DE102008034242A1 - Traction drive for drive machine, particularly ground conveyor, has combustion engine and hydrostatic drive, where electric motor is provided in mechanical drive connection, and electrical engine is connected to electrical energy storage - Google Patents

Traction drive for drive machine, particularly ground conveyor, has combustion engine and hydrostatic drive, where electric motor is provided in mechanical drive connection, and electrical engine is connected to electrical energy storage Download PDF

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DE102008034242A1
DE102008034242A1 DE102008034242A DE102008034242A DE102008034242A1 DE 102008034242 A1 DE102008034242 A1 DE 102008034242A1 DE 102008034242 A DE102008034242 A DE 102008034242A DE 102008034242 A DE102008034242 A DE 102008034242A DE 102008034242 A1 DE102008034242 A1 DE 102008034242A1
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drive
hydrostatic
electric motor
combustion engine
electrical
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German (de)
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Bernhard Götz
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Linde Material Handling GmbH
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Linde Material Handling GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/36—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
    • B60K6/54—Transmission for changing ratio
    • B60K6/543—Transmission for changing ratio the transmission being a continuously variable transmission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/10—Road Vehicles
    • B60Y2200/15—Fork lift trucks, Industrial trucks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Abstract

The traction drive has a combustion engine (1), a hydrostatic drive (3) and a drive axis (2) with a differential drive (2a). An electric motor (7) is provided in a mechanical drive connection, where the electrical engine is connected to electrical energy storage (8). The electrical engine is arranged parallel to the drive axis, where a switching decoupler (9) is arranged between the hydrostatic drive and the differential drive.

Description

Die Erfindung betrifft einen Fahrantrieb einer Arbeitsmaschine, insbesondere Flurförderzeug, mit einem Verbrennungsmotor, einem davon angetriebenen hydrostatischen Getriebe und einer ausgangsseitigen, mit einem Differentialgetriebe versehenen Antriebsachse.The The invention relates to a traction drive of a work machine, in particular Industrial truck, with an internal combustion engine, one of them driven hydrostatic transmission and an output side, provided with a differential gear drive axle.

Ein gattungsgemäßer Fahrantrieb ist in der DE 10 2006 022 203 A1 offenbart. Bei diesem Fahrantrieb wird beim Abbremsen der Arbeitsmaschine Bremsenergie in Ölwärme umgewandelt und über einen Ölkühler des hydrostatischen Getriebes an die Umgebung abgegeben. Diese Energie geht somit als Nutzenergie verloren.A generic drive is in the DE 10 2006 022 203 A1 disclosed. In this traction drive braking energy is converted into oil heat when braking the work machine and discharged through an oil cooler of the hydrostatic transmission to the environment. This energy is thus lost as useful energy.

In der genannten Druckschrift ist ferner ein Fahrantrieb offenbart, bei dem ein elektrisches Getriebe vorgesehen ist. Dabei ergibt sich die Möglichkeit der Energierückgewinnung beim Bremsen. Hierbei wird der Elektromotor des elektrischen Getriebes generatorisch betrieben und die beim Bremsen aus der kinetischen Energie der Arbeitsmaschine erzeugte elektrische Energie in einen elektrischen Energiespeicher (z. B. eine aufladbare Batterie) eingespeist. Beim erneuten Anfahren und Beschleunigen der Arbeitsmaschine kann die im Energiespeicher vorhandene Energie genutzt werden, um den vom Verbrennungsmotor zu erzeugenden Leistungsanteil zu verringern.In the cited document further discloses a traction drive, in which an electrical transmission is provided. This results the possibility of energy recovery during Brakes. In this case, the electric motor of the electric transmission is regenerative operated and when braking from the kinetic energy of the working machine generated electrical energy in an electrical energy storage (eg a rechargeable battery). When starting again and accelerating the work machine can be in the energy store Existing energy can be used by the internal combustion engine to reduce the amount of power to be generated.

