DE3337749A1 - Axial thrust bearing - Google Patents

Abstract

The invention describes an axial thrust bearing, in particular for underwater operation, which comprises a supporting body bearing a sliding surface and segments which slide on the sliding surface of the supporting body and are held tiltably in a carrier body. To allow large forces to be accepted by a bearing of relatively small dimensions, the sliding surfaces of the supporting body and of the segments are composed of silicon carbide.

Description

Designation: thrust bearing

The invention relates to a thrust bearing, in particular for underwater operation, consisting of a support body carrying a sliding surface and on the sliding surface of the support body sliding segments in a Carrier bodies are held tiltable.

In such known thrust bearings, there is the sliding surface the support body made of carbon, bronze, plastic or the like., While the segments a Have sliding surface made of steel or carbon. These known thrust bearings have on the one hand a very large design and also run on very small ones Overloads hot, which usually leads to damage to the sliding surfaces and makes it necessary to replace the thrust bearing.

The object of the invention is therefore to provide a thrust bearing of the type mentioned in such a way that small dimensions large Bearing forces can be absorbed.

This object is achieved in that the sliding surfaces of the support body and the segments are made of silicon carbide.

The sliding surface of the support body is advantageously an annular one Disc made of silicon carbide, which with an epoxy resin or the like. on the support body is attached.

The sliding surfaces of the segments are preferably in the shape of a circular ring segment Silicon carbide plates with an epoxy resin or the like. attached to the segments are.

The support body, the carrier body and / or the segments are preferably made made of steel or sintered metal.

The thickness of the annular disk made of silicon carbide is advantageous about twice as large as the thickness of the circular ring segment-shaped plates.

In a preferred embodiment, the circular ring-shaped Disks made of silicon carbide and / or the circular segment-shaped plates on their the support body or the segments associated rear side recesses into which Extensions or the like. engage the support body or the segments.

The invention is illustrated by way of example in the drawings.

1 shows an axial thrust bearing according to the invention in longitudinal section, FIG. 2 shows the axial thrust bearing in cross section according to II-II of FIG. 1, FIG. 3 shows a support body with a circular sliding surface in longitudinal section, FIG. 4 shows the support body according to FIG. 3 in plan view, FIG. 5 a segment of an axial thrust bearing in longitudinal section, and FIG Fig. 6 the segment of the axial thrust bearing according to FIG. 5 in plan view.

According to FIGS. 1 to 6, there is a thrust bearing for underwater operation from a support body 1, in which three segments 2 are held tiltable. How in particular Figures 1, 5 and 6 show the segments 2 have a web 3 with a recess 4, protrude into the pins 5 of the support body 1 and so the segments 2 in relation to support body 1 tiltable.

As FIGS. 2, 5 and 6 show, the segments 2 are in the shape of a circular ring segment and also carry plates 6 which are configured in the shape of a circular ring segment made of silicon carbide, which are attached to the segments with an epoxy resin 7.

A support body 8 slides with his on the plates 6 of the segments 2 circular disc 9 made of silicon carbide, which is also made with an epoxy resin 10 is attached to the support body 8.

As FIGS. 3 and 4 show, the circular disc 9 recesses 11, in the extensions 12 of the support body protrude, so that the annular disk 9 made of silicon carbide is secured against rotation is.

As Figures 1 and 5 show, the thickness is circular Disc 9 is about twice as large as the thickness of the circular segment-shaped plate 6 on segments 2.

Through the formation of the sliding surfaces of the support body and the segments a significant reduction in the sliding surface can be achieved from silicon carbide, so that the diameter of the annular disc 9 is reduced very much and the area of the plate 6 of the segments 2 is correspondingly greatly reduced. The sliding surfaces made of silicon carbide, which are only subject to little bending stress, are secured against bending by the support body 1 and the support body 8. The thrust bearing according to the invention behaves particularly advantageously when it starts up, since only low tearing forces are necessary. There is also a running-in of the thrust bearing (Mating run) not necessary.

When using the thrust bearing according to the invention in an underwater pump usually occurs after switching off the pump due to the lowering of the water column a slow reverse rotation of the pump wheel in the riser pipe, whereby because of the lack damage to the sliding surfaces occurs due to the lubricating film of water. The inventive The thrust bearing is not damaged when rotating backwards, even if the lubricating film is absent.

Hydraulic shocks also result from the actuation of slides and valves or by the disappearance of cavitation bubbles on the pump wheels and thus transferred to the axial bearing, does not damage the bearing.

Claims (6)

Claims: 1. Axial thrust bearings, especially for underwater operation, consisting of a support body carrying a sliding surface and on the sliding surface of the support body sliding segments, which are held tiltably in a support body are, characterized in that the sliding surfaces (6, 9) of the support body (8) and the segments (2) consist of silicon carbide. 2. Axial thrust bearing according to claim 1, characterized in that the The sliding surface of the support body (8) is an annular disc (6) made of silicon carbide is that with an epoxy resin or the like. is attached to the support body. 3. Axial thrust bearing according to one of claims 1 or 2, characterized in that that the sliding surfaces of the segments (2) circular ring segment-shaped plates (6) made of silicon carbide are that with an epoxy resin or the like. are attached to the segments. 4. Axial thrust bearing according to one of claims 1 or 3, there- by characterized in that the support body (8), the carrier body (1) and / or the segments (2) are made of steel or sintered metal. 5. Axial thrust bearing according to one of claims 1 to 4, characterized in that that the thickness of the annular disc (9) made of silicon carbide is about twice is as great as the thickness of the circular ring segment-shaped plates (6). 6. Axial thrust bearing according to one of claims 1 to 4, characterized in that that the annular disks (9) made of silicon carbide and / or the annular segment-shaped Plates (6) on their rear side associated with the support body (8) or the segments (2) Have recesses (11) into the extensions (12) of the support body (8) or the Engage segments (2).