WO2016201705A1 - Electric vehicle and driving system for electric vehicle - Google Patents

Electric vehicle and driving system for electric vehicle Download PDF

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Publication number
WO2016201705A1
WO2016201705A1 PCT/CN2015/081968 CN2015081968W WO2016201705A1 WO 2016201705 A1 WO2016201705 A1 WO 2016201705A1 CN 2015081968 W CN2015081968 W CN 2015081968W WO 2016201705 A1 WO2016201705 A1 WO 2016201705A1
Authority
WO
WIPO (PCT)
Prior art keywords
output shaft
electric vehicle
driving system
gearbox
motor
Prior art date
Application number
PCT/CN2015/081968
Other languages
French (fr)
Inventor
Tao Zhu
Weiya Li
Qilin Huang
Xiaoyun Zang
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to PCT/CN2015/081968 priority Critical patent/WO2016201705A1/en
Priority to JP2017565727A priority patent/JP6865699B2/en
Priority to US15/737,800 priority patent/US10464633B2/en
Priority to EP15895278.8A priority patent/EP3310645B1/en
Priority to CN201580081018.1A priority patent/CN107709147B/en
Publication of WO2016201705A1 publication Critical patent/WO2016201705A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M7/00—Motorcycles characterised by position of motor or engine
    • B62M7/12—Motorcycles characterised by position of motor or engine with the engine beside or within the driven wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K25/28—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay
    • B62K25/283—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay for cycles without a pedal crank, e.g. motorcycles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/02—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of unchangeable ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/20—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/025—Support of gearboxes, e.g. torque arms, or attachment to other devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/031—Gearboxes; Mounting gearing therein characterised by covers or lids for gearboxes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/006—Structural association of a motor or generator with the drive train of a motor vehicle
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0038—Disposition of motor in, or adjacent to, traction wheel the motor moving together with the wheel axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0092—Disposition of motor in, or adjacent to, traction wheel the motor axle being coaxial to the wheel axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K2204/00—Adaptations for driving cycles by electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K25/12—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg
    • B62K25/22—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg with more than one arm on each fork leg
    • B62K25/26—Axle suspensions for mounting axles resiliently on cycle frame or fork with rocking arm pivoted on each fork leg with more than one arm on each fork leg for rear wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02034—Gearboxes combined or connected with electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the invention relates to an electric vehicle, in particular to a driving system for an electric vehicle.
  • a commonly used driving system for an electric vehicle generally comprises a motor and a gearbox. Specially, the motor drives a wheel of the electric vehicle by means of the gearbox.
  • both the motor and the gearbox are disposed inside of a rim of the wheel of the electric vehicle, and the gears of the gearbox are disposed around an output shaft of the motor.
  • both the motor and the gearbox are disposed outside of a rim of the wheel of the electric vehicle, and the motor is disposed to be offset to the gearbox.
  • the planetary gear in-wheel driving system has a compact size by disposing the motor and the gearbox in the same housing and a good balancing by distributing symmetrically the weight of the gears of the gearbox about the output shaft of the motor.
  • the near wheel driving system can produce larger power density due to improved cooling performance and achieve a high efficiency.
  • the near wheel driving system is often selected for high power vehicles due to its larger power density.
  • the motor and the gearbox are disposed to be offset to each other so that the balancing of the near wheel driving system and thus the vehicles is very poor, which further cause difficulty in controlling the vehicles and degradation in riding comfort.
  • the motor and the gearbox substantially protrude outside of the wheel, which adversely affects the passing ability and the visual appearance of the vehicle.
  • An object of the present invention is to overcome at least one of the abovementioned defects of the existing driving system for the electric vehicle.
  • the present invention provides a driving system for an electric vehicle which substantially improves the balancing, the passing ability and the visual appearance of the electric vehicle.
  • a driving system for an electric vehicle comprising:
  • a motor comprising a first output shaft
  • a gearbox comprising a second output shaft attachable to a wheel of the electric vehicle, the first output shaft being capable of driving the second output shaft to rotate by engagement of gears of the gearbox;
  • first output shaft is hollow, and the second output shaft extends through the first output shaft so that the second output shaft is disposed coaxially with the first output shaft.
