Piston ring, piston ring set and engine

Abstract

The utility model provides a piston ring, a piston ring group and an engine, the piston ring comprises a main body ring, the main body ring is sleeved in a piston ring groove of a piston, and a gas circulation gap is arranged between the main body ring and a cylinder sleeve sleeved outside the piston; and the elastic ring is arranged on the main body ring in a deformable mode and extends into the gas circulation gap, so that the gas circulation gap is opened or closed through deformation of the elastic ring, and the problem that when an engine in the prior art is in an air inlet stage, engine oil reversely flows into a combustion chamber is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to internal combustion engine technical field, specifically, a piston ring, piston ring group and engine. BACKGROUND

[0002] In the prior art, there is a certain gap between the piston ring and the piston ring groove of the engine. This gap is set to avoid the piston ring from being heated by high-temperature gas, causing thermal expansion, and making the piston ring stuck on the cylinder wall or unable to retract normally, thereby increasing the wear and tear of the engine and oil consumption, and even causing damage to the cylinder wall and the piston.

[0003] However, when the engine is in the intake stage, the pressure in the combustion chamber decreases due to the intake of air. At this time, the gas pressure in the combustion chamber is lower than the gas pressure in the crankcase, forming a pressure difference. In this case, the oil will flow into the combustion chamber through the small gap between the piston ring and the piston ring groove under the push of the pressure difference between the combustion chamber and the crankcase. This process is called "burning oil". Burning oil not only directly leads to a sharp increase in oil consumption, increases the cost of the engine, and destroys the purity of the combustion process, increases harmful substances in emissions, challenges environmental standards, and reduces combustion efficiency, which has a negative impact on the performance and reliability of the engine. SUMMARY

[0004] The main purpose of the utility model is to provide a piston ring, a piston ring group and an engine to solve the problem of reverse flow of oil into the combustion chamber when the engine is in the intake stage in the prior art.

[0005] To achieve the above purpose, according to one aspect of the utility model, a piston ring is provided, which comprises: a main ring, the main ring is sleeved in the piston ring groove of the piston, and a gas flow gap is provided between the main ring and the cylinder sleeve sleeved outside the piston; an elastic ring, the elastic ring is deformably arranged on the main ring and extends into the gas flow gap, so as to open or close the gas flow gap by deformation of the elastic ring.

[0006] Further, an installation gap is provided between the main ring and the piston ring groove, and part of the elastic ring is arranged in the installation gap to cooperate with the main ring to realize the sealing between the piston and the cylinder sleeve.

[0007] Further, the elastic ring comprises a fixed ring segment and a deformed ring segment connected in sequence; wherein the fixed ring segment is arranged in the installation gap, and the deformed ring segment extends into the gas flow gap.

[0008] Further, the main body ring comprises a first ring wall surface, a first connecting surface, a second ring wall surface and a second connecting surface connected in sequence, wherein the first ring wall surface is in contact with the inner wall surface of the piston ring groove, at least part of the second ring wall surface is in contact with the deformed ring segment, the first connecting surface is in contact with the fixed ring segment, and the second connecting surface is in contact with the bottom surface of the piston ring groove.

[0009] Further, a first transition round corner is arranged between the second ring wall surface and the first connecting surface; and / or the cross section of the fixed ring segment is a rectangular section, and the fixed ring segment comprises a third ring wall surface, a third connecting surface and a fourth connecting surface connected in sequence, wherein the third ring wall surface is in contact with the inner wall surface of the piston ring groove, the third connecting surface is in contact with the top surface of the piston ring groove, and the fourth connecting surface is in contact with the first connecting surface; and / or the cross section of the deformed ring segment is a hook-like curved surface, and the hook-like curved surface further comprises an outer hook surface and an inner hook surface connected in sequence, a first side of the outer hook surface is connected with the fixed ring segment, a side of the outer hook surface away from the center line of the elastic ring is used for being in contact with the inner wall surface of the cylinder liner, the inner hook surface is located on a side of the outer hook surface close to the center line of the elastic ring and is in contact with the second ring wall surface, a second side of the outer hook surface is connected with a first side of the inner hook surface, and a second side of the inner hook surface is spaced apart from the outer hook surface and the fixed ring segment; wherein the outer hook surface is a first curved surface protruding in a direction away from the center line of the elastic ring, and the inner hook surface is a second curved surface recessing in a direction close to the center line of the elastic ring.

