JPS604374B2 - loosening nut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking nut, and more particularly, to a locking nut that can be formed so that it will not loosen naturally during use due to vibrations or the like after being fastened to a desired location.

Conventionally, there are many locking devices and structures for nuts, but none of them have a complete locking effect, or their shapes and structures are complex, making them difficult to manufacture and cost-effective. There was a point.

The present invention has been improved in view of these points. The present invention provides the following features: One side of the head of the nut, that is, the supporting surface;
Alternatively, a curved (concave) support surface that can be easily formed on both sides is formed, and the nut body is made of a piece that gives elasticity, so that when fastened to a required location, the support surface is curved. It is an object of the present invention to provide a nut in which the opposing surfaces and the supporting surface are crimped so that a significant tension state is maintained and a release torque for loosening which is much greater than the torque required for fastening is obtained. .

The present invention also provides a V-groove that can be easily formed on one side or both sides of the support surface of the nut, extending from the outer edge of the nut to the green part around the screw hole, thereby improving the elasticity of the support surface. The object of the present invention is to provide a nut that can increase the releasing torque more than the tightening torque by smoothing the action, thereby producing a locking action.

The present invention also provides that when the nut equipped with the locking mechanism is fastened to a required location, when the support surface begins to flex, the nut is deflected from the outer edge of the nut toward the center of the thread. To provide a nut in which the flanks of the threads of a mating bolt, etc. and the flanks of the threads of the main nut forcefully engage each other, and the entire engaging threaded part is in a state of coupling force, thereby producing a locking action. It is in.

Embodiments of a nut equipped with a locking mechanism according to the present invention will be described below with reference to the drawings.

1 and 2 show a double-sided threaded hexagonal nut body 1 as an embodiment of the present invention.

The nut body 1 has a threaded portion 2 and has a structure in which elasticity is imparted to the nut body by stealing the flesh of the head of the nut, that is, the supporting surface, that is, a depth of 7 from the outer edge 3 of the nut to the circumferential portion 5 of the screw hole.
A curved (truncated conical) support surface 4 is provided, and a V-shaped groove is formed on the support surface 4 horizontally on the surface extending from the outer edge 3 of the nut to the peripheral edge 5 of the screw hole. part 3 to depth 8,
It is formed of an integral piece with V-grooves 6 having an angle of 60 to 120 degrees arranged radially at equal intervals. In the modification of the nut shown in FIGS. 1 and 2 shown in FIGS. 3 and 4, the nut body la is provided with a threaded portion 2a, and the nut body la is provided with a threaded portion 2a, as described above, to provide elasticity to the nut body. is granted,
That is, a curved (parallel chevron-shaped) support surface 4a with an inclination of depth 7a from the outer edge 3a of the nut to the upper end of the V-groove 6a.
and a V-shaped groove on the outer edge 3a of the nut on the support surface 4a.
The outer edge portion 3 is horizontally extended on the surface extending to the circumferential portion 5a of the screw hole.
A V-groove 6a having a depth of 8a and an angle of 60 to 120 degrees is formed in a shape that bisects the two-strip support surface 4a.

The subscript a corresponds to the corresponding code of each part in the example that does not have the subscript a. The embodiments and modifications of the nut according to the present invention have been described above, and the structural applications of the present nut will be described in more detail.

Honey-curved support surface 4 provided on the nut body 1 according to the present invention
The nut body 1 is constructed by removing the flesh of the supporting surface, thereby imparting elasticity to the nut body 1. When this nut, which has a V-groove 6 for smoothing the elastic effect, is tightened at a predetermined location with a given torque, the nut protrudes upward from the outer edge 3. However, pressure is applied to the peripheral edge 2 of the screw, and when the surface of the structure and the main nut are crimped, not only is a strong tension state maintained, but also the flexing action causes the flank of the thread of the main nut and the mating bolt, etc. The flanks of the screw strongly adjoin each other and are locked together, creating a locking action, and when comparing the torque required to tighten the nut and the torque required to release it, the release torque has a much larger ratio characteristic. It will be a mechanism that allows you to obtain. However, the thickness of the nut body 1 is not so thin or the depth 8 of the V-groove 6 is not so deep that it bends upward beyond its elastic limit when the nut is fastened to a required location. Whether a higher release torque can be obtained as desired compared to the given fastening torque depends on the depth 7 of the slope of the support surface 4 formed on the nut body 1, the angle of the V groove 6, and the angle of the V groove 6. In addition to the number, a major factor is to structurally investigate the relationship between this and the surface of the structure that it faces.

