CN219600920U - Motor drive assembly, automobile transmission system and automobile - Google Patents

Abstract

The utility model provides a motor driving assembly, an automobile transmission system and an automobile, and relates to the technical field of automobiles. The motor drive assembly simultaneously realizes the functions of speed reduction and differential speed, has compact structure, small occupied space and light weight.

Description

Motor drive assembly, automobile transmission system and automobile

Technical Field

The utility model relates to the technical field of automobiles, in particular to a motor drive assembly, an automobile transmission system and an automobile.

Background

With the development of new energy automobile industry, electric automobiles have become a development trend. The current electric automobile's drive assembly generally includes motor, derailleur and differential mechanism, and the output moment of torsion and the rotational speed of motor pass through the derailleur and change the back, are transmitted left semi-axis and right semi-axis by transmission shaft, differential mechanism again in proper order, and under differential mechanism's effect, when automobile straight line was gone, left semi-axis and right semi-axis rotational speed were the same, and when the automobile was gone in the turn, differential mechanism made left semi-axis and right semi-axis's rotational speed different passively, guaranteed that the rotational speed of outside wheel is greater than inboard wheel promptly, guaranteed to go safety and quality. In the existing driving assembly, the transmission is usually designed to be mostly in parallel shaft layout, meanwhile, the bevel gear differential mechanism is used for power output, the transmission is in driving connection with the differential mechanism through a transmission shaft, the transmission and the differential mechanism are of independent structures, and the driving assembly occupies large volume and is heavy in weight, so that the light-weight development of an electric automobile is not facilitated.

Disclosure of Invention

The utility model aims to solve the problems of large occupied volume and heavy weight of the existing driving assembly.

In order to solve the above problems, the present utility model provides a motor driving assembly for driving a first half shaft and a second half shaft, where the motor driving assembly includes a motor, a transmission mechanism and a housing, the transmission mechanism includes a planet carrier assembly, a first sun gear, a first planet gear structure, a second planet gear, a third planet gear and a gear ring, the first half shaft is provided with the second sun gear, the second half shaft is provided with the third sun gear, two ends of the planet carrier assembly are rotationally connected with the housing, the gear ring is fixedly connected in the housing, the first planet gear structure and the third planet gear are respectively rotationally connected with the planet carrier assembly, the second planet gear is sleeved on a wheel shaft of the first planet gear structure or rotationally connected with the planet carrier assembly, the first planet gear structure is meshed with the gear ring, the second planet gear is meshed with the second sun gear, the third planet gear is respectively meshed with the second planet gear and the third sun gear, the motor is in driving connection with the first sun gear, and the first planet gear is meshed with the first planet structure.

Compared with the prior art, the motor drive assembly provided by the utility model has the following technical effects:

the first half shaft can be a left half shaft of an automobile, the second half shaft is a right half shaft of the automobile, the motor can be coaxially arranged on the first half shaft and is in driving connection with the first sun gear, the shell provides a carrier for the rotation of the planet carrier assembly and the fixation of the gear ring, when the motor rotates, the first sun gear drives the first planet gear to rotate, and then the first sun gear drives the first planet gear to rotate. Thus, the torque transmission path of the motor to the first half shaft is: the motor, the first sun gear, the first planetary gear structure, the planet carrier assembly, the second planetary gear, the second sun gear and the first half shaft; the path of the torque of the motor to the second half shaft is: the motor, the first sun gear, the first planetary gear structure, the planet carrier assembly, the second planetary gear, the third sun gear and the second half shaft, wherein when the automobile runs straight, the second planetary gear and the third planetary gear revolve around the first sun gear only under the drive of the planet carrier assembly, and the second planetary gear and the third planetary gear cannot rotate, so that the rotation speed of the first half shaft and the second half shaft is the same when the automobile runs; when the automobile turns and runs, the second planet wheel and the third planet wheel revolve and simultaneously rotate passively, so that different rotation speeds of the first half shaft and the second half shaft are achieved, and the functions of a traditional speed reducer and a traditional differential are achieved. The transmission mechanism in the motor drive assembly integrates a speed reduction function and a differential function, a transmission shaft between a traditional speed reducer and a differential mechanism is abandoned, a half-shaft bevel gear and a planetary bevel gear which are arranged at right angles in the traditional differential mechanism are also eliminated, all gears in the motor drive assembly can be round gears with parallel axes, the structure is more compact, the occupied space is less, the weight is lighter, the transmission efficiency is higher, and the power density is higher compared with that of the traditional drive assembly.