[0010] Further, the radius of the first transition round corner is R1, and the value range of R1 is greater than or equal to 0.2 mm and less than or equal to 3 mm; and / or a second transition round corner is arranged between the inner side of the connection between the fixed ring segment and the deformed ring segment, the radius of the second transition round corner is R2, and the value range of R2 is greater than or equal to 0.2 mm and less than or equal to 3 mm; and / or a third transition round corner is arranged between the outer side of the connection between the outer hook surface and the inner hook surface, the radius of the third transition round corner is R3, and the value range of R3 is greater than or equal to 0.2 mm and less than or equal to 5 mm.

[0011] Further, the contact point of the inner hook surface and the second ring wall surface is a J point, a predetermined straight line parallel to the center line of the elastic ring is drawn through the J point, the included angle between the predetermined straight line and the tangent of the inner wall surface of the outer hook surface is a, and the value range of a is greater than or equal to 2 degrees and less than or equal to 45 degrees.

[0012] Further, the size of the inner hook surface in the direction perpendicular to the center line of the elastic ring is L, and the value range of L is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0013] According to the second aspect of the utility model, a piston ring set is further provided, comprising a piston ring, and the piston ring is the piston ring described above.

[0014] According to a third aspect of the utility model, an engine is also provided, including piston ring group, piston ring group is above-mentioned piston ring group.

[0015] The utility model discloses a technical scheme, the utility model discloses a main body ring and elastic ring are set up, through the synergies of elastic ring and main body ring, can effectively adjust the size of gas flow interval, under the positive pressure condition, the pressure in combustion chamber is higher than the pressure of crankcase, and the airflow flows from combustion chamber to crankcase, at this moment, elastic ring is in free state, and after being subjected to the downward pressure, elastic ring will deform, and open gas flow interval, at this moment, gas flow interval is big, and the airflow is allowed to pass through, when the engine is in the admission stage, and the piston is down, and the gas pressure in combustion chamber falls rapidly, at this moment, if the gas pressure of crankcase is higher than the gas pressure in combustion chamber, this will form a pressure gradient, and the oil is made to flow to the direction of combustion chamber through the piston ring groove, and the elastic ring in the utility model can deform to close gas flow interval when being subjected to the upward pressure, and tightly adhere to the inner wall surface of cylinder sleeve, effectively reduce gas flow interval, effectively prevent the high-pressure gas in crankcase and oil from entering combustion chamber, improve the combustion efficiency and the overall performance of engine, and the problem that the oil flows reversely into combustion chamber when the engine is in the admission stage in the prior art is solved efficiently. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of this application form a part hereof, serve to provide further understanding of the application, and together with the description of the preferred embodiments explain the application. Such an exemplary embodiment of the application is provided in the accompanying drawings and its description is as follows:

[0017] Figure 1 Part of the structure schematic diagram of the piston ring embodiment according to the utility model is shown, and

[0018] Figure 2 Part of the structure schematic diagram of the piston ring embodiment according to the utility model is shown, and Figure 1 The structure schematic diagram of the elastic ring of the piston ring shown is shown.

[0019] Figure 3 The structure schematic diagram of the main body ring of the piston ring shown is shown. Figure 1 The structure schematic diagram of the main body ring of the piston ring shown is shown.

[0020] Figure 4 The structure schematic diagram of the main body ring of the piston ring shown is shown. Figure 1 The local enlarged view in B of the structure schematic diagram of the main body ring of the piston ring shown is shown.

[0021] Figure 5 The structure schematic diagram of the main body ring of the piston ring shown is shown.

[0022] Figure 6 The local enlarged view in B of the structure schematic diagram of the main body ring of the piston ring shown is shown. Figure 5 The local enlarged view in B of the structure schematic diagram of the main body ring of the piston ring shown is shown.

