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US20130331217A1 - Motor driving force transmission device - Google Patents

Motor driving force transmission device Download PDF

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Publication number
US20130331217A1
US20130331217A1 US13/979,304 US201213979304A US2013331217A1 US 20130331217 A1 US20130331217 A1 US 20130331217A1 US 201213979304 A US201213979304 A US 201213979304A US 2013331217 A1 US2013331217 A1 US 2013331217A1
Authority
US
United States
Prior art keywords
electric motor
driving force
motor
motor driving
speed reduction
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.)
Abandoned
Application number
US13/979,304
Other languages
English (en)
Inventor
Tsune Kobayashi
Tohru ONOZAKI
Masaharu Tagami
Motoyasu Yamamori
Hiroshi Takuno
Kunihiko Suzuki
Tomoyoshi TAKAI
Keita NOMURA
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.)
JTEKT Corp
Original Assignee
JTEKT Corp
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
Priority claimed from JP2011073852A external-priority patent/JP5741128B2/ja
Priority claimed from JP2011280033A external-priority patent/JP2013129311A/ja
Application filed by JTEKT Corp filed Critical JTEKT Corp
Assigned to JTEKT CORPORATION reassignment JTEKT CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOBAYASHI, TSUNE, NOMURA, Keita, ONOZAKI, Tohru, SUZUKI, KUNIHIKO, TAGAMI, MASAHARU, TAKAI, Tomoyoshi, TAKUNO, HIROSHI, YAMAMORI, MOTOYASU
Publication of US20130331217A1 publication Critical patent/US20130331217A1/en
Abandoned legal-status Critical Current

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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
    • F16H48/20—Arrangements for suppressing or influencing the differential action, e.g. locking devices
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/356—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having fluid or electric motor, for driving one or more wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/36—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings
    • B60K6/365—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings with the gears having orbital motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
    • B60K6/52—Driving a plurality of drive axles, e.g. four-wheel drive
    • 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
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
    • 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
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B60L50/16—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
    • 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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
    • 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
    • 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
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • 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
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/184—Preventing damage resulting from overload or excessive wear of the driveline
    • B60W30/1843—Overheating of driveline components
    • 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
    • F16H48/20—Arrangements for suppressing or influencing the differential action, e.g. locking devices
    • F16H48/30—Arrangements for suppressing or influencing the differential action, e.g. locking devices using externally-actuatable means
    • F16H48/34—Arrangements for suppressing or influencing the differential action, e.g. locking devices using externally-actuatable means using electromagnetic or electric actuators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • 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
    • B60L2220/40—Electrical machine applications
    • B60L2220/44—Wheel Hub motors, i.e. integrated in the wheel hub
    • 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
    • B60L2240/10—Vehicle control parameters
    • B60L2240/36—Temperature of vehicle components or parts
    • 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
    • B60L2240/423—Torque
    • 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
    • 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
    • B60L2260/00—Operating Modes
    • B60L2260/20—Drive modes; Transition between modes
    • B60L2260/28—Four wheel or all wheel drive
    • 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
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/08—Electric propulsion units
    • B60W2510/087—Temperature
    • 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
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/08—Electric propulsion units
    • B60W2710/083—Torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B60W2720/00—Output or target parameters relating to overall vehicle dynamics
    • B60W2720/40—Torque distribution
    • B60W2720/406—Torque distribution between left and right wheel
    • 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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
    • F16H2001/325—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear comprising a carrier with pins guiding at least one orbital gear with circular holes
    • 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
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    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
    • 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
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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
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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
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    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19642—Directly cooperating gears

Definitions

  • the present invention relates to a motor driving force transmission device which is preferably used in an electric vehicle having, for example, an electric motor as a drive source.
  • driving force transmission devices that include an electric motor which produces a motor driving force and a speed reduction and transmission mechanism for transmitting the motor driving force of the electric motor to a differential mechanism, which are installed in a motor vehicle (refer to Patent Literature 1, for example).
  • the electric motor has an output shaft that rotates based on electric power of an onboard battery and which is disposed on one side of the differential mechanism.
  • the speed reduction and transmission mechanism includes two speed reducing gear sets and is connected to the electric motor and the differential mechanism.
  • the first speed reducing gear set is connected to the output shaft of the electric motor, and the second speed reducing gear set is connected to a differential case of the differential mechanism.
