CN112046276A - Motor-driven coaxial axle - Google Patents
Motor-driven coaxial axle Download PDFInfo
- Publication number
- CN112046276A CN112046276A CN202011028442.9A CN202011028442A CN112046276A CN 112046276 A CN112046276 A CN 112046276A CN 202011028442 A CN202011028442 A CN 202011028442A CN 112046276 A CN112046276 A CN 112046276A
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- CN
- China
- Prior art keywords
- gear
- motor
- rotor
- sun gear
- differential
- 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.)
- Pending
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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
- B60K1/00—Arrangement or mounting of electrical propulsion units
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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
- B60K17/165—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing provided between independent half axles
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Retarders (AREA)
Abstract
The patent provides a coaxial drive axle, and its simple structure is reliable, and axial dimension is short, specially adapted to the higher occasion of axial dimension requirement. The planetary gear speed reducer comprises a motor, a planetary gear speed reducer, a differential, a first sun gear fixed on a shell and a second sun gear rotating relative to the shell, wherein the first sun gear and the second sun gear are coaxial; each group of planet wheels comprises two planet wheels which are coaxially and fixedly connected and are respectively meshed with the two sun wheels; in the axial direction of the motor, the rotor is positioned on one side of the planet wheel; the planet carrier is provided with an extension ring extending to one side of the rotor along the axial direction of the motor, and the rotor is fixed on the extension ring; the differential shell is positioned in the rotor and fixed with the second sun gear, the two half shafts extend into the differential shell and are fixed with the half shaft gears, the differential central gear which is simultaneously meshed with the two half shaft gears is rotatably arranged on the central gear shaft, and the central gear shaft is fixed in the differential shell.
Description
Technical Field
This patent relates to motor drive's axle structure.
Background
With the popularization of electric vehicles, the driving parts of the electric vehicles are used more and more, and the integration level is continuously improved to reduce the cost and improve the reliability. The conventional axle uses a motor and a gear reducer, a rotor shaft of the motor and an output shaft of the gear reducer are not coaxial and are arranged along the radial direction of a gear, a driving part has large volume, heavy weight and high cost, and the performance of a vehicle is influenced, so that a coaxial driving axle (coaxial axle) with high integration level is required. The coaxial bridge has the characteristics of compact structure, small volume, light weight and the like, and the axes of the motor, the speed reducer and the wheels are superposed. Conventional coaxial axles use an intermediate gear that is not coaxial with the wheel and therefore still bulky.
Disclosure of Invention
The utility model aims at providing a coaxial drive axle, its simple structure is reliable, and axial dimension is short, specially adapted to the higher occasion of axial dimension requirement, and its compact structure, small light in weight has great drive ratio, and the transmission link is few (only has two-stage gear engagement), and transmission efficiency is high, and is with low costs.
In order to achieve the above object, the motor-driven coaxial axle described in this patent has a housing, a stator fixed to the housing, a rotor, a sun gear, a planetary gear, and a planetary carrier rotatably disposed on the housing, the rotor and the stator constituting a motor, the sun gear, the planetary gear, and the planetary carrier constituting a planetary gear reducer, a differential mechanism composed of a differential housing, a side gear, a sun gear shaft, and a sun gear, and having two sun gears whose axes coincide with each other, i.e., a first sun gear fixed to the housing and a second sun gear rotating relative to the housing; the planetary gears are at least one group, each group of planetary gears comprises a first planetary gear and a second planetary gear which are respectively meshed with the first sun gear and the second sun gear, and the first planetary gear and the second planetary gear are coaxially fixed and rotatably arranged on the planetary carrier; the axis of a motor for rotating the rotor, the axis of the second sun gear, the axis of the planet carrier and the axes of the two half shafts of the differential are coaxial; in the axial direction of the motor, the rotor is positioned on one side of the planet wheel; the planet carrier is provided with an extension ring extending to one side of the rotor along the axial direction of the motor, and the rotor is fixed on the extension ring; the differential shell is positioned in the rotor and fixed with the second sun gear, one of the two half shafts penetrates through the center of the second sun gear and extends into the differential shell to be fixed with one half shaft gear, the other half shaft penetrates through the shell and extends into the differential shell to be fixed with the other half shaft gear, the differential central gear which is simultaneously meshed with the two half shaft gears is rotatably arranged on the central gear shaft, and the central gear shaft is fixed in the differential shell.
