Wheel edge oil-sharing lubricating structure

Abstract

The invention relates to the technical field of vehicle transmission system lubrication, and discloses a wheel edge oil-sharing lubrication structure. Comprising a machine shell, a main reducer shell is arranged on the side surface of the machine shell, a hub reduction gear shell is connected to the side surface of the main reducer shell through bolts in a threaded mode, an output shaft is movably connected to the interior of the main reducer shell, a hub assembly is arranged in the hub reduction gear shell, and the hub assembly is connected with the output shaft in a sleeving mode; a single oil cavity lubricates a gear and a bearing at the same time, oil injection points are reduced, the wheel edge lubricating circulation design ensures that the heat dissipation and lubricating effects are good when the wheel edge is large in torque, the double-lip structure and the pressure relief design solve the oil leakage problem, active heat dissipation is achieved, the service life of the motor is prolonged, and the service life of the motor is prolonged. And the oil temperature is reduced, and online collection of abrasive dust is achieved through the magnetic oil drain plug.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle transmission system lubrication, in particular to a wheel edge common oil lubrication structure. BACKGROUND

[0002] The wheel edge common oil lubrication structure is a mechanical design integrating the lubrication of the hub bearing and the drive axle gear system, facilitating the common lubrication of the wheel edge and its internal components.

[0003] In the current wheel edge common oil lubrication structure, the gear box and the bearing cavity are isolated from each other, and different types of lubricating grease or lubricating oil need to be added separately, increasing the maintenance workload and cost, reducing the equipment maintenance efficiency, the sealing structure is complex, and the oil leakage problem occurs frequently. Leakage can cause the bearing to fail due to lack of oil, seriously affecting the normal operation and service life of the equipment, and the heat dissipation efficiency is low, local high temperature easily causes oil deterioration, shortens the oil replacement cycle, the wheel edge lubrication is not circulated, and under the condition of large torque, the wheel edge is prone to high temperature, thereby affecting the performance and reliability of the entire equipment. SUMMARY

[0004] To address the shortcomings of existing technologies, this invention provides a wheel-side common oil lubrication structure. Utilizing axial main oil passage delivery on the half-shaft, radial oil distribution holes for flow diversion, and oil storage in the oil reservoir, combined with the centrifugal oil guiding effect of the spiral oil guide grooves on the inner wall of the wheel hub, lubricating oil can be precisely delivered to key moving components such as wheel-side bearings and seals. This avoids frictional losses caused by lubrication blind spots and extends the service life of wheel-side components. The single oil chamber formed by the oil reservoir and the main reduction housing provides basic lubrication for the gear set, bearing mounting area, and transmission assembly within the gearbox through natural immersion or splashing during component movement. Simultaneously, dedicated lubrication channels on the output shaft for the first and second gear output wheels enhance lubrication at the gear meshing points, preventing wear and abnormal noise caused by insufficient lubrication during high-speed meshing. The arc-shaped oil collection hood on the inner wall of the housing collects lubricating oil splashed during the rotation of the motor-end drive wheel and guides it to the drive wheel journal, bearings, and meshing parts, replenishing the lubricating oil and ensuring the stability of the motor-end transmission system. The system operates at a constant speed, avoiding localized lubrication failure. During system maintenance, only the magnetic drain plug needs to be removed to simultaneously drain waste oil and clean impurities from the oil reservoir and single oil chamber, eliminating the need to disassemble complex components. This significantly simplifies the lubricant replacement process, reducing maintenance workload and time costs. High-temperature lubricant flows into the oil-side channel of the plate heat exchanger through pre-designed oil passages. The plate heat exchanger is also connected to the external coolant circuit, while low-temperature coolant continuously flows into the water-side channel of the heat exchanger. The close proximity of the oil-side and water-side channels provides excellent conditions for heat exchange. High-temperature lubricant and low-temperature coolant transfer heat through thin metal plates within the heat exchanger. The heat from the lubricant is absorbed by the coolant, lowering its own temperature. The coolant, having absorbed heat, flows back to the vehicle's cooling system through the external circuit, dissipating the heat to the external environment. The cooled lubricant, through the heat exchanger, can then flow back to the oil reservoir of the main reduction gear housing, providing low-temperature, high-efficiency lubrication for internal moving parts.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A housing is included, a main reduction housing is provided on the side surface of the housing, a wheel-side reducer housing is connected to the side surface of the main reduction housing by bolts and threads, an output shaft is movably connected inside the main reduction housing, a wheel hub assembly is provided inside the wheel-side reducer housing and is sleeved and connected to the output shaft, and a motor-end drive wheel is provided inside the housing and is fixedly connected to the left end of the output shaft;

