CN112253718A - Electric automobile speed reduction differential mechanism - Google Patents
Electric automobile speed reduction differential mechanism Download PDFInfo
- Publication number
- CN112253718A CN112253718A CN202010038898.7A CN202010038898A CN112253718A CN 112253718 A CN112253718 A CN 112253718A CN 202010038898 A CN202010038898 A CN 202010038898A CN 112253718 A CN112253718 A CN 112253718A
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- China
- Prior art keywords
- gear set
- reduction gear
- reduction
- speed
- differential
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- 230000009467 reduction Effects 0.000 title claims abstract description 67
- 230000007246 mechanism Effects 0.000 title claims abstract description 8
- 230000005540 biological transmission Effects 0.000 description 10
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
- F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
- F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
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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)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a speed reduction differential mechanism of an electric automobile, and belongs to the technical field of electric automobiles. The invention comprises a reduction gear set, a planetary gear set and a differential mechanism, wherein the reduction gear set comprises a reduction gear set A and a reduction gear set B, the planetary gear set is arranged on the left side of the reduction gear set A and is connected with the reduction gear set A through a rotating shaft, a hydraulic clutch is arranged at the joint of the planetary gear set and the reduction gear set A, and the right side of the reduction gear set A is connected with the reduction gear set B through the rotating shaft.
Description
Technical Field
The invention relates to a speed reduction differential mechanism of an electric automobile, and belongs to the technical field of electric automobiles.
Background
At present, the mainstream pure electric vehicles in the world all adopt a structure that a motor is matched with a single-stage reduction differential, and the rotating speed of wheels is controlled by an electric control system such as a driving frequency converter on the basis of a fixed reduction ratio, so that the structure is relatively simple.
In order to obtain larger torque when starting, a common electric vehicle needs a larger reduction ratio so as to amplify the torque output by a motor to drive the vehicle, and the reduction ratio of a fixed gear ratio speed reducer is generally between 8 and 10, but the larger reduction ratio simultaneously means that higher wheel speed cannot be obtained through the speed reducer when accelerating, so the highest vehicle speed is not too high.
In China, most of electric automobile manufacturers use permanent magnet motors, the power of the permanent magnet motors is smaller than that of alternating current asynchronous motors, the maximum torque is restricted by demagnetization of permanent magnets, the high rotating speed is limited, the permanent magnet motors are only suitable for running at medium and low rotating speeds, the maximum speed per hour of an electric automobile is about 80Km/h, and the speed is only suitable for urban road sections and other low-speed road sections. If the electric vehicle runs on a highway, the permanent magnet motor is forced to run at a high rotating speed by the reducer with a fixed gear ratio, the torque and the efficiency of the motor are reduced, the endurance mileage of the electric vehicle is shortened, and the driving insecurity is greatly increased. The motor is easy to cause high temperature when running at high rotating speed, so that the permanent magnet is invalid, and the service life of the motor is shortened. The disadvantages of these single reduction gears greatly limit the functionality of the electric vehicle.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a reduction differential for an electric vehicle, which is used to solve the problems that in the prior art, a speed reducer with a fixed gear ratio forces a permanent magnet motor to operate at a high rotation speed, the torque and efficiency of the motor are reduced, the driving range of the electric vehicle is shortened, and the driving insecurity is greatly increased.
To achieve the above and other related objects, the present invention provides a reduction differential for an electric vehicle, comprising: reduction gear set, planetary gear set and differential mechanism, reduction gear set include reduction gear set A and reduction gear set B, planetary gear set up in reduction gear set A left side, be connected with reduction gear set A through the rotation axis, planetary gear set and reduction gear set A junction are provided with hydraulic clutch, reduction gear set A right side is through rotation axis connection reduction gear set B.
In an embodiment of the present invention, the left side of the planetary gear set is connected to a driving motor through a rotating shaft.
In an embodiment of the present invention, the reduction gear set B is connected to a differential.
As described above, the electric vehicle reduction differential according to the present invention has the following beneficial effects:
the low-gear speed reducer of the automatic transmission is large in speed reduction, large in torque during starting and short in hundred kilometers per hour; the high-grade speed reduction is small, after the vehicle speed comes, the large torque of the motor can be continuously maintained through gear-up, the vehicle speed is continuously improved, the automatic transmission can automatically regulate the speed through monitoring the rotating speed of the motor, the motor can work in a high-efficiency rotating speed range as much as possible, the effects of reducing loss, improving the endurance mileage and the like are achieved, the same motor can continuously run at a high speed by carrying the automatic transmission, the driving safety is guaranteed, and the daily requirement of a driver is met.
Drawings
Fig. 1 is a schematic view of an overall structure of a reduction differential of an electric vehicle according to an embodiment of the invention.
Wherein, 1, driving a motor; 2. a planetary gear set; 3. hydraulic clutch; 4. a reduction gear set A; 5. a reduction gear set B; 6. a differential gear.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Referring to fig. 1, the present invention provides a reduction differential for an electric vehicle, including: reduction gear set, planetary gear set 2 and differential 6, reduction gear set include reduction gear set A4 and reduction gear set B5, planetary gear set 2 set up on reduction gear set A4 left side, be connected with reduction gear set A4 through the rotation axis, planetary gear set 2 is provided with hydraulic clutch 3 with reduction gear set A4 junction, reduction gear set A4 right side is through rotation axis connection reduction gear set B5.
