Single motor coaxial two-speed electric drive axle structure

Abstract

A single-motor, coaxial, two-speed electric drive axle structure is provided, comprising: a drive motor; a reduction planetary gearset; a second hollow shaft; a clutch; a brake; a dual-planetary gearset; and a compound planetary gearset differential. After the reduction planetary gearset has decelerated, a high- and low-speed switching clutch is incorporated into the dual-planetary gearset, minimizing the speed difference between the planetary gearset components during shifting and improving the lifespan of the clutch and brake. The dual-planetary gearset design also reduces the ratio between high and low gear ratios, minimizing shift shock and improving vehicle comfort.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle transmission, and in particular to a single-motor coaxial two-speed electric drive axle structure. Background Art

[0002] Electric-powered new energy vehicles are a global trend and future development direction. Drive axles, as a common transmission mechanism, are widely used in the transmission field of machinery and vehicles. To adapt to the development of new energy vehicle technology, electric drive axles driven by drive motors have emerged. Most electric drive axles on the market are single-speed electric drive axles, which have high energy consumption and cannot meet complex speed requirements. Two-speed electric drive axles on the market are complex, have an incompact internal structure, are costly, and are bulky, making them difficult to arrange within limited installation space. Furthermore, they offer poor shifting comfort.

[0003] Therefore, it is necessary to study a single-motor coaxial two-speed electric drive axle structure to solve one or more of the above-mentioned technical problems. Summary of the Invention

[0004] To solve at least one of the above technical problems, according to one aspect of the present invention, a single-motor coaxial two-speed electric drive axle structure is provided, which is characterized by comprising:

[0005] A driving motor having an output shaft, wherein the output shaft is a first hollow shaft;

[0006] A reduction planetary gear, comprising a first sun gear, a first planet gear, a first planet carrier and a first ring gear, wherein the first sun gear is connected to the first hollow shaft, and the first ring gear is connected to the drive axle housing;

[0007] a second hollow shaft, coaxially arranged with the first hollow shaft, wherein the first planet carrier is connected to the second hollow shaft;

[0008] a clutch, a first end of which is connected to the second hollow shaft;

[0009] a brake, two ends of which are respectively connected to the second end of the clutch and the drive axle housing;

[0010] a double-star planetary gear, comprising a second sun gear, a second planet gear, a third planet gear, a second planet carrier, and a second ring gear, wherein the second planet carrier is connected to the second end of the clutch and the brake, and the second sun gear is connected to the second hollow shaft; and

[0011] A compound planetary gear differential includes a differential case, a first output half shaft, a second output half shaft, a third sun gear, a fourth planetary gear, a fourth sun gear and a fifth planetary gear. The third sun gear is connected to the first output half shaft, the fourth sun gear is connected to the second output half shaft, the fourth planetary gear and the fifth planetary gear are connected to the differential case and are externally meshed with each other, the fourth planetary gear is meshed with the third sun gear, and the fifth planetary gear is meshed with the fourth sun gear. The second ring gear is connected to the differential case through a third hollow shaft, and the third hollow shaft is coaxial with the second hollow shaft. The first output half shaft passes through the third hollow shaft, the second hollow shaft, the first hollow shaft and the center through hole set on the drive motor in sequence and then outputs. The second output half shaft is coaxial with the first output half shaft and has an output direction opposite to that of the first output half shaft.

[0012] According to another aspect of the present invention, the single-motor coaxial two-speed electric drive axle structure further includes a differential lock, one end of which is connected to the differential housing and the other end is connected to the second output half-shaft.

[0013] According to yet another aspect of the present invention, the second sun gear meshes with the second planet gears, the second planet gears mesh with the third planet gears, and the third planet gears mesh with the second ring gear.

[0014] According to yet another aspect of the present invention, the clutch and the brake are replaced by a synchronous gear sleeve, and the second planet carrier is selectively connected to the second sun gear or the drive axle housing through the synchronous gear sleeve.

[0015] According to yet another aspect of the present invention, the third hollow shaft, the second hollow shaft, and the first hollow shaft are sequentially spaced apart in the first direction.

[0016] According to another aspect of the present invention, the differential lock, the fourth sun gear, the third sun gear, the double-star planetary gear, the clutch, the reduction planetary gear and the drive motor are arranged in sequence along the first direction.

