CN219888492U - Bearing device for wheel - Google Patents

Bearing device for wheel Download PDF

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Publication number
CN219888492U
CN219888492U CN202320251263.4U CN202320251263U CN219888492U CN 219888492 U CN219888492 U CN 219888492U CN 202320251263 U CN202320251263 U CN 202320251263U CN 219888492 U CN219888492 U CN 219888492U
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CN
China
Prior art keywords
peripheral surface
hub
outer peripheral
bolt
diameter
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CN202320251263.4U
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Chinese (zh)
Inventor
�林正明
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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
    • 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
    • B60B27/001—Hubs with roller-bearings
    • 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
    • B60B35/12—Torque-transmitting axles
    • B60B35/14—Torque-transmitting axles composite or split, e.g. half- axles; Couplings between axle parts or sections
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
    • F16C19/385—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with two rows, i.e. double-row tapered roller bearings
    • 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

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

Abstract

Provided is a bearing device for a wheel, which can improve maintainability while suppressing restrictions on the design of internal specifications. The bearing device for a wheel is provided with: an outer ring; an inner member (hub wheel and inner ring) having a double-row inner rail groove and a wheel mounting flange, the double-row inner rail groove being opposed to the double-row outer rail groove provided in the outer ring; double row ball rows; and a hub bolt that is press-fitted into a bolt hole of the wheel mounting flange, the outer ring having: the hub bolt comprises a first outer peripheral surface, a second outer peripheral surface with a smaller diameter than the first outer peripheral surface, and a step surface connecting the first outer peripheral surface and the second outer peripheral surface, wherein the outer diameter radius of the first outer peripheral surface is larger than the inscribed radius of the head part of the hub bolt pressed into the bolt hole, and the outer diameter radius of the second outer peripheral surface is smaller than the inscribed radius of the head part of the hub bolt pressed into the bolt hole.

Description

Bearing device for wheel
Technical Field
The present utility model relates to a bearing device for a wheel.
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 the bearing device for a wheel, a hub wheel as an inner member has a hub flange extending radially outward, and a hub bolt for fastening the hub wheel to a wheel or the like is press-fitted into a bolt hole formed in the hub flange.
In the case of designing the internal standard of the wheel bearing apparatus, it is effective to increase the pitch diameter (p.c.d.) and the ball diameter of the balls accommodated between the two track grooves of the outer member and the inner member in order to improve durability and resistance to tracking accompanying an increase in vehicle weight. In order to prevent burn-through during induction hardening of the outer rail groove of the outer member, it is necessary to secure a constant wall thickness between the bottom of the outer rail groove and the outer peripheral surface of the outer member.
In this way, if the pitch diameter of the balls, the ball diameter, or the wall thickness of the outer member is increased, the outer diameter of the outer peripheral surface of the outer member increases, and when the hub bolts press-fitted to the hub flange are pulled out, the hub flange interferes with the outer peripheral surface of the outer member, and the hub bolts cannot be pulled out, which may reduce the maintainability of the wheel bearing apparatus.
In order to solve such a problem, patent document 1 discloses a wheel bearing device in which a guide groove for guiding a hub bolt along a rotation shaft is formed in an outer diameter portion of a thick wall portion provided at an outer disc side end portion of an outer ring as an outer member.
Prior art literature
Patent literature
Patent document 1: japanese patent No. 6725993
Disclosure of Invention
Problems to be solved by the utility model
However, as in the wheel bearing device disclosed in patent document 1, if the guide groove is formed in the outer diameter portion of the outer ring, the outer diameter dimension of the outer ring in the portion where the guide groove is formed is limited, and there is a limit to design of the inner specifications such as the pitch diameter of the balls and the ball diameter, or it is difficult to secure the wall thickness of the outer ring, and there is a possibility that the wheel bearing device having sufficient durability cannot be designed. Such a problem is remarkable in a bearing device for a wheel in which a hub bolt is disposed on the inner diameter side in order to achieve compactness.
The present utility model has been made in view of the above-described circumstances, and an object thereof is to provide a bearing device for a wheel capable of improving maintainability while suppressing restrictions on the design of internal specifications.