  • the motor further comprises a motor housing, a stator disposed fixedly within the motor housing, and a rotor disposed rotatably within a central space defined by the stator, the first output shaft is fixed onto the rotor and supported rotatably by the motor housing to be rotatable with the rotor.
  • the gearbox comprises a gearbox housing, at least two pair of gears engaged with each other and at least one transmission shaft supported rotatably by the gearbox housing, the first output shaft extends into the gearbox housing so that a gear having a smaller diameter of a first pair of gears of the at least two pair of gears is fixed onto the first output shaft, a gear having a larger diameter of a last pair of gears of the at least two pair of gears is fixed onto the second output shaft supported rotatably, and the other gears of the at least two pair of gears are fixed onto the at least one transmission shaft.
  • the motor comprises a motor housing having a main body and an end cover attached to the main body
  • the gearbox comprises a gearbox housing having a main body and an end cover attached to the main body
  • the main body of the motor housing and the main body of the gearbox housing are formed into an unitary unit or piece.
  • the second output shaft is configured to be attached to a rim of the wheel by means of an adaptor, the rim and the gearbox are positioned either side of the motor so that the motor is at least partially positioned within a space defined by the rim when the driving system is attached to the rim.
  • the rim is designed so that a majority of the motor is positioned within the space defined by the rim.
  • an attachment point for attaching the driving system to a frame of the electric vehicle is formed on the gearbox.
  • an electric vehicle comprises a driving system as stated.
  • the electric vehicle is an electric motorcycle or an electric car.
  • FIG. 1 is a side view showing schematically a driving system for an electric vehicle according to a preferred embodiment of the present invention being mounted onto a wheel of the electric vehicle.
  • FIG. 2 is a bottom view of the driving system shown in FIG. 1.
  • FIG. 3 is a sectional view taken along a line 3-3 of FIG. 1.
  • FIGS. 4 and 5 are perspective views showing schematically that a swing arm for attaching the wheel and the driving system to a frame of the electric vehicle is attached to the driving system shown in FIG. 1
  • FIG. 1 is a side view showing schematically a driving system for an electric vehicle according to a preferred embodiment of the present invention being mounted onto a wheel of the electric vehicle
  • FIG. 2 is a bottom view of the driving system shown in FIG. 1
  • FIG. 3 is a sectional view taken along a line 3-3 of FIG. 1.
  • a driving system 1 for an electric vehicle according to a preferred embodiment of the present invention comprises a motor 3 having a motor housing 5, a stator 7 disposed fixedly within the motor housing 5, a rotor 9 disposed rotatably within the motor housing 5, and a first output shaft 11 rotatable with the rotor 9.
  • the motor housing 5 comprises a main body 5a and an end cover 5b attached to the main body 5a.
  • the stator 7 comprises a stator core 7a and a stator winding 7b wound on the stator core 7a.
  • the first output shaft 11 is hollow, extends centrally through the rotor 9 and is fixed onto the rotor 9.
  • the first output shaft 11 is supported rotatably at two ends by a first pair of bearings 13a, 13b disposed in the main body 5a and the end cover 5b of the motor housing 5 respectively so that the rotor 9 mounted fixedly onto the first output shaft 11 is disposed rotatably within a central space defined by the stator 7.
  • the driving system 1 for an electric vehicle further comprises a gearbox 17 having a gearbox housing 19, a first pair of gears 21a, 21b engaged with each other, a second pair of gears 23a, 23b engaged with each other, a transmission shaft 25, and a second output shaft 27.
  • Each of the pair of gears has different diameter to reduce a rotating speed of the second output shaft 27.
  • the gearbox housing 19 comprises a main body 19a and an end cover 19b attached to the main body 19a.
  • the first output shaft 11 of the motor 3 extends into the gearbox housing 19 so that a gear 21a having a smaller diameter of the first pair of gears 21a, 21b is fixed onto the first output shaft 11 of the motor 3.
  • a gear 21b having a larger diameter of the first pair of gears 21a, 21b is fixed onto the transmission shaft 25 which is supported rotatably at two ends by a second pair of bearings 29a, 29b disposed in the main body 19a and the end cover 19b of the gearbox housing 19 respectively.
