Piston assembly and engine

Abstract

The utility model discloses a piston assembly and engine. The piston assembly includes piston and piston assembly. The piston is provided with the first piston groove. The piston ring assembly includes the first air ring group, and the first air ring group is arranged in the first piston groove, and the first air ring group includes the first upper ring and the first lower ring, and the first upper ring is provided with the first closed mouth, and the first lower ring is provided with the second closed mouth, and the first closed mouth and the second closed mouth are in the circumferential of the first air ring group and are staggered first angle. The air sealing capacity of this piston assembly is strong, and the reliability is high.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, and in particular relates to a piston assembly and an engine. Background Technology

[0002] Air leakage is a very important indicator for engines. In recent years, as engines have been continuously reducing fuel consumption, increased air leakage has become an unavoidable problem.

[0003] For compression-ignition engines, increasing the compression ratio and combustion pressure to improve thermal efficiency is an important way to reduce fuel consumption. However, this also leads to excessive piston ring wear, resulting in increased leakage. For spark-ignition engines, continuously approaching the knock limit to improve thermal efficiency is another important way to reduce fuel consumption. However, this also leads to plastic deformation of the piston rings, resulting in increased leakage.

[0004] In the prior art, a piston assembly includes a piston and a piston ring assembly. For example... Figure 1 As shown, the piston ring assembly 20 includes a first compression ring 201, a second compression ring 202, and an oil ring 203. The first compression ring 201 primarily seals the gas. The second compression ring 202 assists in sealing the gas and scraping oil. The oil ring 203 primarily scrapes oil. In this piston ring assembly, if the first compression ring fails due to high pressure or knocking, the sealing capacity of the piston ring assembly drops sharply, leading to increased engine leakage. Utility Model Content

[0005] This utility model aims to at least partially solve one of the technical problems in the related art.

[0006] On one hand, embodiments of this application propose a piston assembly, including:

[0007] A piston, wherein the piston is provided with a first piston groove;

[0008] A piston ring assembly, the piston ring assembly including a first compression ring group disposed in the first piston groove, the first compression ring group including a first upper ring and a first lower ring, the first upper ring being provided with a first closed opening, the first lower ring being provided with a second closed opening, the first closed opening and the second closed opening being offset from each other by a first angle in the circumferential direction of the first compression ring group.

[0009] In some embodiments, the shape of the axial section of the first upper ring and the shape of the axial section of the first lower ring are both rectangular.

[0010] In some embodiments, the piston assembly further includes a first positioning pin, the first piston groove is provided with a first positioning hole, the first positioning pin is partially placed in the first positioning hole, and the first positioning pin is partially placed in the first closed opening to restrict the first upper ring from rotating along the axis of the piston.

[0011] In some embodiments, the first positioning pin is interference-fitted with the first positioning hole, and the first positioning pin is clearance-fitted with the first closed opening.

[0012] In some embodiments, the piston assembly further includes a second positioning pin, the first piston groove is provided with a second positioning hole, the second positioning pin is partially placed in the second positioning hole, and the second positioning pin is partially placed in the second closed opening to restrict the first lower ring from rotating along the axis of the piston.

[0013] In some embodiments, the second positioning pin is interference-fitted with the second positioning hole, and the second positioning pin is clearance-fitted with the second closed end.

[0014] In some embodiments, the piston is further provided with a second piston groove, which is spaced apart from the first piston groove along the axial direction of the piston. The piston assembly further includes a second gas ring assembly disposed in the second piston groove.

[0015] In some embodiments, the second air ring assembly includes a second upper ring and a second lower ring, the second upper ring being provided with a third closed opening and the second lower ring being provided with a fourth closed opening, the third closed opening and the fourth closed opening being offset from each other by a second angle in the circumferential direction of the second air ring assembly.

[0016] In some embodiments, the shape of the axial section of the second upper ring and the shape of the axial section of the second lower ring are both rectangular.

[0017] On the other hand, embodiments of this application also propose an engine including the piston assembly described above.