Means for solving the problems
Specifically, the wheel bearing device includes: an outer member having a double-row outer rail groove on an inner periphery thereof; an inner member having a double-row inner rail groove facing the double-row outer rail groove and a hub flange extending radially outward at one axial end; a double row rolling element which is accommodated between the two rail grooves of the outer member and the inner member so as to be capable of rolling; and a hub bolt pressed into a bolt hole formed in the hub flange, wherein the outer member has: a first outer peripheral surface located on an outer diameter side of a bottom portion in the outer rail groove on one axial end side; a second outer peripheral surface that is located closer to the hub flange side than the first outer peripheral surface in an axial direction and has a smaller diameter than the first outer peripheral surface; and a step surface that is located between the first outer peripheral surface and the second outer peripheral surface in the axial direction and connects the first outer peripheral surface and the second outer peripheral surface, wherein the first outer peripheral surface has an outer diameter radius larger than an inscribed circle radius of a head portion of the hub bolt that is press-fitted into the bolt hole, and the second outer peripheral surface has an outer diameter radius smaller than an inscribed circle radius of the head portion of the hub bolt that is press-fitted into the bolt hole.
Effects of the utility model
According to the present utility model, it is possible to improve maintainability of the wheel bearing device while suppressing restrictions on the design of the internal specification of the wheel bearing device.
Drawings
Fig. 1 is a side sectional view showing a bearing device for a wheel.
Fig. 2 is a side view showing the hub bolts.
Fig. 3 is a side cross-sectional view of the bearing device for a wheel showing a state in which the head of the hub bolt press-fitted into the bolt hole is radially separated from the second outer peripheral surface of the outer ring.
Fig. 4 is a side sectional view showing a stepped surface formed by a curved surface recessed toward the outer diameter side.
Fig. 5 is a side sectional view showing a stepped surface formed by a curved surface protruding toward the outer diameter side.
Fig. 6 is a side cross-sectional view of the wheel bearing apparatus showing a state in which the head of the hub bolt pulled out from the bolt hole in the axial direction is in contact with the contact portion of the stepped surface.
Fig. 7 is a side sectional view showing an inclined surface of the bolt hole.
Fig. 8 is a diagram showing a sequence when the hub bolts are pulled out from the bolt holes.
Fig. 9 is a side cross-sectional view of the wheel bearing apparatus showing a state in which the hub bolts are moved in parallel to the outer diameter side in the parallel movement step.
Fig. 10 is a side cross-sectional view showing the bearing device for a wheel in a state of being pulled out further toward the inner disc side in the axial direction before the head portion comes into contact with the step surface in the additional pulling-out step.
Fig. 11 is a side cross-sectional view showing the wheel bearing apparatus in a state in which the hub bolts are inclined to the side of the outer diameter side of the shaft portion with respect to the axial direction in the tilting step.
Fig. 12 is a side cross-sectional view showing the wheel bearing apparatus in a state of being pulled out from the bolt hole in a direction of inclining the hub bolt in the complete pulling-out process.
Fig. 13 is a diagram showing a procedure when the hub bolts are pressed into the bolt holes.
Reference numerals illustrate:
1. bearing device for wheel
2. Outer ring
3. Hub wheel
4. Inner ring
5. Inner disc side ball row
6. Outer disk side rolling ball row
23 Outer rail groove (of inner disk side)
24 Outside track groove (of outer disc side)
24a bottom
27. A first outer peripheral surface
28. A second peripheral surface
29. Step surface
32. Wheel mounting flange
33 Inner track groove (of outer disc side)
35. Bolt hole
36. Hub bolt
41 Inner track groove (of inner disc side)
291. Contact portion
321. Inner disk side end face
351. Inclined surface
361. Head part
361a contacted part
362. Raised part
362a outer disk side end
363. Shaft portion
D1 Outer diameter (of head)
D2 Outer diameter (of the ridge)
D3 External diameter (of shaft)
L1 (from the contacted portion of the head to the outer disk side end portion of the bulge portion)
L2 dimension (from inner disk side end face of wheel mounting flange to contact portion)
R0 (when the hub bolts are pressed into the bolt holes) inscribed circle radius
R2 (of the first peripheral surface) outside diameter radius
R3 (of second peripheral surface) outside diameter radius
R4 (when the shaft portion of the hub bolt contacts the inner peripheral surface of the outer diameter side of the bolt hole)
S01 procedure for extracting raised portion
S04 tilting procedure
S05 complete extraction procedure
S11 insertion step
S12 Axis procedure
S14 press-in step
θ inclination angle.
Detailed Description
Hereinafter, embodiments 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 configured to rotatably support a wheel in a suspension apparatus of a vehicle such as an automobile.
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, a double row inner disc side bead row 5 and an outer disc side bead row 6 as rolling rows, an outer disc side seal member 9, and an inner disc side seal member 10.
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 the wheel side of the wheel bearing device 1 when mounted on the vehicle body at one axial end side, and the inner disc side represents the vehicle body side of the wheel bearing device 1 when mounted on the vehicle body at the other axial end side.
An inner-disc-side opening 21 into which the inner-disc-side seal member 10 can be fitted is formed at an inner-disc-side end portion of the outer ring 2. An outer-disc-side opening 22 into which the outer-disc-side seal member 9 can be fitted is formed at an outer-disc-side end portion of the outer ring 2.
