Lubricating oil filtering system of hybrid power tank

Abstract

The utility model discloses a lubricating oil filtering system for a hybrid power tank, which comprises a lubricating system for conveying lubricating oil to a lubricating part, the lubricating system comprises a primary filter and a secondary filter, the primary filter is used for filtering the lubricated lubricating oil and conveying the lubricating oil to an oil pan, and the secondary filter is used for filtering the lubricated lubricating oil and conveying the lubricating oil to an oil pan. The secondary filter is used for filtering lubricating oil conveyed from an oil pan to a lubricating part; the backwashing system and the lubricating system can be switched for use, and the backwashing system is used for conveying lubricating oil filtered by the secondary filter back to a clean oil outlet formed in the secondary filter to carry out backwashing on the interior of the secondary filter; the back-washed lubricating oil is discharged into the primary filter from a sewage discharge outlet formed in the secondary filter; the lubricating oil filtering system can effectively filter impurities in lubricating oil, solves the problems that a traditional filtering system is low in efficiency and difficult to maintain, and has the advantages of improving the filtering efficiency, enhancing the self-cleaning capacity of the system, being convenient to maintain and the like.

Description

Hybrid box lubricating oil filtration system Technical Field

[0001] This utility model relates to the technical field of hybrid gearboxes, and in particular to a hybrid gearbox lubricating oil filtration system. Background Technology

[0002] A hybrid transmission (hereinafter referred to as a hybrid gearbox) is a transmission system that couples the power of an engine and a drive motor in a certain way and can achieve speed and torque changes. As a core component of new energy vehicles, improving the reliability and durability of the transmission system has become one of the key research directions for technicians in this field.

[0003] In existing technologies, after prolonged operation, impurities easily accumulate between the moving friction pairs in a hybrid transmission. These impurities contaminate the lubricating oil and circulate throughout the lubrication circuit. To address this issue, a filtration structure is installed in the lubrication circuit of the hybrid transmission to ensure that less impurity reaches the moving friction pairs. However, traditional valve plate filters, located inside the transmission housing, cannot be routinely maintained, leading to secondary filter blockage requiring disassembly and repair. Furthermore, in existing two-stage filtration solutions, the synergistic effect of coarse and fine filtration diminishes over time, resulting in decreased filtration efficiency, increased pressure differential, and ultimately, poor lubrication, bearing corrosion, and abnormal gear wear. These defects not only degrade the NVH performance of the transmission and increase energy loss but also significantly shorten the lifespan of critical moving components. Although the industry has attempted to supplement filtration with external oil filters, it still cannot fundamentally solve the technical bottlenecks of insufficient system self-cleaning ability and poor maintenance convenience.

[0004] Therefore, it is necessary to improve the existing lubricating oil filtration system of the hybrid gearbox, so as to ensure the filtration effect of impurities and give it a certain self-cleaning ability, thereby reducing the need for frequent filter replacement and extending the service life of the hybrid gearbox. Summary of the Invention

[0005] In view of this, the present invention provides a hybrid gearbox lubricating oil filtration system. By setting a two-stage filtration system with a primary filter and a secondary filter, and combining it with a switchable backwashing system, it can effectively filter metal particles and impurities in the lubricating oil, while maintaining the cleanliness of the filtration system through the backwashing function.

[0006] The hybrid gearbox lubricating oil filtration system provided by this utility model adopts the following technical solution:

[0007] A hybrid gearbox lubricating oil filtration system includes a lubrication system for delivering lubricating oil to lubrication points. The lubrication system includes a primary filter and a secondary filter. The primary filter is used to filter the lubricating oil after lubrication and deliver it to the oil pan. The secondary filter is used to filter the lubricating oil delivered from the oil pan to the lubrication points.

[0008] It also includes a backwashing system that can be switched with the lubrication system. The backwashing system is used to transport the lubricating oil filtered by the secondary filter back to the clean oil outlet provided on the secondary filter to backwash the inside of the secondary filter, and to discharge the backwashed lubricating oil from the drain outlet provided on the secondary filter to the primary filter.

[0009] Furthermore, the primary filter is provided with an impurity separation section, which is used to adsorb and separate impurities in the lubricating oil that flows back to the oil pan.

[0010] Furthermore, the primary filter has a primary filter inlet and an oil collection chamber is provided at the primary filter inlet. The oil collection chamber is used to receive lubricating oil after lubrication or backwashing, and to transport the lubricating oil to the impurity separation section inside the primary filter through the primary filter inlet.

