# US 6,719,656 B2 · Drivetrain with hybrid transfer case > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,719,656 B2 - Document ID: US6719656B2 - Status: Granted - Kind: B2 - Application number: 10/349,472 - Filed: 2003-01-22 - Published: 2003-08-07 - Granted: 2004-04-13 - Earliest claimed: 2001-10-19 - Assignees: New Venture Gear, Inc. - Inventors: Thomas C. Bowen - Web page: https://patentgrep.com/patent/US6719656B2 ## CPC - B60L 58/12: responding to state of charge [SoC] - B60K 6/26: characterised by the motors or the generators - B60K 6/365: with the gears having orbital motion - B60K 6/387: Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means - B60K 6/405: Housings - B60K 6/48: Parallel type - B60K 6/52: Driving a plurality of drive axles, e.g. four-wheel drive - B60K 6/54: Transmission for changing ratio - B60K 17/34: for driving both front and rear wheels, e.g. four wheel drive vehicles - B60K 23/08: for changing number of driven wheels {, for switching from driving one axle to driving two or more axles (B60K17/3515 takes precedence)} - B60L 1/003: {to auxiliary motors, e.g. for pumps, compressors} - B60L 7/14: for vehicles propelled by AC motors - B60L 15/2009: {for braking} - B60L 50/16: with provision for separate direct mechanical propulsion - B60W 10/02: including control of driveline clutches - B60W 10/08: including control of electric propulsion units, e.g. motors or generators - B60W 10/10: including control of change-speed gearings - B60W 20/40: Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers {(power-up or power-down of the driveline B60W30/192)} - F16H 3/725: {with means to change ratio in the mechanical gearing} - H02K 7/006: {Structural association of a motor or generator with the drive train of a motor vehicle} - B60L 2240/12: Speed - B60L 2240/421: Speed - B60L 2240/423: Torque - B60L 2240/441: Speed - B60L 2240/443: Torque - B60L 2240/461: Speed - B60L 2240/545: Temperature - B60L 2240/547: Voltage - B60L 2240/549: Current - B60L 2250/24: by lever actuation - B60L 2250/26: by pedal actuation - B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} - Y02T 10/62: Hybrid vehicles - Y02T 10/64: Electric machine technologies in electromobility - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 10/72: Electric energy management in electromobility - Y10S 903/906: Motor or generator - Y10S 903/91: Orbital, e.g. planetary gears - Y10S 903/914: Actuated, e.g. engaged or disengaged by electrical, hydraulic or mechanical means - Y10S 903/916: with plurality of drive axles - Y10S 903/917: with transmission for changing gear ratio - Y10S 903/945: Characterized by control of gearing, e.g. control of transmission ratio - Y10S 903/946: Characterized by control of driveline clutch - Y10S 903/952: Housing details - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - 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 - 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 - F16H: GEARING - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A hybrid transfer case includes a mainshaft, front and rear output shafts, an electric motor/generator connected to the mainshaft, and an input clutch for selectively coupling the transmission to the mainshaft. The transfer case further includes a planetary gearset having a sun gear driven by the mainshaft, a ring gear, and planet gears supported from a carrier. The carrier drives the rear output shaft and a transfer assembly couple to the front output shaft. A direct clutch is operable to selectively coupled the carrier for rotation with the mainshaft. A low brake is operable to selectively brake rotation of the ring gear. A transfer clutch controls the amount of drive torque delivered through the transfer assembly to the front output shaft. A hybrid control system is provided for controlling actuation of the various clutch and brake assemblies and the electric motor/generator to establish various drive modes. ## Claims ### Claim 1 A transfer case for use in a hybrid motor vehicle having an engine and first and second drivelines, comprising: an input shaft adapted to be driven by the engine; a mainshaft; a first clutch for selectively coupling said input shaft to said mainshaft; a first output shaft adapted for connection to the first driveline; a second output shaft adapted for connection to the second driveline; a planetary gearset having a sun gear driven by said mainshaft, a ring gear, and planet gears rotatably supported from a carrier and which are meshed with said sun gear and said ring gear, said carrier operably connected to said first and second output shafts; a second clutch for selectively coupling said mainshaft to said carrier; a third clutch for selectively coupling said ring gear to a stationary member; and an electric motor for selectively driving said mainshaft. ### Claim 2 (depends on 1) The transfer case of claim 1 wherein said first clutch is operable in a released state to release said mainshaft from driven