KR20170043045A - Wheel bearing and manufacturing method of the same - Google Patents

Wheel bearing and manufacturing method of the same Download PDF

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Publication number
KR20170043045A
KR20170043045A KR1020150142408A KR20150142408A KR20170043045A KR 20170043045 A KR20170043045 A KR 20170043045A KR 1020150142408 A KR1020150142408 A KR 1020150142408A KR 20150142408 A KR20150142408 A KR 20150142408A KR 20170043045 A KR20170043045 A KR 20170043045A
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KR
South Korea
Prior art keywords
hub
flange
spacer
spline
inner ring
Prior art date
Application number
KR1020150142408A
Other languages
Korean (ko)
Other versions
KR101779788B1 (en
Inventor
송재명
김완태
박종현
Original Assignee
주식회사 일진글로벌
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Priority to KR1020150142408A priority Critical patent/KR101779788B1/en
Publication of KR20170043045A publication Critical patent/KR20170043045A/en
Application granted granted Critical
Publication of KR101779788B1 publication Critical patent/KR101779788B1/en

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    • 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
    • B60B27/0015—Hubs for driven wheels
    • B60B27/0036—Hubs for driven wheels comprising homokinetic joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0073—Hubs characterised by sealing means
    • 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
    • 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
    • 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
    • F16C19/183—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 with two rows at opposite angles
    • F16C19/184—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 with two rows at opposite angles in O-arrangement
    • F16C19/186—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 with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2380/00—Bearings
    • B60B2380/10—Type
    • B60B2380/12—Ball 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

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

Abstract

The present invention provides a wheel bearing, comprising: a hub; an inner ring which is combined with the hub; an outer ring which is distanced from the hub and the inner ring and which wraps around the hub; a flange which is spline-combined with the hub and which is made of materials with a lower specific gravity than the hub; and a spacer which is placed on one side of the flange to support a load which is generated during orbital-forming the hub. By manufacturing a flange with different materials from those of the hub and mounting it on the hub, the present invention can reduce the weight of the whole wheel bearing and the manufacturing costs. Accordingly, the present invention can improve fuel efficiency of a vehicle. In addition, by mounting the spacer on one side of the flange, the present invention can prevent the deformation of the flange even if one end unit of the hub is processed.

Description

[0001] WHEEL BEARING AND MANUFACTURING METHOD OF THE SAME [0002]

The present invention relates to a wheel bearing and a manufacturing method thereof, and more particularly, to a wheel bearing capable of improving durability of a wheel bearing and reducing weight, and a manufacturing method thereof.

In general, a bearing is a device that is mounted between a rotating element and a non-rotating element in a vehicle body to facilitate rotation of the rotating element. The wheel bearings of the vehicle are rotatably connected to the vehicle body so that the vehicle can move.

These wheel bearings are divided into drive wheel bearings that transmit the power generated by the engine and follower wheel bearings that do not transmit the drive force.

The driving wheel wheel bearing includes a rotating element and a non-rotating element. The rotary element is adapted to rotate together with the drive shaft by the torque generated by the engine and passed through the transmission. The non-rotating element is fixed to the vehicle body, and a rolling element is interposed between the rotating element and the non-rotating element.

The follower wheel bearings are similar to drive wheel bearings in that the rotational elements are not connected to the drive shaft.

A conventional wheel bearing comprises a hub which receives a driving force through a spindle of a constant velocity joint and transmits the driving force to the wheel, an inner ring provided on the outer peripheral surface of the hub, an outer ring surrounding the hub and the inner ring, And includes a plurality of rolling elements.

However, since the hub occupies a considerable volume in the wheel bearings and the material thereof is made of steel (carbon steel, for example, S55CR), there is a problem in that the overall weight of the wheel bearing is considerably increased. . Accordingly, various researches for replacing a part of the wheel bearing for weight reduction with a lightweight material have been continued.

If a part of the wheel bearing is replaced with a lightweight material, there is a problem that a part of the wheel bearing made of a lightweight material deforms when the wheel bearing is machined.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a wheel hub, in which a flange of a lightweight material is separately mounted and a spacer is mounted on one side thereof, And to provide a wheel bearing capable of preventing the flange from being deformed when machining the wheel bearing.

