CN116985626A - Motor drive assembly, automobile transmission system and automobile - Google Patents

Abstract

The invention provides a motor drive assembly, a vehicle transmission system and an automobile, and relates to the field of automotive technology. The motor drive assembly includes a motor, a planetary row structure and a differential structure. The motor is drivingly connected to the planetary row structure. The planet carrier is the output end of the planet row structure. The planet carrier includes a first planet wheel shaft and a second planet wheel shaft. The planet wheels in the planet row structure are sleeved on the first planet wheel shaft; the differential structure includes the first planet wheel and the second planet wheel shaft. wheel, a first sun gear and a second sun gear, the first sun gear is arranged on the first half shaft, the second sun gear is arranged on the second half shaft, the first planet gear is sleeved on the first planet gear shaft, and the second The planet gear is sleeved on the second planet gear shaft, the first planet gear meshes with the first sun gear, and the second planet gear meshes with the first planet gear and the second sun gear respectively. The motor drive assembly is highly integrated and lightweight.

Description

A motor drive assembly, automobile transmission system and automobile

Technical field

The present invention relates to the field of automobile technology, and specifically to a motor drive assembly, an automobile transmission system and an automobile.

Background technique

Nowadays, all walks of life are paying more and more attention to environmental protection and energy conservation, and the same is true for the automobile industry. Therefore, the production quantity and use quantity of traditional fuel vehicles are gradually decreasing, while the demand for electric vehicles is increasing day by day. The current drive assembly of electric vehicles usually includes a motor, a reducer and a differential. The motor provides the initial power output, and the reducer then decelerates the speed output by the motor. After the speed is reduced, it is distributed to the electric vehicle through the differential. The left half shaft and right half shaft ultimately drive the electric vehicle.

In some electric vehicles, in order to reduce the space occupied by the vehicle drive assembly and reduce the overall weight, the reducer is usually changed from a traditional parallel shaft reducer to a planetary row reducer. However, the differential speed The reducer and the planetary reducer are still independent structures, and they need to be connected through a transmission shaft arranged longitudinally along the car and bevel gears at both ends of the transmission shaft. As a result, the overall vehicle drive assembly still takes up a lot of space in the car and still weighs a lot. heavier. Moreover, in order to connect the differential to the reducer through the transmission shaft, the traditional differential is usually a bevel gear differential, which will further increase the space occupied by the car and further increase the weight, which is not conducive to the lightweight design of electric vehicles.

Contents of the invention

The invention aims to solve the problem of heavy weight of existing electric vehicles.

In order to solve the above problems, the present invention provides a motor drive assembly for driving the first half shaft and the second half shaft. The motor drive assembly includes a motor and a planetary row structure. The motor and the planetary row structure Driving connection, the planet carrier in the planet row structure is the output end of the planet row structure, the planet carrier includes a first planet wheel shaft, a second planet wheel shaft and two planet carrier bodies, the first planet wheel shaft and Both ends of the second planet wheel shaft are respectively installed on the two planet carrier bodies. The planet wheels in the planet row structure are sleeved on the first planet wheel shaft, and the planets in the planet row structure The wheels include coaxial and fixedly connected large-diameter gears and small-diameter gears;

The motor drive assembly also includes a differential structure. The differential structure includes a first planet gear, a second planet gear, a first sun gear and a second sun gear. The first sun gear is disposed on the first on one of the half shaft and the second half shaft, the second sun gear is disposed on the other of the first half shaft and the second half shaft, the first planet gear sleeve is provided on the first planet gear shaft, and the large diameter gear is located between the small diameter gear and the first planet gear, the second planet gear is sleeved on the second planet gear shaft, and The first planet gear meshes with the first sun gear, and the second planet gear meshes with the first planet gear and the second sun gear respectively.

Compared with the existing technology, the motor drive assembly provided by the present invention has but is not limited to the following technical effects:

The planetary row structure with deceleration function in the prior art can be integrated with the motor. The motor can be sleeved on the first half-shaft, and the planetary row structure connected to the motor drive can be sleeved on the first half-shaft and the second half-shaft. The position where the half shafts are close to each other, and the differential structure is integrated into the planetary row structure, thereby dividing the output torque of the planetary row structure to the first half shaft and the second half shaft. Through the above arrangement, eliminating the need for The longitudinal transmission shaft between the traditional bevel gear differential and the reducer and the bevel gears at both ends of the longitudinal transmission shaft are eliminated, reducing the overall weight and volume of the motor drive assembly, which is beneficial to reducing the weight of the vehicle.