[0023] The above figures include the following reference numerals:

[0024] 10. Main body ring; 20. Elastic ring; 30. Piston; 40. Piston ring groove; 50. Cylinder liner; 60. Gas flow clearance; 70. Installation clearance;

[0025] 210. Fixed ring segment; 220. Deformable ring segment;

[0026] 110. First ring wall surface; 120. First connecting surface; 130. Second ring wall surface; 140. Second connecting surface; 150. First transition fillet; 160. Second transition fillet; 170. Third transition fillet;

[0027] 211. Third ring wall; 212. Third connecting surface; 213. Fourth connecting surface;

[0028] 221. External hook surface; 222. Internal hook surface. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] like Figures 1 to 6 As shown, this utility model provides a piston ring, including: a main ring 10, which is sleeved in the piston ring groove 40 of the piston 30, and a gas flow gap 60 is provided between the main ring 10 and the cylinder liner 50 sleeved outside the piston 30; and an elastic ring 20, which is deformably disposed on the main ring 10 and extends into the gas flow gap 60, so that the gas flow gap 60 can be opened or closed by the deformation of the elastic ring 20.

[0031] It can be seen that the utility model discloses a main body ring 10 and elastic ring 20 are arranged, through the cooperation of elastic ring 20 and main body ring 10, the size of gas flow gap 60 can be effectively adjusted, under the positive pressure condition, the pressure in the combustion chamber is higher than the pressure of the crankcase, the gas flows from the combustion chamber to the crankcase, at this moment, elastic ring 20 is in the free state, after being subjected to the downward pressure, elastic ring 20 will be deformed, and the gas flow gap 60 is opened, at this moment, the gas flow gap 60 is enlarged, and the gas flow is allowed to pass through, when the engine is in the air intake stage, the piston goes down, and the gas pressure in the combustion chamber rapidly drops, if the gas pressure of the crankcase is higher than the gas pressure in the combustion chamber, a pressure gradient will be formed, and the oil is caused to flow to the combustion chamber through the piston ring groove 40, the elastic ring 20 in the utility model can be deformed to close the gas flow gap 60 when being subjected to the upward pressure, and is tightly attached to the inner wall surface of the cylinder sleeve 50, the gas flow gap 60 is effectively reduced, the high-pressure gas in the crankcase and the oil are effectively prevented from entering the combustion chamber, the combustion efficiency and the overall performance of the engine are improved, and the problem that the oil flows reversely into the combustion chamber when the engine is in the air intake stage in the prior art is solved efficiently.

[0032] As shown in Figure 5 and Figure 6 , the main body ring 10 and the piston ring groove 40 are provided with an installation gap 70, and part of the elastic ring 20 is arranged in the installation gap 70 to cooperate with the main body ring 10 to realize the sealing between the piston 30 and the cylinder sleeve 50.

[0033] The design of the installation gap 70 between the main body ring 10 and the piston ring groove 40 can allow the elastic ring 20 to deform freely in the up-down movement of the piston 30, and ensure that the piston ring can provide stable sealing effect when the gas pressure of the crankcase is higher than the gas pressure in the combustion chamber under different working conditions, so that gas leakage or oil intrusion into the combustion chamber is prevented.

[0034] As shown in Figure 2 , the elastic ring 20 comprises a fixed ring segment 210 and a deformed ring segment 220 connected in sequence, wherein the fixed ring segment 210 is arranged in the installation gap 70, and the deformed ring segment 220 extends into the gas flow gap 60.

[0035] Specifically, the fixed ring segment 210 is a planar ring segment, and the deformed ring segment 220 is a curved ring segment with elasticity.

