KR101814703B1 - Wheel bearing and jointing structure for wheel bearing and drive shaft - Google Patents

Wheel bearing and jointing structure for wheel bearing and drive shaft Download PDF

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Publication number
KR101814703B1
KR101814703B1 KR1020160004441A KR20160004441A KR101814703B1 KR 101814703 B1 KR101814703 B1 KR 101814703B1 KR 1020160004441 A KR1020160004441 A KR 1020160004441A KR 20160004441 A KR20160004441 A KR 20160004441A KR 101814703 B1 KR101814703 B1 KR 101814703B1
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KR
South Korea
Prior art keywords
outer ring
hub
press
ring
iron
Prior art date
Application number
KR1020160004441A
Other languages
Korean (ko)
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KR20170084959A (en
Inventor
이준호
Original Assignee
주식회사 일진글로벌
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Priority to KR1020160004441A priority Critical patent/KR101814703B1/en
Publication of KR20170084959A publication Critical patent/KR20170084959A/en
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Publication of KR101814703B1 publication Critical patent/KR101814703B1/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
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/18—Arrangement 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
    • B60B27/0005—Hubs with ball bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0078—Hubs characterised by the fixation of bearings
    • 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
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7806—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for spherical 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
    • 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

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

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel bearing, a wheel bearing, and a driving shaft fastening structure having improved durability, improved driving efficiency, and ensuring sealing performance.
A wheel bearing according to an embodiment of the present invention includes: a hub having a stepped portion formed on an inner side thereof and a wheel mounted on an outer side thereof; An outer ring disposed to surround an outer circumferential surface of the hub; An inner ring which is press-fitted into a stepped portion of the hub; A rolling member interposed between the hub and the outer ring and between the inner ring and the outer ring; And a sealing device mounted between an inner end of the outer ring and an inner end of the inner ring.
The sealing device may include an outer ring iron member which is press-fitted into an inner end of the outer ring and extends obliquely inward of the hub.

Description

WHEEL BEARING AND JOINTING STRUCTURE FOR WHEEL BEARING AND DRIVE SHAFT BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel bearing, a wheel bearing and a driving shaft coupling structure, and more particularly, to a wheel bearing and a wheel bearing and a driving shaft coupling structure with durability and sealing performance secured by a simple structure.

Generally, a bearing is a device mounted between a rotating element and a non-rotating element to facilitate rotation of the rotating element. Currently, various bearings such as roller bearings, tapered bearings, and needle bearings are used.

Wheel bearings are one type of such bearings, which rotatably connect a drive shaft, which is a rotating element, to a vehicle body, which is a non-rotating element. The wheel bearing includes an inner ring (and / or hub) connected to one of the drive shaft and the vehicle body, an outer ring connected to the other one of the drive shaft or the vehicle body, and a rolling member interposed between the outer ring and the inner ring.

These wheel bearings are basically mounted on the wheels of the vehicle, and thus are exposed to foreign substances such as dust and moisture. If such foreign matter penetrates into the interior of the wheel bearing, particularly the portion where the rolling element is mounted, the raceway, which is a polishing surface, may be damaged. Such a damaged raceway may cause noise and vibration during operation of the wheel bearing and shorten the life of the wheel bearing. Therefore, a sealing device is mounted at one or both ends of the wheel bearing to prevent foreign matter from entering from the outside.

The sealing device of the wheel bearing usually consists of one steel member mounted on the outer ring of the wheel bearing and another steel member mounted on the inner ring or hub and a sealing member disposed therebetween to perform sealing. Further, a plurality of lips are formed on the sealing member to contact the steel members. Furthermore, the sealing member may be formed of a material having elasticity such as rubber.

However, if a plurality of lips are formed on the sealing member, if the lip of the same material as the rubber is worn, the sealing performance may deteriorate. In addition, when the number of the ribs contacting the steel members increases, the resistance against the rotational force of the drive shaft increases, and the driving efficiency may be lowered. On the other hand, if the shape of the sealing member and the configuration of the sealing device are complicated for enhancing the sealing performance, the cost is increased and the manufacturing process of the wheel bearing may be complicated.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a wheel bearing, a wheel bearing, and a drive shaft fastening structure with improved durability, improved driving efficiency, .

