WO2022238268A1 - Bearing assembly of a transfer case designed as a differential gear - Google Patents

Bearing assembly of a transfer case designed as a differential gear Download PDF

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Publication number
WO2022238268A1
WO2022238268A1 PCT/EP2022/062357 EP2022062357W WO2022238268A1 WO 2022238268 A1 WO2022238268 A1 WO 2022238268A1 EP 2022062357 W EP2022062357 W EP 2022062357W WO 2022238268 A1 WO2022238268 A1 WO 2022238268A1
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WO
WIPO (PCT)
Prior art keywords
bearing
axial
bearings
radial
bearing arrangement
Prior art date
Application number
PCT/EP2022/062357
Other languages
German (de)
French (fr)
Inventor
Matthias WESA
Tobias Buban
Original Assignee
Zf Friedrichshafen Ag
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Publication date
Application filed by Zf Friedrichshafen Ag filed Critical Zf Friedrichshafen Ag
Publication of WO2022238268A1 publication Critical patent/WO2022238268A1/en

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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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/44—Needle bearings
    • F16C19/48—Needle bearings with two or more rows of needles
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F16C19/381—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with at least one row for radial load in combination with at least one row 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
    • 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
    • F16C35/077—Fixing them on the shaft or housing with interposition of an element between housing and outer race ring
    • 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
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/38—Constructional details
    • F16H48/40—Constructional details characterised by features of the rotating cases
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • 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
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/65—Gear shifting, change speed gear, gear box
    • 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
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/38—Constructional details
    • F16H48/40—Constructional details characterised by features of the rotating cases
    • F16H2048/405—Constructional details characterised by features of the rotating cases characterised by features of the bearing of the rotating case
    • 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
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears

