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DE1799530U - DOUBLE ROW BALL WHEEL. - Google Patents

DOUBLE ROW BALL WHEEL.

Info

Publication number
DE1799530U
DE1799530U DEK32705U DEK0032705U DE1799530U DE 1799530 U DE1799530 U DE 1799530U DE K32705 U DEK32705 U DE K32705U DE K0032705 U DEK0032705 U DE K0032705U DE 1799530 U DE1799530 U DE 1799530U
Authority
DE
Germany
Prior art keywords
double row
row ball
ball wheel
balls
row
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.)
Expired
Application number
DEK32705U
Other languages
German (de)
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.)
IHO Holding GmbH and Co KG
Original Assignee
FAG Kugelfischer Georg Schaefer KGaA
Kugelfischer Georg Schaefer and Co
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 FAG Kugelfischer Georg Schaefer KGaA, Kugelfischer Georg Schaefer and Co filed Critical FAG Kugelfischer Georg Schaefer KGaA
Priority to DEK32705U priority Critical patent/DE1799530U/en
Publication of DE1799530U publication Critical patent/DE1799530U/en
Expired 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
    • 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
    • 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
    • F16C19/50—Other types of ball or roller bearings
    • F16C19/505—Other types of ball or roller bearings with the diameter of the rolling elements of one row differing from the diameter of those of another row
    • 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
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-contact bearings
    • F16C43/06—Placing rolling bodies in cages or bearings
    • 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
    • F16C19/18—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 with two or more rows of balls
    • F16C19/181—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 with two or more rows of balls with angular contact
    • F16C19/183—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 with two or more rows of balls with angular contact with two rows at opposite angles
    • 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
    • F16C19/18—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 with two or more rows of balls
    • F16C19/181—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 with two or more rows of balls with angular contact
    • F16C19/183—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 with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—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 with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/70—Diameters; Radii
    • F16C2240/80—Pitch circle diameters [PCD]
    • 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
    • F16C2300/10—Application independent of particular apparatuses related to size
    • F16C2300/14—Large applications, e.g. bearings having an inner diameter exceeding 500 mm
    • 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
    • F16C2350/00—Machines or articles related to building
    • F16C2350/26—Excavators

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Detergent Compositions (AREA)

