WO2018066795A1

WO2018066795A1 - Knuckle and wheel bearing assembly

Info

Publication number: WO2018066795A1
Application number: PCT/KR2017/008110
Authority: WO
Inventors: 송재명; 금동호; 이병용
Original assignee: 주식회사 일진글로벌
Priority date: 2016-10-07
Filing date: 2017-07-27
Publication date: 2018-04-12

Abstract

A knuckle and wheel bearing assembly is disclosed. A knuckle and wheel bearing assembly has: a wheel bearing coupled to a wheel so as to integrally rotate; and a knuckle having the wheel bearing inserted thereto and for supporting the wheel bearing. A first assembly groove is formed on the inner peripheral side of the knuckle. A second assembly groove is formed on the outer peripheral side of an outer wheel of the wheel bearing. The first assembly groove and second assembly groove mate and thus an insertion hole is formed. An assembly bolt is inserted to the insertion hole and thus the knuckle and wheel bearing are mutually coupled. A pressure reduction hole is formed on the second assembly groove such that the inner peripheral side of the outer wheel and the second assembly groove communicate.

Description

Knuckle and Wheel Bearing Assemblies

The present invention relates to knuckle and wheel bearing assemblies, and more particularly to knuckle and wheel bearing assemblies in which the outer rings of the knuckle and wheel bearing are assembled.

In general, a bearing is a device disposed between a rotating element and a non-rotating element to facilitate the rotation of the rotating element. To date, various types of bearings are used in the art, for example, roller bearings, tapered roller bearings, needle bearings, ball bearings, and the like.

Wheel bearings used in vehicles are one such type of bearing. The wheel bearing serves to mount the wheel on a vehicle body or knuckle that does not rotate so that the rotating element wheel (wheel) can smoothly rotate without generating friction loss as much as possible.

The wheel bearing includes a wheel hub that is integrally rotated to the wheel, an inner ring that is integrally coupled to the wheel hub, an outer ring that supports the wheel hub and the inner ring in an axial direction, between the outer ring and the wheel hub, and between the outer ring And a rolling element disposed between the inner ring and the inner ring so as to smooth the relative rotation.

The rolling element is disposed in a bearing space formed between the outer ring and the inner ring and between the outer ring and the wheel hub, and the bearing space is appropriately filled with a lubricant such as grease for smooth rotation and revolution of the rolling element.

As an example of the wheel bearing configured as described above, the driving wheel bearing assembly in which the constant velocity joint is fastened to the wheel bearing, which is an example of the driving member that receives the rotational power of the engine, transmits the engine power to the wheel through the constant velocity joint and the wheel bearing. do.

The outer ring of the conventional wheel bearing is fastened to the knuckle and supported by the knuckle. As the outer ring and knuckle fastening method, the fastening flange and the knuckle formed on the outer ring are fastened with a plurality of fastening bolts to prevent axial separation between the outer ring and the knuckle, or the snap ring is fastened to the outer ring while the outer ring is pressed into the knuckle. Prevents axial separation of the outer ring and knuckles.

However, in the above-described conventional wheel bearing assembly structure, it is necessary to improve the fastening assemblability and detachment workability between the knuckle and the wheel bearing, and the overall weight is required to be reduced.

In the case of assembling the wheel bearing, after the lubricant is filled in the bearing space, the seal member is forcibly pressed into the wheel bearing through the inlet of the bearing space and assembled to the wheel bearing. In this case, if the internal pressure of the bearing space rises, it is difficult to relieve the pressure and cause damage to the seal member.

In addition, an increase in the internal pressure of the wheel bearing may increase the rotational resistance torque (drag torque) of the entire wheel bearing, resulting in deterioration of the wheel bearing's performance, premature wear, and deterioration in durability.

In addition, when the wheel bearing is operated, fatigue peeling of the raceway surface may occur due to a temperature increase, thereby reducing the reliability of the wheel bearing.

The matters described in this Background section are intended to enhance the understanding of the background of the invention, and may include matters not previously known to those of ordinary skill in the art.

