JP2020094629A - Rotation stop structure and manufacturing method of the same - Google Patents

Abstract

To fix a bolt and a nut in a proper state.SOLUTION: A rotation stop structure includes: a plate material 2 having a seating surface 11 on which a bottom surface 10 of a head 6 of a bolt 4 or a bottom surface of a nut is seated; a rotation stop part 8 which is formed by bending the plate material to the side of the seating surface and is placed in contact with a side surface 9 of the head of the bolt and a side surface of the nut; and a recessed part 15 which is formed at an inner corner part at a bending part 12 of a root of the rotation stop part and formed by recessing the seating surface.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a detent structure and a manufacturing method thereof, and more particularly, to a structure for detenting a bolt or a nut when attaching the same or a manufacturing method thereof.

For example, when a through hole is provided in the plate material and the bolt is fixed by inserting the through hole, the plate material may be bent and used as a rotation stopper for the bolt.

Japanese Utility Model Publication No. 62-6514

However, when the plate material is bent, a rounded portion may be formed at the inner corner of the bent portion. The rounded portion projects from the seating surface of the plate member on which the head of the bolt is seated. Therefore, the head portion of the bolt comes into contact with the rounded portion, making it impossible to make a clean surface contact with the seating surface, so that the bolt cannot be fixed in an appropriate state. Similar problems occur when nuts are used instead of bolts.

Then, this indication is created in view of such a situation, and the objective is to provide the rotation stop structure which can fix a bolt or a nut in a proper state, and its manufacturing method.

According to one aspect of the present disclosure,
A plate member having a seating surface on which the bottom surface of the bolt head or the bottom surface of the nut is seated,
A detent portion formed by bending the plate member toward the seating surface and abutting on a side surface of the head portion of the bolt or a side surface of the nut,
A recess formed in the inner corner portion of the bent portion at the base of the rotation stopping portion, the recess being formed by recessing the seating surface;
There is provided a detent structure characterized by including.

Preferably, the detent structure further includes a through hole which is provided on the seating surface and through which the shaft portion of the bolt or the shaft portion of the bolt screwed into the nut is inserted.

According to another aspect of the present disclosure,
A plate member having a seating surface on which the bottom surface of the head of the bolt or the bottom surface of the nut is seated is bent toward the seating surface, and the detent that is brought into contact with the side surface of the head of the bolt or the side surface of the nut A first step of forming a section,
A second step of forming a recess formed by recessing the seating surface by a striking process in an inner corner portion of the bent portion at the base of the rotation stopping portion;
There is provided a method for manufacturing a detent structure, comprising:

Preferably, the manufacturing method further includes a third step of providing the seating surface with a through hole through which the shaft portion of the bolt or the shaft portion of the bolt screwed into the nut is inserted.

According to the present disclosure, bolts or nuts can be fixed in an appropriate state.

It is a perspective view showing a bracket before attaching a bolt. It is a perspective view showing a bracket after attaching a bolt. It is a side view which expands and shows a bolt attachment part. It is a principal part enlarged view of FIG. It is sectional drawing which shows the manufacturing method of a rotation stop structure. It is a side view which expands and shows the bolt attachment part of a modification.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the present disclosure is not limited to the embodiments below.

In the following, a rotation preventing structure for preventing rotation of the bolt when the bolt is attached to the bracket made of a plate material will be described. The bracket of this embodiment is a vehicle component. 1 shows the bracket before mounting the bolt, and FIG. 2 shows the bracket after mounting the bolt. Further, FIG. 3 shows the bolt mounting portion in an enlarged manner.

As shown in the figure, the bracket 1 is formed by bending a relatively thick metal plate material 2 by pressing or the like. The bracket 1 is provided with a through hole 3 penetrating the plate member 2, and the shaft portion 5 of the bolt 4 is inserted into the through hole 3. The bolt 4 is a hexagonal bolt, and has a hexagonal head portion 6 and a shaft portion 5 provided with a male screw. 1 and 2 are views seen from the front side, on the back side of the bracket 1, as shown in FIG. 3, the nut 7 is fastened to the shaft portion 5 until it comes into contact with the bracket 1. As a result, the bolt 4 is fixed to the bracket 1. A female screw to which the male screw of the shaft portion 5 is screwed is provided on the inner peripheral portion of the nut 7.