Definitions

  • the present invention relates to a bearing arrangement of a transfer case of a vehicle designed as a differential gear according to the type defined in more detail in the preamble of patent claim 1.
  • transfer gears in particular differential gears
  • differential gears are mounted in a housing via prestressed tapered roller bearings.
  • a fixed/loose bearing with, for example, deep groove ball bearings can also be used in the differential gear in order to eliminate the otherwise required preload of the bearing used in the differential gear.
  • deep groove ball bearings it has been shown that this results in considerable assembly effort. Furthermore, only a low power density is created by the deep groove ball bearings.
  • the present invention is based on the object of proposing a bearing arrangement of a transfer case designed as a differential gear and an electric drive with the bearing arrangement, in which the most efficient, cost-effective and low-assembly bearing possible is realized.
  • a bearing arrangement of a transfer case of a vehicle designed as a differential gear is proposed, with a differential carrier of the differential gear being mounted in a housing via axial bearings and radial bearings.
  • a first axial bearing and a second axial bearing are provided, which are jointly assigned to a radially extending housing collar for supporting axial forces. Because the two axial bearings are assigned to a common housing collar, the axial forces that occur are guided into the housing in a targeted and structurally very compact manner.
  • This has the advantage that thermal expansion of the differential gear has no effect on the proposed bearing arrangement, so that no preloaded axial bearings are required.
  • an optimized, non-oversized bearing arrangement of the differential gear is implemented, which is very efficient and cost-effective and, moreover, is easy to assemble.
  • the housing collar can be varied in terms of shape and geometry.
  • An embodiment that is particularly simple, particularly for assembly provides that the annular housing collar, which is directed radially inwards from a housing wall, is aligned coaxially with one of the output shafts of the differential gear.
  • the housing collar, which runs annularly on the housing wall is arranged radially on the outside around one of the output shafts of the differential gear.
  • the axial housing-side support of the differential gear is realized only via the two axial bearings, in which the first axial bearing is supported or mounted on the one hand on the differential cage side and on the other hand on a first axial side of the housing collar and the second axial bearing on the one hand on the differential cage side and on the other hand on a is supported or mounted on the second axial side of the housing collar.
  • the axial bearings are set with a defined tolerance or with a defined air gap, which on the one hand ensures a sufficiently stable connection of the axial bearings and on the other hand a bearing realized independently of thermal expansion of the housing, so that with the proposed bearing arrangement with maximum power density, high efficiency is achieved through low drag losses.
  • a construction of the bearing arrangement which is not only structurally compact but also efficient is created in that at least one of the radial bearings is assigned to the housing collar.
  • one of the radial bearings is arranged in the direct axial vicinity of the housing collar and the axial bearing mounted on it. It is particularly advantageous if a radial bearing is provided radially inside the housing collar. Viewed radially, the radial bearing is then arranged between the output shaft and the housing collar. It is advantageous here for the structurally compact structure that the radial bearing is supported or mounted on the one hand on a radial side of the housing collar and on the other hand on the differential cage side.
  • an electric drive for a vehicle with the bearing arrangement described above is also claimed, in which at least one electric machine is connected via a transmission, in particular a spur gear transmission or the like, to the output transfer case, for example is.
  • FIG. 1 shows a schematic sectional view of a first embodiment variant of a bearing arrangement according to the invention of a transfer case designed as a differential gear of a vehicle;
  • FIG. 2 shows a schematic sectional view of a second embodiment variant of the bearing arrangement according to the invention
  • 3 shows a schematic view of an electric drive of a vehicle according to the invention with the bearing arrangement.
  • FIGS. 1 to 3 different embodiment variants of a bearing arrangement according to the invention of a transfer case designed as a differential gear 1 of a vehicle and an electric drive for a vehicle with the bearing arrangement are shown by way of example.
  • the differential gear 1 is designed as a bevel gear differential gear.
  • the proposed bearing arrangement of the differential gear 1 provides that a differential carrier 2 of the differential gear 1 is mounted in a housing 7 via a first axial bearing 3 and a second axial bearing 4 and via a first radial bearing 5 and a second radial bearing 6 .
  • Both the axial bearings 3.4 and the radial bearings 5.6 are designed as needle bearings, for example.
  • first axial bearing 3 and the second axial bearing 4 are jointly assigned to a radially running housing collar 8 for supporting the axial force.
  • the annular housing collar 8 is directed radially inwards from a housing wall and is arranged coaxially with one of the output shafts 9,10. Furthermore, the housing collar 8 has a first axial side 11 and a second axial side 12 arranged opposite the first axial side 11 . In addition, a radial side 13 arranged between the first and the second axial side 11, 12 is provided on the housing collar.
  • the first axial bearing 3 is supported on the one hand on the differential cage side and on the other hand on the first axial side 11 of the housing collar 8, while the second axial bearing 4 is supported on the one hand on the differential cage side and on the other hand on the second axial side 12 of the shaft collar 8.
  • a shaft nut designed as a shaft lock 14 is provided for the second axial bearing 4 .
  • the distance between the two axial bearings 3, 4 is as small as possible when viewed axially of the differential gear 1 associated radial bearing 5, 6 also associated with the housing collar 8. As a result, a very compact bearing arrangement is created overall.
  • the first radial bearing 5 seen axially, is arranged between the first axial bearing 3 and the second axial bearing 4 on the housing collar 8, with the first radial bearing 5 on the one hand on the radial side 13 of the Housing collar 8 and on the other hand is supported on the differential cage side.
  • the second variant embodiment of the bearing arrangement according to FIG. The first radial bearing 5 is thus supported on the one hand on the differential cage side and on the other hand on the housing side.
  • a further housing collar 8A with a radial contact surface 13A can be provided for support on the housing side.
  • FIG. 3 shows a schematic representation of an electric drive according to the invention for a vehicle with the bearing arrangement according to the invention.
  • the electric drive comprises an electric machine 15, which is connected via the intermediate shaft 16 of the transmission gear 17, which z. B. is designed as a 2-stage spur gear ratio, with the differential gear 1 is drivingly connected.
  • the differential gear 1 is designed as a bevel gear differential and drives the two output shafts 9, 10 of the vehicle.
  • the transmission gear 17 can also consist of several gears.
  • the transmission gear 17 can be designed as a planetary gear with or without spur gear transmission stages. Reference sign

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Details Of Gearings (AREA)
  • Retarders (AREA)

Abstract

The invention relates to a bearing assembly of a transfer case of a vehicle, said transfer case being designed as a differential gear (1), wherein a differential cage (2) of the differential gear (1) is supported in a housing (7) via axial bearings (3, 4) and radial bearings (5, 6), and at least one first axial bearing (3) and a second axial bearing (4) are provided which together are paired with a radially running housing collar (8) in order to support axial forces. The invention additionally relates to an electric drive comprising the bearing assembly.