The present invention has been invented to solve the above-described problems, the present invention, by assembling the knuckle and the wheel bearing and the operation of the wheel bearing to suppress the increase in the internal pressure of the wheel bearing to ensure reliability, the assembly of the outer ring and the knuckle Provided is a knuckle and wheel bearing assembly that reliably prevents axial separation of the outer ring and the knuckle while improving performance.

A knuckle and wheel bearing assembly according to an embodiment of the present invention includes a wheel bearing that is integrally rotated with a wheel and a knuckle that supports the wheel bearing. The wheel bearing may include a wheel hub that is integrally rotated with the wheel, an inner ring that is fitted to the wheel hub to be integrally rotated with the wheel hub, and is located radially outward of the wheel hub and the inner ring. And an outer ring rotatably supporting the wheel hub and the inner ring, and a rolling element disposed between the outer ring and the wheel hub and between the outer ring and the inner ring. A first assembly groove is formed on an inner circumferential surface of the knuckle, and a second assembly groove is formed on an outer circumferential surface of the outer ring. The first assembly groove and the second assembly groove are joined to form an insertion hole. An assembly bolt is inserted into the insertion hole to fasten the knuckle and the wheel bearing to each other. A pressure reducing hole is formed in the second assembly groove so that the inner circumferential surface of the outer ring and the second assembly groove communicate with each other.

In an embodiment, the pressure reducing hole spreads the pressure into a space formed by the second assembly groove when the internal pressure of the wheel bearing is increased.

In one embodiment, the outer ring includes a cylindrical portion having both sides facing each other in the axial direction, the second assembling groove is recessed in an arc shape toward the outer peripheral surface of the cylindrical portion in a radially inward direction and in the circumferential direction It is formed continuously.

In one embodiment, the outer ring is formed with a forced indentation to be forced to the inner circumferential surface of the knuckle including a cylindrical portion having an inner circumferential surface.

In one embodiment, the forced indentation portion is disposed on both sides of the axial direction outer side, or the axial direction inner side, or the axial direction inner side and the axial direction outer side with respect to the second assembly groove.

In one embodiment, the wheel hub includes a cylindrical portion, and the inner ring includes a stepped indentation that is forcibly pressed into a stepped portion formed in the wheel hub.

In one embodiment, the wheel hub has an orbital forming portion formed in the axial direction from the axially inner end surface of the step portion corresponding to the inner ring.

In one embodiment, the knuckle comprises a cylindrical portion and a knuckle arm extending radially outward from the cylindrical portion.

In one embodiment, the first assembling groove is recessed in an arc shape toward the outer circumferential surface of the cylindrical portion of the knuckle in a radial direction outwardly and is formed continuously in the circumferential direction.

In one embodiment, the assembly boss is formed on the outer peripheral surface of the cylindrical portion of the knuckle to protrude radially outward.

In one embodiment, the assembly boss is formed with a flat portion on one side corresponding to the head portion of the assembly bolt and the other side corresponding to the cap nut fastened to the assembly bolt, respectively.

In one embodiment, the flat portion is in close contact with the inner surface of the head portion and the inner surface of the cap nut, respectively.

In one embodiment, the end of the assembly bolt is formed with a coupling means for fixing the cap nut.

In one embodiment, the coupling means is formed of a screw.

According to the knuckle and wheel bearing assembly according to an embodiment of the present invention, during the assembly of the knuckle and the wheel bearing and the operation of the wheel bearing to suppress the increase in the internal pressure of the wheel bearing to ensure reliability, the assembly of the outer ring and knuckle It is possible to reliably prevent the axial separation of the outer ring and the knuckle while improving.

In addition, by securing a space between the outer ring and the knuckle through a pressure reducing hole formed in the outer ring and communicating with the second assembly groove, the space formed by the second assembly groove through the pressure reducing hole when the internal pressure of the wheel bearing rises. Pressure can be diffused to eliminate the pressure rise. Therefore, it is possible to prevent an increase in the rotational resistance torque of the wheel bearing, thereby preventing performance degradation, premature wear and durability deterioration of the wheel bearing.

