KR101226008B1 - Lock nut - Google Patents

Abstract

A lock nut is disclosed. Lock nut according to an embodiment of the present invention comprises a main nut having a first main screw thread and a second main screw thread spaced apart from each other in a direction parallel to the central axis; And a locking part positioned at one side of the main nut to extend a distance between the first main screw thread and the second main screw thread.

Description

Lock nut

The present invention relates to a lock nut.

In general, in places where vibrations are severe, such as ships, when the bolts / nuts are used to combine various structures, the nuts are often loosened due to vibration, so they are used lock nuts that can fundamentally solve them.

A representative example of the lock nut is that two nuts are repeatedly fastened to a bolt, or a hole is formed in the bolt to connect a split pin to prevent loosening of the nut. Although one nut is used, there is a problem that the locking force is lowered when the tightening is repeated several times.

On the other hand, as another example of the lock nut, there is a lock nut fixed in such a manner that the gap between the axial threads of the lock nut provided on the shaft is narrowed and finally tightened.

When the lock nut is installed in contact with a component installed on the shaft, the final nut is spaced apart from the adjacently installed components as the axial thread spacing of the lock nut is narrowed. As such, when a clearance occurs between the lock nut and the adjacent parts, vibration and noise are generated when the shaft rotates, and fatigue damage of the adjacent parts occurs.

One embodiment of the present invention is to provide a lock nut in which no play occurs between adjacent parts installed on the shaft.

According to an aspect of the present invention, a main nut having a first main screw thread and a second main screw thread spaced apart from each other in a direction parallel to the central axis; And a locking part located at one side of the main nut to extend a gap between the first main screw thread and the second main screw thread, wherein the main nut has a first body having the first main screw thread formed on an inner side surface thereof. ; And a second body having the second main screw thread formed on an inner surface thereof, wherein the first body and the second body are connected to each other by a connecting portion at an outer circumference of the main nut, and the locking portion is connected to the first body and the A bolt coupling hole formed in a straight line parallel to the central axis in a second body; And a locking bolt coupled to the bolt coupling hole and having a bolt head fixed at one side of the second body, wherein the bolt coupling hole has a threaded portion formed at one side of the first body, and the locking bolt has the first bolt. 1 a corresponding thread is formed at a position corresponding to the thread formed on one side of the body, and a stopper is formed on one side of the main nut to prevent retraction of the locking bolt, and the stopper has a smaller diameter than the locking bolt head. A lock nut is provided in which topping holes are formed.

According to another aspect of the invention, the main nut having a first main screw thread and a second main screw thread spaced apart from each other in a direction parallel to the central axis; And a locking part located at one side of the main nut to extend a gap between the first main screw thread and the second main screw thread, wherein the main nut has a first body having the first main screw thread formed on an inner side surface thereof. ; And a second body having the second main screw thread formed on an inner surface thereof, wherein the first body and the second body are connected to each other by a connecting portion at an outer circumference of the main nut, and the locking portion is parallel to the central axis. A bolt coupling hole formed through the second body; And a locking bolt coupled to the bolt coupling hole so that one end may press the side surface of the first body, wherein the bolt coupling hole has a threaded portion formed at one side of the second body, and the locking bolt has the first bolt. A corresponding thread is formed at a position corresponding to the thread formed on one side of the body, and a stopper is formed on one side of the main nut to prevent retraction of the locking bolt, and the stopper has a smaller diameter than the bolt head. A lock nut is provided in which topping holes are formed.
According to another aspect of the invention, the main nut having a first main screw thread and a second main screw thread spaced apart from each other in a direction parallel to the central axis; And a locking part located at one side of the main nut to extend a gap between the first main screw thread and the second main screw thread, wherein the main nut has a first body having the first main screw thread formed on an inner side surface thereof. ; And a second body having the second main screw thread formed on an inner surface thereof, wherein the first body and the second body are connected to each other by a connecting portion at an outer circumference of the main nut, and the locking portion has an outer surface of the main nut. A bolt coupling hole formed in the connection part in a direction of the center of the main nut from one side of the first body and one side of the second body facing the first body; And a locking bolt coupled to the bolt coupling hole and having a corresponding thread portion longer than the thread portion formed in the bolt coupling hole.