Further, the number of teeth of the second sun gear and the third sun gear are the same.

Further, the second sun gear is arranged at one end of the first half shaft, which is close to the second half shaft, and the third sun gear is arranged at one end of the second half shaft, which is close to the first half shaft.

Further, the planet carrier assembly comprises a first side planet carrier, a second side planet carrier, a first planet wheel shaft and a second planet wheel shaft, the first side planet carrier is connected with the second side planet carrier through the first planet wheel shaft, the first planet wheel structure is sleeved on the first planet wheel shaft, and the third planet wheel is connected with the second side planet carrier in a rotating mode through the second planet wheel shaft.

Further, the first planetary gear structure comprises a first left planetary gear, the first left planetary gear is sleeved on the first planetary gear shaft, and the first left planetary gear is meshed with the first sun gear and the gear ring respectively.

Further, the first planetary gear structure comprises a first left planetary gear and a first right planetary gear, the first left planetary gear is fixedly connected with the first right planetary gear through a connecting shaft, the connecting shaft is sleeved on the first planetary gear shaft, the first left planetary gear is meshed with the first sun gear, the first right planetary gear is meshed with the gear ring, and the second planetary gear is sleeved on the connecting shaft or the first planetary gear shaft.

Further, one end of the planet carrier assembly is rotationally connected with the shell through a first bearing, and the other end of the planet carrier assembly is rotationally connected with the shell through a second bearing;

or/and, the second planetary gears are provided with at least three, and each second planetary gear is meshed with one third planetary gear through meshing with the third sun gear.

Further, the first left planetary gear and the first right planetary gear are respectively provided with at least three.

The utility model also provides an automobile transmission system comprising the motor drive assembly.

Since the technical improvements and technical effects of the automotive transmission system are the same as those of the motor drive assembly, the automotive transmission system will not be described in detail.

The utility model also provides an automobile comprising the automobile transmission system.

Since technical improvements and technical effects of the automobile are the same as those of the automobile transmission system, the automobile will not be described in detail.

Drawings

FIG. 1 is a schematic diagram of a motor drive assembly according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of a motor driving assembly according to an embodiment of the utility model.

Reference numerals illustrate:

1. a first half shaft; 2. a first sun gear; 3. a motor; 4. a first bearing; 5. a planet carrier assembly; 51. a first side carrier; 52. a second side carrier; 53. a first planetary axle; 54. a second planetary axle; 6. a first left planet wheel; 7. a second planet wheel; 8. a gear ring; 9. a first right planet wheel; 10. a third planet wheel; 11. a second bearing; 12. a third sun gear; 13. a second half shaft; 14. a second sun gear; 15. a housing.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Moreover, in the drawings, the X-axis represents the longitudinal direction, that is, the front-rear direction, and the positive direction of the X-axis represents the front, and the negative direction of the X-axis represents the rear; the Y-axis in the drawing represents the lateral direction, i.e., the left-right direction, and the positive direction of the Y-axis represents the left and the negative direction of the Y-axis represents the right.

It should also be noted that the foregoing X-axis and Y-axis representations are used only for the purpose of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

Referring to fig. 1-2, a motor driving assembly according to an embodiment of the present utility model is configured to drive a first half shaft 1 and a second half shaft 13, where the motor driving assembly includes a motor 3, a transmission mechanism and a housing 15, where the transmission mechanism includes a planet carrier assembly 5, a first sun gear 2, a first planet gear structure, a second planet gear 7, a third planet gear 10 and a ring gear 8, the first half shaft 1 is provided with a second sun gear 14, the second half shaft 13 is provided with a third sun gear 12, two ends of the planet carrier assembly 5 are rotationally connected with the housing 15, the ring gear 8 is fixedly connected in the housing 15, the first planet gear structure and the third planet gear 10 are respectively rotationally connected to the planet carrier assembly 5, the second planet gear 7 is sleeved on a wheel shaft of the first planet gear structure or rotationally connected to the planet carrier assembly 5, the first planet gear structure is meshed with the ring gear 8, the second planet gear 7 is meshed with the second sun gear 14, and the third planet gear 10 is respectively meshed with the second motor 7 and the third planet gear 12, and the first planet gear 2 is meshed with the first sun gear 2.