[0011] The primary filter also has a primary filter outlet for delivering lubricating oil to the oil pan.

[0012] Furthermore, the impurity separation section includes a magnet and a slag discharge port arranged sequentially in the oil passage inside the primary filter in the direction of lubricating oil flow. The magnet is used to adsorb magnetic impurities in the lubricating oil, and the slag discharge port is used to discharge impurities that have settled in the oil passage.

[0013] Furthermore, a magnetic oil discharge bolt is provided at the slag discharge port to control the opening and closing of the slag discharge port.

[0014] Furthermore, it also includes an oil pump, which is located between the secondary filter and the lubrication point and is used to provide power for pumping lubricating oil to the lubrication system and the backflushing system.

[0015] Furthermore, it also includes an oil storage chamber disposed between the oil pump and the lubrication part, the oil storage chamber being used to collect a predetermined amount of lubricating oil filtered by a secondary filter in the lubrication system and to provide lubricating oil for backflushing in the backflushing system.

[0016] Furthermore, the secondary filter includes a secondary filter housing and a secondary filter element. The secondary filter housing has a secondary filter inlet. The secondary filter inlet, the secondary filter element, and the clean oil outlet form a filtration channel within the secondary filter. The clean oil outlet, the secondary filter element, and the sewage outlet form a backwashing channel.

[0017] Furthermore, the lubrication system also includes a first valve assembly arranged sequentially along the lubrication flow path and used to control the opening and closing of the lubrication system, and a second valve assembly arranged sequentially along the backwash flow path and used to control the opening and closing of the backwash system.

[0018] The first valve assembly includes a first control valve disposed between the oil pan and the oil inlet of the secondary filter, a second control valve disposed between the clean oil outlet of the secondary filter and the oil pump inlet, a third control valve disposed between the oil pump outlet and the lubrication part, and a fourth control valve disposed between the oil pump outlet and the oil storage chamber.

[0019] The second valve assembly includes a fifth control valve disposed between the oil storage chamber and the oil pump inlet, a sixth control valve spanning the second control valve and the oil pump and disposed between the oil pump outlet and the clean oil outlet of the secondary filter, and a seventh control valve disposed between the secondary filter drain outlet and the primary filter.

[0020] Furthermore, it also includes an electronic controller for controlling the opening and closing of the oil pump and valve assembly.

[0021] In summary, this utility model has at least one of the following beneficial technical effects: by setting a two-stage filtration system with a primary filter and a secondary filter, it can effectively filter metal particles and impurities in lubricating oil; at the same time, it sets a switchable backwashing system to maintain the cleanliness of the filtration system, which solves the problems of low efficiency and difficult maintenance of traditional filtration systems, and has the advantages of improving filtration efficiency, enhancing the system's self-cleaning ability, and facilitating maintenance. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 is a structural schematic diagram of an embodiment of the present invention (the dashed line represents the control circuit diagram of the electronic controller);

[0024] Figure 2 is a schematic diagram of the structure of the secondary filter according to an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of the gear oil flow direction during filtration in an embodiment of the present invention.

[0026] Figure 4 is a schematic diagram of the gear oil flow direction during filter cleaning according to an embodiment of the present invention.

[0027] The attached diagram is labeled as follows: 1. Lubrication system; 2. Backflushing system; 3. Primary filter; 4. Secondary filter; 5. Secondary filter inlet; 6. Clean oil outlet; 7. Sewage outlet; 8. Oil pan; 9. Lubrication part; 10. Oil pump; 11. Electronic controller; 12. Oil reservoir; 13. First control valve; 14. Second control valve; 15. Third control valve; 16. Fourth control valve; 17. Fifth control valve; 18. Sixth control valve; 19. Seventh control valve; 20. Secondary filter housing; 21. Secondary filter element; 22. Oil collection chamber; 23. Oil passage; 24. Magnet; 25. Magnetic drain bolt; 26. Primary filter element; 27. Sludge discharge port. Detailed Implementation

[0028] As shown in the figure, the present application proposes a hybrid gearbox lubricating oil filtration system, which includes a lubrication system 1 for delivering lubricating oil to the lubrication part 9. The lubrication system 1 includes a primary filter 3 and a secondary filter 4. The primary filter 3 is used to filter the lubricating oil after lubrication and deliver it to the oil pan 8. The secondary filter 4 is used to filter the lubricating oil delivered from the oil pan 8 to the lubrication part 9.