[0018] The piston assembly provided in this application includes a piston and a piston ring assembly. The piston has a first piston groove, and the piston ring assembly includes a first compression ring group, which includes a first upper ring and a first lower ring. The first upper ring has a first closed opening, and the first lower ring has a second closed opening. The first closed opening and the second closed opening are circumferentially offset by a first angle in the first compression ring group. Gas leaking from the first closed opening of the first upper ring can be blocked by the first lower ring, and the circumferential offset of the first closed opening and the second closed opening in the first compression ring group further extends the leakage path of the gas in the first compression ring group. Therefore, this piston assembly has strong sealing capability and high reliability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a piston assembly in the prior art;

[0021] Figure 2 This is a schematic diagram of the piston assembly provided in one embodiment of the present invention;

[0022] Figure 3 A cross-sectional view of a piston assembly provided in one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of a first gas ring assembly provided in one embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the second gas ring assembly provided in one embodiment of the present invention;

[0025] Figure 6 A schematic diagram of the structure of the first positioning pin provided in one embodiment of the present utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the second positioning pin provided in one embodiment of the present invention.

[0027] The annotations in the attached figures are explained as follows:

[0028] 10. Piston; 101. First piston groove; 102. Second piston groove; 103. Third piston groove;

[0029] 20. Piston ring assembly; 201. First compression ring; 202. Second compression ring; 203. Oil ring;

[0030] 1. First air ring group; 11. First upper ring; 111. First closed ring; 12. First lower ring; 121. Second closed ring;

[0031] 2. Second air ring group; 21. Second upper ring; 211. Third closed ring; 22. Second lower ring; 221. Fourth closed ring;

[0032] 3. First locating pin; 31. First chamfer;

[0033] 4. Second locating pin; 41. Second chamfer;

[0034] 5. First positioning hole;

[0035] 6. Second positioning hole;

[0036] θ1, the first angle;

[0037] θ2, the second angle. Detailed Implementation

[0038] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0039] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0040] Please see Figures 1 to 3 This embodiment provides a piston assembly, which includes a piston 10 and a piston ring assembly 20. The piston 10 is provided with a first piston groove 101. The piston ring assembly 20 includes a first compression ring group 1, which is disposed in the first piston groove 101. The first compression ring group 1 includes a first upper ring 11 and a first lower ring 12. The first upper ring 11 is provided with a first closed end 111, and the first lower ring 12 is provided with a second closed end 121. The first closed end 111 and the second closed end 121 are offset from each other by a first angle θ1 in the circumferential direction of the first compression ring group 1.

[0041] The piston assembly provided in this application includes a piston 10 and a piston ring assembly 20. The piston 10 is provided with a first piston groove 101. The piston ring assembly 20 includes a first gas ring group 1, which includes a first upper ring 11 and a first lower ring 12. The first upper ring 11 is provided with a first closed port 111, and the first lower ring 12 is provided with a second closed port 121. The first closed port 111 and the second closed port 121 are circumferentially offset by a first angle θ1 in the first gas ring group. Gas leaking from the first closed port 111 of the first upper ring 11 can be blocked by the first lower ring 12, and the circumferential offset of the first closed port 111 and the second closed port 121 by the first angle θ1 further extends the leakage path of gas in the first gas ring group 1. Therefore, this piston assembly has strong sealing capability and high reliability.

[0042] In some embodiments, the axial cross-section of the first upper ring 11 is rectangular. Of course, in other embodiments, the axial cross-section of the first upper ring 11 can also be circular or trapezoidal.

[0043] The axial section of the first upper ring 11 is obtained by intersecting the plane of its rotation axis with the first upper ring 11.

[0044] In some embodiments, the axial cross-section of the first lower ring 12 is rectangular. Of course, in other embodiments, the axial cross-section of the first lower ring 12 may also be circular or trapezoidal.

[0045] The axial section of the first lower ring 12 is obtained by intersecting the plane of its rotation axis with the first lower ring 12.

[0046] By setting the shape of the axial section of the first upper ring 11 and the shape of the axial section of the first lower ring 12 to be rectangular, on the one hand, the first upper ring 11 and the first lower ring 12 can fit more tightly with the first piston groove 101; on the other hand, the first upper ring 11 and the first lower ring 12 can fit more tightly together, increasing the sealing capacity and improving reliability.

[0047] Of course, in other embodiments, the shape of the axial section of the first upper ring 11 may be different from the shape of the axial section of the first lower ring 12.

[0048] In some embodiments, the first angle θ1 can be set to 90°-180°. For example, the first angle θ1 can be 90°, 120°, 150°, 180°, or a range of any two of the above values.

[0049] It is understandable that the larger the first angle θ1 is, the longer the leakage path of the gas in the first gas ring group 1, and the stronger the sealing ability of the first gas ring group 1.

[0050] In some embodiments, the first angle θ1 is 180°. By setting the first angle θ1 to 180°, the leakage path of the gas in the first gas ring assembly 1 is extended to the maximum extent, thereby further improving the sealing capability of the first gas ring assembly 1 and increasing the reliability of the piston assembly.

