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

A kind of 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 technique

With the development of the new energy vehicle industry, electric vehicles have become a development trend. The current drive assembly of an electric vehicle usually includes a motor, a transmission, and a differential. After the output torque and speed of the motor are changed through the transmission, they are transmitted to the left half shaft and the right half shaft by the transmission shaft and the differential in turn. Under the action of the differential gear, when the car is running straight, the speed of the left half shaft and the right half shaft are the same. The inner wheels ensure driving safety and quality. In the existing drive assembly, the transmission is usually designed with a parallel shaft layout, and a bevel gear differential is used for power output. The transmission is connected to the differential through a transmission shaft. The transmission and the differential are independent structures. The drive assembly occupies a large volume and is heavy, which is not conducive to the lightweight development of electric vehicles.

Utility model content

The utility model aims to solve the problems that the existing drive assembly occupies a large volume and is heavy.

In order to solve the above problems, the utility model provides a motor drive assembly for driving the first half shaft and the second half shaft, the motor drive assembly includes a motor, a transmission mechanism and a housing, and the transmission mechanism includes a planet carrier assembly Composition, the first sun gear, the first planetary gear structure, the second planetary gear, the third planetary gear and the ring gear, the second sun gear is set on the first half shaft, and the second sun gear is set on the second half shaft Three sun gears, the two ends of the planet carrier assembly are rotatably connected to the housing, the ring gear is fixedly connected in the housing, the first planetary gear structure and the third planetary gear are respectively rotatably connected to the housing On the planet carrier assembly, the second planetary gear is sleeved on the axle of the first planetary gear structure or is rotatably connected to the planetary carrier assembly, and the first planetary gear structure meshes with the ring gear , the second planetary gear is engaged with the second sun gear, the third planetary gear is respectively engaged with the second planetary gear and the third sun gear, and the motor is drivingly connected with the first sun gear, And the first sun gear meshes with the first planetary gear structure.

Compared with the prior art, the motor drive assembly provided by the utility model has but not limited to the following technical effects:

The first half shaft can be the left half shaft of the car, the second half shaft can be the right half shaft of the car, the motor can be coaxially arranged on the first half shaft and connected with the first sun gear drive, and the housing is the planet carrier assembly. The completed rotation and the fixation of the ring gear provide a carrier. When the motor rotates, it will drive the first sun gear to rotate, and then the first sun gear will drive the first planetary gear structure to rotate, because the ring gear meshing with the first planetary gear structure is fixed Yes, then, the rotation of the first sun gear will not only drive the rotation of the first planetary gear structure, but also drive the first planetary gear structure to revolve around the first sun gear, that is, to drive the planetary carrier assembly to rotate relative to the housing. The wheel sleeve is mounted on the wheel shaft of the first planetary gear structure or is rotatably connected to the planetary carrier assembly, and the rotation of the planetary carrier assembly will drive the second planetary wheel to revolve around the first sun gear. In this way, the torque transmission path from the motor to the first half shaft is: motor-first sun gear-first planetary gear structure-planet carrier assembly-second planetary gear-second sun gear-first half shaft; The torque path of the second axle shaft is: motor-first sun gear-first planetary gear structure-planet carrier assembly-second planetary gear-third planetary gear-third sun gear-second half-shaft, wherein, when When the car is running in a straight line, the second planetary wheel and the third planetary wheel are only driven by the planetary carrier assembly to revolve around the first sun wheel, and the second planetary wheel and the third planetary wheel will not rotate, so that when the car is running The first half shaft and the second half shaft rotate at the same speed; and when the car is turning, the second planetary wheel and the third planetary wheel will rotate passively while the second planetary wheel and the third planetary wheel are revolving, thereby realizing the rotation of the first half shaft and the second half shaft. The speed of the motor is different, and the functions of the traditional reducer and differential are realized. The transmission mechanism in the motor drive assembly of the utility model integrates the deceleration function and the differential speed function, abandons the transmission shaft between the traditional speed reducer and the differential, and also cancels the half shaft arranged at right angles in the traditional differential. Axial bevel gears and planetary bevel gears, all the gears in the motor drive assembly can be circular gears arranged in parallel to the axis, the structure is more compact, and compared with the traditional drive assembly, it has fewer parts, occupies less space, and weighs less Lighter, with higher transmission efficiency and higher power density.

