WO2016055255A1 - Differential - Google Patents

Differential Download PDF

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Publication number
WO2016055255A1
WO2016055255A1 PCT/EP2015/071585 EP2015071585W WO2016055255A1 WO 2016055255 A1 WO2016055255 A1 WO 2016055255A1 EP 2015071585 W EP2015071585 W EP 2015071585W WO 2016055255 A1 WO2016055255 A1 WO 2016055255A1
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WIPO (PCT)
Prior art keywords
housing
gears
differential gear
gear according
formations
Prior art date
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PCT/EP2015/071585
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German (de)
French (fr)
Inventor
Rudolf Glassner
Original Assignee
Engineering Center Steyr Gmbh & Co Kg
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Publication of WO2016055255A1 publication Critical patent/WO2016055255A1/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
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F16H57/082—Planet carriers
    • 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
    • F16H48/10—Differential gearings with gears having orbital motion with orbital spur gears
    • F16H2048/106—Differential gearings with gears having orbital motion with orbital spur gears characterised by two sun gears
    • 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
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F16H2057/085—Bearings for orbital gears
    • 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
    • F16H48/10—Differential gearings with gears having orbital motion with orbital spur gears
    • F16H48/11—Differential gearings with gears having orbital motion with orbital spur gears having intermeshing planet gears

Definitions

  • the present invention relates to a differential, in particular a Stirnradaus istsgetriebe.
  • the differential comprises intermeshing epicyclic gears (also called planetary gears) and two central output spur gears of two output shafts, the epicyclic gears each meshing with one of the output spur gears, the epicyclic gears and the output spur gears being disposed in a housing.
  • Differential gears or differential gears are known per se and are used, for example, as axle differential in multi-lane vehicles. There is its purpose to drive two wheels so that they can turn in curves with different speeds but with the same driving force. The same purpose is served by the central differential in four-wheel drive vehicles, where power is to be distributed to two or more driven axles.
  • DE 1555887 A1 discloses a differential gear with first and second gears, which are coaxially aligned at a distance from each other and are each connected to leading in opposite directions axes.
  • a differential gear comprising intermeshing epicyclic gears and two central output spurs of two output shafts, the epicyclic gears each meshing with one of the output spur gears, the epicyclic gears and the output spur gears being arranged in a housing, the housing itself being used to support the Umlaufgan is formed and the planet gears are mounted directly on the housing.
  • the shape of the housing itself is designed so that a bearing of the epicyclic gears on the housing is possible.
  • the planetary gears are formed as externally toothed ring gears, with cavities around the respective axes of rotation of the planetary gears, and formations of the housing extend respectively into the cavities of the planetary gears, so that the planetary gears are mounted directly on the formations of the housing.
  • housings are particularly preferably cylindrical formations, in particular on each planet gear two cylindrical formations which extend axially from both sides into the cavities.
  • the housing on the outer side for each planet gear on a circular arc-shaped bulge wherein the bulge each embraces the outer contour of the planetary gear near.
  • the housing follows the minimum space requirement of the planetary gears.
  • the housing is composed of two half-shells.
  • the two half-shells along a wavy annular surface, which is formed by the circular arc-shaped bulges, joined and / or circular surfaces on which touch the two cylindrical formations - particularly preferably at both said joining surfaces.
  • the joining surfaces are normal to the axes of rotation of the planetary gears.
  • This shape of the half-shells allows a particularly rigid housing, allows a reduction of the sheet thickness and a closed shape, without the use of holes.
  • the joining surfaces of the housing are oil-tight joined, preferably welded, in particular by capacitor discharge welding, in order to achieve an oil seal of the differential gear.
  • the housing may consist of at least one, preferably of two sheet metal formed parts, in particular of two identical, deep-drawn, cup-shaped sheet metal shells.
  • oil-tight seals may be provided between the housing and the output shafts.
  • FIG. 1 is a side sectional view of a differential gear according to the invention corresponding to the section A-A of FIG. 2.
  • Fig. 2 is a sectional view of a differential gear according to the invention from the front, corresponding to the section B-B of Fig. 1.
  • Fig. 3 is a detailed view of a detail of Fig. 2nd
  • an inventive differential gear is shown in two sectional views.