Note that, the two ends of the planet carrier assembly 5 are rotatably connected to the housing 15, that is, the left and right ends of the planet carrier assembly 5 are rotatably connected to the housing 15, and the "contact" connection relationship between the planet carrier assembly 5 and the housing 15 is not directly shown in fig. 1 or 2, but the housing 15 in fig. 1 and 2 is merely a schematic structure, and the shape thereof is not limited to that shown in the drawings. Referring to fig. 1 and 2, alternatively, one end of the planet carrier assembly 5 may be rotatably connected to the housing 15 through the first bearing 4, and the other end of the planet carrier assembly 5 may be rotatably connected to the housing 15 through the second bearing 11. The left and right ends of the planet carrier assembly 5 are supported on the housing 15 through the first bearing 4 and the second bearing 11, respectively, so that the rotation thereof is smooth.

In this embodiment, the first half shaft 1 may be a left half shaft of an automobile, the second half shaft 13 may be a right half shaft of the automobile, the motor 3 may be coaxially disposed on the first half shaft 1 and in driving connection with the first sun gear 2, the housing 15 provides a carrier for rotation of the planet carrier assembly 5 and fixation of the ring gear 8, when the motor 3 rotates, the first sun gear 2 is driven to rotate, then the first sun gear 2 drives the first planet gear structure to rotate, and because the ring gear 8 meshed with the first planet gear structure is fixed, the rotation of the first sun gear 2 not only drives the first planet gear structure to rotate, but also drives the first planet gear structure to revolve around the first sun gear 2, that is, drives the planet carrier assembly 5 to rotate relative to the housing 15, and because the second planet gear 7 is sleeved on a wheel shaft of the first planet gear structure or is rotationally connected to the planet carrier assembly 5, rotation of the planet carrier assembly 5 drives the second planet gear 7 to revolve around the first sun gear 2. Thus, the torque transmission path of the electric machine 3 to the first half shaft 1 is: the motor 3-the first sun gear 2-the first planetary gear structure-the planet carrier assembly 5-the second planetary gear 7-the second sun gear 14-the first half shaft 1; the path of the torque of the motor 3 to the second half shaft 13 is: the motor 3-the first sun gear 2-the first planetary gear structure-the planet carrier assembly 5-the second planetary gear 7-the third planetary gear 10-the third sun gear 12-the second half shaft 13, wherein when the automobile runs straight, the second planetary gear 7 and the third planetary gear 10 revolve around the first sun gear 2 only under the drive of the planet carrier assembly 5, and the second planetary gear 7 and the third planetary gear 10 cannot rotate, so that the rotation speed of the first half shaft 1 and the second half shaft 13 is the same when the automobile runs; when the automobile turns, the second planet wheel 7 and the third planet wheel 10 revolve and simultaneously rotate passively, so that the rotation speeds of the first half shaft 1 and the second half shaft 13 are different, and the functions of a traditional speed reducer and a traditional differential are realized. The transmission mechanism in the motor drive assembly integrates a speed reduction function and a differential function, a transmission shaft between a traditional speed reducer and a differential mechanism is abandoned, a half-shaft bevel gear and a planetary bevel gear which are arranged at right angles in the traditional differential mechanism are also eliminated, all gears in the motor drive assembly can be round gears with parallel axes, the structure is more compact, the occupied space is less, the weight is lighter, the transmission efficiency is higher, the power density is higher, the speed ratio range can be realized, the rotating speed range of the bearing motor 3 is large, and different design requirements can be met.

Of course, in other embodiments, the first axle 1 may be a right axle and the second axle 13 may be a left axle.