Description

Lageranordnung eines als Differentialgetriebe ausgeführten Verteileraetriebes Bearing arrangement of a distributor drive designed as a differential gear
Die vorliegende Erfindung betrifft eine Lageranordnung eines als Differentialgetriebe ausgeführten Verteilergetriebes eines Fahrzeuges gemäß der im Oberbegriff des Pa- tentanspruchs 1 näher definierten Art. The present invention relates to a bearing arrangement of a transfer case of a vehicle designed as a differential gear according to the type defined in more detail in the preamble of patent claim 1.
Aus der Fahrzeugtechnik ist es allgemein bekannt, dass Verteilergetriebe, insbeson- dere Differentialgetriebe über vorgespannte Kegelrollenlager in einem Gehäuse gela- gert sind. Ferner kann anstelle der Kegelrollenlager auch eine Fest-Loslagerung mit zum Beispiel Rillenkugellager bei dem Differentialgetriebe eingesetzt werden, um die ansonsten erforderliche Vorspannung der verwendeten Lagerung des Differentialge- triebes entfallen zu lassen. Jedoch hat sich bei der Verwendung von Rillenkugellager gezeigt, dass sich dabei ein erheblicher Montageaufwand ergibt. Ferner wird durch die Rillenkugellager nur eine geringe Leistungsdichte geschaffen. It is generally known from vehicle technology that transfer gears, in particular differential gears, are mounted in a housing via prestressed tapered roller bearings. Furthermore, instead of the tapered roller bearing, a fixed/loose bearing with, for example, deep groove ball bearings can also be used in the differential gear in order to eliminate the otherwise required preload of the bearing used in the differential gear. However, when using deep groove ball bearings, it has been shown that this results in considerable assembly effort. Furthermore, only a low power density is created by the deep groove ball bearings.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Lageranordnung eines als Differentialgetriebe ausgeführten Verteilergetriebes und einen elektrischen An- trieb mit der Lageranordnung vorzuschlagen, bei denen eine möglichst effiziente, kostengünstige und einen geringen Montageaufwand aufweisende Lagerung reali- siert wird. The present invention is based on the object of proposing a bearing arrangement of a transfer case designed as a differential gear and an electric drive with the bearing arrangement, in which the most efficient, cost-effective and low-assembly bearing possible is realized.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruches 1 bzw. 10 gelöst. Vorteilhafte und beanspruchte Weiterbildungen ergeben sich aus den Unteransprüchen und der Beschreibung sowie den Zeichnungen. This object is achieved according to the invention by the features of patent claims 1 and 10, respectively. Advantageous and claimed developments result from the dependent claims and the description as well as the drawings.
Somit wird eine Lageranordnung eines als Differentialgetriebe ausgeführten Verteiler- getriebes eines Fahrzeuges vorgeschlagen, wobei ein Differentialkorb des Differenti- algetriebes über Axiallager und Radiallager in einem Gehäuse gelagert ist. Um eine möglichst effiziente, kostengünstige und einen geringen Montageaufwand aufwei- sende Lagerung zu schaffen, ist vorgesehen, dass zumindest ein erstes Axiallager und ein zweites Axiallager vorgesehen sind, die gemeinsam einem radial verlaufen- den Gehäusebund zur Axialkraftabstützung zugeordnet sind. Dadurch, dass die beiden Axiallager einem gemeinsamen Gehäusebund zugeordnet sind, werden die auftretenden Axialkräfte gezielt und konstruktiv sehr kompakt in das Gehäuse geleitet. Dies hat den Vorteil, dass thermische Ausdehnungen des Differen- zialgetriebes keine Auswirkungen auf die vorgeschlagene Lageranordnung haben, sodass keine vorgespannten Axiallager erforderlich sind. Demzufolge wird eine opti- mierte nicht überdimensionierte Lageranordnung des Differentialgetriebes realisiert, welche sehr effizient und kostengünstig ist und darüber hinaus montagefreundlich ist. Thus, a bearing arrangement of a transfer case of a vehicle designed as a differential gear is proposed, with a differential carrier of the differential gear being mounted in a housing via axial bearings and radial bearings. In order