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a wheel bearing comprising: a hub having a stepped portion formed on an inner side thereof and a wheel mounted on an outer side thereof; An outer ring disposed to surround an outer circumferential surface of the hub; An inner ring which is press-fitted into a stepped portion of the hub; A rolling member interposed between the hub and the outer ring and between the inner ring and the outer ring; And a sealing device mounted between an inner end of the outer ring and an inner end of the inner ring.

The sealing device may include an outer ring iron member which is press-fitted into an inner end of the outer ring and extends obliquely inward of the hub.

The outer steel member may extend between the inner side and the radially inner side of the hub.

Wherein the outer wheel iron material comprises: an outer ring press-in portion, one end of which is press-fitted into the inner circumferential surface of the outer ring between the outer ring and the inner ring; A first extending portion that is bent and extends from the other end of the outer ring press-fitting portion toward the center axis of the hub; And a second extension extending from the elongated first extension to an inner side and a radially inner side of the hub.

And a through hole may be formed in the second extension portion at a lower portion of the outer ring iron material.

And a through hole may be formed in the first extension portion and the second extension portion, respectively, at a lower portion of the outer ring iron material.

Further comprising an inner wheel iron member which is press-fitted into an inner end of the inner ring and which has an inner iron extension portion extending radially outward of the hub, the inner iron extension portion being extended toward the outer wheel press-in portion, Can be close to the first extension of the iron.

The coupling structure of the wheel bearing and the driving shaft according to the embodiment of the present invention includes a hub connected to the wheel, an outer ring connected to the vehicle body, a rolling member interposed between the hub and the outer ring, and an inner side Wherein the sealing device includes an outer iron member which is press-fitted into an inner end of the outer ring and extends between an inner side of the hub and a radially inner side of the hub, The drive shaft may have a protrusion protruding outward in the radial direction, and an extended end of the outer wheel iron may be fastened to the protrusion of the drive shaft.

Wherein the outer wheel iron material comprises: an outer ring press-in portion, one end of which is press-fitted into the inner circumferential surface of the outer ring between the outer ring and the inner ring; A first extending portion that is bent and extends from the other end of the outer ring press-fitting portion toward the center axis of the hub; And a second extension extending from the elongated first extension to an inner side and a radially inner side of the hub.

And the extended end of the second extension part can be caught by the protrusion of the drive shaft.

The inner diameter of the second extended portion may be smaller than the outer diameter of the projecting portion of the drive shaft.

A sealing member mounted on the second extending portion may be disposed between the extended end of the second extending portion and the protruding portion of the drive shaft.

The sealing member may be formed with a protruded lip to be in contact with the projection of the driving shaft.

And a through hole formed in the second extension portion may be formed in the lower portion of the outer ring iron.

And a through hole formed in the first and second extension portions may be formed in the lower portion of the outer ring iron.

As described above, according to the embodiment of the present invention, the outer ring steel material is formed so as to change the intrusion path of the foreign matter, so that the sealing performance can be enhanced.

In addition, since the number of ribs is minimized or the ribs are eliminated, durability is improved and driving efficiency can be improved.

Further, the protruding portion is formed in the drive shaft, and the hollow inner diameter of the outer ring iron member is formed to be smaller than the outer diameter of the drive shaft in the portion where the protruding portion is formed, so that the penetration of foreign matter passing through the outer ring iron member by the drive shaft from the vehicle body side can be minimized.

1 is a configuration diagram of a wheel bearing according to an embodiment of the present invention.
2 is a top enlarged view of a sealing device according to an embodiment of the present invention.
3 is a bottom enlarged view of a sealing device according to an embodiment of the present invention.
4 is an axial view of the outer ring of a sealing device according to an embodiment of the present invention.
5 is a configuration diagram of a wheel bearing according to another embodiment of the present invention.
6 is a top enlarged view of a sealing device according to another embodiment of the present invention.
7 is a bottom enlarged view of a sealing device according to another embodiment of the present invention.
FIG. 8 is an axial view of the outer circumference of a sealing device 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.

1 is a configuration diagram of a wheel bearing according to an embodiment of the present invention.

1, a wheel bearing 1 according to an embodiment of the present invention includes a hub 10, an inner ring 20, an outer ring 30, a rolling body 50, and a sealing device 100 do.

The hub 10 is formed in a hollow cylindrical shape such as a cylinder. Further, the hub 10 is engaged with a wheel (not shown) of the vehicle and a drive shaft 5.

