Integrated dual-motor dual-gear electric drive axle and vehicle

Abstract

The application relates to new energy automobile transmission technology and discloses an integrated double-motor double-gear electric drive axle and a vehicle, which comprises a first input shaft, a first motor, a first gear, a first gear shifting module and a second gear arranged on the first input shaft; a second input shaft, a second motor, a third gear, a second gear shifting module and a fourth gear arranged on the second input shaft; an output shaft, a plurality of small-diameter planetary gears, a large-diameter planetary gear, a first sun gear, a fifth gear, a second sun gear and a sixth gear arranged on the output shaft, the first sun gear is meshed with each large-diameter planetary gear, the fifth gear is respectively meshed with the first gear and the third gear, the second sun gear is meshed with each small-diameter planetary gear, and the sixth gear is respectively meshed with the second gear and the fourth gear, so that power switching of high and low gears can be realized through the first gear shifting module and the second gear shifting module. The electric drive axle has a simple structure, high integration degree and high power transmission efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to new energy vehicle transmission technology, in particular to an integrated double-motor double-gear electric drive axle and vehicle. BACKGROUND

[0002] At present, the electric drive axle of new energy vehicle is mostly arranged in single-motor single-gear and single-motor double-gear structure, however, the electric drive axle adopts single motor drive, the power is weak, and cannot meet the driving force under different loads, and the driving force can only be evenly distributed to all wheels, and cannot be flexibly adjusted according to specific requirements, and when braking or decelerating, the energy recovery efficiency is low. The electric drive axle with double-motor single-gear can provide higher power and torque output than single-motor system, however, the single-gear has limited adjustment range of speed and torque, and cannot adapt to a wide range of driving conditions and driving requirements. In view of this, a double-motor double-gear electric drive axle is newly developed, which has the advantages of double-motor and double-gear, but the structure of the double-motor double-gear electric drive axle in the prior art is complex, so that the power transmission path is complex, resulting in low power transmission efficiency, and the integration is low, resulting in large volume, which is not conducive to the lightweight of new energy vehicle. SUMMARY

[0003] The technical problem to be solved by the present application is to provide an integrated double-motor double-gear electric drive axle, which has simple structure, high integration and high power transmission efficiency.

[0004] In addition, the technical problem to be solved by the present application is to provide a vehicle with high power performance and high endurance.

[0005] To solve the above technical problems, the application provides an integrated double-motor double-gear electric drive axle, which comprises a first input shaft, a first gear, a first gear shifting module and a second gear arranged on the first input shaft, the first gear shifting module being selectively connected with the first gear and the second gear; a first motor, an output end of the first motor being connected with the first input shaft; a second input shaft, a third gear, a second gear shifting module and a fourth gear arranged on the second input shaft, the second gear shifting module being selectively connected with the third gear and the fourth gear; a second motor, an output end of the second motor being connected with the second input shaft; and an output shaft, a composite planetary gear set, a first sun gear set and a second sun gear set arranged on the output shaft, the composite planetary gear set comprising a plurality of double planetary gears, the double planetary gears comprising small-diameter planetary gears and large-diameter planetary gears, the first sun gear set comprising a first sun gear and a fifth gear, the first sun gear being meshed with each of the large-diameter planetary gears, the fifth gear being meshed with the first gear and the third gear respectively, the second sun gear set comprising a second sun gear and a sixth gear, the second sun gear being meshed with each of the small-diameter planetary gears, the sixth gear being meshed with the second gear and the fourth gear respectively, so that power switching of high and low gears can be realized through the first gear shifting module and the second gear shifting module.

[0006] Preferably, the composite planetary gear set comprises a carrier, an inner ring gear and a plurality of double planetary gears; the small-diameter planetary gears and the large-diameter planetary gears rotate synchronously, and each of the small-diameter planetary gears is meshed with the inner ring gear.

[0007] More preferably, the first sun gear set further comprises a first hollow shaft, one end of the first hollow shaft being connected with the first sun gear and the other end of the first hollow shaft being connected with the fifth gear; the second sun gear set further comprises a second hollow shaft, one end of the second hollow shaft being connected with the second sun gear and the other end of the second hollow shaft being connected with the sixth gear.

