Two-stroke engine

Abstract

The present application provides a two-stroke engine, including a compression cylinder, a motion mechanism, a lubricating oil injection device and an oil-gas separator. The compression cylinder includes a cylinder body and a scavenging duct connected to the cylinder body, and the cylinder body is provided with an air inlet and an exhaust port. The scavenging duct includes a first port and a second port that are connected, and the first port is connected to the air inlet. The motion mechanism is movably arranged in the cylinder body. When the motion mechanism is in a first position, the exhaust port and the second port are blocked; when the motion mechanism is in a second position, the exhaust port and the first port are connected. The lubricating oil injection device is used to inject lubricating oil to the motion mechanism. The oil-gas separator is arranged in the scavenging duct, and is used to separate the lubricating oil and gas passing through the first port. The oil-gas separator can separate the lubricating oil and the gas, thereby avoiding the lubricating oil from being burned and consumed, thereby reducing the consumption of the lubricating oil.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a two-stroke engine. Background Art

[0002] Two-stroke engines are widely used in general aviation, general machinery, and automobiles due to their high power density, simple structure, and high power-to-weight ratio. The lubricating oil used to lubricate the moving mechanism of some two-stroke engines will enter the scavenging passage along with the gas from the air intake and be burned together with the fuel. This setting causes excessive consumption of lubricating oil, resulting in a waste of resources. Summary of the invention

[0003] The present application provides a two-stroke engine, which reduces the consumption of lubricating oil.

[0004] The present application provides a two-stroke engine, comprising:

[0005] A compression cylinder comprises a cylinder body and a scavenging passage connected to the cylinder body, wherein the cylinder body is provided with an air inlet and an air outlet; the scavenging passage comprises a first port and a second port in communication, wherein the first port is in communication with the air inlet;

[0006] a motion mechanism, movably disposed in the cylinder body; when the motion mechanism is in a first position, the exhaust port and the second port are blocked; when the motion mechanism is in a second position, the exhaust port and the first port are communicated;

[0007] a lubricating oil spraying device, used for spraying lubricating oil to the moving mechanism; and

[0008] An oil-gas separator is arranged in the scavenging passage and is used for separating the lubricating oil and gas passing through the first port.

[0009] Furthermore, the oil-gas separator includes a first oil filter and a second oil filter, and the first oil filter and the second oil filter are arranged in the extension direction of the scavenging passage.

[0010] Furthermore, the first oil filter comprises a filter body and a fixing frame fixed to the inner wall of the scavenging passage, the filter body is arranged on the fixing frame and blocks at least a part of the scavenging passage; the filter body is provided with a plurality of air holes for ventilation.

[0011] Furthermore, there are multiple filter bodies, which are arranged in the extension direction of the scavenging duct, and the materials of the multiple filter bodies are the same or different; and / or

[0012] The material of the filter body is felt or foam cotton.

[0013] Furthermore, the second oil filter includes a plurality of partition plates, which are arranged along the extension direction of the scavenging passage; and a gap is provided between the partition plates and the inner wall of the scavenging passage.

[0014] Furthermore, the inner wall of the scavenging duct includes a first side and a second side that are oppositely arranged; the partition plate includes a first partition plate and a second partition plate, the first partition plate is extended from the first side toward the second side; the second partition plate is extended from the second side toward the first side; the first partition plate and the second partition plate are alternately arranged along the extension direction of the scavenging duct.

[0015] Furthermore, the lubricating oil injection device includes an oil return pipe and an oil pump, one end of the oil return pipe is connected to the cylinder body, and the other end is connected to the oil pump; the oil pump is used to pump lubricating oil to the moving mechanism; the oil return pipe is used to return the lubricating oil in the cylinder body to the oil pump.

[0016] Further, one end of the oil return pipe is connected to the bottom of the cylinder body; and / or

[0017] The lubricating oil injection device also includes an oil tank and a nozzle. The oil tank is connected to the oil pump. The oil pump is connected to the nozzle from outside the cylinder body for pumping lubricating oil to the nozzle. The nozzle is penetrated through the cylinder body, and the oil spray port of the nozzle is arranged toward the motion mechanism.

