WO2022208529A1 - Hybrid powertrain - Google Patents

Hybrid powertrain Download PDF

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Publication number
WO2022208529A1
WO2022208529A1 PCT/IN2022/050259 IN2022050259W WO2022208529A1 WO 2022208529 A1 WO2022208529 A1 WO 2022208529A1 IN 2022050259 W IN2022050259 W IN 2022050259W WO 2022208529 A1 WO2022208529 A1 WO 2022208529A1
Authority
WO
WIPO (PCT)
Prior art keywords
vehicle
assembly
hybrid
engine
motor
Prior art date
Application number
PCT/IN2022/050259
Other languages
French (fr)
Inventor
Kulkarni Kiran
Kumar Davinder
Original Assignee
Tvs Motor Company Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tvs Motor Company Limited filed Critical Tvs Motor Company Limited
Publication of WO2022208529A1 publication Critical patent/WO2022208529A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; 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
    • 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
    • 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
    • B60K6/387—Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; 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
    • B60K6/40—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; 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 assembly or relative disposition of components
    • 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
    • B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
    • 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
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • 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
    • B60W20/40—Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers
    • 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
    • B60K6/48—Parallel type
    • B60K2006/4808—Electric machine connected or connectable to gearbox output shaft
    • 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
    • B60W2300/00—Indexing codes relating to the type of vehicle
    • B60W2300/36—Cycles; Motorcycles; Scooters
    • 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
    • B60W2300/00—Indexing codes relating to the type of vehicle
    • B60W2300/36—Cycles; Motorcycles; Scooters
    • B60W2300/365—Scooters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/10—Road Vehicles
    • B60Y2200/12—Motorcycles, Trikes; Quads; Scooters

Definitions

  • the present subject matter relates to a straddle type vehicle. More particularly, the present subject matter relates a hybrid powertrain of straddle type vehicle. BACKGROUND
  • Fig.l is a side view of a straddle hybrid type vehicle as per one embodiment of the present invention.
  • Fig.2 is an assembled view of a hybrid powertrain unit view as per one embodiment of the present invention.
  • Fig.2a is a sectional view of the hybrid powertrain unit as per one embodiment of the present invention.
  • Fig. 2b is a shoe of centrifugal clutch engaged with a clutch drum as per one embodiment of the present invention.
  • Fig. 3 is an assembled view of a hybrid powertrain unit view as per another embodiment of the present invention.
  • FIG. 3a sectional view of the hybrid powertrain unit as per another embodiment of the present invention.
  • the hybrid vehicles have a primary electric drive with associated energy storage unit and an internal combustion engine coupled to an electric motor/generator.
  • series hybrid the wheels are driven solely by the electric motor, which is powered by either the energy storage unit or the IC engine-generator.
  • the energy storage unit is charged by the generator and by regenerative braking.
  • a series hybrid is essentially an electric vehicle with an on-board engine-generator for charging of an energy storage unit.
  • Parallel hybrids are in effect a conventional IC automobile with electric assist.
  • the electric system amplifies the power of the IC engine during acceleration and recovers energy in braking. In this sense the electric system acts like a supercharger to give a small IC engine the performance of a large one.
  • a “strong” parallel hybrid is one in which the electric system can provide enough torque and power that the vehicle can be operated on electric power alone.
  • EV electric vehicles
  • HEV hybrid electric vehicle
  • the above- mentioned types of automobiles are equipped with an electrical component like energy storage unit, for supplying electric power as electric energy to an electric motor.
  • the vehicle's driving force is provided from an energy storage unit in order to receive the energy required for driving the vehicle.
  • hybrid vehicles configured to be powered either by an internal combustion engine or electric motor or both, are replacing normal engine powered vehicles. For example, driving on terrain or for long distances, an internal combustion engine can be used and for shorter distances electric propulsion system can be used.
  • Conventional straddle type vehicle having power unit as an internal combustion engine includes a frame assembly having a front zone and a rear zone.
  • the front zone supports a steering assembly along with a front telescopic suspension of the vehicle.
  • the front zone includes a main frame, a down frame which supports the vehicle parts including power unit.
  • the rear zone includes a sub-frame that includes rear wheel, a kick starter system and a rear suspension assembly connected thereof. Therefore, the rear zone and front zone are subjected to various forces from the front and rear wheel through the suspension and from the power unit in addition to the payloads arising out the occupants & goods.
  • the straddle type vehicle Since, the straddle type vehicle has space constraints; therefore, incorporation of internal combustion engine, electric motor assembly and other related systems like transmission system in the conventional layout of the straddle type vehicle makes the vehicle bulky and system more complex. Hence, it is apparent that there exists a challenge of achieving a compact layout of the straddle type vehicle, where the components like the internal combustion engines, electric motor assembly and other related systems like transmission system need to be disposed in close proximity in a secure, safe manner while still being able to maintain the conventional length or shorter wheelbase and width of the straddle type vehicle to transform the conventional straddle type vehicle into the hybrid straddle type vehicle.
  • a hybrid straddle type vehicle typically includes an engine; a motor is configured on a vehicle center line. The motor is disposed offset to a clutch chamber (clutch mechanism). This leads to increased number of components for mounting the components in the vehicle. Further, an energy storage unit and an inverter are provided below a seat in the vehicle. This configuration has its own disadvantages that there is a need to increase height of a seat of the vehicle to accommodate the energy storage unit and the inverter thereof, thereby, increasing overall height of the vehicle.
  • a hybrid vehicle typically includes an electric motor assembly disposed on a rear wheel of the vehicle as an independent component.
  • An engine assembly is disposed away from the electric motor assembly in the vehicle.
  • This configuration has its own disadvantage as additional numbers of components are required to mount the electric motor assembly on the rear wheel and also, such configuration makes the vehicle bulky.
  • the present invention provides a solution to the above problems while meeting the requirements of minimum modifications in a conventional straddle vehicle, at low cost with ease of assembly of the components.
  • the present invention discloses a straddle type vehicle and more particularly an improved layout configuration of components while ensuring the conventional length, small wheelbase and compact width of the vehicle.
