CN201133405Y

CN201133405Y - Self locking-type screw sleeve

Info

Publication number: CN201133405Y
Application number: CNU200820300022XU
Authority: CN
Inventors: 马玲; 胡军林; 蔡聪语
Original assignee: Guizhou Aerospace Precision Products Co Ltd
Current assignee: Guizhou Aerospace Precision Products Co Ltd
Priority date: 2008-01-07
Filing date: 2008-01-07
Publication date: 2008-10-15
Anticipated expiration: 2018-01-07

Abstract

The utility model discloses a self-locking thread wire insert which consists of a pin (1) and a wire insert (2) provided with inner thread and outer thread; the wire insert (2) is provided with a thread reef (3); the pin (1) is connected with the wire insert (2) and fastens the wire insert (2) to an aluminum alloy part base solid. The self-locking thread wire insert used to connect the aluminum alloy part base solid with other parts processed with different materials. Compared with the prior art, the self-locking thread wire insert can effectively strengthen the pre-tightening force for the connected parts to be screwed in the aluminum alloy part base solid, so that the connection between the parts and the aluminum alloy part base solid is more reliable and firm, thereby preventing loosening and falling off phenomena, solving the difficulty in the prior art that the connected parts take down the wire insert when unscrew the aluminum alloy part base solid out. The self-locking thread wire insert the advantages of wide scope of application, easiness in manufacturing and processing and bringing convenience for connected parts.

Description

Self locking-type screw insert

Technical field

The utility model relates to a kind of fastening piece, especially a kind of self locking-type screw insert.

Background technique

Screw insert is a kind of fastening piece that uses when two kinds of different matrix materials are connected, and is mainly used in being fastenedly connected of aluminum alloy part.Being widely used of aluminum alloy, but the part of its manufacturing has fatal weakness, exactly when the connected piece with other unlike material processing is fastenedly connected, because screw-threaded coupling and pretightening force in the aluminum alloy part matrix are undesirable, loosening, obscission take place very easily.At present, usually adopt " steel wire silk braid " (thread bush by the steel wire wire rod coiled of definite shape promptly produces internal and external threads in the winding, be commonly called as " silk braid ") promptly in the part of aluminum alloy manufacturing, to inlay to implant screw thread and solve this problem.But the internal and external screw thread of this " steel wire silk braid " must have unified pitch, and its application is very restricted; And its pretension performance neither be very desirable, can not produce self-locking effect, connected piece is implanted with the aluminum alloy part matrix of " steel wire silk braid " at screw-in after, also can become flexible, obscission, and connected piece is when screwing out the aluminum alloy part matrix, and " the steel wire silk braid " that will implant easily taken out of in the lump.

The model utility content

The purpose of this utility model is, a kind of have reliable locking property and firm pre-sigma compactness and the self locking-type screw insert that silk braid can not taken out of when part screws out are provided, thereby solves the problem that prior art exists.

The utility model is to constitute like this: self locking-type screw insert.It is made of latch and the silk braid that has internal and external threads, is provided with the screw thread closing in that is used for the internal thread of silk braid is carried out self-locking on silk braid, and latch connects silk braid and silk braid is fastened in the aluminum alloy part matrix.

In the above-mentioned self locking-type screw insert, described screw thread closes up and preferably is positioned at front end 1/3～2/3 place of silk braid, can make the internal thread of silk braid produce bigger self-lock force like this.

Compared with prior art, self locking-type screw insert of the present utility model is made of latch and silk braid, and silk braid is provided with the screw thread closing in that is used for the internal thread of silk braid is carried out self-locking.During use, the silk braid that will have internal and external screw thread earlier is screwed into the aluminum alloy part matrix, then latch is squeezed into, and latch and silk braid is firmly fastened in the aluminum alloy part matrix gets final product.Like this when the aluminum alloy part matrix is connected with the connected piece of other unlike material processing, can strengthen the pretightening force that connected piece is screwed into the aluminum alloy part matrix greatly, and connected piece has certain self-lock force under the effect of the screw thread closing in of silk braid, can make between connected piece and the aluminum alloy part matrix be connected more reliable, firm, avoided loosening, obscission take place, and can also solve the difficult problem that connected piece can be taken silk braid out of in the lump in the prior art well when screwing out the aluminum alloy part matrix.Because the manufacturing of the internal and external threads of silk braid can be arbitrarily in the utility model, does not require that internal and external threads must have unified pitch, therefore, its application area is wider, and makes processing also than being easier to, and gives and must bring very big convenience by interconnective part.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is that the K of Fig. 1 is to view.

Embodiment

Embodiment of the present utility model: shown in accompanying drawing 1,2, it is made of latch 1 and silk braid 2, inside and outside surface at silk braid 2 has internal thread and outside thread respectively, front end 1/3～2/3 place at silk braid 2, be provided with screw thread and close up 3, this screw thread closing in 3 can produce self-locking action by the internal thread to silk braid 2 when the aluminum alloy part matrix is connected with other parts, make connection more firmly, reliably.Latch 1 is used for silk braid 2 is fastened on the aluminum alloy part matrix, not only can effectively strengthen the pretightening force of connected piece when being screwed into the aluminum alloy part matrix, can prevent when connected piece screws out that also silk braid 2 from being taken out of in the lump simultaneously.

Claims

1. self locking-type screw insert, it is made of latch (1) and the silk braid (2) that has an internal and external threads, it is characterized in that: be provided with screw thread and close up (3) on silk braid (2), latch (1) connects silk braid (2) and silk braid (2) is fastened in the aluminum alloy part matrix.

2. self locking-type screw insert according to claim 1 is characterized in that: described screw thread closing in (3) is positioned at front end 1/3～2/3 place of silk braid (2).