CN218986351U - Electric drive axle - Google Patents
Electric drive axle Download PDFInfo
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- CN218986351U CN218986351U CN202223569693.5U CN202223569693U CN218986351U CN 218986351 U CN218986351 U CN 218986351U CN 202223569693 U CN202223569693 U CN 202223569693U CN 218986351 U CN218986351 U CN 218986351U
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- gear
- stage planetary
- planetary gear
- electric drive
- drive axle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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Abstract
The utility model relates to the technical field of vehicle driving, and provides an electric drive axle, which comprises: a driving motor; the first sun gear of the first-stage planetary gear is driven by the driving motor, the first planet carrier of the first-stage planetary gear is connected with the second sun gear of the second-stage planetary gear, the second planet carrier of the second-stage planetary gear is connected with the hub, and the second outer gear ring of the second-stage planetary gear is connected with the fixed shell; and one end of the shifting mechanism is connected with the first outer gear ring of the first-stage planetary gear, and the other end of the shifting mechanism is at least switchably connected with the fixed shell or the first planet carrier. The electric drive axle can realize multi-gear drive of the electric drive axle assembled with the planetary gear set by utilizing the two-stage planetary gears and the gear shifting mechanism which are connected in series, and meets the requirements of dynamic property and economy of vehicles.
Description
Technical Field
The utility model relates to the technical field of vehicle driving, in particular to an electric drive axle.
Background
The electric drive axle is assembled in a new energy vehicle, and provides power for the hub through the driving motor. In order to make the electric drive axle have a wider output rotation speed, the electric drive axle is generally required to be configured with a multi-gear speed change output function.
Currently, multiple speed variable output is achieved by using parallel shaft gear sets. If the multi-gear speed change output scheme is applied to an electric drive axle provided with a planetary gear set, the whole structure of the electric drive axle needs to be changed, so that the problems of additional control components, whole vehicle arrangement space and the like are caused, and the cost is high.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the utility model and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
In view of the above, the present utility model provides an electric transaxle capable of realizing multi-speed driving of an electric transaxle equipped with a planetary gear set using two-stage planetary gears and a shift mechanism connected in series, satisfying power performance and economical demands of a vehicle.
According to one aspect of the present utility model, there is provided an electric drive axle comprising: a driving motor; the first sun gear of the first-stage planetary gear is driven by the driving motor, the first planet carrier of the first-stage planetary gear is connected with the second sun gear of the second-stage planetary gear, the second planet carrier of the second-stage planetary gear is connected with the hub, and the second outer gear ring of the second-stage planetary gear is connected with the fixed shell; and one end of the shifting mechanism is connected with the first outer gear ring of the first-stage planetary gear, and the other end of the shifting mechanism is at least switchably connected with the fixed shell or the first planet carrier.
In some embodiments, the fixed housing is connected to the other end of the gear shifting mechanism, and the first sun gear, the first planet carrier, the second sun gear and the second planet carrier form a first transmission path of the driving motor to the hub.
In some embodiments, the gear ratio R1 of the first transmission path satisfies: r1=r11×r22, where R11 is the gear ratio of the first stage planetary gear and R22 is the gear ratio of the second stage planetary gear.
In some embodiments, the first planet carrier is connected to the other end of the gear shifting mechanism, and the first-stage planetary gear, the second sun gear and the second planet carrier form a second transmission path from the driving motor to the hub.
In some embodiments, the gear ratio R2 of the second transmission path satisfies: r2=r22, where R22 is the gear ratio of the second stage planetary gear.
In some embodiments, the other end of the shift mechanism is also switchably connected to the second planet carrier.
In some embodiments, the second planet carrier is connected to the other end of the gear shifting mechanism, and a third transmission path of the driving motor to the hub includes: a first power transmission path formed by the first sun gear, the first carrier, the second sun gear, and the second carrier; a second power transmission path is formed by the first sun gear, the first ring gear, and the second carrier.
In some embodiments, the gear ratio R3 of the third transmission path satisfies: r3= (r11+1) × (r22+1) -R11, where R11 is the gear ratio of the first stage planetary gear and R22 is the gear ratio of the second stage planetary gear.