A flange 12 protruding radially outward is formed at one side of the hub 10, and a pilot 16 protruding in the axial direction of the hub is formed. A bolt hole 14 is formed in the flange 12 so that the wheel of the vehicle can be coupled to the hub 10 by a coupling means such as a bolt and the pilot 16 is inserted into the hub 10, when the wheel is mounted on the wheel, it is inserted into the wheel and guides the mounting of the wheel.

A stepped portion 18 is formed on the other side of the hub 10 and the forming portion 19 extends in the axial direction from the stepped portion 18. The forming section 19 extends in a straight line parallel to the axial direction of the hub 10 before orbital forming, but is bent outward along the radial direction by orbital forming. A hub orbit surface 17 is formed on the outer circumferential surface of the hub 10 between the stepped portion 18 and the flange 12. The hub orbital surface 17 is an orbital surface of the rolling member 50 formed for rolling contact of the rolling member 50 to be described later.

One end of the hub 10 is defined on the outer side of the hub 10 near the wheel and the other end of the hub 10 is defined on the inner side of the hub 10 close to the vehicle body 3. In the following description, one side and the other side, the outer side and the inner side of the components constituting the wheel bearing 1 refer to a part of the hub 10 in the same direction as the one end, the other end, or the outer side and the inner side, respectively.

The inner ring 20 is formed in a hollow cylindrical shape so as to be pressed into the stepped portion 18 of the hub 10. That is, the inner ring 20 is coupled to the outer peripheral surface of the hub 10 on which the step portion 18 is formed. An inner ring raceway surface 28 is formed on the outer circumferential surface of the inner ring 20. The inner ring raceway surface 28 is the raceway surface of the rolling member 50 formed for rolling contact of the rolling member 50 to be described later.

The outer ring 30 is formed in a hollow cylindrical shape so as to surround the outer circumferential surface of the hub 10. That is, the outer ring 30 is formed with a hollow through which the hub 10 and the inner ring 20 are inserted along the central axis. An outer ring first raceway surface 37 and an outer ring second raceway surface 38 are formed on inner circumferential surfaces of the outer ring 30 and opposed to the hub raceway surface 17 and the inner ring raceway surface 28, respectively. Here, the first and second outer race surfaces 37 and 38 are the raceway surfaces of the rolling member 50 formed for rolling contact of the rolling member 50 to be described later. Further, a flange 32 protruding radially outward is formed on a part of the outer peripheral surface of the outer ring 30. A bolt hole (34) is formed in the flange (32) so that the outer ring (30) can be coupled to the vehicle body (3) by a coupling means such as a bolt.

A plurality of rolling elements 50 are disposed between the hub 10 and the outer ring 30 and / or between the inner ring 20 and the outer ring 30. The rolling member 50 is disposed between the hub raceway surface 17 and the outer race first raceway surface 37 and between the inner race race surface 28 and the outer race second raceway surface 38 Respectively. That is, the plurality of rolling elements 50 may be arranged in a double-row including the first rolling element row 52 and the second rolling element row 54. The first rolling member train 52 is disposed between the hub 10 and the outer race 30, that is, between the hub raceway surface 17 and the outer race first raceway surface 37, 2 rolling element row 54 is disposed between the inner ring 20 and the outer ring 30, that is, between the inner ring raceway surface 28 and the outer ring second raceway surface 38. [ Meanwhile, the rolling member 50 may have various shapes depending on the trajectory. For example, the rolling member (50) may be in the shape of a ball, a cylinder, or the cylindrical rolling member (50) having a tapered shape whose diameter gradually decreases along the longitudinal direction. That is, although the ball-shaped rolling member 50 is shown in Fig. 1, it is not limited thereto. The plurality of rolling members 50 maintain a constant gap between the adjacent rolling members 50 by the retainer 60. [

The sealing device 100 may be configured to prevent foreign substances such as dust and moisture from entering the rolling member 50 and leakage of lubricant that smoothes the movement of the rolling member 50, And is mounted between the flange 12 of the hub 10 and the outer ring 30 and between the outer ring 30 and the inner ring 20, respectively. That is, the sealing device 100 is disposed on the outer side and the inner side of the space in which the two rolling elements 52 and 54 are disposed, and the shape and configuration of the sealing device 100 may be changed according to the condition of the disposed position.