[0029] It also includes a backwashing system 2 that can be switched with the lubrication system 1. The backwashing system 2 is used to transport the lubricating oil filtered by the secondary filter 4 back to the clean oil outlet 6 provided on the secondary filter 4 to backwash the interior of the secondary filter 4, and discharge the backwashed lubricating oil from the drain outlet 7 provided on the secondary filter 4 to the primary filter 3.

[0030] The primary filter 3 (i.e., the coarse filter) is mainly used to filter larger particulate impurities in the lubricating oil after lubrication and delivers the coarsely filtered lubricating oil to the oil pan 8 of the hybrid gearbox. It can adopt a metal mesh or paper filter element structure. The secondary filter 4 (i.e., the fine filter) is mainly used for secondary filtration of the lubricating oil flowing from the oil pan 8 to the lubrication part 9, so as to further reduce the impurities in the lubricating oil flowing to the lubrication part 9 and avoid problems such as poor lubrication, bearing corrosion and abnormal gear wear. It can use high-precision filter paper or composite filter media to intercept fine particles. The lubrication part 9 generally refers to the gear friction pair assembly set in the hybrid gearbox. This is existing technology and will not be described in detail here. In existing dual-stage filtration systems within hybrid gearboxes, the post-cleaning process of the secondary filter 4 is quite complex, requiring disassembly and cleaning of its internal filter components. This prevents the secondary filter 4 from self-cleaning. Therefore, this application incorporates a backflushing system 2 within the lubrication system 1. This system reverse-flushes the secondary filter 4 by switching the oil path direction. The clean oil outlet 6 and the wastewater outlet 7 are designed as two oil outlets at different locations on the secondary filter 4, but the clean oil outlet 6 can also serve as a backflushing inlet when the backflushing system 2 is operating. Switching between the lubrication system 1 and the backflushing system 2 can be achieved via a solenoid valve assembly or a manual valve. The oil path connection uses a rigid pipe or flexible hose arrangement. The oil pan 8 can be designed with a sedimentation tank to facilitate impurity deposition. A one-way valve can be installed between the primary filter 3 and the oil pan 8 to prevent oil backflow.

[0031] This solution effectively solves the lubrication problem caused by the accumulation of impurities inside the hybrid gearbox by setting up a dual-stage filtration system combined with a backwashing function. When the lubrication system 1 is working, the lubricating oil reaches a high level of cleanliness after two-stage filtration, ensuring the lubrication effect of moving parts. When the backwashing system 2 is activated periodically, the filtered clean oil flow backwashes the secondary filter 4, flushing out the impurities trapped in the secondary filter 4 and discharging them to the primary filter 3 for centralized treatment. This achieves the self-cleaning function of the secondary filter element 21 in the secondary filter 4, avoiding the maintenance problems caused by the clogging of the secondary filter element 21 in traditional solutions. Through the oil circuit switching design, the secondary filter element 21 is cleaned using the system's own pressure without adding an additional cleaning device, significantly improving the continuous working capacity of the filtration system. Compared with existing technologies, this solution has the advantages of compact structure, long maintenance cycle, and stable filtration efficiency, and is especially suitable for hybrid gearbox lubrication conditions with high cleanliness requirements.

[0032] In this embodiment, the primary filter 3 is equipped with an impurity separation section, which is used to adsorb and separate impurities in the lubricating oil returning to the oil pan 8. The impurity separation section is located inside the primary filter 3 and is mainly used to analyze the lubricating oil returning to the oil pan 8 after lubrication or backflushing. Since this type of lubricating oil usually contains impurities such as metal particles and alloy debris, the impurity separation section separates and filters these impurities to prevent them from flowing into the oil pan 8. The impurity separation section can use a permanent magnet or electromagnet 24 to achieve the function of magnetically adsorbing metal particles. Alternatively, a sedimentation chamber or sedimentation tank can be used to settle alloy debris that cannot be magnetically adsorbed by gravity. A centrifugal separation structure can also be integrated, using a swirling chamber to deposit metal particles into a collection tank located at the bottom under centrifugal force. This solution effectively traps ferromagnetic wear particles and non-magnetic alloy debris generated during lubricating oil circulation by setting an impurity separation section inside the primary filter 3, preventing them from entering the oil pan 8 and flowing into the secondary filter 4, thereby reducing the risk of clogging of the secondary filter 4. Compared with existing technologies that rely solely on filter screen filtration, magnetic separation can specifically remove metal debris that is most harmful to bearings, while reducing the frequency of cleaning and maintenance. Since the primary filter 3 is located on the return path of the oil pan 8, the impurity separation section can complete preliminary purification before the lubricating oil enters the main circulation, thereby improving the overall filtration efficiency.

