Piston and engine

Abstract

The utility model relates to a piston and an engine, the peripheral surface of the piston is provided with a plurality of piston ring grooves for installing piston rings at intervals along the axial direction of the piston, the peripheral surface of the piston is also provided with an anti-impact structure, and the anti-impact structure is positioned between the top surface of the piston and the piston ring groove closest to the top surface of the piston. The anti-impact structure comprises an annular air groove and an annular partition plate, the annular air groove is formed in the peripheral face of the piston, the annular partition plate divides the annular air groove into a plurality of groove bodies sequentially formed in the axial direction of the piston, and the annular partition plate is provided with a plurality of hollowed-out structures at intervals in the circumferential direction so that every two adjacent groove bodies can communicate with each other. The anti-impact structure can reduce the energy of pressure impact waves, reduce the impact of the pressure impact waves on the piston ring, effectively protect the piston ring, prevent the piston ring from deforming under the action of the pressure impact waves, avoid the problems of air leakage increase, engine oil injection, even cylinder scoring and the like caused by the deformation of the piston ring of an engine, and improve the reliability of the engine.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine, especially a piston and engine. BACKGROUND

[0002] Engine super knock is the abnormal rise of cylinder pressure caused by large-area spontaneous combustion in the combustion chamber before normal ignition. The super knock is called "super" because the cylinder pressure when the super knock occurs is much higher than that of ordinary knock, and the instantaneous in-cylinder pressure even exceeds 400 bar, so a very obvious knocking sound can be heard when the super knock occurs.

[0003] The combustion chamber is surrounded by the piston, the cylinder and the cylinder head, a plurality of piston ring grooves are arranged on the outer circumferential surface of the piston, and a piston ring is embedded in each piston ring groove. The piston ring is a core component inside the engine, which, together with the cylinder and the piston, completes the sealing of the combustion gas. The piston rings on the piston are functionally divided into two types. One is a gas ring installed near the top surface of the piston, which is used to seal the high-temperature and high-pressure gas in the engine combustion chamber to prevent it from leaking into the crankcase. The gas ring usually has two or more numbers. The other is an oil ring installed near the piston pin, which is used to form a lubricating oil film between the piston ring and the cylinder wall to reduce the friction between the piston ring and the cylinder wall and to scrape off the excess lubricating oil on the cylinder wall to prevent the oil from entering the combustion chamber and burning. When the engine experiences super knock, that is, when there is high-frequency and ultra-high pressure fluctuation in the combustion chamber, the pressure is transmitted to the first piston gas ring through the gap between the piston and the cylinder wall, which will cause the piston gas ring to be deformed by the impact of the huge pressure wave, resulting in a large amount of engine blow-by, engine oil injection, and even major reliability problems such as cylinder pulling. SUMMARY

[0004] The first purpose of the utility model is to provide a piston to reduce the impact on the gas ring when super knock occurs, avoid the problems of increased blow-by, oil injection and even cylinder pulling caused by deformation of the engine piston ring, and improve the reliability of the engine.

[0005] The second purpose of the utility model is to provide an engine based on the above-mentioned piston.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A piston, the outer circumferential surface of the piston is spaced apart along the axial direction of the piston and is provided with a plurality of piston ring grooves for mounting piston rings, and the outer circumferential surface of the piston is further provided with an anti-impact structure located between the top surface of the piston and the piston ring groove closest to the top surface of the piston, the anti-impact structure comprising:

[0008] An annular air groove is arranged on the outer circumferential surface of the piston.

[0009] The annular partition plate separates the annular gas groove into a plurality of groove bodies arranged in sequence along the axial direction of the piston, and a plurality of hollow structures are arranged in the circumferential direction to communicate adjacent two groove bodies.

[0010] In an embodiment of the present application, at least two annular partition plates are arranged in the annular gas groove along the axial direction of the piston.

[0011] In an embodiment of the present application, the distance between the hollow structure on the annular partition plate farthest from the top surface of the piston and the axis of the piston is smaller than the distance between the hollow structure on the other annular partition plate and the axis of the piston.

[0012] In an embodiment of the present application, the distance between the hollow structure on the annular partition plate closer to the top surface of the piston among the adjacent two annular partition plates and the axis of the piston is greater than the distance between the hollow structure on the other annular partition plate and the axis of the piston.

[0013] In an embodiment of the present application, the outer diameter of the annular partition plate farthest from the top surface of the piston is greater than the outer diameter of the other annular partition plate.

