CN202118079U

CN202118079U - Anti-loosening structure for thread connection

Info

Publication number: CN202118079U
Application number: CN2011201710071U
Authority: CN
Inventors: 秦小屿; 朱维兵; 王和顺
Original assignee: Xihua University
Current assignee: Xihua University
Priority date: 2011-05-26
Filing date: 2011-05-26
Publication date: 2012-01-18
Anticipated expiration: 2021-05-26

Abstract

The utility model relates to an anti-loosening structure for thread connection, composed of a bolt, a connection nut, a locking nut, and a stop gasket. The technical scheme is as follows: a large thread and a small thread are disposed on the bolt, wherein the large thread part is screwed with the connection nut to act a fastening function, and the small thread part is screwed with the locking nut to act an anti-loosening function. The spiral directions of the two threads are the same (generally are right-spiral); the screw pitches are different, and the screw pitch of the small thread part is greater than that of the large thread part. The nominal diameter of the small thread part is less than the small diameter of the large thread part, so that the connection nut can be conveniently screwed. When the connection nut is loosened and rotates towards an exiting direction, the locking nut simultaneously rotates under the function of a combined surface friction force; however, the screw pitch of the locking nut is less than that of the connection nut, so that the exiting of the connection nut is prevented, and an anti-loosening function is acted. One stop gasket may be added between the locking nut and the connection nut, so that the anti-loosening effect is better.

Description

A kind of thread connection anti-loose structure

Technical field

The utility model relates to mechanical connection, is a kind of thread connection anti-loose structure specifically.

Background technique

Being threaded is a kind of common Placement in the Machine Design, and under the little situation of static load and temperature variation, being threaded can self-locking conditions satisfied, connects or the phenomenon that gets loose can not occur in threaded together.But because machine exists impact, vibration or varying load etc. in the course of the work, the frictional force between screw pair possibly reduce or pop-off, and the repeatedly repetition of this phenomenon is threaded and will gets loose.If get loose, with the normal operation that influences machine, even serious accident takes place, so be threaded locking be the problem that design must be considered when being threaded.

The root problem of thread connection anti-loose is to prevent relatively rotating of screw pair, and wherein " to jacking nut " is a kind of method of utilizing tribology principle locking, and two nuts are tightened the top, and bolt screws Duan Shoula and the nut pressurized, thereby screw pair is vertically compressed.But the screw thread to two nuts in the jacking nut structure commonly used is with a kind of screw thread; Be that diameter, rotation direction, pitch etc. are identical, when two nuts rotated simultaneously, the frictional force that pressure produces between two nuts can not play hindrance function; Therefore can improve this structure, improve anti-loosing effect.

Summary of the invention

The purpose of the utility model provides a kind of thread connection anti-loose structure.

The technological scheme of the utility model:

Small one and large one two kinds of screw threads are arranged on bolt (1), and major thread part (102) screws with attaching nut (3) and plays the role of fastening, and minor thread part (101) has screwed locking effect with locking nut (2).Two kinds of thread rotary orientations identical (being generally dextrorotation), but pitch is different, and the pitch of minor thread part (101) is less than the pitch of major thread part (102).The nominal diameter of minor thread part (101) can conveniently screw in attaching nut (3) less than the path of major thread part (102).The locking principle of this technological scheme is: when attaching nut (3) occurs loosening; When exit axis rotates; Under the junction plane function of friction, locking nut (2) also rotates simultaneously, but since the pitch of locking nut (2) less than the pitch of attaching nut (3); Stop withdrawing from of attaching nut (3), played locking effect.If between locking nut (2) and attaching nut (3), add 1 locked spacer (4), anti-loosing effect will be better.

Beneficial effect: simple in structure, two thread rotary orientations are identical, and installation and removal are convenient.

Description of drawings

Fig. 1, Fig. 2 do not add locked spacer and the schematic representation that is threaded that adds locked spacer.The 1-bolt, 101-minor thread part, 102-major thread part, 2-locking nut, 3-attaching nut, 4-locked spacer.

Embodiment

Scheme 1 is not add being threaded of locked spacer to show, and is as shown in Figure 1.When becoming flexible appears in attaching nut (3), when exit axis rotates, under the junction plane function of friction; Locking nut (2) also rotates simultaneously; But, play locking effect because the pitch of locking nut (2) has stoped withdrawing from of attaching nut (3) less than the pitch of attaching nut (3).

Scheme 2 is to add being threaded of locked spacer to show, and is as shown in Figure 2.After adding locked spacer 4, two nuts must rotate simultaneously, because two nut pitch are different, locking nut (2) has stoped attaching nut (3) to rotate, and plays locking effect.

Claims

1. thread connection anti-loose structure is characterized in that: bolt (1) two kinds of screw threads of size are arranged, two thread rotary orientations are identical, but pitch is different, the pitch of minor thread part (101) is less than the major thread pitch of (102) partly; The nominal diameter of minor thread part (101) is less than the path of major thread part (102).

2. thread connection anti-loose structure according to claim 1 is characterized in that and can between locking nut (2) and attaching nut (3), add 1 locked spacer (4).