of the bearing 2. The caulking of the small-diameter end portion 11 of the hub wheel 1 is performed as shown in FIGS. 10 (a) and 10 (b). FIG. 10A shows a state before caulking, and FIG. 10B shows a state after caulking. In the state where the inner ring 12 is press-fitted into the hub wheel 1 as shown in FIG. 10A, the small-diameter end portion 11 of the hub wheel 1 is caulked with a swinging punch 21 as shown in FIG. ing.
[0007]
As shown in FIG. 9, the constant velocity universal joint 3 includes a mouth portion 22 containing an inner joint member, a ball, and a cage, and extends integrally from the mouth portion 22 in the axial direction, and a serration portion 24 is formed on the outer peripheral surface. The outer joint member 4 including the shaft portion 23 is provided. The shaft portion 23 of the outer joint member 4 is inserted into the through hole 26 of the hub wheel 1, and both are fitted by serration portions 24 and 25 formed on the outer peripheral surface of the shaft portion 23 and the inner peripheral surface of the through hole 26. The constant velocity universal joint 4 is fixed to the hub wheel 1 by enabling torque transmission and tightening the shaft end with a nut 27.
[0008]
In this bearing device, the caulking portion 19 of the hub wheel 1 and the inboard side end surface 20 of the inner ring 12 are engaged to prevent the inner ring 12 from being detached and to manage the preload of the bearing 2. Since the preload management is performed by caulking the small-diameter end portion 11 of the hub wheel 1, it is not necessary to perform the preload management of the bearing 2 with the tightening force of the outer joint member 4 by the nut 27, and the outer joint member 4 is a hub wheel. It is fixed with a nut 27 to such an extent that it does not come off from 1.
[0009]
[Problems to be solved by the invention]
By the way, in the bearing device, the shaft portion 23 of the outer joint member 4 is press-fitted into the through hole 26 of the hub wheel 1 with respect to the unitized hub wheel 1 and the bearing 2 and is fitted by the serration portions 24 and 25. The outer joint member 4 is fastened and fixed to the hub wheel 1 with a nut 27. In this structure, the caulking portion 19 formed on the small-diameter end portion 11 of the hub wheel 1 is brought into contact with the shoulder portion 28 of the outer joint member 4. At this time, the outer joint member 4 of the caulking portion 19 is in contact with the shoulder portion 28. Since the contact surface with the shoulder portion 28 is not a flat surface, when the shaft portion 23 of the outer joint member 4 is fastened to the hub wheel 1 with the nut 27, the shoulder portion 28 of the outer joint member 4 and the hub wheel 1 are added. There is a high possibility that the tightening portion 19 is worn, and there is a risk of rattling.
[0010]
Further, in the structure in which the hub wheel 1 and the bearing 2 are unitized by plastically deforming the small-diameter end portion 11 of the hub wheel 1 by swinging caulking to form the caulking portion 19, the portion of the caulking portion 19 is divided. Therefore, the axial dimension of the hub wheel 1 is only required, and the axial dimension of the entire bearing device is increased, making it difficult to make it compact.
[0011]
Therefore, the present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to reduce the backlash by coupling the hub wheel and the constant velocity universal joint, thereby increasing the rigidity of the bearing device, and to achieve a compact bearing device. Is to provide.
[0012]
[Means for Solving the Problems]
As technical means for achieving the above object, a bearing device according to the present invention comprises a hub wheel and a double row bearing as a unit, and the outer joint member of a constant velocity universal joint is connected to the hub ring via a torque transmission means. In the inner race of the double row bearing, the inner race on the inboard side is formed in a separate inner ring fitted on the outer periphery of the small-diameter end of the hub wheel, and the hub The plastic deformation portion located on the inboard side of the outer periphery of the small-diameter end of the ring is made smaller in diameter than the portion located on the outboard side, and irregularities are formed on the portion located on the inboard side of the inner circumference of the inner ring. The hub ring has a plastic deformed portion on the outer periphery of the hub ring that bites into the irregularities on the inner periphery of the inner ring by expanding the diameter from the inner diameter side without bending the plastic deformed portion of the hub ring to the radially outer diameter side. Connected to the inner ring by expanded caulking Is allowed, characterized in that the formation of the spigot by cutting radially inner diameter side of the plastically deformed portion of the hub wheel.
