CN213799264U - Transmission mechanism and driving system for motor vehicle - Google Patents
Transmission mechanism and driving system for motor vehicle Download PDFInfo
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- CN213799264U CN213799264U CN202022328714.9U CN202022328714U CN213799264U CN 213799264 U CN213799264 U CN 213799264U CN 202022328714 U CN202022328714 U CN 202022328714U CN 213799264 U CN213799264 U CN 213799264U
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- 230000007246 mechanism Effects 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 title claims description 31
- 230000009467 reduction Effects 0.000 claims abstract description 27
- 230000008859 change Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 238000002485 combustion reaction Methods 0.000 description 1
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Abstract
The utility model provides a drive mechanism for motor vehicles, include: a differential having a differential case on which a main reduction gear is provided; two output shafts extending from both sides of the differential; a first gear group composed of a first gear and a second gear that mesh with each other, power for driving the vehicle to travel being input to the first gear; a second gear set composed of a third gear and a main reduction gear which are meshed with each other, wherein the third gear and the second gear are coaxially arranged; a third gear set consisting of a fourth gear and a fifth gear which are meshed with each other, wherein the fourth gear and the second gear are coaxially arranged, and the fifth gear and the two output shafts are coaxially arranged; a fourth gear set including a sixth gear and a seventh gear fixed on the same shaft, the sixth gear being engaged with the fifth gear, the seventh gear being engaged with the main reduction gear; and a switching device disposed coaxially with and driven by the second gear and capable of selectively engaging the third gear or the fourth gear.
Description
Technical Field
The utility model relates to a drive mechanism for motor vehicles with two keep off position. In addition, the present invention relates to a drive system for a motor vehicle comprising such a transmission.
Background
The pure electric vehicle is a vehicle which takes a vehicle-mounted power supply as power and drives wheels to run by using a motor. The pure electric vehicle has smaller influence on the environment than an internal combustion engine vehicle, so the prospect is widely seen, and in consideration of the requirements of motor power density and arrangement space, an electric drive system is developing towards the direction of integration and multiple gears.
Compared with a single-gear system, the two-gear electric drive system gives consideration to the axle load torque and the highest vehicle speed, and the higher speed ratio provides possibility for the miniaturization and integration of the motor. In addition, the two-gear electric drive system can compensate power reduction caused by rotation speed increase by transferring the working point of the high rotation speed area to the low rotation speed, so that efficiency is improved, and the high-efficiency area of the motor is widened.
However, the two-gear electric drive system of the prior art can only achieve two-stage speed reduction when operating in either the first gear or the second gear, which limits the output torque of the vehicle when traveling at low speeds.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve a drive mechanism for motor vehicles of above-mentioned problem, drive mechanism includes: the differential mechanism is provided with a differential mechanism shell, and a main reduction gear is arranged on the differential mechanism shell; two output shafts extending from both sides of the differential, the two output shafts transmitting power to wheels of a vehicle, respectively; a first gear set constituted by a first gear and a second gear that mesh with each other, the first gear being disposed coaxially with the two output shafts, power for driving a vehicle to travel being input to the first gear; a second gear set composed of a third gear and the main reduction gear on the differential case, wherein the third gear is meshed with the second gear; a third gear set composed of a fourth gear and a fifth gear which are engaged with each other, the fourth gear and the second gear being coaxially arranged, the fifth gear and the two output shafts being coaxially arranged; a fourth gear set including a sixth gear and a seventh gear fixed on the same shaft, the sixth gear meshing with the fifth gear, the seventh gear meshing with the main reduction gear on the differential case; and a switching device that is disposed coaxially with and driven by the second gear, and that is capable of selectively engaging the third gear or the fourth gear.
By arranging the switching device, the transmission mechanism can realize two-stage speed change. In addition, the fourth gear is meshed with the fifth gear, and the seventh gear is meshed with the main reduction gear on the differential shell, so that the transmission mechanism running in the second gear can realize four-stage speed reduction.
Additionally, the present invention also provides a drive system for a motor vehicle, the drive system comprising: a motor having a hollow rotor shaft; the above transmission mechanism, wherein the hollow rotor shaft of the motor is disposed coaxially with the two output shafts, and is coupled to the first gear of the first gear set of the transmission mechanism.
Drawings
The details and advantages of the present invention will be more readily understood from the following description taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic view of a drive system for a motor vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the drive system when the transmission is operating in the first gear; and is
Fig. 3 is a schematic view of the drive system when the transmission is operating in the second gear.
Detailed Description
An embodiment according to the invention is further explained below with reference to the drawings.
Fig. 1 shows a drive system for a motor vehicle according to an embodiment of the invention in a schematic view. The drive system comprises an electric machine 2 as an engine and a transmission 3 with two gears.