[0008] Specifically, the second hollow shaft is rotatably sleeved on the output shaft, and the first hollow shaft is rotatably sleeved on the second hollow shaft.

[0009] Preferably, the first gear and the third gear are the same in tooth number and outer diameter size, the second gear and the fourth gear are the same in tooth number and outer diameter size, and the fifth gear and the sixth gear are the same in tooth number and outer diameter size.

[0010] Preferably, the first motor and the second motor, the first gear and the third gear, the first gear shifting module and the second gear shifting module and the second gear and the fourth gear are symmetrically distributed on two sides of the output shaft.

[0011] Preferably, the first motor, the second motor, the compound planetary gear set, the first sun gear set and the second sun gear are located at the same side of the first gear shifting module and the second gear shifting module.

[0012] Preferably, the output shaft comprises a first output half shaft and a second output half shaft, which are coaxial and extend in opposite directions.

[0013] More preferably, the application further comprises a differential, an input end of which is connected with the compound planetary gear set, and output ends of the differential are respectively connected with the first output half shaft and the second output half shaft.

[0014] Another aspect of the application also provides a vehicle comprising the integrated double-motor double-gear electric drive axle according to any one of the above technical solutions.

[0015] Through the above technical solutions, the integrated double-motor double-gear electric drive axle provided by the application has a simple structure, fewer shafts and parts, and mainly adopts three main shafts. Two motors, two gear shifting mechanisms and corresponding gear transmission parts are respectively arranged at two input shafts, and the gears on the input shafts are meshed with the gears on the output shafts, so as to transmit power to the sun gears and then to the compound planetary gear set for output. The overall structure is compact and has high integration, so that the electric drive axle has small volume and low weight. The double-gear shifting mechanism can realize multiple power modes and balance low-speed high-torque and high-speed economy. The two independent gear shifting mechanisms can further improve the motor output torque and the motor working in the high-efficiency interval, improve the power economy, and control the number of motors participating in the kinetic energy recovery and the corresponding gear position of the kinetic energy recovery, realize multiple kinetic energy recovery modes, and balance the ordinary and other high-power kinetic energy recovery working conditions.

[0016] Other advantages of the application and technical effects of the preferred embodiments will be further described in the specific embodiments below. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application, and are incorporated herein for explanation. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 is a structural schematic diagram of a specific embodiment of the integrated double-motor double-gear electric drive axle of the present application;

[0019] Figure 2 is a transmission diagram of the output of the first gear of the integrated double-motor double-gear electric drive axle of the present application;

[0020] Figure 3 is a schematic diagram of the transmission of the integrated double-motor double-gear electric drive axle of the present application.

[0021] Explanation of reference signs

[0022] 1 - second gear, 2 - first gear, 3 - first gear module, 4 - sixth gear, 5 - fifth gear, 6 - fourth gear, 7 - second gear module, 8 - third gear, 9 - first motor, 10 - inner ring gear, 11 - carrier, 12 - differential, 13 - first sun gear, 14 - second sun gear, 15 - large-diameter planetary gear, 16 - small-diameter planetary gear, 17 - second motor, 18 - first hollow shaft, 19 - second hollow shaft;

[0023] A1 - first input shaft, A2 - second input shaft, B1 - first output half shaft, B2 - second output half shaft. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "arranged", "connected", "installed" should be understood broadly, for example, the connection can be fixed connection, or detachable connection, or integral connection; can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] It should be understood that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.

