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WO2008025691A1 - Hybrid drive unit - Google Patents

Hybrid drive unit Download PDF

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Publication number
WO2008025691A1
WO2008025691A1 PCT/EP2007/058607 EP2007058607W WO2008025691A1 WO 2008025691 A1 WO2008025691 A1 WO 2008025691A1 EP 2007058607 W EP2007058607 W EP 2007058607W WO 2008025691 A1 WO2008025691 A1 WO 2008025691A1
Authority
WO
WIPO (PCT)
Prior art keywords
coolant
drive unit
hybrid drive
transmission
rotor
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/EP2007/058607
Other languages
German (de)
French (fr)
Inventor
Matthias Reisch
Andreas Männer
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 WO2008025691A1 publication Critical patent/WO2008025691A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/06—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch
    • F16D25/062—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces
    • F16D25/063—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially
    • F16D25/0635—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs
    • F16D25/0638—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs with more than two discs, e.g. multiple lamellae
    • 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
    • B60K6/26—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 motors or the generators
    • 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
    • B60K6/38—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 driveline clutches
    • B60K6/387—Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
    • 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
    • B60K6/40—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 assembly or relative disposition of components
    • B60K6/405—Housings
    • 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
    • B60K6/48—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
    • 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
    • B60K6/48—Parallel type
    • B60K6/485—Motor-assist type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0061—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electrical machines
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/12—Details not specific to one of the before-mentioned types
    • F16D25/123—Details not specific to one of the before-mentioned types in view of cooling and lubrication
    • 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
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0473—Friction devices, e.g. clutches or brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/50—Structural details of electrical machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • B60L2240/425—Temperature
    • 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
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0476—Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof
    • 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
    • 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
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the invention relates to a hybrid drive unit according to the preamble of claim 1.
  • the torque converter is the common technology as a starting element in a power shift transmission.
  • one possibility would be to provide a hybrid drive unit in the converter's space, where it is desirable for the hybrid drive unit to occupy the same or smaller space than the converter.
  • hybrid drive unit Such a hybrid drive unit is described in the not yet published patent application DE 102006023289.5.
  • the hybrid drive unit is arranged between an internal combustion engine and a transmission and has an electric machine and two hydraulically shiftable clutches.
  • the hydraulic or cooling fluid of the clutches is provided by the transmission and each clutch is provided a pressure compensation chamber for the dynamic pressure compensation.
  • Three supply lines and a return line, four lines in total, are provided for the supply of the two clutches with hydraulic or cooling liquid.
  • a special design of the lines is necessary, and this training requires changes in the adjacent transmission compared to a design of the lines in a transmission with converter as a starting element.
  • a hybrid drive unit for a motor vehicle which comprises an electric machine between an internal combustion engine and a vehicle transmission, which contains at least one rotor and a stator and the electric machine is operable as a motor or generator. Radially within the electric machine at least one hydraulically switchable wet-running clutch is arranged.
  • the vehicle transmission in particular a power shift transmission, has a transmission input shaft and a transmission housing.
  • a coolant such as a cooling oil, according to the invention by a central coolant supply of the transmission to the hybrid drive unit and discharged. The coolant supply passes into a substantially closed coolant circuit.
  • the coolant is used in particular for cooling the clutch, but also, for example, for lubricating the bearings arranged in the coolant circuit and as pressure fluid in the pressure compensation chamber.
  • the hybrid drive unit can be installed in a drive train with an internal combustion engine and a transmission with little effort, for example in exchange for a hydrodynamic converter. Space is saved by taking advantage of the clutch area in the coolant circuit as a pressure compensation chamber for the clutch. On a separate pressure compensation chamber can be omitted, since the coolant is provided on both sides of the clutch piston and thus an equally high rotational pressure on both sides of the clutch piston is constructed.
  • a return spring of the clutch piston can be saved, since the pressure in the coolant circuit, for example, between 4 and 6 bar is set and the clutch piston is reset as soon as the control pressure of the clutch piston drops below the current pressure in the coolant circuit. Since a powertrain can be expanded with few additions to a hybrid powertrain, this is an advantage that makes it possible to produce the hybrid technology at a reasonable cost. Also, the installation of a hybrid drive unit in current internal combustion engine vehicles is simplified without major structural changes and increases the attractiveness of hybrid technology.
  • the central coolant supply is limited by a hollow shaft rotatably connected to the transmission housing and located within the hollow shaft transmission input shaft, wherein the coolant circuit is provided outside the hollow shaft and within the rotor of the electric machine.
  • the coolant circuit is provided with seals, for example, O-rings, rectangular rings or radial shaft seals can be used.
  • the rectangular rings are used at higher pressures up to 70 bar, but have smaller leaks.
  • the radial shaft seals are only suitable for low pressures. Seals are usually provided between two relatively rotating components, all rotating seals in the coolant circuit according to the invention are arranged close to the transmission input shaft, so that the constructive maximum sliding speed of the seals, for example, 30 m / s is not exceeded.
  • the sealing rings should be provided within the first half of the inner radius of the rotor.
  • the seals are between a rotating with the transmission input shaft and a housing-fixed component and / or between one with the Rotary gear input shaft and provided with a rotating component to the rotor and / or between a rotating with the rotor and a housing-fixed component and / or between a rotating with the rotor and a rotating with a pump drive shaft component.
  • five seals can be used, the first seal being provided between the support of the rotor and the pump drive shaft and the pump drive shaft being mounted on the hollow axle.
  • the second seal is provided between the rotor carrier and a component rotating with the transmission input, and the third seal is provided between a component rotating with the rotor carrier and a component rotating with the transmission input shaft.
  • the fourth seal is provided between a component rotating with the transmission input shaft and the end of the hollow shaft at the combustion engine end, and the fifth seal is provided between a component fixed to the housing and a component rotating with the rotor of the electric machine.
  • the first four seals are exposed to higher pressures, but may have smaller leaks as they are all located in a wet room and only seal different areas with different pressures against each other.
  • the fifth seal does not have to withstand the high pressures, but must reliably seal the wet room against a drying room.
  • the coolant is supplied from the central coolant supply by at least one supplying coolant line in the coolant circuit and guided by adjacent components, such as the rotor carrier, radially outward to the inside of the rotor of the electric machine. From the inside of the rotor, the coolant is passed through the clutch, or through the pressure equalization chamber, radially inwards back to the transmission input shaft and to the central coolant supply. Within the hollow shaft, a bushing is present and within the socket is the transmission input shaft. The bushing separates the supply and discharge lines for the coolant from one another in the central coolant supply, the inflow occurring between the bush and the hollow axle and the outflow between the bushing and the transmission input shaft. Between the supply and discharge lines of the central coolant supply, the coolant is passed through the coolant circuit and passes through the first and the second and the third and the fourth seal after each other.
  • the inventive position of the seals and the flow of the coolant all seals can be arranged close to the transmission shaft and the gap between the rotor and stator in the electric machine can be made dry. With a dry gap between the rotor and the stator, advantageously only slight eddy losses will occur. This can be done due to the coolant flow in the coupling region according to the invention, a pressure equalization and the space for a separate pressure compensation chamber is saved and allows a compressed design.
  • openings for passing coolant, power and signal connections for the electric machine are provided in order to adapt the transmission to the hybrid drive unit.
  • a clutch is provided in the hybrid drive unit.
  • a pressure line for supplying a medium for actuating the clutch is provided radially inside the hollow axle of the transmission, in particular in the interior of the transmission input shaft.
  • Fig. 1 a mounted on a transmission, not shown hybrid drive unit is shown.
  • the core element of the hybrid drive unit is the electric machine 3 with its rotor 4 and its stator 5, wherein the stator 5 is rotatably connected to a housing 8.
  • the housing 8 may be a transmission housing or a separate housing of a hybrid drive unit.
  • the rotor 4 of the electric machine 3 is mounted on a rotor carrier 17, which has a hydraulically controlled wet-running multi-plate clutch 6 in its interior. Since the clutch 6 is cooled by a coolant, the interior of the rotor carrier 17 is formed as a sealed wet space.
  • a seal 22 in particular a radial shaft seal, is provided.
  • a first seal 18 seals between the rotor carrier 17 and a pump drive shaft 16.
  • the second and third seals 19, 20 seal between the rotor carrier 17 and a rotating with the rotor carrier 17 and a component rotating with the transmission input shaft 7 component and the fourth seal 21 between a rotating with the transmission input shaft 7 component and the hollow shaft 15 is provided.
  • the fifth seal 22 seals between a housing-fixed component and the rotor carrier 17, wherein the fifth seal 22, the wet space reliably from a drying room.
  • the three components hollow axle 15, bushing 14 and transmission input shaft 7 belong to the transmission and together limit the coolant lines 12, 13, which belong to the central coolant supply Z.
  • the clutch piston 2 is actuated by a medium which can be supplied through a pressure line 23 and which is provided radially inside the hollow shaft 15 in the interior of the transmission input shaft.
  • FIG 2 shows the central coolant supply Z and the arrangement of the inflow and outflow lines 12, 13 of the coolant between the hollow shaft 15 and the transmission input shaft 7 and the separation of the inflow and outflow lines 12, 13 through the bush 14.
  • Fig. 3 shows the coolant circuit K and the leadership of the coolant from the central coolant supply Z along the pump drive shaft 16 and then radially outward into the interior of the rotor support 17 and further to the inside of the rotor 4. From the inside of the rotor 4 is the Coolant guided radially inwardly through the coupling 6 and located in the coupling area pressure equalization chamber 1, before being returned to the central coolant supply Z again.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

