Power transmission system and vehicle with same

Abstract

The embodiment of the invention provides a power transmission system and a vehicle with the same, and relates to the technical field of power transmission. The power transmission system comprises an output shaft, wherein one end of the output shaft is connected with the output end of the gearbox; the driving shaft is connected with the output shaft, the driving shaft is provided with a connecting cavity with an opening in one end, and at least part of the other end of the output shaft extends into the connecting cavity and is connected with the inner wall of the connecting cavity; the sealing assembly at least comprises an anti-corrosion sealing piece and an oil sealing piece, the anti-corrosion sealing piece is connected with the driving shaft and arranged on the outer surface of the driving shaft, one end of the oil sealing piece is connected with the anti-corrosion sealing piece, and the other end of the oil sealing piece is connected with a shell of the gearbox. According to the scheme, the technical problem that in the prior art, sealing failure is caused after a driving shaft is rusted in a wading mode is at least solved.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, and more specifically, to a power transmission system and a vehicle having the same. Background Technology

[0002] Current research on water-sealing technology for automotive transmission systems focuses on optimizing matching structures and innovating oil seal materials. At the structural design level, existing technologies employ a double-lip structure combined with a spring-assisted pressurized oil seal design. This multi-lip synergy enhances dynamic sealing reliability. Spiral guide grooves are machined on the drive shaft surface to accelerate drainage using centrifugal force, effectively reducing water accumulation. Furthermore, increasing the interference fit between the oil seal side lip and the axial surface of the drive shaft extends the sealing contact layer and path.

[0003] However, existing technologies have failed to fundamentally solve the related sealing failures and power system problems caused by the corrosion of the drive shaft body after water immersion. They also require increased maintenance frequency and high cost per repair, which cannot meet the market's long-term and frequent demand for water immersion scenarios and limit the user's enjoyment of water immersion.

[0004] There is currently no good solution to the above problems. Summary of the Invention

[0005] This application provides a power transmission system and a vehicle having the same, to at least solve the technical problem in the prior art where the drive shaft fails to seal after erosion by water.

[0006] According to one aspect of the embodiments of this application, a power transmission system is provided, comprising: an output shaft, one end of which is connected to the output end of a gearbox; a drive shaft, which is connected to the output shaft and has a connecting cavity with one open end, wherein at least a portion of the other end of the output shaft extends into the connecting cavity and is connected to the inner wall of the connecting cavity; and a sealing assembly, which includes at least a corrosion-resistant seal and an oil seal, wherein the corrosion-resistant seal is connected to the drive shaft and disposed on the outer surface of the drive shaft, one end of the oil seal is connected to the corrosion-resistant seal, and the other end of the oil seal is connected to the housing of the gearbox.

[0007] Furthermore, along the axial direction of the drive shaft, the outer surface of the drive shaft is formed with multiple stepped surfaces, which extend circumferentially along the drive shaft. The distance between each stepped surface and the central axis of the drive shaft is not equal. The anti-corrosion seal is disposed on at least one stepped surface, and the anti-corrosion seal is connected to the inner lip of the oil seal.

[0008] Furthermore, the sealing assembly also includes a dustproof component, one end of which is connected to the stepped surface, and the other end of which is connected to the oil seal.

[0009] Furthermore, the power transmission system also includes a limiting component, which includes a limiting structure and a mating structure. The limiting structure is disposed on either the inner surface of the drive shaft or the outer surface of the output shaft, and the mating structure is disposed on the other of the inner surface of the drive shaft or the outer surface of the output shaft. The limiting structure and the mating structure are connected to each other to limit the radial relative movement between the output shaft and the drive shaft.

[0010] Furthermore, the limiting structure is one of the protrusion structure and the groove structure, and the mating structure is the other of the protrusion structure and the groove structure. When the limiting structure and the mating structure are connected, the protrusion structure extends into the groove structure.

[0011] Furthermore, an internal spline is provided on the inner wall of at least part of the connecting cavity, and an external spline is provided on the outer surface of at least part of the output shaft. The drive shaft and the output shaft are connected by a spline, and when the output shaft and the drive shaft are connected, the internal spline and the external spline correspond to each other.

[0012] Furthermore, the internal spline includes a first internal spline and a second internal spline, and the external spline includes a first external spline and a second external spline. The first internal spline is disposed on the side wall of the connecting cavity and on one side of the limiting component. The first external spline is disposed on the outer peripheral surface of the output shaft and on one side of the limiting component. The first internal spline and the first external spline are disposed opposite to each other. The second internal spline is disposed on the bottom wall of the connecting cavity, and the second external spline is disposed on the end face of the output shaft facing the drive shaft. The second internal spline and the second external spline are disposed opposite to each other.