[0013]
Thus, the inner race on the inboard side of the inner race of the double row bearing is formed in a separate inner ring fitted to the outer periphery of the small-diameter end of the hub wheel, and the outer periphery or inner ring of the small-diameter end of the hub ring An irregularity is formed in one plastic deformation part of the inner circumference of the inner ring, and the plastic deformation part of the hub ring is expanded to the other plasticity by expanding from the inner diameter side without bending the plastic deformation part of the hub ring to the radial outer diameter side. The constant velocity universal joint of the constant velocity universal joint can be obtained with the inboard side end surface of the inner ring abutting against the shoulder of the outer joint member by encroaching the deformed portion and joining the hub ring and the inner ring by expansion caulking. The outer joint member can be fixed to the hub wheel with a nut or the like. Because the inboard side end face of the inner ring with which the shoulder part of the outer joint member abuts is a flat surface, even if the outer joint member is tightened to the hub wheel with a nut, the shoulder part of the outer joint member and the inboard side end face of the inner ring There will be no wear. In addition, since there is no conventional caulking portion by swing caulking between the shoulder portion of the outer joint member and the inboard side end surface of the inner ring, the axial dimension of the bearing device can be shortened. Further, by forming an in-wax by cutting on the radially inner side of the plastic deformation portion of the hub wheel, it becomes easy to realize a bearing device having high rigidity against moment load.
[0014]
Incidentally, it was bound by the small diameter end portion outer periphery or the inner ring of the inner periphery of one of the irregularities formed on the plastic deformation of the hub wheel by bite into the other of the plastic deformation portion enlarged crimping as described above By adopting the structure, the hub wheel and the inner ring can be unitized, and the inner ring is prevented from coming off and the bearing preload is managed by the enlarged diameter caulking portion.
[0016]
Also, the manufacturing method of the bearing device according to the present invention comprises a hub wheel and a double row bearing as a unit, and an outer joint member of a constant velocity universal joint is fitted into the hub wheel via a torque transmission means, and An inner race on the inboard side of the inner race of the bearings in the row is formed on a separate inner ring fitted to the outer periphery of the small-diameter end of the hub ring, and on the inboard side of the outer periphery of the small-diameter end of the hub ring. The plastic deformation portion is positioned with a smaller diameter than the portion located on the outboard side, and irregularities are formed in the portion located on the inboard side of the inner periphery of the inner ring , and the plastic deformation portion of the hub ring is radially outward. After connecting the hub ring and the inner ring by expanding and caulking by enlarging the plastic deformation part of the outer periphery of the hub ring into the irregularities on the inner periphery of the inner ring by expanding the diameter from the inner diameter side without bending to the radial side The inner diameter of the joint at the small-diameter end of the hub wheel. Cutting the dimensions, it is characterized in that so as to form a spigot radially inner diameter side of the plastically deformed portion of the hub wheel.
[0017]
After thus bound by diameter caulking the hub wheel and an inner ring, cutting the inner diameter of the coupling portion of the small-diameter end portion of the hub wheel to a predetermined size, by forming the spigot between the outer joint member For example, the in-row can be easily formed.
[0018]
In the above method, after binding the diameter caulking the hub wheel and an inner ring, to form a serrated portion on the inner diameter of the hub wheel, it is desirable to let fitted into the outer joint member. This is the case of bonding by diameter caulking the hub wheel and an inner ring, an inner diameter just below the junction of pre-expanded caulking must be smaller in diameter than the other portions, the serrations on the inner diameter of the hub This is because it is difficult to form in advance. Here, the serration unit includes splines other than serrations.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The drive wheel bearing device of the embodiment shown in FIG. 1 includes a hub wheel 101, a double row bearing 2, and a constant velocity universal joint 3 as main components. Here, the side closer to the outside of the vehicle when assembled to the vehicle is the outboard side (left side in the figure), and the side closer to the center of the vehicle is the inboard side (right side in the figure).
