CN112727896A

CN112727896A - Elastic self-locking nut

Info

Publication number: CN112727896A
Application number: CN202110069818.9A
Authority: CN
Inventors: 李鹏飞; 李祥臣; 李光泽
Original assignee: Shenyang Boyan Railway Vehicle Fittings Co ltd
Current assignee: Shenyang Boyan Railway Vehicle Fittings Co ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-04-30

Abstract

The invention discloses an elastic self-locking nut which comprises a threaded body, an upper nut and a lower nut, wherein one end of the lower nut is provided with a convex elastic taper sleeve and is assembled in a concave taper sleeve rabbet of the upper nut, threaded inner holes are respectively arranged in the upper nut and the lower nut, and the axial lead of the threaded inner hole is superposed with the axial leads of the taper sleeve rabbet and the elastic taper sleeve.

Description

Elastic self-locking nut

Technical Field

The invention relates to an elastic self-locking nut, and belongs to the field of machining and manufacturing of mechanical parts.

Background

The nut is a part for tightly connecting mechanical equipment, and the nut and the bolt with the same specification can be connected together through the threads on the inner side. The nut is generally used in cooperation with the washer, when the nut is used for fastening a bolt or a screw, the gasket is required to be sleeved on the bolt and the screw, then the nut is connected and fastened with the screw or the bolt, the nut is mainly prevented from loosening by means of friction of a thread surface and a built-in anti-loosening piece, and the following main types of nuts are developed along with continuous progress of the technology: the nut is characterized by comprising a built-in nylon ring anti-slow nut, a built-in anti-slow round elastic yellow nut, a tooth-changing nut, a built-in anti-slow pin (ball) self-locking nut, a groove-shaped nut, a tangential elastic anti-slow groove-shaped nut and the like. Other lockings still have nut and additional anti-loosening combination, it has: the method of adding elastic yellow washer and stop washer, using adhesive, anti-loosing of impact deformation point, eccentric self-locking nut, etc. has the advantages and disadvantages, and can only meet the use requirement of certain conditions, and the anti-loosing strength is not enough to achieve the anti-loosing purpose. Although the built-in slow round pin (ball) of preventing auto-lock nut, eccentric formula auto-lock nut prevent slowly intensity enough, solved numerous drawback of preventing slowly the nut basically, but easily make the screw thread of connecting piece take place local plastic deformation during its auto-lock, repetitious usage can destroy the screw rod screw thread, influences screw rod life.

Disclosure of Invention

The invention aims to provide an elastic self-locking nut which can not solve the problems of insufficient anti-slow strength and the like of the existing nut anti-loose, has reasonable structure, has the characteristics of convenient assembly and disassembly, repeated use, reliable anti-loose, no limitation of any use condition and the like, obviously improves the self-locking performance and prolongs the service life.

The invention aims to realize the purpose, and the elastic self-locking nut comprises an upper nut and a lower nut, and is characterized in that: the bottom of the upper nut is provided with an embedded taper sleeve spigot, the upper end surface of the lower nut is provided with a protruding elastic taper sleeve, and the elastic taper sleeve is in threaded connection with the taper sleeve spigot. After the lower nut is tightened to the connected member, the upper nut continues to tighten around the bolt thread line through the taper of the taper spigot to exert a radial force on the elastic taper sleeve, acting on the internal thread of the elastic taper sleeve to provide a so-called circumferential "wedge" effect on the external thread of the bolt to reliably prevent them from loosening from each other.

The outer edge of the taper sleeve spigot is provided with a mark convex point, and the mark convex point and the taper sleeve spigot are of an integrated structure. The marking knob, which is used for tightening the upper nut against a wrench, a set of wrenches or other lower end part of the tightening tool, such as the lower surface or the inner peripheral end area around a hole for engaging the nut, can be made so that it or their angle of rotation can be seen visually. When the nut assembly is used, the marking lug will be lowered against the tightening tool as it tightens the upper nut. The tightening tool is not subject to any interference or engagement with the lower nut. The upper nut is easily tightened. Since the angle of rotation of the upper nut can be seen by the naked eye, the upper nut can be tightened properly while checking the torque applied thereto.

The upper end of the elastic taper sleeve is provided with a radial taper sleeve notch, and the taper sleeve notch and the elastic taper sleeve are of an integrated structure.

And a non-metal washer is arranged on the contact surface of the taper sleeve spigot and the elastic taper sleeve.

And the upper nut and the lower nut are provided with an axial clearance which is less than or equal to one half of the thread lead in an initial state.

The internal thread of the lower nut is the same as the internal thread of the upper nut, and the thread center lines of the lower nut and the upper nut are on the same axial center line.

The outer diameter of the elastic taper sleeve is the same as the axial center line of the inner diameter of the spigot of the taper sleeve, and the axial center line of the elastic taper sleeve and the thread center line of the elastic taper sleeve are on the same axis.

The invention has the beneficial effects that: because the connecting threads of the connected screw rod and the elastic self-locking nut are always matched in the rotating process, the threads meshed with each other are not damaged, so that the screw rod and the elastic self-locking nut can be repeatedly used, the self-locking performance of the nut is obviously improved, and the service life of the nut is obviously prolonged. The larger the rotation angle of the upper nut is, the larger the radial force is, the larger the self-locking force is, the anti-loosening effect is good, and the elastic self-locking nut is particularly suitable for important threads which frequently vibrate strongly.