[0051] Please see Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7 In some embodiments, the piston assembly further includes a first positioning pin 3. The first piston groove 101 is provided with a first positioning hole 5. Part of the first positioning pin 3 is placed in the first positioning hole 5, and part of the first positioning pin 3 is placed in the first closed opening 111 to restrict the rotation of the first upper ring 11 along the piston axis. By providing the first positioning hole 5 in the piston groove, and inserting part of the first positioning pin 3 into the first positioning hole 5 and part of the first positioning pin 3 into the first closed opening 111, the relative positions of the first upper ring 11 and the first piston groove 101 are fixed through the first positioning pin 3, the first positioning hole 5, and the first closed opening 111, preventing the first upper ring 11 from rotating along the piston axis.

[0052] In some embodiments, a first chamfer 31 is provided at one end of the first positioning pin 3. By providing a first chamfer 31 at one end of the first positioning pin 3, a guiding function is provided when the first positioning pin 3 is inserted into the first positioning hole 5, making it convenient to insert the first positioning pin 3 into the first positioning hole 5.

[0053] In some embodiments, the first locating pin 3 is interference-fitted with the first locating hole 5, and the first locating pin 3 is clearance-fitted with the first closed end 111. By setting the first locating pin 3 and the first locating hole 5 to be interference-fitted, the first locating pin 3 is tightly connected to the piston. By setting the first locating pin 3 and the first closed end 111 to be clearance-fitted, damage to the first upper ring 11 is avoided when the first locating pin 3 is inserted into the first closed end 111.

[0054] In some embodiments, the piston assembly further includes a second positioning pin 4. The first piston groove 101 is provided with a second positioning hole 6. A portion of the second positioning pin 4 is positioned within the second positioning hole 6, and another portion is positioned within the second closed opening 121, thereby restricting the rotation of the first lower ring 12 along the piston axis. By providing the second positioning hole 6 in the piston groove, and by inserting a portion of the second positioning pin 4 into the second positioning hole 6 and a portion into the second closed opening 121, the relative positions of the first lower ring 12 and the first piston groove 101 are fixed via the second positioning pin 4, the second positioning hole 6, and the second closed opening 121, preventing the first lower ring 12 from rotating along the piston axis.

[0055] In some embodiments, a second chamfer 41 is provided at one end of the second positioning pin 4 into the second positioning hole 6. By providing a second chamfer 41 at one end of the second positioning pin 4, a guiding function is provided when the second positioning pin 4 is inserted into the second positioning hole 6, making it easier to insert the second positioning pin 4 into the second positioning hole 6.

[0056] In some embodiments, the second locating pin 4 is interference-fitted with the second locating hole 6, and the second locating pin 4 is clearance-fitted with the second closed end 121. By setting the second locating pin 4 and the second locating hole 6 to be interference-fitted, the second locating pin 4 is tightly connected to the piston. By setting the second locating pin 4 and the second closed end 121 to be clearance-fitted, damage to the first lower ring 12 is avoided when the second locating pin 4 is inserted into the second closed end 121.

[0057] By fixing the relative positions of the first upper ring 11 and the first piston groove 101, and fixing the relative positions of the first lower ring 12 and the first piston groove 101, the relative positions between the first closed port 111 and the second closed port 121 can be fixed, so that the first angle θ1 is always 180°, thereby ensuring that the leakage path of the gas in the first gas ring group 1 is always at its maximum, improving the sealing capacity of the first gas ring group 1 and increasing the reliability of the piston assembly.

[0058] Please see Figure 2 , Figure 3 and Figure 5 In some embodiments, the piston is further provided with a second piston groove 102. Along the axial direction of the piston, the second piston groove 102 is spaced apart from the first piston groove 101. The piston ring assembly 20 also includes a second gas ring group 2, which is disposed in the second piston groove 102. By providing a second piston groove 102 on the piston and disposing of the second gas ring group 2 within the second piston groove 102, the sealing capability of the piston ring assembly 20 can be further increased, thereby improving the reliability of the piston assembly.

