Circulating lubrication system of two-stroke engine
By designing a closed lubricant oil circulation system in a two-stroke engine, the problem of lubricant oil participating in combustion is solved, and better lubricating effect and environmentally friendly performance are achieved.
Patent Information
- Application Number
- CN202510832712.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-20
- Publication Date
- 2025-08-12
AI Technical Summary
In existing two-stroke engines, lubricating oil is easily mixed into fuel and involved in combustion, resulting in an increase in carbon deposits, polluting the environment and poor durability, and the improvement effect of the existing technology is limited.
A two-stroke engine circulation lubrication system is designed. By setting oil rings and peripheral oil passages on the upper and lower sides of the piston member, a closed space is formed. The lubricating oil circulates in the closed space and does not enter the combustion chamber or the scavenging chamber. A sealing device is used to prevent lubricating oil leakage.
The complete separation of lubricating oil and mixture is achieved, reducing carbon deposits are reduced, the lubricating effect and equipment durability are improved, and the lubricating oil consumption and exhaust smoke are reduced.
Smart Images
Figure CN120466050A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a two-stroke engine, in particular to a circulating lubrication system for a two-stroke engine. Background Art
[0002] A two-stroke engine completes a working cycle by moving the piston up and down twice (two strokes). The crankcase acts as a scavenging chamber, responsible for intake and pre-compression of air. Air is taken in and exhausted through the scavenging holes on the inner wall of the cylinder. The lubricating oil mixture is lubricated or precisely lubricated and inevitably enters the combustion chamber for combustion.
[0003] Existing problems: Lubricating oil is mixed into the fuel, causing the lubricating oil to participate in combustion, increasing carbon deposits, polluting the environment, poor durability, and insufficient lubrication. Most of the existing technologies are to reduce the amount of lubricating oil used, precise lubrication supply, and use oil-gas separators, which do not improve the problems of two-stroke engines much. The valve-operated two-stroke engine uses the same smooth cylinder inner wall as the four-stroke engine. The four-stroke engine uses splash lubrication for the cylinder wall, which cannot ensure that the lubricating oil is evenly splashed on the cylinder wall. The valve-operated two-stroke engine uses mixed lubrication, the lubricating oil participates in combustion, and the lubrication effect is poor.
[0004] Therefore, the present invention provides a two-stroke engine circulating lubrication system based on a smooth cylinder wall to solve the shortcomings of the prior art. Summary of the Invention
[0005] In view of the deficiencies in the prior art, the present invention provides a two-stroke engine circulating lubrication system, which solves the problems mentioned in the above background technology.
[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a two-stroke engine circulating lubrication system, including a crankshaft mechanism, a cylinder, a piston member, an oil channel and a sealing device, characterized in that oil rings are respectively provided on the upper and lower sides of the cylindrical body of the piston member, a circumferential oil channel is opened between the two oil rings, the outer side of the piston member slides on the inner wall of the cylinder, the two oil rings are fitted with the inner wall of the cylinder to form a closed space, the inner wall of the cylinder is provided with an oil inlet hole and an oil outlet hole and is movably connected to the piston circumferential oil channel, the crankshaft mechanism includes a connecting rod and a piston pin, oil channels are opened inside the crankshaft, connecting rod and piston pin, sealing devices are provided on both sides of both ends of the connecting rod and form a closed oil channel with the crankshaft, connecting rod and the oil channel inside the oil channel, and the lubricating oil circulates in the closed oil channel and the closed space formed by the piston oil ring and the cylinder wall.
[0007] When the two oil rings on the upper and lower sides of the piston move up and down on the cylinder wall, they will scrape off the lubricating oil on the cylinder wall. The lubricating oil remains in the closed space and will not enter the combustion chamber or the scavenging chamber. Sealing devices are provided on both sides of the connecting rod to prevent the lubricating oil from entering the scavenging chamber. The lubricating oil circulates in the closed space.
