SU1702002A1 - Support - Google Patents

Abstract

The invention relates to mechanical engineering, namely, to supports in which the shaft rests on several bearings. The aim of the invention is to increase the reliability of the support by uniformly distributing between the bearings both axial and radial loads and by limiting the amplitudes of oscillations of the shaft supports. The support is a housing on which the shaft rests through bearings sequentially mounted on it. Elastic hollow elements are installed between the bearing ends of the bearings and the housing, as well as between the outer surfaces of the outer rings of the bearings and the housing. The elastic elements communicate with each other and are connected to a pressure source through high and low pressure receivers, which are connected to the cavities of the elastic elements depending on the speed of rotation of the shaft. This reduces the amplitude of oscillations of the support and its dynamic loading, increasing reliability, 3 sludge. yo

Description

The invention relates to mechanical engineering, in particular to bearings in which the shaft rests on several bearings.

The purpose of the invention is to increase reliability and enhance functionality.

Figure 1 shows the proposed support; figure 2 - amplitude-frequency characteristic; on fig.Z - strength characteristics of the support.

The support consists of a corus 1. rolling bearings 2, successively located on the shaft 3. hollow elastic elements 4, located between the outer race of bearings 2 and the housing 1. The system for equalizing the loads on the bearing bearings contains a pressure source 5, a high pressure receiver 6 and a low pressure receiver 7 which are equipped with controllable valves connected

to the sensor 8 of the speed of rotation of the shaft 3. The cavities of the elastic elements 4 are interconnected and through control valves with receivers, which in turn are connected to a pressure source 5.

The support works as follows.

In the receiver 7, a low pressure is maintained, which is 10 to 15 times less than the high pressure in the receiver 6.

The load from the rotating shaft through the bearings 2 and the elastic elements 4 is transferred to the support body 1 located on a fixed base.

The high pressure receiver is connected to the cavities of the elastic elements at a speed

VI

ABOUT

u o o o

Yu

ftXuJo

where tuo is the natural frequency of the system when a high pressure receiver is connected to the cavities of the elastic elements of the receiver;

k is the ratio of the pressure in the low pressure receiver to the pressure in the high pressure receiver,

At the speed of the above, the high pressure receiver shuts down and the low pressure receiver is connected.

When connecting any of the receivers to the cavities of the elastic elements 4, there is a uniform distribution of both axial and radial loads between the bearings, since the elastic elements are of the same type, their cavities are interconnected and connected to one of the receivers, i.e. pressure in all elastic elements is the same, therefore, the same load on each bearing.

A decrease in the dynamic load of the support is illustrated in the amplitude-frequency (Fig. 2) and force (Fig. 3) characteristics, from which it can be seen that when the shaft accelerates as its angular rotation speed CD increases, the centrifugal force and the oscillation amplitude of the supports increase.

This mode of operation is reflected by the OS branch of the amplitude-frequency characteristic (figure 2). When the shaft reaches speed

a i) o

The supply of the cavities of the elastic elements is switched from the high-pressure receiver to the low-pressure receiver.

With a further increase in the angular velocity of rotation, the amplitudes of the oscillations of the supports asympatically decrease in accordance with the DM section.

In the braking mode, i.e. as u decreases, the amplitude of oscillations of the shaft supports increases in accordance with the section of the DW. Before switching from a low pressure receiver to a high pressure receiver, what will happen at a speed of

and then a further decrease in the speed and amplitude of oscillations of the supports takes place in accordance with the section CO.

Thus, as a result of switching receivers in the modes of acceleration and deceleration of the shaft, the amplitude of oscillations of the supports is limited by point C in the amplitude-frequency characteristic (Fig. 2).

The limitation of the amplitudes of the oscillations of the supports contributes to the reduction of dynamic loading, and consequently, to an increase in the reliability of the support.

Claims (1)

The invention of the support, comprising a housing, bearings mounted in series on the shaft rolling, a load balancing system between them, comprising a pressure source, a feedback line and interconnected chambers, characterized in that, in order to improve reliability, the chambers are made in the form of elastic hollow elements placed between the bearing end surfaces of the bearings and the housing and the outer cylindrical surfaces of the outer rings of the bearings and the housing, and the load balancing system between the bearings is equipped with high and low pressure receivers connected to a pressure source and also with the feedback line. / Ґ "." with FIG. 2 when O y-VWt "Kg 3