Dry and wet dual-purpose oil pan lubricating system, application thereof and aircraft

Abstract

The invention discloses a dry and wet dual-purpose oil pan lubricating system, application thereof and an aircraft, and relates to the technical field of engines. The wet type oil pan lubricating system of the original automobile engine is modified, and a set of dry type oil pan lubricating system is added on the basis of the wet type oil pan of the automobile engine to form the wet and dry dual-purpose oil pan lubricating system. The problem that the maximum flight attitude angle of an aircraft cannot be met after a wet-type oil pan lubricating system of an existing automobile engine is used for the aircraft is solved, meanwhile, related parts of an original automobile engine lubricating system can be reserved to the maximum extent, and therefore the remanufacturing cost of remanufacturing the automobile engine into an aero-engine is reduced. According to the modified dry and wet dual-purpose oil pan lubricating system, a dry lubricating system and a wet lubricating system can be switched according to the flight attitude angle of an aircraft, an electric signal indicating whether an electromagnetic clutch is attracted or not directly comes from an engine oil pressure sensor on an original automobile engine, the dry lubricating system and the wet lubricating system are switched automatically, and no special control system is needed for control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, in particular to a dry-wet dual-purpose oil sump lubrication system and application thereof and an aircraft. BACKGROUND

[0002] In order to reduce procurement costs, an aircraft can use a mature automobile engine to be modified into an aircraft engine. However, most automobile engines use a wet oil sump lubrication system. The wet oil sump has the advantages of simple structure, low cost, high lubrication efficiency and convenient maintenance, but has the defect of insufficient oil supply under extreme conditions, especially for the application of modifying an automobile engine into an aircraft engine. During flight, the aircraft has a large pitch angle, roll angle and yaw angle, which can exceed the maximum inclination angle allowed by the wet oil sump lubrication system. In addition, the aircraft can also bear a large acceleration during aerobatics and full acceleration, which further affects the oil level angle inside the wet oil sump, and in extreme cases, can also cause air suction, at which time the defect of insufficient oil supply occurs. When the engine has insufficient oil supply, it is easy to cause the wear of mechanical parts to be intensified, and in severe cases, can cause the engine bearing to seize, resulting in a serious failure of the engine, which directly affects the flight safety of the aircraft. Although the dry oil sump lubrication system can avoid the problem of insufficient oil supply of the engine, the dry oil sump lubrication system has a complex structure and high cost, and is not suitable for the application of modifying an automobile engine into an aircraft engine.

[0003] Therefore, the present application provides a dry-wet dual-purpose oil sump lubrication system to solve the problem that the wet oil sump lubrication system of the existing automobile engine does not meet the maximum flight attitude angle of the aircraft after being modified for the aircraft, and the traditional dry oil sump lubrication system used for the aircraft has a high cost. SUMMARY

[0004] The purpose of the present application is to provide a dry-wet dual-purpose oil sump lubrication system and application thereof and an aircraft, which can reduce the modification cost of the aircraft engine and meet the use requirements of the aircraft, so as to solve the problems existing in the prior art.

[0005] To achieve the above purpose, the present application provides the following solutions. In one aspect, the present application provides a dry-wet dual-purpose oil sump lubrication system, comprising: An oil pump set comprising an oil pump one and an oil pump two; A wet sump lubrication system, comprising an engine, a wet sump and an oil pressure sensor, the engine is an automobile engine, an internal lubricating oil passage of the engine is connected with the wet sump through a first oil pump, the first oil pump is used for pumping the internal lubricating oil in the wet sump to the engine, the oil pressure sensor is connected to the lubricating oil passage at an output end of the first oil pump, and is used for detecting the oil pressure at the output end of the first oil pump. An electromagnetic clutch is connected with a power output end of the second oil pump, the second oil pump is connected with the internal lubricating oil passage of the engine, the electromagnetic clutch is electrically connected with the oil pressure sensor, when the oil pressure sensor detects that the oil pressure is lower than a threshold value or no oil pressure, the electromagnetic clutch is attracted and drives the second oil pump to operate, so as to pump the external lubricating oil to the internal lubricating oil passage of the engine through the second oil pump, when the oil pressure sensor detects that the oil pressure reaches the threshold value, the electromagnetic clutch is disconnected and the second oil pump is closed, so as to pump the internal lubricating oil in the wet sump to the internal lubricating oil passage of the engine through the first oil pump.