The configuration of the wheel bearing 1 including the hub 10, the inner ring 20, the outer ring 30, the rolling body 50, and the sealing device 100 may be constructed by a person skilled in the art Hereinafter, those skilled in the art will appreciate that the detailed description thereof will be omitted.

FIG. 2 is a top enlarged view of a sealing device according to an embodiment of the present invention, FIG. 3 is a bottom enlarged view of a sealing device according to an embodiment of the present invention, FIG. 4 is a side view of a sealing device according to an embodiment of the present invention, Fig. 5 is an axial view of the steel material.

2 to 4, a sealing device 100 for a wheel bearing according to an embodiment of the present invention is related to a sealing device 100 mounted between the outer ring 30 and the inner ring 20 , The sealing device 100 includes an outer ring iron member 110, an inner ring iron member 120, and a sealing member 130.

The outer ring iron member 110 is formed in an annular shape and is an iron member that is press-fitted into the inner end of the outer ring 30. [ The outer ring iron member 110 includes an outer ring press-fitting portion 112, a first extension portion 114, and a second extension portion 116.

The outer ring press-fitting portion 112 is mounted on the inner circumferential surface of the outer ring 30 between the outer ring 30 and the inner ring 20. An inner circumferential surface of the outer ring 30 on which the one end of the outer ring press-fitting portion 112 is press-fitted and mounted at the inner end of the outer ring 30 will be referred to as an outer-wheel steel material press-in surface 36. [

The first extension portion 114 is bent and extends from the other end of the outer ring press-fitting portion 112 toward the hub central axis X (see FIG. 1). The first extension portion 114 is extended to cover the space between the outer ring 30 and the inner ring 20 as the outer ring press-fit portion 112 is press-fitted into the outer ring iron press- do. Meanwhile, the outer ring iron material 110 may be formed of a metal other than iron.

The second extension portion 116 is bent and extended from the extended first extension portion 114 to the inner side and the radially inner side of the hub 10. That is, the outer steel member 110 is an annular plate having a constant thickness formed in a shape in which the cross section cut in the radial direction is bent twice. The second extension portion 116 is formed to be inclined at a certain angle a1 with respect to the axial direction. 2, an axial imaginary line L1 parallel to the hub center axis X is shown to visually indicate the constant angle a1, and the constant angle a1 is defined by the imaginary line L1, Is shown as the angle of inclination of the second extension 116.

The inner ring iron member 120 is formed in an annular shape and is an iron member whose one end is press-fitted at the inner end of the inner ring 20. The inner ring iron member 120 includes an inner ring press-fitting portion 122 and an inner iron extension portion 124.

The inner ring press-fitting portion 122 is mounted on the outer circumferential surface of the inner ring 20 between the inner ring 20 and the outer ring 30. The outer circumferential surface of the inner ring 20 on which the one end of the inner ring press-fitting portion 122 is press-fitted and mounted at the inner end of the inner ring 20 is referred to as an inner-wheel iron material press-in surface 26.

The inward extending portion 124 is bent and extended from the one end of the inner ring press-fitting portion 122 radially outward of the hub 10. That is, the inner ring iron piece 120 is an annular plate having a constant thickness formed in a shape in which the cross section cut in the radial direction is once bent. Meanwhile, the inner ring iron member 120 may be formed of a metal other than iron. The extended inwardly extending portion 124 is close to the inner circumferential surface of the outer ring 30 in a state in which the inner ring press-fit portion 122 is press-fitted into the inner-wheel iron material press-in surface 26.

The sealing member 130 is coupled to the inner ring iron member 120 between the outer ring iron member 110 and the inner ring iron member 120. In addition, the sealing member 130 includes a lip 132 and a body portion 134.

The ribs 132 are formed so as to extend toward the first extended portion 114 of the outer ring iron member 110. The ribs 132 are formed to contact the first extension parts 114. Meanwhile, the lip 132 protrudes from the sealing member 130 coupled to the inner ring iron member 120 and is formed to extend.

The body portion 134 is a portion coupled to the inner ring iron member 120. That is, the lip 132 protrudes from the body portion 134. The body portion 134 is formed to fill a remaining space that the lip 132 does not occupy between the outer ring iron member 110 and the inner ring iron member 120 to a certain extent. Further, since the remaining space is partially filled, foreign matter is prevented from accumulating in the space between the outer and inner iron pieces 110 and 120, and the lip 132 is worn by the deposited foreign matter .

