Automotive and electric axle drive systems

Abstract

The embodiment of the present invention provides an electric axle drive system, including: a gearbox, including a first gear and a planetary gear device, the planetary gear device includes a planetary gear, a sun gear, the first gear and the sun gear are connected by a connecting shaft, and the first gear, the sun gear and the connecting shaft are integrally formed, and the sun gear and the planetary gear are meshed; a support plate, fixed to the housing of the gearbox, the support plate is located between the wheel disc of the sun gear and the wheel disc of the first gear; a differential, the first end of the housing of the differential is integrally formed with the planetary carrier of the planetary gear device; the first gear and the planetary gear device are jointly supported on the housing of the gearbox and the support plate, and the second end of the housing of the differential is supported on the housing of the gearbox. The automobile and electric axle drive system provided by the embodiment of the present invention ensure the transmission stability of the entire electric axle drive system, thereby improving the NVH control performance of the electric axle drive system.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of automobile technology, and in particular to an automobile and an electric axle drive system. Background Art

[0002] The electric drive mode of electric vehicles can basically be divided into two types: central motor drive and wheel hub motor drive. Among them, the central motor drive system mainly includes components such as electric motor, fixed speed ratio reducer and differential. In this drive system, since there is no clutch and transmission, the volume and mass of the mechanical transmission device can be reduced. The central motor drive system can also have another layout form, that is, the electric motor, fixed speed ratio reducer and differential are integrated into one, and two half shafts connect the two driving wheels. This layout form is called an electric axle drive system (eAxle drive system).

[0003] However, the transmission stability of current electric axle drive systems needs to be improved. Summary of the invention

[0004] The technical problem solved by the embodiments of the present invention is to provide an automobile and an electric axle drive system to improve the transmission stability of the electric axle drive system.

[0005] To solve the above problems, an embodiment of the present invention provides a vehicle and an electric axle drive system, including:

[0006] A gearbox, comprising a first gear and a planetary gear device, wherein the planetary gear device comprises a planetary gear and a sun gear, wherein the first gear and the sun gear are connected via a connecting shaft, and the first gear, the sun gear and the connecting shaft are integrally formed or torsionally connected, and the sun gear is meshed with the planetary gear;

[0007] A support plate, fixed to the housing of the gearbox, wherein the support plate is located between the wheel disc of the sun gear and the wheel disc of the first gear;

[0008] a differential, wherein a first end of a housing of the differential is integrally formed with a planet carrier of the planetary gear device;

[0009] The first gear and the planetary gear device are commonly supported on a housing and a support plate of a gearbox, and a second end of the housing of the differential is supported on the housing of the gearbox.

[0010] Optionally, the electric shaft drive system further includes:

[0011] A first radial bearing and a second radial bearing, the first gear and the planetary gear device are supported on the housing and the support plate of the gearbox through the first radial bearing and the second radial bearing.

[0012] Optionally, the first radial bearing and the second radial bearing are respectively arranged on both sides of the first gear, the outer ring of the first radial bearing is arranged on the housing of the gearbox, and the inner ring of the first radial bearing is sleeved on the extended shaft section of the connecting shaft;

[0013] The outer ring of the second radial bearing is arranged on the supporting plate, and the inner ring of the second radial bearing is sleeved on the connecting shaft.

[0014] Optionally, the outer ring of the first radial bearing is arranged in the inner hole of the first gear, and the inner ring of the first radial bearing is sleeved on the housing of the gearbox;

[0015] The outer ring of the second radial bearing is arranged on the support plate, and the inner ring of the second radial bearing is sleeved on the planet carrier.

[0016] Optionally, the electric shaft drive system further includes a third axial thrust bearing, and the third axial thrust bearing is placed between the wheel disc of the first gear and the housing of the gearbox or the support plate.

[0017] Optionally, the electric shaft drive system further includes:

[0018] Motor;

[0019] The gearbox further comprises a second gear meshing with the first gear, and an input shaft of the second gear is integrally formed with or non-rotatably connected to a rotor shaft of the motor.