In addition, during operation of the wheel bearing it is possible to prevent the fatigue peeling of the raceway surface that may be generated by the temperature rise.

In addition, by forming flat portions on both sides of the assembling boss of the knuckle corresponding to both ends of the assembling bolts, and bringing the head portion and the cap nut of the assembling bolt into surface contact with each other, the sealing performance is improved to prevent external moisture and foreign substances. Penetration can be prevented beforehand.

In addition, since the outer ring and the knuckle of the wheel bearing are fastened with the assembling bolts, the axial separation between the outer ring and the knuckle can be reliably prevented, and the assembly productivity, maintainability and maintenance can be improved. In addition, through the forced pressure input between the outer ring and the knuckle, the preload adjustment of the wheel bearing can be made easy and convenient.

In addition, since there is no need to form a separate flange for fastening the outer ring and the knuckle on the outer ring, weight and cost can be reduced.

1 is a cross-sectional view of a knuckle and wheel bearing assembly in accordance with one embodiment of the present invention.

2 is a perspective view of the outer ring according to an embodiment of the present invention.

3 is a perspective view showing that the knuckle and the wheel bearing are fastened with assembly bolts according to an embodiment of the present invention.

4 is a view showing that the assembly bolt is fastened to the assembly boss of the knuckle in the knuckle and wheel bearing assembly according to an embodiment of the present invention.

5 is a cross-sectional view showing that the assembly bolt is fastened to the knuckle according to an embodiment of the present invention.

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

Configurations shown in the embodiments and drawings described herein are only one embodiment of the present invention and do not represent all of the technical idea of the present invention, and various equivalents that may be substituted for them at the time of filing the present application and It should be understood that there may be variations.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

Since the size and thickness of each component in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to those illustrated in the drawings, and may be enlarged in order to clearly express various parts and regions. have.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless specifically stated otherwise.

The terms " unit ", " means ", " part ", " member "

"Axial direction" as described herein means the direction along the axis of rotation of the wheel bearing. "Axial outward" means the direction toward the wheel coupled to the wheel bearing along the axis of rotation, and "axially inward" means the opposite direction of the axial outward.

1 is a cross-sectional view of a knuckle and wheel bearing assembly according to an embodiment of the present invention, FIG. 2 is a perspective view of an outer ring according to an embodiment of the present invention, and FIG. 3 is a knuckle and wheel according to an embodiment of the present invention. 4 is a perspective view showing that the bearing is fastened with the assembly bolt, Figure 4 is a view showing that the assembly bolt is fastened to the assembly boss of the knuckle in the knuckle and wheel bearing assembly according to an embodiment of the present invention, Figure 5 In accordance with one embodiment of the invention is a cross-sectional view showing that the assembly bolt is fastened to the knuckle.

1 to 5, a knuckle and wheel bearing assembly according to an embodiment of the present invention includes a knuckle for supporting the wheel bearing 10 and the wheel bearing 10 by inserting the wheel bearing 10 in the axial direction of the rotation shaft R. 100).

The wheel bearing 10 may include a wheel hub 20, an inner ring 30, an outer ring 40, and a rolling element 50.

The wheel hub 20 is engaged with the wheel to rotate integrally with the wheel to rotatably support the wheel (not shown).

The wheel hub 20 includes a cylindrical portion 22 having opposite sides facing each other along the axial direction, and a flange which is integrally formed to extend radially outward from the cylindrical portion 22 to be integrally rotated with the wheel. And (24).

The inner ring 30 is axially fitted to the outer circumferential surface of the wheel hub 20 in the radially outward direction to be integrally rotated with the wheel hub 20.

The inner ring 30 may include a cylindrical portion 32 having both sides facing each other along the axial direction and having an outer circumferential surface.

The inner ring 30 may include a stepped indentation part 34 that is forcibly pressed into the stepped portion 26 formed on the outer circumferential surface of the cylindrical portion 22 of the wheel hub 20 on its inner circumferential surface.