Drawings

FIG. 1 is a schematic structural view of an embodiment of the present invention;

FIG. 2 is a schematic view A-A of FIG. 1;

FIG. 3 is a schematic view of the upper nut of the present invention;

FIG. 4 is a schematic view of the lower nut of the present invention;

FIG. 5 is an additional schematic view of the lower nut of the present invention;

FIG. 6 is a schematic view of a usage state of the present invention;

the labels in the figure are: 1-upper nut, 2-lower nut, 3-nonmetal washer, 4-taper sleeve spigot, 5-elastic taper sleeve, 6 marking salient point, 7-taper sleeve notch, 8-common washer, 9-connected piece and 10-bolt.

Detailed Description

The technical features of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The specific structure of the present invention will be described in detail with reference to FIGS. 1 to 6. The elastic self-locking nut consists of an upper nut 1 and a lower nut 2. Wherein, one end of the lower nut 2 is provided with an elastic taper sleeve 5 which is assembled in the built-in taper sleeve spigot 4 of the upper nut 1 and connected with the upper nut. The internal thread of the lower nut 2 is the same as the internal thread of the upper nut 1, and the thread center lines are on the same axial center line. And at this moment, the elasticity auto-lock nut is the same with ordinary nut, can bare-handed screw smoothly on same specification bolt 11. The upper nut 1 and the lower nut 2 may be processed separately. The axial clearance that is less than or equal to one half of screw thread lead is set up between 2 upper ends of terminal surfaces and the lower nut under upper nut 1 under the initial condition, in order to strengthen body 2 self-locking ability better, set up non-metallic gasket at the top outside 4 inner of last nut 1 taper sleeve tang and 2 elastic taper sleeves 5 of lower nut to when upper nut 1 rotates and compresses tightly, produce the check effect like built-in check spring nut, further prevent that upper nut 1 is not hard up when locking state.

The marking knob 6 is intended to abut against a spanner, a set of wrenches or other lower end part of a tightening tool when tightening the upper nut, e.g. around the lower surface or inner peripheral end area of a hole engaging the nut, which marking knob 6 can be made so that it or their angle of rotation can be seen visually.

When the elastic self-locking nut is used for locking the connected piece 9 and the connecting bolt 10 through the common washer 8 and needs self-locking, the upper nut 1 is rotated for an angle relative to the upper edge screwing nut, and the operation is very simple. At the moment, the internal thread of the upper nut 1 moves downwards relative to the internal thread of the connecting bolt 10 or the internal thread of the lower nut 2, under the action of the axis, the internal thread of the upper nut 1 generates a large radial force at the meshing position relative to the external thread of the connecting bolt 10, according to the mechanics principle, the internal thread of the elastic taper sleeve 5 at one end of the lower nut 2 generates a large radial reaction force at the meshing position relative to the external thread of the connecting bolt 10, and the elastic self-locking nut and the connected bolt 10 are firmly locked under the two radial forces. The self-locking force is enhanced along with the increase of the rotation angle of the upper nut 1 relative to the lower nut 2, thereby realizing the locking functions of looseness prevention, double self locking and slow locking prevention.

When the locking is needed, as long as the upper nut 1 rotates relative to the lower nut 2, the internal thread holes of the upper nut 1 and the lower nut 2 which are initially coaxial in the upper nut 1 and the lower nut move up and down, the external thread of the connected screw rod is clamped by the internal thread of the taper sleeve spigot 4 to generate axial pressure, radial pressure and friction force downwards, the elastic self-locking nut can be prevented from loosening, and meanwhile, after the upper nut 1 rotates, the upper nut is connected by the internal thread, and the axial movement of the upper nut is pressed to the lower nut 2.

When the elastic self-locking nut needs to be disassembled, the upper nut 1 returns to the initial position relative to the lower nut 2, so that the upper nut 1 is reset, and the upper nut 1 is reset only by rotating the upper nut in the opposite direction during self-locking, and the elastic taper sleeve 5 at one end of the upper nut 1 and one end of the lower nut 2 are also reset simultaneously, so that the internal threads of the external threads of the connecting bolt 10 disappear under the meshing action force, and the elastic self-locking nut can be disassembled smoothly and can be reused as a common nut.

Claims

1. An elastic self-locking nut, comprising an upper nut (1) and a lower nut (2), characterized in that: the bottom of the upper nut (1) is provided with a built-in taper sleeve stopper (4), and the lower nut (2) A protruding elastic taper sleeve (5) is provided on the upper end surface of the taper sleeve, and the elastic taper sleeve (5) is threadedly connected with the taper sleeve stopper (4).

2. The elastic self-locking nut according to claim 1, characterized in that: at least one marking bump (6) is set on the outer edge of the taper sleeve stopper (4), and the marking bump (6) is connected to the taper sleeve stopper. The mouth (4) is an integral structure.

3. The elastic self-locking nut according to claim 1, characterized in that: the upper end of the elastic taper sleeve (5) is provided with a radial taper sleeve slot (7), the taper sleeve slot (7) and the elastic taper sleeve (5) One-piece structure.

4 . The elastic self-locking nut according to claim 1 , wherein a non-metallic washer ( 3 ) is provided on the contact surface between the taper sleeve stopper ( 4 ) and the elastic taper sleeve ( 5 ). 5 .

5 . The elastic self-locking nut according to claim 1 , wherein the upper nut ( 1 ) and the lower nut ( 2 ) in the initial state are provided with an axial direction less than or equal to half of the thread lead. 6 . gap.

6. The elastic self-locking nut according to claim 1, characterized in that: the inner thread of the lower nut (2) is the same as the inner thread of the upper nut (1), and the thread centerlines thereof are in the same axial direction centerline.

7. The elastic self-locking nut according to claim 1, wherein the outer diameter of the elastic taper sleeve (5) is the same as the axial centerline of the inner diameter of the taper sleeve stopper (4), and its The axial centerline is on the same axis as its thread centerline.