JP5166756B2 - Wheel bearing and wheel bearing device provided with the same - Google Patents

Description

  The present invention relates to a wheel bearing for rotatably supporting a wheel of a vehicle such as an automobile, and more particularly, to a wheel bearing for reducing the weight, size and cost, and improving the durability of the bearing. The present invention relates to a wheel bearing device provided.

  2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like supports a hub wheel for mounting a wheel rotatably via a double row rolling bearing, and includes a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and both an inner ring rotation method and an outer member rotation method are generally used for driven wheels. This 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, and an outer member. 2nd generation structure with body mounting flange or wheel mounting flange formed directly on the outer periphery of the wheel, 3rd generation structure with one inner rolling surface formed directly on the outer periphery of the hub wheel, or constant speed with the hub wheel It is roughly classified into a fourth generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the universal joint.

  Conventionally, an angular ball bearing having a structure in which an inner ring and an outer ring (outer member) are formed by pressing from a steel plate is known. For example, the angular ball bearing 50 shown in FIG. 5 is used in a magnetic hard disk device or the like, but the outer ring 51 and the pair of inner rings 52 and 53 are formed from a stainless steel plate by pressing or rolling.

  The outer ring 51 is formed with an annular convex portion 51a protruding radially inward at a substantially middle portion of the inner peripheral surface, and outer rolling surfaces 51b and 51c are formed on inner peripheral surfaces on both sides of the annular convex portion 51a. Yes. The outer ring 51 has an outer peripheral surface fitted into a hole in the housing 54, and a flange 51 d formed at one end is brought into contact with the end surface of the housing 54 to perform axial positioning. An annular recess 51e is formed on the outer peripheral surface of the outer ring 51 by the annular protrusion 51a. The annular recess 51e is filled with an adhesive, and the outer ring 51 is fixed to the hole of the housing 54.

  On the other hand, the inner rings 52 and 53 are respectively fitted inside the double row outer raceway surfaces 51b and 51c of the outer ring 51 from both sides in the axial direction. Curved shoulder portions 52a and 53a are formed on the outer circumferences of the outer ends in the axial direction of the inner rings 52 and 53, and inner rolling surfaces 52b and 53b are formed on the curved shoulder portions 52a and 53a. The double rows of balls 56, 56 are arranged between the inner rolling surfaces 52b, 53b and the outer rolling surfaces 51b, 51c of the outer ring 51, and are retained by the cages 57, 57 for each row. Is retained.

  On the inner peripheral surfaces of the inner rings 52 and 53, fitting portions 52c and 53c that are fitted into the shaft member 55 with clearance are formed. After the inner rings 52, 53 are fitted into the shaft member 55 in the axial direction, a cylindrical weight 59 having a constant weight is placed on the curved shoulder 52 a of one inner ring 52, and the weight of the weight 59 The other inner ring 53 is pressed via the inner ring 52, the ball 56, the outer ring 51, and the ball 56, and the curved shoulder portion 53 a is fitted until it comes into contact with the flange portion 55 a of the shaft member 55. Thereby, an appropriate preload is set for the angular ball bearing 50.

When this gap fitting is completed, the adhesive 60 is filled in the gap between the curved shoulder portion 52a of the one inner ring 52 and the shaft member 55, and this adhesive 60 prevents the one inner ring 52 from being fitted off. The flange portion 55a of the shaft member 55 prevents the other inner ring 53 from being fitted off.
Japanese Utility Model Publication No. 6-1835

  However, when this type of angular contact ball bearing made of a press is used as a wheel bearing, the so-called contact ellipse of the ball 56 rides up and disengages from the outer rolling surface 51b due to a moment load applied when the vehicle turns or the like. Shoulder climb may occur. Then, there is a fear that edge loading may occur in the shoulder A due to the riding on the shoulder. Here, the edge load is an excessive stress concentration generated at a corner or the like, and refers to an event that becomes one of the factors of early peeling.