[0017] According to yet another aspect of the present invention, the clutch and the brake are arranged sequentially in a direction perpendicular to the second hollow shaft.

[0018] According to another aspect of the present invention, the third sun gear and the fourth planet gear are sequentially arranged along a direction perpendicular to the first output semi-shaft, and the fourth sun gear and the fifth planet gear are sequentially arranged along a direction perpendicular to the second output semi-shaft.

[0019] According to yet another aspect of the present invention, the binary planetary gear set is arranged perpendicular to the second hollow shaft, and the reduction planetary gear set is arranged perpendicular to the first hollow shaft.

[0020] According to yet another aspect of the present invention, the second sun gear, the clutch, and the first planet carrier are sequentially connected to the second hollow shaft along a first direction.

[0021] The present invention can achieve one or more of the following technical effects:

[0022] 1. The original bevel gear structure of the drive axle is simplified, reducing the space requirement for vehicle layout;

[0023] 2. The two gears are set after the reduction planetary gear connected to the motor. The speed of the motor is reduced after passing through the reduction planetary gear, making the shifting process of the two gears smoother and greatly improving the comfort;

[0024] 3. A high-speed and low-speed switching clutch is designed at the dual-star planetary gearbox, which reduces the speed difference of the planetary gearbox components during gear shifting and improves the life of the clutch and brake;

[0025] 4. The design of the double planetary gearbox reduces the ratio between high and low gear ratios, reduces the impact of gear shifting, and improves vehicle comfort;

[0026] 5. The single-motor coaxial two-speed electric drive axle structure has been simplified and made more compact, achieving lower cost and higher performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 The figure is a schematic diagram of the structure of a single-motor coaxial two-speed electric drive axle according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0029] The best mode of implementation of the present invention will be described below through preferred embodiments in conjunction with the accompanying drawings. The specific embodiments herein are intended to illustrate the present invention in detail and should not be construed as limiting the present invention. Various variations and modifications may be made without departing from the spirit and substantial scope of the present invention, and all of these should be included within the scope of protection of the present invention.

[0030] Example 1

[0031] According to a preferred embodiment of the present invention, see Figure 1 , provides a single-motor coaxial two-speed electric drive axle structure 300, characterized by including:

[0032] The driving motor 301 has an output shaft, which is a first hollow shaft;

[0033] A reduction planetary gear, comprising a first sun gear 302, first planetary gears 303, a first planet carrier 304 and a first ring gear 305, wherein the first sun gear 302 is connected to the first hollow shaft, and the first ring gear 305 is connected to the drive axle housing;

[0034] A second hollow shaft is coaxially arranged with the first hollow shaft, and the first planet carrier 304 is connected to the second hollow shaft;

[0035] a clutch 306 , a first end of which is connected to the second hollow shaft;

[0036] a brake 307, both ends of which are connected to the second end of the clutch 306 and the drive axle housing respectively;

[0037] a double-star planetary gear, comprising a second sun gear 308, second planetary gears 309, third planetary gears 310, a second planetary carrier 311 and a second ring gear 312, wherein the second planetary carrier 311 is connected to the second end of the clutch 306 and the brake 307, and the second sun gear 308 is connected to the second hollow shaft; and

[0038] The compound planetary gear differential includes a differential case, a first output half shaft 319, a second output half shaft 318, a third sun gear 313, a fourth planetary gear 314, a fourth sun gear 316, and a fifth planetary gear 315. The third sun gear 313 is connected to the first output half shaft 319, the fourth sun gear 316 is connected to the second output half shaft 318, the fourth planetary gear 314 and the fifth planetary gear 315 are connected to the differential case and are externally meshed with each other. The fourth planetary gear 314 meshes with the third sun gear 313, and the fifth planetary gear 315 meshes with the fourth sun gear 316. The second ring gear 312 is connected to the differential case via a third hollow shaft, which is coaxial with the second hollow shaft. The first output half shaft 319 passes through the third hollow shaft, the second hollow shaft, the first hollow shaft, and the center through hole provided on the drive motor 301 in sequence for output. The second output half shaft 318 is coaxial with the first output half shaft 319 and has opposite output directions.

[0039] According to another preferred embodiment of the present invention, the single-motor coaxial two-speed electric drive axle structure further includes a differential lock 317 , one end of which is connected to the differential housing, and the other end is connected to the second output half shaft 318 .

