WO2011152497A1

WO2011152497A1 - Bearing apparatus for wheel

Info

Publication number: WO2011152497A1
Application number: PCT/JP2011/062727
Authority: WO
Inventors: 井上　靖之; 山本　一成
Original assignee: Ntn株式会社
Priority date: 2010-06-03
Filing date: 2011-06-02
Publication date: 2011-12-08
Also published as: JP2011252552A

Abstract

Provided is a bearing apparatus for a wheel having first to third generation structures, in which an inner ring is fixed by oscillation staking of a hub ring. The bearing apparatus improves durability by suppressing deformation of the inner ring that accompanies the staking process and increases product quality by preventing generation of remaining black scale in a width grinding process for the inner ring. A bearing apparatus for a wheel in which an inner ring (3) is axially fixed by a staking part (2c) formed by plastic deformation of an end of a small-diameter step part (2b) in the outward radial direction, wherein an outer diameter part (a) of the inner ring (3) has a larger diameter than a pitch circle diameter (PCD) of a ball (6), and a chamfered part (12) is formed in the angle between the outer diameter part (a) and a large end surface (3b) of the inner ring (3). The chamfered part (12) comprises an arc surface (12b) and a tapered surface (12a) formed inclining from a position approximately 4 mm away from the outer diameter of the staking part (2c), and in addition the ratio of a grinding width (B) of the large end surface (3b) of the inner ring (3) to a grinding width (A) of a small end surface (3c) is B/A≤10, and the ratio of the grinding width (B) to a thickness (C) is B/C≤0.8.

Description

Wheel bearing device

The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like with respect to a suspension device, and more particularly to a self-retained structure in which an inner ring is fixed by swinging and tightening a hub ring, thereby increasing the rigidity of the inner ring. The present invention relates to a wheel bearing device that suppresses deformation of an inner ring accompanying caulking and improves the quality of the inner ring.

2. Description of the Related Art Wheel bearing devices for vehicles such as automobiles are those that rotatably support a wheel via a double row rolling bearing with respect to a suspension device, and there are a drive wheel and a driven wheel. As the wheel bearing device, a double-row angular ball bearing having a desired bearing rigidity, exhibiting durability against misalignment, and having a small rotational torque from the viewpoint of improving fuel efficiency is often used. As a typical example of the conventional structure, a wheel bearing device for a driven wheel as shown in FIG. 4 is known. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

This wheel bearing device is referred to as the third generation, and the hub wheel 51 and the double row rolling bearing 52 are configured as a unit. The double row rolling bearing 52 includes an inner member 53, an outer member 54, and

double row balls

55, 55 accommodated between the

members

53, 54 so as to roll freely. The inner member 53 refers to a hub wheel 51 and an inner ring 57 that is press-fitted and fixed to the hub wheel 51.

The hub wheel 51 integrally has a wheel mounting flange 56 for attaching a wheel (not shown) to an end portion on the outer side, and a hub bolt 56a for fastening the wheel at a circumferentially equidistant position of the wheel mounting flange 56. Has been planted. Further, one (outer side) inner rolling surface 51a and an axial small-diameter step portion 51b extending in the axial direction from the inner rolling surface 51a are formed on the outer periphery, and an inner ring 57 is formed on the small-diameter step portion 51b. It is press-fitted through shimeshiro. The end portion of the small diameter step portion 51b is plastically deformed radially outward to form a crimped portion 51c, and the inner ring 57 is fixed to the hub wheel 51 in the axial direction by the crimped portion 51c. An inner raceway 57a on the other (inner) side is formed on the outer periphery of the inner ring 57.

On the other hand, the outer member 54 integrally has a vehicle body mounting flange 54b fixed to a knuckle (not shown) constituting a suspension device on the outer periphery, and double row inner rolling of the inner member 53 on the inner periphery. Double row outer

rolling surfaces

54a, 54a facing the

surfaces

51a, 57a are formed. The double-row rolling bearing 52 holds the double-

row balls

55, 55 accommodated between the

rolling surfaces

54a, 51a and 54a, 57a, and the double-

row balls

55, 55 so as to roll freely.

Instruments

58 and 58.

A seal 59 and a sensor cap 60 are attached to both ends of the outer member 54 to seal the opening of the annular space formed between the outer member 54 and the inner member 53. The seal 59 and the sensor cap 60 prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater and dust from the outside into the bearing.

