Distributed electric drive structure for single-stage gear speed reduction transmission

Abstract

The invention discloses a distributed electric drive structure for single-stage gear speed reduction transmission, which comprises a left electric drive assembly and a right electric drive assembly which have the same structure and are symmetrically arranged, and the left electric drive assembly and the right electric drive assembly are integrally designed; a motor in the left electric drive assembly and a motor in the right electric drive assembly can independently control output of torque or rotating speed, and speed reduction and torque increase are achieved through a first-stage large speed ratio. A transmission shaft in the left electric drive assembly and a transmission shaft in the right electric drive assembly are connected with corresponding main reduction gears through splines so that power can be output to a left wheel and a right wheel, and the vehicle can be driven to run. The device has the advantages of being compact in structure, stable in transmission, high in assembly efficiency and the like, and the utilization efficiency of battery energy is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric motor drive, and in particular to a distributed electric drive structure of a single-stage gear reduction transmission. Background Art

[0002] In the field of electric drive technology, distributed system design is an important technical means, which achieves efficient control and management of the system by distributing the power source to each drive unit. This design method is widely used in electric vehicles, electric ships, electric aircraft and other fields. In the prior art, a distributed electric drive system with two motors in parallel or series is usually used. For example, the left motor and the right motor can drive the left wheel and the right wheel respectively to achieve four-wheel drive of the vehicle. Alternatively, the two motors can be distributedly driven through a planetary gear to achieve stronger and smoother power output. Due to the use of two motors for driving, the number of parts in the system is large, which not only increases the complexity and cost of the system, but also reduces the reliability of the system. Due to the use of a multi-stage transmission system, the efficiency loss of the system is large, which has a direct impact on the utilization efficiency of battery energy. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a distributed electric drive structure with a single-stage gear reduction transmission that has a compact structure, stable transmission and high assembly efficiency, in view of the drawbacks of the existing electric drive structure, such as a large number of parts, a complex structure and a low battery utilization rate.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A distributed electric drive structure with a single-stage gear reduction transmission comprises a left electric drive assembly and a right electric drive assembly of identical structure and symmetrical arrangement, wherein the left electric drive assembly and the right electric drive assembly are integrated into one through an integrated design; the motor in the left electric drive assembly and the motor in the right electric drive assembly can control the output of torque or speed separately, and achieve speed reduction and torque increase through a first-stage large speed ratio; the transmission shaft in the left electric drive assembly and the transmission shaft in the right electric drive assembly are both connected to the corresponding main reduction gear through a spline to achieve power output to the left and right wheels to drive the vehicle.

[0006] As a further improvement of the present invention, the left electric drive assembly includes a left motor shaft, a left main reduction gear and a left transmission shaft, the left motor shaft is integrated with a gear; the left motor shaft is meshed and transmitted with the left main reduction gear through the gear; one end of the left transmission shaft is connected to the center of the left main reduction gear through a spline, and the other end of the left transmission shaft is connected to the left wheel.

[0007] As a further improvement of the present invention, the left electric drive assembly also includes: a left end cover, a left casing and a left reducer housing, one end of the left casing is provided with a detachable left end cover, the other end of the left casing is connected to the left reducer housing, and the left casing and the left reducer housing are connected to each other; the left motor shaft is rotatably arranged in the left casing, and one end of the left motor shaft is close to the left end cover; the left main reduction gear is rotatably arranged in the left reducer housing, and the other end of the left motor shaft is meshed and transmitted with the left main reduction gear in the left casing through a gear.

[0008] As a further improvement of the present invention, a third bearing is provided between the left motor shaft and the left end cover, a first bearing and a second bearing are provided between the left motor shaft and the left housing, and the first bearing and the second bearing are respectively located on both sides of the meshing position of the left motor shaft and the left main reduction gear, so as to realize three-bearing support of the left motor shaft;

[0009] Alternatively, a first bearing is provided between the left motor shaft and the left housing, and the first bearing is located outside the meshing position of the left motor shaft and the left main reduction gear, so as to realize two-bearing straddle support of the left motor shaft;

[0010] Alternatively, a second bearing is provided between the left motor shaft and the left housing, and the second bearing is located on the inner side of the meshing point between the left motor shaft and the left main reduction gear, so as to realize two-bearing cantilever support of the left motor shaft.

