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WO1998031947A1 - Roller support - Google Patents

Roller support Download PDF

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Publication number
WO1998031947A1
WO1998031947A1 PCT/DE1998/000101 DE9800101W WO9831947A1 WO 1998031947 A1 WO1998031947 A1 WO 1998031947A1 DE 9800101 W DE9800101 W DE 9800101W WO 9831947 A1 WO9831947 A1 WO 9831947A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnets
storage
osculation
roller
races
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE1998/000101
Other languages
German (de)
French (fr)
Inventor
Heinrich Winter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF GmbH
Original Assignee
SKF GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SKF GmbH filed Critical SKF GmbH
Priority to EP98902959A priority Critical patent/EP0953120A1/en
Publication of WO1998031947A1 publication Critical patent/WO1998031947A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0402—Bearings not otherwise provided for using magnetic or electric supporting means combined with other supporting means, e.g. hybrid bearings with both magnetic and fluid supporting means
    • 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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/0408—Passive magnetic bearings
    • F16C32/0423—Passive magnetic bearings with permanent magnets on both parts repelling each other
    • F16C32/0427—Passive magnetic bearings with permanent magnets on both parts repelling each other for axial load mainly

Definitions

  • DE patent application P 196 086 70 has already proposed using a ball bearing with races made of heat-resistant steel and ceramic balls for the storage of deflection rollers in molten metal.
  • a tub with molten zinc is provided for the galvanizing of a continuous sheet web. This is diverted via a roller arranged in a hot zinc bath at more than 400 degrees Celsius. It is suspended on a frame and rotatably mounted on the shaft ends via the ball bearings mentioned.
  • the aggressive, molten zinc bath flows around practically the entire bearing, since reliable sealing at this temperature and this medium is not possible. This results in unavoidable wear, particularly on the raceways of the steel races.
  • this is achieved by races with only radially loaded raceways, which are reduced in the osculation to the balls, and central ceramic balls arranged in the region of the end faces of the roller journals.
  • This greatly reduces the amount of sliding friction that inevitably occurs in ball bearings with tighter osculation. Although this is paid for by the insufficient axial flow at this point, the axial guidance of ceramic balls in the center of the end face of the roller journals is taken over.
  • the low osculation significantly reduces wear in the sliding friction area of the raceway raceway.
  • the ball bearings can compensate for greater axial play without reaching the area of unauthorized axial loads. This is particularly important in the application mentioned with large dimensions and tolerances of the roll.
  • the ceramic balls are exposed to sliding friction, even if only slightly, so that there is a desire for further optimization.
  • the object of the invention is to improve the storage of the type mentioned in such a way that wear is reduced, in particular in the area of the axial support, in the sense of a longer service life.
  • the supporting elements consist of temperature-resistant permanent magnets, one each being arranged on the end face of the roller journal and the other coaxially on the supporting frame and these repel each other in time.
  • the permanent magnets thus form a contact-free support and are therefore wear-free.
  • the single figure shows the bearing of one end of a roller 1 with a ball bearing low osculation.
  • the roller 1 is mounted on the same side on both sides and is rotatably arranged above it in a support frame 2.
  • the entire arrangement works in a zinc bath, not shown, with the bearings being washed with liquid zinc.
  • the ball bearing shown consists of races 3, 4, made of heat-resistant steel and balls 5 made of ceramic.
  • the inner ring 4 seated on the roller journal 6 and secured with a nut 7 is provided with a cylindrical raceway 8.
  • the outer ring 3 sits in the only indicated support frame 2 and has one opposite Ball radius significantly more curved raceway profile 9. This results in a greatly reduced osculation to the ball 5.
  • the ball bearing is therefore not suitable for axial loads. With this construction, the proportion of sliding friction between balls 5 and the raceway 9 of the outer ring 3 is considerably lower, and that on the inner ring 4 is theoretically zero.
  • the axial support is provided on both sides on each roller pin 6 by a pair of mutually repelling permanent magnets 10. One of them is inserted into a recess 11 on the end face, the other in a corresponding recess 11 on the support frame 2. Between the pole faces 12 left a small gap 13, which allows axial movement of the roller 1. The characteristic of the repulsive force is known to be extremely progressive, so that contact with the pole faces 12 is excluded under normal operating conditions.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Crushing And Grinding (AREA)

Abstract

For the support of deflection rollers(1) in molten metal, ball bearings (3, 4, 5) with low osculation (9) are used in order to compensate temperature-dependent length variations. The thus reduced axial guidance is improved by magnets (10, 19) fitted on the face. For example, mutually repelling permanent magnets (10, 11) are fitted in the turning centre of the shaft (1) and in the opposing frame piece (2).