Description

ZweireihigeKugeldrehkranz DeNeerag beM ss eaf einea &weiregen Kagel- dreb) tranow inebezonaera großen Durcheesserag für beiepielawelso 9C<9Ma. pe Aufsaen voa Baggern, BrekFänea, Baumasehinen aaä e3 ? gi<&b. en se eeiaanr angeordeN. Ka$elyeien TQB we-lßen e e ah emspruchten Reihe einen gSerea » Ueehmosoor als die Xujela der geringer teanaprachten Reihe auf,- weisen. Ss sind eireie SerägkgeHager rni- sei Reibea ih goßy Soa. beaaat, e jedeeh far äi@ safenlose L&ge- 1'W1$ $chwenkbarer Afates s Baggera, Syäaeo Baumaschinen o- der dergleichen schweree ausgeführt sindg als es zur Aufnahme der äußn ãfte notwendig ißt. da die Exzentrizität des Krattan- jgiffes Nie ao eB ist, a. B die höchst belas-teten Kugeln der bei ß IreiN. n-aheN gleie eeh beanspTae werden aad daher eine XelreiM in ite Shiit aii voll a-agenst ist Auch bs bereits eieihige Schrägagellage ss : tasd er.- fechnikt bei denen die hher beanspruchte Xagepeie it gr8Serea Engen als die andereim wesentlichen nar ein Aufkippeti des aer< s gleih umfassende Laufring ziehen diesen in einer zur lagerachse senkrechtes. Ebene geteilt ist M@er Laerbaayt h et a m9 « et en semeid en w haftet 4 Nachtetl an, 4aß 1nfolge d$S steilten Lattfringes weiAalage aä wei <äa. iiepfläehe& sa. eälieh bearbeiten arert aunwt om e, gev trierfehendie beidan Laufringhälften etwas gêgeneinander verßobieben k5nneny was sicb wiederum nachteilig auf die Kraft- vtilan i aser a. aarktt s tam- binzu, daß wegen des ge- teilten Laufringes antweder ßwei Rohlinge zu beschaffen sind ode'F der eFatellng as oinem Rowling dieser Mm die HShe der sowie tm die Breite des ilbotichstahles größei sein mB. » le aufßezeigten Mugel sind durch die Neuerung bei einem zueireibißen Zujeldeobkranz der oingenge geschilderten ß tu Art dadiarch beböbeng daß netzertingsgemäß der die beiden Kugel- egiben Umtasßende ASen-bzw. anenlaufring eineilig aasge- bile ist. a&h die rteuerungsgemãße Ausgestaltung des zwei- yeihigea Kagel&rebRsea ist 19 Hers'&lHmgss. asigkeit ge- eonabor einem zwisehen den beiden tugelreiben in einer zur la- geraebee in oenkrechter Bbene geteilten Laufring bedeutend 8auger, da die beiden aafahaa ia. eiae AsfepaaBg gesehlif- fen werden können. Durch die Ieuernng ist der weitere Vòrteil ba werde urth die kue er ere v Kagel die tut ßiter asefht wrdn Saaen, als es bisher bei ungeteilten laufringen möglioh war. Auch ist die Be- a ; r'be : ituni$ de-a gegenuber einem ge- teilen lantring weniger aufwendig, da bei dem ungeteilten aying awei Asigeflächea. d zwei entrierfläehen an den iinghlften in Wegfall kommen. Weitere Merkmale des aeaeyangsgeäea zweireihigen Km- geldj ? obk, ranzes sind aus der naehetehenden Beoöbxeibung und der beigefgtea ei&nMRß eysiehtlie ia äey swi Asaraagsbei- spiele im Schnitt dargestellt sind. Mh % g eset ? sirelie agel&re : yag alX, % den Ungeteiltegt die beiden KUgelZelbe-a tXMfag$Onden Außen- lagtring l$ dem unge-teilten Innenlau : rring 29 der oboren Zugo-l- r<&e a ep an9e Xagelyeh 4-< iseha ea Tyeg&agela der beiden Kuge3. etNiben 3 und 4 a4nd Trennkazeln vorisesehen. 33i bere gelr @ibe 3 istg da an deser die höhere Bearispra- ehä eitt it gSeyea. KgelR als die unte K\1gelre1he 4 agogezüatet4 lYm die obere laufbabn des 2 mög- 1 : tobot b : reit atigzut-dhreap eind die Zugeln der unteren Kugel- reihe 4 in eine atas 5ßren Kugelmittenkreis als die Kugeln der o'beTEsn 3 Dieat 3 mi ee oetehent i&des Naäs e laa. nlaßg 2'b ae aieh aglgta KaB y oberea gelrea 3 nach oben gegen die obre Lauf bahu dekt 1 Tain gehobe'al, die Kugeln der unteren Xelsihe 4 etagelegt weN gegebenenfalls ah eae &i&h-& eie in die 1. autbahn re : ehende ? Ullnut 59 und der Innenlantring 2ang eie untere Itagelreibe 4 seaenkt wied. Danach laszen siob dle ir, ; xgeln der obezen Zugelreihe 3 in bekannter'Weise durch die aüt Atigenlaafelng 1 a-nd M 2 angebrachten Füllnuten 6und 7 einfuhren, 6 eX n In Fig. ist ea siehge agelrehyaas. mit am Aeggulaufring 89 den ungetelltene die beiden Kugel. reiben m : ta-goenden 9 der oberen 1 o und sntepe Kageyei n dargestellt. Die untere Sugelreihe 11 jäe R-er g3'$j6a*e Blats als de eer ageleie 1o äRsg@ setzt wlrde let mit Sea Küla ausgerastet* r Erhebung 3* Trefijgtt st er XueldPebkranz nach Fg. 2 in der an- teren Kugeleeihe 11 niobt mt Trag-und Trennkugeln, sondern Qg a-TreRFiags 12 bgat. M& oe Kaelpih 10bee aus Fa@-aad rankagla 9i y So&ag &es S. eMehrnaea nach Fig< 2 wird ZnnäOhUt die =tote : Laufi*illo des die beiden ragelreihen =. taseenden Innenlatzfringea 9 mit den Tragkugeln der Kugelreibe 11 eieoebließlioh dens Teennrineen 12 getült und auf die Ka- gelreihe 11 der Außenlfring 8 ageeett. Die Xe$eln der gberon Zugelrethe lo können nun durch die am Außenlaufring a lQal@nlaufring 9 aebae&ten Ill&aten 13 aa 14 eingelegt eyden Bel, dem AusführUngebeispiel ft-Ich Fig. 2 kommt als Vor- teile M-s a8 e r Xglyehe geres&ea Lsa bahnen und die Aflagfläen ar di Tnariae tS ßih dpxoh 2Ulnt% ten un'terbrocheia eind. aVereinfaca r Montage sia$ in bekaaater Weise , der Montage sind In bekannter Weise derAaealafrisg ai Srhganseea 5 ; w ar Äa@en la\1t1ng 8 mit Gewindebohrt1l'1gen 16'und der Innenlantring 2 bs a ndeobNR. geR l ? verea so