[0020] Optionally, the second gear is supported on the housing of the electric shaft drive system through the rotor shaft of the motor.

[0021] Optionally, the electric axle drive system further comprises a fourth bearing, and the second end of the housing of the differential is supported on the housing of the gearbox via the fourth bearing.

[0022] Optionally, the electric shaft drive system further comprises a fifth bearing, and the second gear is supported on the housing of the gearbox via the fifth bearing.

[0023] In order to solve the above problems, an embodiment of the present invention provides a vehicle, comprising an electric axle drive system as described in any one of the above items.

[0024] Compared with the prior art, the technical solution of the embodiment of the present invention has the following advantages:

[0025] The automobile and electric axle drive system provided in the embodiment of the present invention, the electric axle drive system includes: a gearbox, including a first gear and a planetary gear device, the planetary gear device includes a planetary gear and a sun gear, the first gear and the sun gear are connected by a connecting shaft, and the first gear, the sun gear and the connecting shaft are integrally formed, and the sun gear and the planetary gear are meshed; a support plate is fixed to the housing of the gearbox, the support plate is located between the wheel disc of the sun gear and the wheel disc of the first gear; a differential, the first end of the housing of the differential is integrally formed with the planetary carrier of the planetary gear device; the first gear and the planetary gear device are jointly supported on the housing of the gearbox and the support plate, and the second end of the housing of the differential is supported on the housing of the gearbox.

[0026] By forming the first gear, the sun gear and the connecting shaft as one piece, it is avoided to connect the output shaft of the first gear and the input shaft of the sun gear through a spline, so the integrated structure of the first gear and the sun gear improves the structural stability and the NVH (Noise, Vibration, Harshness) control performance of the electric shaft drive system. Because the sun gear is meshed with the planetary gear, the planetary carrier of the planetary gear device and the housing of the differential are formed as one piece, therefore, the first gear and the sun gear are integrated into one piece, the sun gear is meshed with the planetary gear, and the planetary gear runs around the planetary carrier, and the planetary carrier and the first end of the housing of the differential are integrated into one piece. It can be seen that the first gear, the planetary gear device and the housing of the differential are integrated by means of integrated molding and gear meshing, so only a few of the components need to be supported to ensure the stability of the entire system.

[0027] By supporting the first gear on the housing of the gearbox, it is possible to avoid the first gear from tilting due to the axial force, radial force or tangential force during the rotation process, resulting in poor transmission stability of the system. Since the first gear, the planetary gear device and the housing of the differential can be regarded as a non-rigidly connected whole, the stability of the first gear, the planetary gear device and the housing of the differential can be ensured by supporting the first gear and the planetary gear device at the same time. However, considering the complexity of the processing of the gearbox housing, the first gear, the planetary gear device and the housing of the differential cannot be fully supported on the housing of the gearbox. The present invention supports the first gear and the planetary gear device by fixing a support plate on the gearbox housing, and supporting the part that cannot be directly fixed on the housing of the gearbox on the support plate. On the one hand, if the first gear, the planetary gear device and the housing of the differential are regarded as a whole, the connecting shaft area of ​​the first gear and the sun gear can be regarded as the middle area of ​​the whole, and a support plate is arranged between the wheel disc of the first gear and the wheel disc of the sun gear, and the planetary gear device is supported on the support plate, which is conducive to improving the structural stability of the entire electric shaft drive system. On the other hand, there is enough axial space between the first gear and the sun gear for arranging the support plate. Therefore, by supporting the first gear and the planetary gear device together on the housing and support plate of the gearbox, the transmission stability of the first gear, the planetary gear device and the differential housing can be ensured, thereby improving the NVH control performance of the electric axle drive system.