[0006] The wheel-side reducer housing is integrated to form a hub housing. The integrated hub housing has an oil reservoir inside, which is connected to the main reducer housing via an oil pipe. A gear set is installed inside the wheel-side reducer housing. The gear set includes a first planetary gear, a second planetary gear, and a third planetary gear. The second planetary gear is fixedly connected to the right end of the output shaft, and the second and third planetary gears mesh with each other. A bearing mounting assembly is installed inside the main reducer housing. The bearing mounting assembly includes an inner bearing, a tapered roller bearing, a half-shaft, and a half-shaft sleeve. The inner bearing, tapered roller bearing, half-shaft, and half-shaft sleeve are all sleeved and connected to the output shaft. A gear shift assembly is installed inside the main reducer housing. The gear shift assembly includes a first-gear output wheel, a second-gear output wheel, and a combination sleeve. The first-gear output wheel is located to the right of the second-gear output wheel.

[0007] Preferably, a magnetic drain plug is provided at the bottom of the oil storage chamber, and a common oil circulation circuit is provided inside the main reducer housing. The common oil circulation circuit includes an axial main oil passage that passes through the center of the half shaft and is connected to an external main oil tank.

[0008] Preferably, the common oil circulation circuit includes a radial oil distribution hole, which is opened on the outer surface of the half shaft and connects the axial main oil passage and the oil storage chamber.

[0009] Preferably, the inner wall of the hub assembly is milled to form a spiral oil guide groove, which communicates with the interior of the oil storage cavity.

[0010] Preferably, a plate heat exchanger is provided on the rear surface of the main reducer housing, and the plate heat exchanger is connected to the oil storage chamber and the external coolant circuit respectively.

[0011] Preferably, the upper surface of the main reducer housing is provided with a vent valve, which is connected to the oil storage chamber.

[0012] Preferably, the oil storage chamber and the internal cavity of the main reducer housing together form a single oil chamber, which is connected to the gear set, bearing mounting area and transmission set.

[0013] Preferably, the inner sidewall of the housing is provided with an arc-shaped oil collection cover corresponding to the position of the motor end drive wheel, the opening of the arc-shaped oil collection cover faces the rotation direction of the motor end drive wheel, and the outer surface of the combined sleeve is provided with a plurality of axial oil grooves.

[0014] Preferably, a stepped sealing assembly is provided between the connection surfaces of the main reducer housing and the wheel-side reducer housing, and the inner wall of the oil reservoir is coated with a polytetrafluoroethylene wear-resistant coating.

[0015] Preferably, the output shaft is provided with lubrication oil passages corresponding to the positions of the first gear output wheel and the second gear output wheel, and the main reducer housing and the wheel-side reducer housing are both made of aluminum alloy casting.

[0016] Compared with the prior art, the present invention provides a wheel-side common oil lubrication structure, which has the following beneficial effects:

[0017] 1. This invention utilizes the axial main oil passage for delivery from the half-shaft, the radial oil distribution hole for diversion, and the oil storage chamber for oil storage. Combined with the centrifugal oil guiding effect of the spiral oil guide groove on the inner wall of the wheel hub, it can accurately deliver lubricating oil to key moving parts such as wheel-side bearings and seals. This avoids frictional losses caused by lubrication blind spots and extends the service life of wheel-side components. The single oil chamber formed by the oil storage chamber and the main reduction housing can provide basic lubrication for the gear set, bearing mounting area, and transmission group inside the gearbox through natural immersion or splashing during component movement. At the same time, the dedicated lubrication oil passages on the output shaft for the first and second gear output wheels can enhance the lubrication of the transmission. Lubrication at the gear meshing point prevents wear and abnormal noise caused by insufficient lubrication on the gear surface during high-speed meshing. The arc-shaped oil collection cover on the inner wall of the housing can collect the lubricating oil splashed during the rotation of the motor-end drive wheel and guide it to the drive wheel journal, bearing and meshing parts to replenish the lubricating oil, ensuring the stable operation of the motor-end transmission system and avoiding local lubrication failure. During system maintenance, only the magnetic drain plug needs to be removed to simultaneously drain the waste oil and clean the impurities in the oil storage chamber and single oil chamber. There is no need to disassemble complex parts, which greatly simplifies the lubricating oil replacement process and reduces maintenance workload and time costs.

[0018] 2. In this invention, the high-temperature lubricating oil flows into the oil-side channel of the plate heat exchanger through a pre-set oil passage. The plate heat exchanger is also connected to an external coolant circuit. The low-temperature coolant continuously flows into the water-side channel of the heat exchanger. The oil-side and water-side channels are closely adjacent, providing good conditions for heat exchange. The high-temperature lubricating oil and the low-temperature coolant transfer heat through a thin metal plate in the heat exchanger. The heat of the lubricating oil is absorbed by the coolant, and its own temperature decreases. The coolant, after absorbing heat, flows back to the vehicle cooling system through an external circuit to dissipate the heat to the external environment. The lubricating oil, after cooling, can flow back to the oil storage chamber of the main reduction gear housing through the heat exchanger to provide low-temperature and efficient lubrication for the internal moving parts again. Attached Figure Description

[0019] Fig. 1 This is a front view structural diagram of the present invention;

[0020] Fig. 2 This is a schematic diagram of a partial internal structure of the present invention;

[0021] Fig. 3 This is a schematic diagram of a partial rear view of the present invention.

[0022] The components are as follows: 1. Main reducer housing; 2. Half shaft; 3. Inner bearing; 4. Third planetary gear; 5. First planetary gear; 6. Wheel-side reducer housing; 7. Hub assembly; 8. Half shaft sleeve; 9. Tapered roller bearing; 10. Motor end drive wheel; 11. Second gear output wheel; 12. Combination sleeve; 13. First gear output wheel; 14. Output shaft; 15. Housing; 16. Oil pipe; 17. Plate heat exchanger; 18. Magnetic drain plug; 19. Second planetary gear; 20. Breather valve. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figs. 1-3 A wheel-side oil-lubricated structure includes a housing 15, a main reducer housing 1 on the side surface of the housing 15, a wheel-side reducer housing 6 connected to the side surface of the main reducer housing 1 by bolts and threads, an output shaft 14 movably connected inside the main reducer housing 1, a wheel hub assembly 7 inside the wheel-side reducer housing 6, and the wheel hub assembly 7 being sleeved and connected to the output shaft 14, a motor-end drive wheel 10 inside the housing 15, and the motor-end drive wheel 10 being fixedly connected to the left end of the output shaft 14, a stepped sealing assembly between the connecting surfaces of the main reducer housing 1 and the wheel-side reducer housing 6, and a polytetrafluoroethylene wear-resistant coating sprayed on the inner wall of the oil reservoir. Both the main reducer housing 1 and the wheel-side reducer housing 6 are made of aluminum alloy.

