Drive system and vehicle

Abstract

The application relates to the technical field of vehicle engineering, in particular to a driving system and a vehicle. The driving system comprises a sealing assembly, a driving device and an output shaft. The driving device comprises a differential assembly and a first shell. The first shell forms a containing cavity and a mounting hole. The output shaft comprises a solid shaft part and a hollow shaft part. The solid shaft part is connected with the differential assembly. The hollow shaft part is connected with the solid shaft part and extends towards the direction of the mounting hole. The hollow shaft part is used for connecting an external transmission shaft. The sealing assembly is arranged between the outer side wall of the hollow shaft part and the inner side wall of the mounting hole. The design can realize isolation at the assembly gap between the output shaft and the external transmission shaft through the solid shaft part, and realize isolation at the assembly gap between the output shaft and the mounting hole through the sealing assembly. The design can reduce the risk of external foreign matters entering the containing cavity from the assembly gap, and can also reduce the risk of oil in the containing cavity leaking to the outside from the assembly gap.

Description

Technical Field

[0001] This application relates to the technical field of vehicle engineering, specifically to a drive system and a vehicle. Background Technology

[0002] In the prior art, the motor is connected to the reducer, the reducer is connected to the differential assembly, and the motor, reducer and differential assembly are housed in an outer housing. The external drive shaft is inserted into the outer housing and connected to the differential assembly. With this design, before the external drive shaft is assembled with the differential assembly, foreign objects from the outside may enter the outer housing due to insufficient sealing performance between the outer housing and the outside world. It may also cause the lubricating oil used for the motor and reducer to leak to the outside. Utility Model Content

[0003] The purpose of this application is to provide a drive system and a vehicle.

[0004] This application provides a drive system, including: a sealing assembly; a drive device including a differential assembly and a first housing, the first housing forming a receiving cavity and a mounting hole; an output shaft including a solid shaft portion and a hollow shaft portion, the solid shaft portion being connected to the differential assembly, the hollow shaft portion being connected to the solid shaft portion and extending toward the mounting hole, the hollow shaft portion being used to connect an external drive shaft, and the sealing assembly being disposed between the outer sidewall of the hollow shaft portion and the inner sidewall of the mounting hole.

[0005] In some embodiments, the differential assembly includes a differential and a second housing, the differential being housed within the second housing, and the solid shaft portion passing through the second housing and connected to the differential.

[0006] In some embodiments, the sealing assembly includes: a seal, comprising a first sealing portion, a main body portion, and a second sealing portion sequentially connected along the radial direction of the output shaft, wherein the first sealing portion is disposed between the inner sidewall of the mounting hole and the main body portion, and the second sealing portion is disposed between the outer sidewall of the hollow shaft portion and the main body portion; and a first cover, comprising a first cover plate and a second cover plate disposed at an angle, wherein the first cover plate abuts against the second sealing portion and the outer sidewall of the hollow shaft portion, and the second cover plate is disposed on the side of the second sealing portion away from the receiving cavity.

[0007] In some embodiments, the sealing assembly includes: a seal, comprising a first sealing portion, a main body portion, and a second sealing portion sequentially connected along the radial direction of the output shaft, wherein the first sealing portion is disposed between the inner sidewall of the mounting hole and the main body portion, and the second sealing portion is disposed between the outer sidewall of the hollow shaft portion and the main body portion; and a second cover, disposed on the side of the seal opposite to the receiving cavity, wherein the second cover forms a mounting groove, and the mounting groove engages with a portion of the second sealing portion.

[0008] In some embodiments, the second sealing portion includes a first sealing lip, a second sealing lip, and a third sealing lip connected to the main body portion, wherein the first sealing lip extends toward the side close to the receiving cavity, and the second sealing lip and the third sealing lip extend toward the side away from the receiving cavity.

[0009] In some embodiments, the first sealing portion includes a limiting portion, and the inner sidewall of the mounting hole forms a limiting hole, the limiting portion being engaged in the limiting hole.

[0010] In some embodiments, the drive system includes a reducer and a rotating component. The reducer is disposed in the accommodating cavity and connected to the differential assembly. The rotating component is disposed between the outer side wall of the hollow shaft and the inner side wall of the mounting hole. The sealing assembly is disposed on the side of the rotating component opposite to the reducer.