[0028] In addition, since the output speed of the electric shaft is relatively high, the gear set formed by the first gear and other gears first reduces speed and increases torque, and then outputs the lower speed to the planetary gear set through the sun gear, which can improve the stability of the planetary gear device, and the planetary gear set is arranged at the end of the electric shaft drive system, so that the planetary gear set is in a lower position of the gearbox, and thus the planetary gear device also has better lubrication performance.

[0029] In an optional solution, the electric shaft drive system further includes a first radial bearing and a second radial bearing, and the first gear and the planetary gear device are jointly supported on the housing of the gearbox and the support plate through the first radial bearing and the second radial bearing. Compared with directly contacting the first gear with the housing of the gearbox and contacting the planetary gear device with the support plate, the first radial bearing and the second radial bearing can respectively convert the sliding friction between the two connected parts into rolling friction inside the first radial bearing or the second radial bearing. Both the first radial bearing and the second radial bearing are radial bearings, which can withstand a certain axial force in addition to the radial force, so that the stability of the first gear and the sun gear can be guaranteed in both radial and axial directions, and the first radial bearing and the second radial bearing can be fully lubricated inside, reducing the wear between the first gear and the housing of the gearbox and between the planetary gear device and the support plate, thereby extending the service life of the entire electric shaft drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0031] Figure 1 is a schematic diagram of an electric shaft drive system provided by an embodiment of the present invention;

[0032] Figure 2 is a schematic diagram of an electric shaft drive system provided by another embodiment of the present invention.

[0033] Among them: 10-gearbox; 101-first gear; 102-second gear; 20-support plate; 200-planetary gear; 30-differential; 300-sun gear; 40-fourth bearing; 400-planet carrier; 50-third axial thrust bearing; 60-first radial bearing; 70-motor; 80-second radial bearing; 800-planetary gear device; 301-first end of the differential housing; 302-second end of the differential housing; 90-fifth bearing. DETAILED DESCRIPTION

[0034] It can be seen from the background technology that the transmission stability of the current electric axle drive system needs to be improved.

[0035] In order to improve the transmission stability of the electric axle drive system, an embodiment of the present invention provides an automobile and an electric axle drive system. The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] Please refer to Figure 1 , Figure 1 It is a schematic diagram of an electric axle drive system provided by an embodiment of the present invention.

[0037] like Figure 1 As shown, an electric shaft drive system provided by an embodiment of the present invention includes:

[0038] The gearbox 10 comprises a first gear 101 and a planetary gear device 800, wherein the planetary gear device 800 comprises a planetary gear 200 and a sun gear 300, wherein the first gear 101 and the sun gear 300 are connected via a connecting shaft, and the first gear 101, the sun gear 300 and the connecting shaft are integrally formed, and the sun gear 300 is meshed with the planetary gear 200;

[0039] A support plate 20 is fixed to the housing of the gearbox 10, and the support plate 20 is located between the wheel disc of the sun gear 300 and the wheel disc of the first gear 101;

[0040] A differential 30, wherein a first end 301 of a housing of the differential is integrally formed with a planet carrier 400 of the planetary gear device 800;

[0041] The first gear 101 and the planetary gear device 800 are jointly supported on the housing of the gearbox 10 and the support plate 20 , and the second end 302 of the housing of the differential is supported on the housing of the gearbox 10 .

[0042] There may be many specific implementation methods for integrally forming the first gear 101, the sun gear 300 and the connecting shaft. In the present embodiment, the first gear 101, the sun gear 300 and the connecting shaft are integrally forged. In other embodiments, the first gear, the sun gear and the connecting shaft may be integrated together by turning, welding or casting.

[0043] The first end 301 of the differential housing is integrally formed with the planet carrier 400 of the planetary gear device 800, that is, the first end 301 of the differential housing and the planet carrier 400 of the planetary gear device 800 are integrated together, and the integration method can be forging, turning, welding, or casting.

[0044] The first gear 101 may be directly supported on the housing of the gearbox 10 , or may be indirectly supported on the housing of the gearbox 10 via a bushing or a bearing.