to create a bearing that is as efficient and cost-effective as possible and requires little assembly effort, it is provided that at least a first axial bearing and a second axial bearing are provided, which are jointly assigned to a radially extending housing collar for supporting axial forces. Because the two axial bearings are assigned to a common housing collar, the axial forces that occur are guided into the housing in a targeted and structurally very compact manner. This has the advantage that thermal expansion of the differential gear has no effect on the proposed bearing arrangement, so that no preloaded axial bearings are required. As a result, an optimized, non-oversized bearing arrangement of the differential gear is implemented, which is very efficient and cost-effective and, moreover, is easy to assemble.
Bei der vorgeschlagenen Lageranordnung kann der Gehäusebund in Form und Geo- metrie variiert gestaltet werden. Eine insbesondere für die Montage besonders einfa- che Ausführung sieht vor, dass der von einer Gehäusewand nach radial innen ge- richtete, ringförmig verlaufene Gehäusebund koaxial zu einer der Abtriebswellen des Differentialgetriebes ausgerichtet ist. Demzufolge ist der ringförmig an der Gehäuse- wand verlaufende Gehäusebund radial außen um eine der Abtriebswellen des Diffe- rentialgetriebes angeordnet. In the proposed bearing arrangement, the housing collar can be varied in terms of shape and geometry. An embodiment that is particularly simple, particularly for assembly, provides that the annular housing collar, which is directed radially inwards from a housing wall, is aligned coaxially with one of the output shafts of the differential gear. As a result, the housing collar, which runs annularly on the housing wall, is arranged radially on the outside around one of the output shafts of the differential gear.
Bei der vorgeschlagenen Lageranordnung wird die axiale gehäuseseitige Abstützung des Differentialgetriebes nur über die beiden Axiallager realisiert, in dem das erste Axiallager einerseits differentialkorbseitig und andererseits an einer ersten Axialseite des Gehäusebundes abgestützt bzw. gelagert ist und das zweite Axiallager einer- seits differentialkorbseitig und andererseits an einer zweiten Axialseite des Gehäuse- bundes abgestützt bzw. gelagert ist. In the proposed bearing arrangement, the axial housing-side support of the differential gear is realized only via the two axial bearings, in which the first axial bearing is supported or mounted on the one hand on the differential cage side and on the other hand on a first axial side of the housing collar and the second axial bearing on the one hand on the differential cage side and on the other hand on a is supported or mounted on the second axial side of the housing collar.
Zur Befestigung der Axiallager ist beispielsweise vorgesehen, dass diese über eine Wellensicherung gemeinsam an dem Gehäuse erfolgt. Als Wellensicherung kann beispielsweise eine Wellenmutter oder dergleichen verwendet werden, welche bei- spielsweise auf einen Anschlag oder dergleichen fest verschraubt wird. Auf diese Weise werden die Axiallager mit einer definierten Toleranz bzw. mit einem definierten Luftspalt eingestellt, welches einerseits eine ausreichend stabile Anbindung der Axi- allager und andererseits eine unabhängig von thermischen Ausdehnungen des Ge- häuses realisierte Lagerung gewährleistet, sodass mit der vorgeschlagenen Lageran- ordnung bei maximaler Leistungsdichte eine hohe Effizienz durch geringe Schlepp- verluste realisiert wird. Ein nicht nur konstruktiv kompakter, sondern auch effizienter Aufbau der Lageranord- nung wird dadurch geschaffen, dass zumindest eines der Radiallager dem Gehäuse- bund zugeordnet ist. Beispielsweise ist es denkbar, dass eines der Radiallager in di- rekter axialer Nachbarschaft zu dem Gehäusebund und den daran gelagerten Axial- lager angeordnet ist. Besonders vorteilhaft ist es, wenn ein Radiallager radial inner- halb des Gehäusebundes vorgesehen ist. Das Radiallager ist dann radial gesehen zwischen der Abtriebswelle und dem Gehäusebund angeordnet. Hierbei ist es für den konstruktiv kompakten Aufbau vorteilhaft, dass das Radiallager einerseits an ei- ner Radialseite