In some embodiments, the first stage planetary gear is integrally disposed in a rotor of the drive motor.
In some embodiments, the electric drive axle is a distributed wheel-side electric drive axle.
Compared with the prior art, the utility model has the beneficial effects that at least:
the first sun gear of the first-stage planetary gear is driven by a driving motor to serve as a power source through two stages of planetary gears connected in series; the first planet carrier of the first-stage planetary gear is connected with the second sun gear of the second-stage planetary gear, and power is transmitted to the second-stage planetary gear; the second planet carrier of the second-stage planetary gear is connected with the hub to realize power transmission to the wheel end;
the first outer gear ring of the first-stage planetary gear is connected with the fixed shell/the first planet carrier through a gear shifting mechanism, so that the output of different speed ratios of the electric drive axle is realized;
therefore, the electric drive axle can realize multi-gear drive of the electric drive axle assembled with the planetary gear set by utilizing the two-stage planetary gears and the gear shifting mechanism which are connected in series, and meets the requirements of dynamic property and economy of vehicles.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIGS. 1 and 2 are schematic views showing the structure of an electric drive axle having a two-speed drive function in an embodiment of the present utility model;
fig. 3 to 5 show schematic structural views of an electric drive axle with a three-gear drive function in an embodiment of the present utility model.
The main reference numerals:
10. driving motor
20. First-stage planetary gear
21. First sun gear
22. First planet carrier
24. First outer gear ring
30. Second-stage planetary gear
31. Second sun gear
32. Second planet carrier
34. Second external gear ring
40. Hub
50. Fixed shell
60. Gear shifting mechanism
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.
The use of the terms "first," "second," and the like in the description herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. It should be noted that, without conflict, the embodiments of the present utility model and features in different embodiments may be combined with each other.
Fig. 1 and 2 show the structure of an electric transaxle having a two-stage drive function in the embodiment, and fig. 3 to 5 show the structure of an electric transaxle having a three-stage drive function in the embodiment; referring to fig. 1 to 5, an electric drive axle according to an embodiment of the present utility model includes:
a drive motor 10;
a series of two-stage planetary gears, wherein the first sun gear 21 of the first-stage planetary gear 20 is driven by the driving motor 10, the first carrier 22 of the first-stage planetary gear 20 is connected with the second sun gear 31 of the second-stage planetary gear 30, the second carrier 32 of the second-stage planetary gear 30 is connected with the hub 40, and the second ring gear 34 of the second-stage planetary gear 30 is connected with the stationary housing 50;
a shift mechanism 60 having one end connected to the first outer ring gear 24 of the first-stage planetary gear 20 and the other end switchably connected to at least the stationary housing 50 or the first carrier 22.
The drive motor 10 specifically includes a stator 11 and a rotor 12; the first sun gear 21 is driven by the rotor 12 as a power source, and transmits power to the first carrier 22 through the first planetary gears 23 of the first-stage planetary gears 20. The first carrier 22 is connected to the second sun gear 31, and transmits power to the second-stage planetary gears 30. The second sun gear 31 transmits power to the second carrier 32 through the second planet gears 33 of the second stage planetary gears 30. The second carrier 32 is coupled to the hub 40 to transfer power to the wheel end to drive the tire 44 in rotation. The gear shifting mechanism 60 can connect the first external ring gear 24 with the fixed housing 50 or the first carrier 22 under a gear shifting operation, so as to realize the output of two speed ratios of the electric drive axle.
Thus, the electric transaxle described above can realize multi-stage driving of an electric transaxle in which a planetary gear set is assembled, using the first-stage planetary gear 20 and the second-stage planetary gear 30 connected in series, and the shift mechanism 60, satisfying the power performance and economical demands of the vehicle.
In some embodiments, referring to fig. 1 and 3, the fixed housing 50 is connected to the other end of the gear shifting mechanism 60, and the first sun gear 21, the first planet carrier 22, the second sun gear 31 and the second planet carrier 32 form a first transmission path of the driving motor 10 to the hub 40.