[0018] Further, it comprises an injector for injecting fuel, the injector is arranged in the scavenging passage and located between the oil-gas separator and the second port, and the injection port of the injector is arranged toward the second port; and / or

[0019] The motion mechanism includes a piston and a crankshaft device, and the piston is slidably arranged in the cylinder body; when the motion mechanism is in a first position, the piston blocks the exhaust port and the second port; when the motion mechanism is in a second position, the exhaust port and the first port are connected; the crankshaft device is connected to the piston to drive the piston to move.

[0020] Furthermore, a pressure booster is included, one end of which is connected to the air inlet and the other end is connected to the air outlet, and the pressure booster is used to increase the air pressure at the air inlet.

[0021] The two-stroke engine provided by the present application comprises a compression cylinder, a motion mechanism, a lubricating oil injection device and an oil-gas separator. The compression cylinder comprises a cylinder body and a scavenging passage connected to the cylinder body. The cylinder body is provided with an air inlet and an exhaust port, and the scavenging passage comprises a first port and a second port which are connected, and the first port is connected to the air inlet. The oil-gas separator is arranged in the scavenging passage, and is used to separate the lubricating oil and gas passing through the first port. The oil-gas separator can separate the lubricating oil and the gas, so that the lubricating oil can be prevented from being burned and consumed, thereby reducing the consumption of the lubricating oil and saving resources.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 It is a structural schematic diagram of a two-stroke engine according to an exemplary embodiment of the present application when the motion mechanism is in a first position;

[0025] Figure 2 It is a schematic structural diagram of a two-stroke engine according to an exemplary embodiment of the present application when the motion mechanism is in the second position;

[0026] Figure 3 Shown is a top view of a two-stroke engine according to an exemplary embodiment of the present application;

[0027] Figure 4 Shown is a schematic diagram of an oil-gas separator of a two-stroke engine according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0028] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0029] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one. "Multiple" or "several" means two or more. Unless otherwise specified, words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect.

[0030] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0031] The present application provides a two-stroke engine. The two-stroke engine of the present application is described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0032] Figure 1 It is a structural schematic diagram of a two-stroke engine 10 according to an exemplary embodiment of the present application when the moving mechanism 12 is in a first position; Figure 2 It is a schematic structural diagram of a two-stroke engine 10 according to an exemplary embodiment of the present application when the moving mechanism 12 is in the second position; Figure 3 FIG. 1 is a top view of a two-stroke engine 10 according to an exemplary embodiment of the present application. Figures 1 to 3As shown, the present application provides a two-stroke engine 10, which can be applied to equipment such as aircraft, automobiles, motorcycles, etc., and can provide power for the equipment to operate. The two-stroke engine 10 includes a compression cylinder 11, a motion mechanism 12, a lubricating oil injection device 13 and an oil-gas separator 14. The compression cylinder 11 includes a cylinder body 15 and a scavenging passage 16 connected to the cylinder body 15. The scavenging passage 16 can be connected to the cylinder body 15. Among them, the number of scavenging passages 16 can be one or more, and the multiple scavenging passages 16 can be evenly arranged along the circumference of the cylinder body 15, or can be irregularly arranged along the circumference of the cylinder body 15, which is not limited by the present application. The cylinder body 15 is provided with an air inlet 17 and an exhaust port 18. It can be understood that the gas enters the cylinder body 15 through the air inlet 17, and the exhaust gas generated after the gas is burned is discharged from the cylinder body 15 through the exhaust port 18. In some embodiments, the two-stroke engine 10 includes an intake pipe 48 and an exhaust pipe 49, wherein the intake pipe 48 is connected to the intake port 17, and the exhaust pipe 49 is connected to the exhaust port 18. The gas enters the cylinder 15 through the intake pipe 48 and the intake port 17 in sequence; the exhaust gas generated after the gas is burned is discharged from the two-stroke engine 10 through the exhaust port 18 and the exhaust pipe 49 in sequence. In some embodiments, the two-stroke engine 10 may include a valve 21 disposed in the intake pipe 48, and the valve 21 may be a reed valve. When the valve 21 is opened, the gas may enter the cylinder 15 through the intake port 17. The scavenging passage 16 includes a first port 19 and a second port 20 that are connected. It is understood that the first port 19 and the second port 20 are connected to each other. The first port 19 is connected to the intake port 17. Among them, the gas can enter one side of the cylinder body 15 through the air inlet 17, enter the scavenging passage 16 through the first port 19, and then enter the other side of the cylinder body 15 through the second port 20 to burn and do work, and the exhaust gas generated after combustion is discharged from the cylinder body 15 from the exhaust port 18. In this embodiment, the number of scavenging passages 16 is multiple, and the scavenging passages 16 may include a post-scavenging passage 22, a first main scavenging passage 23, a first auxiliary scavenging passage 24, a second main scavenging passage 25, and a second auxiliary scavenging passage 26. Among them, the provision of multiple scavenging passages 16 can improve the working efficiency of the two-stroke engine 10. The above-mentioned multiple scavenging passages 16 can transport fresh gas from one side of the cylinder body 15 to the other side of the cylinder body 15, and while facilitating the combustion of gas and doing work, the exhaust gas generated after combustion can be accelerated. The rear scavenging passage 22 and the exhaust port 18 are arranged on opposite sides of the cylinder body 15 along the radial direction of the cylinder body 15, and the gas through the rear scavenging passage 22 can discharge the exhaust gas at the top of the cylinder body 15. Optionally, the first auxiliary scavenging passage 24 and the second auxiliary scavenging passage 26 can be arranged on adjacent sides of the rear scavenging passage 22 along the circumferential direction of the cylinder body 15.