engagement with said input shaft and is further operable in an applied state to couple said mainshaft for rotation with said input shaft, wherein said second clutch is operable in a released state to permit relative rotation between said carrier and said mainshaft and is further operable in an applied state to couple said carrier for rotation with said mainshaft, and wherein said third clutch is operable in a released state to permit rotation of said ring gear and is further operable in an applied state to couple said ring gear to said stationary member. ### Claim 3 (depends on 2) The transfer case of claim 2 wherein a high-range drive connection is established between said mainshaft and said carrier when said second clutch is operating in its applied state and said third clutch is in its released state, and wherein a low-range drive connection is established between said mainshaft and said carrier when said second clutch is in its released state and said third clutch is in its applied state. ### Claim 4 (depends on 2) The transfer case of claim 2 wherein a hybrid four-wheel high-range drive mode is established when said first and second clutches are applied, said third clutch is released, and said electric motor is actuated such that drive torque generated by said electric motor is combined with drive torque from the engine to drive said mainshaft. ### Claim 5 (depends on 2) The transfer case of claim 2 wherein an engine four-wheel high-range drive mode is established when said first and second clutches are applied, said third clutch is released and said electric motor is off such that drive torque generated by the engine drives said mainshaft. ### Claim 6 (depends on 2) The transfer case of claim 2 wherein an electric four-wheel high-range drive mode is established when said first and third clutches are released, said second clutch is applied and said electric motor is activated to drive said mainshaft. ### Claim 7 (depends on 2) The transfer case of claim 2 further comprising a fourth clutch for selectively coupling said carrier to said second output shaft, said fourth clutch is operable in a released state to define a two-wheel drive mode, said fourth clutch is further operable in an applied state to define a four-wheel drive mode. ### Claim 8 (depends on 7) The transfer case of claim 7 wherein an electric two-wheel high-range drive mode is established when said first, third and fourth clutches are released, said second clutch is applied, and said electric motor is actuated to drive said mainshaft. ### Claim 9 (depends on 7) The transfer case of claim 7 wherein a hybrid two-wheel high-range drive mode is established when said first and second clutches are applied, said third and fourth clutches are released, and said electric motor is actuated such that drive torque generated by said electric motor is combined with drive torque from the engine to drive said mainshaft. ### Claim 10 (depends on 7) The transfer case of claim 7 wherein an engine two-wheel high-range drive mode is established when said first and second clutches are applied, said third and fourth clutches are released, and said electric motor is off such that drive torque generated by the engine drives said mainshaft. ### Claim 11 (depends on 7) The transfer case of claim 7 wherein an electric two-wheel low-range drive mode is established when said first, second and fourth clutches are released, said third clutch is applied, and said electric motor is activated to drive said mainshaft. ### Claim 12 (depends on 7) The transfer case of claim 7 wherein a hybrid two wheel low-range drive mode is established when said first clutch is applied, said second clutch is released, said third clutch is applied, said fourth clutch is released, and said electric motor is actuated such that drive torque generated by said electric motor is combined with drive torque from the engine to drive said mainshaft. ### Claim 13 (depends on 7) The transfer case of claim 7 wherein an engine two-wheel low-range drive mode is established when said first clutch is applied, said second clutch is released, said third clutch is applied, said fourth clutch is released, and said electric motor is off such that drive torque generated by the engine drives said mainshaft. ### Claim 14 (depends on 7) The transfer case of claim 7 wherein said fourth clutch can be fully engaged to define a locked four-wheel drive mode or actuation of said fourth clutch can be varied to define an on-demand four-wheel drive mode. ### Claim 15 (depends on 1) The transfer case of claim 1 wherein said first clutch is a spring-apply multi-plate clutch assembly operable disposed between said input shaft and said mainshaft, said first clutch is normally operable in its applied state and can be selectively shifted into its released state via actuation of a first power-operated actuator, wherein said second clutch is a spring-apply multi-plate clutch assembly operably disposed between said mainshaft