JP2007331575A - Wheel bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight, compacted fourth-generation-structure of wheel bearing device having improved safety and reliability. <P>SOLUTION: The fourth-generation-structure wheel bearing device comprises a hub ring 1 and an outside joint member 10 plastically joined in one unit with enlarged diameter caulking. Herein, a connection member 23 ring-shaped by pressing a steel plate is fitted in an inward member 5. The connection member 23 is formed with a single member having a flange 23a at one end, extending outward in the radial direction, and a diameter enlarged portion 23b at the other end. The flange portion 23a and the diameter enlarged portion 23b are engaged with the end of the hub ring 1 and with the inner periphery of the outside joint member 10, respectively, and the hub ring 1 and the outside joint member 10 are fixed to each other in the axial direction. A fail-safe mechanism actuates a system in the safety direction even if there is strength dispersion in a joint portion 21. Thus, the fourth-generation-structure wheel bearing device has improved safety and reliability. <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 fourth generation structure in which a hub wheel, a constant velocity universal joint and a double row rolling bearing are unitized. The present invention relates to a wheel bearing device.

  A wheel bearing device for rotatably supporting a wheel of an automobile or the like is a second generation having a body mounting flange integrally with an outer member from a structure called a first generation that uses a double row rolling bearing alone. In addition, the third generation in which one inner rolling surface of the double row rolling bearing is integrally formed on the outer periphery of the hub ring integrally having the wheel mounting flange, and further, the constant velocity universal joint is provided on the hub ring. Have been developed to the fourth generation in which the other inner rolling surface of the double row rolling bearing is integrally formed on the outer periphery of the outer joint member constituting the constant velocity universal joint.

  FIG. 5 is a representative example of a fourth-generation wheel bearing device. This wheel bearing device is configured by unitizing a hub wheel 51, a double row rolling bearing 52, and a constant velocity universal joint 53. 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).

  The hub wheel 51 integrally has a wheel mounting flange 54 for mounting a wheel (not shown) at an end portion on the outer side, and hub bolts 56 are implanted at circumferentially equidistant positions. Further, an uneven portion 55 is formed on the inner peripheral surface of the hub wheel 51, and the surface hardness is set to a range of 54 to 64HRC by induction hardening.

  The double-row rolling bearing 52 includes an outer member 57, an inner member 58, and double-row balls 59, 59. The outer member 57 integrally has a vehicle body mounting flange 57b for mounting to a suspension device (not shown) on the outer periphery, and double row outer rolling surfaces 57a and 57a are formed on the inner periphery. On the other hand, the inner member 58 includes a hub wheel 51 and an outer joint member 63 that is fitted into the small-diameter step portion 51b of the hub wheel 51 in a butt-fit state. Outboard inner rolling surfaces 51a and 63a are directly formed on the outer circumferences of the hub wheel 51 and the outer joint member 63, respectively, and double row balls 59 and 59 are formed between the rolling surfaces 57a and 51a and 57a and 63a. Each is accommodated and held by the cages 60 and 60 so as to be freely rollable. In addition, seals 61 and 62 are attached to the ends of the double row rolling bearing 52 to prevent leakage of lubricating grease sealed inside the bearing and intrusion of rainwater and dust from the outside into the bearing. ing.

The constant velocity universal joint 53 includes an outer joint member 63, a joint inner ring 64, a cage 65, and a torque transmission ball 66. The outer joint member 63 integrally includes a cup-shaped mouth portion 67, a shoulder portion 68 that forms the bottom portion of the mouth portion 67, and a hollow stem portion 69 that extends from the shoulder portion 68 in the axial direction. Formed on the outer periphery of the stem portion 69 are an inrow portion 69a fitted into the small diameter step portion 51b of the hub wheel 51 and a fitting portion 69b extending further in the axial direction from the inrow portion 69a. Then, a diameter expanding jig such as a mandrel is pushed into the inner diameter of the stem portion 69 to expand the fitting portion 69b, and the fitting portion 69b is bitten into the concave and convex portion 55 of the hub wheel 51 to be crimped. The outer joint member 63 is integrally plastically coupled. As a result, it is possible to provide a wheel bearing device that is lighter and more compact, and that prevents loosening of the coupling portion over a long period of time even when a large moment load is applied, and has improved durability.
Japanese Patent Laid-Open No. 2001-18605

  In such a conventional wheel bearing device, the diameter of the fitting portion 69b of the stem portion 69 is expanded to bite into the uneven portion 55 of the hub wheel 51, and the hub wheel 51 and the outer joint member 63 are integrally plastically coupled. However, if the tightening strength of the coupling portion is weak, the hub wheel 51 may be displaced relative to the outer joint member 63 and move in the axial direction, as indicated by a two-dot chain line in the figure. In this case, the wheel attached to the hub wheel 51 falls off the vehicle together with the hub wheel 51. As described above, in the conventional wheel bearing device in which the strength of the joint portion cannot be determined by nondestructive inspection, an improvement in the so-called fail-safe aspect in which the system operates in a safe direction even in such a case is desired. ing.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fourth-generation wheel bearing device that is light and compact and has improved safety and reliability. .