By fitting the inner-disc-side sealing member 10 into the inner-disc-side opening 21, the inner-disc-side opening end of the annular space S formed by the outer ring 2 as the outer member and the hub wheel 3 and the inner ring 4 as the inner member is closed. By fitting the outer-disk-side sealing member 9 into the outer-disk-side opening 22, the outer-disk-side opening end of the annular space S is closed.
The inner-disk-side seal member 10 and the outer-disk-side seal member 9 are seal devices for sealing off the open ends of the annular space S. In this way, the inner disc side seal member 10 and the outer disc side seal member 9 close the inner disc side and the outer disc side open ends of the annular space S, thereby suppressing intrusion of foreign matter such as muddy water into the interior of the wheel bearing apparatus 1.
An outer raceway groove 23 on the inner disk side and an outer raceway groove 24 on the outer disk side are formed in 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 vehicle body mounting flange 25 is provided with bolt holes 26 into which fastening members (bolts in this case) for fastening the vehicle body side member to the outer ring 2 are inserted.
A small diameter step 31 having a smaller diameter than the outer disc side end is formed at the inner disc side end in 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. The wheel mounting flange 32 is an example of a hub flange. 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, with which the outer disc side seal member 9 is in sliding contact, is formed on the base side of the wheel mounting flange 32. On the outer peripheral surface of the hub wheel 3, an inner raceway groove 33 on the outer disc side is provided so as to face the outer raceway groove 24 on the outer disc side of the outer ring 2. That is, the hub wheel 3 forms the inner rail groove 33 on the outer disk side of the inner member.
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 step 31 of the hub wheel 3 by press fitting. An inner raceway groove 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 groove 23 on the inner disk side of the outer ring 2. That is, the inner rail groove 41 is formed by the inner ring 4 on the inner disk 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 held by a cage 8. The inner-disk-side bead row 5 is rollably sandwiched between the inner rail groove 41 of the inner ring 4 and the outer rail groove 23 of the inner disk side of the outer ring 2. The outer-disk-side bead row 6 is interposed between the inner rail groove 33 of the hub wheel 3 and the outer rail groove 24 of the outer disk 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 accommodated between the two track grooves of the outer member and the inner member so as to be freely rotatable.
In the wheel bearing apparatus 1, the 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 the double row angular contact ball bearing.
[ hub bolt ]
As shown in fig. 2, the hub bolt 36 includes a head portion 361, a boss portion 362, a shaft portion 363, and a male screw portion 364. The head 361 is located at the inner disk side end of the hub bolt 36 in a state where the hub bolt 36 is pressed into the bolt hole 35. The head 361 is located on the inner disc side of the wheel mounting flange 32. The head 361 has an outer diameter D1.
The boss 362 is a portion pressed into the bolt hole 35 in the hub bolt 36, and a plurality of axially extending bosses are formed on the boss 362 in the circumferential direction. The ridge 362 is located adjacent to the outer disk side of the head 361, and has an outer diameter D2 smaller than the outer diameter D1 of the head 361.
The shaft portion 363 is located adjacent to the outer disk side of the ridge portion 362 and has an outer diameter D3 smaller than the outer diameter D2 of the ridge portion 362. The male screw portion 364 is located adjacent to the outer disk side of the shaft portion 363, and has an outer diameter D4 substantially the same as the outer diameter D3 of the shaft portion 363. The hub wheel 3 can be fastened to the wheel or the brake member by screwing the mounting nut to the male screw portion 364 of the hub bolt 36 press-fitted into the bolt hole 35.
As shown in fig. 3, the hub bolts 36 can be press-fitted into the bolt holes 35 from the inner disc side of the wheel mounting flange 32, and the head 361 of the hub bolts 36 press-fitted into the bolt holes 35 is in contact with the inner disc side end surface 321 of the wheel mounting flange 32. The inner disc side end surface 321 is an example of the other end surface of the hub flange in the axial direction.
The inscribed circle radius of the head 361 pressed into the hub bolt 36 of the bolt hole 35 is R0. The inscribed circle radius R0 is a length in the radial direction between the portion closest to the rotation axis X and the rotation axis X in the head 361. That is, the inscribed circle radius R0 is a circle centered on the rotation axis X, and is a radius of a circle that contacts a portion of the head 361 closest to the rotation axis X.
[ outer race ]
As shown in fig. 3, the outer rail groove 24 on the outer disk side of the outer ring 2 has a bottom 24a. The bottom 24a is a portion of the outer race groove 24 having the largest dimension from the inner diameter radius of the rotation axis X of the wheel bearing apparatus 1. The dimension of the inner diameter radius of the bottom 24a from the rotation axis X is the inner diameter radius dimension R1. The inner diameter radius R1 is determined by the internal specifications of the wheel bearing apparatus 1, such as the pitch diameter (p.c.d.) and the diameter of the ball 7.