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In this case, an inclined surface may be formed at one end of the threaded portion of the bolt coupling hole, and a corresponding inclined surface may be formed at one end of the locking bolt.

Meanwhile, the locking parts may be formed in plural, and the plurality of locking parts may be spaced apart at equal intervals in the circumferential direction of the main nut.

Since the lock nut according to the embodiment of the present invention extends the interval between the threads of the lock nut coupled to the shaft member and engages the lock nut on the shaft, there is no play between adjacent shaft coupling members installed on the shaft. .

1 is a perspective view of a lock nut according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of AA in FIG. 1 and is an exploded perspective view of the lock nut according to the first embodiment of the present invention.
3 is a perspective view of a stopper of the lock nut according to the first embodiment of the present invention.
4 is a cross-sectional view of a locking part of the lock nut according to the first embodiment of the present invention.
5 is a cross-sectional view showing a state in which the lock nut according to the first embodiment of the present invention is coupled to the shaft and the adjacent shaft engaging member.
6 is a sectional view showing a locking part of the lock nut according to the second embodiment of the present invention.
7 is a perspective view of a lock nut according to a third embodiment of the present invention.
8 is a sectional view of a locking part of the lock nut according to the third embodiment of the present invention.
9 is a sectional view showing a state in which the lock nut according to the third embodiment of the present invention is coupled to the shaft and the adjacent shaft engaging member.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention.

1 is a perspective view of a lock nut according to a first embodiment of the present invention. 2 is an exploded perspective view of the lock nut according to the first embodiment of the present invention. 3 is a perspective view of a stopper of the lock nut according to the first embodiment of the present invention. 4 is a cross-sectional view of a locking part of the lock nut according to the first embodiment of the present invention.

1 to 4, the lock nut 10 according to the first embodiment of the present invention includes a main nut 20 and a plurality of locking parts 40 formed on the main nut 20.

The main nut 20 includes a main nut body 21 having a hexagonal cross section. At this time, the main nut body 21 includes a first body 22 and a second body 24.

The first body 22 and the second body 24 may each consist of a pair of nuts having a hexagonal cross section and having a predetermined thickness. Inner surfaces of the first body 22 and the second body 24 are formed with a first main thread 26 and a second main thread 28, respectively.

The first body 22 and the second body 24 are arranged to be spaced apart from each other on the concentric axis and may be integrally formed by the connecting portion 25.

More specifically, the connection portion 25 is located between the first body 22 and the second body 24 on the outer peripheral side of the main nut 20, the center groove in the inside of the connection portion 25 in the direction parallel to the central axis 23 is formed. In this case, the central axis means an axis to which the lock nut is coupled.

Accordingly, the inner part of the first body 22 and the inner part of the second body 24 are formed to be spaced apart from each other with the central groove 23 therebetween in a direction parallel to the central axis. The first body 22 and the second body 24 connected by the connecting portion 25 form a single nut 20, wherein the width of the first body 22 and the second body 24 is If necessary, they may be formed differently.

In this embodiment, the first body 22 and the second body 24 have been described as interconnected by the connecting portion 25, but the main nut 20 of the lock nut 10 according to an embodiment of the present invention is It is also possible to form a central groove in one nut to form a shape corresponding to the first body and the second body.

Meanwhile, the locking part 40 is formed in the main nut 20. The locking unit 40 adjusts the distance between the first body 22 and the second body 24 in a state where the main nut 20 is coupled to the shaft (1 in FIG. 5), thereby causing the main nut 20 to rotate. (1) It is a structure for being able to be fixed firmly on.

According to one embodiment of the present invention, the locking part 40 includes a bolt coupling hole 60 formed at one side of the main nut 20 and a locking bolt 50 coupled to the bolt coupling hole 60. .

More specifically, referring to FIG. 2, the bolt coupling hole 60 includes a through hole 64 penetrating the first body 22 and the second body 24. At this time, the threaded portion 62 is formed in the through hole 64 penetrating the first body 22, and the threaded portion is not formed in the through hole penetrating the second body 24. On the side of the through hole of the second body 24 is formed a bolt head receiving portion 66 is accommodated for the bolt head 54 of the locking bolt 50 to be described later.

Meanwhile, the locking bolt 50 includes a bolt body 52 and a bolt head 54.

