CN111483271A - Electric axle for a motor vehicle - Google Patents
Electric axle for a motor vehicle Download PDFInfo
- Publication number
- CN111483271A CN111483271A CN201910078879.4A CN201910078879A CN111483271A CN 111483271 A CN111483271 A CN 111483271A CN 201910078879 A CN201910078879 A CN 201910078879A CN 111483271 A CN111483271 A CN 111483271A
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- CN
- China
- Prior art keywords
- planetary
- sun gear
- electric axle
- gear
- motor
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 51
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 41
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
- B60B35/12—Torque-transmitting axles
- B60B35/121—Power-transmission from drive shaft to hub
- B60B35/122—Power-transmission from drive shaft to hub using gearings
- B60B35/125—Power-transmission from drive shaft to hub using gearings of the planetary type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
- B60B35/12—Torque-transmitting axles
- B60B35/16—Axle housings
Abstract
The invention relates to an electric axle for a motor vehicle, comprising: a speed reducer including an input shaft and configured to receive a driving torque from the input shaft and to output the driving torque to wheels after being increased; the speed reducer comprises a first planetary transmission device and a second planetary transmission device, the first planetary transmission device comprises a first sun gear, a first planetary gear and a first planetary carrier, the second planetary transmission device comprises a second sun gear, a second planetary gear and a second planetary carrier, the first planetary carrier and the second sun gear are in transmission connection, so that the first planetary transmission device and the second planetary transmission device are in transmission connection, and the second planetary carrier and a hub of a wheel are in transmission connection; wherein the drive torque is input from the input shaft to the first sun gear, transmitted to the second sun gear via the first planetary gear and the first carrier in order, and output to the wheels via the second planetary gear and the second carrier.
Description
Technical Field
The present invention relates to the field of motor vehicles, and more particularly to an electric axle for a motor vehicle.
Background
In a pure electric vehicle or a hybrid vehicle using an electric motor, an electric axle is used which includes an electric motor, a reduction gear, and a differential. Typically, the reducer includes therein a gear transmission and an input shaft for connection with an output shaft of the motor to receive the drive torque, the gear transmission being arranged in driving connection with and receiving the drive torque from the input shaft. The arrangement space of the electric axle on the motor vehicle is small, so that a large speed ratio is difficult to realize, the electric axle with the large speed ratio can reduce the required torque of the motor, the cost of the motor is effectively reduced, the cost of the electric axle assembly is further reduced, and if the large speed ratio needs to be realized, the space occupied by the electric axle is too large.
Therefore, an electric axle with good driving performance, reasonable layout, compact structure, large speed ratio and small volume is needed.
Disclosure of Invention
The invention aims to provide an electric axle with good driving performance, reasonable layout, compact structure, large speed ratio and small volume.
The invention provides an electric axle for a motor vehicle, comprising:
A speed reducer including an input shaft and configured to receive a driving torque from the input shaft and to output the driving torque to wheels after being increased;
The speed reducer comprises a first planetary transmission device and a second planetary transmission device, the first planetary transmission device comprises a first sun gear, a first planetary gear and a first planetary carrier, the second planetary transmission device comprises a second sun gear, a second planetary gear and a second planetary carrier, the first planetary carrier and the second sun gear are in transmission connection, so that the first planetary transmission device and the second planetary transmission device are in transmission connection, and the second planetary carrier and a hub of a wheel are in transmission connection;
Wherein the drive torque is input from the input shaft to the first sun gear, transmitted to the second sun gear via the first planetary gear and the first carrier in order, and output to the wheels via the second planetary gear and the second carrier.
According to an embodiment of the invention, the second transmission is at least partly arranged in the hub of the wheel.
According to an embodiment of the invention, the electric axle comprises a housing, on which the first ring gear of the first planetary gear and the second ring gear of the second planetary gear are fixed.
According to an embodiment of the invention, the first sun gear of the first planetary transmission is configured to be integrally formed with the input shaft.
According to an embodiment of the invention, the second planet carrier of the second planetary transmission is configured to be integrally formed with a hub of a wheel.