  • a gear 23a having a smaller diameter of the second pair of gears 23a, 23b is also fixed onto the transmission shaft 25.
  • the second output shaft 27 of the gearbox 17 extends through the first output shaft 11 of the motor 3 which is hollow so that the second output shaft 27 of the gearbox 17 is disposed coaxially with the first output shaft 11.
  • the second output shaft 27 is supported rotatably at two ends by a third pair of bearings 31a, 31b disposed in the end cover 5b of the motor housing 5 and the end cover 19b of the gearbox housing 19 respectively.
  • a gear 23b having a larger diameter of the second pair of gears 23a, 23b is fixed onto a first end 27a of the second output shaft 27.
  • a second end 27b opposite to the first end 27a of the second output shaft 27 protrudes out of the first output shaft 11 of the motor 3.
  • the second end 27b of the second output shaft 27 may be attached to a wheel 33 of the electric vehicle.
  • the wheel 33 comprises a rim 35 and a tire 37 which is fitted around the rim 33.
  • the second end 27b of the second output shaft 27 is attached fixedly to the rim 35 by means of an adaptor 39.
  • a disc brake 41 may be fitted onto the adaptor 39 to stop the wheel 33 by clamping the disc brake 41 with a braking clipper (not shown in the drawings) . It should be understood that the disc brake 41 may be replaced with a drum brake or other braking system.
  • the motor housing 5 and the gearbox housing 19 may be formed separately from each other and then be assembled together, it is preferred that the main body 5a of the motor housing 5 and the main body 19a of the gearbox housing 19 are formed into an unitary unit or piece to simplify the assembling process and reduce the material and the cost.
  • the gearbox 17 is shown to include a two-stage reduction gear set. It should be understood that it is possible to use a more than two-stage reduction gear set.
  • the first pair of gears 21a, 21b and the second pair of gears 23a, 23b may be any applicable gear pairs, for example helical gear pairs.
  • FIGS. 4 and 5 are perspective views showing schematically that a swing arm for attaching the wheel and the driving system to a frame of the electric vehicle is attached to the driving system shown in FIG. 1.
  • the wheel and the driving system are shown to be attached to a frame (not shown in the drawings) of an electric motorcycle.
  • a swing arm 45 for attaching the wheel and the driving system to the frame of the electric vehicle is fork-shaped.
  • the rear end of fork-shaped swing arm 45 is attached at one side to an attachment point 43 formed on the gearbox 17 and at the other side to the second output shaft 27 by means of a support bearing (invisible in the drawings).
  • the front end of fork-shaped swing arm 45 may be attached to the frame of the electric vehicle.
  • a shock absorber 47 may be disposed between the fork-shaped swing arm 45 and the frame of the electric vehicle to damp the vibration during travelling of the vehicle. It should be understood that the driving system for the electric vehicle according to the present invention is applicable to the electric vehicle other than the electric motorcycle, for example an electric car.
  • the operation of the driving system 1 for the electric vehicle according to the present invention will be described in detail.
  • the first output shaft 11 of the motor 3 rotates with the rotor 9.
  • the first output shaft 11 of the motor 3 drives the transmission shaft 25 to rotate by means of engagement of the first pair of gears 21a, 21b.
  • the transmission shaft 25 further drives the second output shaft 27 to rotate by means of engagement of the second pair of gears 23a, 23b.
  • the second output shaft 27 attached fixedly to the rim 35 further drives the wheel 33 of the electric vehicle, thereby driving finally the electric vehicle to run a road.
  • the second output shaft 27 of the gearbox 17 extends through the first output shaft 11 of the motor 3 so that the wheel 33 and the gearbox 17 are positioned either side of the motor 3, which causes a more uniform and symmetrical distribution of the weight of the driving system 1 attached to the wheel of the electric vehicle, thereby substantially improving the balancing of the driving system and thus the electric vehicle.