[0011] In some embodiments, the drive device further includes a motor disposed in the accommodating cavity, the motor being connected to the reducer and protruding to one side of the second housing, the mounting hole including a first mounting hole located near the motor and a second mounting hole located near the reducer; the output shaft includes a first half-shaft and a second half-shaft, the length of the first half-shaft being greater than the length of the second half-shaft, the first half-shaft being connected to the differential assembly and extending toward the first mounting hole, the second half-shaft being connected to the differential assembly and extending toward the second mounting hole, the sealing assembly being disposed between the outer side wall of the first half-shaft and the inner side wall of the first mounting hole, and the sealing assembly being disposed between the outer side wall of the second half-shaft and the inner side wall of the second mounting hole.

[0012] In some embodiments, the differential includes a half-shaft gear, a first spline is formed on the radially outer side of the solid shaft portion, the first spline meshing with the half-shaft gear; a mating hole is formed in the hollow shaft portion, a second spline is formed in the mating hole, the mating hole is for inserting the external drive shaft, and the second spline is for meshing with the external drive shaft.

[0013] This application also provides a vehicle including the aforementioned drive system.

[0014] The drive system and vehicle proposed in this application have the following advantages: The drive unit includes a differential assembly and a first housing, the first housing forming a receiving cavity and a mounting hole; the output shaft includes a solid shaft portion and a hollow shaft portion, the solid shaft portion being connected to the differential assembly, and the hollow shaft portion being connected to the solid shaft portion and extending towards the mounting hole, the hollow shaft portion being used to connect an external drive shaft, and a sealing assembly being disposed between the outer side wall of the hollow shaft portion and the inner side wall of the mounting hole. The first housing forms a receiving cavity for accommodating the differential assembly, one end of the output shaft is driven to connect to the differential assembly, and the other end is connected to the external drive shaft, the differential driving the output shaft to rotate, thereby driving the wheels to rotate. Specifically, the solid shaft portion of the output shaft is inserted into the receiving cavity and connected to the differential, and the hollow shaft portion of the output shaft is inserted into the mounting hole and connected to the external drive shaft. A sealing assembly is installed between the inner wall of the mounting hole and the outer wall of the hollow shaft. This design isolates the output shaft and the external drive shaft at the assembly gap through the solid shaft, and isolates the output shaft and the mounting hole at the assembly gap through the sealing assembly. This reduces the risk of foreign objects entering the cavity from the assembly gap, and also reduces the risk of oil leaking from the cavity to the outside from the assembly gap.

[0015] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 This is a schematic diagram of the structure of a drive system according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the first cross-section at point AA in the middle; Figure 3 This is a schematic diagram of one embodiment of the sealing component in this utility model. Figure 4 This is a schematic diagram of another embodiment of the sealing component in this utility model; Figure 5 yes Figure 1 Schematic diagram of the second cross section at point AA; Figure 6 yes Figure 5 Enlarged schematic diagram of the middle part of the structure.

[0019] Explanation of reference numerals in the attached figures: 100. Sealing assembly; 110. Seal; 111. First sealing part; 1111. Limiting part; 112. Main body; 113. Second sealing part; 1131. First sealing lip; 1132. Second sealing lip; 1133. Third sealing lip; 120. First cover; 121. First cover plate; 122. Second cover plate; 130. Second cover; 131. Mounting groove; 200. Drive unit; 210. Differential assembly; 211. Differential; 2111. Half-shaft gear; 212. Second... Housing; 2121, First housing part; 2122, Second housing part; 220, First housing; 221, Receiving cavity; 222, Mounting hole; 2221, Limiting hole; 2222, First mounting hole; 2223, Second mounting hole; 300, Output shaft; 301, First half shaft; 302, Second half shaft; 310, Solid shaft part; 311, First spline; 320, Hollow shaft part; 321, Mating hole; 3211, Second spline; 400, Reducer; 500, Rotating component; 600, Motor. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] In the prior art, the motor is connected to the reducer, the reducer is connected to the differential assembly, and the motor, reducer and differential assembly are housed in an outer housing. The external drive shaft is inserted into the outer housing and connected to the differential assembly. With this design, before the external drive shaft is assembled with the differential assembly, foreign objects from the outside may enter the outer housing due to insufficient sealing performance between the outer housing and the outside world. It may also cause the lubricating oil used for the motor and reducer to leak to the outside.

