WO2003067105A1

WO2003067105A1 - Locking ring

Info

Publication number: WO2003067105A1
Application number: PCT/JP2003/001099
Authority: WO
Inventors: Ryusuke Mashima
Original assignee: Mashima Seisakusyo Co., Ltd.
Priority date: 2002-02-05
Filing date: 2003-02-04
Publication date: 2003-08-14
Also published as: AU2003208107A1; JP2003301830A

Abstract

A locking ring that is of simple construction and is easy to use, wherein plastically deforming the internal thread of a nut imparts a loosening-preventive function to the nut itself, whereby a reliable loosening-preventive effect is obtained. In a single-nut fastening structure having a main nut (4) threadedly engaged on the external thread (20) of a bolt (2) extending through fastening subject members (1); a locking ring (3) interposed between the fastening subject member and the main nut to prevent the loosening of the main nut, wherein the locking ring is made of a material having higher hardness than that of the material of the main nut, and has a pressing projection (30) formed on one surface thereof, the pressing projection being pressed at its front end against the peripheral edge of the threaded hole in the main nut to plastically deform the internal thread of the main nut.

Description

Description Lock ring Technical field

The present invention relates to a fastening technique using a port and a nut of various mechanical devices and building steel frames, and more particularly to a locking ring for preventing a nut from loosening. Background art

Bolts and nuts as fastening means may gradually loosen due to external force such as vibration, and various means have been proposed as means for preventing such nut loosening.

Conventionally, as a fastening structure using a port and a nut, a single-nut fastening structure in which a nut for final tightening is screwed into a male thread portion of the port that penetrates the member to be fastened, or a port that penetrates the member to be fastened Generally, a double nut fastening structure is used in which the nut for fastening is tightened from above the nut for final fastening screwed into the male screw portion of the nut.

In such a nut fastening structure, there is known a spring washer that is interposed between a member to be fastened and a nut for final tightening or between a nut for final tightening and a nut for locking. I have.

The spring washer uses its elasticity to press the female thread of the nut against the male thread of the bolt to prevent loosening, and the effect of preventing loosening is not sufficient. hard.

As a typical loosening prevention means, a fastening structure using a double nut using two nuts is well known. This double nut is designed so that the lock nut is tightened from the nut for final tightening screwed to the porto, so that both nuts do not loosen due to the action of tight contact and tightening. It was done.

In such a double nut, it is necessary to tighten the nuts to ensure that they are in close contact with each other.Therefore, while tightening the locking nut, rotate the nut for final tightening in the loosening direction, and tighten the nuts. They are forced to perform complicated tasks such as firmly tightening each other.

Further, if the lock nut is loosened, the function as a double nut is lost, and there is a problem that the loosening of the nut for final fastening cannot be prevented.

In the conventional double nut, the seating surface (axial end surface) of the locking nut has the same area as the seating surface of the nut for final fastening. However, due to the large contact area, the nut for final tightening rotates together with the rotation of the nut for locking, so that the nuts cannot be fastened to each other.

Therefore, in order to prevent this co-rotation, a complicated work such as turning the nut for tightening in the loosening direction while tightening the lock nut and forcibly tightening both nuts together is forced.

Conventionally, as described in, for example, Japanese Patent Application Laid-Open No. Hei 10-61645 and Japanese Patent Application Laid-Open No. Hei 11-13520, a protrusion protrudes from a peripheral portion of a screw hole on an axial end face. Lock nuts that protrude are known.

When the conventional lock nut is tightened to the final tightening nut, a protrusion protruding from a peripheral portion of the screw hole is crushed, and a threaded portion between the female screw portion of the final tightening nut and the male screw portion of Porto is tightened. This restricts the rotation of the nut for final fastening and prevents it from turning. As described above, the conventional lock nut is not a protrusion for plastically deforming the female screw portion of the final tightening nut.

In particular, since the conventional lock nut functions only when the projection is crushed, the hardness of the material must be equal to or less than the hardness of the material of the nut for final fastening.

The present invention has been made in order to solve the above-described problems, and is provided between a member to be fastened in a single nut fastening structure and a nut for final fastening, or a final fastening in a double nut fastening structure. By simply interposing between the nut for locking and the nut for locking, the female thread of the nut for final fastening or the nut for locking can be plastically deformed, and has a simple structure and simple usage. However, it is an object of the present invention to provide a locking ring in which the nut for final tightening or the nut for hooking itself has a function of preventing loosening so that a reliable loosening prevention effect can be obtained. Disclosure of the invention

In order to solve the above problem, a locking ring according to the present invention (claim 1) has a single nut fastening structure in which a nut for final fastening is screwed into a male thread portion of a bolt penetrating a member to be fastened. A locking ring interposed between the member to be fastened and the nut for final fastening to prevent loosening of the nut for final fastening, wherein the hardness of the nut is smaller than the hardness of the material of the nut for final fastening. Made of high hardness material,

On one side, the tip is pressed against the peripheral edge of the screw hole of the final tightening nut to form a pressing projection for plastically deforming the female thread of the final tightening nut.

