CN114425943A - Off-gear type wheel-side electric driving system structure - Google Patents
Off-gear type wheel-side electric driving system structure Download PDFInfo
- Publication number
- CN114425943A CN114425943A CN202011174328.7A CN202011174328A CN114425943A CN 114425943 A CN114425943 A CN 114425943A CN 202011174328 A CN202011174328 A CN 202011174328A CN 114425943 A CN114425943 A CN 114425943A
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- gear
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- planetary gear
- permanent magnet
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- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 35
- 230000007246 mechanism Effects 0.000 claims abstract description 30
- 230000001360 synchronised effect Effects 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000005461 lubrication Methods 0.000 claims 1
- 230000009467 reduction Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 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
- B60K7/00—Disposition of motor in, or adjacent to, traction wheel
- B60K7/0007—Disposition of motor in, or adjacent to, traction wheel the motor being electric
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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
- B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
- B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion
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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
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
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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
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
- F16H57/082—Planet carriers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Retarders (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention relates to a gear-disengaging type wheel-side electric driving system structure which is arranged at the wheel side of each wheel of an automobile and comprises a permanent magnet synchronous motor, a planetary gear reducer, a gear-disengaging mechanism and a shell, wherein the permanent magnet synchronous motor, the planetary gear reducer and the gear-disengaging mechanism are integrally arranged in the shell, the permanent magnet synchronous motor drives a wheel hub of the wheel through the planetary gear reducer, and the gear-disengaging mechanism controls the power transmission between the planetary gear reducer and the wheel hub. Compared with the prior art, the structure of the electric driving system is independently arranged at the wheel edge, the traditional efficiency is high, the cruising ability of the electric automobile is increased, and the maneuverability and the controllability of the whole automobile can be more flexible.
Description
Technical Field
The invention relates to the field of electric automobile driving systems, in particular to a structure of a gear-disengaging type wheel-side electric driving system.
Background
The electric automobile is taken as the leading direction of the automobile industry development in recent years, zero emission and renewable electric functions are favored and valued by the market, and the pure electric automobile is taken as the main development direction of the new energy automobile at present, and the driving system efficiency and the driving form of the pure electric automobile are concerned, and especially under the condition that the battery capacity of the pure electric automobile is limited, the system efficiency and the driving form are proposed as the main performances and requirements of the automobile.
Most of electric vehicles in the market at present are refitted from a traditional fuel vehicle, an internal combustion engine is replaced by a motor, the transmission arrangement form is different from that of the fuel vehicle, the mechanical transmission efficiency and the driving form are not changed and improved greatly, the driving control form cannot be designed according to the optimization of the system efficiency, the power consumption of the system is increased, the endurance requirement of the whole vehicle cannot be met, and the economy of the vehicle is not high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an off-gear type wheel-side electric driving system structure which is used for improving the integration level, reducing the transmission energy loss and improving the endurance capacity of the whole vehicle.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a keep off formula wheel limit electricity and drive system architecture installs in the wheel limit of every drive wheel of car, includes PMSM, planetary gear reducer, keeps off mechanism and casing, PMSM, planetary gear reducer and the equal integrated installation in casing of keeping off the mechanism, PMSM passes through the wheel hub of planetary gear reducer connection wheel, the ring gear transmission of mechanism control planetary gear reducer that keeps off.
Furthermore, the shell comprises a shell of the permanent magnet synchronous motor and a box body of the planetary gear reducer, the shell is connected with the box body in a split mode, and the gear disengaging mechanism is installed in the box body.
Furthermore, the permanent magnet synchronous motor comprises a stator assembly, a rotor assembly and an end cover, wherein the rotor assembly is assembled in the shell, the end cover is connected with one side of the shell, a rotating shaft gear is arranged at the tail end of the rotor assembly and is used for being meshed with an input gear shaft of the planetary gear reducer, and a rotating shaft gear cantilever is arranged on the other side of the shell.
Further, the planetary gear reducer comprises an input gear shaft, a sun gear, a planet gear, an inner gear ring, a duplex bearing, a planet carrier assembly and a combined gear ring, one end of the input gear shaft is assembled on the shell through the bearing, the other end of the input gear shaft is connected with the planet carrier assembly through the bearing, the sun gear is installed on the input gear shaft, the inner gear ring is installed on the inner side of the box body through the duplex bearing, the planet gear is installed on the planet carrier assembly, the sun gear is connected with the inner gear ring through the planet gear, one side of the inner gear ring is further connected with the combined gear ring, the combined gear ring is used for being connected with the gear disengaging mechanism, and the planet carrier assembly is connected with a wheel hub of a wheel.
Furthermore, dog teeth or friction plates are arranged on the working end face of the combined gear ring.
