Speed reducing mechanism and vehicle

Abstract

The invention relates to a speed reducing mechanism and a vehicle, the speed reducing mechanism is applied to the vehicle, the vehicle is provided with a steering knuckle and a wheel, the wheel is provided with a hub bearing, and the speed reducing mechanism comprises a shell integrated with the steering knuckle; and the planetary mechanism is arranged in the shell and connected with the hub bearing so as to change the rotating speed of the wheel. Therefore, the space occupied by the speed reducing mechanism and the steering knuckle can be reduced, the speed reducing mechanism can be conveniently arranged on the whole vehicle, meanwhile, the planetary mechanism of the speed reducing mechanism is connected with the hub bearing of the wheel, the space occupied by the speed reducing mechanism can be further reduced, and the space utilization rate of the whole vehicle is improved. The planetary mechanism is connected with the hub bearing, the rotating speed of the wheel can be changed through the planetary mechanism, the rotating speed of the wheel is related to the torque, and therefore the torque output by the wheel can meet the user requirement by changing the rotating speed of the wheel.

Description

Technical Field

[0001] This application relates to the field of deceleration technology, and in particular, to a deceleration mechanism and a vehicle. Background Art

[0002] In the related art, new energy vehicles are favored by the market and consumers due to their advantages such as fast response speed, large torque, and strong performance. With the increasing requirements of consumers for off-road capabilities, the requirements for the torque of the whole vehicle are also getting higher and higher. The wheel-end deceleration mechanism can greatly reduce the probability of vehicle breakdown caused by the failure of the drive shaft and improve the off-road performance of the vehicle. The commonly used wheel-end deceleration mechanism uses gear transmission to achieve deceleration and torque increase, so that the wheels generate greater driving force, thereby improving the off-road performance of the vehicle. However, the common wheel-end deceleration mechanism using gear transmission has problems such as complex structure and large occupied space. Summary of the Invention

[0003] The embodiments of this application provide a deceleration mechanism and a vehicle, reducing the volume of the deceleration mechanism to at least partially solve the above technical problems.

[0004] To achieve the above object, according to the first aspect of this application, a deceleration mechanism is provided, which is applied to a vehicle. The vehicle has a steering knuckle and a wheel, and the wheel has a hub bearing. The deceleration mechanism includes: A housing, integrally provided with the steering knuckle; A planetary mechanism, disposed in the housing and connected to the hub bearing to change the rotational speed of the wheel.

[0005] In some embodiments, the vehicle also has a drive shaft. The planetary mechanism includes: A sun gear shaft, connected to the drive shaft; A first bearing, disposed at one end of the sun gear shaft close to the drive shaft and between the sun gear shaft and the housing. The first bearing is configured to bear the load in the radial direction of the deceleration mechanism.

[0006] In some embodiments, the sun gear shaft has a connecting shaft, and the connecting shaft is in transmission connection with the drive shaft. The first bearing is sleeved on the connecting shaft.

[0007] In some embodiments, the drive shaft is sleeved with the connecting shaft, and the first bearing is sleeved on the sleeved section of the drive shaft and the connecting shaft.

[0008] In some embodiments, the drive shaft and the sun gear shaft are coaxially arranged.

[0009] In some embodiments, the planetary mechanism further includes a first connecting member, and the first connecting member is configured to connect the sun gear shaft and the drive shaft.

[0010] In some embodiments, the sun gear shaft further has a sun gear connected to one end of the connecting shaft. A first connecting hole is formed in the sun gear shaft and extends from the end face of the connecting shaft facing away from the sun gear to the end face of the sun gear facing away from the transmission shaft. A second connecting hole is formed in the end face of the end of the transmission shaft connected to the sun gear shaft. A first connecting member is disposed in the first connecting hole and the second connecting hole.

[0011] In some embodiments, the first connecting hole and the second connecting hole are coaxially arranged.

[0012] In some embodiments, the planetary mechanism further includes: A planetary gear meshing with the sun gear; A planet carrier connected to the planetary gear; A second bearing disposed between the end face of the sun gear and the planet carrier. The second bearing is configured to bear the load in the axial direction of the reduction mechanism.

