CN116572720A - Coaxial double-motor electric drive axle - Google Patents

Coaxial double-motor electric drive axle Download PDF

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Publication number
CN116572720A
CN116572720A CN202310600977.6A CN202310600977A CN116572720A CN 116572720 A CN116572720 A CN 116572720A CN 202310600977 A CN202310600977 A CN 202310600977A CN 116572720 A CN116572720 A CN 116572720A
Authority
CN
China
Prior art keywords
gear
planetary
driving
sun gear
planet carrier
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
Application number
CN202310600977.6A
Other languages
Chinese (zh)
Inventor
徐明宇
姜雷
许可
王震
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FAW Jiefang Automotive Co Ltd
Original Assignee
FAW Jiefang Automotive Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FAW Jiefang Automotive Co Ltd filed Critical FAW Jiefang Automotive Co Ltd
Priority to CN202310600977.6A priority Critical patent/CN116572720A/en
Publication of CN116572720A publication Critical patent/CN116572720A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/16—Axle housings
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

The application relates to a coaxial double-motor electric drive axle, which comprises a drive axle shell and two symmetrically arranged and coaxially arranged electric power assemblies, wherein each electric power assembly comprises a drive motor, a first planetary reducer, a gear shifting assembly, a second planetary reducer and a drive wheel, and the first planetary reducer comprises a first planetary row and a second planetary row; the driving motor is connected with the first planetary row and the second planetary reducer in a transmission way through the half shaft, and the gear shifting assembly is connected with the second planetary row. The two electric power assemblies are symmetrically arranged and coaxially arranged, so that the driving axle is more reasonable in distribution, the theoretical centroid is coaxial with the axis of the driving axle shell, and the stress and vibration conditions are improved; through setting up two driving motor and two gear shifting assemblies, can realize distributed drive, and saved differential mechanism, greatly reduced the weight of transaxle, simplified the structure, and gear shifting assembly can realize cutting gear shift, satisfies the requirement of car to transaxle high speed and big moment of torsion.