It should be noted that, in order to achieve the speed reducing function, the differential gear is to achieve the speed reducing function, except for two bevel gears between the two bevel gears, which are provided with a transmission shaft and two ends of the transmission shaft, the conventional speed reducer is provided with at least one shell, one planet carrier assembly, one sun gear, one gear ring, a plurality of planet gears and the like, the conventional differential gear is provided with at least one shell, one planet carrier assembly, one conical planet gear, one large ring bevel gear sleeved on a half shaft, two conical half shaft gears fixed on the half shaft and the like, and the conventional driving assembly achieves the speed reducing and torque increasing function and the speed reducing function during turning through the speed reducer, the transmission shaft and the differential gear with the structure, a large number of gears with different shapes are used, a large amount of space is occupied, and the transmission efficiency is yet to be agreed. The inventive improvements of the present utility model are at least: the speed reduction function and the differential function are integrated in the shell 15, circular gears are used completely, the number of gears is small, only one shell 15, one gear ring 8, one planet carrier assembly 5 and the like are used, all gear axes are parallel, except for the planet gears arranged on the planet carrier assembly 5, all other gears are arranged inside the planet carrier assembly 5, after the corresponding gears are meshed, the structure is compact, the space occupation is greatly reduced, in addition, the second sun gear 14 on the first half shaft 1 is directly meshed with the second planet gears 7, the third sun gear 12 on the second half shaft 13 is indirectly meshed with the second planet gears 7 through the third planet gears 10, the second planet gears 7 and the third planet gears 10 are not rotated when the automobile runs in a straight line, the motor driving assembly only has the speed reduction and torque increasing function, and simultaneously, the second planet gears 7 and the third planet gears 10 can rotate when the automobile runs in a turning, and the motor driving assembly also has the speed reduction torque increasing function and the differential function.

In addition, the motor driving assembly can lubricate all gears simultaneously because the speed reducing function and the differential function are integrated together, and the lubricating oil does not need to be divided into two paths to lubricate the speed reducer and the differential mechanism respectively like a traditional automobile, so that the consumption of the lubricating oil is reduced, and the length of a lubricating oil pipeline and the occupied space of the pipeline are also reduced; moreover, the planetary gears of the conventional differential are not only in the housing of the differential, but even inside the planet carrier, the lubrication oil is not easy to enter for lubrication of the gears, whereas the second planetary gears 7 and the third planetary gears 10 of the present embodiment may be at least partially exposed to the outside of the planet carrier assembly 5, facilitating contact with the lubrication oil.

The motor drive assembly may be disposed either in the front or rear axle of the vehicle.

Alternatively, the second sun gear 14 and the third sun gear 12 have the same number of teeth.

In this embodiment, since the rotation speed of the second sun gear 14 indicates the rotation speed of the first half shaft 1, and the rotation speed of the third sun gear 12 indicates the rotation speed of the second half shaft 13, when the automobile travels straight, in order to ensure that the rotation speed of the first half shaft 1 is the same as the rotation speed of the second half shaft 13, the number of teeth of the second sun gear 14 and the third sun gear 12 is the same.

Although the number of teeth of the second sun gear 14 and the third sun gear 12 are the same, the diameters are different, and the diameter of the third sun gear 12 is smaller than the diameter of the second sun gear 14, so that the third planetary gear 10 can be disposed between the third sun gear 12 and the second planetary gear 7.

Referring to fig. 1, optionally, the second sun gear 14 is disposed at an end of the first half shaft 1 near the second half shaft 13, and the third sun gear 12 is disposed at an end of the second half shaft 13 near the first half shaft 1.

In this embodiment, the second sun gear 14 is disposed at the right end of the first half shaft 1, and the third sun gear 12 is disposed at the left end of the second half shaft 13, that is, the second sun gear 14 and the third sun gear 12 are as close as possible to reduce the axial length of the entire motor drive assembly.

Referring to fig. 1 and 2, optionally, the planet carrier assembly 5 includes a first side planet carrier 51, a second side planet carrier 52, a first planet axle 53, and a second planet axle 54, where the first side planet carrier 51 is connected to the second side planet carrier 52 through the first planet axle 53, the first planet structure is sleeved on the first planet axle 53, and the third planet 10 is rotatably connected to the second side planet carrier 52 through the second planet axle 54.

