Multi-gear electric drive axle structure

Abstract

The application provides a multi-gear electric drive axle structure, which does not interrupt gear shifting power, improves driving experience, avoids the risk of hill coasting, is compact in axial length, is simple in vehicle arrangement, is uniform in mass distribution of the electric drive axle power assembly relative to the position of the half shaft, has a short cantilever in the front-rear direction of the vehicle, greatly improves stress and vibration conditions, is simple in structure, rich in gear expansion modes, suitable for various complex working conditions, and low in overall energy consumption of the electric drive axle. The application relates to a multi-gear electric drive axle structure, which is characterized in that the structure comprises an A-side transmission assembly, a B-side transmission assembly, a differential assembly and an idler.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle drive axle structure, and particularly to a multi-gear electric drive axle structure. BACKGROUND

[0002] The existing multi-gear electric drive axle structure of the vehicle has the problems of gear shifting power interruption, poor driving experience, and risk of hill coasting. The multi-gear electric drive axle with non-interrupted gear shifting power has a too long axial length, which makes the vehicle arrangement difficult. The mass center of the electric drive axle power assembly is cantilevered in the front-rear direction of the vehicle relative to the position of the half shaft, which makes the stress and vibration conditions worse. The structure is complex, the gear expansion mode is insufficient, and the overall energy consumption of the electric drive axle is high. SUMMARY

[0003] To solve the above problems, the present application provides a multi-gear electric drive axle structure, which has non-interrupted gear shifting power, improves the driving experience, avoids the risk of hill coasting, has a compact axial length, and is simple to arrange on the vehicle. The mass distribution of the electric drive axle power assembly is uniform relative to the position of the half shaft, the mass center is cantilevered short in the front-rear direction of the vehicle, which greatly improves the stress and vibration conditions. The structure is simple, the gear expansion mode is rich, it is suitable for various complex working conditions, and the overall energy consumption of the electric drive axle is low.

[0004] A multi-gear electric drive axle structure, characterized in that it comprises:

[0005] An A-side transmission assembly comprising an A-side power input assembly, an A-side intermediate shaft assembly, and an A-side output shaft assembly;

[0006] A B-side transmission assembly comprising a B-side power input assembly, a B-side intermediate shaft assembly, and a B-side output shaft assembly;

[0007] A differential assembly comprising a differential, a differential passive gear, a half shaft A, and a half shaft B, wherein the differential passive gear, the half shaft A, and the half shaft B are fixedly connected to the differential;

[0008] and an idler;

[0009] The A-side transmission assembly and the B-side transmission assembly are arranged on both sides of the half shaft A, and the components corresponding to the A-side transmission assembly and the B-side transmission assembly are located in the axial length region formed by the combination of the differential and the half shaft A;

[0010] The output end of the A-side transmission assembly is connected to the differential passive gear through A-side differential driving teeth, the output end of the B-side transmission assembly is connected to the differential passive gear through B-side differential driving teeth, the A-side transmission assembly comprises A-side intermediate shaft constant meshing teeth, the B-side transmission shaft assembly comprises coupling gear driving teeth, and the idler meshes with the A-side intermediate shaft constant meshing teeth and the coupling gear driving teeth arranged on both sides thereof.

[0011] Further characterized in that:

[0012] The A-side power input assembly comprises an A-side drive motor, an A-side input shaft, an A-side input gear, the output end of the A-side drive motor being connected to the A-side input gear through the A-side input shaft;

[0013] The A-side intermediate shaft assembly comprises a one-gear driving gear, a three-gear driving gear, an A-side intermediate shaft constant meshing gear, and an A-side intermediate shaft; the one-gear driving gear, the three-gear driving gear, and the A-side intermediate shaft constant meshing gear are fixedly connected to the A-side intermediate shaft in the axial direction;

