CN220748807U - Bearing device for wheel and vehicle - Google Patents

Bearing device for wheel and vehicle Download PDF

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Publication number
CN220748807U
CN220748807U CN202322224966.0U CN202322224966U CN220748807U CN 220748807 U CN220748807 U CN 220748807U CN 202322224966 U CN202322224966 U CN 202322224966U CN 220748807 U CN220748807 U CN 220748807U
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CN
China
Prior art keywords
wheel
roundness
row
peripheral surface
caulking portion
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Active
Application number
CN202322224966.0U
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Chinese (zh)
Inventor
重冈和寿
马场智子
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NTN Corp
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NTN Corp
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0005—Hubs with ball bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0078—Hubs characterised by the fixation of bearings
    • B60B27/0084—Hubs characterised by the fixation of bearings caulking to fix inner race
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0094—Hubs one or more of the bearing races are formed by the hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/02—Hubs adapted to be rotatably arranged on axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/02—Dead axles, i.e. not transmitting torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/585—Details of specific parts of races of raceways, e.g. ribs to guide the rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The utility model provides a bearing device for a wheel and a vehicle, and aims to improve rigidity of the bearing device for the wheel and realize further light weight. A bearing device (1) for a wheel is provided with: an outer ring (2) having double-row outer raceway surfaces (23, 24); an inner member comprising a hub wheel (3) having a small-diameter stepped portion (31) extending in the axial direction on the outer periphery thereof, and an inner ring (4) press-fitted into the small-diameter stepped portion (31), and having double-row inner raceway surfaces (33, 41) opposed to the double-row outer raceway surfaces (23, 24); and double row ball rows (5, 6) which are housed so as to be capable of rolling between both raceway surfaces of the outer ring (2) and the inner member, wherein the hub wheel (3) has a caulking portion (38) which is caulked to the inner ring (4) at an axial end portion, and the roundness A of an outer peripheral surface (38 a) of the caulking portion (38) is 0.4 or less.

Description

Bearing device for wheel and vehicle
Technical Field
The present utility model relates to a bearing device for a wheel and a vehicle.
Background
Conventionally, a wheel bearing device for rotatably supporting a wheel in a suspension device of a vehicle such as an automobile is known.
In a wheel bearing device of a standard in which a hub wheel and an inner ring are caulked to form an inner member, as described in patent document 1, for example, rolling elements are accommodated between an outer raceway surface of an outer member and an inner raceway surface of an inner member, and a preload is applied between the rolling elements and the inner member and the outer member by caulking the hub wheel and the inner ring.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 11-129703
As described above, in the bearing device for a wheel having the structure in which the hub wheel and the inner ring are swaged, the shape of the swaged portion of the hub wheel with respect to the inner ring affects the magnitude of the preload applied to the bearing device for a wheel and the roundness of the raceway surface.
Therefore, by forming the caulking portion in an appropriate shape, it is possible to apply appropriate preload to the wheel bearing device and to improve the roundness of the raceway surface, thereby improving the steering stability of the vehicle to which the wheel bearing device is mounted and the life of the wheel bearing device.
Disclosure of Invention
Problems to be solved by the utility model
The present utility model has been made in view of the above circumstances, and provides a bearing device for a wheel, which can form a caulking portion of a hub wheel with respect to an inner ring into an appropriate shape, apply appropriate preload, and improve roundness of a raceway surface.
Means for solving the problems
Specifically, the wheel bearing device includes: an outer member having a double-row outer raceway surface on an inner periphery thereof; an inner member which is configured from a hub wheel having a small-diameter stepped portion extending in an axial direction on an outer periphery thereof and at least one inner ring press-fitted into the small-diameter stepped portion of the hub wheel, and which has a double-row inner raceway surface facing the double-row outer raceway surface; and a double row rolling element housed between both raceway surfaces of the outer member and the inner member so as to be freely rolled, wherein the hub wheel has a caulking portion to be caulked to the inner ring at an axial end portion, and a roundness of an outer peripheral surface of the caulking portion is 0.4 or less.
