US20010016532A1 - Transmission for hybrid electric vehicle - Google Patents
Transmission for hybrid electric vehicle Download PDFInfo
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- US20010016532A1 US20010016532A1 US09/749,685 US74968500A US2001016532A1 US 20010016532 A1 US20010016532 A1 US 20010016532A1 US 74968500 A US74968500 A US 74968500A US 2001016532 A1 US2001016532 A1 US 2001016532A1
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- motor
- engine
- differential
- way clutch
- drive
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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
- B60K17/00—Arrangement or mounting of transmissions in vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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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
- B60K6/38—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 ; 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 driveline clutches
- B60K6/383—One-way clutches or freewheel devices
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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
- B60K6/42—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
- B60K6/44—Series-parallel type
- B60K6/445—Differential gearing distribution type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
- B60W10/26—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
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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
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
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- 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
- F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
- F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
- F16H37/0833—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths
- F16H37/084—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths at least one power path being a continuously variable transmission, i.e. CVT
- F16H2037/0866—Power split variators with distributing differentials, with the output of the CVT connected or connectable to the output shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/06—Differential gearings with gears having orbital motion
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- 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
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S903/00—Hybrid electric vehicles, HEVS
- Y10S903/902—Prime movers comprising electrical and internal combustion motors
- Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S903/00—Hybrid electric vehicles, HEVS
- Y10S903/902—Prime movers comprising electrical and internal combustion motors
- Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
- Y10S903/904—Component specially adapted for hev
- Y10S903/905—Combustion engine
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S903/00—Hybrid electric vehicles, HEVS
- Y10S903/902—Prime movers comprising electrical and internal combustion motors
- Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
- Y10S903/904—Component specially adapted for hev
- Y10S903/906—Motor or generator
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S903/00—Hybrid electric vehicles, HEVS
- Y10S903/902—Prime movers comprising electrical and internal combustion motors
- Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
- Y10S903/904—Component specially adapted for hev
- Y10S903/909—Gearing
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S903/00—Hybrid electric vehicles, HEVS
- Y10S903/902—Prime movers comprising electrical and internal combustion motors
- Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
- Y10S903/904—Component specially adapted for hev
- Y10S903/912—Drive line clutch
- Y10S903/913—One way
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S903/00—Hybrid electric vehicles, HEVS
- Y10S903/902—Prime movers comprising electrical and internal combustion motors
- Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
- Y10S903/951—Assembly or relative location of components
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
- Arrangement Of Transmissions (AREA)
Abstract
To improve acceleration performance on starting and in low speed ranges as well as minimizing energy loss with its simple structure of light weight and small size, a transmission for a hybrid electric vehicle includes a first motor connected to a battery through an inverter, the first motor functioning as a generator, a differential disposed between an engine and the first motor to provide driving force from one of the first motor and the engine, a final reduction gear engaged with the differential to transmit drive force to wheels, a second motor connected to the battery through the inverter to directly drive an axle shaft, a first one-way clutch disposed between the differential and the engine, and a second one-way clutch disposed within the differential.
Description
- (a) Field of the Invention
- The present invention relates to a transmission for a hybrid electric vehicle (HEV) having a high acceleration performance on start and in low speed ranges as well as having a simple structure of light-weight and small-size, resulting in minimizing energy loss.
- (b) Description of the Related Art
- Hybrid electric vehicles (HEVs) were conceived as a way to compensate for the shortfall in battery technology of an electric vehicle. So, HEVs combine the internal combustion engine of a conventional vehicle with the battery and electric motor of an electric vehicle.
- Typically, the HEVs are classified into series, parallel, and split types according to a power transmission structure.
- The series type HEV uses an engine just as a generator for generating electricity for a battery pack so as to overcome the drawback of the electric vehicle having a short driving distance. That is, the driving force of the series type HEV comes entirely from the electric motor as in a purely electric vehicle. The series type HEV has a disadvantage in that a power loss occurs during an electricity/power conversion and an AC/DC conversion. However, the engine never idles, which reduces vehicle emissions.
- The parallel type HEV has a direct mechanical connection between the engine and the wheels as in a conventional vehicle, but also has an electric motor that drives the wheels so as to provide extra power to the driveline when power assist is needed for climbing on a slope or for quick acceleration.
- The split type HEV is a compromise type having advantages of both the series and parallel type systems for optimizing energy efficiency. FIG. 2 schematically shows a split type HEV.