  • the differential comprises eight Nander meshing epicyclic 1 and two central output spur gears 2 which are arranged axially parallel to the axes of rotation 4 of the epicyclic 1.
  • the epicyclic gears 1 each mesh with one of the output spur gears 2, namely, as shown in FIG. 2, alternately meshing one of the epicyclic gears with one output spur gear and the next epicyclic gear with the other output spur gear, so that each output spur gear meshes with four epicyclic gears altogether.
  • the planetary gears 1 and the output spur gears 2 are arranged in a housing 3, which forms the drive of the differential gear.
  • the planetary gears 1 are formed as externally toothed ring gears, with central cavities around the respective axes of rotation 4 of the planetary gears 1, and two cylindrical formations 5 of the housing 3 extend axially from both sides into the cavities of the planetary gears 1, so that the planet gears 1 directly to the cylindrical formations 5 of the housing 3 are mounted.
  • the housing 3 has on the outside for each planetary gear 1 on a circular arc-shaped bulge 6, wherein the bulge 6 each surrounds the outer contour of the planetary gear 1 near the planet wheel 1.
  • the housing 3 is composed of two half shells 7, 8, namely two identical, deep-drawn, cup-shaped sheet metal shells, which are composed in mirror symmetry.
  • the two half-shells 7, 8 are joined along a corrugated annular surface 9, which is formed by the circular arc-shaped bulges 6, and at eight circular surfaces 10, to which the two cylindrical formations 5 touch.
  • the joining surfaces 9, 10 are normal to all axes of rotation. 4
  • oil-tight seals are provided between the housing 3 and the output shafts - not shown . The only two openings of the housing 3 are those for the two output shafts.
  • Each planetary gear 1 is drivingly connected to three meshing engagements: one engagement with one output spur gear 2 and one engagement with each of the two adjacent epicyclic gears 1.
  • the number of planetary gears 1 is eight. The geometric engagement conditions caused by the three tooth engagements severely limit the choice of teeth numbers.
  • the planetary gears 1 each have 10 teeth
  • the output spur gears 2 each have 16 teeth.
  • the ratio of the number of teeth of a Popestirnrades 2 to the number of teeth of a planetary gear 1 is 1, 6.
  • the doubling of the numbers of teeth of planet wheels 1 and output spur gears 2 also fulfills the installation conditions.
  • One of the output spur gears 2 is drive-connected via four gear meshes with four epicyclic gears 1.
  • These four epicyclic wheels 1 are drivingly connected via eight tooth engagements with a further four epicyclic wheels 1 arranged in the direction of rotation by 45 degrees, which in turn are drive-connected to the other output spur gear 2 via four tooth engagements.
  • the radial positioning of the output spur gears 2 takes place via the contact surfaces to the revolving wheels 1 (FIG. 2), the axial positioning via an annular surface to the half shell 7, 8 and in the plane of symmetry of the housing 3 via an annular surface to the respective other output spur gear 2 (FIG ).
  • FIG. 3 shows a detail of FIG. 2, in which the region of engagement between a planetary gear 1 and a starting gear 1 is shown.
  • Helical 2 is easy to see.
  • the meshing gears of the planetary gears 1 and the output spur gears 2 have an optimized shape in the root of the tooth.
  • the engaging involute is reshaped in the foot area. This leads to a strengthening of the toothing in this area and to a frictional rolling contact through the cylindrical contact surfaces of the head area and foot area, each of the meshing spur gears.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Retarders (AREA)

Abstract

A differential comprises planet gears (1) which mesh with each other and two central output spur gears (2) of two output shafts, each planet gear (1) meshing with one of the output spur gears (2), the planet gears (1) and the output spur gears (2) being arranged in a housing (3), and the housing (3) itself being designed for mounting the planet gears (1) and the planet gears (1) being mounted directly on the housing (3).

Description

Ausgleichsgetriebe  differential
Gebiet der Erfindung  Field of the invention
Die vorliegende Erfindung betrifft ein Ausgleichsgetriebe, insbesondere ein Stirnradausgleichsgetriebe. Das Ausgleichsgetriebe umfasst miteinander kämmende Umlaufräder (auch Planetenräder genannt) und zwei zentrale Ausgangsstirnräder zweier Ausgangswellen, wobei die Umlaufräder jeweils mit einem der Ausgangsstirnräder kämmen, wobei die Umlaufräder und die Ausgangsstirnräder in einem Gehäuse angeordnet sind. The present invention relates to a differential, in particular a Stirnradausgleichsgetriebe. The differential comprises intermeshing epicyclic gears (also called planetary gears) and two central output spur gears of two output shafts, the epicyclic gears each meshing with one of the output spur gears, the epicyclic gears and the output spur gears being disposed in a housing.