[0033] The motion mechanism 12 is movably disposed in the cylinder body 15. Figure 1As shown, when the motion mechanism 12 is in the first position, the exhaust port 18 and the second port 20 are blocked. The gas can burn and do work in the other side space of the cylinder body 15. Figure 2 As shown, when the moving mechanism 12 is in the second position, the exhaust port 18 and the first port 19 are connected. Fresh gas can enter the scavenging passage 16 from one side of the cylinder body 15 through the first port 19, and enter the other side of the cylinder body 15 through the second port 20. In this process, the fresh gas can push the exhaust gas to be discharged from the cylinder body 15 through the exhaust port 18. The lubricating oil injection device 13 is used to spray lubricating oil to the moving mechanism 12, which can lubricate the moving mechanism 12 and facilitate the movement of the moving mechanism 12. The lubricating oil can be engine oil. The oil-gas separator 14 is arranged in the scavenging passage 16. At least one oil-gas separator 14 is arranged in each scavenging passage 16. For example, when the number of scavenging passages 16 is three, the number of oil-gas separators 14 is at least three. The oil-gas separator 14 is used to separate the lubricating oil and gas passing through the first port 19. In this embodiment, see Figure 1 As shown, when the motion mechanism 12 is in the first position, the exhaust port 18 and the second port 20 are blocked, and the gas can burn and do work in the other side space of the cylinder body 15. At this time, the lubricating oil injection device 13 can inject lubricating oil to the motion mechanism 12. Figure 2 As shown, when the motion mechanism 12 is in the second position, the exhaust port 18 is connected to the first port 19. At this time, fresh gas can carry a part of the lubricating oil from one side of the cylinder body 15 and enter the scavenging passage 16 through the first port 19. After the lubricating oil and gas are separated by the oil-gas separator 14 in the scavenging passage 16, the gas can enter the second port 20 through the oil-gas separator 14 and enter the other side of the cylinder body 15 for combustion and work; the lubricating oil will return to one side of the cylinder body 15. The oil-gas separator 14 can separate the lubricating oil and the gas, so as to prevent the lubricating oil from being carried by the gas from the air inlet 17 to the other side of the cylinder body 15 for combustion and consumption, thereby reducing the consumption of the lubricating oil and reducing the waste of resources. And when the lubricating oil is engine oil, such a setting can reduce the combustion consumption of the engine oil and reduce the pollution of the exhaust gas to the surrounding environment.

