KR101661855B1

KR101661855B1 - Ball joint

Info

Publication number: KR101661855B1
Application number: KR1020150070137A
Authority: KR
Inventors: 이관수
Original assignee: 주식회사 프라이맥스
Priority date: 2015-05-20
Filing date: 2015-05-20
Publication date: 2016-09-30

Abstract

According to the present invention, a ball joint is used for a steering apparatus and comprises: a ball stud having a ball; and a housing receiving the ball to support the ball stud through a pivot. The housing comprises: a bottom part; and an extended part extended from the bottom part to have an inner space receiving the ball. The extended part comprises a deformed part, a coupling part and a comparting part. The deformed part is deformed to allow the size of an opening to be reduced to prevent the ball from releasing to the outside after the ball is received in the inner space. The coupling part provides an area to be connected to a dust cover for preventing introduction of a foreign substance into the inner space. The comparting part is positioned between the deformed part and the coupling part to compart a space into the deformed part and the coupling part. The comparting part protrudes outside in a radial direction rather than the coupling part to prevent the dust cover from being separated from the coupling part. The ball joint has further superior durability.

Description

Ball joint

The present invention relates to a ball joint, and more particularly to a ball joint in which a ball of a ball stud pivots inside a ball housing.

The present invention relates to a ball joint, and more particularly, to a ball joint in which a ball of a ball stud pivots inside a ball seat.

Ball joints are applied to various industrial fields, such as steering and suspension of automobiles.

A conventional ball joint is composed of a ball stud, a ball seat, a housing, and a dust cover having a ball. The ball stud is composed of a ball, a stud member, a flange member, and a sealing seat, and the ball is fitted with a ball seat having a flange member at the lower end thereof.

When the ball seat is installed on the ball, the housing is mounted on the ball seat. The housing in which the ball seat is installed has a portion at the top of which the dust cover can be engaged.

When the ball seat is installed in the housing, install the dust cover in the ball stud and housing. When the dust cover is installed in the housing, the bottom of the dust cover is joined to the seating portion of the dust cover formed in the housing, and then the dust cover is tightened with a straining ring.

When the dust cover is attached to the ball stud, the ball stud member is attached to the sealing sheet formed at the lower end of the flange member by using the elastic force of the flexible sealing lip formed at the upper end of the dust cover.

When the dust cover is coupled to the housing, there is a problem that the dust cover easily separates from the housing due to the movement of the ball stud.

After the ball seat is mounted on the housing, an external force is applied to the upper portion of the housing to reduce the opening of the housing to prevent the ball and the ball seat from being separated. In this case, There arises a problem that deformation is caused to the portion where the dust cover can be joined.

Further, it is necessary to apply an appropriate surface pressure to the ball so that the ball can move smoothly in the ball sheet, and the lubricating oil to be injected into the ball needs to be evenly dispersed throughout the ball for durability of the ball joint.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a ball joint in which a dust cover is easily installed in a housing and is prevented from being separated from the housing, So that it is possible to prevent the deformation of the ball and to apply the surface pressure of an appropriate size to the ball, thereby providing a ball joint having better durability.

A ball joint according to an embodiment of the present invention is used in a steering apparatus and includes a ball stud having a ball and a housing that receives the ball and pivotally supports the ball stud, And an extension portion extending from the bottom portion so as to form an internal space for accommodating the ball, wherein the extension portion is formed so that the size of the opening is reduced so that the ball is received in the internal space, And a dust cover for preventing foreign matter from flowing into the internal space, wherein the dust cover includes a deformed portion deformed by the deformation portion, Wherein the dust cover is provided on a side surface of the dust cover, And is formed so as to protrude radially outward.

The thickness of the partition of the ball joint according to an embodiment of the present invention may be greater than the thickness of the coupling portion to prevent the dust cover from being detached from the coupling portion.

The partition of the ball joint according to an embodiment of the present invention may have an outer surface located radially outward of the outer surface of the coupling portion to prevent the dust cover from being detached from the coupling portion after the opening is reduced .