Accordingly, when the inner ring 30 is press-fitted into the stepped portion 26 formed in the cylindrical portion 22 of the wheel hub 20, the stepped press-in portion 34 of the inner ring 30 is formed by the stepped portion 26. It is pressed into the outer circumferential surface.

In the wheel hub 20, an orbital forming part 28 may be formed in the axial direction from the inner end surface of the step portion 26 corresponding to the inner ring 30.

The orbital forming portion 28 is formed to surround a portion of the cylindrical portion 32 of the inner ring 30 and the cylindrical portion 22 of the wheel hub 20, the axial direction of the inner ring 30 and the wheel hub 20 Prevents separation and imparts a stable preload to the wheel bearing 10.

Wheel hub track surfaces and inner ring track surfaces are formed on a portion of the outer circumferential surface of the cylindrical portion 22 of the wheel hub 20 and a portion of the outer circumferential surface of the cylindrical portion 32 of the inner ring 30, respectively. Accordingly, the rolling element 50 may be mounted on the wheel hub track surface and the inner ring track surface, respectively, to be rotatably supported.

In the present embodiment, the outer ring 40 is located in the radially outer side of the wheel hub 20 and the inner ring 30, so as to rotate the wheel hub 20 and the inner ring 30 via the rolling element 50. I support it. This outer ring 40 will be described in more detail below.

The rolling element 50 is formed between the outer ring 40 and the wheel hub 20 and between the outer ring 40 and the inner ring 30 such that the wheel hub 20 and the inner ring 30 can rotate relative to the outer ring 40. It is arranged in the bearing space 60 formed between.

In the embodiment of the present invention, the rolling element 50 is a ball-shaped rolling element, a plurality of rolling elements 50 are arranged to form a row in the circumferential direction, and are spaced apart from each other in the axial direction. The shape and arrangement of the rolling element is not limited thereto, and an adiabatic rolling element may be used, and a rolling element having a shape other than a ball may be used.

In addition, foreign matters such as dust and moisture penetrate into the bearing space 60 in which the rolling element 50 is disposed between the wheel hub 20 and the outer ring 40 and between the inner ring 30 and the outer ring 40. In order to prevent the sealing member 70 may be mounted respectively.

In this embodiment, the knuckle 100 may include a cylindrical portion 102 and a knuckle arm 104 extending radially outward from the cylindrical portion 102.

The first assembly groove 106 is formed on the inner circumferential surface of the knuckle 100. The first assembling groove 106 may be formed in an arcuate shape in a radially outward direction on the inner circumferential surface of the cylindrical portion 102 of the knuckle 100, and may be continuously formed in the circumferential direction. The arc shape of the first assembling groove 106 may be a shape larger than the semi-circle shape toward the outer side in the radial direction. The first assembly groove 106 may be positioned in a direction perpendicular to the rotation axis (R).

As shown in Figs. 1 and 2, the outer ring 40 may include a cylindrical portion 42 having both sides facing each other in the axial direction, and the cylindrical portion 42 may be a cylinder of the knuckle 100. The outer ring 40 may be fixed and mounted to the knuckle 100 by being pressed into the part 102.

When the assembly of the wheel hub 20 and the inner ring 30 is inserted into the cylindrical portion 42 of the outer ring 40 and assembled with the outer ring 40, the inner circumferential surface of the cylindrical portion 42 of the outer ring 40 and the wheel hub ( A predetermined bearing space 60 is formed between the outer circumferential surface of the cylindrical portion 22 of 20 and between the inner circumferential surface of the cylindrical portion 42 of the outer ring 40 and the outer circumferential surface of the cylindrical portion 32 of the inner ring 30. .

As the rolling element 50 is inserted into the bearing space 60, the assembly of the wheel hub 20 and the inner ring 30 may be supported to rotate relative to the outer ring 40 via the rolling element 50. .