  Therefore, if the shoulder height from the groove bottom of the outer rolling surface 51b to the annular convex portion 51a is increased, the contact ellipse of the ball 56 can be prevented from climbing over the shoulder A when a turning moment is applied, but the shoulder height is increased. Then, there is a possibility that the squeezing ratio becomes high and cracks may occur in the shoulder A. Therefore, in order to secure an appropriate shoulder height, the center portion of the outer ring 51 is recessed to the shoulder A when the outer ring 51 is rolled. I try to satisfy the material.

  On the other hand, when the outer rolling surface 51b is ground in order to improve the bearing accuracy, an edge is generated in the shoulder A, and the contact ellipse of the ball 56 may run on the edge of the shoulder A. As a result, an edge load may occur in the shoulder A, leading to a reduction in bearing life.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a wheel bearing and a wheel bearing device including the wheel bearing that are designed to be lighter, more compact and lower in cost and to improve the durability of the bearing. It is intended to provide.

In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and the double-row on the outer periphery. A pair of inner rings formed with an arcuate inner rolling surface facing the outer rolling surface, and a double row of balls accommodated between the inner ring and both rolling surfaces of the outer member, the inner ring In the wheel bearing that constitutes a back-to-back type double row angular contact ball bearing by abutting the end surfaces on the small diameter side in a butted state, the outer member and the inner ring are formed from a pipe material by rolling, and the outer member An annular convex portion is formed in a flat shape on the inner periphery with the central portion of the outer surface being recessed, and a shoulder portion connected to the annular convex portion from the outer rolling surface is ground simultaneously with the outer rolling surface by a general grindstone. is processed, it is formed in a circular arc shape, the inner diameter of the annular convex portion, Lorin It is formed with a minute step and said shoulder portion by machining.

In this way, in the wheel bearing constituted by the back-to-back type double row angular contact ball bearings, the outer member and the inner ring are formed by rolling from the pipe material, and the central part of the outer member is recessed to the inner periphery. an annular convex portion is formed in a flat shape, a shoulder portion leading from the outer raceway surfaces on the annular convex portion, is simultaneously grinding the outer raceway surfaces by forming grindstone, it is formed in a circular arc shape, the annular projection The inner diameter of the shoulder is formed with a small step from the shoulder by rolling processing , ensuring the desired bearing accuracy and preventing the shoulder from cracking, and the shoulder is smooth from the outer rolling surface The shoulder can be filled with material to ensure the appropriate shoulder height between the outer rolling surface and the annular convex part. To occur Can be stopped, it is possible to provide a wheel bearing with an improved durability of the bearing.

The invention according to claim 2 of the present invention includes an outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and an outer rolling surface of the double-row on the outer periphery. A pair of inner rings formed with opposing arc-shaped inner rolling surfaces, and a double row of balls accommodated between the inner rings and both rolling surfaces of the outer member; In a wheel bearing that forms a back-to-back type double row angular contact ball bearing by abutting in a butted state, the outer member and the inner ring are formed by rolling from a pipe material, and the central portion of the outer member is recessed. Further, an annular convex portion is formed in a flat shape on the inner periphery, and both end surfaces of the outer member and the large-diameter side end surface of the inner ring are turned after rolling, and the outer diameter surface and inner ring of the outer member are also turned. The inner diameter surface and the end surface on the small diameter side are ground to the specified dimensions and accuracy. Since the shoulder portion connected to the annular convex portion from the outer rolling surface is ground simultaneously with the outer rolling surface by a general-purpose grindstone and is formed in an arc shape, a desired bearing accuracy can be obtained. To prevent the shoulder from cracking, and the shoulder smoothly connects from the outer rolling surface, preventing the ball contact ellipse from climbing over the shoulder and causing edge load when a turning moment is applied. The durability of the bearing can be improved. Moreover, the bearing accuracy equivalent to that of a conventional forged and machined bearing can be ensured.

