RU2282066C2 - Immovable connection for cylindrical parts - Google Patents

Abstract

FIELD: mechanical engineering, in particular, connection which may be used in recovery and repair of cylindrical parts.

SUBSTANCE: connection has thin-wall bushing consisting of number of inserts. One inserts are glued to shaft while other inserts are glued to part surface equipped with opening. Antifriction covering is applied to surface of each insert opposite glued surface.

EFFECT: reduced effect of fretting corrosion on durability of connection, simplified disassembling and prevention of joined parts from slippage.

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Description

The invention relates to mechanical engineering and can be used in repair production.

There are various ways of connecting cylindrical parts:

- rigid mechanical connection, for example keyed;

- friction joint, for example, press fit;

- connection on contacting surfaces, for example, by welding or gluing (see Anuryev V.I. Handbook of a mechanical engineer. M .: Mechanical Engineering, 1982).

The first two methods do not exclude the occurrence of fretting corrosion of the contact surfaces of the joint, their wear as a result of micromotion and, as a result, impaired operability of the joints. The third method eliminates the possibility of micro-movements of the contact surfaces, and consequently, wear from fretting corrosion, but makes it difficult to disassemble the connection during repair work.

In addition, all methods are poorly suited for repairing worn joints, as in this case, it is necessary to restore the original dimensions of the parts and ensure their alignment during assembly.

The closest technical solution is the "Method of restoring worn parts" (see. Copyright certificate No. SU 1791090 A1 from 07.23.90; MKI V 23 P 6/00. BI No. 4 from 01.30.93).

In this case, it is proposed to install between the mating parts an additional thin-walled split sleeve. To protect the connection from wear due to fretting corrosion, the sleeve is coated with an antifriction coating.

The method allows to simplify the repair work.

The disadvantage of this design is the ability to crank the connected parts relative to each other with insufficient tightness, which is difficult to ensure under conditions of repair production. Excessive interference may impair the functionality of the assembly, such as jamming a rolling bearing.

The invention solves the problem of reducing the effect of fretting corrosion on the durability of the shaft-hole joint, eliminating the rotation of the mating parts and the possibility of easy disassembly of the joint.

This is achieved by the fact that in the fixed connection of cylindrical parts containing a thin-walled sleeve with an antifriction coating installed between the mating parts, according to the invention, the sleeve is made of inserts. The liners have an antifriction coating on one side, and glue on the other. In this case, one part of the liners is glued to the shaft, and the other is glued to the surface of the hole. As a result, a joint is formed that prevents turning parts, eliminates fretting corrosion damage, but makes it easy to dismantle it.

The invention is illustrated in the drawing, where 1 is a shaft, 2 is a sleeve, 3 is an insert, 4 is an anti-friction coating, 5 is an adhesive layer. An example of the implementation of the proposed connection using four inserts. To restore the worn connection "shaft-bearing roller" of the gearbox of the drive generator of the passenger carriage, the supporting journal of the shaft must be pierced. In this case, the neck diameter was reduced by a double thickness of the tape used for the manufacture of inserts (1 mm).

An antifriction coating is applied to the inner surface of one liner, and a layer of anaerobic adhesive is applied to the outer surface. On the second insert, on the contrary, a layer of anaerobic adhesive is applied to the inner surface, and an antifriction coating (for example, fluoroplastic) is applied to the outer surface.

The rolling bearing together with the bushings is mounted on the shaft in a sliding fit.

Such a unit was tested for 1 year under operational conditions. In parallel, connections made without the proposed bushings were tested.

It was established that in the first case no damage occurred in the shaft-bearing joint, in the second case the surface of the shaft and bearing were subject to fretting corrosion.

Claims (1)

A fixed connection of cylindrical parts containing a shaft and a part with a hole between which a thin-walled sleeve with an antifriction coating is installed, characterized in that the thin-walled sleeve is made in the form of several liners, some of which are glued to the shaft, and others to the surface of the part with a hole, the surface of each liner, opposite the glued, is made with an anti-friction coating applied to it.