Described is a hybrid drive unit for a motor vehicle for installation between an internal combustion engine and a vehicle transmission, which hybrid drive unit has an electric machine (3) with a rotor (4) and a stator (5) and can be operated as a motor or a generator. Arranged radially within the electric machine (3) is at least one switchable clutch (6), and the vehicle transmission has a transmission input shaft (7) and a transmission housing (8). Coolant, for example cooling oil, is supplied to and discharged from the transmission to the hybrid drive unit, substantially for the purpose of cooling the clutch (6), by means of a central coolant supply (Z). Connected to the central coolant supply (Z) is a substantially closed coolant circuit (K) in which is provided, in the region of the clutch (6), a pressure compensating space (1) which can be traversed by the coolant of the coolant circuit (K).

Description

Hybridantriebseinheit Hybrid drive unit

Die Erfindung betrifft eine Hybridantriebseinheit gemäß dem Oberbegriff des Anspruches 1.The invention relates to a hybrid drive unit according to the preamble of claim 1.

Heutzutage ist der Drehmomentwandler die gängige Technologie als Anfahrelement in einem Lastschaltgetriebe. Bei einem Übergang zur Hybridtechnologie wäre eine Möglichkeit, eine Hybridantriebseinheit auf dem Platz des Wandlers vorzusehen, wobei es wünschenswert ist, dass die Hybridantriebseinheit den gleichen oder geringeren Bauraum als der Wandler in Anspruch nimmt.Nowadays, the torque converter is the common technology as a starting element in a power shift transmission. In a transition to hybrid technology, one possibility would be to provide a hybrid drive unit in the converter's space, where it is desirable for the hybrid drive unit to occupy the same or smaller space than the converter.