In the motor drive assembly of the present invention, when a relatively mature planetary row structure in the field (usually including four parts, namely planetary gear, planetary carrier, ring gear and sun gear) is used, the planetary row structure is specifically used in the present invention. In the middle, the ring gear in the four parts of the planet row structure can be used as the fixed part, the remaining three parts can be used as the moving part, and the sun gear in the remaining three parts can be used as the input end to be set in the first The motor is connected on the half shaft, and then the planet carrier in the planetary row structure can be used as the output end, thereby realizing the deceleration and torque increase of the motor. Moreover, compared with the traditional deceleration that is completely independent in front or behind the two half shafts In terms of machines and motors, after the planetary row structure of the present invention that is sleeved on the near ends of the two half-shafts is connected to the motor that is sleeved on the first half-shaft, it occupies less space and is lighter in weight. ; In addition, since the planet gears in the planetary row structure include coaxial and fixedly connected large-diameter gears and small-diameter gears, and the number of teeth of the large-diameter gear is greater than the number of teeth of the small-diameter gear, the large-diameter gear can be connected to the sun in the planetary row structure. The gear meshing meshes the small-diameter gear with the ring ring in the planetary row structure, so that the planetary carrier of the planetary row structure can have a larger torque output and at the same time have a higher degree of integration.

When the differential structure of the present invention is integrated into the planet row structure, specifically, the first planet gear in the differential structure is sleeved on the first planet wheel shaft in the planet carrier in the planet row structure (the first planet wheel shaft Connect the planet carrier bodies on both sides together), and the second planet gear in the differential structure is connected to the planet carrier body through the second planet wheel shaft, and the first sun gear in the differential structure is disposed on, for example, the first half shaft, The second sun gear in the differential structure is arranged on the second half shaft. At the same time, the first sun gear meshes with the first planet gear, and the second planet gear meshes with the first planet gear and the second sun gear respectively. This is achieved The differential structure is no longer a traditional bevel gear differential, and after the differential structure is integrated with the planetary row structure, it is possible to further reduce the space occupied by the motor drive assembly in the car and further reduce the overall weight. It is beneficial to reduce the weight of the car; among them, when the car starts to drive, the planet carrier of the planet row structure serves as the output end, which means that the planet carrier will rotate around the two half-axes. If the car is running in a straight line, the differential structure will not play a role. Differential effect, that is, the first planet wheel and the second planet wheel in the differential structure do not rotate, but revolve driven by the rotating planet carrier, and finally transmit the torque to the first sun wheel and the second sun wheel, and The first sun gear and the second sun gear are driven to rotate at the same speed. If the car is turning, the first planet wheel and the second planet wheel in the differential structure will not only revolve, but also rotate, which will eventually cause the third planet wheel to rotate at the same speed. The speeds of the half shaft and the second rotating shaft are different (that is, the differential function is realized) to ensure normal driving of the car.

In addition, in the present invention, the large-diameter gear is located between the small-diameter gear and the first planet gear. That is to say, the large-diameter gear with larger size and heavier weight can be located in the middle of the first planet gear shaft. Or near the middle, while the smaller and lighter small-diameter gears and the first planetary gear can be located at either end of the first planetary gear shaft or near both ends, so that the first planetary gear shaft will not be affected by the If there are multiple gears in the sleeve and the force is uneven, it will help the first planet wheel shaft to be evenly stressed, improve its durability, reduce its deformation when it rotates with the planet carrier, and ensure that the planet wheel and sun wheel mesh. The misalignment is small, which is beneficial to improving the overall performance of the motor drive assembly.

Further, let the sun gear in the planet row structure be a third sun gear, the third sun gear is sleeved on the first half shaft, and the motor is drivingly connected to the third sun gear, The large-diameter gear meshes with the third sun gear, and the small-diameter gear meshes with the ring gear in the planet row structure.

Further, the first planet wheel shaft includes a large diameter part and a small diameter part that are coaxially connected. The planet gears in the planet row structure are sleeved on the small diameter part, and the first planet gears are sleeved on the large diameter part. diameter part.

Further, the first sun gear and the second sun gear have the same number of teeth.

Further, the motor drive assembly also includes a housing and a first bearing. The ring ring in the planet row structure is fixed on the housing. The two planet carrier bodies rotate through the first bearing respectively. connected to the housing.