[0014] The A-side output shaft assembly comprises a one-gear driven gear, a three-gear shifter, a three-gear driven gear, an A-side differential driving gear, and an A-side output shaft; the one-gear driven gear, the three-gear shifter, the three-gear driven gear, and the A-side differential driving gear are sequentially arranged on the A-side output shaft in the axial direction; the one-gear driven gear and the three-gear driven gear are loosely fitted on the A-side output shaft; the three-gear shifter is fixedly connected to the A-side output shaft and is arranged between the one-gear driven gear and the three-gear driven gear; and the A-side differential driving gear is fixedly connected to the A-side output shaft;

[0015] The A-side intermediate shaft is arranged in parallel with the A-side input shaft and the A-side output shaft is arranged in parallel with the A-side intermediate shaft;

[0016] The A-side input gear is meshingly connected to the A-side intermediate shaft constant meshing gear; the one-gear driving gear is meshingly connected to the one-gear driven gear; and the three-gear driving gear is meshingly connected to the three-gear driven gear;

[0017] The three-gear shifter can realize the connection between the A-side output shaft and the one-gear driven gear and the three-gear driven gear by shifting gears to the left and to the right;

[0018] The A-side differential driving gear is meshingly connected to the differential driven gear.

[0019] The B-side power input assembly comprises a B-side drive motor, a B-side input shaft, and a B-side input gear; the output end of the B-side drive motor is connected to the B-side input gear through the B-side input shaft;

[0020] The B-side intermediate shaft assembly comprises a B-side intermediate shaft constant meshing gear, a two-gear driving gear, a two-coupling-gear shifter, a coupling-gear driving gear, and a B-side intermediate shaft; the B-side intermediate shaft constant meshing gear, the two-gear driving gear, the two-coupling-gear shifter, and the coupling-gear driving gear are sequentially arranged on the B-side intermediate shaft in the axial direction; the B-side intermediate shaft constant meshing gear is fixedly connected to the B-side intermediate shaft; the two-gear driving gear and the coupling-gear driving gear are loosely fitted on the B-side intermediate shaft; and the two-coupling-gear shifter is fixedly connected to the B-side intermediate shaft and is arranged between the two-gear driving gear and the coupling-gear driving gear;

[0021] B side output shaft assembly, comprising two gear passive tooth, B side differential main tooth, B side output shaft; The two gear passive tooth, B side differential main tooth is sequentially fixed on B side output shaft along the axial direction;

[0022] The B side intermediate shaft is arranged in parallel with the B side input shaft and the B side output shaft;

[0023] The B side input tooth is connected with the B side intermediate shaft by engagement; The two gear main tooth is connected with the two gear passive tooth by engagement;

[0024] The two coupling gear shifters can realize the connection between the B side intermediate shaft and the two gear main tooth and the coupling gear main tooth by shifting gears to the left and right;

[0025] The B side differential main tooth is connected with the differential passive tooth by engagement.

[0026] The center shaft of the idler gear is arranged in parallel with the A side intermediate shaft and the B side intermediate shaft; The idler gear is arranged axially between the differential passive tooth and the three gear passive tooth.

[0027] It has the further features that:

[0028] The center shaft of the idler gear is coaxially arranged with the half shaft A;

[0029] The center shaft of the idler gear is arranged in parallel with the half shaft A but not coaxially;

[0030] The idler gear is supported on the differential housing by bearings or supported on the electric drive axle housing by bearings;

[0031] The three gear shifter and the two coupling gear shifter are specifically synchronizer or sliding sleeve structure.