  • a frame assembly of a straddle type vehicle comprises of a main frame, down frame etc., wherein a horizontal portion of the main frame is provided with an engine mounting bracket to mount an engine assembly thereby ensuring rigid mounting of the engine below a horizontally extending downward portion of the main frame.
  • a fuel tank is disposed at a slightly tilted position on the main frame and an air cleaner assembly is disposed on the main frame and superimposed by the fuel tank.
  • the engine assembly includes a cylinder head, a crankcase, and an integrated starter generator.
  • the cylinder head is disposed in front of the crankcase.
  • the cam clutch, the centrifugal clutch of a transmission system and the integrated starter generator are disposed on a crankshaft of the engine assembly.
  • a primary drive gear is rigidly coupled or attached with a clutch drum in the vehicle.
  • the primary drive gear and the clutch drum are freely rotatable on the crankshaft of the engine assembly.
  • the vehicle includes an electric motor assembly.
  • the electric motor assembly includes a motor drive gear and a motor driven gear.
  • the motor driven gear is mounted rigidly on the drive shaft.
  • the motor drive gear meshes with the motor driven gear.
  • the motor drive gear, the motor driven gear and the drive shaft are configured with various means like one way bearing, thus eliminating power transmission to the electric motor when the engine is in activated/running state.
  • the integrated starter generator starts/activates the engine assembly of the vehicle, which eliminates the need of kick starter system for starting the vehicle. This rotates the crankshaft at a predetermined speed.
  • the centrifugal clutch includes shoe which is engages with a clutch drum, where a primary drive gear is rigidly coupled or attached with the clutch drum. Therefore, the power as generated from the crankshaft is transferred to a primary driven gear through the primary drive gear.
  • the primary driven gear is rigidly attached to a drive shaft and the drive shaft is connected to a rear wheel with a chain drive of the vehicle. As a result, power is transmitted from the primary driven gear to the drive shaft for transmitting power to the rear wheel of the vehicle, thus, enabling movement of the vehicle in pure engine mode.
  • the electric motor assembly transmits power to the drive shaft through the motor drive gear and the motor driven gear.
  • the drive shaft transmits the power to the wheel through chain drive system in the vehicle.
  • the centrifugal clutch is not in engaged state in pure EV mode as the shoes are not engaged with the rotating clutch drum, thereby isolating the engine assembly completely.
  • the centrifugal clutch when the vehicle shifts from pure electric vehicle mode to pure engine mode, the centrifugal clutch is operated by a clutch actuation motor.
  • the clutch actuation motor When the clutch actuation motor is activated, the cam clutch actuates the shoe of the centrifugal clutch to engage with the clutch drum and thus transmits the power to the rear wheel of the vehicle.
  • an integrated starter generator is coupled to a drive shaft in the engine assembly. The integrated starter generator generates power to start the vehicle and also charges energy storage unit when the switch over from electric mode to engine mode happens in the vehicle.
  • front and rear refers to front and rear, and left and right directions as seen in a state of being seated on a seat of the vehicle and looking forward.
  • a longitudinal axis refers to a front to rear axis relative to the vehicle, while a lateral axis refers generally to a side to side, or left to right axis relative to the vehicle.
  • the vehicle is a straddle type hybrid vehicle.
  • the concepts of the present invention may be applied to any of the two wheelers to achieve a compact layout.
  • FIG. 1 is a left side view of an exemplary step through straddle type vehicle, as per one embodiment of present subject matter.
  • the vehicle (100) has a mono-tube type frame structure, which acts as a skeleton for bearing the loads and is also referred to as backbone frame.
  • Instrument cluster (119) is mounted on a handle bar (126).
  • the handle bar (126) is pivotally disposed through a head tube where it includes brake levers (113).
  • the handle bar (126) is connected to a front wheel (129) by one or more front suspension(s) (130).
  • a front fender (131) is disposed above the front wheel (129) for covering at least a portion of the front wheel (129).
  • a leg shield (112) is provided on the vehicle (100).
  • a fuel tank (103) having fuel cap (114) is mounted to a main frame of the mono-tube type frame structure and it is disposed in front portion F of a step-through space of the mono-tube type frame structure.
  • a swing arm (134) is swingably connected to the mono-tube type frame structure.
  • a rear wheel (133) is rotatably supported by the swing arm (134).
  • One or more rear suspension(s) (130) is connected the swing arm (134) at an angle, to sustain both the radial and axial forces occurring due to wheel reaction, to the mono-tube type frame structure.
  • a license plate (105) and reflector (116) are mounted on a rear fender (128) which is disposed above the rear wheel (133), where the license plate and a license plate lamp (not shown) is mounted by a single piece license plate bracket (not labelled).
  • a seat assembly (132a, 132b) is disposed at a rear portion (R) of the step- through space.
  • the seat assembly (132) includes a rider seat (132a), and a pillion seat (132b).
  • the vehicle (100) is provided with the grab rail (109). Further, the seat assembly (132a, 132b) is positioned above the rear wheel (133). The vehicle is supported by a center stand (120) mounted to the mono-tube type frame structure.
  • a tool box (110) is provided on the left side of the vehicle (100).
  • a cover member (118) is mounted in the step through region of a down tube. The body side cover member (118) covers at least a portion of an engine (125) & step through region of the down tube.
  • the engine assembly (122) comprises a cylinder head (123), a cylinder (124), and a crankcase in order from the front to the rear direction of the engine assembly (122).
  • the cylinder (124) protrudes in a forward direction from the front end portion of the crankcase.
  • the engine assembly (122), a transmission assembly (121) and an electric motor assembly (207) (as shown in fig. 2) and an integrated starter generator (212) (as shown in fig. 4) are configured to form a hybrid powertrain unit (135) of the vehicle.
  • Fig. 2 is an assembled view of a portion of the hybrid powertrain unit of the vehicle as per one embodiment of the present invention.
  • the hybrid powertrain unit includes a crankshaft (201), a primary drive gear (211), a clutch drum (210), and a motor (202) for actuating a cam clutch (203), a centrifugal clutch (204), a drive shaft (205), an electric motor assembly (207) and a primary driven gear (206).