  In addition, as in the invention according to claim 3, if the outer rolling surfaces of the double row are simultaneously ground by a general-purpose grindstone, the number of processing steps can be reduced, and the cost can be reduced. The groove diameter difference and pitch of the double row outer raceway can be regulated to a predetermined accuracy, and the bearing accuracy can be further improved.

According to a fourth aspect of the present invention, the wheel according to claim 4 has a wheel mounting flange integrally formed at one end, and a hub wheel formed with a small-diameter stepped portion extending in the axial direction from the wheel mounting flange via the shoulder. And a wheel bearing according to any one of claims 1 to 3 that is press-fitted into the small-diameter step portion of the hub wheel through a predetermined shimiro, and the outer joint member of the constant velocity universal joint is serrated on the hub wheel. And the pair of inner rings are sandwiched between a shoulder portion of the hub wheel and a shoulder portion of the outer joint member, and a predetermined bearing preload is applied.

  Thus, in the wheel bearing device of the first generation structure, a hub wheel having a wheel mounting flange integrally formed at one end and a small-diameter step portion extending in the axial direction from the wheel mounting flange via the shoulder is formed. And a wheel bearing according to any one of claims 1 to 4, which is press-fitted into the small-diameter step portion of the hub wheel via a predetermined shimiro, and the outer joint member of the constant velocity universal joint serrated on the hub wheel. And the pair of inner rings are sandwiched between the shoulder part of the hub wheel and the shoulder part of the outer joint member, and a predetermined bearing preload is applied. Rolling fatigue life is improved.

The wheel bearing according to the present invention includes an outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and an arc-shaped inner surface facing the outer-rolling surface of the double-row on the outer periphery. A pair of inner rings formed with rolling surfaces, and a double row of balls accommodated between the inner rings and both rolling surfaces of the outer member, the end surfaces on the small diameter side of the inner ring abut each other in a butted state. In the wheel bearing constituting the back-to-back type double row angular contact ball bearing, the outer member and the inner ring are formed by rolling from a pipe material, and the central part of the outer member is recessed and annular on the inner periphery. with the convex portion is formed in a flat shape, the shoulder portion from the outer raceway surfaces leading to the annular convex portion, is simultaneously grinding and the outer raceway surfaces by forming grindstone, is formed in a circular arc shape, the annular The inner diameter of the convex part is slightly stepped from the shoulder part by rolling. Because it is formed with, as well as prevent cracking from occurring in the shoulder portion to secure the desired bearing precision, smooth connection shoulders from the outer rolling surface, the outer rolling by satisfying the material in the shoulder portion The shoulder height between the running surface and the ring-shaped convex part can be secured appropriately, and the contact ellipse of the ball can ride on the shoulder part when a turning moment is applied, preventing edge load from occurring, and the durability of the bearing It is possible to provide a wheel bearing with improved performance.
Further, the wheel bearing according to the present invention includes an outer member in which a double row arc-shaped outer rolling surface is integrally formed on the inner periphery, and an arc shape facing the outer surface of the double row on the outer periphery. A pair of inner rings formed with inner rolling surfaces of the inner ring, and a double row of balls accommodated between the inner rings and the rolling surfaces of the outer member. In the wheel bearing constituting the back-to-back type double row angular contact ball bearing, the outer member and the inner ring are formed by rolling from a pipe material, and the inner part is recessed by recessing the central part of the outer member. An annular convex portion is formed in a flat shape, both end surfaces of the outer member and the large-diameter side end surface of the inner ring are turned after rolling, and the outer surface of the outer member and the inner surface of the inner ring The end face on the small diameter side is formed with the specified dimensions and accuracy by grinding. In both cases, the shoulder connecting from the outer rolling surface to the annular convex portion is ground simultaneously with the outer rolling surface by a general-purpose grindstone and is formed in an arc shape, so that the desired bearing accuracy is ensured. It prevents the shoulder from cracking, and the shoulder connects smoothly from the outer rolling surface, preventing the ball contact ellipse from climbing over the shoulder when a turning moment is applied and causing edge loading. The durability of the bearing can be improved. Moreover, the bearing accuracy equivalent to that of a conventional forged and machined bearing can be ensured.