[0028] Reference Figure 1The application provides an integrated double-motor double-gear electric drive axle, which comprises a first input shaft A1, a first motor 9, a second input shaft A2, a second motor 17 and an output shaft. The first motor 9 can be coaxially arranged with the first input shaft A1 (i.e. the first input shaft A1 is the motor shaft of the first motor 9), or the output shaft of the first motor 9 is connected with the first input shaft A1, so that the first motor 9 can drive the first input shaft A1 to rotate. The connection relationship between the second input shaft A2 and the second motor 17 is the same as that between the first motor 9 and the first input shaft A1, and will not be described here. The first motor 9 and the second motor 17 can be motors of the same type, or motors of different types according to requirements and actual application conditions. The electric drive axle of the application adopts double motors, which is beneficial to reducing the development difficulty of high-power and high-torque motors, reducing the types of motors and facilitating the realization of series expansion of drive axles of different tonnages. The first input shaft A1 is sequentially provided with a first gear 2, a first gear shifting module 3 and a second gear 1 from left to right, wherein the first gear 2 and the second gear 1 are arranged in parallel on the first input shaft A1, the first gear shifting module 3 is connected with the first input shaft A1 through a spline and can slide on the first input shaft A1 to selectively combine with the first gear 2 or the second gear 1, so as to realize the switching of high and low gears. Correspondingly, the connection relationship between the third gear 8, the second gear shifting module 7 and the fourth gear 6 and the second input shaft A2 is the same as above, and will not be described here. The output shaft is provided with a composite planetary gear set, a first sun gear set and a second sun gear set. The composite planetary gear set comprises a plurality of double planetary gears, the double planetary gears comprise small-diameter planetary gears 16 and large-diameter planetary gears 15, the first sun gear set comprises a first sun gear 13 and a fifth gear 5, and the second sun gear set comprises a second sun gear 14 and a sixth gear 4. The first sun gear 13 is engaged with each large-diameter planetary gear 15, and the second sun gear 14 is engaged with each small-diameter planetary gear 16. Thus, through the gear shifting of the first gear shifting module 3 and the second gear shifting module 7, one-stage reduction or two-stage reduction can be selectively realized at the composite planetary gear set and the double sun gears; the fifth gear 5 is engaged with the first gear 2 and the third gear 8 respectively, and the sixth gear 4 is engaged with the second gear 1 and the fourth gear 6 respectively, so that the power of the first motor 9 and the second motor 17 is converged, and one-stage reduction can be realized at the place through the gear shifting of the first gear shifting module 3 and the second gear shifting module 7.

[0029] The first input shaft A1, the second input shaft A2 and the output shaft are parallel arranged, which meets the requirement of transmitting large torque, reduces the requirement of gear size, and reduces the volume of the electric drive axle. Correspondingly, the first motor 9 and the second motor 17 are also symmetrically and parallel arranged, so that the mass center of the motor is close to the shaft center, the impact load capacity of the motor is enhanced, and smaller arrangement space can be achieved. The first shift module 3 and the second shift module 7 are each provided with a shift sleeve, the shift sleeve can slide left and right to engage with the gear on both sides of the shift module, so as to realize the connection between the input shaft and the gear. For example, when the shift sleeve on the first shift module 3 slides to the left to form a power coupling connection (such as meshing or friction transmission) with the first gear 2, the power of the first motor 9 can be transmitted to the first gear 2 through the first input shaft A1, and then transmitted to the fifth gear 5 engaged with the first gear 2, and then sequentially transmitted to the first sun gear 13 and the composite planetary gear set, and then transmitted to the output shaft through the differential 12. When the shift sleeve on the first shift module 3 slides to the right to form a power coupling connection with the second gear 1, the power of the first motor 9 can be transmitted to the second gear 1 through the first input shaft A1, and then transmitted to the sixth gear 4 engaged with the second gear 1, and then sequentially transmitted to the second sun gear 14 and the composite planetary gear set, and then transmitted to the output shaft through the differential 12. Correspondingly, the shift sleeve of the second shift module 7 can slide to the left to engage with the third gear 8, or slide to the right to engage with the fourth gear 6, and the power transmission path is similar to that of the first shift module 3, which will not be described in detail here. On the basis of the above technical solution, parallel shaft reduction gear sets or planetary reduction gear sets can be additionally arranged behind the first motor 9 and the second motor 17 according to requirements, and planetary rows can be additionally arranged on the output shaft or planetary rows can be additionally arranged on the shaft end of the output shaft to meet the reduction requirements of different vehicle models.