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

Further, the planet carrier assembly includes a first side planet carrier, a second side planet carrier, a first planet wheel shaft and a second planet wheel shaft, and the first side planet carrier and the second side planet carrier pass through the The first planetary wheel shaft is connected, the first planetary wheel structure is sleeved on the first planetary wheel shaft, and the third planetary wheel is rotatably connected to the second side planetary carrier through the second planetary wheel shaft.

Further, the first planetary gear structure includes 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 connected to the first sun gear respectively. Mesh with the ring gear.

Further, the first planetary gear structure includes a first left planetary gear and a first right planetary gear, the first left planetary gear and the first right planetary gear are fixedly connected through a connecting shaft, and the connecting shaft is sleeved On the first planetary gear shaft, the first left planetary gear meshes with the first sun gear, the first right planetary gear meshes with the ring gear, and the second planetary gear is sleeved on the Connecting shaft or the first planetary shaft.

Further, one end of the planet carrier assembly is rotatably connected to the housing through a first bearing, and the other end of the planet carrier assembly is rotatably connected to the housing through a second bearing;

Or/and, there are at least three second planetary gears, each meshing between the second planetary gear and the third sun gear meshes with one third planetary gear.

Further, there are at least three first left planetary gears and first right planetary gears respectively.

The utility model also provides an automobile transmission system, which includes the aforementioned motor drive assembly.

Since the technical improvement and technical effect of the automobile transmission system are the same as those of the motor drive assembly, the description of the automobile transmission system will not be repeated.

The utility model also provides an automobile, including the automobile transmission system as mentioned above.

Since the technical improvement and technical effect of the automobile are the same as those of the automobile transmission system, the description of the automobile will not be repeated.

Description of drawings

Fig. 1 is a structural schematic diagram 1 of a motor drive assembly according to an embodiment of the present invention;

Fig. 2 is the second structural schematic diagram of the motor drive assembly according to the embodiment of the present invention.

Explanation of reference signs:

1. First half shaft; 2. First sun gear; 3. Motor; 4. First bearing; 5. Planetary carrier assembly; 51. First side planetary carrier; 52. Second side planetary carrier; 53. Second side planetary carrier 1 planetary wheel shaft; 54, the second planetary wheel shaft; 6, the first left planetary wheel; 7, the second planetary wheel; 8, the ring gear; 9, the first right planetary wheel; 10, the third planetary wheel; 11, the second Bearing; 12, the third sun gear; 13, the second half shaft; 14, the second sun gear; 15, the housing.

Detailed ways

In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, specific embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings.

In the description of the present utility model, it should be understood that the orientations or positional relationships indicated by the terms "left", "right", "front", "rear" etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Moreover, the X-axis in the accompanying drawings represents the longitudinal direction, that is, the front-to-back 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 represents the horizontal direction in the accompanying drawings, that is, the left-right direction, and the positive direction of the Y-axis The direction of the Y axis represents the left, and the negative direction of the Y axis represents the right.

At the same time, it should be noted that the meanings of the aforementioned X-axis and Y-axis are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation , so it cannot be interpreted as a limitation of the present utility model.

Referring to Fig. 1-2, a motor drive assembly according to an embodiment of the utility model is used to drive the first half shaft 1 and the second half shaft 13. The motor drive assembly includes a motor 3, a transmission mechanism and a housing 15. The transmission mechanism includes a planetary carrier assembly 5, a first sun gear 2, a first planetary gear structure, a second planetary gear 7, a third planetary gear 10 and a ring gear 8. The first half shaft 1 is provided with a second The sun gear 14, the third sun gear 12 is arranged on the second half shaft 13, the two ends of the planet carrier assembly 5 are rotatably connected to the housing 15, and the ring gear 8 is fixedly connected to the housing In the body 15, the first planetary gear structure and the third planetary gear 10 are respectively rotatably connected to the planetary carrier assembly 5, and the second planetary gear 7 is sleeved on the axle of the first planetary gear structure or rotationally connected to the planet carrier assembly 5, the first planetary gear structure meshes with the ring gear 8, the second planetary gear 7 meshes with the second sun gear 14, and the third planetary gear 10 are respectively meshed with the second planetary gear 7 and the third sun gear 12, the motor 3 is drivingly connected with the first sun gear 2, and the first sun gear 2 is connected with the first planetary gear Structural engagement.

