KR20170017163A - Auto-fastening nut using Anti-loose technology of Double elastic Fastening - Google Patents

Abstract

The present invention relates to an automatically fastening nut which has excellent unfastening prevention performance and a simple manufacturing process, is thin using a double elastic unfastening prevention technology, and a double elastic unfastening prevention method. According to the present invention, the automatically fastening nut comprises: a nut main body having a female screw inside; an unfastening prevention spring protruding from the nut main body to the outside in a screw cross-section which is same as that of the female screw of the nut main body; and a guiding member fixated to the nut main body having a through hole in which the unfastening prevention spring is inserted and guided. An effective diameter of the screw cross-section of the unfastening prevention spring is smaller than that of the female screw of the nut main body. According to the present invention, as the unfastening prevention spring improves a friction force coming in contact with a bolt thread, the unfastening prevention performance and reliability is improved. Moreover, production process is simple, and price competitiveness is able to be increased.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic locking nut using an anti-

The present invention relates to an automatic locking nut, and more particularly, to an automatic locking nut and a double elastic locking prevention method which are thin and thin, but are excellent in anti-loosening performance, by using a double elastic locking prevention technique.

Numerous screws and nuts are used for construction, main structures, and machine structures. Even if the screw is fixed by the nut, if some kind of load is applied, the screw may be loosened and the accident may occur.

Recently, the cause of screw loosening has been gradually clarified, but the effect of various loosening preventing parts such as spring washers and double nuts is not fully understood. Therefore, there is an increasing demand for an anti-loosening nut.

Currently, most of the nuts for construction, major structures, and mechanical structures are supplied with high royalty and foreign products are imported. Recently, the anti-loosening nut market is growing fast, And it is very important and urgent to research and develop localization for this.

Areas with severe shocks and vibrations, such as various joints and branches in railway and civil engineering fields, connecting parts of wind turbine generators and turbine generators in power plants, are prone to loosening and should be regularly inspected or replaced Which causes inconvenience and economic loss.

Due to the very high price and the use of domestic products, there are many places that are necessary in many construction and machinery fields due to complicated and demanding demands and additional costs. However, there is a desperate need for domestic alternative technology for quick response and substitution effect. Is required. It is a high-performance anti-loosening nut. It is available in USA, Illox, France, Lanfranko and Hard Rock products in Japan.

In Nylox USA, special nylon is attached to the threaded part, and then it is produced by the frictional bonding force which is caused by the tightening force. However, the aging effect of nylon and the performance degradation at high temperature are problems. In Lanfranko, France, two bolts on the top of the conventional nut are wrapped so that the threads of the bolt are not shaken, and when the vibration occurs, the threads of the nut and the bolt are wrapped around each other, The anti-loosening function is lower than the product. Hard Rock Company of Japan produces a product that has a function to prevent loosening by generating vertical force to the bolt by using a concave and convex double nut, but it has a disadvantage that it loosens and loosens the tightening state with time.

Korean Patent Publication No. 2003-0035314 (assembly of bolts and nuts), Korea Patent Publication No. 2011-0008702 (Locknut), Korea Patent Publication No. 2011-0042600 (unlocking prevention) Nut), Korean Laid-Open Patent Application No. 2014-0124595 (release preventing nut set).

 Korean Unexamined Patent Publication No. 2003-0035314 discloses a bolt having a head, a male and a female, A nut body having a through hole formed therethrough at both ends thereof and a nut inserted into the through hole of the nut body and having both ends fixed to the nut body and screwed together with the male screw portion.

 Korean Unexamined Patent Publication No. 2011-0008702 discloses that when a coil spring is engaged with a threaded portion of a bolt, a distal end portion of the coil spring is rotated along an opening portion so that a circumferential portion of the coil spring is press- The coupling force between the coil spring and the threaded portion of the bolt is weakened and the lock nut can be easily rotated by rotating the lock nut. Structure.

Korean Patent Publication No. 2011-0042600 has a threaded portion formed with a helical groove and a bolt hole formed by a flat cylindrical surface extending coaxially with the threaded portion and having an inner diameter larger than a minimum inner diameter of the threaded portion, A bending part formed at one end of the bending part is fixed to the fixing hole and is wound in the same spiral direction as the threaded part, A coil spring having a hook formed on an outer surface thereof; and an arc plate interposed between the inner peripheral surface of the enlarged diameter portion and the coil spring, the push plate including a support hole penetrating the bent portion of the coil spring and a hook- .