[0040] According to another preferred embodiment of the present invention, the second sun gear 308 meshes with the second planetary gears 309 , the second planetary gears 309 mesh with the third planetary gears 310 , and the third planetary gears 310 mesh with the second ring gear 312 .

[0041] According to another preferred embodiment of the present invention, the clutch 306 and the brake 307 are replaced by a synchronous sleeve, and the second planet carrier 311 is selectively connected to the second sun gear 308 or the drive axle housing through the synchronous sleeve.

[0042] According to another preferred embodiment of the present invention, the third hollow shaft, the second hollow shaft, and the first hollow shaft are sequentially arranged at intervals in the first direction.

[0043] According to another preferred embodiment of the present invention, the differential lock 317 , the fourth sun gear 316 , the third sun gear 313 , the double planetary gear set, the clutch 306 , the reduction planetary gear set and the drive motor 301 are sequentially arranged along the first direction.

[0044] According to another preferred embodiment of the present invention, the clutch 306 and the brake 307 are arranged sequentially in a direction perpendicular to the second hollow shaft.

[0045] According to another preferred embodiment of the present invention, the third sun gear 313 and the fourth planet gear 314 are arranged in sequence along a direction perpendicular to the first output half shaft 319 , and the fourth sun gear 316 and the fifth planet gear 315 are arranged in sequence along a direction perpendicular to the second output half shaft 318 .

[0046] According to another preferred embodiment of the present invention, the binary planetary gear set is arranged perpendicular to the second hollow shaft, and the reduction planetary gear set is arranged perpendicular to the first hollow shaft.

[0047] According to another preferred embodiment of the present invention, the second sun gear 308 , the clutch 306 and the first planet carrier 304 are sequentially connected to the second hollow shaft along the first direction.

[0048] According to another preferred embodiment of the present invention, a coaxial two-speed electric drive axle structure is provided, comprising a drive motor 301, a two-speed planetary reduction mechanism, and a planetary differential. The output shaft of the drive motor 301 is connected to the input end of the two-speed planetary reduction mechanism, which in turn is connected to the input end of the planetary differential. The planetary differential includes two output ends, one of which is connected to a left output axle and the other to a right output axle. The output shaft of the drive motor 301 is a hollow shaft, and the output end of the right output axle extends through the hollow shaft and through the drive motor 301 to the other end of the drive motor 301. The left output axle and the right output axle are arranged in opposite directions, with their axes co-located.

[0049] Advantageously, the present invention realizes two deceleration gears by manipulating the planetary gear clutch 306 and the planetary gear brake 307, and then realizes stepless speed change by coordinating the output speed range of the drive motor 301. The two output half shafts are coaxially arranged. The small size of the planetary gear differential can make the axial structure compact. The coaxial arrangement can meet the requirements of lightweight system and is easy to arrange and install.

[0050] Preferably, the differential includes two output ends connected to the left and right output half-shafts respectively, which can realize the torque distribution requirements of the left and right wheels when the vehicle is driving on different road surfaces. The differential can also be installed with a differential lock 317 to meet the driving requirements of the vehicle on difficult and complex roads.

[0051] Preferably, the drive motor 301 can be combined with a two-speed reducer to form an electric drive system with two gears, thereby reducing the system's energy consumption and improving the system's economy. The present invention can switch the transmission route through the clutch 306 or the brake 307 to enable the reduction mechanism to achieve two reduction gears. It can also use a synchronous gear sleeve to switch the connection relationship between the planetary gear frame and the planetary gear sun gear or housing to achieve high and low gear switching and thus match the output speed range of the drive motor 301 to achieve stepless speed change. The two output half shafts are interconnected using a differential. In terms of the overall vehicle layout, the original bevel gear structure of the drive axle is simplified to a combination of a reduction planetary gear and a double-star planetary gear, reducing the space requirements of the overall vehicle layout and realizing independent distributed drive of the front and rear axles of the vehicle.