In the present embodiment, the first external ring gear 24 is connected to the stationary housing 50 through the shift mechanism 60; at this time, the first sun gear 21 transmits the power of the driving motor 10 to the hub 40 through the first carrier 22, the second sun gear 31, and the second carrier 32.
Further, the gear ratio R1 of the first transmission path satisfies: r1=r11×r22, where R11 is the gear ratio of the first stage planetary gear 20 and R22 is the gear ratio of the second stage planetary gear 30.
The total output speed ratio of the first transmission path, i.e., transmission ratio R1, is the product of the transmission ratios of the two-stage planetary gears.
In some embodiments, referring to fig. 2 and 4, the first planet carrier 22 is connected to the other end of the gear shifting mechanism 60, and the first stage planetary gear 20, the second sun gear 31 and the second planet carrier 32 form a second transmission path of the driving motor 10 to the hub 40.
In the present embodiment, the first external ring gear 24 is connected to the first carrier 22 through a shift mechanism 60; at this time, the output speed ratio of the first-stage planetary gear 20 is 1, and the second-stage planetary gear 30 inputs power from the drive motor 10 through the second sun gear 31 and outputs the power to the hub 40 through the second carrier 32.
Further, the gear ratio R2 of the second transmission path satisfies: r2=r22, where R22 is the gear ratio of the second stage planetary gear 30.
The output speed ratio of the second transmission path, i.e., the transmission ratio of the second stage planetary gear 30.
In some embodiments, referring to fig. 5, the other end of the shift mechanism 60 is also switchably connected to the second carrier 32. In this way, three speed ratio outputs of the electric transaxle can be realized. That is, in the present embodiment, the first ring gear 24 may be fixed to the stationary housing 50 by the shift mechanism 60 to transmit the power of the drive motor 10 to the hub 40 through the first transmission path described above, the first ring gear 24 may be fixed to the first carrier 22 to transmit the power of the drive motor 10 to the hub 40 through the second transmission path described above, and the first ring gear 24 may be fixed to the second carrier 32 to transmit the power of the drive motor 10 to the hub 40 through the third transmission path described below. Thus, three speed ratios of the electric drive axle are output.
In some embodiments, the second planet carrier 32 is connected to the other end of the gear shifting mechanism 60, and the third transmission path of the driving motor 10 to the hub 40 includes: a first power transmission path formed by the first sun gear 21, the first carrier 22, the second sun gear 31, and the second carrier 32; the second power transmission path is formed by the first sun gear 21, the first ring gear 24, and the second carrier 32.
In the present embodiment, the first external ring gear 24 is connected to the second carrier 32 through the shift mechanism 60; at this time, the power from the driving motor 10 of the first sun gear 21 is transmitted to the second sun gear 31 and the second carrier 32 through the first carrier 22 and the first ring gear 24 simultaneously according to the first power transmission path and the second power transmission path, respectively, and the final power is output to the hub 40 after the second carrier 32 is coupled.
Further, the gear ratio R3 of the third transmission path satisfies: r3= (r11+1) × (r22+1) -R11, where R11 is the gear ratio of the first stage planetary gear 20 and R22 is the gear ratio of the second stage planetary gear 30.
In the above embodiments, the first-stage planetary gear 20 may be integrally provided in the rotor 12 of the driving motor 10, so that the sun gear shaft 21' of the first sun gear 21 is coaxial with the rotor 12, to reduce the arrangement space of the planetary gear set, and to make the electric drive axle compact.
In the above embodiments, the electric drive axle may be a distributed wheel-side electric drive axle. The distributed wheel-side electric drive axle is applied to new energy commercial vehicles, and has higher requirements on the dynamic property and the economical efficiency of multi-gear driving; according to the scheme, the planetary gear set is utilized to realize multi-gear driving of the distributed wheel-side electric drive axle, so that the dynamic property and economical requirement of a new energy commercial vehicle can be better met.