[0045] The planetary gear device 800 may be directly supported on the support plate 20 , or may be indirectly supported on the support plate 20 via a bushing or a bearing.

[0046] The first gear 101 and the planetary gear device 800 are jointly supported on the housing of the gearbox 10 and the support plate 20, which means that the first gear 101 and the planetary gear device 800 can be stably supported on the housing of the gearbox 10 and the support plate 20 in both the axial and radial directions.

[0047] The electric shaft drive system provided by the embodiment of the present invention avoids connecting the output shaft of the first gear 101 and the input shaft of the sun gear 300 through a spline by forming the first gear 101, the sun gear 300 and the connecting shaft in one piece, so the integrated structure of the first gear 101 and the sun gear 300 improves the structural stability and the NVH (Noise, Vibration, Harshness) control performance of the electric shaft drive system. Since the sun gear 300 is meshed with the planetary gear, the planetary carrier of the planetary gear device 800 is integrally formed with the housing of the differential 30, therefore, the first gear 101 and the sun gear 300 are integrated into one, the sun gear 300 is meshed with the planetary gear, and the planetary gear runs around the planetary carrier, and the planetary carrier is integrated with the first end of the housing of the differential 30. It can be seen that the first gear 101, the planetary gear device 800 and the housing of the differential 30 are integrated by integral molding and gear meshing, so only a few components need to be supported to ensure the stability of the entire system.

[0048] By supporting the first gear 101 on the housing of the gearbox, it is possible to avoid the first gear 101 from tilting due to axial force, radial force or tangential force during rotation, resulting in poor system transmission stability. Moreover, since the first gear 101, the housing of the planetary gear device 800 and the differential 30 can be regarded as a non-rigidly connected whole, the overall stability of the first gear 101, the planetary gear device 800 and the housing of the differential 30 can be ensured by supporting the first gear 101 and the planetary gear device 800 at the same time. However, considering the complexity of the gearbox housing processing, the first gear 101, the planetary gear device 800 and the housing of the differential 30 cannot be fully supported on the gearbox housing as a whole. In the present invention, a support plate 20 is fixed to the gearbox housing, and the portion that cannot be directly fixed to the gearbox housing is supported on the support plate 20 to support the first gear 101 and the planetary gear device 800. On the one hand, if the first gear 101, the planetary gear device 800 and the housing of the differential 30 are regarded as one body, the connecting shaft area of ​​the first gear 101 and the sun gear 300 can be regarded as an integrated middle area, and a support plate 20 is provided between the wheel disc of the first gear 101 and the wheel disc of the sun gear 300, and the planetary gear device 800 is supported on the support plate 20, which is conducive to improving the structural stability of the entire electric shaft drive system. On the other hand, there is enough axial space between the first gear 101 and the sun gear 300 for setting the support plate 20. Therefore, by supporting the first gear 101 on the housing of the gearbox and the planetary gear device 800 on the support plate 20, the transmission stability of the first gear 101, the planetary gear device 800 and the housing of the differential 30 can be ensured, thereby improving the NVH control performance of the electric shaft drive system.

[0049] In addition, since the output speed of the electric shaft is relatively high, the gear set formed by the first gear 101 and other gears first reduces speed and increases torque, and then outputs the lower speed to the planetary gear set through the sun gear 300, which can improve the stability of the planetary gear device 800, and the planetary gear set is arranged at the end of the electric shaft drive system, so that the planetary gear set is in a lower position of the gearbox, and thus the planetary gear device 800 also has better lubrication performance.

