JP2007153247A - Wheel bearing system and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-weight compact wheel bearing system of the fourth generation in which a looseness at its connecting part is prevented and its durability is kept for a long period of time. <P>SOLUTION: There is provided a wheel bearing system in which the end part of a shaft 20 of an outer bearing member 14 is deformed in a plastic manner in a radial outer direction, fastened at the end surface 28 of a hub wheel 1 and the outer bearing member 14 is axially fixed by a fastening part 21 against the hub wheel 1. A serration 1c of the hub wheel 1 is processed with a high-frequency induction hardening to form a predetermined hardening layer 11 within a surface hardening range of HRC 58 to 64 and at the same time a serration 20b at the shaft 20 is kept in its unhardened state, the shaft 20 is formed into a cylindrical shape, a diameter widening tool is pushed into its inner diameter part to cause the serration 20b of the shaft 20 to be expanded at its diameter part. Since a looseness at the engagement part with the serration 1c is prohibited, a uniform looseness prevention state can be attained over the entire engagement part and a fretting can be effectively prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like, and more particularly, a wheel bearing device having a fourth generation structure which is light and compact and improves the durability of a coupling portion, and a method for manufacturing the same. It is about.

  Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like is such that a hub wheel for mounting a wheel is rotatably supported via a rolling bearing, and has a desired bearing rigidity, and also against misalignment. Double row angular contact ball bearings exhibiting durability and low rotational torque are frequently used from the viewpoint of improving fuel efficiency.

  Further, the wheel bearing device has a structure called a first generation in which a wheel bearing composed of a double row angular ball bearing or the like is fitted between a knuckle and a hub wheel constituting a suspension device. The second generation structure in which the body mounting flange or the wheel mounting flange is directly formed on the outer periphery of the member, and the third generation structure in which one inner rolling surface is directly formed on the outer periphery of the hub wheel are mass-produced. Furthermore, a fourth generation structure has been developed that is lighter and more compact by directly forming inner rolling surfaces on the outer periphery of the outer joint member of the hub wheel and the constant velocity universal joint, and is about to be introduced into the market.

  As this fourth-generation wheel bearing device, one shown in FIG. 3 is known. In this wheel bearing device, a hub wheel 50, a double row rolling bearing 51, and a constant velocity universal joint 52 are unitized. The double-row rolling bearing 51 has a vehicle body mounting flange 53b integrally attached to a knuckle (not shown) on the outer periphery, and an outer side in which double-row outer rolling surfaces 53a and 53a are formed on the inner periphery. A member 53 and a wheel mounting flange 54 for mounting a wheel (not shown) at one end are integrally provided, and one inner rolling surface 50a facing the double row outer rolling surfaces 53a and 53a on the outer periphery. The hub wheel 50 in which a small-diameter step portion 50b extending in the axial direction from the inner rolling surface 50a is formed, and the small-diameter step portion 50b of the hub wheel 50 are fitted into the double-row outer rolling surfaces 53a and 53a. An inner member 56 composed of an outer joint member 55 formed with the other inner rolling surface 55a facing each other, double rows of balls 57, 57 accommodated between both rolling surfaces, and these double rows of balls 57 , 57 to hold the roller freely Is composed of a double row angular contact ball bearing having an 8 and 58. On the outer periphery of the hub wheel 50, a predetermined hardened layer is formed by induction hardening over the end face of the inner rolling surface 50a and the small-diameter stepped portion 50b from the seal land portion where the outer seal 65 is in sliding contact.

  The constant velocity universal joint 52 includes an outer joint member 55, a joint inner ring 59, a cage 60, and a torque transmission ball 61. The outer joint member 55 includes a cup-shaped mouth portion 62 and a shoulder that forms the bottom portion of the mouth portion 62. A portion 63 and a shaft portion 64 extending in the axial direction from the shoulder portion 63 are integrally provided. A serration 64a is formed on the outer periphery of the shaft portion 64, and engages with a serration 50c formed on the inner periphery of the hub wheel 50 so that torque can be transmitted. Further, a predetermined hardened layer is formed on the outer periphery of the outer joint member 55 by induction quenching from the seal land portion in which the inner seal 65 is in sliding contact to the inner rolling surface 55a and the shaft portion 64.

  Seals 65, 65 are attached to the opening portion of the annular space formed between the outer member 53 and the inner member 56, and leakage of lubricating grease sealed inside the bearing and rainwater or the like inside the bearing from the outside. Prevents dust from entering.