The outer ring 2 has a first outer peripheral surface 27, a second outer peripheral surface 28, and a stepped surface 29. The first outer peripheral surface 27 is located on the outer diameter side of the bottom 24a in the outer-disc-side outer-side raceway groove 24.
The wall thickness dimension between the bottom 24a in the radial direction of the outer race 2 and the first outer peripheral surface 27 is d. The wall thickness dimension d is determined in consideration of, for example, a dimension required to prevent burn-through in the induction hardening of the outer rail groove 24. The outer diameter of the first outer peripheral surface 27 from the rotation axis X is set to an outer diameter R2. The outer diameter radius R2 is set to a value obtained by adding the wall thickness d of the outer ring 2 to at least the inner diameter radius R1 of the bottom 24a.
The second outer peripheral surface 28 is located at an outer-disc-side end portion of the outer ring 2, which is located closer to the wheel mounting flange 32 side than the first outer peripheral surface 27 in the axial direction. The outer diameter of the second outer peripheral surface 28 from the rotation axis X is set to an outer diameter R3. The outer diameter radius R3 is smaller than the outer diameter radius R2 of the first outer peripheral surface 27.
The step surface 29 is located between the first outer peripheral surface 27 and the second outer peripheral surface 28 in the axial direction, and connects the first outer peripheral surface 27 and the second outer peripheral surface 28. The inner-disk-side end of the stepped surface 29 is connected to the first outer peripheral surface 27, and the outer-disk-side end of the stepped surface 29 is connected to the second outer peripheral surface 28.
The stepped surface 29 is formed of a tapered surface that linearly expands in diameter from the outer disk side end to the inner disk side end. The step surface 29 may be formed of a curved surface that expands in diameter from the outer disk side end portion toward the inner disk side end portion and is recessed toward the outer diameter side, as in the step surface 29A shown in fig. 4. The step surface 29 may be formed of a curved surface that expands in diameter from the outer disk side end portion toward the inner disk side end portion and protrudes toward the outer diameter side as shown in the step surface 29B in fig. 5.
In this way, the stepped surface 29 can be formed by a tapered surface, a curved surface recessed toward the outer diameter side, or a curved surface protruding toward the outer diameter side, whereby the degree of freedom in designing the outer shape of the outer ring 2 can be improved.
The first outer peripheral surface 27, the second outer peripheral surface 28, and the step surface 29 can be formed by forging. Further, after the outer ring 2 is formed by forging, the first outer peripheral surface 27, the second outer peripheral surface 28, and the stepped surface 29 can also be formed by turning the outer peripheral surface of the outer ring 2. That is, the first outer peripheral surface 27, the second outer peripheral surface 28, and the step surface 29 can be formed to have a forged surface or a turned surface.
In the case where the first outer peripheral surface 27, the second outer peripheral surface 28, and the step surface 29 are formed to have the specifications of the forging surface at the time of forging, it is not necessary to perform turning work on the first outer peripheral surface 27, the second outer peripheral surface 28, and the step surface 29, and it is possible to simplify the manufacturing process of the bearing device for a wheel 1. On the other hand, when the first outer peripheral surface 27, the second outer peripheral surface 28, and the step surface 29 are formed by turning, so that the first outer peripheral surface 27, the second outer peripheral surface 28, and the step surface 29 have the specifications of the turned surfaces, the outer diameter shape and the outer diameter radius dimension of the first outer peripheral surface 27, the second outer peripheral surface 28, and the step surface 29 can be precisely finished.
The outer diameter radius R2 of the first outer peripheral surface 27 is set to be larger than the inscribed radius R0 of the head 361 of the hub bolt 36 press-fitted into the bolt hole 35 (R2 > R0), and the outer diameter radius R3 of the second outer peripheral surface 28 is set to be smaller than the inscribed radius R0 of the head 361 of the hub bolt 36 press-fitted into the bolt hole 35 (R3 < R0).
The head portion 361 of the hub bolt 36 press-fitted into the bolt hole 35 and the second outer peripheral surface 28 of the outer ring 2 are located at positions overlapping in the axial direction, but since the outer diameter radius dimension R3 of the second outer peripheral surface 28 is formed smaller than the inscribed radius R0 of the head portion 361, the head portion 361 of the hub bolt 36 press-fitted into the bolt hole 35 is separated from the second outer peripheral surface 28 of the outer ring 2 in the radial direction and does not interfere.
