Electric drive axle transmission system and vehicle

Abstract

An electric drive axle transmission system and a vehicle. The transmission system comprises an integrated motor-reducer housing (3), a first shaft (1), and a second shaft (2); a first driving gear (11) is sleeved on the tail end of the first shaft (1); a first plain bore section and a first internal spline section are sequentially provided on the inner wall of an inner bore of the first driving gear (11) in the axial direction of the inner bore; a first plain shaft section (12) and a first external spline section (13) respectively corresponding to the first plain bore section and the first internal spline section are provided at the tail end of the first shaft (1); the first plain bore section is in interference fit with the first plain shaft section (12), and the first external spline section (13) is in clearance fit with the first internal spline section; the second shaft (2) is provided with a first driven gear (21) and a second driving gear (22); and the first driven gear (21) is engaged with the first driving gear (11). The connection between an integrated motor-reducer shaft and the driving gears of the electric drive axle transmission system is stable and reliable, and convenient mounting is achieved.

Description

Electric drive axle transmission system and vehicle Technical Field

[0001] The present invention relates to the field of drive transmission technology, and in particular to an electric drive axle transmission system and a vehicle. Background Art

[0002] The electric drive axle drivetrains in current mainstream vehicles primarily utilize a separate motor assembly and a separate reducer assembly, assembled via bolt connections. This system requires bolted bosses for the motor and reducer housings, resulting in partial overlap after assembly, increasing weight. Furthermore, both the motor shaft and reducer input shaft require two bearings each, which increases costs. Furthermore, these mainstream drivetrains have numerous components, which can lead to significant cumulative assembly errors, resulting in misalignment between the motor and reducer input shafts. This can cause transmission instability, NVH issues, and poor driving experience.

[0003] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Summary of the Invention

[0004] The object of the present invention is to provide an electric drive axle transmission system, which integrates the motor housing and reducer housing of the traditional structure into one, and the connection between the motor and reducer integrated shaft and the driving gear is stable and easy to install.

[0005] Another object of the present invention is to provide a vehicle having the above-mentioned electric drive axle transmission system.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An electric drive axle transmission system includes a motor-reducer integrated housing and a first shaft and a second shaft located inside the motor-reducer integrated housing;

[0008] The motor-reducer integrated housing has a motor cavity and a reducer cavity inside; the first shaft is located in the motor cavity and its end extends into the reducer cavity, and the second shaft is located in the reducer cavity;

[0009] The first shaft end is sleeved with a first driving gear, and the inner wall of the inner hole of the first driving gear is provided with a first optical hole section and a first internal spline section in sequence along the axial direction of the inner hole; the first shaft end is provided with a first optical axis section and a first external spline section corresponding to the first optical hole section and the first internal spline section respectively; the first optical hole section and the first optical axis section have an interference fit, and the first external spline section and the first internal spline section have a clearance fit;

[0010] The second shaft is provided with a first driven gear and a second driving gear, and the first driven gear is meshed with the first driving gear.

[0011] According to one embodiment of the present invention, a threaded section is further provided at the end of the first shaft, and a limiting nut is provided on the threaded section.

[0012] According to one embodiment of the present invention, a flat portion is provided at the end of the threaded segment.

[0013] According to one embodiment of the present invention, the inner wall of the inner hole of the first driven gear is provided with a second light hole segment and a second internal spline segment in sequence along the axial direction of the inner hole; the second shaft end is provided with a second light shaft segment and a second external spline segment corresponding to the second light hole segment and the second internal spline segment respectively; the second light hole segment and the second light shaft segment are interference fit, and the second external spline segment and the second internal spline segment are clearance fit.

[0014] According to one embodiment of the present invention, the electric drive axle transmission system further includes an axle housing, wherein a differential is provided in the axle housing, and the differential is provided with a second driven gear, and the second driven gear is meshed with the second driving gear.

[0015] According to one embodiment of the present invention, a partition is provided between the motor cavity and the reducer cavity, a motor back cover is provided at one end of the motor cavity away from the partition, a reducer back cover is provided at one end of the reducer cavity away from the partition, a connecting port is provided on the side of the reducer cavity, and the second driving gear is located inside the connecting port.