Aus der DE 196 49 597 A1 ist es bereits bekannt, einen Fahrantrieb, der ein hydrostatisches Getriebe aufweist, mit einem Druckmittelspeicher zu versehen, der beim Abbremsen der Arbeitsmaschine gefüllt und beim Beschleunigen und Fahren wieder geleert wird. Derartige Fahrantriebe, die zusätzliche Ventile im hydraulischen Kreis erfordern, sind steuerungstechnisch jedoch relativ aufwendig.From the DE 196 49 597 A1 It is already known to provide a traction drive, which has a hydrostatic transmission, with a pressure fluid accumulator, which is filled during braking of the working machine and emptied when accelerating and driving again. Such traction drives, which require additional valves in the hydraulic circuit, are control technology but relatively expensive.

Der vorliegenden Erfindung liegt daher die Aufgabe zu Grunde, einen Fahrantrieb der eingangs genannten Art zur Verfügung zu stellen, der mit geringem Aufwand eine effiziente Energierückgewinnung beim Bremsen ermöglicht.Of the The present invention is therefore based on the object, a Travel drive of the type mentioned above available provide efficient energy recovery at low cost Brakes possible.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass ein Elektromotor, der an einen elektrischen Energiespeicher angeschlossen ist, in mechanischer Antriebsverbindung mit dem Differentialgetriebe steht.These The object is achieved according to the invention that an electric motor attached to an electrical energy storage is connected, in mechanical drive connection with the differential gear stands.

Der erfindungswesentliche Gedanke besteht demnach darin, bei einen Fahrantrieb, der ein hydrostatisches Getriebe aufweist, zur Rückgewinnung von Bremsenergie anstelle eines hydraulischen Druckspeichers einen elektrischen Energiespeicher und einen damit in Wirkverbindung stehenden Elektromotor einzusetzen.Of the Thought essential to the invention is therefore, in a traction drive, having a hydrostatic transmission, for the recovery of Brake energy instead of a hydraulic accumulator an electric Energy storage and a standing in operative connection electric motor use.

Der Elektromotor wird beim Bremsen generatorisch betrieben. Die dabei aus der kinetischen Energie der Arbeitsmaschine erzeugte elektrische Energie wird in den elektrischen Energiespeicher eingespeist. Beim Beschleunigen der Arbeitsmaschine kann daher der Elektromotor den Verbrennungsmotor unterstützen. Insbesondere bei Arbeitsmaschinen, die normalerweise durch sogenanntes „Reversieren” also mittels des als Betriebsbremse zugelassenen hydrostatischen Getriebes abgebremst werden, können dabei erhebliche Treibstoffeinsparungen erzielt werden.Of the Electric motor is operated as a generator during braking. The case electrical energy generated from the kinetic energy of the work machine is fed into the electrical energy storage. When accelerating The working machine can therefore be the electric motor of the internal combustion engine support. Especially at work machines that normally by so-called "reversing" so by means of braked as service brake approved hydrostatic transmission At the same time, you can save a lot of fuel be achieved.

Da erfindungsgemäß der Elektromotor nicht mit dem hydrostatischen Getriebe des Fahrantriebs sondern mit dem Differentialgetriebe der Antriebsachse in mechanischer Antriebsverbindung steht, liegen nur wenige Antriebselemente im Kraftfluss zwischen dem Elektromotor und den Antriebsrädern der Antriebsachse. Die mechanischen Verluste sind dementsprechend sowohl bei der Rückgewinnung von Bremsenergie als auch bei der Wiedereinspeisung in den Antriebsstrang gering, was sich günstig auf den Wirkungsgrad auswirkt.There According to the invention, the electric motor with the hydrostatic transmission of the drive but with the differential gear the drive axle is in mechanical drive connection lie only a few drive elements in the power flow between the electric motor and the drive wheels of the drive axle. The mechanical Losses are accordingly both in the recovery of Braking energy as well as when re-feeding into the drive train low, which has a favorable effect on the efficiency.

Durch die Erfindung ist es möglich, sowohl den Verbrennungsmotor als auch das hydrostatische Getriebe je nach Leistung des Elektromotors auf die Erzeugung bzw. Übertragung einer geringeren Leistung auszulegen, also kleiner auszuführen.By The invention makes it possible to both the internal combustion engine as well as the hydrostatic transmission depending on the power of the electric motor on the generation or transmission of lower power interpreted, so run smaller.

