CN111674259B - Electric axle for a motor vehicle - Google Patents
Electric axle for a motor vehicle Download PDFInfo
- Publication number
- CN111674259B CN111674259B CN201910202499.7A CN201910202499A CN111674259B CN 111674259 B CN111674259 B CN 111674259B CN 201910202499 A CN201910202499 A CN 201910202499A CN 111674259 B CN111674259 B CN 111674259B
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- CN
- China
- Prior art keywords
- gear
- planetary
- differential
- planetary gear
- input shaft
- Prior art date
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- 230000005540 biological transmission Effects 0.000 claims abstract description 36
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- 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
-
- 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
- B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Retarders (AREA)
Abstract
The invention relates to an electric axle for a motor vehicle, comprising: the speed reducer comprises an input shaft, receives input driving torque through the input shaft, increases the driving torque and outputs the driving torque to the differential mechanism; the speed reducer includes a first planetary gear set configured to receive a driving torque from the input shaft and output to the second planetary gear set; the first planetary transmission device comprises a sun gear, a first planet gear and a first gear ring, wherein the first gear ring comprises internal teeth and external teeth; the second planetary transmission device comprises a second planet wheel and a planet carrier; the first ring gear meshes with the second planetary gear via its outer teeth, so that the first planetary gear is in driving connection with the second planetary gear, and the planet carrier is in driving connection with the differential.
Description
Technical Field
The present invention relates to the field of motor vehicles, and more particularly to electric axles for motor vehicles.
Background
In a pure electric vehicle or a hybrid vehicle using an electric motor, an electric vehicle axle is employed that includes an electric motor, a speed reducer, and a differential. Typically, the reduction gear comprises a gear transmission and an input shaft for connection with an output shaft of the electric motor for receiving the drive torque, the gear transmission being arranged in driving connection with the input shaft and receiving the drive torque from the input shaft. Because the arrangement space of the electric axle on the motor vehicle is smaller, a large speed ratio is difficult to realize, and the electric axle with the large speed ratio can reduce the required torque of the motor, so that the cost of the motor is effectively reduced, the cost of the electric axle assembly is further reduced, and if the large speed ratio is required to be realized, the space occupied by the electric axle is too large. Meanwhile, since the rotation speed of the input shaft is fast, vibration and noise are large and the operation is not stable enough when the gear transmission operates.
Therefore, there is a need for an electric axle that is compact and simple in construction, low in cost, good in lubrication performance, and low in noise.
Disclosure of Invention
The invention aims to provide an electric axle which is compact and simple in structure, low in cost, good in lubricating performance and low in noise.
The invention provides an electric axle for a motor vehicle, comprising:
a speed reducer and a differential, wherein the speed reducer comprises an input shaft, receives input driving torque through the input shaft and increases the driving torque to be output to the differential;
the speed reducer includes a first planetary gear device configured to receive a driving torque from the input shaft and output to a second planetary gear device;
the first planetary transmission device comprises a sun gear, a first planet gear and a first gear ring, wherein the first gear ring comprises internal teeth and external teeth;
the second planetary transmission device comprises a second planet wheel and a planet carrier;
the first gear ring is meshed with the second planetary gear through external teeth of the first gear ring, so that the first planetary gear device and the second planetary gear device are in transmission connection, and the planet carrier is in transmission connection with the differential mechanism;
wherein a drive torque is input from the input shaft to the sun gear of the first planetary transmission, transmitted to the second planetary gear via the first planetary gear and the first ring gear in turn, and output to the differential via the carrier of the second planetary gear.
According to an embodiment of the invention, the reducer further comprises a reducer housing, on which the first planetary wheel axle fitted with the first planetary wheel is configured to be fixed.
According to an embodiment of the invention, the second planetary transmission further comprises a second ring gear configured to be fixed to the reducer housing.
According to an embodiment of the invention, the differential comprises a differential housing, the planet carrier of the second planetary transmission being configured to be integrally formed with the differential housing.
