Blocking and antiunloading nut

Abstract

The invention relates to a fastener, in particular to an anti-loosening and anti-unloading nut, comprising a nut body and an outer cover, an inner screw hole is arranged at the center of the nut body; at least one screw hole is arranged on the upper surface of the nut body A fastening groove, the fastening groove is surrounded by a downwardly inclined guide surface and a blocking surface; a cavity is provided at the center of the outer cover, and a force-receiving part is provided at the outer wall of the outer cover. The inner wall of the upper surface of the outer cover is provided with the same number of elastic pieces as the fastening grooves, the elastic pieces are inclined downward and can extend into the fastening grooves; the nut body is installed in the cavity of the outer cover middle. The invention has the advantages of easy screw-in, no jamming and no slippage during the screw-in process due to abrasion caused by excessive force.

Description

technical field [0001] The invention relates to a fastener, in particular to an anti-loosening anti-unloading nut. Background technique [0002] The anti-dismounting nut in the prior art is axially symmetrical to make two arc grooves from deep to shallow on the wall of the inner screw hole. The axial length of the groove is generally 2.5 to 4.5 pitch, and a pin is installed in the groove respectively. Or steel balls, and then use core plugs and end retaining rings to fix the relative positions of pins or steel balls. [0003] The shortcoming of this type of anti-loosening anti-unloading nut is: (1) arc grooves are opened on the wall of the inner screw hole, which greatly damages the thread, reduces its due performance, and is not suitable for fastening. (2) The pin or steel ball is easily pushed out of the arc groove along with the screwing of the nut body, thereby losing the anti-unloading function. (3) The pin pin is also easy to block the anti-unloading nut obliquely an...

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of this type of anti-loosening anti-unloading nut are: (1) arc grooves are opened on the wall of the inner screw hole, which greatly damages the thread, reduces its due performance, and is not suitable for fastening

(2) The pin or steel ball is easily pushed out of the arc groove as the nut body is screwed in, thus losing the anti-unloading function

(3) The pin pin is also easy to block the anti-unloading nut obliquely and horizontally in the arc groove as the nut is screwed in, so that it cannot be screwed in again; the round steel ball is also easy to block the nut in the depth section of the arc groove, so that it can no longer be screwed in

(4) When this type of nut is connected to the threaded pair of steel parts, it usually needs to use an extended bolt, and then it is equipped with a washer, a fastening nut, an anti-unloading nut, and a fastening nut. The structure is complex and the assembly is cumbersome.

But the shortcoming of this kind of anti-theft anti-unloading nut is also obvious, because ratchets are arranged at the ring-shaped inner wall of the overcoat and the ring-shaped outer wall of the nut body, the distance between the two is small, and the ratchet is easily worn due to the limitation of the steel used. And the elasticity is small, in the process of fastening and screwing in, it is easy to cause the sharp teeth of the ratchet to wear due to the large force, so that the two can no longer be closely matched, and slipping will occur during the fastening process, which cannot produce better fastening

In addition, the anti-theft effect of this kind of anti-loosening and anti-unloading nut is also poor. Just use a larger wrench to bite the outer cover with a little force, and the ratchet mechanism of this anti-theft bolt can be locked, so that the outer cover and the main body of the nut are screwed in. And in the process of unscrewing, there will be no slippage, even if it loses the anti-theft ability

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