Stand der Technik Ausgleichsgetriebe oder Differentialgetriebe sind an sich bekannt und werden beispielsweise als Achsdifferential in mehrspurigen Fahrzeugen verwendet. Dort ist sein Zweck, zwei Räder so anzutreiben, dass sie in Kurven unterschiedlich schnell aber mit gleicher Vortriebskraft drehen können. Den gleichen Zweck hat das Zentraldifferential in allradgetriebe- nen Fahrzeugen, bei denen die Leistung auf zwei oder mehr angetriebene Achsen verteilt werden soll. PRIOR ART Differential gears or differential gears are known per se and are used, for example, as axle differential in multi-lane vehicles. There is its purpose to drive two wheels so that they can turn in curves with different speeds but with the same driving force. The same purpose is served by the central differential in four-wheel drive vehicles, where power is to be distributed to two or more driven axles.
So offenbart beispielsweise die DE 1555887 AI ein Differentialgetriebe mit ersten und zweiten Zahnrädern, die koaxial fluchtend im Abstand zuei- nander angeordnet sind und jeweils mit in entgegengesetzten Richtungen führenden Achsen verbunden sind. For example, DE 1555887 A1 discloses a differential gear with first and second gears, which are coaxially aligned at a distance from each other and are each connected to leading in opposite directions axes.
Aus der DE 10 2012 214 767 AI ist ein Differentialgetriebe bekannt, mit einem zum Umlauf um eine Differentialachse vorgesehenen Planetenträger der als Blechumformteil gefertigt ist. Zusammenfassung der Erfindung From DE 10 2012 214 767 AI a differential gear is known, with a provided for circulation around a differential axis planetary carrier is made as Blechumformteil. Summary of the invention
Es ist eine Aufgabe der Erfindung, ein Ausgleichsgetriebe anzugeben, dass nur wenige Einzelteile benötigt und kompakt und leicht gebaut werden kann. It is an object of the invention to provide a differential that only a few items needed and can be compact and easy to build.
Die Lösung der Aufgabe erfolgt durch ein Ausgleichsgetriebe umfassend miteinander kämmende Umlaufräder und zwei zentrale Ausgangsstirnrä- der zweier Ausgangswellen, wobei die Umlaufräder jeweils mit einem der Ausgangsstirnräder kämmen, wobei die Umlaufräder und die Ausgangsstirnräder in einem Gehäuse angeordnet sind, wobei das Gehäuse selbst zur Lagerung der Umlaufräder ausgebildet ist und die Umlaufräder direkt am Gehäuse gelagert sind. The object is achieved by a differential gear comprising intermeshing epicyclic gears and two central output spurs of two output shafts, the epicyclic gears each meshing with one of the output spur gears, the epicyclic gears and the output spur gears being arranged in a housing, the housing itself being used to support the Umlaufräder is formed and the planet gears are mounted directly on the housing.
Das Gehäuse, das die Umlaufräder aufnimmt und den Planetenträger für die Umlaufräder bildet, und somit üblicherweise den Eingang des Ausgleichsgetriebes darstellt, wird hierdurch direkt zur Lagerung der Umlaufräder genutzt, ohne zusätzliche Bauteile wie Lagerbolzen zu verwenden. Die Form des Gehäuses selbst ist dazu so ausgebildet, dass eine Lagerung der Umlaufräder am Gehäuse möglich ist. The housing which receives the planetary gears and forms the planetary carrier for the epicyclic gears, and thus usually represents the input of the differential gear, is thereby used directly for supporting the epicyclic gears, without using additional components such as bearing pins. The shape of the housing itself is designed so that a bearing of the epicyclic gears on the housing is possible.
Hierdurch kann auf zusätzliche Bauteile zur Lagerung der Umlaufräder verzichtet werden und somit auch Gewicht und Bauraum eingespart wer- den. As a result, it is possible to dispense with additional components for supporting the epicyclic wheels, thus also saving weight and installation space.
Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen, der Beschreibung sowie den beigefügten Zeichnungen angegeben. Vorzugsweise sind die Umlaufräder als außenverzahnte Hohlräder, mit Hohlräumen um die jeweiligen Drehachsen der Umlaufräder, ausgebildet und Ausformungen des Gehäuses reichen jeweils in die Hohlräume der Umlaufräder, so dass die Umlaufräder direkt auf den Ausformungen des Gehäuses gelagert sind. Further developments of the invention are specified in the dependent claims, the description and the accompanying drawings. Preferably, the planetary gears are formed as externally toothed ring gears, with cavities around the respective axes of rotation of the planetary gears, and formations of the housing extend respectively into the cavities of the planetary gears, so that the planetary gears are mounted directly on the formations of the housing.
Besonders bevorzugt sind diese Ausformungen des Gehäuses zylindrische Ausformungen, insbesondere an jedem Umlaufrad jeweils zwei zylindrische Ausformungen die axial von beiden Seiten in die Hohlräume reichen. These embodiments of the housing are particularly preferably cylindrical formations, in particular on each planet gear two cylindrical formations which extend axially from both sides into the cavities.
Bevorzugt weist das Gehäuse an der Außenseite für jedes Umlaufrad eine kreisbogenförmige Ausbuchtung auf, wobei die Ausbuchtung jeweils die Außenkontur des Umlaufrades nahe umgreift. Hierdurch wird eine besonders kompakte Bauform des Ausgleichsgetriebes ermöglicht, da das Ge- häuse dem minimalen Bauraumbedarf der Umlaufräder folgt. Preferably, the housing on the outer side for each planet gear on a circular arc-shaped bulge, wherein the bulge each embraces the outer contour of the planetary gear near. As a result, a particularly compact design of the differential gear is made possible because the housing follows the minimum space requirement of the planetary gears.
Bevorzugt ist das Gehäuse aus zwei Halbschalen zusammengesetzt. Preferably, the housing is composed of two half-shells.
Bevorzugt sind die zwei Halbschalen entlang einer gewellten Ringfläche, die durch die kreisbogenförmigen Ausbuchtungen gebildet wird, gefügt und/ oder an Kreisflächen, an welchen sich die jeweils zwei zylindrischen Ausformungen berühren - besonders bevorzugt an beiden genannten Fügeflächen. Die Fügeflächen stehen normal auf die Drehachsen der Umlaufräder. Preferably, the two half-shells along a wavy annular surface, which is formed by the circular arc-shaped bulges, joined and / or circular surfaces on which touch the two cylindrical formations - particularly preferably at both said joining surfaces. The joining surfaces are normal to the axes of rotation of the planetary gears.
Diese Formgebung der Halbschalen ermöglicht ein besonders steifes Gehäuse, ermöglicht eine Reduktion der Blechdicke und eine geschlossene Form, ohne der Verwendung von Bohrungen. Vorzugsweise sind die Fügeflächen des Gehäuses öldicht gefügt, bevorzugt geschweißt, insbesondere durch Kondensator-Entladungsschweißen, um eine Öldichtheit des Ausgleichsgetriebes zu erreichen. Das Gehäuse kann aus zumindest einem, bevorzugt aus zwei Blechumformteilen bestehen, insbesondere aus zwei baugleichen, tiefgezogenen, topfförmigen Blechschalen. This shape of the half-shells allows a particularly rigid housing, allows a reduction of the sheet thickness and a closed shape, without the use of holes. Preferably, the joining surfaces of the housing are oil-tight joined, preferably welded, in particular by capacitor discharge welding, in order to achieve an oil seal of the differential gear. The housing may consist of at least one, preferably of two sheet metal formed parts, in particular of two identical, deep-drawn, cup-shaped sheet metal shells.
Zur Gewährleistung der Öldichtheit können zwischen dem Gehäuse und den Ausgangswellen öldichte Abdichtungen vorgesehen sein. To ensure oil tightness, oil-tight seals may be provided between the housing and the output shafts.
Kurzbeschreibung der Zeichnungen Brief description of the drawings
Die Erfindung wird im Folgenden beispielhaft unter Bezugnahme auf die Zeichnungen beschrieben. The invention will now be described by way of example with reference to the drawings.