A second assembly groove 44 is formed on the outer circumferential surface of the outer ring 40 to mate with the first assembly groove 106 formed on the inner circumferential surface of the knuckle 100 to form the insertion hole 80. The second assembly groove 44 may be recessed in an arc shape toward the outer circumferential surface of the cylindrical portion 42 of the outer ring 40 in a radially inward direction, and may be continuously formed in the circumferential direction. The arc shape of the second assembling groove 44 may be a shape smaller than the semi-circle shape toward the inner side in the radial direction. The second assembly groove 44 may be positioned in a direction perpendicular to the rotation axis R.

The insertion hole 80 may be formed between the inner circumferential surface of the cylindrical portion 102 of the knuckle 100 and the outer circumferential surface of the cylindrical portion 42 of the outer ring 40. The cross-sectional shape of the insertion hole 80 may be circular to correspond to the cross-sectional shape of the assembly bolt 110. The cross-sectional shape of the first assembly groove 106 and the cross-sectional shape of the second assembly groove 44 may have complementary shapes such that they form a cross-sectional shape of the insertion hole 80. Accordingly, in the state where the outer ring 40 is press-fitted into the cylindrical portion 102 of the knuckle 100, the first assembling groove 106 and the second assembling groove 44 are aligned with each other in an orientation perpendicular to the axis of rotation. The cross-sectional shape of the first assembling groove 106 and the cross-sectional shape of the second assembling groove 44 may be matched in shape, such that the insertion hole 80 may be formed.

Accordingly, the assembly bolt is inserted into the insertion hole 80 formed by joining the first assembly groove 106 and the second assembly groove 44 in a state in which the outer ring 40 is pressed into the cylindrical portion 102 of the knuckle 100. By inserting 110, the knuckle 100 and the wheel bearing 10 are fastened to each other.

In one embodiment, the pressure reducing hole 46 may be formed in the second assembly groove 44 so that the inner circumferential surface of the outer ring 40 and the second assembly groove 44 communicate with each other. The pressure reduction hole 46 may be formed through the cylindrical portion 42 in which the second assembly groove 44 is located. The pressure reduction hole 46 may connect the inner circumferential surface of the outer ring 40 and the second assembly groove 44. In this embodiment, one pressure reducing hole 46 is formed in the second assembling groove 44. However, the number of pressure reduction holes is not limited thereto, and a plurality of pressure reduction holes may be formed in the second assembly groove 44 so that the inner circumferential surface of the outer ring 40 and the second assembly groove 44 communicate with each other.

When the internal pressure of the wheel bearing 10 is increased during the assembly of the wheel bearing 10 or the rotation of the wheel bearing 10, the pressure reducing hole 46 receives the lubricant filled in the bearing space 60 from the second assembly groove. By flowing to the space formed by 44, the internal pressure of the wheel bearing 10 can be prevented from rising.

In addition, the pressure reducing hole 46 and the second assembling groove 44 are increased in the internal pressure of the bearing space 60 even when the sealing member 70 is forcibly pressed through the inlet of the bearing space 60. As a result, the external leakage of the lubricant filled therein can be prevented.

The outer ring 40 may be provided with a forced indentation 48 that is forcibly pressed into the inner circumferential surface of the cylindrical portion 102 of the knuckle 100. As shown in FIG. 2, the forced indentation unit 48 may be forced into the inner circumferential surface of the knuckle 100 so as to be forced in the axially inner side and the axially outer side with respect to the second assembling groove 44. The forced indentation portion 48 is formed to have the same outer circumferential diameter.

In this embodiment, the forced indentation part 48 is arrange | positioned in the axial direction inner side and the axial direction outer side with respect to the 2nd assembly groove 44 in the cylindrical part 42 of the outer ring 40. As shown in FIG. The position of the forced indentation portion 48 is not limited to both sides of the axially inner side and the axially outer side, and the forced indentation portion 48 is the second assembly groove 44 in the cylindrical portion 42 of the outer ring 40. It may be disposed on the outer side in the axial direction or the axial direction on the basis of.

In addition, in the present embodiment, the cylindrical portion 102 of the knuckle 100 may be integrally formed with the cylindrical portion 102, the assembly boss 108 formed to protrude radially outward on the outer peripheral surface.