[0025] During the rotation of the output shaft 14, power is transmitted to the hub assembly 7, which is sleeved and connected to its right end. The hub assembly 7 is located inside the wheel-side reducer housing 6, thus enabling the wheel-side reducer to operate. When the wheel-side reducer is operating, the lubricating oil in the oil reservoir plays a lubricating role. The polytetrafluoroethylene wear-resistant coating sprayed on the inner wall of the oil reservoir reduces friction between the lubricating oil and the inner wall of the oil reservoir, reducing energy loss and improving the wear resistance of the inner wall of the oil reservoir, thus extending its service life. The stepped sealing assembly between the main reducer housing 1 and the wheel-side reducer housing 6 plays a crucial sealing role, effectively preventing lubricating oil from entering the reducer. Leakage occurs at the connection gap between the main reducer housing 1 and the wheel-side reducer housing 6, ensuring that the lubricating oil is always within the oil reservoir. Both the main reducer housing 1 and the wheel-side reducer housing 6 are cast from aluminum alloy, which has the advantages of being lightweight and having high strength. While ensuring that the structural strength meets the working requirements, the weight of the entire device is reduced, which helps to improve the vehicle's fuel economy or driving range. At the same time, during vehicle operation, this wheel-side co-lubrication structure can work continuously and stably, lubricating each transmission component through lubricating oil, reducing wear between components, extending the overall service life of the device, and ensuring the normal operation of the vehicle.

[0026] The wheel-side reducer housing 6 is integrated to form a hub housing. The integrated hub housing has an oil reservoir inside, which is connected to the main reducer housing 1 through an oil pipe 16. The wheel-side reducer housing 6 is equipped with a gear set, which includes a first planetary gear 5, a second planetary gear 19, and a third planetary gear 4. The second planetary gear 19 is fixedly connected to the right end of the output shaft 14, and the first planetary gear 5, the second planetary gear 19, and the third planetary gear 4 are meshed together. The main reducer housing 1 is equipped with a bearing mounting assembly, which includes an inner bearing 3, a tapered roller bearing 9, a half shaft 2, and a half shaft sleeve 8. The inner bearing 3, the tapered roller bearing 9, the half shaft 2, and the half shaft sleeve 8 are all sleeved and connected to the output shaft 14. The main reducer housing 1 is equipped with a speed change assembly, which includes a first gear output wheel 13, a second gear output wheel 11, and a combination sleeve 12. The first gear output wheel 13 is located to the right of the second gear output wheel 11.

[0027] In this transmission system, the engine's power is transmitted sequentially through the clutch, gearbox, and transfer case to the main reducer within the main reduction housing 1 of the front and rear axles. The main reducer reduces and increases torque, then changes direction and transmits the torque to the differential housing. The differential then distributes the torque to the two half-shafts 2. The half-shafts 2 engage with the bearing assembly within the main reduction housing 1. The inner bearing 3 and tapered roller bearing 9 support the output shaft 14, while the half-shaft sleeve 8 protects and positions the half-shafts 2. Power is then transmitted through the half-shafts 2 to the wheel-side reducer section, which is integrated within the wheel hub housing. The wheel-side reducer housing 6 contains a gear set. The power from the half-shafts 2 drives the first planetary gear 5 to rotate. Since the first planetary gear 5, the second planetary gear 19, and the third planetary gear 4 mesh with each other... Next, the first planetary gear 5 drives the second planetary gear 19 and the third planetary gear 4 to rotate simultaneously. The second planetary gear 19 is fixedly connected to the right end of the output shaft 14, transmitting power to the output shaft 14 to achieve speed reduction and torque increase. The wheel hub housing formed by the wheel-side reducer housing 6 is equipped with an oil storage chamber. The oil storage chamber is connected to the main reducer housing 1 through the oil pipe 16, which can realize the circulation of lubricating oil to lubricate and dissipate heat from components such as the gear set and bearing mounting assembly. The gear set inside the main reducer housing 1 can achieve different transmission ratios by using the combination sleeve 12 to engage with different output wheels through gear shifting operation, so as to meet the speed and torque requirements of the vehicle under different driving conditions. The power after the wheel-side reducer reduces speed and increases torque is transmitted to the wheel, so that the wheel generates a large driving force under the reaction of the ground adhesion force, driving the car.