[0033] In this embodiment, the primary filter 3 has a primary filter 3 inlet and an oil collection chamber 22 is provided at the primary filter 3 inlet. The oil collection chamber 22 is used to receive lubricating oil after lubrication or backflushing, and to transport the lubricating oil to the impurity separation section inside the primary filter 3 through the primary filter 3 inlet. The primary filter 3 also has a primary filter 3 outlet for transporting lubricating oil to the oil pan 8. As shown in Figure 2, the overall structure of the primary filter 3 includes a shell, an oil collection chamber 22, a primary filter element 26, and an impurity separation section. The shell is provided with a primary filter 3 inlet and a primary filter 3 outlet. The oil collecting chamber 22 is located at the front end of the oil inlet of the primary filter 3 and is used to collect the lubricating oil returning from the lubrication part 9. It can adopt a funnel-shaped structure. The oil inlet of the primary filter 3 can be set as an inclined pipe or a straight pipe structure to promote oil flow. The distance between the impurity separation part and the oil inlet is controlled within the range of 50-100mm to ensure that the oil fully contacts the separation element. The oil outlet of the primary filter 3 is set lower than the oil inlet of the primary filter 3 in the vertical direction. At the same time, the oil outlet of the primary filter 3 adopts a sunken design to form a gravity oil discharge channel, and realizes the oil gravity flow by utilizing the height difference. The overall flow process of the lubricating oil is as follows: after the oil collecting chamber 22 collects the returning oil containing impurities, it is transported to the impurity separation part through the oil inlet of the primary filter 3. After being separated by the impurity separation part, the lubricating oil flows through the primary filter element 26 and finally flows into the oil pan 8 from the oil outlet of the primary filter 3. This structure can effectively solve the oil retention problem of traditional flat filters, effectively improve the separation efficiency of metal impurities, and reduce the delivery energy consumption of the oil pump 10.

[0034] In this embodiment, the impurity separation section includes a magnet 24 and a slag discharge port 27 sequentially arranged in the oil passage 23 inside the primary filter 3 according to the direction of lubricating oil flow. The magnet 24 is used to adsorb magnetic impurities in the lubricating oil, and the slag discharge port 27 is used to discharge impurities that have settled in the oil passage 23. A magnetic drain bolt 25 is provided at the slag discharge port 27 to control the opening and closing of the slag discharge port 27. As shown in Figure 2, the primary filter 3 has an oil passage 23 for lubricating oil flow, and the impurity separation section is arranged on the oil passage 23 and includes a magnet 24. 4. Magnetic metal particles or debris in the lubricating oil can be attracted by magnet 24, while debris that cannot be attracted by magnets can be intercepted by primary filter element 26 and settle in the oil passage 23 between magnet 24 and primary filter element 26 under gravity. Simultaneously, a slag discharge port 27 is provided at the lowest point of the oil passage 23. The slag discharge port 27 can discharge a large amount of impurities without disassembling the primary filter 3. A magnetic drain bolt 25 is correspondingly provided at the slag discharge port 27, and the opening and closing of the slag discharge port 27 is achieved through the magnetic drain bolt 25. Magnet 24 mainly performs initial adsorption of high-concentration metal impurities at the oil inlet. Magnet 24 can be an electromagnet 24 for easy subsequent cleaning. The magnetic drain bolt 25 performs secondary adsorption and purification of the initially filtered lubricating oil and is detachably installed with the outer casing.

