Engine piston
By designing multi-layered annular grooves and oil reservoirs in the annular groove section of the engine piston, the oil storage and distribution are optimized, solving the problem of excessive oil consumption and achieving improved lubrication performance and efficient engine operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-03-31
AI Technical Summary
Existing engine piston designs neglect the importance of oil storage, leading to excessive oil consumption, poor lubrication, and negatively impacting engine performance and fuel economy.
Multiple annular grooves and oil ring lands are designed in the annular groove section of the engine piston. In particular, the third annular groove is wider and has an oil reservoir. It is connected by chamfering on the skirt to optimize the storage and distribution of engine oil and enhance the lubrication effect.
It significantly reduces oil consumption, improves lubrication performance, extends piston life, and enhances engine fuel economy and overall efficiency.
Smart Images
Figure CN224064440U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engine technology, and in particular to an engine piston. Background Technology
[0002] As the core power component of modern mechanical equipment, the optimization of engine performance has always been a key research focus in the industrial field. The piston, as one of the key components of the engine, primarily functions by reciprocating within the cylinder. The high-pressure gas generated by fuel combustion in the combustion chamber drives the piston to perform work, which is then converted into mechanical energy.
[0003] In traditional engine piston designs, a typical engine piston consists of a piston crown, ring grooves, and a piston skirt. The piston crown bears the enormous load generated by combustion, the ring grooves house piston rings for sealing and oil control, and the piston skirt guides the piston's movement within the cylinder. For example, multiple ring grooves are typically provided in the ring grooves for installing compression rings and oil rings. Compression rings prevent high-pressure gases from leaking from the combustion chamber into the crankcase, ensuring cylinder sealing. Oil rings scrape excess oil from the cylinder walls as the piston moves downward, preventing oil from entering the combustion chamber and causing excessive oil consumption and carbon buildup. They also distribute oil evenly across the cylinder walls as the piston moves upward, providing lubrication and reducing friction and wear between the piston and cylinder walls. However, existing engine pistons often neglect the importance of oil storage, leading to rapid oil consumption and poor lubrication.
[0004] Therefore, there is an urgent need for an improved engine piston design to enhance the efficiency of oil storage, distribution, and utilization, thereby improving engine lubrication performance and fuel economy. Utility Model Content
[0005] This invention provides an engine piston that can solve the problem of oil consumption in the prior art, significantly reduce oil consumption, improve oil economy, and extend piston service life.
[0006] An engine piston comprises a piston top, an annular groove, and a piston skirt. The outer circumference of the annular groove is provided with a first annular groove, a first oil ring land, a second annular groove, a second oil ring land, a third annular groove, and a third oil ring land from top to bottom. The width of the third annular groove is greater than that of the first and second annular grooves. The lower side of the third oil ring land is connected to the piston skirt by a chamfer on the skirt. An oil reservoir is provided on the second oil ring land.
[0007] Furthermore, a top notch is provided on one side of the piston top.
[0008] Furthermore, the height of the oil storage section is 0.45 mm, and the diameter of the oil storage section is 72.8 ± 0.1 mm.
[0009] Furthermore, the upper side of the oil storage section is provided with rounded corners.
[0010] Furthermore, the radius of the fillet is 0.3 mm.
[0011] Furthermore, the surface roughness of the oil storage section is 6.3 μm.
[0012] Furthermore, the diameters of the first oil ring shore, the second oil ring shore, and the third oil ring shore decrease sequentially, wherein the diameter of the second oil ring shore is 74.35±0.1mm.
[0013] Furthermore, the height of the first oil ring shore is three times that of the second and third oil ring shores.
[0014] Furthermore, the surface roughness of the first oil ring shore, the second oil ring shore, and the third oil ring shore is 6.3 μm.
[0015] Furthermore, the upper and lower sides of the first oil ring shore, the upper and lower sides of the second oil ring shore, and the upper side of the third oil ring shore are all chamfered.
[0016] The beneficial effects of this utility model are:
[0017] 1. This utility model provides a multi-layered lubrication channel for the piston by carefully designing a first, second, and third annular groove on the outer circumference of the annular groove portion, along with corresponding oil ring landers. In particular, the width of the third annular groove is greater than that of the first and second annular grooves, which can accommodate more lubricating oil, ensuring sufficient lubrication between the piston ring and the cylinder wall even when the engine is operating under high load, reducing friction and wear, and extending the engine's service life.