Effects of the utility model
According to the present utility model, the steering stability of the vehicle to which the wheel bearing device is attached and the life of the wheel bearing device can be improved.
Drawings
Fig. 1 is a side sectional view showing a bearing device for a wheel.
Fig. 2 is an enlarged side cross-sectional view showing a caulking portion of the bearing device for a wheel.
Fig. 3 is a side cross-sectional view showing a bearing device for a wheel of the second embodiment.
Fig. 4 is an enlarged side cross-sectional view showing a caulking portion of the bearing device for a wheel according to the second embodiment.
Reference numerals illustrate:
1. bearing device for 1A wheel
2 outer ring
3. 13 hub wheel
4 inner race
5 inner disk side ball row
6 outer disk side rolling ball row
23 Outer track surface (of inner disc side)
24 Outer track surface (of outer disk side)
31. 131 small diameter step part
33. 133 (outer disk side) inner track surface
38. 138 riveted part
38a, 138a outer peripheral surface
38b, 138b axial end face
41 Inner track surface (of inner disk side)
A. Roundness of Aa
B. Ba flatness.
Detailed Description
Hereinafter, a specific embodiment of the present utility model will be described with reference to the drawings.
[ bearing device for wheel ]
The wheel bearing apparatus 1 shown in fig. 1 is an embodiment of the wheel bearing apparatus of the present utility model, and is an apparatus for rotatably supporting a wheel in a suspension apparatus of a vehicle such as an automobile. The wheel bearing apparatus 1 is configured as a wheel bearing apparatus for a driven wheel.
In the following description, the axial direction indicates a direction along the rotation axis X of the wheel bearing apparatus 1. The outer disc side represents one side in the axial direction, that is, the wheel side of the wheel bearing device 1 when mounted on the vehicle body, and the inner disc side represents the other side in the axial direction, that is, the vehicle body side of the wheel bearing device 1 when mounted on the vehicle body.
The wheel bearing apparatus 1 has a structure called a third generation, and includes an outer ring 2 as an outer member, a hub wheel 3 and an inner ring 4 as inner members, and two rows of inner-disk-side bead rows 5 and outer-disk-side bead rows 6 as rolling rows.
An inner-disk-side opening 21 is formed at an inner-disk-side end portion of the outer ring 2, and an outer-disk-side opening 22 is formed at an outer-disk-side end portion of the outer ring 2. The cover 15 is fitted into the inner-disc-side opening 21, and the outer-disc-side sealing member 9 is fitted into the outer-disc-side end portion.
The lid 15 is fitted into the inner-disc-side opening 21, so that the inner-disc-side opening 21 is closed. The outer-disk-side sealing member 9 is fitted into the outer-disk-side opening 22, so that the outer-disk-side opening end of the annular space S formed by the outer ring 2, the hub wheel 3, and the inner ring 4 is closed.
By closing the inner disc side opening 21 with the cover 15 and closing the outer disc side opening end of the annular space S with the outer disc side sealing member 9, penetration of foreign matter such as muddy water into the interior of the wheel bearing apparatus 1 is suppressed.
An outer raceway surface 23 on the inner disk side and an outer raceway surface 24 on the outer disk side are formed on the inner peripheral surface of the outer ring 2. A vehicle body mounting flange 25 for mounting the outer ring 2 to a vehicle body side member is integrally formed on the outer peripheral surface of the outer ring 2. The body mounting flange 25 is provided with bolt holes 26 into which fastening members (bolts in this case) for fastening the body-side member and the outer ring 2 are inserted.
A small diameter step 31 having a smaller diameter than the outer disk side end is formed at the inner disk side end of the outer peripheral surface of the hub wheel 3. A wheel mounting flange 32 for mounting a wheel is integrally formed at an outer disc side end portion of the hub wheel 3.