[0011] As a further improvement of the present invention, a fourth bearing and a fifth bearing are provided between the left main reduction gear and the left reducer housing, and the fourth bearing and the fifth bearing are respectively located at both ends of the connection between the left main reduction gear and the left transmission shaft.

[0012] As a further improvement of the present invention, the right electric drive assembly includes: a right motor shaft, a right main reduction gear and a right transmission shaft, the right motor shaft is integrated with a gear; the right motor shaft is meshed and transmitted with the right main reduction gear through the gear; one end of the right transmission shaft is connected to the center of the right main reduction gear through a spline, and the other end of the right transmission shaft is connected to the right wheel.

[0013] As a further improvement of the present invention, the right electric drive assembly also includes: a right end cover, a right casing and a right reducer casing, one end of the right casing is provided with a detachable right end cover, the other end of the right casing is connected to the right reducer casing, and the right casing and the right reducer casing are connected to each other; the right motor shaft is rotatably arranged in the right casing, and one end of the right motor shaft is close to the right end cover; the right main reduction gear is rotatably arranged in the right reducer casing, and the other end of the right motor shaft is meshed and transmitted with the right main reduction gear in the right casing through a gear.

[0014] As a further improvement of the present invention, an eighth bearing is provided between the right motor shaft and the right end cover; a sixth bearing and a seventh bearing are provided between the right motor shaft and the right housing, and the sixth bearing and the seventh bearing are respectively located on both sides of the meshing point between the right motor shaft and the right main reduction gear, so as to realize three-bearing support of the right motor shaft;

[0015] Alternatively, a sixth bearing is provided between the right motor shaft and the right housing, and the sixth bearing is located outside the meshing position of the right motor shaft and the right main reduction gear, so as to realize two-bearing straddle support of the right motor shaft;

[0016] Alternatively, a seventh bearing is provided between the right motor shaft and the right housing, and the seventh bearing is located on the inner side of the meshing point between the right motor shaft and the right main reduction gear, so as to realize two-bearing cantilever support of the right motor shaft.

[0017] As a further improvement of the present invention, a ninth bearing and a tenth bearing are provided between the right main reduction gear and the right reducer housing, and the ninth bearing and the tenth bearing are respectively located at both ends of the connection between the right main reduction gear and the right transmission shaft.

[0018] As a further improvement of the present invention, the left reducer housing is connected and fixed to the right reducer housing, the left motor driving the left motor shaft and the right motor driving the right motor shaft are away from each other, and the left main reduction gear and the right main reduction gear are close to each other;

[0019] Alternatively, the left end cover is connected and fixed to the right end cover, the left motor driving the left motor shaft and the right motor driving the right motor shaft are close to each other, and the left main reduction gear and the right main reduction gear are away from each other.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] The distributed electric drive structure of the single-stage gear reduction transmission of the present invention (1) simplifies the system structure: through integrated design, the traditional two-motor parallel-axis distributed electric drive or two-motor planetary gear distributed electric drive system with left-right symmetry is optimized into a distributed electric drive structure with a reducer as a single-stage transmission, which greatly simplifies the system structure and reduces the number of parts, thereby reducing the complexity of the system. (2) Improves reliability: Due to the reduction in the number of parts, the reliability of the system is improved, the failure rate is reduced, thereby improving the stability and service life of the system. (3) Improves efficiency: Due to the use of a single-stage transmission system, the efficiency loss caused by a multi-stage transmission system is avoided, thereby improving the efficiency of the system and directly improving the utilization efficiency of battery energy. (4) Reduces cost: Due to the use of a single motor for driving, compared with the use of two motors for driving in the prior art, the cost of the system is reduced, which has important economic value for application scenarios such as electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structural principle of the distributed electric drive structure of the single-stage gear reduction transmission in the specific embodiment 1 of the present invention;

[0023] Figure 2 It is a schematic diagram of the structural principle of the distributed electric drive structure of the single-stage gear reduction transmission in the specific embodiment 2 of the present invention;