Description

B e s c h r e i b u n B e s c h r e i b u n

Lagerung von RollenStorage of rolls

Durch die DE-Patentanmeldung P 196 086 70 wurde bereits vorgeschlagen, ein Kugellager mit Laufringen aus hitzebeständigem Stahl und Keramikkugeln für die Lagerung von Umlenkrollen in geschmolzenem Metall zu verwenden. Bei solchen Anwendungsfällen ist beispielsweise ein Bottich mit geschmolzenem Zink für die Verzinkung einer durchlaufenden Blechbahn vorgesehen. Diese wird über eine im mehr als 400 Grad Celsius heißen Zinkbad angeordnete Rolle umgeleitet. Sie ist an einem Gestellrahmen aufgehängt und über die genannten Kugellager an den Wellenenden drehbar gelagert. Das aggressive, geschmolzene Zinkbad umspült praktisch das gesamte Lager, da eine zuverlässige Abdichtung bei dieser Temperatur und diesem Medium nicht möglich ist. Dabei ergibt sich ein nicht zu vermeidender Verschleiß insbesondere an den Laufbahnen der Laufringe aus Stahl. Die Verwendung von Keramikwerkstoffen auch für die Laufringe scheidet meist aus, da mit hohen Kosten und insbesondere mit Zerstörung des stark bruchgefährdeten, spröden Keramikwerkstoffes gerechnet werden muß. Aus diesen Gründen bildet die Konstruktion hitzebeständiger Stahllaufringe und Keramikkugeln noch die optimale Lösung. Jedoch steht bei dieser stets der Wunsch nach einer Verlängerung der Lebensdauer im Vordergrund.DE patent application P 196 086 70 has already proposed using a ball bearing with races made of heat-resistant steel and ceramic balls for the storage of deflection rollers in molten metal. In such applications, for example, a tub with molten zinc is provided for the galvanizing of a continuous sheet web. This is diverted via a roller arranged in a hot zinc bath at more than 400 degrees Celsius. It is suspended on a frame and rotatably mounted on the shaft ends via the ball bearings mentioned. The aggressive, molten zinc bath flows around practically the entire bearing, since reliable sealing at this temperature and this medium is not possible. This results in unavoidable wear, particularly on the raceways of the steel races. The use of ceramic materials for the races is usually out of the question, since high costs and, in particular, destruction of the brittle ceramic material, which is at risk of breakage, must be expected. For these reasons, the construction of heat-resistant steel races and ceramic balls is still the optimal solution. However, the desire for an extension of the service life is always in the foreground.

Dies wird bei der genannten Ausfuhrung durch Laufringe mit ausschließlich radial belasteten, in der Schmiegung zu den Kugeln reduzierten Laufbahnen und zentralen, im Bereich der Stirnflächen der Rollenzapfen angeordneten Keramikkugeln erreicht. Dadurch wird der bei Kugellagern mit engerer Schmiegung zwangsläufig auftretende Gleitreibungsanteil stark reduziert. Dies wird zwar durch die unzureichende Axialflihrung an dieser Stelle erkauft, jedoch wird die axiale Führung von Keramikkugeln im Zentrum der Stirnfläche der Rollenzapfen übernommen. Durch die geringe Schmiegung wird der Verschleiß im Gleitreibungsbereich der Laufbahn des Laufringes erheblich reduziert. Weiterhin können die Kugellager ein größeres axiales Spiel ausgleichen, ohne in den Bereich unerlaubter Axiallasten zu gelangen. Dies ist insbesondere im genannten Anwendungsfall mit großen Abmessungen und Toleranzen der Rolle von Bedeutung. Die Keramikkugeln sind jedoch, wenn auch nur geringfügig, einer Gleitreibung ausgesetzt, sodaß der Wunsch nach weiterer Optimierung besteht.In the embodiment mentioned, this is achieved by races with only radially loaded raceways, which are reduced in the osculation to the balls, and central ceramic balls arranged in the region of the end faces of the roller journals. This greatly reduces the amount of sliding friction that inevitably occurs in ball bearings with tighter osculation. Although this is paid for by the insufficient axial flow at this point, the axial guidance of ceramic balls in the center of the end face of the roller journals is taken over. The low osculation significantly reduces wear in the sliding friction area of the raceway raceway. Furthermore, the ball bearings can compensate for greater axial play without reaching the area of unauthorized axial loads. This is particularly important in the application mentioned with large dimensions and tolerances of the roll. However, the ceramic balls are exposed to sliding friction, even if only slightly, so that there is a desire for further optimization.

