JPH0968212A - Nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a nut to be tightened strongly enough so that it does not loosen by forming a thread groove in the middle of the nut along its axis that can be threaded by fastening achieved by the rotation of the upper part of the nut. SOLUTION: This nut 1 has an outer peripheral surface formed into a hexagonal shape, is as high as almost two normal nuts, and has a thread groove 2 formed in its middle along its axis that can be threaded by fastening achieved by the rotation of the upper part of the nut. When the nut is fitted around a bolt and threaded, the groove 2 is destroyed and deformed, a tensile force works between a rotating part 3 above the groove 2 and a tightening part 4 below the rotating part 3, and the rotating part 3 works in a manner similar to a locknut. If the width I1 of the groove 2 is small, when the groove 2 is destroyed and deformed to bring the rotating part 3 into contact with the tightening part 4, the destroyed and deformed part 5 extends almost along and meshes with the thread of the bolt 6; if the width I1 of the groove 2 is large, the destroyed and deformed part 5 meshes with the thread of the bolt 6 while deforming the thread. Therefore, the nut is completely detained.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention belongs to the technical field of nuts.

[0002]

2. Description of the Related Art Since nuts use the meshing of threads, they are inevitably loosened due to vibration. There are several methods to prevent this, but a lock nut is generally used. The lock nut is tightened and then further screwed. By applying a projecting tension between the nut and the nut that has been tightened first to prevent rotation, loosening is prevented.

However, if the lock nut is tightened and yet another lock nut is screwed on, the number of members is increased and the work is troublesome, and the management of the nut is also complicated.

Also, no matter how the lock nut is, it is difficult to prevent it completely from rotating, and there are some places where the lock nut is insufficient depending on the place of use, and a nut that can be tightened firmly without loosening at any place is desired. It is rare.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a nut that does not require another member such as a lock nut and can exert a sufficient tension force for a long period of time. .

The means therefor will be described with reference to FIG. 1 of the embodiment. The structure is such that a threaded groove 2 is formed at an intermediate portion in the axial direction of a nut 1 so that the nut 1 can be threaded with a deadline by rotating the upper part. It is a nut 1.

[0007] Specifically, for example, the thread cutting groove may be formed in a concave shape or an approximately V shape from the outer peripheral surface toward the inner side, or from the outer peripheral surface toward the inner side. The upper side surface of the threaded groove may be formed in the shape of an umbrella, which becomes higher toward the inner peripheral side while being formed toward the inside.

Further, in order to facilitate the rotation of the nut, the shape or size of the outer peripheral surfaces of the upper part and the lower part may be discontinuous with the threaded groove as a sakai.
For example, the upper portion and the lower portion may be formed in a polygonal shape, and the corner portions of both may be offset in the circumferential direction, or a flange portion may be provided at the lower end of the upper portion so as to project in the circumferential direction.

[0009]

According to the above construction, when the upper part of the nut is rotated and completely tightened, the threaded groove portion at the intermediate portion is threaded and fractured and deformed, and the upper part of the threaded groove approaches or contacts the lower part. Then, a tension force is generated between the upper part and the lower part to prevent rotation. When the threaded groove is formed from the inner peripheral side, the threaded portion forms a rough surface, and a good detent is provided in the state where the projecting tension acts. Also, when the threaded groove is formed from the outer peripheral side,
The thread-cutting groove portion to be broken and deformed bites the thread of the bolt along the thread of the bolt or while deforming the thread of the bolt, and here also a good detent is achieved.

By using this nut, it is not necessary to separately screw two nuts as in the conventional case, but these two nuts can be screwed at once. Moreover, by only tightening the upper part of the nut and screwing it off, the rotation-locking action that occurs when the lock nut is tightened is automatically performed, so tightening work is extremely easy and the nut itself can be handled as a single lock. It is easy because you only have to handle the nut.

Further, since the surface between the upper part and the lower part of the thread cutting groove is broken and deformed by the thread cutting, the broken and deformed portion is pressed against the pressure contact surface as compared with the case where the conventional lock nut is screwed. Surface resistance occurs. Therefore, a stronger detent can be achieved, and a higher detent effect can be obtained than in the conventional case.

When the threaded groove is formed from the outer peripheral side as in the second, third, and fourth aspects, the threaded portion bites into the thread of the bolt as described above, so that a positive and strong protrusion is achieved. The tension can be applied for a long period of time, and a good anti-rotation effect can be obtained.

