JP2007261305A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for wheel which is made lightweight and more compact, and at the same time, prevents a bearing creep and play between a knuckle and a bearing for wheel from occurring. <P>SOLUTION: This bearing device for wheel is equipped with the knuckle 7 made of a light alloy, and has a fourth generation structure for which a hub wheel 1 and an external joint member 10 are integrally plastic-combined. In the bearing device for wheel, the contact surfaces between a car body attaching flange 4b and the knuckle 7, and the fitting surfaces between the inner side end 4c of an external member 4 and the knuckle 7 are integrally combined by friction churning bonding. Therefore, a thermal effect by the bonding is suppressed, and the deformation and the hardness fall of the bearing section can be prevented from occurring. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like with respect to a suspension device, and more specifically, a knuckle constituting the suspension device is made of a light alloy such as an aluminum alloy and is attached to the knuckle. The present invention relates to improvement of bearings for automobiles.

  Conventionally, a wheel bearing device includes a hub wheel integrally having a wheel mounting flange for fixing a wheel, a wheel bearing for rotatably supporting the hub wheel, a knuckle for supporting the wheel bearing on a vehicle body, and a hub. A constant velocity universal joint that is connected to a wheel and transmits the power of the drive shaft to the hub wheel is mainly configured.

  Conventionally, ferrous metals such as malleable cast iron, whose linear expansion coefficient is the same as that of hub wheels, etc., have been used for the components that make up this wheel bearing device, especially the knuckle, but in recent years the aim has been to reduce the weight of the device. There is a tendency to use light alloy such as aluminum alloy and magnesium alloy. However, when the knuckle is made of such a light alloy, for example, due to the difference in the linear expansion coefficient between the knuckle and the wheel bearing, the fitting squeezing with the knuckle is reduced due to the temperature rise during traveling, and the wheel bearing against the knuckle. There has been a problem that rattling occurs due to movement in the axial direction.

  As an example of a conventional structure that avoids such a problem, a wheel bearing device as shown in FIG. 6 is known. In this wheel bearing device, a cylindrical fitting hole 51 is formed in a knuckle 50 made of an aluminum alloy, and a wheel bearing 52 is fitted in the fitting hole 51. The wheel bearing 52 has an outer ring 53 having double row outer rolling surfaces 53a and 53a formed on the inner periphery, and an inner rolling surface 54a facing the double row outer rolling surfaces 53a and 53a on the outer periphery. The pair of inner rings 54 and double-row balls 55 and 55 accommodated so as to roll between the rolling surfaces.

  Prior to fitting the wheel bearing 52 into the fitting hole 51 of the knuckle 50, a steel sheet sleeve 56 is attached to the wheel bearing 52. Here, the sleeve 56 is welded at both axial ends of the outer ring 53 as indicated by reference numeral 57. Before the sleeve 56 is attached, one of the axial end portions 56a thereof is previously bent into a radially outward direction toward the side surface 50a of the knuckle 50 by rolling, and a wheel bearing 52 having a sleeve 56 is provided. Is inserted into the fitting hole 51 of the knuckle 50. Thereafter, the other end portion 56a of the sleeve 56 is bent radially outward toward the side surface 50a of the knuckle 50 by rolling.

In this way, the wheel bearing 52 is fixed to the knuckle 50 via the sleeve 56, and the fitting squeeze between the knuckle 50 and the knuckle 50 is reduced due to the difference in the linear expansion coefficient between the knuckle 50 and the wheel bearing 52. It is possible to prevent the wheel bearing 52 from moving in the axial direction and suppress the occurrence of play.
JP-T-2003-520728

  However, in this conventional wheel bearing device, not only is the number of parts increased and the reduction in weight and compactness is hindered, but since the sleeve 56 is made of a steel plate, the linear expansion coefficient of the knuckle 50 and the wheel bearing 52 still remains. Depending on the difference, the fitting shim with the knuckle 50 may be reduced or released. In that case, the generation of bearing creep and the movement of the wheel bearing in the axial direction with respect to the knuckle 50 may cause rattling, and the fitting portion may be worn and poorly fixed, thereby improving the running stability of the vehicle. There is a risk of adverse effects. Here, creep refers to a phenomenon in which the bearing surface slightly moves in the circumferential direction due to a lack of mating squealing or poor mating surface processing accuracy, and the mating surface becomes a mirror surface, and in some cases, seizure or welding occurs with galling. .