Fig. 1 ist eine seitliche Schnittansicht eines erfindungsgemäßen Ausgleichsgetriebes entsprechend dem Schnitt A-A der Fig. 2. 1 is a side sectional view of a differential gear according to the invention corresponding to the section A-A of FIG. 2.
Fig. 2 ist eine Schnittansicht eines erfindungsgemäßen Ausgleichsgetriebes von vorne, entsprechend dem Schnitt B-B der Fig. 1. Fig. 3 ist eine Detaildarstellung eines Ausschnitts aus Fig. 2. Fig. 2 is a sectional view of a differential gear according to the invention from the front, corresponding to the section B-B of Fig. 1. Fig. 3 is a detailed view of a detail of Fig. 2nd
Detaillierte Beschreibung der Erfindung Detailed description of the invention
In Fig. 1 und Fig. 2 ist ein erfindungsgemäßes Ausgleichsgetriebe in zwei Schnittansichten dargestellt. Das Ausgleichsgetriebe umfasst acht mitei- nander kämmende Umlaufräder 1 und zwei zentrale Ausgangsstirnräder 2 die achsparallel zu den Drehachsen 4 der Umlaufräder 1 angeordnet sind. Die Umlaufräder 1 kämmen jeweils mit einem der Ausgangsstirnräder 2, und zwar - wie in Fig. 2 dargestellt - kämmt jeweils abwechselnd eines der Umlaufräder mit dem einen Ausgangsstirnrad und das nächstfolgende Umlaufrad mit dem anderen Ausgangsstirnrad, so dass jedes Ausgangsstirnrad insgesamt mit vier Umlaufrädern kämmt. Die Umlaufräder 1 und die Ausgangsstirnräder 2 sind in einem Gehäuse 3 angeordnet, dass den Antrieb des Ausgleichsgetriebes bildet. In Fig. 1 and Fig. 2, an inventive differential gear is shown in two sectional views. The differential comprises eight Nander meshing epicyclic 1 and two central output spur gears 2 which are arranged axially parallel to the axes of rotation 4 of the epicyclic 1. The epicyclic gears 1 each mesh with one of the output spur gears 2, namely, as shown in FIG. 2, alternately meshing one of the epicyclic gears with one output spur gear and the next epicyclic gear with the other output spur gear, so that each output spur gear meshes with four epicyclic gears altogether. The planetary gears 1 and the output spur gears 2 are arranged in a housing 3, which forms the drive of the differential gear.
Die Umlaufräder 1 sind als außenverzahnte Hohlräder, mit zentralen Hohlräumen um die jeweiligen Drehachsen 4 der Umlaufräder 1 , ausgebildet und jeweils zwei zylindrische Ausformungen 5 des Gehäuses 3 reichen axial von beiden Seiten in die Hohlräume der Umlaufräder 1 , so dass die Umlaufräder 1 direkt auf den zylindrischen Ausformungen 5 des Gehäuses 3 gelagert sind. The planetary gears 1 are formed as externally toothed ring gears, with central cavities around the respective axes of rotation 4 of the planetary gears 1, and two cylindrical formations 5 of the housing 3 extend axially from both sides into the cavities of the planetary gears 1, so that the planet gears 1 directly to the cylindrical formations 5 of the housing 3 are mounted.
Das Gehäuse 3 weist an der Außenseite für jedes Umlaufrad 1 eine kreisbogenförmige Ausbuchtung 6 auf, wobei die Ausbuchtung 6 jeweils die Außenkontur des Umlaufrades 1 nahe am Umlaufrad 1 umgreift. The housing 3 has on the outside for each planetary gear 1 on a circular arc-shaped bulge 6, wherein the bulge 6 each surrounds the outer contour of the planetary gear 1 near the planet wheel 1.
Das Gehäuse 3 ist aus zwei Halbschalen 7, 8 zusammengesetzt, nämlich aus zwei baugleichen, tiefgezogenen, topfförmigen Blechschalen, die spiegelsymmetrisch zusammengesetzt sind. The housing 3 is composed of two half shells 7, 8, namely two identical, deep-drawn, cup-shaped sheet metal shells, which are composed in mirror symmetry.
