WO2008034417A2 - Unité palier destinée au positionnement axial d'un arbre - Google Patents

Unité palier destinée au positionnement axial d'un arbre Download PDF

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Publication number
WO2008034417A2
WO2008034417A2 PCT/DE2007/001656 DE2007001656W WO2008034417A2 WO 2008034417 A2 WO2008034417 A2 WO 2008034417A2 DE 2007001656 W DE2007001656 W DE 2007001656W WO 2008034417 A2 WO2008034417 A2 WO 2008034417A2
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
bearing
unit according
adjusting
axial
Prior art date
Application number
PCT/DE2007/001656
Other languages
German (de)
English (en)
Other versions
WO2008034417A3 (fr
Inventor
Jan Georgi
Arbogast Grunau
Original Assignee
Schaeffler Kg
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 Schaeffler Kg filed Critical Schaeffler Kg
Publication of WO2008034417A2 publication Critical patent/WO2008034417A2/fr
Publication of WO2008034417A3 publication Critical patent/WO2008034417A3/fr

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
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • 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
    • F16C19/54—Systems consisting of a plurality of bearings with rolling friction
    • F16C19/545—Systems comprising at least one rolling bearing for radial load in combination with at least one rolling bearing for 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
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing
    • 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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07—Fixing them on the shaft or housing with interposition of an element
    • F16C35/073—Fixing them on the shaft or housing with interposition of an element between shaft and inner race ring