According to an embodiment of the present invention, the differential outputs driving torque to wheels through bevel gears.
In the electric vehicle axle according to the invention, the electric vehicle axle has an arrangement in which one planetary gear is embedded into the other planetary gear, and therefore, the axial dimension of the electric vehicle axle can be reduced. Moreover, the planetary transmission device has the characteristics of small volume and large speed ratio, so that the driving torque amplifying function of the speed reducer can be improved, and the radial size of a gear in the connecting transmission device can be reduced, thereby reducing the radial size of the electric axle. Therefore, the electric vehicle axle according to the present invention has an advantage of compact structure. Meanwhile, the electric vehicle axle has the advantages of simple structure, low cost, good lubricating performance and low noise.
Drawings
Fig. 1 shows a schematic illustration of an electric axle for a motor vehicle according to the invention.
Detailed Description
In the following, a specific embodiment of an electric axle for a motor vehicle according to the invention will be described with reference to the accompanying drawings. The following detailed description and the accompanying drawings are provided to illustrate the principles of the invention and not to limit the invention to the preferred embodiments described, the scope of which is defined by the claims.
As shown in fig. 1, an electric axle 100 for a motor vehicle according to the present invention includes an electric motor 1, a reduction gear, and a differential.
The above components are described in detail below.
The electric motor 1 is in driving connection with a reduction gear for providing a driving torque to the reduction gear via the motor output.
The decelerator includes an input shaft. The speed reducer is configured to receive an input driving torque through the input shaft and to increase the driving torque and output the driving torque to the differential, and the differential is configured to distribute the driving torque to a first wheel (not shown) in driving connection with the first output shaft 10 and a second wheel (not shown) in driving connection with the second output shaft 11 through the first output shaft 10 and the second output shaft 11, respectively.
The reduction gear further includes a first planetary gear, a second planetary gear, and a reduction gear housing for accommodating the first planetary gear and the second planetary gear. The first planetary transmission is configured to receive a drive torque from the input shaft and output to the second planetary transmission. Specifically, as shown in fig. 1, the first planetary transmission includes a sun gear 2, a first planetary gear 3, and a first ring gear 5, the first ring gear 5 includes internal teeth and external teeth, the internal teeth of the first ring gear 5 are for meshing with the first planetary gear 3, and a first planetary wheel shaft 4 equipped with the first planetary gear 3 is configured to be fixed to a speed reducer case. As will be appreciated by those skilled in the art, in the electric axle 100 according to the embodiment of the present invention, when a driving torque is input from the input shaft to the first planetary gear, the sun gear 2 rotates as the input of the first planetary gear, thereby transmitting the driving torque to the first planetary gear 3 meshed with the sun gear 2; thereafter, since the first planetary gear shaft 4 equipped with the first planetary gear 3 is fixed to the reduction case, as the sun gear 2 rotates, the first planetary gear 3 is driven by the sun gear 2 engaged therewith to rotate with the first planetary gear shaft 4 as the rotation axis and not to rotate around the sun gear 2; next, the first ring gear 5 meshed with the first planetary gear 3 is driven to rotate with the rotation of the first planetary gear 3, so that the first ring gear 5 outputs a driving torque as an output of the first planetary gear.
The second planetary gear includes a second planetary gear 6, a carrier 8, and a second ring gear 7, and the second ring gear 7 is configured to be fixed to the reduction gear housing. The first ring gear 5 meshes with the second planetary gears 6 via its outer teeth, so that the first planetary gear is in driving connection with the second planetary gear. As will be appreciated by those skilled in the art, in the electric axle 100 according to the embodiment of the present invention, when the drive torque is input from the first ring gear 4 to the second planetary gear, the second planetary gear 6 is driven to rotate by the first ring gear 4 engaged therewith, thereby driving the carrier 8 to rotate, and thereby the carrier 8 outputs the drive torque as an output of the second planetary gear, while the first ring gear 5 is used as a ring gear of the first planetary gear.