According to an embodiment of the invention, the second sun gear of the second planetary transmission is fitted on a second sun gear shaft, the first planet carrier of the first planetary transmission being configured for splined connection with the second sun gear shaft.
According to an embodiment of the invention, the electric axle comprises two of said speed reducers and a first and a second electric motor drivingly connected to one of said speed reducers, respectively, said first and second electric motors sharing a motor housing, and said motor housing being configured for bolted connection to the speed reducer housing.
According to an embodiment of the present invention, the electric axle includes two speed reducers and a first motor and a second motor respectively drivingly connected to one of the speed reducers, the first motor and the speed reducer drivingly connected thereto share a first housing, the second motor and the speed reducer drivingly connected thereto share a second housing, and the first housing and the second housing are configured to be bolted.
The electric axle for the motor vehicle has the advantages of good driving performance, reasonable layout, compact structure, large speed ratio and small volume.
Drawings
Fig. 1 shows a schematic view of an electric axle for a motor vehicle according to an embodiment of the invention.
Fig. 2 shows a schematic view of an electric axle for a motor vehicle according to a further embodiment of the invention.
Detailed Description
Embodiments of an electric axle for a motor vehicle according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and drawings are included to illustrate the principles of the invention, which is not to be limited to the preferred embodiments described, but is to be defined by the appended claims.
Fig. 1 shows a schematic view of an electric axle for a motor vehicle according to an embodiment of the invention. An electric axle according to an embodiment of the present invention is described below with reference to fig. 1.
As shown in fig. 1, an electric axle 100 for a motor vehicle according to the present invention includes an electric motor 110 and a speed reducer. As can be seen from fig. 1, the electric axle 100 includes two motors 110 and two speed reducers, the motor 110 and the speed reducer on the left side in fig. 1 are used for outputting a driving torque to the wheel 140 on the left side in fig. 1 to drive the wheel 140 on the left side to rotate, and the motor and the speed reducer on the right side in fig. 1 are used for outputting a driving torque to the wheel on the right side in fig. 1 to drive the wheel on the right side to rotate, so that those skilled in the art can understand that the electric axle according to the present invention omits a differential in the electric axle and instead outputs driving torques to the two wheels in an independent driving manner using the two motors and the two speed reduce. The left and right motors and reducers of fig. 1 are substantially identical in structure and the left motor and reducer of fig. 1 will be described in detail below, but those skilled in the art will understand that the following description of the left motor and reducer of fig. 1 applies equally to the right motor and reducer of fig. 1 and will thus understand the application of the electric axle for a motor vehicle according to the present invention. Further, it can be understood by those skilled in the art that fig. 1 shows a case where the motorized axle for a motor vehicle according to the present invention drives two wheels of the motor vehicle, but the electric axle for a motor vehicle according to the present invention is not limited to the above example, and for example, the electric axle for a motor vehicle according to the present invention may also drive four wheels or more.
The above components are described in detail below.
As shown in fig. 1, the motor 110 is drivingly connected to the reducer for providing a drive torque to the reducer through the motor output shaft.