[0008] Preferably, an oil inlet hole and an oil drain hole are provided on the inner wall of the cylinder, an oil inlet hole and an oil drain hole are provided at both ends of the crankshaft, an oil passage is provided inside the crankshaft and is communicated with the oil inlet hole and the oil drain hole of the crankshaft rod, the oil inlet hole of the cylinder wall and the oil inlet hole of the crankshaft rod are communicated with the oil pump through an oil passage, the oil drain hole of the cylinder wall and the oil drain hole of the crankshaft rod are communicated with the oil storage chamber through an oil passage, an oil hole is provided on the outer side of the crankshaft intermediate shaft and is movably communicated with the inner side of the large hole of the connecting rod, an oil passage is provided in the piston pin, an oil hole is provided in the middle of the outer side of the piston pin and is movably communicated with the inner side of the small hole of the connecting rod, an external leakage oil passage is provided around the piston cylinder and is connected to both sides of the oil passage in the piston pin, and both sides of the oil passage in the piston pin are movably communicated with the oil inlet hole and the oil drain hole in the cylinder wall.
[0009] Preferably, an oil ring is provided on the upper side of the piston cylinder, and an oil ring is provided on the lower side of the piston cylinder. The outer side of the piston slides on the inner wall of the cylinder. The upper and lower oil rings of the piston cylinder fit with the inner wall of the cylinder to form a closed space. Sealing devices 1 are provided on both sides of the crankshaft end of the connecting rod and are movably connected to the crankshaft intermediate shaft. Sealing devices 2 are provided on the piston pin side of the connecting rod and are movably connected to the outer side of the piston pin. The sealing devices form a closed oil channel.
[0010] Preferably, the cylinder wall is provided with an oil inlet hole and an oil drain hole, including the oil inlet hole and the oil drain hole being laterally positioned on both sides of the cylinder wall and the piston pin hole, and the oil inlet hole and the oil drain hole being longitudinally positioned within the movable range of the upper and lower oil rings on the piston cylinder.
[0011] Preferably, an oil inlet passage and an oil drain passage are provided in the connecting rod, an oil inlet hole and an oil drain hole are provided in the crankshaft intermediate shaft and are communicated with the crankshaft oil inlet hole and the oil drain hole respectively, an oil inlet hole and an oil drain hole are provided on the outside of the piston pin and are communicated with the oil passage of the piston outer ring, one side of the oil inlet passage in the connecting rod is movably communicated with the crankshaft intermediate shaft oil inlet hole and the piston pin oil inlet hole, and the oil drain passage in the connecting rod is movably communicated with the crankshaft intermediate shaft oil drain hole and the piston pin oil drain hole.
[0012] Preferably, there are two paths for circulating lubrication. One is that the oil pump is connected to the oil channel in the crankshaft and the oil channel in the piston respectively. The second is that the oil pump is connected to the oil channel in the crankshaft through the oil inlet channel in the connecting rod into the piston oil channel, and the piston oil channel is connected to the oil channel in the crankshaft through the oil outlet channel in the connecting rod.
[0013] The present invention provides a circulating lubrication system for a two-stroke engine. It has the following beneficial effects: The present invention completely separates the lubricating oil from the mixed gas through a closed circulating lubrication system, and the lubricating oil no longer participates in combustion. The lubricating oil circulating lubrication saves the cost of the lubricating oil, and the exhaust does not emit smoke or produce carbon deposits, which is more environmentally friendly.