[0036] Furthermore, the deformable characteristics of the deformable ring segment 220 of the elastic ring 20 within the gas flow gap 60 can be dynamically adjusted according to changes in the combustion chamber pressure. When the engine is in the intake phase, the piston moves downward, and the gas pressure in the combustion chamber drops rapidly. If the gas pressure in the crankcase is higher than the gas pressure in the combustion chamber, a pressure gradient is formed, causing the oil to flow through the piston ring grooves towards the combustion chamber. When subjected to upward pressure, the deformable ring segment 220 can deform, fitting more tightly against the inner wall of the cylinder liner 50, effectively preventing gas and oil leakage. This significantly enhances the sealing performance of the combustion chamber, avoids pressure loss in the combustion chamber, and improves engine efficiency.

[0037] Furthermore, when the pressure inside the combustion chamber is higher than the pressure in the crankcase, the airflow flows from the combustion chamber to the crankcase. When the deformable ring 220 is subjected to downward pressure, it can deform, thereby increasing the gap between the deformable ring 220 and the cylinder liner 50, allowing some gas and oil to flow when needed.

[0038] like Figure 3 As shown, the main ring 10 includes a first ring wall 110, a first connecting surface 120, a second ring wall 130, and a second connecting surface 140 connected in sequence. The first ring wall 110 contacts the inner wall of the piston ring groove 40, ensuring the stable positioning of the piston ring within the piston ring groove 40. At least a portion of the second ring wall 130 contacts the deformable ring segment 220, ensuring accurate fit between the elastic ring 20 and the main ring 10 on the cylinder liner 50 and enhancing the sealing effect. The first connecting surface 120 contacts the fixed ring segment 210, ensuring the stability of the elastic ring 20 during the up-and-down movement of the piston 30. The second connecting surface 140 contacts the bottom surface of the piston ring groove 40, ensuring the stability of the main ring 10 and extending the service life of the piston ring.

[0039] Specifically, a first transition fillet 150 is provided between the second ring wall 130 and the first connecting surface 120 to cooperate with the connection between the fixed ring segment 210 and the deformable ring segment 220.

[0040] like Figure 2 As shown, the fixed ring segment 210 has a rectangular cross-section. The fixed ring segment 210 includes a third ring wall surface 211, a third connecting surface 212, and a fourth connecting surface 213 connected in sequence. The third ring wall surface 211 contacts the inner wall surface of the piston ring groove 40, the third connecting surface 212 contacts the top surface of the piston ring groove 40, and the fourth connecting surface 213 contacts the first connecting surface 120. The structural design of the third ring wall surface 211, the third connecting surface 212, and the fourth connecting surface 213 in this utility model ensures a tighter contact between the fixed ring segment 210 and the main ring 10 and the piston ring groove 40, ensuring that the piston ring maintains good sealing performance in the piston ring groove 40 under high temperature conditions.

[0041] likeFigure 2 As shown, the cross section of the deformed ring segment 220 is a hook-like curved surface, and the hook-like curved surface is further provided with an outer hook surface 221 and an inner hook surface 222 connected in sequence. The first side of the outer hook surface 221 is connected with the fixed ring segment 210, and the side of the outer hook surface 221 away from the center line of the elastic ring 20 is used to contact the inner wall surface of the cylinder sleeve 50. The inner hook surface 222 is located on the side of the outer hook surface 221 close to the center line of the elastic ring 20 to contact the second ring wall surface 130. The second side of the outer hook surface 221 is connected with the first side of the inner hook surface 222, and the second side of the inner hook surface 222 is spaced apart from the outer hook surface 221 and the fixed ring segment 210.

[0042] The deformed ring segment 220 in the hook-like curved surface can form an elastic energy storage area between the outer hook surface 221 and the inner hook surface 222, thereby improving the structural strength and stability of the elastic ring 20, so that the elastic ring 20 can still maintain good performance when subjected to high pressure or high temperature. The cooperation of the outer hook surface 221 and the inner hook surface 222 enables the deformed ring segment 220 to dynamically deform under different working conditions, and adjusts the size of the gas flow gap 60 according to the change of the pressure in the combustion chamber, thereby realizing the one-way flow of the gas, effectively controlling the oil consumption and emission.

