CN111674259A - Electric axle for a motor vehicle - Google Patents
Electric axle for a motor vehicle Download PDFInfo
- Publication number
- CN111674259A CN111674259A CN201910202499.7A CN201910202499A CN111674259A CN 111674259 A CN111674259 A CN 111674259A CN 201910202499 A CN201910202499 A CN 201910202499A CN 111674259 A CN111674259 A CN 111674259A
- Authority
- CN
- China
- Prior art keywords
- gear
- planetary
- planetary gear
- differential
- electric axle
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims 1
- 230000003321 amplification Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
Images
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
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 increased driving torque to the differential; the speed reducer includes a first planetary gear and a second planetary gear, the first planetary gear being configured to receive a driving torque from the input shaft and output to the second planetary gear; the first planetary transmission device comprises a sun gear, a first planet gear and a first gear ring, wherein the first gear ring comprises inner teeth and outer teeth; the second planetary transmission device comprises a second planetary gear and a planetary carrier; the first ring gear meshes with the second planet gears via its outer toothing, so that the first planetary gear and the second planetary gear are in driving connection, 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 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. Meanwhile, since the rotation speed of the input shaft is high, vibration and noise are large when the gear transmission device operates, and the operation is not smooth enough.
Therefore, there is a need for an electric axle that is compact and simple, low cost, has good lubrication properties, and has low 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:
the speed reducer comprises an input shaft, the speed reducer receives input driving torque through the input shaft and increases the driving torque to output the driving torque to the differential;
the speed reducer includes a first planetary gear and a second planetary gear, the first planetary gear being configured to receive a driving torque from the input shaft and output to the second planetary gear;
the first planetary transmission device comprises a sun gear, a first planet gear and a first gear ring, wherein the first gear ring comprises inner teeth and outer teeth;
the second planetary transmission device comprises a second planetary wheel and a planetary carrier;
the first ring gear meshes with the second planet gears by means of its external teeth, so that the first planetary gear and the second planetary gear are in driving connection, and the planet carrier is in driving connection with the differential;
wherein a drive torque is input from the input shaft to the sun gear of the first planetary gear, is transmitted to the second planetary gear via the first planetary gear and the first ring gear in order, and is output to the differential via the carrier of the second planetary gear.
According to an embodiment of the invention, the retarder further comprises a retarder housing, the first planet wheel axle fitted with the first planet wheels being configured to be fixed on the retarder housing.
According to an embodiment of the present invention, the second planetary gear further includes a second ring gear configured to be fixed to the reducer case.
According to an embodiment of the invention, the differential comprises a differential housing, the planet carrier of the second planetary gear being configured to be integrally formed with the differential housing.
According to an embodiment of the present invention, the differential outputs the driving torque to the wheels through bevel gears.
In the electric axle according to the present invention, the electric axle has an arrangement in which one planetary gear is embedded in another planetary gear, and therefore, the axial dimension of the electric axle can be reduced. 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 has the advantage of compact structure. Meanwhile, the electric axle has the advantages of simple structure, low cost, good lubricating performance and low noise.
Drawings
Fig. 1 shows a schematic view of an electric axle for a motor vehicle according to 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.
As shown in fig. 1, an electric axle 100 for a motor vehicle according to the present invention includes an electric motor 1, a speed reducer, and a differential.
The above components are described in detail below.
The electric motor 1 is drivingly connected to a retarder for providing a driving torque to the retarder through an electric motor output shaft.
The speed reducer includes an input shaft. The reduction gear is configured to receive an input drive torque through an input shaft and to increase the drive torque to output to a differential, which is configured to distribute the drive torque to a first wheel (not shown) drivingly connected to the first output shaft 10 and a second wheel (not shown) drivingly connected to the second output shaft 11 through the first output shaft 10 and the second output shaft 11, respectively.
The gear unit also comprises a first planetary gear, a second planetary gear, and a gear unit housing for accommodating the first planetary gear and the second planetary gear. The first planetary transmission is configured to receive drive torque from the input shaft and output to the second planetary transmission. Specifically, as shown in fig. 1, the first planetary gear includes a sun gear 2, first planetary gears 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 gears 3, and a first planetary gear shaft 4 fitted with the first planetary gears 3 is configured to be fixed to a reduction gear case. 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, the sun gear 2 receives the input torque as an input end of the first planetary gear to rotate, thereby transmitting the driving torque to the first planetary gear 3 engaged with the sun gear 2; then, since the first planetary gear shaft 4 fitted with the first planetary gear 3 is fixed to the reduction housing, as the sun gear 2 rotates, the first planetary gear 3 is driven by the sun gear 2 engaged therewith to rotate about the first planetary gear shaft 4 as the rotation axis and does not rotate around the sun gear 2; next, the first ring gear 5 meshing 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 the driving torque as an output end of the first planetary gear.