The partition of the ball joint according to an embodiment of the present invention may be formed so as to protrude radially outward from the deformed portion to induce deformation of the engaging portion when the opening is reduced.

The dust compartment of the ball joint according to an embodiment of the present invention may be formed so as to gradually protrude radially outward along the inserting direction of the dust cover so that the dust cover can be easily attached to the engaging portion, .

The compartment of the ball joint according to an embodiment of the present invention has a first compartment surface contacting the outer surface of the engaging portion at a first angle and a second compartment surface contacting the outer surface of the deformed portion at a second angle, The angle may be smaller than the second angle so that the dust cover is easily attached to the coupling portion and is prevented from departing after mounting.

The compartment of the ball joint according to an embodiment of the present invention has a first compartment surface contacting the outer surface of the engaging portion at a first angle and a second compartment surface contacting the outer surface of the deformed portion at a second angle, And the length of the partition surface is smaller than the length of the second partition surface so as to induce deformation of the coupling portion when the opening is reduced.

The partition of the ball joint according to an embodiment of the present invention includes an inner surface positioned radially outwardly of the inner surface of the coupling portion to induce deformation of the coupling portion when the opening is reduced due to deformation of the deformed portion .

The dividing portion of the ball joint according to an embodiment of the present invention may have an inner surface located radially outward of the inner surface of the deforming portion so as to alleviate the surface pressure against the ball pivoted in the inner space .

The ball joint according to an embodiment of the present invention may further include a ball seat having a receiving space for receiving the ball, wherein the ball seat includes a bottom portion and a bottom portion extending from the bottom portion to form the receiving space Wherein the side surface portion has an inner surface located radially outwardly of the inner surface so as to be separated into a first region that is an upper region and a second region that is a lower region that alleviates surface pressure acting on the ball pivoting in the accommodation space A second inclined portion having an inner surface located radially outwardly of the inner surface of the first region and a third inclined portion having an inner surface located radially outward of the inner surface of the second region .

The first recessed portion of the ball joint according to an embodiment of the present invention is formed so as to be embedded along the circumferential direction so that lubricating oil injected into the ball is uniformly dispersed in the circumferential direction of the ball, And the fitting portion is formed so as to be embedded along the height direction so that the lubricating oil supplied to the ball is uniformly dispersed in the height direction of the ball.

The second recessed portion and the third recessed portion of the ball joint according to an embodiment of the present invention are formed so as to be connected to the first recessed portion so that lubricating oil injected into the ball is uniformly dispersed throughout the ball can do.

The first penetration portion of the ball joint according to an embodiment of the present invention is formed so as to be embedded along the circumferential direction, and the second insert portion and the third insert portion are formed such that the lubricating oil injected into the ball is uniformly dispersed And are formed so as to be shifted from each other in the height direction.

The second fitting portion of the ball joint according to an embodiment of the present invention includes a first fitting portion and a second fitting portion which are continuous from the end where the ball of the first region is inserted to the first fitting portion to allow the lubricating oil, And the third inclined portion is continuously formed from the first inclined portion to the bottom portion so that the lubricating oil introduced into the first inclined portion flows into the bottom portion.

The side portion of the ball joint according to an embodiment of the present invention may further include a surface relieving portion having an inner surface located radially outwardly of the inner surface so as to alleviate the surface pressure acting on the ball pivoting in the accommodation space. can do.

According to the ball joint according to the present invention, the dust cover is easily attached to the housing and is prevented from being detached, and when the external force is applied to the upper part of the housing to reduce the opening of the housing, And a surface pressure of an appropriate size is applied to the ball, and the lubricating oil injected into the ball is evenly dispersed throughout the ball, thereby providing a ball joint having excellent durability.

