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WO2020035238A1 - Transmission à branchement de puissance - Google Patents

Transmission à branchement de puissance Download PDF

Info

Publication number
WO2020035238A1
WO2020035238A1 PCT/EP2019/068930 EP2019068930W WO2020035238A1 WO 2020035238 A1 WO2020035238 A1 WO 2020035238A1 EP 2019068930 W EP2019068930 W EP 2019068930W WO 2020035238 A1 WO2020035238 A1 WO 2020035238A1
Authority
WO
WIPO (PCT)
Prior art keywords
input shaft
spur gear
power split
split transmission
variator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2019/068930
Other languages
German (de)
English (en)
Inventor
Philipp Rechenbach
Benedikt Reick
Raphael Himmelsbach
Giuseppe Muro
Felix GÖTZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of WO2020035238A1 publication Critical patent/WO2020035238A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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 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 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 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
    • B60K6/365—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 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 with the gears having orbital motion
    • 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
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • 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
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing
    • B60K17/12—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing of electric gearing
    • 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
    • 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 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 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/44—Series-parallel type
    • B60K6/445—Differential gearing distribution 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
    • 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 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
    • B60K6/547—Transmission for changing ratio the transmission being a stepped gearing
    • 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
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/28—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or type of power take-off
    • 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
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/001—Arrangement or mounting of electrical propulsion units one motor mounted on a propulsion axle for rotating right and left wheels of this axle
    • 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
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/04—Combinations of toothed gearings only
    • F16H2037/049—Forward-reverse units with forward and reverse gears for achieving multiple forward and reverse gears, e.g. for working machines
    • 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

