Coaxial multi-gear electric drive axle system and vehicle

Abstract

The utility model relates to a coaxial multi-gear electric drive axle system and a vehicle. The coaxial multi-gear electric drive axle system comprises a motor, a parallel shaft transmission mechanism, a first gear shifting mechanism, a planet row assembly and a second gear shifting mechanism. The parallel shaft transmission mechanism comprises an input shaft, a middle shaft and a sun wheel shaft; the input shaft is in transmission connection with the motor and the intermediate shaft. The output end of the input shaft is further provided with a first combination gear capable of being in transmission connection with the first gear shifting mechanism. The output end of the intermediate shaft is in transmission connection with the first driven gear, the output end of the first driven gear is provided with a second combination tooth and a third combination tooth, the second combination tooth can be in transmission connection with the first gear shifting mechanism, and the third combination tooth can be in transmission connection with the second gear shifting mechanism; the input end of the sun wheel shaft is provided with a first gear shifting mechanism. The sun wheel shaft is in transmission connection with the planet row assembly. The planet row transmission assembly comprises a planet carrier, and a second gear shifting mechanism is arranged at the input end of the planet carrier. Transmission of three forward gears is achieved through cooperation of the first gear shifting mechanism and the second gear shifting mechanism.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle power system technical field especially relates to a coaxial formula multi -notch electric drive axle system and vehicle. BACKGROUND

[0002] In the field of pure electric drive automobile, the transmission efficiency and structural design of electric drive axle system directly affect the vehicle performance. Among the electric drive axle systems on the market, there is a kind of gear shifting scheme adopting two-stage planetary gear train combined with clutch and brake, such as the "two-gear coaxial electric drive axle" disclosed in Chinese patent document CN115027256A. This scheme realizes the transmission of two gears through the gear shifting mode of two clutches and a brake. Although this design can realize the basic gear shifting function, it has many limitations: first, the two-stage planetary gear train structure adopted has high manufacturing difficulty, resulting in high production cost; second, this scheme can only realize two-gear transmission, which is difficult to meet the diversified demand for transmission ratio of vehicles under different working conditions; third, its structure is relatively complex, which is not conducive to the compactness of overall arrangement.

[0003] Therefore, the industry urgently needs an electric drive axle system with simple structure, low manufacturing cost and multiple gear transmission to meet the efficient operation demand of pure electric vehicles under different working conditions. UTILITY MODEL CONTENTS

[0004] The utility model discloses a coaxial formula multi -notch electric drive axle system and vehicle, aim at solving the technical problem in prior art.

[0005] The utility model adopts the following technical scheme:

[0006] On the one hand, the utility model embodiment provides a coaxial formula multi -notch electric drive axle system, and this system includes motor, parallel shaft transmission mechanism, first gear shifting mechanism, planetary gear train assembly and second gear shifting mechanism;

[0007] Parallel shaft transmission mechanism includes input shaft, intermediate shaft and sun gear shaft;

[0008] The input shaft is respectively connected with the motor and the intermediate shaft, and the output end of the input shaft is also provided with the first combination tooth that can be connected with the first gear shifting mechanism;

[0009] The output end of the intermediate shaft is connected with the first driven gear, and the output end of the first driven gear is provided with the second combination tooth and the third combination tooth, the second combination tooth can be connected with the first gear shifting mechanism, and the third combination tooth can be connected with the second gear shifting mechanism;

[0010] The input end of the sun gear shaft is provided with the first gear shifting mechanism, and the sun gear shaft is connected with the planetary gear train assembly;

[0011] The planetary gear assembly comprises a planet carrier, and a second shift mechanism is arranged at an input end of the planet carrier;

[0012] Through cooperation of the first shift mechanism and the second shift mechanism, transmission of three forward gears is realized.

[0013] As a preferred technical solution, a constant mesh gear and a first driving gear are fixedly arranged on the intermediate shaft, the constant mesh gear is engaged with the input shaft to realize transmission connection between the input shaft and the intermediate shaft, and the first driving gear is engaged with the first driven gear.

[0014] As a preferred technical solution, the first driven gear is sleeved on the sun shaft, the second engaging tooth and the third engaging tooth are fixedly arranged on the first driven gear, the second engaging tooth is arranged close to the first shift mechanism, and the third engaging tooth is arranged close to the second shift mechanism.

[0015] As a preferred technical solution, the first shift mechanism comprises a first shift actuator, a first shift fork, a first tooth hub and a first tooth sleeve, the first tooth hub is fixedly arranged on the sun shaft, the first tooth sleeve is axially slidable along the first tooth hub, and the first tooth sleeve can selectively engage with the first engaging tooth or the second engaging tooth.

