KR20240076136A - Washers and nuts with anti-loosening function for bolts - Google Patents

Abstract

In the present invention, when tightening a bolt by screwing, when the nut is coupled with a washer, the first tightening with the bolt is performed by a plurality of tightening jaws formed on the nut, and then the second tightening of the washer is sequentially performed by tightening the nut or bolt. First anti-loosening serrations are formed on the upper and lower surfaces to prevent the bolt from loosening as the bolt is inserted, and the insertion hole into which the bolt is inserted has a tapered inclined surface in the shape of a diamond. A washer that is formed in a curved shape that goes inward and protrudes in the opposite direction, and is flattened as a fastening object when screwed together with a bolt or nut and has a secondary tightening force; And a plurality of tightening protrusions in the shape of a diamond corresponding to the inclined surface of the insertion hole are formed between a plurality of cut grooves formed at predetermined intervals on the outer periphery of the fastening hole in the direction in which the bolt is inserted, wherein the plurality of tightening protrusions are A nut is formed with a diameter wider than the diameter of the insertion hole and is primarily tightened to the thread of the bolt while being inserted into the inclined surface of the insertion hole. A washer and nut for bolts having a loosening prevention function including a nut are provided.
Accordingly, it has the effect of ensuring high reliability of the product through a simple technical configuration rather than having a complicated technical configuration, and also has the effect of being able to easily assemble it by screwing it in without any hassle or inconvenience.

Description

Washers and nuts with anti-loosening function for bolts}

The present invention relates to a washer and a nut for a bolt having a loosening prevention function. More specifically, when fastening to a bolt by screwing, when the nut is coupled with the washer, the first tightening is performed with the bolt by a plurality of tightening jaws formed on the nut. It relates to a washer and nut for bolts that have a loosening prevention function that prevents loosening of the bolt by sequentially performing secondary tightening of the washer as the nut or bolt is tightened immediately after tightening.

In general, bolts and nuts are used as fastening mechanisms for assembling and fixing parts of various mechanical devices or structures. These bolts and nuts are screwed together and have a structure to fasten fastening objects.

The above-mentioned bolt and nut fastening structure has a structure in which mutual fastening is achieved by inserting a bolt from one side of the fastening object and coupling a nut to the bolt on the other side of the fastening object. At this time, in order to improve the fastening force of the bolt and nut and prevent loosening due to external shock and vibration, the nut is coupled to the bolt with the washer in close contact between the fastening objects before coupling the nut to the bolt.

However, in the connection structure of the bolt and nut using the above method, if external shock and vibration continuously occurs over time, the fastening force decreases, and the fastening force of the bolt and nut is gradually released, that is, the nut is loosened from the bolt. There is a problem that arises.

In order to solve the above-described conventional problems, various technologies have been proposed in the past to prevent nuts and washers from loosening from bolts.

First, as published in Republic of Korea Patent Publication No. 10-1160033 (hereinafter referred to as 'Patent Document 1'), an insertion guide groove cut into the bolt axis is formed, and the nut has a plurality of counterbore machined locks on the washer side. A technology has been proposed in which a jaw is formed and the washer has a rotation prevention protrusion inserted into the insertion guide groove and a plurality of elastic protrusions are formed along the outer circumference.

In addition, as published in Republic of Korea Patent Publication No. 10-1675982 (hereinafter referred to as 'Patent Document 2'), an upwardly convex arch-shaped groove is formed on the lower surface of the nut member, and support surfaces are formed on both sides of the groove. A technology has also been proposed in which the support surfaces are integrally fixed to both sides of the upper surface of the washer and a through hole is formed in the center so that the body of the bolt penetrates.

In addition, as published in Republic of Korea Patent Publication No. 10-2085616 (hereinafter referred to as 'Patent Document 3'), a technology including a wedge device to prevent loosening due to engagement when fastening the nut to the washer has also been proposed. .

In addition, as published in Republic of Korea Patent Publication No. 10-2048634 (hereinafter referred to as 'Patent Document 4'), a one-way gear-like inclined surface is formed on the bottom of the bolt head and the faces of the plurality of washer members and nuts facing each other. A technology to prevent loosening has also been proposed.