  • the motor 3 is at least partially positioned within a space defined by the rim, which reduces the size of the electric vehicle fitted with the driving system according to the present invention, thereby improving the passing ability and the visual appearance of the electric vehicle. Even for a driving system with a large power density and an increased size, a majority of the motor of the driving system also may be positioned within the space defined by the rim by designing the shape of the rim.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

A driving system for an electric vehicle comprises a motor (3) comprising a first output shaft (11) and a gearbox (17) comprising a second output shaft (27) attachable to a wheel (33) of the electric vehicle. The first output shaft (11) is capable of driving the second output shaft (27) to rotate by engagement of gears of the gearbox (17). The first output shaft (11) is hollow, and the second output shaft (27) extends through the first output shaft (11) so that the second output shaft (27) is disposed coaxially with the first output shaft (11). An electric vehicle comprising the driving system is disclosed. The driving system is possible to improve the balancing, the passing ability and the visual appearance of the electric vehicle.

Description

Electric vehicle and driving system for electric vehicle FIELD OF THE INVENTION
The invention relates to an electric vehicle, in particular to a driving system for an electric vehicle.
BACKGROUND OF THE INVENTION
With heavier and heavier environmental pollution, people pay more and more attention to environmental protection. Electric vehicles use or mainly use electric power to drive its wheels to rotate. Thus, it is expected that electric vehicles will be more widely used in near future because they are more environmentally friendly than the conventional vehicles. A commonly used driving system for an electric vehicle generally comprises a motor and a gearbox. Specially, the motor drives a wheel of the electric vehicle by means of the gearbox.
It is well-known that there are two common driving systems for electric vehicle: planetary gear in-wheel driving system and near wheel driving system. In a planetary gear in-wheel driving system, both the motor and the gearbox are disposed inside of a rim of the wheel of the electric vehicle, and the gears of the gearbox are disposed around an output shaft of the motor. In a near wheel driving system, both the motor and the gearbox are disposed outside of a rim of the wheel of the electric vehicle, and the motor is disposed to be offset to the gearbox. Compared with the near wheel driving system, the planetary gear in-wheel driving system has a compact size by disposing the motor and the gearbox in the same housing and a good balancing by distributing symmetrically the weight of the gears of the gearbox about the output shaft of the motor. The near wheel driving system can produce larger power density due to improved cooling performance and achieve a high efficiency. The near wheel driving system is often selected for high power vehicles due to its larger power density. However, in the existing near wheel driving  system, the motor and the gearbox are disposed to be offset to each other so that the balancing of the near wheel driving system and thus the vehicles is very poor, which further cause difficulty in controlling the vehicles and degradation in riding comfort. Further, in the near wheel driving system, the motor and the gearbox substantially protrude outside of the wheel, which adversely affects the passing ability and the visual appearance of the vehicle. These problems are more obvious for the near wheel driving system with larger power density due to an increased size of the motor, especially for the near wheel driving system designed for an electric motorcycle (also referred to an electric scooter).
Thus, there is a need to make improvements on the existing driving system for the electric vehicle.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome at least one of the abovementioned defects of the existing driving system for the electric vehicle. To this end, the present invention provides a driving system for an electric vehicle which substantially improves the balancing, the passing ability and the visual appearance of the electric vehicle.
According to an aspect of the present invention, it is to provide a driving system for an electric vehicle comprising:
a motor comprising a first output shaft； and
a gearbox comprising a second output shaft attachable to a wheel of the electric vehicle, the first output shaft being capable of driving the second output shaft to rotate by engagement of gears of the gearbox；
wherein the first output shaft is hollow, and the second output shaft extends through the first output shaft so that the second output shaft is disposed coaxially with the first output shaft.
Preferably, the motor further comprises a motor housing, a stator disposed fixedly within the motor housing, and a rotor disposed rotatably within a central space defined by the stator, the first output shaft is fixed onto the rotor and supported rotatably by the motor housing to be rotatable with the rotor.
Preferably, the gearbox comprises a gearbox housing, at least two pair of gears engaged with each other and at least one transmission shaft supported rotatably by the gearbox housing, the first output shaft extends into the gearbox housing so that a gear having a smaller diameter of a first pair of gears of the at least two pair of gears is fixed onto the first output shaft, a gear having a larger diameter of a last pair of gears of the at least two pair of gears is fixed onto the second output shaft supported rotatably, and the other gears of the at least two pair of gears are fixed onto the at least one transmission shaft.