[0016] As a preferred technical solution, the second shift mechanism comprises a second shift actuator, a second shift fork, a second tooth hub and a second tooth sleeve, the second tooth hub is fixedly arranged on the planet carrier, the second tooth sleeve is axially slidable along the second tooth hub, and the second tooth sleeve can selectively engage with the third engaging tooth.

[0017] As a preferred technical solution, the planetary gear assembly further comprises a ring gear, a sun gear and a planet gear, the sun gear is in transmission connection with the sun shaft, the planet gear is arranged on the planet carrier, and the planet carrier is fixedly connected with the differential assembly.

[0018] As a preferred technical solution, when in the first gear transmission state, the first tooth sleeve engages with the second engaging tooth, and the second tooth sleeve is separated from the third engaging tooth.

[0019] As a preferred technical solution, when in the second gear transmission state, the first tooth sleeve remains engaged with the second engaging tooth, and the second tooth sleeve engages with the third engaging tooth.

[0020] As a preferred technical solution, when in the third gear transmission state, the first tooth sleeve engages with the first engaging tooth, and the second tooth sleeve is separated from the third engaging tooth.

[0021] In another aspect, the utility model embodiment further provides a vehicle, and the vehicle comprises the coaxial type multi-gear electric drive axle system.

[0022] The above-mentioned embodiment of the utility model has the following advantages or beneficial effects:

[0023] The utility model mainly provides a coaxial formula multi -notch electric drive axle system and the vehicle who is provided with the electric drive axle system compared with prior art, the electric drive axle system of utility model embodiment can realize the switching of three gears through setting two gear shifting mechanism, to satisfy the drive demand under different working conditions. One gear is used for low speed big torque working condition, two gears are used for medium speed working condition, three gears are used for high speed working condition, effectively expand the speed ratio coverage of system.

[0024] Further, the gear transmission mechanism and planetary row assembly in the utility model embodiment adopt coaxial arrangement mode, compact structure, high transmission efficiency, through the meshing relationship of the toothed sleeve and the combination tooth of two gear shifting mechanism, realize the smooth switching between three gears, avoid gear shifting impact, improve the whole vehicle driving comfort.

[0025] Compared with single gear or double gear electric drive axle in prior art, the utility model not only improves transmission efficiency, but also reduces the manufacturing cost and maintenance cost of system. Meanwhile, the system has good universality and adaptability, can be widely applied to different types of new energy vehicles, and has important significance for promoting the development of new energy vehicle industry. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme of the utility model embodiment, the drawings needed to be used in the embodiment description will be briefly introduced as follows, which constitutes a part of the utility model, the schematic embodiment of the utility model and its explanation explain the utility model, and do not constitute improper limitation to the utility model. In the drawings:

[0027] Figure 1 The coaxial formula multi -notch electric drive axle system structure schematic view provided for one embodiment of the utility model;

[0028] Figure 2 The power flow schematic view of one gear drive state provided for one embodiment of the utility model;

[0029] Figure 3 The power flow schematic view of two gear drive state provided for one embodiment of the utility model;

[0030] Figure 4 The power flow schematic view of three gear drive state provided for one embodiment of the utility model.

[0031] EXPLANATION OF REFERENCE NUMERALS:

[0032] Motor 11, input shaft 12, first coupling gear 13, intermediate shaft 14, always meshing gear 15, first driving gear 16, first driven gear 17, second coupling gear 18, third coupling gear 19, first shift actuator 21, first shift fork 22, first tooth sleeve 23, first tooth hub 24, sun shaft 31, sun gear 32, first planetary gear 33, second planetary gear 34, carrier 35, ring gear 36, second shift actuator 41, second shift fork 42, second tooth sleeve 43, second tooth hub 44, differential assembly 51, left wheel end 61, right wheel end 62. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the utility model clearer, the following will combine the utility model embodiment and corresponding drawings to make the utility model technical scheme clear and complete. In the description of the utility model, it should be pointed out that the term "or" is usually used in the meaning of including "and / or", unless the content is explicitly indicated otherwise.