[0030] In some embodiments, the composite planetary gear set further comprises a planet carrier 11 and an inner ring gear 10. The inner ring gear 10 described above can be a detachable box structure, and a plurality of small-diameter planetary gears 16 and a second sun gear 14 can be accommodated inside. In a preferred case, the inner ring gear 10 is fixedly supported on the electric drive axle housing, and in addition, the inner ring gear 10 is also rotatably supported on the electric drive axle housing, and the corresponding driving mode can be selected according to the actual use requirements; one end of the planet carrier 11 is connected with a planet shaft, and the other end can be connected with a differential 12, and the differential 12 is connected with an output shaft, and each double planetary gear is respectively sleeved on the corresponding planet shaft, which can revolve around the output shaft with the rotation of the planet carrier 11, and can also revolve around the shaft (i.e. the planet shaft) passing through the center hole of the planet carrier 11 and fixedly connected with the planet carrier 11. The double planetary gear comprises a small-diameter planetary gear 16 and a large-diameter planetary gear 15, and the small-diameter planetary gear 16 and the large-diameter planetary gear 15 rotate synchronously. The small-diameter planetary gear 16 and the large-diameter planetary gear 15 can be fixedly connected or integrally machined as a whole. The small-diameter planetary gear 16 and the large-diameter planetary gear 15 are coaxially arranged on the planet shaft, and each small-diameter planetary gear 16 is engaged with the inner ring gear 10. In a preferred case, the number of double planetary gears is 3, but the number of double planetary gears can be arbitrarily selected according to the actual use requirements, so as to realize different reduction ratios, thereby meeting the speed and power requirements. By adopting the structure of the composite planetary gear set, through the first shifting module 3 and the second shifting module 7, one level of reduction can be realized, and two levels of reduction can also be realized, thereby meeting the different reduction requirements of users. The structure of the composite planetary gear set can also reduce the noise and vibration in the gear transmission process, and reduce the risk of stress concentration and fatigue damage of the gear.

[0031] In some embodiments, the first sun gear set comprises a first hollow shaft 18 and a second hollow shaft 19, one end of the first hollow shaft 18 is connected with the first sun gear 13 through the spline, and the other end is connected with the fifth gear 5 through the spline, one end of the second hollow shaft 19 is connected with the second sun gear 14 through the spline, and the other end is connected with the sixth gear 4 through the spline, and the first hollow shaft 18 and the second hollow shaft 19 are located on the same axis, so that the rotation centers of the first sun gear 13, the fifth gear 5, the second sun gear 14 and the sixth gear 4 are located on the same axis. The first sun gear 13 is engaged with each large-diameter planetary gear 15, the second sun gear 14 is engaged with each small-diameter planetary gear 16, and the small-diameter planetary gear 16 is engaged with the inner ring gear 10. Therefore, the power can be selectively transmitted to the composite planetary gear set through the first sun gear 13 or through the second sun gear 14, thereby realizing two-stage reduction or one-stage reduction on the composite planetary gear set, thereby meeting the different reduction requirements of users. The structure of the double sun gear can optimize the layout of the reduction gear, reduce the number and weight of parts, and is conducive to the integration of the electric drive axle structure; can reduce energy loss and improve transmission efficiency; can also realize different transmission ratios, and meet the use requirements of electric drive axles of different vehicle models and working conditions.

[0032] In some embodiments, the second hollow shaft 19 is rotatably sleeved on the output shaft, and the first hollow shaft 18 is rotatably sleeved on the second hollow shaft 19, so that the structure of the electric drive axle is more compact and the integration is improved.

[0033] In some embodiments, the first gear 2 and the third gear 8 have the same number of teeth and the same outer diameter, the second gear 1 and the fourth gear 6 have the same number of teeth and the same outer diameter, and the fifth gear 5 and the sixth gear 4 have the same number of teeth and the same outer diameter. In addition, in some embodiments, the first gear 2, the second gear 1, the third gear 8 and the fourth gear 6 are completely the same, the fifth gear 5 and the sixth gear 4 have the same tooth shape, the same number of teeth, the same module and the same outer diameter, and preferably, the nominal diameter of the first gear 2, the second gear 1, the third gear 8 and the fourth gear 6 is smaller than the nominal diameter of the fifth gear 5 and the sixth gear 4. Thus, the first speed ratio is the same in the first gear state and the second gear state, and the different speed ratios of the two gears can be controlled by the first sun gear 13, the second sun gear 14 and the composite planetary gear set connected thereto. The use of the same gears in the above embodiments makes the parts of the electric drive axle have strong universality, can save design and mold opening costs, and reduce development costs. In addition, gears of different sizes can also be set according to actual needs to meet different speed ratio requirements.