Definitions

  • the invention relates to a bearing unit for axial shaft positioning with a roller bearing assembly.
  • DE 197 28 434 C2 includes a screw compressor, in which the axial shaft position similar to pinion shafts can be adjusted by an adjustable adjusting sleeve in the axial direction.
  • the positioning of the Einstellbüchse by means of separate adjustment screws.
  • the disadvantage here is that the arranged between housing and bearing Einstellbüchse engages strongly in the surrounding construction. Especially with screw compressors, however, it depends on a compact design, which is why a radially as close as possible arrangement of the rotors is sought.
  • thin-walled adjusting sleeves which is plastically deformed during assembly over a defined axial preload and thereby defines the shaft end position. If the setting sleeve is set too tightly by mistake, loosening may cause the clamping force to be lost and the sleeve to be replaced.
  • the object of the present invention is therefore to provide a bearing unit which makes possible an accurate axial positioning of the shaft without requiring much installation effort, wherein complicated adjustment work is to be avoided.
  • a setting means which is coupled via an axially parallel to the shaft adjusting thread to the shaft, so that upon rotation of the adjusting an axial Relatiwerschie- bung between the shaft and thrust bearing results.
  • a bearing unit comprises a rolling bearing arrangement and a shaft bushing with a sliding seat arranged in its bore, a fitting located in the outer diameter for receiving the inner ring of at least one roller bearing and a thread for adjusting the axial position of the shaft bushing and thus the position of the shaft bushing Wave.
  • the fit serves for centric insertion on a shaft seat.
  • the thread of the shaft sleeve engages in a serving for receiving a shaft nut shaft thread.
  • the shaft bushing preferably has recesses in its end face, which can be designed, for example, as blind holes, grooves or the like. A tool can intervene in these recesses. In this way, the rotation of the shaft bushing is facilitated.
  • the shaft bushing can be clamped axially.
  • a shaft nut can be used.
  • the inner rings located on the shaft bushing can be axially fixed on the shaft bushing.
  • a shaft nut or a forming ring is used.
  • a bearing unit comprises a rolling bearing arrangement with at least one axial bearing.
  • the thrust bearing has on the inner ring an axial extension with internal thread, which engages in an external thread of the shaft.
  • the thrust bearing is axially adjustable in the pushed onto the shaft seat state by rotation on the external thread of the shaft.
  • a major advantage of such an arrangement is that no additional components are needed because the adjustment function is integrated into the Axialla- ger.
  • an embodiment in which the extension over its inner circumference a radial groove and axially distributed over its end face has a plurality of recesses threaded. Screws for axial clamping of the inner ring on the shaft can be screwed into the recesses. In this embodiment can be dispensed with a shaft nut for axial clamping of the thrust bearing.
  • a further modified embodiment of the bearing unit according to the invention comprises a rolling bearing arrangement with at least one thrust bearing and at least one radial bearing, a spacer ring, which is arranged between radial bearings and thrust bearing shaft side, and an adjusting sleeve with external thread and two recesses for receiving two offset by 180 ° Mit vide dormitoren.
  • the follower pieces are engaged with two opposed grooves of the outer ring of the thrust bearing.
  • the shaft can be turned by turning the outer ring of the thrust bearing and the participants pieces associated rotation of the adjusting sleeve are positioned. Again, this solution requires only a small additional installation effort.
  • the adjusting sleeve may be provided according to an expedient embodiment with a plurality of radially distributed holes, which open into transverse bores. Through these holes lubricant can be introduced into the rolling bearing assembly. This makes it easy to lubricate the otherwise difficult to access bearings.
  • a bearing unit comprises in another embodiment, a rolling bearing assembly having at least one radial bearing and at least one thrust bearing, the inner ring has an extension in the radial direction to the shaft, and an adjusting sleeve with internal thread and a circumferential nose, which is in engagement with the extension of the thrust bearing.
  • the shaft can be positioned by turning the adjusting sleeve.
  • the adjusting sleeve can be clamped axially.
  • the shaft can be positioned by rotation of an adjusting nut having radial grooves for engaging an adjusting tool in the adjusting sleeve.
  • the axial tension of the adjusting sleeve with the adjusting nut takes place by turning the adjusting sleeve by means of adjusting tool. In this way, during the assembly process for the axial fixing of the outer rings in the housing, no additional chen auxiliary tools needed.
  • a bearing unit which has a rolling bearing arrangement with at least one radial bearing and at least one thrust bearing
  • the inner ring has a radial groove
  • an adjusting nut with window-shaped recesses for receiving pressure segments, with the radial groove are engaged.
