JPH08170626A - Thread part structure - Google Patents

Abstract

PURPOSE: To easily realize the structure of a thread part hard to loosen by providing an uneven part at one or both thread faces of an external thread and an internal thread. CONSTITUTION: The uneven face 30 is provided at the thread face of at least one or both of an external thread 10 and an internal thread 20 screwed with the external thread 10. In the case of the uneven part 30 being thus provided at one thread face, the mutual thread faces of the external thread 10 and internal thread 20 become hard to slide compared to the mutual screwing of the conventional smooth thread faces, so that a thread part becomes hard to loosen. In the case of both thread faces of the external thread 10 and internal thread 20 being provided with the uneven parts 30 engaged with each other, the thread part becomes further hard to loosen by the engagement between the uneven part 30 of the external thread 10 and the uneven part 30 of the internal thread 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a screw portion having a male screw and a female screw which are screwed together.

[0002]

2. Description of the Related Art For fastening various articles, for example, a means including a bolt and a nut, or a bolt and a threaded member formed with a female screw for screwing the male screw of the bolt, that is, a male screw There is means by screwing with a female screw. The conventional male screw and female screw have smooth thread surfaces.

[0003]

In such screwing with the smooth screw surface, there is a possibility that loosening may occur due to various load stresses, vibrations and the like. In order to prevent this, various known loosening prevention means had to be separately provided.

The present invention has been made in view of such circumstances, and an object thereof is to provide a structure of a screw portion in which a male screw and a female screw are hard to be loosened by a simple structure. Is.

[0005]

Means for Solving the Problems In order to solve the above problems, the means adopted by the present invention will be described with reference to the reference numerals used in the drawings. 1
0 or a structure of a threaded portion characterized in that a concavo-convex portion 30 is provided on at least one threaded surface of the female screw 20 screwed to the male screw 10. "

[0006] Next, the invention of claim 2 is characterized in that "uneven portions 30 that engage with each other are provided on the screw surfaces of both the male screw 10 and the female screw 20 screwed to the male screw 10. And the structure of the screw part ".

Next, the invention of claim 3 is that "the female screw 2
0 is formed in the nut 21, and the nut 21 is divided into two. The structure of the screw portion according to claim 1 or 2.

[0008] Finally, the invention of claim 4 is that "the female screw 20 is formed in the nut 21, and the tool tip portion of the male screw 10 is formed with a tool engaging portion formed in a shape capable of engaging with a tool. Four
0 is provided ". The screw structure according to any one of claims 1 to 3.

The tool engaging portion 40 has such a form that a tool can prevent the rotation of a member on the male screw 10 side when the nut 21 screwed to the male screw 10 is rotated. For example, a hexagonal wrench (for inserting a hex wrench), a hexagonal socket for inserting a wrench (for installing a wrench), a minus Driver can be engaged (like a minus driver can be inserted)
It may be in any form such as a groove or a projecting piece with which the pliers can be engaged (which can be grasped by the pliers).

[0010]

The structure of the screw portion according to the present invention thus constructed operates as follows.

First, in the structure of the threaded portion according to the first aspect of the present invention, since the concavo-convex portion 30 is provided on the threaded surface of at least one of the male screw 10 and the female screw 20, the conventional smoothed screw surface is obtained. Compared with screwing together, the screw surfaces of the male screw 10 and the female screw 20 are less likely to slip, and the screw portions are less likely to loosen.

Next, in the structure of the screw portion according to the second aspect of the present invention, since the threaded surfaces of both the male screw 10 and the female screw 20 are provided with the concave and convex portions 30 which engage with each other, the male portion is formed. Uneven portion 30 of screw 10 and uneven portion 30 of female screw 20
Due to the engagement with, the screw part becomes even more difficult to loosen.

Next, in the structure of the screw portion according to the third aspect of the present invention, the female screw 20 is formed on the nut 21, and the nut 21 is divided into two parts. The screwing work of 21 becomes easy.