[0006] In some embodiments, the oil pressure sensor is a diaphragm switch type pressure sensor, when the oil pressure sensor detects that the oil pressure is lower than a threshold value or no oil pressure, a spring in the diaphragm switch type pressure sensor pushes a diaphragm, so that a contact is kept in a closed state, so as to connect a circuit between the oil pressure sensor and the electromagnetic clutch and control the electromagnetic clutch to be attracted, when the oil pressure sensor detects that the oil pressure reaches the threshold value, the diaphragm in the diaphragm switch type pressure sensor overcomes the spring pushing force under the action of the oil pressure, so that the contact is opened, so as to disconnect the circuit between the oil pressure sensor and the electromagnetic clutch and control the electromagnetic clutch to be disconnected.

[0007] In some embodiments, a crankshaft pulley is further connected with the crankshaft of the engine, the crankshaft pulley is in driving connection with the electromagnetic clutch through a transmission belt or a transmission chain, so as to drive the electromagnetic clutch to rotate through the crankshaft pulley when the engine is started.

[0008] In some embodiments, the dry-wet dual-purpose sump lubrication system further comprises an oil filter adapter and an oil filter for pre-filtering lubricating oil, wherein: An oil inlet of the oil filter is connected with an oil outlet of the first oil pump through an oil inlet oil passage in the oil filter adapter; An oil outlet of the oil filter is connected with the internal lubricating oil passage of the engine through an oil outlet oil passage in the oil filter adapter.

[0009] In some embodiments, the oil filter adapter further comprises an oil inlet branch connected in parallel with the oil inlet channel, and the second oil pump is connected to the oil inlet branch, the oil filter and the internal lubricating channel of the engine in sequence.

[0010] In some embodiments, a one-way valve one is further connected between the second oil pump and the oil inlet branch to prevent lubricating oil entering the oil filter adapter through the first oil pump from flowing to the second oil pump. A one-way valve two is further connected between the first oil pump and the oil inlet channel to prevent lubricating oil entering the oil filter adapter through the second oil pump from flowing to the first oil pump in reverse.

[0011] In some embodiments, the dry-wet sump lubrication system further comprises an oil storage tank, and the second oil pump is connected to the oil storage tank, and the oil storage tank can provide lubricating oil for the second oil pump.

[0012] In some embodiments, the bottom of the wet sump is provided with a drain port, and the oil pump group further comprises a third oil pump connected between the drain port and the oil storage tank, and the third oil pump can pump lubricating oil discharged from the drain port to the oil storage tank.

[0013] In another aspect, the application provides the use of the dry-wet sump lubrication system as a lubrication system in an automobile or aviation internal combustion engine.

[0014] In another aspect, the application provides an aircraft comprising the dry-wet sump lubrication system according to any one of the above.

[0015] The application has the following technical effects compared with the prior art: The dry-wet sump lubrication system of the application is improved based on the original wet sump lubrication system of an automobile engine, and a dry sump lubrication system is added to the wet sump lubrication system of the automobile engine to form a dry-wet sump lubrication system. The dry-wet sump lubrication system not only solves the problem that the wet sump lubrication system of the existing automobile engine cannot meet the maximum flight attitude angle of an aircraft, but also maximizes the retention of related parts of the original automobile engine lubrication system to reduce the modification cost of modifying the automobile engine into an aviation engine.

[0016] The improved dry-wet dual-purpose oil sump lubrication system can lubricate the related parts of the engine by using the original wet oil sump lubrication system of the automobile engine when the aircraft flight attitude angle is not more than the maximum inclination angle allowed by the wet oil sump lubrication system, and can automatically start the dry oil sump lubrication system related parts to lubricate the related parts of the engine when the aircraft flight attitude angle does not meet (exceeds) the maximum inclination angle allowed by the wet oil sump lubrication system. The dry-wet dual-purpose oil sump lubrication system is flexible in switching between the two lubrication systems and can meet the use requirements of the aircraft in different flight states.

[0017] The electric signal of whether the electromagnetic clutch of the dry-wet dual-purpose oil sump lubrication system of the application is attracted directly comes from the oil pressure sensor on the original automobile engine, the switching of the dry-wet lubrication system is automatically performed, and a special control system is not needed for control, thereby having the advantages of simplified structure and low manufacturing cost.

[0018] The dry-wet dual-purpose oil sump lubrication system described above is mainly applied in automobile or aviation internal combustion engines. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0020] Figure 1 The overall structure schematic diagram of the dry-wet dual-purpose oil sump lubrication system disclosed in the embodiments of the application.