[0018] 2. In this utility model, the lower side is connected to the piston skirt by a chamfer on the skirt. This detail helps the lubricating oil flow more smoothly when the piston moves, enhances the sealing performance, and improves engine efficiency.
[0019] 3. This utility model provides an oil reservoir on the second oil ring land. During the piston's downward oil scraping process, the oil reservoir can release the stored engine oil, providing a continuous and stable lubrication supply to the piston ring. This effectively reduces the loss of engine oil during engine operation, thereby ensuring that the engine maintains good lubrication under different operating conditions, reducing wear between the piston ring and cylinder wall, and extending the service life of engine components. Attached Figure Description
[0020] Figure 1 A schematic diagram of an engine piston structure provided by this utility model.
[0021] Explanation of reference numerals in the attached figures:
[0022] 1. Piston top; 2. Annular groove; 3. Piston skirt; 11. Top notch; 21. First annular groove; 22. First oil ring land; 23. Second annular groove; 24. Second oil ring land; 25. Third annular groove; 26. Third oil ring land; 31. Chamfer on skirt; 241. Oil reservoir. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] like Figure 1 As shown in the figure, an engine piston provided by this utility model embodiment includes a piston top 1, an annular groove 2 and a piston skirt 3 in sequence. The annular groove 2 has a first annular groove 21, a first oil ring land 22, a second annular groove 23, a second oil ring land 24, a third annular groove 25 and a third oil ring land 26 arranged from top to bottom on the outer circumference.
[0025] Specifically, the piston top 1 bears the combustion load. During engine operation, the pressure generated by the high-temperature, high-pressure gas in the combustion chamber acts on the piston top 1, pushing the piston to move and converting the heat energy generated by combustion into mechanical energy. A notch 11 is provided on one side of the piston top 1 to avoid interference with the valve position. During the engine's working cycle, the valves open and close according to a certain pattern to control the intake and exhaust processes. The notch 11 prevents interference between the piston and the valves during movement, ensuring that all engine components can work together normally.
[0026] Specifically, the first ring groove 21 and the second ring groove 23 are used to install the gas rings that are not released in the piston ring diagram, to prevent high-pressure gas in the combustion chamber from leaking into the crankcase and to ensure the cylinder's sealing. The third ring groove 25 is used to install the oil rings that are not released in the piston ring diagram. The width of the third ring groove 25 is greater than that of the first ring groove 21 and the second ring groove 23. It is used to scrape off excess oil on the cylinder wall when the piston moves downward, to prevent oil from entering the combustion chamber and participating in combustion, which would cause problems such as excessive oil consumption and carbon buildup. When the piston moves upward, it can also distribute the oil evenly on the cylinder wall, which can play a lubricating role, reduce friction between the piston and the cylinder wall, and reduce wear.
[0027] The first oil ring land 22, the second oil ring land 24, and the third oil ring land 26 not only provide support for the oil ring but also work together with it to scrape and distribute oil. The height of the first oil ring land 22 is three times that of the second and third oil ring lands 24 and 26. This design helps to store more oil during the piston's upward oil distribution process, reducing oil consumption. Furthermore, the diameters of the first, second, and third oil ring lands 22 and 26 decrease sequentially, with the second oil ring land 24 having a diameter of 74.35 ± 0.1 mm. The larger diameter of the first oil ring land 22 increases the contact area with the oil, promoting more even oil distribution. Additionally, this structure allows for the storage of some oil during piston movement by utilizing the changing gap between the oil ring lands and the cylinder wall, reducing oil consumption and improving oil utilization. The surface roughness of the first oil ring land 22, the second oil ring land 24, and the third oil ring land 26 is 6.3 μm, which can improve the contact between the oil ring and the oil ring land, ensuring sealing performance, reducing frictional resistance, and extending the service life of the components. The upper and lower sides of the first oil ring land 22, the upper and lower sides of the second oil ring land 24, and the upper side of the third oil ring land 26 are all chamfered to avoid sharp edges from scratching the oil ring and cylinder wall, and also to facilitate the flow and distribution of oil.