aa imealanfriR 2 bzw. 9 eine Vergahnnng 18 tft einen 4ntrieb eingoarbeitet. Double row slewing ring DeNeerag beM ss eaf einea & weiregen Kagel- dreb) tranow inebezonaera large diameter ag for beiepielawelso 9C <9Ma. pe Aufsaen voa excavators, BrekFänea, Baumasehinen aaä e3? gi <& b. en se eeiaanr arranged. Ka $ elyeien TQB We had a series of gSerea »Ueehmosoor than the Xujela of the lower teanaprachten row, point. Ss are eireie SerägkgeHager rni- sei Reibea ih great soa. beaaat, e eacheh far äi @ safenlose L & ge 1'W1 $ $ swiveling Afates s Baggera, Syäaeo Baumaschinen o- of the same gravity as it is designed to accommodate the extremely necessary eats. since the eccentricity of the Krattan jgiffes Never ao eB is, a. B the most heavily loaded balls of the ß IreiN. n-aheN the same eeh claims are therefore aad a XelreiM in ite Shiit aii is fully a-agenst Also bs already in a row inclined position ss: tasd er.- technikt in which the more highly stressed Xagepeie it gr8Serea Narrow than the other, essentially a tipping over of the aer s The same comprehensive running ring pulls this to one another bearing axis vertical. Split level is M @ er Laerbaayt h et a m9 «et en semeid en w adheres 4 night pieces, 4ass 1 result of the steep lattfringes weiAalage aä wei <äa. iiepfläehe & sa. edit eälieh arert aunwt om e, gev The two halves of the raceway are slightly opposite one another verßobieben k5nneny which in turn is detrimental to the power vtilan i aser a. aarktt s tam- binzu that because of the split race against two blanks are to be procured ode'F der eFatellng as oinem Rowling this Mm the HShe which and tm the width of the ilbotich steel his mB. »The exposed Mugel are due to the innovation a zueireibißen Zujeldeobkranz the oingenge portrayed ß do Art dadiarch beböbeng that netzertings according to the two spherical egiben Umtasßende ASen or. anenlaufring single-line aas- bile is. a & h the taxation-based design of the two- yeihigea Kagel & rebRsea is 19 Hers'& lHmgss. asness eonabor one between the two drifting in one to the la- straight running ring divided into an upright plane 8auger, because the two aafahaa ia. eiae AsfepaaBg sanded can be opened. The renewal is the further advantage ba will urth die kue er ere v Kagel does as much as saaen than it does was previously possible with undivided races. Also the loading a; r'be: ituni $ de-a opposite a sharing the lantring is less expensive, since the undivided one aying awei Asigeflächa. d two release surfaces on the iinhlften come to omission. Other features of the aeaeyangsgeäea two-row km- moneyj? obk, ranzes are from the attached Beoöbxeibung and the attachedea ei & nMRß eysiehlie ia äey swi Asaraagsbei- games are shown in section. Mh% g eset? sirelie agel & re: yag alX,% den Undivided the two KUgelZelbe-a tXMfag $ on the outside Lagtring l $ the undivided inner liner: rring 29 of the upper Zugo-l- r <& e a ep an9e Xagelyeh 4- <iseha ea Tyeg & agela of the two spheres 3. etNiben 3 and 4 a4nd separating kazeln. 33i bere gelr @ibe 3 istg there on deser the higher bearis- ehä eitt it gSeyea. KgelR as the lower K \ 1gelre1he 4 agogezüatet4 lYm the upper runway of the 2 possible 1: tobot b: riding atigzut-dhreap and the draws of the lower ball Row 4 in an atas 5ßren ball center circle as the balls the o'beTEsn 3 This 3 mi ee oetehent i & des Naäs e laa. nlaßg 2'b ae aieh aglgta KaB y oberea gelrea 3 upwards against the upper barrel bahu dekt 1 tain gehobe'al, the balls of the lower Xelsihe 4 laid down if applicable ah eae & i & h- & eie in the 1st autobahn re: ehende? Ullnut 59 and the inner flange 2 on the lower itag grater 4 sinks again. After that, siob licked dle ir,; xgeln the obezen train row 3 in the known way by the aüt Atigenlaafelng 1 a-nd M 2 attached filling grooves 6 and 7 import, 6 eX n In Fig. Ea is see agelrehyaas. with on Aeggulaufring 89 the unset the two balls. rub m: ta-goenden 9 of the top 1 o and sntepe Kageyei n depicted. The lower row of suction cups 11 jäe R-er g3 '$ j6a * e Blats als de eer ageleie 1o äRsg @ continues, let Sea Küla freaked out the survey 3 * Trefijgtt st he XueldPebkranz according to Fg. 2 in the other teren Kugeleeihe 11 niobt with support and separating balls, but Qg a-TreRFiags 12 bgat. M & oe Kaelpih 10bee from Fa @ -aad rankagla 9i y So & ag & es S. eMehrnaea according to Fig <2 ZnnäOhUt die = dead: Laufi * illo des the two rows of racks =. pocket ends inner bib fringea 9 with the balls of the ball grater 11 eieoebliehlioh the tea tank 12 rinsed and placed on the Gel series 11 of the outer ring 8 age. The Xe $ eln of gberon Zugelrethe lo can now through the a Qal @ nlaufring 9 aebae & ten Ill & aten 13 aa 14 inserted eyden Bel, the execution example ft-Ich Fig. 2 occurs as an share Ms a8 er Xglyehe geres & ea Lsa railways and the flag areas ar di Tnariae tS ßih dpxoh 2Ulnt% ten un'terbrocheia and. It simplifies assembly in a known manner , the assembly are in a known manner derAaealafrisg ai Srhganseea 5; w ar Äa @ en la \ 1t1ng 8 with tapped 1l'1gen 16 'and the inner flange 2 bs a ndeobNR. geR l? verea so aa imealanfriR 2 or 9 a speed 18 tft a 4 drive incorporated.