and said carrier, said second clutch is normally operable in its applied state and can be selectively shifted into its released state via actuation of a second power-operated actuator, and wherein said third clutch is a spring-release multi-plate brake assembly operably disposed between said ring gear and a stationary member, said third clutch is normally operable in its released state and can be selectively shifted into its applied state via actuation of said second power-operated actuator. ### Claim 16 (depends on 15) The transfer case of claim 15 further comprising a control system having a controller and sensors for detecting operating characteristics of the vehicle and sending sensor signals to said controller, said controller operable to send control signals to said electric motor and said first and second actuators for controlling coordinated actuation thereof. ### Claim 17 (depends on 1) The transfer case of claim 1 further comprising a control system for controlling coordinate actuation of said first, second and third clutches and activation of said electric motor. ### Claim 18 (depends on 1) The transfer case of claim 1 wherein said electric motor includes a stator secured to a housing and a rotor secured to said mainshaft. ### Claim 19 (depends on 1) The transfer case of claim 1 further comprising: a valvebody supporting a first electrohydraulic control valve controlling actuation of said first clutch, a second electrohydraulic control valve controlling actuation of said second clutch, and a third electrohydraulic control valve controlling actuation of said third clutch; and a hydraulic circuit providing high pressure fluid to said first, second and third control valves. ### Claim 20 A transfer case for use in a four-wheel drive motor vehicle having an engine and front and rear drivelines, comprising: an input shaft adapted to be driven by the engine; a mainshaft driving a reduction unit having an output member; a first clutch for selectively coupling said input shaft to said mainshaft; a rear output shaft driven by said output member and adapted for connection to the rear driveline; a front output shaft driven by said output member and adapted for connection to the front driveline; a second clutch operable in a first mode to establish a high-range drive connection between said mainshaft and said output member and in a second mode to establish a low-range drive connection therebetween; and an electric motor for selectively driving said mainshaft. ### Claim 21 (depends on 20) The transfer case of claim 20 wherein a hybrid four-wheel high-range drive mode is established when said first clutch couples said input shaft to said mainshaft, said second clutch is operating in its first mode, and said electric motor is activated such that said mainshaft is driven by said electric motor and the engine. ### Claim 22 (depends on 20) The transfer case of claim 20 wherein an electric four wheel high-range drive mode is established when said first clutch uncouples said mainshaft from said input shaft, said second clutch is operating in its first mode, and said electric motor is activated so as to drive said mainshaft. ### Claim 23 (depends on 20) The transfer case of claim 20 wherein an engine four-wheel high-range drive mode is established when said first clutch couples said input shaft to said mainshaft, said second clutch is operating in its first mode, and said electric motor is off such that the engine drives said mainshaft. ### Claim 24 (depends on 20) The transfer case of claim 20 wherein a hybrid four-wheel low-range drive mode is established when said first clutch couples said input shaft to said mainshaft, said second clutch is operating in its first mode, and said electric motor is activated such that said mainshaft is driven by said electric motor and the engine. ### Claim 25 The transfer case of 20 wherein an electric four-wheel low-range drive mode is established when said first clutch uncouples said mainshaft from said input shaft, said second clutch is operating in its first mode, and said electric motor is activated so as to drive said mainshaft. ### Claim 26 (depends on 20) The transfer case of claim 20 wherein an engine four wheel high-range drive mode is established when said first clutch couples said input shaft to said mainshaft, said second clutch is operating in its first mode, and said electric motor is off such that the engine drives said mainshaft. ### Claim 27 (depends on 20) The transfer case of claim 20 wherein said reduction unit further includes a reaction member driven by said output member, and wherein said second clutch includes a direct clutch assembly that is operable for selectively coupling said output member for rotation with said mainshaft and a low brake assembly that is operable for selectively braking rotation of said reduction member, whereby said first mode of said second clutch is established when said direct clutch assembly is engaged and said low brake