[0052] According to another preferred embodiment of the present invention, a coaxial two-speed electric drive axle structure is further provided, characterized in that it includes a drive motor 301, a two-speed planetary reduction mechanism and a planetary differential, the output shaft of the drive motor 301 is connected to the reduction planetary sun gear of the two-speed planetary reduction mechanism, the output end of the two-speed planetary reduction mechanism is connected to the input end of the planetary differential, and the planetary differential includes two output ends, one output end of the planetary differential is connected to the left output half shaft, and the other output end is connected to the right output half shaft;

[0053] The output shaft of the drive motor 301 is a hollow shaft, and the free end of the right output half shaft passes through the hollow shaft and penetrates the drive motor 301 to be arranged at the other end of the drive motor 301; of course, this solution can also be arranged in a mirror image, with the result that the free end of the left output half shaft passes through the hollow shaft and penetrates the drive motor 301 to be arranged at the other end of the drive motor 301;

[0054] The right output half shaft and the left output half shaft are arranged in opposite directions and their axes are located on the same straight line.

[0055] Preferably, the sun gear of the reduction planetary set is connected to the motor, the ring gear of the reduction planetary set is connected to the drive axle housing, and the frame of the reduction planetary set is connected to the sun gear of the dual-star planetary set. The frame of the dual-star planetary set can be connected to the sun gear of the dual-star planetary set via a clutch 306, or connected to the drive axle housing via a brake 307. One end of the clutch 306 is fixedly connected to the sun gear of the dual-star planetary set, and the other end is fixedly connected to the frame of the dual-star planetary set. One end of the brake 307 is fixedly connected to the frame of the dual-star planetary set, and the other end is fixedly connected to the drive axle housing.

[0056] Preferably, the planetary gear differential includes a compound planetary gear differential and a differential lock 317. The compound planetary gear differential comprises two sun gears, two planetary gears, and a differential housing. The two sun gears of the compound planetary gear differential are connected to the left and right output axles, respectively. The two planetary gears mesh with the two sun gears, respectively. The two planetary gears share a differential housing and mesh with each other externally to form the meshing teeth of the compound planetary gear differential. The type of the differential and differential lock 317 can be selected according to user needs. One output of the differential is connected to the left output axle, and the other output of the differential is connected to the right output axle.

[0057] Preferably, the two-speed planetary reduction mechanism includes a reduction planetary gear, a double-star planetary gear, a clutch 306 and a brake 307. The sun gear of the reduction planetary gear is connected to the motor, the ring gear of the reduction planetary gear is connected to the drive axle housing, the frame of the reduction planetary gear is connected to the sun gear of the double-star planetary gear, the frame of the double-star planetary gear can be connected to the sun gear of the double-star planetary gear through the clutch 306, and the frame of the double-star planetary gear can also be connected to the drive axle housing through the brake 307.

[0058] Preferably, the two planetary gears of the double-star planetary train are meshed with the sun gear and the ring gear respectively, and the two planetary gears of the double-star planetary train are also meshed with each other.

[0059] Preferably, the planetary gear differential includes a compound planetary gear differential and a differential lock 317. The compound planetary gear differential includes two sun gears, two planetary gears, and a differential frame. The two sun gears of the compound planetary gear are respectively connected to the left output half shaft and the right output half shaft. The two planetary gears are respectively engaged with the two sun gears. The two planetary gears share a frame and are externally engaged with each other to form the external meshing teeth of the compound planetary gear.

[0060] Advantageously, the present invention achieves two reduction gears by providing a two-stage speed reducer, thereby matching the output speed range of the drive motor to achieve continuously variable speed change. Furthermore, utilizing the drive motor space to connect the right output half-shaft to the right output shaft through the motor center, this saves axial space for the entire electric drive axle and facilitates its overall layout. Furthermore, the use of a dual-planetary gearbox reduces the ratio between the two speeds, effectively utilizing the motor's high-efficiency zone, reducing energy losses in the electric drive axle and improving its economic efficiency.

[0061] According to another preferred embodiment of the present invention, a coaxial two-speed electric drive axle structure is provided, comprising a drive motor 301, a two-speed planetary reduction mechanism, and a planetary gear differential. The two-speed planetary reduction mechanism comprises a reduction planetary gear, a dual-star planetary gear, a clutch 306, and a brake 307. The reduction planetary gear comprises a reduction planetary gear sun gear 302, a reduction planetary gear 303, a reduction planetary gear ring gear 305, and a reduction planetary gear frame 304. The dual-star planetary gear comprises a dual-star planetary gear sun gear 308, a dual-star planetary gear A 309, a dual-star planetary gear B 310, a dual-star planetary gear frame 311, and a dual-star planetary gear ring gear 312. The differential comprises a differential sun gear A 313, a differential planetary gear A 314, a differential planetary gear B 315, and a differential sun gear B 316.