  • the electric motor assembly (207) includes a motor drive gear (208) and motor driven gear (209).
  • the cam clutch (203), the centrifugal clutch (204) and an integrated starter generator (212) (as shown in fig.
  • a primary drive gear (211) is rigidly coupled or attached with a clutch drum (210) in the vehicle.
  • the primary drive gear (211) and the clutch drum (210) are freely rotatable on the crankshaft of the engine assembly.
  • the centrifugal clutch (204) includes shoe (213) (as shown in fig. 2b), which engages with the clutch drum (210) which in turn is rigidly coupled with primary drive gear (211).
  • the primary drive gear (211) is coupled with the primary driven gear (206), where the primary driven gear (206) is rigidly attached to the drive shaft (205) in the vehicle.
  • the electric motor assembly (207) is disposed laterally at least partially offset with respect to a cylinder axis (CC’) and within lateral boundary limits XI and X2 of the engine assembly (122), ensuring compact packaging of the components and also maintaining centre of gravity (CG) of the vehicle.
  • the integrated starter generator (212) starts/activates the engine assembly (122) of the vehicle, eliminating need of kick starter system for starting the vehicle. This rotates the crankshaft (201) at a predetermined speed.
  • the centrifugal clutch (204) includes shoe (213) which engages with the clutch drum (210), where the primary drive gear (211) is rigidly coupled or attached with the clutch drum (210).
  • the power as generated from the crankshaft (201) is transferred to a primary driven gear (206) through the primary drive gear (211).
  • the primary driven gear (206) is rigidly attached to the drive shaft (205) and the drive shaft (205) is connected to the rear wheel (133) with a chain drive of the vehicle.
  • the power is transmitted from the primary driven gear to the drive shaft for transmitting power to the rear wheel of the vehicle, thus, enabling movement of the vehicle in pure engine mode.
  • the electric motor assembly (207) transmits power to the drive shaft (205) through the motor drive gear (208) and the motor driven gear (209), where the motor drive gear (208) and the motor driven gear (209) are coupled with each other.
  • the drive shaft (205) transmits the power to the wheel (133) through chain drive system in the vehicle.
  • the drive shaft (205), the primary driven gear (206), the primary drive gear (211) and the clutch drum (210) are coupled with each other, leading to free rotation of the primary drive gear (211) and the clutch drum (210).
  • the centrifugal clutch (204) is not in engaged state as the shoe (213) is not engaged with the rotating clutch drum (210), thereby isolating the engine assembly completely.
  • the motor drive gear (208) and the motor driven gear (209) are coupled with one way bearing to eliminate the transmission of power to the electric motor assembly in a pure engine mode of operation.
  • the powertrain unit (135) when the vehicle is in parallel hybrid mode, the powertrain unit (135) includes the engine assembly (122) and the electric motor assembly (207).
  • the engine assembly (122) and the electric motor assembly (207) are connected in parallel to provide power to the rear wheel of the vehicle.
  • the powers from the electric motor assembly and engine assembly are pooled together and thus transmitted to the rear wheel of the vehicle.
  • the integrated starter generator (212) charges an energy storage unit (not shown).
  • the power in the series hybrid mode is transferred to the rear wheel through the electric motor assembly (207) which in turn draws energy from the energy storage unit.
  • the cam clutch (203) when the vehicle shifts from pure electric vehicle mode to hybrid mode as per the requirement of rider, the cam clutch (203) is operated or actuated by the clutch actuation motor (202) manually, for example, through a switch (not shown) by the rider in the vehicle.
  • the clutch actuation motor (202) is a small size compact motor as compared to the electric motor assembly 207.
  • the cam clutch (203) When the clutch actuation motor (202) is activated by the switch, the cam clutch (203) actuates the shoe (213) shown in Fig 2b of the centrifugal clutch (204) to engage with the clutch drum (210), which in turn is rigidly coupled with primary drive gear (211).
  • this configuration transfer’s optimum torque to the crankshaft, which results into rotation of the crankshaft, thus, activates the engine assembly (122) of the vehicle.
  • the power as generated from the crankshaft (201) is transferred to a primary driven gear (206) through the primary drive gear (211) which is coupled with the clutch drum (210).
  • the primary driven gear (206) is rigidly attached to the drive shaft (205) and the drive shaft (205) is connected to the rear wheel (133) with a chain drive of the vehicle.
  • the power is transmitted from the primary driven gear to the drive shaft for transmitting power to the rear wheel of the vehicle, thus, enabling movement of the vehicle in hybrid mode.
  • the configuration facilitates working of the vehicle in different modes separately and in a switchover of modes also.
  • Fig. 3 is a perspective view of the power train unit as per another embodiment of the present invention.
  • the power train unit (135) includes an integrated starter generator (212), a primary driven gear (206), a drive shaft (205), a centrifugal clutch (204), and a cam clutch (203), a motor for actuating the cam clutch (202), a clutch drum (210) and a crankshaft (201).
  • the integrated starter generator (212) is disposed laterally offset with respect to cylinder axis (CC’) and inside the crankcase of the engine assembly.
  • the integrated starter generator (212) is coupled to the drive shaft (205) and the primary driven gear (206) is rigidly attached with the integrated starter generator (212).
  • the integrated starter generator (212) functioning as a drive motor, activates the vehicle in complete EV mode.
  • the drive shaft (205), the primary driven gear (206), the primary drive gear (211) and the clutch drum (210) are coupled with each other and the primary drive gear (211) and the clutch drum (210) are freely rotating in EV mode.
  • the vehicle in EV mode reaches a speed up to predetermined limit, for example, 20kmph.
  • predetermined limit for example, 20kmph.
  • the mode of the vehicle changes by user as per the requirement or through a controller, where controller detects the speed of the vehicle to determine the required mode of the vehicle that is from complete EV mode to hybrid mode.
  • the motor (202) actuates the cam clutch (203), which is responsible for engaging shoe of the centrifugal clutch (204) with the clutch drum (210), which in turn is rigidly coupled with primary drive gear (211).
  • this configuration transfer’s optimum torque to the crankshaft (201), which results into rotation of the crankshaft (201), thus, activates the engine assembly (122) of the vehicle.