The assembly boss 108 of the knuckle 100 may be formed with an assembly hole 108a penetrating the assembly boss 108, and the assembly hole 108a may be in communication with the first assembly groove 106. 3 and 5, the assembling hole 108a may extend the assembling boss 108 through the inner circumferential surface of the cylindrical portion 102 in an orientation perpendicular to the rotation axis, and the inner circumferential surface of the cylindrical portion 102. A portion of the assembling hole 108a positioned in the first forming groove 106 may be formed.

In this embodiment, one assembly boss 108 is formed in the knuckle 100, and one assembly bolt 110 is also used, but the number of assembly bosses and the assembly bolts is not limited thereto. A plurality of assembly bosses 108 may be formed in the knuckle 100, and one or more assembly bolts 110 may be used.

Accordingly, the assembling bolt 110 through the assembling holes 108a of the assembling boss 108 and the first assembling grooves 44 and the second assembling grooves 106 joined together to form the insertion holes 80. Is inserted between the outer ring 40 and the knuckle 100, it is possible to fasten the knuckle 100 and the wheel bearing 10 to each other.

4 and 5, the assembling boss 108 corresponds to one side corresponding to the head portion 110a of the assembling bolt 110 and the cap nut 120 fastened to the assembling bolt 110. Flat portions 109 may be formed on the other side, respectively.

By bringing the flat portion 109 and the inner surface of the head portion 110a and the inner surface of the cap nut 120 into close contact, the seal performance is improved and external moisture and foreign matter penetrate into the interior of the wheel bearing 10. It can prevent it beforehand.

In addition, the assembly bolt 110, as shown in Figure 5, the coupling means 110b for fixing the cap nut 120 may be formed at the end thereof.

Coupling means 110b may be formed of a screw. In this case, the assembling bolt 110 connects the assembling hole 108a of the assembling boss 108 with the first assembling groove 106 and the second assembling groove 44 which are joined to each other to form the insertion hole 80. After passing, it may be screwed onto a portion of knuckle 100 through cap nut 120 at the opposite side of assembly boss 108. Coupling means (110b), in addition to the screw fastening method may be configured in a variety of ways, such as forced pressing for fixing the assembly bolt 110.

According to the knuckle and wheel bearing assembly according to an embodiment configured as described above, the internal pressure rise of the wheel bearing 10 during assembly of the knuckle 100 and the wheel bearing 10 and operation of the wheel bearing 10. Can be suppressed to ensure reliability.

In addition, the axial separation of the outer ring 40 and the knuckle 100 can be reliably prevented while improving the assemblability of the outer ring 40 and the knuckle 100.

In addition, by securing a space between the outer ring 40 and the knuckle 100 through the pressure reducing hole 46 in communication with the second assembly groove 44 formed in the outer ring 40, the interior of the wheel bearing 10 When the pressure rises, the pressure is diffused through the pressure reducing hole 46 to the space formed between the second assembly groove 44 and the inner peripheral surface of the cylindrical portion 102 of the knuckle 100 to eliminate the pressure rise. . Therefore, it is possible to prevent an increase in the rotational resistance torque, thereby preventing performance degradation, premature wear and durability degradation of the wheel bearing.

In addition, during operation of the wheel bearing 10 it is possible to prevent the fatigue peeling of the raceway surface that may be generated by the temperature rise.

Further, flat portions 109 are formed on both sides of the assembly boss 108 of the knuckle 100 corresponding to both ends of the assembly bolt 110, and the head portions of the assembly bolt 110 are formed through the flat portions 109. By making the 110a and the cap nut 120 in surface contact with the flat portion 109, the sealing performance may be improved to prevent external penetration of moisture and foreign matter.

In addition, the outer ring 40 and the knuckle 100 are fastened by the assembly bolt 100, so that the axial separation between the outer ring 40 and the knuckle 100 can be reliably prevented, and the assembly productivity, maintainability and maintenance This can be improved.