When the threaded groove is formed in a substantially V-shape as in claim 3, a concentrated load of the deadline is applied to the deepest part of the cut which becomes the apex which draws V time, Since the parts are fractured and deformed in sequence, a strong projecting tension that does not bite into the thread of the bolt and does not fluctuate in order from that part can be obtained, and a high anti-rotation effect can be obtained.

As in the case of claim 4, when the upper side surface of the thread cutting groove is formed in an umbrella shape whose inner peripheral side is higher,
When the thread groove is threaded, the threaded portion is pushed inward by the upper surface of the thread groove and a force is applied in a direction that bites the thread of the bolt, so that even stronger biting is performed.

Further, according to the fifth, sixth and seventh aspects of the present invention, the shape or size of the outer peripheral surface of the upper part and the lower part is discontinuous with the threaded groove as the sakai, so that when the nut is rotated. Since it can be applied only to the upper part, it is possible to prevent the wrong use, that is, to directly apply the rotational force to the lower part of the threaded groove, and the work can be performed easily and surely.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of the nut 1.
Is for obtaining a tight tightened state with a simple operation. The outer peripheral surface is hexagonal, the height is higher than that of a normal nut, and it is formed to a height of about two pieces. At an intermediate portion in the axial center direction, a threaded groove 2 that can be threaded with a deadline by rotating the upper part 2 Is formed. Then, when screwed into a bolt and threaded, the portion of the thread cutting groove 2 is destroyed and deformed, and the rotating portion 3 above the thread cutting groove 2 (upper part of the nut 1) and the lower side of the thread cutting groove 2 (lower part of the nut 1). It is configured such that the protruding tension acts on the tightening portion 4 and the rotating portion 3 on the upper portion functions similarly to the lock nut.

As shown in FIG. 2, the above-mentioned thread cutting groove 2 is formed in a concave shape from the outer peripheral surface toward the inner side. The width 1 of the thread cutting groove 2 may be appropriately set so as to enable thread cutting, but different effects can be obtained by this difference.

That is, when the width l ₁ of the thread cutting groove 2 is narrow as shown in FIG. 3, when the screw cutting groove 2 portion is broken and deformed and the rotating portion 3 and the tightening portion 4 come into contact with each other, the breaking deformation portion 5 is formed.
Substantially bites along the screw thread of the bolt 6, but when the width l ₂ of the thread cutting groove ₂ is wide as shown in FIG. 4, the breaking deformation portion 5 deforms the screw thread of the bolt 6 and Eat the 6 screw thread.

With the breaking and deforming portion 5 biting into the thread of the bolt 6, as described above, the projecting tension acting between the rotating portion 3 and the tightening portion 4 and the breaking and deforming portion 5 biting cause Complete detent is made.

Further, not only the distance between the thread-cutting grooves 2 but also the effect can be obtained depending on the shape. For example, as shown in FIG. 5, the upper side surface 2a and the lower side surface 2 of the thread cutting groove 2 are
b (particularly the upper side surface 2a) is shaped like an umbrella that becomes higher toward the inside,
If the breaking and deforming portion 5 is deformed as described above, the upper surface 2 of the threaded groove 2 is formed so as to be inclined while being parallel.
a presses the breaking deformation portion 5 toward the thread of the bolt 6. Therefore, it is possible to positively bite the thread of the bolt 6, and it is possible to apply a strong protruding tension between the rotating portion 3 and the tightening portion 4.

Further, as shown in FIG. 6, when the thread cutting groove 2 is formed in a substantially V shape, the concentrated load of the deadline is applied to the deepest cut portion which is the apex of the V shape, and the deformation is sequentially destroyed from that portion. Since the portion 5 is formed, a strong projecting tension that does not bite and fluctuates in the thread of the bolt 6 in order from that portion can be applied between the rotating portion 3 and the tightening portion 4, and a high anti-rotation effect can be obtained. .

At this time, if the upper side surface 2a of the threaded groove 2 is formed in an umbrella shape as shown by the phantom line in FIG.
At the same time, the same action and effect as in the case shown in FIG. 5 can be obtained, and the synergistic action of these can provide a stronger detent.

The threaded groove 2 is, for example, as shown in FIG.
~ It may be formed as shown in FIG. Each has its own effect based on the above operation.

