DE19529772C1 - Aerostatic low friction bearing - Google Patents

Abstract

The shaft is located via a radial bearing gap and the ring disc via axial bearing gaps in a bearing body. The axial bearing gaps are provided with feed pressure via the radial bearing gap. One of the two axial bearing gaps has a radial outer area, in which the gap width is at least twice as large as in the radial inner area of the smallest radial gap width. At one end of the shaft (1) is fitted a disc, which with the housing (2) forms the first axial bearing gap (7), which at the position (5) of the radial bearing gap (11) is fed with air. The first axial bearing gap at a specific point (6) evolves into the second axial bearing gap (8) which is formed between the shaft disc and the ring (9) of the housing.

Description

In the case of the known static axial gas bearings, everyone who acts in one direction has Axial bearing, its own gas supply. Such thrust bearings are expensive to manufacture and result in extremely high gas consumption. One-sided thrust bearings can by pressure Prestressing also works on two sides.

These bearings are in the publication BARTZ, W., u. a. Luftlagerungen 1993, pp. 122-130. Here, however, pressure is necessary to provide space with throttling, which is not always possible for design reasons.

In the present invention, the gas supply for the first axial bearing gap takes place from Radial bearing gap ago. After gas flows through the first axial bearing gap, the full amount of gas passed into the second thrust bearing gap. Thus the same gas can be added first used in the radial bearing, then in the first axial bearing and additionally in the second axial bearing which means that gas consumption is very low. It is also a cheap her position of gas storage possible.

An embodiment of the gas storage according to the invention is described in more detail below with reference to the drawing ( FIG. 1).

Here, a shaft 1 is mounted aerostatically in a radial and axial direction in a housing 2 . The shaft is driven by a belt at one end 13 and a tool holder 12 is located at the other end. The air reaches the radial bearing gap 11 via the holes 3 and the supply gap 4 .

At one end of the shaft 1 , a disk is attached, which forms the first axial bearing gap 7 with the housing 2 , which is supplied with air at point 5 from the radial bearing gap 11 . The first axial bearing gap merges at point 6 into the second axial bearing gap 8 , which is formed between the disc's shaft 1 and ring 9 of the housing 2 .

The forces of the two thrust bearings act in opposite directions. In order to effect a uniform distribution of forces, the second axial bearing gap 8 is first further and becomes narrower towards the outflow opening 10 again.

Such aerostatic thrust bearings in combination with radial bearings can be used, for example Storage of an off-end spinning rotor can be used because of the low energy consumption and the low manufacturing costs are of great importance.

Claims (1)

Gas-static bearing, consisting of a radial, a double-acting thrust bearing and a shaft on which an annular disc is fastened, in which the shaft is mounted in a bearing body via a radial bearing gap and its annular disc is supported in a bearing body via axial bearing gaps, the axial bearing gaps that merge into one another Radial bearing gap are supplied with the feed pressure, characterized in that one of the two axial bearing gaps has an area radially outside in which the gap width is at least twice as large as in the ra dial inner area of the smallest bearing gap width.