[0024] Legend: 1. First bearing; 2. Second bearing; 3. Third bearing; 4. Left motor shaft; 5. Left main reduction gear; 6. Fourth bearing; 7. Fifth bearing; 8. Left end cover; 9. Left casing; 10. Left reducer housing; 11. Left transmission shaft; 12. Sixth bearing; 13. Seventh bearing; 14. Eighth bearing; 15. Right motor shaft; 16. Right main reduction gear; 17. Ninth bearing; 18. Tenth bearing; 19. Right end cover; 20. Right casing; 21. Right reducer housing; 22. Right transmission shaft; 23. Rotor core. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0026] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] Example 1

[0029] like Figure 1As shown, the distributed electric drive structure of the single-stage gear reduction transmission of the present invention includes a left electric drive assembly and a right electric drive assembly with the same structure and symmetrical arrangement, and the left electric drive assembly and the right electric drive assembly are integrated into one through an integrated design. The permanent magnet synchronous motor in the left electric drive assembly and the permanent magnet synchronous motor in the right electric drive assembly can control the output of torque or speed separately, and achieve speed reduction and torque increase through a large speed ratio; the transmission shaft in the left electric drive assembly and the transmission shaft in the right electric drive assembly are connected to the corresponding main reduction gear through a spline to output power to the left and right wheels to drive the vehicle.

[0030] In this embodiment, an integrated design is used to present a left-right symmetrical distribution layout. The motors at the left and right ends output power, and after a single-stage reduction, the power is output to the left and right half-axles of the vehicle to drive the vehicle forward or backward.

[0031] like Figure 1 As shown, the left electric drive assembly includes a left motor shaft 4, a left main reduction gear 5 and a left transmission shaft 11, and a gear is integrated on the left motor shaft 4. It can be understood that the permanent magnet synchronous motor includes a stator winding and a rotor core 23, and the rotor core 23 is assembled with the motor shaft. After power is turned on, the stator winding generates a magnetic field, which interacts with the rotor core 23 to generate rotation, thereby driving the motor shaft to rotate. The left motor shaft 4 is meshed with the left main reduction gear 5 through a gear. One end of the left transmission shaft 11 is connected to the center of the left main reduction gear 5 through a spline, and the other end of the left transmission shaft 11 is connected to the left wheel.

[0032] In this embodiment, the left electric drive assembly further includes: a left end cover 8, a left housing 9 and a left reducer housing 10. A detachable left end cover 8 is provided at one end of the left housing 9, and the other end of the left housing 9 is connected to the left reducer housing 10, and the left housing 9 and the left reducer housing 10 are interconnected; or, the left housing 9 and the left reducer housing 10 can be designed as an integrated unit to improve the integration. The left motor shaft 4 is rotatably arranged in the left housing 9, and one end of the left motor shaft 4 is close to the left end cover 8; the left motor shaft 4 and the rotor core can be installed by opening the left end cover 8, which is convenient and quick. The left main reduction gear 5 is rotatably arranged in the left reducer housing 10, and the end of the left motor shaft 4 is meshed and driven with the left main reduction gear 5 in the left housing 9 through a gear. The left main reduction gear 5 is used for single-stage reduction, that is, the power is transmitted to the left wheel through the first-stage gear to reduce speed and increase torque, which can play the role of a differential or differential lock to a certain extent, helping the vehicle to have better driving quality and off-road passing ability.

[0033] In this embodiment, a third bearing 3 is provided between the left motor shaft 4 and the left end cover 8, and a first bearing 1 and a second bearing 2 are provided between the end of the left motor shaft 4 connected to the left main reduction gear 5 and the left housing 9, and the first bearing 1 and the second bearing 2 are respectively located on both sides of the meshing point of the left motor shaft 4 and the left main reduction gear 5, so as to realize three-bearing support of the left motor shaft 4. The left motor shaft 4 integrates the gears into one body, and is set as an integrated shaft three-bearing support mode in the reducer system, which effectively improves the meshing stiffness of the gears and reduces the amount of gear meshing misalignment. In other embodiments, the left motor shaft 4 can also adopt a straddle-type or swing-arm type two-bearing support installation mode. For example, a first bearing 1 is provided between the left motor shaft 4 and the left housing 9, and the first bearing 1 is located on the outside of the meshing point of the left motor shaft 4 and the left main reduction gear 5, so as to realize the two-bearing straddle-type support installation of the left motor shaft 4. Alternatively, a second bearing 2 is provided between the left motor shaft 4 and the left housing 9, and the second bearing 2 is located on the inner side of the meshing point between the left motor shaft 4 and the left main reduction gear 5, so as to realize the two-bearing cantilever support installation of the left motor shaft 4.