If the concavo-convex portion 30 is provided on the thread surface of one of the male screw 10 or the female screw 20, or if the concavo-convex portion 30 is provided on the screw surfaces of both the male screw 10 and the female screw 20, the corresponding amount of the screw is screwed. Since the frictional force of the portion increases, when the nut 21 is screwed onto the male screw 10, the torque required to rotate the nut 21 relative to the male screw 10 also increases, which complicates the work. . In particular, when feeding the nut 21 over a long distance with respect to the male screw 10, the work becomes very complicated. Therefore, if the nut 21 is divided into two as in the invention of claim 3, even if the nut 21 is not sent over a long distance with respect to the male screw 10, the nut 21 is disassembled and the male screw 10 is disassembled. Since it becomes possible to install the nut 21 in a portion where the nut 21 is finally screwed, the nut 2 for the male screw 10
The screwing work of No. 1 becomes easy.

When the halved nut 21 is united and screwed to the male screw 10, stress is applied to the threaded portion, so that the halved nut 21 thus joined is fixedly held to the male screw 10. However, there is a possibility that the halved nut 21 that has been combined may be disassembled due to vibration or shock. Therefore, it is desirable to fix the halved nuts 21 that are combined so as not to be disassembled, as in the embodiment described later.

Finally, in the structure of the screw portion according to the invention of claim 4, the female screw 20 is formed in the nut, and the male screw 1
Since the tool engaging portion 40 formed in a shape capable of engaging with a tool is provided at the screw tip portion of No. 0, the work of screwing the nut 21 onto the male screw 10 is facilitated for the following reasons.

In the structure of the threaded portion of the present invention, as described above, when the nut 21 is screwed onto the male screw 10,
The torque required to rotate the nut 21 relative to the male screw 10 increases. Therefore, the torque for rotating the nut 21 is increased by a spanner or the like, and the member on the male screw 10 side may be carelessly rotated.
Therefore, for example, when the male screw 10 is applied to the bolt 11, it is necessary to fix the head of the bolt 11 with a wrench or the like and rotate the nut 21 with a wrench or the like. Sometimes it cannot be fixed. In this case, if the tool engaging portion 40 formed in a shape capable of engaging the tool is provided at the screw tip portion of the male screw 10 as in the invention of claim 4, the tool at the screw tip portion of the male screw 10 is provided. It is possible to rotate the nut 21 with the spanner while engaging the tool with the engaging portion 40 and fixing the member on the male screw 10 side with the tool so as not to rotate. That is, from the mounting side of the nut 21 (the tip side of the male screw 10), the fixing of the member on the male screw 10 side and the nut 21
It is possible to rotate and. Therefore, the male screw 10
The screwing operation of the nut 21 with respect to is easy.

[0018]

Embodiments of the structure of the screw portion according to the present invention will now be described in detail with reference to the drawings.

First, FIGS. 1 and 2 show an embodiment of the structure of the screw portion according to the present invention. In this example,
Although the example in which the structure of the threaded portion of the present invention is adopted for the male screw 10 of the bolt 11 has been shown, the male screw 10 may be the bolt 11
It is not limited to those formed in. Also, male screw 1
The example in which the wavy uneven portion 30 is provided on the screw surface of 0 is shown, but the shape of the uneven portion 30 is not limited to this, and may be, for example, a groove shape as shown in FIG. Also, FIG.
As shown in FIG.

Next, FIGS. 5 and 6 show another embodiment of the structure of the screw portion according to the present invention. In this embodiment, an example in which the structure of the threaded portion of the present invention is adopted for the female screw 20 of the nut 21 is shown, but the female screw 20 is not limited to the one formed on the nut 21, and for example, various types can be used. It may be a female screw 20 formed on a member to be screwed to which the bolt 11 or the like is screwed, which is a member that constitutes a component of the machine. Further, although an example in which the wavy uneven portion 30 is provided on the thread surface of the female screw 20 is shown, the shape of the uneven portion is not limited to this, and for example, as shown in FIG. Alternatively, it may have a projecting shape as shown in FIG.