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is intended to reduce the weight and size of the wheel bearing device and to prevent backlash between the knuckle and the wheel bearing generated due to temperature rise, preload reduction, and bearing creep. The purpose is to provide.

  In order to achieve the 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, and constitutes a suspension device. A knuckle made of a light alloy, an outer member having a body flange to be attached to the knuckle on the outer periphery, a double row outer raceway formed on the inner periphery, and a wheel mounting flange on one end A hub wheel formed on the outer periphery with one inner rolling surface facing the outer rolling surface of the double row, a small-diameter step portion extending in the axial direction from the inner rolling surface, and an outer periphery. The other inner rolling surface facing the outer rolling surface of the double row, and a hollow shaft portion extending in an axial direction from the inner rolling surface and fitted into the hub wheel are integrally formed. An inner member composed of an outer joint member constituting a constant velocity universal joint, and the inner portion And a double row rolling element that is rotatably accommodated between both rolling surfaces of the outer member, wherein the hub wheel and the outer joint member are integrally plastically coupled, At least one of the contact surface between the vehicle body mounting flange and the knuckle and the fitting surface between the inner side end of the outer member and the knuckle is joined together by bonding.

  As described above, in the fourth-generation wheel bearing device having a knuckle made of a light alloy and integrally plastically coupling the hub wheel and the outer joint member, the contact surface between the vehicle body mounting flange and the knuckle and the outer side Since at least one of the fitting surfaces of the inner side end of the member and the knuckle is integrally joined by joining, the weight expansion and the linear expansion coefficient of the knuckle and the outer member can be reduced by increasing the temperature. The bearing creep caused by the difference can be surely prevented, the backlash between the knuckle and the wheel bearing can be prevented, and the wear and fixing failure of the fitting portion can be eliminated.

  Preferably, as in the invention described in claim 2, a hardened uneven portion is formed on the inner periphery of the hub wheel, and the shaft portion of the outer joint member is fitted into the uneven portion, and the fitting is performed. If the hub ring and the outer joint member are integrally plastically bonded, the lightening and the compactness can be achieved, and the loosening of the connecting portion can be prevented. The preload set initially can be maintained over a long period of time.

  Moreover, if the outer member and the knuckle are joined by friction stir welding as in the invention described in claim 3, it is possible to suppress a thermal effect due to the joining and prevent deformation of the bearing portion and a decrease in hardness. .

  If the outer member and the knuckle are joined by laser welding as in the invention described in claim 4, local melting and solidification can be caused at the joining portion, and the thermal influence by welding is affected. It can suppress and can prevent a deformation | transformation of a bearing part and hardness fall.

  Moreover, if the laser welding is performed by supplying an Al—Si-based wire as in the invention described in claim 5, the material composition of the joint is improved and defects occurring in the joint are prevented. And a good joint can be obtained.

  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 a knuckle made of a light alloy constituting a suspension device, and an outer periphery. A body flange for attaching to the knuckle is integrally formed, an outer member having a double row outer rolling surface formed on the inner periphery, a wheel mounting flange integrally formed at one end, and the compound flange on the outer periphery. One inner rolling surface facing the outer rolling surface of the row, a hub wheel formed with a small-diameter step extending in the axial direction from the inner rolling surface, and the outer rolling surface of the double row on the outer periphery An outer joint member that constitutes the constant velocity universal joint integrally formed with the other inner rolling surface and a hollow shaft portion that extends axially from the inner rolling surface and is fitted into the hub wheel. An inner member, and between the rolling surfaces of the inner member and the outer member. A wheel bearing device in which the hub wheel and the outer joint member are integrally plastically coupled, and a contact surface between the vehicle body mounting flange and the knuckle and an outer surface thereof. At least one of the fitting surfaces between the inner side end of the side member and the knuckle is joined together by bonding, so that the weight expansion and the linear expansion coefficient of the knuckle and the outer member are increased as the temperature rises. The bearing creep caused by the difference between the knuckle and the wheel bearing can be prevented with certainty, and the wear and fixing failure of the fitting portion can be eliminated.