Eine derartige Hybridantriebseinheit ist in der noch nicht veröffentlichten Patentanmeldung der Anmelderin DE 102006023289.5 beschrieben. Die Hybridantriebseinheit ist zwischen einem Verbrennungsmotor und einem Getriebe angeordnet und weist eine elektrische Maschine und zwei hydraulisch schaltbare Kupplungen auf. Die Hydraulik- beziehungsweise Kühlflüssigkeit der Kupplungen wird vom Getriebe bereitgestellt und je Kupplung ist ein Druckausgleichsraum für den dynamischen Druckausgleich vorgesehen. Drei Zuführungsleitungen und eine Rückführleitung, insgesamt vier Leitungen, sind für die Versorgung der zwei Kupplungen mit Hydraulik- beziehungsweise Kühlflüssigkeit vorgesehen. Für diese Hybridantriebseinheit ist eine besondere Ausbildung der Leitungen notwendig, und diese Ausbildung erfordert Veränderungen in dem angrenzenden Getriebe gegenüber einer Auslegung der Leitungen in einem Getriebe mit Wandler als Anfahrelement.Such a hybrid drive unit is described in the not yet published patent application DE 102006023289.5. The hybrid drive unit is arranged between an internal combustion engine and a transmission and has an electric machine and two hydraulically shiftable clutches. The hydraulic or cooling fluid of the clutches is provided by the transmission and each clutch is provided a pressure compensation chamber for the dynamic pressure compensation. Three supply lines and a return line, four lines in total, are provided for the supply of the two clutches with hydraulic or cooling liquid. For this hybrid drive unit, a special design of the lines is necessary, and this training requires changes in the adjacent transmission compared to a design of the lines in a transmission with converter as a starting element.

Größere Veränderungen im Getriebe, wie beispielsweise eine neue Auslegung der Hydraulik- beziehungsweise eine Änderung der Kühlflüssigkeitslei- tungen, sind mit hohem Aufwand und Kosten verbunden. Eine Anpassung der Hybridantriebseinheit zu den im Getriebe schon vorhandenen Hydraulik- bezie- hungsweise Kühlflüssigkeitsleitungen würde eine Verbreitung der Hybridtechnologie begünstigen.Larger changes in the transmission, such as a new design of the hydraulic or a change in the Kühlflüssigkeitslei- lines, are associated with high costs and costs. An adaptation of the hybrid drive unit to the hydraulic relationship already existing in the transmission. coolant lines would favor the spread of hybrid technology.

Es ist die Aufgabe der vorliegenden Erfindung, eine Hybridantriebseinheit vorzusehen, die mit vorhandenen Antriebssystemen, das heißt deren Getrieben und Verbrennungsmotoren zusammengebaut werden kann, ohne wesentliche Veränderungen insbesondere bezüglich des Kühlmittel-Kreislaufs derselben durchzuführen.It is the object of the present invention to provide a hybrid drive unit which can be assembled with existing drive systems, that is to say their transmissions and internal combustion engines, without substantial changes, in particular with regard to the coolant circuit of the same.

Erfindungsgemäß wird diese Aufgabe durch eine Hybridantriebseinheit für ein Kraftfahrzeug gelöst, welche zwischen einem Verbrennungsmotor und einem Fahrzeuggetriebe eine elektrische Maschine aufweist, die mindestens einen Rotor und einen Stator enthält und die elektrische Maschine als Motor oder Generator betreibbar ist. Radial innerhalb der elektrischen Maschine ist mindestens eine hydraulisch schaltbare nasslaufende Kupplung angeordnet. Das Fahrzeuggetriebe, insbesondere ein Lastschaltgetriebe, weist eine Getriebeeingangswelle und ein Getriebegehäuse auf. Ein Kühlmittel, beispielsweise ein Kühlöl, wird erfindungsgemäß durch eine zentrale Kühlmittelversorgung des Getriebes zur Hybridantriebseinheit zu- und abgeführt. Die Kühlmittelversorgung geht in einen im Wesentlichen geschlossenen Kühlmittel-Kreislauf über. Das Kühlmittel wird insbesondere zur Kühlung der Kupplung genutzt, aber beispielsweise auch zur Schmierung der im Kühlmittel-Kreislauf angeordneten Lager und als Druckflüssigkeit in dem Druckausgleichraum. Durch Verwendung der bereits vorhandenen zentralen Kühlmittelversorgung des Getriebes kann die Hybridantriebseinheit in einen Antriebsstrang mit einem Verbrennungsmotor und einem Getriebe mit geringem Aufwand, beispielsweise im Tausch gegen einen hydrodynamischen Wandler, eingebaut werden. Platz wird gespart durch das Ausnutzen des Kupplungsbereichs im Kühlmittel-Kreislauf als Druckausgleichsraum für die Kupplung. Auf einen separaten Druckausgleichsraum kann verzichtet werden, da das Kühlmittel auf beiden Seiten des Kupplungskolbens vorgesehen ist und somit ein gleich hoher Rotationsdruck auf beiden Seiten des Kupplungskolbens aufgebaut wird. Eine Rückstellfeder des Kupplungskolbens kann eingespart werden, da der Druck im Kühlmittel-Kreislauf beispielsweise zwischen 4 und 6 bar eingestellt ist und der Kupplungskolben zurückgestellt wird, sobald der Steuerdruck des Kupplungskolbens unter den momentanen Druck im Kühlmittel-Kreislauf abfällt. Da ein Antriebsstrang mit wenigen Ergänzungen zu einem Hybridantriebsstrang erweitert werden kann, ist dies ein Vorteil, der es möglich macht, die Hybridtechnik zu angemessenen Kosten herzustellen. Ebenfalls wird der Einbau einer Hybridantriebseinheit in derzeitige Verbrennungsmotor-Fahrzeuge ohne größere bauliche Veränderungen vereinfacht und die Attraktivität der Hybrid-Technologie erhöht.According to the invention this object is achieved by a hybrid drive unit for a motor vehicle, which comprises an electric machine between an internal combustion engine and a vehicle transmission, which contains at least one rotor and a stator and the electric machine is operable as a motor or generator. Radially within the electric machine at least one hydraulically switchable wet-running clutch is arranged. The vehicle transmission, in particular a power shift transmission, has a transmission input shaft and a transmission housing. A coolant, such as a cooling oil, according to the invention by a central coolant supply of the transmission to the hybrid drive unit and discharged. The coolant supply passes into a substantially closed coolant circuit. The coolant is used in particular for cooling the clutch, but also, for example, for lubricating the bearings arranged in the coolant circuit and as pressure fluid in the pressure compensation chamber. By using the already existing central coolant supply of the transmission, the hybrid drive unit can be installed in a drive train with an internal combustion engine and a transmission with little effort, for example in exchange for a hydrodynamic converter. Space is saved by taking advantage of the clutch area in the coolant circuit as a pressure compensation chamber for the clutch. On a separate pressure compensation chamber can be omitted, since the coolant is provided on both sides of the clutch piston and thus an equally high rotational pressure on both sides of the clutch piston is constructed. A return spring of the clutch piston can be saved, since the pressure in the coolant circuit, for example, between 4 and 6 bar is set and the clutch piston is reset as soon as the control pressure of the clutch piston drops below the current pressure in the coolant circuit. Since a powertrain can be expanded with few additions to a hybrid powertrain, this is an advantage that makes it possible to produce the hybrid technology at a reasonable cost. Also, the installation of a hybrid drive unit in current internal combustion engine vehicles is simplified without major structural changes and increases the attractiveness of hybrid technology.