[0034] In the description of the present application, the terms "first", "second" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0035] Obviously, the described embodiments are only part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0036] In the field of traditional pure electric heavy commercial vehicles, the existing electric drive axle systems are mostly single-gear or double-gear structures, which are difficult to meet the diversified needs of speed and torque of vehicles under different working conditions. Among them, the single-gear electric drive axle system is simple in structure but has fixed speed ratio, and it is difficult to obtain ideal driving effect under low-speed high-torque and high-speed working conditions. Although the double-gear electric drive axle system improves the driving performance to some extent, the speed ratio coverage is still limited, and the existing double-gear electric drive axle generally has the problems of complex structure, large shift impact and high manufacturing cost.

[0037] In order to solve the problems existing in the prior art, the utility model embodiment provides a coaxial multi-gear electric drive axle system, which is coaxially arranged by arranging the gear transmission mechanism and the planetary gear assembly, and two shift mechanisms are arranged to realize the switching of three gears and meet the driving needs under different working conditions.

[0038] REFERENCE Figure 1In a preferred embodiment, the coaxial multi-gear electric drive axle system comprises the motor 11, a main box and a sub-box, the main box is provided with a parallel shaft transmission mechanism and a first gear shifting mechanism, the sub-box is provided with a planetary gear set, a second gear shifting mechanism and a differential assembly 51, and it is to be noted that the aforementioned gear transmission mechanism is the parallel shaft transmission mechanism arranged in the main box.

[0039] Specifically, the main box and the sub-box are respectively used to undertake different transmission functions, the main box serves as a first-stage transmission part and mainly comprises a power transmission device arranged at the input end of the motor 11, and the parallel shaft transmission mechanism is responsible for realizing primary power transmission and speed adjustment of the motor 11; the sub-box serves as a second-stage transmission part and realizes further power transmission and speed ratio adjustment through the planetary gear set, and finally outputs power through the differential assembly 51. The split-box design of the embodiment not only facilitates overall layout and assembly, but also is beneficial to heat dissipation and lubrication of the transmission components, and is also convenient for later maintenance.

[0040] Further, the motor 11, the planetary gear set and the differential assembly 51 are configured as a coaxial structure, and such an arrangement mode makes the power transmission path more direct, and at the same time makes the structure of the entire transmission system more compact, thereby greatly reducing the size of the electric drive axle system, so as to facilitate vehicle layout and installation.

[0041] In a preferred embodiment, the parallel shaft transmission mechanism is configured as a two-shaft parallel shaft, comprising an input shaft 12, an intermediate shaft 14 and a sun gear shaft 31, and in the spatial arrangement, the input shaft 12 is arranged in parallel with the intermediate shaft 14, and the input shaft 12 is arranged in coaxial with the sun gear shaft 31.

[0042] Preferably, the input end of the input shaft 12 is fixedly connected to the motor 11, and the two are in transmission connection, the output end of the input shaft 12 is in transmission connection with the intermediate shaft 14, and the output end of the input shaft 12 is further provided with a first engaging tooth 13 adjacent to the first gear shifting mechanism.

[0043] Preferably, the intermediate shaft 14 is fixedly connected with a constant mesh gear 15 and a first driving gear 16, the constant mesh gear 15 is in engagement with the input shaft 12 to realize transmission connection between the input shaft 12 and the intermediate shaft 14, the first driving gear 16 is in engagement with a first driven gear 17, and the two are in transmission connection, the first driven gear 17 is sleeved on the sun gear shaft 31, a second engaging tooth 18 and a third engaging tooth 19 are fixedly connected on the first driven gear 17, wherein the second engaging tooth 18 is arranged adjacent to the first gear shifting mechanism, and the third engaging tooth 19 is arranged adjacent to the second gear shifting mechanism, when the first gear shifting mechanism engages with the second engaging tooth 18, power can be transmitted from the first driven gear 17 to the sun gear shaft 31, when the first gear shifting mechanism engages with the first engaging tooth 13, the first driven gear 17 can freely rotate on the sun gear shaft 31, at this time, the intermediate shaft 14 does not transmit power.

[0044] In the power transmission process, the high-speed rotation output by the motor 11 needs to be reduced in speed and increased in torque through multi-stage gear transmission. First, the first-stage reduction is realized through the constant-mesh gear 15 on the input shaft 12 and the intermediate shaft 14, and then the second-stage reduction is realized through the meshing of the first driving gear 16 and the first driven gear 17 on the intermediate shaft 14. The multi-stage reduction design can gradually reduce the high speed of the motor 11 to a speed range suitable for vehicle driving, while correspondingly increasing the output torque.