[0050] In one embodiment, the electric shaft drive system includes a first radial bearing 60 and a second radial bearing 80, and the first gear 101 and the planetary gear device 800 are jointly supported on the housing of the gearbox 10 and the support plate 20 through the first radial bearing 60 and the second radial bearing 80. Compared with directly contacting the first gear 101 with the housing of the gearbox 10 and contacting the planetary gear device 800 with the support plate 20, the first radial bearing 60 and the second radial bearing 80 can respectively convert the sliding friction between the two connected parts into rolling friction inside the first radial bearing 60 or the second radial bearing 80. The first radial bearing 60 and the second radial bearing 80 are both radial bearings, which can withstand a certain axial force in addition to the radial force, so that the stability of the first gear 101 and the sun gear 300 can be ensured in both radial and axial directions, and the first radial bearing 60 and the second radial bearing 80 can be sufficiently lubricated inside, reducing the wear between the first gear 101 and the housing of the gearbox 10 and between the planetary gear device 800 and the support plate 20, thereby extending the service life of the entire electric shaft drive system.

[0051] In a specific embodiment, the first radial bearing 60 and the second radial bearing 80 are respectively arranged on both sides of the first gear 101, the outer ring of the first radial bearing 60 is arranged on the housing of the gearbox 10, and the inner ring of the first radial bearing 60 is sleeved on the extended shaft section of the connecting shaft; the outer ring of the second radial bearing 80 is arranged on the support plate 20, and the inner ring of the second radial bearing 80 is sleeved on the connecting shaft.

[0052] By jointly supporting the first gear 101 and the sun gear 300 with the first radial bearing 60 and the second radial bearing 80, and supporting the second end 302 of the differential housing on the housing of the gearbox 10, the first radial bearing 60 and the second radial bearing 80 cooperate to ensure the stability of the first gear 101, and the structure at the sun gear connecting shaft has a large axial overhang. Arranging the second radial bearing 80 here can ensure the stability of the sun gear, and the overall structure is simple.

[0053] Please refer to Figure 2 In a specific embodiment, the outer ring of the first radial bearing 60 is arranged in the inner hole of the first gear 101, and the inner ring of the first radial bearing 60 is sleeved on the housing of the gearbox 10;

[0054] The outer ring of the second radial bearing 80 is disposed on the support plate 20 , and the inner ring of the second radial bearing 80 is sleeved on the planet carrier 400 .

[0055] Compared with the previous embodiment in which the outer ring of the first radial bearing 60 is directly arranged on the housing of the gearbox 10, the inner ring of the first radial bearing 60 is sleeved on the housing of the gearbox, and the outer ring of the first radial bearing 60 is arranged in the inner hole of the first gear 101, which can save axial space, that is, the extended shaft section of the connecting shaft between the first gear and the sun gear in the previous embodiment is omitted, thereby making the overall structure more compact.

[0056] In a specific embodiment, the electric shaft drive system also includes a third axial thrust bearing 50, which is arranged between the wheel disc of the first gear 101 and the housing of the gearbox or the support plate 20, and can ensure the stability of the first gear 101 in the axial direction, thereby further improving the transmission stability of the entire electric shaft drive system and improving the NVH control performance of the electric shaft drive system.

[0057] Combination Figure 1 and Figure 2 In a specific embodiment, the electric shaft drive system further includes: a motor 70; the gearbox 10 further includes a second gear 102, the second gear 102 is meshed with the first gear 101, and the input shaft of the second gear 102 is integrally formed with the rotor shaft of the motor 70. In other embodiments, the input shaft of the second gear 102 and the rotor shaft of the motor 70 can also be connected together by welding or spline connection.

[0058] By forming the input shaft of the second gear 102 and the rotor shaft of the motor 70 as one piece, the conventional spline connection between the output shaft of the motor 70 and the input shaft of the second gear 102 is avoided, which not only makes the device structure more compact, but also saves costs. Moreover, the motor 70 and the transmission share a housing. In a traditional transmission system, the motor 70 and the transmission are independent, that is, the motor 70 body needs a housing, the transmission 10 body needs a housing, plus the rear cover of the outermost motor 70 and the front cover of the transmission 10, a total of 4 housings are required. By using the motor 70 and the differential 30 to share a housing, that is, the housing of the motor 70 body and the housing of the differential 30 body are combined into one housing, plus the rear cover of the outermost motor 70 and the front cover of the transmission 10, only 3 housings are required, thereby reducing the number of connecting bolts, reducing the weight of the entire electric axle drive system, reducing costs, and improving reliability.