The transmission mechanism 3 includes a differential 10, and the differential 10 has a differential case 11, and a final reduction gear 12 is provided on the differential case 11. The transmission 3 further comprises two output shafts 20 extending from both sides of the differential 10, the two output shafts 20 being coupled to wheels (not shown) of the vehicle. Power from an engine (e.g., an electric motor) is transmitted to a final gear 12 on a differential case 11, thereby driving the differential 10 to rotate. As is well known to those skilled in the art, the differential 10, through planetary gears and side gears disposed therein, rotates two output shafts 20, thereby transmitting power to the wheels of the vehicle.
In addition, two hollow support shafts 30 provided coaxially with the two output shafts 20 may be fixed to both sides of the differential case 11, the two support shafts 30 being rotatably supported by bearings, whereby the differential 10 is also rotatably supported. However, the present invention is not limited thereto, and the differential case 11 may be rotatably supported by other means known to those skilled in the art.
As shown in fig. 1, the motor 2 has a hollow rotor shaft 40 fixed to the rotor, the hollow rotor shaft 40 being disposed coaxially with the output shaft 20 of the differential 10, so that the drive system shown in fig. 1 is a so-called coaxial electric drive system.
As described above, the transmission mechanism 3 according to the present invention can realize speed change. The shifting function is achieved by a switching device 50, which will be described in detail below.
The transmission mechanism 3 includes a first gear set constituted by a first gear 51 and a second gear 52 that mesh with each other. The first gear wheel 51 is arranged coaxially with the two output shafts 20 of the differential 10 and thus also with the hollow rotor shaft 40 of the electric machine 2. In this example, the first gear 51 may be rotatably provided on the support shaft 30 fixed to the differential case 11 through a bearing. However, the present invention is not limited thereto, and the first gear 51 may be coaxially disposed with the output shaft 20 of the differential 10 and rotatably supported by other means known to those skilled in the art. The hollow rotor shaft 40 of the motor 2 is coupled to the first gear 51, and thus power for driving the vehicle to travel is input to the first gear 51. In this example, the radius of the first gear 51 is smaller than the radius of the second gear 52 to achieve deceleration. In addition, second gear 52 is fixed for common rotation with rotatable first intermediate shaft 60. As shown, the first intermediate shaft 60 may be rotatably supported by bearings.
The transmission mechanism 3 includes a second gear set constituted by a third gear 53 and a final reduction gear 12 on the differential case 11 that mesh with each other. The third gear 53 is coaxially disposed with the second gear 52 of the first gear set. More specifically, the third gear 53 is rotatably provided on the first intermediate shaft 60. In this example, the radius of the third gear 53 is smaller than the radius of the main reduction gear 12 on the differential case 11 to achieve speed reduction.
The transmission 3 comprises a third gear set consisting of a fourth gear 54 and a fifth gear 55 which mesh with each other. The fourth gear 54 is arranged coaxially with the second gear 52 of the first gear set and thus also with the third gear 53 of the second gear set. More specifically, the fourth gear 54 is rotatably disposed on the first countershaft 60. The fifth gear 55 is arranged coaxially with the two output shafts 20 of the differential 10 and thus also with the hollow rotor shaft 40 of the electric machine 2. In this example, the fifth gear 55 may be rotatably provided on the support shaft 30 fixed to the differential case 11 through a bearing. However, the present invention is not limited thereto, and the fifth gear 55 may be coaxially disposed with the output shaft 20 of the differential 10 and rotatably supported by other means known to those skilled in the art. In this example, the radius of the fourth gear 54 is smaller than the radius of the fifth gear 55 to achieve deceleration.
The transmission 3 comprises a fourth set of gears consisting of a sixth gear 56 and a seventh gear 57 fixed on the same shaft. In this example, the sixth gear 56 and the seventh gear 57 are fixed for rotation with the rotatable second countershaft 70. As shown, the second intermediate shaft 70 may be rotatably supported by bearings. The sixth gear 56 meshes with the fifth gear 55 of the third gear set, and the seventh gear 57 meshes with the main reduction gear 12 on the differential case 11. In this example, the radius of the fifth gear 55 is smaller than the radius of the sixth gear 56, and the radius of the seventh gear 57 is smaller than the radius of the main reduction gear 12 on the differential case 11 to achieve speed reduction.
The transmission 3 further comprises a switching device 50, which switching device 50 is arranged coaxially with the second gear wheel 52 of the first gear set and is driven by this second gear wheel 52. In particular, the shifting device 50 may be a synchronizer that is fixed to the first countershaft 60 and therefore rotates with the first countershaft 60 and the second gear 52 of the first gear set. The switching device 50 can selectively engage the third gear 53 or said fourth gear 54, which are rotatably arranged on the first intermediate shaft 60, in order to rotate the third gear 53 or the fourth gear 54 synchronously with the second gear 52.
When the switching device 50 engages the third gear 53, as indicated by the arrow in fig. 2, power from the motor 2 is transmitted to the differential 10 through the first gear 51, the second gear 52, the third gear 53, and the main reduction gear 12 (first path) on the differential case 11, while the transmission mechanism 3 operates in the first gear. In the first gear, two-stage deceleration can be achieved.