In order to achieve the above object, a wheel bearing according to an embodiment of the present invention may include a hub, an inner ring coupled to the hub, and an outer ring spaced from the hub and the inner ring and surrounding the hub.

Also, the wheel bearing is splined to the hub and formed of a material having a specific gravity relatively smaller than that of the hub; And a spacer provided on one side of the flange to support a load generated when the hub is orbital-formed.

The spacer may be provided with a lip portion for sealing a space between the flange and the hub.

The spacer comprising a direction extension extending radially in contact with one surface of the flange; And an axial extension extending from the radially inner end of the radial extension to the other axial end and disposed between an outer circumferential surface of the hub and an inner circumferential surface of the flange.

And the lip portion may be formed to surround at least a part of the axially extending portion.

The hub includes a forming part bent radially outward at one end thereof; And a stepped portion having a stepped portion radially outwardly spaced from the forming portion by a predetermined distance in the axial direction, wherein the flange and the inner ring are fixed in the axial direction between the forming portion and the stepped portion .

And the spacer is disposed between the forming portion and the flange.

The hub includes a spacer mounting portion on which the spacer is mounted; And a flange mounting portion on which the flange is mounted on the other side of the spacer mounting portion, wherein a hub spline is formed on an outer circumferential surface of the flange mounting portion, the hub spline having teeth and a tooth groove alternately arranged along the circumferential direction, And is splined to a flange spline formed on the inner circumferential surface of the flange.

A spacer space is formed between the spacer mounting portion and the inner circumferential surface of the flange, and the axial extending portion is inserted into the spacer space.

Wherein the flange is axially connected to the hub at one or both sides thereof; And a body portion extending radially outward from the connection portion and having a reduced thickness than the connection portion.

The flange includes a plurality of bolt engaging portions to which hub bolts are mounted and are arranged to be spaced apart in the circumferential direction; And a concave portion formed between the plurality of bolt coupling portions so as to be reduced in thickness in the axial direction than the bolt coupling portion.

The recess may have at least one or more openings axially opened.

And a face spline is formed on the other surface of the hub such that a tooth profile and a tooth groove are alternately arranged along the circumferential direction.

The hub includes a forming part bent radially outward at one end thereof; A distal end bent radially outwardly from the other end; And an intermediate portion extending radially outward from the other side of the flange, wherein the flange is axially fixed between the forming portion and the intermediate portion, and the inner ring is fixed to the inner ring mounting portion formed between the intermediate portion and the distal end portion, And is fixed in the axial direction.

And the spacer is disposed between the forming portion and the flange.

The hub includes a spacer mounting portion on which the spacer is mounted; And a flange mounting part on which the flange is mounted on the other side of the spacer mounting part, wherein a hub spline is formed on an outer circumferential surface of the flange mounting part, the hub spline being alternately arranged along a circumferential direction, And spline-coupled to the flange spline formed on the inner circumferential surface.

A spacer space is formed between the spacer mounting portion and the inner circumferential surface of the flange, and the axial extending portion is inserted into the spacer space.

And a face spline is formed on the other surfaces of the inner ring such that teeth and teeth are alternately arranged along the circumferential direction.

A second hub spline is formed on at least a part of the outer circumferential surface of the inner ring mounting portion and the second hub spline is splined to an inner ring spline formed on the inner circumferential surface of the inner ring.

A method of manufacturing a wheel bearing according to an embodiment of the present invention includes a first step of assembling an outer ring to a hub; A second step of press-fitting the inner ring into the hub; A third step of assembling a flange having a specific gravity smaller than that of the hub to the hub, a fourth step of assembling a spacer to the hub to support a load generated when the orbital forming is performed, And a fifth step of bending one end of the hub outwardly in radius through an orbital forming process.

In the first step, the hub may be manufactured by a forging method such that a hub spline and a face spline are formed on the outer circumferential surface and the other surface of the hub.

In the third step, the flange may be splined to the hub.

