Design method and processing method for cylinder liner flame barrier, cylinder liner and internal combustion engine

Abstract

The present application relates to a cylinder liner flame baffle design method, processing method, cylinder liner and internal combustion engine, comprising the following steps: thermal engine simulation is carried out on the combustion chamber model; the minimum design gap between the outer edge of the flame baffle and the cylinder head is obtained according to the set target gap lower limit value, the set experience gap and the maximum simulation gap of the outer edge of the flame baffle obtained by thermal engine simulation; the maximum design gap between the outer edge of the flame baffle and the cylinder head is obtained according to the set target gap lower limit value, the set experience gap and the minimum simulation gap of the outer edge of the flame baffle obtained by thermal engine simulation; the inclination angle of the upper surface of the flame baffle is obtained according to the simulation maximum gap of the outer edge and the inner edge of the flame baffle obtained by thermal engine simulation, and the maximum design gap and the minimum design gap of the inner edge of the flame baffle are obtained according to the inclination angle, the maximum design gap and the minimum design gap of the outer edge of the flame baffle; the method of the present application can ensure that the gap between the flame baffle and the cylinder head is uniformly distributed.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine technology, specifically to the design and processing methods of cylinder liner flame deflectors, as well as cylinder liners and internal combustion engines. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] The combustion chamber of an existing internal combustion engine consists of components such as the cylinder block, cylinder liner, cylinder head, and piston. The cylinder liner has a flame deflector, the main function of which is to reduce the pulse impact of high-temperature and high-pressure combustion gas on the gasket and the temperature rise of the gasket. At the same time, the filling part of the flame deflector can also reduce the harmful volume of the combustion chamber.

[0004] When designing the flame deflector of a cylinder liner, the clearance between the flame deflector and the cylinder head is a crucial design consideration. Currently, the clearance between all points on the upper surface of the flame deflector and the cylinder is set to the same value, meaning the upper surface of the flame deflector is flat. Cylinder liners manufactured using this design method have the following defects:

[0005] Under high-temperature (temperature rise) conditions, the cylinder head deforms, and the engine explodes (combustion pressure reaches over 25 MPa). The internal combustion pressure also causes cylinder head deformation. These conditions lead to uneven clearance between the flame deflector and the cylinder head. With increasing engine strength, the number and grade of cylinder head bolts have decreased, increasing cylinder head thermal load and combustion pressure. This results in more uneven cylinder head assembly deformation and engine deformation. These performance improvements further exacerbate the uneven distribution of the flame deflector clearance, causing the clearance between the upper surface of the flame deflector and the cylinder head to fail to meet requirements. Current technology, to solve these problems, only considers the minimum clearance design after deformation. To ensure no mechanical contact between the cylinder head and the flame deflector, the design clearance between the flat flame deflector and the cylinder head is further increased. However, even after cylinder head deformation, some areas still have excessively large distances between the flame deflector and the cylinder head, reducing flame deflection function and increasing harmful volume. This leads to high-temperature creep of the gasket, causing seal failure. Gaskets with larger clearances deform and leak under the impact of high-pressure, high-temperature combustion gases. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a design method for the cylinder liner flame deflector, which solves the problem of uneven gap between the flame deflector and the cylinder head, while improving the flame deflector efficiency and ensuring the reliability of the sealing gasket.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, embodiments of the present invention provide a method for designing a cylinder liner flame deflector, comprising the following steps:

[0009] A thermodynamic simulation is performed on the combustion chamber model to obtain a first gap, a second gap, and a third gap. The first gap is the maximum simulated gap between the outer edge of the flame deflector and the cylinder head; the second gap is the minimum simulated gap between the outer edge of the flame deflector and the cylinder head; and the third gap is the maximum simulated gap between the inner edge of the flame deflector and the cylinder head.

[0010] The minimum design clearance between the outer edge of the flame deflector and the cylinder head is obtained based on the set target clearance lower limit between the outer edge of the flame deflector and the cylinder head, the set empirical clearance between the outer edge of the flame deflector and the cylinder head, and the first clearance.

[0011] The maximum design clearance between the outer edge of the flame deflector and the cylinder head is obtained based on the target clearance lower limit, the empirical clearance, and the second clearance.

[0012] The tilt angle of the upper surface of the flame deflector is obtained based on the first gap and the third gap.

[0013] The maximum design gap between the inner edge of the flame deflector and the cylinder head is obtained based on the tilt angle and the maximum design gap between the outer edge of the flame deflector and the cylinder head. The minimum design gap between the inner edge of the flame deflector and the cylinder head is obtained based on the tilt angle and the minimum design gap between the outer edge of the flame deflector and the cylinder head.