Furthermore, an oil seal is assembled between the planet carrier assembly and the input gear shaft, the planet carrier assembly and the input gear shaft can rotate relatively, and the oil seal rotates along with the planet carrier assembly.
Further, the gear-disengaging mechanism comprises a locking ring tooth holder, a locking ring, a pressure spring and an electromagnetic clutch, the electromagnetic clutch and the locking ring tooth holder are fixed in the box body, the locking ring is assembled on the locking ring tooth holder and can slide along the locking ring tooth holder relatively, the pressure spring is uniformly distributed along one circle of the locking ring tooth holder and is installed between the locking ring and the locking ring tooth holder, and the locking ring is controlled by the electromagnetic clutch and is used for contacting with an inner gear ring of the planetary gear reducer.
Furthermore, the gear-disengaging mechanism also comprises a position sensor which is arranged on one side of the locking ring and is fixed on the box body.
Further, the permanent magnet synchronous motor, the planetary gear reducer and the gear-disengaging mechanism are integrated and then share oil for cooling and lubricating.
Compared with the prior art, the invention has the following beneficial effects:
1. the distributed wheel-side electric driving system structure provided by the invention has the advantages that the gear-disengaging type wheel-side electric driving system structure is arranged at the wheel side of the automobile driving wheel, and parts such as a transmission shaft, a differential mechanism and the like in the traditional automobile structure are omitted through independent integration of the permanent magnet synchronous motor, the planetary reduction system and the gear-disengaging mechanism in each electric driving system structure, so that the transmission efficiency is high, and the cruising ability of the electric automobile is improved; and each electric drive system structure is high in total integration level, the whole vehicle chassis space is optimized to the maximum extent, and other systems are convenient to arrange.
2. The structure of the electric driving system is independently arranged at the wheel edge, so that the flexibility and the controllability of the whole vehicle can be realized, the matching of the permanent magnet synchronous motor and the planetary reduction system can ensure the output of the peak torque at the wheel edge, the assembly stably runs in a system high-efficiency area, the miniaturization of the permanent magnet synchronous motor is realized, and the electric driving system can be integrally limited in the range of the wheel hub.
3. The deceleration system adopts a design of a gear-disengaging structure, and the addition of the gear-disengaging mechanism ensures the requirements of full drive and power generation of the vehicle at the right time, further improves the efficiency of the electric drive system of the vehicle and reduces the energy consumption; the gear-disengaging type wheel-side electric driving system serves as an independent driving module and works timely according to the requirement of the whole vehicle, and the applicability and reliability of the whole vehicle are further improved.
4. The whole motor system and the speed reducing system are communicated and share the cooling and lubricating system, so that the efficient transmission and heat dissipation of the system assembly are realized.
Drawings
Fig. 1 is an overall schematic view of the present invention.
Fig. 2 is a schematic view of the internal structure of the present invention.
Reference numerals: 1. permanent magnet synchronous motor, 2, planetary gear reducer, 3, gear-disengaging mechanism, 11, rotating shaft gear, 12, rotor assembly, 13, stator assembly, 14, end cover, 201, first bearing, 202, input gear shaft, 203, second bearing, 204, sun gear, 205, planet gear, 206, inner gear ring, 207, duplex bearing, 208, planet carrier assembly, 209, combination gear ring, 211, oil seal, 212, third bearing, 214, needle bearing, 31, lock ring gear seat, 32, lock ring, 33, pressure spring, 34, electromagnetic clutch, 35 and position sensor. 4. A shell 41, a shell 42 and a box body.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1 and 2, the present embodiment provides an electric drive system structure of a gear-disengaging type wheel, which is installed at the wheel of each wheel of an automobile and includes a permanent magnet synchronous motor 1, a planetary gear reducer 2 and a gear-disengaging mechanism 3. Wherein, the casing 41 of the permanent magnet synchronous motor 1 is connected with the box body 42 of the planetary gear reducer 2 in a split type to form a complete shell 4, and the gear-disengaging mechanism 3 is arranged in the box body 42. The permanent magnet synchronous motor 1 is connected with a wheel hub of a wheel through a planetary gear reducer 2, and the gear disengaging mechanism 3 controls the inner gear ring 206 of the planetary gear reducer 2 to transmit. The permanent magnet synchronous motor 1, the planetary gear reducer 2 and the gear disengaging mechanism 3 are integrated and then cooled and lubricated by oil.
The permanent magnet synchronous motor 1 comprises a rotating shaft gear 11, a rotor assembly 12, a stator assembly 13, an end cover 14 and a shell 41. Wherein the stator assembly 13 is fixed in the casing 41, and the rotor assembly 12 is assembled in the end cover 14 and the casing 41; the rotary shaft gear 11 is mounted on the end of the rotor assembly 12, and the rotary shaft gear 11 is cantilevered on the side of the housing 41 and drives the planetary gear reducer 2.