[0014] Closed circulation lubrication system Due to the sealed lubrication, the oil film always wraps around the moving parts, which has better lubrication effect, better sealing of piston rings and improved durability. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a diagram of the circulating lubrication seal and oil channel structure of the present invention; Figure 2 Schematic diagram of the oil circulation lubrication seal and oil passage structure in the connecting rod of the present invention; Figure 3 This is a schematic diagram of the oil circulation in the connecting rod of the present invention; Figure 4 Schematic diagram of the piston oil channel sealing structure of the present invention; Figure 5 This is a diagram of the circulating lubrication dual-channel oil passage of the present invention; Among them: 1. Oil storage chamber; 2. Oil pump; 3. Oil channel; 4. Crankshaft; 5. Piston; 6. Cylinder; 7. Connecting rod; 8. Oil ring; 9. Sealing device 1; 10. Piston outer ring oil channel; 11. Sealing device 2; 12. Piston pin oil channel; 13. Piston pin oil hole; 14. Piston pin; 15. Crankshaft rod oil drain hole 1; 16. Crankshaft rod oil inlet hole 1; 17. Cylinder wall oil drain hole 2; 18. Cylinder wall oil inlet hole 2; 19. Crankshaft intermediate shaft oil hole; 20. Connecting rod oil drain channel; 21. Connecting rod oil inlet channel; 23. Crankshaft intermediate shaft oil inlet hole 3; 24. Crankshaft intermediate shaft oil drain hole 3; 25. Piston pin oil drain hole 3; 26. Piston pin oil inlet hole 3. DETAILED DESCRIPTION
[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0017] See also Figure 1-Figure 5An embodiment of the present invention provides a circulating lubrication system for a two-stroke engine. The circulating lubrication system for a two-stroke engine includes: an oil storage chamber 1, an oil pump 2, a crank mechanism 4, a cylinder 6, a piston member 5, an oil passage 3, a sealing device 1 9, a sealing device 2 11, and an oil ring 8. The system mainly provides sealed lubrication for the movable parts of the crank mechanism 4, the piston member 5, and the cylinder wall 6. A sealing device 1 9 is installed at the junction of the crank mechanism 4 and the connecting rod 7. An oil inlet hole 16 and an oil outlet hole 15 are respectively provided on both sides of the crankshaft rod of the crank mechanism 4. The sealing device 9 prevents the engine oil from entering the crankcase. The oil passage 3 inside the crank mechanism 4 allows the lubricating oil to circulate.
[0018] like Figure 4 As shown, a sealing device 11 is installed at the connection between one end of the connecting rod 7 and the piston pin 14, an oil channel 12 is opened in the piston pin 14 to connect to the oil channel 10 outside the circumference of the piston cylinder 5, two air rings and an oil ring 8 are provided at the upper end of the piston cylinder 5, and an oil ring 8 is provided at the lower end of the piston cylinder 5. An external leakage oil channel 10 is opened around the outer wall of the piston cylinder 5 and communicates with the oil channel inside the piston pin 14. The oil channel 10 around the outer wall of the piston cylinder 5 is between the upper and lower oil rings 8 of the piston member 5, and the outer side of the piston member 5 slides inside the cylinder wall 6. The upper and lower oil rings 8 of the piston cylinder 5 fit with the inner wall 6 of the cylinder to form a closed space.
[0019] Furthermore, the oil passage 10 on the outer wall of the piston 7 is connected to the cylinder wall 6. The lubricating oil forms an oil film in the space between the piston 5 and the cylinder wall 6. The two oil rings 8 scrape off the lubricating oil when sliding in the cylinder inner wall 6. Too much lubricating oil will generate resistance. The size of the oil passage 10 on the outer wall of the piston is controlled to control the oil supply to the cylinder wall 6.
[0020] Furthermore, oil inlet holes 18 and oil drain holes 17 are formed on opposite sides of the cylinder wall 6. These holes are located between the two oil rings 8 on the piston 5, i.e., within the overlapping region of the piston 5's vertical travel within the cylinder wall. The oil inlet holes 18 and oil drain holes 17 are positioned laterally within the movable range of the cylinder wall 6 and the piston pin hole 12, and longitudinally within the movable range of the upper and lower oil rings 8 on the piston cylinder. Therefore, the length of the piston 5 is greater than the length of its travel.