Furthermore, the differential comprises a differential housing 9, the planet carrier 8 of the second planetary gear being configured as one piece with the differential housing 9, so that the planet carrier 8 is in driving connection with the differential. In the electric axle according to the embodiment of the invention, the drive torque is input into the differential through the differential case 9 integrally formed with the carrier 8 of the second planetary transmission, after which the differential outputs the drive torque to the two wheels through the bevel gears. However, it will be appreciated by those skilled in the art that the integration of the carrier 8 with the differential case 9 is merely an example, and that the connection between the carrier 8 and the differential case 9 may be a mechanical fastener connection, for example, as long as the transmission of drive torque therebetween is achieved.
Thus, the drive torque is input from the input shaft to the sun gear 2 of the first planetary transmission, is transmitted in turn via the first planet gears 3 and the first ring gear 5 to the second planet gears 6, and is output to the differential via the planet carrier 8 of the second planet gears 6.
The following describes a transmission process of the driving torque of the electric axle 100 according to the embodiment of the present invention.
A drive torque is input from the input shaft to the sun gear 2 of the first planetary transmission to rotate the sun gear 2 about the input shaft. Then, the sun gear 2 rotating around the input shaft drives the first planetary gear 3 to rotate by the meshing force between the gears, thereby transmitting the driving torque to the first planetary gear 3 meshing therewith. Next, the rotating first planetary gear 3 drives the first ring gear 5 to rotate by the meshing force between the gears, thereby transmitting the driving torque to the first ring gear 5 meshing therewith to complete the transmission of the driving torque with the sun gear 2 as an input and the first ring gear 5 as an output in the first planetary transmission. Thereafter, the first ring gear 5 serves as a sun gear of the second planetary gear, and the second planetary gear 6 is driven to rotate by an meshing force between gears, thereby transmitting a driving torque to the second planetary gear 6 meshing therewith and thereby to the carrier 8 to thereby drive the carrier 8 to rotate, so that transmission of the driving torque with the first ring gear 5 as an input and the carrier 8 as an output in the second planetary gear is completed. After that, the drive torque is input into the differential from the differential case 9 integrally formed with the carrier 8, so that the drive torque is transmitted from the reduction gear to the differential. Finally, the differential outputs drive torque to the two wheels through bevel gears.
In the electric vehicle axle according to the present invention, the electric vehicle axle has an arrangement in which one planetary transmission (i.e., the first planetary transmission described in the above-described embodiment) is embedded in the other planetary transmission (i.e., the second planetary transmission described in the above-described embodiment), and therefore, the axial dimension of the electric vehicle axle can be reduced. Moreover, the planetary transmission device has the characteristics of small volume and large speed ratio, so that the driving torque amplifying function of the speed reducer can be improved, and the radial size of a gear in the connecting transmission device can be reduced, thereby reducing the radial size of the electric axle. Therefore, the electric vehicle axle according to the present invention has an advantage of compact structure.
Furthermore, in the electric vehicle axle according to the invention, the first ring gear with the internal teeth and the external teeth is used as the first ring gear of the inner planetary gear and also as the sun gear of the outer planetary gear, and the planet carrier of the inner planetary gear can be omitted so that the planet axle is directly fixed to the reduction gear housing, so that the electric vehicle axle according to the invention has the advantages of simple structure, low cost, good lubrication performance and low noise.
As described above, although the exemplary embodiments of the present invention have been described in the description with reference to the accompanying drawings, the present invention is not limited to the above-described specific embodiments, and the scope of the present invention should be defined by the claims and their equivalents.