Korean Patent Laid-Open Publication No. 2014-0124595 discloses a bolt having a nut portion to be fastened to a bolt, a loosening preventing portion that is fastened to the bolt in contact with the nut portion and elastically blocks the loosening of the bolt by a coil spring installed therein And a protruding portion and a concave machining portion corresponding to the protruding portion are formed at a portion where the nut portion and the release preventing portion are in contact with each other.

In Korea, a variety of anti-loosening nuts have been developed and manufactured using anti-loosening springs or coil springs. However, there is a limit to the contact friction between the anti-loosening spring or the coil spring and the thread surface of the bolt. Therefore, there is a need to develop a product that has higher performance and higher reliability than those of the anti-loosening nuts, and that can simplify the production process and increase the price competitiveness.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned needs, and it is an object of the present invention to provide an anti-loosening device that can increase the frictional force of the anti-loose spring against the threads of the bolt, The present invention provides an automatic locking nut and a double elastic locking unlocking method using the double elastic locking unlocking technique.

In order to achieve the above object, an automatic locking nut according to the present invention is provided with a nut body having a female screw formed therein, And a guide member fixed to the nut body, wherein the effective diameter of the threaded end face of the release preventing spring is smaller than the effective diameter of the female screw of the nut body.

The release preventing spring is integrally formed by being connected to the female screw of the nut body. The one end of the release preventing spring can be detachably fixed to the nut body. The release preventing spring may have one end fixed to the guide member. And the other end of the release preventing spring may be fixed to the guide member.

The release preventing spring may be separated into two, one of which is fixed to the nut body and the other of which is fixed to the guide member.

The nut body and the guide member can be detachably fixed by the engagement groove and the engagement projection. The difference Dh-Di between the diameter Dh of the through hole of the guide member and the diameter Dh of the threaded bore of the nut body depends on the effective diameter Df of the female thread of the nut body and the effective diameter Ds of the thread- Is equal to or larger than the difference (Df-Ds).

In the double elastic locking preventing method using the automatic locking nut according to the present invention, the number of loosening of the loosening preventing spring is set to four times or more.

According to the automatic locking nut and the double elastic locking unlocking method using the double elastic locking unlocking technique according to the present invention, it is possible to increase the frictional force of the unlocking spring against the thread of the bolt to improve the unlocking performance and the reliability, It is simple and has the effect of increasing price competitiveness.

Further, according to the automatic locking nut and the double elastic locking prevention method using the double elastic locking unlocking technique according to the present invention, it is possible to minimize the thickness of the nut and to use it in a product such as an automobile or an airplane, It can be effectively used where strong loosening protection is required even if the weight of the wind turbine or turbine of the power plant is slightly increased.

1 is an exploded perspective view of an automatic lock nut according to an embodiment of the present invention.
Fig. 2 is a partial cross-sectional view of the nut main body of Fig. 1. Fig.
3 is an assembled view of an automatic lock nut according to an embodiment of the present invention.
4 is a partial cross-sectional view showing a state where an automatic lock nut according to an embodiment of the present invention is fastened to a bolt.
5 and 6 are FBDs for explaining the action of the force (tension) in the automatic lock nut according to the embodiment of the present invention.
FIG. 7 and FIG. 8 are graphs showing the tensile strength of the self-locking nut according to the embodiment of the present invention in accordance with the winding number of the release preventing spring.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

FIG. 1 is an exploded perspective view of an automatic lock nut according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of the nut main body of FIG. 1, and FIG. 3 is an assembled view of an automatic lock nut according to an embodiment of the present invention. As shown in the drawings, an automatic locking nut 100 using a double elastic locking and unlocking technique according to an embodiment of the present invention includes a nut body 110, a release preventing spring 120, and a guide member 130.

The automatic locking nut 100 of the present invention is automatically locked by the screw section shape of the female screw of the nut body 110 and the release preventing spring 120 and is prevented from being loosened by the elastic force of the release preventing spring 120 Is a high-performance, self-locking, self-locking nut. The auto-locking nut 110 may be formed of a material such as a metal material or an engineering plastic.

The nut body 110 has a hexagonal nut shape in which a female screw 111 is formed. The nut body 110 may have various shapes such as a square nut shape. The female screw 111 may be a triangular screw, a trapezoidal screw, or the like, but is preferably a triangular screw having a high anti-loosening effect according to the inclined surface of the thread. The effective diameter Df of the female screw 111 is formed to be larger than the effective diameter of the thread end surface of the release preventing spring 120 described later.