[0021] Furthermore, an oil storage chamber 1 is installed on one side of the crankcase, and an oil pump 2 is installed in the oil storage chamber 1. The oil storage chamber 1 is communicated with the oil drain hole 15 of the crankshaft rod and the oil drain hole 17 of the cylinder wall. The oil channel of the oil pump 2 is connected to the oil inlet hole 16 of the crankshaft rod and the oil inlet hole 18 on the cylinder wall.
[0022] like Figure 5As shown, specifically, lubricating oil is pressurized by the oil pump 2 through the oil reservoir 1. There are two routes for the oil passage 3. The first is a dual-channel oil passage type, where the oil passage 3 connects to the crankshaft rod oil inlet hole 16 and the cylinder wall oil inlet hole 2 18. The crankshaft rod oil inlet hole 16 connects to the crankshaft internal oil passage, which then connects to the crankshaft intermediate shaft and connecting rod, and then to the crankshaft rod oil drain hole 15, which then connects to the oil reservoir 1, completing the cycle. The cylinder wall oil inlet hole 2 18 connects to the piston pin internal oil passage 12 and the piston component external leakage oil passage 10, connecting to the piston pin internal oil passage 12, connecting to the piston pin intermediate hole and connecting rod, connecting to the other side of the piston pin 12, merging with the piston component external oil passage, and finally to the cylinder wall oil drain hole 2 17, which then connects to the oil reservoir 1, completing the cycle.
[0023] The second type Figure 2 、 Figure 3 As shown, an oil inlet passage 21 and an oil drain passage 20 are respectively provided in the connecting rod 7, an oil inlet hole 3 23 and an oil drain hole 3 24 are provided in the crankshaft intermediate shaft and are communicated with the crankshaft oil inlet hole 16 and the oil drain hole 15 respectively, an oil inlet hole 3 26 and an oil drain hole 3 25 are provided in the piston pin and are communicated with the piston outer ring oil passage 10 through the piston pin inner oil passage 12, the connecting rod inner oil inlet passage 21 is movably communicated with the crankshaft intermediate shaft oil inlet hole 3 23 and the piston pin oil inlet hole 3 26, and the connecting rod inner oil drain passage 20 is movably communicated with the crankshaft intermediate shaft oil drain hole 3 24 and the piston pin oil drain hole 3 25.
[0024] Further oil passages lead to the crankshaft oil inlet hole 16, to the crankshaft intermediate shaft oil inlet hole 3 23, to the connecting rod inner oil inlet passage 21, to the piston pin oil inlet hole 3 26, to the piston outer oil passage 10, to the piston pin oil drain hole 3 25, to the connecting rod oil drain passage 20, to the crankshaft intermediate shaft oil drain hole 3 24, to the crankshaft rod oil drain hole 15, and to the oil storage chamber 1. In this way, the cylinder wall does not need the oil inlet hole 2 18 and the oil drain hole 2 17, and the length of the piston member 5 is not limited.
[0025] Further lubricating oil circulation path; oil pump 2-crankshaft rod oil inlet channel 16-crankshaft intermediate shaft oil inlet hole 3 23-connecting rod inner oil inlet channel 21-piston pin oil inlet hole 3 26-piston outer oil channel 10-piston pin oil drain hole 3 25-connecting rod oil drain channel 20-crankshaft intermediate shaft oil drain hole 3 24-crankshaft rod oil drain hole 15-oil reservoir 1; The present invention provides two lubricating oil paths. The sealing of the cylinder wall and the piston provided by the present invention, and other lubricating oil paths designed in conjunction with the oil passages and the oil inlet and outlet holes are all within the scope of protection.
[0026] The technical solution proposed by the present invention is based on a smooth cylinder wall and is not limited to being used in two-stroke engines and four-stroke engines.
[0027] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.