In addition, the lock ring of the present invention (claim 2)

On the final fastening nut screwed into the male thread of the bolt penetrating the member to be fastened In a double-nut fastening structure for fastening a nut for buckling, a locking nut for preventing loosening of a fastening nut or a locking nut is interposed between the fastening nut and the locking nut. A ring,

It is formed of a material having a hardness higher than the hardness of the material of the nut for fastening or the nut for hooking,

A pressing projection is formed on one side to press the tip against the peripheral edge of the screw hole of the nut for final fastening or the nut for locking to plastically deform the female thread of the nut for final fastening or the nut for locking. Configuration.

In addition, the lock ring of the present invention (claim 3)

In a double-nut fastening structure in which a locking nut is tightened from a nut for final fastening screwed into a male thread portion of a porto penetrated through a member to be fastened, an intervening member is provided between the nut for final fastening and the nut for locking. A locking ring for preventing the nut for final tightening and the nut for lip fastening from loosening,

It is formed of a material with a hardness higher than the hardness of the material of the nut for final fastening and the nut for locking,

Pressing projections are formed on both sides to press the tip against the periphery of the screw hole of the nut for locking and the nut for locking, and to plastically deform the female thread of the nut for locking and the nut for locking. Configuration.

The locking ring according to the present invention (claim 4) is the locking ring according to claim 1, 2 or 3, wherein one or more pressing protrusions are formed.

The locking ring according to the present invention (claim 5) is configured such that the pressing projection is formed in an annular shape in the locking ring according to claim 1, 2, or 3. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view showing a single nut fastening structure according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the locking ring used in the single nut fastening structure. FIG. 3 is a bottom view of the locking ring. FIG. 4 is a partial cross-sectional view showing another example of the pressing projection of the locking ring. FIG. 5 is a partial cross-sectional view showing another example of the pressing projection of the locking ring. FIG. 6 is a partial cross-sectional view showing another example of the pressing projection of the locking ring. FIG. 7 is a partial cross-sectional view showing another example of the pressing projection of the locking ring. FIG. 8 is a bottom view showing another example of the pressing projection of the locking ring. FIG. 9 is a bottom view showing another example of the pressing projection of the locking ring. FIG. 10 is a bottom view showing another example of the pressing projection of the locking ring. FIG. 11 is a sectional view showing a double nut fastening structure according to a second embodiment of the present invention. FIG. 12 is a sectional view showing a double nut fastening structure according to a third embodiment of the present invention.

FIG. 13 is a sectional view showing a double nut fastening structure according to a fourth embodiment of the present invention. FIG. 14 is a cross-sectional view of the locking ring used in the double nut fastening structure. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings.

FIG. 1 is a cross-sectional view showing a single-nut fastening structure according to a first embodiment corresponding to claim 1 of the present invention. FIG. 2 is a cross-sectional view of a locking ring used in the single-nut fastening structure.

3 is a bottom view of the lock ring.

In this single nut fastening structure, a locking ring 3 is fitted into a port 2 penetrating through the members to be fastened 1, 1, and a nut 4 for final fastening is screwed from above. In this case, the locking ring 3 is interposed between the member 1 to be fastened and the nut 4 for final fastening so that the pressing projection 30 faces the nut 4 for final fastening.

As shown in FIGS. 2 and 3, the lock ring 3 is formed in a flat ring shape having a square cross section in which the inner diameter of the inner hole 31 is slightly larger than the outer diameter of the port 2, and one surface thereof (the bottom surface). In addition, four short-width arc-shaped pressing projections 30 are formed at the same interval along the peripheral edge of the inner hole 31.

Generally, mild steel is often used for the material of the lock ring 3, but the lock ring 3 of the present embodiment is formed of a material having a hardness higher than that of the material of the nut 4 for final fastening. I have.

Specific materials include steel (SWCH 8 ~: L0, SS400, S45C, etc.), high tension steel, stainless steel (SUS304, etc.), 'alloy steel (SCM435, etc.), titanium In addition, as long as the hardness is higher than the material of the nut 4 for final fastening, a synthetic resin such as aluminum, copper, or rigid polyvinyl chloride can be used.

