JPS6214414Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to loose nuts.

A locking nut that prevents loosening by interfering with the male thread of the bolt when tightening the nut onto the bolt, is provided with an interfering protrusion extending in an arc shape in the circumferential direction with a predetermined center angle, A locking nut is known in which at least two annular flat plates made of spring material are used as interference members, and these annular flat plates are fitted and fixed into recesses formed at the ends of the nut.

However, in this type of nut,
During use, the annular flat plate slides in the circumferential direction and tends to shift position, and as a result, the interference protrusions formed on the multiple annular flat plates are out of phase, reducing the interference force, causing not only loosening but also improper alignment with the bolt. This results in inconveniences such as not being able to be screwed together.

This invention eliminates the above-mentioned conventional disadvantages by fitting and fixing a plurality of annular flat plates used as interference members of a non-loosening nut into the recesses of the nut without shifting their positions, and adjusting the phase of the interference protrusions. It is an object of the present invention to provide a locking nut that can always maintain proper phase and obtain a large interference force.

Embodiments of this invention will be described below with reference to the drawings.

1 and 2, 1 is a nut body, and a plurality of annular flat plates 2A, 2B, 2 are formed in a recess 1b formed on the opposite side of the seat surface 1a by means described later.
C is fitted, and the upper end of the peripheral wall 1c surrounding the recess 1b is curled inward to form the annular flat plates 2A, 2.
B and 2C are fixed to the nut body 1.

The annular flat plates 2A, 2B, and 2C are made of a spring material with a high yield point such as spring steel, and the plate thickness t is 1/3 of the female thread of the nut body 1, as shown in FIGS. 3 and 4. The interference protrusion 3 is set at a pitch, and the interference protrusion 3 is extended in an arc shape in the circumferential direction with a predetermined central angle θ (approximately 90 to 110 degrees), and the curvature of the inner end surface 3a of the interference protrusion 3 is approximately the same as that of the nut body. It is set equal to the inner diameter of 1.

The annular flat plates 2A, 2B, 2C have a central angle θ
A locking protrusion 4 that protrudes toward one side in the thickness direction, that is, toward the bottom, is formed on the outer periphery on the bisector C that divides into two equal parts. Then, from this locking protrusion 4, cut out the outer periphery at a position displaced to one side in the circumferential direction by an angle obtained by dividing 360° by the number of overlapping of the annular flat plates 2A, 2B, and 2C, that is, 360°/3 = 120°. A locking portion 5 is formed.

The width w ₁ of the locking portion 5 is set to be somewhat larger than the width w ₂ of the locking protrusion 4 so that the locking protrusion 4 can be engaged with the locking portion 5 .

On the other hand, the bottom surface _1b1 of the recess 1b of the nut body 1 is provided with a locking recess 6 of a size that allows the locking protrusion 4 formed on the annular flat plate 2A to be engaged without rattling.

In order to fix the three annular flat plates 2A, 2B, and 2C to the nut body 1, first see Figures 5a and 5.
As shown in figure b, the locking protrusion 4 of the first annular flat plate 2A is engaged with the locking recess 6 formed in the bottom surface 1b1 of the recess 1b of the nut body ₁ , and is placed on the bottom surface _1b1 . .

Next, as shown in Figures 6a and 6b, the second
The locking protrusion 4 of the annular flat plate 2B is connected to the first annular flat plate 2.
The second annular flat plate 2B is superimposed on the first annular flat plate 2A while being engaged with the locking portion 5 of A.

Furthermore, as shown in FIGS. 7a and 7b, the third
The locking protrusion 4 of the annular flat plate 2C is connected to the second annular flat plate 2.
The third annular flat plate 2 is engaged with the locking part 5 of B.
C is polymerized onto the second annular flat plate 2B.

In this way, by sequentially superposing the annular flat plates 2A, 2B, and 2C, the interference projections 3 formed on each of the annular flat plates 2A, 2B, and 2C are inevitably arranged with a phase of 120°, and moreover, During this time, the engagement between the locking protrusion 4 and the locking part 5 and the engagement between the locking protrusion 4 and the locking recess 6 prevent positional displacement. Therefore, the annular flat plates 2A, 2B, and 2C can always maintain proper positions to accommodate bolts (not shown) without slipping in the circumferential direction.