  • the output shaft of the electric motor rotates based on the electric power of the onboard battery, and in association with the rotation of the electric motor, the motor driving force is transmitted from the electric motor to the differential mechanism via the speed reduction and transmission mechanism. Then, the motor driving force transmitted to the differential mechanism is delivered to left and right wheels from the differential mechanism.
  • Patent Literature 1 JP-A-2004-17807
  • an object of the invention is to provide a motor driving force transmission device which can restrain an electric motor from being heated excessively as a result of a long-time continuous operation thereof, thereby enabling the device to be used continuously.
  • the invention provides a motor driving force transmission device which will be described under (1) to (3).
  • a motor driving force transmission device comprising a speed reduction and transmission mechanism which is configured to transmit at least one of a first motor driving force and a second motor driving force to a differential mechanism, a first electric motor which is connected to the differential mechanism via the speed reduction and transmission mechanism and which is configured to produce the first motor driving force, a second electric motor which is connected to the first electric motor and the speed reduction and transmission mechanism and which is configured to produce the second motor driving force, and a control unit which is configured to output control signals to control the second electric motor and the first electric motor, wherein the control unit outputs a control signal to drive both the first electric motor and the second electric motor when a driving torque for the differential mechanism is equal to or larger than a predetermined torque and outputs a control signal to drive alternately the first electric motor and the second electric motor when the driving torque for the differential mechanism is smaller than the predetermined torque.
  • the speed reduction and transmission mechanism includes: a pair of eccentric cams which are configured to rotate as at least one of the first electric motor and the second electric motor is driven; and a pair of transmission members which are configured to rotate as the pair of eccentric cams rotate, the pair of transmission members being connected to the differential mechanism at portions which are spaced apart from each other at equal intervals around a rotational axis of the differential mechanism.
  • the first electric motor and the second electric motor each include a stator and a rotor, and the stators are connected to each other by a first connecting member through which the pair of transmission members are inserted and the rotors are connected to each other on an outer circumference of the stators by a second connecting member.
  • FIG. 1 is a plan view shown to schematically illustrate a vehicle in which a motor driving force transmission device according to a first embodiment of the invention is installed.
  • FIG. 2 is a sectional view shown to illustrate the motor driving force transmission device according to the first embodiment of the invention.
  • FIG. 3 is a sectional view (a sectional view taken along the line A-A in FIG. 2 ) showing a speed reduction and transmission mechanism of the motor driving force transmission device according to the first embodiment of the invention.
  • FIG. 4 is a sectional view showing an operating state of the speed reduction and transmission mechanism of the motor driving force transmission device according to the first embodiment of the invention.
  • FIG. 5 is a block diagram shown to illustrate the motor driving force transmission device according to the first embodiment of the invention.
  • FIG. 6 is a graph shown to illustrate an advantage of a countermeasure against heat taken in the motor driving force transmission device according to the first embodiment of the invention.
  • FIG. 7 is a sectional view showing a motor driving force transmission device according to a second embodiment of the invention.
  • FIG. 8 is a sectional view showing an operating state of a speed reduction and transmission mechanism of the motor driving force transmission device according to the second embodiment of the invention.
  • FIG. 1 shows schematically a four-wheel-drive vehicle.
  • a four-wheel-drive vehicle 101 employs a front drive line system related with front wheels which employs an engine as a drive source and a rear drive line system related with rear wheels which employs an electric motor as a drive source and includes a motor driving force transmission device 1 , an engine 102 , a transaxle 103 , a pair of front wheels 104 , and a pair of rear wheels 105 .
  • the motor driving force transmission device 1 is disposed in the rear drive line system of the four-wheel-drive vehicle 101 and is supported together with a rear differential 107 on a vehicle body (not shown) of the four-wheel-drive vehicle 101 via a differential carrier 106 .
  • the motor driving force transmission device 1 is designed to transmit a motor driving force of an electric motor (which will be described later) to the pair of rear wheels 105 .
  • This configuration enables the motor driving force of the electric motor to be outputted to rear axle shafts 108 via the motor driving force transmission device 1 and the rear differential 107 , whereby the pair of rear wheels 105 are driven.
  • the motor driving force transmission device 1 will be described in detail later.
  • the engine 102 is disposed in the front drive line system of the four-wheel-drive vehicle 101 . This configuration allows a driving force of the engine 102 to be outputted to front axle shafts 109 via the transaxle 103 , whereby the pair of front wheels 104 are driven.