[0021] Figure 2 The internal oil passage and oil flow direction of the oil filter adapter disclosed in the embodiments of the application.

[0022] In the figure: 100-dry-wet dual-purpose oil sump lubrication system; 101-wet oil sump lubrication system; 102-dry oil sump lubrication system; 1-engine; 2-oil pressure sensor; 3-crankshaft pulley; 4-electromagnetic clutch; 5-wet oil sump; 6-drain port; 7-oil pump one; 8-oil filter adapter; 81-oil inlet one; 82-oil inlet two; 83-oil outlet one; 84-oil inlet three; 85-oil outlet two; 9-oil filter; 10-oil pump two; 11-oil pump three; 12-oil storage tank; 13-one-way valve one; 14-one-way valve two. DETAILED DESCRIPTION

[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] One of the objectives of this invention is to provide a dual-purpose wet and dry sump lubrication system that can reduce the modification cost of aircraft engines while meeting the usage requirements of aircraft. This solves the problem that existing wet sump lubrication systems for automobile engines, when modified for aircraft, do not meet the maximum flight attitude angle of aircraft, while using traditional dry sump lubrication systems for aircraft is too costly.

[0025] Another object of the present invention is to provide an application of the above-mentioned dry and wet dual-purpose oil pan lubrication system in automobile or aviation internal combustion engines.

[0026] Another object of the present invention is to provide an aircraft employing the above-described dry and wet dual-purpose oil pan lubrication system.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1 like Figure 1 As shown, this embodiment provides a dry and wet dual-purpose oil pan lubrication system 100, which mainly includes an engine 1, an oil pressure sensor 2, an electromagnetic clutch 4, a wet oil pan 5, and an oil pump assembly.

[0029] Engine 1 is a car engine. Its internal lubrication channels are connected to the wet oil pan 5 via oil passages. The lubricating oil inside the lubrication channels flows back to the wet oil pan 5 under the influence of gravity after passing through the various lubricated components. The bottom of the wet oil pan 5 is equipped with a drain port 6, through which the engine oil is drained when engine 1 requires maintenance. The wet oil pan 5 is a common mechanism in engine technology; its specific structure and working principle will not be described in detail here.

[0030] like Figure 1 As shown, the oil pump assembly includes three oil pumps: oil pump 7, oil pump 10, and oil pump 11. Oil pump 7 is connected between the wet oil pan 5 and the engine 1. Oil pump 7 is used to draw lubricating oil from inside the wet oil pan 5 and pump it to the parts inside the engine 1 that require lubrication. Oil pump 7 is usually the original oil pump of the engine 1.

[0031] To prevent impurities in the lubricating oil from affecting the performance of engine 1, this embodiment also includes an oil filter 9 installed between the oil pump 7 and engine 1. Figure 1 As shown, the inlet of oil filter 9 is connected to the outlet of oil pump 7 via the inlet oil passage in oil filter adapter 8, and the outlet of oil filter 9 is connected to the internal lubrication passage of engine 1 via the outlet oil passage in oil filter adapter 8. After oil pump 7 draws lubricating oil from the wet oil pan 5, the lubricating oil enters oil filter 9 through the inlet oil passage of oil filter adapter 8. After being filtered by oil filter 9, the lubricating oil enters the engine 1 through the outlet oil passage of oil filter adapter 8 and reaches the parts that need lubrication. Figure 2 As shown, the oil inlet of the oil filter adapter 8 has an inlet port 81 and an outlet port 83 at both ends, and an outlet port 84 and an outlet port 85 at both ends. The inlet port 81 and the outlet port 85 are connected to the outlet of the oil pump 7 and the engine 1, respectively, while the outlet port 83 and the inlet port 84 are connected to the inlet and outlet of the oil filter 9, respectively.

[0032] An oil pressure sensor 2 is installed on the lubrication passage at the output end of oil pump 7. The oil pressure sensor 2 is used to detect the oil pressure at the output end of oil pump 7. Simultaneously, the crankshaft pulley 3 at the front end of engine 1 is mechanically connected to the crankshaft of engine 1. Normally, crankshaft pulley 3 is directly fixed to the crankshaft of engine 1 with bolts. When engine 1 is running, the crankshaft of engine 1 will drive crankshaft pulley 3 to rotate directly. Crankshaft pulley 3 and electromagnetic clutch 4 are connected by a transmission mechanism including but not limited to a drive belt or drive chain. When crankshaft pulley 3 rotates, it can drive electromagnetic clutch 4 to rotate via the drive belt or drive chain. Oil pressure sensor 2 is electrically connected to electromagnetic clutch 4. Both crankshaft pulley 3 and electromagnetic clutch 4 are common mechanisms; their specific structures and working principles will not be described in detail here.