In addition, as published in Korean Patent Publication No. 10-1986509 and Korean Patent Publication No. 10-2209672 (hereinafter referred to as 'Patent Document 5'), a coil spring-type anti-loosening washer is included on one side of the nut. Technologies have also been proposed.

In addition, as published in Korean Patent Publication No. 10-2022-0078213 (hereinafter referred to as 'Patent Document 6'), a washer member is formed by eccentric processing and taper processing to surround the first through hole and protrude upward. A technology has been proposed in which a coupling portion is formed, and the lower portion of the inner peripheral surface of the nut member is tapered to engage the coupling portion.

However, Patent Document 1 has the disadvantage that the technical composition is quite complicated, as well as the resulting increase in production cost, and the fastening process is quite cumbersome and inconvenient.

In Patent Document 2, not only the problem of the nut member being separated from the washer when a strong fastening force is generated by screw coupling, but also the problem of the nut member being separated from the washer due to long-term vibration and impact also frequently occurred.

Patent Document 3 Additionally, when a fastening force greater than that of the wedge device provided in the washer is generated, there is a problem in that the fastening force is lost as the wedge of the wedge member collapses.

Patent Document 4, like Patent Document 1, has the disadvantage of being quite complex in its technical configuration, as well as the resulting increase in production costs, and the fastening process being quite cumbersome and inconvenient.

Patent Document 5 In addition, the production of a coil spring-type anti-loosening washer is not only quite cumbersome, but also has the disadvantage of significantly deteriorating assembly.

Patent Document 6 may have excellent coupling strength between the nut member and the washer member, but has the disadvantage that the fastening strength with the thread of the bolt is not high.

Republic of Korea Patent Publication No. 10-1160033 Republic of Korea Patent Publication No. 10-1675982 Republic of Korea Patent Publication No. 10-2085616 Republic of Korea Patent Publication No. 10-2048634 Republic of Korea Patent Publication No. 10-1986509 Republic of Korea Patent Publication No. 10-2209672 Republic of Korea Patent Publication No. 10-2022-0078213

The specific technical problem of the present invention to solve the above-described conventional problems is that when the nut is connected to the washer by screwing the bolt, the bolt is first tightened by a plurality of tightening jaws formed on the nut. The object is to provide a washer and nut for bolts that have a loosening prevention function that prevents loosening of the bolt by sequentially performing secondary tightening of the washer as the nut or bolt is tightened.

Another specific problem to be solved by the present invention is to enable the nut according to the screw connection to have a higher fastening force.

The specific technical solution of the present invention for solving the above-described specific technical problem is a washer and nut for bolts with a loosening prevention function, which engages one side of the nut and one side of the fastening object in contact with each other on the upper and lower surfaces to prevent loosening. Each first anti-loosening serration is formed to prevent loosening, and the insertion hole into which the bolt is inserted is formed with a tapered inclined surface in the shape of a diamond, but the direction in which the bolt is inserted is curved ( A washer that is formed in a curved shape and is flattened as a fastening object when screwed together with a bolt or nut and has a secondary tightening force; And a plurality of tightening protrusions in the shape of a diamond corresponding to the inclined surface of the insertion hole are formed between a plurality of cut grooves formed at predetermined intervals on the outer periphery of the fastening hole in the direction in which the bolt is inserted, wherein the plurality of tightening protrusions are It includes a nut that is formed to have a diameter wider than the diameter of the insertion hole and is primarily tightened to the thread of the bolt while being inserted into the inclined surface of the insertion hole.

The first outer diameter on the upper side and the second outer diameter on the lower side of the plurality of tightening protrusions are formed to have a diameter that is wider than the inner and outer diameters of the insertion hole.

The thread formed on the nut includes extending to the inner surface of the plurality of tightening protrusions.

A second anti-loosening serration is formed on one surface of the nut where the plurality of tightening protrusions are formed to engage with the first anti-loosening serration of the washer to prevent loosening.

The plurality of tightening protrusions may be formed in an even number, and the tightening protrusions between one and the other may be formed to have a thickness greater than the thickness of each tightening protrusion located between them.