Here, the pulsar ring 61 is press-fitted into the outer diameter portion 57 b of the inner ring 57. The pulsar ring 61 includes a support ring 62 formed in an annular shape, and a magnetic encoder 63 integrally joined to the side surface of the support ring 62 by vulcanization adhesion or the like. The magnetic encoder 63 constitutes a rotary encoder for detecting the rotational speed of the wheel by mixing magnetic powder such as ferrite in an elastomer such as rubber and alternately magnetizing the magnetic poles N and S in the circumferential direction.

The support ring 62 is formed from a ferromagnetic steel plate by pressing to have a substantially L-shaped cross section, and a cylindrical portion 62a that is press-fitted into the outer diameter portion 57b of the inner ring 57, and extends radially inward from the cylindrical portion 62a. And a standing plate portion 62b. A magnetic encoder 63 is joined to the inner side surface of the upright plate portion 62b.

The sensor cap 60 is fitted and fixed to the opening end of the outer member 54 on the inner side, and closes the opening of the outer member 54. The sensor cap 60 includes a bottomed cylindrical cap body 64 formed by injection molding a synthetic resin, and a cored bar 65 integrally molded in the opening of the cap body 64.

A mounting portion 66 protruding in the axial direction is integrally formed on the radially outer portion of the cap body 64, and an insertion hole 67 is formed at a position corresponding to the magnetic encoder 63 of the mounting portion 66. An annular groove 67a is formed in the insertion hole 67, and the sensor unit 69 is inserted through an elastic ring 68 such as an O-ring. As a result, the amount of eccentricity of the annular groove 67a can be regulated to a predetermined value, and sealing performance can be secured to prevent foreign matters such as rainwater and dust from entering the cap 60 from the outside (for example, , See Patent Document 1).

JP 2005-233234 A

However, in this conventional wheel bearing device, when the end portion of the small diameter step portion 51b of the hub wheel 51 is swung and swaged, the inner ring 57 is pushed outward in the radial direction. Here, since the inner ring 57 is deformed, a large hoop stress is generated in the outer diameter portion 57b and the durability may be lowered. Therefore, the outer diameter portion 57b of the inner ring 57 has a large diameter of the inner raceway surface 57a. In some cases, it extends in a spire shape from the side, and the outer diameter D is formed larger than the pitch circle diameter PCD of the balls 55.

In this case, the grinding width of the large end surface 71 is increased with respect to the grinding width of the small end surface 70 of the inner ring 57. When the grinding width ratio between the small end surface 70 and the large end surface 71 of the inner ring 57 is increased, not only the cycle time during width grinding of the inner ring 57 is increased, but also a so-called black skin residue is generated, in which turning marks remain on the large end surface 71. There is a fear. That is, since the small end face 70 and the large end face 71 are ground simultaneously, setting the cycle time on the large end face 71 side increases the cycle time on the small end face 70 side. If the time is set as the cycle time on the 70 side, the grinding of the large end surface 71 is not completed, and there is a possibility that a black skin residue may occur.

The present invention has been made in view of such a conventional problem. In the wheel bearing device of the first to third generation structure in which the inner ring is fixed by the rocking caulking of the hub ring, it is accompanied by caulking. An object of the present invention is to provide a wheel bearing device that improves the product quality by suppressing the deformation of the inner ring and improving the durability, and preventing the black skin residue in the width grinding process of the inner ring.

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 outer rolling surface is integrally formed on the inner periphery, and a wheel for attaching a wheel to one end. A hub wheel having a mounting flange integrally formed with a small-diameter step portion extending in the axial direction from the wheel mounting flange, and at least one inner ring press-fitted into the small-diameter step portion of the hub wheel via a predetermined shimoshiro And an inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery, and a cage is provided between both rolling surfaces of the inner member and the outer member. The inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end portion of the small-diameter step portion radially outward. In the wheel bearing device, the outer diameter of the inner ring is larger than the pitch circle diameter of the rolling elements. Is formed in a ratio B / A of the grinding width A of the grinding width B and the small end surface of the large end face of the inner ring is set to B / A ≦ 10.

In this way, the inner ring is fixed in the axial direction with respect to the hub wheel by the crimping part formed by press-fitting the inner ring into the small diameter step part of the hub wheel and plastically deforming the end of the small diameter step part radially outward. In the self-retained wheel bearing device, the outer diameter of the inner ring is formed to be larger than the pitch circle diameter of the rolling elements, and the grinding width B of the large end face of the inner ring and the grinding width A of the small end face Since the ratio B / A is set to B / A ≦ 10, it is possible to improve the durability by suppressing deformation of the inner ring due to the caulking process, and to prevent the black skin residue in the inner ring width grinding process. A wheel bearing device with improved quality can be provided.