Each of the pressing projections 30 protrudes integrally with the locking ring 3 and has a side surface formed in a convex arc shape as shown in FIG. 2 and a cross-sectional shape formed in a square shape. .

The number of the pressing projections 30 is not limited to four in the embodiment, but may be one, or two, three, five, six, or the like.

Further, the side surface shape of the pressing projection 30 may be square as shown in FIG. 4, and its cross-sectional shape may be a chevron shape as shown in FIG. 5, a triangular shape as shown in FIG. It can be formed in a semicircular shape as shown in FIG.

Further, the pressing projection 30 may have a long arc shape as shown in FIG. 8, a hemispherical shape as shown in FIG. 9, or an annular shape as shown in FIG. May be. In this way, if the shape is long arc or annular, the tip surface is wavy, It can be formed in a tooth shape, saw blade shape or the like.

Therefore, as shown in FIG. 1, the locking ring 3 is fitted into the port 2 penetrated through the members to be fastened 1, 1, and the final tightening nut 4 is screwed so as to face the pressing projection 30. Let me do it.

When Thereby is tightened the pressing projection 3 0 Summer preparative 4 for _c further tightened into contact with the screw hole peripheral portion of the fastening summer preparative 4, the pressing projections 3 0 of the clamping Summer preparative 4 screws The female screw portion 40 can be plastically deformed at the opening of the screw hole of the nut for final fastening 4 by being pressed against the periphery of the hole.

When the female screw portion 40 is plastically deformed in this way, the clearance between the female screw portion 40 and the male screw portion 20 of Porto 2 is lost, and the female screw portion 40 and the male screw portion 20 are firmly connected. The final tightening nut 4 itself has a function of preventing loosening because the rotation resistance of the final tightening nut 4 increases accordingly.

In particular, as a configuration for plastically deforming the female thread portion 40 of the final tightening nut 4 by the pressing force accompanying the tightening, the hardness of the material of the locking ring 3 is reduced by the material of the final tightening nut 4. The hardness is higher than the hardness.

Therefore, even if the tip of the pressing projection 30 bites into the nut 4 for final tightening, the projection 30 for pressing is not crushed, and the female screw portion 40 of the nut 4 for final tightening is securely formed. It can be plastically deformed.

Also, since the pressing projection 30 comes into contact with the final tightening nut 4, the contact area between the locking ring 3 and the final tightening nut 4 is reduced, and the tightening pressure is increased accordingly. The final tightening nut 4 can be securely tightened. Next, FIG. 11 is a sectional view showing a double nut fastening structure according to a second embodiment of the present invention.

This double nut fastening structure is composed of the male screw of Porto 2 passed through the members 1 and 1 After the nuts 4 for final tightening are screwed into the threaded portions 20 to fasten the members 1 and 1 to be fastened, the ring 3 for the hook is inserted into the bolts 2 from above the nuts 4 for final tightening, and Then, the locking nut 5 is screwed and tightened.

In this case, the locking ring 3 is interposed between the nut for final fastening 4 and the nut for locking 5 such that the pressing projection 30 faces the nut for final fastening 4.

The locking ring 3 can be configured in the same manner as in FIGS. 2 to 10 described above.

Therefore, in the double nut fastening structure shown in FIG. 11, the pressing projection 30 is pressed against the periphery of the screw hole of the nut 4 for final tightening, and the pressing force causes the opening of the screw hole of the nut 4 for final fastening. The female screw portion 40 can be plastically deformed in the portion.

Due to this plastic deformation, the final tightening nut 4 itself can have a function of preventing loosening, and even if the locking nut 5 becomes loose, the final tightening nut 4 can be prevented from loosening. However, loosening of the nut 4 for final tightening can be prevented by a simple operation of simply tightening the nut 5 for hooking. In addition, since the locking ring 3 is interposed between the nut 4 for final fastening and the nut 5 for buckling, the rotation of the locking nut 5 is not transmitted to the nut 4 for final fastening. It is possible to prevent the nuts 4 for final tightening from rotating together with the nuts 5 for fastening.

Next, FIG. 12 is a cross-sectional view showing a double nut fastening structure according to a third embodiment of the present invention.

In this double nut fastening structure, the locking ring 3 is interposed between the final tightening nut 4 and the locking nut 5 such that the pressing projection 30 faces the locking nut 5. The locking ring 3 can be configured in the same manner as in FIGS. 2 to 10 described above.