1 is a schematic perspective view of a ball joint according to an embodiment of the present invention;
2 is a schematic exploded view of a ball joint according to an embodiment of the present invention;
3 is a schematic cross-sectional view of a ball joint in accordance with an embodiment of the present invention.
4 is a schematic cross-sectional view illustrating a housing of a ball joint according to an embodiment of the present invention;
5 is a schematic cross-sectional view illustrating a housing of a ball joint according to another embodiment of the present invention.
6 is a perspective view of a ball joint according to another embodiment of the present invention.
7 is a schematic perspective view showing a ball seat of a ball joint according to an embodiment of the present invention;
8 is a schematic sectional view showing a ball seat of a ball joint according to an embodiment of the present invention;

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

FIG. 1 is a schematic perspective view of a ball joint according to an embodiment of the present invention, FIG. 2 is a schematic exploded view of a ball joint according to an embodiment of the present invention, FIG. 3 is a perspective view of a ball joint according to an embodiment of the present invention, 4 is a schematic cross-sectional view illustrating a housing of a ball joint according to an embodiment of the present invention.

3, the radial direction may be a direction in which the ball stud 100 is radially fixed or reduced with respect to an axis on which the ball stud 100 is inserted, and the circumferential direction may be a direction in which the ball stud 100 is inserted, And the height direction may mean an axial direction in which the ball stud 100 is inserted, that is, an up-and-down direction.

1 to 4, a ball joint 10 according to an embodiment of the present invention is used in a steering apparatus and includes a ball stud 100 having a ball 110, And a housing 200 pivotally supporting the ball stud 100. The housing 200 includes a bottom portion 210 and an internal space S1 for receiving the ball 110 And an extension 220 formed to extend from the bottom 210 so that the ball 110 is received in the internal space S1 and then prevented from being separated from the outside. An engaging portion 223 for providing a region to which a deformation portion 221 deformed to reduce the size of the opening, a dust cover 300 for preventing foreign matter from entering the internal space S1, (221) and the engaging part (223) to define the deforming part (221) and the engaging part (223) And may include a partition 225.

The partition 225 may protrude radially outward from the coupling portion 223 to prevent the dust cover 300 from being detached from the coupling portion 223.

The ball stud 100 may include a ball 110 and the ball 110 may pivot in the inner space S1 of the housing 200. [

For example, the ball 110 and the stud that form the ball stud 100 may be integrally formed, or may be made of a metal. The shape and material of the ball stud 100 are not limited to those shown in the drawings and can be modified to suit the intention of a person skilled in the art.

The housing 200 may have the extension 220 extending from the bottom 210 and the bottom 210 so that an internal space S1 for receiving the ball 110 is formed. have.

For example, the bottom 210 and the extension 220 may be integrally formed, or may be made of a metal.

The extension part 220 may include the deforming part 221 deformed to reduce the size of the opening so that the ball 110 is received in the internal space S1 and then prevented from being separated from the outside.

The diameter d1 of the opening before deformation of the deformed portion 221 due to an external force may be equal to or larger than the diameter of the ball 110 so that the ball 110 is received in the inner space S1.

The size d1 of the opening may be reduced by an external force so as to prevent the ball 110 from being separated from the internal space S1 after being received in the internal space S1. Therefore, the reduced diameter d2 of the opening may be smaller than the diameter of the ball 110.

That is, the deformed portion 221 may be deformed to reduce the opening by an external force to prevent the ball 110 from being separated from the internal space S1.

The extending portion 220 may include the engaging portion 223 that provides a region to which the dust cover 300 is connected to prevent foreign matter from entering the internal space S1.

One end of the dust cover 300 may be attached to the engaging portion 223 and the other end of the dust cover 300 may be attached to the ball stud 100. Therefore, the dust cover 300 can prevent foreign matter from flowing into the internal space S1 from the outside by sealing the internal space S1.

For example, the dust cover 300 may have elasticity, and may be rubber or synthetic resin.

The extension part 220 may include the partition part 225 which is located between the deformed part 221 and the engaging part 223 and separates the deformed part 221 and the engaging part 223 can do.

After the dust cover 300 is mounted on the engaging portion 223 and the ball stud 100 is pivotally moved in the inner space S1 of the housing 200 by the use of the user And the dust cover 300 may be detached from the engaging part 223 due to the pivot movement of the ball stud 100.

The dust cover 300 protrudes radially outwardly from the engaging part 223 to prevent the dust cover 300 from being separated from the engaging part 223 by being caught by the separating part 225. [ .

