WO2022016678A1 - 一种基于两级行星排的同轴电驱动桥 - Google Patents

一种基于两级行星排的同轴电驱动桥 Download PDF

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Publication number
WO2022016678A1
WO2022016678A1 PCT/CN2020/113634 CN2020113634W WO2022016678A1 WO 2022016678 A1 WO2022016678 A1 WO 2022016678A1 CN 2020113634 W CN2020113634 W CN 2020113634W WO 2022016678 A1 WO2022016678 A1 WO 2022016678A1
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stage
planetary gear
reduction mechanism
gear
stage planetary
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PCT/CN2020/113634
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English (en)
French (fr)
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姚征
王铭东
刘鹏翔
张科勋
郝守刚
姜泽军
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清研华科新能源研究院(南京)有限公司
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Publication of WO2022016678A1 publication Critical patent/WO2022016678A1/zh

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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
    • 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

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  • the invention relates to the technical field of electric drive axles, in particular to a coaxial electric drive axle based on a two-stage planetary row.
  • the coaxial electric drive axle in the prior art uses a common planetary gear deceleration mechanism for deceleration. Since the speed that the ordinary planetary gear deceleration mechanism can achieve is relatively small, the output speed of the coaxial electric drive axle when working is relatively small.
  • the invention provides a coaxial electric drive axle based on a two-stage planetary row, which can obtain a larger speed ratio.
  • the specific technical solutions are as follows:
  • the present invention provides a coaxial electric drive axle based on a two-stage planetary row, including a drive motor, a first-stage planetary gear reduction mechanism, a two-stage planetary gear reduction mechanism, a differential, and a housing;
  • the drive motor, the first-stage planetary gear reduction mechanism, the second-stage planetary gear reduction mechanism and the differential are all installed in the housing;
  • the power output shaft of the drive motor is connected with the first-stage planetary gear reduction mechanism, the first-stage planetary gear reduction mechanism is connected with the second-stage planetary gear reduction mechanism, and the second-stage planetary gear reduction mechanism is connected with the differential gear.
  • the differential is connected to the wheels.
  • the first-stage planetary gear reduction mechanism includes a first-stage sun gear, a plurality of first-stage planetary gears, a first-stage planet carrier, and a first-stage ring gear
  • the second-stage planetary gear reduction mechanism includes a second-stage sun gear, multiple a secondary planetary gear, a secondary planet carrier and a secondary ring gear
  • each primary planetary gear is parallel to the axis of the primary sun gear
  • the axis of each secondary planetary gear is parallel to the axis of the secondary sun gear
  • the power output shaft of the drive motor is connected with the first-stage sun gear, the first-stage sun gear is externally meshed with the plurality of first-stage planetary gears, and the plurality of first-stage planetary gears are mounted on the first-stage planetary gears
  • the first-stage ring gear is fixedly mounted on the inner wall of the casing, the plurality of first-stage planetary gears mesh with the first-stage ring gear, and the first-stage planetary carrier is fixed with the second-stage sun gear connection, the secondary sun gear is externally meshed with the plurality of secondary planetary gears, the plurality of secondary planetary gears are mounted on the secondary planet carrier, and the secondary ring gear is fixedly mounted on the housing
  • the inner wall of the second-stage planetary gear is meshed with the second-stage ring gear, and the second-stage planet carrier is connected with the differential.
  • the first-stage planet carrier includes a plurality of first planetary gear shafts, the axis of each first planetary gear shaft is parallel to the axis of the first-stage sun gear, and the plurality of first-stage planetary gears pass through needle rollers.
  • Bearings are respectively mounted on the plurality of first planetary gear shafts, wherein the number of the first planetary gear shafts is the same as the number of the first-stage planetary gears.
  • the number of the first-stage planetary gears is three.
  • the secondary planet carrier includes a plurality of second planetary gear shafts, the axis of each second planetary gear shaft is parallel to the axis of the secondary sun gear, and the plurality of secondary planetary gears pass through needle rollers.
  • Bearings are respectively mounted on the plurality of second planetary gear shafts, wherein the number of the second planetary gear shafts is the same as the number of the secondary planetary gears.
  • the number of the secondary planetary gears is three.
  • the primary sun gear and the power output shaft are integrally formed.
  • the primary sun gear is spline-connected to the power output shaft.
  • the primary planet carrier and the secondary sun gear are fixedly connected by splines.