Sofern der Elektromotor parallel zur Antriebsachse angeordnet ist, kann die mechanische Antriebsverbindung des Elektromotors zum Eingang des Differentialgetriebes in Form einer Stirnradstufe ausgebildet sein. Dabei sind die mechanischen Verluste geringer als bei einer Krafteinleitung über ein Kegelradgetriebe, das bei einer zur Antriebsachse rechtwinkligen Anordnung des Elektromotors erforderlich wäre.Provided the electric motor is arranged parallel to the drive axle can the mechanical drive connection of the electric motor to the input of Differential gear may be formed in the form of a spur gear. The mechanical losses are lower than with a force on a bevel gear, which is perpendicular to the drive axis Arrangement of the electric motor would be required.

Es erweist sich als günstig, wenn eine schaltbare Trennkupplung zwischen dem hydrostatischen Getriebe und dem Differentialgetriebe angeordnet ist. Dadurch kann sowohl der Verbrennungsmotor als auch das hydrostatische Getriebe von der Antriebsachse abgetrennt und stillgesetzt werden und es ist ein rein elektrischer Antrieb der Arbeitsmaschine mittels des durch den elektrischen Energiespeicher gespeisten Elektromotors möglich.It proves to be favorable when a switchable disconnect clutch between the hydrostatic transmission and the differential gear is arranged. This allows both the internal combustion engine as well the hydrostatic transmission is separated from the drive axle and be shut down and it is a purely electric drive the Working machine by means of the electrical energy storage powered electric motor possible.

Gemäß einer vorteilhaften Ausgestaltung der Erfindung ist das hydrostatische Getriebe als hydrostatisches Kompaktgetriebe ausgebildet. Hierbei sind die wesentlichen Elemente des hydrostatischen Getriebes, nämlich die Hydropumpe und der Hydromotor zu einer Baueinheit räumlich zusammengefasst.According to one advantageous embodiment of the invention is the hydrostatic Gear designed as a hydrostatic compact transmission. in this connection are the essential elements of the hydrostatic transmission, namely the hydraulic pump and the hydraulic motor to form a unit spatially summarized.

Sofern das hydrostatische Kompaktgetriebe einen als Langsamläufer ausgebildeten Hydromotor aufweist, benötigt die nachgeschaltete Antriebsachse kein Untersetzungsgetriebe.If the hydrostatic compact transmission designed as a slow-speed hydraulic motor has, the downstream drive axle requires no reduction gear.

In Weiterbildung der Erfindung ist der Hydromotor des hydrostatischen Kompaktgetriebes parallel zur Hydropumpe angeordnet, was die Möglichkeit eröffnet, einen Durchtrieb vom Verbrennungsmotor über die Hydropumpe zu einem zusätzlich antreibbaren Aggregat, beispielsweise einer Hilfspumpe, zu schaffen.In Further development of the invention is the hydraulic motor of the hydrostatic Compact gear arranged parallel to the hydraulic pump, which opens up the possibility a drive through the internal combustion engine via the hydraulic pump to an additional drivable aggregate, for example an auxiliary pump to create.

Eine andere, ebenfalls vorteilhafte Bauweise kann dadurch erzielt werden, dass der Hydromotor des hydrostatischen Kompaktgetriebes an die Hydropumpe koaxial anschließend angeordnet ist. Es ergibt sich dabei eine schlanke und platzsparende Inline-Bauweise.A other, likewise advantageous construction can be achieved by that the hydraulic motor of the hydrostatic compact transmission to the Hydro pump coaxial is then arranged. It results a slim and space-saving in-line construction.

Weitere Vorteile und Einzelheiten der Erfindung werden anhand des in der schematischen Figur dargestellten Ausführungsbeispieles näher erläutert. Diese zeigt einen Prinzipaufbau eines erfindungsgemäßen Fahrantriebs.Further Advantages and details of the invention will be apparent from the in the schematic figure illustrated embodiment explained in more detail. This shows a basic structure a traction drive according to the invention.