[0020]
The bearing 2 is a double-row angular contact ball bearing in which a main part is constituted by a double-row outer race 5 and an inner race 7 and double-row rolling elements 9 and 10 incorporated between the outer race 6 and the inner race 8. In this bearing device, of the double row inner races 7, 8, one inner race 7 is formed directly on the outer peripheral surface of the hub wheel 101, and the other inner race 8 is fitted to the small-diameter end 111 of the hub wheel 101. Formed on the outer peripheral surface of the inner ring 112. The double row outer races 5 and 6 are formed on the inner peripheral surface of the outer ring 13.
[0021]
The hub wheel 101 has a wheel mounting flange 14 for mounting a wheel (not shown), and hub bolts 15 for fixing a wheel disk are implanted at equal intervals in the circumferential direction of the wheel mounting flange 14. Yes. The outer ring 13 has a vehicle body mounting flange 16 for mounting to a vehicle body (not shown), and the vehicle body mounting flange 16 is fixed to a knuckle extending from a suspension device of the vehicle body with bolts.
[0022]
A pair of seals 17 and 18 that seal the annular space between the outer ring 13, the hub ring 101, and the inner ring 112 are fitted into the inner diameter of the end of the outer ring 13 and filled in the openings at both ends of the bearing 2. It prevents the leakage of grease and the entry of water and foreign matters from the outside.
[0023]
In this bearing device, after the inner ring 112 is fitted to the outer periphery of the small-diameter end portion 111 of the hub wheel 101, the small-diameter end portion 111 of the hub ring 101 is plastically deformed by expanding and caulking, and the hub ring 101 is deformed. Both are coupled by a plastic deformation portion 130 formed between the small-diameter end portion 111 and the inner ring 112. The hub wheel 101 and the double-row bearing 2 are unitized by the plastic deformation portion 130 by this diameter expansion caulking, and the plastic deformation portion 130 prevents the inner ring 112 from coming off and manages the preload of the bearing 2.
[0024]
The diameter-expanding caulking of the small-diameter end 111 of the hub wheel 101 forms an unevenness 131 (the formation range of the unevenness 131 is indicated by an x mark) on the outer peripheral surface of the small-diameter end 111 of the hub wheel 101, for example. The unevenness 131 is caused to penetrate into the inner peripheral surface of the inner ring 112 by expanding the diameter of the small-diameter end portion 111 from the inner diameter side, and the hub ring 101 and the inner ring 112 are joined by plastic deformation.
[0025]
In addition, the shape of this unevenness | corrugation 131 is arbitrary, The thing (serration or spline) etc. which formed the tooth | gear of the axial direction in multiple places of the circumferential direction other than knurled shape can also be employ | adopted. Further, the unevenness is formed on the inner peripheral surface of the inner ring 112, and the unevenness is bitten into the outer peripheral surface of the small-diameter end portion 111 by expanding the diameter from the inner diameter side of the small-diameter end portion 111 of the hub wheel 101. May be combined by plastic deformation.
[0026]
For this diameter expansion caulking, as shown in FIG. 2, the inner diameter φd ₂ of the coupling portion 132 obtained by coupling the small-diameter end portion 111 of the hub wheel 101 and the inner ring 112 by plastic deformation is set to the outboard side portion (serration formation). It is necessary to set it smaller than the inner diameter φd ₁ of the planned portion).
[0027]
As described above, since the inner diameter φd ₂ of the coupling portion 132 of the hub wheel 101 and the inner ring 112 is smaller than the inner diameter φd _{1 of the} outboard side portion (the serration formation scheduled portion), a serration portion is previously formed on the inner peripheral surface of the hub wheel 101. It is difficult to keep. Therefore, as shown in FIG. 3, after the diameter expansion caulking in which the hub ring 101 and the inner ring 112 are joined by plastic deformation, the inner diameter portion (cross-hatched portion in the figure) of the hub ring 101 is turned, As shown in FIG. 4, the serration portion 25 is formed on the inner peripheral surface of the hub wheel 101 by broaching.
