UA23086U - Threaded joint - Google Patents

Abstract

A threaded joint has parts connected to each other with bolt, a nut screwed on bolt and nut lock. Nut lock has threading that has displacement of threading pitch with respect to pitch of bolt threading.

Description

Description of the invention

A useful model refers to general mechanical engineering, namely to the threaded connection of parts.

A known threaded connection containing parts connected together by a bolt and a nut screwed onto the bolt

Dobrovolsky V.A. etc. Details of machines. - M.: Mashgiz, 1962, p. 132, fig. 68). The absence of a nut lock in a threaded connection does not exclude the possibility of self-unscrewing of the nut, especially under dynamic loads, impacts and vibration, which leads to a decrease in the reliability and durability of the threaded connection. 70 A threaded connection is also known, which contains parts connected to each other by a bolt, a nut screwed onto a bolt, and a nut lock (Guzenkov P.G. Machine details. M., Vyissaya school, 1982, p. 75, fig. .6.14, d). In this constructive solution, the nut lock is made in the form of a crown nut and a cotter pin installed in the hole of the end of the bolt rod, located perpendicular to its axis, and in the slot of the crown nut. The presence of a nut lock prevents self-unscrewing of the nut, but its implementation in the form of a crown nut and a cotter pin does not allow to implement and maintain the tightness of the connection of parts (the need to match the hole of the bolt rod and the slots of the crown nut, which is provided for in the nut lock, does not allow to achieve the necessary tightness with "connection of nut tightening parts), which leads to a decrease in the reliability of the threaded connection.

Thus, the basis of a useful model is the task of creating such a construction of a threaded connection, in which, by introducing new elements and their connections, the reliability of the connection would be increased.

The problem is solved by the fact that in a threaded connection containing parts interconnected by a bolt, a nut screwed onto a bolt, and a nut lock, according to a useful model, the nut lock contains a thread having a thread pitch offset relative to the pitch bolt threads, and the ratio of thread pitches is selected from the range of 0.005...0.01.

Equipping the nut lock with a thread, the pitch of which does not coincide with the pitch of the bolt thread, and choosing the ratio of thread pitches from the range of 0.005...0.01 makes it possible to ensure the reliability of the tightness of the connection of parts by the necessary sufficient tightening of the nut and to prevent self-unscrewing of the nut during the operation of the threaded connection due to the frictional forces created by the forces of elastic deformation of the turns of the threads of the nut lock and the bolt. eh

Figure 1 shows a diagram of a threaded connection. Figure 2 shows a diagram of the interaction of the thread of the lock nut with the thread of the bolt.

The threaded connection includes parts 1, 2, each of which has a hole 3, 4, respectively, a bolt 5 installed in the holes 3, 4 of parts 1, 2, a nut 6 screwed onto the bolt 5, and a nut lock 7. Nut lock 7 contains a thread "9 8 (nut thread 6), the pitch of which does not coincide with the pitch of the thread 9 of the bolt 5, and, in order to prevent 39 damage to the threads and the possibility of using them for a further purpose, the difference in the pitches of the threads of the lock nut and the bolt is selected from the condition preventing plastic deformation of threads when screwing a nut onto a bolt.

The threaded connection is made and works as follows. A bolt 5 is installed in the holes 3, 4 of parts 1, 2, on the end of which a nut 6 is screwed. The nut 6 is screwed onto the bolt 5 to the limit necessary to create "sufficient strength and tightness of the connection of the parts. As a result of the difference in the pitches of the thread 8 of the nut lock C 7 and the thread 9 of the bolt 5 in the zone of interaction of the threads, the elastic forces of their turns arise. Frictional forces caused by elastic forces reliably prevent self-unscrewing of the nut during operation of the threaded connection. For

In order to ensure the functionality of the threaded connection during repeated disassembly and reassembly of the threaded connection, the difference in pitch of the threads of the nut lock and the bolt is selected from the condition of preventing plastic deformation of the threads when screwing the nut onto the bolt.

The use of the proposed design of the threaded connection in mechanical engineering allows: di - to expand the range of threaded connections and nut locks; оз - to increase the reliability of the threaded connection due to the possibility of creating the tightness of the connection of parts and further eliminating the weakening of the threaded connection caused by dynamic loads, shocks and vibration; o 20 - to simplify the manufacturing technology of a nut lock of a threaded connection.

Claims (1)

Formula of the invention 99 Threaded connection containing parts connected to each other by a bolt, a nut screwed onto a bolt, and a nut lock, which is characterized by the fact that the nut lock contains a thread that has an offset of the thread pitch relative to the bolt thread pitch, and the ratio of the steps of the cutters is chosen from the range of 0.005...0.01. 60 b5