assembly is released, and said second mode of said second clutch is established when said direct clutch assembly is released and said low brake assembly is engaged. ### Claim 28 (depends on 27) The transfer case of claim 27 when said reduction unit is a planetary gearset with a sun gear driven by said mainshaft, a ring gear as its reaction member, and planet gears meshed with said sun gear and ring gear that are supported from a carrier as its output member. ### Claim 29 (depends on 28) The transfer case of claim 28 wherein said first clutch is operable in a released state to release said mainshaft from driven engagement with said input shaft and is further operable in an applied state to couple said mainshaft for rotation with said input shaft, wherein said direct clutch assembly is operable in a released state to permit relative rotation between said carrier and said mainshaft and is further operable in an applied state to couple said carrier for rotation with said mainshaft, and wherein said low brake assembly is operable in a released state to permit rotation of said ring gear and is further operable in an applied state to brake said ring gear against rotation. ### Claim 30 (depends on 20) The transfer case of claim 20 further comprising a third clutch for selectively coupling said output member of said reduction unit to said front output shaft, said third clutch is operable in a first mode to establish a two-wheel drive mode wherein all drive torque is transferred to the rear driveline through said rear output shaft, said third clutch is further operable in a second mode to establish a four-wheel drive mode wherein at least a portion of the drive torque is transferred to the front driveline through said front output shaft. ### Claim 31 A hybrid motor vehicle, comprising: a powertrain including an internal combustion engine and a transmission; a first driveline including a first axle driving a pair of first wheels; a second driveline including a second axle driving a pair of second wheels; a transfer case including an input shaft driven by said powertrain, a mainshaft driven by said input shaft, a first output shaft operably connected to said first driveline, a second output shaft operably connected to said second driveline, a planetary reduction unit having a sun gear driven by said mainshaft, a ring gear and planet gears meshed with said sun and ring gears, said planet gears rotatably supported from a carrier which operably drives said first and second output shafts, a direct clutch for selectively coupling said mainshaft to said carrier, a low brake for selectively braking rotation of said ring gear, and an electric motor for driving said mainshaft; and a control system for controlling actuation of said direct clutch, said low brake and said electric motor for defining a hybrid drive mode and an engine drive mode. ### Claim 32 (depends on 31) The hybrid motor vehicle of claim 31 wherein a hybrid four-wheel high-range drive mode is established when said direct clutch is applied, said low brake is released, and drive torque generated by said electric motor is combined with drive torque from the powertrain to drive said mainshaft. ### Claim 33 (depends on 31) The hybrid motor vehicle of claim 31 wherein an engine four-wheel high-range drive mode is established when said direct clutch is applied, said low brake is released, and said electric motor is off such that drive torque generated by the powertrain drives said mainshaft. ### Claim 34 (depends on 31) The hybrid motor vehicle of claim 31 wherein a hybrid four-wheel low-range drive mode is established when said direct clutch is released, said low brake is applied, and drive torque generated by said electric motor is combined with drive torque from the powertrain to drive said mainshaft. ### Claim 35 (depends on 31) The hybrid motor vehicle of claim 31 wherein an engine four-wheel low-range drive mode is established when said direct clutch is released, said low brake is applied, and said electric motor is off such that drive torque generated by the engine drives said mainshaft. ### Claim 36 (depends on 31) The transfer case of claim 31 further comprising: an input clutch for selectively coupling said input shaft to said mainshaft; and a transfer clutch for selectively coupling said carrier to said second output shaft; wherein said control system is operable for controlling actuation of said input clutch and transfer clutch. ### Claim 37 (depends on 36) The hybrid motor vehicle of claim 36 wherein an electric four-wheel high-range drive mode is established when said input clutch is released, said direct clutch is applied, said low brake is released, and said electric motor is activated to drive said mainshaft. ### Claim 38 (depends on 36) The hybrid motor vehicle of claim 36 wherein said input clutch is operable in a released state to release said mainshaft from driven engagement with said input shaft and is further operable in an applied state