In the present invention, when tightening a bolt by screwing, when the nut is coupled with a washer, the first tightening with the bolt is performed by a plurality of tightening jaws formed on the nut, and then the second tightening of the washer is sequentially performed by tightening the nut or bolt. By preventing the bolt from loosening while losing, it has the effect of securing high reliability of the product through a simple technical configuration rather than a complex technical configuration, and assembly is also easy by screwing without any hassle or inconvenience. There are also effects that can be achieved.

In addition, by allowing the nut due to the screw connection to have a higher fastening force, it also has the effect of fundamentally preventing loosening of the nut itself.

1 is an exploded perspective view and partial cross-sectional view for explaining the present invention;
2 is a cross-sectional view illustrating the state of use of the present invention;
Figure 3 is a plan view and a side cross-sectional view for explaining another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings as follows, but the present invention is not limited or limited by the examples.

Figure 1 is an exploded perspective view and a partial cross-sectional view for explaining the present invention, and Figure 2 is a cross-sectional view for explaining a state of use of the present invention.

As shown and described in the technology behind the invention, the fastening structure of the bolt 10 and the nut 30 is formed by inserting the bolt 10 from one side of the fastening object 100. ) has a configuration in which mutual fastening is achieved by screwing the nut 30 to the bolt 10 on the other side. At this time, in order to improve the fastening force of the bolt 10 and the nut 30 and prevent loosening due to external shock and vibration, the washer 20 is placed in close contact between the fastening objects 100 before coupling the nut to the bolt. Attach the nut to the bolt.

However, in the connection structure of the bolt and nut using the above method, if external shock and vibration continuously occurs over time, the fastening force decreases, and the fastening force of the bolt and nut is gradually released, that is, the nut is loosened from the bolt. There is a problem that arises.

In order to solve this problem, various types of nuts and washers with anti-loosening functions have been proposed as in Patent Documents 1 to 6, but they have the disadvantage that the technical configuration is quite complicated and the production cost increases as a result. Along with this, the fastening process has the disadvantage of being quite cumbersome and inconvenient.

In addition, the problem of the nut member being separated from the washer when a strong fastening force is generated by screw coupling, as well as the problem of the nut member being separated from the washer due to vibration and impact over a long period of time, also frequently occurred.

In the present invention, when tightening a bolt by screwing, when the nut is coupled with a washer, the first tightening with the bolt is performed by a plurality of tightening jaws formed on the nut, and then the second tightening of the washer is sequentially performed by tightening the nut or bolt. The aim is to provide washers and nuts for bolts that have a loosening prevention function to prevent loosening of bolts while losing.

The specific technical configuration of the washer 20 and nut 30, which have a loosening prevention function after being screwed to the bolt 10 with the fastening object 100 in between according to the present invention, is as follows.

The washer 20 engages with one surface of the fastening object 100 and one surface of the nut 30, which are in contact with each other on the upper and lower surfaces, and each first anti-loosening serration 22 is formed to prevent loosening. The insertion hole 24 into which the bolt 10 is inserted is formed with a tapered inclined surface 24A in the shape of a diamond, but the direction in which the bolt 10 is inserted is formed in a curved shape that goes in and protrudes to the opposite side. When the bolt 10 is screwed together with the nut 30, it is flattened with the fastening object 10 and has a secondary tightening force.

In other words, the washer is formed in a curved shape rather than a general flat shape, so when the washer is screwed by a nut with the thread of a bolt with the fastening object in between, the curved washer is flattened and comes into close contact with one side of the fastening object and the nut. At the same time, each first loosening prevention serration formed on the upper and lower surfaces of the washer is engaged to prevent loosening due to vibration or impact.

In particular, when the washer is tightened and flattened in a curved form by screwing with a nut or bolt, the insertion hole shrinks while being flattened, thereby providing an even higher tightening force when a plurality of tightening protrusions formed on the nut, which will be described later, are inserted. By having this, it fundamentally prevents the nut from loosening from the bolt thread.

