CN103072474A - 双电机驱动***及其驱动方式 - Google Patents

双电机驱动***及其驱动方式 Download PDF

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CN103072474A
CN103072474A CN2012105208308A CN201210520830A CN103072474A CN 103072474 A CN103072474 A CN 103072474A CN 2012105208308 A CN2012105208308 A CN 2012105208308A CN 201210520830 A CN201210520830 A CN 201210520830A CN 103072474 A CN103072474 A CN 103072474A
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motor
number shelves
electrical motor
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change speed
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张农
朱波
方煜宏
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Changzhou wisdom Auto Parts Technology Co., Ltd.
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Changzhou Wan'an Automobile Parts Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/02—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of clutch
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
    • B60K17/08—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing of mechanical type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F16H37/065—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with a plurality of driving or driven shafts
    • 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
    • F16H2200/00—Transmissions for multiple ratios
    • F16H2200/0021—Transmissions for multiple ratios specially adapted for electric vehicles
    • 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
    • F16H2200/00—Transmissions for multiple ratios
    • F16H2200/003—Transmissions for multiple ratios characterised by the number of forward speeds
    • F16H2200/0034—Transmissions for multiple ratios characterised by the number of forward speeds the gear ratios comprising two forward speeds
    • 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
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
    • F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
    • F16H3/087—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears
    • F16H3/089—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears all of the meshing gears being supported by a pair of parallel shafts, one being the input shaft and the other the output shaft, there being no countershaft involved

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Structure Of Transmissions (AREA)

Abstract

本发明公开了一种双电机驱动***及其驱动方式，包括：第一电动机、第二电动机、变速箱，所述第一电动机的输出轴与所述变速箱的第一输入轴连接，第二电动机的输出轴与所述变速箱的第二输入轴连接，所述变速箱内设有至少3档结构，偶数档分布在变速箱的第一输入轴上，奇数档分布在变速箱的第二输入轴上，所述偶数档之间通过偶数档同步器连接，所述奇数档之间通过奇数档同步器连接。通过上述方式，本发明结构简单，无离合器即可实现换档，易于实现，通过两个电机的驱动组合控制,即可实现动力性和经济性的优化组合；且换档通过双电机切换控制实现，无动力中断，舒适性好。

