CN2667228Y

CN2667228Y - Self-locking screw

Info

Publication number: CN2667228Y
Application number: CN 200420000107
Authority: CN
Inventors: 王世清
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-01-02
Filing date: 2004-01-02
Publication date: 2004-12-29
Anticipated expiration: 2014-01-02

Abstract

The utility model discloses an interlacing screw locking bolt, comprising a screw rod and a nut. The screw rod is provided with left and right spinner in interlacing pattern; the nut consists of main nut and vice nut, the main nut is right lateral internal screw nut, the vice nut is left lateral internal screw nut, and the main nut and the vice nut are connected with the screw rod thorough own thread. The bolt of utility model guarantees the two nuts supported and locked with each other under the violent vibration situation, have solved the problem of anti-loosing of nut under the environment of vibration.

Description

Self-locking screw

Technical field

The utility model relates to the screw of the locking self-locking binding thread alternating expression of a kind of antivibration, belongs to a kind of securing means of mechanical structure.

Background technique

The connection fastening piece of mechanical structure is an extremely important part of machinery production.Fastening locking method has locking methods such as riveted joint, bonding and bolt structure.Though screw is simple in structure, very important to the fastening effect between member, it connects effective, convenient, dismantled and assembled.Because its dismantled and assembled property has caused the generation of the seemingly inherent defect of bolt structure " problem gets loose ".Many anti-loose methods are not deal with problems at all, have destroyed the conveniently detachable property of bolt structure exactly.Bolt structure is when connecting object, because factors such as temperature variation, vibration can cause nut slowly to get loose, causes very big loss and a lot of potential safety hazard to industrial and agricultural production.Be directed to the locking problem of bolt structure and have a variety of the improvement of bolt structure.Improve and mainly concentrate on the following aspects:

Damage type fastening locking: this method is in the advantage that realizes also having destroyed in locking the dismantled and assembled property of bolt structure.The screw thread that has destroyed screw comes locking, very inadvisable.

Improvement at aspects such as line buckle structures: these improvement can only improve locking a part of problem from the angle of amount, do not solve root problem, and the too carefully too special difficult processing of screw thread, also are damaged easily.

Screw is as a kind of primary component of secure component, and its vibrationproof locking functions was paid close attention in recent years.With many methods be that privileged site punching adds a locking pin on screw rod.Its anti-battle array anti-loosing effect is good, but is unsuitable for use in enormous quantities.

Two nuts in some using processs, usually can have been used; though solved a part of locking problem; but certain defective is arranged himself; because two nuts are identical with the thread rotary orientation that screw rod connects, be difficult to guarantee vibrating two problems that nuts do not become flexible to a direction simultaneously together under the violent situation.

Summary of the invention

In order to overcome the defective that above-mentioned screw exists, the utility model proposes a kind of screw thread that on screw rod, is provided with different rotation directions, and two different internal threaded nut structures of suit, with the fastening Self-locking screw that prevents to get loose in vibration environment.

The utility model is a kind of staggered thread type Self-locking screw, comprises screw rod, nut, and its screw rod is provided with left-handed thread and right-handed thread, and left and right hand thread is staggered in together; Described nut is made up of mother nut and secondary nut, and its mother nut is the dextrorotation internal threaded nut, and secondary nut is the levogyrate inner thread nut, and described mother nut and secondary nut are by being threaded on the screw rod separately.

Described screw, its screw rod also can be the screw rods of band self tapping end.

Described screw, the pitch of the left-handed thread on its screw rod can equal the pitch of right-handed thread; Also can be less than the pitch of right-handed thread; Also can be greater than the pitch of right-handed thread.

Described screw can be metal material machine shaping, also can adopt compression molding of plastic materials.

The advantage of the utility model screw is: auto-lock function is arranged, effectively raise reliability and working life that machinery uses.Because two nuts are close together, driving left-handed nut by frictional force when the right-handed nut turns round rotates to same direction together with it, because thread rotary orientation is opposite, left-handed nut must advance and props up when the right-handed nut retreated, crowded so more tight more, tight more crowded more, reach self-locking, solved the nut problem that gets loose simultaneously.

Description of drawings

Fig. 1 is the structural representation of the utility model screw.

Fig. 2 is the structural representation of mother nut.

Fig. 3 is the structural representation of secondary nut.

Fig. 4 is the schematic representation of the utility model screw rod.

Fig. 5 is the enlarged view of Fig. 4 thread section.

Fig. 6 is the structural representation of different pitch (about revolve pitch 1/3).

Among the figure: 1. screw rod 2. mother nuts 3. secondary nut 4. right-handed threads 5. left-handed threads

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

A kind of staggered thread type Self-locking screw of the present utility model comprises screw rod 1, mother nut 2, secondary nut 3, and screw rod 1 is provided with left-

handed thread

5 and 4, two kinds of screw threads of right-handed thread are staggered together.Right-handed thread 4 is used for satisfying screw attachment intensity, and it is locking that left-handed thread 5 is used for self-locking, and mother nut 2 and right-handed thread 4 match, be the right-handed nut, secondary nut 3 and left-handed thread 5 match, and are left-handed nut, obviously, two nuts all can free spinning in and out on screw rod.The locking Self-locking screw of this antivibration, when being used to connect object, mother nut 2 screws earlier, and secondary then nut 3 screws again.When mother nut 2 got loose trend, it forced secondary nut 3 and it to rotate to a direction by frictional force, because the thread rotary orientation of secondary nut 3 and mother nut 2 is opposite, props up mother nut 2 so secondary nut 3 will advance, and reaches self-locking state.To its release, it can not get loose if not artificial.Thread section on the screw rod 1 no longer is traditional single rotation direction screw thread, but the screw thread of two rotation directions is staggered in together.