When the switching device 50 engages the fourth gear 54, as shown by the arrow in fig. 3, power from the motor 2 is transmitted to the differential 10 through the first gear 51, the second gear 52, the fourth gear 54, the fifth gear 55, the sixth gear 56, the seventh gear 57, and the final reduction gear 12 (second path) on the differential case 11, while the transmission mechanism 3 operates in the second gear. In the second gear, four-stage deceleration can be achieved.
In the embodiment shown in fig. 1, the first gear 51, the second gear 52, the third gear 53, the final reduction gear 12, and the seventh gear 57 are disposed on one side in the axial direction of the differential 10, and the fourth gear 54, the fifth gear 55, and the sixth gear 56 are disposed on the other side in the axial direction of the differential 10. However, the present invention is not limited thereto, and the first gear 51, the second gear 52, the third gear 53, the main reduction gear 12, the fourth gear 54, the fifth gear 55, the sixth gear 56, and the seventh gear 57 may all be provided on the same side in the axial direction of the differential 10. For example, the fourth gear 54, the fifth gear 55, and the sixth gear 56 may be disposed on the same side of the differential 10 as the electric machine 2, such as between the first gear set and the differential 10.
Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (9)
1. A transmission for a motor vehicle, characterized in that it comprises:
the differential mechanism is provided with a differential mechanism shell, and a main reduction gear is arranged on the differential mechanism shell;
two output shafts extending from both sides of the differential, the two output shafts transmitting power to wheels of a vehicle, respectively;
a first gear set constituted by a first gear and a second gear that mesh with each other, the first gear being disposed coaxially with the two output shafts, power for driving a vehicle to travel being input to the first gear;
a second gear set composed of a third gear and the main reduction gear on the differential case, wherein the third gear is meshed with the second gear;
a third gear set composed of a fourth gear and a fifth gear which are engaged with each other, the fourth gear and the second gear being coaxially arranged, the fifth gear and the two output shafts being coaxially arranged;
a fourth gear set including a sixth gear and a seventh gear fixed on the same shaft, the sixth gear meshing with the fifth gear, the seventh gear meshing with the main reduction gear on the differential case; and
a switching device disposed coaxially with and driven by the second gear and selectively engageable with the third gear or the fourth gear.
2. The transmission mechanism according to claim 1, further comprising two hollow support shafts fixed to both sides of the differential case, the two hollow support shafts being disposed coaxially with the output shaft and rotatably supported by bearings.
3. The transmission mechanism as claimed in claim 2, characterized in that the first gear wheel of the first gear wheel set and the fifth gear wheel of the third gear wheel set are each rotatably arranged on a corresponding hollow shaft of the two hollow support shafts via a bearing.
4. The transmission mechanism as claimed in claim 1, wherein the switching means is a synchronizer.
5. The transmission mechanism according to claim 1, characterized in that the first gear, the second gear, the third gear, the final gear, and the seventh gear are provided on one side in an axial direction of the differential, and the fourth gear, the fifth gear, and the sixth gear are provided on the other side in the axial direction of the differential.
6. The transmission mechanism according to claim 1, characterized in that the first gear, the second gear, the third gear, the main reduction gear, the fourth gear, the fifth gear, the sixth gear, and the seventh gear are all disposed on the same side in the axial direction of the differential.
7. The transmission mechanism as claimed in claim 1, characterized in that the transmission mechanism further comprises a first intermediate shaft rotatably supported via a bearing and a second intermediate shaft rotatably supported via a bearing, the second gear of the first gear set and the switching device being fixed to the first intermediate shaft, the third gear of the second gear set and the fourth gear of the third gear set being rotatably disposed on the first intermediate shaft, the sixth gear and the seventh gear of the fourth gear set being fixed to the second intermediate shaft.
8. The transmission mechanism as claimed in claim 1, wherein the radius of the first gear is smaller than the radius of the second gear, the radius of the third gear is smaller than the radius of the main reduction gear, the radius of the fourth gear is smaller than the radius of the fifth gear, the radius of the fifth gear is smaller than the radius of the sixth gear, and the radius of the seventh gear is smaller than the radius of the main reduction gear.
9. A drive system for a motor vehicle, characterized in that the drive system comprises:
a motor having a hollow rotor shaft;
the transmission mechanism according to claim 1, wherein,
wherein the hollow rotor shaft of the motor is disposed coaxially with the two output shafts and is coupled to the first gear of the first gear set of the transmission mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022328714.9U CN213799264U (en) | 2020-10-19 | 2020-10-19 | Transmission mechanism and driving system for motor vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022328714.9U CN213799264U (en) | 2020-10-19 | 2020-10-19 | Transmission mechanism and driving system for motor vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213799264U true CN213799264U (en) | 2021-07-27 |
Family
ID=76959983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022328714.9U Expired - Fee Related CN213799264U (en) | 2020-10-19 | 2020-10-19 | Transmission mechanism and driving system for motor vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213799264U (en) |
-
2020
- 2020-10-19 CN CN202022328714.9U patent/CN213799264U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210727 |
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| CF01 | Termination of patent right due to non-payment of annual fee |