[0016] According to one embodiment of the present invention, a connecting flange is provided on the outer side of the connecting port, and the connecting flange is fixedly connected to the bridge housing; the motor rear cover is provided with a connecting boss, and the connecting boss is fixedly connected to the bracket on the bridge housing.

[0017] According to one embodiment of the present invention, a first bearing is provided on the inner side of the motor rear cover, a second bearing is provided on the partition, and the first shaft is passed through the first bearing and the second bearing; a third bearing is also provided on the partition, a fourth bearing is provided on the inner side of the reducer rear cover, and the second shaft is passed through the third bearing and the fourth bearing.

[0018] According to one embodiment of the present invention, the first shaft outer sleeve is provided with an oil seal, and the oil seal is provided on the partition plate.

[0019] A vehicle comprises the above-mentioned electric drive axle transmission system.

[0020] Compared with the prior art, the advantages and beneficial effects of the embodiments of the present invention are:

[0021] The electric drive axle transmission system and vehicle provided by the embodiments of the present invention integrate the motor housing and reducer housing of the traditional structure, eliminate the original connection structure between the motor housing and the reducer housing and part of the bearing seat, shorten the axial span of the transmission system, and reduce assembly errors.

[0022] In an electric drive axle transmission system and vehicle provided by an embodiment of the present invention, a first driving gear is connected to a first shaft (an integrated shaft of a motor and reducer) by adopting an interference fit between a longer optical shaft segment and a light hole segment of the inner bore of the first driving gear for radial positioning, thereby ensuring the coaxiality of the gear and the shaft while providing axial positioning; a shorter external spline segment is connected to an internal spline segment of the inner bore of the first driving gear, thereby ensuring that the first driving gear and the first shaft do not slip when the transmission system is subjected to an impact; and by adjusting the interference between the optical shaft segment and the light hole segment, the circumferential static friction force generated by the interference can transmit torque, and the connection is stable and reliable.

[0023] In the electric drive axle transmission system and vehicle provided by the embodiments of the present invention, the first shaft (the motor-reducer integrated shaft) can be first passed through the oil seal mounting hole on the partition and the inner ring of the second bearing before the first driving gear is press-fitted during assembly. This facilitates installation and eliminates the need to design the dimensions of the oil seal mounting hole (and oil seal) and the inner ring of the second bearing to be larger than the major diameter of the first driving gear, thereby avoiding waste of bearing performance and the problem of easy aging of the oil seal.

[0024] In the electric drive axle transmission system and vehicle provided by the embodiments of the present invention, the motor-reducer integrated housing is provided with a connecting flange connected to the bridge housing, and the connecting boss is integrated on the rear cover of the motor, so that the entire transmission system can be integrated with the bridge housing of the drive axle, and the overall layout is more compact; the pressure distribution of the connecting flange and the bridge housing joint surface can also be changed by adjusting the position tolerance of the normal direction of the connecting boss joint surface, thereby ensuring the tightness of the connection between the motor-reducer integrated housing and the bridge housing, and the connection is simple, reliable and easy to implement.

[0025] The electric drive axle transmission system and vehicle provided by the embodiments of the present invention have a high degree of integration between the motor reducer integrated housing and the drive axle housing, reducing many connecting brackets, bosses and other structures; the transmission components are compactly arranged, occupying a small space, which is conducive to cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0027] FIG1 is a schematic structural diagram of an electric drive axle transmission system according to an embodiment of the present invention;

[0028] FIG2 is a schematic structural diagram of a first shaft of an electric drive axle transmission system according to an embodiment of the present invention;

[0029] FIG3 is a perspective view of an electric drive axle transmission system including an axle housing provided by an embodiment of the present invention;

[0030] FIG4 is a perspective view of an electric drive axle transmission system without an axle housing provided by an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. First shaft; 11. First driving gear; 12. First optical axis section; 13. First external spline section; 14. Threaded section; 15. Limit nut; 16. Oil seal; 161. Oil seal position; 17. Motor rotor subassembly; 171. Motor rotor locking nut; 172. Rotor locking thread; 173. Rotor mounting slot; 18. Shaft collar; 2. Second shaft; 21. First driven gear; 22. Second driving gear; 3. Motor reducer integrated housing; 31. Motor cavity; 32. Reducer Cavity; 33. Partition; 34. Motor rear cover; 35. Reducer rear cover; 36. Connection port; 37. Connection flange; 38. Connection boss; 4. Bridge housing; 41. Differential rear cover; 42. Bracket; 5. Differential; 50. Differential body; 51. Second driven gear; 52. Left differential bearing; 53. Right differential bearing; 61. First bearing; 611. First bearing position; 62. Second bearing; 621. Second bearing position; 63. Third bearing; 64. Fourth bearing. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present invention and is not intended to limit the present invention. Indeed, it will be apparent to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is intended that the present invention encompasses such modifications and variations as come within the scope of the appended claims and their equivalents.