The bolt body 52 has a diameter corresponding to the diameter of the through hole 64 and is formed to extend in a direction parallel to the central axis. One end of the bolt body 52 is formed with a corresponding threaded portion 56 corresponding to the threaded portion 62 formed in the through hole of the first body 22. At this time, the screw thread is not formed in the central portion of the bolt body 52 passing through the second body 24.

The bolt head 54 is formed at the other end of the bolt body 52 and is located at the bolt head receiving portion 66 in a state of being coupled to the bolt coupling hole 60. A cross or straight groove is formed on the top surface of the bolt head 54 such that the bolt head is rotatable by a driver.

Meanwhile, referring to FIGS. 2 and 3, the stopper 70 is formed on one side of the main nut 20 where the bolt head 54 is positioned while the locking bolt 50 is located in the bolt coupling hole 60. Combined.

The stopper 70 may include a plate-shaped body 71 having a hexagonal cross section having a shape corresponding to that of the main nut 20.

The stopper body 71 is formed with a stopper hole 72 having a diameter smaller than that of the bolt head 54. The stopping hole 72 is arranged concentrically with the bolt head 54 while the stopper 70 is coupled to the main nut 20.

The lock nut 10 according to an embodiment of the present invention is fastened to a cross or straight groove formed on the upper surface of the locking bolt 50 installed in the main nut 20 through a stopper hole 72 by a tool such as a driver. In this state, the locking bolt 50 can be rotated clockwise or counterclockwise with a screwdriver.

On the other hand, the lock nut 10 according to an embodiment of the present invention may include a plurality of locking parts (40). In the lock nut 10 according to the present embodiment, four locking portions 40 are formed at intervals of 90 degrees on the main nut 20 having a hexagonal cross section.

At this time, the number of the locking portion 40 may be variously changed to two to five or more, depending on the size of the lock nut 10 coupled to the shaft (1). When the thickness of the shaft (1) is thin, even if two locking portions (40) formed on the lock nut (10) is formed, the lock nut (10) can be firmly fixed to the shaft, but the thickness of the shaft (1) In the case of thick, the locking parts 40 must be formed in four or more lock nut 10 can be firmly fixed to the shaft.

Referring to FIG. 4, the lock nut 10 according to the exemplary embodiment of the present invention has a stopper 70 at one side of the main nut 20 in a state in which the locking bolt 50 is coupled to the bolt coupling hole 60. It is formed to be combined.

At this time, the locking bolt 50 located inside the bolt coupling hole 60 is formed with a recess, as described above, and can be rotated by a tool such as a screwdriver. In this case, the locking bolt 50 is rotated. Even though the bolt head 54 of the locking bolt 50 is fixed to the bolt head receiving portion 66 of the first body 22, the locking bolt 50 itself is relatively relative to the second body 24. It is formed to prevent movement, ie forward or retreat.

The corresponding threaded portion 56 formed at one end of the locking bolt 50 is engaged with the threaded portion 62 formed at one side of the first body 22. Accordingly, in FIG. 4, when the locking bolt 50 is rotated in the clockwise direction, the locking bolt 50 moves with respect to the first body 22 in the forward direction, that is, in the left direction in FIG. 4.

As such, when the locking bolt 50 moves in the left direction, the first body 22 moves in the right direction, and the second main threaded portion 28 and the first body 22 of the second body 24 move. The distance between the first main threaded portion 26 of the is narrowed. If the locking bolt 50 is rotated counterclockwise with respect to the second body 24, the locking bolt 50 is formed by the first body (because the bolt head 54 is fixed to the second body 24). 22) move in the retraction direction. Accordingly, the first body 22 moves relatively in the left direction, so that between the first main threaded portion 26 of the first body 22 and the second main threaded portion 28 of the second body 24. Will be farther away.

The lock nut 10 according to an embodiment of the present invention rotates the locking bolt 50 located between the first body 22 and the second body 24 to fix the lock nut 10 to the shaft. With the lock nut 10 coupled to the shaft 1, the distance between the first main threaded portion 26 of the first body 22 and the second main threaded portion 28 of the second body 24 is farther apart. To lock the lock nut 10 to the shaft.

In more detail, Figure 5 is a cross-sectional view showing a state in which the lock nut 10 is coupled to the shaft 1 and the adjacent shaft coupling member 2 according to an embodiment of the present invention.

