DE2628918A1 - Hydrodynamic bush bearing with axial oil pockets - has cylindrical end portions to limit axial escape of oil - Google Patents

Abstract

The bearing bush has a bush whose bearing surface has lobe-shaped pockets (4-7) for the hydrodynamic formation of wedges of oil. The pockets extend circumferentially between arcuate portions (10-13) centred on the axis of the bearing. Axially, the recesses extend short of the ends of the bush and terminate at cylindrical end portions or weirs (9). The weirs limit or prevent the escape of oil from the axial ends of the pockets. The weirs may extend over the whole inner circumference of the bush or only at the lower half of the bush.

Description

Xadial plain bearings

The invention relates to a radial plain bearing designed as a multi-wedge bearing for turbo sets, with an axially split over the inner circumference of the bearing surface Bearing shell distributes sickle-shaped pockets in cross section to build up the lubricating oil wedges are admitted, which are connected to oil supply channels.

Such a bearing is known from DU-OS 2 103 239, for example. Although such multi-wedge bearings have a relatively good load-bearing capacity in practice, However, it has been shown that high storage temperatures in certain circumferential areas can occur and that, for example, a rotation of the shaft when the pressure oil is increased only with relatively low loads, but large amounts of oil required without Canting of the bearing could be achieved. A major reason for this is likely it can be seen that the pressure oil supplied via the pockets is too quickly sideways flows off and that the necessary oil wedges are only insufficiently formed as a result.

The invention is therefore based on the object of a radial sliding bearing to create that with lower oil consumption can cope with considerably higher loads is.

Starting from a radial plain bearing of the type mentioned above to solve the problem provided according to the invention that at least the lower half the bearing shell on both end faces of the bearing surface each one cylindrical has formed storage edge.

The radial height of the retaining rims should be measured at least in this way be, that they laterally cover the sickle-shaped pockets and the multi-wedge shells. In addition, it is also possible that the retaining edge extends over the entire circumference the bearing shell extend.

Due to this side dam, a premature outflow of the Bearing oil prevented, so that the bearing has a better load capacity.

A schematic drawing shows the structure and mode of operation an embodiment according to the invention explained in more detail. They show: Fig. 1 is a plan view of the lower half of the bearing shell and FIG. 2 is a longitudinal section by a bearing shell according to the section line 11-11 of FIG. 1.

The bearing shell enclosing a machine shaft at the bearing points 1 consists of a lower half 2 and the upper half 3 and points to their inner bearing surface, for example, four approximately sickle-shaped pockets 4, 5, 6 and 7, which supplies oil supplies, not shown, with bearing oil will. In order to prevent the pressure oil from prematurely escaping from the bearing shell 1 laterally outflows, there are cylindrical retaining edges 8 on both end faces of the bearing surface and 9 are provided, the radial height of which is at least such that the sickle-shaped Pockets 4 to 7 and the multi-wedge shells 10 to 13, d. H. the load-bearing areas the bearing shell between the pockets, are laterally covered.

By attaching the cylindrically shaped retaining edges 8 and 9 and the resulting damming effect against the laterally draining oil kaim - as tests have shown - reached a considerably lower storage temperature will.

Another important advantage is that when the pressure oil is increased the shaft, as it etzunp, for example, when commissioning; is required with Obviously lower amounts of oil can be managed, and in addition the Load against can be increased via bearing shells without retaining rims can. At the same time it has been shown that the power loss is about 30% below the a version without lateral retaining edges.

In the illustrated embodiment is of a four-key bearing been assumed. However, it is also possible to use the bearing design according to the invention also to be provided for any other number of oil wedges, which is also very show good results.

Claims (3)

Claims 1. Radial plain bearings in training as multi-key bearings ftir turbo sets, with an axially split over the inner circumference of the bearing surface Bearing shell distributed in cross section with sickle-shaped pockets for the construction of the lubricating wedges are embedded, which are in connection with oil supply channels, thereby marked, that at least the lower half (2) of the bearing shell (1) on both ends of the Each bearing surface has a cylindrical storage edge (8, 9). 2. Radial plain bearing according to claim 1, characterized in that the retaining rims (8, C)) extend over the entire circumference of the bearing shell (1). 3. Radial plain bearing according to claim 1 or 2, characterized that the radial height of the retaining rims (8, 9) is at least dimensioned so that they the sickle-shaped pockets (4, 5, 6, 7) and the multi-wedge shells (10 to 13) on the side covered.