Die zwei Halbschalen 7, 8 sind entlang einer gewellten Ringfläche 9, die durch die kreisbogenförmigen Ausbuchtungen 6 gebildet wird, gefügt und an acht Kreisflächen 10, an welchen sich die jeweils zwei zylindrischen Ausformungen 5 berühren. Die Fügeflächen 9, 10 stehen normal auf alle Drehachsen 4. Zwischen dem Gehäuse 3 und den Ausgangswellen sind -nicht dargestellte- öldichte Abdichtungen vorgesehen. Die einzigen beiden Öffnungen des Gehäuses 3 sind jene für die beiden Ausgangswellen. The two half-shells 7, 8 are joined along a corrugated annular surface 9, which is formed by the circular arc-shaped bulges 6, and at eight circular surfaces 10, to which the two cylindrical formations 5 touch. The joining surfaces 9, 10 are normal to all axes of rotation. 4 Between the housing 3 and the output shafts - not shown - oil-tight seals are provided. The only two openings of the housing 3 are those for the two output shafts.
Jedes Umlaufrad 1 ist mit drei Zahneingriffen antriebsverbunden: ein Eingriff mit einem Ausgangsstirnrad 2 und je ein Eingriff mit jedem der zwei benachbarten Umlaufräder 1. Die Anzahl der Umlaufräder 1 ist acht. Die geometrischen Eingriffsbedingungen durch die drei Zahneingriffe be- dingen eine starke Einschränkung in der Wahl der Zähnezahlen. Each planetary gear 1 is drivingly connected to three meshing engagements: one engagement with one output spur gear 2 and one engagement with each of the two adjacent epicyclic gears 1. The number of planetary gears 1 is eight. The geometric engagement conditions caused by the three tooth engagements severely limit the choice of teeth numbers.
Die Umlaufräder 1 weisen jeweils 10 Zähne auf, die Ausgangsstirnräder 2 weisen jeweils 16 Zähne auf. Das Verhältnis der Zähnezahl eines Ausgangsstirnrades 2 zur Zähnezahl eines Umlaufrades 1 ist 1 ,6. Die Verdop- pelung der Zähnezahlen von Umlaufrädern 1 und Ausgangsstirnrädern 2 erfüllt ebenfalls die Einbaubedingungen. Eines der Ausgangsstirnräder 2 ist über vier Zahneingriffe mit vier Umlaufrädern 1 antriebsverbunden. Diese vier Umlaufräder 1 sind über acht Zahneingriffe mit im Umlaufsinn um 45 Grad versetzt angeordneten weiteren vier Umlaufrädern 1 antriebs- verbunden, welche wiederum über vier Zahneingriffe mit dem anderen Ausgangsstirnrad 2 antriebsverbunden sind. The planetary gears 1 each have 10 teeth, the output spur gears 2 each have 16 teeth. The ratio of the number of teeth of a Ausgangsstirnrades 2 to the number of teeth of a planetary gear 1 is 1, 6. The doubling of the numbers of teeth of planet wheels 1 and output spur gears 2 also fulfills the installation conditions. One of the output spur gears 2 is drive-connected via four gear meshes with four epicyclic gears 1. These four epicyclic wheels 1 are drivingly connected via eight tooth engagements with a further four epicyclic wheels 1 arranged in the direction of rotation by 45 degrees, which in turn are drive-connected to the other output spur gear 2 via four tooth engagements.
Die radiale Positionierung der Ausgangsstirnräder 2 erfolgt über die Kontaktflächen zu den Umlaufrädern 1 (Fig. 2), die axiale Positionierung über eine Kreisringfläche zur Halbschale 7,8 und in der Symmetrieebene des Gehäuses 3 über eine Kreisringfläche zum jeweils anderen Ausgangstirnrad 2 (Fig. 1). The radial positioning of the output spur gears 2 takes place via the contact surfaces to the revolving wheels 1 (FIG. 2), the axial positioning via an annular surface to the half shell 7, 8 and in the plane of symmetry of the housing 3 via an annular surface to the respective other output spur gear 2 (FIG ).