Among them, it should be noted that the two ends of the planetary carrier assembly 5 are rotatably connected with the housing 15, which means that the left and right ends of the planetary carrier assembly 5 are rotatably connected with the housing 15, although from Fig. 1 or Fig. 2, there is no It directly shows the "contact" connection relationship between the planetary carrier assembly 5 and the housing 15, however, the housing 15 in Figures 1 and 2 is only a schematic structure, and its shape is not limited to what is shown in the figure. 1 and 2, optionally, one end of the planet carrier assembly 5 can be rotatably connected to the housing 15 through the first bearing 4, and the other end of the planet carrier assembly 5 can be connected through the second bearing 11 is rotatably connected with the housing 15 . The left and right ends of the planet carrier assembly 5 are respectively supported on the housing 15 through the first bearing 4 and the second bearing 11 to make it rotate smoothly.

In this embodiment, the first half shaft 1 can be the left half shaft of the car, the second half shaft 13 is the right half shaft of the car, and the motor 3 can be coaxially arranged on the first half shaft 1 and connected with the first sun gear 2 drive connection, the housing 15 provides a carrier for the rotation of the planet carrier assembly 5 and the fixing of the ring gear 8, when the motor 3 rotates, it drives the first sun gear 2 to rotate, and then the first sun gear 2 drives the first planetary gear The structure rotates. Since the ring gear 8 meshing with the first planetary gear structure is fixed, the rotation of the first sun gear 2 will not only drive the first planetary gear structure to rotate, but also drive the first planetary gear structure to rotate around the first sun gear structure. The wheel 2 revolves, that is, the planetary carrier assembly 5 is driven to rotate relative to the housing 15. Since the second planetary gear 7 is sleeved on the wheel shaft of the first planetary gear structure or is rotatably connected to the planetary carrier assembly 5, the planetary carrier assembly The rotation of 5 will drive the second planetary gear 7 to revolve around the first sun gear 2. In this way, the torque transmission path from the motor 3 to the first half shaft 1 is: motor 3-first sun gear 2-first planetary gear structure-planet carrier assembly 5-second planetary gear 7-second sun gear 14-the first Half shaft 1; the path of torque from motor 3 to second half shaft 13 is: motor 3-first sun gear 2-first planetary gear structure-planet carrier assembly 5-second planetary gear 7-third planetary gear 10-the third sun gear 12-the second half shaft 13, wherein, when the car is running straight, the second planetary gear 7 and the third planetary gear 10 are only driven by the planetary carrier assembly 5 around the first sun gear 2 revolution, the second planetary wheel 7 and the third planetary wheel 10 will not rotate, so that the first half-shaft 1 and the second half-shaft 13 rotate at the same speed when the car is running; and when the car is turning, the second planetary wheel 7 and the third While the third planetary gear 10 is revolving, it also passively rotates, so that the rotational speeds of the first half-shaft 1 and the second half-shaft 13 are different, and the functions of the traditional reducer and differential are realized. The transmission mechanism in the motor drive assembly of the utility model integrates the deceleration function and the differential speed function, abandons the transmission shaft between the traditional speed reducer and the differential, and also cancels the half shaft arranged at right angles in the traditional differential. Axial bevel gears and planetary bevel gears, all the gears in the motor drive assembly can be circular gears arranged in parallel to the axis, the structure is more compact, and compared with the traditional drive assembly, it has fewer parts, occupies less space, and weighs less Lightweight, higher transmission efficiency, higher power density, a wide range of speed ratios, and a wide range of motor speeds, which can meet different design requirements.