Definitions

  • the invention relates to a power split transmission according to the kind defined in the preamble of claim 1.
  • Generic power split transmissions are used in particular for agricultural or municipal utility vehicles.
  • An agricultural utility vehicle of this type is, for example, a tractor.
  • DE 101 28 076 A1 discloses a power split transmission in which an input shaft is passed through the transmission and drives a variator via a spur gear transmission and the input shaft is operatively connected to a power take-off, for example with pumps for the working hydraulics.
  • the drive has several planetary stages and clutches with which travel ranges can be switched, as well as a clutch for forward travel and a clutch for reverse travel, with which the direction of travel can be selected.
  • This type of transmission is also referred to as a primary coupled power split transmission.
  • variator denotes a variator machine in a power split transmission.
  • the present invention has for its object to provide a power-split transmission, by means of which the working hydraulic pumps and the variators can be driven in a simple manner and the transmission can be of modular construction with respect to the variators.
  • the power split transmission has an input shaft which can be connected to a drive motor, for example an internal combustion engine, and which is guided through the entire power split transmission.
  • a drive motor for example an internal combustion engine
  • Several planetary stages are arranged coaxially to this input shaft, which can be controlled with clutches in such a way that several driving ranges are switchable.
  • the couplings are also arranged coaxially to the input shaft.
  • the power split transmission has a clutch for driving forward and a clutch for driving backwards, which is arranged after the planetary stages.
  • a gear wheel is connected to the drive shaft on the end of the input shaft opposite the drive motor.
  • a variator and a power take-off, for example for the working hydraulics and / or the steering pumps, are driven via this gearwheel.
  • the gearwheel which is connected to the input shaft, is operatively connected to a spur gear of a countershaft, the further spur gear of which meshes with the spur gear of the drive shaft of the variator.
  • this spur gear meshes via an idler gear with a spur gear that drives the power take-off shaft.
  • the space next to the planetary stages can be used to arrange the power electronics for the variators, which are designed as electrical machines.
  • the power electronics can be arranged inside the gearbox or outside the gearbox and can be attached to the gearbox.
  • the two variators are designed as electrical machines of almost the same size, as a result of which the variator, which is operatively connected to the planetary stage, can have a lower speed.
  • Fig. 2 shows a power split transmission with the electrical variators between the prime mover and the planetary stages
  • FIG. 4 shows a power split transmission with a variator between the drive machine and the planetary stages and a variator parallel to the input shaft in the region of the planetary stages.
  • a drive machine 1 for example an internal combustion engine or an electric motor, drives an input shaft 3 via a vibration damper 2.
  • the input shaft 3 extends through the entire transmission and drives the gearwheel 4 to which the input shaft 3 is operatively connected.
  • the input shaft 3 can be formed in one piece or in several pieces.
  • the gear 4 of the spur gear 5 drives the spur gear 6.
  • the spur gear 6 is connected to the countershaft 7 and drives the spur gear 8.
  • the spur gear 13, which drives the shaft for the power take-off 14, is driven via the intermediate gear 12.
  • This shaft 14 can be used to drive hydraulic pumps, for example working hydraulics, steering pumps or gear pumps.
  • the drive shaft 10, which drives the variator 11, is connected to the spur gear 9.
  • the variator 11 can be designed as an electrical machine.
  • the variator 11 can be designed as an electrical machine. It However, there is the possibility that the variator 15 is designed as a hydraulic machine. Via the clutches K1, K2, K3 and K4 as well as the brake B, the planetary stage P1, planetary stage P2, planetary stage P3 and planetary stage P4 can be switched so that four driving ranges can be switched. These four driving ranges can be switched in the forward driving direction or reverse driving direction via the directional clutches KV and KR.
  • the variator 11 and the variator 15 are arranged along the input shaft 3 outside the planetary stages P1, P2 and P3.
  • the variator 11 and the variator 15 are preferably not arranged coaxially to one another, but rather are distributed over the circumference of the planetary stages P1, P2 and P3. This makes it possible to design the drive shaft 10 and the drive shaft 16 as a shorter drive shaft.
  • the sun gears of planetary stages P2 and P3 are connected to each other.
  • the parallel wheel of planetary stage P2 and the planet carrier of planetary stage P1 and P3 are connected to each other.
  • the planet gear P1 is connected to the planet carrier P2.
  • the output to the front axle 23 is designed as a spur gear.
  • FIG. 2 differs from the embodiment of FIG. 1 essentially in that the drive shaft 10 is longer and the variator 11 and the variator 15 are arranged between the drive machine 1 and the planetary stage P1 and in that the planetary stage P1, P2, P3 of FIG. 1 have been replaced by a step planetary set and the clutch K3 now couples the planet carrier of the step planetary set to the flute wheel of planetary stage P4, and not, as in FIG. 1, couples the planet carrier of planetary stage P4. Since the variator 11 and the variator 15 can be arranged close to the input shaft 3, one spur gear stage is sufficient to drive the variator 15 up. Furthermore, there is the possibility that the variator 11 and the variator 15 can be arranged in a separate housing. This solution can also be used to create a slim-line power split transmission. Planetary stages P1 and P2 have a common planet carrier on which the step planets are supported. The sun gear of planetary stage P1 is connected to input shaft 3.
  • the structure essentially corresponds to the structure of FIG. 2, the variators 11 and 15 being mounted in a separate gear housing and the drive shaft 10 being made in several pieces. If two electrical variators 11 and 15 of the same size are used, the speed of the variator 11 can be reduced, since the maximum torque of the variator 11 required during operation is smaller than that of the variator 15.
  • FIG. 4 has a variator 15, which is arranged between the drive machine 1 and the planetary stage P1, the variator 11 being arranged outside the planetary stage and thus being parallel in the area of the switching drum 22.
  • the shift drum 22 is shown symbolically for the planetary stages and clutches which the shift drum 22 contains.
  • the working hydraulics should be designed as in Figures 1 to 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention concerne une transmission à branchement de puissance qui comporte un arbre d'entrée (3) qui entraîne par le biais de la roue dentée (4) l'arbre intermédiaire (7) qui est relié fonctionnellement au variateur (11) d'une part et à l'arbre de sortie secondaire (14) d'autre part. Cela permet d'accoupler le variateur (11) et l'arbre de sortie secondaire (14) à l'arbre d'entrée (3) au moyen de peu d'engrenages droits et d'arbres.
PCT/EP2019/068930 2018-08-17 2019-07-15 Transmission à branchement de puissance Ceased WO2020035238A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018213871.0 2018-08-17
DE102018213871.0A DE102018213871A1 (de) 2018-08-17 2018-08-17 Leistungsverzweigungsgetriebe

Publications (1)

Publication Number Publication Date
WO2020035238A1 true WO2020035238A1 (fr) 2020-02-20

Family

ID=67441082

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/068930 Ceased WO2020035238A1 (fr) 2018-08-17 2019-07-15 Transmission à branchement de puissance

Country Status (2)

Country Link
DE (1) DE102018213871A1 (fr)
WO (1) WO2020035238A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230147860A1 (en) * 2020-09-29 2023-05-11 Hitachi Construction Machinery Co., Ltd. Speed-Changing Device
US12325305B2 (en) * 2022-01-19 2025-06-10 Deere & Company Power-split axle drive and agricultural vehicle