In the utility model, one end of screw rod 1 can be for having the screw rod of self tapping end, usefulness when connecting on the workpiece of being inconvenient to punch for some is passed workpiece with self-tapping screw, reaches self-locking on the screw rods and workpiece is linked together do not get loose passing on the end to screw in mother nut 2 and secondary nut 3.

In the utility model, when the pitch of thread on the screw rod 1 is unequal, mainly be in order to reduce secondary cutting amount (the secondary cutting amount is meant when screw rod is got on the bus the less pitch screw of system manufactured bite than the large screw pitch lira), guarantee the intensity of right-handed thread 4, will describe the intensity of screw thread with the example of the different pitches of thread below.

The pitch of the left-handed thread 5 on screw rod 1 equals the pitch of right-handed thread 4, nut on screwing in screw rod 1 time mother nut 2 be positioned at secondary nut 3 front ends.In fact left-handed line and dextrorotation line fully the symmetry, intensity too, the position of major-minor nut can exchange.Therefore, use more conveniently, and left and right sides rotation direction thread pitch is identical, and processing is got up more convenient.But the pitch of the major-minor nut that do not have fully to arrange in pairs or groups makes the secondary cutting amount big, and main thread intensity is not allocation optimum, and thread pitch is bigger, can be used for general occasion, and versatility is stronger.

The pitch of the left-handed thread 5 on screw rod 1 is less than the pitch of right-handed thread 4, nut on screwing in screw rod 1 time mother nut 2 be positioned at secondary nut 3 front ends.At this moment the position of major-minor nut can not be changed, before mother nut 2 must be positioned at secondary nut 3.Because left-handed line pitch is less than the dextrorotation line, dextrorotation line intensity is relatively big, and it and mother nut 2 cooperate the bond strength that screw is provided.Left-handed line strength ratio is less, and it and secondary nut 3 cooperate the self-locking strength that nut is provided.This pitch cooperates, and makes the secondary cutting amount less, and is less to the infringement of dextrorotation line intensity.The pitch ratio of this screw is generally between 1/4～1/2.The screw strength of too little left-handed line is not enough, and the intensity infringement to the dextrorotation line is too big too greatly.When manufacturing, determine dextrorotation line pitch earlier, determine left-handed line pitch according to proper proportion again.This screw thread processing will bother when equating than two kinds of pitches of thread, but structure optimization, and thread pitch is also less, is fit to special occasions.

The pitch of the left-handed thread 5 on screw rod 1 is greater than the pitch of right-handed thread 4, nut on screwing in screw rod 1 time secondary nut 3 be positioned at mother nut 2 front ends.The pitch of this situation and left-handed thread 5 is just in time opposite less than the pitch of right-handed thread 4, and at this moment the position of major-minor nut can not be changed, before secondary nut 3 must be positioned at mother nut 2.Because dextrorotation line pitch is less than left-handed line, left-handed line intensity is relatively big, and it and secondary nut cooperate the bond strength that screw is provided.Dextrorotation line strength ratio is less, and it and mother nut cooperate the self-locking strength that nut is provided.This pitch cooperates, and makes the secondary cutting amount less, and is less to left-handed line intensity infringement.The pitch ratio of this screw is generally between 1/4～1/2.The screw strength of too little dextrorotation line is not enough, and the intensity infringement to left-handed line is too big too greatly.When manufacturing, determine left-handed line pitch earlier, determine dextrorotation line pitch according to proper proportion again.This screw thread processing will bother when equating than two kinds of pitches of thread, but structure optimization, and thread pitch is also less, is fit to special occasions.

The fastening effect of screw self-locking in the utility model is very obvious, and in fact, major and minor nut can self-locking on the thread section of screw rod arbitrary position, and under the situation of vibration, major and minor nut can be locked.Self-locking screw of the present utility model also is fit to some plastic materials screws, and they can disposable compression molding.For the screw of metallic material, on the operation of existing screw machining screw, to carry out secondary cutting and get final product, when being thread cutting, deburring is cumbersome.

Screw application area of the present utility model is very extensive, is very tempting in some high speed or its effect of high vibration occasion, and use value is very big.

Claims

1, a kind of staggered thread type Self-locking screw comprises screw rod, nut, it is characterized in that: described screw rod (1) is provided with left-handed thread (5) and right-handed thread (4), and left and right hand thread is staggered in together; Described nut is made up of mother nut (2) and secondary nut (3), and its mother nut (2) is the dextrorotation internal threaded nut, and secondary nut (3) is the levogyrate inner thread nut, and described mother nut (2) and secondary nut (3) are by being threaded on the screw rod (1) separately.

2, screw according to claim 1 is characterized in that: screw rod (1) also can be the screw rod of band self tapping end.

3, according to claim 1,2 described screws, it is characterized in that: the pitch of the left-handed thread (5) on the screw rod (1) equals the pitch of right-handed thread (4).

4, according to claim 1,2 described screws, it is characterized in that: the pitch of the left-handed thread (5) on the screw rod (1) is less than the pitch of right-handed thread (4), nut on screwing in screw rod the time mother nut (2) be positioned at secondary nut (3) front end.

5, according to claim 1,2 described screws, it is characterized in that: the pitch of the left-handed thread (5) on the screw rod (1) is greater than the pitch of right-handed thread (4), nut on screwing in screw rod the time secondary nut (3) be positioned at mother nut (2) front end.

6, according to claim 1,2 described screws, it is characterized in that: described screw adopts the metal material processing moulding.

7, according to claim 1,2 described screws, it is characterized in that: described screw also can adopt compression molding of plastic materials.