An application method of a reduction differential of an electric automobile comprises the following steps: when the electric automobile starts or is in a low-speed state, a large reduction ratio is needed to increase wheel torque, at the moment, the control system drives the hydraulic clutch 3 to separate the sun gear from the transmission gear, the planetary gear set 2 is connected with the transmission gear, the speed is reduced twice through the reduction gear set, and finally power is distributed to two wheels through the differential 6; when the automobile reaches a certain speed and further speed increase is needed, the control system drives the hydraulic clutch 3 to separate the planetary gear set 2 from the transmission gear, the planetary gear set 2 is in an idle running state, the sun gear is connected with the transmission gear, the speed is reduced twice through the reduction gear set, and finally power is distributed to two wheels through the differential mechanism 6.
The left side of the planetary gear set 2 is connected with a driving motor 1 through a rotating shaft. The reduction gear set B5 is connected with the differential 6.
In conclusion, the low-gear speed reduction ratio of the automatic transmission is large, the torque is larger during starting, and the time of hundreds of kilometers per hour is shorter; the high-grade speed reduction is small, after the vehicle speed comes, the large torque of the motor can be continuously maintained through gear-up, the vehicle speed is continuously improved, the automatic transmission can automatically regulate the speed through monitoring the rotating speed of the motor, the motor can work in a high-efficiency rotating speed range as much as possible, the effects of reducing loss, improving the endurance mileage and the like are achieved, the same motor can continuously run at a high speed by carrying the automatic transmission, the driving safety is guaranteed, and the daily requirement of a driver is met. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (3)
1. An electric vehicle reduction differential, comprising: reduction gear set, planetary gear set (2) and differential mechanism (6), reduction gear set include reduction gear set A (4) and reduction gear set B (5), planetary gear set (2) set up in reduction gear set A (4) left side, be connected with reduction gear set A (4) through the rotation axis, planetary gear set (2) are provided with hydraulic clutch (3) with reduction gear set A (4) junction, reduction gear set A (4) right side is through rotation axis connection reduction gear set B (5).
2. The electric vehicle reduction differential according to claim 1, wherein: the left side of the planetary gear set (2) is connected with a driving motor (1) through a rotating shaft.
3. The electric vehicle reduction differential according to claim 1, wherein: the reduction gear set B (5) is connected with a differential (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010038898.7A CN112253718A (en) | 2020-01-14 | 2020-01-14 | Electric automobile speed reduction differential mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010038898.7A CN112253718A (en) | 2020-01-14 | 2020-01-14 | Electric automobile speed reduction differential mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112253718A true CN112253718A (en) | 2021-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010038898.7A Pending CN112253718A (en) | 2020-01-14 | 2020-01-14 | Electric automobile speed reduction differential mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112253718A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070259747A1 (en) * | 2006-05-05 | 2007-11-08 | Thomas Steven G | Speed reduction gear train with planetary differential for electric motor axle drive |
| CN202707955U (en) * | 2012-06-28 | 2013-01-30 | 湖南江麓容大车辆传动股份有限公司 | Electromobile, variable speed gear and variable speed gear control system |
| CN104276033A (en) * | 2013-07-05 | 2015-01-14 | 湖南大学 | Electric automobile transmission and speed change method |
| CN205905780U (en) * | 2016-08-29 | 2017-01-25 | 长城汽车股份有限公司 | New energy automobile and transmission system and power assembly thereof |
| US20180099561A1 (en) * | 2016-10-10 | 2018-04-12 | Nio Nextev Limited | Power coupling system for electric vehicle, electric vehicle having the same and control method thereof |
| CN108045223A (en) * | 2018-01-15 | 2018-05-18 | 北京博格华纳汽车传动器有限公司 | A kind of new-energy automobile deceleration device |
-
2020
- 2020-01-14 CN CN202010038898.7A patent/CN112253718A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070259747A1 (en) * | 2006-05-05 | 2007-11-08 | Thomas Steven G | Speed reduction gear train with planetary differential for electric motor axle drive |
| CN202707955U (en) * | 2012-06-28 | 2013-01-30 | 湖南江麓容大车辆传动股份有限公司 | Electromobile, variable speed gear and variable speed gear control system |
| CN104276033A (en) * | 2013-07-05 | 2015-01-14 | 湖南大学 | Electric automobile transmission and speed change method |
| CN205905780U (en) * | 2016-08-29 | 2017-01-25 | 长城汽车股份有限公司 | New energy automobile and transmission system and power assembly thereof |
| US20180099561A1 (en) * | 2016-10-10 | 2018-04-12 | Nio Nextev Limited | Power coupling system for electric vehicle, electric vehicle having the same and control method thereof |
| CN108045223A (en) * | 2018-01-15 | 2018-05-18 | 北京博格华纳汽车传动器有限公司 | A kind of new-energy automobile deceleration device |
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Application publication date: 20210122 |