Description

Coaxial double-motor electric drive axle
Technical Field
The application relates to the technical field of automobiles, in particular to a coaxial double-motor electric drive axle.
Background
With the promotion of the pollutant emission standard of the motor vehicle in the sixth stage of the country, the research on the electric drive technology of the motor vehicle is gradually deepened in various fields. Unlike electric passenger cars, electric drive axles for electric utility vehicles are much larger in size and weight. Because commercial vehicles have higher requirements on power source torque, a double-motor driving mode is mostly adopted, the traditional bridge structure is generally changed in consideration of the universality of mechanical parts, a centralized driving mode is mostly adopted, a differential mechanism and a parallel shaft type speed reducer are arranged, the differential mechanism is arranged, the assembly structure is more complicated and heavier, and the parallel shaft type speed reducer structure can cause the bias of a transmission structure and the unbalanced load of the gravity center.
In patent document CN218430729U, a coaxial electric drive bridge structure is designed, which changes the arrangement mode of the traditional electric drive system of the electric automobile, integrates a motor, a speed reducer and a differential mechanism, realizes the high integration of a driving mechanism, and simultaneously coaxially arranges the integrated driving mechanism with a left half shaft and a right half shaft, so that the space occupied by the transmission motor, the speed reducer and the differential mechanism when being distributed at intervals is reduced, but the scheme is that the single motor outputs torque after being decelerated by a first-stage planetary gear, the single motor has limited capability, and the single motor is driven in a centralized way by a differential mechanism, so that the transmission efficiency is lower.
Disclosure of Invention
Based on this, it is necessary to provide a coaxial type double-motor electric drive axle capable of improving stress and vibration conditions, realizing distributed driving, improving transmission efficiency, omitting a differential mechanism, greatly reducing the weight of the drive axle, simplifying the structure of the drive axle, and simultaneously realizing gear shifting.
A coaxial double motor electric drive axle comprising:
a transaxle housing having a first central axis;
the two electric power assemblies are symmetrically arranged on two sides of the first central axis, and the two electric power assemblies are coaxially arranged; each electric power assembly comprises a driving motor, a first planetary reducer, a gear shifting assembly, a second planetary reducer and driving wheels, wherein the first planetary reducer comprises a first planetary row and a second planetary row in transmission connection with the first planetary row;
the driving motor is in transmission connection with the first planetary row and the second planetary reducer in sequence through a half shaft, and the gear shifting assembly is in transmission connection with the second planetary row so as to realize gear shifting; the second planetary reducer is in transmission connection with the driving wheel and is arranged close to the driving wheel.
In one embodiment, the first planet row and the second planet row are sequentially arranged on the half shaft and are in transmission connection with the half shaft.
In one embodiment, the first planet row includes a first sun gear, a first planet gear, a first gear ring and a first planet carrier, the first sun gear is in transmission connection with the driving motor, and the first planet gear is in transmission connection with the first planet carrier, the first sun gear and the first gear ring;
and/or the second planet row comprises a second sun gear, a second planet wheel, a second gear ring and a second planet carrier, wherein the second sun gear is in transmission connection with the half shaft, and the second planet wheel is in transmission connection with the second planet carrier, the second sun gear and the second gear ring; the second gear ring is in transmission connection with the first planet row; the second sun gear and the second planet carrier are in transmission connection with the gear shifting assembly.
In one embodiment, the gear shifting assembly comprises a gear shifting gear sleeve, a fixed combining tooth, a second sun gear combining tooth arranged on the second sun gear and a second planet carrier combining tooth arranged on the second planet carrier, wherein the fixed combining tooth is arranged on the driving axle shell, and the gear shifting gear sleeve can be matched with the second sun gear combining tooth, the second planet carrier combining tooth and the fixed combining tooth to realize gear shifting position cutting.
In one embodiment, the shift sleeve has inner and outer coupling teeth, the inner coupling teeth being capable of intermesh with the second sun and planet carrier coupling teeth; the outer combination teeth can be matched with the fixed combination teeth, the gear shifting gear sleeve is arranged between the second sun gear combination teeth and the second planet carrier combination teeth and the fixed combination teeth, and the gear shifting gear sleeve can realize gear shifting and gear shifting by axial movement.
In one embodiment, a first gear shift is achieved when the inner and second sun gear coupling teeth are intermeshed and the outer coupling tooth is capable of intermesh with the fixed coupling tooth;