  • the primary planet carrier and the secondary sun gear are integrally formed.
  • the embodiment of the present invention provides a coaxial electric drive axle based on a two-stage planetary row, including a drive motor, a first-stage planetary gear reduction mechanism, a two-stage planetary gear reduction mechanism, a differential and a housing,
  • the drive motor, the primary planetary gear reduction mechanism, the secondary planetary gear reduction mechanism and the differential are all installed in the casing.
  • the power output shaft of the driving motor is connected with the primary planetary gear reduction mechanism, and the primary planetary gear reduction mechanism is connected with the secondary
  • the planetary gear reduction mechanism is connected, the secondary planetary gear reduction mechanism is connected with the differential, and the differential is connected with the wheels.
  • the deceleration is performed by a two-stage planetary gear deceleration mechanism formed by a first-stage planetary gear deceleration mechanism and a two-stage planetary gear deceleration mechanism in series, and the two-stage planetary gear deceleration mechanism is compared with the ordinary planetary gear deceleration mechanism. It has the advantage of being able to achieve a larger speed ratio. Therefore, the embodiment of the present invention provides a coaxial electric drive axle based on a two-stage planetary row, which can obtain a larger speed ratio. Of course, it is not necessary for any product or method of the present invention to achieve all of the advantages described above at the same time.
  • a coaxial electric drive axle based on a two-stage planetary row provided by the embodiment of the present invention is decelerated by a two-stage planetary gear reduction mechanism.
  • the two-stage planetary gear reduction mechanism has a
  • the embodiment of the present invention provides a coaxial electric drive axle based on a two-stage planetary row, which can obtain a larger speed ratio.
  • the coaxial electric drive axle based on the two-stage planetary row can obtain a larger speed ratio, compared with the ordinary planetary gear reduction mechanism, the range of the output speed ratio is expanded, so that the motor of the car can reach a higher torque and speed.
  • the range can be relatively small, so that the requirements for the motor are lower. Therefore, the car can use a lower standard motor to achieve the purpose of saving energy.
  • FIG. 1 is a schematic structural diagram of a coaxial electric drive axle based on a two-stage planetary row provided by an embodiment of the present invention. .
  • the embodiment of the present invention discloses a coaxial electric drive axle based on a two-stage planetary row, which can achieve a larger speed ratio.
  • the embodiments of the present invention will be described in detail below.
  • FIG. 1 is a schematic structural diagram of a coaxial electric drive axle based on a two-stage planetary row provided by an embodiment of the present invention.
  • the coaxial electric drive axle based on a two-stage planetary row provided by an embodiment of the present invention includes a drive motor 1 , a first-stage planetary gear reduction mechanism 2 , a second-stage planetary gear reduction mechanism 3 , a differential 4 , and a housing 5 , the drive motor 1 , the primary planetary gear reduction mechanism 2 , the secondary planetary gear reduction mechanism 3 and the differential 4 are all installed in the housing 5 .
  • the power output shaft of the drive motor 1 is connected with the primary planetary gear reduction mechanism 2, the primary planetary gear reduction mechanism 2 is connected with the secondary planetary gear reduction mechanism 3, the secondary planetary gear reduction mechanism 3 is connected with the differential 4, and the differential The device 4 is connected to the wheel.
  • the primary planetary gear reduction mechanism 2 includes a primary sun gear 21, a plurality of primary planetary gears 22, a primary planet carrier 23 and a primary ring gear 24, and the secondary planetary gear reduction mechanism 3 includes a secondary sun gear 31, A plurality of secondary planetary gears 32 , a secondary planet carrier 33 and a secondary ring gear 34 .
  • the primary sun gear 21 , the primary planet carrier 23 , the primary ring gear 24 , the secondary sun gear 31 , the secondary planet carrier 33 , the secondary ring gear 34 and the differential 4 are coaxial, each The axis of the primary planetary gears 22 is parallel to the axis of the primary sun gear 21 , and the axis of each secondary planetary gear 32 is parallel to the axis of the secondary sun gear 31 .
  • the primary sun gear 21 is rigidly connected to the power output shaft of the drive motor 1 as a power input end, that is, the power output shaft of the drive motor 1 is connected to the primary sun gear 21 .
  • the primary sun gear 21 is spline-connected to the power output shaft.
  • the primary sun gear 21 may be integrally formed with the power output shaft.