Aufgabe der Erfindung ist es, die Lagerung der eingangs genannten Art so zu verbessern, daß im Sinne einer längeren Lebensdauer der Verschleiß insbesondere im Bereich der axialen Abstützung reduziert wird.The object of the invention is to improve the storage of the type mentioned in such a way that wear is reduced, in particular in the area of the axial support, in the sense of a longer service life.

Die Aufgabe wird dadurch gelöst, daß die Abstützelemente aus temperaturfesten Dauermagneten bestehen, wobei jeweils einer an der Stirnfläche des Rollenzapfens und der andere gleichachsig am Tragrahmen angeordnet ist und diese sich gegenzeitig abstoßen.The object is achieved in that the supporting elements consist of temperature-resistant permanent magnets, one each being arranged on the end face of the roller journal and the other coaxially on the supporting frame and these repel each other in time.

Die Dauermagnete bilden somit eine berührungsfreie Abstützung und sind dadurch verschleißfrei.The permanent magnets thus form a contact-free support and are therefore wear-free.

Diese und weitere Merkmale werden nachfolgend an dem in der Zeichnung dargestellten Beispiel beschrieben.These and other features are described below using the example shown in the drawing.

Die einzige Figur zeigt die Lagerung des einen Endes einer Rolle 1 mit einem Kugellager geringer Schmiegung. Die Rolle 1 ist, wie nicht im einzelnen dargestellt, beiderseits gleich gelagert und darüber in einem Tragrahmen 2 drehbar angeordnet. Die gesamte Anordnung arbeitet in einem nicht gezeigten Zinkbad, wobei die Lager mit flüssigem Zink umspült sind.The single figure shows the bearing of one end of a roller 1 with a ball bearing low osculation. As not shown in detail, the roller 1 is mounted on the same side on both sides and is rotatably arranged above it in a support frame 2. The entire arrangement works in a zinc bath, not shown, with the bearings being washed with liquid zinc.

Das dargestellte Kugellager besteht aus Laufringen 3, 4, hergestellt aus hitzebeständigem Stahl und Kugeln 5 aus Keramik. Der auf dem Rollenzapfen 6 sitzende und mit einer Mutter 7 gesicherte Innenring 4 ist mit einer zylindrischen Laufbahn 8 versehen. Der Außenring 3 sitzt in dem nur angedeuteten Tragrahmen 2 und weist ein gegenüber dem Kugelradius erheblich stärker gekrümmtes Laufbahnprofil 9 auf. Dadurch ergibt sich zur Kugel 5 eine stark reduzierte Schmiegung. Das Kugellager ist deshalb für Axialbelastungen nicht geeignet. Durch diese Konstruktion ist der Gleitreibungsanteil zwischen Kugeln 5 und der Laufbahn 9 des Außenringes 3 erheblich geringer, der am Innenring 4 theoretisch Null.The ball bearing shown consists of races 3, 4, made of heat-resistant steel and balls 5 made of ceramic. The inner ring 4 seated on the roller journal 6 and secured with a nut 7 is provided with a cylindrical raceway 8. The outer ring 3 sits in the only indicated support frame 2 and has one opposite Ball radius significantly more curved raceway profile 9. This results in a greatly reduced osculation to the ball 5. The ball bearing is therefore not suitable for axial loads. With this construction, the proportion of sliding friction between balls 5 and the raceway 9 of the outer ring 3 is considerably lower, and that on the inner ring 4 is theoretically zero.

Die axiale Abstützung erfolgt beiderseits an jedem Rollenzapfen 6 durch jeweils ein Paar von sich gegenseitig abstoßenden Dauermagneten 10. Einer davon ist in eine Ausnehmung 1 1 an der Stirnfläche eingesetzt, der andere in eine entsprechenden Ausnehmung 1 1 am Tragrahmen 2. Zwischen den Polflächen 12 ist ein geringer Spalt 13 gelassen, der eine Axialbewegung der Rolle 1 ermöglicht. Die Charakteristik der Abstoßkraft ist bekannter Weise extrem progressiv, so daß eine Berührung der Polflächen 12 unter normalen Betriebsbedingungen ausgeschlossen ist. The axial support is provided on both sides on each roller pin 6 by a pair of mutually repelling permanent magnets 10. One of them is inserted into a recess 11 on the end face, the other in a corresponding recess 11 on the support frame 2. Between the pole faces 12 left a small gap 13, which allows axial movement of the roller 1. The characteristic of the repulsive force is known to be extremely progressive, so that contact with the pole faces 12 is excluded under normal operating conditions.