A plurality of bolt holes 35 are formed in the wheel mounting flange 32. Hub bolts 36 for fastening the hub wheel 3 to the wheel or the brake member can be pressed into the bolt holes 35.
In the hub wheel 3, a sliding contact surface 34 for sliding contact of the outer disc side seal member 9 is formed on the base side of the wheel mounting flange 32. An outer-disc-side inner raceway surface 33 is provided on the outer circumferential surface of the hub wheel 3 so as to face the outer-disc-side outer raceway surface 24 of the outer ring 2. That is, the hub wheel 3 forms the inner raceway surface 33 on the outer disc side of the inner member.
A recess 37 recessed from the outer disk end toward the inner disk end in the axial direction is formed in the inner diameter portion of the hub wheel 3. The concave portion 37 is formed to a position between the inner disc side bead row 5 and the outer disc side bead row 6 in the axial direction.
An inner ring 4 is provided at the small diameter step 31 of the hub wheel 3. The inner ring 4 is fixed to the small diameter stepped portion 31 of the hub wheel 3 by press-fitting and caulking. The inner ring 4 applies a preload to an inner-disk-side bead row 5 and an outer-disk-side bead row 6 as rolling rows. The inner ring 4 has an inner-disk-side end face 42 at an inner-disk-side end. A caulking portion 38 to be caulked with an inner disc side end face 42 of the inner ring 4 is formed at an inner disc side end portion of the hub wheel 3.
An inner raceway surface 41 on the inner disk side is provided on the outer peripheral surface of the inner ring 4 so as to face the outer raceway surface 23 on the inner disk side of the outer ring 2. That is, the inner raceway surface 41 is formed by the inner ring 4 on the inner disc side of the inner member.
The inner-disk-side ball row 5 and the outer-disk-side ball row 6 as rolling rows are configured by a plurality of balls 7 as rolling elements being held by a cage 8. The inner-disc-side ball row 5 is held between the inner raceway surface 41 of the inner ring 4 and the outer raceway surface 23 of the inner ring 2 so as to be freely rotatable. The outer-disc-side bead row 6 is held between the inner raceway surface 33 of the hub wheel 3 and the outer raceway surface 24 of the outer disc side of the outer ring 2 so as to be freely rotatable. That is, the inner bead row 5 and the outer bead row 6 are housed so as to be freely rotatable between both raceway surfaces of the outer member and the inner member.
In the wheel bearing apparatus 1, a double row angular ball bearing is constituted by an outer ring 2, a hub wheel 3, an inner ring 4, an inner disc side ball row 5, and an outer disc side ball row 6. The wheel bearing apparatus 1 may be configured as a double row tapered roller bearing instead of a double row angular contact ball bearing.
[ rivet portion of bearing device for wheel 1]
As shown in fig. 2, the caulking portion 38 of the hub wheel 3 has an outer peripheral surface 38a formed in a circular shape and an axial end surface 38b as an end surface on the inner disc side. The outer peripheral surface 38a of the caulking portion 38 is formed in a circular shape so that the roundness a becomes 0.4 or less (a.ltoreq.0.4).
The roundness a of the outer peripheral surface 38a is a magnitude of deformation with respect to a circumferential circle of the outer peripheral surface 38a, and is represented by a difference in radius between two concentric circles when the outer peripheral surface 38a is sandwiched between the two concentric circles. For example, in the case where the roundness a is 0.4, the outer peripheral surface 38a is limited between two concentric circles whose radii differ by 0.4.
By forming the caulking portion 38 in such a shape that the roundness a of the outer peripheral surface 38a is 0.4 or less in this way, the roundness of the raceway surface such as the inner raceway surface 41 can be improved, and the preload applied to the wheel bearing apparatus 1 can be made to an appropriate value, so that the steering stability of the vehicle to which the wheel bearing apparatus 1 is attached and the life of the wheel bearing apparatus 1 can be improved.