  A wheel bearing device in which a hub wheel, a double row rolling bearing and a constant velocity universal joint are unitized, and a knuckle made of a light alloy constituting a suspension device and a body flange to be attached to the knuckle on the outer periphery. An outer member integrally formed with a double row outer rolling surface formed on the inner periphery, and a wheel mounting flange integrally formed at one end and facing the double row outer rolling surface on the outer periphery. An inner rolling surface, a hub wheel formed with a small-diameter step 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 comprising an outer joint member that extends in the axial direction from the inner rolling surface and that forms the constant velocity universal joint integrally formed with a hollow shaft portion that is fitted into the hub wheel, and the inner member Double row rolling accommodated between the rolling surfaces of the member and the outer member. And a concavo-convex portion which is hardened on the inner periphery of the hub wheel, and a shaft portion of the outer joint member is fitted into the concavo-convex portion, and the diameter of the fitting portion is expanded to increase the concavo-convex portion. In the wheel bearing device in which the hub wheel and the outer joint member are integrally plastically joined and swaged, the contact surface between the vehicle body mounting flange and the knuckle and the inner side end of the outer member and the knuckle Are fitted together by friction stir welding or laser welding.

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, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 shows a manufacturing method of the wheel bearing device of FIG. FIG. 4 is an explanatory view showing another manufacturing method, and FIG. 5 is an enlarged view of a main part showing the embodiment of FIG. In the following description, the side closer to the outside of the vehicle in the state assembled to the vehicle is referred to as an outer side (left side in the drawing), and the side closer to the center is referred to as an inner side (right side in the drawing).

  This wheel bearing device is configured by unitizing the hub wheel 1, the double row rolling bearing 2 and the constant velocity universal joint 3, and has a configuration referred to as a fourth generation. As shown in an enlarged view in FIG. 2, the double row rolling bearing 2 includes a pair of outer members 4, 4 and an inner member 5, and double row rolling elements (balls) 6 accommodated between the two members, 6 is provided.

  The outer member 4 is made of medium carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and integrally has a vehicle body mounting flange 4b for mounting to the knuckle 7, and has a double row on the inner periphery. Outer rolling surfaces 4a and 4a are formed. The double row outer raceway surfaces 4a and 4a are hardened by induction hardening to a surface hardness of 58 to 64 HRC. The outer member 4 is not limited to medium carbon steel, and examples thereof include carburized steel such as SCr420 and SCM415 having a relatively small amount of carbon.

  The inner member 5 includes a hub wheel 1 and an outer joint member 10 to be described later that is fitted into the hub wheel 1. The hub wheel 1 is integrally provided with a wheel mounting flange 8 for mounting a wheel (not shown) at an end portion on the outer side, and is opposed to the double row outer rolling surfaces 4a and 4a on the outer periphery (outer side). The inner rolling surface 1a and a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed. Hub bolts 8 a for fixing the wheels are planted at equal intervals in the circumferential direction of the wheel mounting flanges 8. The hub wheel 1 is made of medium carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and has a high frequency from the inner rolling surface 1a to the small diameter step portion 1b from the base of the wheel mounting flange 8. The surface hardness is hardened by quenching to a range of 58 to 64 HRC.

  Here, an uneven portion 9 that is hardened by induction hardening is formed on the inner periphery of the hub wheel 1. The concavo-convex portion 9 is formed in an iris knurl shape, and a plurality of annular grooves formed independently by turning or the like and a plurality of axial grooves formed by broaching or the like are crossed grooves configured to be substantially orthogonal, Or it consists of the crossing groove | channel comprised by the helical groove | channel inclined mutually. Further, in order to ensure good biting property, the tip of the concavo-convex portion 9 is formed in a spire shape such as a triangular shape.

  As shown in FIG. 1, the constant velocity universal joint 3 includes an outer joint member 10, a joint inner ring 11, a cage 12, and a torque transmission ball 13. The outer joint member 10 is integrally formed with a cup-shaped mouth portion 14, a shoulder portion 15 that forms the bottom of the mouth portion 14, and a hollow shaft portion 16 that extends from the shoulder portion 15 in the axial direction. On the outer periphery of the shoulder portion 15, the other (inner side) inner rolling surface 10 a facing the double row outer rolling surfaces 4 a, 4 a of the outer member 4 is formed. The shaft portion 16 is formed with an inrow portion 16a that is cylindrically fitted to the small-diameter step portion 1b of the hub wheel 1 via a predetermined shimiro, and a fitting portion 16b is formed at the end of the inrow portion 16a. .