Claims

S c h u t z a n s p r ü c h eLagerung von Rollen Protection requirements Storage of rolls 1. Lagerung von Rollen in Schmelzmetallbädern mit temperaturfesten Kugellagern, wobei deren Laufringe mit ausschließlich radial belasteten, in der Schmiegung zu den Kugeln reduzierten Laufbahnen und zentralen, im Bereich der Stirnflächen der Rollenzapfen angeordneten, axialen Abstützelementen versehen sind, dadurch gekennzeichnet, daß die Abstützelemente aus temperaturfesten Dauermagneten (10) bestehen, wobei jeweils einer an der Stirnfläche des Rollenzapfens (6) und der andere gleichachsig am Tragrahmen (2) angeordnet ist und diese sich gegenseitig abstoßen.1. Storage of rollers in molten metal baths with temperature-resistant ball bearings, their races are provided with only radially loaded, reduced in the osculation to the balls raceways and central, arranged in the area of the end faces of the roller journal, axial support elements, characterized in that the support elements There are temperature-resistant permanent magnets (10), one each being arranged on the end face of the roller journal (6) and the other coaxially on the support frame (2) and these repel one another. 2. Lagerung nach Anspruch 1, dadurch gekennzeichnet, daß die Dauermagnete (10) scheibenförmig ausgeführt sind.2. Storage according to claim 1, characterized in that the permanent magnets (10) are disc-shaped. 3. Lagerung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dauermagnete (10) ringförmig ausgeführt sind. 3. Storage according to claim 1 or 2, characterized in that the permanent magnets (10) are designed annular.
PCT/DE1998/000101 1997-01-15 1998-01-12 Roller support Ceased WO1998031947A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98902959A EP0953120A1 (en) 1997-01-15 1998-01-12 Roller support

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29700576U DE29700576U1 (en) 1997-01-15 1997-01-15 Storage of rolls
DE29700576.6 1997-01-15

Publications (1)

Publication Number Publication Date
WO1998031947A1 true WO1998031947A1 (en) 1998-07-23

Family

ID=8034559

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/000101 Ceased WO1998031947A1 (en) 1997-01-15 1998-01-12 Roller support

Country Status (3)

Country Link
EP (1) EP0953120A1 (en)
DE (1) DE29700576U1 (en)
WO (1) WO1998031947A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004007984A1 (en) * 2002-07-10 2004-01-22 Turbocor Inc. Device to relieve thrust load in a rotor-bearing system using permanent magnets
DE102005024004A1 (en) * 2005-05-25 2006-12-07 Schaeffler Kg Rotary bearing device, in particular for a rotatable rotary table of a machine tool

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4902360A (en) * 1987-02-04 1990-02-20 Crucible Materials Corporation Permanent magnet alloy for elevated temperature applications
DE4439660A1 (en) * 1993-11-05 1995-07-06 Nsk Ltd Bearing unit for support rolls in hot dip bath
DE19500935A1 (en) * 1994-01-14 1995-07-20 Inst Maschinenelemente Uni Stu Pair of movable components in vehicle gearbox etc.
DE19608670A1 (en) 1996-03-06 1997-09-11 Skf Gmbh Storage of rolls

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4902360A (en) * 1987-02-04 1990-02-20 Crucible Materials Corporation Permanent magnet alloy for elevated temperature applications
DE4439660A1 (en) * 1993-11-05 1995-07-06 Nsk Ltd Bearing unit for support rolls in hot dip bath
DE19500935A1 (en) * 1994-01-14 1995-07-20 Inst Maschinenelemente Uni Stu Pair of movable components in vehicle gearbox etc.
DE19608670A1 (en) 1996-03-06 1997-09-11 Skf Gmbh Storage of rolls

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004007984A1 (en) * 2002-07-10 2004-01-22 Turbocor Inc. Device to relieve thrust load in a rotor-bearing system using permanent magnets
US7800268B2 (en) 2002-07-10 2010-09-21 Danfoss Turbocor Compressors B.V. Device to relieve thrust load in a rotor-bearing system using permanent magnets
US8030814B2 (en) 2002-07-10 2011-10-04 Danfoss Turbocor Compressors B.V. Device to relieve thrust load in a rotor-bearing system using permanent magnets
DE102005024004A1 (en) * 2005-05-25 2006-12-07 Schaeffler Kg Rotary bearing device, in particular for a rotatable rotary table of a machine tool

Also Published As

Publication number Publication date
EP0953120A1 (en) 1999-11-03
DE29700576U1 (en) 1997-02-27

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