Referring to FIGS. 3 and 4, the outer steel member 110 further includes a through-hole 118.

At least one through hole 118 may be formed at a lower portion of the outer steel member 110, and a plurality of through holes 118 may be formed. The through hole 118 is formed in the second extension portion 116 of the outer ring iron member 110. Meanwhile, when a plurality of the through holes 118 are formed, the through holes 118 are radially drilled from the lower portion of the outer iron material 110.

1 to 3, the flow of foreign matter is indicated by an arrow. A foreign matter penetrated from the outside of the vehicle and moved toward the sealing apparatus 100 between the vehicle body 3 and the drive shaft 5 is guided to the inclined second extension portion 116 As shown in Fig. In addition, the foreign substances dropped to the lower portion of the outer steel member 110 fall downward through the through hole 118. Therefore, it is possible to prevent foreign matter from entering into the space between the outer and outer steel members 110 and 120 via the upper portion of the outer steel member 110, Foreign matter infiltrating between the first extended portion 114 of the outer wheel iron 110 and the inner wheel press-in portion 122 of the inner wheel iron member 120 can be minimized.

2 and 3, between the outer ring press-fit portion 112 of the outer ring iron member 110 and the inner iron extension portion 124 of the inner ring iron member 120, A gap g is usually formed between the outer ring press-fitting portion 114 and the inner ring press-fitting portion 122 of the inner-ring iron piece 120. According to the embodiment of the present invention, it is preferable that the gap g is 0.2 mm or less.

5 is a configuration diagram of a wheel bearing according to another embodiment of the present invention.

As shown in FIG. 5, the wheel bearing 2 according to another embodiment of the present invention has only a fastening structure with the sealing device 200 and the drive shaft 5, Is the same as that of the wheel bearing 1 according to the first embodiment of the present invention.

6 to 8, a coupling structure of the wheel bearing 2 with the sealing device 200 and the drive shaft 5 according to another embodiment of the present invention will be described.

FIG. 6 is a top enlarged view of a sealing device according to another embodiment of the present invention, FIG. 7 is a bottom enlarged view of a sealing device according to another embodiment of the present invention, FIG. 8 is a cross- Fig. 5 is an axial view of the outer appearance of the device.

6 to 8, a wheel bearing sealing device 200 according to another embodiment of the present invention includes a sealing device 200 mounted between the outer ring 30 and the inner ring 20, The sealing device 200 includes an outer steel member 210, an inner steel member 220, and a sealing member 230.

The outer ring iron member 210 is formed in an annular shape and is an iron member that is press-fitted into the inner end of the outer ring 30. The outer ring iron member 210 includes an outer ring press-fitting portion 212, a first extension portion 214, and a second extension portion 216.

The outer ring press-fitting portion 212 is mounted on the inner peripheral surface of the outer ring 30 between the outer ring 30 and the inner ring 20.

The first extending portion 214 is bent and extends from the other end of the outer ring press-fitting portion 212 toward the hub central axis X (see FIG. 5). The first extension portion 214 is extended to cover a predetermined space between the outer ring 30 and the inner ring 20 as the outer ring press-fitting portion 212 is press-fitted. Meanwhile, the outer iron material 210 may be formed of a metal other than iron.

The second extension 216 extends from the extended first extension 214 to the inner side and the radially inner side of the hub 10. That is, the outer steel member 210 is an annular plate having a constant thickness formed in a shape in which a section cut in the radial direction is bent twice. In addition, the second extension portion 216 is inclined at a certain angle a2 with respect to the axial direction. 6 shows an axial imaginary line L2 parallel to the hub center axis X in order to visually indicate the constant angle a2 and the constant angle a2 is defined by the imaginary line L2, Is shown as the angle of inclination of the second extension 216.

The inner ring iron member 220 is formed in an annular shape and is an iron member whose one end is press-fitted at the inner end of the inner ring 20. The inner ring iron member 220 includes an inner ring press-fitting portion 222 and an inner iron extension portion 224. [

The inner ring press-fitting portion 222 is mounted by press-fitting one end of the inner ring 20 between the inner ring 20 and the outer ring 30 onto the outer circumferential surface of the inner ring 20.