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11052747B2 (en) 2018-05-04 2021-07-06 Deere & Company Multi-mode powertrains
US11091018B2 (en) 2018-05-11 2021-08-17 Deere & Company Powertrain with variable vertical drop distance
US11137052B2 (en) 2019-08-29 2021-10-05 Deere & Company Transmission assembly with integrated CVP
US11351983B2 (en) 2019-10-31 2022-06-07 Deere & Company Power control system with transmission transient boost function
DE102020201690B3 (de) 2020-02-11 2021-07-29 Zf Friedrichshafen Ag Leistungsverzweigtes stufenloses Getriebe
US11846085B2 (en) 2020-02-17 2023-12-19 Deere & Company Energy management system for a hybrid vehicle with an electrically powered hydraulic system
US11325459B2 (en) 2020-10-09 2022-05-10 Deere & Company Low profile transmission assembly with integrated CVP
US11613246B2 (en) 2021-01-21 2023-03-28 Deere & Company Power control system with engine throttle shift function
US11628822B2 (en) 2021-02-09 2023-04-18 Deere & Company Power control system with stall prevention clutch modulation function
DE102021202092A1 (de) 2021-03-04 2022-09-08 Zf Friedrichshafen Ag Antriebsvorrichtung zum Antrieb eines Fahrzeugs, aufweisend eine E-Maschine
US11820361B2 (en) 2021-11-30 2023-11-21 Deere & Company Transmission assembly with electrical machine unit for improved shift quality
US11607948B1 (en) 2021-12-22 2023-03-21 Deere & Company Electronically-variable power shift transmission for work vehicles
US11585412B1 (en) 2021-12-22 2023-02-21 Deere & Company Electronically-variable, dual-path power shift transmission for work vehicles
DE102022204737A1 (de) 2022-05-16 2023-11-16 Zf Friedrichshafen Ag Getriebesystem, Steuerungsverfahren und Fahrzeug
DE102022204881A1 (de) 2022-05-17 2023-11-23 Zf Friedrichshafen Ag Leistungsverzweigungsgetriebe
US11913528B1 (en) 2022-10-28 2024-02-27 Deere & Company Multi-mode continuously variable transmission assembly with drop set arrangement

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0889260A2 (fr) * 1997-07-04 1999-01-07 ZF FRIEDRICHSHAFEN Aktiengesellschaft Transmission à variation continue
DE19749074A1 (de) * 1997-11-06 1999-05-20 Roland Dr Schmetz Landwirtschaftliches Nutzfahrzeug mit mechanisch-elektrisch leistungsverzweigtem Getriebe
DE10128076A1 (de) 2001-06-09 2002-12-12 Zahnradfabrik Friedrichshafen Leistungsverzweigungsgetriebe
DE10304917A1 (de) * 2003-02-07 2004-08-19 Zf Friedrichshafen Ag Stufenloses Getriebe
DE102012204477A1 (de) * 2012-03-21 2013-09-26 Zf Friedrichshafen Ag Getriebevorrichtung mit wenigstens einem elektrischen Variator zum stufenlosen Variieren einer Übersetzung und mit Leistungsverzweigung
WO2017049049A1 (fr) * 2015-09-17 2017-03-23 Dana Limited Configurations de groupe motopropulseur électrique hybride comprenant un variateur à bille utilisé comme une transmission mécanique à variation continue
US20170284517A1 (en) * 2013-12-31 2017-10-05 Deere & Company Multi-mode infinitely variable transmission that provides seamless shifting

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0889260A2 (fr) * 1997-07-04 1999-01-07 ZF FRIEDRICHSHAFEN Aktiengesellschaft Transmission à variation continue
DE19749074A1 (de) * 1997-11-06 1999-05-20 Roland Dr Schmetz Landwirtschaftliches Nutzfahrzeug mit mechanisch-elektrisch leistungsverzweigtem Getriebe
DE10128076A1 (de) 2001-06-09 2002-12-12 Zahnradfabrik Friedrichshafen Leistungsverzweigungsgetriebe
DE10304917A1 (de) * 2003-02-07 2004-08-19 Zf Friedrichshafen Ag Stufenloses Getriebe
DE102012204477A1 (de) * 2012-03-21 2013-09-26 Zf Friedrichshafen Ag Getriebevorrichtung mit wenigstens einem elektrischen Variator zum stufenlosen Variieren einer Übersetzung und mit Leistungsverzweigung
US20170284517A1 (en) * 2013-12-31 2017-10-05 Deere & Company Multi-mode infinitely variable transmission that provides seamless shifting
WO2017049049A1 (fr) * 2015-09-17 2017-03-23 Dana Limited Configurations de groupe motopropulseur électrique hybride comprenant un variateur à bille utilisé comme une transmission mécanique à variation continue

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230147860A1 (en) * 2020-09-29 2023-05-11 Hitachi Construction Machinery Co., Ltd. Speed-Changing Device
US11674576B2 (en) * 2020-09-29 2023-06-13 Hitachi Construction Machinery Co., Ltd. Speed-changing device
US12325305B2 (en) * 2022-01-19 2025-06-10 Deere & Company Power-split axle drive and agricultural vehicle
US12330501B2 (en) 2022-01-19 2025-06-17 Deere & Company Power-split axle drive, agricultural vehicle, and method for operating a power-split axle drive

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