WO2019039627A1

WO2019039627A1 - Screw thread structure and bolt and nut having screw thread structure formed thereon

Info

Publication number: WO2019039627A1
Application number: PCT/KR2017/009249
Authority: WO
Inventors: 한동렬
Original assignee: 한동렬
Priority date: 2017-08-23
Filing date: 2017-08-24
Publication date: 2019-02-28
Also published as: KR102009665B1; KR20190022328A

Abstract

A screw thread structure according to the present invention comprises: a body; and a screw thread formed to protrude from the body, an end of the screw thread having a first groove formed thereon along a rotation direction and having a second groove formed thereon in such a direction that the same extends across the first groove.

Description

Threaded structures, bolts and nuts with threaded structures

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a threaded structure and a bolt and a nut formed with a threaded structure and more particularly to a threaded structure for preventing a threaded joint from being loosened due to an external force, To a bolt and a nut in which a threaded structure is formed.

Screw joint means that the groove is made out of the cylinder by bolt and bolt and the nut is screwed in the inside of the cylinder to distinguish it from welding or flange.

That is, the screw threads are formed continuously with the horizontal line at a certain angle (?). Then, the bolts or nuts having male and female threads are rotated together with the rotations applied in the vertical direction so that both are engaged.

As a result, since the threads are inclined at an angle of θ with respect to the horizontal line and the both are mounted on the inclined surfaces in accordance with the rotation about the upward and downward axes, the entire path for coupling is longer than the simple coupling in the upward and downward directions , And the strength for fastening is reduced.

On the other hand, in the screw connection, in consideration of the points for reducing the wear amount of the member surface at the time of assembling and disassembling, the point for reducing the torque required when tightening, the point for protecting the base material from vibration, It is common to exist.

However, due to the existence of the pores, when the external force such as continuous or periodic vibration or shock is applied to the fastening part, the two members are separated according to the inclination of the thread.

Especially in the case of transportation equipment such as spacecraft, airplane, high-speed railway, automobile, military goods, etc. or wind power generators, power plants, bridges, high-rise buildings or ultra precision production equipment such as semiconductor, LCD and OLED production lines, There is a problem in that the threaded joint is loosened and a screwed structure of various structures is proposed to prevent the threaded joint from being loosened, resulting in loss of precision, trouble or accident.

FIG. 1 is a view of a threaded structure for performing a conventional unlocking function, and FIG. 2 is a view for explaining a concept of preventing loosening through the structure of FIG.

Referring to Figs. 1 and 2, a continuous groove 1a is formed at the end of the thread 1. The first thread 1b and the second thread 1c are formed at the end of the thread 1 according to the formation of the groove 1a.

The angle? 2 formed by the first screw thread 1b and the second screw thread is larger than the angle? 1 formed by the thread.

2, when the thread 1 is inserted into the thread groove 2 of the other member, the first thread 1b and the second thread 1c are elastically deformed inward .

As a result, even if there is a gap between the thread 1 and the thread 2 as described above, the first thread 1b and the second thread 1c are in contact with the inner surface of the thread 2 (X-point). Therefore, a loosening phenomenon due to an external force such as shock and vibration can be remarkably reduced as compared with a simple screw connection with a gap.

However, in the case of the above-mentioned threaded structure, since the first thread 1b and the second thread 1c are continuously formed along the thread, two line contacts along the threads are continuous during threading, There is a disadvantage that a wear amount due to the frictional effect is excessive and a large torque is required.

The present invention has been devised in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a threaded structure and a threaded structure capable of reducing disadvantages while maintaining the advantages of a thread- Bolts or nuts.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the threaded structure of the present invention includes a threaded portion formed on a body and a body and having a first groove along a rotating direction at a tip thereof and a second groove formed in a direction transverse to the first groove.

The second grooves may be formed to cross the plurality of first grooves.

The second grooves may be formed to form a predetermined angle in the vertical direction.

And the thread is divided into a coupling region to be engaged with a thread groove to be engaged and a non-coupling region to be exposed, and the second groove can be formed in the non-coupling region.

In the bolt and nut of the present invention, the above-described threaded structure may be formed.

In order to solve the above-described problems, the present invention provides a bolt or a nut having a threaded structure and a threaded structure, which has the following effects.

First, there is an advantage that the durability life can be increased by reducing the amount of wear when tightening or separating, by adjusting excessive contact portions of the conventional anti-loose threaded structure.

Secondly, there is an advantage that it is possible to adjust the amount of torque necessary for tightening or separating by adjusting the width or the number of grooves.

Third, it is possible to prevent the phenomenon that the continuous groove is short-circuited while the advantage of the frictional resistance by the existing contact is maintained, and the phenomenon of being released by the external force such as vibration and impact applied between the two members due to the step- There are advantages.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

FIG. 1 is a view of a threaded structure for performing a conventional unlocking function; FIG.