When tightening the nut 7, the rotation or rotation of the bolt 4 must be stopped. Therefore, the detent portion 8 is formed on the bracket 1. The rotation stopping portion 8 is formed by bending an end portion of the plate material 2 adjacent to the through hole 3 at a right angle. As a result, the anti-rotation portion 8 can be easily formed. The bending angle does not necessarily have to be a right angle.

The rotation stopping portion 8 is brought into contact (specifically, surface contact) with one of the six flat side surfaces 9 of the head 6 of the bolt 4. The side surface 9 forms a rotation stop surface on the bolt 4 side.

When the bolt 4 is fixed as shown in FIGS. 2 and 3, the bottom surface 10 of the head portion 6 facing the plate material 2 side is seated on the seating surface 11 of the plate material 2 facing the head portion 6 side. The seating surface 11 of the plate member 2 is formed on the front surface of the plate member 2. Both the bottom surface 10 of the head portion 6 and the seating surface 11 of the plate member 2 are flat surfaces. As will be described in detail later, the bottom surface 10 and the seating surface 11 are in clear surface contact with each other by the configuration of this embodiment.

When the plate member 2 is bent toward the seating surface 11 and the detent portion 8 is bent, a bent portion 12 that is bent at a right angle is formed at the base of the detent portion 8. Then, when this bending process is performed, normally, as shown by an imaginary line in FIG. 4, a rounded portion 14 having a predetermined curvature radius is formed in the inner corner portion 13 of the bent portion 12. Particularly when the plate material 2 has a relatively large thickness as in the present embodiment, the formation of the rounded portion 14 is remarkable.

However, the rounded portion 14 projects from the seating surface 11 toward the bolt head 6 side. As a result, the bolt head 6 comes into contact with the rounded portion 14 and cannot make a smooth surface contact with the seating surface 11, and the bolt 4 cannot be fixed in an appropriate state or posture. That is, the bottom surface 10 of the bolt head 6 slightly tilts with respect to the seating surface 11, floats from the seating surface 11, and comes into linear contact with the seating surface 11. The central axis of the bolt 4 slightly tilts with respect to the central axis of the through hole 3, and the bolt 4 is fixed in a tilted state.

In this case, since the bottom surface 10 of the bolt head 6 is not firmly seated on the seating surface 11, problems such as the bolt 4 becoming easy to loosen occur. If the degree of inclination is large, the appearance will be poor.

Therefore, in order to solve such a problem, in the present embodiment, the inner corner portion 13 of the bent portion 12 is provided with a recess 15 formed by recessing the seating surface 11.

By providing this recess 15, the rounded portion 14 protruding from the seating surface 11 can be eliminated. Therefore, the above problem caused by the presence of the rounded portion 14 can be solved. That is, the bottom surface 10 of the bolt head 6 can be brought into clean surface contact with the seating surface 11, and the bolt 4 can be fixed to the through hole 3 coaxially. Therefore, the bolt 4 can be stably fixed in a proper state for a long period of time.

Although various methods of forming the recess 15 can be considered, in the present embodiment, the recess 15 is formed by a strike process. According to this, the concave portion 15 can be formed at the same time when the detent portion 8 is bent, and the concave portion 15 can be easily formed.

FIG. 5 is a diagram showing a method of manufacturing the rotation stopping structure of the present embodiment. The plate member 2 is arranged on the spring pad 16 with the front (front) surface side up and the back (back) surface side down, and while the side portions are constrained by the bending die 17, the plate punch 2 is moved upward by the bending punch 18. Is pressed from. Then, as the bending punch 18 moves downward, the plate material 2 is bent by the bending die 17 to form the detent portion 8 and the bending portion 12. A projection 19 is formed on the lower end surface of the bending punch 18 and on the end on the side of the bending die 17, and the projection 19 crushes the seating surface 11 to form a recess 15. In this way, the recess 15 is subjected to a strike process, and is formed at the same time as the detent 8 and the bent portion 12.

By this striking process, springback in which the bending angle opens after bending is suppressed. Although the striking process is originally used for the purpose of suppressing such springback, the present embodiment is characterized in that the striking process is also used for the purpose of eliminating the rounded portion 14 and forming the recess 15 in addition to this purpose. ..

The through holes 3 are formed by piercing at the same time as the trimming of the plate material 2 when the plate material 2 before bending such as the detent 8 is still flat. However, the order can be set arbitrarily and may be formed after the detent portion 8 is bent. The through hole 3 may be formed by drilling.