Further, the motor drive assembly further includes a second bearing, so that the sun gear in the planet row structure is a third sun gear, and the third sun gear is sleeved on the first half shaft, and the The third sun gear is an axle structure. The axle structure includes a third wheel body and a third axle body that are fixedly connected. The third axle body is sleeved on the first half-shaft. The third wheel body is provided with At an end of the third shaft body close to the second half shaft, a rotor of the motor is disposed on the third shaft body, and the rotor is used to rotate synchronously with the third shaft body, and the The third shaft body is rotationally connected to the housing through the second bearing.

Further, the motor drive assembly further includes a third bearing, the second sun gear is disposed on one end of the first half shaft close to the second half shaft, and the other end of the first half shaft passes through The third bearing is rotationally connected to the housing;

And/or, the motor drive assembly further includes a fourth bearing, the first sun gear is disposed on an end of the second half shaft close to the first half shaft, and the second half shaft passes through the The fourth bearing is rotationally connected to the planet carrier body or the housing, and the fourth bearing abuts the first sun gear.

Further, the planet carrier further includes an intermediate support part, which is connected to the two planet carrier bodies respectively, wherein the intermediate support part is sleeved on the large diameter part and close to the small diameter part. one end.

The invention also provides an automobile transmission system, including the motor drive assembly as mentioned above.

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

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

Since the 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.

Description of drawings

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

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

Explanation of reference symbols:

11. First half shaft; 12. Second half shaft; 13. Motor; 131. Rotor; 14. Planet carrier; 141. Planet carrier body; 142. First planet wheel shaft; 1421. Large diameter part; 1422. Small diameter Part; 143. Second planetary gear shaft; 144. Middle support part; 15. Ring gear; 16. Third sun gear; 161. Third wheel body; 162. Third shaft body; 1621. First section shaft body; 1622 , the second section shaft body; 1623. the third section shaft body; 1624. the fourth section shaft body; 1625. the fifth section shaft body; 17. double gear; 171. large diameter gear; 172. small diameter gear; 18 , first planet gear; 19, second planet gear; 20, first sun gear; 21, second sun gear; 23, housing; 24, first bearing; 25, second bearing; 26, third bearing; 27. Fourth bearing; 28. Nut.

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of To facilitate the description of the present invention and to simplify the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

Moreover, the X-axis in the 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 The negative direction of the Y-axis represents the right.

At the same time, it should be noted that the aforementioned X-axis and Y-axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

Referring to Figure 1, a motor drive assembly according to an embodiment of the present invention is used to drive the first half shaft 11 and the second half shaft 12. The motor drive assembly includes a motor 13 and a planetary row structure. The motor 13 and The planet row structure is drivingly connected. The planet carrier 14 in the planet row structure is the output end of the planet row structure. The planet carrier 14 includes a first planet wheel shaft 142, a second planet wheel shaft 143 and two planet carriers. The main body 141, the two ends of the first planet wheel shaft 142 and the second planet wheel shaft 143 are respectively installed on the two planet carrier bodies 141, and the planet wheels in the planet row structure are sleeved on the first planet wheel shaft. 142, and the planet wheels in the planet row structure include coaxial and fixedly connected large-diameter gears 171 and small-diameter gears 172;

The motor drive assembly also includes a differential structure, which includes a first planet gear 18, a second planet gear 19, a first sun gear 20 and a second sun gear 21. The first sun gear 20 is provided On one of the first half shaft 11 and the second half shaft 12 , the second sun gear 21 is disposed on the other of the first half shaft 11 and the second half shaft 12 . In this case, the first planet gear 18 is sleeved on the first planet gear shaft 142 , and the large diameter gear 171 is located between the small diameter gear 172 and the first planet gear 18 . Two planet gears 19 are sleeved on the second planet gear shaft 143 , and the first planet gear 18 meshes with the first sun. The second planet gears 19 are respectively connected with the first planet gear 18 and the first planet gear 18 . The second sun gear 21 is engaged.