Further, the roundness a of the outer peripheral surface 38a of the caulking portion 38 has a correlation with the starting torque of the wheel bearing apparatus 1, and there is a relationship in which the smaller the roundness a, the smaller the starting torque of the wheel bearing apparatus 1.
TABLE 1
(evaluation result good:. Delta. Ordinary)
For example, as shown in table 1, when the roundness a is 0.1 or less (a.ltoreq.0.1), the magnitude of the starting torque of the wheel bearing apparatus 1 becomes-12% or less, relative to the case where the roundness a is greater than 0.1 and 0.4 or less (0.1 < a.ltoreq.0.4). On the other hand, when the roundness a exceeds 0.4 (0.4 < a), the magnitude of the starting torque of the wheel bearing apparatus 1 becomes +12% or more with respect to the case where the roundness a is larger than 0.1 and not more than 0.4.
Therefore, from the viewpoint of reducing the starting torque of the wheel bearing apparatus 1, the roundness a of the outer peripheral surface 38a of the caulking portion 38 is preferably 0.4 or less. Further, the roundness a of the outer peripheral surface 38a of the caulking portion 38 is more preferably 0.1 or less.
The caulking portion 38 is formed so that the flatness B of the axial end surface 38B becomes 0.2 or less (b.ltoreq.0.2). The flatness B of the axial end surface 38B is a magnitude of deformation with respect to a circumferential plane of the axial end surface 38B, and is expressed by a magnitude of a gap between two parallel planes when the axial end surface 38B is sandwiched between the two planes.
By forming the caulking portion 38 in such a shape that the flatness B of the axial end surface 38B is 0.2 or less, the roundness a of the outer peripheral surface 38a of the caulking portion 38 can be improved, the roundness a of the raceway surface such as the inner raceway surface 41 can be further improved, and the preload applied to the wheel bearing apparatus 1 can be made a more appropriate value.
The roundness a of the outer peripheral surface 38a and the flatness B of the axial end surface 38B of the caulking portion 38 can be measured by bringing the contact into contact with the outer peripheral surface 38a and the axial end surface 38B. Further, by capturing the caulking portion 38 and processing the image captured by the caulking portion 38, the roundness a of the outer peripheral surface 38a and the flatness B of the axial end surface 38B can be measured by non-contact.
Further, by setting the roundness a of the outer peripheral surface 38a of the caulking portion 38 to a small value of 0.4 or less, the variation between the wheel bearing apparatuses 1, which is a preload applied to the wheel bearing apparatus 1, can be suppressed to be small, and the rotational torque of the wheel bearing apparatus 1 can be stabilized.
Therefore, when the wheel bearing apparatus 1 is mounted on a pair of left and right wheels of a vehicle, the steering stability of the vehicle can be improved, and for example, control and management at the time of automatic driving of the vehicle can be facilitated.
[ second embodiment of bearing device for wheel ]
The wheel bearing apparatus 1 may be configured as the wheel bearing apparatus 1A shown in fig. 3. The wheel bearing apparatus 1A is configured as a wheel bearing apparatus for a driving wheel, and is mainly different from the wheel bearing apparatus 1 in that a hub wheel 13 is provided in place of the hub wheel 3.
A small diameter stepped portion 131 having a smaller diameter than the outer disc side end portion is formed at the inner disc side end portion of the outer peripheral surface of the hub wheel 13. A wheel mounting flange 132 for mounting a wheel is integrally formed at an outer disc side end portion of the hub wheel 13.
A plurality of bolt holes 135 are formed in the wheel mounting flange 132. Hub bolts 136 for fastening the hub wheel 13 to the wheel or the brake member can be pressed into the bolt holes 135.
In the hub wheel 13, a sliding contact surface 134 for sliding contact of the outer disc side seal member 9 is formed on the base side of the wheel mounting flange 132. An inner raceway surface 133 on the outer disc side is provided on the outer peripheral surface of the hub wheel 13 so as to face the outer raceway surface 24 on the outer disc side of the outer ring 2. That is, the hub wheel 13 forms the inner raceway surface 133 on the outer disc side of the inner member.