[0028]
The constant velocity universal joint 3 includes a mouth portion 22 that houses an inner joint member, a ball, and a cage, and a shaft portion 23 that extends integrally from the mouth portion 22 in the axial direction and has a serration portion 24 formed on the outer peripheral surface thereof. It has the outer joint member 4 which consists of these. The shaft portion 23 of the outer joint member 4 is inserted into the through hole 26 of the hub wheel 101, and both are fitted by serration portions 24 and 25 formed on the outer peripheral surface of the shaft portion 23 and the inner peripheral surface of the through hole 26. The constant velocity universal joint 3 is fixed to the hub wheel 101 by enabling torque transmission and tightening the shaft end with a nut 27.
[0029]
In this bearing device, the plastic deformation portion 130 between the hub ring 101 and the inner ring 112 prevents the inner ring 112 from coming off and preload management of the bearing 2. In particular, the preload management of the bearing 2 is performed by increasing the diameter of the hub ring 101. Since it is performed by the plastic deformation portion 130 by tightening, it is not necessary to perform preload management of the bearing 2 with the tightening force of the outer joint member 3 by the nut 27, and the outer joint member 4 is not removed from the hub wheel 101. 27 is fixed.
[0030]
As described above, the hub ring 101 and the inner ring 112 are joined by the plastic deformation portion 130 by expanding and caulking, so that the inboard side end surface 120 of the inner ring 112 fitted to the small-diameter end portion 111 of the hub ring 101 is outside. The shaft portion 23 of the outer joint member 4 can be fixed to the hub wheel 101 with the nut 27 in a state where the shoulder portion 28 is in contact with the joint member 4. Since the inboard-side end surface 120 of the inner ring 112 with which the shoulder portion 28 of the outer joint member 4 abuts is a flat surface, even if the shaft portion 23 of the outer joint member 4 is fastened to the hub wheel 101 with the nut 27, the outer joint Wear does not occur on the shoulder 28 of the member 4 and the inboard side end surface 120 of the inner ring 112. Further, since there is no swaged portion by the conventional swing swaging between the inboard side end surface 120 of the inner ring 112 and the shoulder portion 28 of the outer joint member 4, the axial dimension of the bearing device can be shortened. Can do.
[0031]
Further, between the shoulder portion 28 and the serration portion 24 of the outer joint member 4, the inner diameter of the hub wheel 101 is turned after the diameter expansion caulking of the hub wheel 101, whereby the inner diameter of the hub wheel 101 and the outer joint member 4. An in-row 133 is formed between the outer diameter. By forming the in-row 133 with the hub wheel 101 and the outer joint member 4 in this way, it becomes easy to realize a bearing device having high rigidity against moment load.
[0032]
FIG. 5 shows another embodiment of the present invention, and the formation position of the plastic deformation portion 230 of the hub ring 201 and the inner ring 212 by the diameter expansion caulking is different from the embodiment of FIG. That is, in the embodiment of FIG. 1, the inner ring 112 is fitted to the outer peripheral surface of the small-diameter end portion 111 of the hub wheel 101, and the small-diameter end portion 111 of the hub ring 101 disposed on the inner diameter side of the inner ring 112 is expanded. This is a case where the plastic deformation portion 130 between the hub wheel 101 and the inner ring 112 is formed at the inboard side position by crimping.
[0033]
On the other hand, in the embodiment of FIG. 5, the outboard side of the inner ring 212 is extended, the hub ring 201 is fitted to the outer peripheral surface of the extended small-diameter end portion 211, and the inner diameter side of the hub ring 201 is A structure in which a plastic deformation portion 230 of the hub ring 201 and the inner ring 212 is formed at the position on the outboard side by expanding and caulking the small-diameter end portion 211 of the inner ring 212 disposed on the outer ring 212 is provided.
[0034]
In the embodiment of FIG. 5 as well, as in the embodiment of FIG. 1, the small-diameter end portion 211 of the inner ring 212 is plastically deformed by enlarging and formed between the small-diameter end portion 211 of the inner ring 212 and the hub ring 201. Both are joined by the plastic deformation part 230 made. The hub ring 201 and the double-row bearing 2 are unitized by the plastic deformation portion 230 by this diameter expansion caulking, and the plastic deformation portion 230 prevents the inner ring 212 from coming off and manages the preload of the bearing 2.