and/or, when the inner coupling tooth is mutually matched with the second sun gear coupling tooth and the inner coupling tooth is mutually matched with the second planet carrier coupling tooth, the second gear shift can be realized.
In one embodiment, the inner coupling teeth are splined to the second sun gear coupling teeth and the second planet carrier coupling teeth;
and/or the outer bond tooth can be splined to the fixed bond tooth.
In one embodiment, the gear shifting tooth sleeve comprises two inner annular surfaces and an outer annular surface, the outer annular surface is arranged between the two inner annular surfaces, the inner combining teeth are arranged on the inner annular surface of the gear shifting tooth sleeve, and the outer combining teeth are arranged on the outer annular surface of the gear shifting tooth sleeve.
In one embodiment, the two driving motors, the two first planetary reducers and the two gear shifting components are symmetrically arranged in the driving axle housing with respect to the first central axis, and the gear shifting components are arranged in the driving motors.
In one embodiment, the coaxial double-motor electric drive axle further comprises a first controller and a second controller, the first controller and the second controller are connected with the two driving motors in one-to-one correspondence, and the first controller and the second controller are respectively used for controlling the rotating speeds of the corresponding driving motors.
In the scheme, the two electric power assemblies are symmetrically arranged and coaxially arranged, so that the driving motor, the first planetary reducer, the gear shifting assembly, the second planetary reducer and the driving wheel are more reasonably distributed, the theoretical centroid is coaxial with the axis of the driving axle housing, the stress and vibration conditions are greatly improved, and the structure is small and compact; by arranging the two driving motors and the two gear shifting assemblies, distributed driving can be realized, transmission efficiency can be improved, a differential mechanism is omitted, the weight of a driving axle is greatly reduced, the structure of the driving axle is simplified, and the gear shifting assemblies can realize gear shifting, so that the requirements of an automobile on high speed and large torque of the driving axle are met; by adopting the wheel side reduction for the second planetary reducer, the size of the center part of the drive axle is reduced, which is beneficial to the trafficability of the automobile.
Drawings
Fig. 1 is a schematic diagram of a structural wire frame of a coaxial dual motor electric drive axle according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a second sun gear and a second sun gear coupling tooth according to an embodiment of the application.
Fig. 3 is a schematic structural diagram of a second planet carrier, a second planet carrier coupling tooth and a third sun gear according to an embodiment of the present application.
Fig. 4 is a schematic view showing a part of the structure of a gear shifting assembly according to an embodiment of the present application.
Description of the reference numerals
10. Coaxial double-motor electric drive axle; 100. a transaxle housing; 200. an electric power assembly; 210. a driving motor; 220. a first planetary reducer; 221. a first row of satellites; 2211. a first sun gear; 2212. a first planet; 2213. a first ring gear; 2214. a first planet carrier; 222. a second planet row; 2221. a second sun gear; 2222. a second planet wheel; 2223. a second ring gear; 2224. a second carrier; 230. a shift assembly; 231. a gear shifting tooth sleeve; 2231. an inner coupling tooth; 2232. an outer coupling tooth; 232. fixing the combination teeth; 233. a second sun gear engaging tooth; 234. a second carrier-engaging tooth; 240. a second planetary reducer; 241. a third sun gear; 242. a third planet wheel; 243. a third ring gear; 244. a third carrier; 250. a driving wheel; 260. and a half shaft.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.
Referring to fig. 1, in an embodiment of the application, a coaxial dual-motor electric drive axle 10 is provided, which includes a drive axle housing 100 and two electric power assemblies 200, wherein the drive axle housing 100 has a first central axis, and the two electric power assemblies 200 are symmetrically disposed on two sides of the first central axis of the drive axle housing 100. It should be appreciated that the transaxle housing 100 is symmetrical about the first central axis. The two electric power assemblies 200 are symmetrically arranged along the first central axis.
Referring to fig. 1, 2 and 3, each electric powertrain 200 includes a driving motor 210, a first planetary reducer 220, a gear shift assembly 230, a second planetary reducer 240 and a driving wheel 250, and specifically, the electric powertrain 200 located on the left side of the first central axis includes the first planetary reducer 220, the driving motor 210, the gear shift assembly 230, the second planetary reducer 240 and the driving wheel 250, which are sequentially disposed from right to left. The electromotive force assembly 200 located on the right side of the first central axis includes a first planetary reducer 220, a driving motor 210 and a gear shift assembly 230, a second planetary reducer 240 and a driving wheel 250, which are disposed in this order from left to right. Through setting up two electric power assemblies 200 symmetry, and first planetary reducer 220, driving motor 210 and gearshift subassembly 230, second planetary reducer 240 and drive wheel 250 interval set up, can realize distributed drive, save differential mechanism, and can control the rotational speed and the moment of torsion of drive wheel 250 more conveniently, improved transmission efficiency, greatly reduced the weight of transaxle simultaneously, simplified the structure of transaxle.
