SU1213272A1 - Threaded joint - Google Patents

Description

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The invention relates to mechanical engineering and can be used to connect machine parts and equipment.

Objective | 5 of the invention is to increase the reliability of the joint under the action of alternating loads and vibrations.

The drawing shows a threaded connection, a general view.

The threaded connection contains connectable parts 1 and 2, a bolt 3 is installed in the holes in KOTjapfeix, it has steps 4 and. 5 with opposite thread and nut 6.

Stage 5 threads are made; on the section located on the side of the head of the bolt and has a larger angle of elevation of the turn than the angle of elevation of the turn of the thread of the step 4. In hole 7 of the connected part 1 performed on the thread corresponding to the thread of the step 5 of the bolt in detail on this thread.

The assembly of the threaded connection is carried out as follows.

The bolt is screwed into the threaded hole of the connected part 1 and held in this position, then the second part is installed and the nut is screwed on.

Compiled by V.Panyushknn Editor M.Petraga Tehred A.Kikemezey

768/47

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VNIIPI USSR State Committee

but in matters of inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

F1 piap Patent, i-. Uzhgorod, st. Project, 4

13272

When acting on a threaded connection of variables in the direction of loads or vibration processes, a periodic

5- change of thread tightening force. Since in this case the corresponding change in reactive forces somewhat delays in time from the change in tightening force, the equilibrium between

10 of them in these moments are broken

and this, in connection with the wedge-shaped character of the thread, leads to a periodic self-expanding joint. Since the elevation angle of the turn of the thread 15 would be the step 5 greater than the elevation angle of the turn of the step 4, the shear force at the step 5 is greater than that of the step 4. Therefore, a turn on the self-unscrewing of the bolt 3 along the thread of the step 5 occurs.

However, due to the opposite direction of the threads in steps 4 and 5, the end of the bolt is simultaneously screwed into the nut, automatically retaining the original stop of the thread. Turning the nut is eliminated because

3Q what is the moment of friction at the end of the nut

more than the moment of friction in the thread stage 5.

Corrector 0.Lugov

Claims (1)

THREADED CONNECTION, containing connected parts with holes, a bolt installed in them with two opposite threaded sections and a nut, characterized in that, in order to increase the reliability of the connection under the action of alternating loads and vibrations, one of the threaded sections is located under the bolt head and has a greater angle of elevation of the thread thread than the angle of the thread of the main thread of the bolt, while the hole in the part. located under the head of the bolt, made threaded. (P).