In addition, as each first loosening prevention serration formed on the upper and lower surfaces of the washer engages with the surface in contact with the fastening object and the nut, loosening due to vibration or impact is prevented again.

The operation and effect of the above-mentioned washer was first explained as having a secondary tightening force when screwed with a bolt using a nut, which will be described later.

The nut 30 has an inclined surface 24A of the insertion hole 24 between a plurality of cut grooves 34A formed at predetermined intervals on the outer periphery of the fastening hole 24 in the direction in which the bolt 10 is inserted. A plurality of tightening protrusions 34 of corresponding diamond shapes are formed, and the plurality of tightening protrusions 34 are formed with a diameter wider than the diameter of the insertion hole 24, so that the inclined surface 24A of the insertion hole 24 is formed. It has a technical configuration in which it is primarily tightened to the thread of the bolt (10) as it is inserted.

In the above, the first outer diameter (W1) on the upper side and the second outer diameter (W2) on the lower side of the plurality of tightening protrusions (34) are the inner and outer diameters (w1) (w2) of the insertion hole (24). It is desirable to be able to have a greater clamping force as it is formed into a wider diameter.

In addition, the screw thread formed on the nut 30 extends to the inner surface of the plurality of tightening protrusions 34, so that not only the nut has a tightening force, but the plurality of tightening protrusions are also inserted into the insertion hole of the washer with smooth screw engagement. This allows it to have excellent tightening power.

In other words, the plurality of tightening protrusions formed on the outer periphery of the fastening hole of the nut have a diameter wider than the diameter of the insertion hole formed in the washer, so that when the plurality of tightening protrusions are inserted into the insertion hole of the washer, they are primarily attached to the bolt. After being tightly engaged with the threads and tightened, it can be fastened and secured with a higher fastening force due to the screw connection.

That is, the plurality of tightening protrusions formed on the nut are inserted into the insertion hole of the washer, and at the same time, the plurality of tightening protrusions are tightened and have a primary tightening force on the screw thread of the bolt.

Afterwards, the nut is screwed onto the bolt, and a plurality of tightening protrusions are fastened to the thread of the bolt with a higher tightening force.

In particular, the washer is flattened in a curved form by screwing, and the insertion hole of the washer is reduced, so that the plurality of tightening protrusions formed on the nut inserted into the insertion hole are tightened with a greater tightening force, resulting in a high fastening force. As a result, there is a condition that prevents the nut from loosening from the bolt due to vibration or impact.

Therefore, the present invention does not have a complicated technical configuration, but a plurality of tightening protrusions formed on the nut are inserted into the insertion hole of the washer and are primarily tightened to the screw thread of the bolt and screwed together, and the washer in a secondarily curved form is screwed. As the bolt is flattened due to coupling, it has a secondary tightening force, so that after the washer and nut are screwed to the bolt, it is possible to have a condition that fundamentally prevents loosening due to vibration or impact.

Moreover, the insertion hole of the washer is flattened from the curved shape due to the screw connection, and as the insertion hole shrinks, the plurality of tightening protrusions of the nut inserted into the insertion hole are tightened with a higher tightening force, resulting in a high fastening force, which prevents vibration. Even against this impact, the nut is prevented from loosening from the bolt.

In addition, each first anti-loosening serration formed on the upper and lower surfaces of the washer is tightly engaged and fixed with the nut as well as the object to be fastened, thereby further suppressing loosening.

Meanwhile, on one side of the nut 30 where the plurality of tightening protrusions 34 are formed, a second anti-loosening serration 36 is provided to engage with the first anti-loosening serration 22 of the washer 20 to prevent loosening. ) includes the formation of

That is, a corresponding second anti-loosening serration is formed on the nut in contact with the first anti-loosening serration formed on the washer, so that the two parts are engaged and fixed with each other during and after screwing, thereby preventing vibration or shock. Conditions that can further suppress loosening can also be established.

As a result, the washer and nut screwed to the bolt with the fastening object in between are interlocked and fixed, resulting in a higher fastening strength, which fundamentally prevents loosening due to vibration or impact, so that the bolt, washer, and nut High reliability can be secured.