- The split type HEV comprises a
battery 112, aninverter 114 for inverting DC (direct current) from thebattery 112 into AC (alternating current), amotor 116 for converting electrical energy from theinverter 114 into mechanical energy, aplanetary gear set 120 acting as a mechanical energy distributor, and afinal reduction gear 124 for transferring the driving torque to wheels. - The
planetary gear set 120 includes asun gear 128, aring gear 130 connected to thefinal reduction gear 124, and afew pinion gears 132 connected by acarrier 134 and circumferentially interposed between thesun gear 128 and the ring gear. - In the split type HEV, the electric motor supplies power when the vehicle is starting and running at a low speed, and it can easily reverse the vehicle by changing a rotation direction of the
motor 116. The vehicle uses the power created from the engine in a normal driving state and the motor acts as a generator for regenerating the battery during the engine operation. The motor can also provide extra power to the wheels when a power assist is needed for quick acceleration. - The series and parallel type HEVs use continuously variable transmissions (CVTs), and the adoption of the CVT increases the vehicle's weight and causes energy loss through generating hydraulic pressure.
- In the split type HEV, a planetary gear set interposed between the engine and the motor causes an increase in both the vehicle's weight and manufacturing costs.
- The present invention has been made in an effort to solve the above problems of the prior art.
- It is an object of the present invention to provide a transmission for a HEV capable of improving acceleration performance on starting and in low speed ranges as well as minimizing energy loss with its simple structure of light weight and small size.
- To achieve the above object, the present invention provides a transmission for a hybrid electric vehicle comprising a first motor connected to a battery through an inverter, the first motor functioning as a generator, a differential disposed between an engine and the first motor to provide driving force from one of the first motor and the engine, a final reduction gear engaged with the differential to transmit drive force to wheels, a second motor connected to the battery through the inverter to directly drive an axle shaft, a first one-way clutch disposed between the differential and the engine, and a second one-way clutch disposed within the differential.
- Preferably, the differential comprises a first drive pinion connected to the engine by the first one-way clutch, a second drive pinion having a first end connected to the first drive pinion by the second one-way clutch and a second end connected to the first motor, first and second driven pinions driven by the first and second drive pinions, respectively, and a carrier engaged with the first and second driven pinions to transmit power of the first and second drive pinions to the final reduction gear.
- Preferably, the first one way clutch is designed to transmit clockwise rotational force from the engine to the first drive pinion, and the second one-way clutch is designed to transmit clockwise rotational force from the second drive pinion to the first drive pinion.
- The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate an embodiment of the invention, and, together with the description, serve to explain the principles of the invention, wherein:
- FIG. 1 is a simplified block diagram of an HEV equipped with a transmission according to a preferred embodiment of the present invention; and
- FIG. 2 is a simplified block diagram of an HEV equipped with a prior art transmission.
- A preferred embodiment of the present invention will be described hereinafter with reference to the accompanying drawings.
- In FIG. 1, an HEV comprises a battery12, an
inverter 14 for inverting direct current (DC) of the battery 12 into alternating current (AC), twomotors combustion engine 20 for providing driving torque, afinal reduction gear 24 engaged with a differential, and first and second one-way clutches - The battery12 is preferably one of a Ni—MH battery and a Li-ion battery that is widely used for the HEV.
- The
motors differential 22 and theaxle shaft 30, respectively. Themotors - To drive the
final reduction gear 24 by coupling power from both theengine 20 and thefirst motor 16, a power coupling manner is used in this embodiment. That is, thedifferential 22 is disposed between thefirst motor 16 and theengine 20, and the one-way clutch 26 is disposed between thedifferential 22 and theengine 20. The one-way clutch 28 is disposed in thedifferential 22. - Describing more in detail, the
differential 22 includes afirst drive pinion 32 connected to theengine 20 by the one-way clutch 26, asecond drive pinion 34 having a first end connected to thefirst drive pinion 32 by the one-way clutch 28 and a second end connected to thefirst motor 16, first and second drivenpinions second drive pinions carrier 40 engaged with the drivenpinions second drive pinions final reduction gear 24. - The one-
way clutch 26 is designed to transmit clockwise power from theengine 20 to thefirst drive pinion 32, and the one-way clutch 28 is designed to transmit clockwise power from thesecond drive pinion 34 to thefirst drive pinion 32. - Accordingly, when the vehicle is accelerated, since the
second drive pinion 34 rotates clockwise by thefirst motor 16, the rotational power is transmitted only to thefirst drive pinion 32 but not to the engine. In a normal operation of the vehicle, since the power transmission shaft (i.e., crankshaft) of the engine rotates clockwise, the rotational power of the power transmission shaft is transmitted only to thefirst drive pinion 32 but not to thesecond drive pinion 34 and thefirst motor 16. During the normal operation of the vehicle, the rotation of thefirst motor 16 is controlled in connection with the rotations of the engine and the second motor. - The power transmission of the above described power transmission system will be described hereinafter.