[0013] In some embodiments, the planet carrier is configured to be connected to the hub bearing so that the reduction mechanism is supported by the hub bearing in its radial direction.

[0014] In some embodiments, in the axial direction of the transmission shaft, a first through hole is formed in the planet carrier. A first seal is disposed in the first through hole. A second seal is disposed between the transmission shaft and the housing. A third seal is disposed between the housing and the planet carrier. The first seal, the second seal, the third seal, the housing, the transmission shaft and the planet carrier define a sealed cavity so that the lubricating fluid flows in the sealed cavity to lubricate the planetary mechanism.

[0015] In some embodiments, the contact surface of the planet carrier and the second bearing is a first connection surface. A first oil guiding groove is formed in the first connection surface. The first oil guiding groove is configured to guide the lubricating fluid to the second bearing.

[0016] In some embodiments, the planetary mechanism further includes: A third bearing disposed between the surface of the planet carrier facing away from the sun gear and the housing. The third bearing is configured to bear the load in the axial direction of the transmission shaft.

[0017] In some embodiments, the planetary mechanism further includes: A fourth bearing disposed between the surface of the planet carrier facing away from the sun gear and the housing. The fourth bearing is configured to bear the load in the radial direction of the reduction mechanism.

[0018] In some embodiments, the planetary mechanism further includes: A pin shaft configured to connect the planet carrier and the planetary gear. An oil passage is formed in the pin shaft. The oil passage is configured to guide the lubricating fluid to the connection surface between the planetary gear and the planet carrier to lubricate the planetary gear and the planet carrier.

[0019] In some embodiments, the planetary mechanism further includes: a fifth bearing disposed between the planet gear and the pin shaft, and the fifth bearing is configured to bear the load in the radial direction of the reduction mechanism.

[0020] In some embodiments, one end of the oil passage extends to the connection surface between the pin shaft and the planet gear, and the other end extends to the end surface of the pin shaft close to the transmission shaft, and a first oil port is defined to enable the lubricating fluid to flow into the oil passage from the first oil port.

[0021] In some embodiments, the planetary mechanism further includes: an oil collecting structure disposed at the first oil port, and the oil collecting structure is configured to divert the lubricating fluid to the first oil port.

[0022] In some embodiments, the planetary mechanism further includes: a ring gear having an inner ring gear and an outer peripheral surface, the inner ring gear meshes with the planet gear, and the outer peripheral surface is connected to the housing.

[0023] According to a second aspect of the present application, a vehicle is provided, including the reduction mechanism as described above.

[0024] In the reduction mechanism of the embodiments of the present application, by integrating the housing of the reduction mechanism with the steering knuckle of the vehicle, the space occupied by the reduction mechanism and the steering knuckle is reduced, facilitating the layout of the reduction mechanism on the whole vehicle. At the same time, connecting the planetary mechanism of the reduction mechanism with the hub bearing of the wheel can further reduce the space occupied by the reduction mechanism and improve the space utilization rate of the whole vehicle. Moreover, the connection between the planetary mechanism of the present application and the hub bearing enables the rotation speed of the wheel to be changed through the planetary mechanism, and the rotation speed of the wheel is related to the torque. Therefore, the present application can make the torque output by the wheel meet the user's needs by changing the rotation speed of the wheel.

[0025] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings without creative efforts based on these drawings.

[0027] In order to more fully understand the present application and its beneficial effects, the following description will be made in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0028] Figure 1 is a cross-sectional view of a reduction mechanism provided by an embodiment of the present application; Figure 2 is Figure 1Schematic perspective view of the speed reduction mechanism therein; Figure 3 is Figure 1 Schematic view of the structure of the planet carrier of the speed reduction mechanism in; Figure 4 is Figure 1 Enlarged view of part A in, where the second seal is shown; Figure 5 is Figure 1 Enlarged view of part B in, where the second bearing, the third bearing and the third seal are shown.