Preferably, the motor comprises a motor housing having a main body and an end cover attached to the main body, the gearbox comprises a gearbox housing having a main body and an end cover attached to the main body, and the main body of the motor housing and the main body of the gearbox housing are formed into an unitary unit or piece.
Preferably, the second output shaft is configured to be attached to a rim of the wheel by means of an adaptor, the rim and the gearbox are positioned either side of the motor so that the motor is at least partially positioned within a space defined by the rim when the driving system is attached to the rim.
Preferably, the rim is designed so that a majority of the motor is positioned within the space defined by the rim.
Preferably, an attachment point for attaching the driving system to a frame of the electric vehicle is formed on the gearbox.
According to another aspect of the present invention, it is to provide an electric vehicle comprises a driving system as stated.
Preferably, the electric vehicle is an electric motorcycle or an electric car.
These and other objects, features and characteristics of the present invention, as well as the methods of operation and functions of the related elements of structure and the combination of parts and economies of manufacture, will become more apparent upon consideration of the following description and the appended claims with reference to the accompanying drawings, all of which form a part of this specification, wherein like reference numerals designate corresponding parts in the various figures. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view showing schematically a driving system for an electric vehicle according to a preferred embodiment of the present invention being mounted onto a wheel of the electric vehicle.
FIG. 2 is a bottom view of the driving system shown in FIG. 1.
FIG. 3 is a sectional view taken along a line 3-3 of FIG. 1.
FIGS. 4 and 5 are perspective views showing schematically that a swing arm for attaching the wheel and the driving system to a frame of the electric vehicle is attached to the driving system shown in FIG. 1
DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
Preferred embodiments of the present invention are described in detail with reference to illustrative examples hereinafter. For those skilled in the art, it should be understood that  embodiments are only for the purpose of illustrating and are not to be construed as limiting the present invention.
FIG. 1 is a side view showing schematically a driving system for an electric vehicle according to a preferred embodiment of the present invention being mounted onto a wheel of the electric vehicle, FIG. 2 is a bottom view of the driving system shown in FIG. 1, and FIG. 3 is a sectional view taken along a line 3-3 of FIG. 1. As shown in FIGS. 1-3, a driving system 1 for an electric vehicle according to a preferred embodiment of the present invention comprises a motor 3 having a motor housing 5, a stator 7 disposed fixedly within the motor housing 5, a rotor 9 disposed rotatably within the motor housing 5, and a first output shaft 11 rotatable with the rotor 9. The motor housing 5 comprises a main body 5a and an end cover 5b attached to the main body 5a. The stator 7 comprises a stator core 7a and a stator winding 7b wound on the stator core 7a. The first output shaft 11 is hollow, extends centrally through the rotor 9 and is fixed onto the rotor 9. The first output shaft 11 is supported rotatably at two ends by a first pair of  bearings  13a, 13b disposed in the main body 5a and the end cover 5b of the motor housing 5 respectively so that the rotor 9 mounted fixedly onto the first output shaft 11 is disposed rotatably within a central space defined by the stator 7.
The driving system 1 for an electric vehicle according to a preferred embodiment of the present invention further comprises a gearbox 17 having a gearbox housing 19, a first pair of  gears  21a, 21b engaged with each other, a second pair of  gears  23a, 23b engaged with each other, a transmission shaft 25, and a second output shaft 27. Each of the pair of gears has different diameter to reduce a rotating speed of the second output shaft 27. The gearbox housing 19 comprises a main body 19a and an end cover 19b attached to the main body 19a. The first output shaft 11 of the motor 3 extends into the gearbox housing 19 so that a gear 21a having a smaller diameter of the first pair of  gears  21a, 21b is fixed onto the first output shaft 11 of the motor 3. A gear 21b having a larger diameter of the first pair of  gears  21a, 21b is fixed onto the transmission shaft 25 which is supported rotatably at two ends by a second pair of  bearings  29a, 29b disposed in the main body 19a and the end cover 19b of the gearbox housing 19 respectively. A gear 23a  having a smaller diameter of the second pair of  gears  23a, 23b is also fixed onto the transmission shaft 25. The second output shaft 27 of the gearbox 17 extends through the first output shaft 11 of the motor 3 which is hollow so that the second output shaft 27 of the gearbox 17 is disposed coaxially with the first output shaft 11. The second output shaft 27 is supported rotatably at two ends by a third pair of  bearings  31a, 31b disposed in the end cover 5b of the motor housing 5 and the end cover 19b of the gearbox housing 19 respectively. A gear 23b having a larger diameter of the second pair of  gears  23a, 23b is fixed onto a first end 27a of the second output shaft 27. A second end 27b opposite to the first end 27a of the second output shaft 27 protrudes out of the first output shaft 11 of the motor 3.