[0045] Further, by reasonably designing the tooth number ratio of the first driving gear 16 and the first driven gear 17, the reduction ratio can be accurately controlled, so that the final output speed and torque can meet the requirements of the vehicle power performance. The combination gear is arranged at the output end of the first driven gear 17, which combines the reduction function and the gear shifting function together to improve the integration of the entire transmission system. It should be noted that in the present embodiment, the reduction ratio between the constant-mesh gear 15 on the input shaft 12 and the intermediate shaft 14, and the reduction ratio between the first driving gear 16 and the first driven gear 17 are no longer specifically limited, and those skilled in the art can make adaptive adjustments according to actual needs.

[0046] Preferably, the input end of the sun shaft 31 is provided with a first gear shifting mechanism, which includes a first gear shifting actuator 21, a first gear shifting fork 22, a first tooth hub 24 and a first tooth sleeve 23. The first tooth hub 24 is fixedly connected to the sun shaft 31, and the first tooth sleeve 23 is axially slidable along the first tooth hub 24. When gear shifting is needed, the first gear shifting actuator 21 drives the first gear shifting fork 22, which in turn drives the first tooth sleeve 23 to move axially, so that it can selectively engage with the first combination gear 13 or the second combination gear 18. When the first tooth sleeve 23 engages with the first combination gear 13, power is directly transmitted from the input shaft 12 to the sun shaft 31; when the first tooth sleeve 23 engages with the second combination gear 18, power is transmitted to the sun shaft 31 through the transmission path of the intermediate shaft 14, the first driving gear 16 and the first driven gear 17. Through the precise control of the first gear shifting actuator 21, flexible switching between different gears can be realized to meet the power transmission needs under different working conditions.

[0047] Preferably, the other end of the sun shaft 31 is in transmission connection with a planetary gear set assembly, which includes a sun gear 32, planetary gears, a planet carrier 35 and a ring gear 36.

[0048] The sun gear 32 is in transmission fixed connection with the sun gear shaft 31, to ensure synchronous rotation of the two and reliable transmission of power; the planetary gears include double-connected first planetary gears 33 and second planetary gears 34, which are fixedly connected with each other and are sleeved on the planetary carrier 35, the ring gear 36 is fixedly connected on the housing, the input end of the planetary carrier 35 is provided with a second shift mechanism for realizing switching of the power transmission path under different working conditions, and the output end of the planetary carrier 35 is fixedly connected with the differential assembly 51, to ensure that the final power can be transmitted to the wheels through the left and right half shafts.

[0049] Preferably, the second shift mechanism includes a second shift actuator 41, a second shift fork 42, a second tooth hub 44 and a second tooth sleeve 43, the second tooth hub 44 is fixedly connected on the planetary carrier 35, and the second tooth sleeve 43 can axially slide along the second tooth hub 44; when it is necessary to shift, the second shift actuator 41 drives the second shift fork 42, which in turn drives the second tooth sleeve 43 to move axially, so that the second tooth sleeve 43 can selectively engage or disengage with the third combination tooth 19. Through the cooperation of the first shift mechanism and the second shift mechanism, the transmission of three forward gears is realized.

[0050] Specifically, when the second tooth sleeve 43 engages with the third combination tooth 19, power is transmitted from the sun gear shaft 31 to the sun gear 32, and the sun gear 32 drives the first planetary gears 33 and the second planetary gears 34 to rotate; since the second tooth sleeve 43 engages with the third combination tooth 19, the planetary gear set forms an integral whole, at this time the sun gear 32, the planetary gears and the planetary carrier 35 rotate synchronously as an integral whole, at this time the planetary gear set operates at a transmission ratio of 1:1, and the power is finally output from the planetary carrier 35 to the differential assembly 51 after passing through the planetary gear set.

[0051] When the second tooth sleeve 43 disengages from the third combination tooth 19, power is transmitted from the sun gear shaft 31 to the sun gear 32, and then transmitted to the first planetary gears 33 and the second planetary gears 34 through the sun gear 32; since there is no locking effect at this time, the components of the planetary gear set can work according to the motion law of planetary gears, and the power is output from the planetary carrier 35 to the differential assembly 51 after passing through the planetary gear set to realize a certain reduction ratio.

[0052] Reference Figure 2 In a preferred embodiment, when in a first-gear transmission state, the first tooth sleeve 23 engages with the second combination tooth 18, that is, the first shift mechanism selects a transmission path with a larger reduction ratio, and the power is transmitted to the first driven gear 17 through the input shaft 12, the intermediate shaft 14 and the first driving gear 16, and experiences two-stage reduction; the second tooth sleeve 43 disengages from the third combination tooth 19, which allows the planetary gear set to work normally according to the law of planetary gears, so that the maximum reduction ratio is obtained through three-stage reduction (the first two stages of reduction in the main box and the planetary gear set reduction in the auxiliary box) to meet the demand of large torque in the first gear.