In this embodiment, the planetary row structure with deceleration function in the prior art can be integrated with the motor 13. The motor 13 can be sleeved on the first half shaft 11, and the planetary row structure drivingly connected to the motor 13 can be sleeved. It is connected to the position where the first half shaft 11 and the second half shaft 12 are close, and the differential structure is integrated in the planetary row structure, thereby dividing the output torque of the planetary row structure to the first half shaft 11 and the second half shaft 11. Half shaft 12, through the above arrangement, eliminates the longitudinal transmission shaft between the traditional bevel gear differential and the reducer and the bevel gears at both ends of the longitudinal transmission shaft, reducing the overall weight and volume of the motor drive assembly. , which is beneficial to reducing the weight of the car.

In the motor drive assembly of this embodiment, when a relatively mature planetary row structure in the field is used (usually including four parts, namely, planetary gear, planetary carrier 14, ring gear 15 and sun gear), the specific application of the planetary row structure is In this embodiment, the ring gear 15 in the four parts of the planet row structure can be used as a fixed part, the remaining three parts can be used as moving parts, and the sun gear in the remaining three parts can be used as an input end to communicate with The motor 13 sleeved on the first half shaft 11 is connected, and then the planet carrier 14 in the planet row structure can be used as the output end, thereby realizing the deceleration and torque increase of the motor 13. Moreover, compared with the traditional one, it is completely independent. For the reducers and motors 13 in front or behind the two half-shafts, the planetary row structure of this embodiment that is sleeved on the near ends of the two half-shafts is connected to the motor 13 that is sleeved on the first half-shaft 11 Finally, it occupies less space and is lighter in the car; in addition, because the planet wheels in the planet row structure include coaxial and fixedly connected large-diameter gears 171 and small-diameter gears 172, the number of teeth of the large-diameter gear 171 is greater than that of the small-diameter gears 171. The number of teeth of the gear 172 allows the large-diameter gear 171 to mesh with the sun gear in the planetary row structure, and the small-diameter gear 172 to mesh with the ring gear in the planetary row structure, thereby enabling the planet carrier 14 of the planetary row structure to have a larger Large torque output and a high degree of integration.

When the differential structure of this embodiment is integrated into the planet row structure, specifically, the first planet gear 18 in the differential structure is sleeved on the first planet gear shaft 142 in the planet carrier 14 in the planet row structure (the The first planet gear shaft 142 connects the planet carrier bodies 141 on both sides together), and the second planet gear 19 in the differential structure is connected to the planet carrier body 141 through the second planet gear shaft 143. The first sun gear in the differential structure 20 is disposed on, for example, the first half shaft 11, and the second sun gear 21 in the differential structure is disposed on the second half shaft 12. At the same time, the first sun gear 20 meshes with the first planet gear 18, and the second planet gear 20 is disposed on the first half shaft 11. 19 meshes with the first planetary gear 18 and the second sun gear 21 respectively, so that the differential structure is no longer a traditional bevel gear differential, and after the differential structure is integrated with the planetary row structure, further reduction can be achieved The motor drive assembly occupies the space of the car and further reduces the overall weight, which is beneficial to reducing the weight of the car. When the car starts driving, the planet carrier 14 of the planet row structure serves as the output end, which means that the planet carrier 14 will Rotating around two half axes, if the car is traveling in a straight line, the differential structure will not play a differential role, that is, the first planetary gear 18 and the second planetary gear 19 in the differential structure will not rotate, but are just rotating planets. The first sun gear 20 and the second sun gear 21 are driven by the frame 14 to rotate at the same speed. If the car is turning, The first planetary gear 18 and the second planetary gear 19 in the differential structure not only revolve, but also rotate, which will eventually cause the first half shaft 11 and the second rotating shaft to have different speeds (ie, realize the differential function), ensuring that The car runs normally.

In addition, in this embodiment, the large-diameter gear 171 is located between the small-diameter gear 172 and the first planetary gear 18 . That is to say, the large-diameter gear with larger size and heavier weight can be located at the first planetary gear 172 . The middle or near the middle of the planetary shaft 142, while the smaller and lighter small diameter gear 172 and the first planetary gear 18 can be located at or near both ends of the first planetary shaft 142, thus enabling The first planetary gear shaft 142 will not have uneven force due to multiple gears, which will help the first planetary gear shaft 142 to receive uniform force, improve its durability, and reduce the force when it rotates with the planet carrier 14 The amount of deformation ensures that the misalignment between the planet wheel and the sun wheel is small, which is beneficial to improving the overall performance of the motor drive assembly.

Among them, the coaxial and fixedly connected large-diameter gear 171 and the small-diameter gear 172 can together form a double gear 17, that is, the planet gear in the planet row structure can be a double gear.