In the third step, the hub spline may be characterized in that the heat treatment process is omitted.

In the fourth step, a lip portion of a rubber material is attached to one end of the spacer.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in an effort to solve the above problems, and it is an object of the present invention to provide a hub and a flange of a material different from that of the hub. This has the effect of improving the fuel economy of the vehicle.

Further, by mounting the spacer on one side of the flange, it is possible to prevent the flange from being deformed even if one end of the hub is machined.

Furthermore, by providing the spacer with the rubber member, it is possible to effectively prevent foreign matter from intruding from the outside.

1 is a partially cutaway perspective view of a wheel bearing according to an embodiment of the present invention.
2 is a cross-sectional view of a wheel bearing according to an embodiment of the present invention.
3 is an enlarged view of "A" in Fig.
4 is an exploded perspective view of the wheel bearing according to the embodiment of the present invention.
5 is a flowchart of a method of manufacturing a wheel bearing according to an embodiment of the present invention.
6 is a partially cutaway perspective view of a wheel bearing according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

For convenience of explanation, the axially closer side (left side in the figure) of the wheel is referred to as "one side", "one side", "one side" Quot; other side ", " other end ", " other end "

The parts denoted by the same reference numerals throughout the specification mean the same or similar components.

2 is a sectional view of a wheel bearing according to an embodiment of the present invention, and Fig. 3 is an enlarged view of "A" in Fig. 2. Fig.

The wheel bearings shown in Figs. 1 and 2 illustrate one of various kinds of wheel bearings for convenience of description. The technical idea of the present invention is not limited to the wheel bearings exemplified in this specification, Type wheel bearings.

1 and 2, a wheel bearing according to an embodiment of the present invention includes a hub 10, a flange 200 provided to mount the wheel at one side of the hub 10, a hub 10 An outer ring 12 provided at a predetermined distance from the outer side in the radial direction of the inner ring 11 and a radially outer space 12 which closes the radial space between the inner ring 11 and the outer ring 12, A first rolling member 13 provided between the inner ring 11 and the outer ring 12 and a second rolling member 13 provided between the hub 10 and the outer ring 12, And a body 14.

The hub 10 may be made of a high carbon steel material and includes a forming portion 15 extending radially outwardly from one side thereof, a flange mounting portion 25 on which the flange 200 is mounted, and a flange mounting portion 25 on the other side of the flange mounting portion 25 An inner ring mounting portion 35 into which the inner ring 11 is press-fitted, and a step portion 45 extending from the inner ring mounting portion 35 to the other side in the axial direction.

The forming portion 15 extends straight in the axial direction of the hub before the orbital forming, but after the orbital forming, the forming portion 15 is bent outward in the radial direction to be plastically deformed. The forming section 15 fixes the flange 200 and the inner ring 11 mounted on the hub 10 in the axial direction while being orbitally formed, Role.

On the outer circumferential surface of the flange mounting portion 25, hub splines 125 constituted by teeth and tooth grooves are alternately formed along the circumferential direction. The hub splines 125 may be splined to the flange splines 135 formed on the inner circumferential surface of the flange 200. Accordingly, the hub spline 125 is firmly fastened to the flange 200. On the other hand, since the hub 10 is made of a material having a relatively higher hardness than the flange 200, when the hub spline 125 and the flange spline 135 are spline coupled, the hub spline 125 is subjected to a separate heat treatment The durability and performance of the hub spline 125 can be maintained.

The inner ring 11 is press-fitted into the inner ring mounting portion 35. That is, the inner ring 11 is forcibly press-fitted into the forced press-fitting portion 137 formed on the outer peripheral surface of the inner ring mounting portion 35.

The stepped portion 45 has a step outside the radial outside from the other side of the inner ring mounting portion 35 and extends to the other side in the axial direction. A hub raceway 32 is formed on the outer peripheral surface of the step portion 45 and a distal end portion 50 extending radially outwardly may be formed on the other end of the step portion 45.