- First, when the vehicle starts or runs at a low speed, only the first and
second motors first motor 16 drives thedifferential 22, and thesecond motor 18 drives theaxle shaft 30. Accordingly, the vehicle speed depends on a control logic associated with the first and second motors. At this point, the driving force through thefirst motor 16 is transmitted to thefirst drive pinion 32 synchronized with thesecond drive pinion 34 by the second one-way clutch 28. Here, theengine 20 operation is initiated by a starter motor. - When the vehicle is accelerated above a predetermined speed such that the rotational number becomes higher than that of the
first motor 16, thedifferential 22 is driven by theengine 20, while theaxle shaft 30 is continuously driven by thesecond motor 18, Here, thefirst motor 16 is rotatable in both directions (forward and reverse directions) according to the rotational numbers of theengine 20 and thesecond motor 18. When thefirst motor 16 rotates in the reverse direction, this functions as a generator for recharging the battery. - When braking force is applied to the vehicle, since the revival braking force is generated on the
second motor 18, thesecond motor 18 functions as a generator. - Since the above described HEV is designed to transmit power using a differential and a one-way clutch, the structure thereof is simpler than a conventional one employing a continuously variable transmission and a planetary gear unit to transmit power. Accordingly, the HEV according to the present invention is capable of improving acceleration performance on starting and in low speed ranges as well as minimizing energy loss with its simple structure of light weight and small size.
- Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that many variations and/or modifications of the basic inventive concepts herein taught which may appear to those skilled in the present art will still fall within the spirit and scope of the present invention, as defined in the appended claims.
Claims (3)
1. A transmission for a hybrid electric vehicle comprising:
a first motor connected to a battery through an inverter, the first motor functioning as a generator;
a differential disposed between an engine and the first motor to provide driving force from one of the first motor and the engine;
a final reduction gear engaged with the differential to transmit drive force to wheels;
a second motor connected to the battery through the inverter to directly drive an axle shaft;
a first one-way clutch disposed between the differential and the engine; and
a second one-way clutch disposed within the differential.
2. The transmission of wherein the differential comprises a first drive pinion connected to the engine by the first one-way clutch, a second drive pinion having a first end connected to the first drive pinion by the second one-way clutch and a second end connected to the first motor, first and second driven pinions driven by the first and second drive pinions, respectively, and a carrier engaged with the first and second driven pinions to transmit power of the first and second drive pinions to the final reduction gear.
claim 1
3. The transmission of wherein the first one way clutch is designed to transmit clockwise rotational force from the engine to the first drive pinion, and the second one-way clutch is designed to transmit clockwise rotational force from the second drive pinion to the first drive pinion.
claim 2
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR99-63696 | 1999-12-28 | ||
KR10-1999-0063696A KR100369135B1 (en) | 1999-12-28 | 1999-12-28 | Power transmit apparatus for hybrid electric vehicle |
Publications (2)
Publication Number | Publication Date |
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US20010016532A1 true US20010016532A1 (en) | 2001-08-23 |
US6416437B2 US6416437B2 (en) | 2002-07-09 |
Family
ID=19631018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/749,685 Expired - Fee Related US6416437B2 (en) | 1999-12-28 | 2000-12-28 | Transmission for hybrid electric vehicle |
Country Status (4)
Country | Link |
---|---|
US (1) | US6416437B2 (en) |
JP (1) | JP4355444B2 (en) |
KR (1) | KR100369135B1 (en) |
DE (1) | DE10065479A1 (en) |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002063182A1 (en) * | 2001-02-08 | 2002-08-15 | New Venture Gear, Inc. | Transfer case for hybrid vehicle |
WO2004010028A1 (en) * | 2002-07-22 | 2004-01-29 | Suenori Tsujimoto | Stepless speed change device |
EP1652719A1 (en) * | 2004-10-29 | 2006-05-03 | American Axle & Manufacturing, Inc. | Power-assisted differential assembly |
EP1816024A1 (en) * | 2004-11-24 | 2007-08-08 | Toyota Jidosha Kabushiki Kaisha | Vehicle control device |
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Also Published As
Publication number | Publication date |
---|---|
KR20010061207A (en) | 2001-07-07 |
JP4355444B2 (en) | 2009-11-04 |
KR100369135B1 (en) | 2003-01-24 |
JP2001239849A (en) | 2001-09-04 |
US6416437B2 (en) | 2002-07-09 |
DE10065479A1 (en) | 2001-07-26 |
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