[0029] Description of reference numerals: 110, knuckle; 120, hub bearing; 130, drive shaft; 10, speed reduction mechanism; 21, sun gear shaft; 211, connecting shaft; 212, sun gear; 22, first connecting member; 23, planet gear; 24, planet carrier; 241, first through hole; 242, first connection surface; 25, pin shaft; 251, oil passage; 252, first oil port; 253, oil collecting structure; 26, ring gear; 30, housing; 41, first bearing; 42, second bearing; 43, third bearing; 44, fifth bearing; 51, first seal; 52, second seal; 53, third seal. Detailed description of the preferred embodiments

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0031] According to the first aspect of the present application, a speed reduction mechanism 10 is provided. Please refer to Figures 1 to 3 , Figure 1 is a cross-sectional view of a speed reduction mechanism provided by an embodiment of the present application, Figure 2 is Figure 1 Schematic perspective view of the speed reduction mechanism in, Figure 3 is Figure 1 Schematic view of the structure of the planet carrier of the speed reduction mechanism in. The speed reduction mechanism 10 is applied to a vehicle. The vehicle has a knuckle 110 and a wheel. The wheel has a hub bearing 120. The speed reduction mechanism 10 includes: a housing 30, which is integrally provided with the knuckle 110; a planetary mechanism, which is arranged in the housing 30 and connected to the hub bearing 120 to change the rotational speed of the wheel.

[0032] The speed reduction mechanism 10 provided in the embodiments of the present application is applied to a vehicle, and the planetary mechanism of the speed reduction mechanism 10 is connected to the hub bearing 120 of the wheel, that is, the speed reduction mechanism 10 provided in the present application is arranged at the wheel end. In the embodiments of the present application, by integrating the housing 30 of the speed reduction mechanism 10 with the steering knuckle 110 of the vehicle, the space occupied by the speed reduction mechanism 10 and the steering knuckle 110 is reduced, which facilitates the layout of the speed reduction mechanism 10 on the whole vehicle. At the same time, connecting the planetary mechanism of the speed reduction mechanism 10 to the hub bearing 120 of the wheel can further reduce the space occupied by the speed reduction mechanism 10 and improve the space utilization rate of the whole vehicle. And the planetary mechanism of the present application is connected to the hub bearing 120, so that the rotation speed of the wheel can be changed through the planetary mechanism. Since the rotation speed of the wheel is related to the torque, the present application can make the torque output by the wheel meet the user's needs by changing the rotation speed of the wheel.

[0033] In some embodiments of the present application, the planetary mechanism is a planetary mechanism in the NGW form.

[0034] Please continue to refer to Figures 1 to 3 , in some embodiments of the present application, the vehicle further has a transmission shaft 130, and the planetary mechanism includes: a sun gear shaft 21 connected to the transmission shaft 130; a first bearing 41 arranged at one end of the sun gear shaft 21 close to the transmission shaft 130 and between the sun gear shaft 21 and the housing 30. The first bearing 41 is configured to bear the load in the radial direction of the speed reduction mechanism 10.

[0035] Adopting such a solution enables the first bearing 41 to bear the load in the radial direction of the speed reduction mechanism 10. Since the bearing itself has high structural strength and is not easily damaged, the possibility of damage to the speed reduction mechanism 10 is reduced, thereby improving the reliability of the speed reduction mechanism 10. In addition, the first bearing 41 arranged between the sun gear shaft 21 and the housing 30 can also prevent gear lubricating oil from leaking from the gap between the connecting shaft 211 and the housing 30, ensuring continuous lubrication of the rolling elements. At the same time, it can also block harmful substances such as dust and metal chips from entering the interior of the speed reduction mechanism 10, avoiding accelerating gear wear or bearing failure. Further, through the clearance or preloading design of the bearing, the dimensional tolerance deviation during processing and assembly of the shaft and the housing 30 can be compensated, and at the same time, the thermal expansion difference caused by temperature change during operation can be absorbed, avoiding jamming caused by too tight fit or vibration caused by too loose fit, and ensuring the reliability of the speed reduction mechanism 10.

[0036] In some embodiments of the present application, the first bearing 41 is a deep groove ball bearing.

[0037] Please continue to refer to Figures 1 to 3 , in some embodiments of the present application, the sun gear shaft 21 has a connecting shaft 211, the connecting shaft 211 is in transmission connection with the transmission shaft 130, and the first bearing 41 is sleeved on the connecting shaft 211.