Of course, the electric drive axle can be of other types, and the requirements of the dynamic property and the economical efficiency of the vehicle can be met through the scheme of the utility model, so that the application scene of the vehicle can be matched better.
In summary, the electric drive axle of the utility model has the following beneficial effects:
through two stages of planetary gears connected in series, wherein a first sun gear 21 of a first stage of planetary gears 20 is driven by the driving motor 10 as a power source; the first carrier 22 of the first-stage planetary gear 20 is connected to the second sun gear 31 of the second-stage planetary gear 30, and transmits power to the second-stage planetary gear 30; the second planet carrier 32 of the second stage planetary gear 30 is connected with the hub 40 to realize power transmission to the wheel end; the first outer gear ring 24 of the first-stage planetary gear 20 is connected with the fixed shell 50/the first planet carrier 22/the second planet carrier 32 through the gear shifting mechanism 60, so that the output of different speed ratios of the electric drive axle is realized; therefore, the electric drive axle of the utility model can realize multi-gear drive of the electric drive axle assembled with the planetary gear set by utilizing the first-stage planetary gear 20, the second-stage planetary gear 30 and the gear shifting mechanism 60 which are connected in series, and meets the power performance and economical requirements of vehicles.
The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.
Claims (10)
1. An electric drive axle, comprising:
a driving motor;
the first sun gear of the first-stage planetary gear is driven by the driving motor, the first planet carrier of the first-stage planetary gear is connected with the second sun gear of the second-stage planetary gear, the second planet carrier of the second-stage planetary gear is connected with the hub, and the second outer gear ring of the second-stage planetary gear is connected with the fixed shell;
and one end of the shifting mechanism is connected with the first outer gear ring of the first-stage planetary gear, and the other end of the shifting mechanism is at least switchably connected with the fixed shell or the first planet carrier.
2. The electric drive axle of claim 1, wherein the first sun gear, the first planet carrier, the second sun gear, and the second planet carrier form a first transmission path for the drive motor to the hub at the other end of the gear shifting mechanism.
3. The electric drive axle of claim 2, wherein the gear ratio R1 of the first transmission path satisfies:
r1=r11×r22, where R11 is the gear ratio of the first stage planetary gear and R22 is the gear ratio of the second stage planetary gear.
4. The electric drive axle of claim 1, wherein the first stage planetary gear, the second sun gear, and the second planet carrier form a second transmission path for the drive motor to the hub at the other end of the shift mechanism.
5. The electric drive axle of claim 4, wherein the gear ratio R2 of the second transmission path satisfies:
r2=r22, where R22 is the gear ratio of the second stage planetary gear.
6. The electric drive axle of claim 1, wherein the other end of the shift mechanism is also switchably connected to the second carrier.
7. The electric drive axle of claim 6, wherein the second carrier is connected to the other end of the shift mechanism, and the third transmission path of the drive motor to the hub comprises:
a first power transmission path formed by the first sun gear, the first carrier, the second sun gear, and the second carrier;
a second power transmission path is formed by the first sun gear, the first ring gear, and the second carrier.
8. The electric drive axle of claim 7, wherein the gear ratio R3 of the third gear path satisfies:
r3= (r11+1) × (r22+1) -R11, where R11 is the gear ratio of the first stage planetary gear and R22 is the gear ratio of the second stage planetary gear.
9. The electric drive axle of claim 1, wherein the first stage planetary gear is integrally disposed in a rotor of the drive motor.
10. The electric drive axle of any one of claims 1-9, wherein the electric drive axle is a distributed wheel-side electric drive axle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223569693.5U CN218986351U (en) | 2022-12-30 | 2022-12-30 | Electric drive axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223569693.5U CN218986351U (en) | 2022-12-30 | 2022-12-30 | Electric drive axle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218986351U true CN218986351U (en) | 2023-05-09 |
Family
ID=86217237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223569693.5U Active CN218986351U (en) | 2022-12-30 | 2022-12-30 | Electric drive axle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218986351U (en) |
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2022
- 2022-12-30 CN CN202223569693.5U patent/CN218986351U/en active Active
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