[0024] To solve the above technical problems, refer to Figure 1 and Figure 2 As shown, this application provides a drive system including a sealing assembly 100, a drive device 200 and an output shaft 300. The output shaft 300 is connected to the drive device 200. The sealing assembly 100 is provided between the output shaft 300 and the drive device 200 to prevent dust from entering the drive device 200 and internal oil from leaking to the outside.

[0025] In some implementations, refer to Figure 2As shown, the drive unit 200 includes a differential assembly 210 and a first housing 220. The first housing 220 forms a receiving cavity 221 and a mounting hole 222. The output shaft 300 includes a solid shaft portion 310 and a hollow shaft portion 320. The solid shaft portion 310 is connected to the differential assembly 210, and the hollow shaft portion 320 is connected to the solid shaft portion 310 and extends toward the mounting hole 222. The hollow shaft portion 320 is used to connect an external drive shaft. A sealing assembly 100 is disposed between the outer side wall of the hollow shaft portion 320 and the inner side wall of the mounting hole 222. The first housing 220 has a receiving cavity 221 inside for accommodating the differential assembly 210. One end of the output shaft 300 is drivenly connected to the differential assembly 210, and the other end is connected to an external drive shaft. The differential 211 drives the output shaft 300 to rotate, thereby driving the wheels to rotate. Specifically, the solid shaft portion 310 of the output shaft 300 is inserted into the accommodating cavity 221 and connected to the differential 211, while the hollow shaft portion 320 of the output shaft 300 is inserted into the mounting hole 222 and connected to the external drive shaft. A sealing assembly 100 is provided between the inner wall of the mounting hole 222 and the outer wall of the hollow shaft portion 320. This design isolates the output shaft 300 from the assembly gap between the solid shaft portion 310 and the external drive shaft, and isolates the output shaft 300 from the assembly gap between the mounting hole 222 through the sealing assembly 100. This reduces the risk of foreign objects entering the accommodating cavity 221 from the assembly gap, and also reduces the risk of oil leakage from the accommodating cavity 221 to the outside from the assembly gap.

[0026] In some implementations, refer to Figure 2 As shown, the output shaft 300 is connected to the electric drive unit through the differential assembly 210. The solid shaft portion 310 of the output shaft 300 is connected to the differential 211, and the hollow shaft portion 320 extends to the mounting hole 222. This design can reduce the influence of the size of the differential 211 on the hollow shaft portion 320, and can appropriately thicken the wall thickness of the hollow shaft portion 320 to withstand greater torque output and maintain synchronous torque output with the external drive shaft.

[0027] In some implementations, refer to Figure 2 As shown, the differential assembly 210 includes a differential 211 and a second housing 212. The differential 211 is housed within the second housing 212, and a solid half-shaft passes through the second housing 212 to connect to the differential 211. A cavity is formed inside the second housing 212 to house the gears of the differential 211, and the second housing 212 is filled with lubricating fluid for lubrication and cooling between the gears. The solid half-shaft passing through the second housing 212 isolates the second housing 212 from the housing cavity 221, reducing the risk of fluid flowing between the differential assembly 210 and the housing cavity 221 and the second housing 212 from the assembly gap. It also reduces the risk of foreign objects entering the second housing 212 through the assembly gap between the output shaft 300 and the external drive shaft.

[0028] In some implementations, refer to Figure 2 As shown, the second housing 212 includes a first housing portion 2121 and a second housing portion 2122. The first housing portion 2121 forms a chamber for accommodating the differential 211, and the second housing portion 2122 forms an output shaft 300 mounting hole. The second housing portion 2122 extends from the first housing portion 2121 toward the mounting hole 222. The second housing portion 2122 is configured as a circular housing passing through the mounting hole 222. Part of the solid shaft portion 310 and all of the hollow shaft portion 320 are provided in the output shaft 300 mounting hole. The output shaft 300 is isolated from the accommodating cavity 221 by the second housing 212. This design can further increase the isolation performance between the first housing 220 and the second housing 212.