[0033] The output end of the electromagnetic clutch 4 is sequentially connected to oil pump 2 10 and oil pump 3 11. Specifically, the power input end of oil pump 2 10 is connected to the electromagnetic clutch 4 via a drive shaft, and the power input end of oil pump 3 11 is connected to the power output end of oil pump 2 1 via a drive shaft or gear transmission mechanism. When oil pump 2 10 rotates under the drive of the electromagnetic clutch 4, it will drive oil pump 3 11 to rotate simultaneously. In practical applications, if the power input end of oil pump 3 11 is connected to the power output end of oil pump 2 1 via a drive shaft, the drive shaft is a rigid shaft, and both ends of the rigid shaft are connected to the power input end of oil pump 3 11 and the power output end of oil pump 2 1 respectively via couplings; if a gear transmission mechanism is used, the gear transmission mechanism may include a driving gear and a driven gear meshing with the driving gear, and the driving gear and the driven gear are respectively keyed to the power input end of oil pump 3 11 and the power output end of oil pump 2 1.

[0034] The oil inlet of oil pump 2 10 is connected to oil reservoir 12, and the oil outlet of oil pump 2 10 is connected to the oil inlet branch of oil filter adapter 8. This oil inlet branch is connected in parallel to the aforementioned oil inlet line of oil filter adapter 8. Specifically, as shown... Figure 2 As shown, the oil inlet of this oil inlet branch is oil inlet 82, and the oil outlet of this oil inlet branch is connected between oil inlet 81 and oil outlet 83 of the oil inlet circuit in the oil filter adapter 8. The oil inlet of oil pump 3 11 is connected to the aforementioned drain port 6 through an oil circuit, and the oil outlet of oil pump 3 11 is connected to the aforementioned oil reservoir 12 through an oil circuit. Thus, the drain port 6, oil pump 3 11, oil reservoir 12, oil pump 2 10, and oil filter adapter 8 are sequentially connected by oil circuits to form a replenishment oil circuit to the engine 1, so as to supply oil to the engine 1 when the oil pressure at the output end of oil pump 7 is lower than the threshold or there is no oil pressure, thereby increasing the oil flow and oil pressure in the internal lubrication oil passages of the engine 1.

[0035] The aforementioned dual-purpose wet and dry oil pan lubrication system 100 mainly includes a wet oil pan lubrication system 101 and a dry oil pan lubrication system 102, such as... Figure 1 As shown, engine 1, oil pressure sensor 2, wet oil pan 5, oil pump 1 7, oil filter adapter 8 and oil filter 9 are the relevant components of wet oil pan lubrication system 101, while electromagnetic clutch 4, oil pump 3 11, oil reservoir 12 and oil pump 2 10 are the relevant components of dry oil pan lubrication system 102.

[0036] Oil pressure sensor 2 includes, but is not limited to, existing diaphragm switch type pressure sensors. When the aircraft is in flight, if the pitch angle, roll angle, and yaw angle exceed the maximum allowable tilt angle of the wet sump lubrication system 5, it will cause the oil pump 7 to cavitate, resulting in insufficient oil flow in the lubrication passages. When oil pressure sensor 2 detects that the oil pressure in the lubrication passages is below the threshold or there is no oil pressure, the spring inside oil pressure sensor 2 will push the diaphragm to keep the contacts closed. At this time, the circuit connection between oil pressure sensor 2 and electromagnetic clutch 4 is connected and current is conducted, thereby controlling the electromagnetic clutch 4 to engage. At this time, electromagnetic clutch 4 drives oil pump 10 to rotate, so as to pump the lubrication oil inside the oil reservoir 12 to the oil filter adapter 8, which is filtered by oil filter 9 and then flows to engine 1, thereby increasing the oil flow and oil pressure in the lubrication passages inside engine 1. This is the working mechanism of the dry sump lubrication system. When the oil flow in the lubrication passages of engine 1 is sufficient, the oil pressure in the lubrication passages is high. When the oil pressure sensor 2 detects that the oil pressure in the lubrication passages reaches (not lower than) the threshold, the diaphragm inside the oil pressure sensor 2 will overcome the spring's thrust under the oil pressure, and the contacts will open accordingly. This disconnects the circuit between the oil pressure sensor 2 and the electromagnetic clutch 4, interrupts the current, and the electromagnetic clutch 4 disengages. At this time, the electromagnetic clutch 4 does not drive the oil pump 10 to rotate, and the oil pump 10 is turned off. At this time, the wet sump lubrication system 101 in the dry and wet dual-purpose sump lubrication system 100 operates based on the working mechanism of a conventional wet sump lubrication system.