[0035] In this embodiment, an oil pump 10 is also included. The oil pump 10 is disposed between the secondary filter 4 and the lubrication part 9 and is used to provide power for the lubrication system 1 and the backflushing system 2. The oil pump 10 is located on the lubrication path between the secondary filter 4 and the lubrication part 9. The oil inlet of the oil pump 10 is connected to the clean oil outlet 6 of the secondary filter 4 through a pipeline, and the oil outlet is connected to the oil storage tanks of the lubrication part and the backflushing system 2 respectively. The oil pump 10 can be a common hydraulic pump type such as a gear pump, vane pump, or piston pump, and can be directly connected to the motor or connected to the engine through a transmission mechanism. This is existing technology and will not be described in detail here. When the system is in lubrication mode, the oil pump 10 delivers lubricating oil to the lubrication part; when the system switches to backflushing mode, the oil pump 10 delivers clean lubricating oil from the oil storage tank to the secondary filter 4 for backflushing. This design avoids the structural complexity caused by setting up a separate backflushing pump, and at the same time reduces the system cost by sharing the oil pump 10.

[0036] In this embodiment, an oil storage chamber 12 is also provided between the oil pump 10 and the lubrication part 9. The oil storage chamber 12 is used to collect a predetermined amount of lubricating oil filtered by the secondary filter 4 in the lubrication system 1 and to provide lubricating oil for backwashing in the backwashing system 2. As shown in Figure 1, a branch is opened on the lubricating oil flow path between the oil pump 10 and the lubrication part 9 and the branch flows to the oil storage chamber 12. The oil storage chamber 12 can be an opening in an external oil reservoir or an opening in an oil tank on the hybrid housing. It is mainly used to collect lubricating oil for backwashing. Since the amount of lubricating oil for backwashing is not much, a portion of the lubricating oil in the normal lubrication system 1 can be diverted to the oil storage chamber 12 to meet the amount of lubricating oil for backwashing. One-way valves can be set at the inlet and outlet of the oil storage component to control the flow direction of the oil. The branch can be closed after the oil storage chamber 12 reaches the predetermined amount. Whether the predetermined amount meets the usage requirements can be monitored by setting an oil level sensor. When the system switches to backflushing mode, the clean lubricating oil pre-stored in the oil reservoir is pressurized by the oil pump 10 and enters the clean oil outlet 6 of the secondary filter 4 through the sixth control valve 18, forming a backflushing flow path. This solves the problem of incomplete flushing caused by the lack of an independent oil source in traditional systems, while also preventing the backflushing process from affecting the oil pressure stability of the main lubrication system 1. Compared with the scheme of directly using the oil circuit of the lubrication system 1 for backflushing, this design can ensure the cleanliness of the flushing oil and effectively isolate the hydraulic interference between the two operating conditions through the buffering effect of the oil reservoir.

[0037] In this embodiment, the secondary filter 4 includes a secondary filter housing 20 and a secondary filter element 21. The secondary filter housing 20 has a secondary filter inlet 5. The secondary filter inlet 5, the secondary filter element 21, and the clean oil outlet 6 form a filtration channel within the secondary filter 4. The clean oil outlet 6, the secondary filter element 21, and the sewage outlet 7 form a backwashing channel. The secondary filter housing 20 is made of cast aluminum alloy and has internal supporting ribs to maintain structural strength. The secondary filter element 21 can be fixed inside the housing by snap-fit. This solution integrates the filtration channel and the backwashing channel into the same secondary filter 4, achieving both circulating filtration of lubricating oil and self-cleaning of the secondary filter element 21. The filtration channel is used for oil filtration under normal lubrication conditions, while the backwashing channel can be activated periodically to remove impurities accumulated on the surface of the secondary filter element 21 using the reverse-flowing lubricating oil. This ensures a continuous and clean supply of lubricating oil while avoiding the need to stop the machine to replace the filter element in traditional designs. The dual-channel design eliminates the need for additional filtration devices during the backwashing process, allowing impurities to be directly discharged into the primary filter 3 for secondary treatment. This effectively solves the problem of poor lubrication caused by filter element blockage after long-term operation of the mixing box, extends the service life of the filter element, and maintains the filtration efficiency of the system.

[0038] In this embodiment, the lubrication system 1 further includes a first valve assembly arranged sequentially along the lubrication flow path and used to control the opening and closing of the lubrication system 1, and a second valve assembly arranged sequentially along the backwash flow path and used to control the opening and closing of the backwash system 2.

[0039] The first valve assembly includes a first control valve 13 disposed between the oil pan 8 and the oil inlet 5 of the secondary filter, a second control valve 14 disposed between the clean oil outlet 6 of the secondary filter 4 and the oil inlet of the oil pump 10, a third control valve 15 disposed between the oil outlet of the oil pump 10 and the lubrication part 9, and a fourth control valve 16 disposed between the oil outlet of the oil pump 10 and the oil storage chamber 12.