Der erfindungsgemäße Fahrantrieb ist für eine Arbeitsmaschine, insbesondere ein Flurförderzeug (bevorzugt Gegengewichts-Gabelstapler) vorgesehen und verfügt über einen Verbrennungsmotor 1, eine Antriebsachse 2 und ein hydrostatisches Getriebe 3, das zwischen den Verbrennungsmotor 1 und die Antriebsachse 2 geschaltet ist. Die Antriebsachse 2 ist als Differentialachse ausgebildet, weist also eingangsseitig ein Differentialgetriebe 2a auf, und treibt ausgangsseitig zwei Räder 4a, 4b an.The traction drive according to the invention is provided for a work machine, in particular an industrial truck (preferably counterweight forklift) and has an internal combustion engine 1 , a drive axle 2 and a hydrostatic transmission 3 that is between the internal combustion engine 1 and the drive axle 2 is switched. The drive axle 2 is designed as a differential axis, thus has on the input side a differential gear 2a on, and drives on the output side two wheels 4a . 4b at.

Das hydrostatische Getriebe 3 ist als hydrostatisches Kompaktgetriebe ausgebildet, das über eine mit dem Verbrennungsmotor 1 gekoppelte Hydropumpe 5 verfügt, deren hydraulisches Fördervolumen verstellbar ist und die hydraulisch (beispielsweise im geschlossenen Kreis) an einen Hydromotor 6 angeschlossen ist, dessen Schluckvolumen konstant oder verstellbar sein kann. Ein derartiges hydrostatisches Kompaktgetriebe, in das auch die zur Steuerung erforderlichen Ventile integriert sein können, ist mit einem maximalen Betriebsdruck von mehr als 400 bar betreibbar, wodurch sich eine hohe Leistungsdichte erzielen lässt.The hydrostatic transmission 3 is designed as a hydrostatic compact transmission, the one with the internal combustion engine 1 coupled hydraulic pump 5 has, whose hydraulic delivery volume is adjustable and the hydraulic (for example, in a closed circuit) to a hydraulic motor 6 is connected, the sip volume can be constant or adjustable. Such a compact hydrostatic transmission, in which also the valves required for the control can be integrated, can be operated with a maximum operating pressure of more than 400 bar, whereby a high power density can be achieved.

Bei dem Fahrantrieb gemäß dem vorliegenden Ausführungsbeispiel ist der Hydromotor 6 parallel zur Hydropumpe 5 angeordnet. Dadurch ist an der Hydropumpe 5 ein Durchtrieb möglich, so dass vom Verbrennungsmotor 1 über eine Antriebswelle der Hydropumpe 5 auch eine hydraulische Hilfspumpe einer Arbeits- und/oder Lenkhydraulik der Arbeitsmaschine angetrieben werden kann (in der Figur nicht dargestellt). Selbstverständlich ist auch eine sogenannte Inline-Anordnung der Hydropumpe 5 und des Hydromotors 6 möglich, bei der diese Komponenten koaxial hintereinander angeordnet sind. Die Durchtriebsmöglichkeit zur Hilfspumpe entfällt dann. Die Hilfspumpe wird daher in diesem Fall auf andere geeignete Weise angetrieben und ist beispielsweise parallel zum Kompaktgetriebe angeordnet.In the traction drive according to the present embodiment, the hydraulic motor 6 parallel to the hydraulic pump 5 arranged. This is due to the hydraulic pump 5 a through drive possible, so that the internal combustion engine 1 via a drive shaft of the hydraulic pump 5 Also, a hydraulic auxiliary pump working and / or steering hydraulics of the working machine can be driven (not shown in the figure). Of course, a so-called inline arrangement of the hydraulic pump 5 and the hydraulic motor 6 possible, in which these components are arranged coaxially one behind the other. The Durchtriebsmöglichkeit to the auxiliary pump is then eliminated. The auxiliary pump is therefore driven in this case in other suitable manner and is arranged for example parallel to the compact gear.

Erfindungsgemäß steht ein Elektromotor 7 in mechanischer Antriebsverbindung mit dem Differentialgetriebe 2a. Hierbei ist der Elektromotor 7 bevorzugt parallel zur Antriebsachse 2 angeordnet, wodurch der Antrieb des Differentialgetriebes mittels einer Stirnradstufe erfolgen kann. Auch eine andere als die in der Figur gezeigte Anbaulage des Elektromotors 7 an das Differentialgetriebe 2a ist möglich.According to the invention is an electric motor 7 in mechanical drive connection with the differential gear 2a , Here is the electric motor 7 preferably parallel to the drive axle 2 arranged, whereby the drive of the differential gear can be done by means of a spur gear. Also, other than the mounting position of the electric motor shown in the figure 7 to the differential gear 2a is possible.