Die zentrale Kühlmittelversorgung ist begrenzt durch eine mit dem Getriebegehäuse drehfest verbundene Hohlachse und der innerhalb der Hohlachse befindlichen Getriebeeingangswelle, wobei der Kühlmittel-Kreislauf außerhalb der Hohlachse und innerhalb des Rotors der elektrische Maschine vorgesehen ist.The central coolant supply is limited by a hollow shaft rotatably connected to the transmission housing and located within the hollow shaft transmission input shaft, wherein the coolant circuit is provided outside the hollow shaft and within the rotor of the electric machine.

Der Kühlmittel-Kreislauf ist mit Dichtungen versehen, beispielsweise können O-Ringe, Rechteckringe oder Radialwellendichtringe verwendet werden. Die Rechteckringe werden bei höheren Drücke bis 70 bar eingesetzt, weisen jedoch kleinere Leckagen auf. Die Radialwellendichtringe sind nur für niedrige Drücke geeignet. Dichtungen werden üblicherweise zwischen zwei relativ zueinander drehenden Bauteilen vorgesehen, wobei alle drehenden Dichtungen in dem Kühlmittel-Kreislauf erfindungsgemäß nahe zur Getriebeeingangswelle angeordnet sind, so dass die konstruktiv höchst zulässige Gleitgeschwindigkeit der Dichtungen, beispielsweise 30 m/s, nicht überschritten wird. Vorzugsweise sollten die Dichtringe innerhalb der ersten Hälfte des Innenradius des Rotors vorgesehen sein.The coolant circuit is provided with seals, for example, O-rings, rectangular rings or radial shaft seals can be used. The rectangular rings are used at higher pressures up to 70 bar, but have smaller leaks. The radial shaft seals are only suitable for low pressures. Seals are usually provided between two relatively rotating components, all rotating seals in the coolant circuit according to the invention are arranged close to the transmission input shaft, so that the constructive maximum sliding speed of the seals, for example, 30 m / s is not exceeded. Preferably, the sealing rings should be provided within the first half of the inner radius of the rotor.

Die Dichtungen sind zwischen einem mit der Getriebeeingangswelle rotierenden und einem gehäusefesten Bauteil und/oder zwischen einem mit der Getriebeeingangswelle rotierenden und einem mit dem Rotor rotierenden Bauteil und/oder zwischen einem mit dem Rotor rotierenden und einem gehäusefesten Bauteil und/oder zwischen einem mit dem Rotor rotierenden und einem mit einer Pumpenantriebswelle rotierenden Bauteil vorgesehen.The seals are between a rotating with the transmission input shaft and a housing-fixed component and / or between one with the Rotary gear input shaft and provided with a rotating component to the rotor and / or between a rotating with the rotor and a housing-fixed component and / or between a rotating with the rotor and a rotating with a pump drive shaft component.