[0040] The second valve assembly includes a fifth control valve 17 disposed between the oil storage chamber 12 and the oil pump 10 inlet, a sixth control valve 18 spanning the second control valve 14 and the oil pump 10 and disposed between the oil pump 10 outlet and the clean oil outlet 6 of the secondary filter 4, and a seventh control valve 19 disposed between the secondary filter 4 drain outlet 7 and the primary filter 3.

[0041] Through the coordinated control between the first valve assembly and the second valve assembly, the lubrication system 1 can achieve rapid switching of operating modes and precise flow distribution. As shown in Figure 1, the first control valve 13 is mainly used to control the opening and closing of the lubricating oil flow path between the oil pan 8 and the oil inlet 5 of the secondary filter; the second control valve 14 is mainly used to control the opening and closing of the lubricating oil flow path between the clean oil outlet 6 of the secondary filter 4 and the oil inlet of the oil pump 10; the third control valve 15 is mainly used to control the opening and closing of the lubricating oil flow path between the oil outlet of the oil pump 10 and the lubrication part 9; the fourth control valve 16 is mainly used to control the opening and closing of the lubricating oil flow path between the oil outlet of the oil pump 10 and the oil storage chamber 12; the fifth control valve 17 is mainly used to control the opening and closing of the lubricating oil flow path between the oil storage chamber 12 and the oil inlet of the oil pump 10; the sixth control valve 18 is set across the second control valve 14 and the oil pump 10 and is mainly used to control the opening and closing of the lubricating oil flow path between the oil outlet of the oil pump 10 and the clean oil outlet 6 of the secondary filter 4; and the seventh control valve 19 is mainly used to control the opening and closing of the lubricating oil flow path between the drain outlet 7 of the secondary filter 4 and the primary filter 3.

[0042] Specifically, referring to Figures 1, 3, and 4, when the second valve assembly is completely closed, the first control valve 13, the second control valve 14, the third control valve 15, and the fourth control valve 16 are in the open state. At this time, the lubricating oil in the oil pan 8 flows sequentially through the first control valve 13, the secondary filter 4, the second control valve 14, and the oil pump 10. After flowing out of the oil pump 10 outlet, part of it flows to the third control valve 15 and finally to the lubrication part 9, while the other part flows to the fourth control valve 16 and finally to the oil storage chamber 12. When the oil storage chamber 12 reaches the predetermined oil storage volume, the fourth control valve 16 closes, and the system is in normal lubrication state. When maintenance is required (i.e., backflushing the secondary filter 4), the first valve assembly is completely closed, and the fifth control valve 17, the sixth control valve 18, and the seventh control valve 19 are in the open state. At this time, the lubricating oil in the oil storage chamber 12 flows sequentially through the fifth control valve 17, the oil pump 10, the sixth control valve 18, the secondary filter, and the seventh control valve 19, and finally flows into the primary filter 3. When the backwashing system 2 is in operation, the lubricating oil used for backwashing flows back into the secondary filter 4 from the clean oil outlet 6 of the secondary filter 4, and flows out from the sewage outlet 7 through the filtration channel, thereby realizing the backwashing of the secondary filter element 21.

[0043] In this embodiment, an electronic controller 11 is also included. The electronic controller 11 is used to control the opening and closing of the oil pump 10 and the valve assembly. The electronic controller 11 can be implemented using a PLC controller or an embedded microprocessor. It adjusts the speed of the oil pump 10 by receiving sensor signals (such as oil pressure sensors and flow sensors) to dynamically adjust the pumping flow rate. The opening and closing control of the valve assembly can be achieved through relays or solenoid valve drive circuits, for example, using PWM signals to control the opening degree of the solenoid valve. The electronic controller 11 achieves precise switching between the lubrication system 1 and the backflushing system 2 by coordinating the actions of the oil pump 10 and the valve assembly. In lubrication mode, the electronic controller 11 controls the first valve assembly to open and adjusts the flow rate of the oil pump 10 to ensure that the lubricating oil is delivered to the lubrication part 9 at a constant pressure. In backflushing mode, the electronic controller 11 closes the first valve assembly and starts the second valve assembly, while increasing the speed of the oil pump 10 to enhance the flushing pressure. Thus, normal lubrication needs can be maintained, and impurities in the secondary filter element 21 can be removed through timed backflushing, avoiding the problem of oil pressure drop caused by filter element blockage. Meanwhile, the electronic controller 11 can also integrate fault diagnosis function. When oil circuit blockage or valve abnormality is detected, it will automatically switch to backwash mode. Compared with the existing technology, this solution reduces the need for manual intervention through automated control, and extends the service life of the filter element by dynamically adjusting the pumping parameters, thus solving the technical defect that traditional valve plate filtration systems cannot be maintained online.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hybrid gearbox lubricating oil filtration system, characterized in that: The system includes a lubrication system for delivering lubricating oil to lubrication points. The lubrication system includes a primary filter and a secondary filter. The primary filter filters the lubricating oil after lubrication and delivers it to the oil pan. The secondary filter filters the lubricating oil delivered from the oil pan to the lubrication points. The system also includes a backflushing system that can be switched with the lubrication system. The backflushing system delivers the lubricating oil filtered by the secondary filter back to the clean oil outlet of the secondary filter to backflush the interior of the secondary filter, and discharges the backflushed lubricating oil from the drain outlet of the secondary filter back to the primary filter.