[0014] In an embodiment of the present application, the annular gas groove has a first ring bank on the side close to the top surface of the piston along the axial direction of the piston, and a second ring bank on the side away from the top surface of the piston along the axial direction of the piston, and the outer diameter of the first ring bank is not greater than the outer diameter of the second ring bank.

[0015] In an embodiment of the present application, the outer diameter of the annular partition plate farthest from the top surface of the piston is the same as the outer diameter of the second ring bank, and the outer diameter of the annular partition plate closest to the top surface of the piston is the same as the outer diameter of the first ring bank.

[0016] In an embodiment of the present application, the size of the groove body farthest from the top surface of the piston along the axial direction of the piston is greater than the size of the other groove bodies along the axial direction of the piston.

[0017] In an embodiment of the present application, the distance between the hollow structure and the outer edge of the annular partition plate is greater than the distance between the hollow structure and the inner edge of the annular partition plate.

[0018] An engine, wherein the piston of the engine is the piston according to any one of the above.

[0019] It can be seen from the above technical scheme that the utility model discloses a piston, a plurality of piston ring grooves for installing piston rings are arranged on the outer circumferential surface of the piston along the axial direction of the piston, and an anti-impact structure is arranged on the outer circumferential surface of the piston, the anti-impact structure is located between the top surface of the piston and the piston ring groove closest to the top surface of the piston, and the anti-impact structure comprises an annular air groove and an annular partition plate, wherein the annular air groove is arranged on the outer circumferential surface of the piston, the annular partition plate divides the annular air groove into a plurality of groove bodies arranged in sequence along the axial direction of the piston, and a plurality of hollow structures are arranged in the annular partition plate in a circumferential direction to communicate the adjacent two groove bodies.

[0020] During the operation of the engine, when super knock occurs, at least part of the pressure shock wave P generated by the knock is shunted into the adjacent two groove bodies of the anti-impact structure through the annular partition plate along the gap between the piston and the cylinder wall, so that the pressure shock wave P is decomposed into pulse waves P1 and P2, the pulse waves P1 and P2 are superimposed at the hollow structure connecting the two groove bodies, the pulse wave energy is offset, the energy of the pressure shock wave is reduced, the impact of the pressure shock wave on the piston ring is reduced, the piston ring is effectively protected, the deformation of the piston ring under the action of the pressure shock wave is prevented, the problems of increased blow-by gas, engine oil injection and even cylinder pulling caused by the deformation of the piston ring are avoided, and the reliability of the engine is improved.

[0021] The application also discloses an engine adopting the piston, and since the engine adopts the piston, the technical effects of the engine are the same as those of the piston, and will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description can only be some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 The structure schematic view of the piston provided in an embodiment of the utility model is shown in the figure.

[0024] Figure 2 The structure schematic view of the piston provided in an embodiment of the utility model is shown in the figure. Figure 1 The partial enlarged sectional view of A in the figure.

[0025] Figure 3 The structure schematic view of the piston provided in another embodiment of the utility model is shown in the figure.

[0026] Figure 4 The working principle schematic view of the anti-impact structure of the piston provided in the embodiment of the utility model is shown in the figure.

[0027] Fig. 1 is a structural schematic view of an engine provided with a piston according to the present application,

[0028] 100 is a piston; 110 is a top surface; 120 is a piston ring groove; 130 is an anti-impact structure; 131 is an annular air groove; 131a is a first groove body; 131b is a second groove body; 131c is a third groove body; 132 is an annular partition plate; 132a is a first partition plate; 132b is a second partition plate; 133 is a hollow structure; 133a is a first hollow part; 133b is a second hollow part; 134 is a reinforcing rib; 140 is a first ring bank; 150 is a second ring bank;

[0029] 200 is a cylinder wall. DETAILED DESCRIPTION

[0030] One of the cores of the present application is to provide a piston, the structural design of which can reduce the impact on the gas ring when super knock occurs, avoid the problems of increased air leakage, engine oil injection and even cylinder pulling caused by deformation of the engine-driven piston ring, and improve the reliability of the engine.

[0031] Another core of the present application is to provide an engine using the above-mentioned piston.

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Please refer to Figure 1 and Figure 2 , Figure 1 Fig. 1 is a structural schematic view of a piston provided by an embodiment of the present application, Figure 2 Fig. 2 is a structural schematic view of an engine provided with the piston shown in Fig. 1, Figure 1 Fig. 3 is a partial enlarged sectional view of position A in Fig. 2.