[0034] In the description of the present invention, the words "first", "second" and similar terms do not indicate any order, quantity or importance, but are only used to distinguish different components. The words "include" or "comprises" and similar terms mean that the element or object preceding the word includes the elements or objects listed after the word and their equivalents, but does not exclude other elements or objects. The directions or positions indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like are based on the directions or positions shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention. The terms "connected", "connected" and "disposed" used in the present invention should be understood in a broad sense. For example, they can mean fixed connection or detachable connection; direct connection or indirect connection through an intermediate component; wired electrical connection, radio connection or wireless communication signal connection. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0035] As shown in Figure 1, an embodiment of the present invention provides an electric drive axle transmission system, comprising a motor-reducer integrated housing 3 and a first shaft 1 and a second shaft 2 located within the motor-reducer integrated housing 3. The motor-reducer integrated housing 3 has a motor cavity 31 and a reducer cavity 32. The first shaft 1 is located within the motor cavity 31 and its distal end extends into the reducer cavity 32. The second shaft 2 is located within the reducer cavity 32.

[0036] The electric drive axle transmission system provided by an embodiment of the present invention has a motor-reducer integrated shell 3 that integrates the motor housing and the reducer housing of the traditional structure. The first shaft 1 is the motor-reducer integrated shaft, which is both the output shaft of the motor and the input shaft of the reducer. The original connection structure between the motor housing and the reducer housing and part of the bearing seat are eliminated, thereby shortening the axial span of the transmission system and reducing the assembly error.

[0037] In this embodiment, as shown in Figures 1 and 2, the end of the first shaft 1 is sleeved with a first driving gear 11, which is located in the reducer cavity 32. The inner wall of the inner hole of the first driving gear 11 is provided with a first optical hole section and a first internal spline section in sequence along the axial direction of the inner hole. The end of the first shaft 1 is provided with a first optical axis section 12 and a first external spline section 13 corresponding to the first optical hole section and the first internal spline section, respectively. The first optical hole section and the first optical axis section 12 have an interference fit, and the first external spline section 13 has a clearance fit with the first internal spline section. In this embodiment, the direction from the motor cavity 31 to the reducer cavity 32 is the first direction, and the first optical axis section 12 and the first external spline section 13 are arranged along this first direction.

[0038] The second shaft 2 is provided with a first driven gear 21 and a second driving gear 22 . The first driven gear 21 is engaged with the first driving gear 11 to transmit power from the first shaft 1 and is connected to the gear of the differential in the axle housing of the drive axle through the second driving gear 22 .

[0039] In the electric drive axle transmission system provided by an embodiment of the present invention, the connection method between the first driving gear 11 and the first shaft 1 (the motor-reducer integrated shaft) adopts an interference fit between a longer optical shaft section and a light hole section of the inner hole of the first driving gear 11 for radial positioning, ensuring the coaxiality of the gear and the shaft while providing axial positioning; a shorter external spline section is connected to the internal spline section of the inner hole of the first driving gear 11 to ensure that there is no slippage between the first driving gear 11 and the first shaft 1 when the transmission system is subjected to impact; and by adjusting the interference between the optical shaft section and the light hole section, the circumferential static friction force generated by the interference can transmit torque, and the connection is stable and reliable.