[0038] Please continue to refer toFigures 1 to 3 In some embodiments of the present application, the transmission shaft 130 is sleeved with the connecting shaft 211, and the first bearing 41 is sleeved on the sleeved section of the transmission shaft 130 and the connecting shaft 211.

[0039] In the embodiments of the present application, by sleeving the first bearing 41 on the sleeved section of the transmission shaft 130 and the connecting shaft 211, the first bearing 41 can be effectively utilized to disperse the radial force and axial force between the transmission shaft 130 and the connecting shaft 211. In addition, using bearing transmission can reduce the influence of friction on transmission. Therefore, the setting mode of the first bearing 41 in the present application can significantly reduce power loss.

[0040] Please continue to refer to Figures 1 to 3 In some embodiments of the present application, the transmission shaft 130 and the sun gear shaft 21 are coaxially arranged. In this way, the radial dimension of the reduction mechanism 10 can be reduced, thereby reducing the space occupied by the reduction mechanism 10 and facilitating the layout of the reduction mechanism 10 on the vehicle.

[0041] Please continue to refer to Figures 1 to 3 In some embodiments of the present application, the planetary mechanism further includes a first connecting member 22, and the first connecting member 22 is configured to connect the sun gear shaft 21 and the transmission shaft 130.

[0042] In the embodiments of the present application, by using the first connecting member 22 to connect the transmission shaft 130 and the sun gear shaft 21, the relative positions of the transmission shaft 130 and the sun gear shaft 21 can be prevented from changing, ensuring the transmission stability of the transmission shaft 130 and the reduction mechanism 10, thereby improving the reliability of the reduction mechanism 10 provided in the present application.

[0043] Please continue to refer to Figures 1 to 3 In some embodiments of the present application, the sun gear shaft 21 further has a sun gear 212 connected to one end of the connecting shaft 211. A first connection hole (not shown in the figure) is provided on the sun gear shaft 21. The first connection hole extends from the end face of the connecting shaft 211 facing away from the sun gear 212 to the end face of the sun gear 212 facing away from the transmission shaft 130. A second connection hole (not shown in the figure) is provided on the end face of the end of the transmission shaft 130 connected to the sun gear shaft 21. The first connecting member 22 is disposed in the first connection hole and the second connection hole. In this way, the possibility of the transmission shaft 130 disengaging axially along the transmission shaft 130 can be reduced, improving the connection stability between the transmission shaft 130 and the sun gear shaft 21, thereby improving the reliability of the reduction mechanism 10. In addition, providing the second connection hole on the end face of the end of the transmission shaft 130 connected to the connecting shaft 211 can also avoid the stress concentration problem caused by local thinning of the shaft end thickness.

[0044] In some embodiments of the present application, the first connection hole and the second connection hole are coaxially arranged. In this way, the load can be transmitted linearly along the axis, reducing energy loss and improving the bending / torsion resistance performance. At the same time, it can also simplify the assembly of the sun gear shaft 21 and the transmission shaft 130, improving the assembly efficiency.

[0045] Please continue to refer to Figures 1 to 3 , in some embodiments of the present application, the planetary mechanism further includes: a planetary gear 23 meshing with the sun gear 212; a planet carrier 24 connected to the planetary gear 23; and a second bearing 42 disposed between the end face of the sun gear 212 and the planet carrier 24, and the second bearing 42 is configured to bear the load in the axial direction of the reduction mechanism 10.

[0046] Adopting such a solution, the second bearing 42 can be used to bear the axial load of the reduction mechanism 10. Since bearings generally have high structural strength and are not easily damaged, the reliability of the reduction mechanism 10 can be improved.

[0047] Please continue to refer to Figures 1 to 3 , in some embodiments of the present application, the planet carrier 24 is configured to be connected to the hub bearing 120, so that the reduction mechanism 10 is supported in its radial direction by the hub bearing 120. In this way, the integration degree of the reduction mechanism 10 can be improved, the space occupied by the reduction mechanism 10 can be reduced, and the layout of the reduction mechanism 10 is facilitated.