Therefore, in the double nut fastening structure shown in FIG. 12, the pressing projection 30 is pressed against the periphery of the screw hole of the locking nut 5, and the pressing force causes the screw hole of the locking nut 5 to be pressed. The female screw portion 50 can be plastically deformed at the opening.

By this plastic deformation, the locking nut 5 itself can be provided with a function of preventing loosening. As a result, the locking nut 4 can be prevented from loosening, and the locking nut 5 can be simply tightened. Looseness can be prevented by a simple operation of going.

Next, FIG. 13 is a sectional view showing a double nut fastening structure according to a fourth embodiment of the present invention, and FIG. 14 is a sectional view of a locking ring used in the double nut fastening structure. .

In this double nut fastening structure, the locking ring 3 is interposed between the nut 4 for final fastening and the nut 5 for locking such that the pressing projection 30 faces the nut 4 for final fastening and the nut 5 for locking. ing.

As shown in Fig. 14, the locking ring 3 in this case has four short-width arc-shaped pressing projections 30 on both sides (bottom surface and flat surface) along the periphery of the inner hole 31. They are formed at the same interval.

Note that the locking ring 3 can be configured in the same manner as in FIGS. 2 to 10 described above, except that the pressing projections 30 and 30 are formed on both surfaces.

Therefore, in the double nut fastening structure shown in FIG. 13, the pressing projections 30 and 30 are pressed against the screw hole peripheral edges of the nuts 4 and 5 for locking, and the pressing force is applied by the pressing force. The female screw portions 40 and 50 can be plastically deformed at the opening portions of the screw holes of the fastening nut 4 and the locking nut 5. Due to this plastic deformation, the nuts for final tightening 4 and the nuts for locking 5 themselves can be provided with a function of preventing loosening, and loosening can be prevented by simply tightening the nuts for locking 5. . Industrial applicability

As described above, according to the locking ring of the present invention, the locking nut is interposed between the member to be fastened in the single nut fastening structure and the nut for final fastening, or the locking nut and the locking nut in the double nut fastening structure. The female screw portion of the nut for final fastening or the nut for hooking can be plastically deformed only by being used between the nuts for use.

Thereby, the nut for final tightening or the nut for locking and locking itself can be provided with a function of preventing loosening while having a simple structure and a simple method of use, and a reliable loosening prevention effect can be obtained.

In addition, since the pressing projection contacts the nut, the contact area between the locking ring and the nut is reduced, and the tightening pressure is increased accordingly, so that the nut can be securely tightened.

In the case of the double nut fastening structure (Claims 2 and 3), since the locking ring is interposed between the locking nut and the final tightening nut, the rotation of the locking nut is applied to the final tightening nut. This prevents transmission and prevents the nuts for final tightening from rotating together with the nuts for locking.

Claims

The scope of the claims

1. In a single-nut fastening structure in which a nut for final fastening is screwed into a male thread portion of a bolt penetrating the member to be fastened, the nut for final fastening is interposed between the member to be fastened and the nut for final fastening. A locking ring for preventing the nut from loosening, which is formed of a material having a hardness higher than that of the material of the nut for final fastening,

On one side, a pressing projection is formed to press the tip against the periphery of the screw hole of the final tightening nut to plastically deform the female thread of the final tightening nut. Lock ring.

2. In a double nut fastening structure in which a locking nut is tightened from above a nut for final fastening screwed into a male thread portion of a bolt penetrated into a member to be fastened, the nut is interposed between the nut for final fastening and the nut for locking. A locking ring for preventing a nut for locking or a nut for locking from loosening,

It is made of a material with a hardness higher than that of the material of the nut for final fastening or the nut for locking.

On one side, a pressing projection for pressing the tip against the peripheral part of the screw hole of the nut for fastening or the nut for locking to plastically deform the female thread of the nut for fastening or the nut for locking is provided. A locking ring characterized by being formed.

3. In a double-nut fastening structure in which the locking nut is tightened from above the nut for final fastening that is hinged to the male thread of the bolt that has penetrated the member to be fastened, between the nut for final fastening and the nut for locking. A locking ring that is interposed to prevent loosening of the nut for fastening and the nut for closing.

It is formed of a material having a higher hardness than the material of the nut for final fastening and the nut for locking.

On both sides, attach the tip to the periphery of the screw hole of the nut for final fastening and the nut for locking. A locking ring, characterized in that a pressing projection is formed for pressing and plastically deforming a female thread portion of the nut for final fastening and the nut for locking.

4. The locking ring according to claim 1, 2 or 3, wherein one or more pressing protrusions are formed.

5. The locking ring according to claim 1, 2 or 3, wherein the pressing projection is formed in an annular shape.