[0029] In some implementations, refer to Figure 2 As shown, the differential 211 includes a planetary gear set, a planetary carrier, and half-shaft gears 2111. The planetary gears in the planetary gear set are rotatably mounted on the planetary carrier. The half-shaft gears 2111 mesh with the planetary gears and are respectively connected to the solid half-shafts and the solid shaft portion 310 of the output shaft 300. When the vehicle is traveling straight, the planetary gears only revolve with the planetary carrier, and the two half-shaft gears 2111 rotate at the same speed, achieving uniform rotation of the wheels on both sides. However, when the vehicle is turning, the resistance on the inner wheel increases, the speed of the half-shaft gear 2111 decreases, and the planetary gears begin to rotate on their own axes while revolving around the planetary carrier, thereby increasing the speed of the outer half-shaft gear 2111. This satisfies the need for the wheels on both sides to rotate at different speeds, ensuring the smoothness of the vehicle during turning.

[0030] In some implementations, reference is made to Figure 3 As shown, the sealing assembly 100 includes a sealing element 110 and a first cover 120 forming a sealing structure, as shown in the figure. Figure 4 As shown, it also includes another sealing structure formed by the seal 110 and the second cover 130. (Refer to...) Figure 3 As shown, the sealing structure formed by the seal 110 and the first cover 120, by placing a portion of the first cover 120 between the seal 110 and the inner wall of the mounting hole 222, serves both a dustproof function and increases sealing performance. (Refer to...) Figure 4 As shown, the sealing structure formed by the seal 110 and the second cover 130 provides dust protection and reduces installation difficulty by snapping the second cover 130 onto the side of the seal 110 away from the receiving cavity 221. The seal 110, the first cover 120, and the second cover 130 are all annular structures.

[0031] In some implementations, refer to Figure 3 and Figure 4As shown, the seal 110 includes a first sealing part 111, a main body part 112, and a second sealing part 113 connected sequentially along the radial direction of the output shaft 300. The first sealing part 111 is disposed between the inner sidewall of the mounting hole 222 and the main body part 112, and the second sealing part 113 is disposed between the outer sidewall of the hollow shaft part 320 and the main body part 112. The first sealing part 111 fits tightly against the inner sidewall of the mounting hole 222, effectively preventing external dust and impurities from entering through the gap between the sidewall of the mounting hole 222 and the main body part 112. The second sealing part 113 forms a sealing fit with the outer sidewall of the hollow shaft part 320, further enhancing the sealing effect between the hollow shaft part 320 and the main body part 112. This design significantly improves the overall sealing performance of the drive system. Specifically, the seal 110 also includes a skeleton, which is a metal sheet that extends from the first sealing portion 111 to the main body 112 and further to the second sealing portion 113; alternatively, the skeleton can also extend from the second sealing portion 113 to the main body 112 and further to the first sealing portion 111. During the manufacturing process of the seal 110, the skeleton and the sealing portion are formed integrally through injection molding, with the sealing material covering the skeleton. This maintains the structural strength of the seal 110 while also achieving a good sealing effect. The skeleton can be configured in various shapes according to actual needs, and the material of the seal 110 includes at least one of rubber and plastic.

[0032] In some implementations, refer to Figure 3 As shown, in a sealing structure, a sealing element 110 can be connected to a first cover 120. The first cover 120 includes a first cover plate 121 and a second cover plate 122 arranged at an angle. The first cover plate 121 abuts against the outer wall of the second sealing part 113 and the hollow shaft part 320. The second cover plate 122 is located on the side of the second sealing part 113 away from the receiving cavity 221. The first cover plate 121, located between the second sealing part 113 and the hollow shaft part 320, can increase the sealing performance and reduce the risk of the first cover 120 falling off. The second cover plate 122, located on the side of the second sealing part 113 away from the receiving cavity 221, can play a dustproof role. Because the second cover plate 122 is located on the side of the second sealing part 113 away from the receiving cavity 221, the second cover plate 122 can fit more tightly against the second sealing part 113, achieving a better sealing effect.

