CN212657112U

CN212657112U - Conical surface self-locking positive and negative thread anti-loose bolt and nut

Info

Publication number: CN212657112U
Application number: CN202020156117.XU
Authority: CN
Inventors: 林卫东; 林鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-02-08
Filing date: 2020-02-08
Publication date: 2021-03-05
Anticipated expiration: 2030-02-08

Abstract

The utility model discloses a conical surface auto-lock positive and negative screw thread lockbolt nut, including ladder bolt, first nut, second nut, ladder bolt's free end has two sections screw threads, and nearly spiral shell head end is the positive screw thread, and far away spiral shell head end is the derotation screw thread, and the derotation screw diameter is less than the positive screw thread. The first nut and the second nut are attached by conical surfaces, and the conical degrees of the two nuts are consistent and can be tightly attached. The free end of the stepped bolt is provided with two sections of threads, the head end of the stepped bolt is a forward thread, the head end of the stepped bolt is a reverse thread, and the diameter of the reverse thread is smaller than that of the forward thread. The first nut and the second nut are attached by conical surfaces, and the conical degrees of the two nuts are consistent and can be tightly attached. The bolt and the nut are effectively prevented from loosening and loosening, friction, impact resistance and vibration resistance are provided without depending on fastening force between the screw head and the nut, the installation is convenient, and the disassembly is rapid.

Description

Conical surface self-locking positive and negative thread anti-loose bolt and nut

Technical Field

The utility model belongs to the technical field of mechanical fastening and specifically relates to a conical surface auto-lock positive and negative screw thread lockbolt nut.

Background

Bolt and nut connection is a very common fastening connection mode in the mechanical field. But general bolt and nut cooperation mainly relies on fastening force to make the nut locking, and is great shaking, and the stress is complicated, and cold and hot is repeated and receive the impact force's condition down in turn, can take place to become flexible, if overhaul untimely, can cause mechanical equipment's accident. Related relaxation measures are not well solved, and the problems of quick installation, easy disassembly and the like are solved. Therefore, the conical surface self-locking positive and negative thread anti-loose bolt and nut has very important significance for connection and fastening of mechanical equipment.

Disclosure of Invention

In order to overcome among the prior art fastener connect mainly rely on the fastening power, great in vibrations, stress is complicated, and cold and hot relapse and receive under the condition of impact force in turn, can take place not hard up, and the difficult problem of installing and dismantling of relevant locking measure, the utility model provides a rely on positive and negative nut and conical surface complex fastening scheme to realize the purpose of the easy installation of locking taking off antidetonation.

The utility model provides a technical scheme that its technical problem adopted is:

the utility model provides a conical surface auto-lock positive and negative screw thread lockbolt nut, includes shoulder bolt, first nut, second nut, shoulder bolt's free end has two sections screw threads, and nearly spiral shell head end is the positive screw thread, and far away spiral shell head end is the derotation screw thread, and the derotation screw thread diameter is less than the positive screw thread. The first nut and the second nut are attached by conical surfaces, and the conical degrees of the two nuts are consistent and can be tightly attached.

The conical surface of the nut can adopt Morse taper, and the size of the conical surface can be properly changed according to engineering requirements.

First nut cover is on the screw thread is just revolved to the bolt, and the second nut cover is on the screw thread is revolved to the contrary, when fastening, screws up two nut subtend, and because the tapering is very little this moment, the principle that utilizes frictional force can transmit certain moment of torsion, under the effect of vibrations load, if first nut has not hard up trend, then the second nut has the locking trend, utilizes the just derotation of screw thread to play the effect of mutual restriction. Because the mutual restriction effect is irrelevant to the fastening force between the screw head and the nut, the anti-vibration and anti-impact effects can be good, and the anti-vibration and anti-impact screw can be conveniently disassembled under the condition that external force applies opposite torque because of taper fit.

The beneficial effects of the utility model are that, the utility model discloses bolt and nut adopts conical surface auto-lock and positive and negative screw-thread fit, has eliminated traditional bolt and nut connected mode effectively, relies on the fastening force locking, is afraid of vibrations, easily drops, reaches the loaded down with trivial details difficult shortcoming of dismantling of locking flexible measure. The anti-impact and anti-vibration nut realizes friction without depending on fastening force between the screw head and the nut, is convenient to mount and is quick to dismount.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic view of a first nut;

FIG. 3 is a schematic view of a second nut;

in the figure, 1 is a screw head, 2 is a stepped bolt, 3 is a forward thread, 4 is a conical surface, 5 is a reverse thread, 6 is a second nut, and 7 is a first nut.

Detailed Description

The utility model provides a conical surface auto-lock positive and negative screw thread lockbolt nut, includes stepped bolt 2, first nut 7, second nut 6, the free end of stepped screw rod has two sections screw threads, and nearly spiral shell head end is positive screw thread 3, and far away spiral shell head end is

derotation screw thread

5, and 5 diameters of derotation screw thread are less than positive screw thread 3. The first nut 7 is a forward-rotation thread, one side of the first nut is provided with a convex conical surface 4, the second nut 6 is a reverse-rotation thread, one side of the second nut is provided with a concave conical surface 4, and the conical surfaces of the two nuts have the same taper and can be tightly attached.

First nut 7 cover is on the screw thread 3 of just revolving, and second nut 6 covers is on the screw thread 5 of derotation, during the installation, twists first nut 7 earlier, twists second nut 6 again, along with the screw in of second nut 6, the laminating of conical surface 4, because the tapering is very little, the normal stress of conical surface laminating this moment will tens of times in horizontal feed power, produce very big frictional force, utilize the principle conical surface 4 of frictional force can transmit certain moment of torsion, pass to first nut 7, make two nuts auto-locks. Under the action of vibration load, if the first nut 7 tends to loosen, the second nut 6 tends to lock, and the mutual restriction effect is realized by utilizing the positive and negative rotation of the threads. Because the mutual restriction effect is irrelevant to the fastening force between the screw head 1 and the nut 7, the shock-proof and impact-resistant effect is good, and the conical surfaces 4 are matched, so that the screw head can be conveniently disassembled under the condition that the external force applies opposite torque.

Claims

1. The utility model provides a conical surface auto-lock positive and negative screw thread lockbolt nut which characterized in that: the free end of the stepped bolt (2) is provided with two threads, the end close to the screw head (1) is provided with a forward thread (3), the end far away from the screw head (1) is provided with a backward thread (5), the first nut (7) is sleeved on the forward thread (3) of the stepped bolt (2), and the second nut (6) is sleeved on the backward thread (5).

2. The conical surface self-locking positive and negative thread lockbolt nut of claim 1, wherein: the diameter of the back-spin thread (5) at the far screw head (1) end of the stepped bolt (2) is smaller than that of the front-spin thread (3), the first nut (7) and the second nut (6) are attached by adopting conical surfaces, the conical surfaces of the two nuts have the same taper and can be closely attached, and the taper can be adjusted by adopting the Morse taper or according to the actual engineering.