[0034] In this embodiment, a fourth bearing 6 and a fifth bearing 7 are provided between the left main reduction gear 5 and the left reducer housing 10 , and the fourth bearing 6 and the fifth bearing 7 are respectively located at the two ends of the connection between the left main reduction gear 5 and the left transmission shaft 11 .

[0035] like Figure 1 As shown, the right electric drive assembly includes: a right motor shaft 15, a right main reduction gear 16 and a right transmission shaft 22, and a gear is integrated on the right motor shaft 15. The right motor shaft 15 is meshed with the right main reduction gear 16 through a gear. One end of the right transmission shaft 22 is connected to the center of the right main reduction gear 16 through a spline, and the other end of the right transmission shaft 22 is connected to the right wheel.

[0036] In this embodiment, the right electric drive assembly further includes: a right end cover 19, a right housing 20 and a right reducer housing 21. A removable right end cover 19 is provided at one end of the right housing 20, and the other end of the right housing 20 is connected to the right reducer housing 21, and the right housing 20 and the right reducer housing 21 are connected to each other; or, the right housing 20 and the right reducer housing 21 can be designed as an integrated unit to improve the integration. The right motor shaft 15 is rotatably arranged in the right housing 20, and one end of the right motor shaft 15 is close to the right end cover 19. The right main reduction gear 16 is rotatably arranged in the right reducer housing 21, and the end with a gear on the right motor shaft 15 is meshed with the right main reduction gear 16 in the right housing 20 for transmission. The right main reduction gear 16 is used for single-stage reduction, that is, the first-stage gear is used to reduce speed and increase torque, and the power is transmitted to the right wheel, which can play the role of a differential or differential lock to a certain extent, helping the vehicle to have better driving quality and off-road passing ability.

[0037] In this embodiment, an eighth bearing 14 is provided between the right motor shaft 15 and the right end cover 19, and a sixth bearing 12 and a seventh bearing 13 are provided between one end of the right motor shaft 15 connected to the right main reduction gear 16 and the right housing 20, and the sixth bearing 12 and the seventh bearing 13 are respectively located on both sides of the meshing point of the right motor shaft 15 and the right main reduction gear 16, so as to realize the three-bearing support of the right motor shaft 15. The right motor shaft 15 integrates the gears into one body, and is set as an integrated shaft three-bearing support mode in the reducer system, which effectively improves the meshing stiffness of the gears and reduces the gear meshing misalignment. In other embodiments, the right motor shaft 15 can also adopt a straddle-type or swing-arm type two-bearing support installation mode. For example, a sixth bearing 12 is provided between the right motor shaft 15 and the right housing 20, and the sixth bearing 12 is located on the outside of the meshing point of the right motor shaft 15 and the right main reduction gear 16, so as to realize the two-bearing straddle-type support installation of the right motor shaft 15. Alternatively, a seventh bearing 13 is provided between the right motor shaft 15 and the right housing 20, and the seventh bearing 13 is located on the inner side of the meshing point between the right motor shaft 15 and the right main reduction gear 16, so as to realize the two-bearing cantilever support of the right motor shaft 15.

[0038] In this embodiment, a ninth bearing 17 and a tenth bearing 18 are provided between the right main reduction gear 16 and the right reducer housing 21 , and the ninth bearing 17 and the tenth bearing 18 are respectively located at the two ends of the connection between the right main reduction gear 16 and the right transmission shaft 22 .

[0039] In this embodiment, the left reducer housing 10 is fixedly connected to the right reducer housing 21, the left motor driving the left motor shaft 4 and the right motor driving the right motor shaft 15 are away from each other, and the left main reduction gear 5 and the right main reduction gear 16 are close to each other.