[0013] Furthermore, the sealing assembly also includes a first seal, which is disposed on the outer peripheral surface of the output shaft along the circumferential direction of the output shaft and is disposed between the limiting assembly and the first external spline.

[0014] Furthermore, the sealing assembly also includes a second seal, which is disposed on the outer peripheral surface of the output shaft along the circumferential direction of the output shaft and is located between the first external spline and the second external spline.

[0015] According to another aspect of the embodiments of this application, a vehicle is also provided, the vehicle having a power transmission system, the power transmission system being the aforementioned power transmission system.

[0016] In this embodiment, a connecting cavity is provided at the end of the drive shaft facing the output shaft. When the output shaft is connected to the drive shaft, the output shaft extends into the connecting cavity. At this time, the outer wall of the connecting cavity can form a barrier that seals the connection between the output shaft and the drive shaft. Since the output shaft and drive shaft of the power transmission system are in a water-exposed working environment, an additional sealing component is provided. The sealing component includes an oil seal and an anti-corrosion seal. The anti-corrosion seal is connected to the oil seal and is disposed between the gearbox housing and the outer surface of the drive shaft. The anti-corrosion seal can increase permanent anti-corrosion and wear resistance, thereby improving performance and achieving the performance of long-term water immersion without rust and wear resistance of the drive shaft itself, actively improving the life of the transmission system and meeting the requirements of long-term water immersion conditions of the transmission system. It can completely eliminate the driver's concerns about various water immersion conditions. The corresponding maintenance frequency and maintenance cost can even be lower than the maintenance frequency and maintenance cost of the prior art in non-water immersion conditions, and can permanently avoid the adverse problems caused by drive shaft corrosion after water immersion. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of an optional power transmission system according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of an optional power transmission system according to an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of an optional power transmission system according to an embodiment of this application.

[0021] The above figures include the following reference numerals:

[0022] 10. Output shaft;

[0023] 20. Drive shaft; 200. Connecting cavity;

[0024] 30. Sealing assembly; 31. Corrosion-resistant seal; 32. Oil seal; 33. Dustproof component; 34. First seal; 35. Second seal;

[0025] 40. Gearbox; 41. Housing;

[0026] 50. Limiting components. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. 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 apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] like Figures 1 to 3 As shown, according to an embodiment of this application, a power transmission system is provided.

[0030] Specifically, such as Figure 1 , Figure 2 As shown, the power transmission system includes an output shaft 10, a drive shaft 20, and a sealing assembly 30. One end of the output shaft 10 is connected to the output end of the gearbox 40. The drive shaft 20 is connected to the output shaft 10 and has a connecting cavity 200 with one end open. At least a portion of the other end of the output shaft 10 extends into the connecting cavity 200 and is connected to the inner wall of the connecting cavity 200. The sealing assembly 30 includes at least a corrosion-resistant seal 31 and an oil seal 32. The corrosion-resistant seal 31 is connected to the drive shaft 20 and is disposed on the outer surface of the drive shaft 20. One end of the oil seal 32 is connected to the corrosion-resistant seal 31, and the other end of the oil seal 32 is connected to the housing 41 of the gearbox 40.

[0031] Applying the technical solution of this embodiment, a connecting cavity 200 is provided at one end of the drive shaft 20 facing the output shaft 10. When the output shaft 10 is connected to the drive shaft 20, the output shaft 10 extends into the connecting cavity 200. At this time, the outer wall of the connecting cavity 200 can form a barrier that seals the connection between the output shaft 10 and the drive shaft 20. Since the output shaft 10 and the drive shaft 20 of the power transmission system are in an external water-immersed working environment, an additional sealing component 30 is provided. The sealing component 30 includes an oil seal 32 and an anti-corrosion seal 31. The anti-corrosion seal 31 and the oil seal 32 are connected and disposed between the housing 41 of the gearbox 40 and the outer surface of the drive shaft 20. The anti-corrosion seal 31 can increase the permanent anti-corrosion and wear-resistant function, thereby improving the performance and realizing the long-term water immersion non-rust and wear-resistant performance of the drive shaft 20 itself, actively improving the life of the transmission system and meeting the requirements of the transmission system for long-term water immersion conditions. It can completely eliminate drivers' concerns about various water wading situations. The corresponding maintenance frequency and cost can even be lower than the maintenance frequency and cost of existing technologies in non-water wading conditions. It can permanently avoid the problems caused by drive shaft corrosion after water wading.