des Gehäusebundes und andererseits differentialkorbseitig abge- stützt bzw. gelagert ist. In order to fasten the axial bearings, provision is made, for example, for this to be done together on the housing via a shaft lock. For example, a shaft nut or the like can be used to secure the shaft, which is screwed tightly to a stop or the like, for example. In this way, the axial bearings are set with a defined tolerance or with a defined air gap, which on the one hand ensures a sufficiently stable connection of the axial bearings and on the other hand a bearing realized independently of thermal expansion of the housing, so that with the proposed bearing arrangement with maximum power density, high efficiency is achieved through low drag losses. A construction of the bearing arrangement which is not only structurally compact but also efficient is created in that at least one of the radial bearings is assigned to the housing collar. For example, it is conceivable that one of the radial bearings is arranged in the direct axial vicinity of the housing collar and the axial bearing mounted on it. It is particularly advantageous if a radial bearing is provided radially inside the housing collar. Viewed radially, the radial bearing is then arranged between the output shaft and the housing collar. It is advantageous here for the structurally compact structure that the radial bearing is supported or mounted on the one hand on a radial side of the housing collar and on the other hand on the differential cage side.
Durch die Verwendung von Nadellager sowohl für die Axiallager als auch für die Ra- diallager werden nicht nur die Herstellungskosten, sondern auch das Gewicht der La- geranordnung deutlich reduziert und somit die Effizienz gesteigert. Es sind gegebe- nenfalls auch andere Lagerarten einsetzbar. Through the use of needle bearings both for the axial bearings and for the radial bearings, not only the manufacturing costs but also the weight of the bearing arrangement are significantly reduced and the efficiency is thus increased. If necessary, other bearing types can also be used.
Im Rahmen eines weiteren Aspekts der vorliegenden Erfindung wird auch ein elektri- scher Antrieb für ein Fahrzeug mit der vorbeschriebenen Lageranordnung bean- sprucht, bei der zumindest eine elektrische Maschine über ein Übersetzungsgetriebe, insbesondere eine Stirnradübersetzung oder dergleichen mit dem als zum Beispiel Abtrieb-Verteilergetriebe verbunden ist. Within the scope of a further aspect of the present invention, an electric drive for a vehicle with the bearing arrangement described above is also claimed, in which at least one electric machine is connected via a transmission, in particular a spur gear transmission or the like, to the output transfer case, for example is.
Nachfolgend wird die vorliegende Erfindung anhand der Zeichnungen näher erläu- tert. The present invention is explained in more detail below with reference to the drawings.
Es zeigen: Show it:
Fig. 1 eine schematische geschnittene Ansicht einer ersten Ausführungsvariante ei- ner erfindungsgemäßen Lageranordnung eines als Differentialgetriebe ausge- führten Verteilergetriebes eines Fahrzeuges; 1 shows a schematic sectional view of a first embodiment variant of a bearing arrangement according to the invention of a transfer case designed as a differential gear of a vehicle;
Fig. 2 eine schematische geschnittene Ansicht einer zweiten Ausführungsvariante der erfindungsgemäßen Lageranordnung; und Fig. 3 eine schematische Ansicht eines erfindungsgemäßen elektrischen Antriebes eines Fahrzeuges mit der Lageranordnung. 2 shows a schematic sectional view of a second embodiment variant of the bearing arrangement according to the invention; and 3 shows a schematic view of an electric drive of a vehicle according to the invention with the bearing arrangement.
In den Figuren 1 bis 3 sind beispielhaft verschiedene Ausführungsvarianten einer er- findungsgemäßen Lageranordnung eines als Differentialgetriebe 1 ausgeführten Ver- teilergetriebes eines Fahrzeuges sowie ein elektrischer Antrieb für ein Fahrzeug mit der Lageranordnung beispielhaft dargestellt. In FIGS. 1 to 3, different embodiment variants of a bearing arrangement according to the invention of a transfer case designed as a differential gear 1 of a vehicle and an electric drive for a vehicle with the bearing arrangement are shown by way of example.