[0037] It should be noted that, in order to ensure the "dry and wet dual-use" nature of the dry and wet dual-use oil pan lubrication system 100, the oil tank 12 generally stores an appropriate amount of engine oil. This engine oil can be supplied solely through the drain port 6, or it can be added by the staff based on the working requirements of the dry oil pan lubrication system 102, in addition to the oil supplied through the drain port 6.

[0038] The oil filter adapter 8 used on the engine 1 of a traditional car only has four oil passage interfaces, that is, Figure 2 The diagram shows an oil inlet 81, an oil outlet 83, an oil inlet 84, and an oil outlet 85. Oil inlet 81 connects to oil pump 7, oil outlets 83 and 84 connect to oil filter 9, and oil outlet 85 connects to engine 1. The oil filter adapter 8 in this system has an additional oil passage interface, oil inlet 82, for connecting to oil pump 10. This adds an oil inlet branch inside the oil filter adapter 8. When oil pump 10 is working, lubricating oil is supplied to engine 1 through oil inlet 82 for lubrication. The internal oil passages and oil flow direction of the oil filter adapter 8 are shown in the diagram. Figure 2 (As shown by the middle arrow) Figure 2As shown, the lubricating oil flows in from the oil inlet 81 or the oil inlet 82, then flows through the oil outlet 83 to the oil filter 9. After being filtered by the oil filter 9, it flows back to the oil inlet 84 and finally flows through the oil outlet 85 into the engine 1 to participate in lubrication.

[0039] To prevent lubricating oil pumped by oil pump 7 from flowing to oil pump 10 via oil filter adapter 8, this system also includes a one-way valve 13 in the oil path from oil pump 10 to oil filter adapter 8. This ensures that the lubricating oil flow between oil pump 10 and oil filter adapter 8 is solely from oil pump 10 to oil inlet 82. Simultaneously, to prevent backflow of oil from oil filter adapter 8 to oil pump 7, this system also includes a one-way valve 14 in the oil path from oil pump 7 to oil filter adapter 8.

[0040] One of the factors contributing to the higher cost of existing aircraft engines compared to automotive engines is the prevalence of dry sump lubrication systems in aircraft engines. However, dry sump lubrication systems are structurally more complex than wet sump lubrication systems, resulting in higher costs. To fully utilize the cost advantages of existing automotive engines, this invention modifies the wet sump lubrication system of an automotive engine to create a dual-purpose dry / wet sump lubrication system. This system retains the original structure of the wet sump lubrication system while adding a dry sump lubrication system. The modified dual-purpose system can switch between the two lubrication systems based on the aircraft's flight attitude angle, offering flexible switching to meet the operational needs of the aircraft under different conditions while significantly reducing the modification cost of the aircraft engine. When applied to an aircraft, the aforementioned dual-purpose dry / wet sump lubrication system 100 operates under the control of the aircraft's main control system.

[0041] The main advantage of this system is that it is modified from the wet oil pan 5 lubrication system of the original automobile engine 1. Based on the wet oil pan 5 of automobile engine 1, relevant components are added to form a dry and wet dual-purpose oil pan lubrication system. This can retain the relevant components of the original automobile engine 1 lubrication system to the greatest extent, thereby reducing the modification cost of automobile engine 1 to aircraft engine 1.

[0042] The modified dry and wet dual-purpose oil pan lubrication system 100 can lubricate the relevant components of the engine 1 using the original wet oil pan lubrication system 101 when the aircraft's flight attitude angle does not exceed the maximum tilt angle allowed by the wet oil pan lubrication system 5. Alternatively, it can automatically activate the relevant components of the added dry oil pan lubrication system 102 to lubricate the relevant components of the engine 1 when the aircraft's flight attitude angle does not meet (exceeds) the maximum tilt angle allowed by the wet oil pan lubrication system 5.

[0043] In the dual-purpose dry and wet oil pan lubrication system 100, the electrical signal indicating whether the electromagnetic clutch 4 is engaged comes directly from the oil pressure sensor 2 on the original car engine 1. The switching between dry and wet lubrication systems is automatic and does not require a dedicated control system.