In this embodiment, the first side carrier 51, the second side carrier 52, the first planetary shaft 53, and the second planetary shaft 54 together constitute the carrier assembly 5. The first planet axle 53 may be press fit into the first side planet carrier 51 and the second side planet carrier 52 at both ends, the first planet structure being in particular a sleeve-connected to the first planet axle 53 in the planet carrier assembly 5, and the third planet 10 being in rotational connection with the second side planet carrier 52 via the second planet axle 54.

The left and right ends of the planet carrier assembly 5 are supported on the housing 15 through the first bearing 4 and the second bearing 11, respectively, so that the rotation of the planet carrier assembly is smooth. Specifically, a first side carrier 51 of the carrier assembly 5 is supported on the housing 15 by the first bearing 4, and a second side carrier 52 of the carrier assembly 5 is supported on the housing 15 by the second bearing 11.

Referring to fig. 1, optionally, the first planetary gear structure includes a first left planetary gear 6, the first left planetary gear 6 is sleeved on the first planetary gear shaft 53, and the first left planetary gear 6 is meshed with the first sun gear 2 and the ring gear 8, respectively.

In this embodiment, the first planetary gear structure includes only the first left planetary gear 6, and the first left planetary gear 6 meshes with the first sun gear 2 and also meshes with the ring gear 8 (as shown in fig. 1). Thus, the torque transmission path of the electric machine 3 to the first half shaft 1 is: the motor 3-the first sun gear 2-the first left planet wheel 6-the planet carrier assembly 5-the second planet wheel 7-the second sun gear 14-the first half shaft 1; the path of the torque of the motor 3 to the second half shaft 13 is: the motor 3-the first sun gear 2-the first left planet wheel 6-the planet carrier assembly 5-the second planet wheel 7-the third planet wheel 10-the third sun gear 12-the second half shaft 13.

In this embodiment, the first left planetary gear 6 may be a gear shaft (not shown in the drawing), the gear shaft of which is sleeved on the first planetary gear shaft 53, the second planetary gear 7 may be sleeved on the gear shaft of which (that is, the second planetary gear 7 is sleeved on the gear shaft of the first planetary gear structure as described above), and the second planetary gear 7 may be located on the left side or the right side of the gear ring portion of the gear shaft; of course, the second planet wheel 7 may also be directly sleeved on the first planet wheel shaft 53.

Referring to fig. 2, preferably, the first planetary gear structure includes a first left planetary gear 6 and a first right planetary gear 9, the first left planetary gear 6 is fixedly connected with the first right planetary gear 9 through a connecting shaft, the connecting shaft is sleeved on the first planetary gear shaft 53, the first left planetary gear 6 is meshed with the first sun gear 2, the first right planetary gear 9 is meshed with the gear ring 8, and the second planetary gear 7 is sleeved on the connecting shaft (that is, the second planetary gear 7 is sleeved on the gear shaft of the first planetary gear structure); alternatively, the second planet wheel 7 is sleeved on the first planet wheel shaft 53.

In this embodiment, the first planetary gear structure includes not only the first left planetary gear 6 but also the first right planetary gear 9, in which case, the first left planetary gear 6 is not meshed with the ring gear 8, but the first right planetary gear 9 is meshed with the ring gear 8, and the first right planetary gear 9 is fixedly connected with the first left planetary gear 6 through a hollow connecting shaft (not shown in the drawing), and the connecting shaft is rotationally connected to the planet carrier assembly 5 (that is, the connecting shaft is sleeved on the first planetary gear shaft 53). Thus, the torque transmission path of the electric machine 3 to the first half shaft 1 is: the motor 3-the first sun gear 2-the first left planetary gear 6-the first right planetary gear 9-the planetary carrier assembly 5-the second planetary gear 7-the second sun gear 14-the first half shaft 1; the path of the torque of the motor 3 to the second half shaft 13 is: the motor 3-the first sun gear 2-the first left planetary gear 6-the first right planetary gear 9-the planet carrier assembly 5-the second planetary gear 7-the third planetary gear 10-the third sun gear 12-the second half shaft 13. By adding the first right planet wheel 9, the motor drive assembly can be made to have a larger transmission ratio.