The inventor conducted experiments with standard test equipment using various nuts manufactured in accordance with the nuts shown in the drawings, and found that the most desirable holding tension and release torque were achieved when the given tightening torque was applied. It was found that the combination of numerical values of each part where characteristics occur has a constant basic value depending on the nominal diameter of the nut.

According to this experiment, the depth 7 of the inclination of the support surface 4 should be formed in the range of 0.01 to 0.10 of the nominal screw diameter for nuts of various sizes, and increases with the nominal diameter. was found to be the most desirable.

For example, in the case of a hexagonal nut with an IQ pitch of 1.5 legs, which is the most commonly used nominal diameter, the slope depth 7 of the support surface 4 should be formed in the range of 0.3 to 0.5 ribs. was found to be desirable.

It was also found that when the depth 7 of the inclination is increased, the holding tension increases with respect to the fastening torque, but the releasing torque decreases. In addition, in the case of a hexagonal nut with 8 ribs and a pitch of 1.25, the slope depth 7 is 0.25 to 0.4.
It was found that it is desirable to form it on the 5th side. Regarding the number of V-grooves 6, 3 to 12 strips may be formed radially on the support surface 4 at approximately equal intervals, and the angle of the V-grooves 6 is preferably 60 to 120 degrees using nuts of various sizes. I understand.

For example, in the case of a hexagonal nut with a nominal flea size of 8 and a diameter of 1 mm, it has been found that it is desirable to form 3 to 6 V-grooves 6, and it is generally sufficient to increase the number with the nominal diameter, however, as shown in Fig. 3. and V in the nut of the modification shown in Fig. 4.
The number of slots may be common to nuts of each nominal diameter, and two threads may be formed in a shape that bisects the support surface 4a. Further, the curved support surface and the V-groove according to the present invention may be formed on one side, except for the problem of determining the direction when fastening them, but they may be formed on both sides.

In addition, in the case of this type of locking nut, it is desirable to be able to withstand reuse approximately 5 times commercially, but according to this experiment, even when reused more than 5 times with a given tightening torque, the release torque and holding tension are still high. It was found that it still maintains its characteristics without significantly changing from when it was first used.

The experimental examples described above are concrete explanations based on the dimensions and explanations of the shell parts mentioned above, but they will also change depending on the type and properties of the metal that is the manufacturing member. Needless to say, the characteristics of the present invention can still be maintained even in this case.

It goes without saying that the present invention can be modified and changed in various ways without departing from its purpose and still retain its advantages. As is clear from the above description, in a nut embodying the principles of the present invention, an inclined surface is formed on the support surface, and the support surface is recessed in a substantially curved shape, and when the nut is fastened, the nut body is To produce a nut that has elasticity and has multiple V-grooves radially recessed on the support surface to achieve stress concentration when tightening the nut, it is made from a single piece of material using a conventional ordinary head-forming machine. It can be manufactured continuously and in large quantities.

[Brief explanation of the drawing]

Fig. 1 is a side view of the nut of the present invention and an embodiment showing a part of the nut in cross section; Fig. 2 is a plan view taken along line A-A in Fig. 1 in the direction of the arrow; FIG. 4 is a side view similar to FIG. 1 of a modification of the nut shown in FIG. 1, and FIG. 4 is a plan view taken along line B--B in FIG. 3 in the direction of the arrow. 1... Nut, 2... Screw, 3... Outer edge, 4...
...Curved support surface, 5...Threaded pilot hole, 6...V groove, 7...depth of inclination, 8...depth of V groove, H...thickness of nut. Fig. 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A sloped surface is formed by stealing the flesh from the outer edge to the inner edge of the nut supporting surface, and the supporting surface is recessed in a substantially curved shape to provide elasticity within a range that does not exceed the elastic limit when tightening the nut. 1. A locking nut characterized by having a plurality of V grooves provided on the nut body and radially recessed on the supporting surface so that stress concentration can be obtained when the nut is fastened. 2. The locking nut according to claim 1, wherein the V-groove is recessed at an angle of 60 to 120 degrees.