Description

双电机驱动***及其驱动方式
技术领域
本发明涉及动力驱动领域，特别是涉及一种双电机驱动***及其驱动方式。 
背景技术
随着能源短缺和环境污染问题的日益严峻，电动汽车目前被国内外普遍认为是汽车工业发展的方向，其大规模推广应用不仅可以节能减排，改善人们的生活质量，而且是许多国家摆脱对石油过度依赖、解决国家能源安全的重要举措。 
现有的纯电动电驱动***方案，按照变速方案分为两种，一种是采用单极减速装置的驱动***，没有变速箱，采用单级减速齿轮实现减速， 通过电机的调速来实现无级调速，但是由于无变速功能，很难兼顾加速时间与最高车速的矛盾，且在常用工况运行时，很难优化电机的工作区间以改善驱动***效率；另外一种方案是采用多档变速器的驱动方案，该方案能够很好的解决上述问题，但是使得驱动***结构复杂， 驱动效率降低，成本增加。且换档多需要离合器控制，会增加换档冲击，降低车辆舒适性能。 
发明内容
本发明主要解决的技术问题是提供一种双电机驱动***及其驱动方式，能够无离合器即可实现换档， 通过两个电机的驱动组合控制， 即可实现动力性和经济性的优化组合。 
为解决上述技术问题，本发明采用的一个技术方案是：提供一种双电机驱动***，包括：第一电动机、第二电动机、变速箱，所述第一电动机的输出轴与所述变速箱的第一输入轴连接，第二电动机的输出轴与所述变速箱的第二输入轴连接，所述变速箱内设有至少3档结构，偶数档分布在变速箱的第一输入轴上，奇数档分布在变速箱的第二输入轴上，所述偶数档之间通过偶数档同步器连接，所述奇数档之间通过奇数档同步器连接。 
在本发明一个较佳实施例中，所述变速箱的输出轴上设有主减速器，所述主减速器与一差速器连接。 
在本发明一个较佳实施例中，所述变速箱内设有5档或6档结构。 
在本发明一个较佳实施例中，所述第一电动机与第二电动机均包括发电模式、电动模式。 
还涉及一种双电机驱动***的驱动方式，包括： 
电机驱动模式，包括单电机驱动或双电机驱动；单电机驱动，选择第一电动机或第二电动机单独驱动，分别选择偶数档或奇数档驱动；双电机驱动，选择偶数档和奇数档驱动；
电机倒车模式，通过电机反转实现单电机倒车或双电机倒车，单电机倒车，选择第一电动机或第二电动机单独驱动，分别选择偶数档或奇数档倒车；双电机倒车，选择偶数档和奇数档倒车；
制动能量回收模式，第一电动机与第二电动机均工作在发电模式，包括单电机发电或双电机发电，单电机发电，选择第一电动机或第二电动机单独发电，分别选择偶数档或奇数档发电；双电机发电，选择偶数档和奇数档发电。
本发明的有益效果是：本发明双电机驱动***及其驱动方式可实现单电机驱动和双电机驱动，并可进行驱动档位选择；由于没有倒档轴， 倒车通过电机反转实现，也可以实现单电机倒车和双电机倒车；同时整车制动时，电机工作在发电模式，进行制动能量回收，也可以实现单电机回收或双电机能量回收；结构简单，无离合器即可实现换档，易于实现， 通过两个电机的驱动组合控制, 即可实现动力性和经济性的优化组合；且换档通过双电机切换控制实现，无动力中断，舒适性好。 
附图说明
图1是本发明双电机驱动***一较佳实施例的结构示意图； 
附图中各部件的标记如下：1、第一电动机，2、第二电动机，3、变速箱的第一输入轴，4、变速箱的第二输入轴，5、变速箱的输出轴，6、奇数档同步器，7、偶数档同步器，8、主减速器，9、差速器。
具体实施方式
下面结合附图对本发明的较佳实施例进行详细阐述，以使本发明的优点和特征能更易于被本领域技术人员理解，从而对本发明的保护范围做出更为清楚明确的界定。 
请参阅图1， 
本发明实施例1：
一种双电机驱动***，包括：第一电动机1、第二电动机2、变速箱，所述第一电动机1输出轴与所述变速箱的第一输入轴3连接，第二电动机2输出轴与所述变速箱的第二输入轴4连接。
所述变速箱内设有3档结构，分别为1档齿轮组、2档齿轮组以及3档齿轮组，1档齿轮组和3档齿轮组设于变速箱的第二输入轴4上，2档齿轮组设于所述变速箱的第一输入轴3上，1档与3档之间通过1/3档同步器，即奇数档同步器6，进行档位切换，所述变速箱的输出轴5上设有主减速器8，所述主减速器8与一差速器9连接。 
本发明实施例2： 
一种双电机驱动***，包括：第一电动机1、第二电动机2、变速箱，所述第一电动机1输出轴与所述变速箱的第一输入轴3连接，第二电动机2输出轴与所述变速箱的第二输入轴4连接。
所述变速箱内设有4档结构，分别为1档齿轮组、2档齿轮组、3档齿轮组以及4档齿轮组，所述1档齿轮组与3档齿轮组设于变速箱的第二输入轴4上，2档齿轮组与4档齿轮组设于变速箱的第一输入轴3上，所述1档齿轮组与3档齿轮组之间设有1/3档同步器，即奇数档同步器6，2档齿轮组与4档齿轮组之间设有2/4档同步器，即偶数档同步器7。所述变速箱的输出轴5上设有主减速器8，所述主减速器8与一差速器9连接。 
根据车型不同，匹配的不同的档位数量，变速箱内可设有5档、6档或更多档位结构。 
上述的所述第一电动机1与第二电动机2均包括发电模式、电动模式。 
以变速箱内的结构为4档结构为例，双电机驱动***能够实现多种模式，包括 
电机驱动模式，驱动时，如果驱动需求功率较小，可选择第一电动机1或第二电动机2单独驱动，以获得良好的驱动经济性能，此时根据所选择驱动电机的不同，可以分别选择1或3档、 2或4档驱动。当大功率驱动需求时，可双电机联合驱动，获得良好的动力性能，此时可选择1或3档和2或4档进行驱动。
电机倒车模式，由于没有倒档轴， 倒车通过电机反转实现，根据倒车需求功率的大小，也可以实现单电机倒车和双电机倒车，驱动方法与电机驱动模式相同。 
制动能量回收模式，第一电动机1与第二电动机2均工作在发电模式，也可以选择单电机发电或双电机发电，驱动方法与电机驱动模式相同。 
具体的驱动方法组合见下表： 
Figure 20121052083081000021
本发明双电机驱动***及其驱动方式可实现单电机驱动和双电机驱动，并可进行驱动档位选择；由于没有倒档轴， 倒车通过电机反转实现，也可以实现单电机倒车和双电机倒车；同时整车制动时，电机工作在发电模式，进行制动能量回收，也可以实现单电机回收或双电机能量回收；结构简单，无离合器即可实现换档，易于实现， 通过两个电机的驱动组合控制， 即可实现动力性和经济性的优化组合；且换档通过双电机切换控制实现，无动力中断，舒适性好。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。 

Claims (5)

