A cylinder liner sealing structure and an engine

Abstract

The present invention relates to the technical field of engines, and specifically discloses a cylinder liner sealing structure and an engine. The cylinder liner sealing structure includes a cylinder liner, a cylinder block, and a cylinder liner sealing ring. The cylinder block is sleeved outside the cylinder liner, and the cylinder liner sealing ring is arranged between the cylinder liner and the cylinder block, and the cylinder liner sealing ring is located in the sealing ring groove of the cylinder liner. The cylinder liner sealing ring includes an inner side wall, a top wall, an outer side wall, and a bottom wall. Along the axial direction of the cylinder liner sealing ring, both ends of the inner side wall and both ends of the outer side wall are respectively connected to the top wall and the bottom wall; the cross-sections of the inner side wall and the outer side wall are both wavy. The inner side wall includes a plurality of first wave peaks arranged at intervals, and the first wave peaks are in contact with the bottom wall of the sealing ring groove. A plurality of first wave peaks form multiple seals with the cylinder liner. The outer side wall includes a plurality of second wave peaks arranged at intervals, and the second wave peaks are in contact with the cylinder block. A plurality of second wave peaks form multiple seals with the cylinder block. The sealing effect is stable. At the same time, during installation, the cylinder liner sealing ring is in line contact with the cylinder block, which can avoid torsion.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to a cylinder liner sealing structure and an engine. Background Art

[0002] Diesel engines mainly drive the rotation of the crankshaft through the reciprocating motion of the piston rod up and down to achieve the purpose of power output. Among them, the piston reciprocates along the inner wall of the cylinder liner. During the movement, the pressure in the cylinder changes periodically, and the lateral thrust generated by the reciprocating motion of the piston also changes periodically. There is a gap between the piston and the cylinder liner, and the piston generates yaw and continuously impacts the cylinder liner wall, thereby causing high-frequency vibration of the cylinder liner. The cylinder liner sealing ring of a high explosion pressure engine is also affected by the vibration of the cylinder liner, which affects the sealing performance of the cylinder liner sealing ring.

[0003] Traditional cylinder liner sealing rings usually have a rectangular cross-section or an elliptical cross-section. Usually, only one seal can be formed between the traditional cylinder liner sealing ring and the engine block, and the risk of poor sealing is relatively high. Moreover, under the action of vibration, it is easy to wear after long-term use, especially the sealing ring on the upper part of the cylinder liner, which also bears high temperature and is more likely to be worn and cause the outer layer to peel off, thereby leading to seal failure and affecting the reliability of the engine. Summary of the Invention

[0004] The purpose of the present invention is to provide a cylinder liner sealing structure and an engine to solve the problem that traditional cylinder liner sealing rings usually have a rectangular cross-section or an elliptical cross-section, and usually only one seal can be formed between the cylinder liner sealing ring and the engine block, and the risk of poor sealing is relatively high.

[0005] On the one hand, the present invention provides a cylinder liner sealing structure, which includes a cylinder liner, an engine block sleeved outside the cylinder liner, and a cylinder liner sealing ring arranged between the cylinder liner and the engine block. The cylinder liner sealing ring is located in the sealing ring groove of the cylinder liner. The cylinder liner sealing ring includes an inner side wall, a top wall, an outer side wall, and a bottom wall. The top wall and the bottom wall are respectively located at both ends of the cylinder liner sealing ring in the axial direction. The inner side wall and the outer side wall both extend along the axial direction of the cylinder liner sealing ring and their cross-sections are both wavy. Both ends of the inner side wall are respectively connected to one end of the top wall and one end of the bottom wall, and both ends of the outer side wall are respectively connected to the other end of the top wall and the other end of the bottom wall;

[0006] The inner side wall includes a plurality of first wave peaks arranged at intervals, and first wave valleys connected between any two adjacent first wave peaks. The first wave peaks are in contact with the bottom wall of the sealing ring groove. The outer side wall includes a plurality of second wave peaks arranged at intervals, and second wave valleys connected between any two adjacent second wave peaks. The second wave peaks are in contact with the engine block.