[0040] like Figure 1 As shown, when the left motor shaft 4 and the right motor shaft 15 rotate in the direction indicated by the arrow in the figure, the driving force in the left electric drive assembly is transmitted to the left main reduction gear 5 via the left motor shaft 4, and then transmitted to the left transmission shaft 11, thereby driving the left wheel to rotate. At the same time, the driving force in the right electric drive assembly is transmitted to the right main reduction gear 16 via the right motor shaft 15, and then transmitted to the right transmission shaft 22, thereby driving the right wheel to rotate.

[0041] In this embodiment, the distributed electric drive structure is similar to a T-shaped structure as a whole, and the structural settings of the left electric drive assembly and the right electric drive assembly are completely symmetrical, which effectively reduces the number of parts such as gear shafts and bearings, while reducing the cost of finishing processes and other related design and manufacturing costs; the electric drive system has a small overall size, high integration, and high assembly rigidity, which reduces gear meshing losses, bearing losses, differential differential losses, and related lubrication oil circuit losses.

[0042] Example 2

[0043] like Figure 2As shown, the distributed electric drive structure of the single-stage gear reduction transmission of the present invention has a similar structural setting and working principle to the distributed electric drive structure in Example 1, and the main difference is that the left end cover 8 is connected and fixed to the right end cover 19, the left motor driving the left motor shaft 4 and the right motor driving the right motor shaft 15 are close to each other, and the left main reduction gear 5 and the right main reduction gear 16 are far away from each other. The distributed electric drive structure is similar to a door-type structure as a whole, and the structural settings of the left electric drive assembly and the right electric drive assembly are completely symmetrical, which improves the bottleneck problem of the Z-direction layout of the distributed electric drive system on the chassis of new energy vehicles, and the electronic control can be integrated between the two stacked reducers to improve the riding space.

[0044] In this embodiment, the driving force is controlled individually in a distributed manner, which improves the structural compactness and integration of the electric drive axle system, reduces the space occupancy rate, and saves the layout space of the entire vehicle; the high torque output of the electric drive axle system is achieved, the torque density is improved, and the demand for high torque output of the vehicle under special working conditions is well met.

[0045] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A distributed electric drive structure with a single-stage gear reduction transmission, characterized in that: It includes a left electric drive assembly and a right electric drive assembly with the same structure and symmetrical arrangement, and the left electric drive assembly and the right electric drive assembly are integrated into one through an integrated design; the motor in the left electric drive assembly and the motor in the right electric drive assembly can control the output of torque or speed respectively, and achieve speed reduction and torque increase through a first-level large speed ratio; the transmission shaft in the left electric drive assembly and the transmission shaft in the right electric drive assembly are connected to the corresponding main reduction gear through a spline to achieve power output to the left and right wheels to drive the vehicle.

2. The distributed electric drive structure of the single-stage gear reduction transmission according to claim 1 is characterized in that: The left electric drive assembly comprises a left motor shaft (4), a left main reduction gear (5) and a left transmission shaft (11); the left motor shaft (4) is integrated with a gear; the left motor shaft (4) is meshed with the left main reduction gear (5) through the gear for transmission; one end of the left transmission shaft (11) is connected to the center of the left main reduction gear (5) through a spline, and the other end of the left transmission shaft (11) is connected to the left wheel.

3. The distributed electric drive structure of the single-stage gear reduction transmission according to claim 2 is characterized in that: The left electric drive assembly further comprises: a left end cover (8), a left casing (9) and a left reducer casing (10); a detachable left end cover (8) is provided at one end of the left casing (9); the other end of the left casing (9) is connected to the left reducer casing (10); the left casing (9) and the left reducer casing (10) are in communication with each other; the left motor shaft (4) is rotatably arranged in the left casing (9), and one end of the left motor shaft (4) is close to the left end cover (8); the left main reduction gear (5) is rotatably arranged in the left reducer casing (10), and the other end of the left motor shaft (4) is meshed and transmitted with the left main reduction gear (5) in the left casing (9) through a gear.