On the other hand, as shown in fig. 6, the outer diameter radius R2 of the first outer peripheral surface 27 is formed larger than the inscribed radius R0 of the head portion 361 of the hub bolt 36 press-fitted into the bolt hole 35, so that when the hub bolt 36 press-fitted into the bolt hole 35 is pulled out toward the outer disk side in the axial direction, the head portion 361 of the hub bolt 36 comes into contact with the contact portion 291 of the stepped surface 29. The contact portion 291 is a portion that contacts the head 361 of the hub bolt 36 when the hub bolt 36 press-fitted into the bolt hole 35 is axially pulled out of the bolt hole 35.
As shown in fig. 3 and 6, the head portion 361 of the hub bolt 36 has a portion to be contacted 361a, and the portion to be contacted 361a is brought into contact with the contact portion 291 of the stepped surface 29 when the hub bolt 36 press-fitted into the bolt hole 35 is pulled out from the bolt hole 35 toward the inner disk side in the axial direction. In the hub bolt 36, the dimension from the contacted portion 361a of the head portion 361 in the axial direction to the outer disc side end portion 362a of the boss portion 362 is L1.
As shown in fig. 6, in the wheel bearing apparatus 1, the dimension from the inner disc side end surface 321 of the wheel mounting flange 32 in the axial direction to the contact portion 291 is L2. The dimension L2 is formed larger than the dimension L1 of the hub bolt 36 (L2 > L1).
As shown in fig. 7, the bolt hole 35 of the wheel mounting flange 32 has an inclined surface 351 that expands in diameter toward the inner disc side at the inner disc side end. The inclination angle θ of the inclined surface 351 with respect to the axial direction is set to 45 ° or more.
The outer peripheral surface of the outer ring 2 including the first outer peripheral surface 27, the second outer peripheral surface 28, and the step surface 29 has no concave-convex shape in the circumferential direction as in the case where a guide groove for guiding the hub bolt 36 in the axial direction is formed on the outer peripheral surface of the outer ring 2.
If the outer peripheral surface of the outer ring 2 is provided with the guide groove for guiding the hub bolt 36, the outer shape of the outer peripheral surface in the circumferential direction becomes complicated, and therefore, the life of the forging die of the outer ring 2 formed by the forging process may be reduced. However, since the outer ring 2 has no guide groove for guiding the hub bolts 36 on the outer peripheral surface, the outer shape of the outer peripheral surface in the circumferential direction is not complicated, and therefore, a reduction in the life of the forging die can be suppressed.
[ method of setting bearing device for wheel ]
Next, a method of installing the wheel bearing apparatus 1 when the wheel bearing apparatus 1 is installed by inserting and removing the hub bolts 36 into and from the bolt holes 35 of the wheel mounting flange 32 will be described. Specifically, the procedure when the hub bolts 36 press-fit into the bolt holes 35 are pulled out from the bolt holes 35 and the procedure when the hub bolts 36 are press-fit into the bolt holes 35 will be described.
(sequence of extracting the hub bolt from the bolt hole)
As shown in fig. 3, in a state where the hub bolts 36 are pressed into the bolt holes 35 of the wheel mounting flange 32, the head 361 of the hub bolt 36 contacts the inner disc side end surface 321 of the wheel mounting flange 32. The head portion 361 of the hub bolt 36 pressed into the bolt hole 35 and the second outer peripheral surface 28 of the outer ring 2 are located at positions overlapping in the axial direction, and the stepped surface 29 and the first outer peripheral surface 27 of the outer ring 2 are located on the inner disk side of the head portion 361.
When the hub bolts 36 press-fitted into the bolt holes 35 in this manner are pulled out of the bolt holes 35, as shown in fig. 8, a boss pulling-out step S01 is first performed.
As shown in fig. 6, in the bulge extracting step S01, the hub bolts 36 press-fitted into the bolt holes 35 are extracted toward the inner disk side in the axial direction until the contacted portion 361a of the head portion 361 contacts the contact portion 291 of the stepped surface 29. In this case, since the dimension L2 from the inner disc side end surface 321 to the contact portion 291 of the wheel mounting flange 32 is larger than the dimension L1 from the contacted portion 361a of the head 361 to the outer disc side end portion 362a of the boss portion 362, the boss portion 362 of the hub bolt 36 is in a state of being completely pulled out from the bolt hole 35.
After the boss extracting step S01, the shaft portion 363 of the hub bolt 36 is positioned in the bolt hole 35. Since the shaft portion 363 has an outer diameter D3 smaller than the outer diameter D2 of the boss portion 362, a gap exists between the outer peripheral surface of the shaft portion 363 and the inner peripheral surface of the bolt hole 35.