Referring to Figure 1, optionally, the first planet wheel shaft 142 includes a large diameter part 1421 and a small diameter part 1422 that are coaxially connected, and the planet wheels in the planet row structure are sleeved on the small diameter part 1422, so The first planet gear 18 is sleeved on the large diameter portion 1421 .

In this embodiment, the first planet wheel shaft 142 in the planet row structure is not a shaft with a constant diameter. It includes a small diameter part 1422 and a large diameter part 1421. The small diameter part 1422 is used to install the planet wheels in the planet row structure. (That is, the aforementioned double gear 17), and the large diameter portion 1421 is used to install the first planetary gear 18 in the differential structure. On the one hand, it can make the first planetary gear shaft 142 as a whole not too slender (the thinner the shaft If it is too long, there may be a large amount of deformation during the rotation of the planet carrier 14, which will cause a large amount of misalignment when the planet gear and the sun gear mesh), thereby further reducing its deformation when rotating with the planet carrier 14. The amount of deformation ensures that the amount of misalignment when the planet gear and the sun gear are meshed is small, improving the overall performance of the motor drive assembly; on the other hand, since the first planet gear shaft 142 is not too slender as a whole, it is easy to ensure cylindricity during processing (The slender the shaft, the harder it is to ensure cylindricity); and, even if part of the first planet wheel shaft 142 is the large diameter part 1421, since the large diameter part 1421 is for the first planet wheel 18 to be sleeved, There is no need to arrange the ring gear 15 in the planet row structure on the radially outer side of the planet gear 18. In this way, although the large diameter part 1421 is thicker, it will not exceed the outer ring wall of the ring gear 15 in the radial direction, that is, it will not It will occupy additional space; on the other hand, since the first planetary gear 18 in the differential structure is a part that transmits torque to the first sun gear 20 and the second sun gear 21, it carries a relatively large torque, and the large-diameter part 1421 It can be well ensured that the first planetary gear 18 can carry larger torque.

It should be noted that the planet row structure in this embodiment can be a single-stage planet row, a bipolar planet row, or even more levels of planet rows. The number of planet rows is not limited.

Among them, the first half-shaft 11 can be the left half-shaft of the automobile or the right half-shaft of the automobile, and the same is true for the second half-shaft 12 .

Among them, both ends of the second planetary axle 143 are respectively installed on the two planet carrier bodies 141. Referring to Figure 2, the left planet carrier body 141 can be provided with an extension to the right. The left end of the second planetary axle 143 is specifically installed on the two planet carrier bodies 141. On the extension of the left planet carrier body 141, the right end of the second planet wheel shaft 143 is installed on the right planet carrier body 141.

Referring to Figure 1, optionally, the sun gear in the planet row structure is a third sun gear 16, the third sun gear 16 is sleeved on the first half shaft 11, and the motor 13 and The third sun gear 16 is drivingly connected, the large diameter gear 171 meshes with the third sun gear 16 , and the small diameter gear 172 meshes with the ring gear 15 in the planet row structure.

In this embodiment, the sun gear in the planet row structure is marked as the third sun gear 16, and the third sun gear 16 is sleeved on the first half shaft 11. As mentioned above, the third sun gear 16 serves as the planet row structure. The input end is connected to the motor 13 and driven by the motor 13.

In this embodiment, the planet row structure can be a single-stage planet row, with only a single planet row, that is, it has a sun gear (ie, the third sun gear 16 ), a ring gear 15 , a planet carrier 14 and is distributed in the ring gear. 15 and the planet gear between the third sun gear 16. Among them, the planet gear of the planet row structure is preferably a double gear 17, that is, it includes a large diameter gear 171 and a small diameter gear 172 that are fixedly connected. As mentioned above, when the planet gear meshes with the third sun gear 16, specifically The large-diameter gear 171 meshes with the third sun gear 16 , and the small-diameter gear 172 meshes with the ring gear 15 . In this way, even if the planetary row structure is a single planetary row, due to the existence of the double gear 17, it can still achieve the same large speed ratio reduction of the motor 13 as the traditional bipolar planetary row, and it is faster than the traditional double gearbox. The polar planet array requires fewer parts, is smaller and lighter.