The two electric power units 200 are coaxially arranged. Specifically, the half shafts 260 each have a second central axis, the second central axes of the half shafts 260 are coincident with each other, and the second central axes intersect with the first central axis. The power output shafts of the two driving motors 210 have a third central axis, and the third central axis and the second central axis coincide with each other. The centers of rotation of the first planetary reducer 220, the second planetary reducer 240, and the drive wheel 250 are all located on the second central axis.
Referring to fig. 1, 2 and 3, the first planetary reducer 220 includes a first planetary row 221 and a second planetary row 222 in driving connection with the first planetary row 221. The drive motor 210 is in driving connection with the first row 221 via half shafts 260. Specifically, the power output end of the driving motor 210 is in driving connection with the half shaft 260, the half shaft 260 is in driving connection with the first planetary gear set 221, the first planetary gear set 221 is in driving connection with the second planetary gear set 222, the driving motor 210 transmits torque to the half shaft 260, the half shaft 260 transmits torque to the first planetary gear set 221, and the first planetary gear set 221 finally transmits torque to the second planetary gear set 222. The power output end of the driving motor 210 is directly connected with the first planetary reducer 220 through the half shaft 260, so that a differential mechanism is omitted, the power transmission level is reduced, and the transmission efficiency is improved.
The shift assembly 230 is in driving connection with the second planetary row 222 to effect a gear shift. Specifically, the shift assembly 230 acts on the second planetary row 222 such that the gear ratio of the second planetary row 222 is 1 or not 1. It is to be understood that: when the gear ratio of the second planetary gear set 222 is 1, the first planetary reducer 220 corresponds to only one stage of reduction. When the gear ratio of the second planetary gear set 222 is not 1, the first planetary reducer 220 has a two-stage reduction. When the first planetary reducer 220 has a two-stage reduction, the gear of the automobile is first gear. When the first planetary reducer 220 has only one-stage reduction, the gear of the automobile is the second gear.
Referring to fig. 1, 2 and 3, the driving motor 210 is sequentially connected to the first planetary gear 221 and the second planetary reducer 240 through a half shaft 260. Specifically, the first planetary reducer 220 and the second planetary reducer 240 are respectively disposed at two opposite ends of the half shaft 260. The drive motor 210 first transmits torque to the first planetary reducer 220 via the axle shafts 260 and then to the second planetary reducer 240 via the axle shafts 260.
The second planetary reducer 240 is in driving connection with the driving wheel 250, and the second planetary reducer 240 can transmit torque to the driving wheel 250 to drive the driving wheel 250 to rotate. The second planetary reducer 240 may be disposed near the drive wheel 250 or may be disposed within the drive wheel 250. Specifically, the center of rotation of the second planetary reducer 240 coincides with the center of rotation of the driving wheel 250, so that the second planetary reducer 240 moves the corresponding driving wheel 250.
By symmetrically arranging the two electric power assemblies 200, and coaxially arranging the two electric power assemblies 200, the drive motor 210, the first planetary reducer 220, the gear shifting assembly 230, the second planetary reducer 240 and the drive wheel 250 are reasonably distributed, and the theoretical centroid is coaxial with the axis of the drive axle housing 100, so that the stress and vibration conditions are greatly improved; by arranging the two driving motors 210 and the two gear shifting assemblies 230, distributed driving can be realized, a differential mechanism is omitted, the weight of a driving axle is greatly reduced, the structure of the driving axle is simplified, and the gear shifting assemblies 230 can realize gear shifting, so that the requirements of an automobile on high speed and large torque of the driving axle are met; by decelerating the second planetary reducer 240 with a wheel side, the center portion of the transaxle is reduced in size, facilitating vehicle passability.
The coaxial double motor electric drive axle 10 of the embodiment of the present application is described in detail below with reference to the drawings.
Referring to fig. 1, 2 and 3, according to some embodiments of the present application, optionally, the first planet row 221 and the second planet row 222 are sequentially disposed on the half shaft 260 and are all in driving connection with the half shaft 260. Specifically, the first planetary reducer 220 located on the left side of the first central axis includes a second planetary row 222, a first planetary row 221, which are disposed in this order from right to left. The first planetary reducer 220 located on the right side of the first central axis includes a second planetary row 222 and a first planetary row 221, which are disposed in order from left to right.