  • the first-stage sun gear 21 is externally meshed with a plurality of first-stage planetary gears 22, and the plurality of first-stage planetary gears 22 are mounted on the first-stage planetary carrier 23.
  • the first-stage planetary carrier 23 may include a plurality of first planetary gear shafts, each first The axis of the planetary gear shaft is parallel to the axis of the primary sun gear 21, and the plurality of primary planetary gears 22 are respectively installed on the plurality of first planetary gear shafts through needle bearings, wherein the number of the first planetary gear shafts is the same as that of the primary planetary gear shafts.
  • the number of gears 22 is the same.
  • the number of the first stage planetary gears 22 is three.
  • the primary ring gear 24 is fixedly mounted on the inner wall of the housing 5 , a plurality of primary planetary gears 22 are engaged with the primary ring gear 24 , and the primary planet carrier 23 serves as the power for the primary planetary gear reduction mechanism 2
  • the output end is fixedly connected with the secondary sun gear 31 .
  • the primary planet carrier 23 and the secondary sun gear 31 are fixedly connected by splines, or the primary planet carrier 23 and the secondary sun gear 31 are integrally formed.
  • the secondary sun gear 31 is externally meshed with a plurality of secondary planetary gears 32, and the plurality of secondary planetary gears 32 are mounted on the secondary planet carrier 33.
  • the secondary planet carrier 33 may include a plurality of second planetary gear shafts, each of which is a second planetary gear shaft.
  • the axis of the planetary gear shaft is parallel to the axis of the secondary sun gear 31, and the plurality of secondary planetary gears 32 are respectively mounted on the plurality of second planetary gear shafts through needle bearings, wherein the number of the second planetary gear shafts is the same as that of the secondary planetary gear shafts.
  • the number of gears 32 is the same.
  • the number of the secondary planetary gears 32 may be three.
  • the secondary ring gear 34 is fixedly mounted on the inner wall of the housing 5 , a plurality of secondary planetary gears 32 are engaged with the secondary ring gear 34 , and the secondary planetary carrier 33 is connected with.
  • the power is transmitted from the power output shaft of the drive motor 1 to the primary sun gear 21, and the rotation of the primary sun gear 21 drives the plurality of primary planetary gears 22 to revolve around the axis of the primary sun gear 21 and also rotate on its own. It is transmitted from the primary sun gear 21 to a plurality of primary planetary gears 22, and then transmitted to a primary planetary carrier 23 through a plurality of primary planetary gears 22.
  • the primary planetary carrier 23 serves as the power output end of the primary planetary gear reduction mechanism 2,
  • the power is transmitted to the secondary sun gear 31, and the rotation of the secondary sun gear 31 drives the plurality of secondary planetary gears 32 to revolve around the axis of the secondary sun gear 31 and also rotate, and the power is transmitted from the secondary sun gear 31 to the multiple secondary sun gears 31.
  • the planetary gear 32 is then transmitted to the secondary planetary carrier 33 through a plurality of secondary planetary gears 32. Due to the secondary planetary carrier 33 and the differential 4, the power is transmitted to the differential 4 through the secondary planetary carrier 33, and then It is transmitted to the wheels by the differential 4.
  • the primary planetary gear reduction mechanism 2 and the secondary planetary gear reduction mechanism 3 in the embodiment of the present invention are connected in series to form a two-stage planetary gear reduction mechanism, and the output power of the primary planetary gear reduction mechanism 2 directly passes through the secondary sun gear 31 Input to the secondary planetary gear reduction mechanism 3.
  • the embodiment of the present invention provides a coaxial electric drive axle based on a two-stage planetary row, including a drive motor 1 , a first-stage planetary gear reduction mechanism 2 , a second-stage planetary gear reduction mechanism 3 , and a differential 4 .
  • the housing 5, the drive motor 1, the primary planetary gear reduction mechanism 2, the secondary planetary gear reduction mechanism 3 and the differential 4 are all installed in the housing 5, and the power output shaft of the driving motor 1 and the primary planetary gear reduction
  • the mechanism 2 is connected, the primary planetary gear reduction mechanism 2 is connected with the secondary planetary gear reduction mechanism 3, the secondary planetary gear reduction mechanism 3 is connected with the differential 4, and the differential 4 is connected with the wheels.