Although the embodiments of the structure of the threaded portion according to the present invention have been described above, in the structure of the threaded portion according to the invention of claim 1, at least one of the male thread 10 and the female thread 20 has a threaded surface. The uneven portion 30 as described above may be provided.

In the structure of the threaded portion according to the second aspect of the present invention, it is sufficient that the threaded surfaces of both the male screw 10 and the female screw 20 are provided with the uneven portions 30 that engage with each other. Specifically, when the wavy uneven portion 30 as shown in FIG. 2 is provided on the thread surface of the male screw 10, the wavy uneven portion 30 of the male screw 10 is engaged with the thread surface of the female screw 20. It is sufficient to provide the wavy uneven portion 30 as shown in FIG. 6, and in the case where the groove-shaped uneven portion 30 as shown in FIG. The projection-shaped concave-convex portion 30 as shown in FIG. 7 that engages with the groove-shaped concave-convex portion 30 of the male screw 10, and the convex-shaped concave-convex portion as shown in FIG. When 30 is provided, the threaded surface of the female screw 20 engages with the projection-shaped uneven portion 30 of the male screw 10, and the groove-shaped or projection-shaped uneven portion 30 as shown in FIG. 7 or 8.
Should be provided.

In each of the embodiments, the male screw 10 is used.
Alternatively, an example is shown in which concavo-convex portions are provided on both upper and lower screw surfaces of the female screw 20, but the structure of the screw portion according to the present invention is not limited to this, and the frictional force at the screw portion is not limited to this. The working screw surface is one of the screw surfaces on the upper side or the lower side in the drawing depending on the stress applied to the screw portion, so that it is sufficient if the uneven portion 30 is provided on the screw surface on the side to which the frictional force is applied.

On the other hand, FIG. 9 shows an embodiment of the structure of the screw portion according to the invention of claim 3. In the structure of this screw portion, the member on the female screw 20 side is a nut 21, and this nut 21 is divided into two parts. The final screw 21 of the male screw 10 is screwed into the nut 21. The nut 21 that has been divided into pieces is united, and the nut 21 is screwed to the male screw 10.

In addition, the halved nut 21 that has been combined is
Since it is not firmly fixed as it is, for example, as shown in FIG. 10, it is advisable to apply fixing tools 23 and 24 for fixing the halved nuts 21 that are combined. Specifically, the fixture 23 having a fitting hole 23a that fits over the entire outer circumference of the nut 21 is provided from above the nut 21 (the nut 21 is divided into two parts).
When the fixing tool 23 is attached to the male screw 10 before being combined with each other, it may be attached to the nut 21 (from below) to prevent the combined nut 21 from being separated. Alternatively, a fixture 24 having a sandwiching portion 24a that sandwiches two opposite sides of the nut 21 may be attached from the side of the nut 21 to prevent the combined halved nuts 21 from separating. .

In these cases, for example, in the fixture 23 having the fitting hole 23a fitted to the entire outer periphery of the nut 21, the fitting hole 23a is provided with the projection 23b, and the nut 21 is fitted to the projection 23b. It is preferable to provide an engaging hole 23c that engages with the projection 23b of the fixture 23 and the engagement hole 23c of the nut 21 so that the fixture 23 mounted on the nut 21 is not easily removed. Further, for example, a fixture 24 including a holding portion 24a that holds two sides of the nut 21.
In this case, a protrusion 24b that engages with the other side of the nut 21 is provided at the tip of the holding portion 24a, and the protrusion 24b of the fixture 24 is provided.
It is preferable that the fixing tool 24 mounted on the nut 21 is not easily pulled out by the engagement between the fixing tool 24 and the other side of the nut 21.