Unabhängig von den jeweiligen Ausführungsvarianten ist das Differentialgetriebe 1 als Kegelrad-Differentialgetriebe ausgeführt. Bei der vorgeschlagenen Lageranord- nung des Differentialgetriebes 1 ist vorgesehen, dass ein Differentialkorb 2 des Diffe- rentialgetriebes 1 über ein erstes Axiallager 3 und ein zweites Axiallager 4 sowie über ein erstes Radiallager 5 und ein zweites Radiallager 6 in einem Gehäuse 7 ge- lagert ist. Sowohl die Axiallager 3,4 als auch die Radiallager 5,6 sind beispielhaft als Nadellager ausgeführt. Regardless of the respective design variants, the differential gear 1 is designed as a bevel gear differential gear. The proposed bearing arrangement of the differential gear 1 provides that a differential carrier 2 of the differential gear 1 is mounted in a housing 7 via a first axial bearing 3 and a second axial bearing 4 and via a first radial bearing 5 and a second radial bearing 6 . Both the axial bearings 3.4 and the radial bearings 5.6 are designed as needle bearings, for example.
Um eine besonders effiziente und kostengünstige sowie einen geringen Bauraumbe- darf aufweisende sowie besonders einfach zu montierende Lagerung zu schaffen, ist vorgesehen, dass das erste Axiallager 3 und das zweites Axiallager 4 gemeinsam ei- nem radial verlaufenden Gehäusebund 8 zur Axialkraftabstützung zugeordnet sind. In order to create a particularly efficient and inexpensive bearing that requires little installation space and is particularly easy to assemble, it is provided that the first axial bearing 3 and the second axial bearing 4 are jointly assigned to a radially running housing collar 8 for supporting the axial force.
Der ringförmige Gehäusebund 8 ist von einer Gehäusewand aus nach radial innen gerichtet und ist koaxial zu einer der Abtriebswellen 9,10 angeordnet. Ferner weist der Gehäusebund 8 eine erste Axialseite 11 und eine gegenüberliegend zu der ers- ten Axialseite 11 angeordnete zweite Axialseite 12 auf. Zudem ist eine zwischen der ersten und der zweiten Axialseite 11 , 12 angeordnete Radialseite 13 an dem Gehäu- sebund vorgesehen. The annular housing collar 8 is directed radially inwards from a housing wall and is arranged coaxially with one of the output shafts 9,10. Furthermore, the housing collar 8 has a first axial side 11 and a second axial side 12 arranged opposite the first axial side 11 . In addition, a radial side 13 arranged between the first and the second axial side 11, 12 is provided on the housing collar.
Das erste Axiallager 3 ist einerseits differentialkorbseitig und andererseits an der ers- ten Axialseite 11 des Gehäusebundes 8 abgestützt, während das zweite Axiallager 4 einerseits differentialkorbseitig und andererseits an der zweiten Axialseite 12 des Wellenbundes 8 abgestützt ist. Zur Befestigung des ersten Axiallager 3 und des zweiten Axiallagers 4 ist eine als Wellensicherung 14 ausgeführte Wellenmutter vor- gesehen. The first axial bearing 3 is supported on the one hand on the differential cage side and on the other hand on the first axial side 11 of the housing collar 8, while the second axial bearing 4 is supported on the one hand on the differential cage side and on the other hand on the second axial side 12 of the shaft collar 8. For fastening the first axial bearing 3 and the A shaft nut designed as a shaft lock 14 is provided for the second axial bearing 4 .
Dadurch, dass die beiden Axiallager 3, 4 gegenüberliegend an dem Gehäusebund 8 gemeinsam angeordnet sind, ergibt sich axial gesehen ein möglichst geringer Ab- stand zwischen den beiden Axiallagern 3, 4. Neben den beiden Axiallagern 3, 4 ist zudem eines der dem Differentialkorb 2 des Differentialgetriebes 1 zugeordneten Ra- diallager 5, 6 ebenfalls dem Gehäusebund 8 zugeordnet. Dadurch wird insgesamt eine sehr kompakte Lageranordnung geschaffen. Because the two axial bearings 3, 4 are arranged opposite one another on the housing collar 8, the distance between the two axial bearings 3, 4 is as small as possible when viewed axially of the differential gear 1 associated radial bearing 5, 6 also associated with the housing collar 8. As a result, a very compact bearing arrangement is created overall.