Claims
1. A two-stroke engine circulating lubrication system, comprising a crankshaft mechanism (4), a cylinder (6), a piston member (5), an oil passage (3), and a sealing device 1 (9), a sealing device 2 (11), characterized in that: Oil rings (8) are provided on the upper and lower sides of the piston cylinder, and a circumferential oil passage (10) is provided between the two oil rings (8). The outer side of the piston (5) slides on the inner wall (6) of the cylinder. The two oil rings (8) fit the inner wall (6) of the cylinder to form a closed space. The inner wall (6) of the cylinder is provided with two oil inlet holes (18) and two oil outlet holes (17), which are movably connected to the piston circumferential oil passage (10). The crankshaft mechanism (4) includes a connecting rod (7) and a piston pin (14). Oil passages are provided inside the crankshaft (4), the connecting rod (7) and the piston pin (14). Sealing devices (9) are provided on both sides of both ends of the connecting rod (7). The sealing device (11) forms a closed oil passage with the oil passages in the crankshaft (4), the connecting rod (7) and the piston pin (14). Lubricating oil circulates in the closed oil passage and the closed space formed by the two oil rings (8) and the cylinder wall (6).
2. A two-stroke engine circulating lubrication system according to claim 1, characterized in that: The crankshaft rods at both ends of the crankshaft (4) are respectively provided with an oil inlet hole (16) and an oil drain hole (15), which are communicated with the internal oil passage (3) of the crankshaft. The circumferential oil passage (10) of the piston member (5) is connected to both sides (12) of the oil passage in the piston pin and is communicated with the inner wall of the cylinder. The both sides (12) of the oil passage in the piston pin are respectively movably communicated with the second oil inlet hole (18) and the second oil drain hole (17) of the cylinder wall.
3. A two-stroke engine circulating lubrication system according to claim 2, characterized in that: It also includes an oil storage chamber (1) and an oil pump (2), wherein the crankshaft rod oil inlet hole 1 (16) and the cylinder wall oil inlet hole 2 (18) are communicated with the oil pump (2) through an oil passage (3), and the crankshaft rod oil discharge hole 1 (15) and the cylinder wall oil discharge hole 2 (17) are communicated with the oil storage chamber (1) through an oil passage (3).
4. A two-stroke engine circulating lubrication system according to claim 1, characterized in that: Sealing devices (9) are provided on both sides of the crankshaft end of the connecting rod (7) and are movably connected to the outer side of the crankshaft intermediate shaft. Sealing devices (11) are provided on both sides of the piston pin end of the connecting rod (7) and are movably connected to the outer side of the piston pin (14).
5. A two-stroke engine circulating lubrication system according to claim 2, characterized in that: The second oil inlet hole (18) and the second oil drain hole (17) on the inner wall of the cylinder (6) are horizontally located on both sides of the piston pin hole, and the second oil inlet hole (18) and the second oil drain hole (17) on the cylinder wall are longitudinally located within the movable range of the upper and lower oil rings (8) on the piston cylinder (5) within the cylinder wall (6).
6. A two-stroke engine circulating lubrication system according to claim 1, characterized in that: An oil inlet passage (21) and an oil drain passage (20) are provided inside the connecting rod (7); an oil inlet hole 3 (23) and an oil drain hole 3 (24) are provided on the intermediate shaft of the crankshaft (4), and the oil inlet hole 1 (16) and the oil drain hole 1 (15) are communicated with the crankshaft (4) respectively; an oil inlet hole 3 (26) and an oil drain hole 3 (25) are provided on the outside of the piston pin (14), and the oil inlet hole 3 (26) and the oil drain hole 3 (25) are communicated with the outer ring oil passage (10) through the internal oil passage (12) of the piston pin (7).
7. A two-stroke engine circulating lubrication system according to claim 6, characterized in that: The oil inlet passage (21) inside the connecting rod is communicated with the crankshaft intermediate shaft oil inlet hole three (23) and the piston pin oil inlet hole three (26), and the oil discharge passage (20) inside the connecting rod (7) is communicated with the crankshaft (4) intermediate shaft oil discharge hole three (24) and the piston pin oil discharge hole three (25).