The first sun gear 20 and the second sun gear 21 have the same number of teeth. Since the rotation speed of the first sun gear 20 represents the rotation speed of the first half shaft 11 and the rotation speed of the second sun gear 21 represents the rotation speed of the second half shaft 12, when the car is running straight, in order to ensure that the first half shaft 11 The rotation speed is the same as the rotation speed of the second half shaft 12, then the number of teeth of the first sun gear 20 and the second sun gear 21 needs to be the same.

Among them, the third sun gear 16 is sleeved on the first half shaft 11 , and the third sun gear 16 can be sleeved on the first half shaft 11 , that is, the third sun gear 16 can not be in contact with the first half shaft 11 , the two can rotate relative to each other.

Referring to Figure 1, optionally, the motor drive assembly also includes a housing 23 and a first bearing 24. The ring gear 15 in the planet row structure is fixed on the housing 23, and the two planet carriers The body 141 is rotatably connected to the housing 23 through the first bearing 24 respectively.

In this embodiment, as mentioned above, the ring gear 15 in the planetary row structure serves as a fixed part and can be fixed in the housing 23, and the housing 23 is connected to the whole vehicle in a suspended manner. In addition, the casing 23 can also place the motor 13, the planetary gear structure and the differential structure in it for protection. Since the planet carrier 14 is the output end of the planet row structure, it needs to rotate. Therefore, the two ends of the planet carrier 14 , specifically the two planet carrier bodies 141 , can each be installed and supported in the housing 23 through a first bearing 24 .

At least one end of the planet wheel shaft can be inserted into a preset blind hole on the planet carrier body 141 on the corresponding side to achieve axial limitation of the planet wheel shaft, and an elastic pin can be provided on the planet carrier body 141 to lock the planet. The wheel axle is circumferentially limited.

The first bearing 24 may be a four-point angular contact ball bearing, which has smaller axial clearance and radial clearance, higher efficiency, and will not affect the performance of the motor drive assembly.

Referring to Figure 2, optionally, the motor drive assembly further includes a second bearing 25, so that the sun gear in the planet row structure is a third sun gear 16, and the third sun gear 16 is sleeved on the On the first half shaft 11 , the third sun gear 16 is an axle structure. The axle structure includes a fixedly connected third wheel body 161 and a third axle body 162 . The third axle body 162 is sleeved on the first half shaft 11 . On the first half shaft 11 , the third wheel body 161 is disposed on one end of the third shaft body 162 close to the second half shaft 12 , and the rotor 131 of the motor 13 is disposed on the third shaft body 162 on, and the rotor 131 is used to rotate synchronously with the third shaft body 162 , and the third shaft body 162 is rotationally connected to the housing 23 through the second bearing 25 .

In this embodiment, the third sun gear 16 is an axle structure, which includes a relatively fixed third shaft body 162 and a third wheel body 161 . The third shaft body 162 is sleeved on the first half shaft 11 , and the motor 13 The rotor 131 is sleeved on the third shaft body 162. The rotor 131 can be keyed or interference-fitted with the third shaft body 162 to achieve synchronous rotation of the two. The third wheel body 161 is arranged on the third shaft body 162. One end, specifically the end close to the second half shaft 12 , meshes with the large diameter gear 171 in the planetary row structure. The third shaft body 162 can be supported on the inner wall of the housing 23 through two second bearings 25 .

2 , optionally, the third shaft body 162 includes a first shaft body 1621 , a second shaft body 1622 , a third shaft body 1623 , and a fourth shaft body 1624 that are coaxially connected in sequence. and the fifth-section shaft body 1625. The diameters of the third-section shaft body 1623, the second-section shaft body 1622, and the first-section shaft body 1621 decrease in sequence. The diameters of the third-section shaft body 1623, the The diameters of the fourth section shaft body 1624 and the fifth section shaft body 1625 decrease in sequence. In this way, before the third sun gear 16 is sleeved on the first half shaft 11, the motor 13 can be installed on the second shaft body 1622 through the first shaft body 1621, and the right end of the rotor 131 can contact the second half shaft 1622. The left end of the three-section shaft body 1623 can then install a second bearing 25 on the first section shaft body 1621 and contact the left end of the rotor 131 to pass through the third section shaft body 1623 and the second bearing 25 on the left side. After realizing the axial limitation of the rotor 131, another second bearing 25 can be installed to the fourth section shaft body 1624 through the fifth section shaft body 1625, and abut the right end of the third section shaft body 1623. Then a nut 28 is locked at the right end of the second bearing 25 on the right side to realize the axial limit of the second bearing 25 on the right side. The third section of the shaft body 1623 is equivalent to a shoulder and plays a positioning role. , there is no need to set parts on it, therefore, the axial length of the third section shaft body 1623 is the shortest to maximize the axial integration of the entire motor drive assembly. Among them, the third wheel body 161 is specifically provided on the fifth section axle body 1625, and it can be an integral structure with the fifth section axle body 1625.