  A pair of outer members in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and an arc-shaped inner rolling surface facing the outer-rolling surface of the double-row is formed on the outer periphery. A back-to-back type double row angular contact comprising an inner ring and a double row of balls accommodated between both rolling surfaces of the inner ring and the outer member, wherein the end faces on the small diameter side of the inner ring abut each other in a butted state. In the wheel bearing constituting the ball bearing, the outer member and the inner ring are formed by rolling from a pipe material, the central portion of the outer member is recessed, and the annular convex portion is formed in a flat shape on the inner periphery. The inner diameter of the annular convex portion is formed with a minute step from the shoulder connected to the annular convex portion from the outer rolling surface, and the shoulder portion is ground simultaneously with the outer rolling surface by a general-purpose grindstone. It is formed in an arc shape.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
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 showing the wheel bearing of FIG. 1, and FIG. 3 (a) is a single outer member of FIG. FIG. 4B is a longitudinal sectional view showing the single inner ring of FIG. 2, FIG. 4A is an explanatory view showing grinding of the outer rolling surface of the outer member, and FIG. It is explanatory drawing which shows another grinding process same as the above. 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 has a first generation structure, and includes a hub wheel 1 and a wheel bearing 2 attached to the hub wheel 1. A constant velocity universal joint 3 is fitted into the hub wheel 1 so as to be able to transmit torque, and the hub wheel 1 and the constant velocity universal joint 3 are detachably integrated via a fixing nut 4.

  The hub wheel 1 has a wheel mounting flange 5 for mounting a wheel (not shown) at one end portion on the outer side, and a cylindrical shape extending from the wheel mounting flange 5 to the outer periphery in the axial direction via a shoulder portion 1a. A small-diameter step portion 1b is formed, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. The hub wheel 1 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and remains as forged. In addition, a method of performing a tempering treatment after forging in order to increase the fatigue strength with respect to the bending strength, or by subjecting the surface hardness to a range of 58 to 64 HRC by induction hardening from the shoulder portion 1a to the small diameter step portion 1b. May be.

  The wheel bearing 2 is fitted into a knuckle 6, and as shown in an enlarged view in FIG. 2, an outer member (outer ring) 7 in which double-row arc-shaped outer rolling surfaces 7a and 7a are formed on the inner periphery. A pair of inner rings 8 and 8 having arcuate inner rolling surfaces 8a and 8a formed on the outer periphery and facing these double-row outer rolling surfaces 7a and 7a, and cages 9 and 9 between both rolling surfaces. And the double-row balls 10 and 10 accommodated so as to be freely rollable via each other, and the seals 11 attached to both ends of the outer member 7. The small diameter (front) side end faces 8b, 8b of the inner rings 8, 8 are abutted in a butted state to constitute a so-called back-to-back type double row angular ball bearing.

  The seal 11 is composed of a core metal 11a fitted to the cylindrical portion 13 of the outer member 7, and a seal member 11b integrally joined to the core metal 11a by vulcanization adhesion or the like, and made of an elastomer such as nitrile rubber, It has a pair of radial lips. In addition, leakage of grease sealed in the bearing and foreign matter such as rainwater and dust from the outside are prevented from entering the bearing. Although not shown, a slinger is press-fitted into the outer diameter of the inner ring, and a seal is mounted on the cylindrical portion 13 of the outer member 7 so as to face the slinger. A pack seal may be used.