An engaging groove 112 is formed on one side of the nut body 110 on the side of the release preventing spring so that the engaging protrusion of the guide member 130 can be detachably engaged to engage and fix the guide member 130. A plurality of (one in the present embodiment, three) engaging grooves 112 are formed along the circumferential direction at the edge of one side of the nut body 110. A locking protrusion may be formed on the nut body 110. In this case, the guide member 130 is formed with a locking groove in which a locking protrusion is fitted and fixed. The nut body 110 and the guide member 130 can be detachably fixed to each other by various fastening means or fixing means in addition to a fitting structure of the fastening protrusions and the fastening protrusions. For example, the nut body 110 and the guide member 130 may be detachably fixed to each other by a magnet, a fixing pin, or the like.

The release preventing spring 120 is formed in the shape of a thread 121 (triangular screw section in this embodiment) identical to the female thread 111 of the nut body 110, And is protruded outward. The effective thread diameter Ds of the unthreading spring 120 is formed to be smaller than the effective diameter Df of the female thread 111 of the nut body 110. [

The release preventing spring 120 is integrally formed by being connected to the female screw 111 of the nut body 110. The release preventing spring 120 may be formed as a separate member from the nut main body 111. At this time, the one end of the release preventing spring 120 is detachably fixed to the nut main body 111. When the release preventing spring 120 is formed as a separate member from the nut body 110, the one end of the release preventing spring 120 may be fixed to the guide member 130. The other end of the release preventing spring 120 may be a free end or may be fixed to the guide member 130. The release preventing spring 120 may be separated into two, one of which is fixed to the nut body 110 and the other of which is fixed to the guide member 130.

The arrangement in which the release preventing spring 120 is fixed to the nut body 110 or the guide member 130 is such that the engagement end formed at the end of the general torsion spring is inserted into the hole or groove of the nut body 110 or the guide member 130 And may be structured to be fitted and fixed. The fixing structure of the release preventing spring 120 is not limited thereto and may be fixed to the nut body 110 or the guide member 130 in various forms. The release preventing spring 120 is formed of an elastic material.

The guide member 130 is a member that is fixed to the nut body 110 with a through hole 131 through which the release preventing spring 120 is inserted and guided. The guide member 130 has a hexagonal nut shape. The outer shape of the guide member 130 may have various angular shapes such as a square shape to facilitate fastening by the fastening tool together with the nut body 110. [

A locking protrusion 132 is formed on one side of the guide member 130 (a surface in contact with the nut body) to be detachably fitted to the locking groove 112 of the nut body 110. A plurality of locking protrusions 132 (three in this embodiment) are formed along the circumferential direction at the edge of one side face of the guide member 130. [ The structure in which the guide member 130 is fixed to the nut body 110 can be implemented in various structures as described for the nut body 110.

The difference Dh-Di between the diameter Dh of the through hole 131 of the guide member 130 and the thread diameter Dz of the nut body 110 is larger than the effective diameter Df of the female screw of the nut body 110. [ (Df-Ds) between the threaded end face effective diameter Ds of the release preventing spring 120 and the threaded end face effective diameter Ds of the release preventing spring 120 (see Fig. 4).

The automatic locking nut 110 using the double elastic locking and unlocking prevention technique according to the embodiment of the present invention is assembled and fastened to the bolt as shown in FIG. 4 is a partial cross-sectional view showing a state where an automatic lock nut according to an embodiment of the present invention is fastened to a bolt. As shown in the figure, when the automatic lock nut 100 is fastened to the bolt B, the effective thread diameter Ds of the release preventing spring 120 is larger than the effective diameter Df of the female thread 111 of the nut body 110 Is smaller than the effective diameter Df of the male thread of the bolt B, the thread 121 'before the deformation preventing spring 120 is deformed into the thread 121 after the deformation. That is, the effective thread diameter Ds of the unthreading spring 120 is changed to the effective diameter Df of the male thread of the bolt B while the threaded surface of the untrimming spring 120 is fixed to the surface of the male thread of the bolt B The contact friction force is increased. The increase of the contact friction force between the threaded surface of the release preventing spring 120 and the threaded surface of the bolt B leads to an increase in the tension required for releasing the nut,

The tension required for releasing the nut by the release preventing spring 120 can be interpreted according to the FBD (Free Body Diagram) shown in FIGS. 5 and 6. FIG. FIGS. 5 and 6 are FBDs for explaining the action of a force (tension) in the automatic lock nut according to the embodiment of the present invention, FIG. 5 is a tension FBD including a tension of the anti- Is a small area FBD.

An analysis of the tension according to the FBD in FIG. 6 is as follows.

[Equation 1]

&Quot; (2) "

Since the angle [Delta] [theta] is an extremely small angle, the following Equation 3 holds.

