A kind of special eccentric locking nutTechnical field
The present invention relates to a kind of securing member more particularly to a kind of special eccentric locking nuts.
Background technology
The fastening means of plain bolt nut connection has the history of centuries, it is widely used in human being's production, lifeVarious aspects, because concerning the security of the lives and property, therefore bolted loosing Prevention Technology is always people studies the emphasis captured, butEven to this day, various locking measures are all unsatisfactory, suffer from different degrees of defect.Therefore, it should which a kind of new skill is providedArt scheme solves the above problems.
Invention content
The purpose of the present invention is：Against the above deficiency, a kind of reasonable for structure, good Camlock spiral shell of anti-loosing effect is providedIt is female.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of special eccentric locking nut, including locking nut and eccentric nut and with locking nut, eccentric nutMatching used bolt, the upper surface of the eccentric nut have the boss upwardly extended, and the lower face of the locking nut is setThere are the recess hole coordinated with the boss, the central axis of the boss of eccentric nut different from the central axis where its screw threadThe heart, the central axis and the central axis where its screw thread of the recess hole on locking nut are concentric, the interior spiral shell on eccentric nutThe tooth bottom of line is formed with 30 degree of tapered ramp, when the bolt and eccentric nut are mutually tightened, the externally threaded tooth on boltAt the tapered ramp, the lower face of the locking nut is equipped with washer on pinnacle, the washer and locking nut one atType.
Further technical solution is：
The thread tolerance of the bolt is 6H/6g.
The boss is cone boss, and the recess hole is conical socket.
It is furthermore preferred that
The boss is identical with the taper of recess hole.
Due to the application of above-mentioned technical proposal, the present invention has the following advantages that compared with prior art：
1, eccentric locking nut of the invention, since the tooth bottom of the internal thread on eccentric nut is formed with 30 degree of wedge shapeInclined-plane, when bolt and eccentric nut are mutually tightened, the externally threaded cusp on bolt is withstood at the tapered ramp, to produceProdigious coupling mechanism force is given birth to.Due to the angulation change of internal thread thread form on eccentric nut, produced by making to be applied to and contacting between screw threadNormal force and bolt contour be in 60 degree of angles, rather than 30 degree of angles as regular screw threads.Obvious eccentric nut screw thread normal directionPressure is far longer than fastening pressure, and therefore, generated locking frictional force also just greatly increases.Meanwhile it is outer on boltWhen the internal thread with eccentric nut is engaged, external screw thread is fully engaged against screw thread cusp with internal thread, greatly increases its contactArea makes being distributed in the helix overall length of contact for uniform load, when avoiding common standard threaded engagement, 80% or moreFull payload concentrates the phenomenon on the flank for acting on the first and second teeth.Therefore the eccentric locking nut of the present invention not only overcomesPlain nut is easy to the disadvantage from pine under vibrating conditions, but also can prolong the service life.
2, eccentric locking nut of the invention is equipped with washer, and washer and locking nut on the lower face of locking nutIt is integrally formed, such structure design, the pulling force bigger that on the one hand can bear compared to common nut, firmness is more preferable；On the other hand due to being provided with washer on the lower face of locking nut, when installation locking nut, spanner would not touchAlready installed eccentric nut, the operability of entire operation is just greatly improved in this.
Description of the drawings
Attached drawing 1 is schematic structural view of the invention.
Attached drawing 2 is eccentric nut dimensional structure diagram.
Attached drawing 3 is locking nut dimensional structure diagram.
In the figures above：1, locking nut, 2, eccentric nut, 3, bolt, 4, boss, 5, recess hole, 6, tapered ramp, 7,Washer.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and embodiments：
Embodiment one：
As shown in Figs. 1-3, a kind of special eccentric locking nut of the present invention, including locking nut 1 and eccentric nut 2 andWith locking nut, the matching used bolt 3 of eccentric nut, the upper surface of the eccentric nut 2 has the boss 4 upwardly extended,The lower face of the locking nut 1 is equipped with the recess hole 5 that coordinate with the boss 4, the central axis of the boss of eccentric nut 2 andCentral axis decentraction where its screw thread, central axis and the central shaft where its screw thread of the recess hole 5 on locking nut 1Line is concentric, and the tooth bottom of the internal thread on eccentric nut 2 is formed with 30 degree of tapered ramp 6, the bolt 3 and eccentric nut phaseWhen mutually tightening, the externally threaded cusp on bolt 3 is withstood at the tapered ramp 6, and the lower face of the locking nut 1 is equipped withWasher 7, the washer 7 are integrally formed with locking nut 1.
Preferably, second embodiment as the present invention, the present embodiment is further limiting to embodiment one, describedThe thread tolerance of bolt is 6H/6g.
Preferably, the third embodiment as the present invention, the present embodiment is also further limiting to embodiment one, instituteIt is cone boss to state boss 4, and the recess hole 5 is conical socket and boss 4 is identical with the taper of recess hole 5.
The eccentric locking nut of the present invention, carries out vibration test, plain nut occurs as soon as loosening, double spiral shells for 20 seconds at normal temperaturesMother only occurs as soon as loosening in 30 seconds.On stringent vibration experiment machine, plain nut first loosens, secondly when double nut, a few minutesLoosening also occurs in the nut of U-shaped band spring clip afterwards, after eccentric locking nut only of the invention vibration is for 1 hours stillThere is no loose phenomenon so, so it fundamentally solves the problems, such as loosening of the nut in forced vibration, falls off.
The eccentric locking nut of the present invention, unique structure make locking nut 1 and eccentric nut 2 respectively to connectionBolt generates the radial coupling mechanism force of both direction up and down, connects 3 uniform force of bolt, coupling mechanism force is big, and the more vibrates the more tight, relativelyThere are higher coupling mechanism force and an antifatigue anti seismic efficiency and anti-skidding, anti-dropout ability in traditional nut, locking while does not damageThe screw thread for hindering bolt and nut will not repeatedly be damaged through assembly and disassembly, reusable, while the noise installed is very low, installationIt is steady without friction in the process, the impact to operator can be effectively reduced, the fatigue strength of operator is reduced.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the artFor, without departing from the principles of the present invention, it can also make several improvements or replace, these improve or replaceIt should be regarded as protection scope of the present invention.