  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, and is a suspension device on the outer periphery. 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 double row on the outer periphery. One inner rolling surface facing the outer rolling surface, a hub wheel formed with a small diameter step portion extending in the axial direction from the inner rolling surface, and a hollow stem portion fitted to the hub wheel An inner member formed of an outer joint member of the constant velocity universal joint, the inner member having an outer periphery and the other inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery, and the inner member and the A double row rolling element that is rotatably accommodated between both rolling surfaces of the outer member, and the hub A hardened concave and convex portion is formed on the inner periphery of the outer joint member, and the stem portion of the outer joint member is expanded in diameter to be swept into the concave and convex portion, and the hub ring and the outer joint member are integrally plastically coupled. In the wheel bearing device, a cylindrical coupling member is fitted into the inner member, and both end portions of the coupling member engage with the hub wheel and the outer joint member, respectively. It is fixed in the axial direction.

  Thus, in the wheel bearing device of the fourth generation structure in which the hub wheel and the outer joint member are integrally plastically coupled, a cylindrical coupling member is fitted into the inner member, and both end portions of the coupling member are Since the hub wheel and the outer joint member are respectively engaged in the hub ring and the outer joint member and are fixed in the axial direction, the system operates in a safe direction even if there is a variation in the strength of the plastic joint. It is possible to provide a fourth-generation wheel bearing device that includes a fail-safe mechanism that improves safety and reliability.

  According to a second aspect of the present invention, the connecting member includes a radially extending flange that engages with an end of the hub wheel at one end and an inner portion of the outer joint member at the other end. You may be comprised with the single member which has an enlarged diameter part engaged with the periphery.

  According to a third aspect of the present invention, the connecting member has an outer flange that engages with the inner periphery of the outer joint member at one end, and a female screw is formed at the inner periphery of the other end. An annular connecting ring and a radially extending flange that engages with the end of the hub wheel at one end, and a male screw that is fastened to the female thread of the connecting ring is formed on the outer periphery of the other end. If it is composed of two pieces consisting of a plug, the connecting member is mounted on the inner member without play.

  According to a fourth aspect of the present invention, the connecting member includes an outer casing at one end and a first connecting ring in which a cylindrical portion extending in the axial direction from the outer casing is formed. It has a flange extending radially outward to engage the end of the hub wheel, and is composed of two pieces comprising a cylindrical portion extending in the axial direction from this flange and a second connecting ring formed with a small diameter portion. At the same time, if the small diameter portion is fitted into the cylindrical portion of the first connecting ring and the first and second connecting rings are integrally joined by welding, the joint portion of the connecting member is caused by vibration or the like. It can be securely fixed without loosening for a long time, and safety and reliability can be improved.

  Further, as in the invention described in claim 5, if the pitch circle diameter of the inner side rolling elements of the double row rolling elements is set to be larger than the pitch circle diameter of the outer side rolling elements. Effectively utilizing the bearing space, the number of rolling element rows on the inboard side can be accommodated more than the number of rolling element rows on the outboard side, thus reducing the weight and size, and increasing the bearing rigidity. The life of the bearing can be extended.

  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 vehicle body flange to be attached to a suspension device is integrally formed on the outer periphery. An outer member having a double row outer rolling surface 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 wheel, a hub wheel formed with a small-diameter step portion extending in the axial direction from the inner rolling surface, and a hollow stem portion fitted to the hub wheel are integrally formed, and the double row is arranged on the outer periphery. An inner member made of an outer joint member of the constant velocity universal joint formed with the other inner rolling surface facing the outer rolling surface of the inner member, and between the rolling surfaces of the inner member and the outer member. A double row rolling element accommodated in a freely rolling manner, and a hardened uneven portion is formed on the inner periphery of the hub wheel. In addition, in the wheel bearing device in which the diameter of the stem portion of the outer joint member is expanded and bitten into the uneven portion and caulked, and the hub wheel and the outer joint member are integrally plastically coupled, Since a cylindrical connecting member is fitted into the member, both ends of the connecting member engage with the hub wheel and the outer joint member, respectively, and the hub wheel and the outer joint member are fixed in the axial direction. 1. To provide a fourth-generation wheel bearing device having a fail-safe mechanism in which the system operates in a safe direction even if there is a variation in strength in the plastic joint, and which has improved safety and reliability. it can.