[0034] In some embodiments, the motion mechanism 12 includes a piston 27 and a crankshaft device 28, and the piston 27 is slidably disposed in the cylinder body 15. The piston 27 can separate the cylinder body 15 into a first part 29 and a second part 30, and the gas can enter the first part 29 through the air inlet 17, enter the scavenging passage 16 through the first port 19, and then enter the second part 30 through the second port 20 for combustion and work. The crankshaft device 28 is connected to the piston 27 and is used to drive the piston 27 to move. The lubricating oil injection device 13 can be used to inject lubricating oil to the crankshaft device 28. When the motion mechanism 12 is in the first position, the piston 27 blocks the exhaust port 18 and the second port 20. At this time, the gas can burn and work in the second part 30. At the same time, fresh gas enters the first part 29 from the air inlet 17, and enters the scavenging passage 16 through the first port 19. Since the gas burns violently in the space on the other side of the cylinder body 15, the piston 27 will move, so that the motion mechanism 12 switches from the first position to the second position. When the moving mechanism 12 is in the second position, the exhaust port 18 is connected to the first port 19. Fresh gas can enter the second portion 30 from the second port 20, and exhaust gas is discharged out of the cylinder body 15 through the exhaust port 18.

[0035] In some embodiments, the two-stroke engine 10 includes an injector 31 for injecting fuel. The injector 31 may be a low-pressure injector. The number of the injectors 31 may be one or more, wherein the multiple injectors 31 are evenly or irregularly arranged along the circumference of the cylinder 15, which is not limited in the present application. The injector 31 is arranged in the scavenging passage 16 and is located between the oil-gas separator 14 and the second port 20. In the present embodiment, the number of the scavenging passages 16 is multiple, and the injectors 31 are respectively arranged on the rear scavenging passage 22 and the two scavenging passages 16 adjacent to the exhaust port 18. Among them, when the motion mechanism 12 is in the first position, the injector 31 can spray fuel to the motion mechanism 12. It is understandable that fuel can be sprayed to the piston 27 of the motion mechanism 12, so as to ensure good lubrication between the piston 27 and the inner wall of the cylinder 15. When the motion mechanism 12 is in the second position, the fuel injector 31 can spray fuel into the cylinder 15 through the second port 20, and the fuel is used for subsequent combustion and work after being sprayed into the cylinder 15. This arrangement ensures that the oil-gas separator 14 does not block the fuel from entering the cylinder 15 from the second port 20, thereby ensuring the working efficiency of the two-stroke engine 10, and provides lubrication for the piston 27, thereby facilitating the movement of the motion mechanism 12. The fuel injection port of the fuel injector 31 is arranged toward the second port 20. Optionally, the fuel injection port of the fuel injector 31 is arranged upward, and the angle between the axis of the fuel injector 31 and the horizontal direction can be in the range of 30° to 70°, so that the combustion effect is better.

[0036] In some embodiments, the lubricating oil injection device 13 includes an oil return pipe 32 and an oil pump 33. The oil return pipe 32 may be a hose that can be adapted to a limited space. One end of the oil return pipe 32 is connected to the cylinder 15, and the other end is connected to the oil pump 33. The oil-gas separator 14 can separate the lubricating oil and gas passing through the first port 19, wherein the gas can enter the second port 20 through the oil-gas separator 14, and the lubricating oil will drip back into the first part 29. In this embodiment, one end of the oil return pipe 32 is connected to the bottom of the cylinder 15. Due to gravity, the lubricating oil will accumulate at the bottom of the cylinder 15. It can be understood that the lubricating oil will accumulate at the bottom of the first part 29. The connection of the oil return pipe 32 to the bottom of the cylinder 15 has a simple structure, which is convenient for the oil return pipe 32 to quickly return oil. The oil pump 33 is used to pump lubricating oil to the motion mechanism 12. The oil return pipe 32 is used to return the lubricating oil in the cylinder 15 to the oil pump 33. A gas is provided for returning the lubricating oil in the cylinder 15 to the oil pump 33, so that the lubricating oil returned to the first part 29 can be returned to the oil pump 33 through the oil return pipe 32 and reused by the oil pump 33. In this way, the lubricating oil can be repeatedly used, thereby further reducing the consumption rate of the lubricating oil.