The inward extending portion 224 is bent and extended from the other end of the inner ring press-fitting portion 222 radially outwardly of the hub 10. That is, the inner ring iron piece 220 is an annular plate having a constant thickness formed in a shape in which the cross section cut in the radial direction is bent once. The inner ring iron material 220 may be formed of a metal other than iron. The extended inward-extending portion 224 is in contact with the outer-ring press-fitting portion 212 of the outer-wheel iron 210 in a state in which the inner-wheel press-fitting portion 222 is press-fitted. Further, the inwardly extending portion 224 is adjacent to the first extended portion 214 of the outer ring iron 210 in the axial direction.

The sealing member 230 is coupled to the outer steel member 210. Also, the sealing member 230 is provided on the inner peripheral side of the extended end of the second extension portion 216 of the outer ring iron member 210. Further, the sealing member 230 includes a lip 232.

The rib 232 protrudes radially inward of the second extension 216 of the outer steel member 210. Further, the lip 232 is formed to be in contact with a part of the driving shaft 5. Further, at least one or more of the ribs 232 may be formed, and a plurality of ribs 232 may be formed. 6 and 7 show that the two ribs 232 are formed, but the present invention is not limited thereto.

A portion of the drive shaft 5 to which the lip 232 is contacted is a protrusion 5a protruding radially outward from the drive shaft 5. [ The outer diameter of the protrusion 5a is larger than the inner diameter of the hollow 219 of the outer ring iron 210 by a predetermined value. Accordingly, when the wheel bearing 2 and the drive shaft 5 are engaged, the end of the second extension portion 216 of the outer ring iron member 210 is fastened to the protruding portion 5a of the drive shaft 5.

7 and 8, the outer steel member 210 further includes a first through hole 218a and a second through hole 218b.

The first through holes 218a and the second through holes 218b may be formed in a lower portion of the outer steel member 110, and at least one of the first through holes 218a and the second through holes 218b may be formed. The first through hole 218a is formed in the first extended portion 214 of the outer iron member 210. [ Also, the second through hole 218b is formed in the second extension portion 116 of the outer ring iron material 210. When a plurality of the first through holes 218a and the second through holes 218b are formed, the first through holes 218a and the second through holes 218b are connected to the outer iron material 210 ). ≪ / RTI >

5 to 7, the flow of foreign matter is shown by an arrow. A foreign matter penetrated from the outside of the vehicle and moved toward the sealing device 200 between the vehicle body 3 and the drive shaft 5 passes through the inclined second extension portion 216 As shown in Fig. Further, the foreign substances dropped to the lower portion of the outer ring iron member 210 fall downward through the second through hole 218b. The foreign matter penetrated into the gap between the inwardly extending portion 224 of the inner ring iron member 220 and the first extended portion 214 of the outer ring iron member 210 passes through the first through hole 218a, (10) and falls downward. Therefore, it is possible to prevent foreign matter from entering the space between the outer and the outer iron pieces 210 and 220 via the upper part of the outer iron piece 210, Foreign matter penetrating between the first extension portion 214 of the outer ring iron 210 and the inner iron extension portion 224 of the inner ring iron member 220 is minimized and the first extension portion 214 and the inner iron extension portion 224 A small amount of foreign matter penetrated through the first through hole 218a is discharged through the first through hole 218a.

The first extending portion 214 and the second extending portion 224 are adjacent to each other and the second through hole 218a is formed so that a sealing member 210 is interposed between the outer and inner iron pieces 210, And the lip can be removed, sealing performance can be secured.

As described above, according to the embodiment of the present invention, the outer iron materials 100 and 200 are formed so as to change the intrusion path of the foreign matter, thereby enhancing the sealing performance. Further, since the number of ribs 132 is minimized or the ribs 132 are eliminated, durability is improved and driving efficiency can be improved. The inner diameter of the hollow portion 219 of the outer ring iron member 210 is formed to be smaller than the outer diameter of the drive shaft 5 at the portion where the protrusion 5a is formed, 5 can minimize the penetration of foreign substances passing through the outer ring iron members 100 and 200. [

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 (14)