Preferably, as in the invention described in claim 2, the ratio B / C between the grinding width B of the large end face of the inner ring and the wall thickness C of the inner ring is set to B / C ≦ 0.8. As a result, the cycle time during the inner ring width grinding is reduced, and the black skin remaining on the large end face can be reliably prevented.

Further, as in the invention described in claim 3, a chamfered portion is formed at a corner portion between the large end surface of the inner ring and the outer diameter, and the chamfered portion has an outer diameter of the caulking portion and a predetermined radial dimension. If it is formed through a surface drawn from the position separated from the inner ring to the inner raceway surface side of the inner ring, it is possible to improve the durability by suppressing deformation of the inner ring accompanying caulking.

Further, as in the invention described in claim 4, if the chamfered portion is formed at a position approximately 4 mm away from the outer diameter of the caulking portion, a dial gauge is attached to the large end surface of the inner ring during caulking. The amount of movement of the inner ring can be measured by bringing the measuring terminal into contact with the inner ring and the amount of pushing of the inner ring can be managed.

Further, as in the invention described in claim 5, the chamfered portion may be constituted by an arc surface having a predetermined radius of curvature and a tapered surface formed by inclining from the large end surface.

Further, as in the invention described in claim 6, if the chamfered portion is formed through a step portion having a slight step from the large end surface, the length of the flat portion of the outer diameter portion is secured. Meanwhile, the black skin residue can be prevented.

Further, as in the invention described in claim 7, if the step is set in a range of 0.05 to 1.5 mm, it disappears by grinding the large end face, and the cycle time at the inner ring width grinding is reduced. Without increasing, it is possible to prevent the occurrence of black skin residue on the large end face, and to secure the length of the flat portion of the outer diameter portion of the inner ring and maintain the fitting force such as the seal.

The wheel bearing device according to the present invention integrally has an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange for mounting the wheel at one end. The hub wheel is formed with a small-diameter step portion extending in the axial direction from the mounting flange, and at least one inner ring press-fitted into the small-diameter step portion of the hub ring through a predetermined shimoshiro. An inner member in which a double row of inner rolling surfaces facing the running surface is formed, and a compound member that is rotatably accommodated via a cage between both rolling surfaces of the inner member and the outer member. A wheel bearing device in which the inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end of the small diameter step portion radially outward. The diameter is formed larger than the pitch circle diameter of the rolling elements, and the inner Since the ratio B / A between the grinding width B of the large end face and the grinding width A of the small end face is set to B / A ≦ 10, the deformation of the inner ring associated with the caulking process is suppressed and the durability is improved. At the same time, it is possible to provide a wheel bearing device that prevents black skin residue in the width grinding process of the inner ring and improves product quality.

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 inner ring single-piece | unit of FIG. It is an enlarged view which shows the modification of FIG. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

An outer member integrally having a vehicle body mounting flange to be attached to the vehicle body on the outer periphery, a double row outer rolling surface formed integrally on the inner periphery, and a wheel mounting flange for mounting a wheel on one end A hub wheel integrally formed and formed on the outer periphery with an inner rolling surface facing one of the double row outer rolling surfaces, and a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface; and An inner member composed of an inner ring that is press-fitted into a small-diameter step portion of the hub wheel through a predetermined scissors and has an inner rolling surface that is opposed to the other of the outer rolling surfaces of the double row on the outer periphery; And a double row rolling element accommodated between the rolling surfaces of the outer member and the outer member via a cage, and plastically deforming the end of the small diameter step portion radially outward. In the wheel bearing device in which the inner ring is fixed in the axial direction by the caulking portion formed in the above, The outer diameter of the ring is formed to be larger than the pitch circle diameter of the rolling element, and a chamfered portion is formed at a corner between the large end surface of the inner ring and the outer diameter. And the ratio B / A between the grinding width B of the large end face and the grinding width A of the small end face of the inner ring is comprised of an outer diameter of the portion and a tapered surface inclined from a position separated by about 4 mm. B / A ≦ 10 and the ratio B / C with the wall thickness C of the inner ring is set to B / C ≦ 0.8.

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 showing a single inner ring of FIG. 1, and FIG. 3 is an enlarged view showing a modification of FIG. is there.