The second planetary gear set includes a second planetary gear 6, a planetary carrier 8, and a second ring gear 7, and the second ring gear 7 is configured to be fixed to a gear case. The first ring gear 5 meshes with the second planetary gear 6 via its outer toothing, so that the first planetary gear and the second planetary gear are in driving connection. As will be understood by those skilled in the art, the first ring gear 5 is used as a ring gear of the first planetary transmission device and also used as a sun gear of the second planetary transmission device, and in the electric axle 100 according to the embodiment of the invention, when the driving torque is input from the first ring gear 4 to the second planetary transmission device, the second planet gears 6 are driven to rotate by the first ring gear 4 engaged therewith, so that the planet carrier 8 is driven to rotate, and therefore, the planet carrier 8 outputs the driving torque as an output end of the second planetary transmission device.
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 present invention, the driving torque is input to the differential through the differential case 9 integrally formed with the carrier 8 of the second planetary gear, and then the differential outputs the driving torque to the two wheels through the bevel gears. However, those skilled in the art will appreciate that the carrier 8 and the differential case 9 are integrally formed as an example only, and the connection between the carrier 8 and the differential case 9 may be sufficient to achieve transmission of drive torque therebetween, and may be a mechanical fastener connection, for example.
Thus, the drive torque is input from the input shaft to the sun gear 2 of the first planetary gear, transmitted to the second planetary gear 6 via the first planetary gear 3 and the first ring gear 5 in order, and output to the differential via the carrier 8 of the second planetary gear 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 driving torque is input from the input shaft to the sun gear 2 of the first planetary gear set to rotate the sun gear 2 about the input shaft. Then, the sun gear 2 rotating around the input shaft drives the first planetary gears 3 to rotate by the meshing force between the gears, thereby transmitting the driving torque to the first planetary gears 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 drive torque to the first ring gear 5 meshing therewith to complete the transmission of the drive torque in the first planetary gear device with the sun gear 2 as an input end and the first ring gear 5 as an output end. Then, the first ring gear 5 serves as a sun gear of the second planetary gear, the second planetary gear 6 is driven to rotate by the meshing force between the gears, so that the driving torque is transmitted to the second planetary gear 6 meshed with the first ring gear and is transmitted to the planet carrier 8 so as to drive the planet carrier 8 to rotate, and the transmission of the driving torque with the first ring gear 5 as an input end and the planet carrier 8 as an output end in the second planetary gear is completed. Then, the drive torque is input into the differential from the differential case 9 integrally formed with the carrier 8, thereby achieving transmission of the drive torque from the reduction gear to the differential. Finally, the differential outputs drive torque to the two wheels via bevel gears.
In the electric axle according to the present invention, the electric axle has an arrangement in which one planetary gear (i.e., the first planetary gear described in the above embodiment) is embedded in the other planetary gear (i.e., the second planetary gear described in the above embodiment), and therefore, the axial dimension of the electric axle can be reduced. 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 has the advantage of compact structure.
In addition, in the electric axle according to the present invention, the first ring gear with internal teeth and external teeth serves as the first ring gear of the inner planetary gear as well as the sun gear of the outer planetary gear, and the carrier of the inner planetary gear can be omitted so that the planetary gear shaft is directly fixed to the reduction gear case, so that the electric axle according to the present invention has 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 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 (5)
1. An electric axle (100) for a motor vehicle, comprising:
the speed reducer comprises an input shaft, the speed reducer receives input driving torque through the input shaft and increases the driving torque to output the driving torque to the differential;
it is characterized in that the preparation method is characterized in that,
the speed reducer includes a first planetary gear and a second planetary gear, the first planetary gear being configured to receive a driving torque from the input shaft and output to the second planetary gear;
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 planetary wheel (6) and a planetary carrier (8);
the first ring gear (5) meshes with the second planet gears (6) by means of its external toothing, so that the first planetary gear and the second planetary gear are in driving connection, and the planet carrier (8) is in driving connection with the differential;
wherein the drive torque is input from the input shaft to the sun wheel (2) of the first planetary gear, transmitted in turn via the first planet wheel (3) and the first ring gear (5) to the second planet wheel (6), and output via the planet carrier (8) of the second planet wheel (6) to the differential.
2. The electric axle (100) according to claim 1, wherein the retarder further comprises a retarder housing on which the first planet wheel shaft (4) fitted with the first planet wheel (3) is configured to be fixed.
3. The electric axle (100) according to claim 2, wherein the second planetary transmission further comprises a second ring gear (7), the second ring gear (7) being configured to be fixed on the retarder housing.
4. The electric axle (100) according to claim 3, wherein the differential comprises a differential housing (9), the planet carrier (8) of the second planetary gear being configured to be integrally formed with the differential housing (9).
5. The electric axle (100) according to any of claims 1-4, wherein the differential outputs drive torque to the wheels through 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 true CN111674259A (en) | 2020-09-18 |
| CN111674259B 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) |
Cited By (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 |
Cited By (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 |
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| Publication number | Publication date |
|---|---|
| CN111674259B (en) | 2024-04-12 |
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