SU1377671A1 - Wear diagnostics sensor for friction assemblies - Google Patents

Abstract

The invention relates to a ctBM device for diagnosing friction units operating in a gaseous environment. The goal is to increase accuracy by eliminating errors on the size, shape and magnetic properties of wear particles. A permanent magnet 2 is placed inside the cylindrical body 1 of a non-magnetic material. Two inductive coils 3 and 5 electrically connected to an oscillating circuit are mounted on the body. On a permanent magnet 2, wear particles are deposited. The permanent magnet 2 is driven into oscillatory motion and, by changing the frequency of its natural vibrations, determines the mass of adherent wear particles. 3 il.

Description

128

(/)

00

FIG. 2

The invention relates to mechanical engineering and can be used to diagnose friction units, for example friction units of the gas distribution mechanism of internal combustion engines.

The aim of the invention is to increase the accuracy by eliminating errors from the size, shape and magnetic properties of the wear particles.

Fig, 1 shows a sensor installed in the pipeline, a general view; figure 2 - section aa in figure 1; 3 is an electrical circuit of an oscillating circuit.

The sensor contains a cylindrical body 1 of a non-magnetic material, a permanent magnet 2 placed inside it, mounted on the housing 1 of the first inductive coil 3 and electrically connected to it a register 10E1D-1st device 4. The sensor is equipped with a second I1 inductive coil 5 mounted on the housing 1 diametrically opposite the first inductive: coil 3, and an electric oscillating circuit connected to both coils 3 and 5. The electric oscillating circuit consists of a two-stage amplifier-generator (not shown), rectified It (not shown), trigger 6, 7, and power supply (not shown).

The sensor works as follows. When the power source is turned on, an inductive coil 3 flows a current, which causes a permanent magnet 2 to it, which is in the gap between the coils 3 and 5. The magnetic flux changes due to the displacement of the parallel magnet 2 that induces emf in coil 5. This

the induced voltage is applied to the base of the transistor 6, amplified and supplied to the coil 3, increasing the attraction of the permanent magnet 2. When

By decreasing the current in the cat clamp 3, the permanent magnet 2 is moved back by the action of elastic forces. When approaching it to the coil 5 its speed

displacement slows down, and the rate of change of the magnetic flux decreases, decreases and the voltage induced at the base of transistor 6. This causes the forces of electromagnetic attraction to decrease, and the permanent magnet 2 at some instant stops and begins to move to its original position. position. The voltage & to the voltage induced at the input of the amplifier is changed, and the plate enters into oscillatory motion by performing a body feedback in the amplifier and turning it into a generator whose frequency is equal to

the natural frequency of oscillation of the permanent magnet 2.

Claims (1)

Invention Formula A sensor for diagnosing wear of friction units, comprising a cylindrical body of non-magnetic material, a permanent magnet inside it, an inductive coil mounted on the case, and a registering device electrically connected to it, characterized in that it is equipped with a second inductive coil to improve accuracy on the case is diametrically opposed to the first, and an electric oscillating circuit connected to both coils. .i. / 3.5 U /. Fig, 1 at.3 o-sh