[0059] In a specific embodiment, the second end 302 of the differential housing is radially supported on the housing of the gearbox 10 through the fourth bearing 40. Since the first end 301 of the differential housing is integrated with the planet carrier 400, the first end of the differential 30 integrated with the planet carrier 400 is stable, and the second end 302 of the differential housing is supported by the third axial thrust bearing 50. Compared with supporting the second end 302 of the differential housing by a bushing, the bearing can adapt to a higher speed while ensuring the stability of the housing of the differential 30.

[0060] In a specific embodiment, the electric shaft drive system further includes a fifth bearing 90, and the second gear 102 is supported on the housing of the gearbox 10 through the fifth bearing 90. In other embodiments, the second gear 102 can also be supported on the housing of the electric shaft drive system through the rotor shaft of the motor.

[0061] The outer ring of the fifth bearing 90 is in contact with the housing of the gearbox 10, the fifth bearing 90 and the motor shaft bearing are arranged on both sides of the wheel of the second gear 102, and the inner ring of the fifth bearing 90 is sleeved on the input shaft of the second gear 102. Therefore, the second gear 102 has better transmission stability, which improves the stability of the electric shaft drive system, thereby helping to improve the NVH control performance of the electric shaft drive system.

[0062] In this embodiment, the ring gear of the planetary gear device 800 is fixed on the housing of the gearbox 10, so the transmission stability of the entire electric shaft drive system is better.

[0063] An embodiment of the present invention further provides a vehicle, comprising the above-mentioned electric axle drive system, wherein the electric axle drive system comprises:

[0064] The gearbox 10 comprises a first gear 101 and a planetary gear device 800, wherein the planetary gear device 800 comprises a planetary gear 200 and a sun gear 300, wherein the first gear 101 and the sun gear 300 are connected via a connecting shaft, and the first gear 101, the sun gear 300 and the connecting shaft are integrally formed, and the sun gear 300 is meshed with the planetary gear 200;

[0065] A support plate 20 is fixed to the housing of the gearbox 10, and the support plate 20 is located between the wheel disc of the sun gear 300 and the wheel disc of the first gear 101;

[0066] A differential 30, wherein a first end 301 of a housing of the differential is integrally formed with a planet carrier 400 of the planetary gear device 800;

[0067] The first gear 101 and the planetary gear device 800 are jointly supported on the housing of the gearbox 10 and the support plate 20 , and the second end 302 of the housing of the differential is radially supported on the housing of the gearbox 10 .

[0068] By forming the first gear 101, the sun gear 300 and the connecting shaft as one piece, it is avoided to connect the output shaft of the first gear 101 and the input shaft of the sun gear 300 through a spline. Therefore, the integrated structure of the first gear 101 and the sun gear 300 improves the structural stability and improves the NVH of the electric shaft drive system.

[0069] (Noise, Vibration, Harshness) control performance. Since the sun gear 300 is meshed with the planetary gears, the planetary carrier of the planetary gear device 800 is integrally formed with the housing of the differential 30, therefore, the first gear 101 and the sun gear 300 are integrated into one, the sun gear 300 is meshed with the planetary gears, and the planetary gears run around the planetary carrier, and the planetary carrier is integrated with the first end of the housing of the differential 30. It can be seen that the first gear 101, the planetary gear device 800 and the housing of the differential 30 are integrated by integral molding and gear meshing, so only a few components need to be supported to ensure the stability of the entire system.