In this embodiment, since the second planet wheel 7 is sleeved on the connecting shaft between the first left planet wheel 6 and the first right planet wheel 9, the number of planet wheel shafts of the second planet wheel 7 can be reduced, the cost and the weight can be reduced, the planet carrier assembly 5 can be shared, and the axial length and the weight can be reduced. Wherein the first left planetary gear 6 may be a common circular gear, the first right planetary gear 9 may be a gear shaft (not shown in the figure), the second planetary gear 7 and the first left planetary gear 6 may be sequentially sleeved on the gear shaft of the gear shaft, and then the gear shaft of the gear shaft is sleeved on the first planetary gear shaft 53, where the second planetary gear 7 is located between the first left planetary gear 6 and the gear ring of the gear shaft; alternatively, the first left planetary gear 6 may be a common circular gear, the first right planetary gear 9 may be a gear shaft, the first left planetary gear 6 and the second planetary gear 7 are sequentially sleeved on the gear shaft of the gear shaft, and then the gear shaft of the gear shaft is sleeved on the first planetary gear shaft 53, where the second planetary gear 7 is located at a side of the first left planetary gear 6 far from the gear ring of the gear shaft; alternatively, the first right planet wheel 9 may be a common circular gear, the first left planet wheel 6 may be a gear shaft (not shown in the figure), the second planet wheel 7 and the first right planet wheel 9 may be sequentially sleeved on the gear shaft of the gear shaft, and then the gear shaft of the gear shaft is sleeved on the first planet wheel shaft 53, where the second planet wheel 7 is located between the first right planet wheel 9 and the gear ring of the gear shaft; alternatively, the first right planetary gear 9 may be a common circular gear, the first left planetary gear 6 may be a gear shaft, the first right planetary gear 9 and the second planetary gear 7 are sequentially sleeved on the gear shaft of the gear shaft, and then the gear shaft of the gear shaft is sleeved on the first planetary gear shaft 53, where the second planetary gear 7 is located on a side of the first right planetary gear 9 away from the gear ring of the gear shaft. Of course, the second planetary gear 7 may be directly sleeved on the first planetary gear shaft 53 instead of being sleeved on the connecting shaft, and may be located on the left side of the first left planetary gear 6 or on the right side of the first right planetary gear 9.

Referring to fig. 2, optionally, the first left planet 6 and the first right planet 9 are each provided with at least three.

In this embodiment, the first left planetary gears 6 are provided with at least three, the first right planetary gears 9 are also provided with at least three, so that the transmission from the motor 3 to the planet carrier assembly 5 can be ensured to be more stable, the axial positions of each first left planetary gear 6 relative to the planet carrier assembly 5 are the same, the axial positions of each first right planetary gear 9 relative to the planet carrier assembly 5 are the same, and the space occupation of the motor driving assembly cannot be increased.

Referring to fig. 2, optionally, the second planetary gears 7 are provided with at least three, and each of the second planetary gears 7 meshes with one of the third planetary gears 10 with the third sun gear 12.

In this embodiment, the second planetary gears 7 are provided with at least three, and each second planetary gear 7 is meshed with the third sun gear 12 through one third planetary gear 10, so that the transmission from the planet carrier assembly 5 to the second sun gear 14 and the third sun gear 12 can be ensured to be more stable, the axial positions of each second planetary gear 7 on the planet carrier assembly 5 are the same, the axial positions of each third planetary gear 10 on the planet carrier assembly 5 are the same, and the space occupation of the motor driving assembly can not be increased.

Illustratively, for example, the numbers of teeth of the first sun gear 2, the first left planetary gear 6, the first right planetary gear 9, the ring gear 8, the second planetary gear 7, the second sun gear 14, the third planetary gear 10, and the third sun gear 12 are 29, 62, 19, 80, 23, 25, 23, and 25, respectively, and the rotational speeds of the second sun gear 14 and the third sun gear 12 are N/10.002 when the motor 3 is N and the vehicle travels straight. When the automobile turns leftwards and runs, assuming that the difference rate is 50%, the rotating speed of the second sun gear 14 is N/20.004, and the rotating speed of the third sun gear 12 is 3N/20.004; similarly, when the vehicle is turning right, assuming that the differential speed is 50%, the rotational speed of the third sun gear 12 is N/20.004 and the rotational speed of the second sun gear 14 is 3N/20.004.