to couple said mainshaft for rotation with said input shaft, wherein said direct clutch is operable in a released state to permit relative rotation between said carrier and said mainshaft and is further operable in an applied state to couple said carrier for rotation with said mainshaft, and wherein said low brake is operable in a released state to permit rotation of said ring gear and is further operable in an applied state to brake said ring gear against rotation. ### Claim 39 (depends on 38) The hybrid motor vehicle of claim 38 wherein a high-range drive connection is established between said mainshaft and said carrier when said direct clutch is operating in its applied state and said low brake is in its released state, and wherein a low-range drive connection is established between said mainshaft and said carrier when said direct clutch is in its released state and said low brake is in its applied state. ### Claim 40 (depends on 39) The hybrid motor vehicle of claim 39 wherein said transfer clutch is operable in a released state such that all drive torque is transferred from said carrier to said first output shaft to define a two-wheel drive mode, said transfer clutch is further operable in an applied state such that drive torque is transferred from said carrier to both of said first and second output shafts to define a four-wheel drive mode. ### Claim 41 (depends on 40) The hybrid motor vehicle of claim 40 wherein an electric two-wheel high-range drive mode is established when said input clutch is released, said direct clutch is applied, said low brake is released, said transfer clutch is released and said electric motor is actuated to drive said mainshaft. ### Claim 42 (depends on 40) The hybrid motor vehicle of claim 40 wherein a hybrid two-wheel high-range drive mode is established when said input clutch is applied, said direct clutch is applied, said low brake is released, said transfer clutch is released and drive torque generated by said electric motor is combined with drive torque from the engine to drive said mainshaft. ### Claim 43 (depends on 40) The hybrid motor vehicle of claim 40 wherein an engine two-wheel high-range drive mode is established when said input clutch is applied, said direct clutch is applied, said low brake is released, said transfer clutch is released and said electric motor is off such that drive torque generated by the engine drives said mains haft. ### Claim 44 (depends on 40) The hybrid motor vehicle of claim 40 wherein an electric two-wheel low-range drive mode is established when said input clutch is released, said direct clutch is released, said low brake is applied, said transfer clutch is released and said electric motor is activated to drive said mainshaft. ### Claim 45 (depends on 40) The hybrid motor vehicle of claim 40 wherein a hybrid two-wheel low-range drive mode is established when said input clutch is applied, said direct clutch is released, said low brake is applied, said transfer clutch is released and drive torque generated by said electric motor is combined with drive torque from the engine to drive said mainshaft. ### Claim 46 (depends on 40) The hybrid motor vehicle of claim 40 wherein an engine two-wheel low-range drive mode is established when said input clutch is applied, said direct clutch is released, said low brake is applied, said transfer clutch is released and said electric motor is off such that drive torque generated by the engine drives said mainshaft. ### Claim 47 (depends on 40) The hybrid motor vehicle of claim 40 wherein an electric four-wheel high-range drive mode is established when said input clutch is released, said direct clutch is applied, said low brake is released, said transfer clutch is applied and said electric motor is activated to drive said mainshaft. ### Claim 48 (depends on 47) The hybrid motor vehicle of claim 47 wherein said transfer clutch can be fully engaged to define a locked four-wheel high-range drive mode or actuation of said transfer clutch can be varied to define an on-demand four-wheel high-range drive mode. ### Claim 49 (depends on 40) The hybrid motor vehicle of claim 40 wherein a hybrid four-wheel high-range drive mode is established when said input clutch is applied, said direct clutch is applied, said low brake is released, said transfer clutch is applied and drive torque generated by said electric motor is combined with drive torque from the engine to drive said mainshaft. ### Claim 50 (depends on 49) The hybrid motor vehicle of claim 49 wherein said transfer clutch can be fully engaged to define a locked four-wheel high-range drive mode or actuation of said transfer clutch can be varied to define an on-demand four-wheel high-range drive mode. ### Claim 51 (depends on 40) The hybrid motor vehicle of claim 40 wherein an engine four-wheel high-range drive mode is established when said input clutch is applied, said direct clutch is applied, said low brake is released, said transfer clutch