  Further, the end portion of the shaft portion 64 of the outer joint member 55 is plastically deformed radially outward and is caulked (oscillating caulking) to the end surface 67 located in the pilot portion 66 of the hub wheel 50, and this caulking portion. The outer joint member 55 is fixed to the hub wheel 50 in the axial direction by 68, and the end face of the small diameter step portion 50b of the hub wheel 50 and the shoulder 63 of the outer joint member 55 are abutted to manage the bearing preload amount. .

Here, by forming at least a portion of the end surface 67 of the hub wheel 50 in contact with the caulking portion 68 to be radially outwardly inclined toward the outer side, the contact area of the caulking portion 68 is increased, The strength of the fastening portion 68 is improved.
JP 2002-356101 A

  In such a conventional wheel bearing device, in order to increase the strength of the caulking portion 68, at least a portion of the end surface 67 of the hub wheel 50 that contacts the caulking portion 68 is inclined outwardly in the radial direction. Forming and increasing the contact area of the crimping portion 68 is an effective means. However, if the engaging portions of the serrations 50c and 64a that transmit torque have a backlash in the rotational direction, not only will the vehicle run stability and feeling be adversely affected, but also fretting will proceed to the engaging portions. When a moment load or the like is applied, this backlash is amplified and the strength of the caulking portion 68 may be reduced.

  The present invention has been made in view of such circumstances, and is a fourth-generation wheel bearing device having a lightweight and compact structure, with a loose joint and a long-term durability. The object is to provide this manufacturing method.

  In order to achieve such an object, the invention according to claim 1 of the present invention is a wheel bearing device in which a hub wheel, a double row rolling bearing, and a constant velocity universal joint are unitized. The rolling bearing has an outer member in which a double row outer rolling surface is formed on the inner periphery, and a wheel mounting flange integrally formed at one end, and one end facing the outer rolling surface of the double row on the outer periphery. An inner rolling surface, a hub wheel formed with a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface, and the other inner rolling surface facing the double-row outer rolling surface on the outer periphery; An inner member made of an outer joint member of the constant velocity universal joint integrally formed with a shaft portion extending in the axial direction from the inner rolling surface, and between both rolling surfaces of the inner member and the outer member A plurality of rolling elements housed in a freely rotatable manner, and the shaft portion is fitted into the hub wheel via a serration. In addition, the end bearing is plastically deformed radially outward and crimped to the end surface of the hub wheel, and the outer joint member is fixed in the axial direction to the hub wheel by the crimped portion. The shaft portion is formed in a cylindrical shape, the serration of the shaft portion is enlarged, and the engaging portion with the serration of the hub wheel is loosely packed.

  Thus, in the wheel bearing device of the fourth generation structure in which the hub wheel and the outer joint member are unitized by the caulking portion formed by swing caulking, the shaft portion is formed in a cylindrical shape, The diameter of the serration of the shaft part is expanded and the engagement part with the serration of the hub wheel is filled with backlash. Therefore, the weight and compactness are improved, and the running stability and feeling of the vehicle are improved. It is possible to provide a wheel bearing device having a fourth generation structure that ensures durability.

  Preferably, as in the invention described in claim 2, a predetermined hardened layer is formed in the surface hardness of 58 to 64 HRC by induction hardening of the hub wheel, and the shaft portion is not serrated. If the quenching is left as it is, the serration can be expanded to easily and uniformly make the engagement portion with the serration of the hub ring loose.

  According to a third aspect of the present invention, there is provided a method for manufacturing a wheel bearing device in which a hub wheel, a double row rolling bearing and a constant velocity universal joint are unitized, wherein the double row rolling is provided. The bearing has an outer member in which a double row outer rolling surface is formed on the inner periphery, and a wheel mounting flange integrally formed at one end, and one inner side facing the double row outer rolling surface on the outer periphery. A rolling surface, a hub wheel formed with a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface, and the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, An inner member composed of an outer joint member of the constant velocity universal joint integrally formed with a shaft portion extending in the axial direction from the inner rolling surface, and between both rolling surfaces of the inner member and the outer member. A plurality of rolling elements accommodated in a freely rotatable manner, and the shaft portion is fitted into the hub wheel via a serration. In addition, the end bearing is plastically deformed radially outward and crimped to the end surface of the hub wheel, and the outer joint member is axially fixed to the hub wheel by the crimped portion. In the manufacturing method, the shaft portion is formed in a cylindrical shape, the end portion of the shaft portion is plastically deformed radially outward, and the end surface of the hub wheel is swung and swung with a crimping jig. Prior to the caulking step, the method includes a step of expanding the serration of the shaft portion by pushing a diameter expansion jig into the inner diameter of the shaft portion.