[0028] A magnetic drain plug 18 is provided at the bottom of the oil storage chamber. A common oil circulation circuit is provided inside the main reduction housing 1. The common oil circulation circuit includes an axial main oil passage, which passes through the center of the half shaft 2 and is connected to the external main oil tank. The common oil circulation circuit includes a radial oil distribution hole, which is opened on the outer surface of the half shaft 2 and connects the axial main oil passage to the oil storage chamber. The inner wall of the hub assembly 7 is milled to form a spiral oil guide groove, which is connected to the interior of the oil storage chamber. An arc-shaped oil collection cover is provided on the inner side wall of the housing 15 corresponding to the position of the motor end drive wheel 10. The opening of the arc-shaped oil collection cover faces the rotation direction of the motor end drive wheel 10. Several axial oil grooves are opened on the outer surface of the combined sleeve 12. Lubrication oil passages are provided on the output shaft 14 corresponding to the positions of the first gear output wheel 13 and the second gear output wheel 11. The oil storage chamber and the internal cavity of the main reduction housing 1 together form a single oil chamber. The single oil chamber is connected to the gear set, the bearing mounting area and the transmission set.

[0029] The system draws lubricating oil from the external main oil tank via an oil pump, pressurizes the oil, and introduces it into the axial main oil passage of the wheel-side common oil circulation circuit. The axial main oil passage runs through the center of the half-shaft 2. The lubricating oil enters the main delivery pipe inside the wheel-side from the outside, ensuring that the oil is stably delivered to the wheel-side area along the axial direction of the half-shaft 2. During the delivery process in the axial main oil passage, the radial oil distribution hole opened on the outer surface of the half-shaft 2 plays a diversion role. One end of the radial oil distribution hole is connected to the axial main oil passage, and the other end is directly connected to the oil storage chamber, allowing some lubricating oil to enter the oil storage chamber through the hole, completing the local oil storage at the wheel-side and reserving the oil source for the subsequent lubrication of the wheel-side components. The oil storage chamber is connected to the inner wall of the wheel hub assembly 7, and the inner wall of the wheel hub assembly 7... The milled spiral oil guide groove utilizes the centrifugal motion of the rotating hub to transport the lubricating oil in the oil reservoir along the path of the oil guide groove to key wheel-side components such as bearings and seals inside the hub, forming continuous lubrication for the moving parts of the wheel-side and reducing friction loss. The single oil chamber, which is formed by the oil reservoir and the internal cavity of the main reduction housing 1, is directly connected to the gear set, bearing mounting area, and transmission group inside the gearbox. The lubricating oil in the single oil chamber can naturally wet or splash onto the surface of these components through component movement, forming basic lubrication. The output shaft 14 is specially equipped with lubrication oil passages at the positions corresponding to the first gear output wheel 13 and the second gear output wheel 11, which can accurately guide the lubricating oil in the axial main oil passage or the single oil chamber. To enhance lubrication at the gear meshing points, preventing tooth surface wear due to insufficient lubrication during high-speed meshing, an arc-shaped oil collection shroud is installed on the inner wall of the housing 15 corresponding to the position of the motor-end drive wheel 10. The shroud's opening faces the rotation direction of the motor-end drive wheel 10. When the motor-end drive wheel 10 rotates, splashed lubricating oil is collected by the arc-shaped oil collection shroud and guided along its inner wall to the drive wheel's journal, bearing, or meshing area, replenishing the lubricating oil and ensuring stable lubrication of the motor-end transmission components. The oil groove guides lubricating oil from a single oil chamber or axial main oil passage to flow along the surface of the combined sleeve 12 to the mating clearance between it and adjacent components, lubricating the mating surfaces and reducing sliding friction. After lubrication of the wheel rims and gearbox components, some lubricating oil will fall back into the oil reservoir or single oil chamber due to gravity or component movement, and re-enter the common oil circulation circuit. The lubricating oil at the bottom of the housing can flow back to the external main oil tank, where it will be drawn and pressurized again by the oil pump to enter the next lubrication cycle, forming a closed-loop system of oil supply, lubrication, return, and resupply. The magnetic drain plug 18 at the bottom of the oil reservoir can adsorb metal debris in the oil during the lubricating oil circulation process, reducing the contamination of the lubrication system by impurities and improving the cleanliness of the lubricating oil. At the same time, during system maintenance, the waste oil in the oil reservoir and single oil chamber can be drained by removing the magnetic drain plug 18, which facilitates the replacement of lubricating oil.

