SU1567809A1 - Threaded joint - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in conditions of increased loads and vibrations. The aim of the invention is to increase the reliability of the connection and reduce its material consumption. The threaded joint contains male and female elements and a helical insert between them. The spiral insert is made with a cross section that varies over the length of the sweep and is coupled with one of the parts along the conical surface. The top of the cone faces the supporting end of the enclosing element. When the nut is tightened, its thread acts on the turns of the spiral insert, trying to move them in the axial direction. Here, due to the conical interface surface, the axial forces are partially transformed into radial and the coils of the insert are deformed. As the strains deform, the load is redistributed between all the threads and the connection is stopped. 9 il.

Description

one

(21) 3655280 / 25-27

(22) 10/19/83

(46) 05.30.90. Bksh. № 20 (72) B.I. Kolesnikov

(53) 621.882.59 (088.8)

(54) THREADED CONNECTION

(57) The invention relates to mechanical engineering and can be used in conditions of increased loads and vibrations. The aim of the invention is to increase the reliability of the joint and reduce its material consumption. The threaded joint contains a male and female elements and a spiral insert inserted between them.

The spiral insert is made with a cross section that varies over the length of the sweep and is coupled with one of the parts along the conical surface. The top of the cone faces the supporting end of the enclosing element. When the nut is tightened, its thread acts on the spiral insert wheel, trying to move them in the axial direction. Here, due to the conical interface surface, the axial forces are partially transformed into radial ones and the coils of the insert are deformed. As the strains deform, the load is redistributed between all the threads and the connection is stopped. 9 il.

S (l

The invention relates to mechanical engineering and can be used in conditions of increased loads and vibrations.

The purpose of the invention is to increase the reliability of the connection.

On fng.1 shows a threaded connection, cut; figure 2 - scan spiral insert; in FIG. 3, view A in FIG. 2; figure 4 - threaded connection, cut, with the sealing of the ends of the spiral insert in the bolt and nut; figure 5 - section bb in figure 4; figure 6 is a section bb In figure 4; in fig. 7- threaded connection, cut, with a conical surface made in the nut; Fig. 8 shows a threaded connection, a slit, with conical surfaces made in a bolt and a nut; figure 9 - threaded connection, cut, with a conical surface,

made in the nut in combination with the well-known insert.

The threaded connection (Fig. 1) comprises a nut 1 and a bolt 2 with a conical surface 3 formed at its end with a top located on the side of the bolt head, between which spiral insert 4 is installed.

The spiral stand is made with a cross section that varies over the length of the helix (Fig. 2) and is fixed to the surface of the case with glue (Fig. 1) or embedded with the end 5 in the hole 6 (Fig. 4 and 6) made in the body of the bolt. The end 7 (Fig. 3) of the insert is bent to prevent the nut from loosening.

In another embodiment (Fig. 7), a nut is made with a conical surface or (Fig. 8) and a bolt and a nut with the installation of the second mentioned spiral

SP

oe 1

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about with

variable cross section inserts or (FIG. 9) of a known helical insert.

Threaded connection works in a blind way.

When tightening the nut 1 (Fig. 1), the thread acts on the turns of the wire, trying to move them up. Thanks to the cone, which, acting as a wedge mechanism, transforms partly axial forces into radial, the turns of the insert A are deformed, uniformly redistribute the load between all the threads of the thread, and the connection is locked.

FIG. one

FIG. 2

Claims (1)

Invention Formula A threaded connection of parts comprising a male and female elements and a spiral threaded insert mounted between them, characterized in that, in order to reduce material consumption and increase the reliability of the connection, the threaded insert is made with a variable cross section along the length of the sweep and is associated with one of the parts along the conical surface with the top of the cone facing the supporting end of the enclosing element. Type A Fig.z 6-6 FIG. five in-c FIG. five FIG L FIG. 7 FIG. eight FIG. 9