CN2242362Y

CN2242362Y - Bolt with locking function

Info

Publication number: CN2242362Y
Application number: CN 95238240
Authority: CN
Inventors: 于志刚
Original assignee: Changsha City No2 Standard Parts Factory
Current assignee: Changsha City No2 Standard Parts Factory
Priority date: 1995-12-15
Filing date: 1995-12-15
Publication date: 1996-12-11
Anticipated expiration: 2005-12-15

Abstract

The utility model relates to a standard fastening piece, particularly an anti-loosening screw bolt. The utility model is characterized in that the tail end of the screw thread of the screw bolt is provided with a center hole and an equal division slot, wherein, the equal division slot passes through the center hole to equally divide the cross section of the screw thread in a radial mode. When the anti-loosening screw bolt is used, a pin is knocked into the center hole. The functional diameter of the screw thread of the screw bolt is enlarged by the equal division slot, thereby, a nut is tightly expanded to obtain an anti-loosing purpose, and the exercise amount of the screwing out direction of the nut is more, expansion force is larger, so the loosening and the shedding caused by the vibration of the nut is completely avoided, and the safe reliability of the connection of the screw thread is ensured.

Description

Chek bolt

The utility model relates to standard fasteners, specifically is chek bolt.

Existing thread connection anti-loose method is a lot, uses the more general following several types that mainly contains:

1, thread profile changes class: this method mainly is with the change of standard thread tooth form, relies on the mutual tensioner effect between the thread, increases running torque and locking.Defective is: screw in difficulty of assembling.

2, inserts class: this method mainly is that metal insert or non-metallic insert are added in the special nut body, relies on the elastic pressure effect of inserts, strengthens running torque and locking.Its defective is: the processing charges height screws in difficulty of assembling.

3, thread interference type: this method mainly is with the nut body separated into two parts, makes wherein a part of thread generation axial displacement by pressure processing, utilizes thread interference and locking.Its defective is: the processing charges height requires the higher bolt of fit dimension precision.

In sum, though existing anti-loose method can satisfy the fitness for purpose of locking thread, it is bigger that ubiquity the assembling difficulty, the user cost problem of higher.The more important thing is that all anti-loose methods can not guarantee that all nut can be come off by the shake pine, in other words, can not guarantee the complete reliability that is threaded under the vibrations condition.

The purpose of this utility model proposes a kind of chek bolt at the problems referred to above exactly, and its special construction can prevent that fully nut is because of produce loosening of vibrations with come off.

The technical solution of the utility model is: the screw thread tail end at bolt has center hole and five equilibrium groove, and wherein the five equilibrium groove passes center hole and with thread cross-section five equilibrium radially.

In technique scheme, owing to have center hole and five equilibrium groove, during use, pin is squeezed in the center hole at the screw thread tail end of bolt, enlarged the functional diameter (FD) of bolt thread by the five equilibrium groove, thereby the nut tensioning has been reached locking purpose.Simultaneously because the effect of pin, on the bolt threaded function enlarged-diameter amount with to the screw thread tail end apart from becoming to successively decrease relation, so, the back-out direction amount of exercise that is spun on the nut on the bolt is many more, tension force is big more.So prevented that fully nut is because of produce loosening of vibrations with come off.

The width of five equilibrium groove of the present utility model is less than the internal diameter of center hole, like this, in the time of in pin is squeezed into center hole, forcibly enlarged the width of the five equilibrium groove on the bolt, thereby be easy to enlarge easily the threaded function diameter on the bolt, reached locking purpose.

The degree of depth of five equilibrium groove of the present utility model and center hole is all less than the length of the helical thread portion of bolt, like this, preparation process is simple under the topic before reaching locking purpose, and is convenient, and to the loss of strength of plain bolt seldom, especially for the almost not loss of intensity of shearing resistance type bolt.

Therefore, the chek bolt structural design that the utility model provides is simple, rationally, has very strong anti-loose ability, during actual the use, can guarantee fully that nut can not become flexible even comes off because of vibrations, guarantees the safety reliability of scyewed joint.

Below in conjunction with embodiment accompanying drawing is described in detail.

At first accompanying drawing is described:

Fig. 1 represents plane structure chart of the present utility model;

The plan view of Fig. 2 presentation graphs 1;

Fig. 3 represents user mode figure.

Referring to Fig. 1, Fig. 2, the utility model has a center hole (2) at the screw thread tail end of bolt (1), and the axis of center hole (2) overlaps with the axis of thread.Also have five equilibrium groove (3), five equilibrium groove (3) passes center hole (2) with thread cross-section five equilibrium radially, shown in Figure 2ly has one and waits branch groove (3) that thread cross-section radially is divided into two parts.Can also be designed to two or many as required.Wherein the width of five equilibrium groove (3) is less than center hole (2) internal diameter, and the degree of depth of center hole (2) and five equilibrium groove (3) is all less than the length of the helical thread portion of bolt (1).Its use is seen shown in Figure 3: when nut (4) and bolt (1) acting in conjunction, with connected piece (5) and (6) fastening after, pin (7) is squeezed in the center hole (2), the width of the five equilibrium groove (3) on the mandatory expansion bolt (1), thereby enlarged the threaded function diameter on the bolt (1), and with nut (4) tensioner, nut (4) can not become flexible because of vibrations, because the effect of pin (7), make the back-out direction amount of exercise of nut (4) many more, expanding force is big more, so prevented the loosening of nut (4) fully and come off.

Claims

1, a kind of chek bolt is characterized in that having center hole (2) and five equilibrium groove (3) at the screw thread tail end of bolt (1), and wherein five equilibrium groove (3) passes center hole (2) with thread cross-section five equilibrium radially.

2, chek bolt according to claim 1 is characterized in that the internal diameter of the width of five equilibrium groove (3) less than center hole (2).

3, chek bolt according to claim 1, the degree of depth that it is characterized in that five equilibrium groove (3) and center hole (2) are all less than the length of the helical thread portion of bolt (1).