  In this way, the end of the shaft portion of the outer joint member is plastically deformed radially outward and crimped to the end surface of the hub wheel, and the outer joint member is fixed to the hub wheel in the axial direction by the crimped portion. In the method for manufacturing a wheel bearing device, the shaft portion is formed in a cylindrical shape, the end portion of the shaft portion is plastically deformed radially outward, and the end surface of the hub wheel is swung by a crimping jig. And before this caulking step, it is provided with a step of expanding the serration of the shaft portion by pushing a diameter expanding jig into the inner diameter of the shaft portion. While improving running stability and feeling, it is possible to ensure the strength and durability of the crimped portion over a long period of time and maintain the preload amount for a long period of time.

  Further, as in the invention described in claim 4, the shape before caulking at the end portion of the shaft portion gradually increases toward the tip so that the thickness of the tip portion is larger than the thickness of the root portion. If it is formed into a shape, the amount of meat that can be expanded by a caulking jig such as a punch in the initial stage of caulking increases, so the axial dimension for plastic deformation of the cylindrical portion of the hub wheel can be shortened, It is easy to satisfy the caulking jig shape at an early stage, and the outer joint member can be firmly fixed.

  A wheel bearing device according to the present invention is a wheel bearing device in which a hub wheel, a double row rolling bearing, and a constant velocity universal joint are unitized, and the double row rolling bearing has a double row on an inner periphery. An outer rolling surface formed with the outer rolling surface, a wheel mounting flange at one end, and an inner rolling surface facing the double row outer rolling surface on the outer periphery, and the inner rolling surface. A hub wheel formed with a cylindrical small-diameter stepped portion extending in the axial direction from the running surface, the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and the axial direction from the inner rolling surface An inner member composed of an outer joint member of the constant velocity universal joint integrally formed with a shaft portion extending in the direction of the shaft, and a plurality of rolls accommodated between both rolling surfaces of the inner member and the outer member. And the shaft portion is fitted into the hub wheel via serrations, and the end portion is radially outward In the wheel bearing device in which the outer joint member is fixed in the axial direction with respect to the hub wheel by the crimp portion, the shaft portion is formed in a cylindrical shape. In addition, since the serration of the shaft portion is expanded and the engagement portion with the serration of the hub wheel is loosely packed, the weight and size are reduced, and the running stability and feeling of the vehicle are improved. It is possible to provide a wheel bearing device having a fourth generation structure that ensures durability over a period of time.

  A method for manufacturing a wheel bearing device according to the present invention is a method for manufacturing a wheel bearing device in which a hub wheel, a double row rolling bearing, and a constant velocity universal joint are unitized, and the double row rolling bearing is provided. However, the outer member having a double-row outer rolling surface formed on the inner periphery and a wheel mounting flange at one end are integrally formed, and one inner rolling member facing the double-row outer rolling surface on the outer periphery. A running wheel, a hub wheel formed with a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface, and the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, An inner member composed of an outer joint member of the constant velocity universal joint integrally formed with a shaft portion extending in the axial direction from the inner rolling surface, and rolling between both rolling surfaces of the inner member and the outer member. A plurality of rolling elements accommodated in a freely movable manner, and the shaft portion is fitted into the hub wheel via a serration. In addition, the end bearing is plastically deformed radially outward and crimped to the end surface of the hub wheel, and the outer joint member is axially fixed to the hub wheel by the crimped portion. In the manufacturing method, the shaft portion is formed in a cylindrical shape, the end portion of the shaft portion is plastically deformed radially outward, and the end surface of the hub wheel is swung and swung with a crimping jig. Prior to the caulking step, there is a step of expanding the serration of the shaft portion by pushing a diameter-enlarging jig into the inner diameter of the shaft portion. It can be stuffed, can effectively prevent fretting, improve the running stability and feeling of the vehicle, ensure the strength and durability of the crimped part for a long time, and The preload amount can be maintained for a long time.