  • FIG. 2 shows the whole of the motor driving force transmission device.
  • the motor driving force transmission device 1 substantially includes a speed reduction and transmission mechanism 2 which transmits at least one motor driving force of a first motor driving force a and a second motor driving force b (both of which are shown in FIG. 5 ) to the rear differential 107 , a first electric motor 3 which produces the first motor driving force a, a second electric motor 4 which produces the second motor driving force b, and a vehicle ECU (Electronic Control Unit) 5 which functions as a control unit for outputting control signals which control the first electric motor 3 and the second electric motor 4 .
  • a speed reduction and transmission mechanism 2 which transmits at least one motor driving force of a first motor driving force a and a second motor driving force b (both of which are shown in FIG. 5 ) to the rear differential 107 , a first electric motor 3 which produces the first motor driving force a, a second electric motor 4 which produces the second motor driving force b, and a vehicle ECU (Electronic Control Unit
  • the rear differential 107 is made up of a differential mechanism of a bevel gear type having a differential case (an input member) 110 , a pinion gear shaft 111 , a pair of pinion gears 112 and a pair of side gears 113 and is accommodated within the differential carrier 106 .
  • a rotational force of the differential case 110 is delivered from the pinion gear shaft 111 to the side gears 113 via the pinion gears 112 and is further transmitted to the left and right rear wheels 105 from the rear axle shafts 108 .
  • the differential case 110 has an accommodating space 110 a and shaft insertion holes 110 b in an interior thereof and is disposed rotatably within the differential carrier 106 via tapered roller bearings 114 . Additionally, the differential case 110 is designed to rotate around a rotational axis O when receiving at least one motor driving force of the first motor driving force a and the second motor driving force b.
  • An external gear 110 c which has an involute tooth profile and employs the rotational axis O as a gear axis thereof is mounted on the differential case 110 .
  • the pinion gear shaft 111 is disposed on an axis L which intersects the rotational axis O at right angles within the accommodating space 110 a in the differential case 110 and is restricted from rotating around the axis L.
  • the pair of pinion gears 112 are supported rotatably on the pinion gear shaft 111 and are accommodated in the accommodating space 110 a in the differential case 110 .
  • the pair of side gears 113 are accommodated within the accommodating space 110 a in the differential case 110 and are connected to the rear axle shafts 108 which pass through the shaft insertion holes 110 b through spline fitting. Additionally, the pair of side gears 113 are disposed so that their gear axes intersect gear axes of the pair of pinion gears 112 at right angles so as to mesh with the pair of pinion gears 112 .
  • FIGS. 3 and 4 show the speed reduction and transmission mechanism.
  • the speed reduction and transmission mechanism 2 has a pair of eccentric cams 6 , 7 which rotate as the first electric motor 3 and the second electric motor 4 (both of which are shown in FIG. 2 ) are driven and a pair of transmission members 8 , 9 which oscillate as the pair of eccentric cams 6 , 7 rotate and is disposed on an outer circumference of the rear differential 107 while being interposed between the first electric motor 3 and the second electric motor 4 on the rotational axis O (shown in FIG. 2 ).
  • the pair of eccentric cams 6 , 7 are disposed in line on the rotational axis O and are formed integrally on an inner circumferential surface of a second connecting member (a connecting cylinder) 10 .
  • the eccentric cam 6 is designed to cause the transmission member 8 to perform a circular motion which deviates a deviation amount ⁇ from the rotational center O when receiving at least one motor driving force of the first motor driving force a and the second motor driving force b.
  • the transmission member 8 oscillates so that the axis O1thereof moves in a direction indicated by an arrow n1 about the rotational axis O.
  • the transmission member 8 oscillates so that the axis O1 thereof moves in a direction indicated by an arrow n2 (an opposite direction to the direction indicated by the arrow n1) about the rotational axis O.
  • the transmission member 8 moves the axis O1 along a circumferential direction of a circle that is centered at the rotational axis O and which has a radius equal to the deviation amount ⁇ and revolves without rotating one full rotation relative to the differential carrier (the device main body) 106 .
  • the other eccentric cam 7 is designed to cause the transmission member 9 to perform a circular motion which deviates the deviation amount ⁇ from the rotational center O when receiving at least one motor driving force of the first motor driving force a and the second motor driving force b.