1.一种双电机驱动***，其特征在于，包括：第一电动机、第二电动机、变速箱，所述第一电动机的输出轴与所述变速箱的第一输入轴连接，第二电动机的输出轴与所述变速箱的第二输入轴连接，所述变速箱内设有至少3档结构，偶数档分布在变速箱的第一输入轴上，奇数档分布在变速箱的第二输入轴上，所述偶数档之间通过偶数档同步器连接，所述奇数档之间通过奇数档同步器连接。
2.根据权利要求1所述的双电机驱动***，其特征在于，所述变速箱的输出轴上设有主减速器，所述主减速器与一差速器连接。
3.根据权利要求1所述的双电机驱动***，其特征在于，所述变速箱内设有5档或6档结构。
4.根据权利要求1所述的双电机驱动***，其特征在于，所述第一电动机与第二电动机均包括发电模式、电动模式。
5.根据权利要求4所述的双电机驱动***的驱动方式，其特征在于，包括：
电机驱动模式，包括单电机驱动或双电机驱动；单电机驱动，选择第一电动机或第二电动机单独驱动，分别选择偶数档或奇数档驱动；双电机驱动，选择偶数档和奇数档驱动；
电机倒车模式，通过电机反转实现单电机倒车或双电机倒车，单电机倒车，选择第一电动机或第二电动机单独驱动，分别选择偶数档或奇数档倒车；双电机倒车，选择偶数档和奇数档倒车；
制动能量回收模式，第一电动机与第二电动机均工作在发电模式，包括单电机发电或双电机发电，单电机发电，选择第一电动机或第二电动机单独发电，分别选择偶数档或奇数档发电；双电机发电，选择偶数档和奇数档发电。
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CN105508522A (zh) * 2016-02-02 2016-04-20 西安法士特汽车传动有限公司 一种双输入功率合流直接换档变速器及换档方法
US9517763B2 (en) 2014-11-18 2016-12-13 Saic Motor Corporation Limited Control systems and methods for transmission of hybrid power vehicle
US9545840B2 (en) 2014-11-18 2017-01-17 Saic Motor Corporation Limited Hybrid-power driving system for a vehicle and a transmission thereof
CN106382349A (zh) * 2016-12-07 2017-02-08 天津天海同步集团有限公司 一种无动力中断的双电机紧凑型变速箱
CN106427511A (zh) * 2016-10-30 2017-02-22 北京理工华创电动车技术有限公司 一种无动力中断amt电驱动结构
CN106499790A (zh) * 2016-12-26 2017-03-15 苏州绿控传动科技有限公司 一种同轴式双电机电驱动桥
CN106515512A (zh) * 2016-12-23 2017-03-22 南京越博动力***股份有限公司 一种基于纯电动汽车can总线控制双电机总成的***
US9623872B2 (en) 2015-05-29 2017-04-18 Saic Motor Corporation Limited Controlling apparatus and method for electric drive transmission of dual-motor electric vehicle
EP3159200A1 (de) * 2015-10-19 2017-04-26 Audi Ag Getriebeanordnung und verfahren zum betreiben eines kraftfahrzeugs
US9637115B2 (en) 2014-11-18 2017-05-02 Saic Motor Corporation Limited Control systems and methods for transmission of hybrid power vehicle
CN106907433A (zh) * 2017-04-26 2017-06-30 南京越博动力***股份有限公司 一种并联双输入轴变速器***及其换挡控制方法
US9744841B2 (en) 2014-11-18 2017-08-29 Saic Motor Corporation Limited Hybrid-power driving system for a vehicle and a transmission thereof
CN107234959A (zh) * 2016-03-29 2017-10-10 上海中科深江电动车辆有限公司 电驱动装置
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WO2017202031A1 (zh) * 2016-05-24 2017-11-30 南京越博动力***股份有限公司 一种双电机双轴输入变速箱的驱动***及其换档控制方法
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CN109823161A (zh) * 2019-03-26 2019-05-31 浙江工业职业技术学院 一种车用三电机混合动力变速驱动***及其控制方法
WO2019213792A1 (zh) * 2018-05-07 2019-11-14 南京越博动力***股份有限公司 一种纯电动汽车的双电机驱动桥箱
CN110566640A (zh) * 2019-09-20 2019-12-13 星易通航天科技(南京)有限公司 一种多档电驱变速箱
WO2020058107A3 (de) * 2018-09-19 2020-06-11 Zf Friedrichshafen Ag Antriebsvorrichtung zum elektrischen antrieb eines kraftfahrzeugs mit zwei elektrischen antriebsaggregaten und mit einer kühlvorrichtung für diese antriebsaggregate
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EP3587160A4 (en) * 2017-03-22 2020-12-30 Univance Corporation POWER TRANSFER DEVICE
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CN104015600A (zh) * 2014-06-12 2014-09-03 重庆大学 双电机纯电动汽车无离合器自动变速机构
US9789754B2 (en) 2014-11-14 2017-10-17 Saic Motor Corporation Limited Dual-motor power system and dual-motor hybrid power system for vehicle
US9637115B2 (en) 2014-11-18 2017-05-02 Saic Motor Corporation Limited Control systems and methods for transmission of hybrid power vehicle