[0062] The output shaft of the drive motor 301 is connected to the reduction planetary gear sun gear 302, the reduction planetary gear 303 is connected to the double planetary gear sun gear 308 through the reduction planetary gear frame 304, and the reduction planetary gear ring 305 is connected to the drive axle housing; the double planetary gear sun gear 308 is meshed with the double planetary gear A 309 and the double planetary gear B 310 in sequence, and the double planetary gear ring 312 outputs power to the differential housing; the double planetary gear frame 311 can be connected to the double planetary gear sun gear 308 through the clutch 306 to form the high gear of the two-speed reduction mechanism; the double planetary gear frame 311 can also be connected to the drive axle housing through the brake 307 to form the low gear of the two-speed reduction mechanism; when the clutch 306 and the brake 307 are not engaged, the two-speed reduction mechanism is in neutral.

[0063] The differential housing transmits power to differential planetary gears A 314 and B 315. Through gear meshing, the power can be transmitted to differential sun gears A 313 and B 316, respectively. Differential sun gear A 313 is connected to the right output half-shaft 319, and differential sun gear B 315 is connected to the left output half-shaft 318. The differential planetary gears A 314 and B 315 mesh with each other, forming a torque circuit for the left and right output half-shafts, thereby realizing the function of the differential.

[0064] Preferably, in this embodiment, in order to save the overall layout space of the drive axle, the output shaft of the drive motor 301 is a hollow shaft, and the free end of the right output half shaft 319 passes through the hollow shaft and extends through the drive motor to the other end of the drive motor. At the same time, the left output half shaft 318 and the right output half shaft 319 are set in opposite directions and the centers of the two half shafts are located on the same straight line.

[0065] Preferably, in this embodiment, the differential lock 317 adopts a wet clutch differential lock, and in other embodiments, a common end face differential lock may also be adopted.

[0066] Preferably, in this example, the clutch 306 and the brake 307 are respectively combined to form two working gears of the binary planetary gear set. When the clutch 306 is combined and the brake 307 is disengaged, the power of the drive motor 301 is transmitted to the binary planetary gear set sun gear 308 through the reduction planetary gear set frame 304, the binary planetary gear set frame 311 is separated from the drive axle housing, the binary planetary gear set is in a working state of overall rotation, and the reduction mechanism is in high gear; when the clutch 306 is disengaged and the brake 307 is combined, the power of the drive motor 301 is transmitted to the binary planetary gear set sun gear 308 through the reduction planetary gear set frame 304, the binary planetary gear set frame 311 is combined with the drive axle housing, the binary planetary gear set is in a deceleration working state, and the reduction mechanism is in low gear; the binary planetary gear set ring 312 is always connected to the differential housing.

[0067] Preferably, the drive motor converts electrical energy into mechanical energy, which is then converted through a two-speed planetary reduction mechanism and then fed into a planetary differential. This planetary differential is implemented using a compound planetary gearset without a ring gear. This planetary differential, through gear matching, can achieve a 1:1 torque output between the left and right wheels in a compact space, meeting the vehicle's requirement for consistent power output on different road surfaces. The planetary differential can be locked via differential lock 317, meeting the vehicle's need for escape on difficult surfaces. Power can also be transferred in reverse within the two-speed electric drive axle system, with energy recovered by the drive motor 301 to improve the vehicle's energy efficiency.

[0068] Preferably, during implementation, the clutch 306 and the brake 307 may be replaced with a synchronous gear sleeve to achieve high- and low-gear switching.

[0069] The present invention can achieve one or more of the following technical effects:

[0070] 1. The original bevel gear structure of the drive axle is simplified, reducing the space requirement for vehicle layout;

[0071] 2. The two gears are set after the reduction planetary gear connected to the motor. The speed of the motor is reduced after passing through the reduction planetary gear, making the shifting process of the two gears smoother and greatly improving the comfort;

[0072] 3. A high-speed and low-speed switching clutch is designed at the dual-star planetary gearbox, which reduces the speed difference of the planetary gearbox components during gear shifting and improves the life of the clutch and brake;

[0073] 4. The design of the double planetary gearbox reduces the ratio between high and low gear ratios, reduces the impact of gear shifting, and improves vehicle comfort;

[0074] 5. The single-motor coaxial two-speed electric drive axle structure has been simplified and made more compact, achieving lower cost and higher performance.