  • the shaft can be positioned by turning the adjusting nut.
  • the pressure segments should hereby sit axially almost free of play in the adjusting nut and in the radial groove of the inner ring of the thrust bearing. They thus ensure an axial play-free positioning of the thrust bearing on the shaft in both directions.
  • the positive connection of inner ring, pressure segments and adjusting nut can not transmit moments. Therefore, turning the inner rings in the operating state can not cause any axial adjustment.
  • pressure segments preferably cylindrical rolling elements can be used.
  • the adjusting nut is axially clamped.
  • a further modified bearing unit comprises a rolling bearing arrangement with at least one thrust bearing and at least one radial bearing, the thrust bearing being exposed radially, and pitch profiles arranged on the end faces facing the respective other rolling bearing.
  • the pitch profiles are rotatable radially to each other.
  • the positioning of the shaft is done by twisting the pitch profiles towards each other.
  • adjusting rings are arranged between the radial and thrust bearings, which are positively connected to the end faces facing the adjacent rolling bearing and in which the angled end faces facing the respective other rolling bearing are incorporated.
  • the adjusting rings are arranged either on the inner rings or on the outer rings.
  • FIG. 1 shows a first design of a bearing unit according to the invention with an axially adjustable shaft bushing in a sectional view.
  • FIG. 2 shows a second design of the bearing unit according to the invention with at least one thrust bearing, which is axially adjustable by rotation, in a sectional view;
  • FIG. 3 is a sectional view of a modified embodiment of the bearing unit shown in FIG. 2;
  • FIG. 4 shows a third design of the bearing unit according to the invention with an adjusting sleeve with external thread, in a sectional view;
  • FIG. 5a shows the adjusting sleeve according to FIG. 4 in a cross-sectional view
  • Fig. 5b is a sectional view taken along the line xx in Fig. 5a; 6 shows a fourth design of the bearing unit according to the invention with an adjusting sleeve with internal thread, in a sectional view;
  • FIG. 7 is a sectional view of a modified embodiment of the bearing unit shown in FIG. 6; FIG.
  • FIG. 8 shows a fifth design of the bearing unit according to the invention with an adjusting nut with window-shaped recesses for receiving pressure segments, in a sectional representation
  • FIG. 10 is a partial sectional view of the bearing unit shown in FIG. 9; FIG.
  • FIG. 11 is a view of the inner rings of the rolling bearing of the bearing unit of FIG .. 10
  • Fig. 1 shows a first construction of the storage unit according to the invention in a sectional view.
  • a radial bearing 3 and a thrust bearing 5 is arranged in the housing 1.
  • the outer rings 7, 9 of the bearings are fixed in the housing.
  • the inner rings 11, 13 receive the shaft 15.
  • Between radial bearing 3 and thrust bearing 5 is a spacer ring 16, which ensures the maintenance of a minimum distance between the two camps.
  • the bearings 3, 5 receive a shaft 15.
  • On the shaft 15 there is a shaft bushing 17 with a sliding seat arranged in its bore and a fit located in the outside diameter. By means of fitting the shaft bushing 17 is inserted centrally on the shaft seat.
  • On the outer fit of the inner ring 13 of the thrust bearing 5 is pushed.
  • the shaft bushing 17 can also be dimensioned so that it also receives the inner ring of the radial bearing 11.
  • the shaft sleeve 17 is provided with a thread 19 which engages in a serving for receiving a shaft nut shaft thread.
  • the thread 19 of the shaft bushing 17 can be executed right or left handed.
  • a fine thread is used.
  • the rotation of the shaft bushing 17 is facilitated by the fact that recesses are provided in its front side, which allow by means of a suitable tool, the slight rotation of the shaft bushing 17 on the shaft 15.
  • the recesses may be designed as blind holes, grooves or the like.
  • the position of the shaft sleeve 17 is ensured by the fact that the sleeve is braced with a shaft nut 21.
  • the thrust bearing 5 is clamped axially by means of sleeve nut 23 on the shaft bushing 17.
  • the shaft nut 21 or sleeve nut 23 may also be another suitable support member may be used, for example, a forming ring raised.
  • Hg. 2 shows a second design of the storage unit according to the invention in a sectional view.
  • the radial bearing 3 and the thrust bearing 5 is arranged in the housing 1.
  • the bearings 3, 5 take the shaft 15.
  • the thrust bearing has on the inner ring 13 on an axial extension 25 with internal thread, which engages in an external thread of the shaft 15.
  • For axial adjustment of the thrust bearing 5 this is rotated to the external thread of the shaft 15.
  • Securing the axial shaft position can be done by countering by means of shaft nut 21.
  • Rg. 3 shows a modified embodiment of the design shown in Rg. 2 in a sectional view. In this embodiment, the function of the shaft nut in the axial extension 25 of the thrust bearing 5 is integrated.
  • the axial extension 25 has for this purpose over its inner circumference a radial groove and axially distributed over its end face a plurality of recesses threaded.
  • screws 27 can be screwed for axial clamping of the inner ring 13 on the shaft 15.