  As shown in FIG. 1, the constant velocity universal joint 3 includes an outer joint member 15, a joint inner ring 16, a cage 17, and a torque transmission ball 18. The outer joint member 15 integrally includes a cup-shaped mouth portion 19, a shoulder portion 20 that is a bottom portion of the mouth portion 19, and a shaft portion 21 that extends from the shoulder portion 20 in the axial direction. A serration 21a that engages with the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 21, and a male screw 21b is formed at the end of the serration 21a. The outer joint member 15 is fitted into the hub wheel 1 via the serrations 1c and 21a until the shoulder 20 abuts the large end surface of the inner ring 8, and the pair of inner rings 8 and 8 is the shoulder 1a of the hub ring 1. The outer joint member 15 is press-fitted into the small-diameter step portion 1b of the hub wheel 1 through a predetermined squeeze while being sandwiched between the shoulder portions 20 of the outer joint member 15. Further, a predetermined bearing preload is applied to the male screw 21b by tightening the fixing nut 4 with a predetermined tightening torque. As a result, the bearing rigidity is increased and the rolling fatigue life of the bearing is improved.

  Here, the outer member 7 and the inner ring 8 are formed by cold rolling a pipe material made of bearing steel such as SUJ2 or carburized steel such as SCr420 and SCM415. Then, SUJ2 is hardened to a surface hardness of 50 to 64 HRC by submerged or induction hardening, and carburized steel is carburized and quenched. Other examples of the material of the outer member 7 and the inner ring 8 include carbon steel such as SCM440, cold rolled steel plate (JIS standard SPCC system, etc.), S53C, and the like. In the case of cold rolled steel or carbon steel, at least the outer member 7 has double-row outer rolling surfaces 7a and 7a, and in the inner ring 8, the inner rolling surface 8a has a surface hardness of 50 by induction hardening. A hardening treatment is applied in a range of ˜64 HRC to improve the rolling fatigue life. These rolling surfaces 7a and 8a are formed with predetermined dimensions and accuracy by grinding. After that, superfinishing is performed as necessary.

Next, the configuration of the outer member 7 and the inner ring 8 will be described in detail with reference to FIG.
The outer member 7 includes, as shown in (a), an annular protrusion 12 that protrudes radially inward from the pipe material that is the raw material by cold rolling, and both sides of the annular protrusion 12. In addition, double-row arc-shaped outer rolling surfaces 7a and 7a are formed, and cylindrical portions 13 and 13 serving as fitting portions of the seal 11 are formed at both ends. And this cylindrical part 13 including the double row outer side rolling surfaces 7a and 7a mentioned later is formed with a predetermined | prescribed dimension and precision by grinding after cold rolling. Note that both end surfaces where burrs are generated in the rolling process are turned after the rolling process. Moreover, a grinding process is given as needed.

  Here, in order to appropriately secure the shoulder height of the annular convex portion 12 from the outer rolling surface 7a, the inner diameter of the annular convex portion 12 is formed in a flat shape during the rolling process of the outer member 7, and the outer side The central portion of the member 7 is recessed so that the shoulder portion 22 is filled with the material.

  On the other hand, as shown in (b), the inner ring 8 has an arcuate inner raceway surface 8a on the outer periphery and extends in the axial direction from the inner raceway surface 8a by cold rolling from a pipe material as a raw material. A shoulder 14 is formed. Here, the shoulder portion 14 becomes a seal land portion of the seal 11 and is ground at the same time as the inner rolling surface 8a after cold rolling, and is formed with a predetermined size and accuracy. As with the outer member 7, both end surfaces where burrs are generated in the rolling process are turned after the rolling process. Moreover, a grinding process is given as needed.

  In this embodiment, the outer member 7 and the inner ring 8 are formed by cold rolling from a pipe material, and the cylindrical portion of the outer member 7 that serves as a fitting surface between the rolling surfaces 7 a and 8 a and the seal 11. 13 and the shoulder portion 14 of the inner ring 8 that becomes the land portion of the seal 11 are formed by grinding, so that the productivity is improved, the yield is good, the cost can be reduced, and the conventional bearing Equivalent accuracy and sealing performance can be ensured.

