CN112810435A - Coaxial electric drive axle based on tower planet row - Google Patents
Coaxial electric drive axle based on tower planet row Download PDFInfo
- Publication number
- CN112810435A CN112810435A CN202010695024.9A CN202010695024A CN112810435A CN 112810435 A CN112810435 A CN 112810435A CN 202010695024 A CN202010695024 A CN 202010695024A CN 112810435 A CN112810435 A CN 112810435A
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- gear
- planet
- planetary gear
- tower
- electric drive
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- 230000007246 mechanism Effects 0.000 claims abstract description 84
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- 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
- B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
- B60K17/08—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing of mechanical type
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- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The embodiment of the invention discloses a coaxial electric drive axle based on a tower type planet row, which comprises a drive motor, a sun gear, a plurality of tower type planet gear mechanisms, a planet carrier, a gear ring, a differential mechanism and a shell, wherein a power output shaft of the drive motor is connected with the sun gear, the sun gear is externally meshed with a first planet gear in each tower type planet gear mechanism, a second planet gear in each tower type planet gear mechanism is internally meshed with the gear ring, the gear ring is fixedly arranged on the inner wall of the shell, the tower type planet gear mechanisms are arranged on the planet carrier, the planet carrier is connected with the differential mechanism, and the differential mechanism is connected with wheels, the coaxial electric drive axle based on the tower-type planet row can obtain a larger speed ratio and is smaller in size.
Description
Technical Field
The invention relates to the technical field of electric drive bridges, in particular to a coaxial electric drive bridge based on a tower-type planet row.
Background
Currently, more and more vehicles use a coaxial electric drive axle to achieve pure electric drive of the wheels.
In the prior art, a common planetary gear speed reducing mechanism is adopted for reducing speed, and the speed ratio which can be achieved by the common planetary gear speed reducing mechanism is small, so that the output speed ratio is small when the coaxial electric drive axle works. For different road conditions, the coaxial electric drive axle is required to output a larger speed ratio, and in order to output a larger speed ratio, the radial size of the coaxial electric drive axle needs to be enlarged, so that the coaxial electric drive axle has a larger volume, a larger weight and is excessively heavy.
Therefore, a coaxial electric drive axle with a smaller size and a larger speed ratio is needed.
Disclosure of Invention
The invention provides a coaxial electric drive axle based on a tower-type planet row, which can obtain a larger speed ratio and has a smaller volume. The specific technical scheme is as follows:
in a first aspect, the invention provides a tower planet row-based coaxial electric drive axle, which comprises a drive motor, a sun gear, a plurality of tower planet gear mechanisms, a planet carrier, a gear ring, a differential mechanism and a shell, wherein each tower planet gear mechanism comprises a first planet gear and a second planet gear, and the diameter of a reference circle of the first planet gear is larger than that of the second planet gear;
the sun gear, the planet carrier, the gear ring and the differential are coaxial, a first planetary gear and a second planetary gear in each tower type planetary gear mechanism are coaxial and fixedly connected, the axis of each tower type planetary gear mechanism is parallel to the axis of the sun gear, and the sun gear, the tower type planetary gear mechanisms, the planet carrier, the gear ring, the differential and the driving motor are all arranged in the shell;
the power output shaft of the driving motor is connected with the sun gear, the sun gear is externally meshed with a first planetary gear in each tower type planetary gear mechanism, a second planetary gear in each tower type planetary gear mechanism is internally meshed with the gear ring, the gear ring is fixedly installed on the inner wall of the shell, the tower type planetary gear mechanisms are installed on the planet carrier, the planet carrier is connected with the differential mechanism, and the differential mechanism is connected with wheels.