  • the deceleration is performed by a two-stage planetary gear deceleration mechanism formed by connecting a first-stage planetary gear deceleration mechanism and a two-stage planetary gear deceleration mechanism, and the two-stage planetary gear deceleration mechanism is compared with the ordinary planetary gear deceleration mechanism. It has the advantage of being able to achieve a larger speed ratio. Therefore, the embodiment of the present invention provides a coaxial electric drive axle based on a two-stage planetary row, which can obtain a larger speed ratio.
  • the coaxial electric drive axle based on the two-stage planetary row can obtain a larger speed ratio, compared with the ordinary planetary gear reduction mechanism, the range of the output speed ratio is expanded, so that the motor of the car can reach a higher torque and speed.
  • the range can be relatively small, so that the requirements for the motor are lower. Therefore, the car can use a lower standard motor to achieve the purpose of saving energy.
  • modules in the apparatus in the embodiment may be distributed in the apparatus in the embodiment according to the description of the embodiment, and may also be located in one or more apparatuses different from this embodiment with corresponding changes.
  • the modules in the foregoing embodiments may be combined into one module, or may be further split into multiple sub-modules.

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Abstract

一种基于两级行星排的同轴电驱动桥，包括驱动电机(1)、一级行星齿轮减速机构(2)、二级行星齿轮减速机构(3)、差速器(4)和壳体(5)，驱动电机(1)、一级行星齿轮减速机构(2)、二级行星齿轮减速机构(3)和差速器(4)均安装于壳体(5)内，驱动电机(1)的动力输出轴与一级行星齿轮减速机构(2)连接，一级行星齿轮减速机构(2)与二级行星齿轮减速机构(3)连接，二级行星齿轮减速机构(3)与差速器(4)连接，差速器(4)与车轮连接。由于通过一级行星齿轮减速机构(2)和二级行星齿轮减速机构(3)串联形成的两级行星齿轮减速机构进行减速，且两级行星齿轮减速机构相比普通行星齿轮减速机构具有能够达到较大速比的优点，因此，基于两级行星排的同轴电驱动桥能够得到较大速比。

Description

一种基于两级行星排的同轴电驱动桥 技术领域
本发明涉及电驱动桥技术领域，具体而言，涉及一种基于两级行星排的同轴电驱动桥。
背景技术
目前，越来越多的车辆使用同轴电驱动桥来实现车轮的纯电驱动。
现有技术中的同轴电驱动桥采用普通行星齿轮减速机构进行减速，由于普通行星齿轮减速机构所能达到的速比较小，使得同轴电驱动桥工作时，所输出的速比较小。