The coaxial axle of claim 1, wherein: the first planet wheel and the second planet wheel are combined into a whole, and the whole gear is formed.
The above-mentioned coaxial axle, the first planet wheel and the second planet wheel are two gears having different gear parameters.
The planetary wheel sets of the coaxial axle are uniformly distributed on the same circumference.
In the coaxial axle, the motor is an inner rotor motor, and the stator is positioned at the peripheral part of the rotor.
In the coaxial axle, the motor is an outer rotor motor, and the rotor is positioned at the peripheral part of the stator.
In the coaxial axle, the motor is a disc motor, and the stator is positioned on one side of the rotor in the axial direction of the motor.
The beneficial effect of this patent: in this patent, the differential is located in the rotor of the motor, the reducer is composed of two sun gears and a planet carrier and at least one planetary gear set, the planet carrier has an extension ring extending axially along the motor, and the motor rotor is mounted on the extension ring of the planet carrier. The extension ring may be considered to be part of the planet carrier. Because the rotor is directly fixed on the planet carrier, the structure is simple and reliable, the axial size is short, and the planetary gear set is particularly suitable for occasions with higher requirements on the axial size.
The first sun gear far away from the motor is fixed (fixedly connected to the shell), the second sun gear close to the motor rotor is an output gear of the speed reducer, and the differential shell is fixedly connected to the output gear of the speed reducer (or integrally). The rotor of the motor is fixed on the (extending ring of the) planet carrier, and the stator of the motor is fixed on the shell.
The speed reducer in the structure has compact structure, can realize large transmission ratio transmission, has few transmission links (only two-stage gear engagement), high transmission efficiency and low cost, has small volume and light weight compared with the traditional parallel shaft gear speed reducer, and has low cost and small process difficulty compared with a planetary gear train speed reducer consisting of a sun gear, a planet gear and an inner gear ring because the inner gear ring is not used.
Drawings
FIG. 1 is a schematic view of an axially aligned coaxially driven axle.
In the figure, a housing 100, a motor 1, a stator 11, a rotor 12,
a speed reducer 2, a first sun gear 21, a second sun gear 22, a first planet gear 23, a second planet gear 24, a planet carrier 25, a planet gear shaft 26, an extension ring 27,
Detailed Description
Referring to fig. 1, the motor-driven coaxial axle includes a motor 1 mainly composed of a housing 100, a stator 11 fixed on the housing, and a rotor 12, a planetary gear reducer 2 mainly composed of a first sun gear 21, a second sun gear 22, a first planetary gear 23, a second planetary gear 24, and a planetary carrier 25, and a differential 3 mainly composed of a first half shaft 31, a second half shaft 32, a first half shaft gear 33, a second half shaft gear 34, a differential housing 35, a sun gear 36, and a sun gear shaft 37. The housing 100 is common to the motor and the reducer, and can also be considered as a component of the reducer.
The first planet wheel 23 and the second planet wheel 24 are respectively meshed with the first sun wheel 21 and the second sun wheel 22, are coaxially fixed and are rotatably arranged on a planet wheel shaft 26 through bearings to form a planet wheel set. The planetary gear shaft 26 is fixed to the carrier 25. The first sun gear 21 fixed to the housing 100 and the second sun gear 22 rotated relative to the housing by a bearing are axially overlapped.
The axis of the rotor rotation is the motor axis, and the motor axis, the second sun gear axis, the axis of the planet carrier rotation and the axes of the two half shafts of the differential mechanism are all coaxial. In the motor axial direction, the rotor 12 and the differential housing 35 are located on the same side of the planet wheels. The carrier 25 has an extension ring 27 extending toward the rotor side in the motor axial direction, and the extension ring 27 may be regarded as a part of the carrier 25. The rotor 12 is connected to an extension ring 27. The differential housing 35 is located inside the rotor 12 and the extension ring 27 in a direction perpendicular to the motor axis. The side of the differential housing 35 is fixedly connected to the second sun gear 22.