Referring to FIG. 5, the lock nut 10 according to an embodiment of the present invention may be screwed to the shaft 1 so that the lock nut 10 may be firmly held without falling out of the shaft 1. have.

At this time, the shaft coupling member 2 may be positioned on the shaft 1 adjacent to the lock nut 10 screwed to the shaft 1. The shaft coupling member 2 is a predetermined part which is positioned adjacent to the lock nut 10 in a state of being coupled to the shaft 1 and fixed in position on the shaft, and in which a gap does not occur between the lock nut and the lock nut. Can be.

The lock nut 10 according to the present embodiment is screwed to the shaft 1 adjacent to the shaft coupling member 2 in a state in which the shaft coupling member 2 is coupled to the shaft 1.

The locking bolt 50 of the lock nut 10 before being screwed onto the shaft 1 has a first main threaded portion 26 of the first body 22 and a second main threaded portion of the second body 24. The first body 22 is not pressed in a specific direction so that the 28 can be easily coupled to the shaft.

When the lock nut 10 is disposed adjacent to the shaft engaging member 2 in a state where the lock nut 10 is screwed to the shaft 1, the locking bolt 50 of the lock nut 10 is rotated counterclockwise to lock the bolt 50. ) Is retracted in the right direction when viewed in FIG. 5.

When the locking bolt 50 is retracted in the right direction as described above, the first main screw thread portion 26 of the first body 22 receives the force in the left direction as shown in FIG. 5, and the first body 22 and the first body 22 are formed. As the two bodies 24 are opened to each other, the first main threaded portion 26 and the second main threaded portion 28 are opened. The first main threaded portion 26 and the second main threaded portion 28, which are separated from each other, are frictionally engaged with the threads positioned on the shaft 1 so that the lock nut 10 is firmly fixed on the shaft.

As such, when the first body 22 and the second body 24 are opened and the main nut 20 is fixed on the shaft, the side surface of the first body 22, that is, one surface of the main nut adjacent to the shaft coupling member 2 is formed. Since the silver comes in stronger contact with the shaft engaging member 2 without being spaced apart, there is no play between the shaft engaging member 2 and the lock nut 10 and the engagement is maintained.

As such, when there is no play between the shaft coupling member 2 and the lock nut 10, the play may occur as the play between the shaft coupling member 2 and the lock nut 10 occurs even if the shaft 1 rotates. Component breakage due to vibration or the like can be prevented.

The lock nut 10 according to an embodiment of the present invention forms a locking portion 40 between the first body 22 and the second body 24 to form a first main threaded portion of the first body 22 ( The lock nut 10 can be fixed on the shaft 1 by separating it from the second main threaded portion 28 of the second body 24. At this time, the configuration of the locking portion between the first body 22 and the second body 24 may be different from the above-described embodiment. Hereinafter, various modifications of the locking unit will be described with different drawings.

6 shows a lock nut 10 according to a second embodiment of the invention. In the following description of the second embodiment, the same configuration as that of the first embodiment will be omitted, and a description will be given focusing on the configuration distinguished from the first embodiment.

Referring to FIG. 6, in the lock nut 10 according to the second embodiment of the present invention, the bolt coupling hole 60 is formed only in the second body 24 without the bolt coupling hole formed in the first body 22. It is formed in a direction parallel to the axis.

At this time, the head receiving portion 66 of the locking bolt 50 is formed at one side end of the bolt coupling hole 60. The head receiving portion 66 is formed to have a predetermined space so that the bolt head 54 of the locking bolt 50 accommodated therein is movable in the direction parallel to the axis.

Meanwhile, a threaded portion is formed in the bolt coupling hole 60 of the second body 24, and the body of the locking bolt 50 corresponds to a threaded portion formed in the bolt coupling hole 60 of the second body 24. Corresponding threaded portions are formed in position.

In the lock nut 10 according to the second embodiment of the present invention, the locking portion 40 moves the locking bolt 50 screwed to the bolt coupling hole 60 of the second body 24 in a clockwise direction. The locking bolt 50 is formed to press the side of the first body 22.

As such, when the locking bolt 50 presses the side surface of the first body 22, the first body 22 is pressed in the left direction as shown in FIG. 6, and the first main threaded portion of the first body 22 ( 26 may also be moved to the left side together with the first body 22.

