CN2295070Y

CN2295070Y - Anti-loose screw bolt

Info

Publication number: CN2295070Y
Application number: CN 96213577
Authority: CN
Inventors: 王文刚; 刘洪杰
Original assignee: CHANGZHI ELECTROMECHANICAL INDUSTRY SCHOOL
Current assignee: CHANGZHI ELECTROMECHANICAL INDUSTRY SCHOOL
Priority date: 1996-06-14
Filing date: 1996-06-14
Publication date: 1998-10-21
Anticipated expiration: 2006-06-14

Abstract

The utility model provides an anti-loosing screw bolt. An inclined surface is arranged on the surface of one side which thread teeth of the screw bolt bear. Both endpoints of the inclined surface are respectively positioned on the pitch line and minor diameter line of the original standard threads, and the distance of the two endpoints, which is at the axial direction of the screw bolt, is equal to a half of the thread pitch of the threads. The width of tooth roots of the threads is smaller than the width of tooth roots of the standard threads. The utility model has the advantages of simple structure, reliable anti-loosing performance, convenient design, convenient manufacture, and convenient detection.

Description

Locking spiral shell

The utility model relates to a kind of mechanical coupling bolt, especially a kind of chek bolt of becoming flexible of preventing after fastening by the work pretightening force.

The anti-loose method of Bolt Connection has many, mainly is divided into locking, the mechanical locking and destructive locking three major types of friction, in the concrete locking measure of the prior art, and the complex structure that has, the anti-loosing effect that has is unreliable.

For the anti-loosening property that makes bolt improves, do not make the structure of Bolt Connection become complicated again, the scheme that changes with regard to the screw thread of handlebar screw bolt and nut in the prior art, as the disclosed technological scheme of China Patent No. ZL91232005.2, though this improvement can improve its anti-loosening property, but because the equal nonstandardized techniques of parameter such as the path of the screw thread after improving, middle footpath, result in hand cramps for design, manufacturing and detection, simultaneously, such bolt and nut has directivity revolving timing, and giving to use has also increased inconvenience.

The purpose of this utility model is to improve the deficiencies in the prior art, provides a kind of simple in structure, and anti-loosening property is reliable, design, manufacturing and chek bolt easy to detect.

The purpose of this utility model is to realize like this, on the face of carrying one side of the worm tooth of bolt, establish an inclined-plane, the two ends on this inclined-plane lay respectively on the middle line and little radial line of primary standard screw thread, and two-end-point equals thread pitch half in the distance of bolt axial direction.On the little radial line of standard thread, the tooth bottom width degree of screw thread is less than the tooth bottom width of standard thread at the bottom of the tooth of screw thread.When the numerical value of the Major Diam of the angle that is positioned at the side that is equivalent to this screw thread more than the primary standard effective diameter of thread position and this screw thread connects with the nut of standard thread with the bolt when this screw thread, do not collide and hinder to screw and be as the criterion with the screw thread of nut.

The bolt that provides with the utility model and the nut of standard thread screw fastening object mutually, after screwing, the tip of thread of nut promptly is against on the described inclined-plane, nut will be in height radial dilatation state under the effect of the power of impelling its radial dilatation that pretightening force produced, at this moment because the easiest loosening also survivable above-mentioned equilibrium of forces of radial force of scyewed joint that makes that factors such as vibration are imported into from the external world, so, nut will be difficult for radial-play, friction between the screw bolt and nut just can not reduce yet, frictional resistance moment also can not reduce, therefore, nut will can not become flexible revolution.

The chek bolt that the utility model provides, because establishing an inclined-plane on the supporting plane of worm tooth both can guarantee reliable anti-loosening property, simultaneously because screw thread is reference value in the position in the middle footpath of path and primary standard screw thread (two end points on described inclined-plane), then design, make and detect all and be easy to, this bolt does not have the directivity requirement when screwing with the standard thread nut in addition, so provide convenience for the user yet.

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

Fig. 1: the plan view of the utility model bolt

Fig. 2: the utility model bolt thread tooth form schematic representation, dotted line is the standard thread profile line on it

Fig. 3: the nut of the utility model bolt and standard thread screws the structural representation behind the pretension

Embodiment

As shown in Figure 1, 2, the non-bearing face 1-1 of the screw thread of bolt 1 is a standard thread, establish an inclined-plane 1-2 on its supporting plane, the end points 1-2-1 of inclined-plane 1-2 is positioned at the bottom of the tooth, just on the symmetry axis 2 of the tooth kerve of the primary standard screw thread on the screw thread path 4, its another end points 1-2-2 is arranged on the symmetry axis 3 of the primary standard worm tooth on footpath 5 lines of primary standard screw thread, between end points 1-2-1 and the end points 1-2-2 promptly is half of pitch like this in the distance of the axial direction of bolt 1.The above tooth side 1-3 to Major Diam of end points 1-2-2 is parallel with the tooth side of primary standard screw thread, the diameter in big footpath 6 , D is the big footpath of primary standard screw thread in the formula, and P is a pitch, and Fig. 3 promptly is the structural representation after the nut 7 of this bolt 1 and standard thread screws pretension.

Claims

1, a kind of chek bolt, it is characterized in that: on the face of carrying one side of the worm tooth of bolt, establish an inclined-plane, the two-end-point on this inclined-plane lays respectively on the middle line and little radial line of primary standard screw thread, and two-end-point equals thread pitch half in the distance of bolt axial direction, on the little radial line of standard thread, the tooth bottom width degree of screw thread is less than the tooth bottom width of standard thread at the bottom of the tooth of screw thread.

2, chek bolt according to claim 1 is characterized in that: the end points on the little radial line on described inclined-plane drops on the symmetry axis of standard thread tooth kerve, and the end points on middle line drops on the symmetry axis of standard thread tooth.

3, chek bolt according to claim 2 is characterized in that: the Major Diam of described bolt is that the big footpath of standard thread value deducts pitch Doubly.