RU2489615C1 - Combined radial-axial gas-dynamic leaf-type plain bearing - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention can be used as supports of high-speed rotors of machines and units loaded with radial and axial loads, provide when required high carrying capacity at preserving stable position of the rotor in air conditioning systems of aircraft cabins, as well as turbo-supercharge systems in modern car industry and in microgas-turbine electric units. A combined radial-axial gas-dynamic leaf-type plain bearing includes a sleeve enclosing the shaft neck with slots located on its inner surface, into which inserts with leaves are inserted. In order to provide higher carrying capacity at maintaining the rotor stability in the design there provided is cylindrical and conical surfaces of the bearing and the shaft.

EFFECT: improving reliability and increasing durability of a bearing assembly, service life, stable movement and suppression of beating of shafts and rotors.

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Description

The invention relates to turbomachinery and can be used as supports for high-speed rotors of machines and assemblies loaded with radial and axial loads, if necessary, to provide a large bearing capacity while maintaining a stable position of the rotor in air conditioning systems of aircraft cabins, as well as turbocharging systems in modern automotive industry and in microgas turbine power units.

Closest to the claimed invention is a radially thrust gas-dynamic lobe support containing a sleeve covering the shaft journal with grooves located on its inner surface, in which the lugs are inserted (US Patent No. 6505837 dated 01/14/2003, IPC F01D 11/02; F16C 17 / 12: Compliant foil seal. Hooshang Heshmat).

A disadvantage of the known angular contact gas-dynamic support is that at significant radial loads, the shaft contacts the sleeve, resulting in increased wear of the surfaces of the petals, which reduces the durability, reliability and service life of the entire bearing assembly.

The problem to which the invention is directed, is to increase the reliability and durability of the bearing assembly, service life, stability of motion and suppression of beating of shafts and rotors.

This object is achieved in that the radial-axial gas-dynamic lobed plain bearing, comprising a sleeve spanning the shaft pin with grooves located on its inner surface, into which the liners with petals are inserted, unlike the prototype, has a cylindrical and conical parts, which allows for a large bearing capacity while maintaining a stable position of the rotor.

The invention is illustrated by drawings.

Figure 1 is a schematic representation of a combined radial-axial gas-dynamic lobed plain bearing, longitudinal section; figure 2 is a cross section aa in figure 1; figure 3 - bearing housing 1.

The proposed combined radial-axial gas-dynamic flap bearing is a sliding support and consists of a housing 1 in the form of a sleeve with an inner cylindrical and conical surfaces, in the grooves of which are inserted the liners 2, with the petals 3 attached to them, and a shaft 4. The housing 1 covers the liners 2 which are attached to the housing by screws 5, and on the inner surface has longitudinal grooves. The petals 3 are attached to the inserts 2 by spot welding. The lubricant (gas) is drawn into the work area through the gaps between the petals 3 and the shaft 4. The petals 3 inserted into the grooves form a multi-leaf elastic surface and are overlapped. On the outer surface of the petals 3 applied anti-friction coating.

The proposed combined radial-axial gas-dynamic lobed bearing works as follows.

With insignificant radial loads, the main bearing capacity is provided by the cylindrical part of the bearing, however, with an increase in radial load, there is no stability in its operation, which decreases due to the conical part.

With slight axial loads, the bearing capacity is provided by the conical part of the bearing, with an increase in axial load, the shaft shifts towards the bearing housing, as a result of which the thrust bearing, consisting of overlapping lobes, begins to work.

With an increase in the shaft rotation frequency in the lubricating layer of the working clearance of the combined radial-axial lobed plain bearing, excessive gas-dynamic pressure arises. The elastic surface of the petals 3 in this case bends, as a result of which the gap increases. The thickness of the petals is 0.1-0.4 mm, the number of petals is in the range of 3-12.

The proposed combined radial-axial gas-dynamic lobe bearing provides a high level of separation of the bearing surfaces under conditions of significant axial loads. To a certain extent, this design can be considered as a combination of conical and cylindrical gas-dynamic bearings.

The proposed combined radial-axial gas-dynamic lobed plain bearing allows to increase the reliability and durability of the bearing assembly, service life and stability.

Claims (1)

Combined radial-axial gas-dynamic lobed plain bearing, comprising a sleeve spanning a shaft journal with grooves located on its inner surface, into which inserts with petals are inserted, characterized in that the conical and cylindrical parts of the shaft and bearing are provided in the design, which allow maintaining a stable rotor position and provide greater bearing capacity.

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