As shown in fig. 1, the speed reducer includes an input shaft and is configured to receive a driving torque from the input shaft and to increase the driving torque to be output to wheels. The speed reducer comprises a first planetary gear 120 and a second planetary gear 130, the second planetary gear 130 being at least partially arranged in the hub of a wheel 140, the first planetary gear 120 being arranged between the electric motor 110 and the second planetary gear 130. The first planetary gear set 120 comprises a first sun gear 1201, a first planet gear 1202 and a first planet carrier 1203, the second planetary gear set 130 comprises a second sun gear 1301, a second planet gear 1302 and a second planet carrier 1303, the first planet carrier 1203 and the second sun gear 1301 are in driving connection, so that the first planetary gear set 120 and the second planetary gear set 130 are in driving connection, and the second planet carrier 1303 and the hub of the wheel 140 are in driving connection. As can be understood by those skilled in the art, in the electric axle 100 according to the embodiment of the present invention, when the driving torque is input from the input shaft to the first planetary gear 120, the first sun gear 1201 receives the input torque as an input end of the first planetary gear 120 to rotate, thereby transmitting the driving torque to the first planetary gear 1202 engaged with the first sun gear 1201; thereafter, as the first sun gear 1201 rotates, the first planetary gear 1202 is driven to rotate by the first sun gear 1201 engaged therewith and rotates around the first sun gear 1201; also, the first carrier 1203 rotates around the first sun gear 1201 together with the first planetary gear 1202, so that the first carrier 1203 outputs a driving torque as an output end of the first planetary gear 120. Thereafter, the second sun gear 1301, as an input end of the second planetary gear set 130, receives a driving torque from the first planet carrier 1203 to rotate, thereby transmitting the driving torque to the second planet gears 1302 engaged with the second sun gear 1301; thereafter, as the second sun gear 1301 rotates, the second planetary gears 1302 are driven to self-transmit by the second sun gear 1301 in mesh therewith and rotate around the second sun gear 1301; also, the second planet carrier 1303 rotates around the second sun gear 1301 together with the second planetary gears 1302, so that the second planet carrier 1303 as an output of the second planetary gear device 130 outputs the driving torque to the wheels 140. Therefore, the drive torque is input from the input shaft to the first sun gear 1201, transmitted to the second sun gear 1301 via the first planetary gears 1202 and the first carrier 1203 in order, and output to the wheels 140 via the second planetary gears 1302 and the second carrier 1303.
The electric axle for a motor vehicle according to the invention also comprises a housing. In one embodiment according to the present invention, as shown in fig. 1, the housing includes a motor housing and a reducer housing, the electric axle 100 includes a left reducer, a left motor 140 drivingly connected to the left reducer, a right reducer, and a right motor drivingly connected to the right reducer, the left motor and the right motor sharing a motor housing, and the motor housing is configured to be bolted to the reducer housing. In another embodiment according to the present invention, as shown in fig. 2, the electric axle 100 includes a left reduction gear, a left motor 140 drivingly connected to the left reduction gear, a right reduction gear, and a right motor drivingly connected to the right reduction gear, the left motor and the left reduction gear drivingly connected thereto share a first housing, the right motor and the right reduction gear drivingly connected thereto share a second housing, and the two housings are configured to be bolted. Those skilled in the art will appreciate that the housing arrangement of the electric axle for a motor vehicle according to the present invention described above with reference to fig. 1 and 2 is only an example, and the housing of the electric axle for a motor vehicle according to the present invention is not limited to the above example, and those skilled in the art may make different housing arrangements depending on actual conditions and requirements.
The following describes a transmission process of the driving torque of the electric axle 100 according to the embodiment of the present invention.
A driving torque is input from the input shaft to the first sun gear 1201 of the first planetary gear set to rotate the first sun gear 1201 about the input shaft. Then, the first sun gear 1201 rotating around the input shaft drives the first planetary gear 1202 to rotate by the meshing force between the gears, thereby transmitting the driving torque to the first planetary gear 1202 meshing therewith. The first carrier 1203 rotates together with the first planetary gears 1202 around the first sun gear 1201, and thereby transmits the driving torque to the second sun gear 1301 of the second planetary gear 130 drivingly connected to the first carrier 1203, so that the transmission of the driving torque is completed with the first sun gear 1201 as an input end and the first carrier 1203 as an output end in the first planetary gear 120. Thereafter, similarly to the transmission process of the driving torque of the first planetary gear 120, the transmission of the driving torque with the second sun gear 1301 as an input end and the second carrier 1303 as an output end is completed in the second planetary gear 130, thereby outputting the driving torque to the wheels.
In the electric axle for a motor vehicle according to the present invention, the differential gear in the electric axle is omitted, and instead, a separate motor and speed reducer are provided for each wheel, in other words, the electric axle for a motor vehicle according to the present invention outputs driving torque to each wheel in an independent driving manner, so the electric axle for a motor vehicle according to the present invention has advantages of reasonable layout and good driving performance. Moreover, because the planetary transmission device has the characteristics of small volume and large speed ratio, the driving torque amplification function of the speed reducer can be improved, and the radial size of the gear in the connecting transmission device can be reduced, so that the radial size of the electric axle is reduced. Therefore, the electric axle for the motor vehicle has the advantage of compact structure.