[0007] As a preferred technical solution of the cylinder liner sealing structure, the distance between the second wave crest and the second wave trough is l1, and l1 ≤ 0.5 mm.

[0008] As a preferred technical solution of the cylinder liner sealing structure, the axis of the cylinder liner sealing ring is in the vertical direction. In the cross-section of the cylinder liner sealing ring, the top wall is arc-shaped, the top wall is tangent to the outer side wall, and the tangent of the point where the top wall is connected to the outer side wall forms an angle θ with the horizontal plane, and 20° ≤ θ ≤ 30°.

[0009] As a preferred technical solution of the cylinder liner sealing structure, the cylinder liner has a first outer side wall above the cylinder liner sealing groove and a second outer side wall below the cylinder liner sealing groove, the engine block has a first inner side wall and a second inner side wall below the first inner side wall, the first outer side wall and the first inner side wall are in contact, there is a gap between the second inner side wall and the second outer side wall to form a coolant flow channel, and the coolant flow channel is communicated with the sealing ring groove.

[0010] As a preferred technical solution of the cylinder liner sealing structure, the engine block further has a conical side wall connected above the first inner side wall, the distance between the conical side wall and the first outer side wall gradually decreases from top to bottom, and the height of the conical side wall in the vertical direction is L1, and 1.5 mm ≤ L1 ≤ 2 mm.

[0011] As a preferred technical solution of the cylinder liner sealing structure, the height of the part where the first inner side wall is in contact with the first outer side wall is L2, and 2.5 mm ≤ L2 ≤ 3.5 mm.

[0012] As a preferred technical solution of the cylinder liner sealing structure, the width of the sealing ring groove is L3, and the depth of the sealing ring groove is W1, 3 mm ≤ L3 ≤ 4.5 mm; 1 mm ≤ W1 ≤ 1.8 mm.

[0013] As a preferred technical solution of the cylinder liner sealing structure, the coolant flow channel includes a first flow channel communicated with the sealing ring groove and a second flow channel communicated with the first flow channel. In the vertical direction, the width dimension of the first flow channel is equal everywhere, and the width of the second flow channel gradually increases.

[0014] As a preferred technical solution of the cylinder liner sealing structure, the width of the first flow channel is W2, and the height of the first flow channel is L4, 0.8 mm ≤ L4 ≤ 1.5 mm; 0.3 mm ≤ W2 ≤ 0.6 mm.

[0015] On the other hand, the present invention provides an engine including the cylinder liner sealing structure in any of the above solutions.

[0016] The beneficial effects of the present invention are:

[0017] The present invention provides a cylinder liner sealing structure and an engine. The cylinder liner sealing structure includes a cylinder liner, a cylinder block, and a cylinder liner sealing ring. Among them, the cylinder block is sleeved outside the cylinder liner, the cylinder liner sealing ring is arranged between the cylinder liner and the cylinder block, and the cylinder liner sealing ring is located in the sealing ring groove of the cylinder liner. The cylinder liner sealing ring includes an inner side wall, a top wall, an outer side wall, and a bottom wall. The top wall and the bottom wall are respectively located at both ends of the cylinder liner sealing ring in the axial direction. The inner side wall and the outer side wall both extend along the axial direction of the cylinder liner sealing ring and the cross-sections thereof are both wavy. Two ends of the inner side wall are respectively connected to one end of the top wall and one end of the bottom wall, and two ends of the outer side wall are respectively connected to the other end of the top wall and the other end of the bottom wall. The inner side wall includes a plurality of first wave peaks arranged at intervals, and first wave valleys connecting between any two first wave peaks. The first wave peaks are in contact with the bottom wall of the sealing ring groove. The outer side wall includes a plurality of second wave peaks arranged at intervals, and second wave valleys connecting between any two second wave peaks. The second wave peaks are in contact with the cylinder block. With such an arrangement, multiple seals are formed between the plurality of second wave peaks and the cylinder block, and multiple seals are formed between the plurality of first wave peaks and the cylinder liner, which can ensure stable sealing effect. At the same time, during installation, the cylinder liner sealing ring is in line contact with the cylinder block, and the contact surface between the cylinder block and the cylinder liner sealing ring will be reduced, which can avoid the cylinder liner sealing ring from being twisted during installation, thereby ensuring the service life of the cylinder liner sealing ring and further ensuring the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a partial cross-sectional view of the cylinder liner sealing structure in an embodiment of the present invention Figure 1 ;