[0030] A plate heat exchanger 17 is provided on the rear surface of the main reducer housing 1. The plate heat exchanger 17 is connected to the oil storage chamber and the external coolant circuit respectively. A vent valve 20 is provided on the upper surface of the main reducer housing 1. The vent valve 20 is connected to the oil storage chamber.

[0031] The lubricating oil in the oil storage chamber of the main reducer housing 1 gradually increases in temperature due to frictional heat generated by the meshing of internal gears and the rotation of bearings. The high-temperature lubricating oil flows into the oil-side flow channel of the plate heat exchanger 17 through a pre-set oil passage. The plate heat exchanger 17 is also connected to an external coolant circuit, and the low-temperature coolant continuously flows into the water-side flow channel of the heat exchanger. The oil-side and water-side flow channels are closely adjacent, providing good conditions for heat exchange. The high-temperature lubricating oil and the low-temperature coolant transfer heat through the metal plates inside the heat exchanger. The heat of the lubricating oil is absorbed by the coolant, and its own temperature decreases. The coolant, after absorbing heat, then flows through the water-side flow channel. The lubricating oil, which flows back to the vehicle cooling system through the external circuit and dissipates heat to the external environment, is cooled down. It can then flow back to the oil reservoir of the main reducer housing 1 through the heat exchanger, providing low-temperature and efficient lubrication for the internal moving parts. When the air pressure in the oil reservoir rises to the preset opening pressure of the vent valve 20, the vent valve 20 is opened, and the high-pressure air in the oil reservoir is discharged to the outside through the exhaust channel of the vent valve 20, reducing the air pressure in the reservoir to a normal level. The main reducer housing 1, the plate heat exchanger 17, and the vent valve 20 complement each other to ensure the reliable operation of the main reducer.

[0032] During operation, after the engine starts, power is transmitted sequentially through the clutch, transmission, and transfer case to the main reducer in the main reduction housing 1 of the front and rear axles. The main reducer reduces speed, increases torque, and changes the direction of power, then distributes it to the two half-shafts 2 via the differential. The half-shafts 2 drive the gear sets of the wheel-side reducers to rotate, ultimately driving the wheels via the output shaft 14 and the wheel hub assembly 7. Depending on the driving conditions, the gearbox shifts gears, allowing the combination sleeve 12 to engage with different gear output wheels to achieve different transmission ratios and adjust vehicle speed and torque. The oil pump draws lubricating oil from the external main oil tank, pressurizes it, and delivers it to the wheel-side area via the axial main oil passage. Some lubricating oil is diverted to the oil reservoir through the radial oil distribution holes on the outer surface of the half-shafts 2, completing local oil storage. The lubricating oil in the oil reservoir is then delivered to the wheel-side bearings and sealing surfaces via the spiral oil guide grooves on the inner wall of the wheel hub assembly 7 using centrifugal force as the wheel hub rotates. In components such as seals, the lubricating oil in the single oil chamber is naturally soaked or splashed by the movement of the components to lubricate the gear set, bearings, and transmission group of the gearbox. The lubricating oil channel on the output shaft 14 guides the lubricating oil to the meshing point of the gear teeth. The arc-shaped oil collection cover collects the splashed lubricating oil, which enhances the lubrication of the motor end drive wheel 10 and bearings. The oil groove guides the lubricating oil to the mating clearance between the combination sleeve 12 and adjacent components to reduce sliding friction. After lubrication, the lubricating oil falls back to the oil storage chamber or single oil chamber due to gravity or component movement, and flows back to the external main oil tank through the bottom of the housing. It is then circulated again by the oil pump to form a closed-loop system. When the lubricating oil in the oil storage chamber heats up due to friction, the high-temperature oil flows into the plate heat exchanger 17 through the oil channel to exchange heat with the low-temperature coolant and cool down. After cooling, it flows back to the oil storage chamber. If the air pressure in the oil storage chamber is too high, the vent valve 20 automatically opens to exhaust air and maintain the air pressure in the chamber.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wheel-side oil-lubricated structure, comprising a housing (15), characterized in that: The main reducer housing (1) is provided on the side surface of the housing (15). The side surface of the main reducer housing (1) is connected to the wheel-side reducer housing (6) by bolt thread. The output shaft (14) is movably connected inside the main reducer housing (1). The wheel-side reducer housing (6) is provided with a hub assembly (7), and the hub assembly (7) is sleeved and connected to the output shaft (14). The motor end drive wheel (10) is provided inside the housing (15), and the motor end drive wheel (10) is fixedly connected to the left end of the output shaft (14). The wheel-side reducer housing (6) is integrated to form a hub housing. The integrated hub housing has an oil reservoir inside, which is connected to the main reducer housing (1) via an oil pipe (16). The wheel-side reducer housing (6) contains a gear set, which includes a first planetary gear (5), a second planetary gear (19), and a third planetary gear (4). The second planetary gear (19) is fixedly connected to the right end of the output shaft (14), meshing with the first planetary gear (5), the second planetary gear (19), and the third planetary gear (4). The main reducer housing... The body (1) is equipped with a bearing mounting assembly, which includes an inner bearing (3), a tapered roller bearing (9), a half shaft (2) and a half shaft sleeve (8). The inner bearing (3), tapered roller bearing (9), half shaft (2) and half shaft sleeve (8) are all sleeved and connected to the output shaft (14). The main reduction housing (1) is equipped with a speed change assembly, which includes a first gear output wheel (13), a second gear output wheel (11) and a combination sleeve (12). The first gear output wheel (13) is located to the right of the second gear output wheel (11).

