UA23059U - Threaded joint - Google Patents

Abstract

Threaded joint has parts connected to each other with bolt, a nut screwed on the bolt and nut lock. Nut lock is expanded at the end of the bolt rod, this has opening arranged coaxially with the axis of the bolt.

Description

Description of the invention

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

A threaded connection is known, which includes parts connected to each other by a bolt, a nut screwed onto the bolt, the connected parts with a hole, a bolt installed in the holes of the parts, 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 connected parts with a hole, a bolt installed in the holes of the parts, a nut screwed onto the bolt, and a nut lock (Guzenkov P.G. Details of machines. 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 execution 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 the bolt, and a lock nut, according to a useful model, the lock nut is flared at the end of the bolt shaft, which has a hole, made coaxially with the axis of the bolt, and the depth of the hole is selected from the condition:

I -H(2...5)mm, - where I is the depth of the hole; H is the length of the end of the bolt that protrudes beyond the nut when screwing it onto the bolt (before the end of the bolt rod is flared).

Flaring the nut lock at the end of the bolt rod, which has a hole made coaxially with the axis of the bolt, makes it possible to ensure the reliability of the tightness of the connection of parts by the necessary sufficient tightening of the nut. Me.

Choosing the depth of the hole at the end of the bolt rod from the condition: І -Н(2...5) mm allows to ensure the necessary strength of the threaded connection (the hole does not weaken the working section of the bolt).

Figure 1 shows a diagram of a threaded connection. Figure 2 shows the design of the bolt. at

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. At the end bolt rod 5 along its axis 39 and a hole 8 is made coaxially with it. Nut lock 7 is made by flaring the end of the bolt rod 5.

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. After that, the end of the bolt 5 C protruding beyond the nut is flared, forming a nut lock 7, which reliably prevents the nut from unscrewing itself. When the tightness of the threaded connection is weakened, the nut is additionally tightened, and the end of the bolt 5

"Iz" is further expanded, which ensures the necessary reliability of the threaded connection. The selection of the depth of the hole 8 in the bolt rod 5 from the condition: И -Н(2...5) mm allows to ensure the necessary strength of the threaded connection as well (the hole does not weaken the working section of the bolt).

If it is necessary to disassemble the threaded connection, the nut lock 7 is crimped and the nut 6 is unscrewed from the bolt 5. The use of the proposed design of the threaded connection in mechanical engineering allows: - to expand the assortment of threaded connections and nut locks; si - to increase the reliability of the threaded connection due to the possibility of creating a connection tightness with 20 parts and further elimination of the loosening of the threaded connection caused by dynamic loads, shocks and vibration; c - to simplify the technology of manufacturing a nut lock of a threaded connection.

Claims (1)

Formula of the invention - A threaded connection containing parts connected together by a bolt, a nut screwed onto the bolt, and a lock nut, which is characterized by the fact that the lock nut is rolled at the end of the bolt shaft, which has a hole made coaxially with the axis bolt, and the depth of the hole is selected from the condition: 60 I - ANzh(2...5) mm, where I. is the depth of the hole; H is the length of the end of the bolt protruding beyond the nut when screwing it onto the bolt (before the end of the bolt rod is flared). b5