[0059] In some embodiments, the second gas ring assembly 2 includes a second upper ring 21 and a second lower ring 22. The second upper ring 21 is provided with a third closed port 211, and the second lower ring 22 is provided with a fourth closed port 221. The third closed port 211 and the fourth closed port 221 are staggered. By configuring the second gas ring assembly 2 to include a second upper ring 21 and a second lower ring 22, with the second upper ring 21 provided with a third closed port 211 and the second lower ring 22 provided with a fourth closed port 221, and the third closed port 211 and the fourth closed port 221 being circumferentially offset by a second angle θ2 in the second gas ring assembly 2, gas leaking from the third closed port 211 of the second upper ring 21 can be blocked by the second lower ring 22. Furthermore, the gas leakage path is further extended due to the third closed port 211 and the fourth closed port 221 being circumferentially offset by a second angle θ2 in the second gas ring assembly 2, which can further increase the sealing capacity of the piston ring assembly 20 and improve the reliability of the piston assembly.

[0060] In some embodiments, the axial cross-section of the second upper ring 21 is rectangular. Of course, in other embodiments, the axial cross-section of the second upper ring 21 can also be circular or trapezoidal.

[0061] The axial section of the second upper ring 21 is obtained by intersecting the plane of its rotation axis with the second upper ring 21.

[0062] In some embodiments, the axial cross-section of the second lower ring 22 is rectangular. Of course, in other embodiments, the axial cross-section of the second lower ring 22 may also be circular or trapezoidal.

[0063] The axial section of the second lower ring 22 is obtained by intersecting the plane of its rotation axis with the second lower ring 22.

[0064] By setting the shape of the axial section of the second upper ring 21 and the axial section of the second lower ring 22 to be rectangular, on the one hand, the second upper ring 21 and the second lower ring 22 can fit more tightly with the second piston groove 102; on the other hand, the second upper ring 21 and the second lower ring 22 can fit more tightly together, increasing the sealing capacity and improving reliability.

[0065] Of course, in other embodiments, the shape of the axial section of the second upper ring 21 may be different from the shape of the axial section of the second lower ring 22.

[0066] In some embodiments, the second angle θ2 can be set to 90°-180°. For example, the second angle θ2 can be 90°, 120°, 150°, 180°, or a range of any two of the above values.

[0067] It is understandable that the larger the second angle θ2 is, the longer the leakage path of the gas in the second gas ring group 2, and the stronger the sealing ability of the second gas ring group 2.

[0068] In some embodiments, the second angle θ2 is 180°. By making the second angle θ2 180°, the leakage path of the gas in the second gas ring assembly 2 is extended to the maximum extent, thereby further improving the sealing capability of the second gas ring assembly 2 and increasing the reliability of the piston assembly.

[0069] In some embodiments, the piston assembly further includes a third positioning pin. The second piston groove 102 is provided with a third positioning hole. The third positioning pin is partially placed in the third positioning hole and partially placed in the third closed opening 211 to restrict the second upper ring 21 from rotating along the piston axis. By providing a third positioning hole in the second piston groove 102, and inserting the third positioning pin partially into the third positioning hole and partially into the third closed opening 211, the relative positions of the second upper ring 21 and the second piston groove 102 are fixed through the third positioning pin, the third positioning hole, and the third closed opening 211, thus preventing the second upper ring 21 from rotating along the piston axis.

[0070] In some embodiments, a third chamfer is provided at one end of the third locating pin. By providing a third chamfer at one end of the third locating pin, a guiding function is provided when the third locating pin is inserted into the third locating hole, making it easier to insert the third locating pin into the third locating hole.

[0071] In some embodiments, the third locating pin is interference-fitted with the third locating hole, and the third locating pin is clearance-fitted with the third closed end 211. By setting the interference fit between the third locating pin and the third locating hole, the third locating pin is tightly connected to the piston. By setting the clearance fit between the third locating pin and the third closed end 211, damage to the second upper ring 21 is avoided when the third locating pin is inserted into the third closed end 211.

[0072] In some embodiments, the piston assembly further includes a fourth locating pin. The second piston groove 102 is provided with a fourth locating hole. The fourth locating pin is partially placed in the fourth locating hole and partially placed in the fourth closed opening 221 to restrict the second lower ring 22 from rotating along the piston axis. By providing a fourth locating hole in the second piston groove 102, and inserting the fourth locating pin partially into the fourth locating hole and partially into the fourth closed opening 221, the relative position of the second lower ring 22 and the second piston groove 102 is fixed through the fourth locating pin, the fourth locating hole, and the fourth closed opening 221, thus preventing the second lower ring 22 from rotating along the piston axis.

[0073] In some embodiments, a fourth chamfer is provided at one end of the fourth locating pin. By providing a fourth chamfer at one end of the fourth locating pin, a guiding function is provided when the fourth locating pin is inserted into the fourth locating hole, making it easier to insert the fourth locating pin into the fourth locating hole.