  • the transmission member 9 oscillates so that the axis O2 thereof moves in the direction indicated by the arrow n1 about the rotational axis O.
  • the transmission member 9 oscillates so that the axis O2 thereof moves in the direction indicated by the arrow n2 (the opposite direction to the direction indicated by the arrow n1) about the rotational axis O.
  • the transmission member 9 moves the axis O2 along a circumferential direction of a circle that is centered at the rotational axis O and which has a radius equal to the deviation amount ⁇ and revolves without rotating one full rotation relative to the differential carrier (the device main body) 106 .
  • the pair of transmission members 8 , 9 are made up of internal gears which mesh with the external gear 110 c of the differential case 110 , are disposed in line on the rotational axis O and are connected to the external gear 110 c at portions which are spaced apart from each other at equal intervals)(180° around the rotational axis (the rotational axis O) of the external gear 110 c.
  • the speed reduction and transmission mechanism 2 is connected to the differential 107 in a well-balanced fashion.
  • Internal gears having an involute tooth profile are employed for the pair of transmission members 8 , 9 which have a larger number of teeth than the number of teeth of the external gear 110 c and which are in mesh with the external gars 110 c having the involute tooth profile at all times.
  • the transmission member 8 which is one of the pair of transmission members, is disposed rotatably on an inner surface of the eccentric cam 6 , which is one of the pair of eccentric cams, via a needle roller bearing 12 .
  • a plurality of pin insertion holes 8 a are disposed in the transmission member 8 at equal intervals in a circumferential direction thereof so that a plurality of first connecting members (connecting pins) 11 are inserted therethrough, each pin insertion hole 8 a having a bore diameter which is larger than a dimension resulting from adding the deviation amount ⁇ to a pin diameter of each connecting pin 11 .
  • the transmission member 9 which is the other of the pair of transmission members, is disposed rotatably on an inner surface of the eccentric cam 7 , which is the other of the pair of eccentric cams, via a needle roller bearing 12 .
  • a plurality of pin insertion holes 9 a are disposed in the other transmission member 9 at equal intervals in a circumferential direction thereof so that the plurality of connecting pins 11 are inserted therethrough, each pin insertion hole 9 a having a bore diameter which is larger than the dimension resulting from adding the deviation amount ⁇ to the pin diameter of each connecting pin 11 .
  • FIG. 5 shows a control system of the speed reduction and transmission mechanism.
  • the first electric motor 3 has a stator 3 a and a rotor 3 b (both of which are shown in FIG. 2 ) and is connected to the differential 107 via the speed reduction and transmission mechanism 2 on the rotational axis O (shown in FIG. 2 ), and the stator 3 a is connected to the ECU 5 .
  • the first electric motor 3 is configured so that when a control signal is inputted thereinto from the ECU 5 , the stator 3 a produces the first motor driving force a for operating the differential 107 between the rotor 3 b and itself so as to rotate the rotor 3 b.
  • the stator 3 a has coils (not shown) which receive electric power supplied from an onboard battery (not shown) and is disposed on an inner circumferential side of the first electric motor 3 .
  • the rotor 3 b includes magnets having magnetic poles in the circumferential direction and is disposed on an outer circumferential side of the first electric motor 3 .
  • the second electric motor 4 has a stator 4 a and a rotor 4 b (both of which are shown in FIG. 2 ) and is connected to the differential 107 via the speed reduction and transmission mechanism 2 on the rotational axis O (shown in FIG. 2 ), and the stator 4 a is connected to the ECU 5 . Additionally, the first electric motor 4 is configured so that when a control signal is inputted thereinto from the ECU 5 , the stator 4 a produces the second motor driving force b for operating the differential 107 between the rotor 4 b and itself so as to rotate the rotor 4 b.
  • the stator 4 a has coils (not shown) which receive electric power supplied from the onboard battery (not shown), is disposed on an inner circumferential side of the second electric motor 4 , and are connected to the stator 3 a of the first electric motor 3 via the plurality of connecting pins 11 .
  • the rotor 4 b includes magnets having magnetic poles in the circumferential direction, is disposed on an outer circumferential side of the second electric motor 4 , and is connected to the rotor 3 b of the first electric motor 3 via the connecting cylinder 10 .