[0019] Figure 2 is a partial cross-sectional view of the cylinder liner sealing structure in an embodiment of the present invention Figure 2 ;

[0020] Figure 3 is a schematic structural view of the cylinder liner sealing ring in the cylinder liner sealing structure in an embodiment of the present invention;

[0021] Figure 4 is a cross-sectional view of the cylinder liner in the cylinder liner sealing structure in an embodiment of the present invention;

[0022] Figure 5 is a cross-sectional view of the cylinder block in the cylinder liner sealing structure in an embodiment of the present invention.

[0023] In the figure:

[0024] 1, cylinder liner; 2, cylinder block; 3, cylinder liner sealing ring; 4, coolant flow channel;

[0025] 11, first outer side wall; 12, second outer side wall; 13, sealing ring groove;

[0026] 21, first inner side wall; 22, second inner side wall; 23, tapered side wall;

[0027] 31. Inner wall; 311. First peak; 312. First valley; 32. Outer wall; 321. Second peak; 322. Second valley; 33. Top wall; 34. Bottom wall;

[0028] 41. First flow channel; 42. Second flow channel. Detailed implementation manners

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0033] Traditional cylinder liner sealing rings usually have a rectangular cross-section or an oval cross-section. Usually, only one seal can be formed between the traditional cylinder liner sealing ring and the engine block, and the risk of poor sealing is relatively high. Moreover, under the action of vibration, it is prone to wear after long-term use. Especially the sealing ring on the upper part of the cylinder liner also has to withstand high temperature, which is more likely to exacerbate wear and cause the outer layer to peel off, thereby leading to seal failure and affecting the reliability of the engine.

[0034] In view of this, the present embodiment provides a cylinder liner sealing structure to solve the above problems, which can prevent poor sealing, prevent wear of the cylinder liner sealing ring, and also prevent the cylinder liner sealing ring from twisting during installation. This cylinder liner sealing structure can be applied to an engine.

[0035] As Figures 1 to 5 shown, the cylinder liner sealing structure includes a cylinder liner 1, an engine block 2, and a cylinder liner sealing ring 3. Among them, the engine block 2 is sleeved outside the cylinder liner 1, the cylinder liner sealing ring 3 is arranged between the cylinder liner 1 and the engine block 2, and the cylinder liner sealing ring 3 is located in the sealing ring groove 13 of the cylinder liner 1, and seals are formed by the cylinder liner sealing ring 3 abutting against the engine block 2 and the cylinder liner 1 respectively.

[0036] Specifically, as Figure 3 shown, the cylinder liner sealing ring 3 includes an inner side wall 31, a top wall 33, an outer side wall 32, and a bottom wall 34. The top wall 33 and the bottom wall 34 are respectively located at both axial ends of the cylinder liner sealing ring 3. Both the inner side wall 31 and the outer side wall 32 extend along the axis of the cylinder liner sealing ring 3 and their cross-sections are both wavy. Two ends of the inner side wall 31 are respectively connected to one end of the top wall 33 and one end of the bottom wall 34, and two ends of the outer side wall 32 are respectively connected to the other end of the top wall 33 and the other end of the bottom wall 34. In this embodiment, the inner side wall 31, the outer side wall 32, the top wall 33, and the bottom wall 34 are of a ring structure, and the cross-section is any plane passing through the axis of the cylinder liner sealing ring 3.

