RU2319048C1 - Combination support - Google Patents

Abstract

FIELD: mechanical engineering; rotary machines.

SUBSTANCE: invention relates to rotary machines to which higher requirements as to speed and possibility of multiple startings (stoppings) are imposed. Proposed combination support contains housing accommodating antifriction bearing and multiwedge hydraulic sliding bearing support surfaces of which are resilient lobes on inner surface of shaft and outer race of antifriction bearing. Antifriction bushing installed in housing forms smooth hydrodynamic sliding bearing with outer surface of shaft.

EFFECT: increased service life and improved reliability of "rotor-supports" system by separating and doubling of functions of antifriction and sliding bearings.

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Description

The invention relates to the field of mechanical engineering and can be used in rotary machines, which are subject to increased requirements for speed and the possibility of multiple starts (stops) of the machine.

Known combined support [1], which is the closest in technical essence to the present invention, comprising a housing and a sliding bearing disposed therein, a rolling bearing and elastic metal plates fixed to the inner surface of the hollow shaft and forming wedge gaps with the outer ring of the rolling bearing. In such a support, in the normal mode, one sliding bearing works, and in the start-stop modes, the rolling bearing takes up the load.

The disadvantage of this support is that in certain modes, increased vibration loads can occur, and the load capacity of a multi-wedge hydrodynamic sliding bearing may be insufficient. This can lead to shock interactions of the outer ring of the rolling bearing and the elastic elements, resulting in increased wear and possibly complete tearing.

The problem to which the invention is directed is to increase the resource and reliability of the rotor-support system by separating and duplicating the functions of rolling and sliding bearings.

The problem is achieved in that in the combined support containing the housing and placed in it a rolling bearing and multi-V-hydrodynamic sliding bearing, in which the supporting surfaces are elastic petals on the inner surface of the shaft and the outer ring of the rolling bearing, in contrast to the prototype, the antifriction sleeve is installed in the housing forming a smooth hydrodynamic plain bearing with the outer surface of the shaft.

The invention is illustrated by the drawing, which shows a combined support.

The combined support consists of a housing 1 in which a rolling bearing 2, a shaft 3 and elastic metal plates 4 and an antifriction sleeve 5 located therein are mounted.

The device operates as follows: when the machine starts, the shaft 3 is rotated and the load is transferred to the housing 1 through the rolling bearing 2. The shaft engages with the outer ring of the rolling bearing due to the adhesion forces between the elastic metal plates 4 and the outer ring of the rolling bearing. When the shaft rotational speed increases under the action of centrifugal forces, the elastic metal plates bend, thereby forming one of the surfaces of the sliding bearing on the inner surface of the shaft with an axial supply of lubricant. Further, the lubricant enters the gap between the outer surface of the shaft and the antifriction sleeve 5 and, thereby, the outer surface of the shaft and the antifriction sleeve form a smooth hydrodynamic sliding bearing. The rolling bearing is switched off from operation, its outer ring rotates under the action of the friction moment of the multi-wedge hydrodynamic sliding bearing, and the load is transferred to the housing and the shaft is maintained in space through the lubricating layers of the multi-wedge and smooth hydrodynamic bearings. Under shock loads and unstable operation, the susceptibility of the support to damage is reduced due to the additional reaction of a smooth hydrodynamic plain bearing.

This invention allows to increase the load bearing capacity of the node with constant dimensions and to improve the reliability of the support node due to the separation and duplication of the functions of the rolling bearing and sliding bearing.

Information sources

1. Combined support. The copyright certificate of the Russian Federation No. 2228470, published May 10, 2004 (Prototype).

Claims (1)

Combined support comprising a housing and a rolling bearing and a multi-groove hydrodynamic sliding bearing, in which the supporting surfaces are elastic petals on the inner surface of the shaft and the outer ring of the rolling bearing, characterized in that an antifriction sleeve is installed in the housing, forming a smooth with the outer surface of the shaft hydrodynamic plain bearing.