Insbesondere können fünf Dichtungen benutzt werden, wobei die erste Dichtung zwischen dem Träger des Rotors und der Pumpenantriebswelle vorgesehen ist und die Pumpenantriebswelle auf der Hohlachse gelagert ist. Die zweite Dichtung ist zwischen dem Rotorträger und einem mit der Getriebeeingangsweite rotierenden Bauteil vorgesehen und die dritte Dichtung ist zwischen einem mit dem Rotorträger rotierenden Bauteil und einem mit der Getriebeeingangswelle rotierenden Bauteil vorgesehen. Die vierte Dichtung ist zwischen einem mit der Getriebeeingangswelle rotierenden Bauteil und dem verbren- nungsmotorseitigen Ende der Hohlachse vorgesehen und die fünfte Dichtung ist zwischen einem gehäusefesten und einem mit dem Rotor der elektrischen Maschine rotierenden Bauteil vorgesehen. Wenn die Dichtungen in der vorbeschriebenen Weise angeordnet sind, können alle Dichtungen vorteilhafterweise nahe zur Getriebeeingangswelle platziert werden. Die ersten vier Dichtungen sind höheren Drücken ausgesetzt, dürfen jedoch kleinere Leckagen vorweisen, da diese sämtlich in einem Nassraum angeordnet sind und ausschließlich verschiedene Bereiche mit unterschiedlichen Drücken gegeneinander abdichten. Die fünfte Dichtung braucht nicht den hohen Drücken standhalten, muss jedoch den Nassraum gegen einen Trockenraum zuverlässig abdichten.In particular, five seals can be used, the first seal being provided between the support of the rotor and the pump drive shaft and the pump drive shaft being mounted on the hollow axle. The second seal is provided between the rotor carrier and a component rotating with the transmission input, and the third seal is provided between a component rotating with the rotor carrier and a component rotating with the transmission input shaft. The fourth seal is provided between a component rotating with the transmission input shaft and the end of the hollow shaft at the combustion engine end, and the fifth seal is provided between a component fixed to the housing and a component rotating with the rotor of the electric machine. When the seals are arranged in the manner described above, all seals can be advantageously placed close to the transmission input shaft. The first four seals are exposed to higher pressures, but may have smaller leaks as they are all located in a wet room and only seal different areas with different pressures against each other. The fifth seal does not have to withstand the high pressures, but must reliably seal the wet room against a drying room.

Das Kühlmittel wird von der zentralen Kühlmittelversorgung durch mindestens eine zuführende Kühlmittelleitung in den Kühlmittel-Kreislauf zugeführt und durch angrenzende Bauteile, beispielsweise den Rotorträger, radial nach außen zur Innenseite des Rotors der elektrischen Maschine geführt. Von der Innenseite des Rotors wird das Kühlmittel durch die Kupplung, beziehungsweise durch den Druckausgleichraum, radial nach innen zurück zur Getriebeeingangswelle und zu der zentralen Kühlmittelversorgung geführt. Innerhalb der Hohlachse ist eine Buchse vorhanden und innerhalb der Buchse befindet sich die Getriebeeingangswelle. Die Buchse trennt in der zentralen Kühlmittelversorgung die Zu- und Abflussleitungen für das Kühlmittel voneinander, wobei der Zufluss zwischen der Buchse und der Hohlachse und der Abfluss zwischen der Buchse und der Getriebeeingangswelle erfolgt. Zwischen den Zu- und Abflussleitungen der zentralen Kühlmittelversorgung wird das Kühlmittel durch den Kühlmittel-Kreislauf geführt und passiert die erste und die zweite und die dritte und die vierte Dichtung nach einander.The coolant is supplied from the central coolant supply by at least one supplying coolant line in the coolant circuit and guided by adjacent components, such as the rotor carrier, radially outward to the inside of the rotor of the electric machine. From the inside of the rotor, the coolant is passed through the clutch, or through the pressure equalization chamber, radially inwards back to the transmission input shaft and to the central coolant supply. Within the hollow shaft, a bushing is present and within the socket is the transmission input shaft. The bushing separates the supply and discharge lines for the coolant from one another in the central coolant supply, the inflow occurring between the bush and the hollow axle and the outflow between the bushing and the transmission input shaft. Between the supply and discharge lines of the central coolant supply, the coolant is passed through the coolant circuit and passes through the first and the second and the third and the fourth seal after each other.

Durch die erfindungsgemäße Lage der Dichtungen und den Fluss des Kühlmittels können alle Dichtungen nahe zur Getriebewelle angeordnet und der Spalt zwischen Rotor und Stator in der elektrischen Maschine kann trocken ausgebildet werden. Mit einem trockenen Spalt zwischen Rotor und Stator werden vorteilhafterweise nur geringe Wirbeiverluste entstehen. Dazu kann aufgrund des erfindungsgemäßen Kühlmittelverlaufs im Kupplungsbereich ein Druckausgleich erfolgen und der Bauraum für einen separaten Druckausgleichsraum wird eingespart und eine komprimierte Bauweise ermöglicht.The inventive position of the seals and the flow of the coolant all seals can be arranged close to the transmission shaft and the gap between the rotor and stator in the electric machine can be made dry. With a dry gap between the rotor and the stator, advantageously only slight eddy losses will occur. This can be done due to the coolant flow in the coupling region according to the invention, a pressure equalization and the space for a separate pressure compensation chamber is saved and allows a compressed design.

In dem Getriebegehäuse werden Öffnungen zur Durchführung von Kühlmittel-, Strom- und Signalanschlüssen für die elektrische Maschine vorgesehen, um das Getriebe an die Hybridantriebseinheit anzupassen.In the transmission housing, openings for passing coolant, power and signal connections for the electric machine are provided in order to adapt the transmission to the hybrid drive unit.

in der Hybridantriebseinheit ist eine Kupplung vorgesehen. Wenn die Kupplung hydraulisch gesteuert ist, ist eine Druckleitung zur Zuführung eines Mediums zur Betätigung der Kupplung radial innerhalb der Hohlachse des Getriebes, insbesondere im Innenraum der Getriebeeingangswelle, vorgesehen.in the hybrid drive unit, a clutch is provided. When the clutch is hydraulically controlled, a pressure line for supplying a medium for actuating the clutch is provided radially inside the hollow axle of the transmission, in particular in the interior of the transmission input shaft.

Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Patentansprüchen und den unter Bezugnahme auf die Zeichnungen prinzipmäßig beschriebenen Ausführungsbeispielen. Es zeigen:Further advantages and advantageous embodiments of the invention will become apparent from the claims and the embodiments described in principle with reference to the drawings. Show it:

Fig. 1 einen Radialschnitt durch eine erfindungsgemäße Hybridantriebseinheit,1 shows a radial section through a hybrid drive unit according to the invention,

Fig. 2 den Kühlmittelfluss durch die zentrale Kühlmittelversorgung der Hybridantriebseinheit und2 shows the coolant flow through the central coolant supply of the hybrid drive unit and

Fig. 3 den Kühlmittelfluss durch den Kühlmittel-Kreislauf der Hybridantriebseinheit.3 shows the coolant flow through the coolant circuit of the hybrid drive unit.

In Fig. 1 ist eine an einem nicht gezeigten Getriebe angebaute Hybridantriebseinheit dargestellt. Das Kernelement der Hybridantriebseinheit ist die elektrische Maschine 3 mit ihrem Rotor 4 und ihrem Stator 5, wobei der Stator 5 mit einem Gehäuse 8 drehfest verbunden ist. Das Gehäuse 8 kann ein Getriebegehäuse oder ein separates Gehäuse einer Hybridantriebseinheit sein. Der Rotor 4 der elektrischen Maschine 3 ist auf einem Rotorträger 17 befestigt, welcher in seinem Innenraum eine hydraulisch gesteuerte nasslaufende Lamellenkupplung 6 aufweist. Da die Kupplung 6 von einer Kühlflüssigkeit gekühlt wird, ist der Innenraum des Rotorträgers 17 als ein abgedichteter Nassraum ausgebildet. Dazu ist eine Dichtung 22, insbesondere ein Radialwellendichtring, vorgesehen. Zusätzlich sind vier weitere Dichtungen 18, 19, 20, 21 , insbesondere Rechteckringe vorgesehen, welche Bereiche verschiedenen Drucks im Nassraum von einander trennen. Eine erste Dichtung 18 dichtet zwischen dem Rotorträger 17 und einer Pumpenantriebswelle 16. Die zweite und die dritte Dichtung 19, 20 dichten zwischen dem Rotorträger 17 beziehungsweise einem mit dem Rotorträger 17 rotierenden Bauteil und einem mit der Getriebeeingangswelle 7 rotierenden Bauteil und die vierte Dichtung 21 ist zwischen einem mit der Getriebeeingangswelle 7 rotierenden Bauteil und der Hohlachse 15 vorgesehen. Die fünfte Dichtung 22 dichtet zwischen einem gehäusefesten Bauteil und dem Rotorträger 17, wobei die fünfte Dichtung 22 den Nassraum von einem Trockenraum zuverlässig abclichtet. Die drei Bauteile Hohlachse 15, Buchse 14 und Getriebeeingangswelle 7 gehören zum Getriebe und begrenzen zusammen die Kühlmittelleitungen 12, 13, welche zu der zentralen Kühlmittel- vorsorgung Z gehören.In Fig. 1 a mounted on a transmission, not shown, hybrid drive unit is shown. The core element of the hybrid drive unit is the electric machine 3 with its rotor 4 and its stator 5, wherein the stator 5 is rotatably connected to a housing 8. The housing 8 may be a transmission housing or a separate housing of a hybrid drive unit. The rotor 4 of the electric machine 3 is mounted on a rotor carrier 17, which has a hydraulically controlled wet-running multi-plate clutch 6 in its interior. Since the clutch 6 is cooled by a coolant, the interior of the rotor carrier 17 is formed as a sealed wet space. For this purpose, a seal 22, in particular a radial shaft seal, is provided. In addition, four further seals 18, 19, 20, 21, in particular rectangular rings are provided, which separate areas of different pressure in the wet room from each other. A first seal 18 seals between the rotor carrier 17 and a pump drive shaft 16. The second and third seals 19, 20 seal between the rotor carrier 17 and a rotating with the rotor carrier 17 and a component rotating with the transmission input shaft 7 component and the fourth seal 21 between a rotating with the transmission input shaft 7 component and the hollow shaft 15 is provided. The fifth seal 22 seals between a housing-fixed component and the rotor carrier 17, wherein the fifth seal 22, the wet space reliably from a drying room. The three components hollow axle 15, bushing 14 and transmission input shaft 7 belong to the transmission and together limit the coolant lines 12, 13, which belong to the central coolant supply Z.

Durch die Führung des Kühlmittel-Kreislaufs K im Kupplungsbereich erfolgt ein Druckausgleich zwischen beiden Seiten des Kupplungskolbens 2. Ein gleich hoher Rotationsdruck wird auf beiden Seiten des Kupplungskolbens 2 aufgebaut und der Kupplungsbereich wird als Druckausgleichsraum 1 genutzt, wobei auf einen separaten Druckausgleichsraum verzichtet werden kann.By the leadership of the coolant circuit K in the clutch area, a pressure equalization between both sides of the clutch piston 2. A same high rotational pressure is built up on both sides of the clutch piston 2 and the clutch area is used as a pressure equalization chamber 1, which can be dispensed with a separate pressure compensation chamber.

Der Kupplungskolben 2 wird durch ein Medium betätigt, welches durch eine Druckleitung 23 zuführbar ist und welche radial innerhalb der Hohlachse 15 im Innenraum der Getriebeeingangswelle vorgesehen ist.The clutch piston 2 is actuated by a medium which can be supplied through a pressure line 23 and which is provided radially inside the hollow shaft 15 in the interior of the transmission input shaft.

Fig. 2 zeigt die zentrale Kühlmittelversorgung Z und die Anordnung der Zu- und Abflussleitungen 12, 13 des Kühlmittels zwischen Hohlachse 15 und Getriebeeingangswelle 7 und die Trennung der Zu- und Abflussleitungen 12, 13 durch die Buchse 14.2 shows the central coolant supply Z and the arrangement of the inflow and outflow lines 12, 13 of the coolant between the hollow shaft 15 and the transmission input shaft 7 and the separation of the inflow and outflow lines 12, 13 through the bush 14.