[0032] After the application is adopted, the structure is simple, the axial length is compact, the whole vehicle arrangement is simple, the electric drive axle power assembly mass is uniformly distributed relative to the half shaft position, the center of mass is short in the front and rear direction of the whole vehicle, and the stress and vibration conditions are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the application;

[0034] The names corresponding to the serial numbers in the figure are as follows:

[0035] A side drive motor 1, one gear main driven gear 2, three gear main driven gear 3, A side input gear 4, A side input shaft 5, A side intermediate shaft constant mesh gear 6, A side intermediate shaft 7, idler 8, A side differential main driven gear 9, A side output shaft 10, differential driven gear 11, differential 12, half shaft B 13, B side output shaft 14, B side differential main driven gear 15, B side intermediate shaft 16, coupling gear main driven gear 17, two coupling gear shifters 18, two gear main driven gear 19, B side input gear 20, B side input shaft 21, B side drive motor 22, B side intermediate shaft constant mesh gear 23, two gear driven gear 24, half shaft A 25, three gear driven gear 26, one three gear shifter 27, one gear driven gear 28. DETAILED DESCRIPTION

[0036] A multi-gear electric drive axle structure, see Figure 1 : which includes an A side transmission assembly, a B side transmission assembly, a differential assembly, and an idler;

[0037] The A side transmission assembly includes an A side power input assembly, an A side intermediate shaft assembly, an A side output shaft assembly;

[0038] The B side transmission assembly includes a B side power input assembly, a B side intermediate shaft assembly, a B side output shaft assembly;

[0039] The differential assembly includes a differential 12, a differential driven gear 11, a half shaft A 25, and a half shaft B 13; the differential driven gear 11, the half shaft A 25, and the half shaft B 13 are respectively fixedly connected with the differential 12;

[0040] The A side transmission assembly and the B side transmission assembly are respectively arranged at two side position regions of the half shaft A 25, and the corresponding components of the A side transmission assembly and the B side transmission assembly are located in an axial length region formed by the differential 12 and the half shaft A 25;

[0041] An output end of the A side transmission assembly is connected with the differential driven gear 11 through the A side differential main driven gear 9, an output end of the B side transmission assembly is connected with the differential driven gear 11 through the B side differential main driven gear 15, the A side transmission assembly includes the A side intermediate shaft constant mesh gear 6, and the B side transmission shaft assembly includes the coupling gear main driven gear 17; the idler 8 is respectively meshed with the A side intermediate shaft constant mesh gear 6 and the coupling gear main driven gear 17 arranged at two sides thereof.

[0042] In specific implementation, see Figure 1 :

[0043] The A side power input assembly includes an A side drive motor 1, an A side input shaft 5, and an A side input gear 4; the A side drive motor 1 and the A side input gear 4 are respectively fixedly connected with the A side input shaft 5;

[0044] A side intermediate shaft assembly, comprising a first gear driving tooth 2, a third gear driving tooth 3, an A side intermediate shaft always meshing tooth 6, an A side intermediate shaft 7; the first gear driving tooth 2, the third gear driving tooth 3 and the A side intermediate shaft always meshing tooth 6 are sequentially fixed on the A side intermediate shaft 7 from left to right; the A side intermediate shaft 7 is arranged in parallel with the A side input shaft 5;

[0045] A side output shaft assembly, comprising a first gear driven tooth 28, a third gear shifter 27, a third gear driven tooth 26, an A side differential driving tooth 9, an A side output shaft 10; the first gear driven tooth 28, the third gear shifter 27 and the third gear driven tooth 26 are sequentially arranged on the A side output shaft 10 from left to right; the first gear driven tooth 28 and the third gear driven tooth 26 are sleeved on the A side output shaft 10; the third gear shifter 27 is fixed on the A side output shaft 10 and arranged between the first gear driven tooth 28 and the third gear driven tooth 26; the A side differential driving tooth 9 is fixed on the A side output shaft 10; the A side output shaft 10 is arranged in parallel with the A side intermediate shaft 7;

[0046] The A side input tooth 4 is meshingly connected with the A side intermediate shaft always meshing tooth 6; the first gear driving tooth 2 is meshingly connected with the first gear driven tooth 28; the third gear driving tooth 3 is meshingly connected with the third gear driven tooth 26; the third gear shifter 27 can be connected with the first gear driven tooth 28 and the third gear driven tooth 26 by hanging gears to the left and right; the A side differential driving tooth 9 is meshingly connected with the differential driven tooth 11;