[0048] Please refer to Figures 1 to 5 , Figure 4 is Figure 1 an enlarged schematic view of part A in Figure 5 is Figure 1 an enlarged schematic view of part B in

[0049] In some embodiments of the present application, in the axial direction of the transmission shaft 130, a first through hole 241 is formed in the planet carrier 24, a first seal 51 is disposed in the first through hole 241, a second seal 52 is disposed between the transmission shaft 130 and the housing 30, and a third seal 53 is disposed between the housing 30 and the planet carrier 24. The first seal 51, the second seal 52, the third seal 53, the housing 30, the transmission shaft 130 and the planet carrier 24 define a sealed cavity, so that the lubricating fluid flows in the sealed cavity to lubricate the planetary mechanism.

[0050] In some embodiments of the present application, in the axial direction of the transmission shaft 130, a first blind hole is formed in the planet carrier 24. A second seal 52 is provided between the transmission shaft 130 and the housing 30, and a third seal 53 is provided between the housing 30 and the planet carrier 24. The first blind hole, the second seal 52, the third seal 53, the housing 30, the transmission shaft 130, and the planet carrier 24 define a sealed cavity, so that the lubricating fluid flows in the sealed cavity to lubricate the planetary mechanism.

[0051] Please continue to refer to Figures 1 to 5 , in some embodiments of the present application, the contact surface between the planet carrier 24 and the second bearing 42 is the first connection surface 242. A first oil guide groove (not shown in the figure) is formed on the first connection surface 242, and the first oil guide groove is configured to guide the lubricating fluid to the second bearing 42. In this way, the lubricating fluid can be used to lubricate the second bearing 42, ensuring the normal operation of the second bearing 42, thereby improving the reliability of the reduction mechanism 10.

[0052] Please continue to refer to Figures 1 to 5 , in some embodiments of the present application, the planetary mechanism further includes: a third bearing 43, which is arranged between the surface of the planet carrier 24 facing away from the sun gear 212 and the housing 30, and the third bearing 43 is configured to bear the load in the axial direction of the transmission shaft 130.

[0053] Adopting such a scheme enables the third bearing 43 to bear the axial load of the reduction mechanism 10. Combining with the characteristic that the bearing has high structural strength, it helps to improve the reliability of the reduction mechanism 10.

[0054] In some embodiments of the present application, the second bearing 42 and / or the third bearing 43 is a thrust bearing.

[0055] Please continue to refer to Figures 1 to 5 , in some embodiments of the present application, the planetary mechanism further includes: a fourth bearing (not shown in the figure), which is arranged between the surface of the planet carrier 24 facing away from the sun gear 212 and the housing 30, and the fourth bearing is configured to bear the load in the radial direction of the reduction mechanism 10. Similar to or the same as the technical effect of the above embodiment of the first bearing 41, the present application will not elaborate here.

[0056] In some embodiments of the present application, the fourth bearing is a deep groove ball bearing.

[0057] Please continue to refer to Figures 1 to 5, in some embodiments of the present application, the planetary mechanism further includes: a pin shaft 25 configured to connect the planet carrier 24 and the planet gear 23. An oil passage 251 is provided in the pin shaft 25 and is configured to divert the lubricating fluid to the connection surface between the planet gear 23 and the planet carrier 24 to lubricate the planet gear 23 and the planet carrier 24. In this way, the normal operation of the planet gear 23 and the planet carrier 24 can be ensured, thereby improving the reliability of the reduction mechanism 10.

[0058] In some embodiments of the present application, the planetary mechanism further includes: a fifth bearing 44 disposed between the planet gear 23 and the pin shaft 25, and the fifth bearing 44 is configured to bear the load in the radial direction of the reduction mechanism 10.

[0059] In some embodiments of the present application, the fifth bearing 44 is a needle bearing.

[0060] Please continue to refer to Figures 1 to 5 , in some embodiments of the present application, one end of the oil passage 251 extends to the connection surface between the pin shaft 25 and the planet gear 23, and the other end extends to the end surface of the pin shaft 25 close to the transmission shaft 130, and a first oil port 252 is defined to enable the lubricating fluid to flow into the oil passage 251 from the first oil port 252.

[0061] Adopting such a scheme, the lubricating fluid can be introduced into the oil passage 251 from the first oil port 252, and the lubricating fluid flows along the oil passage 251 to the connection between the pin shaft 25 and the planet carrier 24 to lubricate the planet carrier 24 and the planet gear 23, thereby ensuring the normal operation of the planet carrier 24 and the planet gear 23 and improving the reliability of the reduction mechanism 10.