Further, referring to fig. 1, 2 and 3, the first planet row 221 includes a first sun gear 2211, a first planet gear 2212, a first ring gear 2213 and a first planet carrier 2214, the first sun gear 2211 is in driving connection with the driving motor 210, and the first planet gear 2212 is in driving connection with the first planet carrier 2214, the first sun gear 2211 and the first ring gear 2213. Specifically, the first sun gear 2211 is sleeved on the power output end of the driving motor 210. The first planet gear 2212 is sleeved on the planet shaft of the first planet carrier 2214 through a bearing, and the gears of the first planet gear 2212 are meshed with the gears of the first sun gear 2211 and the first gear ring 2213 respectively. The first ring gear 2213 is connected to the transaxle housing 100.
Referring to fig. 1, 2 and 3, the second planetary gear row 222 includes a second sun gear 2221, a second planet gear 2222, a second ring gear 2223 and a second planet carrier 2224, the second sun gear 2221 is in transmission connection with the half shaft 260, and the second planet gear 2222 is in transmission connection with the second planet carrier 2224, the second sun gear 2221 and the second ring gear 2223. The second ring gear 2223 is in driving connection with the first row of planet gears 221. The second sun gear 2221 and the second planet carrier 2224 are in driving connection with the shift assembly 230. Specifically, second sun gear 2221 is sleeved on half shaft 260. The second planet carrier 2224 is sleeved on the second sun gear 2221. The second planet wheel 2222 is sleeved on a planet shaft of the second planet carrier 2224 through a bearing, and gears of the second planet wheel 2222 are meshed with gears of the second sun wheel 2221 and the second gear ring 2223 respectively. The second ring gear 2223 is in driving connection with the first carrier 2214.
Referring to fig. 1, 2, 3 and 4, according to some embodiments of the present application, the shifting assembly 230 optionally includes a shifting gear sleeve 231, a fixed engaging tooth 232, a second sun gear 2221 engaging tooth formed on the second sun gear 2221, and a second planet carrier 2224 engaging tooth formed on the second planet carrier 2224. The fixed engaging teeth 232 are disposed on the transaxle housing 100, and the gear shifting sleeve 231 can cooperate with the second sun gear 2221 engaging teeth, the second planet carrier 2224 engaging teeth and the fixed engaging teeth 232 to realize gear shifting.
Specifically, referring to fig. 2, 3 and 4, the shift sleeve 231 has an inner coupling tooth 2231 and an outer coupling tooth 2232, and the inner coupling tooth 2231 is capable of cooperating with the second sun gear 2221 coupling tooth and the second planet carrier 2224 coupling tooth. The outer coupling tooth 2232 can cooperate with the fixed coupling tooth 232, the shift tooth sleeve 231 is disposed between the second sun gear 2221 coupling tooth and the second planet carrier 2224 coupling tooth and the fixed coupling tooth 232, and the shift tooth sleeve 231 can realize a gear shift position by axial movement. More specifically, a space for axial movement of the shift sleeve 231 is formed between the second sun gear 2221 coupling tooth and the second carrier 2224 coupling tooth and the fixed coupling tooth 232.
Further, a first gear shift can be achieved when the inner bond tooth 2231 is intermeshed with the second sun gear 2221 bond tooth and the outer bond tooth 2232 is capable of intermeshed with the fixed bond tooth 232. A second gear shift is achieved when the inner bond tooth 2231 intermeshes with the second sun gear 2221 bond tooth and the inner bond tooth 2231 intermeshes with the second planet carrier 2224 bond tooth.
The first gear implementation principle is as follows: the shift sleeve 231 is driven to move leftwards, so that the inner coupling tooth 2231 is matched with the coupling tooth of the second sun gear 2221, and meanwhile, the outer coupling tooth 2232 can be matched with the fixed coupling tooth 232, which is equivalent to fixing the position of the second sun gear 2221 of the second planetary gear set 222. At this time, power is input through the first sun gear 2211, then output through the first planet carrier 2214, then input through the second gear ring 2223, and finally output through the second planet carrier 2224, and is subjected to two-stage speed reduction, so that speed reduction and torque increase are realized.
It should be noted that: the power is output through the power output end of the driving motor 210, the power output end of the driving motor 210 is in transmission connection with the first sun gear 2211, the power can be transmitted to the first sun gear 2211, the gears of the first planet gears 2212 are respectively meshed with the gears of the first sun gear 2211 and the first gear ring 2213, and the power can be output to the first planet gears 2212 and the first gear ring 2213. The first ring gear 2213 is connected to the transaxle housing 100. The first planet 2212 is sleeved on the planet shaft of the first planet carrier 2214 through a bearing, and can output power to the first planet carrier 2214. The first planet carrier 2214 is in driving connection with the second ring gear 2223, and can transfer power to the second ring gear 2223. The gears of the second planetary gear 2222 mesh with the gears of the second ring gear 2223, and power can be transmitted to the second planetary gear 2222. The gear of the second planet wheel 2222 is meshed with the second sun wheel 2221, so that power can be transmitted to the second sun wheel 2221, and the second planet wheel 2222 is sleeved on a planet shaft of the second planet carrier 2224 through a bearing, so that power can be transmitted to the second planet carrier 2224. The second sun gear 2221 is sleeved on the half shaft 260, the second planet carrier 2224 is sleeved on the second sun gear 2221, so that power can be transmitted to the half shaft 260, the half shaft 260 transmits power to the second planetary reducer 240, and the second planetary reducer 240 can transmit power to the driving wheel 250.