Optionally, the planet carrier comprises a plurality of first planet gear mounting shafts and a plurality of second planet gear mounting shafts;
an axis of each first planetary gear mounting shaft, an axis of each second planetary gear mounting shaft, and an axis of the sun gear are parallel to each other, the plurality of first planetary gears are respectively mounted to the plurality of first planetary gear shafts through needle bearings, and the plurality of second planetary gears are respectively mounted to the plurality of second planetary gear shafts through needle bearings, wherein the number of the first planetary gear shafts is the same as the number of the first planetary gears, and the number of the second planetary gear shafts is the same as the number of the second planetary gears.
Optionally, the first planet gear in each planetary gear mechanism is fixedly connected to the second planet gear by a spline.
Optionally, the number of the first planet gears and the number of the second planet gears are three.
Optionally, the sun gear and the power output shaft are integrally formed.
Optionally, the sun gear is splined to the power output shaft.
Optionally, the differential is connected to the wheels via a differential output shaft.
Alternatively, each first planet gear has the same number of teeth and module.
Alternatively, each of the second planet gears has the same number of teeth and module.
From the above, the coaxial electric drive axle based on the tower-type planet row provided by the embodiment of the invention comprises a drive motor, a sun gear, a plurality of tower-type planet gear mechanisms and a planet carrier, the planetary gear set comprises a gear ring, a differential mechanism and a shell, wherein a sun gear, a planet carrier, the gear ring and the differential mechanism are coaxial, a first planetary gear and a second planetary gear in each tower type planetary gear mechanism are coaxial and are fixedly connected with each other, the axis of each tower type planetary gear mechanism is parallel to the axis of the sun gear, a power output shaft of a driving motor is connected with the sun gear, the sun gear is externally meshed with the first planetary gear in each tower type planetary gear mechanism, the second planetary gear in each tower type planetary gear mechanism is internally meshed with the gear ring, the gear ring is fixedly installed on the inner wall of the shell, the tower type planetary gear mechanisms are installed on the planet carrier, the planet carrier is connected with the differential mechanism, and the differential mechanism is connected. Therefore, the coaxial electric drive axle based on the tower-type planet row provided by the embodiment of the invention is decelerated through the tower-type planet gear mechanism, and the tower-type planet gear mechanism has the advantages of small volume, light weight, compact structure and capability of achieving a larger speed ratio compared with a common planet gear deceleration mechanism, so that the coaxial electric drive axle based on the tower-type planet row provided by the embodiment of the invention can obtain a larger speed ratio and has a smaller volume. Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
The innovation points of the embodiment of the invention comprise:
1. the coaxial electric drive axle based on the tower-type planet row provided by the embodiment of the invention is decelerated through the tower-type planet gear mechanism, and the tower-type planet gear mechanism has the advantages of small volume, light weight, compact structure and capability of achieving a larger speed ratio compared with a common planet gear deceleration mechanism, so that the coaxial electric drive axle based on the tower-type planet row provided by the embodiment of the invention can obtain a larger speed ratio and has a smaller volume.
2. Because the coaxial electric drive axle based on the tower-type planet row can obtain a larger speed ratio, compared with a common planetary gear speed reducing mechanism, the range of the output speed ratio is enlarged, the range of the torque and the rotating speed which can be reached by a motor of the automobile can be relatively smaller, and the requirement on the motor is lower, therefore, the automobile can use the motor with lower standard, and the purpose of saving energy is achieved.
3. Compared with the common planetary gear speed reducing mechanism, the tower type planetary gear mechanism has smaller volume under the condition of reaching the same speed ratio.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary of some embodiments of the invention. For a person skilled in the art, without inventive effort, further figures can be obtained from these figures.
Fig. 1 is a schematic structural diagram of a coaxial electric drive axle based on a tower-type planet row according to an embodiment of the present invention.
In fig. 1, 1 drive motor, 2 sun gear, 3 planetary gear mechanism, 31 first planetary gear, 32 second planetary gear, 4 carrier, 5 ring gear, 6 differential, and 7 casing.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
It is to be noted that the terms "comprises" and "comprising" and any variations thereof in the embodiments and drawings of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The embodiment of the invention discloses a coaxial electric drive axle based on a tower-type planet row, which can obtain a larger speed ratio and has a smaller volume. The following provides a detailed description of embodiments of the invention.