  • the ECU 5 is connected to a sensor (not shown) in addition to the first electric motor 3 and the second electric motor 4 . Additionally, when a detection signal is inputted thereinto which signals that a driving torque which is smaller than a predetermined torque is required for the rear differential 107 , the ECU 5 outputs a control signal to drive alternately the first electric motor 3 and the second electric motor 4 , while the detection signal signals that a driving torque which is equal to or larger than the predetermined torque is required for the rear differential 107 , the ECU 5 outputs a control signal to drive both the first electric motor 3 and the second electric motor 4 .
  • the ECU 5 puts the four-wheel-drive vehicle 101 in a four-wheel-drive state based on the front drive line system and the rear drive line system by not only operating the rear drive line system by driving at least one electric motor of the first electric motor 3 and the second electric motor 4 but also driving the front wheels 104 by the engine 102 .
  • the ECU 5 puts the four-wheel-drive vehicle 101 in a two-wheel-drive state by stopping the operation of the rear drive line system by stopping the driving of the first electric motor 3 and the second electric motor 4 during the normal running of the four wheel-drive vehicle 101 while allowing the engine 102 to drive the front wheels 104 .
  • FIG. 6 shows a relation between electric motor continuous operable time and motor phase current.
  • the eccentric cams 6 , 7 rotate, for example, in the direction indicated by the arrow ml, and the transmission members 8 , 9 perform circular motions in the direction indicated by the arrow n1 while sliding on each other with the transmission members 8 , 9 each deviating the deviation amount ⁇ from the rotation axis O.
  • the first motor driving force a is transmitted from the transmission members 8 , 9 to the external gear 110 c of the rear differential 107 (shown in FIG. 1 ), whereby the external gear 110 c rotates in the opposite direction (the direction indicated by the arrow m2) to the rotating direction of the eccentric cams 6 , 7 .
  • the motor driving force transmission device 1 to continue to operate when the driving torque which is smaller than the predetermined torque is required for the rear differential 107 , when a predetermined period of time during which the first electric motor 3 is to be driven continuously elapses, the supply of electric power to the first electric motor 3 is stopped, and the second electric motor 4 , which is the other electric motor, is driven.
  • the first electric motor 3 is heated excessively in case the supply of electric power to the first electric motor 3 still continues even after the predetermined period of time elapses.
  • the first electric motor 3 is prevented from being heated excessively by stopping the supply of electric power to the first electric motor 3 .
  • FIG. 6 shows results A to F of an analysis of the relation between the time during which the electric motor can be operated continuously and the current supplied to the electric motor. According to the graph, it is possible to determine specific electric motor continuous operable periods of time according to magnitudes of electric currents supplied to the electric motor.
  • an axis of ordinates represents electric motor continuous operable time
  • an axis of abscissas represents electric current supplied to the electric motor.
  • the second electric motor 4 when the second electric motor 4 is driven by supplying electric power to the second electric motor 4 , the second motor driving force b of the second electric motor 4 is imparted to the speed reduction and transmission mechanism 2 via the connecting cylinder 10 , whereby the speed reduction and transmission mechanism 2 is actuated. Because of this, in a similar way to the way in which the first electric motor 4 is driven, the second motor driving force b is transmitted to the differential 107 via the speed reduction and transmission mechanism 2 . This actuates the differential 107 , and the second motor driving force b is delivered to the rear axle shafts 108 to thereby be transmitted to the left and right rear wheels 105 .
  • the motor driving force transmission device 1 to continue to operate when the driving torque which is smaller than the predetermined torque is required for the rear differential 107 , when a predetermined period of time during which the second electric motor 4 is to be driven continuously elapses, the supply of electric power to the second electric motor 4 is stopped, and the first electric motor 3 is driven.
  • the first electric motor 3 and the second electric motor 4 are driven alternately to thereby restrain the first electric motor 3 and the second electric motor 4 from being heated excessively, thereby making it possible to allow the motor driving force transmission device 1 to operate continuously.
  • the motor driving force transmission device 1 can also be actuated in a similar way to the way described in this embodiment even by rotating the eccentric cams 6 , 7 in the direction indicated by the arrow m2. As this occurs, the external gear 110 c rotates in the opposite direction (the direction indicated by the arrow m1) to the rotating direction of the eccentric cams 6 , 7 .
  • the invention is not limited thereto.