In Fig. 3 ist ein Detailausschnitt aus Fig. 2 dargestellt, in welchem der Bereich des Eingriffs zwischen einem Umlaufrad 1 und einem Ausgangs- Stirnrad 2 gut zu sehen ist. Die Eingriffsverzahnungen der Umlaufräder 1 und der Ausgangsstirnräder 2 weisen im Zahnfußbereich eine optimierte Formgebung auf. Die Eingriffsevolvente ist im Fußbereich nachgeformt. Dies führt zu einer Stärkung der Verzahnung in diesem Bereich und zu einem kraftschlüssigen Rollkontakt durch die zylindrischen Kontaktflä- chen von Kopfbereich und Fußbereich, jedes der im Eingriff stehenden Stirnräder. FIG. 3 shows a detail of FIG. 2, in which the region of engagement between a planetary gear 1 and a starting gear 1 is shown. Helical 2 is easy to see. The meshing gears of the planetary gears 1 and the output spur gears 2 have an optimized shape in the root of the tooth. The engaging involute is reshaped in the foot area. This leads to a strengthening of the toothing in this area and to a frictional rolling contact through the cylindrical contact surfaces of the head area and foot area, each of the meshing spur gears.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Umlaufrad 1 planet wheel
2 Ausgangsstirnrad 2 output spur gear
3 Gehäuse  3 housing
4 Drehachse  4 rotation axis
5 Ausformung des Gehäuses 5 Formation of the housing
6 Ausbuchtung 6 bulge
7 Halbschale 7 half shell
8 Halbschale  8 half shell
9 gewellte Ringfläche  9 wavy ring surface
10 Kreisfläche  10 circular area

Claims

Patentansprüche Ausgleichsgetriebe umfassend miteinander kämmende Umlaufräder Patent claims Differential gear comprising meshing epicyclic gears
(1) und zwei zentrale Ausgangsstirnräder (2) zweier Ausgangswellen, wobei die Umlaufräder (1) jeweils mit einem der Ausgangsstirnräder(1) and two central output spur gears (2) of two output shafts, the epicyclic gears (1) each with one of the output spur gears
(2) kämmen, wobei die Umlaufräder (1) und die Ausgangsstirnräder (2) in einem Gehäuse (3) angeordnet sind, (2) mesh, the peripheral gears (1) and the output spur gears (2) being arranged in a housing (3),
d a d u r c h g e k e n n z e i c h n e t , dass das Gehäuse (3) selbst zur Lagerung der Umlaufräder (1) ausgebildet ist und die Umlaufräder (1) direkt am Gehäuse (3) gelagert sind. This means that the housing (3) itself is designed to support the circulating wheels (1) and the circulating wheels (1) are mounted directly on the housing (3).
Ausgleichsgetriebe nach Anspruch 1 , Differential gear according to claim 1,
d a d u r c h g e k e n n z e i c h n e t , dass die Umlaufräder (1) als außenverzahnte Hohlräder, mit Hohlräumen um die jeweiligen Drehachsen (4) der Umlaufräder, ausgebildet sind und Ausformungen (5) des Gehäuses (3) jeweils in die Hohlräume der Umlaufräder (1) reichen, so dass die Umlaufräder (1) direkt auf den Ausformungen (5) des Gehäuses (3) gelagert sind. This means that the planetary gears (1) are designed as externally toothed ring gears, with cavities around the respective axes of rotation (4) of the planetary gears, and formations (5) of the housing (3) each extend into the cavities of the planetary gears (1), so that the Circulating wheels (1) are mounted directly on the formations (5) of the housing (3).
Ausgleichsgetriebe nach Anspruch 2, Differential gear according to claim 2,
d a d u r c h g e k e n n z e i c h n e t , dass die Ausformungen (5) des Gehäuses zylindrische Ausformungen (5) sind, bevorzugt an jedem Umlaufrad (1) jeweils zwei zylindrische Ausformungen (5) die axial von beiden Seiten in die Hohlräume reichen. This means that the formations (5) of the housing are cylindrical formations (5), preferably two cylindrical formations (5) on each circulating wheel (1), which extend axially from both sides into the cavities.
Ausgleichsgetriebe nach zumindest einem der vorhergehenden Ansprüche, Differential gear according to at least one of the preceding claims,
d a d u r c h g e k e n n z e i c h n e t , dass das Gehäuse (3) an der Außenseite für jedes Umlaufrad (1) eine kreisbo- genförmige Ausbuchtung (6) aufweist, wobei die Ausbuchtung (6) jeweils die Außenkontur des Umlaufrades (1) nahe umgreift. characterized in that the housing (3) has a circular shape on the outside for each planetary wheel (1). gene-shaped bulge (6), the bulge (6) closely surrounding the outer contour of the circulating wheel (1).