Der Elektromotor 7 ist mittels einer elektrischen Leitung L an einen elektrischen Energiespeicher 8 angeschlossen, beispielsweise eine aufladbare Batterie, so dass Bewegungsenergie der Arbeitsmaschine beim Bremsen oder bei Bergabfahrt zurückgewonnen und im Energiespeicher 8 gespeichert werden kann. Diese Energie steht dann zum Beschleunigen der Arbeitsmaschine wieder zur Verfügung und wird durch den Elektromotor 7 in das Differentialgetriebe 2a der Antriebsachse 2 eingespeist.The electric motor 7 is by means of an electrical line L to an electrical energy storage 8th connected, for example, a rechargeable battery, so that kinetic energy of the working machine recovered during braking or downhill and energy storage 8th can be stored. This energy is then available for accelerating the work machine again and is by the electric motor 7 in the differential gear 2a the drive axle 2 fed.

Selbstverständlich ist bei geladener Batterie auch ein Betrieb mit abgeschaltetem Verbrennungsmotor 1 möglich. Hierbei wird zweckmäßigerweise eine zwischen dem Ausgang des hydrostatischen Getriebes 3 und dem Differentialgetriebe 2a angeordnete, schaltbare Trennkupplung 9 geöffnet, so dass nicht nur der Verbrennungsmotor 1 sondern auch das hydrostatische Getriebe 3 von der Antriebsachse 2 getrennt ist.Of course, when the battery is charged, an operation with the internal combustion engine switched off 1 possible. This is expediently one between the output of the hydrostatic transmission 3 and the differential gear 2a arranged, switchable disconnect clutch 9 open, so not only the internal combustion engine 1 but also the hydrostatic transmission 3 from the drive axle 2 is disconnected.

Für spezielle Einsätze ist es möglich, den elektrischen Energiespeicher 8 zusätzlich durch eine externe Energiequelle aufzuladen. Ferner kann eine vergrößerte oder eine zweite Batterie zum Einsatz kommen.For special applications, it is possible to use the electrical energy storage 8th additionally charged by an external source of energy. Furthermore, an enlarged or a second battery can be used.

ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • - DE 102006022203 A1 [0002] - DE 102006022203 A1 [0002]
  • - DE 19649597 A1 [0004] - DE 19649597 A1 [0004]

Claims (7)