The second gear implementation principle is as follows: the shift sleeve 231 is driven to move rightward, causing the inner coupling tooth 2231 to intermesh with the coupling tooth of the second sun gear 2221, while the inner coupling tooth 2231 intermeshes with the coupling tooth of the second planet carrier 2224. Because the second sun gear 2221 engaging tooth of the second planetary gear row 222 and the second planet carrier 2224 engaging tooth cooperate with the gear shifting sleeve 231, the second planetary gear row 222 is locked, so that the transmission ratio of the second planetary gear row 222 is 1. At this time, power is input through the first sun gear 2211, output through the first carrier 2214, input through the second ring gear 2223, and output through the second carrier 2224. Since the transmission ratio of the second planetary gear set 222 is 1, only one-stage reduction is actually performed, so that speed reduction and torque increase are realized. It should be noted that: the second gear power transmission route is the same as the first gear power transmission route, and the application is not repeated.
Referring to fig. 1, 2, 3 and 4, according to some embodiments of the application, the inner coupling tooth 2231 is optionally splined to the second sun gear 2221 coupling tooth and the second planet carrier 2224 coupling tooth. The outer bond tooth 2232 can be splined to the fixed bond tooth 232. Specifically, external splines are disposed on the second sun gear 2221 coupling teeth and the second planet carrier 2224 coupling teeth. The fixed coupling teeth 232 are provided with internal splines.
The inner engaging tooth 2231 is disposed on an inner annular surface of the shift sleeve 231 and the outer engaging tooth 2232 is disposed on an outer annular surface of the shift sleeve 231. The inner ring surface comprises two outer ring surfaces which are arranged between the two inner ring surfaces. Specifically, the outer circumferential surface of the shift sleeve 231 is provided with an external spline. The inner annular surface of the shift sleeve 231 is provided with an inner spline.
The external splines of the shift sleeve 231 are connected with the internal splines of the fixed coupling teeth 232. The internal spline of the shift sleeve 231 is connected with the external spline of the second sun gear 2221 coupling tooth and the second planet carrier 2224 coupling tooth. Specifically, the spline length of the internal spline of the shift tooth sleeve 231 that mates with the external spline of the second sun gear 2221 coupling tooth is greater than the spline length of the internal spline of the shift tooth sleeve 231 that mates with the external spline of the second planet carrier 2224 coupling tooth.
Referring to fig. 1, according to some embodiments of the present application, optionally, two driving motors 210, two first planetary reducers 220 and two shifting assemblies 230 are disposed symmetrically in the driving axle housing 100 about a first central axis, and the shifting assemblies 230 are disposed inside the driving motors 210. By disposing the two driving motors 210, the two first planetary reducers 220 and the two shifting units 230 in the driving axle housing 100 and disposing the shifting units 230 in the driving motors 210, the space utilization rate in the driving axle housing 100 and the driving motors 210 can be improved.
Referring to fig. 1 and 3, according to some embodiments of the present application, optionally, the second planetary reducer 240 includes a third sun gear 241, a third planet gear 242, a third ring gear 243, and a third planet carrier 244, wherein the third ring gear 243 is connected to the driving axle housing 100, and the third sun gear 241 is in driving connection with the half axle 260.
The third planet gears 242 are in driving connection with a third planet carrier 244, a third sun gear 241 and a third ring gear 243. Specifically, the third sun gear 241 is sleeved on the half shaft 260. The third planetary gear 242 is sleeved on the planetary shaft of the third planetary carrier 244 through a bearing, and the gears of the third planetary gear 242 are meshed with the gears of the third sun gear 241 and the third gear ring 243 respectively.
Referring to fig. 1, according to some embodiments of the present application, optionally, the coaxial dual-motor electric drive axle 10 further includes a first controller and a second controller, wherein the first controller and the second controller are connected to the two driving motors 210 in a one-to-one correspondence, and the first controller and the second controller are respectively used for controlling the rotation speeds of the corresponding driving motors 210.
The first and second controllers adjust the rotational speeds of the corresponding driving motors 210 so as to balance the torque difference between the two half shafts 260 to which the power output ends of the two driving motors 210 are correspondingly connected. The two drive motors 210 are independently controlled, and a mechanical differential mechanism is not required, so that the transmission efficiency, the control accuracy, the reliability and the electromagnetic performance are improved. Illustratively, the drive motor 210 employs an external rotor motor.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A coaxial double motor electric drive axle, comprising:
a transaxle housing having a first central axis;