[0037] In this embodiment, the inner side wall 31 includes a plurality of first wave peaks arranged at intervals, and first wave valleys connecting between any two adjacent first wave peaks. The first wave peaks are in contact with the bottom wall 34 of the sealing ring groove 13. The outer side wall 32 includes a plurality of second wave peaks arranged at intervals, and second wave valleys connecting between any two adjacent second wave peaks. The second wave peaks are in contact with the engine block 2. With such an arrangement, multiple seals are formed between the plurality of second wave peaks and the engine block 2, and multiple seals are formed between the plurality of first wave peaks and the cylinder liner 1, which can ensure the stability of the sealing effect. At the same time, during installation, the cylinder liner sealing ring 3 is in line contact with the engine block 2, and the contact surface between the engine block 2 and the cylinder liner sealing ring 3 will be reduced, which can avoid the cylinder liner sealing ring 3 from twisting during the installation process, thereby ensuring the service life of the cylinder liner sealing ring 3 and further ensuring the sealing effect.

[0038] In this embodiment, the number of the first wave valleys is one less than that of the first wave peaks, the number of the second wave valleys is one less than that of the second wave peaks, and the number of the first wave peaks is equal to that of the second wave peaks. It can be understood that both ends of the inner side wall 31 are two first wave peaks, and the two first wave peaks are respectively connected to the top wall 33 and the bottom wall 34. Both ends of the outer side wall 32 are two second wave peaks, and the two second wave peaks are respectively connected to the top wall 33 and the bottom wall 34. In this embodiment, an exemplary solution is given where the number of both the first wave peaks and the second wave peaks is two, and the number of both the first wave valleys and the second wave valleys is one. In other embodiments, the number of the first wave peaks and the number of the second wave peaks can also be set as required.

[0039] In this embodiment, the axis of the cylinder liner 1 is in the vertical direction. During actual use, the first wave peaks and the second wave peaks at the top can play a dust-proof role, and the first wave peaks and the second wave peaks at the bottom can play a role in sealing the coolant. It should be noted that taking the first wave peak as an example, if there is a problem with the seal of one of the first wave peaks, the other first wave peak can still play the roles of sealing the coolant and dust-proofing simultaneously, achieving a redundant effect.

[0040] In this embodiment, the cylinder liner seal ring 3 is symmetrically arranged up and down, that is, both the inner side wall 31 and the outer side wall 32 are symmetrically arranged in the vertical direction, and the top wall 33 and the bottom wall 34 are symmetrically arranged in the vertical direction. Therefore, there is no need to consider the problem of reverse installation of the cylinder liner seal ring 3 during use. Preferably, in the cross-section of the cylinder liner seal ring 3, the profiles of the inner side wall 31 and the outer side wall 32 of the cylinder liner seal ring 3 are also symmetrically arranged. Specifically, the cross-section of the cylinder liner seal ring 3 is similar to a dumbbell shape.

[0041] In this embodiment, in the cross-section of the cylinder liner seal ring 3, both the top wall 33 and the bottom wall 34 are arc-shaped, and the connections between the inner side wall 31 and the top wall 33 and the bottom wall 34 are all smoothly transitioned. The connections between the outer side wall 32 and the top wall 33 and the bottom wall 34 are all smoothly transitioned, that is, the inner side wall 31 is tangent to the top wall 33 and the bottom wall 34 respectively, and the outer side wall 32 is tangent to the top wall 33 and the bottom wall 34 respectively.