US9517763B2 (en) 2014-11-18 2016-12-13 Saic Motor Corporation Limited Control systems and methods for transmission of hybrid power vehicle
US9545840B2 (en) 2014-11-18 2017-01-17 Saic Motor Corporation Limited Hybrid-power driving system for a vehicle and a transmission thereof
US9744841B2 (en) 2014-11-18 2017-08-29 Saic Motor Corporation Limited Hybrid-power driving system for a vehicle and a transmission thereof
US10144309B2 (en) 2015-05-29 2018-12-04 Saic Motor Corporation Limited Dual motor power system and control method for pure electric vehicle
US9623872B2 (en) 2015-05-29 2017-04-18 Saic Motor Corporation Limited Controlling apparatus and method for electric drive transmission of dual-motor electric vehicle
EP3159200A1 (de) * 2015-10-19 2017-04-26 Audi Ag Getriebeanordnung und verfahren zum betreiben eines kraftfahrzeugs
CN105508522A (zh) * 2016-02-02 2016-04-20 西安法士特汽车传动有限公司 一种双输入功率合流直接换档变速器及换档方法
CN107234959A (zh) * 2016-03-29 2017-10-10 上海中科深江电动车辆有限公司 电驱动装置
WO2017202031A1 (zh) * 2016-05-24 2017-11-30 南京越博动力***股份有限公司 一种双电机双轴输入变速箱的驱动***及其换档控制方法
CN106427511A (zh) * 2016-10-30 2017-02-22 北京理工华创电动车技术有限公司 一种无动力中断amt电驱动结构
CN106382349A (zh) * 2016-12-07 2017-02-08 天津天海同步集团有限公司 一种无动力中断的双电机紧凑型变速箱
CN106515512A (zh) * 2016-12-23 2017-03-22 南京越博动力***股份有限公司 一种基于纯电动汽车can总线控制双电机总成的***
CN106499790A (zh) * 2016-12-26 2017-03-15 苏州绿控传动科技有限公司 一种同轴式双电机电驱动桥
EP3587160A4 (en) * 2017-03-22 2020-12-30 Univance Corporation POWER TRANSFER DEVICE
US10968983B2 (en) 2017-03-22 2021-04-06 Univance Corporation Power transmission device
CN106907433A (zh) * 2017-04-26 2017-06-30 南京越博动力***股份有限公司 一种并联双输入轴变速器***及其换挡控制方法
EP3755559A4 (en) * 2018-02-19 2021-12-22 Allison Transmission, Inc. AXLE ARRANGEMENT FOR FRAME RAIL VEHICLES
EP3755558A4 (en) * 2018-02-19 2021-12-22 Allison Transmission, Inc. AXLE ARRANGEMENT FOR FRAME RAIL VEHICLES
US11318828B2 (en) 2018-02-19 2022-05-03 Allison Transmission, Inc. Axle assembly for frame rail vehicles
US11400755B2 (en) 2018-02-19 2022-08-02 Allison Transmission, Inc. Axle assembly for frame rail vehicles
EP4234298A3 (en) * 2018-02-19 2023-09-27 Allison Transmission, Inc. Axle assembly for frame rail vehicles
US11820216B2 (en) 2018-02-19 2023-11-21 Allison Transmission, Inc. Axle assembly for frame rail vehicles
US11820217B2 (en) 2018-02-19 2023-11-21 Allison Transmission, Inc. Axle assembly for frame rail vehicles
WO2019213792A1 (zh) * 2018-05-07 2019-11-14 南京越博动力***股份有限公司 一种纯电动汽车的双电机驱动桥箱
US10809301B2 (en) 2018-07-06 2020-10-20 D&V Electronics, Ltd. Belted transmission system for load motor system, having sprocket that receives belt coupled to load motor
WO2020058107A3 (de) * 2018-09-19 2020-06-11 Zf Friedrichshafen Ag Antriebsvorrichtung zum elektrischen antrieb eines kraftfahrzeugs mit zwei elektrischen antriebsaggregaten und mit einer kühlvorrichtung für diese antriebsaggregate
CN109823161A (zh) * 2019-03-26 2019-05-31 浙江工业职业技术学院 一种车用三电机混合动力变速驱动***及其控制方法
CN109823161B (zh) * 2019-03-26 2024-03-19 浙江工业职业技术学院 一种车用三电机混合动力变速驱动***及其控制方法
CN110566640A (zh) * 2019-09-20 2019-12-13 星易通航天科技(南京)有限公司 一种多档电驱变速箱

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