The first half shaft 31 extends into the differential case 35 through the center of the axis of the second sun gear 22 and is fixed to the first half shaft gear 33, the second half shaft 32 extends into the differential case 35 through the case 100 and is fixed to the second half shaft gear 34, the differential sun gear 36 which meshes with both the first half shaft gear 33 and the second half shaft gear 34 is rotatably provided on the sun gear shaft 37, and the sun gear shaft 37 is fixed to the differential case 35.
The coaxial axle, the first planet wheel 23 and the second planet wheel 24 can be an integral gear which is combined into a whole, or can be two gears with different gear parameters. The planetary wheel set can have a plurality of groups, and each group of planetary wheel set is uniformly distributed on the same circumference.
The stator 11 in the motor 1 is located at the outer peripheral portion of the rotor 12, and the motor 1 is an inner rotor motor. Of course, the motor may be a disk motor in which the stator is located on the rotor side in the motor axial direction, an outer rotor motor in which the rotor is located on the outer peripheral portion of the stator, or a motor of another kind and structure.
The extension ring 27 (or the planet carrier 25) is rotatably mounted on the housing 100 via a bearing, and when the rotor 12 rotates, the extension ring and the planet carrier 25 rotate together around the motor axis. Since the first sun gear 21 is fixed to the housing 100 and cannot rotate, the first planet gear 23 rotates around the planet gear shaft 26, and since the second planet gear 24 is fixed coaxially with the first planet gear 23, the second planet gear 24 also rotates synchronously with the first planet gear 23, the second sun gear 22 meshed with the second planet gear 24 rotates, the differential housing 35 fixedly connected with the second sun gear 22 rotates, and the first half shaft 31 and the second half shaft 32 are driven to rotate synchronously through the central gear 36. If the first axle shaft 31 and the second axle shaft 32 rotate at different speeds, the sun gear 36 rotates relative to the sun gear shaft 37.
The type and the structural form of the motor and the structure of the differential do not affect the protection scope of the claims of the patent;
the number of the planetary wheel sets of the reducer is at least one set, and can also be multiple sets, which does not affect the protection scope of the claims of the patent;
the positioning structure of the two sun gears does not affect the protection scope of the claims of the patent.
Claims (7)
1. Motor drive's coaxial axle has the casing, fixes stator, rotor, sun gear, planet wheel on the casing, rotates the planet carrier that sets up on the casing, and the motor is constituteed to rotor and stator, and sun gear, planet wheel and planet carrier constitute planetary gear reducer, the differential mechanism of constituteing by differential mechanism shell, half axle gear, sun gear axle, sun gear, characterized by: the sun gear comprises two sun gears with coincident axes, namely a first sun gear fixed on the shell and a second sun gear rotating relative to the shell; the planetary gears are at least one group, each group of planetary gears comprises a first planetary gear and a second planetary gear which are respectively meshed with the first sun gear and the second sun gear, and the first planetary gear and the second planetary gear are coaxially fixed and rotatably arranged on the planetary carrier; the axis of a motor for rotating the rotor, the axis of the second sun gear, the axis of the planet carrier and the axes of the two half shafts of the differential are coaxial; in the axial direction of a motor, the rotor and the differential shell are both positioned on the same side of the planet wheel; the planet carrier is provided with an extension ring extending to one side of the rotor along the axial direction of the motor, and the rotor is fixed on the extension ring; the differential shell is positioned in the rotor and fixed with the second sun gear, one of the two half shafts penetrates through the center of the second sun gear and extends into the differential shell to be fixed with one half shaft gear, the other half shaft penetrates through the shell and extends into the differential shell to be fixed with the other half shaft gear, the differential central gear which is simultaneously meshed with the two half shaft gears is rotatably arranged on the central gear shaft, and the central gear shaft is fixed in the differential shell.