A face spline 150 is formed on the other side of the distal end portion 50. The face spline 150 is composed of a tooth and a tooth, and the tooth and the tooth may extend in the radial direction and be provided alternately along the circumferential direction. The face spline 150 formed in the distal end portion 50 is splined to one end of a constant velocity joint rotating (not shown). Therefore, the driving force of the engine can be smoothly transmitted to the wheel bearing.

According to the conventional technique, after the distal portion 50 is orbital-shaped and bent outwardly of the radius, the face spline is formed on the other surface. In the course of forming the face spline on the other side of the distal end portion 50, an excessive hoop stress is transmitted to the inner ring 11 or the rolling elements 13, 14, and the inner ring or rolling elements 11 , 13, 14) could be broken or indentations on its surface could occur. Particularly, when the face spline is formed, the pressing force generated at the distal end portion 50 is transmitted to the rolling elements 13 and 14 as they are, and an excessive preload can be imparted. Further, stress is concentrated on the distal end portion 50, and cracks or cracks may occur.

However, according to the embodiment of the present invention, the hub 10 is heated to a high temperature and then the forging is started, and the face spline 150 is formed on the other surface of the end portion 50 by warm- As well as problems such as stress concentration can be avoided.

The flange 200 is mounted on the outer peripheral surface of the flange mounting portion 25 and is formed to extend radially outward. The flange 200 is formed of a piece of light material that is separate from the hub 10. For example, the flange 200 may be made of CFRP (Carbon Fiber Reinforced Plastics), aluminum, or a magnesium alloy material of high strength and light weight. Considering that the hub 10 is typically made of steel carbon steel (for example, S55CR), the wheel bearing according to the embodiment of the present invention is formed by integrally forming the flange 200 and the hub 10 The weight is significantly reduced compared to the configuration.

The flange 200 includes a coupling portion 215 coupled to the hub and a body portion 225 extending radially outward from the coupling portion 215. Since the connection portion 215 coupled to the hub 10 takes a relatively large load, its axial thickness is formed thicker than the body portion 225. The connecting portion 215 is formed in the radially inner portion of the flange 200 coupled with the hub 10 such that the thickness of the connecting portion 215 is relatively thick in the axial direction and the body portion 225, And extends radially outwardly from the base 215. Therefore, the flange 200 can be reduced in its overall weight while maintaining its function and durability.

On the inner circumferential surface of the flange 200, a flange spline 135 is formed in which teeth and teeth are alternately arranged along the circumferential direction. The flange splines 135 are splined to the hub splines 125 and the flanges 200 are rigidly mounted to the hub 10 via up spline engagement.

The flange 200 may be formed with a bolt coupling part 160 to which the hub bolt 19 is fastened to one side or the other side in the axial direction. A bolt hole 17 is formed in the bolt coupling part 160 so that the hub bolt 19 can be fixedly mounted on the bolt coupling part 160. The hub bolt (17) may be equipped with a wheel or a disk.

A plurality of concave portions 170 may be formed between the plurality of bolt coupling portions 160 so as to be thinner than the axial thickness of the bolt coupling portion 160 along the circumferential direction. Also, at least one or more opening portions 175, which are axially opened, are formed in the plurality of recesses 170, and the opening portions 175 may have a circular cross section.

The bolt connecting portion 160 having a large load is formed thick and the concave portion 170 having a relatively smaller load than the bolt connecting portion 160 has a thin thickness so as to secure its durability, The total weight of the battery 200 can be reduced. Further, by the opening 175 formed in the concave portion 170, the total weight of the flange 200 can be further reduced.

The inner ring 11 is press-fitted into the forced press-fit portion 137 formed on the outer peripheral surface of the inner ring mounting portion 35 and the inner race raceway 31 is formed on the outer peripheral surface of the inner ring 11. The inner ring 11 is firmly fixed in the axial direction by the forming of the forming portion 15 between the step portion 45 and the flange 200 as described above.

The outer ring 12 is formed into a hollow cylindrical shape so as to surround the outer circumferential surface of the hub 10. That is, a hollow in which the hub 10 and the inner ring 11 are inserted is formed inside the radius of the outer ring 12 along the hub axis. An outer ring flange 39 extending radially outward is formed on the outer circumferential surface of the outer ring 12 and an outer ring bolt hole 37 is formed in the outer ring flange 39 for mounting the wheel bearing on the vehicle body .