而对于不同路况来说，需要同轴式电驱动桥可以输出较大的速比，因此，目前亟需一种能达到较大速比的同轴电驱动桥。
发明内容
本发明提供了一种基于两级行星排的同轴电驱动桥，能够得到较大速比。具体的技术方案如下：
第一方面，本发明提供了一种基于两级行星排的同轴电驱动桥，包括驱动电机、一级行星齿轮减速机构、二级行星齿轮减速机构、差速器和壳体；
所述驱动电机、所述一级行星齿轮减速机构、所述二级行星齿轮减速机构和所述差速器均安装于所述壳体内；
所述驱动电机的动力输出轴与所述一级行星齿轮减速机构连接，所述一级行星齿轮减速机构与所述二级行星齿轮减速机构连接，所述二级行星齿轮减速机构与所述差速器连接，所述差速器与车轮连接。
可选的，所述一级行星齿轮减速机构包括一级太阳轮、多个一级行星齿轮、一级行星架和一级齿圈，所述二级行星齿轮减速机构包括二级太阳轮、多个二级行星齿轮、二级行星架和二级齿圈；
所述一级太阳轮、所述一级行星架、所述一级齿圈、所述二级太阳轮、所述二级行星架、所述二级齿圈和所述差速器同轴，每个一级行星齿轮的轴线与所述一级太阳轮的轴线平行，每个二级行星齿轮的轴线与所述二级太阳轮的轴线平行；
所述驱动电机的动力输出轴与所述一级太阳轮连接，所述一级太阳轮与所述多个一级行星齿轮外啮合，所述多个一级行星齿轮安装于所述一级行星架，所述一级齿圈固定安装于所述壳体的内壁，所述多个一级行星齿轮与所述一级齿圈内啮合，所述一级行星架与所述二级太阳轮固定连接，所述二级太阳轮与所述多个二级行星齿轮外啮合，所述多个二级行星齿轮安装于所述二级行星架，所述二级齿圈固定安装于所述壳体的内壁，所述多个二级行星齿轮与所述二级齿圈内啮合，所述二级行星架与所述差速器连接。
可选的，所述一级行星架包括多个第一行星齿轮轴，每个第一行星齿轮轴的轴线与所述一级太阳轮的轴线平行，所述多个一级行星齿轮通过滚针轴承分别安装于所述多个第一行星齿轮轴，其中，所述第一行星齿轮轴的数量与所述一级行星齿轮的数量相同。
可选的，所述一级行星齿轮的数量为三个。
可选的，所述二级行星架包括多个第二行星齿轮轴，每个第二行星齿轮轴的轴线与所述二级太阳轮的轴线平行，所述多个二级行星齿轮通过滚针轴承分别安装于所述多个第二行星齿轮轴，其中，所述第二行星齿轮轴的数量与所述二级行星齿轮的数量相同。
可选的，所述二级行星齿轮的数量为三个。
可选的，所述一级太阳轮与所述动力输出轴一体成型。
可选的，所述一级太阳轮与所述动力输出轴花键连接。
可选的，所述一级行星架与所述二级太阳轮通过花键固定连接。
可选的，所述一级行星架与所述二级太阳轮一体成型。
由上述内容可知，本发明实施例提供的一种基于两级行星排的同轴电驱动桥，包括驱动电机、一级行星齿轮减速机构、二级行星齿轮减速机构、差速器和壳体，驱动电机、一级行星齿轮减速机构、二级行星齿轮减速机构和差速器均安装于壳体内，驱动电机的动力输出轴与一级行星齿轮减速机构连 接，一级行星齿轮减速机构与二级行星齿轮减速机构连接，二级行星齿轮减速机构与差速器连接，差速器与车轮连接。由于本发明实施例中是通过一级行星齿轮减速机构和二级行星齿轮减速机构串联所形成的两级行星齿轮减速机构进行减速的，且两级行星齿轮减速机构相比于普通行星齿轮减速机构具有能够达到较大速比的优点，因此，本发明实施例提供的一种基于两级行星排的同轴电驱动桥，能够得到较大速比。当然，实施本发明的任一产品或方法并不一定需要同时达到以上所述的所有优点。
本发明实施例的创新点包括：
1、本发明实施例提供的一种基于两级行星排的同轴电驱动桥是通过两级行星齿轮减速机构进行减速的，由于两级行星齿轮减速机构相比于普通行星齿轮减速机构具有能够达到较大速比的优点，因此，本发明实施例提供的一种基于两级行星排的同轴电驱动桥，能够得到较大速比。
2、由于基于两级行星排的同轴电驱动桥能够得到较大速比，相比于普通行星齿轮减速机构，扩大了输出的速比的范围，使得汽车的电机可达到的扭矩和转速的范围可以相对小一些，使得对于电机的要求较低，因此，汽车使用较低标准的电机即可，达到节省能源的目的。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍。显而易见地，下面描述中的附图仅仅是本发明的一些实施例。对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的基于两级行星排的同轴电驱动桥的一种结构示意图。。