This wheel bearing device is referred to as a third generation for driving wheels, and is a double row rolling element (ball) accommodated in a freely rollable manner between the inner member 1, the outer member 10, and both

members

1, 10. 6 and 6. The inner member 1 includes a hub ring 2 and an inner ring 3 that is press-fitted into the hub ring 2 through a predetermined scissors.

The hub wheel 2 integrally has a wheel mounting flange 4 for mounting a wheel (not shown) at an end on the outer side, and a hub bolt for fixing the wheel at a circumferentially equidistant position of the wheel mounting flange 4. 5 is planted. On the outer periphery of the hub wheel 2, one (outer side) inner rolling surface 2a and a cylindrical small-diameter step portion 2b extending in the axial direction from the inner rolling surface 2a via the shoulder portion 11 are formed. The inner ring 3 in which the serration (or spline) 2d for torque transmission is formed on the inner periphery and the other (inner side) inner raceway surface 3a is formed on the outer periphery is press-fitted into the small-diameter step portion 2b via a predetermined shimiro. Has been.

Then, with the small end surface 3c of the inner ring 3 abutted against the shoulder 11 of the hub wheel 2, the end portion of the small diameter step portion 2b is plastically deformed radially outward to form a crimped portion 2c. In other words, the inner ring 3 is sandwiched between the caulking portion 2c and the shoulder portion 11 of the hub wheel 2, and the inner ring 3 is fixed to the hub wheel 2 in the axial direction in a state where a predetermined bearing preload is applied. The caulking portion 2c is formed by rocking caulking in a state where the caulking portion 2c is in close contact with the outer side of the inner ring 3 and presses the large end surface 3b of the inner ring 3 to ensure a desired axial force.

The outer member 10 integrally has a vehicle body mounting flange 10b for mounting to the vehicle body (not shown) on the outer periphery, and double row

outer rolling surfaces

10a, 10a are integrally formed on the inner periphery. And the double row rolling elements 6 and 6 are accommodated between each rolling

surface

10a, 2a and 10a, 3a, and these double row rolling elements 6 and 6 are rollably hold | maintained by the holder |

retainers

7 and 7. ing.

Seals

8 and 9 are attached to the opening of the annular space formed between the outer member 10 and the inner member 1, and leakage of lubricating grease sealed inside the bearing and rainwater and dust from the outside. Etc. are prevented from entering the inside of the bearing.

Here, the wheel bearing device for driving wheels called the third generation in which the inner raceway surface 2a is formed directly on the outer periphery of the hub wheel 2 is illustrated, but the wheel bearing device according to the present invention is The structure is not limited to such a structure, and for example, a first-generation or second-generation structure on the driven wheel or drive wheel side in which a pair of inner rings are press-fitted into the small-diameter step portion of the hub wheel may be used. Moreover, although the wheel bearing apparatus comprised by the double row angular contact ball bearing which used the rolling elements 6 and 6 as the ball was illustrated, it is not restricted to this but is comprised by the double row tapered roller bearing which uses a tapered roller for a rolling element. May be.

The hub wheel 2 is formed of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and the inner ring surface 2a and the inner side of the wheel mounting flange 4 with which the outer seal 8 is in sliding contact. The surface hardness is set in the range of 58 to 64 HRC by induction hardening from the base 4a to the small diameter step 2b. The caulking portion 2c is an unquenched portion that remains in the range of the material surface hardness after forging of 13 to 30 HRC.

On the other hand, the inner ring 3 and the rolling element 6 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core part by quenching. Similarly to the hub wheel 2, the outer member 10 is made of medium and high carbon steel containing 0.40 to 0.80% by weight of carbon such as S53C, and at least the double row outer rolling surfaces 10a and 10a have high frequency. The surface hardness is set to a range of 58 to 64 HRC by quenching.

Here, in this embodiment, the inner ring 3 is formed such that the outer diameter portion a on the large end surface 3b side is larger than the pitch circle diameter PCD of the rolling elements 6. Thereby, rigidity is increased by increasing the thickness of the inner ring 3, deformation of the inner ring 3 associated with caulking is suppressed, hoop stress is effectively prevented, and durability of the inner ring 3 can be improved.

Further, as shown in an enlarged view in FIG. 2, a chamfered portion 12 is formed at a corner portion between the large end surface 3b of the inner ring 3 and the outer diameter portion a. The chamfered portion 12 includes a tapered surface 12a having a predetermined inclination angle θ with respect to the large end surface 3b and an arc surface 12b having a curvature radius r1. The tapered surface 12a is formed to be inclined from a position separated from the outer diameter of the caulking portion 2c by a predetermined dimension W. Here, W is set to about 4 mm. At the time of caulking, in order to manage the pushing amount of the inner ring 3, the measuring amount of the dial gauge is brought into contact with the large end surface 3b of the inner ring 3, and the movement amount is measured. The eccentricity (variation) is set in consideration of ± 1 mm.