Ausgleichsgetriebe nach zumindest einem der vorhergehenden Ansprüche, Differential gear according to at least one of the preceding claims,
d a d u r c h g e k e n n z e i c h n e t , dass das Gehäuse (3) aus zwei Halbschalen (7, 8) zusammengesetzt ist. This means that the housing (3) is composed of two half-shells (7, 8).
Ausgleichsgetriebe nach Anspruch 5, Differential gear according to claim 5,
d a d u r c h g e k e n n z e i c h n e t , dass die zwei Halbschalen (7, This means that the two half-shells (7,
8) entlang einer gewellten Ringfläche (9), die durch die kreisbogenförmigen Ausbuchtungen (6) gebildet wird, gefügt sind und/ oder an Kreisflächen (10), an welchen sich die jeweils zwei zylindrischen Ausformungen (5) berühren, gefügt sind, wobei die Fügeflächen (9, 10) bevorzugt normal auf alle Drehachsen (4) stehen. 8) are joined along a corrugated annular surface (9), which is formed by the circular arc-shaped bulges (6), and/or are joined to circular surfaces (10), on which the two cylindrical formations (5) touch each other, the Joining surfaces (9, 10) are preferably normal to all axes of rotation (4).
Ausgleichsgetriebe nach Anspruch 5 oder 6, Differential gear according to claim 5 or 6,
d a d u r c h g e k e n n z e i c h n e t , dass die Fügeflächen (9, 10) des Gehäuses (3) öldicht gefügt sind, bevorzugt geschweißt, insbesondere durch Kondensator-Entladungsschweißen. This means that the joining surfaces (9, 10) of the housing (3) are joined in an oil-tight manner, preferably welded, in particular by capacitor discharge welding.
Ausgleichsgetriebe nach zumindest einem der vorhergehenden Ansprüche, Differential gear according to at least one of the preceding claims,
d a d u r c h g e k e n n z e i c h n e t , dass das Gehäuse (3) aus zumindest einem, bevorzugt zwei, Blechumformteilen besteht, insbesondere aus zwei baugleichen, tiefgezogenen, topfför- migen Blechschalen. This means that the housing (3) consists of at least one, preferably two, formed sheet metal parts, in particular two identical, deep-drawn, cup-shaped sheet metal shells.
9. Ausgleichsgetriebe nach zumindest einem der vorhergehenden An- d a d u r c h g e k e n n z e i c h n e t , dass zwischen dem Gehäuse (3) und den Ausgangswellen öldichte Abdichtungen vorgesehen sind. 9. Differential gear according to at least one of the previous instructions characterized in that oil-tight seals are provided between the housing (3) and the output shafts.
PCT/EP2015/071585 2014-10-10 2015-09-21 Differential WO2016055255A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11448300B1 (en) * 2021-06-15 2022-09-20 Schaeffler Technologies AG & Co. KG Sealed planetary differential

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US3406593A (en) * 1966-09-15 1968-10-22 Illinois Tool Works Limited slip differential mechanism
US3738192A (en) * 1971-06-29 1973-06-12 Illinois Tool Works Limited slip differential mechanisms
WO2014019744A1 (en) * 2012-07-31 2014-02-06 Schaeffler Technologies AG & Co. KG Spur gear differential

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Publication number Priority date Publication date Assignee Title
US3292456A (en) 1964-04-30 1966-12-20 Illinois Tool Works Spin limiting differential
DE102012214767A1 (en) 2012-08-20 2014-02-20 Schaeffler Technologies AG & Co. KG Differential gear for dividing input torque applied on wheels of commercial vehicle, has planet carrier that revolves around differential axle, and made of metal sheet portion provided with sheet material having multilayer structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406593A (en) * 1966-09-15 1968-10-22 Illinois Tool Works Limited slip differential mechanism
US3738192A (en) * 1971-06-29 1973-06-12 Illinois Tool Works Limited slip differential mechanisms
WO2014019744A1 (en) * 2012-07-31 2014-02-06 Schaeffler Technologies AG & Co. KG Spur gear differential

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11448300B1 (en) * 2021-06-15 2022-09-20 Schaeffler Technologies AG & Co. KG Sealed planetary differential

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