DE102014211710A1 - Drill motor bearing assembly - Google Patents

Drill motor bearing assembly Download PDF

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Publication number
DE102014211710A1
DE102014211710A1 DE102014211710.0A DE102014211710A DE102014211710A1 DE 102014211710 A1 DE102014211710 A1 DE 102014211710A1 DE 102014211710 A DE102014211710 A DE 102014211710A DE 102014211710 A1 DE102014211710 A1 DE 102014211710A1
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Prior art keywords
bearing
bearing ring
ring
drill motor
rings
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Ceased
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DE102014211710.0A
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German (de)
Inventor
Erich Klinglmair
Roland Muttenthaler
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SKF AB
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SKF AB
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Priority to DE102014211710.0A priority Critical patent/DE102014211710A1/en
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Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/10—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/02—Mechanical properties
    • F16C2202/04—Hardness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • F16C2204/70—Ferrous alloys, e.g. steel alloys with chromium as the next major constituent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/40—Application independent of particular apparatuses related to environment, i.e. operating conditions
    • F16C2300/42—Application independent of particular apparatuses related to environment, i.e. operating conditions corrosive, i.e. with aggressive media or harsh conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2352/00—Apparatus for drilling

Abstract

Die Erfindung betrifft eine Bohrmotor-Lageranordnung zur Lagerung eines sich drehenden Bauteils, wobei die Lageranordnung mindestens ein Lager (1) umfasst, das mindestens einen ersten Lagerring (2) und mindestens einen zweiten Lagerring (3) aufweist. Um in kostengünstiger Weise eine hohe Gebrauchsdauer der Lagerringe zu erreichen, sieht die Erfindung vor, dass der erste Lagerring (2) und/oder der zweite Lagerring (3) aus einem Stahlwerkstoff besteht, der einen Chromanteil von mindestens 10 % aufweist.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

Die Erfindung betrifft eine Bohrmotor-Lageranordnung zur Lagerung eines sich drehenden Bauteils, wobei die Lageranordnung mindestens ein Lager umfasst, das mindestens einen ersten Lagerring und mindestens einen zweiten Lagerring aufweist.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.

Die vorliegende Erfindung betrifft dabei Lagerstellen für Bohrmotoren, die hautsächlich Axiallasten, aber auch Radiallasten aufnehmen können bzw. müssen, wobei eine besonders korrosionsbeständige Ausgestaltung angestrebt wird.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.

Bohrmotoren der gattungsgemäßen Art sind Bestandteil von Bohranlagen, mit denen Bohrungen in das Erdreich eingebracht werden, wofür sich drehende Komponenten benötigt werden. Der Rotor des Bohrmotors muss dementsprechend drehbar gelagert sein. Die benötigte Lagerung ist dabei einer besonders hohen aggressiven und abrasiven Belastung ausgesetzt, weil zumeist Bohrschlamm unter anderem zur Kühlung und Schmierung der Lagerstelle eingesetzt wird. Weiterhin werden die Lagerringe der Lagerung hohen Lasten, insbesondere Stoßbelastungen, ausgesetzt.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.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Bohrmotor-Lageranordnung so fortzubilden, dass eine längere Lebensdauer der Lagerung als bislang erreicht werden kann. Ferner soll die Zuverlässigkeit der Lageranordnung erhöht werden. Schließlich wird angestrebt, eine Reduzierung von Wartungsarbeiten und Produktionsausfällen zu erreichen und somit entsprechende Kostenreduzierungen zu ermöglichen.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.

Die Lösung dieser Aufgabe durch die Erfindung ist dadurch gekennzeichnet, dass der erste Lagerring und/oder der zweite Lagerring aus einem Stahlwerkstoff besteht, der einen Chromanteil von mindestens 10 % aufweist.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%.

Die Erfindung stellt demgemäß auf den Einsatz eines speziellen Stahls ab, der insbesondere bei der Beaufschlagung mit Bohrschlamm eine erhöhte Resistenz zeigt. Somit wird eine hohe Korrosionsbeständigkeit erreicht, die bei den in Rede stehenden Bohrmotor-Lageranordnungen bislang nicht bekannt war.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.

Der erste Lagerring und/oder der zweite Lagerring weisen dabei bevorzugt eine Oberflächenhärte von mindestens 52 HRC auf.The first bearing ring and / or the second bearing ring preferably have a surface hardness of at least 52 HRC.

Das Material des ersten Lagerrings und/oder des zweiten Lagerrings ist vorteilhafter Weise martensitisch härtbar.The material of the first bearing ring and / or the second bearing ring is advantageously martensitic curable.

Das Material des ersten Lagerrings und/oder des zweiten Lagerrings kann weiterhin weitere Materialbestandteile aufweisen, so dass die Lagerringe korrosionsbeständig sind.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.