  • the crankshaft (201) transfers power to the drive shaft (205) through primary drive gear 211 and primary driven gear (206).
  • This configuration helps in cranking the engine assembly to start via the ISG (212).
  • This configuration maintains fuel economy in the vehicle, less emission from the vehicle etc.
  • This configuration also reduces weight of the vehicle overall.
  • the engine assembly decouples at that moment and regeneration happens from the integrated starter generator where it charges the energy storage unit without any frictional energy loss.
  • the invention helps in overcoming the problem of space constraint in the vehicle while maintaining conventional layout of the vehicle that is length and width of the vehicle and ultimately makes it cost effective. Additionally, the layout configuration as per present invention enables compact dimensions, packaging, distribution, enhanced riding performance and faster system response time.
  • the embodiments of the present invention describes the potential modifications in the securely mounting of the components in the hybrid vehicle.

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  • Chemical & Material Sciences (AREA)
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Abstract

The present invention discloses a hybrid power unit (135) for a two wheeled vehicle, where hybrid power unit (135) includes an engine assembly (122), an electric motor assembly (207), and a transmission assembly (121). The electric motor assembly being disposed laterally, at least partially offset, with respect to a cylinder axis of the engine assembly and within lateral boundary limits of said engine assembly. In another embodiment an integrated starter generator being disposed inside a crankcase of the engine assembly. Both the embodiments ensures compact configuration of the hybrid power unit in the vehicle.

Description

HYBRID POWERTRAIN
TECHNICAL FIELD
[0001] The present subject matter relates to a straddle type vehicle. More particularly, the present subject matter relates a hybrid powertrain of straddle type vehicle. BACKGROUND
[0002] Conventionally, most of vehicles are propelled by an internal combustion engine which uses fossil fuels as a source of energy. The gases formed by combustion of the fossil fuels within the internal combustion engine are exhausted from such vehicles to the atmosphere, which leads to increased air pollution in the atmosphere. [0003] Presently, in view of the same, electric vehicles are used as a substitute for the vehicles using fossil fuels. However, such vehicles are required to be equipped with energy storage units having a large capacity in order to propel the vehicles through large distances. So, the vehicles typically include one or more battery, a motor and drive train supported on a frame and enclosed in a body, which propels the vehicle through large distances. Further, electric vehicles (EVs) are currently experiencing increasing demand due to the growing price of fossil fuels and undesirable emissions from traditional internal combustion engine vehicles. Alternatively hybrid powertrain vehicles are also being developed to leverage the best of the powertrain in a combination to maximise output performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0004] The detailed description is described with reference to an embodiment of a two wheeled vehicle along with the accompanying figures. The same numbers are used throughout the drawings to reference like features and components.
[0005] Fig.l is a side view of a straddle hybrid type vehicle as per one embodiment of the present invention.
[0006] Fig.2 is an assembled view of a hybrid powertrain unit view as per one embodiment of the present invention.
[0007] Fig.2a is a sectional view of the hybrid powertrain unit as per one embodiment of the present invention. [0008] Fig. 2b is a shoe of centrifugal clutch engaged with a clutch drum as per one embodiment of the present invention.
[0009] Fig. 3 is an assembled view of a hybrid powertrain unit view as per another embodiment of the present invention.
[00010] Fig. 3a. sectional view of the hybrid powertrain unit as per another embodiment of the present invention.
DETAILED DESCRIPTION
[00011] The arena of technology pertaining to transportation has undergone a tremendous transformation over the years, such that the present concentration is focused upon the efficiency and cost of manufacturing, which includes the cost of materials, assembly cost, cost of inventory handling etc. Simultaneously, there has also been need in the industry to provide stronger, lighter and economically advantageous vehicles that consume less power. Electric power storage device driven vehicles happen to be eco- friendly, in line with the Go Green initiative of various organizations. These vehicles may be two, three or four wheelers depending upon the requirement of the consumer and have multiple applications.
[00012] In automobile vehicle industry, electric vehicles are introduced to control air pollution caused due to IC engine powered vehicles. Currently, the electric vehicles are classified into two groups, namely pure electric and extended electric vehicles (also known as hybrid vehicles). The hybrid vehicles have a primary electric drive with associated energy storage unit and an internal combustion engine coupled to an electric motor/generator.
[00013] Further, there are two types of electric hybrid vehicle concepts, i.e., series and parallel. In series hybrid, the wheels are driven solely by the electric motor, which is powered by either the energy storage unit or the IC engine-generator. The energy storage unit is charged by the generator and by regenerative braking. A series hybrid is essentially an electric vehicle with an on-board engine-generator for charging of an energy storage unit.
[00014] In the more sophisticated parallel hybrid, the wheels are driven by both the electric motor and the IC engine. Parallel hybrids are in effect a conventional IC automobile with electric assist. The electric system amplifies the power of the IC engine during acceleration and recovers energy in braking. In this sense the electric system acts like a supercharger to give a small IC engine the performance of a large one. A “strong” parallel hybrid is one in which the electric system can provide enough torque and power that the vehicle can be operated on electric power alone.
[00015] In recent years, electric vehicles (EV) have become quite popular due to high oil prices and the environmental impact of pure gasoline fuel consumption vehicles. Pure electric vehicles use electric motors as a driving source and hybrid electric vehicle (HEV) combine other driving sources such as an electric motor and an engine. The above- mentioned types of automobiles are equipped with an electrical component like energy storage unit, for supplying electric power as electric energy to an electric motor. In this particular type of vehicles, the vehicle's driving force is provided from an energy storage unit in order to receive the energy required for driving the vehicle. Generally, hybrid vehicles, configured to be powered either by an internal combustion engine or electric motor or both, are replacing normal engine powered vehicles. For example, driving on terrain or for long distances, an internal combustion engine can be used and for shorter distances electric propulsion system can be used. So, there is a constant need of EV/HEV type vehicle, to decrease the pollution level in the atmosphere, but there exists a challenge to configure the additional components in the vehicle having conventional compact layout. Unlike in a vehicle with four or more wheels or multi-track vehicles, the size of the vehicle is large enough to package the required sub-system of an EV / HEV platform and power unit. Also, such large vehicles have a low impact on the power to weight ratio in laden and unladen condition i.e. when carrying occupants. The challenge for a saddle type vehicle is rather opposite and complex. While the change in power to weight ratio is significant with laden condition, there is an additional contradictory requirement of designing a compact vehicle with EV / HEV powertrain unit.