Bei der in Figur 1 dargestellten ersten Ausführungsvariante der Lageranordnung ist vorgesehen, dass das erste Radiallager 5 axial gesehen zwischen dem ersten Axial- lager 3 und dem zweiten Axiallager 4 an dem Gehäusebund 8 angeordnet ist, wobei das erste Radiallager 5 einerseits an der Radialseite 13 des Gehäusebundes 8 und andererseits differentialkorbseitig abgestützt ist. In the first embodiment variant of the bearing arrangement shown in Figure 1, it is provided that the first radial bearing 5, seen axially, is arranged between the first axial bearing 3 and the second axial bearing 4 on the housing collar 8, with the first radial bearing 5 on the one hand on the radial side 13 of the Housing collar 8 and on the other hand is supported on the differential cage side.
Im Unterschied zu der ersten Ausführungsvariante der Lageranordnung gemäß Figur 1 ist bei der zweiten Ausführungsvariante der Lageranordnung gemäß Figur 2 vorge- sehen, dass das erste Radiallager 5 axial gesehen unmittelbar neben dem zweiten Axiallager 4 angeordnet ist. Somit stützt sich das erste Radiallager 5 einerseits diffe- rentialkorbseitig und andererseits gehäuseseitig ab. Beispielsweise kann zur gehäu- seseitigen Abstützung ein weiterer Gehäusebund 8A mit einer radialen Anlagefläche 13A vorgesehen sein. In contrast to the first variant embodiment of the bearing arrangement according to FIG. 1, the second variant embodiment of the bearing arrangement according to FIG. The first radial bearing 5 is thus supported on the one hand on the differential cage side and on the other hand on the housing side. For example, a further housing collar 8A with a radial contact surface 13A can be provided for support on the housing side.
In Figur 3 ist schematisch ein erfindungsgemäßer elektrischer Antrieb für ein Fahr- zeug mit der erfindungsgemäßen Lageranordnung dargestellt. Der elektrische An- trieb umfasst eine elektrische Maschine 15, die über die Zwischenwelle 16 des Über- setzungsgetriebes 17, welches z. B. als 2-stufige Stirnradübersetzung ausgeführt ist, mit dem Differentialgetriebe 1 antriebsmäßig verbunden ist. Das Differentialgetriebe 1 ist als Kegelraddifferential ausgeführt und treibt die beiden Abtriebswellen 9, 10 des Fahrzeuges an. Das Übersetzungsgetriebe 17 kann auch aus mehreren Getrieben bestehen. Beispielsweise kann das Übersetzungsgetriebe 17 als Planetengetriebe mit oder ohne Stirnradübersetzungsstufen ausgeführt sein. Bezugszeichen FIG. 3 shows a schematic representation of an electric drive according to the invention for a vehicle with the bearing arrangement according to the invention. The electric drive comprises an electric machine 15, which is connected via the intermediate shaft 16 of the transmission gear 17, which z. B. is designed as a 2-stage spur gear ratio, with the differential gear 1 is drivingly connected. The differential gear 1 is designed as a bevel gear differential and drives the two output shafts 9, 10 of the vehicle. The transmission gear 17 can also consist of several gears. For example, the transmission gear 17 can be designed as a planetary gear with or without spur gear transmission stages. Reference sign
1 Differentialgetriebe 1 differential gear
2 Differentialkorb 2 differential carrier
3 erstes Axiallager 3 first thrust bearing
4 zweites Axiallager 4 second thrust bearing
5 erstes Radiallager 5 first radial bearing
6 zweites Radiallager 6 second radial bearing
7 Gehäuse 7 housing
8 Gehäusebund 8 case collar
8A weiterer Gehäusebund 8A further housing flange
9 Abtriebswelle 9 output shaft
10 Abtriebswelle 10 output shaft
11 erste Axialseite des Gehäusebundes 11 first axial side of the housing collar
12 zweite Axialseite des Gehäusebundes 12 second axial side of the housing collar
13 Radialseite des Gehäusebundes 13 Radial side of the housing collar
13A radiale Anlagefläche des weiteren Gehäusebundes13A radial contact surface of the further housing collar
14 Wellensicherung als Wellenmutter 14 Shaft lock as a shaft nut
15 elektrische Maschine 15 electric machine
16 Zwischenwelle 16 intermediate shaft
17 Übersetzungsgetriebe 17 transmission gears