Therefore, the electric axle for the motor vehicle has the advantages of good driving performance, reasonable layout, compact structure, large speed ratio and small volume.
The following embodiments are preferred embodiments of the electric axle for a motor vehicle according to the present invention, but it will be understood by those skilled in the art that the following preferred embodiments are only examples, and the electric axle for a motor vehicle according to the present invention is not limited to these examples, but may be variously designed according to actual conditions and requirements.
According to an embodiment of the invention, the first ring gear of the first planetary gear and the second ring gear of the second planetary gear are fixed to the housing.
According to an embodiment of the invention, the first sun gear of the first planetary transmission is configured to be integrally formed with the input shaft. However, it can be understood by those skilled in the art that the electric transaxle for a motor vehicle according to the present invention is not limited thereto, and for example, the first sun gear of the first planetary gear may also be welded or splined with the input shaft.
According to an embodiment of the invention, the second planet carrier of the second planetary transmission is configured to be integrally formed with a hub of a wheel. However, it will be understood by those skilled in the art that the electric transaxle for a motor vehicle according to the present invention is not limited thereto, and for example, the second carrier of the second planetary gear may be welded to the hub of the wheel.
According to an embodiment of the invention, the second sun gear of the second planetary transmission is fitted on a second sun gear shaft, the first planet carrier of the first planetary transmission being configured for splined connection with the second sun gear shaft. However, it can be understood by those skilled in the art that the electric transaxle for a motor vehicle according to the present invention is not limited thereto, and for example, the second sun gear of the second planetary gear may be further integrally formed or welded with the second sun gear shaft, and the first carrier of the first planetary gear may be further integrally formed or welded with the second sun gear shaft.
As described above, although the exemplary embodiments of the present invention have been described in the description with reference to the drawings, the present invention is not limited to the above-described embodiments, and the scope of the present invention should be defined by the claims and their equivalents.
Claims (8)
1. An electric axle (100) for a motor vehicle, characterized in that it comprises:
A speed reducer including an input shaft and configured to receive a driving torque from the input shaft and to increase the driving torque to be output to wheels (140);
The speed reducer comprises a first planetary transmission device (120) and a second planetary transmission device (130), wherein the first planetary transmission device (120) comprises a first sun gear (1201), a first planetary gear (1202) and a first planet carrier (1203), the second planetary transmission device (130) comprises a second sun gear (1301), a second planetary gear (1302) and a second planet carrier (1303), the first planet carrier (1203) and the second sun gear (1301) are in transmission connection, so that the first planetary transmission device (120) is in transmission connection with the second planetary transmission device (130), and the second planet carrier (1303) is in transmission connection with a hub of a wheel (140);
Wherein drive torque is input from the input shaft to the first sun gear (1201), transmitted to the second sun gear (1301) via the first planet gears (1202) and the first carrier (1203) in sequence, and output to wheels (140) via the second planet gears (1302) and the second carrier (1303).
2. Electric axle (100) according to claim 1, wherein the second transmission (130) is at least partially arranged in a hub of a wheel (140).
3. The electric axle (100) according to claim 2, wherein the electric axle (100) comprises a housing to which the first ring gear of the first planetary transmission (120) and the second ring gear of the second planetary transmission (130) are fixed.
4. The electric axle (100) of claim 3, wherein the first sun gear (1201) of the first planetary transmission (120) is configured to be integrally formed with the input shaft.
5. The electric axle (100) according to claim 4, wherein the second planet carrier (1303) of the second planetary transmission (130) is configured to be integrally formed with a hub of a wheel (140).
6. The electric axle (100) according to claim 5, wherein the second sun gear (1301) of the second planetary transmission (130) is fitted on a second sun gear shaft, the first planet carrier (1203) of the first planetary transmission (120) being configured to be splined with the second sun gear shaft.
