DE102014211710A1 - Drill motor bearing assembly - Google Patents

Abstract

The invention relates to a drill motor bearing arrangement for supporting a rotating component, wherein the bearing arrangement comprises at least one bearing (1) which has at least one first bearing ring (2) and at least one second bearing ring (3). In order to achieve a high service life of the bearing rings in a cost effective manner, the invention provides that the first bearing ring (2) and / or the second bearing ring (3) consists of a steel material having a chromium content of at least 10%.

Description

The invention relates to a drill motor bearing arrangement for supporting a rotating component, wherein the bearing arrangement comprises at least one bearing which has at least one first bearing ring and at least one second bearing ring.

The present invention relates to bearing points for drilling motors, which can or must absorb axial load, but also radial loads mainly, with a particularly corrosion-resistant design is sought.

Drilling motors of the generic type are part of drilling rigs with which holes are introduced into the soil, for which rotating components are needed. The rotor of the drill motor must therefore be rotatably mounted. The required storage is exposed to a particularly high aggressive and abrasive load, because mostly drilling mud is used inter alia for cooling and lubrication of the bearing. Furthermore, the bearing rings of storage are exposed to high loads, in particular shock loads.

The invention has the object of developing a generic drill motor bearing assembly so that a longer life of storage than previously can be achieved. Furthermore, the reliability of the bearing assembly should be increased. Finally, the aim is to achieve a reduction of maintenance and production losses and thus to enable appropriate cost reductions.

The solution of this problem by the invention is characterized in that the first bearing ring and / or the second bearing ring consists of a steel material having a chromium content of at least 10%.

Accordingly, the invention relies on the use of a special steel which exhibits increased resistance, in particular when subjected to drilling mud. Thus, a high corrosion resistance is achieved, which was not previously known in the drill motor bearing arrangements in question.

The first bearing ring and / or the second bearing ring preferably have a surface hardness of at least 52 HRC.

The material of the first bearing ring and / or the second bearing ring is advantageously martensitic curable.

The material of the first bearing ring and / or the second bearing ring may further comprise further material components, so that the bearing rings are corrosion resistant.

The first bearing ring and the second bearing ring may be formed as cooperating sliding bearing elements. But it is also possible that between the first bearing ring and the second bearing ring rolling elements are arranged, d. H. In this case, an embodiment is provided as a rolling bearing. However, an insert for plain bearings is also conceivable, although not the preferred application.

The proposed solution thus provides corrosion-resistant bearing rings, in particular rolling bearing rings, which are particularly suitable for oil and gas drilling applications.

The service life of the bearing rings, in particular the rolling bearing rings, can thus be increased. Advantageously, the wear of the bearing rings is reduced; In particular, pitting occurs later than hitherto, or possibly not at all.

The central aspect of the proposed improvement is a corrosion resistant bearing ring material having a chromium content of at least 10% by weight.

The preferred martensitic hardenable stainless steel preferably has a minimum hardness of 52 HRC. The material of the bearing ring is characterized by a high steel purity and homogeneity.

In the drawing, an embodiment of the invention is shown. The single figure shows the radial section through a ball bearing, which is part of a drill motor bearing assembly.

In the figure is a warehouse 1 in the form of a rolling bearing, which is part of a drilling motor. With the illustrated bearing, in particular, the rotor of the drilling motor can be stored in a housing. The drilling motor is part of a drilling arrangement with which holes can be introduced into the soil.

For this purpose, the drill motor bearing arrangement bearings 1 on how they are sketched. In the embodiment, two bearing inner rings 2 arranged axially adjacent, as well as two bearing outer rings 3 , Between the bearing rings 2 . 3 are rolling elements 4 arranged in the form of a sphere.

It is essential that both for the bearing inner rings 2 as well as for the bearing outer rings 3 a steel material is used which has a chromium content of at least 10%.

With this embodiment, the condition is created to make the bearing rings so corrosion resistant that they can be traversed by drilling mud, without being damaged.

It is also possible to provide higher amounts of chromium, for example 12% by weight or 14% by weight.

The bearing thus produced is characterized by a longer service life than would be the case with conventional bearing steel.

LIST OF REFERENCE NUMBERS

1

 Bearings (rolling bearings)

2

 first bearing ring (inner ring)

3

 second bearing ring (outer ring)

4

 rolling elements

Claims (6)

A bore motor bearing arrangement for mounting a rotating component, wherein the bearing arrangement comprises at least one bearing ( 1 ), the at least one first bearing ring ( 2 ) and at least one second bearing ring ( 3 ), characterized in that the first bearing ring ( 2 ) and / or the second bearing ring ( 3 ) consists of a steel material having a chromium content of at least 10%. Drill motor bearing arrangement according to claim 1, characterized in that the first bearing ring ( 2 ) and / or the second bearing ring ( 3 ) has a surface hardness of at least 52 HRC. Drill motor bearing arrangement according to claim 1 or 2, characterized in that the material of the first bearing ring ( 2 ) and / or the second bearing ring ( 3 ) is martensitic curable. Drill motor bearing arrangement according to one of claims 1 to 3, characterized in that the material of the first bearing ring ( 2 ) and / or the second bearing ring ( 3 ) has further material components, so that the bearing rings ( 2 . 3 ) are stainless. Drill motor bearing arrangement according to one of claims 1 to 4, characterized in that the first bearing ring ( 2 ) and the second bearing ring ( 3 ) are formed as cooperating sliding bearing elements. Drill motor bearing arrangement according to one of claims 1 to 4, characterized in that between the first bearing ring ( 2 ) and the second bearing ring ( 3 ) Rolling elements ( 4 ) are arranged.

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