[00016] Conventional straddle type vehicle having power unit as an internal combustion engine includes a frame assembly having a front zone and a rear zone. The front zone supports a steering assembly along with a front telescopic suspension of the vehicle. The front zone includes a main frame, a down frame which supports the vehicle parts including power unit. The rear zone includes a sub-frame that includes rear wheel, a kick starter system and a rear suspension assembly connected thereof. Therefore, the rear zone and front zone are subjected to various forces from the front and rear wheel through the suspension and from the power unit in addition to the payloads arising out the occupants & goods. Since, the straddle type vehicle has space constraints; therefore, incorporation of internal combustion engine, electric motor assembly and other related systems like transmission system in the conventional layout of the straddle type vehicle makes the vehicle bulky and system more complex. Hence, it is apparent that there exists a challenge of achieving a compact layout of the straddle type vehicle, where the components like the internal combustion engines, electric motor assembly and other related systems like transmission system need to be disposed in close proximity in a secure, safe manner while still being able to maintain the conventional length or shorter wheelbase and width of the straddle type vehicle to transform the conventional straddle type vehicle into the hybrid straddle type vehicle.
[00017] Typically, as per known art, a hybrid straddle type vehicle includes an engine; a motor is configured on a vehicle center line. The motor is disposed offset to a clutch chamber (clutch mechanism). This leads to increased number of components for mounting the components in the vehicle. Further, an energy storage unit and an inverter are provided below a seat in the vehicle. This configuration has its own disadvantages that there is a need to increase height of a seat of the vehicle to accommodate the energy storage unit and the inverter thereof, thereby, increasing overall height of the vehicle.
[00018] Typically, as per another known art, a hybrid vehicle includes an electric motor assembly disposed on a rear wheel of the vehicle as an independent component. An engine assembly is disposed away from the electric motor assembly in the vehicle. This configuration has its own disadvantage as additional numbers of components are required to mount the electric motor assembly on the rear wheel and also, such configuration makes the vehicle bulky.
[00019] Hence, there exists a contradictory challenge of securely mounting components like internal combustion engine, electric motor assembly, etc. in a compact hybrid straddle type vehicle, while ensuring safety and ease of assembly to the user having hybrid straddle type vehicles without any major change in conventional layout design and manufacturing set-up of the vehicle. [00020] Therefore, there is a need to have an improved layout of the vehicle, for housing components like, an engine assembly, an electric motor etc. which ensures secure and compact packaging of these components in the vehicle while maintaining the conventional length or wheelbase and compact width of the vehicle.
[00021] The present invention provides a solution to the above problems while meeting the requirements of minimum modifications in a conventional straddle vehicle, at low cost with ease of assembly of the components.
[00022] With the above objectives in view, the present invention discloses a straddle type vehicle and more particularly an improved layout configuration of components while ensuring the conventional length, small wheelbase and compact width of the vehicle.
[00023] As per one aspect of the present invention, a frame assembly of a straddle type vehicle comprises of a main frame, down frame etc., wherein a horizontal portion of the main frame is provided with an engine mounting bracket to mount an engine assembly thereby ensuring rigid mounting of the engine below a horizontally extending downward portion of the main frame. A fuel tank is disposed at a slightly tilted position on the main frame and an air cleaner assembly is disposed on the main frame and superimposed by the fuel tank.
[00024] As per one aspect of the present invention, the engine assembly includes a cylinder head, a crankcase, and an integrated starter generator. The cylinder head is disposed in front of the crankcase. The cam clutch, the centrifugal clutch of a transmission system and the integrated starter generator are disposed on a crankshaft of the engine assembly. As per one aspect of the present invention, a primary drive gear is rigidly coupled or attached with a clutch drum in the vehicle. The primary drive gear and the clutch drum are freely rotatable on the crankshaft of the engine assembly.
[00025] As per one aspect of the present invention, the vehicle includes an electric motor assembly. The electric motor assembly includes a motor drive gear and a motor driven gear. The motor driven gear is mounted rigidly on the drive shaft. The motor drive gear meshes with the motor driven gear. The motor drive gear, the motor driven gear and the drive shaft are configured with various means like one way bearing, thus eliminating power transmission to the electric motor when the engine is in activated/running state. [00026] As per one aspect of the present invention, when the vehicle is in pure engine mode, the integrated starter generator starts/activates the engine assembly of the vehicle, which eliminates the need of kick starter system for starting the vehicle. This rotates the crankshaft at a predetermined speed. The centrifugal clutch includes shoe which is engages with a clutch drum, where a primary drive gear is rigidly coupled or attached with the clutch drum. Therefore, the power as generated from the crankshaft is transferred to a primary driven gear through the primary drive gear. The primary driven gear is rigidly attached to a drive shaft and the drive shaft is connected to a rear wheel with a chain drive of the vehicle. As a result, power is transmitted from the primary driven gear to the drive shaft for transmitting power to the rear wheel of the vehicle, thus, enabling movement of the vehicle in pure engine mode.
[00027] In pure electric vehicle mode, the electric motor assembly transmits power to the drive shaft through the motor drive gear and the motor driven gear. The drive shaft transmits the power to the wheel through chain drive system in the vehicle. Further, as per one aspect of the present invention, the centrifugal clutch is not in engaged state in pure EV mode as the shoes are not engaged with the rotating clutch drum, thereby isolating the engine assembly completely.
[00028] In parallel hybrid mode, the engine assembly and the electric motor assembly are connected in parallel to provide power to the rear wheel of the vehicle. The powers from the electric motor assembly and engine assembly are pooled together and thus transmitted to the rear wheel of the vehicle.
[00029] In series hybrid mode, the engine assembly and the electric motor assembly are not connected with each other. As per one aspect of the present invention, the integrated starter generator charges an energy storage unit. The power in the series hybrid mode is transferred to the rear wheel through the electric motor assembly.