[0034] In some embodiments, the first motor 9 and the second motor 17, the first gear 2 and the third gear, the first gear shift module 3 and the second gear shift module 7, and the second gear 1 and the fourth gear 6 are symmetrically distributed on both sides of the output shaft, which can reduce the occupation of the chassis space, and the symmetric distribution structure makes the structure of the electric drive axle more compact and balanced.

[0035] In some embodiments, the first motor 9, the second motor 17, the composite planetary gear set, the first sun gear set and the second sun gear 14 are located on the same side of the first gear shift module 3 and the second gear shift module 7, and correspondingly, the sixth gear 4 is located on the other side of the first gear shift module 3 and the second gear shift module 7. The electric drive axle of this embodiment occupies less horizontal space and is more integrated.

[0036] In some embodiments, the output shaft includes a first output half shaft B1 and a second output half shaft B2, and the first output half shaft B1 and the second output half shaft B2 are coaxial and extend in opposite directions. One end of the first output half shaft B1 is connected with the differential 12, and the other end thereof passes through the second hollow shaft 19 and is connected with the right wheel. One end of the second output half shaft B2 is connected with the differential 12, and the other end thereof is connected with the left wheel.

[0037] In some embodiments, the integrated dual-motor dual-gear electric drive axle further comprises a differential 12, an input end of the differential 12 being connected with the compound planetary gear set, and output ends of the differential 12 being respectively connected with the first output half shaft B1 and the second output half shaft B2. A differential lock can be additionally arranged at the differential 12 according to requirements, so as to improve the passing ability of the automobile on complex road surfaces.

[0038] The application further provides a vehicle, which is provided with the integrated dual-motor dual-gear electric drive axle in each of the above embodiments, the motor being integrated with the compound planetary gear set and the sun gear set, so that the weight of the electric drive axle can be reduced, and the vehicle is light in weight, low in energy consumption, high in efficiency and good in space layout optimization. The integrated design of the electric drive axle simplifies the chassis design of the vehicle, saves the chassis space, and the vehicle is good in NVH performance (NVH refers to noise, vibration and sound roughness).

[0039] As a most optimal embodiment, the integrated dual-motor dual-gear electric drive axle of the present application comprises a first input shaft A1, a second input shaft A2, a first output half shaft B1 and a second output half shaft B2. The first output half shaft B1 and the second output half shaft B2 are located on the same axis, the first input shaft A1, the second input shaft A2, the first output half shaft B1 and the second output half shaft B2 are arranged in parallel, and the first input shaft A1 and the second input shaft A2 are symmetrically distributed on the upper and lower sides of the first output half shaft B1 and the second output half shaft B2. The first input shaft A1 is connected with a first motor 9 at the left shaft end, and a first gear 2, a first gear shifting module 3 and a second gear 1 are arranged in sequence from left to right on the first input shaft A1, wherein the first gear 2 and the second gear 1 are sleeved on the first input shaft A1, the first gear shifting module 3 is slidably connected on the first input shaft A1, so as to selectively engage with the first gear 2 or the second gear 1 or be located in the intermediate position without engaging with the first gear 2 or the second gear 1; the second input shaft A2 is connected with a second motor 17 at the left shaft end, and a third gear 8, a second gear shifting module 7 and a fourth gear 6 are arranged in sequence from left to right on the second input shaft A2, wherein the third gear 8 and the fourth gear 6 are sleeved on the second input shaft A2, the second gear shifting module 7 is slidably connected on the second input shaft A2, so as to selectively engage with the third gear 8 or the fourth gear 6 or be located in the intermediate position without engaging with the third gear 8 or the fourth gear 6; the first gear 2 and the third gear 8 are engaged with a fifth gear 5, and the fifth gear is connected with a first sun gear 13 through a first hollow shaft 18; the second gear 1 and the fourth gear 6 are engaged with a sixth gear 4, and the sixth gear 4 is connected with a second sun gear 14 through a second hollow shaft 19; the left shaft end of the first output half shaft B1 is connected with one output end of a differential 12, the second hollow shaft 19 is sleeved on the right shaft segment of the first output half shaft B1, and the first hollow shaft 18 is sleeved on the second hollow shaft 19; the right shaft end of the second output half shaft B2 is connected with the other output end of the differential 12; the input end of the differential 12 is connected with a composite planetary gear set, the composite planetary gear set comprises a plurality of planet carriers 11, a plurality of double planetary gears and an inner ring gear 10, each double planetary gear is sleeved on the planet shaft of the planet carrier 11, and the inner ring gear 10 is fixedly supported on the electric drive axle housing; the double planetary gear comprises a small-diameter planetary gear 16 and a large-diameter planetary gear 15, the small-diameter planetary gear 16 and the large-diameter planetary gear 15 are formed in one body, and each small-diameter planetary gear 16 is engaged with the inner ring gear 10 and the second sun gear 14, and each large-diameter planetary gear 15 is engaged with the first sun gear 13.