4. The distributed electric drive structure of the single-stage gear reduction transmission according to claim 3 is characterized in that: A third bearing (3) is provided between the left motor shaft (4) and the left end cover (8), a first bearing (1) and a second bearing (2) are provided between the left motor shaft (4) and the left housing (9), and the first bearing (1) and the second bearing (2) are respectively located on both sides of the meshing position of the left motor shaft (4) and the left main reduction gear (5), so as to realize three-bearing support of the left motor shaft (4); Alternatively, a first bearing (1) is provided between the left motor shaft (4) and the left housing (9), and the first bearing (1) is located outside the meshing position of the left motor shaft (4) and the left main reduction gear (5), so as to achieve two-bearing straddle support for the left motor shaft (4); Alternatively, a second bearing (2) is provided between the left motor shaft (4) and the left housing (9), and the second bearing (2) is located on the inner side of the meshing position between the left motor shaft (4) and the left main reduction gear (5), so as to realize cantilever support of the left motor shaft (4) by two bearings.

5. The distributed electric drive structure of the single-stage gear reduction transmission according to claim 4 is characterized in that: A fourth bearing (6) and a fifth bearing (7) are provided between the left main reduction gear (5) and the left reducer housing (10), and the fourth bearing (6) and the fifth bearing (7) are respectively located at two ends of the connection between the left main reduction gear (5) and the left transmission shaft (11).

6. The distributed electric drive structure of the single-stage gear reduction transmission according to claim 3 is characterized in that: The right electric drive assembly comprises: a right motor shaft (15), a right main reduction gear (16) and a right transmission shaft (22); the right motor shaft (15) is integrated with a gear; the right motor shaft (15) is meshed with the right main reduction gear (16) through the gear for transmission; one end of the right transmission shaft (22) is connected to the center of the right main reduction gear (16) through a spline, and the other end of the right transmission shaft (22) is connected to the right wheel.

7. The distributed electric drive structure of the single-stage gear reduction transmission according to claim 6 is characterized in that: The right electric drive assembly further comprises: a right end cover (19), a right housing (20) and a right reducer housing (21); one end of the right housing (20) is provided with a detachable right end cover (19); the other end of the right housing (20) is connected to the right reducer housing (21); the right housing (20) and the right reducer housing (21) are in communication with each other; the right motor shaft (15) is rotatably arranged in the right housing (20), and one end of the right motor shaft (15) is close to the right end cover (19); the right main reduction gear (16) is rotatably arranged in the right reducer housing (21), and the other end of the right motor shaft (15) is meshed with the right main reduction gear (16) in the right housing (20) for transmission.

8. The distributed electric drive structure of the single-stage gear reduction transmission according to claim 7 is characterized in that: An eighth bearing (14) is provided between the right motor shaft (15) and the right end cover (19), a sixth bearing (12) and a seventh bearing (13) are provided between the right motor shaft (15) and the right housing (20), and the sixth bearing (12) and the seventh bearing (13) are respectively located on both sides of the meshing position of the right motor shaft (15) and the right main reduction gear (16), so as to realize three-bearing support of the right motor shaft (15); Alternatively, a sixth bearing (12) is provided between the right motor shaft (15) and the right housing (20), and the sixth bearing (12) is located outside the meshing position between the right motor shaft (15) and the right main reduction gear (16), so as to realize two-bearing straddle support of the right motor shaft (15); Alternatively, a seventh bearing (13) is provided between the right motor shaft (15) and the right housing (20), and the seventh bearing (13) is located on the inner side of the meshing position between the right motor shaft (15) and the right main reduction gear (16), so as to realize the two-bearing cantilever support of the right motor shaft (15).

9. The distributed electric drive structure of the single-stage gear reduction transmission according to claim 7 is characterized in that: A ninth bearing (17) and a tenth bearing (18) are provided between the right main reduction gear (16) and the right reducer housing (21), and the ninth bearing (17) and the tenth bearing (18) are respectively located at two ends of the connection between the right main reduction gear (16) and the right transmission shaft (22).

10. The distributed electric drive structure of the single-stage gear reduction transmission according to claim 7, characterized in that: The left reducer housing (10) is fixedly connected to the right reducer housing (21); the left motor driving the left motor shaft (4) and the right motor driving the right motor shaft (15) are separated from each other, and the left main reduction gear (5) and the right main reduction gear (16) are close to each other; Alternatively, the left end cover (8) and the right end cover (19) are connected and fixed, the left motor driving the left motor shaft (4) and the right motor driving the right motor shaft (15) are close to each other, and the left main reduction gear (5) and the right main reduction gear (16) are away from each other.

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