[0037] In some embodiments, the lubricating oil injection device 13 further includes an oil tank 34 and a nozzle 35. The oil tank 34 stores lubricating oil. The oil tank 34 is connected to an oil pump 33, and the oil pump 33 is connected to the nozzle 35 from the outside of the cylinder body 15, for pumping lubricating oil to the nozzle 35. The oil pump 33 has two oil inlet branches, one of which is connected to the oil tank 34, and the other is connected to the bottom of the cylinder body 15 through the oil return pipe 32. The nozzle 35 is penetrated through the cylinder body 15, and the oil injection port of the nozzle 35 is arranged toward the motion mechanism 12. It can be understood that the oil injection port of the nozzle 35 can be arranged toward the crankshaft device 28. The lubricating oil sprayed from the nozzle 35 can come from the oil tank 34 and the oil return pipe 32. The oil pump 33 is used to provide the lubricating oil in the oil tank 34 to the nozzle 35. The oil tank 34 can provide a sufficient amount of lubricating oil to the nozzle 35. In this way, while the lubricating oil is recycled by using the return oil pipe 32, the timely supply of lubricating oil can be guaranteed, thereby ensuring the lubrication effect and improving the working efficiency of the two-stroke engine 10.

[0038] In some embodiments, the two-stroke engine 10 includes a supercharger 36. The supercharger 36 may be a turbocharger. One end of the supercharger 36 is connected to the air inlet 17, and the other end is connected to the exhaust port 18. The supercharger 36 is used to increase the intake pressure of the air inlet 17. Such a configuration can utilize the airflow of the exhaust port 18 to increase the intake pressure of the air inlet 17, thereby accelerating the flow rate of the gas through the oil-gas separator 14, ensuring that a sufficient amount of gas can pass through the oil-gas separator 14 and enter the other side of the cylinder 15 to ensure the efficiency of combustion. Optionally, when the supercharger 36 is a turbocharger, the supercharger 36 includes a turbine 37 and a pump wheel 38 connected to the turbine 37, and the airflow of the exhaust gas discharged from the exhaust port 18 can be used to drive the turbine 37 to rotate, so as to drive the pump wheel 38 to rotate, so that the pump wheel 38 can drive and pressurize the gas in the air inlet 17, thereby increasing the intake pressure of the air inlet 17.

[0039] Figure 4 FIG. 1 is a schematic diagram of an oil-gas separator 14 of a two-stroke engine 10 according to an exemplary embodiment of the present application. Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the oil-gas separator 14 includes a first oil filter 39 and a second oil filter 40. The first oil filter 39 and the second oil filter 40 can be used to separate lubricating oil from gas. The first oil filter 39 and the second oil filter 40 are arranged in the extension direction of the scavenging passage 16. Among them, the number of the first oil filter 39 can be one or more. The number of the second oil filter 40 can be one or more. It can be understood that the first oil filter 39 and the second oil filter 40 are arranged in the extension direction of the scavenging passage 16. It can refer to that the first oil filter 39 is arranged near the first port 19 relative to the second oil filter 40, or it can refer to that the second oil filter 40 is arranged near the first port 19 relative to the first oil filter 39. Among them, the first oil filter 39 and the second oil filter 40 can be arranged alternately in the extension direction of the scavenging passage 16. It can also be that the first oil filter 39 and the second oil filter 40 are arranged irregularly in the extension direction of the scavenging passage 16, and this application does not limit it. In this embodiment, the first oil filter 39 and the second oil filter 40 have different structures. In other embodiments, the first oil filter 39 and the second oil filter 40 may also have the same structure, which is not limited in this application. The first oil filter 39 and the second oil filter 40 can prevent the lubricating oil droplets mixed in the fresh air from entering the second part 30, which facilitates the separation of the lubricating oil and the gas, and improves the oil-gas separation effect of the oil separator 14.