[0040] The interference fit between the first optical hole section of the first driving gear 11 and the first optical axis section 12 of the first shaft 1 already prevents displacement of the first driving gear 11 along the axial direction (i.e., the first direction) of the first shaft 1. To further prevent axial displacement of the first driving gear 11 along the first shaft 1, in one embodiment of the present invention, as shown in Figure 2, the end of the first shaft 1 is provided with a threaded section 14, on which a retaining nut 15 is mounted. The retaining nut 15 abuts against the outer side of the first driving gear 11, limiting displacement of the first driving gear 11 along the axial direction (i.e., the first direction) of the first shaft 1 and preventing the first driving gear 11 from disengaging from the first shaft 1. Preferably, the end of the threaded section 14 is provided with a flat portion. When the retaining nut 15 is installed, the flat portion is gripped to prevent rotation of the first shaft 1, facilitating installation of the retaining nut 15. After the retaining nut 15 is in place, the retaining nut 15 is riveted at the flat portion, so that the edge of the retaining nut 15 engages the flat portion, preventing the retaining nut 15 from loosening.

[0041] In one embodiment of the present invention, as shown in Figures 1, 3, and 4, the electric drive axle transmission system further includes a drive axle housing 4. A differential 5 is housed within the housing 4. The differential 5 includes a second driven gear 51 that meshes with the second driving gear 22. Specifically, the differential 5 comprises a differential body 50, a second driven gear 51, a left differential bearing 52, and a right differential bearing 53. A differential rear cover 41 is provided on the side of the housing 4 to facilitate maintenance and assembly of the differential 5. The differential body 50 is provided with a left differential bearing, a second driven gear mounting journal, and a right differential bearing along the first direction. The second driven gear 51 is provided with a light hole that has an interference fit with the second driven gear mounting journal and is secured to the differential body 50 via fasteners. The second driven gear 51 meshes with the second driving gear 22 on the second shaft 2. The inner ring of the left differential bearing 52 is interference fit with the left differential bearing, and the right differential bearing 53 is interference fit with the right differential bearing. The differential body 50 is provided with an internal spline, which can be connected to the half shaft to transmit motion and power.

[0042] In one embodiment of the present invention, as shown in FIG1 , a partition 33 is provided between the motor cavity 31 and the reducer cavity 32 . The partition 33 is provided with an oil seal mounting hole, through which the first shaft 1 passes. As shown in FIG1 and FIG4 , a motor rear cover 34 is provided at the end of the motor cavity 31 away from the partition 33 , and a reducer rear cover 35 is provided at the end of the reducer cavity 32 away from the partition 33 . A connecting port 36 is provided on the side of the reducer cavity 32 , and the second driving gear 22 is located inside the connecting port 36 . The motor rear cover 34 , the reducer rear cover 35 , and the motor-reducer integrated housing 3 are all detachably connected, such as by bolts, to facilitate installation and maintenance of the first shaft 1 and the second shaft 2 inside. The connecting port 36 is used to connect the second driving gear 22 to the second driven gear 51 of the differential 5 .

[0043] In one embodiment of the present invention, as shown in FIG4 , a connecting flange 37 is provided on the outer side of the connecting port 36 , and the connecting flange 37 is fixedly connected to the axle housing 4 . The motor rear cover 34 is provided with a connecting boss 38 , and the connecting boss 38 is fixedly connected to a bracket 42 fixed to the axle housing 4 , for example, by bolts.

[0044] In the electric drive axle transmission system provided by the embodiment of the present invention, the motor-reducer integrated housing 3 is provided with a connecting flange 37 connected to the axle housing 4, and the motor rear cover 34 is integrated with a connecting boss 38, so that the entire transmission system can be integrated with the axle housing 4 of the drive axle, and the overall layout is more compact; the connecting flange 37 eliminates some bolt holes that cannot be installed due to interference, and adds bolt holes on the connecting boss 38 of the motor rear cover 34. By adjusting the position tolerance of the normal direction of the connecting boss 38 joint surface, the pressure distribution on the joint surface between the connecting flange 37 and the axle housing 4 can be changed to ensure the tightness of the connection between the motor-reducer integrated housing 3 and the axle housing 4. The connection is simple, reliable, and easy to implement. The motor-reducer integrated housing 3 is highly integrated with the axle housing 4 of the drive axle, eliminating many connecting brackets, bosses, and other structures; the transmission components are compactly arranged, occupying little space, which is conducive to cost reduction.