For example, the partition 225 may be continuously protruded radially outwardly of the extension 220, or partially protruded radially outward of the extension 220 .

The thickness t2 of the partition 225 may be greater than the thickness t1 of the coupling portion 223 to prevent the dust cover 300 from being detached from the coupling portion 223.

That is, as shown in FIG. 4, since the thickness t2 of the partition 225 is larger than the thickness t1 of the engaging portion 223, the dust cover 300 has the partition 225 Can be prevented from departing from the engaging portion 223.

The dividing portion 225 may have a radius larger than the outer surface B of the engaging portion 223 to prevent the dust cover 300 from being separated from the engaging portion 223 after the opening is reduced by an external force, And an outer surface (A) located outside the direction.

The ball stud 100 pivots in the inner space S1 after the opening is reduced due to deformation of the deforming portion 221. [ The outer surface A of the partition 225 is deformed by the pivot movement of the ball stud 100 to prevent the dust cover 300 from being separated from the coupling portion 223, (B) of the coupling portion 223 even when the coupling portion 223 is deformed by an external force.

The partition 225 may protrude radially outward from the deformable portion 221 to induce deformation of the coupling portion 223 when the opening is reduced.

That is, the deformed portion 221 is deformed in a direction in which the opening is reduced by an external force so as to prevent the ball 110 from being separated from the internal space S1, There is a problem that it can be deformed.

When the engaging portion 223 is deformed, the dust cover 300 may be disengaged from the engaging portion 223, which may interfere with the pivot movement of the ball 110.

Therefore, since the partition 225 protrudes radially outwardly from the deformation portion 221, the deformation of the coupling portion 223 during the reduction of the opening due to the deformation of the deformation portion 221 .

5 (a) and 5 (b) are schematic sectional views showing a housing of a ball joint according to another embodiment of the present invention.

5 (a), the housing 500 of the ball joint 10 according to another embodiment of the present invention includes a bottom portion 510 and an internal space S1 for accommodating the ball 110, And the extension part 520 extends from the bottom part 510 so that the ball 110 is accommodated in the internal space S1 and then separated from the external part 520. [ (523) for providing a region to which a dust cover (300) for preventing foreign matter from flowing into the internal space (S1) is connected, And a partition 525 that is located between the deforming portion 521 and the engaging portion 523 and separates the deforming portion 521 and the engaging portion 523. [

The dust cover 300 is installed in the dust cover 300 so that the dust cover 300 can be easily attached to the coupling part 523 and the dust cover 300 can be separated from the dust cover 300. [ As shown in Fig.

That is, the partition 525 may be formed to gradually protrude radially outward toward the inserting direction of the dust cover 300, that is, the downward direction with reference to FIG. 5 (a).

Therefore, the dust cover 300 can be easily attached to the engaging portion 523 in the downward direction, and can be prevented from deviating in the upward direction.

5 (b), the housing 600 of the ball joint 10 according to another embodiment of the present invention includes a bottom portion 610 and an inner space (not shown) And an extension part 620 extending from the bottom part 610 so that the ball S1 is formed in the inner space S1 and the extension part 620 is formed so that the ball 110 is accommodated in the inner space S1, A deformation part 621 deformed so as to reduce the size of the opening so as to prevent the dust from being separated from the inner space S1 and a dust cover 300 for preventing foreign matter from entering the inner space S1, And a dividing portion 625 which is located between the deforming portion 621 and the engaging portion 623 and separates the deforming portion 621 and the engaging portion 623.

The partition 625 has a first partition surface 625a contacting the outer surface of the coupling portion 623 at a first angle? 1 and a first partition surface 625b contacting the outer surface of the deformation portion 621 at a first angle? The dust cover 300 may be provided with a second partition surface 625b contacting the dust cover 300 and the dust cover 300. The first angle? May be smaller than the angle [theta] 2.

The dust cover 300 may be easily attached to the engaging portion 623 along the second partition surface 625b in a downward direction and the dust cover 300 may be attached to the engaging portion 623 After being mounted, the deviation in the upward direction can be prevented by the first partition surface 625a.