The second end 27b of the second output shaft 27 may be attached to a wheel 33 of the electric vehicle. The wheel 33 comprises a rim 35 and a tire 37 which is fitted around the rim 33. The second end 27b of the second output shaft 27 is attached fixedly to the rim 35 by means of an adaptor 39. A disc brake 41 may be fitted onto the adaptor 39 to stop the wheel 33 by clamping the disc brake 41 with a braking clipper (not shown in the drawings) . It should be understood that the disc brake 41 may be replaced with a drum brake or other braking system.
Although the motor housing 5 and the gearbox housing 19 may be formed separately from each other and then be assembled together, it is preferred that the main body 5a of the motor housing 5 and the main body 19a of the gearbox housing 19 are formed into an unitary unit or piece to simplify the assembling process and reduce the material and the cost. Further, in the preferred embodiment, the gearbox 17 is shown to include a two-stage reduction gear set. It should be understood that it is possible to use a more than two-stage reduction gear set. The first pair of  gears  21a, 21b and the second pair of  gears  23a, 23b may be any applicable gear pairs, for example helical gear pairs.
FIGS. 4 and 5 are perspective views showing schematically that a swing arm for attaching the wheel and the driving system to a frame of the electric vehicle is attached to the driving system shown in FIG. 1. In the example of FIGS 4 and 5, the wheel and the driving system are shown to  be attached to a frame (not shown in the drawings) of an electric motorcycle. A swing arm 45 for attaching the wheel and the driving system to the frame of the electric vehicle is fork-shaped. The rear end of fork-shaped swing arm 45 is attached at one side to an attachment point 43 formed on the gearbox 17 and at the other side to the second output shaft 27 by means of a support bearing (invisible in the drawings). The front end of fork-shaped swing arm 45 may be attached to the frame of the electric vehicle. A shock absorber 47 may be disposed between the fork-shaped swing arm 45 and the frame of the electric vehicle to damp the vibration during travelling of the vehicle. It should be understood that the driving system for the electric vehicle according to the present invention is applicable to the electric vehicle other than the electric motorcycle, for example an electric car.
The operation of the driving system 1 for the electric vehicle according to the present invention will be described in detail. When a current is supplied to the motor 3, the first output shaft 11 of the motor 3 rotates with the rotor 9. The first output shaft 11 of the motor 3 drives the transmission shaft 25 to rotate by means of engagement of the first pair of  gears  21a, 21b. The transmission shaft 25 further drives the second output shaft 27 to rotate by means of engagement of the second pair of  gears  23a, 23b. The second output shaft 27 attached fixedly to the rim 35 further drives the wheel 33 of the electric vehicle, thereby driving finally the electric vehicle to run a road.
As shown in FIG. 3, the second output shaft 27 of the gearbox 17 extends through the first output shaft 11 of the motor 3 so that the wheel 33 and the gearbox 17 are positioned either side of the motor 3, which causes a more uniform and symmetrical distribution of the weight of the driving system 1 attached to the wheel of the electric vehicle, thereby substantially improving the balancing of the driving system and thus the electric vehicle. The motor 3 is at least partially positioned within a space defined by the rim, which reduces the size of the electric vehicle fitted with the driving system according to the present invention, thereby improving the passing ability and the visual appearance of the electric vehicle. Even for a driving system with a large power  density and an increased size, a majority of the motor of the driving system also may be positioned within the space defined by the rim by designing the shape of the rim.