2. The coaxial axle of claim 1, wherein: the first planet wheel and the second planet wheel are combined into a whole, and the whole gear is formed.
3. The coaxial axle of claim 1, wherein: the first planet gear and the second planet gear are two gears having different gear parameters.
4. The coaxial axle of claim 1, wherein: the planetary wheel sets are provided with a plurality of groups, and the planetary wheel sets of each group are uniformly distributed on the same circumference.
5. The coaxial axle of claim 1, wherein: the motor is an inner rotor motor, and the stator is positioned on the periphery of the rotor.
6. The coaxial axle of claim 1, wherein: the motor is an outer rotor motor, and the rotor is positioned on the periphery of the stator.
7. The coaxial axle of claim 1, wherein: the motor is a disc motor, and the stator is positioned on one side of the rotor in the axial direction of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011028442.9A CN112046276A (en) | 2020-09-26 | 2020-09-26 | Motor-driven coaxial axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011028442.9A CN112046276A (en) | 2020-09-26 | 2020-09-26 | Motor-driven coaxial axle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112046276A true CN112046276A (en) | 2020-12-08 |
Family
ID=73604948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011028442.9A Pending CN112046276A (en) | 2020-09-26 | 2020-09-26 | Motor-driven coaxial axle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112046276A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112833146A (en) * | 2021-03-08 | 2021-05-25 | 南京好龙电子有限公司 | External meshing planetary gear mechanism with high transmission efficiency |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19538865A1 (en) * | 1995-10-19 | 1997-04-24 | Teves Gmbh Alfred | Transmission gear with electric drive motor e.g. for automotive vehicle |
| JP2002104001A (en) * | 2000-09-29 | 2002-04-09 | Exedy Corp | Reduction gear of electric vehicle and its reduction ratio setting method |
| CN101052824A (en) * | 2005-06-20 | 2007-10-10 | 太能俊 | Lever type gear reducer |
| CN203142396U (en) * | 2013-02-28 | 2013-08-21 | 长城汽车股份有限公司 | Electric drive assembly of vehicle |
| CN208576429U (en) * | 2018-07-09 | 2019-03-05 | 陕西汉德车桥有限公司 | A kind of central motor deceleration drive axle and the vehicle equipped with the drive axle |
| CN110154745A (en) * | 2019-04-08 | 2019-08-23 | 浙江万里扬新能源驱动科技有限公司 | A kind of two-in-one power assembly of new-energy automobile |
| CN111434950A (en) * | 2019-01-14 | 2020-07-21 | 罗灿 | Double-sun-wheel planet row speed reducer capable of reducing abrasion and prime numbers |
-
2020
- 2020-09-26 CN CN202011028442.9A patent/CN112046276A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19538865A1 (en) * | 1995-10-19 | 1997-04-24 | Teves Gmbh Alfred | Transmission gear with electric drive motor e.g. for automotive vehicle |
| JP2002104001A (en) * | 2000-09-29 | 2002-04-09 | Exedy Corp | Reduction gear of electric vehicle and its reduction ratio setting method |
| CN101052824A (en) * | 2005-06-20 | 2007-10-10 | 太能俊 | Lever type gear reducer |
| CN203142396U (en) * | 2013-02-28 | 2013-08-21 | 长城汽车股份有限公司 | Electric drive assembly of vehicle |
| CN208576429U (en) * | 2018-07-09 | 2019-03-05 | 陕西汉德车桥有限公司 | A kind of central motor deceleration drive axle and the vehicle equipped with the drive axle |
| CN111434950A (en) * | 2019-01-14 | 2020-07-21 | 罗灿 | Double-sun-wheel planet row speed reducer capable of reducing abrasion and prime numbers |
| CN110154745A (en) * | 2019-04-08 | 2019-08-23 | 浙江万里扬新能源驱动科技有限公司 | A kind of two-in-one power assembly of new-energy automobile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112833146A (en) * | 2021-03-08 | 2021-05-25 | 南京好龙电子有限公司 | External meshing planetary gear mechanism with high transmission efficiency |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201208 |