[0043] Specifically, the outer hook surface 221 is a first curved surface protruding in a direction away from the center line of the elastic ring 20. The protruding design of the outer hook surface 221 can tightly contact the inner wall surface of the cylinder sleeve 50 when the piston is ascending, thereby forming an effective sealing barrier to prevent gas and oil from flowing up from the gap between the ring and the cylinder wall, thereby significantly reducing oil consumption and improving combustion efficiency. The inner hook surface 222 is a second curved surface recessed in a direction close to the center line of the elastic ring 20. The recessed design of the inner hook surface 222 helps to further ensure the elastic tight contact between the outer hook surface 221 and the inner wall surface of the cylinder sleeve 50 by contacting the second ring wall surface 130 when the piston is descending. In addition, the combined arrangement of the outer hook surface 221 and the inner hook surface 222 can clean the excess oil on the inner wall of the cylinder sleeve 50 and uniformly distribute the oil, thereby improving the cleaning and oil distribution ability of the piston ring, reducing the formation of carbon deposits, and maintaining the cleanliness of the engine interior.

[0044] As Figure 4As shown, the first transition fillet 150 has a radius R1, and R1 is greater than or equal to 0.2 mm and less than or equal to 3 mm; and / or a second transition fillet 160 is arranged between the inner side of the connection between the fixed ring segment 210 and the deformed ring segment 220, and the second transition fillet 160 has a radius R2, and R2 is greater than or equal to 0.2 mm and less than or equal to 3 mm. The radii R1 and R2 of the first transition fillet 150 and the second transition fillet 160 are designed to be between 0.2 mm and 3 mm, which can effectively disperse stress and reduce the possibility of cracks at the connection, improve the overall structural stability and durability of the piston ring, ensure the cooperation between the elastic ring 20 and the main ring 10, reduce local stress concentration, and enhance the fatigue resistance of the piston ring.

[0045] Preferably, a third transition fillet 170 is arranged between the outer side of the connection between the outer hook surface 221 and the inner hook surface 222, and the third transition fillet 170 has a radius R3, and R3 is greater than or equal to 0.2 mm and less than or equal to 5 mm, which helps to improve the sealing performance between the deformed ring segment 220 and the inner wall surface of the cylinder liner 50, reduces the irregularity of the sealing surface through smooth curved surface contact, and improves the controllability of gas and oil flow.

[0046] Preferably, the contact point between the inner hook surface 222 and the second ring wall surface 130 is the J point, a predetermined straight line parallel to the center line of the elastic ring 20 is made through the J point, and the included angle between the predetermined straight line and the tangent of the inner wall surface of the outer hook surface 221 is a, and a is greater than or equal to 2 degrees and less than or equal to 45 degrees.

[0047] Preferably, the size of the inner hook surface 222 in the direction perpendicular to the center line of the elastic ring 20 is L, and L is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0048] When the gas pressure in the combustion chamber is lower than the crankcase gas pressure, the oil will rise with the gas flow, at this time, the elastic ring 20 is forced to open due to its own elastic force and the downward pressure, and the angle a and L increase, which increases the radial thickness of the piston ring, reduces the backlash between the piston ring and the piston ring groove, and reduces the gap between the deformed ring segment 220 and the cylinder liner 50, so that the gas and oil cannot normally pass through the gas flow gap 60 to rise.

[0049] When the gas pressure in the combustion chamber is higher than the gas pressure in the crankcase, the elastic ring 20 is forced to shrink by the upward pressure due to its own elasticity and the upward pressure, the upper side pressure forces the disc to shrink, the angle a is reduced, L is reduced, the radial thickness of the piston ring is reduced, the backlash of the piston ring and the piston ring groove is increased, and the gap between the deformed ring segment 220 and the cylinder sleeve 50 is increased, so that the gas can flow downward.

[0050] In the utility model, laser welding or electron beam welding is used between the main ring 10 and the elastic ring 20.

[0051] Specifically, the material of the elastic ring 20 is one or more of spring steel sheets (carbon steel, alloy steel, stainless steel) or resins (polytetrafluoroethylene PTFE, carbon fiber nylon or resin, high-performance plastic).

[0052] The utility model also provides a piston ring group, including piston ring, piston ring is above piston ring.