[0034] In the embodiments of the present application, a piston 100 is disclosed, the outer circumferential surface of which is spaced apart along the axial direction of the piston 100 and is provided with a plurality of piston ring grooves 120 for mounting piston rings, as shown in Figure 1 In an embodiment of the present application, the piston ring grooves 120 are provided with three, two of which close to the top surface 110 of the piston 100 are used for mounting piston gas rings, and the one farthest from the top surface 110 of the piston 100 is used for mounting a piston oil ring. The outer circumferential surface of the piston 100 is further provided with an anti-impact structure 130, which is located between the top surface 110 of the piston 100 and the piston ring groove 120 closest to the top surface 110 of the piston 100. The anti-impact structure 130 is used to reduce the energy of the pressure shock wave generated by super knock before it reaches the piston ring.

[0035] like Figure 2 As shown, the impact-resistant structure 130 includes an annular air groove 131 and an annular partition 132. The annular air groove 131 is disposed on the outer peripheral surface of the piston 100, and its arrangement is similar to that of the piston annular groove 120. That is, the annular air groove 131 includes an upper groove wall, a lower groove wall, and a vertical groove wall. The upper groove wall, the lower groove wall, and the vertical groove wall are all about the axis of the piston 100. The upper groove wall is closer to the top surface 110 of the piston 100 than the lower groove wall. The upper groove wall and the lower groove wall are arranged opposite to each other, that is, the upper groove wall and the lower groove wall are spaced apart along the axial direction of the piston 100. The upper groove wall and the lower groove wall generally extend along the radial direction of the piston 100, and the vertical groove wall extends along the axial direction of the piston 100.

[0036] The upper and lower groove walls can be parallel to each other or at an angle to each other. The upper and lower groove walls are respectively connected to the upper and lower ends of the vertical groove wall. In order to facilitate the entry of the pressure shock wave into the annular gas groove 131, the upper groove wall can be gradually inclined from the inner edge connected to the vertical groove wall towards the top surface 110 of the piston 100. Even if the upper groove wall forms an annular cone surface, a chamfer can be provided at the edge of the upper groove wall to achieve a similar function. Correspondingly, the lower groove wall can also be gradually inclined from the inner edge connected to the vertical groove wall towards the top surface 110 of the piston 100, so that the pressure shock wave flowing out of the annular gas groove 131 flows out in an inclined upward direction and cancels out the pressure shock wave along the gap between the piston 100 and the cylinder wall 200 downward. In a specific embodiment of this application, the upper and lower groove walls are parallel and perpendicular to the axis of the piston 100.

[0037] The annular partition 132 divides the annular gas groove 131 into multiple grooves arranged sequentially along the axial direction of the piston 100. The annular partition 132 is provided with multiple hollow structures 133 at intervals along the circumference to connect two adjacent grooves. The hollow structure 133 is composed of multiple hollow parts, which are holes, grooves, or a combination of holes and grooves. The hollow parts penetrate the annular partition 132 along the thickness direction, and the penetration direction of the hollow parts can be parallel to the axis of the piston 100 or at a certain angle to the axis of the piston 100.

[0038] The hollow structure 133 on each annular partition 132 can be set as one or more hollow parts around the vertical side groove wall. The number of hollow parts on different annular partitions 132 can be the same or different. When the hollow part on the annular partition 132 is set with multiple rings, the hollow parts on adjacent rings are staggered in the radial direction of the piston 100.

[0039] The cutout can be a round hole, an elliptical hole, a polygonal hole, or an arc-shaped groove.

[0040] The annular baffle 132 includes an inner edge near the axis of the piston 100 in the radial direction and an outer edge away from the axis of the piston 100. The inner edge of the annular baffle 132 is connected to the vertical side wall of the annular groove 131. The outer edge of the annular baffle 132 is close to the opening of the annular groove 131, that is, the side of the annular groove 131 away from the vertical side wall. The shape of the outer edge matches the shape of the circumferential wall of the piston 100. The annular baffle 132 is parallel or substantially parallel to the upper and lower side walls of the annular groove 131. The two side plates of the annular baffle 132 facing the upper and lower side walls can be flat, convex or concave. Of course, when the two side plates of the annular baffle 132 are convex or concave, their curvature is small and closer to a flat surface.