&Quot; (3) "

[Equation 1] and [Equation 2] are summarized using Equation 3, the following Equation 4 and Equation 5 are established.

&Quot; (4) "

&Quot; (5) "

(4) and (5) are summarized into the following equations (6) and (7).

&Quot; (6) "

&Quot; (7) "

(7) is integrated, and T = T _AD is inserted at θ = 0, the following equation (8) is obtained.

&Quot; (8) "

For example, in general, the coefficient of friction (f) between iron and iron is 0.2 to 0.4, so the T / T _AD according to θ values at friction coefficients of 0.2 and 0.4 is shown in Table 1 below.

θ T / T _AD
(f = 0.2) T / T _AD
(f = 0.4) 2π (Gam Kim 1) 3.5 12.3 4π (2) 12.3 152.4 6 π (Gim Kim 3) 43.4 1881.5 8 π (Gim Kim 4) 152.4 23227.6 10 π (Gim Kim 5) 535.5 286751.3

The values of T / T _AD according to [Table 1] are shown in Figs.

As shown in [Table 1] and [Fig. 7] and [Fig. 8], when the number of teeth is four or more, the tension ratio becomes remarkably large, and it is almost impossible to unscrew the nut. It can also be seen that when the coefficient of friction increases, the tension ratio thereof increases sharply. Therefore, according to the configuration of the present invention, the increase in the contact friction force (friction coefficient) between the threaded surface of the release preventing spring 120 and the threaded surface of the bolt B leads to an increase in the tension required for releasing the nut, Is significantly increased.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate the understanding of the present invention and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

110: nut body 111: female thread
112: latching groove 120: release preventing spring
121: threads 130: guide member
131: through hole 132:
B: Bolt

Claims (19)

A nut body having a female screw formed therein,
A release preventing spring projecting outwardly from the nut body in the same thread cross-sectional shape as the female thread of the nut body,
And a guide member formed with a through hole through which the release preventing spring is inserted and guided and fixed to the nut body,
Wherein the effective diameter of the threaded end face of the release preventing spring is smaller than the effective diameter of the female thread of the nut body. The method according to claim 1,
Wherein the unlocking spring is integrally formed by being connected to a female screw of the nut body. The method according to claim 1,
Wherein the one end of the release preventing spring is detachably fixed to the nut body. The method according to claim 1,
And the one end of the release spring is fixed to the guide member. The method of claim 4,
And the other end of the release preventing spring is fixed to the guide member. The method according to claim 1,
Characterized in that at least one end of the release spring is provided with a latching end so that the latching end is fitted in the hole or groove of the nut body or the guide member and is fixed. The method according to claim 1,
Wherein the release preventing spring is separated into two pieces, one of which is fixed to the nut body and the other of which is fixed to the guide member. The method according to claim 1,
Wherein the nut main body and the guide member are detachably fixed by an engaging groove and a locking protrusion. The method of claim 8,
Wherein the latching groove is formed in the nut body, and the latching protrusion is formed in the guide member. The method of claim 8,
Wherein the locking protrusion is formed in the nut body, and the locking groove is formed in the guide member. The method according to claim 1,
Wherein the threaded cross section of the female screw of the nut body and the unlocking spring is a triangular screw. The method according to claim 1,
Wherein the threaded section of the female screw of the nut body and the unlocking spring is a trapezoidal screw. The method according to claim 1,
And the release preventing spring is made of an elastic material. The method according to claim 1,
Wherein the nut body and the release preventing spring are made of engineering plastic material. The method according to claim 1,
Wherein the nut body and the guide member are detachably fixed by a magnet. The method according to claim 1,
Wherein the nut body and the guide member are detachably fixed by a fixing pin. The method according to claim 1,
Wherein an outer shape of the guide member is a square nut shape. The method according to claim 1,
The difference (Dh-Di) between the diameter (Dh) of the through hole of the guide member and the thread diameter (Di) of the nut body is
Is equal to or larger than a difference (Df-Ds) between an effective diameter (Df) of a female screw of the nut body and a threaded cross-sectional effective diameter (Ds) of the release prevention spring Locked nut. A nut main body having a female thread formed therein, a release preventing spring projecting outwardly from the nut body in the same thread cross-sectional shape as the female thread of the nut main body, and a through hole through which the release preventing spring is inserted, And an effective diameter of the threaded end face of the unlocking spring is smaller than an effective diameter of the female thread of the nut body to prevent the nut from loosening by using an automatic locking nut,
And the number of loosening of the release preventing spring is four or more.

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