  A wheel bearing device in which a hub wheel, a double row rolling bearing, and a constant velocity universal joint are unitized, wherein the double row rolling bearing has an outer periphery formed with a double row outer rolling surface. And a cylindrical member extending in the axial direction from the inner rolling surface, and one inner rolling surface facing the outer rolling surface of the double row on the outer periphery. A hub wheel formed with a small diameter step portion, the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a shaft portion extending in the axial direction from the inner rolling surface are integrally formed. An inner member composed of an outer joint member of the constant velocity universal joint, and a double row of balls accommodated so as to roll freely between both rolling surfaces of the inner member and the outer member. Is fitted into the hub ring via serrations, and the end of the hub ring is plastically deformed radially outward. In the wheel bearing device in which the outer joint member is axially fixed to the hub wheel by the crimped portion, the serration of the hub ring is surface hardened to 58 to 64 HRC by induction hardening. A predetermined hardened layer is formed in the range, and the serration of the shaft part is left unquenched, the shaft part is formed in a cylindrical shape, and the shaft is formed by pushing a diameter expanding jig into the inner diameter. The diameter of the serration of the portion is expanded, and the engaging portion with the serration of the hub wheel is loosely packed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, and FIG. 2 is an explanatory view showing an assembly process of the wheel bearing device of FIG. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

  This wheel bearing device is referred to as a fourth generation, and includes a hub wheel 1, a double row rolling bearing 2 and a constant velocity universal joint 3 as a unit. The double-row rolling bearing 2 includes an outer member 4, an inner member 5, and double-row rolling elements (balls) 6 and 6. The inner member 5 includes a hub wheel 1 and an outer joint member 14 (described later) fitted in the hub wheel 1 so as to be able to transmit torque.

  The outer member 4 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and integrally has a vehicle body mounting flange 4b for mounting to a vehicle body (not shown) on the outer periphery. Arc-shaped double-row outer rolling surfaces 4a and 4a are formed. The double row outer rolling surfaces 4a, 4a are hardened by induction hardening to a surface hardness of 58 to 64 HRC.

  On the other hand, the hub wheel 1 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and has a wheel mounting flange 7 for mounting a wheel to an end portion on the outer side. A plurality of hub bolts 8 are planted at equal intervals in the circumferential direction. Also, on the outer periphery of the hub wheel 1, one (outer side) arcuate inner rolling surface 1a facing the double row outer rolling surfaces 4a, 4a, and an axial direction from the inner rolling surface 1a. An extending cylindrical small-diameter step portion 1b is formed, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. Then, the surface hardness is set to 58 to 64 HRC by induction hardening from the seal land portion 7a in which the outer peripheral seal 10 is in sliding contact with the inner peripheral serration 1c portion to the inner rolling surface 1a and the end surface of the small diameter step portion 1b. Predetermined hardened layers 11 and 12 are formed in the range. As a result, not only the wear resistance of the seal land 7a which is the base of the serration 1c and the wheel mounting flange 7 is improved, but also sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 7 is obtained. In addition, the durability of the hub wheel 1 is improved.

  The constant velocity universal joint 3 includes an outer joint member 14, a joint inner ring 15, a cage 16, and a torque transmission ball 17. The outer joint member 14 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and has a cup-shaped mouth portion 18, a shoulder portion 19 that forms the bottom portion of the mouth portion 18, and the shoulder portion 19. And a cylindrical shaft portion 20 extending in the axial direction are integrally formed. The shaft portion 20 includes an inrow portion 20a that is cylindrically fitted to the small-diameter step portion 1b of the hub wheel 1 through a predetermined radial clearance, and a serration (or spline) that engages the serration 1c of the hub wheel 1 on the outer periphery. 20b is formed. The end surface of the small-diameter step portion 1b abuts against the shoulder portion 19 by the crimping portion 21 formed by plastically deforming the end portion of the shaft portion 20 in the radially outward direction. The joint member 14 is integrally plastically coupled.