7. The electric axle (100) of claim 6, wherein the electric axle (100) includes two of the speed reducers and first and second motors drivingly connected to one of the speed reducers, respectively, the first and second motors sharing a motor housing, and the motor housing being configured to be bolted to the speed reducer housing.
8. The electric axle (100) of claim 6, wherein the electric axle (100) comprises two speed reducers and a first motor and a second motor each drivingly connected to one of the speed reducers, the first motor and the speed reducer drivingly connected thereto share a first housing, the second motor and the speed reducer drivingly connected thereto share a second housing, and the first housing and the second housing are configured to be bolted together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910078879.4A CN111483271A (en) | 2019-01-28 | 2019-01-28 | Electric axle for a motor vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910078879.4A CN111483271A (en) | 2019-01-28 | 2019-01-28 | Electric axle for a motor vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111483271A true CN111483271A (en) | 2020-08-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910078879.4A Pending CN111483271A (en) | 2019-01-28 | 2019-01-28 | Electric axle for a motor vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111483271A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113858930A (en) * | 2021-10-28 | 2021-12-31 | 中国第一汽车股份有限公司 | Coaxial double-motor drive assembly and vehicle |
| WO2024032723A1 (en) * | 2022-08-10 | 2024-02-15 | 上海盘毂动力科技股份有限公司 | Electric drive system and design method therefor |
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| CN202294235U (en) * | 2011-10-24 | 2012-07-04 | 郑州宇通客车股份有限公司 | Driving system of series-parallel hybrid system |
| CN203186075U (en) * | 2012-12-26 | 2013-09-11 | 北京智行鸿远汽车技术有限公司 | Wheel motor drive axle for electric vehicle |
| CN103448537A (en) * | 2013-08-15 | 2013-12-18 | 安徽工程大学 | Motor-driven hub reduction system |
| CN104245379A (en) * | 2012-02-02 | 2014-12-24 | 舍弗勒技术有限两合公司 | Electrical power train for the steerable axle of a motor vehicle |
| DE102013223402A1 (en) * | 2013-11-15 | 2015-05-21 | Mtu Friedrichshafen Gmbh | Electro-mechanical hybrid drive and vehicle |
| CN105480069A (en) * | 2015-12-30 | 2016-04-13 | 北京新能源汽车股份有限公司 | Power system and vehicle with same |
| CN208232793U (en) * | 2018-02-23 | 2018-12-14 | 蔚来汽车有限公司 | Electric car and its bi-motor planetary gear power drive system |
-
2019
- 2019-01-28 CN CN201910078879.4A patent/CN111483271A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202294235U (en) * | 2011-10-24 | 2012-07-04 | 郑州宇通客车股份有限公司 | Driving system of series-parallel hybrid system |
| CN104245379A (en) * | 2012-02-02 | 2014-12-24 | 舍弗勒技术有限两合公司 | Electrical power train for the steerable axle of a motor vehicle |
| CN203186075U (en) * | 2012-12-26 | 2013-09-11 | 北京智行鸿远汽车技术有限公司 | Wheel motor drive axle for electric vehicle |
| CN103448537A (en) * | 2013-08-15 | 2013-12-18 | 安徽工程大学 | Motor-driven hub reduction system |
| DE102013223402A1 (en) * | 2013-11-15 | 2015-05-21 | Mtu Friedrichshafen Gmbh | Electro-mechanical hybrid drive and vehicle |
| CN105480069A (en) * | 2015-12-30 | 2016-04-13 | 北京新能源汽车股份有限公司 | Power system and vehicle with same |
| CN208232793U (en) * | 2018-02-23 | 2018-12-14 | 蔚来汽车有限公司 | Electric car and its bi-motor planetary gear power drive system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113858930A (en) * | 2021-10-28 | 2021-12-31 | 中国第一汽车股份有限公司 | Coaxial double-motor drive assembly and vehicle |
| WO2024032723A1 (en) * | 2022-08-10 | 2024-02-15 | 上海盘毂动力科技股份有限公司 | Electric drive system and design method therefor |
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