[0053] Referring to Figure 2 In detail, when the system is in the first gear transmission state, the power of the system is input by the motor 11, transmitted to the constant mesh gear 15 through the input shaft 12, then transmitted to the first driven gear 17 through the intermediate shaft 14, and then transmitted to the sun shaft 31 through the first tooth sleeve 23 and the first tooth hub 24 in the first gear shift mechanism. The power is then transmitted to the first planetary gear 33 and the second planetary gear 34 through the sun gear in the sun shaft 31, and then transmitted to the differential assembly 51 through the carrier 35. The power output by the differential assembly 51 is transmitted to the left wheel end 61 and the right wheel end 62 through the left half shaft and the right half shaft respectively.

[0054] Referring to Figure 3 In a preferred embodiment, when the system is in the second gear transmission state, the first tooth sleeve 23 and the second tooth sleeve 43 remain in the combined state, that is, the first gear shift mechanism still maintains the transmission path with a large reduction ratio. The second tooth sleeve 43 is engaged with the third combined gear 19, so that the planetary gear set forms an integral 1:1 transmission. Thus, through the front-stage transmission and the 1:1 transmission of the planetary gear set, a medium reduction ratio is obtained.

[0055] Referring to Figure 3 In detail, when the system is in the second gear transmission state, the power of the system is input by the motor 11, transmitted to the constant mesh gear 15 through the input shaft 12, then transmitted to the first driven gear 17 through the intermediate shaft 14, and then transmitted to the sun shaft 31 through the first tooth sleeve 23 and the first tooth hub 24 in the first gear shift mechanism. Since the second tooth sleeve 43 is engaged with the third combined gear 19, the planetary gear set forms an integral whole, and the power is directly transmitted to the differential assembly 51 through the carrier 35. The power is finally transmitted to the left wheel end 61 and the right wheel end 62 through the left half shaft and the right half shaft respectively.

[0056] Referring to Figure 4 In a preferred embodiment, when the system is in the third gear transmission state, the first tooth sleeve 23 is engaged with the first combined gear 13, that is, the first gear shift mechanism is switched to a direct transmission path to reduce the reduction ratio. The second tooth sleeve 43 is again separated from the third combined gear 19, and the planetary gear set restores the reduction effect of the planetary gear. At this time, through direct transmission and planetary gear reduction, a smaller reduction ratio can be obtained.

[0057] Referring to Figure 4The red part is the power flow direction, specifically, in the three-gear transmission state, the power is input from the motor 11, transmitted to the sun gear shaft 31 through the first combined gear 13, the first gear sleeve 23 and the first gear hub 24, then transmitted to the first planetary gear 33 and the second planetary gear 34 through the sun gear 32, and transmitted to the differential assembly 51 through the carrier 35, and finally split through the left half shaft and the right half shaft, so that the three-gear power flow is transmitted to the left wheel end 61 and the right wheel end 62 respectively.

[0058] In the above embodiment, by reasonably designing the working state of the planetary gear set and the transmission path of the main box, three different transmission ratios are realized. The first gear utilizes three-stage reduction to obtain the maximum reduction ratio, the second gear obtains the medium reduction ratio by the main box reduction plus the 1:1 transmission of the planetary gear set, and the third gear obtains a smaller reduction ratio by direct transmission plus planetary gear set reduction. Compared with the prior art, the transmission structure provided in the embodiment greatly reduces the number of transmission parts, and the transmission path of each gear is reasonably arranged, which can effectively reduce power loss and ensure high transmission efficiency.

[0059] In an embodiment of the utility model, a vehicle is also provided, which is configured with the coaxial multi-gear electric drive axle system described above. Preferably, the vehicle in the embodiment is a pure electric commercial vehicle, such as an electric truck, an electric bus, an electric transport vehicle, an electric tractor, etc. Based on the electric drive axle system described above, the vehicle can meet the driving requirements of different working conditions.

[0060] Although example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above-described example embodiments are merely exemplary and are not intended to limit the scope of the present application. Those of ordinary skill in the art can make various changes and modifications without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as claimed in the appended claims.

[0061] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present specification.