[0032] In one exemplary embodiment of this application, the anti-corrosion seal 31 is made of anti-corrosion material. The anti-corrosion seal 31 is an anti-corrosion and wear-resistant bushing structure, or the anti-corrosion seal 31 is a coating layer of anti-corrosion and wear-resistant material. The coating layer is applied to the outer surface of the drive shaft 20, and the oil seal 32 abuts against the anti-corrosion and wear-resistant bushing or coating layer to achieve sealing of the internal working environment of the power transmission system and the output shaft 10.

[0033] Specifically, such as Figure 1 As shown, along the axial direction of the drive shaft 20, the outer surface of the drive shaft 20 has multiple stepped surfaces. These stepped surfaces extend circumferentially along the drive shaft 20, and the distances between each stepped surface and the central axis of the drive shaft 20 are unequal. An anti-corrosion seal 31 is disposed on at least one stepped surface and is connected to the inner lip of the oil seal 32. The outer surface of the drive shaft 20 is designed with multiple stepped surfaces, and the distances between these stepped surfaces and the central axis of the drive shaft 20 are unequal, forming a stepped shaft structure. The anti-corrosion seal 31 can be disposed on any stepped surface according to the specific structure and dimensions of different output shafts 10 and gearbox housings 41 to achieve the best sealing effect.

[0034] In this embodiment, the location and extension length of the anti-corrosion seal 31 along the stepped surface can be determined based on the axial movement range of the drive shaft 20 and the lip size of the oil seal 32, ensuring that the inner lip of the oil seal 32 is in close contact with the anti-corrosion seal 31 to form a sealing cross section. Through the structural design of this embodiment, the anti-corrosion seal 31 is tightly integrated with the stepped surface of the drive shaft 20, improving the corrosion resistance and wear resistance of the entire drive shaft 20 and output shaft 10 under water immersion conditions. It also optimizes the sealing effect of the oil seal 32, enabling the drive shaft 20 to maintain reliability under long-term and frequent water immersion conditions, and greatly reducing maintenance costs.

[0035] Furthermore, the sealing assembly 30 also includes a dustproof component 33, one end of which is connected to the stepped surface, and the other end of which is connected to the oil seal 32. By adding a dustproof component 33 on the outside of the oil seal 32 and the anti-corrosion seal 31, a dual protection mechanism is formed. The dustproof component 33 can effectively isolate external dust, sand, and other impurities. At the same time, both ends of the dustproof component 33 are fixed to the stepped surface and the oil seal 32 respectively by embedded connection or press fit, which is stable and reliable and can effectively prevent the dustproof component 33 from falling off or deforming in harsh environments. When the drive shaft 20 is running in a water-filled environment, the dustproof component 33 can first block external sand and mud, reducing the direct impact on the oil seal 32, thereby reducing the wear of the oil seal 32 and extending its service life.

[0036] In one embodiment of this application, the dustproof component 33 may also be configured to have a certain elastic recovery capability. After being subjected to external impact or compression, it can automatically recover to a certain extent and maintain a sealed state. This allows the dustproof component 33 to maintain good sealing performance even after experiencing complex working conditions, ensuring the safe operation of the drive shaft 20 and the output shaft 10, improving the overall protection level of the sealing assembly 30, and indirectly enhancing the working stability of the anti-corrosion seal 31 and the oil seal 32.

[0037] Furthermore, the power transmission system also includes a limiting component 50, which includes a limiting structure and a mating structure. The limiting structure is disposed on either the inner surface of the drive shaft 20 or the outer surface of the output shaft 10, and the mating structure is disposed on the other of the inner surface of the drive shaft 20 or the outer surface of the output shaft 10. The limiting structure and the mating structure are connected to each other to limit the radial relative movement between the output shaft 10 and the drive shaft 20. By providing mutually mating limiting structures and mating structures on the inner surface of the drive shaft 20 and the outer surface of the output shaft 10, the radial relative movement between the output shaft 10 and the drive shaft 20 can be limited through the cooperation of the limiting structure and the mating structure. During vehicle operation, under wading conditions, the pressure and impact of water may cause radial displacement of the shaft. This displacement may damage the original sealing structure, leading to water leakage or grease leakage. By using the limiting component 50, the structural stability of the entire sealing assembly 30 can be improved, and the misalignment or wear of the oil seal 32 caused by radial force can be prevented, thereby ensuring the durability of the sealing effect.