[0062] Please continue to refer to Figures 1 to 5 , in some embodiments of the present application, the planetary mechanism further includes: an oil collecting structure 253 disposed at the first oil port 252, and the oil collecting structure 253 is configured to divert the lubricating fluid to the first oil port 252. Similar to or the same as the technical effects of the above embodiments of the oil passage 251, they will not be elaborated herein in the present application.

[0063] Please continue to refer to Figures 1 to 5 , in some embodiments of the present application, the planetary mechanism further includes: a ring gear 26 having an internal gear ring and an outer peripheral surface. The internal gear ring meshes with the planet gear 23, and the outer peripheral surface is connected to the housing 30. In this way, the power can be output from the planet carrier 24. And the planet carrier 24 of the reduction mechanism 10 provided in the present application is connected to the hub bearing 120 of the wheel, so that the power can be successfully transmitted to the wheel, thereby driving the wheel to rotate, so that the rotational speed of the wheel can be changed through the reduction mechanism 10, and thus the torque of the wheel can be changed to meet the user's demand for large torque.

[0064] In some embodiments of the present application, the ring gear 26 and the housing 30 are connected by splines.

[0065] According to a second aspect of the present application, a vehicle is provided, including the deceleration mechanism 10 as described above. The vehicle has all the beneficial effects of the above deceleration mechanism 10, which will not be elaborated herein again in the present application.

[0066] The vehicle may be a fuel vehicle, a plug-in hybrid vehicle or a new energy vehicle, etc., and the present application does not make specific limitations thereto.

[0067] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0068] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not elaborated in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0069] The embodiments, implementation manners and related technical features of the present application can be combined and replaced with each other without conflict.

[0070] The above are only preferred embodiments of the present application and do not impose any form of limitation on the present application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A speed reduction mechanism (10), characterized in that: Applied to a vehicle, the vehicle comprises a steering knuckle (110) and a wheel, the wheel comprises a wheel hub bearing (120), and the speed reduction mechanism (10) comprises: A housing (30) is integrated with the steering knuckle (110); A planetary mechanism is disposed in the housing (30) and connected to the wheel hub bearing (120) to change the rotation speed of the wheel.

2. The speed reduction mechanism (10) according to claim 1, characterized in that: The vehicle also has a transmission shaft (130), and the planetary mechanism comprises: A sun gear shaft (21) connected to the transmission shaft (130); The first bearing (41) is arranged at one end of the sun gear shaft (21) close to the transmission shaft (130) and between the sun gear shaft (21) and the housing (30), and the first bearing (41) is configured to bear the load in the radial direction of the reduction mechanism (10).

3. The speed reduction mechanism (10) according to claim 2, characterized in that: The sun gear shaft (21) has a connecting shaft (211), the connecting shaft (211) is drivingly connected to the transmission shaft (130), and the first bearing (41) is sleeved on the connecting shaft (211).

4. The speed reduction mechanism (10) according to claim 3, characterized in that: The transmission shaft (130) is sleeved with the connecting shaft (211), and the first bearing (41) is sleeved on the sleeved section between the transmission shaft (130) and the connecting shaft (211).

5. The speed reduction mechanism (10) according to claim 3, characterized in that: The transmission shaft (130) is coaxially arranged with the sun gear shaft (21).

6. The speed reduction mechanism (10) according to claim 3, characterized in that: The planetary mechanism further comprises a first connecting member (22), wherein the first connecting member (22) is configured to connect the sun gear shaft (21) and the transmission shaft (130).

7. The speed reduction mechanism (10) according to claim 6, characterized in that: The sun gear shaft (21) also has a sun gear (212) connected to one end of the connecting shaft (211); a first connecting hole is provided on the sun gear shaft (21), and the first connecting hole extends from the end face of the connecting shaft (211) away from the sun gear (212) to the end face of the sun gear (212) away from the transmission shaft (130); a second connecting hole is provided on the end face of one end of the transmission shaft (130) connected to the sun gear shaft (21); and the first connecting member (22) is disposed in the first connecting hole and the second connecting hole.