[0035]
The diameter-enlarged caulking of the small-diameter end 211 of the inner ring 212 is performed by forming irregularities 231 such as knurling on the outer peripheral surface of the small-diameter end 211 of the inner ring 212 (the formation range of the irregularities 231 is indicated by x). The unevenness 231 is digged into the inner diameter surface of the hub wheel 201 by expanding the diameter of the small diameter end portion 211 from the inner diameter side, and the hub wheel 201 and the inner ring 212 are joined by plastic deformation. For this diameter expansion caulking, as shown in FIG. 6, the inner diameter φd ₂ of the coupling portion 232 in which the hub ring 201 and the small diameter end portion 211 of the inner ring 212 are joined by plastic deformation is changed to the inner diameter φd of the inboard side portion. Must be set smaller than ₁ .
[0036]
Thus, since the inner diameter φd ₂ of the coupling portion 232 between the hub wheel 201 and the inner ring 212 is smaller than the inner diameter φd ₁ of the inboard side portion, it is difficult to previously form the serration portion 25 on the inner peripheral surface of the inner ring 212. Therefore, as shown in FIG. 7, after the diameter expansion caulking in which the hub ring 201 and the inner ring 212 are joined by plastic deformation, the inner diameter of the inner ring 212 (cross-hatched portion in the figure) is turned, and then FIG. As shown, the serration portion 25 is formed on the inner peripheral surface of the inner ring 212 by broaching.
[0037]
Also in this embodiment, the hub ring 201 and the inner ring 212 are joined by the plastic deformation portion 230 by expanding and caulking, so that the inboard side end surface 220 of the inner ring 212 is brought into contact with the shoulder portion 28 of the outer joint member 4. In this state, the shaft portion 23 of the outer joint member 4 of the constant velocity universal joint 3 can be fixed to the hub wheel 201 by the nut 27. Since the inboard-side end surface 220 of the inner ring 212 with which the shoulder portion 28 of the outer joint member 4 abuts is a flat surface, the outer joint member 4 can be secured even if the shaft portion 23 of the outer joint member 4 is fastened to the hub wheel 201 with the nut 27. Wear does not occur on the shoulder 28 of the member 4 and the inboard side end face 220 of the inner ring 212. In addition, since there is no swaged portion by conventional swing swaging between the inboard side end surface 220 of the inner ring 212 and the shoulder portion 28 of the outer joint member 4, the axial dimension of the bearing device can be shortened. Can do.
[0038]
Further, between the shoulder portion 28 of the outer joint member 4 and the serration portion 24, an inlay 233 is formed between the inner diameter of the inner ring 212 and the outer diameter of the shaft portion 23 of the outer joint member 4. By forming the in-row 233 with the inner ring 212 and the outer joint member 4 in this way, it becomes easy to realize a bearing device having high rigidity against moment load.
[0039]
【The invention's effect】
According to the present invention, the inner race on the inboard side of the inner race of the double row bearing is formed in a separate inner ring fitted to the outer periphery of the small-diameter end portion of the hub ring , and the small-diameter end portion of the hub ring is formed . Concavities and convexities are formed on either the outer periphery or the inner periphery of the inner ring , and the plastic deformation portion of the hub ring is not bent to the radially outer diameter side, and the unevenness is increased by expanding the diameter from the inner diameter side. by conjugated by diameter caulking and the hub wheel and the inner ring by bite into the other of the plastic deformation portion, in a state where the inner ring of the inboard side end face is brought into contact with the shoulder portion of the outer joint member, the constant velocity The outer joint member of the universal joint can be fixed to the hub wheel with a nut or the like.
[0040]
As a result, since the inboard side end surface of the inner ring with which the shoulder portion of the outer joint member abuts is a flat surface, even if the shaft portion of the outer joint member is tightened to the hub wheel with a nut, the shoulder portion of the outer joint member No wear occurs on the end face of the inner ring on the inboard side. Further, since there is no conventional caulking portion by swing caulking between the inboard side end surface of the inner ring and the shoulder portion of the outer joint member, the axial dimension of the bearing device can be shortened. From the above, it is possible to provide a compact bearing device by eliminating backlash by coupling the hub wheel and the constant velocity universal joint to increase the rigidity of the bearing device.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a wheel bearing device according to an embodiment of the present invention, including a part of the drive wheel bearing device that is partially omitted.