[0042] In the cross-section of the cylinder liner seal ring 3, the angle between the tangent of the point where the top wall 33 is connected to the outer side wall 32 and the horizontal plane is θ, and 20° ≤ θ ≤ 30°. θ can be 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29° or 30°. Since the cylinder liner seal ring 3 is symmetrically arranged up and down and symmetrically arranged inside and outside, in the cross-section of the cylinder liner seal ring 3, the angles between the tangents of the points where the top wall 33 is connected to the inner side wall 31, the bottom wall 34 is connected to the outer side wall 32, and the bottom wall 34 is connected to the inner side wall 31 and the horizontal plane are all θ. Such an arrangement can ensure that during the relative movement of the cylinder liner 1 and the engine block 2, the cylinder liner seal ring 3 will not enter between the first outer side wall 11 and the first inner side wall 21.

[0043] The distance between the second peak and the second trough is l1, and l1 ≤ 0.5 mm. l1 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm. By making l1 ≤ 0.5 mm, the service life of the cylinder liner seal ring 3 can be ensured, because when the size of l1 is too large, it is easy to cause wrinkles in the cylinder liner seal ring 3 itself. In addition, by making l1 ≤ 0.5 mm and 20° ≤ θ ≤ 30°, wear can be minimized while ensuring the stable sealing performance of the cylinder liner seal ring 3.

[0044] Optionally, the engine block 2 also has a tapered side wall 23 connected above the first inner side wall 21, and the distance between the tapered side wall 23 and the first outer side wall 11 gradually decreases from top to bottom. Among them, the height of the tapered side wall 23 in the vertical direction is L1, and 1.5 mm ≤ L1 ≤ 2 mm. L1 can be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm.

[0045] Optionally, the height of the part where the first inner side wall 21 is in contact with the first outer side wall 11 is L2, and 2.5 mm ≤ L2 ≤ 3.5 mm. Among them, L2 can be 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm or 3.5 mm. By making 2.5 mm ≤ L2 ≤ 3.5 mm, the overall stiffness of the cylinder liner sealing structure can be ensured.

[0046] Optionally, the width of the sealing ring groove 13 is L3, and the depth of the sealing ring groove 13 is W1, where 3 mm ≤ L3 ≤ 4.5 mm; 1 mm ≤ W1 ≤ 1.8 mm. Among them, L3 can be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm or 4.5 mm; W1 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm or 1.8 mm.

[0047] Optionally, the coolant flow channel 4 includes a first flow channel 41 communicating with the sealing ring groove 13 and a second flow channel 42 communicating with the first flow channel 41. In the vertical direction, the width dimension of the first flow channel 41 is equal everywhere, and the width of the second flow channel 42 gradually increases. Among them, the second flow channel 42 is used to guide the coolant to flow towards the first flow channel 41, and the first flow channel 41 is used to transport the coolant to the sealing ring groove 13. As Figure 2 shown, in the cross-section of the cooling flow channel, the boundary line on one side of the cylinder liner 1 includes a first straight line and a first arc line. The first straight line connects the sealing ring groove 13, and the first straight line extends along the vertical direction. The first arc line connects the lower end of the first straight line and is recessed towards the inside of the cylinder liner 1; the boundary line on one side of the engine block 2 includes a second straight line, a second arc line and a third straight line. The second straight line is parallel to the first straight line. The second arc line connects the lower end of the second straight line and is recessed towards the inside of the engine block 2. The third straight line is tangent to the lower part of the second arc line and extends along the vertical direction. Among them, in the vertical direction, the height of the intersection point of the first straight line and the first arc line is located between the top end and the bottom end of the second arc line. Such a setting can make the second flow channel 42 have a better drainage effect.

[0048] The width of the first flow channel 41 is W2, and the height of the first flow channel 41 is L4, where 0.8 mm ≤ L4 ≤ 1.5 mm; 0.3 mm ≤ W2 ≤ 0.6 mm. Among them, L4 can be 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm; W2 can be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm or 0.6 mm. This can better cool the cylinder liner sealing ring 3, reduce the temperature of the cylinder liner sealing ring 3, and at the same time can better cool the first ring of the piston.