As shown in FIG. 4, the recess 15 of the present embodiment is such that no inner wall 13 of the bent portion 12 is formed with any bulge protruding toward the bolt head 6 side from the seating surface 11. The flat contact surface 20 of the detent 8 that comes into surface contact with the side surface 9 of the bolt head 6 is located closer to the bolt head 6 side in the plate thickness direction than the positions of the bottom surface 10 and the seating surface 11. Extends to P. As a result, the remaining portion of the bottom surface 10 of the bolt head 6 excluding the portion facing the recess 15 can be brought into surface contact with the seating surface 11, and at the same time, the entire side surface 9 of the bolt head 6 is prevented from rotating. The contact surface 20 of the portion 8 can be brought into surface contact.

Next, a modified example will be described. The same parts as those in the above embodiment are designated by the same reference numerals in the drawings, and the description thereof will be omitted.

In the modification shown in FIG. 6, the relationship between the bolt 4 and the nut 7 is reversed, and a rotation stop structure is applied to prevent the nut 7 from rotating. The nut 7 is a hexagonal nut and is attached to the front side of the plate material 2. The bolt 4 is inserted into the through hole 3 from the back side of the plate material 2, screwed into the nut 7, and tightened.

The nut 7 abuts on the bottom surface 21 that is seated (specifically, surface contact) on the plate member 2 or the seating surface 11 of the bracket 1 and the abutment surface 20 of the rotation stopping portion 8 of the bracket 1 (specifically, the surface). Contacting side surface 22. Each of these surfaces is a flat surface. Six side surfaces 22 are formed to form a rotation stop surface on the nut 7 side.

Also in the present embodiment, the concave portion 15 can prevent the nut 7 from tilting, and the bottom surface 21 of the nut 7 can be brought into good surface contact with the seating surface 11. Then, the bolt 4 can be fixed to the through hole 3 coaxially. As a result, the nut 7 can be stably fixed in a proper state for a long period of time.

Although the embodiments of the present disclosure have been described above in detail, the present disclosure can be applied to the following other embodiments.

(1) For example, the bolts may be bolts other than hexagonal bolts. For example, the head of the bolt may have a polygonal shape (quadrangle or the like) other than the hexagonal shape, or may have a shape in which a part of a circle is cut out straight. The same applies to nuts.

(2) The recess 15 may be formed by a method other than the striking process, for example, a cutting process. Further, even in the case of the striking process, it may be formed in a process different from the bending process of the rotation stopping portion 8.

(3) For example, in the embodiment shown in FIG. 3, another member may be sandwiched and fixed between the nut 7 and the back surface of the bracket 1. That is, the bolt 4 and the nut 7 may be used to fix another member to the bracket 1.

(4) The plate material does not have to form the bracket, and may form the casing, for example.

The embodiments of the present disclosure are not limited to the above-described embodiments, and all modifications, applications, and equivalents included in the concept of the present disclosure defined by the claims are included in the present disclosure. Therefore, the present disclosure should not be construed as limited, and can be applied to any other technique belonging to the scope of the idea of the present disclosure.

2 Plate Material 3 Through Hole 4 Bolt 5 Shaft 6 Head 8 Rotation Stop 9 Side 10 Bottom 11 Seating Surface 12 Bent 13 Inner Corner 15 Recess

Claims (4)

A plate member having a seating surface on which the bottom surface of the head of the bolt or the bottom surface of the nut is seated,
A detent portion formed by bending the plate member toward the seating surface and abutting on a side surface of the head portion of the bolt or a side surface of the nut,
A recess formed in the inner corner portion of the bent portion at the base of the rotation stopping portion, the recess being formed by recessing the seating surface;
Non-rotating structure characterized by having. The detent structure according to claim 1, further comprising a through hole that is provided on the seating surface and through which a shaft portion of the bolt or a shaft portion of a bolt screwed into the nut is inserted. A plate member having a seating surface on which the bottom surface of the head of the bolt or the bottom surface of the nut is seated is bent toward the seating surface, and the detent that is brought into contact with the side surface of the head of the bolt or the side surface of the nut A first step of forming a section,
A second step of forming a recess formed by recessing the seating surface by a striking process in an inner corner portion of the bent portion at the base of the rotation stopping portion;
A method for manufacturing a rotation stopping structure, comprising: The manufacturing method of the whirl-stop structure according to claim 3, further comprising a third step of providing a through hole, through which the shaft portion of the bolt or the shaft portion of the bolt screwed into the nut is inserted, on the seating surface. ..

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