[0028] Specifically, an oil reservoir 241 is provided on the second oil ring land 24. The oil reservoir 241 has a height of 0.45 mm and a diameter of 72.8 ± 0.1 mm, which allows the oil reservoir 241 to store a certain amount of engine oil and release engine oil during the piston's downward oil scraping process to maintain the lubrication of the cylinder wall. The surface roughness of the oil reservoir is 6.3 μm, which helps to distribute the engine oil evenly and reduce engine oil leakage. The upper side of the oil reservoir 241 is provided with a rounded corner with a radius of 0.3 mm, which reduces the accumulation of engine oil at the edge of the oil reservoir 241 and improves the utilization efficiency of engine oil.
[0029] The piston skirt 3 guides the piston's movement within the cylinder, ensuring its reciprocating motion along the axial direction and bearing lateral pressure to support stable piston operation. Specifically, the lower edge of the third oil ring land 26 is connected to the piston skirt 3 via a chamfer 31 on the skirt. The chamfer 31 makes the transition between the oil ring land and the piston skirt 3 smoother, facilitating oil flow between them, improving oil utilization efficiency, and ensuring the engine's lubrication and sealing performance.
[0030] The engine piston in this invention comprises a piston top, an annular groove, and a piston skirt, all working in concert. The piston top bears the combustion load. The first and second annular grooves of the annular groove are used to install the compression ring, preventing high-pressure gas leakage; the third annular groove is used to install the oil ring, which scrapes oil downwards and distributes oil upwards. The oil ring land provides support for the oil ring, and in conjunction with the oil scraping and distribution, its diameter variation and height design help to store oil and reduce consumption. The oil reservoir of the second oil ring land increases the oil storage space, thereby reducing oil consumption, while the chamfer on the skirt facilitates oil flow between the oil ring land and the piston skirt. All parts work together to ensure efficient and stable engine operation, effectively improving engine power output, reducing oil consumption, and extending the overall service life of the engine.
[0031] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made in accordance with the claims of this utility model should still fall within the patent coverage of this utility model.
Claims
1. An engine piston, characterized in that The piston top (1), the ring groove part (2) and the piston skirt (3) are sequentially arranged, the outer periphery of the ring groove part (2) is sequentially provided with a first ring groove (21), a first oil ring bank (22), a second ring groove (23), a second oil ring bank (24), a third ring groove (25) and a third oil ring bank (26) from top to bottom, the width of the third ring groove (25) is greater than that of the first ring groove (21) and the second ring groove (23), the lower side of the third oil ring bank (26) is connected with the piston skirt (3) through a skirt chamfer (31), and the second oil ring bank (24) is provided with an oil storage part (241).
2. An engine piston as claimed in claim 1, characterized in that The piston top (1) is provided with a top notch (4) on one side.
3. An engine piston as claimed in claim 1, characterized in that The height of the oil storage part (241) is 0.45mm, and the diameter of the oil storage part (241) is 72.8±0.1mm.
4. An engine piston as claimed in claim 3, characterised in that The upper side of the oil storage part (241) is provided with a round corner.
5. An engine piston as claimed in claim 4, characterised in that The radius of the round corner is 0.3mm.
6. An engine piston as claimed in claim 1 or 5, characterised in that The surface roughness of the oil storage part (241) is 6.3μm.
7. An engine piston as claimed in claim 1, characterized in that The diameters of the first oil ring bank (22), the second oil ring bank (24) and the third oil ring bank (26) are sequentially reduced, and the diameter of the second oil ring bank (24) is 74.35±0.1mm.
8. An engine piston as claimed in claim 1, characterized in that The height of the first oil ring bank (22) is three times that of the second oil ring bank (24) and the third oil ring bank (26).
9. An engine piston as claimed in claim 1 or 7, characterised in that The surface roughness of the first oil ring bank (22), the second oil ring bank (24) and the third oil ring bank (26) is 6.3μm.
10. An engine piston as claimed in claim 1, characterized in that The upper side and the lower side of the first oil ring bank (22), the upper side and the lower side of the second oil ring bank (24) and the upper side of the third oil ring bank (26) are all provided with chamfers.