[0049] This embodiment also provides an engine, including the cylinder liner sealing structure in the above solution.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A cylinder liner sealing structure, comprising a cylinder liner (1), a cylinder block (2) sleeved outside the cylinder liner (1), and a cylinder liner sealing ring (3) arranged between the cylinder liner (1) and the cylinder block (2), wherein the cylinder liner sealing ring (3) is located in a sealing ring groove (13) of the cylinder liner (1), and is characterized in that, The cylinder liner sealing ring (3) includes an inner side wall (31), a top wall (33), an outer side wall (32), and a bottom wall (34). The top wall (33) and the bottom wall (34) are respectively located at two axial ends of the cylinder liner sealing ring (3). The inner side wall (31) and the outer side wall (32) both extend along the axial direction of the cylinder liner sealing ring (3) and their cross-sections are both wavy. Two ends of the inner side wall (31) are respectively connected to one end of the top wall (33) and one end of the bottom wall (34). Two ends of the outer side wall (32) are respectively connected to the other end of the top wall (33) and the other end of the bottom wall (34); The inner side wall (31) includes a plurality of first wave peaks arranged at intervals, and first wave valleys connected between any two adjacent first wave peaks. The first wave peaks are in contact with the bottom wall (34) of the sealing ring groove (13). The outer side wall (32) includes a plurality of second wave peaks arranged at intervals, and second wave valleys connected between any two adjacent second wave peaks. The second wave peaks are in contact with the body (2); The distance between the second wave peaks and the second wave valleys is l1, and l1 ≤ 0.5 mm; The cylinder liner (1) has a first outer side wall (11) above the sealing groove of the cylinder liner (1) and a second outer side wall (12) below the sealing groove of the cylinder liner (1). The body (2) has a first inner side wall (21) and a second inner side wall (22) below the first inner side wall (21). The first outer side wall (11) is in contact with the first inner side wall (21). There is a gap between the second inner side wall (22) and the second outer side wall (12) to form a coolant flow channel (4). The coolant flow channel (4) communicates with the sealing ring groove (13); The coolant flow channel (4) includes a first flow channel (41) communicating with the sealing ring groove (13) and a second flow channel (42) communicating with the first flow channel (41). Along the vertical direction, the width dimension of the first flow channel (41) is equal everywhere, and the width of the second flow channel (42) gradually increases; The width of the first flow channel (41) is W2, and the height of the first flow channel (41) is L4. 0.8 mm ≤ L4 ≤ 1.5 mm; 0.3 mm ≤ W2 ≤ 0.6 mm.

2. The cylinder liner sealing structure according to claim 1, wherein, The axial direction of the cylinder liner sealing ring (3) is along the vertical direction. In the cross-section of the cylinder liner sealing ring (3), the top wall (33) is arc-shaped. The top wall (33) is tangent to the outer side wall (32), and the tangent of the point where the top wall (33) is connected to the outer side wall (32) and the horizontal plane forms an angle θ, 20° ≤ θ ≤ 30°.

3. The cylinder liner sealing structure according to claim 1, characterized in that, The body (2) also has a tapered side wall (23) connected above the first inner side wall (21). The distance between the tapered side wall (23) and the first outer side wall (11) gradually decreases from top to bottom. The height of the tapered side wall (23) along the vertical direction is L1, 1.5 mm ≤ L1 ≤ 2 mm.

4. The cylinder liner sealing structure according to claim 1, characterized in that, The height of the fitting part between the first inner wall (21) and the first outer wall (11) is L2, where 2.5 mm ≤ L2 ≤ 3.5 mm.

5. The cylinder liner sealing structure according to claim 1, characterized in that, The groove width of the sealing ring groove (13) is L3, and the depth of the sealing ring groove (13) is W1, where 3 mm ≤ L3 ≤ 4.5 mm; 1 mm ≤ W1 ≤ 1.8 mm.

6. An engine, characterized in that, It includes the cylinder liner sealing structure according to any one of claims 1-5.

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