[0040] In some embodiments, the first oil filter 39 includes a filter body 41 and a fixing frame 42 fixed to the inner wall of the scavenging passage 16, and the filter body 41 is arranged on the fixing frame 42. The filter body 41 can be fixed to the inner wall of the scavenging passage 16 by the fixing frame 42. Among them, the filter body 41 can be in a sheet shape and can be laid flat on the fixing frame 42. The filter body 41 can also be in a block shape, and the fixing frame 42 is penetrated in the filter body 41. Optionally, the material of the filter body 41 is felt or foam cotton. In this way, the oil-gas separation effect is better. In this embodiment, the material of the filter body 41 is felt, and such a setting can ensure at least 95% of the oil-gas separation rate. The filter body 41 blocks at least part of the scavenging passage 16. It can be understood that the filter body 41 can completely block the scavenging passage 16, or it can block part of the scavenging passage 16. Among them, the filter body 41 can be located in the middle of the scavenging passage 16, so that the separation effect of lubricating oil and gas is better. The filter body 41 is provided with a plurality of air holes for ventilation, so that the gas can enter the second port 20 through the filter body 41, and the lubricating oil will be blocked by the filter body 41 and will return to the first part 29. In some embodiments, there are multiple filter bodies 41, which are arranged in the extension direction of the scavenging duct 16, and the materials of the multiple filter bodies 41 are the same or different. For example, when there are multiple filter bodies 41, the materials of the multiple filter bodies 41 can be only felt, only foam cotton, or both felt and foam cotton. Such a setting improves the efficiency of oil-gas separation.

[0041] In some embodiments, the second oil filter 40 includes a partition plate 43, and the number of the partition plates 43 is multiple, and they are arranged along the extension direction of the scavenging passage 16. The multiple partition plates 43 can improve the efficiency of oil-gas separation. There is a gap between the partition plate 43 and the inner wall of the scavenging passage 16, and the gas can enter the second port 20 through the gap between the partition plate 43 and the inner wall of the scavenging passage 16, while the lubricating oil will be blocked by the partition plate 43 and return to the first part 29. Such a setting has a better separation effect between the lubricating oil and the gas, the speed at which the lubricating oil returns to the first part 29 is faster, and the recycling efficiency of the lubricating oil is higher.

[0042] In some embodiments, the inner wall of the scavenging passage 16 includes a first side 44 and a second side 45 that are arranged opposite to each other. It is understood that the first side 44 and the second side 45 are arranged opposite to each other along the first radial direction of the scavenging passage 16. The partition plate 43 includes a first partition plate 46 and a second partition plate 47, and the first partition plate 46 extends from the first side 44 to the direction of the second side 45. The second partition plate 47 extends from the second side 45 to the direction of the first side 44. The first partition plate 46 and the second partition plate 47 are arranged alternately along the extension direction of the scavenging passage 16. When the lubricating oil passes through the gap between the first partition plate 46 and the inner wall of the scavenging passage 16 in this way, it can be blocked by the second partition plate 47, and the effect of blocking the lubricating oil is better. In some other embodiments, the inner wall of the scavenging passage 16 includes a third side (not shown) and a fourth side (not shown) that are arranged opposite to each other. It is understood that the third side and the fourth side are arranged opposite to each other along the second radial direction of the scavenging passage 16. The first radial direction is perpendicular to the second radial direction. The first partition plate 46 is extended in the first radial direction, the second partition plate 47 is extended in the second radial direction, and the first partition plate 46 and the second partition plate 47 are irregularly arranged along the extension direction of the scavenging passage 16. In this way, the plurality of partition plates 43 are irregularly fixed to the inner wall of the scavenging passage 16, and the effect of separating the lubricating oil and the gas is better.

[0043] In this embodiment, see Figure 1 As shown, when the motion mechanism 12 is in the first position, the piston 27 blocks the exhaust port 18 and the second port 20. The gas can burn and do work in the space on the other side of the cylinder 15. At this time, the injector 31 can spray fuel to the motion mechanism 12, so that the piston 27 and the inner wall of the cylinder 15 are well lubricated. Since the gas burns violently in the space on the other side of the cylinder 15, the piston 27 will move, so that the motion mechanism 12 switches from the first position to the second position. In this process, the nozzle 35 can spray lubricating oil to the crankshaft device 28, so that the crankshaft device 28 drives the piston 27 to move.

[0044] See also Figure 2 As shown, when the motion mechanism 12 is in the second position, the exhaust port 18 is connected to the first port 19, and the fuel injector 31 can inject fuel for combustion and work into the cylinder 15 through the second port 20. Fresh gas can enter one side of the cylinder 15 through the intake port 17, and carry part of the lubricating oil from one side of the cylinder 15, and enter the scavenging passage 16 through the first port 19. After the lubricating oil and gas are separated by the oil-gas separator 14 in the scavenging passage 16, the fresh gas can enter the other side of the cylinder 15 through the second port 20. The lubricating oil will return to one side of the cylinder 15, and is connected to the oil pump 33 through the oil return pipe 32, and can be provided to the nozzle 35 again.