After the bulge extracting step S01, a parallel moving step S02 is performed. As shown in fig. 9, in the parallel moving step S02, the hub bolts 36 are moved in parallel to the outer diameter side until the outer peripheral surface of the shaft portion 363 contacts the inner peripheral surface of the bolt hole 35. By moving the hub bolt 36 in parallel to the outer diameter side, a gap is generated between the head portion 361 and the contact portion 291 of the stepped surface 29, and the hub bolt 36 can be further moved to the inner disk side.
Even when the shaft portion 363 of the hub bolt 36 is brought into contact with the inner peripheral surface on the outer diameter side of the bolt hole 35 and the hub bolt 36 is positioned on the outermost diameter side within the bolt hole 35, the outer diameter radius R2 of the first outer peripheral surface 27 is larger than the inscribed radius R4 of the head portion 361 of the hub bolt 36.
After the parallel moving step S02, an additional pulling-out step S03 is performed. As shown in fig. 10, in the additional extracting step S03, the hub bolts 36 that were moved in parallel to the outer diameter side in the parallel moving step S02 are extracted further toward the inner disc side in the axial direction until the head 361 comes into contact with the stepped surface 29. In this case, the head 361 contacts the first outer peripheral surface 27 side end of the stepped surface 29.
That is, the hub bolts 36 can be further pulled out to the inner disc side from the position after the boss pulling-out step S01 is performed by positioning the hub bolts 36 on the outermost diameter side in the bolt holes 35, but since the outer diameter radius R2 of the first outer peripheral surface 27 is larger than the inscribed radius R4 of the head 361 in the hub bolts 36 on the outermost diameter side in the bolt holes 35, the head 361 comes into contact with the stepped surface 29.
In this way, in the additional extraction step S03, the raised portion 362 extracted from the bolt hole 35 can be moved to a position further separated from the bolt hole 35 toward the inner disc side.
After the additional pulling-out step S03, a tilting step S04 is performed. As shown in fig. 11, in the tilting step S04, the hub bolt 36 is tilted toward the outer diameter side of the shaft portion 363 with respect to the axial direction toward the head portion 361.
In this case, the hub bolt 36 is inclined until, for example, the shaft portion 363 contacts a portion on the outer diameter side of the inner disc side end in the inner peripheral surface of the bolt hole 35, and the male screw portion 364 contacts a portion on the inner diameter side of the outer disc side end in the inner peripheral surface of the bolt hole 35. By tilting the hub bolts 36 in this way, the head 361 of the hub bolt 36 is separated from the outer circumferential surface of the outer ring 2 toward the outer diameter side.
After the tilting step S04, a complete extraction step S05 is performed. As shown in fig. 12, in the complete extraction step S05, the hub bolts 36 are extracted from the bolt holes 35 in the direction inclined in the inclination step S04. In this case, the hub bolts 36 are pulled out until the male screw portions 364 are completely pulled out from the bolt holes 35.
In this way, by extracting the hub bolts 36 from the bolt holes 35 in a state in which the head portion 361 is inclined to the outer diameter side of the shaft portion 363 with respect to the axial direction, the hub bolts 36 can be extracted in a state in which the head portion 361 is separated from the outer circumferential surface of the outer ring 2 to the outer diameter side. Therefore, even if the outer diameter radius R2 of the first outer peripheral surface 27 in the outer ring 2 is formed larger than the inscribed radius R0 of the head 361 of the hub bolt 36, the hub bolt 36 can be completely pulled out from the bolt hole 35.
In the wheel bearing apparatus 1, even when the pitch diameter of the balls, the internal dimensions of the ball diameters, or the wall thickness of the outer ring 2 at the position corresponding to the outer raceway groove 24 on the outer disc side is designed to be large and the outer diameter radius R2 of the first outer peripheral surface 27 is made larger than the inscribed radius R0 of the head 361, the hub bolts 36 can be completely pulled out from the bolt holes 35 by forming the second outer peripheral surface 28 having a smaller diameter than the first outer peripheral surface 27 and the step surface 29 connecting the first outer peripheral surface 27 and the second outer peripheral surface 28. This can suppress restrictions on the design of the internal specifications of the wheel bearing apparatus 1, and can improve the maintainability of the wheel bearing apparatus 1.
In particular, in the wheel bearing apparatus 1, since the dimension L2 from the inner disc side end surface 321 of the wheel mounting flange 32 to the contact portion 291 is larger than the dimension L1 from the contacted portion 361a of the head portion 361 to the outer disc side end portion 362a of the boss portion 362, the boss portion 362 can be completely pulled out of the bolt hole 35 when the hub bolt 36 is pulled out until the head portion 361 contacts the contact portion 291. Accordingly, after the boss 362 is pulled out of the bolt hole 35, the hub bolt 36 can be easily tilted with respect to the axial direction, and the hub bolt 36 can be easily pulled out.