[0047] B side power input assembly, comprising a B side driving motor 22, a B side input shaft 21, a B side input tooth 20, the B side driving motor 22 and the B side input tooth 20 are fixed together with the B side input shaft 21;

[0048] B side intermediate shaft assembly, comprising a B side intermediate shaft always meshing tooth 23, a second gear driving tooth 19, a coupling gear shifter 18, a coupling gear driving tooth 17, a B side intermediate shaft 16; the B side intermediate shaft always meshing tooth 23, the second gear driving tooth 19, the coupling gear shifter 18 and the coupling gear driving tooth 17 are sequentially arranged on the B side intermediate shaft 16 from left to right; the B side intermediate shaft always meshing tooth 23 is fixed on the B side intermediate shaft 16; the second gear driving tooth 19 and the coupling gear driving tooth 17 are sleeved on the B side intermediate shaft 16; the coupling gear shifter 18 is fixed on the B side intermediate shaft 16 and arranged between the second gear driving tooth 19 and the coupling gear driving tooth 17; the B side intermediate shaft 16 is arranged in parallel with the B side input shaft 21;

[0049] B side output shaft assembly, comprising a second gear driven tooth 24, a B side differential driving tooth 15, a B side output shaft 14; the second gear driven tooth 24 and the B side differential driving tooth 15 are sequentially fixed on the B side output shaft 14 from left to right; the B side output shaft 14 is arranged in parallel with the B side intermediate shaft 16;

[0050] The B-side input tooth 20 is in meshing connection with the B-side intermediate shaft constant meshing tooth 23; the two-gear main driving tooth 19 is in meshing connection with the two-gear passive tooth 24; the two-coupling gear shifter 18 can be connected with the two-gear main driving tooth 19 and the coupling gear main driving tooth 17 by hanging gears to the left and right; the B-side differential main driving tooth 15 is in meshing connection with the differential passive tooth 11;

[0051] The idler gear 8 is arranged in parallel with the A-side intermediate shaft 7 and the B-side intermediate shaft 16; the idler gear 8 is arranged between the differential passive tooth 11 and the three-gear passive tooth 26; the idler gear 8 is in meshing connection with the A-side intermediate shaft constant meshing tooth 6 and the coupling gear main driving tooth 17;

[0052] The A-side power input assembly, the A-side intermediate shaft assembly and the A-side output shaft assembly are arranged on one side relative to the half shaft position; the B-side power input assembly, the B-side intermediate shaft assembly and the B-side output shaft assembly are arranged on the other side; the structure is simple, the axial length is compact, the whole vehicle arrangement is simple; relative to the position of one of the half shafts, the electric drive axle power assembly is uniformly distributed in mass, the center of mass is short in the front and rear directions of the whole vehicle, and the stress and vibration conditions are greatly improved.

[0053] The working principle is as follows:

[0054] The multi-gear electric drive axle structure is composed of two parallel arranged motors, a plurality of gear assemblies and a differential assembly; the two motors and different gear transmission assemblies are used in combination, so that the multi-gear position with different speed ratios and uninterrupted shifting power can be realized.

[0055] When the gear is one, the two-coupling gear shifter 18 is maintained in the neutral position and does not move, and the three-gear shifter 27 is hung to the left to connect the A-side output shaft 10 with the one-gear passive tooth 28; at this time, the A-side driving motor 1 serves as a power source to drive the A-side input shaft 5 to rotate, and then the rotating power is transmitted to the A-side input tooth 4 fixedly connected with the A-side input shaft 5, the A-side input tooth 4 further transmits the power to the A-side intermediate shaft constant meshing tooth 6 through meshing connection, and then the power is transmitted to the A-side intermediate shaft 7 fixedly connected with three teeth arranged in parallel with the A-side input shaft 5, the A-side intermediate shaft 7 drives the one-gear main driving tooth 2 fixedly connected thereto to rotate, the one-gear main driving tooth 2 drives the one-gear passive tooth 28 to rotate through meshing connection, and further transmits the power to the A-side output shaft 10 through the three-gear shifter 27, the A-side output shaft 10 drives the A-side differential main driving tooth 9 fixedly connected thereto to rotate, and then drives the differential passive tooth 11 in meshing connection with the A-side differential main driving tooth 9 to rotate, and finally transmits the force to the outside through the half shaft A 25 and the half shaft B 13 fixedly connected with the differential 12, to complete the transmission of the one-gear power flow; in this process, the initial torque of the A-side driving motor 1 is transmitted to the outside after being amplified by the three-stage tooth ratio designed for the one-gear, to realize speed reduction and torque increase.