[00030] As per one aspect of the present invention, when the vehicle shifts from pure electric vehicle mode to pure engine mode, the centrifugal clutch is operated by a clutch actuation motor. When the clutch actuation motor is activated, the cam clutch actuates the shoe of the centrifugal clutch to engage with the clutch drum and thus transmits the power to the rear wheel of the vehicle. [00031] As per another aspect of the present invention, an integrated starter generator is coupled to a drive shaft in the engine assembly. The integrated starter generator generates power to start the vehicle and also charges energy storage unit when the switch over from electric mode to engine mode happens in the vehicle.
[00032] Further "front" and "rear", and "left" and "right" referred to in the ensuing description of the illustrated embodiment refer to front and rear, and left and right directions as seen in a state of being seated on a seat of the vehicle and looking forward. Furthermore, a longitudinal axis refers to a front to rear axis relative to the vehicle, while a lateral axis refers generally to a side to side, or left to right axis relative to the vehicle.
[00033] The present invention is now described briefly in connection with the rendered drawings. It should be noted that like elements are denoted by the same reference numerals throughout the description.
[00034] In the ensuing exemplary aspects, the vehicle is a straddle type hybrid vehicle. However, it is contemplated that the concepts of the present invention may be applied to any of the two wheelers to achieve a compact layout.
[00035] Fig. 1 is a left side view of an exemplary step through straddle type vehicle, as per one embodiment of present subject matter. The vehicle (100) has a mono-tube type frame structure, which acts as a skeleton for bearing the loads and is also referred to as backbone frame. Instrument cluster (119) is mounted on a handle bar (126). The handle bar (126) is pivotally disposed through a head tube where it includes brake levers (113). The handle bar (126) is connected to a front wheel (129) by one or more front suspension(s) (130). A front fender (131) is disposed above the front wheel (129) for covering at least a portion of the front wheel (129). A leg shield (112) is provided on the vehicle (100). A fuel tank (103) having fuel cap (114) is mounted to a main frame of the mono-tube type frame structure and it is disposed in front portion F of a step-through space of the mono-tube type frame structure. The vehicle (100) having lighting means which includes Head lamp (127), Tail lamp (106), Turning indicators includes front side indicators (111) and rear side indicator (102) respectively and daytime running lamp (104).
[00036] In an embodiment, a swing arm (134) is swingably connected to the mono-tube type frame structure. A rear wheel (133) is rotatably supported by the swing arm (134). One or more rear suspension(s) (130) is connected the swing arm (134) at an angle, to sustain both the radial and axial forces occurring due to wheel reaction, to the mono-tube type frame structure. A license plate (105) and reflector (116) are mounted on a rear fender (128) which is disposed above the rear wheel (133), where the license plate and a license plate lamp (not shown) is mounted by a single piece license plate bracket (not labelled). A seat assembly (132a, 132b) is disposed at a rear portion (R) of the step- through space. In an embodiment, the seat assembly (132) includes a rider seat (132a), and a pillion seat (132b). The vehicle (100) is provided with the grab rail (109). Further, the seat assembly (132a, 132b) is positioned above the rear wheel (133).The vehicle is supported by a center stand (120) mounted to the mono-tube type frame structure. A tool box (110) is provided on the left side of the vehicle (100). A cover member (118) is mounted in the step through region of a down tube. The body side cover member (118) covers at least a portion of an engine (125) & step through region of the down tube.
[00037] The engine assembly (122) comprises a cylinder head (123), a cylinder (124), and a crankcase in order from the front to the rear direction of the engine assembly (122). The cylinder (124) protrudes in a forward direction from the front end portion of the crankcase. As per one embodiment of the present invention, the engine assembly (122), a transmission assembly (121) and an electric motor assembly (207) (as shown in fig. 2) and an integrated starter generator (212) (as shown in fig. 4) are configured to form a hybrid powertrain unit (135) of the vehicle.
[00038] Fig. 2 is an assembled view of a portion of the hybrid powertrain unit of the vehicle as per one embodiment of the present invention. The hybrid powertrain unit includes a crankshaft (201), a primary drive gear (211), a clutch drum (210), and a motor (202) for actuating a cam clutch (203), a centrifugal clutch (204), a drive shaft (205), an electric motor assembly (207) and a primary driven gear (206). As per one embodiment of the present invention, the electric motor assembly (207) includes a motor drive gear (208) and motor driven gear (209). As per one embodiment of the present invention, the cam clutch (203), the centrifugal clutch (204) and an integrated starter generator (212) (as shown in fig. 2a) are disposed on the crankshaft (201) of the engine assembly. As per one embodiment of the present invention, a primary drive gear (211) is rigidly coupled or attached with a clutch drum (210) in the vehicle. The primary drive gear (211) and the clutch drum (210) are freely rotatable on the crankshaft of the engine assembly. Further, as per one embodiment of the present invention, the centrifugal clutch (204) includes shoe (213) (as shown in fig. 2b), which engages with the clutch drum (210) which in turn is rigidly coupled with primary drive gear (211). The primary drive gear (211) is coupled with the primary driven gear (206), where the primary driven gear (206) is rigidly attached to the drive shaft (205) in the vehicle.
[00039] As per one embodiment of the present invention, the electric motor assembly (207) is disposed laterally at least partially offset with respect to a cylinder axis (CC’) and within lateral boundary limits XI and X2 of the engine assembly (122), ensuring compact packaging of the components and also maintaining centre of gravity (CG) of the vehicle. As per one embodiment of the present invention, when the vehicle is in pure engine mode, the integrated starter generator (212) starts/activates the engine assembly (122) of the vehicle, eliminating need of kick starter system for starting the vehicle. This rotates the crankshaft (201) at a predetermined speed. The centrifugal clutch (204) includes shoe (213) which engages with the clutch drum (210), where the primary drive gear (211) is rigidly coupled or attached with the clutch drum (210). Thus, the power as generated from the crankshaft (201) is transferred to a primary driven gear (206) through the primary drive gear (211). The primary driven gear (206) is rigidly attached to the drive shaft (205) and the drive shaft (205) is connected to the rear wheel (133) with a chain drive of the vehicle. The power is transmitted from the primary driven gear to the drive shaft for transmitting power to the rear wheel of the vehicle, thus, enabling movement of the vehicle in pure engine mode.