First and second outer raceways 41 and 42 are formed on inner circumferential surfaces of both ends of the outer race 12. The first outer race raceway 41 formed on the inner peripheral surface of the one end of the outer race 12 is formed to face the inner race raceway 31. [ The second outer race raceway 42 formed on the inner peripheral surface of the other end of the outer ring 12 is formed so as to face the hub raceway 32.

The sealing portions 51 and 52 can be coupled to both ends of the outer ring 12 and can be provided in the radial space between the outer ring 12 and the hub 10 and / To prevent penetration.

The first rolling member 13 is disposed between the inner raceway 31 and the first outer race raceway 41 and the second rolling member 14 is disposed between the hub raceway 32 and the second outer race raceway 42. [ Respectively. A ball or a roller may be used for the first rolling member 13 and the second rolling member 14.

Each of the ball bearings including the first and second rolling elements 13 and 14 can be spaced apart from each other by a retainer or a cage 28 at regular intervals in the circumferential direction.

The wheel bearing according to the embodiment of the present invention further includes the spacer 100. [ The spacer 100 is provided between the forming section 15 and the flange 200. The spacer 100 absorbs a load generated when the forming portion 15 is formed radially outward, thereby preventing the flange 200 from being deformed. For example, when the forming section 15 is configured to directly contact the flange 200 without the spacer 100, when the forming section 15 is molded, an excessive load is directly transmitted to the flange 200 of the lightweight material . Therefore, according to the embodiment of the present invention, since the forming section 15 is arranged at a certain distance in the axial direction from one surface of the flange 200 and the spacer 100 is provided therebetween, The deformation of the flange 200 from the generated load can be minimized.

The spacer 100 may be press-fitted into the outer circumferential surface of the spacer mounting portion 20 formed between the forming portion 15 and the flange mounting portion 25, and a description related thereto will be described later in detail with reference to FIG.

The spacer 100 includes a radial extension portion 110 and an axial extension portion 120, and may be formed of a cast iron or a lightweight material.

The radial extending portion 110 is formed in a ring shape and interposed between the other surface of the forming portion 15 and one surface of the flange 200. The radial extension 110 extends radially outwardly and both sides thereof are completely in close contact with the respective surfaces of the forming portion 15 and the flange 200.

The axial extension 120 extends in a cylindrical shape from the radially inner end of the radial extension 110 to the other axial end.

The inner peripheral surface of the flange 200 can be divided into a portion in which the flange splines 135 are formed and a portion in which the flange splines 135 are not formed so that the portion where the flange splines 135 are formed is the flange splines 135 And the portion where the flange spline 135 is not formed corresponds to the spacer mounting portion 20. [0064] As shown in Fig. Therefore, when the flange 200 is splined to the hub 10, a spacer space S is formed between the inner peripheral surface of the flange 200 on which the flange splines 135 are not formed and the outer peripheral surface of the flange mounting portion 25 do. And the axially extending portion 120 of the spacer 100 is inserted into the spacer space S. When the spacer 100 is coupled through the upper spacer space S, a separate space for mounting the spacer 100 may not be formed. Further, the spacer 100 can be press-fitted between the inner circumferential surface of the flange 200 and the outer circumferential surface of the spacer mounting portion 20 to come in close contact with each other. At this time, the thickness D of the axially extending portion 120 is set to be larger than the thickness of the hub spline 125 or the flange spline 135, so that the adhesion of the spacer 100 can be improved.

When the spacer 100 is interposed between the flange 200 and the forming portion 15, the spacer 100 suffers a bushing function. When the preform is applied in the forming portion 15, The hub 200 is more firmly fixed to the hub 10. Even if a part of the hub 10 is machined as in forming the forming section 15, the impact can not be transmitted to the flange 200 and the spacer 100 can be mitigated.