When the first main threaded portion 26 of the first body 22 is moved in the left direction, the lock nut 10 is shafted in the above-described embodiment as the gap between the first body 22 and the second body 24 opens. The lock nut 10 can be firmly engaged on the shaft 1 in a manner similar to the manner in which no gap occurs with adjacent shaft engaging members 2 in the phase and screw engagement is maintained.

7 is a perspective view of the lock nut 110 according to the third embodiment of the present invention. 8 is a cross-sectional view of the locking portion 140 of the lock nut 110 according to the third embodiment of the present invention. 9 is a cross-sectional view showing a state in which the lock nut 110 according to the third embodiment of the present invention is coupled to the shaft 1 and the adjacent shaft engaging member 2.

According to the third embodiment of the present invention, a locking bolt of the lock nut for spaced apart between the first main threaded portion of the first body and the second main threaded portion of the second body is provided with the first and second embodiments. It may alternatively be located in a direction perpendicular to the axis. Hereinafter, in describing the third embodiment of the present invention, a detailed description of the same configuration as the previous embodiment will be omitted, and the third embodiment of the present invention will be described based on the configuration that is different from the previous embodiments.

According to the third embodiment of the present invention, the locking part 140 formed on the lock nut 110 includes a locking bolt 150 penetrated in the direction of the central axis from the outer surface of the main nut 120.

The bolt coupling hole 160 to which the locking bolt 150 is coupled is formed to penetrate in the direction of the central axis from the outer surface of the main nut 120.

Referring to FIG. 8, one side of the inner circumferential surface of the bolt coupling hole 160 is formed on one side of the first body 122, and one side facing the one side of the inner circumferential surface of the bolt coupling hole 160 of the second body 124. It is formed on one side.

At one end of the bolt coupling hole 160, a bolt head receiving part 166 is disposed to accommodate the bolt head 154. At this time, the bolt head receiving portion 166 is located on the outer side of the main nut (120).

The depth of the bolt head receiving portion 166 may be formed deeper than the height of the bolt head 154 so that the bolt head 154 can be inserted in the direction of the central axis with the bolt head 154 of the locking bolt 150 received. Can be. An inclined surface 168 is formed at an inner end of the bolt coupling hole 160.

The locking bolt 150 screwed into the bolt coupling hole 160 is formed to include a bolt body 152 and a bolt head 154.

The bolt body 152 is formed with a corresponding threaded portion 156 on the outer circumferential surface. An inclined portion 158 is formed at one end of the bolt body 152.

Meanwhile, referring to FIG. 9, the length LB of the corresponding threaded portion 156 formed on the outer circumferential surface of the bolt body 152 is longer than the length LO of the threaded portion 168 formed in the bolt coupling hole 160. Is formed.

Accordingly, when one end of the locking bolt 150 is inserted in the direction of the central axis of the main nut 120 while the locking bolt 150 is screwed to the bolt coupling hole 160, the locking bolt 150 is a corresponding thread. Since the portion 156 is longer than the threaded portion 162 of the bolt coupling hole 160, the inclined surface 158 of the locking bolt 150 is formed on the inclined surface 168 formed at one end of the bolt coupling hole 160 at a predetermined position. It is formed to be in contact.

At this time, when the locking bolt 150 is rotated and moved in the direction of the central axis, the inclined surface 158 of the locking bolt 150 pushes the inclined surface 168 of the bolt coupling hole 160 in both sides. As such, when both inclined surfaces 168 of the bolt coupling hole 160 are pushed in both lateral directions, the first main threaded portion 126 of the first body 122 and the second main threaded portion of the second body 124 ( 128) will be separated from each other.

As such, when the first main threaded portion 126 of the first body 122 and the second main threaded portion 128 of the second body 124 are opened to each other, the lock nut 110 is described as described in the foregoing embodiment. ) Is positioned adjacent to the shaft (1) and the shaft coupling member (2), there is no play between the shaft coupling member (2) and the lock nut (110) by the coupling of the lock nut (110), Lock nut 110 may be coupled to the shaft.

The lock nut 110 according to the third embodiment of the present invention is formed so that the gap between the first body and the second body may be widened as the locking bolt 150 moves in a direction perpendicular to the axis. No stopper as in the first embodiment is necessary.