[0070] By supporting the first gear 101 on the housing of the gearbox, it is possible to avoid the first gear 101 from tilting due to axial force, radial force or tangential force during rotation, resulting in poor system transmission stability. Moreover, since the first gear 101, the housing of the planetary gear device 800 and the differential 30 can be regarded as a non-rigidly connected whole, the overall stability of the first gear 101, the planetary gear device 800 and the housing of the differential 30 can be ensured by supporting the first gear 101 and the planetary gear device 800 at the same time. However, considering the complexity of the gearbox housing processing, the first gear 101, the planetary gear device 800 and the housing of the differential 30 cannot be fully supported on the gearbox housing as a whole. In the present invention, a support plate 20 is fixed to the gearbox housing, and a portion that cannot be directly fixed to the gearbox housing is supported on the support plate 20 to support the first gear 101 and the planetary gear device 800. On the one hand, if the first gear 101, the planetary gear device 800 and the housing of the differential 30 are regarded as one body, the connecting shaft area of ​​the first gear 101 and the sun gear 300 can be regarded as an integrated middle area, and a support plate 20 is provided between the wheel disc of the first gear 101 and the wheel disc of the sun gear 300, and the planetary gear device 800 is supported on the support plate 20, which is conducive to improving the structural stability of the entire electric shaft drive system. On the other hand, there is enough axial space between the first gear 101 and the sun gear 300 for setting the support plate 20. Therefore, by supporting the first gear 101 and the planetary gear device 800 together on the housing of the gearbox and the support plate 20, the transmission stability of the first gear 101, the planetary gear device 800 and the housing of the differential 30 can be ensured, thereby improving the NVH control performance of the electric shaft drive system.

[0071] In addition, since the output speed of the electric shaft is relatively high, the gear set formed by the first gear 101 and other gears first reduces speed and increases torque, and then outputs the lower speed to the planetary gear set through the sun gear 300, which can improve the stability of the planetary gear device 800, and the planetary gear set is arranged at the end of the electric shaft drive system, so that the planetary gear set is in a lower position of the gearbox, and thus the planetary gear device 800 also has better lubrication performance.

[0072] Although the embodiments of the present invention are disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. An electric shaft drive system, characterized in that: include: A gearbox, comprising a first gear and a planetary gear device, wherein the planetary gear device comprises a planetary gear and a sun gear, wherein the first gear and the sun gear are connected via a connecting shaft, and the first gear, the sun gear and the connecting shaft are integrally formed, and the sun gear is meshed with the planetary gear; A support plate, fixed to the housing of the gearbox, wherein the support plate is located between the wheel disc of the sun gear and the wheel disc of the first gear; a differential, wherein a first end of a housing of the differential is integrally formed with a planet carrier of the planetary gear device; The first gear and the planetary gear device are jointly supported on a housing and a support plate of a gearbox, and the second end of the housing of the differential is supported on the housing of the gearbox; a first radial bearing and a second radial bearing, wherein the first gear and the planetary gear device are supported on a housing and a support plate of the gearbox through the first radial bearing and the second radial bearing; The outer ring of the first radial bearing is arranged in the inner hole of the first gear, and the inner ring of the first radial bearing is sleeved on the housing of the gearbox; The outer ring of the second radial bearing is arranged on the support plate, and the inner ring of the second radial bearing is sleeved on the planet carrier; It also includes a third axial thrust bearing, which is placed between the wheel disc of the first gear and the housing of the gearbox or the support plate.

2. The electric shaft drive system according to claim 1, characterized in that: Also includes: Motor; The gearbox further comprises a second gear meshing with the first gear, and an input shaft of the second gear is integrally formed with or non-rotatably connected to a rotor shaft of the motor.

3. The electric shaft drive system according to claim 2, characterized in that: It also includes a fourth bearing, and the second end of the housing of the differential is supported on the housing of the gearbox through the fourth bearing.

4. The electric shaft drive system according to claim 2, characterized in that: It also includes a fifth bearing, and the second gear is supported on the housing of the gearbox through the fifth bearing.

5. The electric shaft drive system according to claim 2, characterized in that: The second gear is supported on the housing of the electric shaft drive system through the motor rotor shaft.

6. A car, characterized in that: It comprises an electric shaft drive system as described in any one of claims 1 to 5.

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