Even if the spacer 100 is assembled so as to be in close contact with the flange 200 and the spacer mounting portion 20, in the process of forming the forming portion 15 by molding the one end of the hub 10 outward in the radial direction, ) And the spacer mounting portion 20 can be generated. According to the embodiment of the present invention, the lip portion 130 of the rubber material is provided at the other end of the axial extension portion 120, because external foreign substances may enter into the excitation space F.

The lip portion 130 is formed to enclose at least a part of the axial extension portion 120 and completely blocks the excitation space F between the spacer 200 and the spacer mounting portion 20. [ Therefore, foreign substances from entering the fine gap between the flange 200 and the flange mounting portion 25 are blocked.

FIG. 4 is an exploded perspective view of a wheel bearing according to an embodiment of the present invention, and FIG. 5 is a flowchart illustrating a method of manufacturing a wheel bearing according to an embodiment of the present invention. Each step shown in FIG. 4 is defined for convenience of explanation, and the claims are not limited by the order shown in FIG.

4 to 5, a method of manufacturing a wheel bearing includes a first step S301 of assembling the outer ring 12 to the hub 10, a second step S302 of assembling the inner ring 11 to the hub 10, A third step S303 of assembling the flange 200 to the hub 10, a fourth step S304 of assembling the spacer 100 to the hub 10, and a fourth step S304 of assembling the hub 10, And a fifth step (S305) of forming the forming section 15.

In the first step S301, the outer ring 12 is axially spaced apart from the hub 10 by a predetermined distance. The hub 10 is manufactured by hot forging with a material such as high carbon steel and at least a hub spline 125 and a face spline 150 and a curved hub raceway 32 are formed in the hub 10 do. The upper splines 125 and 150 can be made in an on- The second rolling member 14 is received between the outer circumferential surface of the hub 10 and the inner circumferential surface of the outer ring 12 and the second rolling member 14 is seated on the hub raceway 32, 10).

In the second step S302, the inner ring 11 is pressed into the outer peripheral surface of the hub 10. The other end of the inner ring 11 is fixed in the axial direction by a step 45 formed in the hub 10 and is provided between the inner race raceway 31 formed on the outer peripheral surface thereof and the inner peripheral surface of the outer ring 12, (13) is accommodated.

In the third step S303, the flange 200 is assembled to the hub 10. The flange 200 is formed of a material having a specific gravity relatively smaller than the material of the hub 10. In the third step S301, the hub spline 125 formed on the outer peripheral surface of the hub 10 and the flange splines 135 formed on the inner peripheral surface of the flange 200 are spline coupled to each other. At this time, a separate heat treatment step is omitted for the hub spline 125.

In a fourth step S304, the spacer 100 is assembled to the hub 10 at one side of the flange 200. The spacer 100 is generally configured to seal the space between the hub 10 and the flange 200 in the form of a ring. Meanwhile, in order to improve the sealing performance, a lip portion 130 of a rubber material may be wrapped around a part of the spacer 100.

In the fifth step S305, the orbital forming process is performed so that the forming section 15 of the hub 10 is plastically deformed radially outward. The flange 200 and the inner ring 11 are axially fixed to the hub 10 while the forming section 15 is bent radially outwardly while a preload is applied to the first and second rolling elements 13, .

According to the above method, the flange 100 is made of a material different from the hub 10 of high carbon steel, and is not separately formed with the hub 10 but is separately mounted to the hub 10. Therefore, the total weight of the wheel bearing can be reduced. In addition, even if the flange 200 is formed of a relatively light material, the load generated during the molding of the forming unit 15 in the fifth step S305 can not be transmitted to the flange 200 and is absorbed by the spacer 100 do. Therefore, deformation of the flange 200 can be prevented.

6 is a partially cutaway perspective view of a wheel bearing according to another embodiment of the present invention.

The wheel bearing according to another embodiment of the present invention is generally similar in structure to the wheel bearing according to the embodiment of the present invention but the flange 200 and the inner ring 11 are spaced from each other in the axial direction, . Hereinafter, the present invention will be described focusing on differences from the embodiments of the present invention.

6, the hub 10 includes a forming portion 15, a spacer mounting portion 20, a flange mounting portion 25, a middle portion 70, an inner ring mounting portion 35, and a distal portion 50 .