Further, the tightening portion 4 may have any shape as long as it remains even if the breaking deformation portion 5 is formed, and the shape thereof is not limited to the hexagonal shape. For example, it may be formed in a cylindrical shape. Therefore, for example, in FIG.
The nut 1 in which the tightening portion 4 and the threaded groove 2 as shown in FIG.

Further, as shown in FIG. 12, if the threaded groove 2 is formed in two places at the upper and lower sides, two breaking deformation portions 5 can be obtained and a strong detent can be achieved. The thread groove 2,
Two may be three, and in these cases, the depth of the threaded groove 2 may be appropriately set so that the threaded groove 1 on the lower side is sequentially threaded.

Furthermore, the threaded groove 2 may be formed not only in the inner side direction from the outer peripheral surface but also in the inner side surface as shown in FIG. At this time, if the width of the threaded groove 2 from the inner side is set to be large and the threaded groove 2 on the outer peripheral surface is formed narrow, it is possible to prevent the fracture deformation portion 5 from entering the inner threaded groove 2 and coming out at the time of thread cutting. . In addition, the mutual joint surface between the rotating portion 3 and the tightening portion 4 becomes a rough surface, and even if the fracture deforming portion 5 bites into the thread of the bolt 6, a good detent is provided under the condition that the protrusion tension acts. .

The nut 1 is usually rotated by using a box wrench (not shown), but in consideration of the operability at the time of this rotating operation, the nut 1 is constructed as shown in FIGS. preferable. That is, the rotating portion 3 above the nut 1
The outer peripheral surface and the size and the size of the lower tightening portion 4 are discontinuous. In the nut 1 of FIG. 14, the rotating portion 3 and the tightening portion 4 are formed in a hexagonal shape, and
Rotating both corners in the circumferential direction, the upper rotating part 3
Only the box wrench fits in. This makes it possible to easily rotate only the rotating portion 3.

In the nut 1 shown in FIG. 15, a collar portion 7 is provided in a circumferential direction at the lower end of the rotating portion 3 above the nut 1.

In the nut 1 of FIG. 16, the corners of the rotating portion 3 and the tightening portion 4 are the same, but the sizes are different so that the rotational force can be input only to the upper rotating portion 3. There is. When the rotating portion 3 is made larger as shown in the drawing, a strong rotating force can be applied to the tightening portion 4, so that thread cutting can be performed smoothly and strongly.

[Brief description of drawings]

FIG. 1 is a perspective view of a nut.

FIG. 2 is a sectional view of a nut.

FIG. 3 is an explanatory diagram of an operating state.

FIG. 4 is an explanatory diagram of an operation state.

FIG. 5 is an explanatory diagram of a working state.

FIG. 6 is an explanatory diagram of a working state.

FIG. 7 is a front view of the nut.

FIG. 8 is a front view of the nut.

FIG. 9 is a front view of the nut.

FIG. 10 is a front view of the nut.

FIG. 11 is a partial sectional front view of the nut.

FIG. 12 is a front view of the nut.

FIG. 13 is a partial sectional front view of the nut.

FIG. 14 is a perspective view of a nut.

FIG. 15 is a perspective view of a nut.

FIG. 16 is a perspective view of a nut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Nut 2 ... Thread cutting groove 2a ... Upper side surface 3 ... Rotating part 4 ... Tightening part 5 ... Destruction deformation part 7 ... Collar part

Claims (7)

[Claims] 1. A nut having a threaded groove formed at an intermediate portion in the axial direction of the nut, the threaded groove being threaded by a cut-off by rotating the upper part. 2. The nut according to claim 1, wherein the threaded groove is formed in a concave shape from the outer peripheral surface toward the inner side. 3. The nut according to claim 1, wherein the threaded groove is formed in a substantially V shape from the outer peripheral surface toward the inner side. 4. The thread cutting groove is formed from the outer peripheral surface toward the inner side, and the upper side surface of the thread cutting groove is formed.
The nut according to claim 1, wherein the nut is formed in an umbrella shape that becomes higher toward the inner peripheral side. 5. The shape or the size of the outer peripheral surfaces of the upper part and the lower part are discontinuous with the threaded groove as a Sakai.
The nut according to any one of claims 4 to 5. 6. The nut according to claim 5, wherein the upper portion and the lower portion are formed in a polygonal shape, and the corner portions of both are offset in the circumferential direction. 7. The nut according to claim 5, wherein a flange portion is provided at the lower end of the upper portion so as to project in the circumferential direction.