[0075] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various modifications and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such modifications and improvements are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single motor coaxial two-speed electric drive axle structure, characterized by include: A driving motor having an output shaft, wherein the output shaft is a first hollow shaft; A reduction planetary gear, comprising a first sun gear, a first planet gear, a first planet carrier and a first ring gear, wherein the first sun gear is connected to the first hollow shaft, and the first ring gear is connected to the drive axle housing; a second hollow shaft, coaxially arranged with the first hollow shaft, wherein the first planet carrier is connected to the second hollow shaft; a clutch, a first end of which is connected to the second hollow shaft; a brake, two ends of which are respectively connected to the second end of the clutch and the drive axle housing; a double-star planetary gear, comprising a second sun gear, a second planet gear, a third planet gear, a second planet carrier, and a second ring gear, wherein the second planet carrier is connected to the second end of the clutch and the brake, and the second sun gear is connected to the second hollow shaft; as well as A compound planetary gear differential includes a differential case, a first output half shaft, a second output half shaft, a third sun gear, a fourth planetary gear, a fourth sun gear and a fifth planetary gear. The third sun gear is connected to the first output half shaft, the fourth sun gear is connected to the second output half shaft, the fourth planetary gear and the fifth planetary gear are connected to the differential case and are externally meshed with each other, the fourth planetary gear is meshed with the third sun gear, and the fifth planetary gear is meshed with the fourth sun gear. The second ring gear is connected to the differential case through a third hollow shaft, and the third hollow shaft is coaxial with the second hollow shaft. The first output half shaft passes through the third hollow shaft, the second hollow shaft, the first hollow shaft and the center through hole set on the drive motor in sequence and then outputs. The second output half shaft is coaxial with the first output half shaft and has an output direction opposite to that of the first output half shaft.

2. The single-motor coaxial two-speed electric drive axle structure according to claim 1 is characterized in that A differential lock is also included, one end of the differential lock is connected to the differential housing, and the other end is connected to the second output half shaft.

3. The single-motor coaxial two-speed electric drive axle structure according to claim 1 is characterized in that The second sun gear meshes with the second planet gears, the second planet gears mesh with the third planet gears, and the third planet gears mesh with the second ring gear.

4. The single-motor coaxial two-speed electric drive axle structure according to any one of claims 1 to 3, characterized in that The clutch and the brake are replaced by a synchronous gear sleeve, and the second planet carrier is selectively connected to the second sun gear or the drive axle housing through the synchronous gear sleeve.

5. The single-motor coaxial two-speed electric drive axle structure according to claim 4 is characterized in that The third hollow shaft, the second hollow shaft, and the first hollow shaft are sequentially arranged at intervals in the first direction.

6. The single-motor coaxial two-speed electric drive axle structure according to claim 2 is characterized in that The differential lock, the fourth sun gear, the third sun gear, the double-star planetary gear, the clutch, the reduction planetary gear and the drive motor are arranged in sequence along the first direction.

7. The single-motor coaxial two-speed electric drive axle structure according to claim 6 is characterized in that The clutch and the brake are arranged sequentially in a direction perpendicular to the second hollow shaft.

8. The single-motor coaxial two-speed electric drive axle structure according to claim 7 is characterized in that The third sun gear and the fourth planet gear are sequentially arranged along a direction perpendicular to the first output semi-shaft, and the fourth sun gear and the fifth planet gear are sequentially arranged along a direction perpendicular to the second output semi-shaft.

9. The single-motor coaxial two-speed electric drive axle structure according to claim 4 is characterized in that The double-star planetary gear set is arranged perpendicular to the second hollow shaft, and the reduction planetary gear set is arranged perpendicular to the first hollow shaft.

10. The single-motor coaxial two-speed electric drive axle structure according to claim 9 is characterized in that The second sun gear, the clutch and the first planet carrier are sequentially connected to the second hollow shaft along a first direction.

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