[0038] It should be noted that the limiting component 50 also indirectly reduces the power loss and noise caused by inter-axle displacement, improving the vehicle's driving comfort and power efficiency.

[0039] Specifically, the limiting structure is one of a protruding structure and a groove structure, and the mating structure is the other of a protruding structure and a groove structure. When the limiting structure and the mating structure are connected, the protruding structure extends into the groove structure. The limiting component 50 utilizes the mating principle of the protruding structure and the groove structure to achieve radial limiting between the output shaft 10 and the drive shaft 20. When the protruding structure and the groove structure are connected, the protruding structure extends into the groove structure, forming a mechanical locking effect, effectively limiting the radial relative movement between the two shafts.

[0040] Optionally, the protruding structure and the limiting structure can be structures such as flanges, shoulders, keys, splines, grooves, slotted keys, spline grooves, etc., and the limiting effect can be achieved through spline connection and slotted key connection.

[0041] In one exemplary embodiment of this application, the limiting component 50 is an assembly centering stop. When the output shaft 10 and the drive shaft 20 are in high-speed rotational motion, the assembly centering stop can maintain the matching stability of the output shaft 10 and the drive shaft 20, reduce abnormal noise, and also reduce the movement fluctuation of the sealing component 30, ensuring a more stable operating environment for the sealing component 30, thereby improving the service life of the sealing component 30.

[0042] Furthermore, such as Figure 1As shown, at least a portion of the inner wall of the connecting cavity 200 is provided with an internal spline, and at least a portion of the outer surface of the output shaft 10 is provided with an external spline. The drive shaft 20 and the output shaft 10 are connected by a spline, with the internal spline corresponding to the external spline when the output shaft 10 and drive shaft 20 are connected. The spline connection between the drive shaft 20 and the output shaft 10 ensures efficient and stable power transmission between the two shafts, achieving precise axial and radial positioning. At least a portion of the inner wall of the connecting cavity 200 is provided with an internal spline structure, and the outer surface of the output shaft 10 is correspondingly provided with an external spline structure. When the output shaft 10 and drive shaft 20 are assembled, the external spline of the output shaft 10 is inserted into the internal spline of the drive shaft 200 connecting cavity, forming a spline connection. By using a spline connection, while ensuring efficient and stable power transmission, the stability and reliability of the connection between the output shaft 10 and drive shaft 20 are also improved.

[0043] Specifically, the internal spline includes a first internal spline and a second internal spline, and the external spline includes a first external spline and a second external spline. The first internal spline is disposed on the side wall of the connecting cavity 200 and on one side of the limiting component 50. The first external spline is disposed on the outer peripheral surface of the output shaft 10 and on one side of the limiting component 50. The first internal spline and the first external spline are disposed opposite to each other. The second internal spline is disposed on the bottom wall of the connecting cavity 200, and the second external spline is disposed on the end face of the output shaft 10 facing the drive shaft 20. The second internal spline and the second external spline are disposed opposite to each other. The first internal spline is located on the side wall of the connecting cavity 200, while the first external spline is located on the outer circumferential surface of the output shaft 10. The first internal and external splines provide initial axial and radial positioning, ensuring initial alignment of the output shaft 10 and the drive shaft 20 during assembly. The second internal spline is located on the bottom wall of the connecting cavity 200, while the second external spline is located on the end face of the output shaft 10 facing the drive shaft 20, opposite to the second internal spline, forming a deeply fitted connection. The second internal and external splines allow for a tighter connection between the output shaft 10 and the drive shaft 20, providing further radial positioning and axial limiting. The double spline configuration establishes a more robust and precise connection between the output shaft 10 and the drive shaft 20. This increases the contact area, reduces the load on individual keys, and further improves the efficiency of power transmission and the lifespan of the structure.

[0044] Furthermore, the sealing assembly 30 also includes a first seal 34, which is disposed circumferentially on the outer circumferential surface of the output shaft 10 and between the limiting assembly 50 and the first external spline. The first seal 34 is circumferentially disposed on the output shaft 10, tightly fitting against the outer circumferential surface of the output shaft 10, and located between the limiting assembly 50 and the first external spline. This allows the first seal 34 to form an additional sealing layer at the connection between the output shaft 10 and the drive shaft 20. Simultaneously, since the first seal 34 is disposed outside the first external spline, it provides a double-layer sealing environment at the connection between the first external spline and the first internal spline, preventing water or impurities from affecting the first internal and external splines, avoiding corrosion of the first internal and external splines, and preventing problems such as difficulty in disassembly and abnormal noise caused by corrosion.