Fig. 1 is a schematic structural diagram of a coaxial electric drive axle based on a tower-type planet row according to an embodiment of the present invention. Referring to fig. 1, the coaxial electric drive axle based on the tower-type planetary gear set provided by the embodiment of the invention comprises a drive motor 1, a sun gear 2, a plurality of tower-type planetary gear mechanisms 3, a planet carrier 4, a ring gear 5, a differential gear 6 and a shell 7, wherein each tower-type planetary gear mechanism 3 comprises a first planetary gear 31 and a second planetary gear 32, and the diameter of a reference circle of the first planetary gear 31 is larger than that of the second planetary gear 32.
The sun gear 2, the planet carrier 4, the ring gear 5 and the differential gear 6 are coaxial, the first planet gears 31 in each tower type planetary gear mechanism 3 are coaxial with the second planet gears 32 and are fixedly connected with the second planet gears 32, and the first planet gears 31 in each tower type planetary gear mechanism 3 are fixedly connected with the second planet gears 32 through splines.
The axis of each tower-type planetary gear mechanism 3 and the axis of the sun gear 2 are parallel to each other, and the sun gear 2, the plurality of tower-type planetary gear mechanisms 3, the planet carrier 4, the ring gear 5, the differential mechanism 6 and the drive motor 1 are all installed in the housing 7.
Since the first planetary gears 31 and the second planetary gears 32 are coaxial and the first planetary gears 31 and the second planetary gears 32 are fixedly connected to form the planetary gear mechanisms 3, the axis of each planetary gear mechanism 3 and the axis of the sun gear 2 are parallel to each other, that is, the axis of the first planetary gear 31, the axis of the second planetary gear 32 and the axis of the sun gear 2 in each planetary gear mechanism 3 are parallel to each other.
Illustratively, the number of the first planet gears 31 and the number of the second planet gears 32 are three, each first planet gear 31 has the same number of teeth and module, and each second planet gear 32 has the same number of teeth and module.
The sun gear 2 is used as a power input end and is rigidly connected with a power output shaft of the driving motor 1, namely, the power output shaft of the driving motor 1 is connected with the sun gear 2.
There are various ways for rigidly connecting the power output shaft to the sun gear 2, including but not limited to the following two:
the first method comprises the following steps:
the power output shaft is connected with the spline of the sun wheel 2.
And the second method comprises the following steps:
the sun gear 2 may be formed integrally with the power take-off shaft.
With continued reference to fig. 1, the sun gear 2 is in external engagement with the first planetary gears 31 in each of the planetary gear mechanisms 3, the second planetary gears 32 in each of the planetary gear mechanisms 3 are in internal engagement with the ring gear 5, and the ring gear 5 is fixedly mounted to the inner wall of the housing 7.
The plurality of tower-type planetary gear mechanisms 3 are mounted to the carrier 4, the carrier 4 includes a plurality of first planetary gear mounting shafts and a plurality of second planetary gear mounting shafts, an axis of each first planetary gear mounting shaft and an axis of each second planetary gear mounting shaft are parallel to an axis of the sun gear 2, the plurality of first planetary gears 31 are respectively mounted to a plurality of first planetary gear shafts through needle bearings, and the plurality of second planetary gears 32 are respectively mounted to a plurality of second planetary gear shafts through needle bearings, wherein the number of the first planetary gear shafts is the same as the number of the first planetary gears 31, and the number of the second planetary gear shafts is the same as the number of the second planetary gears 32.
With continued reference to fig. 1, the planet carrier 4 is coupled to a differential 6, the differential 6 being coupled to the wheels, and the differential 6 being coupled to the wheels, illustratively, via a differential output shaft.