[0056] When the second gear is engaged, the second coupling gear 18 is maintained in the idle position, and the first coupling gear 27 is engaged to connect the B-side output shaft 14 and the third driven gear 26. At this time, the B-side driving motor 22 drives the B-side input shaft 21 to rotate, and the rotating power is transmitted to the B-side input gear 20 connected with the B-side input shaft 21. The B-side input gear 20 further transmits the power to the B-side intermediate shaft constant mesh gear 23 through meshing connection. The power is then transmitted to the B-side intermediate shaft 16 arranged in parallel with the B-side input shaft 21. The B-side intermediate shaft 16 drives the second coupling gear 18 to rotate, and the second coupling gear 18 drives the second driving gear 19 to rotate. The second driving gear 19 drives the second driven gear 24 to rotate through meshing connection, and then drives the B-side output shaft 14 to rotate. The B-side output shaft 14 drives the B-side differential driving gear 15 to rotate, and then drives the differential driven gear 11 connected with the B-side differential driving gear 15 to rotate. Finally, the force is transmitted to the outside through the half shaft A 25 and the half shaft B 13 connected with the differential 12, and the power flow of the second gear is completed. In this process, the initial torque of the B-side driving motor 22 is amplified through the three-stage tooth ratio designed for the second gear and then transmitted to the outside, achieving speed reduction and torque increase.

[0057] When the third gear is engaged, the second coupling gear 18 is maintained in the idle position, and the first coupling gear 27 is engaged to connect the A-side output shaft 10 and the third driven gear 26. At this time, the A-side driving motor 1 drives the A-side input shaft 5 to rotate, and the rotating power is transmitted to the A-side input gear 4 connected with the A-side input shaft 5. The A-side input gear 4 further transmits the power to the A-side intermediate shaft constant mesh gear 6 through meshing connection. The power is then transmitted to the A-side intermediate shaft 7 arranged in parallel with the A-side input shaft 5 and connected with three gears. The A-side intermediate shaft 7 drives the third driving gear 3 to rotate, and the third driving gear 3 drives the third driven gear 26 to rotate through meshing connection. The power is then transmitted to the A-side output shaft 10 through the first coupling gear 27. The A-side output shaft 10 drives the A-side differential driving gear 9 to rotate, and then drives the differential driven gear 11 connected with the A-side differential driving gear 9 to rotate. Finally, the force is transmitted to the outside through the half shaft A 25 and the half shaft B 13 connected with the differential 12, and the power flow of the third gear is completed. In this process, the initial torque of the A-side driving motor 1 is amplified through the three-stage tooth ratio designed for the third gear and then transmitted to the outside, achieving speed reduction and torque increase.

[0058] When the vehicle continuously shifts gears, the two driving motors cooperate with the gear shifters to realize uninterrupted power flow during gear shifting. For example, when the first gear is switched to the second gear, the second gear is switched to the third gear, or the third gear is switched to the second gear, the power is uninterrupted. The principle of uninterrupted power during gear shifting is the same. Taking the first gear to the second gear as an example:

[0059] When the electric drive bridge is in the first gear, the first-third gear shifter 27 is shifted to the left, connecting the A-side output shaft 10 with the first gear passive gear 28. At this time, the rotating power of the A-side drive motor 1 is transmitted to the first gear passive gear 28 through the A-side input shaft 5, the A-side input gear 4, the A-side intermediate shaft constant mesh gear 6, the first gear driving gear 2 on the A-side intermediate shaft 7, and then transmitted to the outside through the half shaft A 25 and the half shaft B 13 via the differential 12.

