CN103195786A

CN103195786A - Anti-looseness nut

Info

Publication number: CN103195786A
Application number: CN201310121253XA
Authority: CN
Inventors: 许彦杰; 晋文彬
Original assignee: 徐文秀; 晋文彬
Priority date: 2013-04-09
Filing date: 2013-04-09
Publication date: 2013-07-10

Abstract

The invention relates to an anti-looseness nut capable of preventing automatic looseness on a bolt. The anti-looseness nut is composed of a main nut and an auxiliary nut which are axially connected together in a threaded mode, inner holes of the main nut and the auxiliary nut are provided with threads matched with the bolt, and a side wall of a shoulder in one end of the main nut is provided with inner threads for connecting the auxiliary nut. An outer wall of the auxiliary nut is provided with outer threads matched with the inner threads on the side wall of the shoulder in the main nut. A central line of the inner threads on the side wall of the shoulder in the main nut and a central line of the outer threads on the outer wall of the auxiliary nut deviate from a central line of the nut for 0.45-0.6mm, and a distance between the inner threads on the side wall of the shoulder in the main nut and the outer threads on the outer wall of the auxiliary nut is 1/2 of thread pitch matched with the bolt. The anti-looseness nut is reasonable in structure, easy to manufacture, simple and convenient to operate and reliable in performance, and the problem of the reliability of the anti-looseness nut serving as a connection fastening part in a severe environment is effectively solved.

Description

Lock nut

Technical field

The present invention relates to a kind of loosening voluntarily lock nut that prevents on bolt.

Background technique

Bolt and nut is widely used on each field machinery, power, the mechanical component as habitual removable fastening component.And in sharp pounding or irregular powerful fluctuation environment, nut loosening, obscission can take place, therefore cause mechanical accident even serious security incident.Can realize preventing that nut is loosening voluntarily with which kind of simple and easy to do method, to guarantee the reliability of linkage structure, be the technical barrier that all relevant those skilled in the art inquire into always.

Summary of the invention

The purpose of this invention is to provide a kind of rational in infrastructure, be easy to make, the lock nut of easy and simple to handle, reliable performance, with effective solution reliability as the connection secure component under abominable working environment.

Lock nut of the present invention constitutes by axially being screwed onto mother nut and the secondary nut that together endoporus has the spiral that matches with bolt, and the sidewall of shoulder is provided with the internal thread of auxiliary connection nut in described mother nut one end; Be provided with the outside thread that matches with internal thread on the shoulder sidewall in the mother nut at the outer wall of described secondary nut; Center line and the externally threaded center line on the secondary nut outer wall of the internal thread in the mother nut on the shoulder sidewall all depart from 0.45～0.6mm with its nut center line, and the internal thread in the mother nut on the shoulder sidewall and the externally threaded pitch on the secondary nut outer wall are 1/2 times of the helical pitch that matches with bolt.

The working principle of lock nut of the present invention is: when the mother nut and the secondary nut that are screwed onto together, following time of the complete coincidence status of externally threaded center line on the center line of the internal thread in mother nut on the shoulder sidewall and the secondary nut outer wall, the center line of the spiral that matches with bolt of mother nut and secondary nut also overlaps fully, under this state, this lock nut can be screwed in and be fastened on the bolt, then with secondary nut to screwing direction rotate to an angle again (general angle of swing is 30 °～75 °).At this moment, secondary nut inner thread is locked bolt under the effect of eccentric screw thread, and secondary nut outside thread produces secondary locking with mother nut under the effect of skew, so far, makes bolt not produce loosening with mother nut and secondary nut simultaneously.When needs unload lower nut, earlier secondary nut is circled round to initial position to unscrewing direction, be under center line and the complete coincidence status of externally threaded center line on the secondary nut outer wall of the internal thread on the shoulder sidewall in the mother nut after, get final product this lock nut integral body unloaded down from bolt.

Lock nut of the present invention, have rational in infrastructure, be easy to make, the powerful anti-loosening property of easy and simple to handle, high reliability.

Description of drawings

Fig. 1 is the structural representation of lock nut of the present invention under application state;

Fig. 2 is the structural formula intention of mother nut shown in Fig. 11;

Fig. 3 is the structural representation of secondary nut 2 shown in Fig. 1.

Embodiment

The embodiment who provides below in conjunction with accompanying drawing is described in further detail the present invention.