  • FIG. 4 shows a third design of the bearing unit according to the invention in a sectional view.
  • the radial bearing 3 and the thrust bearing 5 is arranged in the housing 1, the radial bearing 3 and the thrust bearing 5 is arranged.
  • the thrust bearing 5 may be, for example, a four-point bearing.
  • Bearings 3, 5 receive the shaft 15. In the outer ring 9 of the thrust bearing 5, two opposing grooves are introduced. Between radial bearing 3 and thrust bearing 5 is an adjusting sleeve 33, which in a thread in the
  • Housing bore is screwed.
  • the adjusting sleeve 33 has an external thread and two recesses for receiving two offset by 180 ° Mit vide consensus consensusen 35.
  • the Mitneh- mer publishede 35 are engaged with the grooves of the outer ring 9 of the thrust bearing 5 in engagement.
  • the positioning of the shaft 15 is effected by turning the outer ring 9 of the thrust bearing 5 and the rotation of the adjusting sleeve 33 connected thereto via the driving pieces 35.
  • the adjusting sleeve 33 is preferably secured against further rotation via an adhesive connection. After the shaft positioning, the adjusting sleeve 33 can be clamped axially via the outer ring 9 of the axial bearing 5 by a plate spring. In this way it is additionally protected against twisting.
  • FIG. 5 shows the adjusting sleeve 33 in detail, in a cross-sectional view in FIG. 5a and in FIG. 5b in a sectional view along the line xx.
  • the adjusting sleeve 33 can be provided with an additional lubricating function.
  • a plurality of radially distributed holes 37, in transverse bores 39 open into the adjusting sleeve 33 introduced. Through these holes 37, 39 lubricant can be introduced into the rolling bearing assembly.
  • FIG. 6 shows a fourth design of the bearing unit according to the invention in a sectional representation.
  • the radial bearing 3 and the thrust bearing 5 is arranged.
  • the bearings 3, 5 take the shaft 15.
  • the inner ring 13 of the thrust bearing 5 is provided with an extension 41 in the radial direction to the shaft 15.
  • the bearing unit further comprises an adjusting sleeve 43 with internal thread, which has a circumferential nose 45.
  • the nose 45 is engaged with the extension 41 of the thrust bearing 5 in engagement.
  • the positioning of the shaft 15 is effected by turning the adjusting sleeve 43.
  • the adjusting sleeve 43 is axially clamped to the thrust bearing 5 by means of shaft nut 21.
  • Fig. 7 shows a modified embodiment of the bearing unit shown in Fig. 6 in a sectional view.
  • the positioning of the shaft is realized here by rotation of an adjusting nut 45.
  • the adjusting nut 45 is provided with radial grooves for engaging a setting tool in the adjusting sleeve 43.
  • the axial clamping with the adjusting nut 45 is effected by turning the adjusting sleeve 43 by means of adjusting.
  • FIG. 8 shows a fifth design of the bearing unit according to the invention in a sectional representation.
  • the radial bearing 3 and the thrust bearing 5 is arranged.
  • the bearings 3, 5 take the shaft 15.
  • the inner ring 13 of the thrust bearing 5 has a radial groove, in which exactly fitting pressure segments 47 engage.
  • the pressure segments 47 are also in communication with an adjusting nut 45.
  • the adjusting nut 45 is provided with window-shaped recesses for this purpose.
  • the pressure segments 47 are inserted through the bore of the adjusting nut 45.
  • the shaft can be positioned by turning the adjusting nut.
  • For axial clamping in turn serves the shaft nut 21.
  • pressure segments 47 for example, cylindrical rolling elements can be used.
  • FIG. 9 shows a sixth design of the bearing unit according to the invention in a sectional representation.
  • the radial bearing 3 and the thrust bearing 5 is arranged.
  • the bearings 3, 5 take the shaft 15.
  • the thrust bearing 5 is radially released.
  • On the other rolling bearings facing end surfaces 49, 51 of the inner rings 11, 13 are pitch profiles. With the rotation of the inner rings 11, 13, the pitch profiles rotate radially to each other.
  • the thrust bearing 5 is set axially on the shaft 15 and thus the shaft 15 is positioned axially to the surrounding structure.
  • the fit of the bore of the thrust bearing 5 is opened before the adjustment process. Securing the axial shaft position is done by countering by means of shaft nut 21st
  • the pitch profiles can also be arranged on the respective opposite end faces of the outer rings 7, 9 of the bearings 3, 5.
  • a particularly advantageous embodiment uses additional adjusting rings, in which the pitch profiles are incorporated. These adjustment rings can be used when using conventional bearings.
  • the pitch profiles are in this case incorporated in the other rolling bearing facing faces of the Einstellringe.
  • the adjacent rolling bearing facing faces of the adjusting rings are positively connected to the rolling bearing, either on the inner rings or on the outer rings. They are entrained when turning the inner and outer rings and thereby caused an axial displacement of the thrust bearing on the shaft and thus the positioning of the shaft.
  • This principle can also be used for adjusting the axial air, eg for pitched angular contact ball bearings or tapered roller bearings.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)
  • Support Of The Bearing (AREA)