图1中，1驱动电机、2一级行星齿轮减速机构、21一级太阳轮、22一级行星齿轮、23一级行星架、24一级齿圈、3二级行星齿轮减速机构、31二级太阳轮、32二级行星齿轮、33二级行星架、34二级齿圈、4差速器、5壳体。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整的描述。显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有付出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明的是，本发明实施例及附图中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。例如包含的一系列步骤或单元的过程、方法、***、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其他步骤或单元。
本发明实施例公开了一种基于两级行星排的同轴电驱动桥，能够达到较大速比。下面对本发明实施例进行详细说明。
图1为本发明实施例提供的基于两级行星排的同轴电驱动桥的一种结构示意图。参见图1，本发明实施例提供的基于两级行星排的同轴电驱动桥包括驱动电机1、一级行星齿轮减速机构2、二级行星齿轮减速机构3、差速器4和壳体5，驱动电机1、一级行星齿轮减速机构2、二级行星齿轮减速机构3和差速器4均安装于壳体5内。
驱动电机1的动力输出轴与一级行星齿轮减速机构2连接，一级行星齿轮减速机构2与二级行星齿轮减速机构3连接，二级行星齿轮减速机构3与差速器4连接，差速器4与车轮连接。
其中，一级行星齿轮减速机构2包括一级太阳轮21、多个一级行星齿轮22、一级行星架23和一级齿圈24，二级行星齿轮减速机构3包括二级太阳轮31、多个二级行星齿轮32、二级行星架33和二级齿圈34。
继续参见图1，一级太阳轮21、一级行星架23、一级齿圈24、二级太阳轮31、二级行星架33、二级齿圈34和差速器4同轴，每个一级行星齿轮22的轴线与一级太阳轮21的轴线平行，每个二级行星齿轮32的轴线与二级太阳轮31的轴线平行。
一级太阳轮21作为动力输入端与驱动电机1的动力输出轴刚性连接，即驱动电机1的动力输出轴与一级太阳轮21连接。
其中，动力输出轴与一级太阳轮21刚性连接的方式有多种，包括但不限于以下两种：
第一种：
一级太阳轮21与动力输出轴花键连接。
第二种：
一级太阳轮21可以与动力输出轴一体成型。
一级太阳轮21与多个一级行星齿轮22外啮合，多个一级行星齿轮22安装于一级行星架23，一级行星架23可以包括多个第一行星齿轮轴，每个第一行星齿轮轴的轴线与一级太阳轮21的轴线平行，多个一级行星齿轮22通过滚针轴承分别安装于多个第一行星齿轮轴，其中，第一行星齿轮轴的数量与一级行星齿轮22的数量相同。
示例性的，一级行星齿轮22的数量为三个。
继续参见图1，一级齿圈24固定安装于壳体5的内壁，多个一级行星齿轮22与一级齿圈24内啮合，一级行星架23作为一级行星齿轮减速机构2的动力输出端与二级太阳轮31固定连接，示例性的，一级行星架23与二级太阳轮31通过花键固定连接，或者，一级行星架23与二级太阳轮31一体成型。
二级太阳轮31与多个二级行星齿轮32外啮合，多个二级行星齿轮32安装于二级行星架33，二级行星架33可以包括多个第二行星齿轮轴，每个第二行星齿轮轴的轴线与二级太阳轮31的轴线平行，多个二级行星齿轮32通过滚针轴承分别安装于多个第二行星齿轮轴，其中，第二行星齿轮轴的数量与二级行星齿轮32的数量相同。
示例性的，二级行星齿轮32的数量可以为三个。
继续参见图1，二级齿圈34固定安装于壳体5的内壁，多个二级行星齿轮32与二级齿圈34内啮合，二级行星架33与连接。
在工作时，动力由驱动电机1的动力输出轴传至一级太阳轮21，一级太阳轮21转动带动多个一级行星齿轮22既绕一级太阳轮21的轴线公转而且还自转，动力由一级太阳轮21传至多个一级行星齿轮22，再通过多个一级行星齿轮22传至一级行星架23，一级行星架23作为一级行星齿轮减速机构2的动力输出端，将动力传至二级太阳轮31，二级太阳轮31转动带动多个二 级行星齿轮32既绕二级太阳轮31的轴线公转而且还自转，动力由二级太阳轮31传至多个二级行星齿轮32，再通过多个二级行星齿轮32传至二级行星架33，由于二级行星架33与差速器4，因此，动力经由二级行星架33传至差速器4，再由差速器4传至车轮。
可见，本发明实施例中的一级行星齿轮减速机构2和二级行星齿轮减速机构3串联形成一个两级行星齿轮减速机构，一级行星齿轮减速机构2输出的动力直接通过二级太阳轮31输入至二级行星齿轮减速机构3。