A spacer 100 is mounted on the outer circumferential surface of the spacer mounting portion 20 and a flange 200 of a material different from that of the hub 10 is mounted on the outer circumferential surface of the flange mounting portion 25 separately. The spacer 100 is disposed between the flange 200 and the forming section 15 and may serve to buffer a load generated when the forming section 15 is processed. While the flange 200 and the hub 10 are spline coupled to each other through the flange splines 135 and the first hub splines 125. [

The intermediate portion 70 includes a first stepped portion 71 extending radially outwardly from one side thereof and a second stepped portion 73 extending radially outward from the other side. One surface of the first step portion 71 contacts the other surface of the flange 200 and serves to fix the flange 200. The second stepped portion 73 contacts one surface of the inner ring 11 and serves to fix the inner ring 11 in the axial direction.

The inner ring (11) is mounted on the outer peripheral surface of the inner ring mounting portion (35). That is, the second hub spline 155 formed on the outer peripheral surface of the inner ring mounting portion 35 is splined to the inner ring spline 165 formed on the inner peripheral surface of the inner ring 11. A face spline 160 is formed on the other surface of the inner ring 11 to perform spline coupling to one end of a constant velocity joint (not shown) rotating.

The distal end portion 50 is plastically deformed radially outward to fix the inner ring 11.

If the face spline 160 is formed on the other surface of the inner ring 11 and the inner ring 11 and the constant velocity joint are splined to each other as described above, splines are not required to be formed on the other surface of the distal portion 50, It is possible to prevent the excessive stress from being caught on the inner ring 11 in the process of forming the spline 100. [

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

Claims (23)

A wheel bearing comprising a hub, an inner ring coupled to the hub, and an outer ring spaced from the hub and the inner ring and surrounding the hub,
A flange splined to the hub and formed of a material having a specific gravity that is relatively smaller than that of the hub; And
A spacer provided at one side of the flange to support a load generated when the hub is orbitally formed;
.
The method according to claim 1,
Wherein the spacer is provided with a lip portion for sealing a space between the flange and the hub.
3. The method of claim 2,
The spacer
A radial extension extending radially in contact with one surface of the flange; And
An axially extending portion extending axially on the radially inner end of the radially extending portion and disposed between the outer peripheral surface of the hub and the inner peripheral surface of the flange;
.
The method of claim 3,
Wherein the lip portion is formed so as to surround at least a part of the axially extending portion.
5. The method of claim 4,
The hub
A forming part bent radially outward from the one end thereof; And
A stepped portion spaced apart from the forming portion by a predetermined distance in the axial direction and having a stepped portion outside the radius;
/ RTI >
Wherein the flange and the inner ring are axially fixed between the forming portion and the step portion.
6. The method of claim 5,
Wherein the spacer is disposed between the forming portion and the flange.
The method according to claim 6,
The hub
A spacer mounting portion on which the spacer is mounted; And
A flange mounting portion on which the flange is mounted on the other side of the spacer mounting portion;
Further comprising:
Wherein a hub spline is formed on an outer circumferential surface of the flange mounting portion, the hub spline having teeth and tooth grooves alternately arranged along the circumferential direction,
The hub spline
And is splined to a flange spline formed on the inner circumferential surface of the flange.
8. The method of claim 7,
A spacer space is formed between the spacer mounting portion and the inner peripheral surface of the flange,
And the axially extending portion is inserted into the spacer space.
9. The method of claim 8,
The flange
A connecting portion which is axially connected to the hub on one surface or the other surface thereof; And
A body extending radially outward from the connection portion and having a reduced thickness than the connection portion;
Wherein the wheel bearing comprises:
10. The method of claim 9,
The flange
A plurality of bolt engaging portions to which hub bolts are mounted and are arranged to be spaced apart in the circumferential direction; And
A recessed portion formed between the plurality of bolt coupling portions so as to be reduced in thickness in the axial direction than the bolt coupling portion;
Further comprising:
11. The method of claim 10,
Wherein at least one or more openings axially opened are formed in the concave portion.
The method of claim 3,
On the other side of the hub
And a face spline is formed such that the tooth profile and the tooth groove are alternately arranged along the circumferential direction.
5. The method of claim 4,
The hub
A forming part bent radially outward from the one end thereof;
A distal end bent radially outwardly from the other end; And
An intermediate portion extending radially outward from the other side of the flange;
, ≪ / RTI &
Wherein the flange is fixed in the axial direction between the forming portion and the intermediate portion, and the inner ring is press-fitted into the inner ring mounting portion formed between the intermediate portion and the end portion and is fixed in the axial direction.
14. The method of claim 13,
Wherein the spacer is disposed between the forming portion and the flange.
14. The method of claim 13,
The hub
A spacer mounting portion on which the spacer is mounted; And
A flange mounting portion on which the flange is mounted on the other side of the spacer mounting portion;
Further comprising:
Wherein a hub spline is formed on an outer circumferential surface of the flange mounting portion, the hub spline having teeth and tooth grooves alternately arranged along the circumferential direction,
The hub spline
And is splined to a flange spline formed on the inner circumferential surface of the flange.
16. The method of claim 15,
A spacer space is formed between the spacer mounting portion and the inner peripheral surface of the flange,
And the axially extending portion is inserted into the spacer space.
17. The method of claim 16,
On the other surface of the inner ring
And a face spline is formed such that the tooth profile and the tooth groove are alternately arranged along the circumferential direction.