A hub having a stepped portion formed on an inner side thereof and a wheel mounted on an outer side thereof;
An outer ring disposed to surround an outer circumferential surface of the hub;
An inner ring which is press-fitted into a stepped portion of the hub;
A rolling member interposed between the hub and the outer ring and between the inner ring and the outer ring; And
A sealing device mounted between an inner end of the outer ring and an inner end of the inner ring;
, ≪ / RTI &
The sealing device includes an outer ring iron member having an outer ring press-fitting portion press-fitted into an inner end of the outer ring at one side and a second extending portion extending obliquely inward in a radial direction along a direction away from the outer- ,
And a through hole is formed in the second extension portion at a lower portion of the outer ring iron member. delete The method according to claim 1,
The one end of the outer ring press-fitting portion is press-fitted into the inner circumferential surface of the outer ring,
The outer ring iron member further includes a first extending portion bent and extended radially inwardly from the other end of the outer ring press-fitting portion,
And the second extending portion is bent and extends at a radially inner end of the first extending portion. delete The method of claim 3,
And a through hole is formed in the first extension portion and the second extension portion, respectively, at a lower portion of the outer ring iron member. 6. The method of claim 5,
Further comprising an inner ring iron member which is press-fitted into an inner end of the inner ring and in which an inner iron extension portion extending radially outward of the hub is formed,
Wherein the inwardly extending portion extends toward the outer ring press-fitting portion and is close to the first extended portion of the outer-ring iron material in the axial direction. A wheel bearing including a hub connected to the wheel, an outer ring connected to the vehicle body, a rolling member interposed between the hub and the outer ring, and a sealing device mounted between an inner end of the outer ring and an inner end of the hub, In the fastening structure,
Wherein the sealing device includes an outer ring iron member press-fitted into an inner end of the outer ring and extending between an inner side of the hub and an inner side in a radial direction of the hub,
A protrusion protruding radially outward is formed in the drive shaft,
And the extended end of the outer-wheel iron member is fastened to the protruding portion of the drive shaft. 8. The method of claim 7,
Further comprising an inner ring connected to the hub,
The outer-
An outer ring press-in portion, one end of which is press-fitted into the inner circumferential surface of the outer ring between the outer ring and the inner ring;
A first extending portion that is bent and extends from the other end of the outer ring press-fitting portion toward the center axis of the hub; And
A second extension extending from the elongated first extension to an inner side and a radially inner side of the hub;
And a drive shaft coupling structure between the wheel bearing and the drive shaft. 9. The method of claim 8,
And the extended end of the second extension portion is caught by the protrusion of the drive shaft. 9. The method of claim 8,
And the inner diameter of the second extension portion is smaller than the outer diameter of the projection of the drive shaft. 9. The method of claim 8,
And a sealing member mounted on the second extending portion is disposed between the extended end of the second extending portion and the projecting portion of the drive shaft. 12. The method of claim 11,
Wherein the sealing member is formed with a lip protruding to contact with the projection of the driving shaft. 9. The method of claim 8,
And a through hole formed in the second extension portion is formed in a lower portion of the outer ring iron member. 9. The method of claim 8,
And a through hole formed in the lower portion of the outer ring iron member, the through hole being formed in the first extending portion and the second extending portion, respectively.
KR1020160004441A 2016-01-13 2016-01-13 Wheel bearing and jointing structure for wheel bearing and drive shaft KR101814703B1 (en)

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Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
KR101999694B1 (en) 2017-09-29 2019-07-12 현대위아(주) Wheel structure of vehicle
KR101977644B1 (en) 2017-09-29 2019-05-13 현대위아(주) Wheel structure of vehicle
KR102525228B1 (en) * 2018-12-14 2023-04-25 주식회사 일진글로벌 Wheel bearing assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006200708A (en) 2005-01-24 2006-08-03 Ntn Corp Bearing for wheel
KR100799647B1 (en) 2006-08-09 2008-01-30 주식회사 일진글로벌 Seal integrated with encoder for bearing
CN104040200A (en) * 2012-02-10 2014-09-10 内山工业株式会社 Cap for bearing device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006200708A (en) 2005-01-24 2006-08-03 Ntn Corp Bearing for wheel
KR100799647B1 (en) 2006-08-09 2008-01-30 주식회사 일진글로벌 Seal integrated with encoder for bearing
CN104040200A (en) * 2012-02-10 2014-09-10 内山工业株式会社 Cap for bearing device

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