The length of the first partition surface 625a may be smaller than the length of the second partition surface 625b to induce the deformation of the coupling portion 623 when the opening is reduced.

The length of the first partition surface 625a and the second partition surface 625b may be an inclined length in a direction in which the dust cover 300 is inserted.

In this case, the partition 625 can induce the deformation of the coupling portion 623 when the opening is reduced, and the dust cover 300 can be easily attached to the coupling portion 623 It can be implemented so as to prevent deviation after mounting.

6 (a) and 6 (b) are schematic cross-sectional views illustrating a housing of a ball joint according to another embodiment of the present invention.

6 (a), the housing 700 of the ball joint 10 according to another embodiment of the present invention includes a bottom portion 710 and an inner space S1 And the extension portion 720 extends from the bottom portion 710 so that the ball 110 is received in the inner space S1 and then is released to the outside A deformation portion 721 deformed so as to reduce the size of the opening so as to prevent dust from entering the inner space S1, an engaging portion 723 providing an area to which the dust cover 300 for preventing the entry of foreign matter into the inner space S1 is connected, And a partition 725 that is located between the deforming portion 721 and the engaging portion 723 and separates the deforming portion 721 and the engaging portion 723.

Here, the partition 725 is positioned radially outwardly of the inner surface of the engaging portion 723 to induce deformation of the engaging portion 723 when the opening is reduced due to deformation of the deforming portion 721 As shown in Fig.

The partition 725 may have an inner surface located radially outwardly of the inner surface of the deforming portion 721 so as to alleviate surface pressure against the ball 110 pivoted in the inner space S1 .

That is, the partition 725 may be located between the deforming portion 721 and the engaging portion 723 and may be embedded outside the radius eccentricity.

In order to prevent the ball 110 from being separated from the internal space S1, deformation of the deforming portion 721 is realized by an external force. In this case, deformation due to external force acts on the engaging portion 723 May be implemented by the partitioning part 725. In this case,

The shape of the partition 725 can alleviate the surface pressure acting on the ball 110 and thus the ball 110 can be more effectively pivoted in the internal space S1 .

For example, the partition 725 shown in FIG. 6A is formed in a rounded groove shape from the extended portion 720, but the present invention is not limited thereto and may be a shape having a 'V' And it is obvious that various modifications can be made to those skilled in the art.

For example, the partition 725 may be provided with an inner surface located radially outwardly of the inner surface of the coupling portion 723, but the present invention is not limited thereto, And an inner surface located radially outwardly of the inner surface of the engaging portion 723.

The thickness t4 of the partition 725 may be adjusted by adjusting the thickness of the coupling portion 723 so as to induce the deformation of the coupling portion 723 when the opening is reduced due to the deformation of the deformation portion 721 t3. < / RTI >

That is, an external force acting for deformation of the deforming portion 721 is transmitted to the dividing portion 725 through the deforming portion 721, and the thickness t4 of the dividing portion 725 is greater than the thickness 723, the deformation due to the external force may not be generated in the engaging portion 723. [

6 (b), the housing 800 of the ball joint 10 according to another embodiment of the present invention includes a bottom portion 810 and an inner space (not shown) And an extension part 820 extending from the bottom part 810 so that the ball S1 is formed in the inner space S1 and the extension part 820 is formed in a state in which the ball 110 is accommodated in the inner space S1, A deformation portion 821 deformed so as to reduce the size of the opening so as to prevent the deformation of the inner space S1 and a dust cover 300 preventing the introduction of foreign matter into the inner space S1, And a partition 825 which is located between the deforming portion 821 and the engaging portion 823 and separates the deforming portion 821 and the engaging portion 823.

The partition 825 is formed to protrude radially outwardly from the coupling portion 823 to prevent the dust cover 300 from being detached from the coupling portion 823, 821 may be provided with an inner surface located radially outwardly of the inner surface of the coupling portion 823 to induce deformation of the coupling portion 823 when the opening is reduced due to deformation of the coupling portion 823.