Claims

Patentansprüche patent claims
1. Lageranordnung eines als Differentialgetriebe (1) ausgeführten Verteilergetriebes eines Fahrzeuges, wobei ein Differentialkorb (2) des Differentialgetriebes (1) über Axiallager (3,4) und Radiallager (5,6) in einem Gehäuse (7) gelagert ist, dadurch ge- kennzeichnet, dass zumindest ein erstes Axiallager (3) und ein zweites Axiallager (4) vorgesehen sind, die gemeinsam einem radial verlaufenden Gehäusebund (8) zur Axialkraftabstützung zugeordnet sind. 1. Bearing arrangement of a transfer case designed as a differential gear (1) of a vehicle, wherein a differential carrier (2) of the differential gear (1) is mounted in a housing (7) via axial bearings (3,4) and radial bearings (5,6), characterized ge - indicates that at least a first axial bearing (3) and a second axial bearing (4) are provided, which are jointly assigned to a radially running housing collar (8) for supporting the axial force.
2. Lageranordnung nach Anspruch 1 , dadurch gekennzeichnet, dass der von einer Gehäusewand nach radial innen gerichtete, ringförmig verlaufene Gehäusebund (8) koaxial zu einer der Abtriebswellen (9,10) des Differentialgetriebe (1 ) ausgerichtet ist. 2. Bearing arrangement according to claim 1, characterized in that the ring-shaped housing collar (8) directed radially inwards from a housing wall is aligned coaxially with one of the output shafts (9,10) of the differential gear (1).
3. Lageranordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das erste Axiallager (3) einerseits differentialkorbseitig und andererseits an einer ersten Axialseite (11) des Gehäusebundes (8) abgestützt ist und dass das zweite Axiallager (4) einerseits differentialkorbseitig und andererseits an einer zweiten Axialseite (12) des Gehäusebundes (8) abgestützt ist. 3. Bearing arrangement according to Claim 1 or 2, characterized in that the first axial bearing (3) is supported on the one hand on the differential cage side and on the other hand on a first axial side (11) of the housing collar (8) and in that the second axial bearing (4) on the one hand on the differential cage side and on the other hand a second axial side (12) of the housing collar (8) is supported.
4. Lageranordnung nach einem der vorangehenden Ansprüche, dadurch gekenn- zeichnet, dass das erste Axiallager (3) und das zweite Axiallager (4) über eine Wel- lensicherung (14) gemeinsam an dem Gehäusebund (8) befestigbar sind 4. Bearing arrangement according to one of the preceding claims, characterized in that the first axial bearing (3) and the second axial bearing (4) can be fastened together on the housing collar (8) via a shaft lock (14).
5. Lageranordnung nach einem der vorangehenden Ansprüche, dadurch gekenn- zeichnet, dass dem Differentialkorb (2) des Differentialgetriebes (1) zumindest ein erstes Radiallager (5) und ein zweites Radiallager (6) zugeordnet sind. 5. Bearing arrangement according to one of the preceding claims, characterized in that the differential carrier (2) of the differential gear (1) are assigned at least a first radial bearing (5) and a second radial bearing (6).
6. Lageranordnung nach Anspruch 5, dadurch gekennzeichnet, dass zumindest ei- nes der Radiallager (5, 6) dem Gehäusebund (8) zugeordnet ist. 6. Bearing arrangement according to claim 5, characterized in that at least one of the radial bearings (5, 6) is assigned to the housing collar (8).
7. Lageranordnung nach Anspruch 6, dadurch gekennzeichnet, dass eines der Radi- allager (5, 6) axial gesehen zwischen dem ersten und dem zweiten Axiallager (3, 4) an dem Gehäusebund (8) angeordnet ist, wobei das Radiallager (5, 6) einerseits an einer Radialseite (13) des Gehäusebundes (8) und andererseits differentialkorbseitig abgestützt ist. 7. Bearing arrangement according to claim 6, characterized in that one of the radial bearings (5, 6) seen axially between the first and the second axial bearing (3, 4) is arranged on the housing collar (8), the radial bearing (5, 6) on the one hand on a radial side (13) of the housing collar (8) and on the other hand on the differential cage side.
8. Lageranordnung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass eines der Radiallager (5, 6) axial gesehen unmittelbar neben einem der Axialla- ger (3, 4) angeordnet ist. 8. Bearing arrangement according to one of claims 1 to 6, characterized in that one of the radial bearings (5, 6), seen axially, is arranged immediately next to one of the axial bearings (3, 4).
9. Lageranordnung nach einem der vorangehenden Ansprüche, dadurch gekenn- zeichnet, dass die Axiallager (3, 4) und die Radiallager (5, 6) jeweils als Nadellager ausgeführt sind. 9. Bearing arrangement according to one of the preceding claims, characterized in that the axial bearings (3, 4) and the radial bearings (5, 6) are each designed as needle bearings.
10. Elektrischer Antrieb für ein Fahrzeug mit einer Lageranordnung nach einem der vorangehenden Ansprüche, wobei zumindest eine elektrische Maschine (15) über ein Übersetzungsgetriebe (17) mit einem als Differentialgetriebe (1) ausgeführten Vertei- lergetriebe verbunden ist. 10. Electric drive for a vehicle with a bearing arrangement according to one of the preceding claims, wherein at least one electric machine (15) is connected via a transmission gear (17) to a differential gear (1) designed as a transfer case.
PCT/EP2022/062357 2021-05-12 2022-05-06 Bearing assembly of a transfer case designed as a differential gear WO2022238268A1 (en)

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DE102021204809.9A DE102021204809A1 (en) 2021-05-12 2021-05-12 Bearing arrangement of a transfer case designed as a differential gear

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809444A (en) * 1971-12-24 1974-05-07 H Eckhardt Combined radial axial bearing
DE102012216235A1 (en) * 2012-09-13 2014-03-13 Schaeffler Technologies AG & Co. KG Transmission device with a transfer case and with a housing in which the transfer case is mounted

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10338635A1 (en) 2003-08-22 2005-03-17 Ina-Schaeffler Kg Differential gear for vehicles has differential cage rotatable in differential gear housing through ball bearing assembly having bearing pretension produced through plate spring

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809444A (en) * 1971-12-24 1974-05-07 H Eckhardt Combined radial axial bearing
DE102012216235A1 (en) * 2012-09-13 2014-03-13 Schaeffler Technologies AG & Co. KG Transmission device with a transfer case and with a housing in which the transfer case is mounted

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