Of course, in other embodiments, the first semi-axis 1 may also be the right semi-axis, and the second semi-axis 13 may be the left semi-axis.

It should be noted that in order to achieve the deceleration function of the traditional reducer and the differential function of the differential, in addition to the transmission shaft between the two and the two bevel gears at both ends of the transmission shaft, the traditional reducer has at least one Housing, a planetary carrier assembly, a sun gear, a ring gear, multiple planetary gears, etc., the traditional differential has at least one housing, a planetary carrier assembly, a conical planetary gear, a set in half The large annular bevel gear on the shaft, two conical side gears fixed on the half shaft, etc., the traditional drive assembly realizes the function of deceleration, torque increase and turning through the reducer, transmission shaft and differential of the above structure. When the differential function is used, a large number of gears with different shapes are used, which takes up a lot of space, and the transmission efficiency is also open to question. And the inventive improvement of the present utility model at least lies in: integrate deceleration function and differential speed function in a housing 15, all use circular gear, and the amount of gear quantity is less, only use a housing 15, a ring gear 8, A planetary carrier assembly 5, etc., all gear axes are parallel, except for the planetary gear set on the planetary carrier assembly 5, all other gears are set inside the planetary carrier assembly 5, after the corresponding gears mesh , the structure is compact, which greatly reduces the space occupied, and the second sun gear 14 on the first half shaft 1 directly meshes with the second planetary gear 7, while the third sun gear 12 on the second half shaft 13 passes through The third planetary wheel 10 is indirectly meshed with the second planetary wheel 7 to ensure that the second planetary wheel 7 and the third planetary wheel 10 will not rotate when the car is running straight. It is ensured that the second planetary wheel 7 and the third planetary wheel 10 will rotate when the car is turning, so that the motor drive assembly has the function of deceleration, torque increase and differential speed at the same time.

In addition, the motor drive assembly can lubricate all gears at the same time because the deceleration function and the differential function are integrated together. The lubricating oil does not need to be lubricated in two ways to lubricate the reducer and differential separately like traditional cars, reducing the need for lubrication. The amount of oil used also reduces the length of the lubricating oil pipeline and the space occupied by the pipeline; moreover, the planetary gear of the traditional differential is not only in the differential housing, but also inside the planetary carrier, so the lubricating oil is not easy to enter. The gears are lubricated, and the second planetary gear 7 and the third planetary gear 10 of this embodiment can be at least partially exposed outside the planetary carrier assembly 5 to facilitate contact with lubricating oil.

It should be noted that the vehicle with the motor drive assembly can be either a front drive vehicle or a rear drive vehicle, that is, the motor drive assembly can be arranged at the front axle or at the rear axle .

Optionally, the number of teeth of the second sun gear 14 and the third sun gear 12 are the same.

In this embodiment, since the rotational speed of the second sun gear 14 represents the rotational speed of the first semi-axis 1, and the rotational speed of the third sun gear 12 represents the rotational speed of the second semi-axis 13, when the automobile is running straight, in order to ensure The rotational speed of the first half shaft 1 is the same as that of the second half shaft 13 , so the number of teeth of the second sun gear 14 and the third sun gear 12 must be the same.

It should be noted that 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 sun gear 12 The third planetary gear 10 can only be arranged between the second planetary gear 7 .

Referring to FIG. 1 , optionally, the second sun gear 14 is arranged on one end of the first half shaft 1 close to the second half shaft 13, and the third sun gear 12 is arranged on the second half shaft 13 is close to one end of the first semi-axis 1 .

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

1 and 2, optionally, the planetary carrier assembly 5 includes a first side planetary carrier 51, a second side planetary carrier 52, a first planetary shaft 53 and a second planetary shaft 54, the first side The planetary carrier 51 is connected to the second side planetary carrier 52 through the first planetary wheel shaft 53, the first planetary wheel structure is sleeved on the first planetary wheel shaft 53, and the third planetary wheel 10 is passed through the first planetary wheel shaft 53. The second planetary shaft 54 is rotatably connected to the second side planetary carrier 52 .