When the nut body 1 is screwed onto a bolt, the interference protrusion 3 is elastically compressed in a direction perpendicular to the axis of the bolt, and the male thread of the bolt is interfered with by the reaction, causing the nut body 1 to rotate. It exerts an anti-loosening effect against external forces.

Furthermore, by screwing the nut body 1 together, the interference protrusion 3 is deformed along the helical curve of the bolt male thread, and the interference protrusion 3 in the front part in the tightening direction is bent downward and tightens the bolt male thread. The interference protrusion 3 of the rear part is bent upwards to make strong contact with the upper flank and bottom of the thread of the external thread. Therefore, the elastic interference protrusions 3 exert strong compressive interference in the perpendicular direction and the vertical direction centering on the flank from both sides of the male threaded portion of the bolt, thereby exerting a strong loosening prevention effect.

The degree of interference is arbitrarily adjusted by the radial length of the interference protrusion 3, the positional relationship with respect to the male thread, and the size of the center angle θ. In addition, since the elastic deformation due to the interference effect is small and within the elastic limit, even if the nut body 1 is repeatedly used,
The anti-loosening effect does not decrease.

In the above embodiment, three annular flat plates 2A, 2B,
Although I am explaining an example using 2C,
As shown in FIGS. 8 and 9, a locking nut using two annular flat plates 2A ₁ and 2B ₁ can be obtained. In this case, the angle obtained by dividing 360° from the locking protrusion 4 by the number of overlaps of the annular flat plates 2A ₁ and 2B ₁ , that is,
By forming the locking portion 5 at a position displaced by 360°/2=180°, it is possible to use it as shown in the drawings, and the same locking effect as in the above embodiment is achieved.

As explained above, according to this invention, it is possible to accurately prevent the sliding of the annular flat plate during use, so that the interfering protrusions of each annular flat plate are always held in the proper position and large interference forces are prevented. Furthermore, by preparing annular flat plates of the same shape and size and stacking them one after another, the appropriate position of the interference protrusion can be easily obtained, which has advantages such as good workability.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the locking nut according to this invention, FIG. 2 is a plan view thereof, FIG. Figure 5a is a longitudinal cross-sectional view showing the state in which the first annular flat plate is assembled into the nut, Figure 5b is a plan view of the same, and Figure 6a is a longitudinal cross-sectional view showing the state in which the first and second annular flat plates are assembled. Fig. 6b is a plan view of the same, Fig. 7a is a vertical sectional view showing a state in which three annular flat plates are assembled, Fig. 7b
The figure is a plan view of the same, and FIGS. 8 and 9 are explanatory diagrams of other embodiments. 1... Nut body, 1b... Recess, 1b ₁ ... Bottom surface, 2A, 2B, 2C... Annular flat plate, 3... Interference protrusion, 4... Locking protrusion, 5... Locking part, 6 ...Latching recess.

Claims (1)

[Scope of utility model registration request] A plurality of annular flat plates 2A, 2B, and 2C are stacked and fixed in the recess 1b at the end of the nut body 1, respectively,
Interference protrusions 3 are provided on these annular flat plates 2A, 2B, 2C.
In the non-loosening nut, a locking recess 6 is provided in the bottom surface _1b1 of the recess 1b, and each of the annular flat plates 2A, 2B, and 2C has a predetermined center angle θ in an arc shape in the circumferential direction. An interfering protrusion 3 is extended, and a locking protrusion 4 that protrudes to one side in the thickness direction of the annular flat plate is formed on the outer periphery of the interference protrusion 3 on the bisector C of the central angle. The locking portion 5 is formed by cutting out the outer peripheral portion displaced to one side in the circumferential direction by an angle obtained by dividing 360° by the number of overlapping of the annular flat plates.
The locking protrusion 4 of the annular flat plate 2A is engaged with the locking recess 6 to position the first annular flat plate 2A on the bottom surface _1b1 of the nut body 1, and the second annular flat plate 2B and thereafter Then, the locking protrusions 4 of each of the annular flat plates stacked on the first annular flat plate 2A are engaged with the locking parts 5 formed on the annular flat plates located earlier in the stacking order, so that a predetermined number of A non-loosening nut characterized by stacking annular flat plates such that their interfering protrusions 3 correspond to each other in a predetermined phase.