  Double-row rolling elements 6, 6 are accommodated between the rolling surfaces 4a, 1a, 4a, 10a of the outer member 4 and the inner member 5, and these double-row rolling elements 6, 17 are held by the cages 17, 17, respectively. 6 is rotatably held. Further, seals 18 and 19 are attached to the opening of the annular space formed between the outer member 4 and the inner member 5, leakage of the lubricating grease sealed inside the bearing, rainwater, dust, etc. from the outside Is prevented from entering the inside of the bearing. In addition, although what was comprised by the double row angular contact ball bearing which used the ball for the rolling element 6 as the double row rolling bearing 2 was illustrated here, it is not restricted to this, For example, the tapered roller was used for the rolling element. You may be comprised with the double row tapered roller bearing.

  Here, in a state where the shaft portion 16 of the outer joint member 10 is press-fitted into the hub wheel 1 with a predetermined scissors, and the shoulder portion 15 of the outer joint member 10 is abutted against the end surface of the small diameter step portion 1b, the fitting portion 16b. A diameter expanding jig such as a mandrel is pushed into the inner diameter of the outer ring to expand the fitting portion 16b, and the fitting portion 16b is bitten into the concavo-convex portion 9 of the hub wheel 1 and crimped. The joint member 10 is integrally plastically coupled. As a result, the weight can be reduced and the size can be reduced, the loosening of the coupling portion can be prevented, and the preload set initially can be maintained over a long period of time. Note that here, the hub wheel 1 and the outer joint member 10 are plastically coupled by diameter expansion caulking, but the coupling between the hub wheel and the outer joint member is not limited to this, for example, although not illustrated. Alternatively, the outer joint member may be fitted into the hub wheel, and the two members may be plastically coupled by so-called rocking caulking, in which the end of the shaft portion is plastically deformed radially outward.

  Reference numeral 20 denotes an end cap attached to an end portion on the outer side of the hub wheel 1, which prevents rainwater, dust, or the like from entering from the outside and rusting the joint portion. Reference numeral 21 denotes an end cap that is fitted into the shoulder 15 of the outer joint member 10. Leakage of the lubricating grease sealed inside the joint and foreign matters such as rainwater and dust from the outside to the inside of the joint. Preventing intrusion.

  The knuckle 7 is made of a light alloy such as an aluminum alloy. Thereby, compared with conventional cast iron etc., even if each part is designed to be thick in order to make up for lack of rigidity, the weight is reduced by half, and weight reduction can be achieved. In the present embodiment, as shown in FIG. 2, the knuckle 7 and the outer member 4 are integrally joined by friction stir welding, so-called FSW (Friction Stir Welding). This FSW is one of solid-phase bonding methods, in which a rotor having a probe at the tip is rotated and pushed into a butt joint, and members softened by frictional heat are agitated (plastic fluidized) and joined.

  Since FSW is a solid phase bonding, it can suppress the residual stress and deformation due to bonding compared to general arc welding, etc., and the metal structure of the bonded portion becomes a fine crystal structure to increase the strength of the bonded portion. Can be increased. The material of the member to be joined may be a material softer than the probe, and the members to be joined are joints of different metals such as the knuckle 7 made of light alloy and the outer member 4 made of medium carbon steel. Also has the feature that it is possible.

Next, a method for joining the knuckle 7 and the outer member 4 will be described with reference to FIG.
In the present embodiment, the knuckle 7, the vehicle body mounting flange 4b of the outer member 4, and the end 4c on the inner side are joined. First, the outer member 4 is fitted in the knuckle 7, the vehicle body mounting flange 4b and the knuckle 7 are brought into contact with each other in abutting state, and the pin-like probe 22a is brought into contact with the corner with a predetermined contact pressure. The probe 22a is made of a heat-resistant material that is harder than the joining member, here, the outer member 4 and the knuckle 7 and can withstand frictional heat generated during joining, and projects on the end axis of the cylindrical rotor 22. It is integrally formed. By rotating the rotor 22 at a high speed, the probe 22a is also rotated at a high speed, and the contact portion is softened and plasticized by frictional heat due to the contact. Further, the probe 22a is pressed and inserted into the contact portion.