In addition, when the hub bolts 36 are inclined until the shaft portions 363 come into contact with portions on the outer diameter side of the inner disc side ends in the inner peripheral surfaces of the bolt holes 35, the shaft portions 363 come into contact with the inclined surfaces 351 formed in the inner disc side ends of the bolt holes 35.
In this case, since the inclination angle θ of the inclined surface 351 with respect to the axial direction is set to a large angle of 45 ° or more, the hub bolts 36 can be inclined to a large extent with respect to the axial direction, and the separation dimension of the head 361 from the outer circumferential surface of the outer ring 2 can be increased. Accordingly, when the hub bolts 36 are pulled out in the oblique direction, interference between the head portion 361 and the outer circumferential surface of the outer ring 2 can be suppressed, and the hub bolts 36 can be easily pulled out completely from the bolt holes 35.
In addition, although the stepped surface 29 in the present embodiment is formed of a tapered surface that linearly expands in diameter, the stepped surface 29 may be formed of a curved surface that is recessed toward the outer diameter side, so that the hub bolt 36 is pulled out further toward the inner disc side when the head 361 comes into contact with the contact portion 291 of the stepped surface 29 in the boss pulling-out step S01. This makes it possible to easily tilt the hub bolts 36 with respect to the axial direction, and to easily perform the operation of extracting the hub bolts 36.
When the dimension L2 from the inner disc side end surface 321 of the wheel mounting flange 32 to the contact portion 291 is significantly larger than the dimension L1 from the contacted portion 361a of the head 361 to the outer disc side end portion 362a of the boss portion 362, the boss bolt 36 can be pulled out further toward the inner disc side in the boss portion pulling-out step S01. Accordingly, since the hub bolts 36 can be easily tilted with respect to the axial direction, the tilting step S04 can be performed after the bulge extracting step S01 without going through the parallel moving step S02 and the additional extracting step S03.
(sequence of pressing the hub bolt into the bolt hole)
As shown in fig. 13, when the hub bolts 36 are pressed into the bolt holes 35 of the wheel mounting flange 32, an insertion step S11 is first performed.
As shown in fig. 12, in the insertion step S11, the hub bolts 36 are inserted from the inner disc side into the bolt holes 35 in a posture inclined toward the outer diameter side of the shaft portion 363 with respect to the axial direction toward the head portion 361. As shown in fig. 11, in the insertion step S11, the hub bolts 36 are inserted into the positions where the shaft portions 363 enter the bolt holes 35.
After the insertion step S11, an axial step S12 is performed. As shown in fig. 10, in the axial direction step S12, the hub bolts 36 in an inclined posture with respect to the axial direction are moved so as to be in an axial direction posture. In this case, for example, the hub bolts 36 are moved to a position where the outer diameter side of the outer peripheral surface of the shaft portion 363 contacts the outer diameter side of the inner peripheral surface of the bolt hole 35. Thereafter, as shown in fig. 9, the hub bolts 36 are moved axially toward the outer disc side until the outer disc side end portions 362a of the bulging portions 362 come close to the inner disc side end surfaces 321 of the wheel mounting flanges 32.
After the axial direction step S12, a parallel movement step S13 is performed. As shown in fig. 6, in the parallel moving step S13, the hub bolts 36 are moved in parallel to the inner diameter side to a position where the axial centers of the hub bolts 36 coincide with the center of the bolt hole 35. By moving the hub bolts 36 in parallel to the inner diameter side, the outer peripheral surface of the shaft portion 363 is separated from the inner peripheral surface of the bolt hole 35.
After the parallel moving step S13, a press-in step S14 is performed. As shown in fig. 3, in the press-fitting step S14, the boss portion 362 of the hub bolt 36 is press-fitted into the bolt hole 35. Thus, the hub bolts 36 are pressed into the bolt holes 35.
In this way, after the hub bolt 36 is inserted into the bolt hole 35 in a state of being inclined to the outer diameter side of the shaft portion 363 with respect to the axial direction toward the head portion 361, the hub bolt 36 is moved in an axial direction posture and is press-fitted into the bolt hole 35, whereby even if the outer diameter radius R2 of the first outer peripheral surface 27 in the outer ring 2 is formed to be larger than the inscribed circle radius R0 of the head portion 361 of the hub bolt 36, the hub bolt 36 can be press-fitted into the bolt hole 35.
For example, when the dimension L2 of the wheel bearing apparatus 1 is significantly larger than the dimension L1 of the hub bolt 36, and the hub bolt 36 in a posture inclined with respect to the axial direction is moved in the axial direction step S12, the hub bolt 36 is directly moved to a position where the axial center of the hub bolt 36 coincides with the center of the bolt hole 35, whereby the parallel movement step S13 can be omitted and the process can be shifted to the press-fitting step S14.