[00040] Further, as per one embodiment of the present invention, when the vehicle is in pure electric vehicle mode, the electric motor assembly (207) transmits power to the drive shaft (205) through the motor drive gear (208) and the motor driven gear (209), where the motor drive gear (208) and the motor driven gear (209) are coupled with each other. The drive shaft (205) transmits the power to the wheel (133) through chain drive system in the vehicle. Further, as per one embodiment of the present invention, the drive shaft (205), the primary driven gear (206), the primary drive gear (211) and the clutch drum (210) are coupled with each other, leading to free rotation of the primary drive gear (211) and the clutch drum (210). Further, in EV mode, the centrifugal clutch (204) is not in engaged state as the shoe (213) is not engaged with the rotating clutch drum (210), thereby isolating the engine assembly completely. Further, when the vehicle is in complete engine mode, the motor drive gear (208) and the motor driven gear (209) are coupled with one way bearing to eliminate the transmission of power to the electric motor assembly in a pure engine mode of operation.
[00041] As per one embodiment of the present invention, when the vehicle is in parallel hybrid mode, the powertrain unit (135) includes the engine assembly (122) and the electric motor assembly (207). The engine assembly (122) and the electric motor assembly (207) are connected in parallel to provide power to the rear wheel of the vehicle. The powers from the electric motor assembly and engine assembly are pooled together and thus transmitted to the rear wheel of the vehicle.
[00042] As per one embodiment of the present invention, when the vehicle is in pure series hybrid mode, the integrated starter generator (212) charges an energy storage unit (not shown). The power in the series hybrid mode is transferred to the rear wheel through the electric motor assembly (207) which in turn draws energy from the energy storage unit.
[00043] As per one embodiment of the present invention, when the vehicle shifts from pure electric vehicle mode to hybrid mode as per the requirement of rider, the cam clutch (203) is operated or actuated by the clutch actuation motor (202) manually, for example, through a switch (not shown) by the rider in the vehicle. As per an aspect of the present invention, the clutch actuation motor (202) is a small size compact motor as compared to the electric motor assembly 207. When the clutch actuation motor (202) is activated by the switch, the cam clutch (203) actuates the shoe (213) shown in Fig 2b of the centrifugal clutch (204) to engage with the clutch drum (210), which in turn is rigidly coupled with primary drive gear (211). Thereby, this configuration transfer’s optimum torque to the crankshaft, which results into rotation of the crankshaft, thus, activates the engine assembly (122) of the vehicle. The power as generated from the crankshaft (201) is transferred to a primary driven gear (206) through the primary drive gear (211) which is coupled with the clutch drum (210). The primary driven gear (206) is rigidly attached to the drive shaft (205) and the drive shaft (205) is connected to the rear wheel (133) with a chain drive of the vehicle. The power is transmitted from the primary driven gear to the drive shaft for transmitting power to the rear wheel of the vehicle, thus, enabling movement of the vehicle in hybrid mode. Hence, the configuration facilitates working of the vehicle in different modes separately and in a switchover of modes also. Further, the present configuration facilitates compact packaging of the electric motor assembly in the vehicle while maintaining the conventional layout of the vehicle. The drive mechanism including the electric motor assembly, the integrated starter generator the engine assembly and the transmission assembly are configured and disposed together in the vehicle forming a hybrid powertrain unit. The configuration eliminates need of additional component to mount the EV/HEV components in the vehicle while still achieving a compact lateral width by disposing all the components of the hybrid powertrain unit substantially within the lateral boundary limits XI and X2. Further, the flexibility to operate vehicle in different modes, also, results in reduction of emission from the vehicle [00044] Fig. 3 is a perspective view of the power train unit as per another embodiment of the present invention. As per another embodiment of the present invention, the power train unit (135) includes an integrated starter generator (212), a primary driven gear (206), a drive shaft (205), a centrifugal clutch (204), and a cam clutch (203), a motor for actuating the cam clutch (202), a clutch drum (210) and a crankshaft (201). As per another embodiment of the present invention, the integrated starter generator (212) is disposed laterally offset with respect to cylinder axis (CC’) and inside the crankcase of the engine assembly. As per another embodiment of the present invention, the integrated starter generator (212) is coupled to the drive shaft (205) and the primary driven gear (206) is rigidly attached with the integrated starter generator (212). As per another embodiment of the present invention, the integrated starter generator (212), functioning as a drive motor, activates the vehicle in complete EV mode. The drive shaft (205), the primary driven gear (206), the primary drive gear (211) and the clutch drum (210) are coupled with each other and the primary drive gear (211) and the clutch drum (210) are freely rotating in EV mode. The vehicle in EV mode reaches a speed up to predetermined limit, for example, 20kmph. When the vehicle exceeds the predetermined limit of the speed, the mode of the vehicle changes by user as per the requirement or through a controller, where controller detects the speed of the vehicle to determine the required mode of the vehicle that is from complete EV mode to hybrid mode. In hybrid mode, the motor (202) actuates the cam clutch (203), which is responsible for engaging shoe of the centrifugal clutch (204) with the clutch drum (210), which in turn is rigidly coupled with primary drive gear (211). Thereby, this configuration transfer’s optimum torque to the crankshaft (201), which results into rotation of the crankshaft (201), thus, activates the engine assembly (122) of the vehicle. Therefore, the crankshaft (201) transfers power to the drive shaft (205) through primary drive gear 211 and primary driven gear (206). This configuration helps in cranking the engine assembly to start via the ISG (212). This configuration maintains fuel economy in the vehicle, less emission from the vehicle etc. This configuration also reduces weight of the vehicle overall. When the vehicle decelerates and the rider applies break, the engine assembly decouples at that moment and regeneration happens from the integrated starter generator where it charges the energy storage unit without any frictional energy loss.