2. The wheel-side co-oil lubrication structure according to claim 1, characterized in that: A magnetic drain plug (18) is provided at the bottom of the oil storage chamber. A common oil circulation circuit is provided inside the main reducer housing (1). The common oil circulation circuit includes an axial main oil passage. The axial main oil passage passes through the center of the half shaft (2). The axial main oil passage is connected to an external main oil tank.

3. The wheel-side co-oil lubrication structure according to claim 2, characterized in that: The common oil circulation circuit includes a radial oil distribution hole, which is opened on the outer surface of the half shaft (2) and connects the axial main oil passage with the oil storage chamber.

4. The wheel-side co-oil lubrication structure according to claim 1, characterized in that: The inner wall of the hub assembly (7) is milled to form a spiral oil guide groove, which is connected to the interior of the oil storage cavity.

5. The wheel-side co-oil lubrication structure according to claim 1, characterized in that: The rear surface of the main reducing shell (1) is provided with a plate heat exchanger (17), which is connected to the oil storage chamber and the external coolant circuit respectively.

6. The wheel-side co-oil lubrication structure according to claim 1, characterized in that: The upper surface of the main reducer housing (1) is provided with a vent valve (20), which is connected to the oil storage chamber.

7. The wheel-side co-oil lubrication structure according to claim 1, characterized in that: The oil storage chamber and the internal cavity of the main reducer housing (1) together form a single oil chamber, which is connected to the gear set, bearing mounting area and transmission set.

8. The wheel-side co-oil lubrication structure according to claim 1, characterized in that: An arc-shaped oil collection cover is provided on the inner side wall of the housing (15) corresponding to the position of the motor end drive wheel (10). The opening of the arc-shaped oil collection cover faces the rotation direction of the motor end drive wheel (10). Several axial oil grooves are opened on the outer surface of the combined sleeve (12).

9. The wheel-side co-oil lubrication structure according to claim 1, characterized in that: A stepped sealing assembly is provided between the connection surfaces of the main reducer housing (1) and the wheel-side reducer housing (6), and the inner wall of the oil storage chamber is coated with a polytetrafluoroethylene wear-resistant coating.

10. The wheel-side co-oil lubrication structure according to claim 1, characterized in that: The output shaft (14) is provided with lubrication channels corresponding to the positions of the first gear output wheel (13) and the second gear output wheel (11). The main reducer housing (1) and the wheel-side reducer housing (6) are both made of aluminum alloy.

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