Abstract

L'invention concerne une unité palier destinée au positionnement axial d'un arbre (15), comprenant un dispositif palier à roulement pourvu d'au moins un palier axial (5), et un moyen de réglage qui est couplé à l'arbre (15) par un filetage de réglage s'étendant parallèlement à l'axe de l'arbre (15) de manière à entraîner un déplacement relatif axial entre l'arbre (15) et le palier axial (5) lors de la rotation du moyen de réglage. On prévoit comme moyen de réglage, par exemple, un manchon d'arbre (17) pourvu d'un filetage pour régler la position axiale du manchon (17) et donc la position de l'arbre (15). En variante, une bague interne (13) plaquée contre un palier axial (5) présente une extension axiale (25) dotée d'un filetage interne qui coopère avec un filetage externe de l'arbre (15). De même il est possible d'associer un anneau espaceur (16) qui est disposé entre le palier radial (3) et le palier axial (5) côté arbre, à une douille de réglage (33) dotée d'un filetage externe, la rotation de l'anneau externe (9) permettant de positionner l'arbre (15). D'autres variantes de ce principe de réglage sont possibles.
PCT/DE2007/001656 2006-09-22 2007-09-13 Unité palier destinée au positionnement axial d'un arbre WO2008034417A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610044903 DE102006044903A1 (de) 2006-09-22 2006-09-22 Lagereinheit zur axialen Wellenpositionierung
DE102006044903.7 2006-09-22

Publications (2)

Publication Number Publication Date
WO2008034417A2 true WO2008034417A2 (fr) 2008-03-27
WO2008034417A3 WO2008034417A3 (fr) 2008-07-03

Family

ID=38829247

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2007/001656 WO2008034417A2 (fr) 2006-09-22 2007-09-13 Unité palier destinée au positionnement axial d'un arbre

Country Status (2)

Country Link
DE (1) DE102006044903A1 (fr)
WO (1) WO2008034417A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103174755A (zh) * 2011-12-21 2013-06-26 德昌电机(深圳)有限公司 轴承安装结构及其装配方法

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DE102012005123A1 (de) * 2012-03-14 2013-09-19 Volkswagen Aktiengesellschaft Wälzlagerbefestigung und Kugelgewindemutter mit einer solchen
DE102012006633A1 (de) 2012-03-31 2013-10-02 Volkswagen Aktiengesellschaft Anordnung eines Maschinenelements auf einer Welle oder Achse sowie eine Welle oder Achse zur Fixierung eines Maschinenelements
DE102012221297B4 (de) * 2012-11-22 2020-07-02 Aktiebolaget Skf Lageranordnung

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DE3811519A1 (de) * 1988-04-06 1989-10-19 Emil Schwarz Einstelleinrichtung zur spielfreien lagereinstellung in radialer und axialer richtung einer welle durch eine einstellmutter
DE10008597A1 (de) * 1999-03-05 2000-09-21 Toyota Motor Co Ltd Sicherungsaufbau für eine Mutter

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3326613A (en) * 1963-08-16 1967-06-20 Fischer Ag Georg Antifriction bearing, especially for journalling spindles
DE3811519A1 (de) * 1988-04-06 1989-10-19 Emil Schwarz Einstelleinrichtung zur spielfreien lagereinstellung in radialer und axialer richtung einer welle durch eine einstellmutter
DE10008597A1 (de) * 1999-03-05 2000-09-21 Toyota Motor Co Ltd Sicherungsaufbau für eine Mutter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103174755A (zh) * 2011-12-21 2013-06-26 德昌电机(深圳)有限公司 轴承安装结构及其装配方法

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WO2008034417A3 (fr) 2008-07-03
DE102006044903A1 (de) 2008-04-03

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