  A wheel bearing device in which a hub wheel, a double row rolling bearing and a constant velocity universal joint are unitized, and has a body flange integrally attached to a suspension device on the outer periphery, and an outer periphery of the double row on the inner periphery. An outer member on which a rolling surface is formed, a wheel mounting flange at one end, and one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and this inner rolling surface A hub wheel formed with a small-diameter step portion extending in the axial direction from the center, and a hollow stem portion fitted to the hub wheel, and the other side facing the double row outer rolling surface on the outer periphery An inner member composed of an outer joint member of the constant velocity universal joint formed with an inner rolling surface, and a double row accommodated in a freely rolling manner between both rolling surfaces of the inner member and the outer member. A rolling irregularity is formed on the inner periphery of the hub wheel, and the stem portion is formed. In the wheel bearing device in which the hub ring and the outer joint member are integrally plastically coupled, the inner diameter of the hub ring and the outer joint member are integrally crimped by expanding the diameter of the fitting portion and biting into the uneven portion. A connecting member formed in an annular shape by pressing a steel plate is fitted into the side member, and this connecting member is a single member having a flange extending radially outward at one end and an enlarged portion at the other end. The flange and the enlarged diameter portion are engaged with the end portion of the hub wheel and the inner periphery of the outer joint member, and the hub wheel and the outer joint member are fixed in the axial direction.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention.
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. The double row rolling bearing 2 includes an outer member 4, an inner member 5, and double row rolling elements (balls) 6, 6 accommodated between the two members.

  The outer member 4 is formed of medium carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and integrally includes a vehicle body mounting flange 4c for mounting to a knuckle (not shown). Double row outer rolling surfaces 4a and 4b are formed. And these double row outer side rolling surfaces 4a and 4b are hardened by induction hardening in the range of 58-64 HRC surface hardness.

  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 integrally has a wheel mounting flange 7 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 4b on the outer periphery (outer side). ) And a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a. Hub bolts 8 for fixing the wheels are planted at equal intervals in the circumferential direction of the wheel mounting flange 7. 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 raceway surface 1a to the small diameter step 1b from the base of the wheel mounting flange 7. 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.

  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 portion of the mouth portion 14, and a hollow stem 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 that faces the double row outer rolling surfaces 4 a and 4 b of the outer member 4 is formed. The stem 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. .

  The outer joint member 10 is formed of medium carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and extends from the outer periphery of the shoulder portion 15 to the outer periphery of the inrow portion 16a of the stem portion 16 including the inner rolling surface 10a. As a result, the surface hardness is set to a range of 58 to 64 HRC by induction hardening. In addition, the fitting part 16b is left with the raw surface hardness after forging.

  Double-row rolling elements 6, 6 are accommodated between the rolling surfaces 4a, 1a and 4b, 10a of the outer member 4 and the inner member 5, and these double-row rolling elements 6, 18 are held by the cages 17, 18; 6 are each hold | maintained so that rolling is possible. In this embodiment, the pitch circle diameter PCDi of the inner side rolling element 6 is set larger than the pitch circle diameter PCDo of the outer side rolling element 6. That is, with the difference in pitch circle diameters PCDo and PCDi of the double row rolling elements 6 and 6, the groove bottom diameter of the inner rolling surface 10 a in the outer joint member 10 in the inner member 5 is the inner rolling in the hub wheel 1. The diameter is larger than the groove bottom diameter of the surface 1a. On the other hand, in the outer member 4, the groove bottom diameter of the outer rolling surface 4 b on the inboard side is formed larger than the groove bottom diameter of the outer rolling surface 4 a on the outboard side. Therefore, the outer diameters of the double-row rolling elements 6 and 6 are the same, but the pitch circle diameters PCDo and PCDi can be made different by effectively utilizing the bearing space. Can be accommodated more than the number of rolling elements on the outboard side, and the weight and size can be reduced, and the bearing rigidity can be increased and the bearing life can be extended.

  Further, seals 19 and 20 are attached to the opening of the annular space formed between the outer member 4 and the inner member 5, leakage of lubricating grease sealed inside the bearing, rainwater, dust, etc. from the outside Is prevented from entering the inside of the bearing. Here, the double-row angular contact ball bearing using balls as the rolling elements 6 is illustrated as the double-row rolling bearing 2, but not limited to this, for example, double-row tapered roller bearings using tapered rollers as the rolling elements. It may be.