Fahrantrieb einer Arbeitsmaschine, insbesondere Flurförderzeug, mit einem Verbrennungsmotor (1), einem davon angetriebenen hydrostatischen Getriebe (3) und einer ausgangsseitigen, mit einem Differentialgetriebe (2a) versehenen Antriebsachse (2), dadurch gekennzeichnet, dass ein Elektromotor (7), der an einen elektrischen Energiespeicher (8) angeschlossen ist, in mechanischer Antriebsverbindung mit dem Differentialgetriebe (2a) steht.Traction drive of a working machine, in particular industrial truck, with an internal combustion engine ( 1 ), a driven hydrostatic transmission ( 3 ) and an output side, with a differential gear ( 2a ) provided drive axle ( 2 ), characterized in that an electric motor ( 7 ) connected to an electrical energy store ( 8th ) in mechanical drive connection with the differential gear ( 2a ) stands. Fahrantrieb nach Anspruch 1, dadurch gekennzeichnet, dass der Elektromotor (7) parallel zur Antriebsachse (2) angeordnet ist.Travel drive according to claim 1, characterized in that the electric motor ( 7 ) parallel to the drive axle ( 2 ) is arranged. Fahrantrieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass eine schaltbare Trennkupplung (9) zwischen dem hydrostatischen Getriebe (3) und dem Differentialgetriebe (3) angeordnet ist.Traction drive according to claim 1 or 2, characterized in that a switchable separating clutch ( 9 ) between the hydrostatic transmission ( 3 ) and the differential gear ( 3 ) is arranged. Fahrantrieb nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das hydrostatische Getriebe (3) als hydrostatisches Kompaktgetriebe ausgebildet istTraction drive according to one of claims 1 to 3, characterized in that the hydrostatic transmission ( 3 ) is designed as a hydrostatic compact transmission Flurförderzeug nach Anspruch 4, dadurch gekennzeichnet, dass das hydrostatische Kompaktgetriebe einen als Langsamläufer ausgebildeten Hydromotor (6) aufweist.Truck according to claim 4, characterized in that the hydrostatic compact gear designed as a slow-speed hydraulic motor ( 6 ) having. Flurförderzeug nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass der Hydromotor (6) des hydrostatischen Kompaktgetriebes parallel zur Hydropumpe (5) angeordnet ist.Truck according to claim 4 or 5, characterized in that the hydraulic motor ( 6 ) of the hydrostatic compact gear parallel to the hydraulic pump ( 5 ) is arranged. Flurförderzeug nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass der Hydromotor (6) des hydrostatischen Kompaktgetriebes an die Hydropumpe (5) koaxial anschließend angeordnet ist.Truck according to claim 4 or 5, characterized in that the hydraulic motor ( 6 ) of the hydrostatic compact gearbox to the hydraulic pump ( 5 ) is arranged coaxially afterwards.
DE102008034242A 2008-07-23 2008-07-23 Traction drive for drive machine, particularly ground conveyor, has combustion engine and hydrostatic drive, where electric motor is provided in mechanical drive connection, and electrical engine is connected to electrical energy storage Withdrawn DE102008034242A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102008034242A DE102008034242A1 (en) 2008-07-23 2008-07-23 Traction drive for drive machine, particularly ground conveyor, has combustion engine and hydrostatic drive, where electric motor is provided in mechanical drive connection, and electrical engine is connected to electrical energy storage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008034242A DE102008034242A1 (en) 2008-07-23 2008-07-23 Traction drive for drive machine, particularly ground conveyor, has combustion engine and hydrostatic drive, where electric motor is provided in mechanical drive connection, and electrical engine is connected to electrical energy storage

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DE102008034242A1 true DE102008034242A1 (en) 2010-01-28

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DE102008034242A Withdrawn DE102008034242A1 (en) 2008-07-23 2008-07-23 Traction drive for drive machine, particularly ground conveyor, has combustion engine and hydrostatic drive, where electric motor is provided in mechanical drive connection, and electrical engine is connected to electrical energy storage

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112011100878B4 (en) * 2010-08-31 2013-10-31 Komatsu Ltd. fork-lift truck
WO2015043743A1 (en) * 2013-09-25 2015-04-02 Liebherr-Components Biberach Gmbh Working machine, in particular a dumper truck or truck, having an electric drive
DE102016004245A1 (en) * 2016-04-08 2017-10-12 Liebherr-Werk Bischofshofen Gmbh Travel drive for a work machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19649597A1 (en) 1996-11-29 1998-06-04 Linde Ag Operating method for motor vehicle with hydrostatic propulsion
DE102006022203A1 (en) 2006-05-12 2007-11-15 Linde Material Handling Gmbh Travel drive of a work machine with replaceable transmission module

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19649597A1 (en) 1996-11-29 1998-06-04 Linde Ag Operating method for motor vehicle with hydrostatic propulsion
DE102006022203A1 (en) 2006-05-12 2007-11-15 Linde Material Handling Gmbh Travel drive of a work machine with replaceable transmission module

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112011100878B4 (en) * 2010-08-31 2013-10-31 Komatsu Ltd. fork-lift truck
US8573349B2 (en) 2010-08-31 2013-11-05 Komatsu Ltd. Forklift
WO2015043743A1 (en) * 2013-09-25 2015-04-02 Liebherr-Components Biberach Gmbh Working machine, in particular a dumper truck or truck, having an electric drive
US9776496B2 (en) 2013-09-25 2017-10-03 Liebherr-Components Biberach Gmbh Work machine, in particular dump truck or truck, having an electric drive
DE102016004245A1 (en) * 2016-04-08 2017-10-12 Liebherr-Werk Bischofshofen Gmbh Travel drive for a work machine

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