2. The hybrid gearbox lubricating oil filtration system according to claim 1, characterized in that: The primary filter is equipped with an impurity separation section, which is used to adsorb and separate impurities in the lubricating oil that flows back to the oil pan.

3. The hybrid gearbox lubricating oil filtration system according to claim 2, characterized in that: The primary filter has a primary filter inlet and an oil collection chamber at the primary filter inlet. The oil collection chamber is used to receive lubricating oil after lubrication or backflushing, and to transport the lubricating oil to the impurity separation section inside the primary filter through the primary filter inlet. The primary filter also has a primary filter outlet to transport the lubricating oil to the oil pan.

4. The hybrid gearbox lubricating oil filtration system according to claim 3, characterized in that: The impurity separation section includes a magnet and a slag discharge port arranged sequentially in the oil passage inside the primary filter in the direction of lubricating oil flow. The magnet is used to adsorb magnetic impurities in the lubricating oil, and the slag discharge port is used to discharge impurities that have settled in the oil passage.

5. The hybrid gearbox lubricating oil filtration system according to claim 4, characterized in that: The slag discharge port is equipped with a magnetic oil discharge bolt for controlling the opening and closing of the slag discharge port.

6. The hybrid gearbox lubricating oil filtration system according to claim 1, characterized in that: It also includes an oil pump, which is located between the secondary filter and the lubrication point and is used to provide power for pumping lubricating oil to the lubrication system and the backflushing system.

7. The hybrid gearbox lubricating oil filtration system according to claim 6, characterized in that: It also includes an oil reservoir located between the oil pump and the lubrication part, the oil reservoir being used to collect a predetermined amount of lubricating oil filtered by a secondary filter in the lubrication system and to provide lubricating oil for backflushing in the backflushing system.

8. The hybrid gearbox lubricating oil filtration system according to claim 7, characterized in that: The secondary filter includes a secondary filter housing and a secondary filter element. The secondary filter housing has a secondary filter inlet. The secondary filter inlet, the secondary filter element, and the clean oil outlet form a filtration channel within the secondary filter. The clean oil outlet, the secondary filter element, and the sewage outlet form a backwashing channel.

9. The hybrid gearbox lubricating oil filtration system according to claim 8, characterized in that: The lubrication system further includes a first valve assembly arranged sequentially along the lubrication flow path and used to control the opening and closing of the lubrication system, and a second valve assembly arranged sequentially along the backflushing flow path and used to control the opening and closing of the backflushing system; the first valve assembly includes a first control valve disposed between the oil pan and the oil inlet of the secondary filter, a second control valve disposed between the clean oil outlet of the secondary filter and the oil pump inlet, a third control valve disposed between the oil pump outlet and the lubrication part, and a fourth control valve disposed between the oil pump outlet and the oil storage chamber; the second valve assembly includes a fifth control valve disposed between the oil storage chamber and the oil pump inlet, a sixth control valve spanning the second control valve and the oil pump and disposed between the oil pump outlet and the clean oil outlet of the secondary filter, and a seventh control valve disposed between the wastewater outlet of the secondary filter and the primary filter.

10. The hybrid gearbox lubricating oil filtration system according to claim 9, characterized in that: It also includes an electronic controller for controlling the opening and closing of the oil pump and valve assembly.

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