[0033] In some implementations, refer to Figure 4As shown, in another sealing structure, the sealing element 110 can be connected to the second cover 130. The second cover 130 is located on the side of the sealing element 110 opposite to the receiving cavity 221, and the second cover 130 forms a mounting groove 131. The mounting groove 131 is engaged with a portion of the second sealing part 113. The mounting groove 131 is recessed towards the side opposite to the second sealing part 113, accommodating a portion of the second sealing part 113 structure within the mounting groove 131. Furthermore, the second mounting part and the mounting groove 131 can fit tightly together. The tighter the fit, the better the dustproof and anti-detachment effect; the looser the fit, the easier the installation. The specific degree of fit between the two is determined according to the actual situation.

[0034] In some implementations, refer to Figure 3 and Figure 4 As shown, the first sealing part 111 and the main body part 112 have internal skeletons, while the second sealing part 113 does not. This design results in lower structural strength for the second sealing part 113 compared to the first sealing part 111. When the seal 110 is installed, the fit between the first sealing part 111 and the mounting hole 222 is tighter, while the fit between the second sealing part 113 and the hollow shaft part 320 is relatively loose. This design facilitates the installation of the seal 110. However, to increase the sealing performance of the seal 110, multiple sealing lips are provided in the second sealing part 113 since it lacks an internal skeleton. Further, refer to... Figure 3 and Figure 4 As shown, the second sealing portion 113 includes a first sealing lip 1131, a second sealing lip 1132, and a third sealing lip 1133 connected to the main body portion 112. The first sealing lip 1131 extends towards the side close to the receiving cavity 221, while the second sealing lip 1132 and the third sealing lip 1133 extend away from the receiving cavity 221. The first sealing lip 1131, the second sealing lip 1132, and the third sealing lip 1133 are all in close contact with the outer wall of the hollow shaft portion 320, forming multiple sealing barriers. Specifically, the first sealing lip 1131, extending towards the receiving cavity 221, effectively prevents lubricating oil in the receiving cavity 221 from leaking towards the mounting hole 222; the second sealing lip 1132 and the third sealing lip 1133, extending away from the receiving cavity 221, can intercept foreign objects and impurities from the outside layer by layer, preventing them from entering the receiving cavity 221. This multi-lip design not only enhances the sealing effect but also ensures that even when some sealing lips wear or age, others can still maintain a certain level of sealing performance, thereby extending the overall service life of the sealing assembly 100. Simultaneously, the sealing lips are made of an elastic material, allowing them to fit tightly against the outer wall of the hollow shaft portion 320 during assembly through their own elastic deformation. This ensures stable and reliable sealing performance even when the output shaft 300 rotates at high speed, preventing seal failure due to vibration or eccentricity.

[0035] In some implementations, refer to Figure 3 and Figure 4 As shown, multiple first sealing lips 1131, second sealing lips 1132, and third sealing lips 1133 can be configured to increase the sealing effect. Specifically, there is one first sealing lip 1131, one or two second sealing lips 1132, and one third sealing lip 1133.

[0036] In some implementations, refer to Figure 3 and Figure 4 As shown, the third sealing lip 1133 is disposed on the outer side of the second sealing lip 1132 in the radial direction of the output shaft 300. The third sealing lip 1133 is inclined from the outer wall of the hollow shaft portion 320 toward the inner wall of the mounting hole 222 on the side of the second sealing portion 113 away from the accommodating cavity 221. The second sealing lip 1132 is inclined from the inner wall of the mounting hole 222 toward the outer wall of the hollow shaft portion 320 on the side of the second sealing portion 113 away from the accommodating cavity 221, so that the second sealing lip 1132 and the third sealing lip 1133 form a similar "figure-eight" structure. When the first cover 120 and the second cover 130 are inserted into the second sealing portion 113, at least one of the third sealing lip 1133 and the second sealing lip 1132 can be inserted into the first cover 120 and the second cover 130 to increase the dustproof effect.