When the planetary gear set works, power is transmitted to the sun gear 2 from a power output shaft of the driving motor 1, the sun gear 2 rotates to drive each tower-type planetary gear mechanism 3 to revolve around the axis of the sun gear 2 and rotate, the power is transmitted to each tower-type planetary gear mechanism 3 from the sun gear 2 and then transmitted to the planetary carrier 4 through each tower-type planetary gear mechanism 3, and the planetary carrier 4 is connected with the differential mechanism 6, so that the power is transmitted to the differential mechanism 6 through the planetary carrier 4 and then transmitted to wheels through the differential mechanism 6.
As can be seen from the above, a coaxial electric drive axle based on a tower-type planetary gear set provided by the embodiment of the present invention includes a drive motor 1, a sun gear 2, a plurality of tower-type planetary gear mechanisms 3, a carrier 4, a ring gear 5, a differential gear 6 and a housing 7, the sun gear 2, the carrier 4, the ring gear 5 and the differential gear 6 are coaxial, a first planetary gear 31 and a second planetary gear 32 in each tower-type planetary gear mechanism 3 are coaxial and fixedly connected, an axis of each tower-type planetary gear mechanism 3 is parallel to an axis of the sun gear 2, a power output shaft of the drive motor 1 is connected with the sun gear 2, the sun gear 2 is externally engaged with the first planetary gear 31 in each tower-type planetary gear mechanism 3, the second planetary gear 32 in each tower-type planetary gear mechanism 3 is parallel to the ring gear 5, the ring gear 5 is fixedly mounted on an inner wall of the housing 7, the plurality of tower-type planetary gear mechanisms 3 are mounted in the, the planet carrier 4 is connected with a differential 6, and the differential 6 is connected with wheels. Therefore, the coaxial electric drive axle based on the tower-type planet row provided by the embodiment of the invention is decelerated through the tower-type planet gear mechanism 3, and the tower-type planet gear mechanism 3 has the advantages of small volume, light weight, compact structure and capability of achieving a larger speed ratio compared with a common planet gear deceleration mechanism, so that the coaxial electric drive axle based on the tower-type planet row provided by the embodiment of the invention can obtain a larger speed ratio and has a smaller volume.
Meanwhile, the coaxial electric drive axle based on the tower-type planet row can obtain a larger speed ratio, compared with a common planetary gear speed reducing mechanism, the range of the output speed ratio is enlarged, the range of the torque and the rotating speed which can be reached by a motor of the automobile can be relatively smaller, and the requirement on the motor is lower, so that the automobile can use the motor with lower standard, and the purpose of saving energy is achieved.
Meanwhile, compared with a common planetary gear speed reducing mechanism, the tower type planetary gear mechanism 3 is smaller in size under the condition that the same speed ratio is achieved.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
Those of ordinary skill in the art will understand that: modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be located in one or more devices different from the embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A coaxial electric drive axle based on a tower-type planet row is characterized by comprising a drive motor, a sun gear, a plurality of tower-type planet gear mechanisms, a planet carrier, a gear ring, a differential mechanism and a shell, wherein each tower-type planet gear mechanism comprises a first planet gear and a second planet gear, and the pitch circle diameter of the first planet gear is larger than that of the second planet gear;
the sun gear, the planet carrier, the gear ring and the differential are coaxial, a first planetary gear and a second planetary gear in each tower type planetary gear mechanism are coaxial and fixedly connected, the axis of each tower type planetary gear mechanism is parallel to the axis of the sun gear, and the sun gear, the tower type planetary gear mechanisms, the planet carrier, the gear ring, the differential and the driving motor are all arranged in the shell;
the power output shaft of the driving motor is connected with the sun gear, the sun gear is externally meshed with a first planetary gear in each tower type planetary gear mechanism, a second planetary gear in each tower type planetary gear mechanism is internally meshed with the gear ring, the gear ring is fixedly installed on the inner wall of the shell, the tower type planetary gear mechanisms are installed on the planet carrier, the planet carrier is connected with the differential mechanism, and the differential mechanism is connected with wheels.