[0062] Similarly, it is to be understood that the embodiments of the application can alternately be phrased or described substantially similarly to what is claimed by one skilled in the art in related art terminology or art-specific terminology. Thus, no disavowal of claim scope is intended or suggested. Similarly, it is to be understood that, for brevity and clarity, terms of length and / or complexity are not provided where it is deemed unnecessary or wasteful of the reader's time, for the purpose of elucidating the principles of the application. It is intended that each functional step, process, means or unit disclosed in the description or claims be implied to encompass one or more known or future-developed steps, processes, means or units for performing the function disclosed. Thus, the description and drawings should be understood to have been made by way of example only and the actual scope of the application is to be determined by reference to the appended claims.

[0063] Those skilled in the art will appreciate that all features described in this specification (including the summary and abstract), and / or depicted in the drawings, can be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Each feature disclosed in this specification, including any accompanying claims, abstract and drawings, can be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Claims

1. A coaxial multi-gear electric drive axle system, characterized in that, The coaxial multi-gear electric drive axle system comprises a motor, a parallel shaft transmission mechanism, a first gear shifting mechanism, a planetary gear set and a second gear shifting mechanism. The parallel shaft transmission mechanism comprises an input shaft, an intermediate shaft and a sun shaft. The input shaft is in transmission connection with the motor and the intermediate shaft respectively, and the output end of the input shaft is provided with a first engaging gear capable of being in transmission connection with the first gear shifting mechanism. The output end of the intermediate shaft is in transmission connection with a first driven gear, and the output end of the first driven gear is provided with a second engaging gear and a third engaging gear, the second engaging gear being capable of being in transmission connection with the first gear shifting mechanism, and the third engaging gear being capable of being in transmission connection with the second gear shifting mechanism. The input end of the sun shaft is provided with the first gear shifting mechanism, and the sun shaft is in transmission connection with the planetary gear set. The planetary gear set comprises a planetary carrier, and the input end of the planetary carrier is provided with the second gear shifting mechanism. Through cooperation of the first gear shifting mechanism and the second gear shifting mechanism, transmission of three forward gears is realized.

2. The in-line multi-speed electrically driven axle system of claim 1, wherein, A constant engaging gear and a first driving gear are fixedly arranged on the intermediate shaft, the constant engaging gear is in engagement with the input shaft to realize transmission connection between the input shaft and the intermediate shaft, and the first driving gear is in engagement with the first driven gear.

3. The in-line multi-speed electrically driven axle system of claim 2, wherein, The first driven gear is sleeved on the sun shaft, and the second engaging gear and the third engaging gear are fixedly arranged on the first driven gear, the second engaging gear being arranged adjacent to the first gear shifting mechanism, and the third engaging gear being arranged adjacent to the second gear shifting mechanism.

4. The in-line multi-speed electrically driven axle system of claim 3, wherein, The first gear shifting mechanism comprises a first gear shifting actuator, a first gear shifting fork, a first gear hub and a first gear sleeve, the first gear hub being fixedly arranged on the sun shaft, the first gear sleeve being axially slidable along the first gear hub, and the first gear sleeve being capable of being selectively engaged with the first engaging gear or the second engaging gear.

5. The in-line multi-speed electrically driven axle system of claim 4, wherein, The second gear shifting mechanism comprises a second gear shifting actuator, a second gear shifting fork, a second gear hub and a second gear sleeve, the second gear hub being fixedly arranged on the planetary carrier, the second gear sleeve being axially slidable along the second gear hub, and the second gear sleeve being capable of being selectively engaged with the third engaging gear.

6. The in-line multi-speed electrically driven axle system of claim 5, wherein, The planetary gear set further comprises a ring gear, a sun gear and a planet gear, the sun gear being in transmission and fixed connection with the sun shaft, the planet gear being arranged on the planetary carrier, and the planetary carrier being fixedly connected with a differential assembly.

7. The in-line multi-speed electrically driven axle system of claim 6, wherein, When in a one-gear transmission state, the first gear sleeve is engaged with the second engaging gear, and the second gear sleeve is separated from the third engaging gear.

8. The in-line multi-speed electrically driven axle system of claim 6, wherein, When in a two-gear transmission state, the first gear sleeve remains engaged with the second engaging gear, and the second gear sleeve is engaged with the third engaging gear.

9. The in-line multi-speed electrically driven axle system of claim 6, wherein, When in a three-gear transmission state, the first gear sleeve is engaged with the first engaging gear, and the second gear sleeve is separated from the third engaging gear.

10. A vehicle characterized by comprising: The vehicle comprises the coaxial multi-gear electric drive axle system according to any one of claims 1-9.

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