[0045] Furthermore, the sealing assembly 30 also includes a second seal 35, which is disposed circumferentially on the outer circumferential surface of the output shaft 10 and between the first external spline and the second external spline. The second seal 35, directly disposed between the first and second external splines, together with the first seal 34 and the oil seal 32, forms a multi-layer sealing system. This further forms an additional sealing layer at the connection of the second internal and external splines, preventing water or impurities from affecting the second internal and external splines, avoiding corrosion of the second internal and external splines, and preventing problems such as difficulty in disassembly and abnormal noise caused by corrosion.

[0046] According to another specific embodiment of this application, a vehicle is provided, which has a power transmission system, the power transmission system described in the above embodiment. Integrating the power transmission system described in the above embodiment into the vehicle allows the vehicle to exhibit excellent adaptability and reliability in water-crossing scenarios. By setting the anti-corrosion seal 31, the drive shaft 20 can maintain its structural integrity and functional stability even after long-term water wading, effectively preventing rust. The tight connection between the oil seal 32, the anti-corrosion seal 31, and the gearbox 40 housing 41 ensures that the power transmission path is not affected even in harsh water-crossing environments, reducing maintenance needs and lowering subsequent costs for users.

[0047] This application also provides a preferred embodiment of a power transmission system. By actively and permanently adding corrosion-resistant and wear-resistant anti-corrosion seals 31, the system ensures the convenience, stability, and reliability of the structure without changing the original manufacturing and assembly of the drive shaft 20. It completely avoids rusting during the product lifecycle of the drive shaft. The aim is to achieve the same maintenance frequency and low-cost maintenance as traditional non-water-crossing conditions, without restricting users' freedom to choose water-crossing operations. This addresses the current situation where existing vehicles have few water-crossing times, short water-crossing durations, and troublesome post-water-crossing inspections and repairs, which are concerns for users. This greatly improves user satisfaction and enhances the brand image.

[0048] Specifically, the power transmission system includes components such as a drive shaft 20, an output shaft 10, an oil seal 32, a first seal 34, a second seal 35, bearings, snap rings, retaining rings, a dustproof component 33, a housing 41 of the gearbox 40, and an anti-corrosion seal 31. The power transmission system allows for control of the position of the anti-corrosion seal 31 while ensuring that the anti-corrosion seal 31 has permanent anti-corrosion and wear-resistant functions. The anti-corrosion seal 31 can be a bushing or a coating layer. It is achieved by pressing the bushing onto the drive shaft 20 or by molten adsorption of the coating layer onto the drive shaft 20, thereby realizing the anti-corrosion and wear-resistant functional layer of the drive shaft 20.

[0049] Its working principle is as follows:

[0050] The bearing is connected to the output shaft 10 as a whole via a snap ring, and then assembled with the housing 41 via a retaining ring. The oil seal 32 is then fixed to the housing 41 by an interference fit. The position of the oil seal 32 after assembly is controlled by its size relative to the end face of the output shaft 10. The first seal 34 is an O-ring, fixed within the O-ring groove on the output shaft 10. The second seal 35 is assembled within the connecting ring groove on the output shaft 10. The dustproof component 33 is interference-fitted onto the drive shaft 20 and connects with the second seal 35 via the connecting ring groove on the drive shaft 20. This completes the water-resistant seal between the drive shaft 20 and the output shaft 10. At this point, the lip on the oil seal 32 is in interference contact with the bushing or coating, jointly providing the traditional dustproof and waterproof sealing effect. Combined with the corrosion-resistant properties of the bushing and coating, this fundamentally solves the problem of rust on the drive shaft 20 after water immersion. The axial movement of the output shaft 10 relative to the housing 41 is limited by the retaining ring, and the axial movement of the drive shaft 20 relative to the output shaft 10 is controlled by the second seal 35. This ensures that the lip of the oil seal 32 always operates within the effective length area of ​​the bushing or coating, thus ensuring the effectiveness of the water-resistant sealing device of this patent. The dustproof component 33 prevents external sand and gravel particles from directly impacting the oil seal 32 and reduces the entry of sand and gravel particles. The dustproof component 33 has the same effect as the traditional sealing structure.