[0053] The utility model also provides a kind of engine, including piston ring group, piston ring group is above piston ring group.

[0054] The piston ring of the utility model is more suitable for natural gas, hydrogen and other clean fuel engine.

[0055] The utility model has the advantages that:

[0056] 1, the principle of preventing oil backflow by the elastic structure of the elastic ring 20 prevents the reverse flow of the lower gas and oil, realizes the one-way flow of gas and fluid, effectively reduces the risk of gas upflow and oil upflow under negative pressure in the combustion chamber.

[0057] 2, the piston ring group of the utility model integrates the advantages of scraper ring, rectangular ring, conical ring and eccentric barrel surface ring, has good stability, is beneficial to reducing oil consumption, has high reliability, solves the difficulty of arranging multiple piston rings (such as using four rings) due to limited piston height, does not need to increase the height of piston head, effectively reduces the height of engine.

[0058] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0059] The utility model provides a piston ring, which comprises a main ring 10, the main ring 10 is sleeved in the piston ring groove 40 of the piston 30, and a gas flow gap 60 is arranged between the main ring 10 and the cylinder sleeve 50 sleeved outside the piston 30; an elastic ring 20, the elastic ring 20 is deformable arranged on the main ring 10 and extends into the gas flow gap 60, so as to open or close the gas flow gap 60 by the deformation of the elastic ring 20.

[0060] It can be seen that the utility model discloses a main body ring 10 and elastic ring 20 are set up, through the synergies of elastic ring 20 and main body ring 10, the size of gas flow gap 60 can be effectively adjusted, under the positive pressure condition, the pressure in the combustion chamber is higher than the pressure of the crankcase, the gas flows from the combustion chamber to the crankcase, at this time, elastic ring 20 is in the free state, after being subjected to the downward pressure, elastic ring 20 will be deformed, and the gas flow gap 60 is opened, at this time, the gas flow gap 60 is enlarged, and the gas flow is allowed to pass through, when the engine is in the intake stage, the piston goes down, and the gas pressure in the combustion chamber rapidly drops, if the gas pressure of the crankcase is higher than the gas pressure in the combustion chamber, a pressure gradient will be formed, which promotes the oil to flow to the combustion chamber through the piston ring groove 40, the elastic ring 20 in the utility model can be deformed to close the gas flow gap 60 when being subjected to the upward pressure, and is tightly attached to the inner wall surface of the cylinder sleeve 50, the gas flow gap 60 is effectively reduced, the high-pressure gas and oil in the crankcase are effectively prevented from entering the combustion chamber, the combustion efficiency and the overall performance of the engine are improved, and the problem that the oil flows reversely into the combustion chamber when the engine is in the intake stage in the prior art is solved efficiently.

[0061] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0062] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application, unless otherwise specifically indicated. It will be further understood that the various drawings are not drawn to scale and that the dimensions of the various parts are not necessarily to scale with respect to one another. Techniques, methods, and apparatus known to those of ordinary skill can not be discussed in detail because such techniques, methods, and apparatus are considered to be part of the patent specification. In all examples shown and discussed herein, any specific value is to be interpreted as merely an example, and not as a limitation. Thus, other examples of the example embodiments can have different values. It is noted that like numbers and letters refer to like elements throughout the several views of the drawings and that one or more specific embodiments can not use all of the discussed features. Thus, throughout the drawings and the detailed description, those features that are considered to be important for understanding the example embodiments are highlighted.

[0063] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0064] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0065] In addition, it should be noted that the use of "first", "second" and the like to define parts only facilitates the differentiation of corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the protection scope of the present application.

[0066] The above only describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A piston ring characterized in that, The piston ring comprises: a main ring (10) sleeved in a piston ring groove (40) of a piston (30), and a gas flow gap (60) is arranged between the main ring (10) and a cylinder liner (50) sleeved outside the piston (30); an elastic ring (20) deformably arranged on the main ring (10) and extending into the gas flow gap (60) to open or close the gas flow gap (60) through deformation of the elastic ring (20).