[0040] On the basis of the technical scheme of the above optimal embodiment, Figure 2 and Figure 3 , Figure 2 is a transmission diagram of the integrated dual-motor dual-gear electric drive axle outputting one-gear power, Figure 3The transmission diagram of the output power of the two-gear electric drive axle is shown.

[0041] Reference Figure 2 When in the one-gear power output state: the first gear shift module 3 is combined with the first gear 2 by sliding to the left, the second gear shift module 7 is combined with the third gear 8 by sliding to the left, the first motor 9 outputs power to the first input shaft A1, the first input shaft A1 transmits power to the fifth gear 5 through the first gear 2, the second motor 17 outputs power to the second input shaft A2, the second input shaft A2 transmits power to the fifth gear 5 through the third gear 8, thereby achieving one-stage reduction; the fifth gear 5 transmits power to the first hollow shaft 18, the first hollow shaft 18 continues to transmit power to the first sun gear 13 and to the large-diameter planetary gear 15, thereby achieving two-stage reduction, the large-diameter planetary gear 15 transmits power to the small-diameter planetary gear 16, thereby achieving three-stage reduction, and the power is then transmitted to the differential 12 through the planet carrier 11 for differential and power output, the differential 12 distributes power to the first output half shaft B1 and the second output half shaft B2, and finally to the wheels.

[0042] Reference Figure 3 When in the two-gear power output state: the first gear shift module 3 is combined with the second gear 1 by sliding to the right, the second gear shift module 7 is combined with the fourth gear 6 by sliding to the right, the first motor 9 outputs power to the first input shaft A1, the first input shaft A1 transmits power to the sixth gear 4 through the second gear 1, the second motor 17 outputs power to the second input shaft A2, the second input shaft A2 transmits power to the sixth gear 4 through the fourth gear 6, thereby achieving one-stage reduction; the sixth gear 4 transmits power to the second hollow shaft 19, the second hollow shaft 19 continues to transmit power to the second sun gear 14 and to the small-diameter planetary gear 16, thereby achieving two-stage reduction, and the power is then transmitted to the differential 12 through the planet carrier 11 for differential and power output, the differential 12 distributes power to the first output half shaft B1 and the second output half shaft B2, and finally to the wheels.

[0043] When in the neutral state: the first gear shift module 3 is located between the first gear 2 and the second gear 1, the second gear shift module 7 is located between the third gear 8 and the fourth gear 6, and the power transmission path is interrupted at the first input shaft A1 and the second input shaft A2, thereby achieving the neutral function.

[0044] The electric drive axle of the application has a short power transmission path in both gears, so that energy loss in the power transmission process can be effectively reduced, and power transmission efficiency is realized. The simplification of the power transmission path also simplifies the overall structure of the electric drive axle system, thereby reducing the weight of the electric drive axle, which is conducive to vehicle lightweighting, low energy consumption, high efficiency, and space layout optimization. In addition, the simplification of the electric drive axle structure reduces the failure rate of the electric drive axle and reduces the complexity of maintenance and maintenance costs.