Referring to Fig. 2, optionally, the motor drive assembly further includes a third bearing 26, and the second sun gear 21 is disposed on one end of the first half shaft 11 close to the second half shaft 12. The other end of the first half shaft 11 is rotatably connected to the housing 23 through the third bearing 26 .

In this embodiment, the left end of the first half shaft 11 can be movably supported on the inner wall of the housing 23 through a third bearing 26 to achieve movable support for the first half shaft 11 , and the second sun gear 21 can be disposed on the first half shaft 11 . The end of the half shaft 11 away from the third bearing 26. The inner wall of the second sun gear 21 can be installed on the first half shaft 11 through a snap ring to achieve a fixed relationship with the first half shaft 11. The second sun gear 21 passes through the second half shaft 11. The planet gear 19 is indirectly meshed with the first planet gear 18 .

Referring to Figure 2, optionally, the motor drive assembly further includes a fourth bearing 27, and the first sun gear 20 is disposed on one end of the second half shaft 12 close to the first half shaft 11, and the The second half shaft 12 is rotationally connected to the planet carrier body 141 or the housing 23 through the fourth bearing 27 , and the fourth bearing 27 is in contact with the first sun gear 20 .

In this embodiment, the first sun gear 20 is disposed on the second half shaft 12 . There may be a wear-resistant plate in front of the first sun gear 20 and the second sun gear 21 , and the wear-resistant plate is sleeved on the first half shaft 11 on the first sun gear 20 and the second sun gear 21 respectively, and the fourth bearing 27 sleeved on the second half shaft 12 abuts the first sun gear 20 away from the wear plate. On the other hand, the axial positioning of the first sun gear 20 can be achieved through the second bearing 25 and the wear-resistant plate. Moreover, the outer ring of the fourth bearing 27 is fixedly connected to the planet carrier body 141 or the housing 23. The fourth bearing 27 can then provide movable support for the rotation of the second half shaft 12. There is no need to provide additional components on the planet carrier body 141. The structure limits the position of the first sun gear 20 .

Referring to Figure 2, optionally, the planet carrier 14 further includes a middle support portion 144, which is connected to the two planet carrier bodies 141 respectively, wherein the middle support portion 144 is sleeved on each of the two planet carrier bodies 141. The large diameter part 1421 is close to one end of the small diameter part 1422.

In this embodiment, since the first planetary shaft 142 includes a large diameter part 1421 and a small diameter part 1422, the large diameter part 1421 and the small diameter part 1422 can be processed and formed separately. As mentioned above, it can be ensured that the small diameter part 1422 and the large diameter part 1422 can be formed separately. After the cylindricity of the part 1421, the large diameter part 1421 and the small diameter part 1422 can be formed, one end of the small diameter part 1422 can be inserted into the large diameter part 1421, and the hole on the middle support part of the planet carrier 14 can be connected with the large diameter part 1421. One end of the diameter portion 1421 close to the small diameter portion 1422 is interference-fitted to support the middle position of the first planetary shaft 142 and further enhance the strength of the first planetary shaft 142 and even the entire planetary carrier 14 .

In this embodiment, when there is a middle support part 144, the double gear 17 can directly abut against the middle support part 144 to achieve positioning. Of course, in other embodiments, if there is no intermediate support part 144, then the double gear 17 can abut on the step formed by the large diameter part 1421 and the small diameter part 1422 to achieve positioning.

In other embodiments, the positions of the large-diameter portion and the small-diameter portion can be interchanged, that is, the large-diameter portion 1421 is located on one side close to the first half-shaft 11 , and the small-diameter portion 1422 is located close to one side of the second half-shaft 12 .

Another embodiment of the present invention also provides an automobile transmission system, including the motor drive assembly as mentioned above.

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

Yet another embodiment of the present invention also provides an automobile, including the automobile transmission system as mentioned above.

Since the 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 understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, features defined by "first" and "second" may explicitly or implicitly include at least one of these features.