[0037] In some implementations, refer to Figure 3 As shown, the first sealing part 111 includes a limiting part 1111, and a limiting hole 2221 is formed on the inner sidewall of the mounting hole 222. The limiting part 1111 is engaged in the limiting hole 2221. The matching arrangement of the limiting part 1111 and the limiting hole 2221 prevents the first sealing part 111 from falling out of the mounting hole 222. The limiting part 1111 of the first sealing part 111 is located on the side away from the receiving cavity 221. When the first sealing part 111 is installed between the inner sidewall of the mounting hole 222 and the inner sidewall of the hollow shaft, the limiting part 1111 will be engaged in the limiting hole 2221, which can prevent the second sealing part 113 from being excessively pressed into one side of the receiving cavity 221, and the risk of the sealing member 110 falling off can also be reduced in subsequent use. Regardless of whether the sealing assembly 100 adopts a sealing structure of sealing element 110 and first cover 120 or a sealing structure of sealing element 110 and second cover 130, the limiting part 1111 can also be provided on the first cover 120 and the second cover 130, so that the first cover 120 and the second cover 130 respectively achieve limiting cooperation with the inner sidewall of the mounting hole 222.

[0038] In some implementations, refer to Figure 5 and Figure 6As shown, the drive system includes a reducer 400 and a rotating component 500. The reducer 400 is located in the accommodating cavity 221 and connected to the differential assembly 210. The rotating component 500 is located between the outer wall of the hollow shaft portion 320 and the inner wall of the mounting hole 222. The sealing assembly 100 is located on the side of the rotating component 500 away from the reducer 400. The rotating component 500 can be a bearing. The inner ring of the bearing is connected to the outer wall of the hollow shaft portion 320, and the outer ring is connected to the inner wall of the mounting hole 222 to achieve stable support for the output shaft 300, enabling the output shaft 300 to rotate with the mounting hole 222 and reducing the radial runout of the output shaft 300 during rotation. The sealing assembly 100 is located on the side of the bearing away from the reducer 400. It prevents debris or external dust generated during bearing operation from entering the receiving cavity 221 through the gap between the bearing and the mounting hole 222 and the hollow shaft portion 320. It also prevents lubricating oil in the receiving cavity 221 from seeping into the bearing through this gap, thus affecting the bearing's normal lubrication and service life. Furthermore, the bearing and sealing assembly 100 are arranged sequentially along the axial direction of the output shaft 300. The bearing provides rotational support for the output shaft 300, while the sealing assembly 100 provides sealing protection, jointly ensuring the stable operation of the drive system.

[0039] In some implementations, combined Figure 2 As shown, when the second housing portion 2122 of the second housing 212 is inserted into the mounting hole 222, the rotating member 500 can be disposed between the outer side wall of the second housing portion 2122 and the inner side wall of the mounting hole 222. Simultaneously, a rotating member 500 is disposed between the output shaft 300 and the second housing portion 2122, causing the output shaft 300 to rotate relative to the second housing portion 2122, and the second housing portion 2122 to rotate relative to the mounting hole 222. The rotating member 500 can be selected from either a deep groove ball bearing or a needle roller bearing. This design enables smooth rotation of both components, improves the smoothness of rotation between them, and reduces the overall operating noise and wear.

[0040] In some implementations, refer to Figure 5As shown, the drive device 200 also includes a motor 600 disposed in the accommodating cavity 221. The motor 600 is connected to the reducer 400 and protrudes to one side of the second housing 212. The mounting hole 222 includes a first mounting hole 2222 located near the motor 600 and a second mounting hole 2223 located near the reducer 400. The output shaft 300 includes a first half-shaft 301 and a second half-shaft 302. The length of the first half-shaft 301 is greater than the length of the second half-shaft 302. The first half-shaft 301 is connected to the differential assembly 210 and extends toward the first mounting hole 2222. The second half-shaft 302 is connected to the differential assembly 210 and extends toward the second mounting hole 2223. A sealing assembly 100 is disposed between the outer side wall of the first half-shaft 301 and the inner side wall of the first mounting hole 2222, and a sealing assembly 100 is disposed between the outer side wall of the second half-shaft 302 and the inner side wall of the second mounting hole 2223. The motor 600 serves as the power source for the drive system. Its output end is connected to the input end of the reducer 400, transmitting power to the reducer 400 for speed reduction and torque amplification. The reducer 400 then drives the differential assembly 210. The first mounting hole 2222 and the second mounting hole 2223 on the first housing 220 are respectively connected to the first half-shaft 301 and the second half-shaft 302. Since the motor 600 protrudes to one side of the second housing 212, the first housing 220 also extends in the corresponding protruding direction to protect the motor 600 and accommodate it internally. However, this design results in a greater distance between the edge of the housing on one side of the motor 600 and the second housing 212 than the distance between the edge of the housing on one side of the reducer 400 and the second housing 212. Setting the length of the first half-shaft 301 to be greater than the length of the second half-shaft 302 allows for the assembly of the first half-shaft 301, the first housing 220, and the second housing 212, as well as the assembly of the second half-shaft 302, the first housing 220, and the second housing 212.