  Further, a curved track groove 18a extending in the axial direction is formed on the inner periphery of the mouth portion 18, and a track groove 15a corresponding to the track groove 18a is formed on the outer periphery of the joint inner ring 15, and both the track grooves are formed. A torque transmission ball 17 is accommodated via a cage 16 between 18a and 15a. Further, the other (inner side) arcuate inner rolling surface 14a is formed on the outer periphery of the shoulder 19 so as to face the double row outer rolling surfaces 4a, 4a. Then, the surface hardness is set in the range of 58 to 64 HRC by induction hardening from the track land 18a and the seal land portion 19a in which the inner seal 10 is in sliding contact to the inner rolling surface 14a and the inner wax portion 20a of the shaft portion 20. Predetermined hardened layers 22 and 23 are formed. As a result, not only the wear resistance of the track groove 18a and the seal land portion 19a is improved, but also the mechanical strength is sufficient with respect to the applied rotational bending load, and the durability of the outer joint member 14 is improved. .

  Double row rolling elements 6 and 6 are accommodated between the double row outer raceway surfaces 4a and 4a of the outer member 4 and the double row inner raceway surfaces 1a and 14a opposed to these, and the cage 9, 9 is held by a roller 9. Further, seals 10 and 10 are attached to the end portion of the outer member 4 to prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like into the bearing from the outside. These double-row rolling bearings 2 are so-called back-to-back type double-row angular bearings in which the action lines of the acting directions of the forces applied to the rolling surfaces 4a, 1a and 4a, 14a are separated in the axial direction as they approach the axial center. It constitutes a ball bearing. Here, a double-row angular contact ball bearing using balls as the rolling elements 6 is illustrated, but the wheel bearing device according to the present invention is not limited to this, and a double-row conical roller using tapered rollers as the rolling elements 6. It may be a roller bearing.

  End caps 24 and 25 are attached to the opening end of the hub wheel 1 and the inner periphery of the shaft portion 20 to prevent rainwater or the like from entering the plastic coupling portion and rusting the portion. It prevents the grease sealed inside from flowing out.

Next, a method of unitizing the hub wheel 1, the double row rolling bearing 2 and the constant velocity universal joint 3 will be described in detail with reference to FIGS. 2 (a) and 2 (b).
First, as shown in FIG. 2A, the double-row rolling elements 6 and 6 are temporarily assembled to the double-row outer rolling surfaces 4a and 4a of the outer member 4 via the cages 9 and 9, respectively. The seals 10 and 10 are attached to both ends of the outer member 4. Next, the hub wheel 1 and the outer joint member 14 are inserted from both sides of the outer member 4, and the shoulder portion 19 of the outer joint member 14 is brought into contact with the end surface of the small-diameter stepped portion 1 b of the hub wheel 1 to be in a butted state. The shaft portion 20 of the outer joint member 14 is internally fitted to the hub wheel 1 through the serrations 1c and 20b until it becomes. Then, a diameter expansion jig 26 such as a mandrel is pushed into the inner diameter of the shaft portion 20 to increase the diameter of the serration 20b, and the engagement portion between the serration 1c of the hub wheel 1 and the serration 20b is stuffed. Thereby, backlash can be uniformly performed over the entire engaging portion, and fretting can be effectively prevented.

  Thereafter, as shown in FIG. 2 (b), the end portion of the shaft portion 20 is plastically deformed radially outward, and is swung by the crimping jig 29 on the end surface 28 located in the pilot portion 27 of the hub wheel 1. The outer joint member 14 is fixed to the hub wheel 1 in the axial direction by the caulking portion 21. Further, by this rocking caulking, the end face of the small-diameter stepped portion 1b of the hub wheel 1 and the shoulder portion 19 of the outer joint member 14 are brought into contact with each other, and the bearing portion is managed to a predetermined preload amount. By adopting such a manufacturing method, the rattling of the engaging portions of the serrations 1c and 20b is reduced, the running stability and feeling of the vehicle are improved, and the strength and durability of the crimped portion 21 are improved over a long period of time. It can be secured and the preload amount can be maintained for a long time.

  Here, if the shape before caulking at the end portion of the shaft portion 20 is formed into a shape that gradually increases toward the tip so that the thickness of the tip portion is larger than the thickness of the root portion, the caulking process Since the amount of meat that is spread by the clamping jig 29 such as a punch increases in the initial stage, the axial dimension for plastic deformation can be shortened, and the shape of the clamping jig can be easily satisfied at an early stage. The outer joint member 14 can be firmly fixed (see FIG. 2A).

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The wheel bearing device according to the present invention can be applied to a wheel bearing device having a fourth generation structure in which a hub wheel, a double row rolling bearing, and a constant velocity universal joint are unitized.