  Here, in a state where the stem 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. The fitting portion 16b is expanded in diameter by pushing a diameter expansion jig such as a mandrel into the outer side. In other words, the hub wheel 1 and the outer joint member 10 are integrally plastically coupled by plastically deforming the fitting portion 16b and biting into the uneven portion 9 of the hub wheel 1 and caulking. As a result, loosening of the connecting portion 21 can be prevented, and the initially set preload can be maintained over a long period of time. Reference numeral 22 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 enter the joint from the outside. Is preventing.

  Here, in this embodiment, the connecting member 23 that engages with the hub wheel 1 and the outer joint member 10 is mounted. The connecting member 23 is formed in an annular shape by pressing a steel plate such as a stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like). The outer end has a flange 23a that extends radially outward. After the hub wheel 1 and the outer joint member 10 are plastically connected, the connecting member 23 is inserted into the stem portion 16 of the outer joint member 10 from the outer side of the hub wheel 1, and the flange 23 a is engaged with the hub wheel 1. In the combined state, the end portion on the inner side along the inner peripheral surface of the shoulder portion 15 is formed with an enlarged diameter portion 23b by coining or partial caulking. In other words, the hub wheel 1 and the outer joint member 10 are fixed in the axial direction by the enlarged diameter portion 23b and the flange 23a, and the system operates in a safe direction even if the strength of the coupling portion 21 varies. It has a safe mechanism. Therefore, it is possible to provide a wheel bearing device having a fourth generation structure with improved safety and reliability.

  FIG. 2 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention. In this embodiment, only the configuration of the connecting member is partially different from that of the above-described embodiment, and other parts having the same parts or the same functions as those of the above-described embodiment are denoted by the same reference numerals and are described in detail. Is omitted.

  The connecting member 24 is a modification of the connecting member 23 described above, and a steel plate is formed into an annular shape by pressing, and has a partition wall 24a on the inner periphery. The partition wall 24a increases the strength and rigidity of the connecting member 24, and, in combination with the end cap 22 fitted in the shoulder portion 15 of the outer joint member 10, significantly improves the sealing performance, thereby ensuring safety and reliability. Can increase the sex.

  FIG. 3 is a longitudinal sectional view showing a third embodiment of the wheel bearing device according to the present invention. Note that this embodiment is basically different from the above-described embodiment only in the configuration of the connecting member, and other parts having the same parts or the same functions as those of the above-described embodiment are denoted by the same reference numerals. The detailed explanation is omitted.

  The connecting member 25 is composed of two pieces including a connecting ring 26 formed in an annular shape and a plug 27 screwed to the connecting ring 26. The connection ring 26 has an outer flange 26a at the inner end, and a female screw 26b is formed on the inner periphery of the outer end. On the other hand, the plug 27 has a flange 27 a that engages with the outer end of the hub wheel 1, and a shaft portion 27 b that extends in the axial direction from the flange 27 a is formed. A male screw 27c that is screwed into the female screw 26b of the connecting ring 26 is formed at the end of the shaft portion 27b.

  After the hub wheel 1 and the outer joint member 10 are plastically coupled, the connecting ring 26 is inserted into the stem portion 16 from the inner side of the outer joint member 10, and the outer collar 26 a is engaged with the inner periphery of the shoulder portion 15. In this state, the plug 27 is inserted into the stem portion 16 from the outer side of the hub wheel 1, and the plug 27 and the connection ring 26 are fastened. As a result, the outer flange 26a and the flange 27a are engaged with the hub wheel 1 and the outer joint member 10 and fixed in the axial direction, so that the connecting member 25 is mounted on the inner member 5 without play and the outer joint member. Combined with the end cap 22 fitted in the shoulder 15 of the ten, the sealing performance is remarkably improved, and safety and reliability can be enhanced.

  FIG. 4 is a longitudinal sectional view showing a fourth embodiment of the wheel bearing device according to the present invention. This embodiment is a modification of the above-described third embodiment, and other parts having the same parts or the same functions as those of the above-described embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  The connecting member 28 is composed of two pieces including a first connecting ring 29 formed in an annular shape by pressing a steel plate and a second connecting ring 30 joined to the first connecting ring 29. ing. The first connecting ring 29 is formed with an outer casing 29a and a cylindrical section 29b extending in the axial direction from the outer casing 29a at the end on the inner side. On the other hand, the second connecting ring 30 is formed with a flange 30a that engages with the outer end of the hub wheel 1, and a cylindrical portion 30b and a small-diameter portion 30c that extend in the axial direction from the flange 30a. Yes. A bottom portion 30d is provided at the end of the small diameter portion 30c.