[0041] During engine operation, when a super knock occurs, such as Figure 4 As shown, at least part of the pressure shock wave P generated by the detonation is diverted by the annular baffle 132 along the gap between the piston 100 and the cylinder wall 200 into two adjacent grooves of the anti-impact structure 130, thereby decomposing the pressure shock wave P into pulse wave P1 and pulse wave P2. After the pulse wave P1 and pulse wave P2 collide with the annular baffle 132 and the groove wall of the annular air groove 131 in the groove, they converge and superimpose at the hollow structure 133 connecting the two grooves, thereby canceling the pulse wave energy. Finally, after impacting the groove wall in the groove with the largest distance from the top surface 110 of the piston 100, they flow out of the annular air groove 131, further weakening the energy of the pulse wave.

[0042] Compared with the prior art, the piston 100 provided in this embodiment of the present invention can effectively reduce the energy of the pressure shock wave by setting the anti-impact structure 130, reduce the impact of the pressure shock wave on the piston ring, effectively protect the piston ring, prevent the piston ring from deforming under the action of the pressure shock wave, avoid problems such as increased air leakage, oil spraying or even cylinder scoring caused by piston ring deformation in the engine, and improve the reliability of the engine.

[0043] Preferably, to improve the impact resistance of the impact-resistant structure 130, at least two annular baffles 132 are provided in the annular air groove 131. Multiple annular baffles 132 are spaced apart along the axial direction of the piston 100 within the annular air groove 131. The radial and circumferential dimensions of each annular baffle 132 along the piston 100 can be the same or different. The dimensions of the multiple grooves divided by the multiple annular baffles 132 along the axial direction of the piston 100 can also be the same or different. If the number of annular baffles 132 is n, then the number of grooves divided is n+1, where n is a positive integer greater than or equal to 2. Figure 2 and Figure 4As shown, in an embodiment of the present application, two annular partitions 132 are arranged in the annular air groove 131, which divides the annular air groove 131 into three groove bodies. In this way, when the engine operates to generate super knock, the pulses in the two groove bodies relatively close to the top surface 110 of the piston 100 can be superimposed on each other to weaken, and then enter the groove body farthest from the top surface 110 of the piston 100 to be superimposed again to weaken and flow out, thereby sufficiently reducing the impact of the pressure shock wave.

[0044] In order to ensure that the pulse waves in the upper groove body can be superimposed on each other and then enter the lower groove body, as a preferred embodiment, the distance between the hollow structure 133 on the annular partition 132 farthest from the top surface 110 of the piston 100 and the axis of the piston 100 is less than the distance between the hollow structure 133 on the other annular partition 132 and the axis of the piston 100, such as Figure 2 As shown, in a specific embodiment of the present application, two annular partitions 132 are arranged in the annular air groove 131, which are a first partition 132a relatively close to the top surface 110 of the piston 100 and a second partition 132b relatively far from the top surface 110 of the piston 100. The first partition 132a and the second partition 132b divide the annular air groove 131 into a first groove body 131a, a second groove body 131b, and a third groove body 131c arranged in order from near to far relative to the top surface 110 of the piston 100. The hollow structure 133 on the first partition 132a is a first hollow part 133a, and the hollow structure 133 on the second partition 132b is a second hollow part 133b.

[0045] As can be seen from the figure, the distance between the first hollow part 133a and the vertical groove wall is greater than the distance between the second hollow part 133b and the vertical groove wall, that is, the distance between the first hollow part 133a and the axis of the piston 100 is greater than the distance between the second hollow part 133b and the axis of the piston 100. That is, the first hollow part 133a and the second hollow part 133b are not arranged directly opposite each other, but are staggered in the radial direction of the piston 100. The projections of the first hollow part 133a and the second hollow part 133b on the plane perpendicular to the axis of the piston 100 only partially overlap or are completely staggered. In this way, the upper and lower hollow structures 133 can be prevented from being directly opposite each other, and the pulse waves in the first groove body 131a can be prevented from directly passing through the first hollow part 133a and the second hollow part 133b to enter the third groove body 131c without being superimposed with the pulse waves in the second groove body 131b. Furthermore, by staggering the first hollow part 133a and the second hollow part 133b, the pulse waves in the first groove body 131a can be forced to turn after hitting the second partition 132b, further weakening the pulse waves.