Here, the dimension of the outer diameter part a on the large end surface 3b side of the inner ring 3 is D1, the inner diameter dimension is d, the outer diameter dimension on the small end surface 3c side is D2, and the outer diameter side chamfered part on the large end surface 3b side of the inner ring 3 is. 12 and C1 and C2 are the radial dimensions of the chamfered portion 13 on the inner diameter side, and C3 and C4 are the radial dimensions of the chamfered portion 14 on the outer diameter side and the chamfered portion 15 on the inner diameter side on the small end surface 3c side, respectively. The wall thickness C on the large end surface 3b side is C = (D1-d) / 2, the wall thickness E on the small end surface 3c side is E = (D2-d) / 2, and the grinding width B of the large end surface 3b is B = C- (C1 + C2), and the grinding width A of the small end surface 3c is A = E- (C3 + C4).

The large end surface 3b and the small end surface 3c of the inner ring 3 are simultaneously formed by grinding. However, when the grinding width ratio B / A between the large end surface 3b and the small end surface 3c of the inner ring 3 is increased, the cycle time during width grinding of the inner ring 3 is increased. In this embodiment, the ratio B / A between the grinding width B of the large end surface 3b and the grinding width A of the small end surface 3c is caused. The ratio B / C between the grinding width B of the large end face 3b and the thickness C of the inner ring 3 is set to have a predetermined relationship.

The present applicant pays attention to the difference in the shape and dimensions of the inner ring and the relationship between the grinding cycle time and the presence or absence of the remaining black skin, and actually samples a large number of inner rings applied to wheel bearing devices such as automobiles. Width grinding of the inner ring was performed and it was verified that there was a predetermined relationship. The results are shown in Table 1.

As can be seen from Table 1, as the ratio B / A between the grinding width B of the large end surface 3b and the grinding width A of the small end surface 3c decreases, the grinding width B of the large end surface 3b and the thickness C of the inner ring 3 As the ratio B / C decreases, the cycle time during width grinding of the inner ring 3 decreases, and the remaining black skin of the large end surface 3b can be prevented.

Specifically, by setting the ratio B / A between the grinding width B of the large end surface 3b and the grinding width A of the small end surface 3c to B / A ≦ 10, it is possible to prevent the remaining black skin on the large end surface 3b. Further, by setting the ratio B / C between the grinding width B of the large end surface 3b and the wall thickness C of the inner ring 3 to B / C ≦ 0.8, it is possible to reliably prevent the remaining black skin on the large end surface 3b. At the same time, the cycle time during width grinding of the inner ring 3 can be reduced. Thus, in the wheel bearing device of the first to third generation structure in which the inner ring is fixed by swinging and caulking of the hub ring, the inner ring is prevented from being deformed due to the caulking process, and the durability is improved. It is possible to provide a wheel bearing device that prevents black skin residue in the width grinding process and improves product quality.

Also, the inner ring is not limited to the inner ring described above, and may be an inner ring 16 as shown in FIG. That is, the inner ring 16 is formed such that the outer diameter portion a on the large end surface 3b side is larger than the pitch circle diameter PCD of the rolling element 6, and the angle between the large end surface 3b of the inner ring 16 and the outer diameter portion a. An arcuate chamfered portion 17 having a radius of curvature r2 is formed in the portion. The chamfered portion 17 is formed via a stepped portion 18 having a slight step δ from a position separated from the outer diameter of the crimped portion 2c by a predetermined dimension W.

The seal 9 and the like are press-fitted and fixed to the outer diameter portion a of the inner ring 16, but if the chamfered portion 12 is constituted by the tapered surface 12a and the circular arc surface 12b as in the above-described embodiment, the outer diameter portion a. However, if the chamfered portion 17 is formed through a step as in this embodiment, the length of the flat portion of the outer diameter portion a may be reduced. It is possible to prevent black skin residue while ensuring the thickness.

The step δ is set in the range of 0.05 to 1.5 mm. If this step δ is less than 0.05 mm, it disappears due to grinding of the large end surface 3b, and not only the cycle time during the width grinding of the inner ring 16 increases, but also a black skin residue occurs on the large end surface 3b, resulting in turning marks. Remains. On the other hand, when the step δ exceeds 1.5 mm, the length of the flat portion of the outer diameter portion a is shortened and the effect is halved.