In addition, through the forced pressure input and the pressure reduction hole 46 between the outer ring 40 and the knuckle 100 can be easily and convenient to adjust the preload of the wheel bearing.

In addition, since the outer ring 40 does not need to form a separate flange for fastening the outer ring 40 and the knuckle 100, weight and cost can be reduced.

The present invention has been described above by means of limited embodiments and drawings, but the present invention is not limited thereto, and the technical idea of the present invention and claims are described below by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents.

Claims

A knuckle and wheel bearing assembly comprising a wheel bearing integrally rotated integrally with a wheel, and a knuckle for sandwiching and supporting the wheel bearing,

The wheel bearing,

A wheel hub fastened integrally with the wheel,

An inner ring fitted to the wheel hub and rotatably coupled to the wheel hub;

An outer ring positioned radially outward of the wheel hub and the inner ring to rotatably support the wheel hub and the inner ring;

A rolling element disposed between the outer ring and the wheel hub and between the outer ring and the inner ring,

A first assembly groove is formed on the inner circumferential surface of the knuckle, and a second assembly groove is formed on the outer circumferential surface of the outer ring.

The first assembly groove and the second assembly groove are joined to form an insertion hole,

An assembly bolt is inserted into the insertion hole to fasten the knuckle and the wheel bearing to each other.

A pressure reducing hole is formed in the second assembly groove so that the inner circumferential surface of the outer ring and the second assembly groove communicate with each other.

Knuckle and wheel bearing assemblies.
The method of claim 1,

The pressure reducing hole, when the internal pressure of the wheel bearing is increased, to spread the pressure to the space formed by the second assembly groove,

Knuckle and wheel bearing assemblies.
The method of claim 1,

The outer ring includes a cylindrical portion that is open at both sides facing each other in the axial direction,

The second assembly groove is recessed in an arc shape toward the radially inner side on the outer circumferential surface of the cylindrical portion is formed continuously in the circumferential direction,

Knuckle and wheel bearing assemblies.
The method of claim 1,

The outer ring is provided with a forced indentation to be forced to the inner circumferential surface of the knuckle including a cylindrical portion having an inner circumferential surface

Knuckle and wheel bearing assemblies.
The method of claim 4, wherein

The forced indentation portion is disposed on both sides of the axial direction outer side, or the axial direction inner side, or the axial direction inner side and the axial direction outer side with respect to the second assembly groove,

Knuckle and wheel bearing assemblies.
The method of claim 1,

The wheel hub comprises a cylindrical portion;

The inner ring includes a step indentation that is forcibly pressed into the stepped portion formed in the wheel hub,

Knuckle and wheel bearing assemblies.
The method of claim 6,

The wheel hub is formed with an orbital forming portion in the axial direction from the axially inner end surface of the step portion corresponding to the inner ring,

Knuckle and wheel bearing assemblies.
The method of claim 1,

The knuckle includes a cylindrical portion and a knuckle arm extending radially outward from the cylindrical portion,

Knuckle and wheel bearing assemblies.
The method of claim 8,

The first assembly groove is recessed in an arc shape toward the outer circumferential direction in the radial direction on the inner peripheral surface of the cylindrical portion of the knuckle, is formed continuously in the circumferential direction,

Knuckle and wheel bearing assemblies.
The method of claim 8,

The outer circumferential surface of the cylindrical portion of the knuckle is formed so that the assembly boss protrudes radially outward,

Knuckle and wheel bearing assemblies.
The method of claim 10,

The assembly boss is provided with flat portions on one side corresponding to the head portion of the assembly bolt and the other side corresponding to the cap nut fastened to the assembly bolt, respectively.

Knuckle and wheel bearing assemblies.
The method of claim 11,

The flat portion is in close contact with the inner surface of the head and the inner surface of the cap nut,

Knuckle and wheel bearing assemblies.
The method of claim 11,

End of the assembly bolt is formed with a coupling means for fixing the cap nut,

Knuckle and wheel bearing assemblies.
The method of claim 13,

The coupling means is formed of a screw,

Knuckle and wheel bearing assemblies.