It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. (A) is explanatory drawing which shows the diameter expansion process of the wheel bearing apparatus of FIG. (B) is explanatory drawing which shows a rocking caulking process same as the above. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a, 14a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 1b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Small diameter step 1c, 20b ... Serration 2 ... Double row rolling bearing 3 ...・ ・ ・ ・ ・ ・ ・ ・ Constant velocity universal joint 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 4a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Outer rolling surface 4b ... Body mounting flange 5 ... Inner member 6 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 7a, 19a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal land 8・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hold 10 ... Seal 11, 12, 22, 23 ... Hardened layer 14 ... Outer joint Member 15 ... Joint inner ring 15a, 18a ... Track groove 16 ... Cage 17 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Torque transmission ball 18 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mouse part 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ Shoulder 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shaft 20a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inrow 24, 25 ・ ・ ・ ・ ・ ・End cap 26 ... Diameter expansion jig 27 ... Pilot part 28 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ End face 29 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Clamping jig 50 ... Hub wheels 50a, 55a ... Inward rolling surface 51 ...・ ・ ・ ・ ・ ・ ・ ・ Double-row rolling bearing 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Constant velocity universal joint 53 ・ ・ ・ ・ ・ ・ ・ ・ Outside Directional member 53a ... Outer rolling surface 54 ... Wheel mounting flange 55・ ・ ・ ・ ・ ・ Outer joint member 56 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ball 58 ・ ・ ・ ・··············· Retainer 59 ·························································· ..... Torque transmission ball 62 ... Usb 63 ... Shoulder 64 ... Shaft 65 ...・ ・ ・ ・ Seal 66 ・ ・ ・ ・ ・ ・ Pilot part 67 ・ ・ ・ ・ ・ ・ End face 68 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ Casting part

Claims (4)

A wheel bearing device in which a hub wheel, a double row rolling bearing and a constant velocity universal joint are unitized,
The double row rolling bearing is an outer member in which a double row outer rolling surface is formed on the inner periphery,
One end has a wheel mounting flange integrally, and on the outer periphery is one inner rolling surface facing the double row outer rolling surface, and a cylindrical small-diameter step portion extending in the axial direction from the inner rolling surface. The above-described constant velocity freely in which the formed hub wheel, the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and the shaft portion extending in the axial direction from the inner rolling surface are integrally formed. An inner member made of an outer joint member of the joint;
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
The shaft portion is fitted into the hub wheel via serrations, and the end portion is plastically deformed radially outward to be crimped to the end surface of the hub wheel. In the wheel bearing device in which the outer joint member is fixed in the axial direction,
The wheel bearing device according to claim 1, wherein the shaft portion is formed in a cylindrical shape, the diameter of the serration of the shaft portion is increased, and an engagement portion with the serration of the hub wheel is loosely packed.   The serrations of the hub ring are formed by induction hardening so that a predetermined hardened layer is formed with a surface hardness in the range of 58 to 64 HRC, and the serrations of the shaft part are left unquenched raw. Wheel bearing device. A method of manufacturing a wheel bearing device that unitizes a hub wheel, a double row rolling bearing, and a constant velocity universal joint,
The double row rolling bearing is an outer member in which a double row outer rolling surface is formed on the inner periphery,
One end has a wheel mounting flange integrally, and on the outer periphery is one inner rolling surface facing the double row outer rolling surface, and a cylindrical small-diameter step portion extending in the axial direction from the inner rolling surface. The above-described constant velocity freely in which the formed hub wheel, the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and the shaft portion extending in the axial direction from the inner rolling surface are integrally formed. An inner member made of an outer joint member of the joint;
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
The shaft portion is fitted into the hub wheel via serrations, and the end portion is plastically deformed radially outward to be crimped to the end surface of the hub wheel. In the method of manufacturing a wheel bearing device in which the outer joint member is fixed in the axial direction,
The shaft portion is formed in a cylindrical shape, the end portion of the shaft portion is plastically deformed radially outward, and the end surface of the hub wheel is swung with a caulking jig, and the caulking step A method of manufacturing a wheel bearing device according to claim 1, further comprising a step of expanding the serration of the shaft portion by pushing a diameter expansion jig into the inner diameter of the shaft portion.   The shape for the wheel according to claim 3, wherein the shape of the end portion of the shaft portion before caulking is formed so as to gradually increase toward the tip so that the thickness of the tip portion is larger than the thickness of the root portion. Manufacturing method of bearing device.

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