Der erste Lagerring und der zweite Lagerring können als zusammenwirkende Gleitlagerelemente ausgebildet sein. Es ist aber auch möglich, dass zwischen dem ersten Lagerring und dem zweiten Lagerring Wälzkörper angeordnet sind, d. h. in diesem Falle ist eine Ausgestaltung als Wälzlager vorgesehen. Ein Einsatz für Gleitlager ist allerdings auch denkbar, wenngleich nicht der bevorzugte Anwendungsfall.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.

Die vorgeschlagene Lösung stellt somit korrosionsbeständige Lagerringe, insbesondere Wälzlagerringe, zur Verfügung, die sich besonders für Öl- und Gasbohranwendungen eignen. The proposed solution thus provides corrosion-resistant bearing rings, in particular rolling bearing rings, which are particularly suitable for oil and gas drilling applications.

Die Gebrauchsdauer der Lagerringe, insbesondere der Wälzlagerringe, kann somit erhöht werden. In vorteilhafter Weise wird der Verschleiß der Lagerringe vermindert; insbesondere tritt Grübchenbildung (Pitting) später als bislang auf oder gegebenenfalls auch gar nicht mehr.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.

Zentraler Aspekt der vorgeschlagenen Verbesserung ist ein korrosionsbeständiger Lagerringwerkstoff, der einen Chromgehalt von mindestens 10 Gew.-% aufweist. The central aspect of the proposed improvement is a corrosion resistant bearing ring material having a chromium content of at least 10% by weight.

Der bevorzugt martensitisch härtbare rostfreie Stahl hat bevorzugt eine Mindesthärte von 52 HRC. Das Material des Lagerrings zeichnet sich durch eine hohe Stahlreinheit und Homogenität aus.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 der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die einzige Figur zeigt den Radialschnitt durch ein Kugellager, das Bestandteil einer Bohrmotor-Lageranordnung ist. 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 der Figur ist ein Lager 1 in Form eines Wälzlagers zu sehen, das Bestandteil eines Bohrmotors ist. Mit der dargestellten Lagerung kann insbesondere der Rotor des Bohrmotors in einem Gehäuse gelagert werden. Der Bohrmotor ist dabei Bestandteil einer Bohranordnung, mit der Bohrungen in das Erdreich eingebracht werden können. 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.

Hierfür weist die Bohrmotor-Lageranordnung Lager 1 auf, wie sie skizziert sind. Im Ausführungsbeispiel sind zwei Lagerinnenringe 2 axial benachbart angeordnet, genauso wie zwei Lageraußenringe 3. Zwischen den Lagerringen 2, 3 sind Wälzkörper 4 in Form von Kugel angeordnet. 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.

Wesentlich ist, dass sowohl für die Lagerinnenringe 2 als auch für die Lageraußenringe 3 ein Stahlwerkstoff verwendet wird, der einen Chromanteil von mindestens 10 % aufweist. 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%.

Mit dieser Ausgestaltung ist die Voraussetzung dafür geschaffen, die Lagerringe so korrosionsbeständig zu machen, dass sie von Bohrschlamm durchflossen werden können, ohne Schaden zu nehmen. 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.

Es können auch höherer Chromanteile vorgesehen werden, beispielsweise 12 Gew.-% oder 14 Gew.-%.It is also possible to provide higher amounts of chromium, for example 12% by weight or 14% by weight.

Das so hergestellte Lager zeichnet sich durch eine höhere Gebrauchsdauer aus, als es mit herkömmlichem Wälzlagerstahl der Fall wäre. The bearing thus produced is characterized by a longer service life than would be the case with conventional bearing steel.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Lager (Wälzlager) Bearings (rolling bearings)
22
erster Lagerring (Innenring) first bearing ring (inner ring)
33
zweiter Lagerring (Außenring) second bearing ring (outer ring)
44
Wälzkörper  rolling elements

Claims (6)