The embodiments of the present utility model have been described above, but the present utility model is not limited to the embodiments described above, but is merely illustrative, and the present utility model can be implemented in various forms within a scope not departing from the gist of the present utility model, and it is needless to say that the scope of the present utility model is shown by the contents described in the claims and includes the meaning equivalent to the meaning described in the claims and all modifications within the scope.
Industrial applicability
The present utility model can be used for a wheel bearing device.

Claims (6)

1. A bearing device for a wheel, comprising:
an outer member having a double-row outer rail groove on an inner periphery thereof;
an inner member having a double-row inner rail groove facing the double-row outer rail groove and a hub flange extending radially outward at one axial end;
a double row rolling element which is accommodated between the two rail grooves of the outer member and the inner member so as to be capable of rolling; and
hub bolts which are pressed into bolt holes formed in the hub flange,
it is characterized in that the method comprises the steps of,
the outer member has:
a first outer peripheral surface located on an outer diameter side of a bottom portion in the outer rail groove on one axial end side;
a second outer peripheral surface that is located closer to the hub flange side than the first outer peripheral surface in an axial direction and has a smaller diameter than the first outer peripheral surface; and
a step surface which is located between the first outer peripheral surface and the second outer peripheral surface in the axial direction and connects the first outer peripheral surface and the second outer peripheral surface,
the first outer peripheral surface has an outer diameter radius larger than an inscribed radius of a head portion of the hub bolt pressed into the bolt hole,
the second outer peripheral surface has an outer diameter radius smaller than an inscribed circle radius of the head portion of the hub bolt pressed into the bolt hole.
2. The wheel bearing apparatus according to claim 1, wherein,
the hub bolt has the head portion, a boss portion located at one axial end side of the head portion and pressed into a bolt hole of the hub flange, and a shaft portion located at one axial end side of the boss portion,
the ridge portion is formed to be smaller in diameter than the head portion, the shaft portion is formed to be smaller in diameter than the ridge portion,
the step surface of the outer member has a contact portion for the head portion of the hub bolt to contact when the hub bolt is pulled out of the bolt hole in the axial direction,
the head portion of the hub bolt has a contacted portion that contacts the contact portion of the step surface when the hub bolt is pulled out of the bolt hole in the axial direction,
the dimension from the other end face in the axial direction of the hub flange to the contact portion is larger than the dimension from the contacted portion of the head portion in the hub bolt to the one end in the axial direction of the bulging portion.
3. The bearing device for a wheel according to claim 1 or 2, wherein,
the bolt hole of the hub flange has an inclined surface at the other end in the axial direction that expands in diameter toward the other end in the axial direction,
the inclination angle of the inclined surface with respect to the axial direction is 45 DEG or more.
4. The bearing device for a wheel according to claim 1 or 2, wherein,
the step surface is formed of a tapered surface that expands in diameter from one end portion to the other end portion in the axial direction, or a curved surface that expands in diameter from one end portion to the other end portion in the axial direction and protrudes or recedes toward the outer diameter side.
5. The wheel bearing apparatus according to claim 2, wherein,
when the shaft portion of the hub bolt is brought into contact with an inner peripheral surface on an outer diameter side of the bolt hole and the hub bolt is positioned on an outermost diameter side in the bolt hole, an outer diameter radius of the first outer peripheral surface is larger than an inscribed circle radius of the head portion of the hub bolt.
6. The bearing device for a wheel according to claim 1 or 2, wherein,
the step surface has a forged surface or a turned surface.
CN202320251263.4U 2022-03-11 2023-02-07 Bearing device for wheel Active CN219888492U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-038168 2022-03-11
JP2022038168A JP2023132690A (en) 2022-03-11 2022-03-11 Bearing device for wheel

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CN202310100400.9A Pending CN116733842A (en) 2022-03-11 2023-02-07 Bearing device for wheel and method for installing 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
JP3634897B2 (en) * 1995-07-19 2005-03-30 トヨタ自動車株式会社 Bolt fitting structure
JP4013675B2 (en) * 2002-07-16 2007-11-28 株式会社ジェイテクト Rolling bearing device
JP2014189192A (en) * 2013-03-27 2014-10-06 Ntn Corp Bearing device for wheel
JP2017065296A (en) * 2015-09-28 2017-04-06 Ntn株式会社 Bearing device for wheel
JP7056080B2 (en) * 2017-11-01 2022-04-19 日本精工株式会社 Hub unit bearing

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JP2023132690A (en) 2023-09-22
WO2023171317A1 (en) 2023-09-14

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