[0060] When the second gear needs to be switched, the first power transmission state remains unchanged, while the second coupling gear shifter 18 is shifted to the left, connecting the B-side intermediate shaft with the second gear driving gear 19. At this time, the rotating power of the B-side drive motor 22 is transmitted to the second gear driving gear 19 through the B-side input shaft 21, the B-side input gear 20, the B-side intermediate shaft constant mesh gear 23, and then transmitted to the second gear passive gear 24, the B-side output shaft 14, the B-side differential driving gear 15, and the differential passive gear 11. Finally, the power is transmitted to the outside through the differential 12 via the half shaft A 25 and the half shaft B 13.

[0061] At this time, the first gear power driven by the A-side drive motor 1 and the second gear power driven by the B-side drive motor 22 are output simultaneously. At this time, the first-third gear shifter 27 returns to the neutral position, disconnecting the first gear power. The output power of the second gear remains unchanged, i.e., the output power of the half shaft does not interrupt. This process completes the switching from the first gear to the second gear without interrupting the power.

[0062] In addition, when the vehicle needs to output high power in the first gear or the third gear, the power of the B-side drive motor 22 can be combined with the power of the A-side drive motor 1 through the coupling gear, and output at the speed ratio of the first gear or the third gear. The principle of the first gear coupling and the third gear coupling is similar. Taking the first gear coupling as an example, the principle is described as follows:

[0063] When the first gear is coupled, the A-side drive motor 1 transmits power in the first gear, while the second coupling gear shifter 18 connects the B-side intermediate shaft with the coupling gear driving gear 17 to the right.

[0064] At this time, the rotating power of the B-side drive motor 22 is transmitted to the coupling gear driving gear 17 through the B-side input shaft 21, the B-side input gear 20, the B-side intermediate shaft constant mesh gear 23, and then transmitted to the idler gear 8 through the second coupling gear shifter 18 on the B-side intermediate shaft 16. The idler gear 8 transmits the power to the A-side intermediate shaft constant mesh gear 6 through the meshing connection.

[0065] At this time, the power of the B-side driving motor 22 is coupled with the power of the A-side driving motor 1 on the A-side intermediate shaft constant mesh gear 6; the power gathered together is transmitted to the first gear driven gear 28 by the first gear driving gear 2 on the A-side intermediate shaft constant mesh gear 6 and the A-side intermediate shaft 7, and then transmitted to the outside through the third gear shifter 27, the A-side output shaft 10, the A-side differential driving gear 9, the differential driven gear 11, and finally the differential 12 by the half shaft A 25 and the half shaft B 13, so as to realize the power output of the first gear coupling.

[0066] The structure is simple, power is not interrupted during gear switching, gear expansion mode is rich, various complex working conditions are adapted, and the overall energy consumption of the electric drive axle is low.

[0067] It is apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, and that the application can be implemented in other particular forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the application should be defined by the appended claims rather than the above description, and it is intended to include all changes falling within the meaning and range of equivalents of the claims. Any reference signs in the claims should not be deemed to limit the claims involved.