2. The piston ring of claim 1, wherein An installation gap (70) is arranged between the main ring (10) and the piston ring groove (40), and part of the elastic ring (20) is arranged in the installation gap (70) to cooperate with the main ring (10) to realize sealing between the piston (30) and the cylinder liner (50).

3. The piston ring of claim 2, wherein The elastic ring (20) comprises a fixed ring segment (210) and a deformed ring segment (220) connected in sequence; wherein the fixed ring segment (210) is arranged in the installation gap (70), and the deformed ring segment (220) extends into the gas flow gap (60).

4. The piston ring of claim 3, wherein The main ring (10) comprises a first ring wall surface (110), a first connecting surface (120), a second ring wall surface (130) and a second connecting surface (140) connected in sequence, wherein the first ring wall surface (110) is in contact with an inner wall surface of the piston ring groove (40), at least part of the second ring wall surface (130) is in contact with the deformed ring segment (220), the first connecting surface (120) is in contact with the fixed ring segment (210), and the second connecting surface (140) is in contact with a bottom surface of the piston ring groove (40).

5. The piston ring according to claim 4, wherein a first transition round corner (150) is arranged between the second ring wall surface (130) and the first connecting surface (120); and / or the cross section of the fixed ring segment (210) is a rectangular cross section, and the fixed ring segment (210) comprises a third ring wall surface (211), a third connecting surface (212) and a fourth connecting surface (213) connected in sequence, wherein the third ring wall surface (211) is in contact with the inner wall surface of the piston ring groove (40), the third connecting surface (212) is in contact with a top surface of the piston ring groove (40), and the fourth connecting surface (213) is in contact with the first connecting surface (120); and / or The cross section of the deformed ring segment (220) is a hook-like curved surface, and an outer hook surface (221) and an inner hook surface (222) are sequentially arranged on the hook-like curved surface. The first side of the outer hook surface (221) is connected with the fixed ring segment (210), and the side of the outer hook surface (221) away from the center line of the elastic ring (20) is used to contact the inner wall surface of the cylinder liner (50). The inner hook surface (222) is located on the side of the outer hook surface (221) close to the center line of the elastic ring (20) to contact the second ring wall surface (130). The second side of the outer hook surface (221) is connected with the first side of the inner hook surface (222), and the second side of the inner hook surface (222) is spaced apart from the outer hook surface (221) and the fixed ring segment (210). The outer hook surface (221) is a first curved surface protruding towards the direction away from the center line of the elastic ring (20), and the inner hook surface (222) is a second curved surface recessed towards the direction close to the center line of the elastic ring (20).

6. The piston ring of claim 5, wherein the first transition fillet (150) has a radius R1, and R1 is greater than or equal to 0.2 mm and less than or equal to 3 mm; and / or a second transition fillet (160) is arranged between the inner side of the connection between the fixed ring segment (210) and the deformed ring segment (220), and the second transition fillet (160) has a radius R2, and R2 is greater than or equal to 0.2 mm and less than or equal to 3 mm; and / or a third transition fillet (170) is arranged between the outer side of the connection between the outer hook surface (221) and the inner hook surface (222), and the third transition fillet (170) has a radius R3, and R3 is greater than or equal to 0.2 mm and less than or equal to 5 mm.

7. The piston ring of claim 5, wherein the contact point between the inner hook surface (222) and the second ring wall surface (130) is a J point, a predetermined straight line passing through the J point is parallel to the center line of the elastic ring (20), and the included angle between the predetermined straight line and the tangent of the inner wall surface of the outer hook surface (221) is a, and a is greater than or equal to 2 degrees and less than or equal to 45 degrees.

8. The piston ring of claim 7, wherein the dimension of the inner hook surface (222) in the direction perpendicular to the center line of the elastic ring (20) is L, and L is greater than or equal to 0.5 mm and less than or equal to 5 mm.

9. A piston ring set comprising a piston ring, characterized in that The piston ring is the piston ring of any one of claims 1 to 8.

10. An engine comprising a piston ring set, characterized in that The piston ring set is the piston ring set of claim 9.

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