Further, when the fixing tools 23 and 24 are applied in this way, if a part of the outer circumference of the nut 21 is exposed from the fixing tool, the nut 21 to which the fixing tools 23 and 24 are mounted is wrenched by a wrench or the like. It can be rotated, which is convenient.

Finally, FIGS. 11 to 14 show an embodiment of the structure of the screw portion according to the invention of claim 4. In the structure of this screw portion, the member on the female screw 20 side is a nut 21 (not shown), and the tool engaging portion 40 is provided at the screw tip portion of the male screw 10. Here, the tool engaging portion 40 is
It is sufficient if the tool can prevent the member on the male screw 10 side from rotating when the nut 21 is screwed onto the male screw 10. Specifically, FIG.
1, a hexagonal hole into which a hexagon wrench can be inserted, a hexagonal protrusion into which a spanner can be attached, as shown in FIG. 12, and a flat-blade screwdriver as shown in FIG. Examples thereof include a groove that can be fitted, or a protrusion that can be held by pliers as shown in FIG.

[0029]

As described above in detail, the structure of the threaded portion of the present invention has unevenness on at least one of the male and female threaded surfaces, or on both the male and female threaded surfaces. This is provided by increasing the frictional force between the screw surfaces of the male screw and the female screw of the screw portion.

Therefore, according to the present invention, it is possible to provide the structure of the screw portion in which the male screw and the female screw are not easily loosened with a simple structure.

Particularly, in the structure of the screw portion according to the invention of claim 3, a female screw is formed in a nut, and this nut is divided into two, whereby the nut is screwed to the male screw. The work can be simplified.

Further, in the structure of the screw portion according to the invention of claim 4, a female screw is formed in the nut, and a tool engaging portion is provided at the screw tip portion of the male screw. It is possible to simplify the screwing work of the nut.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the structure of a screw portion according to the present invention.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 is a partial side view showing another embodiment of the structure of the screw part according to the present invention.

FIG. 4 is a partial side view showing another embodiment of the structure of the screw part according to the present invention.

FIG. 5 is a vertical sectional side view of another embodiment of the structure of the screw part according to the present invention.

6 is an enlarged view of part B in FIG.

FIG. 7 is a vertical sectional partial side view showing another embodiment of the structure of the screw part according to the present invention.

FIG. 8 is a partial side view in vertical section showing another embodiment of the structure of the screw part according to the present invention.

FIG. 9 is a vertical sectional side view showing an embodiment of the structure of the screw portion according to the invention of claim 3;

10 is a partial perspective view showing a means for fixing the nut shown in FIG.

FIG. 11 is a partial perspective view showing an embodiment of the structure of the screw part according to the invention of claim 4;

FIG. 12 is a partial perspective view showing another embodiment of the structure of the screw part according to the invention of claim 4;

FIG. 13 is a partial perspective view showing another embodiment of the structure of the screw part according to the invention of claim 4;

FIG. 14 is a partial perspective view showing another embodiment of the structure of the screw part according to the invention of claim 4;

[Explanation of symbols]

 10 Male screw 11 Bolt 20 Female screw 21 Nut 23 Fixing tool 23a Fitting hole 23b Protrusion 23c Engaging hole 24 Fixing tool 24a Clamping part 24b Protrusion 30 Uneven part 40 Tool engaging part

Claims (4)

[Claims] 1. A structure of a screw portion, wherein an uneven portion is provided on at least one screw surface of a male screw or a female screw screwed with the male screw. 2. A structure of a threaded portion, wherein projections and depressions engaging with each other are provided on the threaded surfaces of both the male screw and the female screw screwed to the male screw. 3. The structure of the threaded portion according to claim 1, wherein the female screw is formed in a nut and the nut is divided into two parts. 4. The nut is formed with the female screw, and a tool engaging portion formed in a shape capable of engaging with a tool is provided at a screw tip portion of the male screw. The structure of the screw part according to claim 3.