[0045] In one embodiment of the present invention, as shown in Figure 1, a first bearing 61 is provided on the inner side of the motor rear cover 34, a second bearing 62 is provided on the outer side of the oil seal mounting hole of the partition 33, and the first shaft 1 is inserted into the first and second bearings 61 and 62. A third bearing 63 is also provided on the partition 33, and a fourth bearing 64 is provided on the inner side of the reducer rear cover 35, and the second shaft 2 is inserted into the third and fourth bearings 63 and 64. Furthermore, an oil seal 16 is provided on the outer side of the first shaft 1, which is installed in the oil seal mounting hole on the partition 33. The oil seal mounting hole and the outer ring of the oil seal 16 have an interference fit, thus separating the motor cavity 31 and the reducer cavity 32 into two sealed, independent cavities.

[0046] Specifically, as shown in Figures 1 and 2, the first shaft 1 is provided with a limit nut 15, a first driving gear 11, a second bearing 62, an oil seal 16, a motor rotor sub-assembly 17, a motor rotor locking nut 171, and a first bearing 61. The first shaft 1 has a first bearing position 611, a rotor locking thread 172, a rotor mounting groove 173, a shaft ring 18, an oil seal position 161, a second bearing position 621, a first optical axis segment 12, a first external spline segment 13, and a threaded segment 14 along the first direction. The motor rotor sub-assembly 17 is pressed against the collar 18 on the right side, and is pressed against the motor rotor locking nut 171 on the left side; the motor rotor locking nut 171 is mounted on the rotor locking thread 172, and is prevented from loosening by riveting the motor rotor locking nut 172; the inner ring of the first bearing 61 is interference fit with the first bearing position 611; the oil seal 16 is mounted on the oil seal position 161; the inner ring of the second bearing 62 is interference fit with the second bearing position 621; the left side of the first driving gear 11 is pressed against the inner ring of the second bearing 62, and the right side is pressed against the limit nut 15; the limit nut 15 is mounted on the threaded section 14, and is prevented from loosening by riveting the limit nut 15.

[0047] In the electric drive axle transmission system provided by an embodiment of the present invention, the first shaft 1 (the motor-reducer integrated shaft) can be first passed through the oil seal mounting hole on the partition plate 33 and the inner ring of the second bearing 62 before being press-fitted onto the first driving gear 11 during assembly. This facilitates installation and eliminates the need to design the dimensions of the oil seal mounting hole, the oil seal 16, and the inner ring of the second bearing 62 to be larger than the major diameter of the first driving gear 11, thereby avoiding waste of bearing performance and the problem of oil seal aging.

[0048] In one embodiment of the present invention, the inner wall of the inner bore of the first driven gear 21 is provided with a second aperture section and a second internal spline section, sequentially along the axial direction of the inner bore. The end of the second shaft 2 is provided with a second optical shaft section and a second external spline section, corresponding to the second aperture section and the second internal spline section, respectively. The second aperture section and the second optical shaft section have an interference fit, while the second external spline section and the second internal spline section have a clearance fit. Similar to the fit between the first shaft 1 and the first driving gear 11, the connection between the second shaft 2 and the first driven gear 21 utilizes an interference fit between the longer optical shaft section and the aperture section of the inner bore of the first driven gear 21 for radial positioning, ensuring coaxiality between the gear and shaft while also providing axial positioning. The shorter external spline section connects to the internal spline section of the inner bore of the first driven gear 21, ensuring that the first driven gear 21 and the second shaft 2 do not slip when the transmission system is subjected to impact. Furthermore, by adjusting the interference between the optical shaft section and the aperture section, the circumferential static friction generated by the interference fit can transmit torque, resulting in a stable and reliable connection.

[0049] Specifically, the second shaft 2 is equipped with a third bearing 63, a first driven gear 21, a second driving gear 22, and a fourth bearing 64. Along the first direction, the second shaft 2 comprises a third bearing position, a second optical axis section, a second external spline section, a first driven gear 21, a second driving gear 22, and a fourth bearing position. The right side of the first driven gear 21 presses against the shoulder of the second driving gear 22, while the left side presses against the inner ring of the third bearing 63, meshing with the first driving gear 11. The inner ring of the third bearing 63 has an interference fit with the third bearing position, and the inner ring of the fourth bearing 64 has an interference fit with the fourth bearing position.