Claims (5)
1. An electric axle (100) for a motor vehicle, comprising:
a speed reducer and a differential, wherein the speed reducer comprises an input shaft, receives input driving torque through the input shaft and increases the driving torque to be output to the differential;
it is characterized in that the method comprises the steps of,
the speed reducer includes a first planetary gear device configured to receive a driving torque from the input shaft and output to a second planetary gear device;
the first planetary transmission device comprises a sun gear (2), a first planet gear (3) and a first gear ring (5), wherein the first gear ring (5) comprises internal teeth and external teeth;
the second planetary transmission device comprises a second planet wheel (6) and a planet carrier (8);
the first ring gear (5) meshes with the second planetary gear (6) via its external toothing, so that the first planetary gear is in driving connection with the second planetary gear, and the planet carrier (8) is in driving connection with the differential;
wherein a drive torque is input from the input shaft to the sun gear (2) of the first planetary transmission, is transmitted to the second planetary gear (6) via the first planetary gear (3) and the first ring gear (5) in turn, and is output to the differential via the planet carrier (8) of the second planetary gear (6).
2. The electric vehicle axle (100) of claim 1, wherein the reducer further comprises a reducer housing, to which a first planetary axle (4) fitted with the first planetary (3) is configured to be fixed.
3. The electric vehicle axle (100) of claim 2, wherein the second planetary transmission further comprises a second ring gear (7), the second ring gear (7) being configured to be fixed to the reducer housing.
4. An electric vehicle axle (100) according to claim 3, wherein the differential comprises a differential housing (9), the planet carrier (8) of the second planetary transmission being configured to be integrally formed with the differential housing (9).
5. The electric vehicle axle (100) of any of claims 1-4, wherein the differential outputs drive torque to the wheels via bevel gears.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910202499.7A CN111674259B (en) | 2019-03-11 | 2019-03-11 | Electric axle for a motor vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910202499.7A CN111674259B (en) | 2019-03-11 | 2019-03-11 | Electric axle for a motor vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111674259A CN111674259A (en) | 2020-09-18 |
| CN111674259B true CN111674259B (en) | 2024-04-12 |
Family
ID=72433177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910202499.7A Active CN111674259B (en) | 2019-03-11 | 2019-03-11 | Electric axle for a motor vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111674259B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023178557A1 (en) * | 2022-03-23 | 2023-09-28 | 精进电动科技股份有限公司 | Transverse driving assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201351712Y (en) * | 2008-11-27 | 2009-11-25 | 国茂减速机集团有限公司 | Differential type internal-tooth-free planet gear speed reducer |
| CN102748432A (en) * | 2012-07-24 | 2012-10-24 | 徐工集团工程机械股份有限公司科技分公司 | Speed reducer |
| DE102012007656B3 (en) * | 2012-04-14 | 2013-07-18 | ZG-Zahnräder und Getriebe GmbH | Final drive for motor car, has planetary gears that are coupled indirectly or directly to differential gear boxes in common rotational axis |
| CN104896027A (en) * | 2015-05-22 | 2015-09-09 | 张洲 | Planetary transmission |
| DE102015104778A1 (en) * | 2015-03-27 | 2016-09-29 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Electric final drive for a motor vehicle |
| CN106555848A (en) * | 2015-09-25 | 2017-04-05 | 比亚迪股份有限公司 | Power-driven system and the vehicle with which |
-
2019
- 2019-03-11 CN CN201910202499.7A patent/CN111674259B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201351712Y (en) * | 2008-11-27 | 2009-11-25 | 国茂减速机集团有限公司 | Differential type internal-tooth-free planet gear speed reducer |
| DE102012007656B3 (en) * | 2012-04-14 | 2013-07-18 | ZG-Zahnräder und Getriebe GmbH | Final drive for motor car, has planetary gears that are coupled indirectly or directly to differential gear boxes in common rotational axis |
| CN102748432A (en) * | 2012-07-24 | 2012-10-24 | 徐工集团工程机械股份有限公司科技分公司 | Speed reducer |
| DE102015104778A1 (en) * | 2015-03-27 | 2016-09-29 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Electric final drive for a motor vehicle |
| CN104896027A (en) * | 2015-05-22 | 2015-09-09 | 张洲 | Planetary transmission |
| CN106555848A (en) * | 2015-09-25 | 2017-04-05 | 比亚迪股份有限公司 | Power-driven system and the vehicle with which |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111674259A (en) | 2020-09-18 |
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