For example, in FIG. 6 (b), the inner surface and the outer surface of the partition 825 are shown to be curved. However, the present invention is not limited thereto. As shown in the foregoing description, It is obvious that it can be deformed.

FIG. 7 is a schematic perspective view illustrating a ball seat of a ball joint according to an embodiment of the present invention, and FIG. 8 is a schematic cross-sectional view illustrating a ball seat of a ball joint according to an embodiment of the present invention.

7 and 8, the ball joint 10 according to an embodiment of the present invention further includes a ball seat 400 having a receiving space S2 for receiving the ball 110 can do.

The ball seat 400 may include the accommodation space S2 for receiving the ball 110. After the ball 110 is received in the accommodation space S2, The ball seat 400 may be inserted into the internal space S1 of the housing 200. [

The ball seat 400 may include a bottom portion 410 and a side portion 420 extending from the bottom portion 410 to form the accommodation space S2.

For example, the bottom portion 410 and the side portion 420 may be integrally formed, and the material may be synthetic resin.

Here, the side portion 420 may be formed to relax the surface pressure applied to the ball 110 pivoting in the accommodation space S2 and to divide the first region a1, which is an upper portion, and the second region a2, (421) having an inner surface located radially outwardly of the first region (a1), a second depression (423) having an inner surface located radially outward of the inner surface of the first region (a1) And a third recessed portion 425 having an inner surface located radially outward of the inner surface of the region a2.

That is, the side portion 420 may include the first recessed portion 421, the second recessed portion 423, and the third recessed portion 425 to relieve the surface pressure acting on the ball 110 As a result, the ball 110 can efficiently pivot in the internal space S1.

The first recessed portion 421 may be formed in a circumferential direction of the side portion 420 so as to be divided into a first region a1 which is an upper portion of the side portion 420 and a second region a2 which is a lower portion of the side portion 420 And may have an inner surface located radially outwardly of the inner surface of the side portion 420.

That is, the surface in contact with the ball 110 may be the inner surface of the first area a1 and the second area a2, and the first indented part 421 may be in contact with the ball 110 So that the surface pressure acting on the balls 110 can be reduced.

For example, the first recessed portion 421 may be continuously formed along the circumferential direction of the side portion 420, or may be partially formed along the circumferential direction of the side portion 420.

For example, the first depressed portion 421 may be embedded in the 'U' shape from the inner surface of the side portion 420, or may be embedded in the 'U' and 'V' shapes.

That is, the shape of the first depressed portion 421 is not limited to the shape shown in the drawings, and may be variously modified according to the purpose of the person skilled in the art.

The second recessed portion 423 and the third recessed portion 425 are formed on the inner surface of the first region a1 and the inner surface of the first region a1 to alleviate the surface pressure acting on the ball 110 pivoting in the accommodation space S2. And an inner surface located radially outward of the inner surface of the second area a2.

For example, the second recessed portion 423 and the third recessed portion 425 are formed by being embedded in a 'C' shape from the inner surface of the first region a1 and the inner surface of the second region a2, respectively Or may be formed by being embedded in the 'U' and 'V' shapes.

That is, the shape of the second recessed portion 423 and the third recessed portion 425 is not limited to the shape shown in the drawings, and may be variously modified according to the intention of a person skilled in the art.

The second recessed portion 423 and the third recessed portion 425 are formed so as to be embedded along the height direction so that the lubricating oil supplied to the ball 110 is uniformly dispersed in the height direction of the ball 110 .

For example, the second recessed portion 423 and the third recessed portion 425 may be formed by being continuously embedded along the height direction of the first region a1 and the second region a2, respectively , Or partially along the height direction of the first area a1 and the second area a2.

Lubricating oil may be introduced into the ball 110 to effectively pivot the ball 110 in the internal space S1.

The first recessed portion 421 may be formed along the circumferential direction of the side portion 420 and the second recessed portion 423 and the second recessed portion 423 may be formed along the circumferential direction of the side portion 420 in order to uniformly disperse the lubricating oil throughout the ball 110. [ The third recessed portion 425 may be formed to be embedded along the height direction unlike the first recessed portion 421.