  Thereafter, the probe 22a is moved in the circumferential direction along the contact portion between the vehicle body mounting flange 4b and the knuckle 7. Due to the rotation of the probe 22a, the vicinity of the contact portion with the probe 22a (joint portion 23) is softened and agitated by frictional heat, and the probe 22a moves to cause the softening and stirring portion to receive the advance pressure of the probe 22a. The probe 22a plastically flows so as to wrap around in the advancing direction of the probe 22a so as to fill the recess through which 22a has passed. Then, the frictional heat is rapidly lost, and the joint portion 23 is cooled and solidified. This state is sequentially repeated with the movement of the probe 22a, and the contact portion between the vehicle body mounting flange 4b and the knuckle 7 is joined over the entire circumference.

  Regarding the other joint portion 24, first, the probe 25a is brought into contact with the fitting surface between the outer member 4 and the knuckle 7 with a predetermined contact pressure. Then, by rotating the rotor 25 at a high speed, the probe 25a is also rotated at a high speed, and the contact portion is softened and plasticized by frictional heat. Further, the probe 25a is pressed and inserted into the contact portion. Here, it is preferable that the shoulder 25b of the rotor 25 is brought into contact with the outer member 4 and the end surface of the knuckle 7 with the probe 25a inserted. Accordingly, softening is promoted by the contact of the shoulder portion 25b, and scattering of the material in the softened portion being joined is suppressed, and a uniform surface of the joined portion 24 is obtained.

  Thereafter, the probe 25a is moved in the circumferential direction along the fitting surface between the end portion 4c of the outer member 4 and the knuckle 7, so that the fitting surface between the end portion 4c of the outer member 4 and the knuckle 7 is completely removed. Joined over the circumference. Here, in order to prevent the thermal influence during joining, the end 4c of the outer member 4 is formed to extend slightly in the axial direction, and the end 4c of the outer member 4 and the knuckle 7 are formed. In order to join the fitting surfaces to each other efficiently, each end face is set to be substantially flush.

  Thus, in this embodiment, since the knuckle 7 and the outer member 4 are integrally joined by friction stir welding, the number of parts is reduced to reduce the weight and the size of the knuckle 7 and the outer knuckle 7 and the outer member 4 are increased by the temperature rise. Bearing creep caused by the difference in linear expansion coefficient of the side member 4 can be reliably prevented, and rattling between the knuckle 7 and the outer member 4 can be prevented, and wear / fixing failure of the fitting portion can be eliminated. Moreover, the thermal influence by joining can be suppressed and a deformation | transformation and hardness fall of a bearing part can be prevented.

  The knuckle 7 and the outer member 4 are not limited to friction stir welding, and may be joined by laser welding as shown in FIG. In addition, the same code | symbol is attached | subjected to the site | part which has the same components same site | part or the same function as embodiment mentioned above, and the detailed description is abbreviate | omitted.

  First, the outer member 4 is fitted into the knuckle 7, the vehicle body mounting flange 4b and the knuckle 7 are brought into contact with each other in abutting state, and the high energy density laser beam condensed by the light collecting unit 26 on the contact surface. 26a is irradiated, and the surface temperature of the contact surface is rapidly increased to cause local melting and solidification. And the condensing unit 26 is moved to the circumferential direction along the contact part of the vehicle body mounting flange 4b and the knuckle 7, and the contact part of the vehicle body mounting flange 4b and the knuckle 7 is joined over the whole periphery. . In order to make it easier for the laser beam 26a to enter the contact surface, as shown in FIG. 5A, the vehicle body mounting flange 4b and the knuckle 7 may be abutted through a slight gap. Further, as shown in (b), the outer diameter portion of the vehicle body mounting flange 4b may be formed in a groove shape.

  And the condensing unit 26 is made to oppose the fitting surface of the outer member 4 and the knuckle 7, and the laser beam 26a is irradiated, and the fitting surface of the inner side end 4c and the knuckle 7 extends over the entire circumference. Are joined. Thereby, similarly to the friction stir welding described above, it is possible to suppress the thermal effect due to welding and to prevent the bearing portion from being deformed and hardness reduced. The joint portions 27 and 28 are provided over the entire circumference, but may be provided over a predetermined length at a plurality of locations in the circumferential direction. Thereby, welding time can be shortened and the heat influence by welding can be suppressed to the minimum.

