CN2101133U

CN2101133U - Axial fastening theft proof block nut

Info

Publication number: CN2101133U
Application number: CN 91224563
Authority: CN
Inventors: 刘永熙
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-09-06
Filing date: 1991-09-06
Publication date: 1992-04-08

Abstract

The utility model provides a set of specific intermittent slopes on a cap nut compacting surface, the pre-determined steel balls can be put on the slopes in the cap nut tightening process, and the cap nut is tightened. When the cap nut is loosened back, the steel balls can ascend along the slopes, so the axial tension of the screw bolt can be rapidly increased, and therefore, the cap nut can not be loosened back actually. The utility model is characterized in that the working method is simple. The rotary torque is the same as a common cap nut when the cap nut is tightened, and the rotary torque is not remarkably increased. After tightening the cap nut, the actual loosen back angle is approach to zero, and the utility model can respectively form a detachable (anti-loosing) and a non-detachable (antitheft) threaded coupling according to the use requirements.

Description

Axial fastening theft proof block nut

The utility model prevents when being a kind of can work under vibrational state that nature from getting loose, can prevent again that the people is a kind of special fastening nut of get loose (stolen) under particular environment.

The utility model and existing locking, anti-theft screw cap relatively, following characteristics are arranged: 1. processing method of the present utility model is simple, does not need any special manufacturing procedure, just when the moulding of nut blank, the partial shape of existing forming convax mould is changed a little; 2. the utility model is in the fastening process of nut, and its rotation torque is the same with the moment of torsion of plain nut, and does not significantly increase; 3. the nut that the utility model constituted, after locking, if Hui Song occurs, then fastening force will be multiplied, so unjaming angle convergence what zero actually; 4. the utility model can need constitute removable (locking) and non-disconnectable (antitheft) scyewed joint respectively by using.

The purpose of this utility model provides a kind of threaded connection device locking or antitheft under different usage requirements.

The purpose of this utility model is achieved in that opens one group of axisymmetric, interruption annular slope breach on the screw socket of nut compressing face, this inclined-plane breach is at the oblique angle that axially has 3 °～7 °, have in the horizontal direction one consistent with the lead angle direction, and greater than the lift angle of 2 times of lead angles; The maximum depth of this inclined-plane breach, for anti-theft screw cap, should be less than selected steel ball size 0.05～0.50mm; When nut cooperates with bolt, above-mentioned interruption annular slope breach has just formed one group with bolt and has been interrupted the ring wedge groove, the nominal width of this wedge groove--wedge groove sidewall span to bolt--should be slightly smaller than selected steel ball size for anti-theft screw cap, makes it to form the slight interference fit that (P)/(h) of the different grades of tolerance forms.Screw in the process at nut, selected steel ball is put into the wedge groove, after the nut locking, steel ball will be clamped between the bottom surface and sidewall of packing ring, bolt and nut inclined-plane breach.When artificial time pine, steel ball is because of being tightened the frictional couple that is produced by the bottom surface of above-mentioned packing ring, bolt and nut inclined-plane breach and sidewall, to force steel ball along rising on the nut inclined-plane, because the lift angle on this inclined-plane is greater than 2 times of lead angle, thereby in bolt axis to forming bigger coupling mechanism force, in fact Hui Song can not be occurred, to play antitheft effect.

The utility model is during as jam nut, its nut processing method, and the direction of the axial oblique angle of breach, horizontal lift angle, size are consistent with anti-theft screw cap.But surface width then should be more a lot of greatly than selected steel ball size, so that after nut locking, steel ball is pressed between nut and the packing ring, and can not be clamped on the sidewall of bolt and breach.Be the frictional force of the frictional force between steel ball after nut is locked and the packing ring much larger than steel ball and nut inclined-plane breach, so should on packing ring, make an annular groove, the width of groove should be slightly smaller than selected steel ball size, the slight interference fit that its (P)/(h) that can form the different grades of tolerance is formed, the degree of depth equals the steel ball radius, the maximum depth of the inclined-plane breach of nut is then less than selected steel ball radius 0.05～0.50mm, enough crush are arranged when nut is tightened, and force steel ball to be clamped among the packing ring groove.Since the frictional force perseverance between packing ring and the fastener greater than and nut between frictional force, so in working order down, vibration can only make nut produce the trend of rotation (Hui Song), in a single day packing ring does not then have this trend, and is when Hui Song occurring, the same with anti-theft screw cap, steel ball will be along rising on the inclined-plane of nut, axial fastening force is increased rapidly, in fact Hui Song can not be occurred, to play locking effect.If nut and packing ring rotate synchronously, steel ball will remain static with respect to nut, so just not have locking effect, and can disassemble nut, for the purpose of convenient disassembly, so the plane shape size of jam nut packing ring should be made the hexagon identical with nut.

Can certainly be opposite with top method, promptly one group axisymmetric, be interrupted the annular slope breach and open on packing ring, can play the anti-loose anti-theft effect equally, but on nut, will drive a circular groove, otherwise locking, antitheft effect will obviously descend.

The utility model only needs in the forming process of nut blank, after making 2～3 axisymmetric interruption annular slope breach on the blank end face simultaneously, again by the processing of normal process program.So concerning a Standard Component Factory, do not increase any additional process, do not need to increase any equipment yet.

Concrete structure of the present utility model is drawn by following examples and accompanying drawing thereof:

Fig. 1 is the anti-theft screw cap working state figure according to the axial lock compact form anti-loose anti-theft nut that the utility model proposes.