[0044] This system is mainly used in automobiles or aircraft internal combustion engines.

[0045] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and objectives of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0046] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A dual-purpose (dry and wet) oil pan lubrication system, characterized in that, include: Oil pump assembly, including oil pump one and oil pump two; A wet sump lubrication system includes an engine, a wet sump, and an oil pressure sensor. The engine is a car engine, and its internal lubricating oil passage is connected to the wet sump via an oil pump. The oil pump pump delivers lubricating oil from the wet sump to the engine. The oil pressure sensor is connected to the lubricating oil passage at the output end of the oil pump pump and is used to detect the oil pressure at the output end of the oil pump pump. An electromagnetic clutch is provided, with its power output end connected to the second oil pump, which is connected to the internal lubrication passage of the engine. The electromagnetic clutch is also electrically connected to the oil pressure sensor. When the oil pressure sensor detects that the oil pressure is below a threshold or there is no oil pressure, the electromagnetic clutch engages and drives the second oil pump to operate, thereby pumping external lubricating oil to the internal lubrication passage of the engine. When the oil pressure sensor detects that the oil pressure reaches the threshold, the electromagnetic clutch disengages and shuts off the second oil pump, thereby pumping the lubricating oil from the wet oil pan to the internal lubrication passage of the engine through the first oil pump.

2. The dual-purpose dry and wet oil pan lubrication system according to claim 1, characterized in that, The oil pressure sensor is a diaphragm switch type pressure sensor. When the oil pressure sensor detects that the oil pressure is below the threshold or there is no oil pressure, the spring inside the diaphragm switch type pressure sensor pushes the diaphragm to keep the contacts closed, thereby connecting the circuit between the oil pressure sensor and the electromagnetic clutch and controlling the electromagnetic clutch to engage. When the oil pressure sensor detects that the oil pressure reaches the threshold, the diaphragm inside the diaphragm switch type pressure sensor overcomes the spring force under the action of oil pressure, causing the contacts to open, thereby disconnecting the circuit between the oil pressure sensor and the electromagnetic clutch and controlling the electromagnetic clutch to disengage.

3. The dry / wet dual-purpose oil pan lubrication system according to claim 1 or 2, characterized in that, The crankshaft of the engine is also connected to a crankshaft pulley, which is connected to the electromagnetic clutch via a drive belt or drive chain, so that when the engine is started, the electromagnetic clutch is driven to rotate by the crankshaft pulley.

4. The dry / wet dual-purpose oil pan lubrication system according to claim 1 or 2, characterized in that, It also includes an oil filter adapter and an oil filter for pre-filtering lubricating oil, wherein: The oil inlet of the oil filter is connected to the oil outlet of the oil pump through the oil inlet passage in the oil filter adapter; The oil outlet of the oil filter is connected to the internal lubrication circuit of the engine through the oil outlet passage in the oil filter adapter.

5. The dual-purpose dry and wet oil pan lubrication system according to claim 4, characterized in that, The oil filter adapter also includes an oil inlet branch connected in parallel with its oil inlet circuit. The second oil pump is connected to the internal lubrication circuit of the engine in sequence through the oil inlet branch and the oil filter.

6. The dry / wet dual-purpose oil pan lubrication system according to claim 5, characterized in that, A one-way valve is also connected between the second oil pump and the oil inlet branch to prevent the lubricating oil that enters the oil filter adapter through the first oil pump from flowing to the second oil pump. A one-way valve is also connected between the oil pump and the oil inlet circuit to prevent the lubricating oil that enters the oil filter adapter through the oil pump from flowing back to the oil pump.

7. The dual-purpose dry and wet oil pan lubrication system according to claim 5, characterized in that, It also includes an oil reservoir, and the second oil pump is connected to the oil reservoir, which can provide lubrication for the second oil pump.

8. The dual-purpose dry and wet oil pan lubrication system according to claim 7, characterized in that, The bottom of the wet oil pan is provided with an oil drain port; the oil pump assembly also includes an oil pump three, which is connected between the oil drain port and the oil storage tank, and the oil pump three can pump the lubricating oil discharged from the oil drain port to the oil storage tank.

9. The application of the dry / wet dual-purpose oil pan lubrication system according to any one of claims 1 to 8 as a lubrication system in automobile or aviation internal combustion engines.

10. An aircraft, characterized in that, Includes the dry and wet dual-purpose oil pan lubrication system as described in any one of claims 1 to 8.

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