  • the driving torque which is equal to or larger than the predetermined torque is required for the rear differential 107 , it is possible to transmit a motor driving force which is larger than the first motor driving force a or the second motor driving force b from the speed reduction and transmission mechanism 2 to the rear differential 107 by driving both the first electric motor 3 and the second electric motor 4 .
  • the first electric motor 3 and the second electric motor 4 can be restrained from being heated excessively as a result of the continuous operation of the motor driving force transmission device 1 over a long period of time, whereby the motor driving force transmission device 1 can be used continuously by using the first electric motor 3 and the second electric motor 4 alternately.
  • the speed reduction and transmission mechanism 2 , the first electric motor 3 and the second electric motor 4 are disposed on the rotational axis O, whereby the radial dimension of the motor driving force transmission device 1 can be reduced, thereby making it possible to realize a reduction in size of the same device as a whole.
  • FIGS. 7 and 8 show a speed reduction and transmission mechanism.
  • like reference numerals will be given to members which have the same or similar functions to those shown in FIGS. 3 and 4 , and the detailed description thereof will be omitted here.
  • a speed reduction and transmission mechanism 71 of a motor driving force transmission device is characterized in that a pair of transmission members 72 , 73 are formed of internal gears having a cycloid tooth profile.
  • an external gear 110 c of a differential case 110 of a differential 107 is formed of an external gear having a cycloid tooth profile that has a smaller number of teeth than those of the pair of transmission members 72 , 73 and which is normally in mesh with the pair of transmission members 72 , 73 .
  • the pair of transmission members 72 , 73 are disposed in line on a rotational axis O (shown in FIG. 2 ) and are connected to the external gear 110 c at portions which are spaced 180° apart from each other around the rotational axis (the rotational axis O) thereof.
  • the motor driving force transmission device configured in the way described above, similar to the motor driving force transmission device 1 described in the first embodiment, by driving alternately a first electric motor 3 and a second electric motor 4 , the first electric motor 3 and the second electric motor 4 can be restrained from being heated excessively, whereby the motor driving force transmission device 1 can be operated continuously.
  • the invention is not limited thereto.
  • the electric motors may be switched to be driven when the integral value of the motor current of the first electric motor 3 or the second electric motor 4 reaches or exceeds a predetermined threshold.
  • the electric motors may be switched to be driven when the temperature of the first electric motor 3 or the second electric motor 4 reaches or exceeds a predetermined threshold.
  • 1 motor driving force transmission device 2 speed reduction and transmission mechanism; 3 first electric motor; 3 a stator; 3 b rotor; 4 second electric motor; 4 a stator; 4 b rotor; 5 ECU; 6 , 7 eccentric cam; 8 , 9 transmission member; 10 connecting cylinder; 11 connecting pin; 12 needle roller bearing; 71 speed reduction and transmission mechanism; 72 , 73 transmission member; 101 four-wheel-drive vehicle; 102 engine; 103 transaxle; 104 front wheel; 105 rear wheel; 106 differential carrier; 107 rear differential; 108 rear axle shaft; 109 front axle shaft; 110 differential case; 110 a accommodating space; 110 b shaft insertion hole; 110 c external gear; 111 pinion gear shaft; 112 pinion gear; 113 side gear; 114 tapered roller bearing; a first motor driving force, b second motor driving force; O rotational axis; L axis; ⁇ deviation amount.

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JP2011-003349 2011-01-11
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JP2011073852A JP5741128B2 (ja) 2011-03-30 2011-03-30 インホイールモータ駆動装置
JP2011-256577 2011-11-24
JP2011256577 2011-11-24
JP2011280033A JP2013129311A (ja) 2011-02-17 2011-12-21 モータ駆動力伝達装置
JP2011-280033 2011-12-21
PCT/JP2012/050383 WO2012096308A1 (fr) 2011-01-11 2012-01-11 Dispositif de transmission de force d'entraînement de moteur

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EP2664487A4 (fr) 2018-01-24
EP2665160A1 (fr) 2013-11-20
WO2012096309A1 (fr) 2012-07-19
WO2012096310A1 (fr) 2012-07-19
WO2012096308A1 (fr) 2012-07-19
CN103298647A (zh) 2013-09-11
EP2664487A1 (fr) 2013-11-20
CN103299516A (zh) 2013-09-11
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US20130283950A1 (en) 2013-10-31
EP2664486A1 (fr) 2013-11-20

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