FIG. 2 is a view for explaining a concept of preventing loosening through the structure of FIG. 1; FIG.

FIG. 3 is a perspective view of a bolt formed with a threaded structure according to an embodiment of the present invention; FIG.

4 is a perspective view showing a state where a nut is coupled to a bolt formed with a threaded structure according to an embodiment of the present invention;

FIG. 5 and FIG. 6 are diagrams for explaining a step effect by the second groove; FIG.

FIGS. 7 to 11 are perspective views showing bolts of another embodiment of the present invention; FIG.

12 to 17 are perspective views showing a bolt according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

3 is a perspective view of a bolt having a threaded structure according to an embodiment of the present invention. The threaded structure of the present invention may be formed on the outer circumferential surface of the bolt or on the inner circumferential surface of the nut. Hereinafter, with reference to FIG. 3 for the sake of convenience, the description will be made on the basis of a case where it is formed on the outer peripheral surface of the bolt 10. FIG.

Referring to FIG. 3, a bolt having a threaded structure according to an embodiment of the present invention is formed with a thread 11 on an outer circumferential surface of a body 10 of a cylindrical body. A first groove 11a for forming a first screw thread 11b and a second screw thread 11c is formed at an end of the screw thread 11a.

The second groove 12 is formed in a direction crossing the first groove 11a. Thus, unlike the prior art unlocking threaded structures (see FIGS. 1 and 2), the first grooves 11a are not continuously connected, but are short-circuited by the second grooves 12.

Although the second groove 12 in this embodiment is formed only at a depth of a part of the thread 11, there is no limitation on the depth of the recess 11 of the thread 11 as long as the first groove 11a is short-circuited , Preferably less than half the thread height.

In addition, the second groove 12 may be formed to cross the plurality of first grooves 11a of the thread 11. Since a plurality of threads 11 are formed on the circumferential surface of the body 10, when the second grooves 12 are formed in the upward and downward directions as shown in FIG. 3, the plurality of first grooves 11, As shown in FIG.

In this case, it is possible to easily mass-produce the bolt or nut without changing the existing production facility through the process of forming the second groove 12 in the process before forming the thread in the process of forming the bolt or the nut and then forming the thread or forming the thread.

FIG. 4 is a perspective view showing a state in which a nut is coupled to a bolt formed with a threaded structure according to an embodiment of the present invention, and FIG. 5 is a view for explaining a step effect by the second groove.

4 and 5, when the nut 20 is engaged, the second groove 12 is exposed to the protruded lower portion of the portion where the nut 20 is engaged.

Therefore, when an external force such as vibration or impact is applied and the nut or bolt rotates slightly along the inclined surface of the thread, the end portion of the thread of the nut 20 is loosened along the first groove 11 continuously formed, And is positioned at the portion where the groove 12 is formed. And then further rotated to make contact with the first groove 11 again.

In this case, the first screw thread 11b 'and the second screw thread 11c' on both sides of the first groove 11a which are not engaged with the nut 20 are formed at an angle 2) larger than the angle? 1 (see Fig. 6). Therefore, it functions to form a barrier that can not directly enter the threaded boss 22 of the nut 20. [

Therefore, an effect of preventing loosening of the screw due to an external force such as vibration or shock is added.

Furthermore, in the present embodiment, the second groove 12 is formed so as to cross the plurality of first grooves 11 located in the upward and downward directions, so that the effect of forming a plurality of steps is obtained.

7 and 8 are perspective views showing a bolt according to another embodiment of the present invention. Referring to FIG. 7, in this embodiment, the second groove 12A may be formed at one point of the thread 11. 8, the second groove 12B in this embodiment is arranged to be inclined in a specific direction in the vertical direction.

Particularly in this case, when the first thread 11b 'and the second thread 11c' enter the threaded hole 22 of the nut 20 passing through the second groove 12, the first thread 11b ' (See Fig. 9).

3 and 4, when the second groove 12 is formed in the vertical direction, the first screw thread 11b and the second screw thread 11c are screwed into the threaded hole 22 of the nut 20 At the same time. Accordingly, although the effect of preventing the bolt from loosening due to the step effect described above is excellent, relatively strong force is required to relatively force the two steps at the same time when fastening the nut.

However, in the present embodiment, the two

threads

11a and 11b come into contact with the thread grooves of the nut sequentially. Therefore, in order to unscrew the nut 20, the effect of exceeding the first screw thread 11b 'and the second screw thread 11c', that is, the step of two passes, is obtained, and the force required for tightening the nut is relatively small have.

10 and 11 are views of another embodiment of the present invention. Referring to FIG. 9, the second groove 12C is formed so as to penetrate the plurality of threads 11 only in a part of the body 10 other than the whole.

Specifically, the body 10 is generally divided into a coupling region in which a thread groove engaging with the thread 11 is engaged and a non-coupling region in which the thread groove is exposed. In this embodiment, the second groove 12C is formed only in the non-engagement area where no thread groove is formed.