  Here, as shown in FIG. 4 (a), the shoulder 22 connected from the outer rolling surface 7a to the annular convex portion 12 is ground simultaneously with the outer rolling surface 7a by the general-purpose grindstone 23 after the heat treatment ( The shoulder 22 after the rolling process is indicated by a two-dot chain line in the figure). That is, the general-purpose grindstone 23 has a small-diameter portion 23a formed to have a small diameter avoiding the annular convex portion 12, a groove 23b corresponding to the outer rolling surface 7a, and a corner portion 23c corresponding to the shoulder portion 22 in advance. It is molded by a rotary dresser. And the corner | angular part 23c is formed in the circular arc shape which consists of predetermined | prescribed curvature radius R, and is connected smoothly from the groove part 23b. This ensures the desired bearing accuracy, prevents the shoulder 22 from cracking, and prevents the contact ellipse of the ball 10 from climbing over the shoulder 22 when a turning moment is applied, causing an edge load. It is possible to provide the wheel bearing 2 that can be prevented and the durability of the bearing is improved.

  Although not shown, double-row grooves 23b and 23b corresponding to double-row outer rolling surfaces 7a and 7a are formed in the general-purpose grindstone 23, and the double-row outer rolling surfaces 7a and 7a and their respective shoulders are formed. You may make it grind the part 22 simultaneously. As a result, the number of processing steps can be reduced, the cost can be reduced, and the groove diameter difference and pitch (inter-groove distance) of the double row outer rolling surfaces 7a, 7a can be regulated to a predetermined accuracy. The bearing accuracy can be further improved.

  FIG. 4B shows a modified example of FIG. The inner diameter of the annular protrusion 25 in the outer member 24 is formed with a shoulder 26 and a minute step δ by rolling. And the shoulder part 26 is ground simultaneously with the outer side rolling surface 7a by the total type grindstone 27 after heat processing. In this general-purpose grindstone 27, a small-diameter portion 27a formed to have a small diameter while avoiding the annular convex portion 25, a groove 27b corresponding to the outer rolling surface 7a, and a corner portion 27c corresponding to the shoulder portion 26 have a rotary dresser in advance. Is molded by. The corner portion 27c is formed in an arc shape having a predetermined curvature radius R, and is smoothly connected from the groove portion 27b to the small diameter portion 27a. Thereby, at the time of a rolling process, while preventing a crack from generating in the shoulder part 26, the shoulder part 26 is filled with a raw material, and the shoulder height of the outer side rolling surface 7a and the annular convex part 25 is ensured appropriately. At the same time, the edge of the shoulder portion 26 can be eliminated to prevent the contact ellipse of the ball 10 from riding on the shoulder portion 26 when a turning moment is applied, thereby preventing an edge load from occurring.

  Here, the outer member 7 (24) and the inner ring 8 are formed by cold rolling, but the present invention is not limited to this, and the outer member 7 (24) and the inner ring 8 may be formed by warm rolling. The outer diameter surface of the outer member 7 serving as one fitting surface, the inner diameter surface of the inner ring 8, and the end surface 8b on the small diameter side of the inner ring 8 serving as a butting surface may be formed by grinding. Thereby, the bearing accuracy equivalent to the conventional forged and machined bearing can be ensured.

  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 first generation structure including a hub wheel integrally having a wheel mounting flange at one end and a pair of inner rings press-fitted into the hub wheel. .

It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. It is an enlarged view which shows the wheel bearing of FIG. (A) is a longitudinal cross-sectional view which shows the outer member ring single-piece | unit of FIG. (B) is the longitudinal cross-sectional view which shows an inner ring single-piece | unit as above. (A) is explanatory drawing which shows the grinding process of an outer member. (B) is explanatory drawing which shows the modification of (a). It is a longitudinal cross-sectional view which shows the angular contact ball bearing of the structure where the conventional inner and outer ring | wheel was formed by press work.