2. The coaxial electric drive axle of claim 1, wherein the planet carrier comprises a plurality of first planet mounting shafts and a plurality of second planet mounting shafts;
an axis of each first planetary gear mounting shaft, an axis of each second planetary gear mounting shaft, and an axis of the sun gear are parallel to each other, the plurality of first planetary gears are respectively mounted to the plurality of first planetary gear shafts through needle bearings, and the plurality of second planetary gears are respectively mounted to the plurality of second planetary gear shafts through needle bearings, wherein the number of the first planetary gear shafts is the same as the number of the first planetary gears, and the number of the second planetary gear shafts is the same as the number of the second planetary gears.
3. The coaxial electric drive axle of claim 1, wherein the first planet gear of each planetary gear mechanism is fixedly connected to the second planet gear by splines.
4. The coaxial electric drive axle of claim 1, wherein the number of first planet gears and the number of second planet gears are each three.
5. The coaxial electric drive axle of claim 1, wherein the sun gear is integrally formed with the power take-off shaft.
6. The coaxial electric transaxle of claim 1 wherein the sun gear is splined to the power output shaft.
7. The coaxial electric drive axle of claim 1, wherein the differential is connected to the wheels through a differential output shaft.
8. The coaxial electric drive axle of claim 1, wherein each first planetary gear has the same number of teeth and module.
9. The coaxial electric drive axle of claim 1, wherein each of the second planet gears has the same number of teeth and module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010695024.9A CN112810435A (en) | 2020-07-19 | 2020-07-19 | Coaxial electric drive axle based on tower planet row |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010695024.9A CN112810435A (en) | 2020-07-19 | 2020-07-19 | Coaxial electric drive axle based on tower planet row |
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| Publication Number | Publication Date |
|---|---|
| CN112810435A true CN112810435A (en) | 2021-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010695024.9A Pending CN112810435A (en) | 2020-07-19 | 2020-07-19 | Coaxial electric drive axle based on tower planet row |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109130839A (en) * | 2018-10-09 | 2019-01-04 | 清华大学 | A kind of electronic wheel assembly, vehicle bridge and vehicle suitable for twin tyre wheel |
| WO2020001589A1 (en) * | 2018-06-29 | 2020-01-02 | 比亚迪股份有限公司 | Transmission, power drive system and vehicle |
| CN111376715A (en) * | 2018-12-29 | 2020-07-07 | 比亚迪股份有限公司 | Electrically-driven speed reducer, electrically-driven axle power assembly and vehicle |
| CN111439116A (en) * | 2020-05-06 | 2020-07-24 | 常州易控汽车电子股份有限公司 | Coaxial two-gear planetary row electric drive axle for automobile |
| CN212555833U (en) * | 2020-07-19 | 2021-02-19 | 清研华科新能源研究院(南京)有限公司 | Coaxial electric drive axle based on tower planet row |
-
2020
- 2020-07-19 CN CN202010695024.9A patent/CN112810435A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020001589A1 (en) * | 2018-06-29 | 2020-01-02 | 比亚迪股份有限公司 | Transmission, power drive system and vehicle |
| CN109130839A (en) * | 2018-10-09 | 2019-01-04 | 清华大学 | A kind of electronic wheel assembly, vehicle bridge and vehicle suitable for twin tyre wheel |
| CN111376715A (en) * | 2018-12-29 | 2020-07-07 | 比亚迪股份有限公司 | Electrically-driven speed reducer, electrically-driven axle power assembly and vehicle |
| CN111439116A (en) * | 2020-05-06 | 2020-07-24 | 常州易控汽车电子股份有限公司 | Coaxial two-gear planetary row electric drive axle for automobile |
| CN212555833U (en) * | 2020-07-19 | 2021-02-19 | 清研华科新能源研究院(南京)有限公司 | Coaxial electric drive axle based on tower planet row |
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