[0074] In some embodiments, the fourth locating pin is interference-fitted with the fourth locating hole, and the fourth locating pin is clearance-fitted with the fourth closed port 221. By setting the interference fit between the fourth locating pin and the fourth locating hole, the fourth locating pin is tightly connected to the piston. By setting the clearance fit between the fourth locating pin and the fourth closed port 221, damage to the second lower ring 22 is avoided when the fourth locating pin is inserted into the fourth closed port 221.

[0075] By fixing the relative positions of the second upper ring 21 and the second piston groove 102, and fixing the relative positions of the second lower ring 22 and the second piston groove 102, the relative positions between the third closed port 211 and the fourth closed port 221 can be fixed, so that the second angle θ2 is always 180°, thereby ensuring that the leakage path of the gas in the second gas ring group 2 is always at its maximum, improving the sealing capacity of the second gas ring group 2 and increasing the reliability of the piston assembly.

[0076] In some embodiments, the piston is further provided with a third piston groove 103. Along the axial direction of the piston, the third piston groove 103 is spaced apart from the first piston groove 101 and the second piston groove 102. The piston ring assembly 20 also includes an oil ring assembly disposed in the third piston groove 103. By providing the oil ring assembly and placing it in the third piston groove 103, on the one hand, it can play a role in scraping oil; on the other hand, it can further increase the sealing capacity of the piston ring assembly 20 and improve the reliability of the piston assembly.

[0077] In some embodiments, the oil ring assembly includes a third upper ring and a third lower ring. A fifth closed port is provided on the third upper ring, and a sixth closed port is provided on the third lower ring. The fifth and sixth closed ports are circumferentially offset by a third angle in the oil ring assembly. By providing a fifth closed port on the third upper ring and a sixth closed port on the third lower ring, and by offsetting the fifth and sixth closed ports circumferentially by a third angle in the oil ring assembly, gas leaking from the fifth closed port of the third upper ring can be blocked by the third lower ring. Furthermore, the circumferential offset of the fifth and sixth closed ports further extends the gas leakage path within the oil ring assembly. Therefore, this piston assembly has strong sealing capability and high reliability.

[0078] In some embodiments, the shape of the axial cross-section of the third upper ring can be circular, rectangular, or trapezoidal. Optionally, the shape of the axial cross-section of the third upper ring is rectangular.

[0079] In some embodiments, the shape of the axial cross-section of the third lower ring can be circular, rectangular, or trapezoidal. Optionally, the shape of the axial cross-section of the third lower ring is rectangular.

[0080] In some embodiments, the shape of the axial section of the third upper ring may be the same as or different from the shape of the axial section of the third lower ring. Optionally, the shape of the axial section of the third upper ring may be the same as the shape of the axial section of the third lower ring.

[0081] In some embodiments, the third angle can be 90°-180°. For example, the third angle can be 90°, 120°, 150°, 180°, or a range of any two of the above values.

[0082] Understandably, the larger the third angle, the longer the leakage path of the gas in the oil ring assembly, and the stronger the gas sealing capability of the oil ring assembly.

[0083] In some embodiments, the third angle is 180°. By setting the third angle to 180°, the leakage path of the gas in the oil ring assembly is maximized, further improving the sealing capability of the oil ring assembly and increasing the reliability of the piston assembly.

[0084] In some embodiments, the piston assembly further includes a fifth locating pin, and the third piston groove 103 is provided with a fifth locating hole. A portion of the fifth locating pin is placed in the fifth locating hole, and a portion of the fifth locating pin is placed in the fifth closed opening, to restrict the rotation of the third upper ring along the piston axis. By providing a fifth locating hole in the piston groove, and inserting a portion of the fifth locating pin into the fifth locating hole and a portion into the fifth closed opening, the relative position of the third upper ring and the third piston groove 103 is fixed through the fifth locating pin, the fifth locating hole, and the fifth closed opening, preventing the third upper ring from rotating along the piston axis.

[0085] In some embodiments, a fifth chamfer is provided at one end of the fifth locating pin. By providing a fifth chamfer at one end of the fifth locating pin, a guiding function is provided when the fifth locating pin is inserted into the fifth locating hole, making it easier to insert the fifth locating pin into the fifth locating hole.