[0041] In some implementations, refer to Figure 5 As shown, the vehicle includes left and right wheels, which are respectively connected to the output shaft 300 via external drive shafts. To ensure the sealing effect of the drive system, the first half-shaft 301 is made longer than the second half-shaft 302 to achieve a stable connection with the external drive shaft. Correspondingly, a sealing component 100 needs to be provided between the first half-shaft 301 and the first mounting hole 2222, and a similar sealing component 100 needs to be provided between the second half-shaft 302 and the second mounting hole 2223. Furthermore, both the first half-shaft 301 and the second half-shaft 302 need to be configured as a combination structure of a solid shaft portion 310 and a hollow shaft portion 320 to achieve a better sealing effect.

[0042] In some implementations, refer to Figure 5 and Figure 6As shown, the differential 211 includes a half-shaft gear 2111. A first spline 311 is formed on the radially outer side of the solid shaft portion 310, and the first spline 311 meshes with the half-shaft gear 2111. A mating hole 321 is formed in the hollow shaft portion 320, and a second spline 3211 is formed inside the mating hole 321. The mating hole 321 is used for inserting an external drive shaft, and the second spline 3211 is used for meshing with the external drive shaft. The meshing method between the first spline 311 and the half-shaft gear 2111 is involute spline meshing, which has the characteristics of high load-bearing capacity, high transmission accuracy, and long service life, and can ensure the stability and reliability of power transmission between the solid shaft portion 310 and the differential 211. The inner diameter of the mating hole 321 is designed to match the outer diameter of the external drive shaft. The tooth profile parameters of the second spline 3211 are matched with the spline parameters of the external drive shaft. The spline connection enables circumferential fixation and torque transmission between the external drive shaft and the hollow shaft portion 320, while allowing a certain relative displacement between the two in the axial direction to accommodate suspension bounce and installation errors during vehicle operation. When the external drive shaft is inserted into the mating hole 321, the second spline 3211 can quickly transmit power and effectively prevent slippage between the external drive shaft and the hollow shaft portion 320 during vehicle acceleration, deceleration, or turning, ensuring the power output efficiency of the drive system.

[0043] In some implementations, refer to Figure 5 and Figure 6 As shown, the first half-shaft 301 is also equipped with a disconnection mechanism. This mechanism can disconnect and couple the solid shaft portion 310 and the hollow shaft portion 320 of the first half-shaft 301, automatically switching the power transmission state according to the vehicle's driving conditions. When the vehicle is traveling in a straight line and no additional power distribution is required, the disconnection mechanism couples the solid shaft portion 310 and the hollow shaft portion 320, ensuring smooth power transmission from the differential assembly 210 to the external drive shaft. When the vehicle is turning or under specific road conditions requiring reduced energy consumption, the disconnection mechanism can disconnect the two, allowing the hollow shaft portion 320 to rotate freely with the external drive shaft, while the solid shaft portion 310 stops power output, thereby reducing mechanical losses in the drive system and improving the vehicle's fuel economy or range. Specifically, the disconnection mechanism includes an axially movable dog-tooth clutch device to achieve the engagement and disengagement of the first half-shaft.

[0044] In this application, the drive unit 200 includes a motor 600, a reducer 400, and a differential assembly 210. The motor 600 is connected to the reducer 400, and the reducer 400 is connected to the differential 211. The first housing 220 forms a receiving cavity 221 and a mounting hole 222. The output shaft 300 includes a solid shaft portion 310 and a hollow shaft portion 320. A sealing assembly 100 is disposed between the hollow shaft portion 320 and the mounting hole 222 to prevent dust and oil leakage. The second housing 212 isolates the output shaft 300 from the receiving cavity 221 through the first housing portion 2121 and the second housing portion 2122. The sealing assembly 100 further seals the gap between the mounting hole 222 and the hollow shaft portion 320, reducing the risk of external dust entering or internal oil leakage. The output shaft 300 is divided into a first half-shaft 301 and a second half-shaft 302. The length is adapted to the housing extension structure to ensure a stable connection with the external drive shaft. Both half-shafts adopt a combination structure of solid shaft part 310 and hollow shaft part 320 to improve the sealing effect.