18. The method of claim 17,
A second hub spline is formed on at least a part of the outer circumferential surface of the inner ring mounting portion, and the second hub spline is splined to an inner ring spline formed on an inner circumferential surface of the inner ring.
A first step of assembling the outer ring to the hub;
A second step of press-fitting the inner ring into the hub;
A third step of assembling a flange having a specific gravity smaller than that of the hub to the hub;
A fourth step of assembling a spacer to the hub to support a load generated when orbital forming; And
A fifth step of bending one end of the hub outwardly in radius through an orbital forming process;
Wherein the wheel bearing is manufactured by a method of manufacturing a wheel bearing.
20. The method of claim 19,
Wherein in the first step, the hub is manufactured by forging so that a hub spline and a face spline are formed on the outer circumferential surface and the other surface of the hub.
20. The method of claim 19,
And in the third step, the flange is splined to the hub.
22. The method of claim 21,
Wherein in the third step, the hub splines are omitted from the heat treatment step.
20. The method of claim 19,
Wherein in the fourth step, a lip portion of a rubber material is attached to one end of the spacer.


KR1020150142408A 2015-10-12 2015-10-12 Wheel bearing and manufacturing method of the same KR101779788B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019139456A1 (en) * 2018-01-15 2019-07-18 주식회사 일진글로벌 Bearing hub of wheel bearing and method for manufacturing bearing hub
WO2019182419A1 (en) * 2018-03-23 2019-09-26 주식회사 일진글로벌 Wheel hub and wheel bearing comprising same
KR20200032059A (en) * 2018-03-23 2020-03-25 주식회사 일진글로벌 Wheel hub and wheel bearing comprising same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003080902A (en) * 2001-09-12 2003-03-19 Ntn Corp Bearing device for driving wheel
JP2008055984A (en) * 2006-08-30 2008-03-13 Ntn Corp Bearing device for wheel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019139456A1 (en) * 2018-01-15 2019-07-18 주식회사 일진글로벌 Bearing hub of wheel bearing and method for manufacturing bearing hub
KR20190086824A (en) * 2018-01-15 2019-07-24 주식회사 일진글로벌 Bearing hub of wheel bearing and method of manufacturing bearing hub
WO2019182419A1 (en) * 2018-03-23 2019-09-26 주식회사 일진글로벌 Wheel hub and wheel bearing comprising same
KR20190111653A (en) * 2018-03-23 2019-10-02 주식회사 일진글로벌 Wheel hub and wheel bearing comprising same
KR20200032059A (en) * 2018-03-23 2020-03-25 주식회사 일진글로벌 Wheel hub and wheel bearing comprising same

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