CN201090583Y

CN201090583Y - Anti-loose bolt

Info

Publication number: CN201090583Y
Application number: CNU2007201001948U
Authority: CN
Inventors: 张建平
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-26
Filing date: 2007-10-26
Publication date: 2008-07-23
Anticipated expiration: 2017-10-26

Abstract

The utility model discloses an anti-release bolt, comprising a bolt head and a screw body connected with the bolt head; a one-way full thread is arranged on the screw body. The utility model is characterized in that the screw thread on the screw body is composed of forward screw thread and back screw thread arranged at both sides of the central line of the screw body; the alignments of the screw threads are symmetrically arranged; the helix angle of the screw thread is designed between 55 and 60 degrees; both the thread forms of the forward and the backward screw threads are standard screw threads or heterologous screw threads; two nuts are matched with the bolt, the alignment and the thread form of the inside screw thread of each nut is the same as the alignment and the thread form of the forward and the backward screw threads of the screw. The utility model enhances the reliability and the closeness of connection, has the capacity of preventing the release of the bolt and further prevents the screw threads of the screw and the nuts from disengaging. With the advantages of easy production, low production cost and convenient use, the utility model can be widely applied to the industries of automobile, ships, bridges and machinery.

Description

A kind of anti-loose bolt

Technical field

The utility model belongs to clamp structure, relates to a kind of bolt, specifically, relates to a kind of anti-loose bolt.

Background technique

Bolt is one of device of using of machine parts, as fastening connection piece, screw thread by bolt is realized the scyewed joint to the link of machinery, make the linking intensity must be in safe and reliable and have a tightness, therefore, the scyewed joint technology is the most frequently used, the simplest and one of the most effective connection technique of the link in the machinery, and it is widely used in the mechanical manufacturing field.The bolt that movement parts on the connection machine such as main bearing, connecting rod and flywheel are used, its structure is the unidirectional screw bolt of fine finishing on the screw rod body, especially hexagon head bolt is used general, the bolt of this structure is in the application in practice process, because under the effect of impact, vibration or the varying load of machine, the frictional force between the screw thread width of cloth may reduce or instantaneous disappearance.After this phenomenon repeatedly repeats, the screw thread of screw rod and nut is threaded off, Bolt Connection gets loose, connect and lost efficacy, light then be to make equipment produce certain technical failure, heavy then serious accident can take place, this will be related to the safety problem of site operation personnel's personal safety and machinery operation running.

For preventing that Bolt Connection from getting loose, the method that adopts has the frictional force method of increase and mechanical means at present.Increase the frictional force method, generally adopt spring washer to hold out against nut, packing ring flattens the back and produces elastic force, and this method is simple, but because of there being the spring washer problem on deformation, locking very unreliable.Mechanical means is as adding nylon jacket on screw rod, the bolt central part adds a guide rod and the poor shape nut of hexagonal is equipped with cotter pin, though play anti-loosing effect with this kind bolt, in long-term the use, will cause bolt fracture, is not easy to repair.Therefore as seen, the Bolt Connection in the mechanical transmission when not only requiring rational more tightening technology, has also proposed rational structure requirement more to the structure of bolt.How to design not only reliably, but also economic bolt arrangement be to need the key issue that solves in the industrial production.

Summary of the invention

The purpose of this utility model is to provide a kind of anti-loose bolt, with the screw rod of bolt and the screw thread dropout problem of nut on the connected piece of solution in movable machinery.

For realizing the purpose of this utility model, the technological scheme that is adopted is:

A kind of anti-loose bolt, comprise the screw rod body that bolt head is connected with bolt head, on the screw rod body, be provided with unidirectional Full Thread FT, it is characterized in that: the screw thread on the described screw rod body, be by the forward screw thread and the reverse thread that design respectively in screw rod body center line both sides, the alignment of screw thread rearranges symmetrically, and the helix angle of screw thread is designed to 55 °-60 °.

Described forward screw thread and reverse thread, its thread profile are standard-type thread or special-shaped screw thread.

Described nut, the nut that matches with it is double nut, the alignment of nut inner thread and the design of thread profile are consistent with the alignment and the tooth form of the forward of screw rod, reverse thread.

The beneficial effects of the utility model and advantage:

Beneficial effect: because design has forward and a reverse screw thread on the screw rod body, with and the internal thread of the double nut that matches, also design has corresponding to forward and reverse thread, with match link in the connection machinery of screw rod and nut.The vibration or the shake that in machinery or equipment operation or rotary course, are produced, vibration or shake involve fastening bolt, the screw rod of bolt and nut forward screw thread are when postive direction is loosening, another reverse thread of screw rod and nut will connect reverse screwing with inverse direction this moment, thereby prevent getting loose of bolt.

Advantage: the utlity model has simple in structurely, reasonable in design, be easy to processing and fabricating, cost is low, advantage easy to use.

Description of drawings

Below in conjunction with drawings and Examples the utility model is described in detail.

Fig. 1 is the structural representation of the utility model nut;

Fig. 2 is the nut cut-away view that matches with the utility model bolt.

Embodiment

Referring to Fig. 1, a kind of anti-loose bolt, comprise the screw rod body that bolt head is connected with bolt head, on the screw rod body, be provided with unidirectional Full Thread FT, it is characterized in that: the screw thread on the described screw rod body 2, be that the alignment of screw thread rearranges symmetrically by the forward screw thread 3 and the reverse thread 4 that design respectively in screw rod body center line both sides, the helix angle of screw thread is designed to 55 °-60 °.

Described forward screw thread 3 and reverse thread 4, its thread profile are standard-type thread or special-shaped screw thread.

Described nut, the nut 5 that matches with it is double nut 5, the alignment of nut 5 internal threads 6 and the design of thread profile are consistent with the alignment and the tooth form of the forward of screw rod 2,

reverse thread

3,4, as shown in Figure 2.

Anti-loose bolt of the present utility model and supporting nut thereof, its intensity rank and specification limit are by the standard setting of National Quality ﹠ Technology Inspection Bureau's formulation.

The utility model has strengthened the rigidity of scyewed joint, and tightness and anti-loose ability can be applicable to every profession and trades such as automobile, steamer, bridge and machine manufacturing.

Claims

1. anti-loose bolt, comprise the screw rod body (2) that bolt head (1) is connected with bolt head, on screw rod body (2), be provided with unidirectional Full Thread FT, it is characterized in that: the screw thread on the described screw rod body (2), be by the forward screw thread (3) and the reverse thread (4) that design respectively in screw rod body center line both sides, the alignment of screw thread rearranges symmetrically, and the helix angle of screw thread is designed to 55 °-60 °.

2. anti-loose bolt according to claim 1 is characterized in that: described forward screw thread (3) and reverse thread (4), its thread profile is standard-type thread or special-shaped screw thread.

3. anti-loose bolt according to claim 1, it is characterized in that: described nut, the nut that matches with it (5), be double nut (5), the alignment of nut (5) internal thread (6) and the design of thread profile, with forward, the reverse thread (3) of screw rod (2), the alignment and the tooth form of (4) are consistent.