  After the hub wheel 1 and the outer joint member 10 are plastically coupled, the first connecting ring 29 is inserted into the stem portion 16 from the inner side of the outer joint member 10, and the outer flange 29 a is engaged with the inner periphery of the shoulder portion 15. In the combined state, the second connecting ring 30 is inserted from the outer side of the hub wheel 1, and the small diameter portion 30 c is fitted into the cylindrical portion 29 b of the first connecting ring 29. And these 1st and 2nd connection rings 29 and 30 are joined integrally by welding. Thus, the flange 30a and the outer flange 29a are engaged with the hub wheel 1 and the outer joint member 10 and fixed in the axial direction. Thereby, the joint part of the connection member 28 can be reliably fixed without loosening over a long period of time due to vibration or the like, and safety and reliability can be improved.

  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 constant velocity universal joint, and a double row rolling bearing are unitized.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows 4th Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a, 10a ・ ・ ・ ・ ・ ・ Inner rolling surface 1b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 2 ・ ・ ・············· Double row rolling bearing 3 ·····················································・ ・ ・ ・ Outer rolling surface 4c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 6 ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ Rolling element 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Roughness Part 10 ········· Outer joint member 11 ·················································································· ... Torque transmission ball 14 ... Mouse part 15 ... ··· shoulder 16 ······ stem portion 16a ··· inrow portion 16b ··· fitting portions 17 and 18 ·············································································································· End cap 23, 24, 25, 28 .. Connecting members 23a, 27a, 30a .. Flange 23b... Expanded diameter portion 26. ··········································································································· 27x ··········································································· First Link Rings 29b, 30b. ... Bottom 51 ···························· Hub Rings 51a, 63a ···· Inner Rolling Surface 52 ····················・ ・ ・ ・ ・ Constant velocity universal joint 54 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 55 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Concavity and convexity 56 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・..Hub bolt 57 ........ Outer member 57a .... Outer rolling surface 57b ..... Car body mounting flange 58 ..・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ball 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cage 61, 62 ・ ・ ・ ・ ・ ・ ・ ・Seal 63 ... Outer joint member 64 ... Joint inner ring 65 ... Cage 66 ...・ ・ ・ ・ ・ Torque transmission ball 67 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ Mouse part 68 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder 69 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Stem part 69a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ In-row part 69b ・································································ Pitch diameter of the inner side rolling element row PCDo ··········· Pitch of the outer side rolling element row Circle diameter

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,
An outer member having a body flange integrally attached to the suspension on the outer periphery and having a double row outer raceway 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. The constant velocity freely having a hub ring and a hollow stem portion fitted to the hub ring integrally, and having the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery. 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;
A hardened concave and convex portion is formed on the inner periphery of the hub wheel, and the stem portion of the outer joint member is expanded in diameter to be bitten into the concave and convex portion, and the hub wheel and the outer joint member are integrated. In a plastically coupled wheel bearing device,
A cylindrical connecting member is fitted into the inner member, and both ends of the connecting member engage with the hub wheel and the outer joint member, respectively, so that the hub wheel and the outer joint member are fixed in the axial direction. A wheel bearing device characterized by that.   The connecting member has a single flange having a radially extending flange that engages with the end of the hub wheel at one end and a diameter-enlarged portion that engages with the inner periphery of the outer joint member at the other end. The wheel bearing device according to claim 1, comprising a member.   The connecting member has an outer connecting ring which engages with the inner periphery of the outer joint member at one end, and an annular connecting ring in which an internal thread is formed on the inner periphery of the other end, and the hub wheel at one end And a flange extending outward in the radial direction that engages with the end of the other end, and is formed of two pieces including a plug in which a male screw to be fastened to the female screw of the connecting ring is formed on the outer periphery of the other end. Item 2. A wheel bearing device according to Item 1.   The connecting member includes a first connecting ring in which an outer casing is formed at one end and a cylindrical section extending in an axial direction from the outer casing, and a radially outer side engaged with the end of the hub wheel at one end. And a second connecting ring having a cylindrical portion extending in the axial direction from the flange and a second connecting ring formed with a small diameter portion, and the small diameter portion of the first connecting ring. The wheel bearing device according to claim 1, wherein the wheel bearing device is fitted into the cylindrical portion and the first and second connecting rings are integrally joined by welding.   The wheel bearing device according to any one of claims 1 to 4, wherein a pitch circle diameter of an inner side rolling element of the double row rolling elements is set larger than a pitch circle diameter of an outer side rolling element. .

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