In this embodiment, the first planetary carrier 51 , the second planetary carrier 52 , the first planetary shaft 53 and the second planetary shaft 54 together form the planetary carrier assembly 5 . Both ends of the first planetary gear shaft 53 can be press-fitted into the first side planetary carrier 51 and the second side planetary carrier 52 , the first planetary gear structure is specifically the first planetary gear shaft 53 sleeved in the planetary carrier assembly 5 On the other hand, the third planetary gear 10 is rotationally connected with the second side planetary carrier 52 through the second planetary gear shaft 54 .

Wherein, the left and right ends of the planet carrier assembly 5 are respectively supported on the casing 15 through the first bearing 4 and the second bearing 11 to make it rotate smoothly. Specifically, the first side planet carrier 51 of the planet carrier assembly 5 is supported on the housing 15 through the first bearing 4 , and the second side planet carrier 52 of the planet carrier assembly 5 is supported on the housing 15 through 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 Mesh with the first sun gear 2 and the ring gear 8 respectively.

In this embodiment, the first planetary gear structure only includes 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 ). In this way, the torque transmission path from the motor 3 to the first half shaft 1 is: motor 3-first sun gear 2-first left planetary gear 6-planetary carrier assembly 5-second planetary gear 7-second sun gear 14- The first half shaft 1; the path of the torque from the motor 3 to the second half shaft 13 is: motor 3-first sun gear 2-first left planetary gear 6-planet carrier assembly 5-second planetary gear 7-third Planetary gear 10-third sun gear 12-second half shaft 13.

Wherein, in this embodiment, the first left planetary wheel 6 can be a gear shaft (not shown in the figure), the wheel shaft of the gear shaft is sleeved on the first planetary wheel shaft 53, and the second planetary wheel 7 can be sleeved on the On the wheel shaft of the gear shaft (that is, the second planetary gear 7 is sleeved on the wheel shaft of the first planetary gear structure as mentioned above), the second planetary gear 7 can be positioned at the left side of the ring gear part in the gear shaft or Right side; of course, the second planetary wheel 7 can also be directly sleeved on the first planetary 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, and the first left planetary gear 6 and the first right planetary gear 9 are fixed by a connecting shaft connected, the connecting shaft is sleeved on the first planetary shaft 53, the first left planetary gear 6 meshes with the first sun gear 2, the first right planetary gear 9 and the ring gear 8 Engagement, the second planetary gear 7 is sleeved on the connecting shaft (that is, the second planetary gear 7 is sleeved on the wheel shaft of the first planetary gear structure as mentioned above); or, the second planetary gear 7 is sleeved on the first planetary 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 this case, the first left planetary gear 6 does not mesh with the ring gear 8, but the first The right planetary wheel 9 meshes with the ring gear 8, and the first right planetary wheel 9 is fixedly connected to the first left planetary wheel 6 through a hollow connection shaft (not shown in the figure), and the connection shaft is connected to the planet carrier assembly 5 in rotation (also That is to say, the connecting shaft is sleeved on the first planetary wheel shaft 53). In this way, the torque transmission path from the motor 3 to the first half shaft 1 is: motor 3-first sun gear 2-first left planetary gear 6-first right planetary gear 9-planetary carrier assembly 5-second planetary gear 7 - second sun gear 14 - first half shaft 1; the path of torque from motor 3 to second half shaft 13 is: motor 3 - first sun gear 2 - first left planetary gear 6 - first right planetary gear 9 - Planet carrier assembly 5-second planetary gear 7-third planetary gear 10-third sun gear 12-second half shaft 13. By adding the first right planetary gear 9, the motor drive assembly can have a larger speed ratio.