[0086] In some embodiments, the fifth locating pin is interference-fitted with the fifth locating hole, and the fifth locating pin is clearance-fitted with the fifth closed end. By setting the fifth locating pin and the fifth locating hole to be interference-fitted, the fifth locating pin is tightly connected to the piston. By setting the fifth locating pin and the fifth closed end to be clearance-fitted, damage to the third upper ring is avoided when the fifth locating pin is inserted into the fifth closed end.

[0087] In some embodiments, the piston assembly further includes a sixth locating pin, and the third piston groove 103 is provided with a sixth locating hole. A portion of the sixth locating pin is placed in the sixth locating hole, and a portion of the sixth locating pin is placed in the sixth closed opening, to restrict the rotation of the third lower ring along the piston axis. By providing a sixth locating hole in the piston groove, and inserting a portion of the sixth locating pin into the sixth locating hole and a portion into the sixth closed opening, the relative position of the third lower ring and the third piston groove 103 is fixed through the sixth locating pin, the sixth locating hole, and the sixth closed opening, preventing the third lower ring from rotating along the piston axis.

[0088] In some embodiments, a sixth chamfer is provided at one end of the sixth locating pin that inserts into the sixth locating hole. By providing a sixth chamfer at one end of the sixth locating pin, a guiding function is provided when the sixth locating pin is inserted into the sixth locating hole, making it easier to insert the sixth locating pin into the sixth locating hole.

[0089] In some embodiments, the sixth locating pin is interference-fitted with the sixth locating hole, and the sixth locating pin is clearance-fitted with the sixth closed end. By setting the sixth locating pin and the sixth locating hole to be interference-fitted, the sixth locating pin is tightly connected to the piston. By setting the sixth locating pin and the sixth closed end to be clearance-fitted, damage to the third lower ring is prevented when the sixth locating pin is inserted into the sixth closed end.

[0090] By fixing the relative positions of the third upper ring and the third piston groove 103, and fixing the relative positions of the third lower ring and the third piston groove 103, the relative positions between the fifth and sixth closed ports can be fixed, so that the third angle is always 180°. This ensures that the leakage path of the gas in the oil ring assembly is always at its maximum, improving the sealing capability of the oil ring assembly and increasing the reliability of the piston assembly.

[0091] An engine includes the piston assembly described above. Because the engine includes the piston assembly described above, it has the advantages of strong sealing capability and high reliability.

[0092] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0094] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0095] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0096] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0097] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A piston assembly, characterized in that, include: A piston, wherein the piston is provided with a first piston groove; A piston ring assembly, the piston ring assembly including a first compression ring group disposed in the first piston groove, the first compression ring group including a first upper ring and a first lower ring, the first upper ring being provided with a first closed opening, the first lower ring being provided with a second closed opening, the first closed opening and the second closed opening being offset from each other by a first angle in the circumferential direction of the first compression ring group.

2. The piston assembly according to claim 1, characterized in that, The shape of the axial section of the first upper ring and the shape of the axial section of the first lower ring are both rectangular.

3. The piston assembly according to claim 1, characterized in that, The piston assembly further includes a first positioning pin, the first piston groove is provided with a first positioning hole, the first positioning pin is partially placed in the first positioning hole, and the first positioning pin is partially placed in the first closed opening to restrict the first upper ring from rotating along the axis of the piston.

4. The piston assembly according to claim 3, characterized in that, The first locating pin is interference-fitted with the first locating hole, and the first locating pin is clearance-fitted with the first closed opening.

5. The piston assembly according to claim 1, characterized in that, The piston assembly also includes a second locating pin. The first piston groove is provided with a second locating hole. The second locating pin is partially placed in the second locating hole and partially placed in the second closed opening to restrict the first lower ring from rotating along the axis of the piston.

6. The piston assembly according to claim 5, characterized in that, The second locating pin is interference-fitted with the second locating hole, and the second locating pin is clearance-fitted with the second closed end.

7. The piston assembly according to claim 1, characterized in that, The piston is also provided with a second piston groove, which is spaced apart from the first piston groove along the axial direction of the piston. The piston ring assembly also includes a second gas ring group, which is disposed in the second piston groove.

8. The piston assembly according to claim 7, characterized in that, The second air ring assembly includes a second upper ring and a second lower ring. A third closed opening is provided on the second upper ring, and a fourth closed opening is provided on the second lower ring. The third closed opening and the fourth closed opening are offset by a second angle in the circumferential direction of the second air ring assembly.

9. The piston assembly according to claim 8, characterized in that, The shape of the axial section of the second upper ring and the shape of the axial section of the second lower ring are both rectangular.

10. An engine, characterized in that, Includes the piston assembly as described in any one of claims 1-9.

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