A shaft hole 137 is formed in an inner diameter portion of the hub wheel 13 in the axial direction. The shaft hole 137 penetrates the hub wheel 13 in the axial direction, and a shaft portion of the constant velocity universal joint can be coupled to the shaft hole 137.
The inner ring 4 is provided at the small diameter stepped portion 131 of the hub wheel 13. The inner ring 4 is fixed to the small diameter stepped portion 131 of the hub wheel 13 by press-fitting and caulking. The inner ring 4 applies a preload to an inner-disk-side bead row 5 and an outer-disk-side bead row 6 as rolling rows. The inner ring 4 has an inner-disk-side end face 42 at an inner-disk-side end. A caulking portion 138 to be caulked to the inner disc side end surface 42 of the inner ring 4 is formed at the inner disc side end portion of the hub wheel 13.
In the wheel bearing apparatus 1A, the cover 15 is not fitted into the inner-disc-side opening 21 of the outer ring 2, and instead, the inner-disc-side sealing member 10 closing the inner-disc-side opening end of the annular space S is fitted into the inner-disc-side opening 21. Other structures of the wheel bearing apparatus 1A are the same as those of the wheel bearing apparatus 1, and therefore the same reference numerals are given thereto, and the description thereof will be omitted.
[ rivet portion of bearing device for wheel 1A ]
As shown in fig. 4, the caulking portion 138 of the hub wheel 13 has an outer peripheral surface 138a formed in a circular shape and an axial end surface 138b as an end surface on the inner disc side. The outer peripheral surface 138a of the caulking portion 138 is formed in a circular shape so that the roundness Aa becomes 0.4 or less (Aa. Ltoreq.0.4).
The roundness Aa of the outer peripheral surface 138a is a magnitude of deformation with respect to a circumferential circle of the outer peripheral surface 138a, and is represented by a difference in radius between two concentric circles when the outer peripheral surface 138a is sandwiched between the two concentric circles. For example, in the case where the roundness Aa is 0.4, the outer peripheral surface 138a is limited between two concentric circles whose radii differ by only 0.4.
By forming the caulking portion 138 in such a shape that the roundness Aa of the outer peripheral surface 138a is 0.4 or less in this way, it is possible to improve the roundness of the raceway surface such as the inner raceway surface 41, and to set the preload applied to the wheel bearing apparatus 1A to an appropriate value, and it is possible to improve the steering stability of the vehicle to which the wheel bearing apparatus 1A is attached and the life of the wheel bearing apparatus 1A.
Further, the roundness Aa of the outer peripheral surface 138a of the caulking portion 138 has a correlation with the starting torque of the wheel bearing apparatus 1A, and there is a relationship in which the smaller the roundness Aa is, the smaller the starting torque of the wheel bearing apparatus 1A is.
For example, as shown in table 1, in the case where the roundness Aa is equal to or less than 0.1 (Aa is equal to or less than 0.1), the magnitude of the starting torque of the wheel support bearing apparatus 1A is reduced to one 12% or less relative to the case where the roundness Aa is greater than 0.1 and equal to or less than 0.4 (0.1 < Aa is equal to or less than 0.4), as in the case of the relationship between the roundness a and the starting torque of the wheel support bearing apparatus 1. On the other hand, when the roundness Aa exceeds 0.4 (0.4 < Aa), the magnitude of the starting torque of the wheel bearing apparatus 1A becomes +12% or more with respect to the case where the roundness Aa is greater than 0.1 and 0.4 or less.
Therefore, from the viewpoint of reducing the starting torque of the wheel bearing apparatus 1A, the roundness Aa of the outer peripheral surface 138a of the caulking portion 138 is preferably 0.4 or less. Further, the roundness Aa of the outer peripheral surface 138a of the caulking portion 138 is more preferably 0.1 or less.