Claims (1)

soh-utzansprach wiibier Seldyehkras, iMesaMeye grea beispielsweise Söhmenkbare Augbanten von Sa Drersn, Baßmaehi&ea oereFgleicen mit % wei desmgeö ; rdneten zugelreihene von denen die Kugeln der höher beanspraehten Reihe einen grögeren Durchmesser als die ZUZeln der ßeringer beanspruchten « eibe autweiseny da- duroh gekennzeiohnet, deS der die beiden Kugelreiben (394 'bzw*91 sss& $'-bsw. nfiag (1 sw. ) eieteilie auogobildet ist.
soh-utzansprach wiibier Seldyehkras, iMesaMeye grea for example Söhmenkbare Augbanten from Sa Drersn, Baßmaehi & ea oereFgleicen with% wei desmgeö; Allocated from them the balls the higher row a larger diameter than the ZuZeln of the ßeringer claimed «eibe autweisey there- marked by the fact that the two ball rubbers (394 'or * 91 sss &$' - e.g. nfiag (1 sw.) eieteilie auogo is formed.
DEK32705U 1959-07-30 1959-07-30 DOUBLE ROW BALL WHEEL. Expired DE1799530U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK32705U DE1799530U (en) 1959-07-30 1959-07-30 DOUBLE ROW BALL WHEEL.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK32705U DE1799530U (en) 1959-07-30 1959-07-30 DOUBLE ROW BALL WHEEL.

Publications (1)

Publication Number Publication Date
DE1799530U true DE1799530U (en) 1959-11-05

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ID=32883063

Family Applications (1)

Application Number Title Priority Date Filing Date
DEK32705U Expired DE1799530U (en) 1959-07-30 1959-07-30 DOUBLE ROW BALL WHEEL.

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1154981B (en) * 1959-12-14 1963-09-26 Kugelfischer G Schaefer & Co Double row angular ball bearing
EP1887237A1 (en) * 2005-05-31 2008-02-13 Mitsubishi Heavy Industries, Ltd. Structure of slewing ring bearing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1154981B (en) * 1959-12-14 1963-09-26 Kugelfischer G Schaefer & Co Double row angular ball bearing
EP1887237A1 (en) * 2005-05-31 2008-02-13 Mitsubishi Heavy Industries, Ltd. Structure of slewing ring bearing
EP1887237A4 (en) * 2005-05-31 2011-11-02 Mitsubishi Heavy Ind Ltd Structure of slewing ring bearing

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