is applied and said electric motor is off such that drive torque generated by the engine drives said mainshaft. ### Claim 52 (depends on 51) The hybrid motor vehicle of claim 51 wherein said transfer clutch can be fully engaged to define a locked four-wheel high-range drive mode or actuation of said transfer clutch can be varied to define an on-demand four-wheel high-range drive mode. ### Claim 53 A hybrid motor vehicle, comprising: a powertrain; a first driveline including a first axle driving a pair of first wheels; a second driveline including a second axle driving a pair of second wheels; a transfer case including an input shaft driven by said powerirain, a mainshaft driving a reduction unit having an output member, a first clutch for selectively coupling said input shaft to said mainshaft, a first output shaft driven by said output member and operably connected to said first driveline, a second output shaft driven by said output member and operably connected to said second driveline, a second clutch operable in a first mode to establish a high-range drive connection between said mainshaft and said output member and in a second mode to establish a low-range drive connection therebetween, and an electric motor for selectively driving said mainshaft; and a control system for controlling coordinated actuation of said first and second clutches and said electric motor. ### Claim 54 (depends on 53) The hybrid motor vehicle claim 53 of wherein a hybrid four-wheel high-range drive mode is established when said first clutch couples said input shaft to said mainshaft, said second clutch is operating in its first mode, and said electric motor is activated such that said mainshaft is driven by said electric motor and said powertrain. ### Claim 55 (depends on 53) The hybrid motor vehicle of claim 53 wherein an electric four-wheel high-range drive mode is established when said first clutch uncouples said mainshaft from said input shaft, said second clutch is operating in its first mode, and said electric motor is activated to drive said mainshaft. ### Claim 56 (depends on 53) The hybrid motor vehicle of claim 53 wherein an engine four-wheel high-range drive mode is established when said first clutch couples said input shaft to said mainshaft, said second clutch is operating in its first mode, and said electric motor is off such that said powertrain drives said mainshaft. ### Claim 57 (depends on 53) The hybrid motor vehicle of claim 53 wherein a hybrid four-wheel low-range drive mode is established when said first clutch couples said input shaft to said mainshaft, said second clutch is operating in its first mode, and said electric motor is activated such that said mainshaft is driven by said electric motor and said powertrain. ### Claim 58 (depends on 53) The hybrid motor vehicle of claim 53 wherein an electric four-wheel low-range drive mode is established when said first clutch uncouples said mainshaft from said input shaft, said second clutch is operating in its first mode, and said electric motor is activated to drive said mainshaft. ### Claim 59 (depends on 53) The hybrid motor vehicle of claim 53 wherein an engine four-wheel high-range drive mode is established when said first clutch couples said input shaft to said mainshaft, said second clutch is operating in its first mode, and said electric motor is off such that said powertrain drives said mainshaft. ### Claim 60 (depends on 53) The hybrid motor vehicle of claim 53 wherein said reduction unit further includes a reaction member driven by said output member, and wherein said second clutch includes a direct clutch that is operable for selectively coupling said output member for rotation with said mainshaft and a low brake assembly that is operable for selectively braking rotation of said reduction member, whereby said first mode of said second clutch is established when said direct clutch assembly is engaged and said low brake assembly is released, and said second mode of said second clutch is established when said direct clutch assembly is released and said low brake assembly is engaged. ### Claim 61 (depends on 60) The hybrid motor vehicle of claim 60 when said reduction unit is a planetary gearset with a sun gear driven by said mainshaft, a ring gear as its reaction member, and planet gears meshed with said sun gear and ring gear that are supported from a carrier as its output member. ### Claim 62 (depends on 53) The hybrid motor vehicle of claim 53 further comprising a third clutch for selectively coupling said output member of said reduction unit to said front output shaft, said third clutch is operable in a first mode to establish a two-wheel drive mode wherein all drive torque is transferred to the rear driveline through said rear output shaft, said third clutch is operable in a second mode to establish a four-wheel drive mode wherein at least a portion of the drive torque is transferred to the front driveline through said front output shaft.