In this case, not only the surface pressure acting on the ball 110 can be relaxed, but also the pressure of the ball (110) can be reduced by the first, second and third recessed portions 421, 423, 110 may be dispersed evenly throughout the ball 110. [0054]

The second recessed portion 423 and the third recessed portion 425 are formed in the first recessed portion 421 and the second recessed portion 422 so that the lubricant supplied to the ball 110 is evenly dispersed throughout the ball 110. [ As shown in FIG.

That is, the lubricant introduced into the ball 110 can be moved along the first and second recessed portions 421 and 423 and the third recessed portion 425, As a result, the lubricating oil can be evenly dispersed throughout the ball 110.

The second recessed portion 423 and the third recessed portion 425 are formed such that the lubricating oil supplied to the ball 110 is uniformly dispersed throughout the ball 110 and the pivot movement of the ball 110 They may be formed to be offset from each other in the height direction so as to be more effective.

The second recessed portion 423 and the third recessed portion 425 are formed to be shifted from each other in the height direction so that a portion of the surface pressure applied to the ball 110 is more uniformly formed on the surface of the ball 110 And the lubricating oil introduced into the balls 110 may be evenly dispersed throughout the balls 110. [

7, the second recessed portion 423 may be formed by inserting the ball 110 into the first recessed portion 421 such that the lubricating oil introduced into the ball 110 from the outside flows into the first recessed portion 421, And the third recessed portion 425 may be formed by being inserted into the first recessed portion 421 from the end of the first recessed portion a1 to the first recessed portion 421, And may be continuously embedded from the first depressed portion 421 to the bottom portion 410 to be introduced into the bottom portion 410.

That is, the lubricant introduced from the outside into the ball 110 flows from the end of the second recessed portion 423 communicating with the outside and reaches the first recessed portion 421, The lubricating oil that has reached the first recessed portion 421 flows into the third recessed portion 425 and can reach the bottomed portion 410.

As a result, the lubricating oil injected from the outside can be uniformly dispersed throughout the balls 110 due to the first recessed portion 421, the second recessed portion 423, and the third recessed portion 425 , So that the durability of the ball joint 10 can be further secured.

7 and 8, the side surface portion 420 has an inner surface located radially outwardly of the inner surface so as to relax surface pressure acting on the ball 110 pivoting in the accommodation space S2 And a surface relieving portion 427 may be provided.

That is, the surface relaxation portion 427 may be embedded from the inner surface of at least one of the first region a1 and the second region a2.

The surface pressure relieving part 427 can alleviate the surface pressure acting on the ball 110 and disperse the lubricating oil supplied to the ball 110 in the ball 110 uniformly.

For example, the surface relieving portion 427 shown in FIGS. 7 and 8 may be formed in a circular shape, but the present invention is not limited thereto and may be variously modified according to the purpose of the person skilled in the art.

The contact area of the ball seat 400 contacting the ball 110 may be distributed between 60% and 85% of the inner surface area of the ball seat 400. The contact area of the ball seat 400 The second recessed portion 423, the third recessed portion 425 and the surface relief portion 427 may be formed on the ball seat 400 so as to implement the first recessed portion 421, the second recessed portion 423, the third recessed portion 425,

1 to 6, the ball seat 400 of the ball joint according to an embodiment of the present invention includes an upper caulking ball joint in which the ball 110 is received from the upper portion of the housing 200 The present invention is not limited thereto. For example, the ball seat 400 may be used for a ball joint that houses the ball 110 in a housing using a plug, though not shown in the drawings. And it is apparent from the standpoint of a person skilled in the art that the ball seat 400 can be used as far as the technical idea of the present invention is applied to ball joints of various structures.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be apparent to those skilled in the art that such modifications or variations are within the scope of the appended claims.