Fig. 3 zeigt den Kühlmittel-Kreislauf K und die Führung des Kühlmittels von der zentralen Kühlmittelversorgung Z entlang der Pumpenantriebswelle 16 und anschließend radial nach außen in den Innenraum des Rotorträgers 17 und weiter zur Innenseite des Rotors 4. Von der Innenseite des Rotors 4 wird das Kühlmittel radial nach innen durch die Kupplung 6 und den im Kupplungsbereich befindlichen Druckausgleichraum 1 geführt, bevor es wieder in die zentrale Kühlmittelversorgung Z zurückgeführt wird. BezuαszetchenFig. 3 shows the coolant circuit K and the leadership of the coolant from the central coolant supply Z along the pump drive shaft 16 and then radially outward into the interior of the rotor support 17 and further to the inside of the rotor 4. From the inside of the rotor 4 is the Coolant guided radially inwardly through the coupling 6 and located in the coupling area pressure equalization chamber 1, before being returned to the central coolant supply Z again. Bezuαszetchen

1 Druckausgleichraum1 pressure compensation room

2 Kupplungskolben2 clutch pistons

3 elektrische Maschine3 electric machine

4 Rotor4 rotor

5 Stator5 stator

6 Kupplung6 clutch

7 Getriebeeingangswelle7 transmission input shaft

8 Getriebegehäuse/Gehäuse der Hybridantriebseinheit8 Transmission housing / housing of the hybrid drive unit

12 Kühlmittel-Zuflussleitung12 coolant supply line

13 Kühlmittel-Abflussleitung13 coolant drain line

14 Buchse14 socket

15 Hohlachse15 hollow axle

16 Pumpenantriebswelle16 pump drive shaft

17 Rotorträger17 rotor carrier

18 Dichtung18 seal

19 Dichtung19 seal

20 Dichtung20 seal

21 Dichtung21 seal

22 Dichtung22 seal

23 Druckleitung23 pressure line

K Kühlmittel-KreislaufK coolant circuit

Z zentrale Kühlmittelversorgung Z central coolant supply

Claims

Patentansprüche claims 1. Hybridantriebseinheit für ein Kraftfahrzeug zum Einbau zwischen einem Verbrennungsmotor und einem Fahrzeuggetriebe, welche eine elektrische Maschine (3) mit einem Rotor (4) und einem Stator (5) aufweist und als Motor oder Generator betreibbar ist, wobei radial innerhalb der elektrischen Maschine (3) mindestens eine schaltbare Kupplung (6) angeordnet ist und das Fahrzeuggetriebe eine Getriebeeingangswelle (7) und ein Getriebegehäuse (8) aufweist, dadurch gekennzeichnet, dass Kühlmittel, beispielsweise Kühlöl, im Wesentlichen zur Kühlung der Kupplung (6) durch eine zentrale Kühlmittelversorgung (Z) vom Getriebe zur Hybridantriebseinheit zu- und abführbar ist und dass sich der zentralen Kühlmittelversorgung (Z) ein im Wesentlichen geschlossener Kühlmittel-Kreislauf (K) anschließt und dass im Bereich der Kupplung (6) ein Druckausgleichraum (1) vorgesehen ist, welcher vom Kühlmittel des Kühlmittel-Kreislaufs (K) durchströmbar ist.1. Hybrid drive unit for a motor vehicle for installation between an internal combustion engine and a vehicle transmission, which has an electric machine (3) with a rotor (4) and a stator (5) and is operable as a motor or generator, wherein radially inside the electric machine ( 3) at least one shiftable clutch (6) is arranged and the vehicle transmission has a transmission input shaft (7) and a transmission housing (8), characterized in that coolant, for example cooling oil, substantially for cooling the clutch (6) by a central coolant supply ( Z) from the transmission to the hybrid drive unit and can be discharged and that the central coolant supply (Z) a substantially closed coolant circuit (K) connects and that in the region of the coupling (6) a pressure compensation chamber (1) is provided, which from Coolant of the coolant circuit (K) can be flowed through. 2. Hybridantriebseinheit für ein Kraftfahrzeug nach Anspruch 1 , dadurch gekennzeichnet, dass die zentrale Kühlmittelversorgung (Z) zwischen einer mit dem Getriebegehäuse (8) drehfest verbundenen Hohlachse (15) und der innerhalb der Hohlachse (15) befindlichen Getriebeeingangswelle (7) vorgesehen ist und der Kühlmittel-Kreislauf (K) radial außerhalb der Hohlachse (15) vorgesehen ist.2. hybrid drive unit for a motor vehicle according to claim 1, characterized in that the central coolant supply (Z) between a with the transmission housing (8) rotatably connected hollow shaft (15) and within the hollow shaft (15) located transmission input shaft (7) is provided and the coolant circuit (K) is provided radially outside the hollow axle (15). 3. Hybridantriebseinheit nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass Dichtungen (18, 19, 20, 21 , 22) zwischen einem ersten drehenden und einem zweiten drehenden beziehungsweise einem ortsfesten Bauteil radial innerhalb der Kupplung (6) und des Rotors (4) der elektrischen Maschine (3) vorgesehen sind und insbesondere innerhalb der ersten Hälfte des Innenradius des Rotors (4) liegen. 