[0045] The gear switching process of one gear to two gears is as follows: the first gear shifting module 3 and the second gear shifting module 7 are both located on the left side to continuously output power in the one gear state. At this time, the first gear shifting module 3 is first pushed to the right to rise to the two gears, and the speed of the first motor 9 is adjusted to match the gear shifting action. After the first gear shifting module 3 completes the gear upshift, the second gear shifting module 7 is pushed to the right, and the two gears are engaged to complete the one gear to two gear operation. The above is the case where the first motor 9 corresponds to the first gear shifting module 3 that is first shifted up. Correspondingly, when the second motor 17 corresponds to the second gear shifting module 7 that is first shifted up, the above gear upshift steps are the same.

[0046] The gear switching process of one gear to two gears is as follows: the first gear shifting module 3 and the second gear shifting module 7 are both located on the left side to continuously output power in the one gear state. At this time, the first gear shifting module 3 is first pushed to the right to rise to the two gears, and the speed of the first motor 9 is adjusted to match the gear shifting action. After the first gear shifting module 3 completes the gear upshift, the second gear shifting module 7 is pushed to the right, and the two gears are engaged to complete the one gear to two gear operation. The above is the case where the first motor 9 corresponds to the first gear shifting module 3 that is first shifted up. Correspondingly, when the second motor 17 corresponds to the second gear shifting module 7 that is first shifted up, the above gear upshift steps are the same.

[0047] In the above gear upshift and downshift processes, the first gear shifting module 3, the second gear shifting module 7, the first motor 9, and the second motor 17 work cooperatively to avoid power interruption and jerk during gear shifting, ensure the continuity and comfort of power output, and improve the driving experience of the driver.

[0048] When the vehicle with the electric drive axle of the application is in the power mode: the first motor 9 and the second motor 17 work simultaneously, the first gear shifting module 3 and the second gear shifting module 7 are in the corresponding gear positions; when the first motor 9 works alone, the second gear shifting module 7 is in the neutral position, and the first gear shifting module 3 is in the corresponding gear position (i.e., the first gear shifting module 3 is combined with the first gear 2 on the left side or the first gear shifting module 3 is combined with the second gear 1 on the right side); when the second motor 17 works alone, the first gear shifting module 3 is in the neutral position, and the second gear shifting module 7 is in the corresponding gear position. The two gear shifting modules are independent of each other, and the participation of the motor can be controlled according to the power demand; when a single motor works, the other motor can cut off the power transmission path through the corresponding gear shifting mechanism, so as to avoid mechanical loss and counter electromotive force caused by motor idling and ensure the efficiency of the drive system; when one of the motors fails, the power transmission path of the failed motor can be disconnected through the gear shifting mechanism corresponding to the motor, and the other motor can still continue to output power.

[0049] When the vehicle with the electric drive axle of the application is in the power mode: the first motor 9 and the second motor 17 work simultaneously, the first gear shifting module 3 and the second gear shifting module 7 are in the corresponding gear positions; when the first motor 9 works alone, the second gear shifting module 7 is in the neutral position, and the first gear shifting module 3 is in the corresponding gear position (i.e., the first gear shifting module 3 is combined with the first gear 2 on the left side or the first gear shifting module 3 is combined with the second gear 1 on the right side); when the second motor 17 works alone, the first gear shifting module 3 is in the neutral position, and the second gear shifting module 7 is in the corresponding gear position. The two gear shifting modules are independent of each other, and the participation of the motor can be controlled according to the power demand; when a single motor works, the other motor can cut off the power transmission path through the corresponding gear shifting mechanism, so as to avoid mechanical loss and counter electromotive force caused by motor idling and ensure the efficiency of the drive system; when one of the motors fails, the power transmission path of the failed motor can be disconnected through the gear shifting mechanism corresponding to the motor, and the other motor can still continue to output power.

[0050] The preferred embodiments of the application are described in detail above with reference to the drawings, but the application is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the application within the technical concept of the application, and these simple modifications all belong to the protection scope of the application.

[0051] In addition, it should be noted that each specific technical feature described in the above-described specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the application will not describe various possible combinations again. In addition, various different embodiments of the application can also be combined in any manner, as long as it does not deviate from the technical concept of the application, and it should be considered as disclosed by the application.