[0046] Further optimization of the above technical solutions, the distance between the hollow structure 133 on one of the two adjacent annular partitions 132 close to the top surface 110 of the piston 100 and the axis of the piston 100 is greater than the distance between the hollow structure 133 on the other annular partition 132 and the axis of the piston 100, that is, the hollow structures 133 on each annular partition 132 are staggered with each other, so as to ensure that the pulse wave must hit the annular partition 132 during moving along the axis of the piston 100 into the lower layer groove, and further weaken the energy of the pulse wave.

[0047] In order to ensure that the pressure shock wave in the gap between the piston 100 and the cylinder wall 200 can smoothly enter the upper layer groove close to the top surface 110 of the piston 100, in an embodiment of the present application, the outer diameter of the annular partition 132 farthest from the top surface 110 of the piston 100 is greater than the outer diameter of the other annular partitions 132. In this way, the annular partition 132 farthest from the top surface 110 of the piston 100 can block a part of the pressure shock wave, so that the pressure shock wave is more easily entered into the upper layer groove, superimposed and weakened, and then entered into the lowermost layer groove, that is, the groove farthest from the top surface 110 of the piston 100.

[0048] As shown in Figure 2 , in a specific embodiment, the outer diameter of the first partition 132a is smaller than the outer diameter of the second partition 132b. Of course, if there are more than two annular partitions 132 in other embodiments, the outer diameter of each annular partition 132 can increase from near to far from the top surface 110 of the piston 100, or the outer diameter of the annular partitions 132 except the annular partition 132 farthest from the top surface 110 of the piston 100 can be the same.

[0049] In order to facilitate the pressure shock wave between the piston 100 and the cylinder wall 200 to smoothly enter the annular groove, in an embodiment of the present application, the side of the annular groove 131 close to the top surface 110 of the piston 100 along the axial direction of the piston 100 is a first ring bank 140, and the side of the annular groove 131 away from the top surface 110 of the piston 100 along the axial direction of the piston 100 is a second ring bank 150. The outer diameter of the first ring bank 140 is not greater than the outer diameter of the second ring bank 150, that is, the outer diameter of the first ring bank 140 is smaller than or equal to the outer diameter of the second ring bank 150, as shown in Figure 2 , in a specific embodiment, the outer diameter of the first ring bank 140 is slightly smaller than the outer diameter of the second ring bank 150.

[0050] As preferred, in order to facilitate the pressure shock wave to enter the annular air groove 131, in an embodiment of the present application, the circumferential wall surface of the first ring bank 140 is a tapered surface gradually inclined toward the axis of the piston 100 from the end close to the top surface 110 of the piston 100, or the circumferential wall surface of the first ring bank 140 includes two parts, one part is a cylindrical wall surface, and the other part is a conical wall surface connected to the end of the cylindrical wall surface away from the top surface 110 of the piston 100, and the conical wall surface is gradually inclined toward the axis of the piston 100 from the end connected to the cylindrical wall surface, thereby forming a guide structure for facilitating the pressure shock wave to enter the annular air groove 131.

[0051] Further optimization of the above technical solution, the outer diameter of the annular partition plate 132 farthest from the top surface 110 of the piston 100 is the same as the outer diameter of the second ring bank 150, and the outer diameter of the annular partition plate 132 closest to the top surface 110 of the piston 100 is the same as the outer diameter of the first ring bank 140, as shown in Figure 2 The outer diameter of the first partition plate 132a is the same as the outer diameter of the first ring bank 140, and the outer diameter of the second partition plate 132b is the same as the outer diameter of the second ring bank 150, and in other embodiments, when more than two annular partition plates 132 are arranged in the annular air groove 131, the outer diameter of the other annular partition plates 132 between the two annular partition plates 132 at both ends (the two annular partition plates 132 farthest and closest to the top surface 110 of the piston 100) can be the same as or slightly larger than the outer diameter of the annular partition plate 132 closest to the top surface 110 of the piston 100.

[0052] Further optimization of the above technical solution, in an embodiment of the present application, the size of the groove body farthest from the top surface 110 of the piston 100 along the axial direction of the piston 100 is larger than the size of the other groove bodies along the axial direction of the piston 100, by increasing the size of the groove body farthest from the top surface 110 of the piston 100 along the axial direction of the piston 100, the pulse wave can be buffered in the groove body in a space-increased manner, further reducing the energy of the pulse wave.