Although the present invention is disclosed as above, the protection scope of the present invention 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 invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims (10)

1. A motor drive assembly for driving the first half shaft (11) and the second half shaft (12). The motor drive assembly includes a motor (13) and a planetary row structure. The motor (13) It is drivingly connected to the planet row structure, and is characterized in that the planet carrier (14) in the planet row structure is the output end of the planet row structure, and the planet carrier (14) includes a first planet wheel shaft (142) , the second planet wheel shaft (143) and the two planet carrier bodies (141), the two ends of the first planet wheel shaft (142) and the second planet wheel shaft (143) are respectively installed on the two planet carrier bodies (141), the planet wheels in the planet row structure are sleeved on the first planet wheel shaft (142), and the planet wheels in the planet row structure include coaxial and fixedly connected large diameter gears (171 ) and small diameter gears (172); The motor drive assembly also includes a differential structure, which includes a first planet gear (18), a second planet gear (19), a first sun gear (20) and a second sun gear (21), The first sun gear (20) is arranged on one of the first half shaft (11) and the second half shaft (12), and the second sun gear (21) is arranged on the first half shaft (11) and the second half shaft (12). On the other one of the half shaft (11) and the second half shaft (12), the first planet gear (18) is sleeved on the first planet gear shaft (142), and the large planet gear The diameter gear (171) is located between the small diameter gear (172) and the first planet gear (18), and the second planet gear (19) is sleeved on the second planet gear shaft (143), And the first planet gear (18) meshes with the first sun, and the second planet gear (19) meshes with the first planet gear (18) and the second sun gear (21) respectively. 2. The motor drive assembly according to claim 1, characterized in that the sun gear in the planet row structure is a third sun gear (16), and the third sun gear (16) is sleeved on the on the first half shaft (11), and the motor (13) is drivingly connected to the third sun gear (16), and the large diameter gear (171) meshes with the third sun gear (16), The small diameter gear (172) meshes with the ring gear (15) in the planetary row structure. 3. The motor drive assembly according to claim 1, wherein the first planet wheel shaft (142) includes a large diameter part (1421) and a small diameter part (1422) coaxially connected, and the planet row The planet gear in the structure is sleeved on the small diameter part (1422), and the first planet gear (18) is sleeved on the large diameter part (1421). 4. The motor drive assembly according to claim 1, wherein the first sun gear (20) and the second sun gear (21) have the same number of teeth. 5. The motor drive assembly according to claim 1, further comprising a housing (23) and a first bearing (24), and the ring gear (15) in the planetary row structure is fixed to the housing. On the body (23), the two planet carrier bodies (141) are rotatably connected to the housing (23) through the first bearings (24). 6. The motor drive assembly according to claim 5, further comprising a second bearing (25), and the sun gear in the planet row structure is a third sun gear (16), and the third sun gear is The sun gear (16) is sleeved on the first half shaft (11), and the third sun gear (16) is an axle structure. The axle structure includes a fixedly connected third wheel body (161) and a third Shaft body (162), the third shaft body (162) is sleeved on the first half shaft (11), and the third wheel body (161) is disposed close to the third shaft body (162) One end of the second half shaft (12), the rotor (131) of the motor (13) is disposed on the third shaft body (162), and the rotor (131) is used to communicate with the third shaft body (162). The shaft body (162) rotates synchronously, and the third shaft body (162) is rotationally connected to the housing (23) through the second bearing (25). 7. The motor drive assembly according to claim 5, further comprising a third bearing (26), the second sun gear (21) being disposed on the first half shaft (11) close to the One end of the second half shaft (12) and the other end of the first half shaft (11) are rotationally connected to the housing (23) through the third bearing (26); And/or, the motor drive assembly further includes a fourth bearing (27), and the first sun gear (20) is disposed on the second half shaft (12) close to the first half shaft (11). One end, and the second half shaft (12) is rotationally connected to the planet carrier body (141) or the housing (23) through the fourth bearing (27), and the fourth bearing (27) Contact the first sun gear (20). 8. The motor drive assembly according to claim 3, characterized in that the planet carrier (14) further includes an intermediate support part (144), and the intermediate support part (144) is connected to the two planet carriers respectively. The body (141) is connected, wherein the middle support part (144) is sleeved on one end of the large diameter part (1421) close to the small diameter part (1422). 9. An automobile transmission system, characterized by comprising the motor drive assembly according to any one of claims 1-8. 10. An automobile, characterized by comprising the automobile transmission system according to claim 9.