While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive. The invention is not limited to the disclosed embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing a claimed invention, from a study of the drawings, the disclosure, and the dependent claims.
In the claims, the word “comprising” does not exclude other elements or steps, and the indefinite article “a” or “an” does not exclude a plurality. A single processor or other unit may fulfil the functions of several items re-cited in the claims. The mere fact that certain measures are re-cited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.

Claims (10)

  1. A driving system (1) for an electric vehicle comprising:
    a motor (3) comprising a first output shaft (11) ； and
    a gearbox (17) comprising a second output shaft (27) attachable to a wheel (33) of the electric vehicle, the first output shaft (11) being capable of driving the second output shaft (27) to rotate by engagement of gears of the gearbox (17) ；
    wherein the first output shaft (11) is hollow, and the second output shaft (27) extends through the first output shaft (11) so that the second output shaft (27) is disposed coaxially with the first output shaft (11) .
  2. The driving system (1) for the electric vehicle according to claim 1, wherein the motor (3) further comprises a motor housing (5) , a stator (7) disposed fixedly within the motor housing (5) , and a rotor (9) disposed rotatably within a central space defined by the stator (7) , the first output shaft (11) is fixed onto the rotor (9) and supported rotatably by the motor housing (5) to be rotatable with the rotor (9) .
  3. The driving system (1) for the electric vehicle according to claim 1, wherein the gearbox (17) comprises a gearbox housing (19) , at least two pair of gears (21a, 21b, 23a, 23b) engaged with each other and at least one transmission shaft (25) supported rotatably by the gearbox housing (19) , the first output shaft (11) extends into the gearbox housing (19) so that a gear (21a) having a smaller diameter of a first pair of gears of the at least two pair of gears is fixed onto the first output shaft (11) , a gear (23b) having a larger diameter of a last pair of gears of the at least two pair of gears is fixed onto the second output shaft (27) supported rotatably, and the other gears of the at least two pair of gears are fixed onto the at least one transmission shaft (25) .
  4. The driving system (1) for the electric vehicle according to claim 1, wherein the motor (3) comprises a motor housing (5) having a main body (5a) and an end cover (5b) attached to the  main body (5a) , the gearbox (17) comprises a gearbox housing (19) having a main body (19a) and an end cover (19b) attached to the main body (19a) , and the main body (5a) of the motor housing (5) and the main body (19a) of the gearbox housing (19) are formed into an unitary unit or piece.
  5. The driving system (1) for the electric vehicle according to claim 1, wherein the second output shaft (27) is configured to be attached to a rim (35) of the wheel (33) by means of an adaptor (39) , the rim (35) and the gearbox (17) are positioned either side of the motor (3) so that the motor (3) is at least partially positioned within a space defined by the rim (35) when the driving system (1) is attached to the rim (35) .
  6. The driving system (1) for the electric vehicle according to claim 5, wherein the rim (35) is designed so that a majority of the motor (3) is positioned within the space defined by the rim (35) .
  7. The driving system (1) for the electric vehicle according to claim 1, wherein an attachment point (43) for attaching the driving system (1) to a frame of the electric vehicle is formed on the gearbox (17) .
  8. An electric vehicle comprises a driving system (1) according to any one of claims 1-7.
  9. The electric vehicle according to claim 8, wherein the electric vehicle is an electric motorcycle.
  10. The electric vehicle according to claim 8, wherein the electric vehicle is an electric car.
PCT/CN2015/081968 2015-06-19 2015-06-19 Electric vehicle and driving system for electric vehicle WO2016201705A1 (en)

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JP2017565727A JP6865699B2 (en) 2015-06-19 2015-06-19 Drive systems for electric vehicles and electric vehicles
US15/737,800 US10464633B2 (en) 2015-06-19 2015-06-19 Electric vehicle and driving system for electric vehicle
EP15895278.8A EP3310645B1 (en) 2015-06-19 2015-06-19 Electric vehicle and driving system for electric vehicle
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JP6865699B2 (en) 2021-04-28
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CN107709147A (en) 2018-02-16
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US20190002056A1 (en) 2019-01-03
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EP3310645A1 (en) 2018-04-25
EP3310645A4 (en) 2019-02-27

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