The caulking portion 138 is formed so that the flatness Ba of the axial end surface 138b is 0.2 or less (ba.ltoreq.0.2). The flatness Ba of the axial end surface 138b is a magnitude of deformation with respect to a circumferential plane of the axial end surface 138b, and is expressed by a magnitude of a gap between two parallel planes when the axial end surface 138b is sandwiched between the two planes.
By forming the caulking portion 138 in such a shape that the flatness Ba of the axial end surface 138b is 0.2 or less, the roundness Aa of the outer peripheral surface 138a of the caulking portion 138 can be improved, the roundness of the raceway surface such as the inner raceway surface 41 can be further improved, and the preload applied to the wheel bearing apparatus 1A can be made more appropriate.
The roundness Aa of the outer peripheral surface 138a and the flatness Ba of the axial end surface 138b of the caulking portion 138 can be measured by bringing the contact into contact with the outer peripheral surface 138a and the axial end surface 138b. Further, by capturing the caulking portion 138 and processing the image captured by the caulking portion 138, the roundness a of the outer peripheral surface 138a and the flatness B of the axial end surface 138B can be measured by non-contact.
Further, by setting the roundness Aa of the outer peripheral surface 138a of the caulking portion 138 to a small value of 0.4 or less, the variation between the wheel bearing apparatuses 1A, which is a preload applied to the wheel bearing apparatus 1A, can be suppressed to be small, and the rotational torque in the wheel bearing apparatus 1A can be stabilized.
Therefore, when the wheel bearing apparatus 1A is mounted on a pair of left and right wheels of a vehicle, the steering stability of the vehicle can be improved, and for example, control and management at the time of automatic driving of the vehicle can be facilitated.
Industrial applicability
The present utility model can be used for a wheel bearing device.

Claims (4)

1. A bearing device for a wheel, comprising:
an outer member having a double-row outer raceway surface on an inner periphery thereof;
an inner member which is configured from a hub wheel having a small-diameter stepped portion extending in an axial direction on an outer periphery thereof and at least one inner ring press-fitted into the small-diameter stepped portion of the hub wheel, and which has a double-row inner raceway surface facing the double-row outer raceway surface; and
a double row rolling element which is housed between both raceway surfaces of the outer member and the inner member so as to be freely rolling,
the hub wheel has a caulking portion caulking with the inner ring at an axial end portion,
the roundness of the outer peripheral surface of the caulking portion is 0.4 or less.
2. The wheel bearing apparatus according to claim 1, wherein,
the roundness of the outer peripheral surface of the caulking portion is 0.1 or less.
3. The wheel bearing apparatus according to claim 1, wherein,
the flatness of the axial end surface of the caulking portion is 0.2 or less.
4. A vehicle is characterized in that,
the vehicle uses the wheel bearing apparatus according to any one of claims 1 to 3 for a pair of left and right wheels.
CN202322224966.0U 2022-08-24 2023-08-17 Bearing device for wheel and vehicle Active CN220748807U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022133302A JP2024030418A (en) 2022-08-24 2022-08-24 Wheel bearing device
JP2022-133302 2022-08-24

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CN202311040373.7A Pending CN117628058A (en) 2022-08-24 2023-08-17 Bearing device for wheel

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0384218A (en) * 1989-08-29 1991-04-09 Nippon Seiko Kk Sealed rolling bearing
JP4175139B2 (en) * 2003-02-24 2008-11-05 日本精工株式会社 Manufacturing method of wheel bearing unit
JP2004257410A (en) * 2003-02-24 2004-09-16 Nsk Ltd Quality inspecting method of bearing unit for wheel
JP5116131B2 (en) * 2005-09-14 2013-01-09 Ｎｔｎ株式会社 Drive wheel bearing device
DE102018103109A1 (en) * 2018-02-13 2019-08-14 Schaeffler Technologies AG & Co. KG Wheel bearing assembly with a rotation axis

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JP2024030418A (en) 2024-03-07
WO2024043123A1 (en) 2024-02-29

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