[0045] This application also provides a vehicle including the aforementioned drive system.

[0046] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A drive system, characterized in that, include: Sealing components; The drive unit includes a differential assembly and a first housing, the first housing forming a receiving cavity and a mounting hole; The output shaft includes a solid shaft portion and a hollow shaft portion. The solid shaft portion is connected to the differential assembly. The hollow shaft portion is connected to the solid shaft portion and extends toward the mounting hole. The hollow shaft portion is used to connect an external drive shaft. The sealing assembly is disposed between the outer side wall of the hollow shaft portion and the inner side wall of the mounting hole.

2. The drive system according to claim 1, characterized in that, The differential assembly includes a differential and a second housing, the differential being housed within the second housing, and the solid shaft portion passing through the second housing and connected to the differential.

3. The drive system according to claim 1, characterized in that, The sealing assembly includes: The sealing element includes a first sealing part, a main body part, and a second sealing part connected sequentially along the radial direction of the output shaft. The first sealing part is disposed between the inner sidewall of the mounting hole and the main body part, and the second sealing part is disposed between the outer sidewall of the hollow shaft part and the main body part. The first cover includes a first cover plate and a second cover plate arranged at an angle. The first cover plate abuts against the outer wall of the second sealing part and the hollow shaft part, and the second cover plate is disposed on the side of the second sealing part away from the accommodating cavity.

4. The drive system according to claim 1, characterized in that, The sealing assembly includes: The sealing element includes a first sealing part, a main body part, and a second sealing part connected sequentially along the radial direction of the output shaft. The first sealing part is disposed between the inner sidewall of the mounting hole and the main body part, and the second sealing part is disposed between the outer sidewall of the hollow shaft part and the main body part. A second cover is disposed on the side of the seal opposite to the receiving cavity, and the second cover forms a mounting groove that engages with a portion of the second seal.

5. The drive system according to claim 3 or 4, characterized in that, The second sealing portion includes a first sealing lip, a second sealing lip, and a third sealing lip connected to the main body portion. The first sealing lip extends toward the side close to the receiving cavity, and the second and third sealing lips extend toward the side away from the receiving cavity.

6. The drive system according to claim 3 or 4, characterized in that, The first sealing part includes a limiting part, and the inner sidewall of the mounting hole forms a limiting hole, and the limiting part is engaged in the limiting hole.

7. The drive system according to claim 2, characterized in that, The drive system includes a reducer and a rotating component. The reducer is located in the accommodating cavity and connected to the differential assembly. The rotating component is located between the outer wall of the hollow shaft and the inner wall of the mounting hole. The sealing assembly is located on the side of the rotating component away from the reducer.

8. The drive system according to claim 7, characterized in that, The driving device also includes a motor disposed in the accommodating cavity. The motor is connected to the reducer and protrudes to one side of the second housing. The mounting hole includes a first mounting hole located near the motor and a second mounting hole located near the reducer. The output shaft includes a first half-shaft and a second half-shaft. The length of the first half-shaft is greater than the length of the second half-shaft. The first half-shaft is connected to the differential assembly and extends toward the first mounting hole. The second half-shaft is connected to the differential assembly and extends toward the second mounting hole. The sealing assembly is disposed between the outer side wall of the first half-shaft and the inner side wall of the first mounting hole, and the sealing assembly is disposed between the outer side wall of the second half-shaft and the inner side wall of the second mounting hole.

9. The drive system according to claim 2, characterized in that, The differential includes a half-shaft gear, and a first spline is formed on the radially outer side of the solid shaft portion, the first spline meshing with the half-shaft gear; The hollow shaft portion forms a mating hole, and a second spline is formed inside the mating hole. The mating hole is used for inserting the external drive shaft, and the second spline is used for meshing with the external drive shaft.

10. A vehicle, characterized in that, Includes the drive system as described in any one of claims 1 to 9.

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