the two electric power assemblies are symmetrically arranged on two sides of the first central axis, and the two electric power assemblies are coaxially arranged; each electric power assembly comprises a driving motor, a first planetary reducer, a gear shifting assembly, a second planetary reducer and driving wheels, wherein the first planetary reducer comprises a first planetary row and a second planetary row in transmission connection with the first planetary row;
the driving motor is in transmission connection with the first planetary row and the second planetary reducer in sequence through a half shaft, and the gear shifting assembly is in transmission connection with the second planetary row so as to realize gear shifting; the second planetary reducer is in transmission connection with the driving wheel and is arranged close to the driving wheel.
2. The coaxial dual-motor electric drive axle of claim 1, wherein the first planetary row and the second planetary row are sequentially disposed on the axle shaft and are each in driving connection with the axle shaft.
3. The coaxial double-motor electric drive axle of claim 1, wherein the first planet row comprises a first sun gear, a first planet gear, a first ring gear, and a first planet carrier, the first sun gear is in driving connection with the drive motor, and the first planet gear is in driving connection with the first planet carrier, the first sun gear, and the first ring gear;
and/or the second planet row comprises a second sun gear, a second planet wheel, a second gear ring and a second planet carrier, wherein the second sun gear is in transmission connection with the half shaft, and the second planet wheel is in transmission connection with the second planet carrier, the second sun gear and the second gear ring; the second gear ring is in transmission connection with the first planet row; the second sun gear and the second planet carrier are in transmission connection with the gear shifting assembly.
4. The coaxial double-motor electric drive axle of claim 3, wherein the gear shifting assembly comprises a gear shifting gear sleeve, a fixed combination gear, a second sun gear combination gear arranged on the second sun gear and a second planet carrier combination gear arranged on the second planet carrier, the fixed combination gear is arranged on the drive axle shell, and the gear shifting gear sleeve can be matched with the second sun gear combination gear, the second planet carrier combination gear and the fixed combination gear to realize gear shifting.
5. The coaxial double motor electric drive axle of claim 4, wherein the shift sleeve has inner and outer coupling teeth, the inner coupling teeth being capable of interfitting with the second sun gear coupling teeth and the second planet carrier coupling teeth; the outer combination teeth can be matched with the fixed combination teeth, the gear shifting gear sleeve is arranged between the second sun gear combination teeth and the second planet carrier combination teeth and the fixed combination teeth, and the gear shifting gear sleeve can realize gear shifting and gear shifting by axial movement.
6. The coaxial double motor electric drive axle of claim 5, wherein a first gear shift is achieved when the inner coupling tooth and the second sun gear coupling tooth are mated with each other and the outer coupling tooth is capable of being mated with the fixed coupling tooth;
and/or, when the inner coupling tooth is mutually matched with the second sun gear coupling tooth and the inner coupling tooth is mutually matched with the second planet carrier coupling tooth, the second gear shift can be realized.
7. The coaxial double motor electric drive axle of claim 5, wherein the inner coupling teeth are splined to the second sun gear coupling teeth and the second planet carrier coupling teeth;
and/or the outer bond tooth can be splined to the fixed bond tooth.
8. The coaxial double-motor electric drive axle of claim 5, wherein the gear shifting sleeve comprises two inner annular surfaces and an outer annular surface, the outer annular surface is arranged between the two inner annular surfaces, the inner combining teeth are arranged on the inner annular surface of the gear shifting sleeve, and the outer combining teeth are arranged on the outer annular surface of the gear shifting sleeve.
9. The coaxial dual-motor electric drive axle of claim 1, wherein the two drive motors, the two first planetary reducers, and the two shift assemblies are all disposed symmetrically about the first central axis within the drive axle housing, and the shift assemblies are disposed within the drive motors.
10. The coaxial double-motor electric drive axle of claim 1, further comprising a first controller and a second controller, wherein the first controller and the second controller are connected with the two driving motors in a one-to-one correspondence manner, and the first controller and the second controller are respectively used for controlling the rotating speeds of the corresponding driving motors.
CN202310600977.6A 2023-05-25 2023-05-25 Coaxial double-motor electric drive axle Pending CN116572720A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310600977.6A CN116572720A (en) 2023-05-25 2023-05-25 Coaxial double-motor electric drive axle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310600977.6A CN116572720A (en) 2023-05-25 2023-05-25 Coaxial double-motor electric drive axle

Publications (1)

Publication Number Publication Date
CN116572720A true CN116572720A (en) 2023-08-11

Family

ID=87537588

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310600977.6A Pending CN116572720A (en) 2023-05-25 2023-05-25 Coaxial double-motor electric drive axle

Country Status (1)

Country Link
CN (1) CN116572720A (en)

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