Bohrmotor-Lageranordnung zur Lagerung eines sich drehenden Bauteils, wobei die Lageranordnung mindestens ein Lager (1) umfasst, das mindestens einen ersten Lagerring (2) und mindestens einen zweiten Lagerring (3) aufweist, dadurch gekennzeichnet, dass der erste Lagerring (2) und/oder der zweite Lagerring (3) aus einem Stahlwerkstoff besteht, der einen Chromanteil von mindestens 10 % aufweist.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%. Bohrmotor-Lageranordnung nach Anspruch 1, dadurch gekennzeichnet, dass der erste Lagerring (2) und/oder der zweite Lagerring (3) eine Oberflächenhärte von mindestens 52 HRC aufweist.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. Bohrmotor-Lageranordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Material des ersten Lagerrings (2) und/oder des zweiten Lagerrings (3) martensitisch härtbar ist.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. Bohrmotor-Lageranordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Material des ersten Lagerrings (2) und/oder des zweiten Lagerrings (3) weitere Materialbestandteile aufweist, so dass die Lagerringe (2, 3) nichtrostend sind. 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. Bohrmotor-Lageranordnung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der erste Lagerring (2) und der zweite Lagerring (3) als zusammenwirkende Gleitlagerelemente ausgebildet sind.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. Bohrmotor-Lageranordnung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass zwischen dem ersten Lagerring (2) und dem zweiten Lagerring (3) Wälzkörper (4) angeordnet sind.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.
DE102014211710.0A 2014-06-18 2014-06-18 Drill motor bearing assembly Ceased DE102014211710A1 (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049809B (en) * 1959-02-05 Issy-les-Moulineaux Seine und Roger Francois Rouviere Aureilhan Hautes-Pyrenees Wladimir Tiraspolsky (Frankreich) Deep drilling motor, in particular drilling turbine with an axial compensating thrust bearing
DE3433360A1 (en) * 1983-10-26 1985-05-09 Dresser Industries, Inc., Dallas, Tex. THROTTLE SYSTEM FOR LIQUID FLOW IN A LOWERING MOTOR
DE4113986A1 (en) * 1991-04-29 1992-11-12 Preussag Erdoel Und Erdgas Gmb HYDRAULIC DRILLING MOTOR FOR DEEP DRILLING
DE19654545A1 (en) * 1995-12-29 1997-07-03 Minebea Kk Friction-free bearing
DE102005004184A1 (en) * 2004-08-31 2006-03-02 Ina-Schaeffler Kg Bearing unit, e.g. for downward drilling motors, has bearing holders with conical running tracks and axes of symmetry that are inclined with respect to main axis of at least one inner ring and/or first outer ring
DE102008021963A1 (en) * 2008-05-02 2009-11-05 Schaeffler Kg Roller bearing useful in corrosive and/or lubricant-free environment, comprises a bearing component such as a bearing ring, a sleeve or a bush with a rolling body bearing surface and/or a rolling body moving on the bearing surface
US8016052B2 (en) * 2005-06-09 2011-09-13 Ceradyne, Inc. Thrust bearing assembly
DE102010050600A1 (en) * 2010-11-05 2012-05-10 Schaeffler Technologies Gmbh & Co. Kg Race ring for forming radially and axially loadable large bearing in arbor, has two segments which are firmly interconnected along circumferential direction
US20140037232A1 (en) * 2012-08-03 2014-02-06 National Oilwell Varco, L.P. Mud-Lubricated Bearing Assembly with Mechanical Seal

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1049809B (en) * 1959-02-05 Issy-les-Moulineaux Seine und Roger Francois Rouviere Aureilhan Hautes-Pyrenees Wladimir Tiraspolsky (Frankreich) Deep drilling motor, in particular drilling turbine with an axial compensating thrust bearing
DE3433360A1 (en) * 1983-10-26 1985-05-09 Dresser Industries, Inc., Dallas, Tex. THROTTLE SYSTEM FOR LIQUID FLOW IN A LOWERING MOTOR
DE4113986A1 (en) * 1991-04-29 1992-11-12 Preussag Erdoel Und Erdgas Gmb HYDRAULIC DRILLING MOTOR FOR DEEP DRILLING
DE19654545A1 (en) * 1995-12-29 1997-07-03 Minebea Kk Friction-free bearing
DE102005004184A1 (en) * 2004-08-31 2006-03-02 Ina-Schaeffler Kg Bearing unit, e.g. for downward drilling motors, has bearing holders with conical running tracks and axes of symmetry that are inclined with respect to main axis of at least one inner ring and/or first outer ring
US8016052B2 (en) * 2005-06-09 2011-09-13 Ceradyne, Inc. Thrust bearing assembly
DE102008021963A1 (en) * 2008-05-02 2009-11-05 Schaeffler Kg Roller bearing useful in corrosive and/or lubricant-free environment, comprises a bearing component such as a bearing ring, a sleeve or a bush with a rolling body bearing surface and/or a rolling body moving on the bearing surface
DE102010050600A1 (en) * 2010-11-05 2012-05-10 Schaeffler Technologies Gmbh & Co. Kg Race ring for forming radially and axially loadable large bearing in arbor, has two segments which are firmly interconnected along circumferential direction
US20140037232A1 (en) * 2012-08-03 2014-02-06 National Oilwell Varco, L.P. Mud-Lubricated Bearing Assembly with Mechanical Seal

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