[0050] Furthermore, the outer ring of the first bearing 61 is clearance-fitted with the first bearing seat on the inner side of the motor rear cover 34, the outer ring of the second bearing 62 is clearance-fitted with the second bearing seat on the outer side of the partition 33, the outer ring of the third bearing 63 is clearance-fitted with the third bearing seat on the outer side of the partition 33, and the outer ring of the fourth bearing 64 is clearance-fitted with the fourth bearing seat on the inner side of the reducer rear cover 35. The differential bearing cover is connected to the differential bearing cover support through fasteners, and tightens the outer rings of the differential left bearing 52 and the differential right bearing 53.

[0051] The present invention also provides a vehicle comprising the above-mentioned electric drive axle transmission system.

[0052] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An electric drive axle transmission system, characterized in that: It comprises a motor reducer integrated shell (3) and a first shaft (1) and a second shaft (2) located inside the motor reducer integrated shell (3); The motor-reducer integrated housing (3) has a motor cavity (31) and a reducer cavity (32) inside; the first shaft (1) is located in the motor cavity (31) and the end thereof extends into the reducer cavity (32), and the second shaft (2) is located in the reducer cavity (32); A first driving gear (11) is sleeved on the end of the first shaft (1); the inner wall of the inner hole of the first driving gear (11) is provided with a first light hole section and a first internal spline section in sequence along the axial direction of the inner hole; a first light axis section (12) and a first external spline section (13) corresponding to the first light hole section and the first internal spline section respectively are provided at the end of the first shaft (1); the first light hole section and the first light axis section (12) are interference fit, and the first external spline section (13) and the first internal spline section are clearance fit; The second shaft (2) is provided with a first driven gear (21) and a second driving gear (22), and the first driven gear (21) is meshed with the first driving gear (11).

2. The electric drive axle transmission system according to claim 1, characterized in that: A threaded section (14) is also provided at the end of the first shaft (1), and a limiting nut (15) is provided on the threaded section (14).

3. The electric drive axle transmission system according to claim 2, characterized in that: The end of the threaded section (14) is provided with a flat portion.

4. The electric drive axle transmission system according to claim 1, characterized in that: The inner wall of the inner hole of the first driven gear (21) is provided with a second light hole section and a second internal spline section in sequence along the axial direction of the inner hole; the end of the second shaft (2) is provided with a second light shaft section and a second external spline section corresponding to the second light hole section and the second internal spline section respectively; the second light hole section and the second light shaft section are interference fit, and the second external spline section and the second internal spline section are clearance fit.

5. The electric drive axle transmission system according to claim 1, characterized in that: It also comprises an axle housing (4), wherein a differential (5) is provided in the axle housing (4), wherein the differential (5) is provided with a second driven gear (51), and wherein the second driven gear (51) is meshed with the second driving gear (22).

6. The electric drive axle transmission system according to any one of claims 1 to 5, characterized in that: A partition (33) is provided between the motor cavity (31) and the reducer cavity (32); a motor rear cover (34) is provided at one end of the motor cavity (31) away from the partition (33); a reducer rear cover (35) is provided at one end of the reducer cavity (32) away from the partition (33); a connecting port (36) is provided on a side surface of the reducer cavity (32); and the second driving gear (22) is located inside the connecting port (36).

7. The electric drive axle transmission system according to claim 6, characterized in that: A connecting flange (37) is provided on the outside of the connecting port (36), and the connecting flange (37) is fixedly connected to the bridge housing (4); the motor rear cover (34) is provided with a connecting boss (38), and the connecting boss (38) is fixedly connected to a bracket (42) on the bridge housing (4).

8. The electric drive axle transmission system according to claim 6, characterized in that: A first bearing (61) is provided on the inner side of the motor rear cover (34), a second bearing (62) is provided on the partition (33), and the first shaft (1) is inserted into the first bearing (61) and the second bearing (62); a third bearing (63) is also provided on the partition (33), a fourth bearing (64) is provided on the inner side of the reducer rear cover (35), and the second shaft (2) is inserted into the third bearing (63) and the fourth bearing (64).

9. The electric drive axle transmission system according to claim 8, characterized in that: The outer sleeve of the first shaft (1) is provided with an oil seal (16), and the oil seal (16) is arranged on the partition plate (33).

10. A vehicle, characterized in that: It comprises the electric drive axle transmission system according to any one of claims 1 to 9.

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