100: Ball Stud
110: ball
200: Housing
300: Dust cover
400: ball seat

Claims

In a ball joint used in a steering apparatus,
A ball stud having a ball; And
And a housing for receiving the ball and pivotally supporting the ball stud,
The housing includes:
And an extension portion extending from the bottom portion so as to form a bottom portion and an internal space for receiving the ball,
The extension
A deformation portion deformed to reduce the size of the opening so that the ball is received in the inner space and then prevented from being separated from the outside, and a dust cover for preventing a foreign matter from flowing into the internal space, And a separating portion located between the deforming portion and the engaging portion and defining the deforming portion and the engaging portion,
[0028]
The dust cover protruding radially outward from the coupling portion to prevent the dust cover from being detached from the coupling portion,
Wherein when the deformable portion is deformed such that the size of the opening is reduced, the ball joint is protruded radially outwardly from the deformable portion to prevent deformation of the deformable portion due to deformation of the deformable portion.

The method according to claim 1,
Wherein the thickness of the partition is greater than the thickness of the engagement portion to prevent the dust cover from being detached from the engagement portion.

The apparatus according to claim 1,
And an outer surface located radially outward of the outer surface of the engaging portion to prevent the dust cover from being detached from the engaging portion after the opening is reduced.

delete

The apparatus according to claim 1,
Wherein the dust cover is formed to gradually protrude radially outward along the inserting direction of the dust cover so that the dust cover is easily attached to the engaging portion and is prevented from being detached after mounting.

The method according to claim 1,
Wherein the partition has a first partition surface contacting the outer surface of the coupling portion at a first angle and a second partition surface contacting the outer surface of the deformed portion at a second angle,
Wherein the first angle is smaller than the second angle so that the dust cover is easily attached to the engaging portion and prevented from disengaging after mounting.

The method according to claim 1,
Wherein the partition has a first partition surface contacting the outer surface of the coupling portion at a first angle and a second partition surface contacting the outer surface of the deformed portion at a second angle,
Wherein the length of the first partition surface is smaller than the length of the second partition surface to induce unmodification of the engaging portion when the opening is reduced.

The apparatus according to claim 1,
And an inner surface located radially outwardly of the inner surface of the engaging portion to induce the non-deformation of the engaging portion when the opening is reduced due to deformation of the deforming portion.

8. The apparatus according to claim 7,
And an inner surface located radially outwardly of the inner surface of the deformable portion to relieve a surface pressure against the ball pivoted in the inner space.

The method according to claim 1,
And a ball seat having a receiving space for receiving the ball,
The ball seat includes:
And a side surface portion extending from the bottom surface portion to form the bottom surface portion and the accommodation space,
The side portion
A first depressed portion having an inner surface located radially outwardly of the inner surface so as to be divided into a first region which is an upper region and a second region which is a lower region and which relaxes the surface pressure acting on the ball pivoting in the accommodation space, And a third recessed portion having a second recessed portion having an inner surface located radially outwardly of the inner surface of the second region and an inner surface located radially outward of the inner surface of the second region.

11. The method of claim 10,
Wherein the first inclined portion is formed along the circumferential direction so that lubricating oil injected into the ball is uniformly dispersed in the circumferential direction of the ball,
Wherein the second recessed portion and the third recessed portion are formed along the height direction so that lubricating oil injected into the ball is uniformly dispersed in the height direction of the ball.

11. The method of claim 10,
Wherein the second recessed portion and the third recessed portion are formed so as to be connected to the first recessed portion so that lubricating oil injected into the ball is uniformly dispersed throughout the ball.

11. The method of claim 10,
Wherein the first inclined portion is formed along the circumferential direction,
Wherein the second recessed portion and the third recessed portion are formed to be shifted from each other in the height direction so that lubricating oil injected into the ball is uniformly dispersed throughout the ball.

11. The method of claim 10,
Wherein the second impregnated portion is continuously formed from an end of the first region into which the ball is inserted so that lubricating oil introduced into the ball from the outside flows into the first impregnated portion,
Wherein the third inclined portion is continuously formed from the first inclined portion to the bottom portion so that the lubricating oil introduced into the first inclined portion flows into the bottom portion.

11. The method of claim 10,
Wherein the side portion further comprises a surface relieving portion having an inner surface positioned radially outwardly of the inner surface so as to alleviate the surface pressure acting on the ball pivoting in the accommodating space.