[0068] Furthermore, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A multi-gear electric drive axle structure, characterized by, It includes: A side transmission assembly, including A side power input assembly, A side intermediate shaft assembly, A side output shaft assembly; B side transmission assembly, including B side power input assembly, B side intermediate shaft assembly, B side output shaft assembly; Differential assembly, including differential, differential driven gear, half shaft A, half shaft B; the differential driven gear, half shaft A, half shaft B are respectively fixed together with differential; And idler; The A side transmission assembly, B side transmission assembly is respectively arranged in the position area of the half shaft A, and the corresponding parts of the A side transmission assembly, B side transmission assembly are located in the axial length area formed by the combination of differential and half shaft A; The output end of the A side transmission assembly is connected with the differential driven gear through the A side differential driving gear, the output end of the B side transmission assembly is connected with the differential driven gear through the B side differential driving gear, the A side transmission assembly has A side intermediate shaft constant meshing gear, the B side transmission assembly has coupling block driving gear, the idler is respectively engaged with the A side intermediate shaft constant meshing gear and the coupling block driving gear arranged on both sides thereof; The A side power input assembly includes A side driving motor, A side input shaft, A side input gear, the output end of A side driving motor is connected with the A side input gear through A side input shaft; A side intermediate shaft assembly includes one block driving gear, three block driving gear, A side intermediate shaft constant meshing gear, A side intermediate shaft; the one block driving gear, three block driving gear, A side intermediate shaft constant meshing gear are fixed on the A side intermediate shaft from the axial direction; A side output shaft assembly includes one block driven gear, three block shifter, three block driven gear, A side differential driving gear, A side output shaft; the one block driven gear, three block shifter, three block driven gear, A side differential driving gear are sequentially sleeved on A side output shaft from the axial direction; the one block driven gear, three block driven gear are sleeved on A side output shaft; the three block shifter is fixed on A side output shaft and arranged between one block driven gear and three block driven gear; the A side differential driving gear is fixed on A side output shaft; The A side intermediate shaft is arranged in parallel with A side input shaft and A side output shaft; The A side input gear is connected with A side intermediate shaft constant meshing gear; the one block driving gear is connected with one block driven gear; the three block driving gear is connected with three block driven gear; The three block shifter can realize the connection of A side output shaft with one block driven gear and three block driven gear by hanging gear to left and right; The A side differential driving gear is connected with differential driven gear; B side power input assembly includes B side driving motor, B side input shaft, B side input gear, the output end of B side driving motor is connected with B side input gear through B side input shaft; The B-side intermediate shaft assembly comprises a B-side intermediate shaft constant gear, a two-gear driving gear, a two-coupling gear shifter, a coupling gear driving gear and a B-side intermediate shaft. The B-side intermediate shaft constant gear, the two-gear driving gear, the two-coupling gear shifter and the coupling gear driving gear are sequentially arranged on the B-side intermediate shaft along the axial direction. The B-side intermediate shaft constant gear is fixedly connected to the B-side intermediate shaft. The two-gear driving gear and the coupling gear driving gear are sleeved on the B-side intermediate shaft. The two-coupling gear shifter is fixedly connected to the B-side intermediate shaft and arranged between the two-gear driving gear and the coupling gear driving gear. The B-side output shaft assembly comprises a two-gear passive gear and a B-side differential driving gear. The two-gear passive gear and the B-side differential driving gear are sequentially fixedly connected to the B-side output shaft along the axial direction. The B-side intermediate shaft is parallel to the B-side input shaft and the B-side output shaft. The B-side input gear is in meshing connection with the B-side intermediate shaft constant gear. The two-gear driving gear is in meshing connection with the two-gear passive gear. The two-coupling gear shifter can realize the connection between the B-side intermediate shaft and the two-gear driving gear and the coupling gear driving gear by shifting gears to the left and right. The B-side differential driving gear is in meshing connection with the differential passive gear. The center shaft of the idler gear is parallel to the A-side intermediate shaft and the B-side intermediate shaft. The idler gear is axially arranged between the differential passive gear and the three-gear passive gear. The idler gear is supported on the differential housing by a bearing or supported on the electric drive axle housing by a bearing.

2. The multi-gear electric drive axle structure according to claim 1, characterized in that: The center shaft of the idler gear is coaxially arranged with the half shaft A.

3. The multi-gear electric drive axle structure according to claim 1, characterized in that: The center shaft of the idler gear is parallel to but not coaxial with the half shaft A.

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