In this embodiment, since the second planetary wheel 7 is set on the connecting shaft between the first left planetary wheel 6 and the first right planetary wheel 9, the number of planetary wheel shafts of the second planetary wheel 7 itself can be reduced, and the cost and reduction can be reduced. Heavy, share the planet carrier assembly 5, reduce the axial length and weight. Wherein, the first left planetary wheel 6 can be a common circular gear, and the first right planetary wheel 9 can be a gear shaft (not shown in the figure), and the second planetary wheel 7 and the first left planetary wheel 6 can be set in turn Connected to the wheel shaft of the gear shaft, and then the wheel shaft of the gear shaft is sleeved on the first planetary wheel shaft 53. At this time, the second planetary gear 7 is located between the first left planetary wheel 6 and the ring gear of the gear shaft Or, the first left planetary wheel 6 can be a common circular gear, and the first right planetary wheel 9 can be a gear shaft, and the first left planetary wheel 6 and the second planetary wheel 7 are sleeved on the gear shaft successively on the wheel shaft, and then the wheel shaft of the gear shaft is sleeved on the first planetary wheel shaft 53. At this time, the second planetary gear 7 is located at the side of the ring gear of the first left planetary wheel 6 away from the gear shaft; or, the second A right planetary wheel 9 can be a common circular gear, and the first left planetary wheel 6 can be a gear shaft (not shown in the figure), and the second planetary wheel 7 and the first right planetary wheel 9 can be socketed on the on the wheel shaft of the gear shaft, and then the wheel shaft of the gear shaft is sleeved on the first planetary wheel shaft 53, and now the second planetary wheel 7 is located between the first right planetary wheel 9 and the ring gear of the gear shaft; or, The first right planetary wheel 9 can be a common circular gear, the first left planetary wheel 6 can be a gear shaft, and the first right planetary wheel 9 and the second planetary wheel 7 are sequentially sleeved on the wheel shaft of the gear shaft, Then, the wheel shaft of the gear shaft is sleeved on the first planetary gear shaft 53. At this time, the second planetary gear 7 is located on the side of the first right planetary gear 9 away from the ring gear of the gear shaft. Certainly, the second planetary gear 7 may not be sleeved on the connecting shaft, but directly sleeved on the first planetary gear shaft 53, and 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. side.

Referring to FIG. 2 , optionally, at least three of the first left planetary gear 6 and the first right planetary gear 9 are respectively provided.

In this embodiment, there are at least three first left planetary wheels 6, and at least three first right planetary wheels 9, which can ensure that the transmission from the motor 3 to the planet carrier assembly 5 is more stable, and each first The axial position of the left planetary wheel 6 relative to the planetary carrier assembly 5 is the same, and the axial position of each first right planetary wheel 9 relative to the planetary carrier assembly 5 is also the same, which will not increase the space occupied by the motor drive assembly .

Referring to FIG. 2 , optionally, there are at least three second planetary gears 7 , each meshing between the second planetary gear 7 and the third sun gear 12 is engaged with one third planetary gear 10.

In this embodiment, there are at least three second planetary gears 7, and each second planetary gear 7 meshes with the third sun gear 12 through a third planetary gear 10, which can ensure that the planetary carrier assembly 5 reaches the second The transmission of the sun gear 14 and the third sun gear 12 is more stable, and the shaft position of each second planetary gear 7 on the planet carrier assembly 5 is the same, and the position of each third planet gear 10 on the planet carrier assembly 5 The same axial position does not increase the space occupation of the motor drive assembly.

Exemplarily, for example, 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, the third sun gear The number of teeth of the wheel 12 is respectively 29, 62, 19, 80, 23, 25, 23, 25, assuming that the rotating speed of the motor 3 is N, and when the automobile runs straight, the rotating speeds of the second sun gear 14 and the third sun gear 12 are N/ 10.002. When the automobile is turning left, when the speed difference 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 automobile is turning right, Assuming that the differential speed is 50%, the rotation speed of the third sun gear 12 is N/20.004, and the rotation speed of the second sun gear 14 is 3N/20.004.

An automobile transmission system according to another embodiment of the utility model includes the motor drive assembly as described above.

Since the technical improvement and technical effect of the automobile transmission system are the same as those of the motor drive assembly, the description of the automobile transmission system will not be repeated.

An automobile according to yet another embodiment of the utility model includes the automobile transmission system as described above.

Since the technical improvement and technical effect of the automobile are the same as those of the automobile transmission system, the description of the automobile will not be repeated.

The terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include at least one of these features.

Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, and these changes and modifications will all fall within the protection scope of the present 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.