In Fig. 1, one group of axisymmetric is arranged on the seal face of nut ［ 1 ］, be interrupted the diameter 0.05～0.50mm of the maximum depth h of annular slope breach ［ 2 ］ less than selected steel ball ［ 4 ］, the width b of breach ［ 2 ］ should guarantee that formed nominal width is slightly littler than the diameter of steel ball ［ 4 ］ after bolt ［ 3 ］ is screwed into nut ［ 1 ］, and forms the slight interference fit of (P)/(h) composition of different brackets.The lift angle β of inclined-plane breach ［ 2 ］ is consistent with the direction of the lead angle α of nut ［ 1 ］, but β＞2 α, the angle of sides of breach ［ 2 ］ is 3 °～7 °, so that nut ［ 1 ］, steel ball ［ 4 ］ and packing ring ［ 5 ］ be before compressing, steel ball ［ 4 ］ unlikely stuck inclined-plane breach ［ 2 ］ with bolt ［ 3 ］ thus between the increase additional torque.After nut ［ 1 ］ locking, then steel ball ［ 4 ］ is clamped between the bottom and sidewall of bolt ［ 3 ］, packing ring ［ 5 ］ and breach ［ 2 ］.Therefore when nut ［ 1 ］ returns pine, to the formed frictional couple of steel ball ［ 4 ］, will force steel ball ［ 4 ］ to roll along the inclined-plane of inclined-plane breach ［ 2 ］ by part ［ 2 ］, ［ 3 ］, ［ 5 ］.But the lift angle β on inclined-plane＞2 α, so the pulling force that the bolt as a result ［ 3 ］ of Hui Song is born will increase sharply rapidly, so Hui Song just can not occur, thereby played antitheft effect.

Fig. 2 is the jam nut working state figure according to the axial lock compact form anti-loose anti-theft nut that the utility model proposes:

In Fig. 2, have the inclined-plane lift angle β of one group of axisymmetric, interruption annular slope breach ［ 7 ］, breach ［ 7 ］ on the seal face of nut ［ 6 ］ ₁Consistent with the direction of the lead angle α of nut ［ 6 ］, but β ₁＞2 α; The surface width of breach ［ 7 ］ should be enough to guarantee can a gap delta all be arranged with the sidewall and the bolt ［ 3 ］ of breach ［ 7 ］ after steel ball ［ 4 ］ is compacted; The maximum depth h of inclined-plane breach ［ 7 ］ ₁Should be less than the radius 0.05～0.50mm of selected steel ball ［ 4 ］, on the seal face of packing ring ［ 8 ］ and nut ［ 6 ］ circular groove ［ 9 ］ is arranged, the width a of groove ［ 9 ］ is slightly smaller than the diameter of steel ball ［ 4 ］, makes it to form with steel ball ［ 4 ］ the slight interference fit of (P)/(h) composition of different brackets.Degree of depth h ₂Should equal the radius of steel ball ［ 4 ］.After nut ［ 6 ］ is tightened, steel ball ［ 4 ］ will be clamped among the circular groove ［ 9 ］ of packing ring ［ 8 ］, and the frictional force of groove ［ 9 ］ and steel ball ［ 4 ］ will be greater than the frictional force of inclined-plane breach ［ 7 ］ Yu the steel ball ［ 4 ］ of nut ［ 6 ］.When nut ［ 6 ］ returns pine, steel ball ［ 4 ］ will rise along inclined-plane breach ［ 7 ］, and the pulling force that bolt ［ 3 ］ is born increases exponentially rapidly, so nut ［ 6 ］ in fact Hui Song can not occur, therefore play locking effect.For jam nut ［ 6 ］ is dismantled, the plane shape of packing ring ［ 8 ］ should be made hexagon, so that when dismantling, can rotate synchronously with nut ［ 6 ］.Because have only nut ［ 6 ］ and packing ring ［ 8 ］ when rotating synchronously, steel ball ［ 4 ］ just can remain static with respect to inclined-plane breach ［ 7 ］, and dismounting could be carried out smoothly.

Claims

1, the feature of axial lock compact form anti-loose anti-theft nut is: open one group of axisymmetric interruption annular slope breach on the nut compressing face, this breach has consistent with the lead angle direction in the horizontal direction, and greater than the lift angle of 2 times of lead angles, when nut is tightened, in above-mentioned breach, respectively put into a steel ball of choosing in advance, when the nut after tightening returns pine then steel ball rise and increase the bolt axial tension along above-mentioned inclined-plane breach and carry out to stop Hui Song.

2, axial lock compact form anti-loose anti-theft nut according to claim 1, it is characterized in that for guarantee that steel ball can rise along the inclined-plane breach when nut returns pine, to anti-theft screw cap is after nut is tightened, and steel ball is clamped between the bottom surface and sidewall of packing ring, bolt and nut inclined-plane breach.

3, axial lock compact form anti-loose anti-theft nut according to claim 1, it is characterized in that then on packing ring, making an annular groove in advance for jam nut, then steel ball is compressed and is stuck on the circular groove of packing ring by the inclined-plane breach of nut after nut is tightened, when nut is dismantled, should guarantee that nut and packing ring rotate synchronously.

4, axial lock compact form anti-loose anti-theft nut according to claim 1, it is characterized in that if one group of axisymmetric interruption annular slope breach is opened on packing ring, and on nut, open an annular groove, and steel ball is pressed into therebetween, can play anti-loose anti-theft equally.