[0053] As preferred, in an embodiment of the present application, as shown in Figure 2 The distance between the hollow structure 133 and the outer edge of the annular partition plate 132 is greater than the distance between the hollow structure 133 and the inner edge of the annular partition plate 132.

[0054] In order to increase the strength of the annular partition plate 132 and avoid the annular partition plate 132 from being deformed by the impact of the pulse wave, in an embodiment of the present application, as shown in Figure 3As shown, at least one of the two side surfaces of the annular partition plate 132 and the vertical side groove wall of the annular air groove 131 are provided with a plurality of reinforcing ribs 134, each of which is uniformly distributed along the vertical side groove wall in the circumferential direction, so as to improve the connection strength between the annular partition plate 132 and the vertical side groove wall and prevent the annular partition plate 132 from deforming.

[0055] The application further provides an engine, the piston 100 of the engine is the piston 100 as described in the above embodiment, and since the engine adopts the piston 100 in the above embodiment, the technical effects of the engine refer to the above embodiment, and the engine includes but is not limited to a gasoline engine, a diesel engine, a methanol engine and a natural gas engine.

[0056] As shown in the present application and claims, unless the context clearly indicates otherwise, "one", "a", "an" and / or "the" do not refer to the singular, but can also include the plural. Generally, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the phrase "comprising a" does not exclude the presence of another identical element in the process, method, product or device comprising the element.

[0057] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0058] It should be noted that each embodiment in the present specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between each embodiment can be referred to each other.

[0059] The principle and implementation mode of the present application are described by using specific examples, and the above embodiment description is only used to help understand the core idea of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A piston, a plurality of piston ring grooves (120) for mounting a piston ring are provided at an outer peripheral surface of the piston (100) at intervals in an axial direction of the piston (100), characterized in that, The outer circumferential surface of the piston (100) is further provided with an anti-impact structure (130) located between the top surface (110) of the piston (100) and the piston ring groove (120) closest to the top surface (110) of the piston (100), the anti-impact structure (130) comprises: An annular air groove (131) is arranged on the outer circumferential surface of the piston (100); An annular partition plate (132) divides the annular air groove (131) into a plurality of groove bodies arranged in sequence along the axial direction of the piston (100), and a plurality of hollow structures (133) are arranged in the annular partition plate (132) in a circumferential direction to communicate adjacent two groove bodies.

2. The piston of claim 1 wherein, At least two annular partition plates (132) are arranged in the annular air groove (131) in the axial direction of the piston (100).

3. The piston of claim 2 wherein, The distance between the hollow structure (133) on the annular partition plate (132) farthest from the top surface (110) of the piston (100) and the axis of the piston (100) is smaller than the distance between the hollow structure (133) on the other annular partition plate (132) and the axis of the piston (100).

4. The piston of claim 3 wherein, The distance between the hollow structure (133) on the annular partition plate (132) closer to the top surface (110) of the piston (100) of the adjacent two annular partition plates (132) and the axis of the piston (100) is greater than the distance between the hollow structure (133) on the other annular partition plate (132) and the axis of the piston (100).

5. The piston of any one of claims 1-4, wherein, The outer diameter of the annular partition plate (132) farthest from the top surface (110) of the piston (100) is greater than the outer diameter of the other annular partition plate (132).

6. The piston of claim 5 wherein, The annular air groove (131) is provided with a first annular bank (140) on one side of the top surface (110) of the piston (100) in the axial direction of the piston (100), and a second annular bank (150) on the other side of the top surface (110) of the piston (100) in the axial direction of the piston (100), and the outer diameter of the first annular bank (140) is not greater than the outer diameter of the second annular bank (150).

7. The piston of claim 6 wherein, The outer diameter of the annular partition plate (132) farthest from the top surface (110) of the piston (100) is the same as the outer diameter of the second annular bank (150), and the outer diameter of the annular partition plate (132) closest to the top surface (110) of the piston (100) is the same as the outer diameter of the first annular bank (140).

8. The piston of any one of claims 1-4, wherein, The size of the groove body farthest from the top surface (110) of the piston (100) in the axial direction of the piston (100) is greater than the size of the other groove bodies in the axial direction of the piston (100).

9. The piston of any one of claims 1-4, wherein, The distance of the hollow structure (133) from the outer edge of the annular partition (132) is greater than the distance of the hollow structure (133) from the inner edge of the annular partition (132).

10. An engine characterized by, The piston of the engine is a piston (100) according to any one of claims 1 to 9.

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