Claims

1. An integrated dual-motor dual-speed electric drive axle, characterized in that: include: a first input shaft (A1), on which a first gear (2), a first shift module (3) and a second gear (1) are arranged, and the first shift module (3) is selectively connectable to the first gear (2) and the second gear (1); a first motor (9), wherein an output end of the first motor (9) is connected to the first input shaft (A1); a second input shaft (A2), on which a third gear (8), a second shift module (7) and a fourth gear (6) are arranged, and the second shift module (7) is selectively connectable to the third gear (8) and the fourth gear (6); a second motor (17), wherein an output end of the second motor (17) is connected to the second input shaft (A2); An output shaft is provided with a compound planetary gear set, a first sun gear set, and a second sun gear set. The compound planetary gear set includes a plurality of double-linked planetary gears, the double-linked planetary gears include small-diameter planetary gears (16) and large-diameter planetary gears (15). The first sun gear set includes a first sun gear (13) and a fifth gear (5). The first sun gear (13) is meshed with each of the large-diameter planetary gears (15). The fifth gear (5) is respectively meshed with the first gear (2) and the third gear (8). The second sun gear set includes a second sun gear (14) and a sixth gear (4). The second sun gear (14) is meshed with each of the small-diameter planetary gears (16). The sixth gear (4) is respectively meshed with the second gear (1) and the fourth gear (6). High and low gear power switching can be achieved through the first shift module (3) and the second shift module (7).

2. The integrated dual-motor dual-speed electric drive axle according to claim 1, characterized in that: The compound planetary gear set further comprises a planet carrier (11) and an inner gear ring (10), wherein the planet carrier (11) comprises a plurality of planet shafts, and each of the double-coupled planetary gears is loosely sleeved on the corresponding planet shaft; The small-diameter planetary gear (16) and the large-diameter planetary gear (15) rotate synchronously, and each of the small-diameter planetary gears (16) is meshed with the inner gear ring (10).

3. The integrated dual-motor dual-speed electric drive axle according to claim 2, characterized in that: The first sun gear set further comprises a first hollow shaft (18), one end of the first hollow shaft (18) is connected to the first sun gear (13), and the other end is connected to the fifth gear (5); the second sun gear set further comprises a second hollow shaft (19), one end of the second hollow shaft (19) is connected to the second sun gear (14), and the other end is connected to the sixth gear (4).

4. The integrated dual-motor dual-speed electric drive axle according to claim 3, characterized in that: The second hollow shaft (19) is rotatably sleeved on the output shaft, and the first hollow shaft (18) is rotatably sleeved on the second hollow shaft (19).

5. The integrated dual-motor dual-speed electric drive axle according to claim 4, characterized in that: The first gear (2) and the third gear (8) have the same number of teeth and outer diameter, the second gear (1) and the fourth gear (6) have the same number of teeth and outer diameter, and the fifth gear (5) and the sixth gear (4) have the same number of teeth and outer diameter.

6. The integrated dual-motor dual-speed electric drive axle according to claim 1, characterized in that: The first motor (9) and the second motor (17), the first gear (2) and the third gear, the first shift module (3) and the second shift module (7), and the second gear (1) and the fourth gear (6) are all symmetrically distributed on both sides of the output shaft.

7. The integrated dual-motor dual-speed electric drive axle according to claim 1, characterized in that: The first motor (9), the second motor (17), the compound planetary gear set, the first sun gear set and the second sun gear (14) are all located on the same side of the first shift module (3) and the second shift module (7).

8. The integrated dual-motor dual-speed electric drive axle according to claim 1, characterized in that: The output shaft includes a first output half shaft (B1) and a second output half shaft (B2), wherein the first output half shaft (B1) and the second output half shaft (B2) are coaxial and extend in opposite directions.

9. The integrated dual-motor dual-speed electric drive axle according to claim 8, characterized in that: It also includes a differential (12), the input end of the differential (12) is connected to the compound planetary gear set, and the output end of the differential (12) is respectively connected to the first output half shaft (B1) and the second output half shaft (B2).

10. A vehicle, characterized in that: An integrated dual-motor dual-speed electric drive axle comprising any one of claims 1 to 9.

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