[0045] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0046] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A two-stroke engine, characterized in that: include: A compression cylinder, comprising a cylinder body and a scavenging passage connected to the cylinder body, wherein the cylinder body is provided with an air inlet and an air outlet; The scavenging passage comprises a first port and a second port in communication, wherein the first port is in communication with the air inlet; a motion mechanism, movably disposed in the cylinder body; when the motion mechanism is in a first position, the exhaust port and the second port are blocked; when the motion mechanism is in a second position, the exhaust port and the first port are communicated; the motion mechanism comprises a piston and a crankshaft device, the crankshaft device is connected to the piston, and is used to drive the piston to move; A lubricating oil spraying device, used for spraying lubricating oil to the motion mechanism; the lubricating oil spraying device also includes a nozzle; An oil-gas separator is arranged in the scavenging passage, and is used to separate the lubricating oil and gas passing through the first port; the oil-gas separator includes a first oil filter and a second oil filter, and the first oil filter and the second oil filter are arranged in the extension direction of the scavenging passage; the first oil filter includes a filter body, and the filter body is provided with a plurality of air holes for ventilation; the second oil filter includes a partition plate, and the number of the partition plates is plural, and the partition plates are arranged in the extension direction of the scavenging passage; there is a gap between the partition plate and the inner wall of the scavenging passage; An injector for injecting fuel, the injector is arranged in the scavenging passage and is located between the oil-gas separator and the second port, and the injection port of the injector is arranged toward the second port; when the moving mechanism is in the first position, the injector is used to spray fuel to the moving mechanism, and the nozzle is used to spray lubricating oil to the crankshaft device; when the moving mechanism is in the second position, gas entrains part of the lubricating oil into the scavenging passage through the first port, and the injector is used to spray fuel for combustion and work into the cylinder through the second port.

2. The two-stroke engine according to claim 1, characterized in that: The first oil filter comprises a fixing frame fixed to the inner wall of the scavenging passage, and the filter body is arranged on the fixing frame and blocks at least a part of the scavenging passage.

3. The two-stroke engine according to claim 2, characterized in that: There are multiple filter bodies, which are arranged in the extension direction of the scavenging passage, and the materials of the multiple filter bodies are the same or different; and / or The material of the filter body is felt or foam cotton.

4. The two-stroke engine according to claim 1, characterized in that: The inner wall of the scavenging duct includes a first side and a second side that are opposite to each other; the partition plate includes a first partition plate and a second partition plate, the first partition plate extends from the first side toward the second side; the second partition plate extends from the second side toward the first side; the first partition plate and the second partition plate are alternately arranged along the extension direction of the scavenging duct.

5. The two-stroke engine according to claim 1, characterized in that: The lubricating oil injection device includes an oil return pipe and an oil pump, one end of the oil return pipe is connected to the cylinder body, and the other end is connected to the oil pump; the oil pump is used to pump lubricating oil to the moving mechanism; the oil return pipe is used to return the lubricating oil in the cylinder body to the oil pump.

6. The two-stroke engine according to claim 5, characterized in that One end of the oil return pipe is connected to the bottom of the cylinder body; and / or The lubricating oil injection device also includes an oil tank, which is connected to the oil pump. The oil pump is connected to the nozzle from outside the cylinder body and is used to pump lubricating oil to the nozzle; the nozzle is penetrated by the cylinder body, and the oil injection port of the nozzle is arranged toward the motion mechanism.

7. The two-stroke engine according to claim 1, characterized in that The piston is slidably disposed in the cylinder; when the motion mechanism is in a first position, the piston blocks the exhaust port and the second port; when the motion mechanism is in a second position, the exhaust port is communicated with the first port.

8. The two-stroke engine according to claim 1, characterized in that: The two-stroke engine further comprises a supercharger, one end of which is connected to the air inlet and the other end of which is connected to the exhaust port, and the supercharger is used to increase the intake pressure of the air inlet.

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