Explanation of symbols

1 ······················ Hub wheel 1a, 14, 20, 22, 26 ... shoulder 1b ······ Small diameter Stepped portion 1c, 21a ... Serration 2 ... Wheel bearing 3 ...・ ・ ・ ・ Constant velocity universal joint 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6 ・ ・..... Knuckles 7, 24 ..... Outer member 7a ... Outer rolling surface 8 ... Inner ring 8a ... Inner rolling surface 8b ...・ ・ ・ ・ ・ ・ ・ ・ Small-diameter end face 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 10 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・········································································ 11・ ・ ・ ・ ・ Seal member 12, 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Nuclear convex 13 ・ ・ ・ ・ ・ ・ ・ ・ Cylinder 15 ・ ・ ・ ・ ・ ・ ・ ・Outer joint member 16 ... Inner joint ring 17 ... Cage 18 ... ... Torque transmission ball 19 ... Mouse part 21 ... Shaft 21b ··········································································································· Part 23b, 27b ......... groove 23c, 27c ... ... Angular part 50 ... Angular contact ball bearings 51 ... Outer ring 51a ... ········································ Outside rolling surface 51d ··············································································································· Curved shoulders 52b, 53b・ ・ ・ ・ Inner rolling surface 52c, 53c ・ ・ ・ ・ ・ ・ Fitting part 54 ・ ・ ・ ・ ・ ・ Housing 55 ..... Shaft member 55a ..... Bridge part 56 ..... Ball 57 ... .... Retainer 59 ...・ Weight 60 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Adhesive A ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Shoulder R ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ Curvature radius δ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ step

Claims (4)

An outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery;
A pair of inner rings each having an arcuate inner rolling surface facing the double row outer rolling surface on the outer periphery;
The inner ring and a double row ball accommodated between both rolling surfaces of the outer member, and a small diameter side end face of the inner ring abuts in a butted state to form a back-to-back type double row angular ball bearing. In the wheel bearing that constitutes,
The outer member and the inner ring are formed from a pipe material by rolling, the central portion of the outer member is recessed, an annular protrusion is formed in a flat shape on the inner periphery, and the annular ring is formed from the outer rolling surface. A shoulder connected to the convex portion is ground simultaneously with the outer rolling surface by a general-purpose grindstone and formed into an arc shape, and an inner diameter of the annular convex portion is formed with a small step from the shoulder portion by rolling. Wheel bearings characterized by An outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery ;
A pair of inner rings each having an arcuate inner rolling surface facing the double row outer rolling surface on the outer periphery;
The inner ring and a double row ball accommodated between both rolling surfaces of the outer member, and a small diameter side end face of the inner ring abuts in a butted state to form a back-to-back type double row angular ball bearing. In the wheel bearing that constitutes,
The outer member and the inner ring are formed from a pipe material by rolling, the center part of the outer member is recessed, and the annular protrusion is formed in a flat shape on the inner periphery, and both end faces of the outer member and the inner ring The large-diameter end surface of the outer member is turned after rolling, and the outer diameter surface of the outer member, the inner diameter surface of the inner ring, and the small-diameter end surface are formed with a predetermined size and accuracy by grinding, and the outer rolling A wheel bearing characterized in that a shoulder connected from the running surface to the annular convex portion is ground at the same time as the outer rolling surface by a general-purpose grindstone and is formed in an arc shape.   The wheel bearing according to claim 1 or 2, wherein the double-row outer rolling surface is ground by a grindstone at the same time. A hub wheel integrally having a wheel mounting flange at one end and having a small-diameter step portion extending in the axial direction from the wheel mounting flange via a shoulder portion, and a predetermined squeeze through a small-diameter step portion of the hub wheel The wheel bearing according to any one of claims 1 to 3 , wherein the outer joint member of the constant velocity universal joint is fitted into the hub wheel via a serration, and the pair of inner rings are the hub. A wheel bearing device characterized by being sandwiched between a shoulder portion of a ring and a shoulder portion of the outer joint member and given a predetermined bearing preload.

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