Referring to figs. 1 through Fig. 3, a kind of lock nut constitutes by axially being screwed onto mother nut 1 and the secondary nut 2 that together endoporus has the spiral that matches with bolt, and the sidewall of shoulder is provided with the internal thread 1.1 of auxiliary connection nut 2 in described mother nut 1 one ends; Be provided with the outside thread 2.1 that matches with internal thread 1.1 on the shoulder sidewall in the mother nut 1 at the outer wall of described secondary nut 2; The center line of the internal thread 1.1 in the mother nut on the shoulder sidewall and the center line of the outside thread 2.1 on secondary nut 2 outer walls all depart from 0.45～0.6mm with its nut center line (center line of the spiral that namely matches with bolt), and the internal thread 1.1 in the mother nut on the shoulder sidewall and the pitch of the outside thread 2.1 on secondary nut 2 outer walls are 1/2 times of the helical pitch that matches with bolt.

The artificial damage that causes lock nut in order to prevent from use taking place excessively to unscrew or screw secondary nut, in described mother nut 1 the shoulder sidewall be provided with secondary nut 2 outer walls on the radial location pin of restraining groove 2.2 sliding fits, spacing to realize, and avoid random dismounting.

This lock nut class is manufactured in the following manner:

1. processing and fabricating mother nut 1 and secondary nut 2 bodies and the two the same standard screw thread of being spirally connected respectively, that is the outside thread 2.1 that matches with internal thread 1.1 on the shoulder sidewall in the mother nut 1 on the internal thread 1.1 of the auxiliary connection nut 2 on the shoulder sidewall and secondary nut 2 outer walls in mother nut 1 one ends,

2. the secondary nut 2 after the above-mentioned processing is screwed in mother nut 1 to desired location, one processes and the spiral that matches with bolt, make the center line o(of this spiral namely be called the center line of nut) with top described mother nut 1 in the center line a of internal thread 1.1 on the shoulder sidewall and the center line b of the outside thread 2.1 on secondary nut 2 outer walls depart from 0.45～0.6mm, the internal thread 1.1 in the mother nut on the shoulder sidewall and the pitch of the outside thread 2.1 on secondary nut 2 outer walls are 1/2 times of the helical pitch that matches with bolt.And get corresponding " zero " at the outer wall of major and minor nut and spend groove (being the two assembling position).

3. boring radial location pin-and-hole 1.2 to secondary nut 2 at mother nut 1 shoulder sidewall again, unload secondary nut 2, is starting point with this hole on secondary nut 2 walls, oppositely is extended to restraining groove 2.2(a little shown in Fig. 2,3 to what spiral screwed direction).

4. secondary nut 2 is screwed in again mother nut 1 to assembling " zero " some position, locating stud is inserted in the above-mentioned mother nut positioning pin hole 1.2, this locating stud stretches in the restraining groove 2.2 of secondary nut.

The lock nut that is combined into one by this processing, during use, after being fastened on this lock nut screw-in on the bolt, with secondary nut to screwing direction rotate to an angle again (general angle of swing be 30 °～75 °), secondary nut inner thread is locked bolt under the effect of eccentric screw thread, secondary nut outside thread produces secondary locking with mother nut under the effect of skew, so far, make bolt not produce loosening with mother nut and secondary nut simultaneously.

Claims

1. lock nut, constitute by axially being screwed onto mother nut (1) and the secondary nut (2) that together endoporus has the spiral that matches with bolt, it is characterized in that: the sidewall of shoulder is provided with the internal thread (1.1) of auxiliary connection nut (2) in described mother nut (1) one end; Be provided with the outside thread (2.1) that matches with internal thread (1.1) on the shoulder sidewall in the mother nut (1) at the outer wall of described secondary nut (2); The center line of the internal thread (1.1) in the mother nut on the shoulder sidewall and the center line of the outside thread (2.1) on secondary nut (2) outer wall all depart from 0.45～0.6mm with its nut center line, and the internal thread (1.1) in the mother nut on the shoulder sidewall and the pitch of the outside thread (2.1) on secondary nut (2) outer wall are 1/2 times of the helical pitch that matches with bolt.

2. lock nut according to claim 1 is characterized in that: in described mother nut (1) the shoulder sidewall be provided with secondary nut (2) outer wall on the radial location pin of restraining groove (2.2) sliding fit.