The point at which the actual step is generated occurs when the nut 20 is loosened by an external force such as vibration or impact, while passing through the second groove 12C in the region where the nut is not engaged. Therefore, in this embodiment, the second groove 12C is formed only in the non-coupling region that is not engaged with the thread 11. [

11, the second groove 12D in this embodiment shows that it can be formed in various shapes without a specific pattern.

That is, various types of nuts may be used for fastening, or a structure having threads other than the nut may be used. Therefore, it is possible to realize a step effect that prevents the unfastening of the fastening structure when the fastening structure is combined with various fastening structures by forming the second grooves 12D irregularly.

Meanwhile, the threaded structure of the present invention may be formed on the bolt or the nut as described above. And may also be applied to various fastening structures that are fastened by threads and threaded grooves.

12 is a perspective view of a threaded structure according to another embodiment of the present invention, and Fig. 13 is a sectional view of one end of Fig.

12 and 13, the threaded structure in this embodiment has one projection 111a formed on the entire surface of the thread, unlike the above embodiment.

Specifically, the thread 111 in this embodiment is formed to protrude from the body 110 and is spaced apart from the end of the thread groove by a predetermined distance so that a space is formed between the end of the threaded groove.

A projection 111 continuously protruding along the thread is formed at the front center of the thread so as to contact the end of the thread groove.

As described in the background art, in the case of threads and screw grooves in general, there is a gap even if it is engaged. Also, depending on the presence of the air gap, the thread is loosened due to external force applied periodically such as vibration or impact.

Accordingly, in this embodiment, the end of the thread is formed to be shorter than the depth of the thread groove so that a certain space is formed between the front of the thread and the end of the thread groove. In the space, the projections to be described later are deformed without interference while being in contact with the ends of the screw grooves.

FIG. 14 is a view for explaining a process of deformation by external force according to another embodiment of the present invention. Referring to FIG. 1, when an external force is applied in a specific direction, opposing surfaces of threads and thread grooves that are spaced apart from each other come into contact with external force applied in either direction. In this case, as shown in the figure, the end of the projection is in a state of being in contact with the end of the thread groove and deformed.

Particularly, although there is a difference depending on the material, the projections undergo elastic deformation in the state of being in contact with the thread groove due to the continuous external force through the deformation within the elastic region of the material.

That is, part of the applied external force is exhausted when the projection is deformed, not by the movement of the thread, and consequently, the threshold value for the external force for releasing the fastening structure is increased.

As shown in FIGS. 15 to 16, in this embodiment, the second groove across the thread may be formed at various angles as in the above-described embodiment.

In this embodiment, too, the projections are formed continuously with the threads, and the external force necessary for fastening increases by a certain amount as compared with a general screw fastening structure in which no projections are formed because the projections are in continuous contact with the screw grooves.

Therefore, by forming the second groove at a specific position, the projection can be prevented from being partially engaged with the screw groove, and the effect of adjusting the force required for fastening can be derived.

17 is a view for explaining the process of forming the projections of this embodiment. Referring to FIG. 17, in order to form the projection of the present embodiment, an external force due to the shape of the mold is applied to the upper and the rear of the thread during the process of forming the thread.

As a result, protrusions are formed while pressing the material according to application of an external force to the upper and the rear of the thread, and the protrusions are formed to be higher than the height at which the actual thread is formed by a certain distance d.

Therefore, even when considering the voids of threaded threads and threads, the protrusions 111a are formed at the ends of the threaded threads in Figs. 13 to 14, since the height of the protrusions is formed to be higher than the original height of the threads Contact.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

Claims

body; And

A thread protruding from the body and having a first groove along the rotational direction at a tip thereof and a second groove formed in a direction transverse to the first groove;

The threaded structure comprising:
The method according to claim 1,

And the second groove is formed to cross the plurality of first grooves.
The method according to claim 1,

Wherein the second groove is configured to form a constant angle in the vertical direction.
The method according to claim 1,

The threads are partitioned into a coupling region to be engaged with a thread groove to be engaged and a non-coupling region to be exposed,

And the second groove is formed in the non-engagement region.
5. The method according to any one of claims 1 to 4,

And the bolt formed with the threaded structure.
5. The method according to any one of claims 1 to 4,

Said nut being formed with said threaded structure.
body;

A thread protruding from the body and spaced a predetermined distance from an end of the thread groove so that a space is formed between the thread and the end of the thread;

A protrusion continuously protruding along the thread so as to come into contact with an end of the thread groove at the front center of the thread;

.
8. The method of claim 7,

And a second groove is formed across at least one of the threads.
8. The method of claim 7,

Wherein said projection is formed to be recessed inwardly at a predetermined curvature on an extension of said thread.
10. The method according to any one of claims 7 to 9,

And the bolt formed with the threaded structure.
10. The method according to any one of claims 7 to 9,

Said nut being formed with said threaded structure.