3. hybrid drive unit according to claim 1 or 2, characterized in that seals (18, 19, 20, 21, 22) between a first rotating and a second rotating or a stationary component radially within the coupling (6) and the rotor (4) the electric machine (3) are provided and in particular within the first half of the inner radius of the rotor (4) lie. 4. Hybridantriebseinheit nach Anspruch 3, dadurch g e k e n n z e i c h n e t , dass eine erste Dichtung (18) zwischen dem Rotorträger (17) und der Pumpenantriebswelle (16) vorgesehen ist und eine zweite und eine dritte Dichtung (19, 20) zwischen dem Rotorträger (17) und einem mit dem Rotorträger (17) rotierenden Bauteil und einem mit der Getriebeeingangsweite (7) rotierenden Bauteil vorgesehen sind und dass eine vierte Dichtung (21) zwischen einem mit der Getriebeeingangswelle (7) rotierenden Bauteil und der Hohlachse (15) auf dem verbrennungsmotorseitigen Ende der Hohlachse (15) vorgesehen ist und eine fünfte Dichtung (22) zwischen einem gehäusefesten und einem mit dem Rotor (4) der elektrischen Maschine (3) rotierenden Bauteil vorgesehen ist und dass die erste, zweite, dritte und vierte Dichtung (18, 19, 20, 21) innerhalb des Kühlmittel-Kreislaufs (K) der Hybrideinheit vorgesehen sind und die fünfte Dichtung (22) zu einem Trockenraum abdichtet.4. hybrid drive unit according to claim 3, characterized in that a first seal (18) between the rotor carrier (17) and the pump drive shaft (16) is provided and a second and a third seal (19, 20) between the rotor carrier (17) and a component rotating with the rotor carrier (17) and a component rotating with the transmission input (7), and a fourth seal (21) between a component rotating with the transmission input shaft (7) and the hollow axle (15) on the end of the combustion engine Hollow shaft (15) is provided and a fifth seal (22) between a housing-fixed and one with the rotor (4) of the electric machine (3) rotating member is provided and that the first, second, third and fourth seal (18, 19, 20, 21) are provided within the coolant circuit (K) of the hybrid unit and the fifth seal (22) seals to a dry space. 5. Hybridantriebseinheit nach einem der vorgehenden Ansprüche, dadurch g e k e n n z e i c h n e t , dass das in der zentralen Kühlmittelversorgung (Z) zugeführte Kühlmittel von der mindestens einen zuführenden Kühlmittelleitung (12, 13) in den Kühlmittel-Kreislauf (K) radial nach außen zur Innenseite des Rotors (4) der elektrischen Maschine (3) und durch die Kupplung (6) radial nach innen zurück zur Getriebeeingangswelle (7) und zur zentralen Kühlmittelversorgung (Z) führbar ist.5. Hybrid drive unit according to one of the preceding claims, characterized in that in the central coolant supply (Z) supplied coolant from the at least one supplying coolant line (12, 13) in the coolant circuit (K) radially outward to the inside of the rotor ( 4) of the electric machine (3) and by the coupling (6) radially inwardly back to the transmission input shaft (7) and to the central coolant supply (Z) is feasible. β. Hybridantriebseinheit nach Anspruch 4 oder 5, dadurch g e k e n n z e i c h n e t , dass eine Buchse (14) zur Trennung der Zu- und Abflussleitungen (12, 13) des Kühlmittels zwischen der Hohlachse (15) und der Getriebeeingangswelle (7) vorhanden ist, wobei die Zuflussleitung (12) eine äußere Leitung bildet und die Abflussleitung (13) eine innere Leitung bildet und dass das Kühlmittel zwischen den Zu- und Abflussleitungen (12, 13) der zentralen Kühlmittelversorgung (Z) die erste (18) und zweite (19) und dritte (20) und vierte (21) Dichtung in dieser Reihenfolge passiert. β. Hybrid drive unit according to claim 4 or 5, characterized in that a bush (14) for separating the inflow and outflow lines (12, 13) of the coolant between the hollow shaft (15) and the transmission input shaft (7) is present, wherein the inflow line (12 ) forms an outer conduit and the discharge line (13) forms an inner conduit and that the coolant between the supply and discharge lines (12, 13) of the central coolant supply (Z) the first (18) and second (19) and third (20 ) and fourth (21) seal happened in this order. 7. Hybridantriebseinheit nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass Öffnungen zur Durchführung von Kühlmittel-, Strom- und Signaianschlüssen für die elektrische Maschine (3) im Getriebegehäuse (8) vorgesehen sind.7. Hybrid drive unit according to one of the preceding claims, characterized in that openings for carrying out coolant, power and Signaianschlüssen for the electric machine (3) in the transmission housing (8) are provided. 8. Hybridantriebseinheit nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass eine Druckleitung (23) zur Zuführung eines Mediums zur Betätigung eines Kupplungskolbens (2) der Kupplung (6) radial innerhalb einer mit dem Getriebegehäuse (8) drehfest verbundenen Hohtachse (15) vorgesehen ist.8. Hybrid drive unit according to one of the preceding claims, characterized in that a pressure line (23) for supplying a medium for actuating a clutch piston (2) of the clutch (6) radially within a with the transmission housing (8) rotatably connected Hohtachse (15) is. 9. Hybridantriebseinheit nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass eine Druckleitung (23) zur Zuführung eines Mediums zur Betätigung eines Kupplungskolbens (2) der Kupplung (6) im Innenraum der Getriebeeingangswelle (7) vorgesehen ist. 9. Hybrid drive unit according to one of the preceding claims, characterized in that a pressure line (23) for supplying a medium for actuating a clutch piston (2) of the clutch (6) in the interior of the transmission input shaft (7) is provided.
PCT/EP2007/058607 2006-08-26 2007-08-20 Hybrid drive unit Ceased WO2008025691A1 (en)

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