由上述内容可知，本发明实施例提供的一种基于两级行星排的同轴电驱动桥，包括驱动电机1、一级行星齿轮减速机构2、二级行星齿轮减速机构3、差速器4和壳体5，驱动电机1、一级行星齿轮减速机构2、二级行星齿轮减速机构3和差速器4均安装于壳体5内，驱动电机1的动力输出轴与一级行星齿轮减速机构2连接，一级行星齿轮减速机构2与二级行星齿轮减速机构3连接，二级行星齿轮减速机构3与差速器4连接，差速器4与车轮连接。由于本发明实施例中是通过一级行星齿轮减速机构和二级行星齿轮减速机构串联所形成的两级行星齿轮减速机构进行减速的，且两级行星齿轮减速机构相比于普通行星齿轮减速机构具有能够达到较大速比的优点，因此，本发明实施例提供的一种基于两级行星排的同轴电驱动桥，能够得到较大速比。
同时，由于基于两级行星排的同轴电驱动桥能够得到较大速比，相比于普通行星齿轮减速机构，扩大了输出的速比的范围，使得汽车的电机可达到的扭矩和转速的范围可以相对小一些，使得对于电机的要求较低，因此，汽车使用较低标准的电机即可，达到节省能源的目的。
本领域普通技术人员可以理解：附图只是一个实施例的示意图，附图中的模块或流程并不一定是实施本发明所必须的。
本领域普通技术人员可以理解：实施例中的装置中的模块可以按照实施例描述分布于实施例的装置中，也可以进行相应变化位于不同于本实施例的一个或多个装置中。上述实施例的模块可以合并为一个模块，也可以进一步拆分成多个子模块。
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述实施例所记载的技术方案进行修改，或者 对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明实施例技术方案的精神和范围。

Claims (10)

  1. 一种基于两级行星排的同轴电驱动桥，其特征在于，包括驱动电机、一级行星齿轮减速机构、二级行星齿轮减速机构、差速器和壳体；
    所述驱动电机、所述一级行星齿轮减速机构、所述二级行星齿轮减速机构和所述差速器均安装于所述壳体内；
    所述驱动电机的动力输出轴与所述一级行星齿轮减速机构连接，所述一级行星齿轮减速机构与所述二级行星齿轮减速机构连接，所述二级行星齿轮减速机构与所述差速器连接，所述差速器与车轮连接。
  2. 如权利要求1所述的同轴电驱动桥，其特征在于，所述一级行星齿轮减速机构包括一级太阳轮、多个一级行星齿轮、一级行星架和一级齿圈，所述二级行星齿轮减速机构包括二级太阳轮、多个二级行星齿轮、二级行星架和二级齿圈；
    所述一级太阳轮、所述一级行星架、所述一级齿圈、所述二级太阳轮、所述二级行星架、所述二级齿圈和所述差速器同轴，每个一级行星齿轮的轴线与所述一级太阳轮的轴线平行，每个二级行星齿轮的轴线与所述二级太阳轮的轴线平行；
    所述驱动电机的动力输出轴与所述一级太阳轮连接，所述一级太阳轮与所述多个一级行星齿轮外啮合，所述多个一级行星齿轮安装于所述一级行星架，所述一级齿圈固定安装于所述壳体的内壁，所述多个一级行星齿轮与所述一级齿圈内啮合，所述一级行星架与所述二级太阳轮固定连接，所述二级太阳轮与所述多个二级行星齿轮外啮合，所述多个二级行星齿轮安装于所述二级行星架，所述二级齿圈固定安装于所述壳体的内壁，所述多个二级行星齿轮与所述二级齿圈内啮合，所述二级行星架与所述差速器连接。
  3. 如权利要求2所述的同轴电驱动桥，其特征在于，所述一级行星架包括多个第一行星齿轮轴，每个第一行星齿轮轴的轴线与所述一级太阳轮的轴线平行，所述多个一级行星齿轮通过滚针轴承分别安装于所述多个第一行星齿轮轴，其中，所述第一行星齿轮轴的数量与所述一级行星齿轮的数量相同。
  4. 如权利要求3所述的同轴电驱动桥，其特征在于，所述一级行星齿轮的数量为三个。
  5. 如权利要求2所述的同轴电驱动桥，其特征在于，所述二级行星架包括多个第二行星齿轮轴，每个第二行星齿轮轴的轴线与所述二级太阳轮的轴线平行，所述多个二级行星齿轮通过滚针轴承分别安装于所述多个第二行星齿轮轴，其中，所述第二行星齿轮轴的数量与所述二级行星齿轮的数量相同。
  6. 如权利要求5所述的同轴电驱动桥，其特征在于，所述二级行星齿轮的数量为三个。
  7. 如权利要求2所述的同轴电驱动桥，其特征在于，所述一级太阳轮与所述动力输出轴一体成型。
  8. 如权利要求2所述的同轴电驱动桥，其特征在于，所述一级太阳轮与所述动力输出轴花键连接。
  9. 如权利要求2所述的同轴电驱动桥，其特征在于，所述一级行星架与所述二级太阳轮通过花键固定连接。
  10. 如权利要求2所述的同轴电驱动桥，其特征在于，所述一级行星架与所述二级太阳轮一体成型。
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