JPS5923117A - Locking nut - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention relates to a locking nut.

Conventionally, this 4.4t nut is, for example, ii'G.
As shown in Figure 1, the outer end is caulked from several places on the outer periphery to the center in the radial direction so that the thread flank surface body protrudes toward the center, or as shown in Figure 2, it is crushed from both sides to the center in the radial direction. It has been proposed to have an elliptical shape, or to fit a separate locking device made of nylon or the like, as shown in FIG.

However, in the case of the conventional nuts shown in Figures 1 and 2, the locking mechanism is applied by interfering with the flank surface of the bolt (not shown) to prevent loosening during tightening, which causes the phenomenon of burning. This is likely to occur, and the stress distribution during tightening becomes unbalanced, and in many cases, a screwing torque higher than the torsional strength of Pole 1 is required for fitting and tightening. There were 1 and 4 incidents of destruction.

/ Moreover, in the case of the nut crushed into a 100 yen shape in Figure 2,
When tightening, the stress distribution is unbalanced and fatigue of the bolt +171 is likely to occur.

On the other hand, in the nut manufacturing process, a separate process is required to swage the outer periphery and form the thread flank surface, which hinders mass production and increases costs.

On the other hand, the conventional nut shown in Fig. 6 has the drawback that the nylon locking stopper body is susceptible to heat, and since the locking stopper is a separate piece, it requires two hours to assemble. (That was the cause.)

This invention solves the conventional problems such as those mentioned in t71J. The screw thread fork surface of the nut is not deformed and has a standard shape, and a convex portion is partially formed at the center in the radial direction at the screw ejection end that is continuous with the screw thread fook surface,
To provide a nut which prevents the convex part from loosening by forming a plastic liquid form and interfering with the root part of the bolt screw when the convex part is fastened to the bolt.

A sixth embodiment of the invention will be described with reference to the drawings.

In FIGS. 4 and 5, the female screw threaded portion 11 of the hexagonal nut 10
The screw thread front face 12 is made into a standard/l/S shape, and a convex portion is formed partially in the radial center and circumferential direction at the screw exit end 1 which is continuous with the X screw thread front face, In addition, the original curved portion is provided in the entire axial direction of the nut.

The operation and effect when the bolt 20 is screwed into this oak (lo) will be explained with reference to FIG. Natsuto 10 and Pol l-20
f: When screwed together, the convex portion 13 of the inner diameter portion of the bolt is deformed from the bottom 21 of the core bolt as shown in the figure since the hardness is lower than that of the bolt 20. That is, in the illustrated thread 1''='A, the deformed portion of the tip 13 of the nut 10 is present at the root 21 without any gap, thereby acting to prevent loosening.

Therefore, the threaded surface 12 of the nut 10 of the present invention is made into the standard shape as it is, and the convex part 15 is provided at the tip.
Since the nut is partially deformed into a convex shape in the radial center and circumferential direction, and the convex part is provided all over the axial direction of the nut, it is possible to eliminate the drawbacks of the conventional bolt, namely, the increased screw-in torque when screwing the bolt together. ◇Currently, hexagonal nuts are cold forged #)j+! ! ＋I'm bored, but I'm disappointed in this invention! t to create
1. A punching pin for punching the inner diameter part of a nut can be processed simply by shaping it into the shape of the nut of the present invention.

Also, for nut thread forming, a tap with an angle of 11°1'i, which is the same shape as the nut threaded part, is required at the bottom of the tapped thread crest in order to form the entire convex part in the tapping process. Publicly known] -i J+! So 1ha? Compared to known locking nuts, there is no need for a caulking process and the product can be manufactured at a lower cost.

Considering the first forming process when forming the convex part in the clipping process, it is better to have the same half-direction glide resistance in the 1800 direction, so the protrusion should be 111 Delicious.

In FIG. 7 showing another embodiment, the threaded surface 12 of the nut 10 has a standard shape, and a convex portion 16 is provided at the threaded end continuous with the threaded surface in the radial center and circumferential direction. and the convex portion is provided in the axial direction only at the mantissa screw firing end near the outer end of the one-way nut.

Therefore, when tightening the nut 10 and bolt 20, the bolt 20
The screw root 21 is plastically deformed to prevent it from loosening, which reduces the risk of burning during fastening, creates a uniform stress distribution in the circumferential direction, and prevents damage to the holes (Bo/L/) 20. Nisu (
It can be manufactured at a low cost since there is no need for a 9-item caulking process or assembly process.

In the nut 10 of Naoike's embodiment, the first few rotations of the nut 10 when screwed into the bolt 20 are at the bottom 21 of the bolt 20.
Since it does not interfere with the convex portion 16 of the bolt 20, the tightening work can be done quickly, and since there is less interference with the bottom 21 of the bolt 20, the occurrence of burning with the bolt 20 is further reduced.

[Brief explanation of the drawing]

21T Figure 1 is a front view of a well-known screw nut with thread flanks protruding from several places on the outer periphery toward the center in the radial direction. A front view of a known locking nut having a protrusion, Figure 6: A partial longitudinal section of a known locking nut fitted with a nylon charcoal stopper (Part 1, Figure 4) , this 1-10:;Front view of the locking nut of the invention of fl.
5 is a partial vertical side view of FIG. 4, FIG. 6 is an enlarged partial cross-sectional view taken along the line ■-■ in FIG. 4, and FIG. 7 is a partial vertical side view of another embodiment of this invention. Figure 8121 is a partially enlarged cross-sectional view of the nut of the present invention fitted into the hole/L'l-. 10...Nut; 11...1 fitting portion; 12...Funk surface; 13...Convex portion of screw protrusion end. Patent applicant SA'A Co., Ltd.

Claims (3)

[Claims] (1) A convex portion is partially formed at the end of the screw which is continuous with the thread flank face having a standard shape, and when the bolt is fastened, the convex portion is plastically deformed into the bolt thread valley J. Loosening guide to prevent interference 〇 (2) The screw outlet end continuous with the thread flank surface having a standard shape is formed into a partially convex part in the radial center and circular direction, and the convex part is provided all over the axial direction of the nut. , The locking nut according to the special YF 'd4 ice range 0), which interferes with the bottom of the bolt thread in the convex part by plasticity and shape when N-connected with the bolt. (3) A patent in which a convex portion is partially provided in the axial direction of the nut only at the tip of a plurality of screws near the outer end of the tip of the screw 111 that is continuous with the threaded surface having a standard shape. i? +'f range of the locking nut described in item (1).