Another embodiment of the present utility model is an automotive driveline comprising a motor drive assembly as previously described.

Since the technical improvements and technical effects of the automotive transmission system are the same as those of the motor drive assembly, the automotive transmission system will not be described in detail.

An automobile in accordance with yet another embodiment of the present utility model includes an automobile driveline as described above.

Since technical improvements and technical effects of the automobile are the same as those of the automobile transmission system, the automobile will not be described in detail.

The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" and "a second" may explicitly or implicitly include at least one such feature.

Although the utility model is disclosed above, the scope of the utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the scope of the utility model.

Claims (10)

1. The motor drive assembly is used for driving a first half shaft (1) and a second half shaft (13), and is characterized by comprising a motor (3), a transmission mechanism and a shell (15), wherein the transmission mechanism comprises a planet carrier assembly (5), a first sun gear (2), a first planet gear structure, a second planet gear (7), a third planet gear (10) and a gear ring (8), the first half shaft (1) is provided with a second sun gear (14), the second half shaft (13) is provided with a third sun gear (12), two ends of the planet carrier assembly (5) are rotationally connected with the shell (15), the gear ring (8) is fixedly connected in the shell (15), the first planet gear structure and the third planet gear (10) are respectively rotationally connected with the planet carrier assembly (5), the second planet gear (7) is sleeved on a wheel shaft of the first planet gear structure or rotationally connected with the planet carrier assembly (5), the first planet gear structure is meshed with the gear ring (8), the second planet gear (7) is rotationally connected with the first planet gear (10) and the first planet gear (2) are respectively meshed with the first planet gear (12), and the first sun wheel (2) is meshed with the first planetary gear structure.

2. The motor drive assembly of claim 1, wherein the second sun gear (14) and the third sun gear (12) have the same number of teeth.

3. Motor drive assembly according to claim 1, characterized in that the second sun gear (14) is arranged at the end of the first half shaft (1) close to the second half shaft (13), and the third sun gear (12) is arranged at the end of the second half shaft (13) close to the first half shaft (1).

4. The motor drive assembly according to claim 1, wherein the planet carrier assembly (5) comprises a first side planet carrier (51), a second side planet carrier (52), a first planet axle (53) and a second planet axle (54), the first side planet carrier (51) and the second side planet carrier (52) are connected by the first planet axle (53), the first planet structure is sleeved on the first planet axle (53), and the third planet (10) is rotatably connected with the second side planet carrier (52) by the second planet axle (54).

5. The motor drive assembly according to claim 4, characterized in that the first planetary arrangement comprises a first left planetary wheel (6), the first left planetary wheel (6) being arranged around the first planetary wheel shaft (53), the first left planetary wheel (6) being in mesh with the first sun wheel (2) and the ring gear (8), respectively.

6. The motor drive assembly according to claim 4, characterized in that the first planetary gear structure comprises a first left planetary gear (6) and a first right planetary gear (9), the first left planetary gear (6) and the first right planetary gear (9) are fixedly connected through a connecting shaft, the connecting shaft is sleeved on the first planetary gear shaft (53), the first left planetary gear (6) is meshed with the first sun gear (2), the first right planetary gear (9) is meshed with the gear ring (8), and the second planetary gear (7) is sleeved on the connecting shaft or the first planetary gear shaft (53).

7. Motor drive assembly according to claim 6, characterized in that the first left planet wheel (6) and the first right planet wheel (9) are each provided with at least three.

8. Motor drive assembly according to claim 1, characterized in that one end of the planet carrier assembly (5) is rotatably connected to the housing (15) by means of a first bearing (4), and the other end of the planet carrier assembly (5) is rotatably connected to the housing (15) by means of a second bearing (11);

or/and, the second planetary gears (7) are provided with at least three, and each second planetary gear (7) is meshed with one third planetary gear (10) through meshing between the third sun gear (12).

9. An automotive transmission system comprising the motor drive assembly of any one of claims 1-8.

10. An automobile comprising the automobile transmission system according to claim 9.