The permanent magnet synchronous motor 1 and the planetary gear reducer 2 are in meshing transmission through the rotating shaft gear 11 and the input gear shaft 202. The planetary gear reducer 2 includes an input gear shaft 202, a sun gear 204, a planetary gear 205, an internal gear 206, a double bearing 207, a carrier assembly 208, a joint ring gear 209, a casing 42, an oil seal 211, a needle bearing 214, a first bearing 201, a second bearing 203, and a third bearing 212. The sun gear 204 is fixed to an input gear shaft 202, and the input gear shaft 202 is mounted on the housing 41 through a first bearing 201 at one end and mounted in the carrier assembly 208 through a needle bearing 214 at the other end. An oil seal 211 is installed in the carrier assembly 208, and the oil seal 211 acts on the input gear shaft 202. The planet carrier assembly 208 is mounted on the input gear shaft 202 at one end via the second bearing 203 and on the casing 42 at the other end via the third bearing 212. The housing 42 also mounts an oil seal 211 which acts against the planet carrier assembly 208 to form a seal. The inner gear ring 206 is assembled in the box body 42 through a duplex bearing 207, wherein the inner ring of the duplex bearing 207 is assembled on the inner gear ring 206, and the outer ring of the duplex bearing 207 is assembled on the box body 42; a coupling ring gear 209 is fixed to the ring gear 206, and the coupling ring gear 209 functions as a shift-out and speed-reducing mechanism 3 for the planetary gear reducer 2.
The shift-out mechanism mainly includes a lock ring carrier 31, a lock ring 32, a pressure spring 33, an electromagnetic clutch 34, and a position sensor 35. In which the electromagnetic clutch 34 is fixed in the case 42 together with the lock ring carrier 31. Lock ring 32 is fitted over lock ring carrier 31 and is relatively slidable but non-rotatable along lock ring carrier 31. Compression springs 33 are evenly distributed around the lock ring toothholder 34 and are fitted between the lock ring 32 and the electromagnetic clutch 34.
When the electromagnetic clutch 34 is powered off, the lock ring 32 and the combined gear ring 209 are pressed by the pressure spring 33, and because the combined surface of the lock ring 32 and the combined gear ring 209 is provided with dog teeth or friction plates, the combined gear ring 209 and the inner gear ring 206 form locking constraint on the lock ring tooth holder 31, and the planetary gear reducer 2 forms a speed reduction function. When the input gear shaft 202 rotates together with the sun gear 204, the inner gear ring 206 is braked, and the planet carrier assembly 208 decelerates to transmit output power.
When the electromagnetic clutch 34 is energized, the lock ring 32 is sucked back, the joint surface of the lock ring 32 and the joint ring gear 209 is disengaged, and when the input gear shaft 202 rotates together with the sun gear 204, the ring gear 206 together with the joint ring gear 209 idles on the duplex bearing 207, and the planetary gear reducer 2 loses the speed reduction function. Wherein the gear state of the planetary gear reducer 2 is fed back by the position sensor 35, the position sensor 35 feeds back an on-gear signal when the lock ring 32 is locked with the coupling ring gear 209, and the position sensor 35 feeds back a neutral signal when the lock ring 32 is separated from the coupling ring gear 209, wherein the position sensor 35 is fixed on the case 42.
This embodiment is with the wheel limit of motor system integration to the drive wheel, saves spare parts such as transmission shaft and differential mechanism, increases the turn round through the speed reduction of wheel limit speed reducing system, realizes that driving motor is miniaturized, adopts the structural design that can take off the gear to speed reducing system simultaneously for drive wheel control is more nimble, realizes in good time drive and electricity generation, and whole motor system and speed reducing system intercommunication and sharing cooling and lubricating system realize the high-efficient transmission of system assembly and dispel the heat.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. The utility model provides a keep off formula wheel limit electricity and drive system architecture, its characterized in that installs in the wheel limit of car drive wheel, includes permanent magnet synchronous motor (1), planetary gear reducer (2), keeps off mechanism (3) and casing (4), permanent magnet synchronous motor (1), planetary gear reducer (2) and keep off mechanism (3) and all integrate and install in casing (4), permanent magnet synchronous motor (1) pass through the wheel hub that planetary gear reducer (2) connected the wheel, the inner gear ring (206) transmission of keeping off mechanism (3) control planetary gear reducer (2).
2. A structure of a declutching type wheel hub electric drive system as claimed in claim 1, wherein the housing (4) comprises a casing (41) of the permanent magnet synchronous motor (1) and a casing (42) of the planetary gear reducer (2), the casing (41) and the casing (42) are connected in a split manner, and the declutching mechanism (3) is installed in the casing (42).