[00045] The invention helps in overcoming the problem of space constraint in the vehicle while maintaining conventional layout of the vehicle that is length and width of the vehicle and ultimately makes it cost effective. Additionally, the layout configuration as per present invention enables compact dimensions, packaging, distribution, enhanced riding performance and faster system response time.
[00046] Advantageously, the embodiments of the present invention, describes the potential modifications in the securely mounting of the components in the hybrid vehicle.
[00047] Many other improvements and modifications may be incorporated herein without deviating from the scope of the invention.
List of reference symbol:
Fig. 1:
100: Step through Type Vehicle.
126: Handle Bar Assembly
119: Instrument Cluster
127: Head Lamp
111: Front Side Indicator 104: Daytime Running Lamp
112: A leg Shield 131: A front F ender 129: Front Wheel 130: Front Suspension
113: Brake Lever 103: Fuel Tank 114: Fuel cap 118: Cover Member 123: Cylinder Head
124: Cylinder 122: Engine Assembly 125: Engine
132 (132a, 132b): Seat Assembly 101: Mono-tube frame
109: Grab Rail 106: Tail Lamp 105: License Plate 102: Rear Side Indicator 128: Rear Fender
116: Reflector 135: Rear Suspension
133: Rear Wheel 134: Swing Arm 121: Transmission System 120: Center Stand
110: Tool Box C-C’: Cylinder Axis Fig. 2
201: Crankshaft 211: Primary Drive Gear
210: Clutch Drum 202: Motor 203: Cam Clutch 204: centrifugal Clutch 205: Drive Shaft
206: Primary Driven Gear 207: Electric Motor Assembly 208: Motor Drive Gear 209: Motor Driven Gear Fig. 2a
CC’ : Cylinder Axis 214: Crankcase
212: Integrated Starter Generator
Fig. 2b
213: Shoe

Claims

WE CLAIM:
1. A hybrid powertrain unit (135) for a for a two wheeled vehicle (100), said hybrid powertrain unit (100) comprising of : an engine assembly (122); an electric motor assembly (207) includes a motor drive gear (208) and a motor driven gear (209); and a transmission assembly (121); said electric motor assembly (207) being disposed laterally at least partially offset with respect to a cylinder axis (CC’) and within lateral boundary limits XI and X2 of said engine assembly (122); said electric motor assembly (207) being rigidly attached with a drive shaft (205) of said transmission assembly (121) and said motor drive gear (208) and said motor driven gear (209) of said electric motor assembly (207) with a one way bearing.
2. The hybrid power unit (135) as claimed in claim 1, wherein said transmission assembly (121) includes a cam clutch (203), a centrifugal clutch (204), where said cam clutch (203), said centrifugal clutch (204) being disposed on a crankshaft (201) of said engine assembly (122).
3. The hybrid power unit (135) as claimed in claim 1, wherein said centrifugal clutch (204) includes a shoe (213), where said shoe (213) being engaged with a clutch drum (210) of said transmission assembly (121).
4. The hybrid power unit (135) as claimed in claim 1, wherein said transmission assembly (121) includes a primary drive gear (211) and a clutch drum (210), where said primary drive gear (211) being rigidly attached to said clutch drum (210) in said vehicle.
5. The hybrid power unit (135) as claimed in claim 1 or 4, wherein said transmission assembly (121) includes a primary drive gear (211), wherein said primary drive gear (211) being attached with said drive shaft (205) of said transmission assembly (121) and said primary drive gear (211) and primary driven gear (206) being coupled with each other, for transferring power to said vehicle, in engine and hybrid mode of said vehicle (100).
6. The hybrid power unit (135) as claimed in claim 1, wherein said electric motor assembly (207) includes a motor drive gear (208) and motor driven gear (209), where said motor drive gear (208) and motor driven gear (209) being coupled with each other for transferring power to said drive shaft (206) in EV and hybrid mode of said vehicle (100).
7. The hybrid power unit (135) as claimed in claim 1 or 3, wherein said hybrid power unit (135) includes a motor (202), wherein said motor (202) actuates said cam clutch (203) to engage said centrifugal clutch (204) with said clutch drum (210) at switch over of said vehicle from ev mode to hybrid mode.
8. A hybrid powertrain unit (135) for a vehicle (100), said hybrid power unit (100) comprising of : an engine assembly (122); an integrated starter generator (212); a transmission assembly (121); and said integrated starter generator (212) being disposed laterally offset with respect to a cylinder axis (CC’) and being rigidly coupled with a drive shaft (205) of said transmission assembly (121).
9. The hybrid power unit (135) as claimed in claim 1, wherein said integrated starter generator (212) being housed inside a crankcase (214) of said engine assembly (122).
PCT/IN2022/050259 2021-03-31 2022-03-17 Hybrid powertrain WO2022208529A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202141015356 2021-03-31
IN202141015356 2021-03-31

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080035397A1 (en) * 2006-08-11 2008-02-14 Yamaha Hatsudoki Kabushiki Kaisha Power control for hybrid motorcycle
US20100236856A1 (en) * 2009-03-21 2010-09-23 Akifumi Nomura Hybrid vehicle
WO2019021228A1 (en) * 2017-07-26 2019-01-31 Tvs Motor Company Limited A transmission system for a two-wheeled vehicle
EP3604013A1 (en) * 2017-03-22 2020-02-05 Kawasaki Jukogyo Kabushiki Kaisha Hybrid vehicle
WO2020183566A1 (en) * 2019-03-11 2020-09-17 本田技研工業株式会社 Saddled vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080035397A1 (en) * 2006-08-11 2008-02-14 Yamaha Hatsudoki Kabushiki Kaisha Power control for hybrid motorcycle
US20100236856A1 (en) * 2009-03-21 2010-09-23 Akifumi Nomura Hybrid vehicle
EP3604013A1 (en) * 2017-03-22 2020-02-05 Kawasaki Jukogyo Kabushiki Kaisha Hybrid vehicle
WO2019021228A1 (en) * 2017-07-26 2019-01-31 Tvs Motor Company Limited A transmission system for a two-wheeled vehicle
WO2020183566A1 (en) * 2019-03-11 2020-09-17 本田技研工業株式会社 Saddled vehicle

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