8. The speed reduction mechanism (10) according to claim 7, characterized in that: The first connecting hole and the second connecting hole are coaxially arranged.

9. The speed reduction mechanism (10) according to claim 6, characterized in that: The planetary mechanism further comprises: A planetary gear (23) meshing with the sun gear (212); A planet carrier (24), connected to the planet gear (23); The second bearing (42) is disposed between the end surface of the sun gear (212) and the planet carrier (24), and the second bearing (42) is configured to bear the load of the speed reduction mechanism (10) in the axial direction.

10. The speed reduction mechanism (10) according to claim 9, characterized in that: The planet carrier (24) is configured to be connected to the wheel hub bearing (120) so that the reduction mechanism (10) is supported in its radial direction by the wheel hub bearing (120).

11. The speed reduction mechanism (10) according to claim 9, characterized in that: In the axial direction of the transmission shaft (130), a first through hole (241) is opened on the planet carrier (24), a first sealing member (51) is arranged in the first through hole (241), a second sealing member (52) is arranged between the transmission shaft (130) and the housing (30), and a third sealing member (53) is arranged between the housing (30) and the planet carrier (24), and the first sealing member (51), the second sealing member (52), the third sealing member (53), the housing (30), the transmission shaft (130) and the planet carrier (24) define a sealing cavity so that a lubricating fluid flows in the sealing cavity to lubricate the planetary mechanism.

12. The speed reduction mechanism (10) according to claim 11, characterized in that: The contact surface between the planet carrier (24) and the second bearing (42) is a first connecting surface (242), and a first oil guide groove is provided on the first connecting surface (242), and the first oil guide groove is configured to guide the lubricating fluid to the second bearing (42).

13. The speed reduction mechanism (10) according to claim 11 or 12, characterized in that: The planetary mechanism further comprises: The third bearing (43) is disposed between a surface of the planet carrier (24) facing away from the sun gear (212) and the housing (30), and the third bearing (43) is configured to bear the load of the transmission shaft (130) in the axial direction.

14. The speed reduction mechanism (10) according to claim 11 or 12, characterized in that: The planetary mechanism further comprises: A fourth bearing is disposed between a surface of the planet carrier (24) facing away from the sun gear (212) and the housing (30), and the fourth bearing is configured to bear a load in a radial direction of the speed reduction mechanism (10).

15. The speed reduction mechanism (10) according to claim 11, characterized in that: The planetary mechanism further comprises: A pin shaft (25) is configured to connect the planetary carrier (24) and the planetary gear (23), and an oil passage (251) is provided in the pin shaft (25). The oil passage (251) is configured to guide the lubricating fluid to the connecting surface between the planetary gear (23) and the planetary carrier (24) so ​​as to lubricate the planetary gear (23) and the planetary carrier (24).

16. The speed reduction mechanism (10) according to claim 15, characterized in that: The planetary mechanism further comprises: a fifth bearing (44) disposed between the planetary gear (23) and the pin shaft (25), and the fifth bearing (44) is configured to bear the load in the radial direction of the speed reduction mechanism (10).

17. The speed reduction mechanism (10) according to claim 15, characterized in that: One end of the oil passage (251) extends to the connection surface between the pin shaft (25) and the planetary gear (23), and the other end extends to the end surface of the pin shaft (25) close to the transmission shaft (130), and defines a first oil passage opening (252) so that the lubricating fluid flows from the first oil passage opening (252) into the oil passage (251).

18. The speed reduction mechanism (10) according to claim 17, characterized in that: The planetary mechanism further comprises: An oil collecting structure (253) is disposed at the first oil channel opening (252), and the oil collecting structure (253) is configured to guide the lubricating fluid to the first oil channel opening (252).

19. The speed reduction mechanism (10) according to claim 9, characterized in that: The planetary mechanism further comprises: The gear ring (26) comprises an inner gear ring and an outer peripheral surface, wherein the inner gear ring is meshed with the planetary gear (23), and the outer peripheral surface is connected to the housing (30).

20. A vehicle, characterized in that: It comprises the speed reduction mechanism (10) as claimed in any one of claims 1 to 19.

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