FIG. 2 is an enlarged cross-sectional view of a main part showing a diameter caulking portion between the hub wheel and the inner ring of FIG. 1;
FIG. 3 is an enlarged cross-sectional view of a main part for explaining a procedure for turning an inner diameter of the hub wheel of FIG. 2;
4 is an enlarged cross-sectional view of a main part showing a state in which a serration portion is formed on the inner peripheral surface of the hub wheel of FIG. 3;
FIG. 5 is a cross-sectional view including a partially omitted portion of the drive wheel bearing device in another embodiment of the wheel bearing device according to the present invention.
6 is an enlarged cross-sectional view of a main part showing an enlarged diameter caulking portion between the hub wheel and the inner ring of FIG. 5;
7 is an enlarged cross-sectional view of a main part for explaining a procedure for turning the inner diameter of the hub wheel of FIG. 6. FIG.
8 is an essential part enlarged cross-sectional view showing a state in which serrations are formed on the inner peripheral surface of the hub wheel of FIG.
FIG. 9 is a sectional view showing a driving wheel bearing device in a conventional wheel bearing device.
10A is a cross-sectional view showing a state before swing caulking of the small-diameter end portion of the hub wheel in manufacturing the bearing device of FIG. 9, and FIG. It is sectional drawing which shows the state after fastening.
[Explanation of symbols]
2 Double-row bearing 3 Constant velocity universal joint 4 Outer joint member 7, 8 Inner race 101, 201 Hub ring 112, 212 Inner ring 130, 230 Plastic deformation part 131, 231 Unevenness 133, 233 Inrow

Claims (3)

In a wheel bearing device in which a hub wheel and a double row bearing are unitized and an outer joint member of a constant velocity universal joint is fitted into the hub wheel via a torque transmission means, the inner race of the double row bearing An inner race on the inboard side is formed on a separate inner ring fitted to the outer periphery of the small-diameter end portion of the hub wheel, and the plastic deformation portion located on the inboard side of the outer periphery of the small-diameter end portion of the hub wheel is It has a smaller diameter than the part located on the board side, forms irregularities in the part located on the inboard side of the inner circumference of the inner ring, and the inner diameter without bending the plastic deformation part of the hub ring to the radially outer diameter side. The diameter of the plastic deformation portion of the hub ring is obtained by enlarging the plastic deformation portion of the outer periphery of the hub ring into the unevenness of the inner periphery of the inner ring by expanding the diameter from the side, and connecting the hub ring and the inner ring by expansion caulking. An inlay by cutting on the inner diameter side Wheel bearing device is characterized in that form. A hub wheel and a double row bearing are unitized, and an outer joint member of a constant velocity universal joint is fitted into the hub wheel via a torque transmission means, and an inner side of the inner race of the double row bearing is arranged on the inboard side. The race is formed on a separate inner ring fitted to the outer periphery of the small-diameter end of the hub wheel, and the plastic deformation portion located on the inboard side of the outer periphery of the small-diameter end of the hub wheel is positioned on the outboard side. a smaller diameter than the site, thereby forming irregularities on site located on the inner periphery of the inboard side of the inner ring without bending the plastically deformed portion of the hub wheel radially outer diameter, diameter of the inner diameter side Thus, after the plastic deformation portion of the outer periphery of the hub ring is bitten into the unevenness of the inner periphery of the inner ring and the hub ring and the inner ring are coupled by expanding and caulking, the inner diameter of the coupling portion of the small-diameter end of the hub ring the cutting to a predetermined size, the plastic deformation portion of the hub wheel Method of manufacturing a wheel bearing device is characterized in that the radial inner diameter side so as to form a spigot. 3. The wheel according to claim 2 , wherein after the hub ring and the inner ring are joined by expanding and caulking, a serration portion is formed on an inner diameter of the hub ring and the outer joint member is fitted inside. Manufacturing method of bearing device.

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