In this embodiment, when the locking bolt fitted to the lock nut moves in the axial direction or the direction perpendicular to the axis, the gap between the first body and the second body is opened so that the lock nut is firmly fixed to the shaft. It is to be understood that the spirit of the present invention encompasses all of the configurations capable of securing the lock nut to the shaft by spaced apart the distance between the first body and the second body.

In addition, while various embodiments of the present invention have been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art to understand the spirit of the present invention, within the scope of the same idea, the components Other embodiments may be easily proposed by the addition, modification, deletion, addition, etc., but this is also within the scope of the present invention.

1 axis 2 axis coupling member
10 Lock Nut 20 Zut Nut
21 Body 22 First Body
23 Center groove 24 Second body
26 Week 1 Thread 28 Week 2 Thread
25 connections 40 locking parts
50 locking bolt 52 bolt body
54 bolt head 56 thread
60 bolt coupling hole 62 thread
64 Through Hole 66 Head Receptacle
70 stopper 71 body
72 Stopping Hole 110 Lock Nut
120 Znut Nut 140 Locking Part
150 locking bolt 160 bolt coupling hole

Claims (8)

delete delete delete A main nut having a first main screw thread and a second main screw thread spaced apart from each other in a direction parallel to the central axis; And
It includes a locking portion located on one side of the main nut so as to extend the interval between the first main screw thread and the second main screw thread,
The nut is
A first body having the first main screw thread formed on an inner side surface thereof; And
The second main screw thread includes a second body formed on the inner side,
The first body and the second body are interconnected by a connecting portion at the outer peripheral portion of the main nut,
The locking part
A bolt coupling hole formed in a straight line on the first body and the second body in parallel with the central axis; And
Includes a locking bolt coupled to the bolt coupling hole and having a bolt head fixed to one side of the second body,
The bolt coupling hole is formed with a screw thread on one side of the first body,
The locking bolt is formed with a corresponding threaded portion at a position corresponding to the threaded portion formed on one side of the first body,
A stopper is formed on one side of the main nut to prevent retraction of the locking bolt.
And the stopper is formed with a stopping hole having a diameter smaller than the locking bolt head. A main nut having a first main screw thread and a second main screw thread spaced apart from each other in a direction parallel to the central axis; And
It includes a locking portion located on one side of the main nut so as to extend the interval between the first main screw thread and the second main screw thread,
The nut is
A first body having the first main screw thread formed on an inner side surface thereof; And
The second main screw thread includes a second body formed on the inner side,
The first body and the second body are interconnected by a connecting portion at the outer peripheral portion of the main nut,
The locking part
A bolt coupling hole formed through the second body in parallel with the central axis; And
It includes a locking bolt coupled to the bolt coupling hole so that one end can press the side of the first body,
The bolt coupling hole is formed with a threaded portion on one side of the second body,
The locking bolt is formed with a corresponding threaded portion at a position corresponding to the threaded portion formed on one side of the second body,
A stopper is formed on one side of the main nut to prevent retraction of the locking bolt.
The stop nut is formed in the stopper has a stopper hole having a diameter smaller than the bolt head. A main nut having a first main screw thread and a second main screw thread spaced apart from each other in a direction parallel to the central axis; And
It includes a locking portion located on one side of the main nut so as to extend the interval between the first main screw thread and the second main screw thread,
The nut is
A first body having the first main screw thread formed on an inner side surface thereof; And
The second main screw thread includes a second body formed on the inner side,
The first body and the second body are interconnected by a connecting portion at the outer peripheral portion of the main nut,
The locking portion
A bolt coupling hole formed at the connection part in the direction of the center of the main nut from an outer surface of the main nut, and having a threaded portion formed at one side of the first body and one side of the second body facing the first body; And
And a locking bolt coupled to the bolt coupling hole and having a corresponding thread portion longer than the thread portion formed in the bolt coupling hole. The method according to claim 6,
An inclined surface is formed at one end of the threaded portion of the bolt coupling hole,
One end of the locking bolt has a corresponding inclined surface formed therein, the lock nut
8. The method according to any one of claims 4 to 7,
The locking part is formed of a plurality, the plurality of locking parts are formed spaced apart at equal intervals in the circumferential direction of the main nut, lock nut.

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