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, it can be implemented in the following form. The scope of the present invention is defined by the terms of the claims, and includes the equivalent meanings recited in the claims and all modifications within the scope.

In the wheel bearing device according to the present invention, an inner ring is press-fitted into a small-diameter step portion of a hub wheel, and the inner ring is fixed by a caulking portion formed by plastic deformation of an end portion of the small-diameter step portion. It can be applied to the next generation self-retained wheel bearing device.

DESCRIPTION OF SYMBOLS 1 Inner member 2 Hub wheel 2a, 3a Inner rolling surface 2b Small diameter step part 2c Clamping part 2d Serrations 3, 16 Inner ring 3b Large end surface 3c Small end surface 4 Wheel mounting flange 4a Base part 5 Hub bolt 6 Rolling element 7 Cage 8, 9 Seal 10 Outer member 10a Outer rolling surface 10b Car body mounting flange 11 Shoulders 12, 13, 14, 15, 17 Chamfered portion 12a of inner ring Tapered surface 12b Arc surface 18 Step portion 51 Hub wheels 51a, 57a Inner rolling surface 51b Small diameter step portion 51c Clamping portion 52 Double row rolling bearing 53 Inner member 54 Outer member 54a Outer rolling surface 54b Car body mounting flange 55 Ball 56 Wheel mounting flange 56a Hub bolt 57 Inner ring 57b Outer diameter portion 58 Cage 59 Seal 60 Sensor cap 61 Pulsar ring 62 Support ring 62a Cylindrical part 62b Standing plate part 63 Magnetic encoder 64 Cap book Body 65 Metal core 66 Mounting portion 67 Insertion hole 67a Annular groove 68 Elastic ring 69 Sensor unit 70 Small end surface 71 of inner ring Large end surface a of inner ring Outer diameter portion A on the large end surface side of inner ring Grinding width B on the small end surface side of inner ring Inner ring Grinding width d of inner end of inner ring C Inner ring inner diameter C Inner ring inner wall thickness C1, C2, C3, C4 Radial dimension D of inner ring chamfered portion D1, Inner ring outer end dimension D2 of inner ring Outer diameter dimension E on the small end face side Thickness PCD on the small end face side of the inner ring Pitch circle diameter r1, r2 The radius of curvature W of the chamfered arcuate surface W The separation dimension between the outer diameter of the crimped part and the tapered face δ Inner ring Step θ of the large end face of the taper Inclination angle of the tapered surface of the chamfer

Claims

An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end, a small-diameter step portion extending in the axial direction from the wheel-mounting flange, and a small diameter step portion of the hub wheel via a predetermined shimiro An inner member formed of at least one inner ring press-fitted and formed with a double-row inner rolling surface facing the double-row outer rolling surface on the outer periphery;
A double-row rolling element accommodated between the rolling surfaces of the inner member and the outer member via a cage so as to freely roll,
In the wheel bearing device in which the inner ring is fixed in the axial direction by a caulking portion formed by plastically deforming an end portion of the small diameter step portion radially outwardly,
The outer diameter of the inner ring is formed to be larger than the pitch circle diameter of the rolling elements, and the ratio B / A between the grinding width B of the large end face and the grinding width A of the small end face of the inner ring is B / A The wheel bearing device is set to ≦ 10.
2. The wheel bearing device according to claim 1, wherein a ratio B / C between a grinding width B of a large end surface of the inner ring and a thickness C of the inner ring is set to B / C ≦ 0.8.
A chamfered portion is formed at a corner between the large end surface of the inner ring and the outer diameter, and the chamfered portion is located on the inner rolling surface side of the inner ring from a position separated from the outer diameter of the crimped portion by a predetermined radial dimension. The wheel bearing device according to claim 1, wherein the wheel bearing device is formed through a surface drawn into the wheel.
The wheel bearing device according to any one of claims 1 to 3, wherein the chamfered portion is formed at a position approximately 4 mm away from an outer diameter of the caulking portion.
The wheel bearing device according to claim 4, wherein the chamfered portion includes an arc surface having a predetermined radius of curvature and a tapered surface formed by inclining from the large end surface.
The wheel bearing device according to claim 4 or 5, wherein the chamfered portion is formed through a stepped portion having a slight step from the large end surface.
The wheel bearing device according to claim 6, wherein the step is set in a range of 0.05 to 1.5 mm.