  Here, in this embodiment, since it is welding including medium carbon steel in which welding defects are likely to occur, the joint surface between the outer member 4 and the knuckle 7 is preheated by welding by high frequency induction heating. This preheating time is 10 sec. The preheating temperature is about 300 ° C. or less, preferably 160 to 180 ° C. which is less than or equal to the tempering temperature of the outer member 4. This preheating before welding can suppress the cooling rate of the welded portion, and can prevent weld cracking due to transformation. Further, the increase in heat input deepens the penetration during welding, and the strength of the joint portions 27 and 28 can be increased. Further, in order to stabilize the structure of the joints 27 and 28 after welding, it is preferable to perform post-heating at a temperature lower than the tempering temperature.

  Furthermore, in this embodiment, a wire (not shown) is supplied to a keyhole generated by laser irradiation during welding. This wire is made of, for example, an Al—Si-based wire of Si (silicon) 13.3 wt% or more. By performing welding while supplying the wire in this way, the material composition of the joint portions 27 and 28 is improved, that is, the joint portion 27, It is possible to prevent welding defects such as cracks occurring in the steel 28.

  In addition, the joining method can be exemplified by the above-described friction stir welding, electron beam welding, arc welding, and the like. However, in the case of this arc welding, in order to prevent the heat influence on the bearing portion, point welding is preferable instead of joining the entire circumference of the coupling portion.

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

  The wheel bearing device according to the present invention can be applied to a wheel bearing device of a fourth generation structure in which a double row rolling bearing is unitized in a knuckle made of a light alloy such as an aluminum alloy having a larger linear expansion coefficient than steel. .

It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the manufacturing method of the wheel bearing apparatus of FIG. It is explanatory drawing which shows another manufacturing method same as the above. (A), (b) is a principal part enlarged view which shows the embodiment of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Double row rolling bearing 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Constant velocity universal joint 4. Outer member 4a Outer rolling surface 5 Inner member 6・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Knuckle 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 8a ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ Hub bolt 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Concavity and convexity 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer joint member 11 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fitting inner ring 12 ... Cage 13 ... Torque transmission ball 14 ... Mouse part 15, 25b ... ..Shoulder part 16 ... Shaft part 16a ... In wax 16b ... fitting part 17 ... retainer 18, 19 ... seal 20, 21 ... End caps 22, 25 ... Rotors 22a, 25a ... Probes 23, 24, 27, 28 ... Joints 26 ... Optical unit 26a ... Laser beam 50 ... Knuckle 50a ... Side 51 ... ··· Fitting hole 52 ·········· Wheel bearing 53 ··········· Outside member 53a ······ Outer rolling surface 54 ... Inner ring 54a ... Inner rolling surface 55 ... Ball 56 ... ... Sleeve 56a ... End 57 ........... junction

Claims (5)

A wheel bearing device in which a hub wheel and a double row rolling bearing and a constant velocity universal joint are unitized,
A knuckle made of a light alloy constituting the suspension device;
An outer member integrally having a vehicle body flange to be attached to the knuckle on the outer periphery, and having a double row outer rolling surface formed on the inner periphery;
A wheel mounting flange is integrally formed at one end, and one inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery, and a small diameter step portion extending in the axial direction from the inner rolling surface is formed. A hub wheel, and the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a hollow shaft portion extending in an axial direction from the inner rolling surface and fitted into the hub wheel. An inner member composed of an outer joint member constituting the constant velocity universal joint formed integrally;
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
In the wheel bearing device in which the hub wheel and the outer joint member are integrally plastically coupled,
At least one of the contact surface between the vehicle body mounting flange and the knuckle and the fitting surface between the inner side end of the outer member and the knuckle is integrally joined by bonding. .   A hardened uneven portion is formed on the inner periphery of the hub wheel, and the shaft portion of the outer joint member is fitted into the uneven portion, and the diameter of the fitting portion is increased to bite into the uneven portion. The wheel bearing device according to claim 1, wherein the hub wheel and the outer joint member are integrally plastically coupled.   The wheel bearing device according to claim 1 or 2, wherein the outer member and the knuckle are joined by friction stir welding.   The wheel bearing device according to claim 1 or 2, wherein the outer member and the knuckle are joined by laser welding.   The wheel bearing device according to claim 4, wherein the laser welding is performed by supplying an Al—Si-based wire.

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