In addition, it is desirable to form a third anti-loosening serration 12 on the underside of the head of the bolt 10 so as to engage with the fastening object 100 or the washer 20. When a washer is interposed between the fastening object and the head of the bolt, the protruding portion of the curved portion is located toward the bolt head.

This is to prevent the head of the bolt from loosening due to engagement with the fastening object through screw combination with the washer and nut.

Figure 3 is a plan view and a side cross-sectional view for explaining another embodiment of the present invention.

As shown, in the above configuration, a technical configuration is also provided in which a plurality of tightening protrusions formed on the nut can have a higher fastening force.

A plurality of tightening protrusions (34) are formed in an even number, and the tightening protrusions (34-1) between one and the other have a thickness greater than the thickness (t) of each tightening protrusion (34-2) located between them. It further includes those formed as (T). As for the plurality of tightening protrusions, six tightening protrusions are appropriate as shown. In other words, the thread of the bolt and the three points of the thick tightening protrusion are engaged first, and as the remaining three points of the thin tightening protrusion are sequentially engaged as the screw is tightened, a higher fastening force can be achieved.

In other words, by forming a tightening protrusion with a thick thickness between one of the plurality of fastening protrusions and another tightening protrusion with a thin thickness located between them, the tightening protrusion with a thick thickness is formed first in the process of insertion into the insertion hole of the washer. The tightening force is quickly applied to the thread of the bolt, and as the tightening protrusions having a thin thickness due to the screw connection sequentially exert tightening force to the thread of the bolt, they are fastened and secured to the thread of the bolt with a higher fastening force.

As a result, the plurality of tightening protrusions with a thick thickness first have a tightening force, and at the same time, the plurality of tightening protrusions with a thin thickness have a tightening force again, creating a condition for the nut itself to have excellent fastening force. By having this, conditions can be established to minimize loosening from the bolt in the nut itself.

As a result, loosening of the bolt can be prevented fundamentally by having greater tightening force on the nut as well as the washer.

10: Bolt 12: Third loosening prevention serration
20: Washer 22: First loosening prevention serration
24: Insertion hole 24A: Inclined plane
30: nut 32: fastening ball
34, 34-1, 34-2: Tightening protrusion 34A: Cut groove
100: Fastening object

Claims (5)

In bolt washers and nuts having a loosening prevention function,
A first anti-loosening serration is formed on the upper and lower surfaces of the fastening object and one surface of the nut in contact with each other to prevent loosening, and the insertion hole into which the bolt is inserted is a slope tapered in the shape of a diamond. A washer is formed in a curved shape that goes inward in the direction in which the bolt is inserted and protrudes to the opposite side, so that it is flattened as a fastening object when screwed together with a bolt and a nut and has a secondary tightening force; and
A plurality of tightening protrusions in the shape of a diamond corresponding to the inclined surface of the insertion hole are formed between a plurality of cut grooves formed at predetermined intervals on the outer periphery of the fastening hole in the direction in which the bolt is inserted. A nut is formed with a diameter wider than the diameter of the insertion hole and is primarily tightened to the thread of the bolt while being inserted into the inclined surface of the insertion hole. A washer and nut for a bolt having a loosening prevention function including a nut. According to paragraph 1,
A washer and nut for bolts having a loosening prevention function, wherein the first outer diameter on the upper side and the second outer diameter on the lower side of the plurality of tightening protrusions are formed to have a diameter wider than the inner and outer diameters of the insertion hole. . According to paragraph 1,
A washer and nut for bolts having a loosening prevention function, wherein the thread formed on the nut extends to the inner surface of the plurality of tightening protrusions. According to paragraph 1,
A washer and nut for bolts having a loosening prevention function, wherein a second anti-loosening serration is formed on one surface of the nut where the plurality of tightening protrusions are formed to engage with the first anti-loosening serration of the washer to prevent loosening. . According to any one of claims 1 to 4,
The plurality of tightening protrusions are formed in an even number, and the tightening protrusions between one and the other are formed to have a thickness greater than the thickness of each tightening protrusion located between them. A washer for bolts having a loosening prevention function. and nuts.

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