[0051] As can be seen from the above description, the power transmission system in the above embodiments has the following beneficial effects:

[0052] In the development and use of the vehicle model, this embodiment does not affect the existing manufacturing precision of the drive shaft 20 or the existing vehicle assembly process. Based on the drive shaft 20's own neutral salt spray requirement of more than 720 hours, it is equivalent to the drive shaft 20 meeting the requirements of all water-wading conditions throughout its lifespan. This can completely eliminate the driver's concerns about various water-wading situations. The corresponding maintenance frequency and cost can even be lower than the maintenance frequency and cost of existing technologies for non-water-wading conditions, and can permanently avoid the adverse problems caused by corrosion of the drive shaft 20 after water wading.

[0053] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0054] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0055] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A power transmission system, characterized in that, include: Output shaft (10), one end of which is connected to the output end of gearbox (40); A drive shaft (20) is connected to the output shaft (10). The drive shaft (20) has a connecting cavity (200) with one end open. At least a portion of the other end of the output shaft (10) extends into the connecting cavity (200) and is connected to the inner wall of the connecting cavity (200). A sealing assembly (30) includes at least a corrosion-resistant seal (31) and an oil seal (32). The corrosion-resistant seal (31) is connected to the drive shaft (20) and is disposed on the outer surface of the drive shaft (20). One end of the oil seal (32) is connected to the corrosion-resistant seal (31), and the other end of the oil seal (32) is connected to the housing (41) of the gearbox (40).

2. The power transmission system according to claim 1, characterized in that, Along the axial direction of the drive shaft (20), a plurality of stepped surfaces are formed on the outer surface of the drive shaft (20). The stepped surfaces extend circumferentially along the drive shaft (20). The distance between each stepped surface and the central axis of the drive shaft (20) is not equal. The anti-corrosion seal (31) is disposed on at least one of the stepped surfaces. The anti-corrosion seal (31) is connected to the inner lip of the oil seal (32).

3. The power transmission system according to claim 2, characterized in that, The sealing assembly (30) also includes a dustproof component (33), one end of which is connected to the stepped surface and the other end of which is connected to the oil seal (32).

4. The power transmission system according to any one of claims 1 to 3, characterized in that, The power transmission system further includes a limiting component (50), which includes a limiting structure and a mating structure. The limiting structure is disposed on either the inner surface of the drive shaft (20) or the outer surface of the output shaft (10), and the mating structure is disposed on the other of the inner surface of the drive shaft (20) or the outer surface of the output shaft (10). The limiting structure and the mating structure are connected to each other to restrict the radial relative movement between the output shaft (10) and the drive shaft (20).

5. The power transmission system according to claim 4, characterized in that, The limiting structure is one of the protrusion structure and the groove structure, and the mating structure is the other of the protrusion structure and the groove structure. When the limiting structure is connected to the mating structure, the protrusion structure extends into the groove structure.

6. The power transmission system according to claim 5, characterized in that, An internal spline is provided on the inner wall of at least a portion of the connecting cavity (200), and an external spline is provided on the outer surface of at least a portion of the output shaft (10). The drive shaft (20) and the output shaft (10) are connected by a spline. When the output shaft (10) and the drive shaft (20) are connected, the internal spline corresponds to the external spline.

7. The power transmission system according to claim 6, characterized in that, The internal spline includes a first internal spline and a second internal spline, and the external spline includes a first external spline and a second external spline. The first internal spline is disposed on the side wall of the connecting cavity (200) and on one side of the limiting component (50). The first external spline is disposed on the outer peripheral surface of the output shaft (10) and on one side of the limiting component (50). The first internal spline and the first external spline are disposed opposite to each other. The second internal spline is disposed on the bottom wall of the connecting cavity (200). The second external spline is disposed on the end face of the output shaft (10) facing the drive shaft (20). The second internal spline and the second external spline are disposed opposite to each other.

8. The power transmission system according to claim 7, characterized in that, The sealing assembly (30) further includes a first seal (34), which is disposed on the outer peripheral surface of the output shaft (10) along the circumferential direction of the output shaft (10) and is disposed between the limiting assembly (50) and the first external spline.

9. The power transmission system according to claim 8, characterized in that, The sealing assembly (30) further includes a second seal (35), which is disposed on the outer peripheral surface of the output shaft (10) along the circumferential direction of the output shaft (10) and is disposed between the first external spline and the second external spline.

10. A vehicle, characterized in that, The vehicle has a power transmission system, which is the power transmission system described in any one of claims 1-9.

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