3. A structure of a declutching type wheel hub electric drive system as claimed in claim 2, wherein the permanent magnet synchronous motor (1) comprises a stator assembly (13), a rotor assembly (12) and an end cover (14), the rotor assembly (12) is assembled in a housing (41), the end cover (14) is connected to one side of the housing (41), a rotary shaft gear (11) is mounted at the end of the rotor assembly (12) for meshing with an input gear shaft (202) of the planetary gear reducer (2), and the rotary shaft gear (11) is arranged at the other side of the housing (41) in a cantilever manner.
4. The structure of the gear-disengaging type wheel-side electric drive system according to claim 2, wherein the planetary gear reducer (2) comprises an input gear shaft (202), a sun gear (204), planet gears (205), an inner gear ring (206), a duplex bearing (207), a planet carrier assembly (208) and a combined gear ring (209), one end of the input gear shaft (202) is assembled on the shell (41) through a bearing, the other end of the input gear shaft is connected with the planet carrier assembly (208) through a bearing, the sun gear (204) is installed on the input gear shaft (202), the inner gear ring (206) is installed on the inner side of the box body (42) through the duplex bearing (207), the planet gears (205) are installed on the planet carrier assembly (208), the sun gear (204) is connected with the inner gear ring (206) through the planet gears (205), and one side of the inner gear ring (206) is further connected with the combined gear ring (209), the combined gear ring (209) is used for connecting a gear disengaging mechanism (3), and the planet carrier assembly (208) is connected with a hub of a wheel.
5. An electric drive system arrangement according to claim 4, characterised in that the working end face of the associated toothed ring (209) is provided with dog teeth or friction plates.
6. The electric drive system structure of the gear disengaging type wheel edge is characterized in that an oil seal (211) is assembled between the planet carrier assembly (208) and the input gear shaft (202), the planet carrier assembly (208) and the input gear shaft (202) can rotate relatively, and the oil seal (211) rotates along with the planet carrier assembly (208).
7. A declutching type wheel rim electric drive system structure according to claim 2, characterized in that the declutching mechanism (3) comprises a lock ring gear holder (31), a lock ring (32), a compression spring (33) and an electromagnetic clutch (34), the electromagnetic clutch (34) is fixed in the case (42) together with the lock ring gear holder (31), the lock ring (32) is assembled on the lock ring gear holder (31) and can relatively slide along the lock ring gear holder (31), the compression springs (33) are uniformly distributed along a circumference of the lock ring gear holder (31) and are installed between the lock ring (32) and the lock ring gear holder (31), and the lock ring (32) is controlled by the electromagnetic clutch (34) and is used for contacting an inner gear ring (206) of the planetary gear reducer (2).
8. An electric drive system architecture for a wheel hub of the type defined in claim 7, characterized in that said disengagement mechanism (3) further comprises a position sensor (35) mounted on one side of the locking ring (32) and fixed to the casing (42).
9. A structure of a declutching wheel-side electric drive system according to claim 1, characterized in that the permanent magnet synchronous motor (1), the planetary gear reducer (2) and the declutching mechanism (3) are integrated and then share oil cooling for lubrication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011174328.7A CN114425943A (en) | 2020-10-28 | 2020-10-28 | Off-gear type wheel-side electric driving system structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011174328.7A CN114425943A (en) | 2020-10-28 | 2020-10-28 | Off-gear type wheel-side electric driving system structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114425943A true CN114425943A (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011174328.7A Pending CN114425943A (en) | 2020-10-28 | 2020-10-28 | Off-gear type wheel-side electric driving system structure |
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| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107314054A (en) * | 2016-04-27 | 2017-11-03 | 迪尔公司 | Working vehicle drive component |
| US20180298994A1 (en) * | 2015-12-25 | 2018-10-18 | Byd Company Limited | Power-driven system and vehcile having the same |
| CN110341465A (en) * | 2019-07-17 | 2019-10-18 | 东风汽车集团有限公司 | A kind of automobile-used two grades of speed change integrated electric wheel drive units and the automobile containing the driving unit |
| CN214324873U (en) * | 2020-10-28 | 2021-10-01 | 上海汽车电驱动有限公司 | Off-gear type wheel-side electric driving system structure |
-
2020
- 2020-10-28 CN CN202011174328.7A patent/CN114425943A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180298994A1 (en) * | 2015-12-25 | 2018-10-18 | Byd Company Limited | Power-driven system and vehcile having the same |
| CN107314054A (en) * | 2016-04-27 | 2017-11-03 | 迪尔公司 | Working vehicle drive component |
| CN110341465A (en) * | 2019-07-17 | 2019-10-18 | 东风汽车集团有限公司 | A kind of automobile-used two grades of speed change integrated electric wheel drive units and the automobile containing the driving unit |
| CN214324873U (en) * | 2020-10-28 | 2021-10-01 | 上海汽车电驱动有限公司 | Off-gear type wheel-side electric driving system structure |
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