[0014] Optionally, the difference between the empirical gap and the first gap is used to obtain the first cylinder head deformation at the first position, where the first position is the position where there is a first gap between the outer edge of the flame deflector and the cylinder head. The minimum design gap between the outer edge of the flame deflector and the cylinder head at the first position is obtained by using the first cylinder head deformation and the lower limit of the target gap.

[0015] Optionally, the difference between the empirical clearance and the second clearance is used to obtain the second cylinder head deformation at the second position, where the second position is the position where there is a second clearance between the outer edge of the flame deflector and the cylinder head. The maximum design clearance between the outer edge of the flame deflector and the cylinder head at the second position is obtained by using the second cylinder head deformation and the target clearance lower limit.

[0016] Optionally, obtaining the tilt angle of the upper surface of the flame deflector based on the first gap and the third gap includes: obtaining the tilt angle of the upper surface of the flame deflector based on the first gap, the third gap, and the difference between the outer diameter and the inner diameter of the flame deflector.

[0017] Optionally, the lower limit of the target clearance between the outer edge of the flame deflector and the cylinder head is in the range of 0.15mm-0.25mm.

[0018] Optionally, the empirical clearance between the outer edge of the flame deflector and the cylinder head is in the range of 0.3mm-0.5mm.

[0019] Secondly, embodiments of the present invention provide a method for machining a cylinder liner flame deflector, comprising the following steps:

[0020] The flame deflector of the cylinder liner is designed using the method described in the first aspect.

[0021] The machining trajectory of the tool is determined based on the structure of the flame deflector, wherein the angle of the cutting edge of the tool is the same as the inclination angle of the upper surface of the flame deflector.

[0022] The machining path of the cutting tool includes an outer circular arc path and an inner circular arc path. The position of the maximum design gap between the outer edge of the flame deflector and the cylinder head and the position of the maximum design gap between the inner edge of the flame deflector and the cylinder head correspond to the outer circular arc path. The position of the minimum design gap between the outer edge of the flame deflector and the cylinder head and the position of the minimum design gap between the inner edge of the flame deflector and the cylinder head correspond to the inner circular arc path. The outer circular arc path and the inner circular arc path are connected by a transition path. Both the outer circular arc path and the inner circular arc path are located in a plane perpendicular to the axis of the flame deflector.

[0023] The cutting edge of the tool contacts the upper surface of the flame deflector blank, and the tool moves along a predetermined machining trajectory to machine the flame deflector blank.

[0024] Optionally, the transition trajectory adopts an arc-shaped trajectory tangent to the outer arc trajectory, with its center located on the line connecting the cylinder bolt and the cylinder center. The radius of the transition trajectory is determined according to the cylinder radius and the number of bolts.

[0025] Thirdly, embodiments of the present invention provide a cylinder liner having a flame deflector manufactured by the machining method described in the second aspect.

[0026] Fourthly, embodiments of the present invention provide an internal combustion engine provided with the cylinder liner described in the third aspect;

[0027] The positions corresponding to the maximum and minimum design gaps between the outer edge of the flame deflector and the cylinder head are equally spaced and alternately distributed; the positions corresponding to the maximum and minimum design gaps between the inner edge of the flame deflector and the cylinder head are equally spaced and alternately distributed.

[0028] The gap between the outer edge of the flame deflector and the cylinder head, where the lines connecting the two diagonally opposite bolts intersect, is the maximum design gap between the outer edge of the flame deflector and the cylinder head. The gap between the inner edge of the flame deflector and the cylinder head, where the lines connecting the two diagonally opposite bolts intersect, is the maximum design gap between the inner edge of the flame deflector and the cylinder head.

[0029] The beneficial effects of this invention are:

[0030] The cylinder liner flame deflector design method of the present invention first performs thermodynamic simulation, then determines the maximum and minimum simulated gaps between the flame deflector and the cylinder head based on the simulation results, and then determines the maximum and minimum design gaps based on the maximum and minimum simulated gaps. This ensures that even if the cylinder head deforms during operation, the gap between the cylinder head and all parts of the upper surface of the flame deflector remains within the design range. Compared with the prior art, it does not require increasing the gap between the entire upper surface of the flame deflector and the cylinder head, and there are no parts that do not meet the gap requirements after deformation. While solving the problem of uneven flame deflector gap, it can ensure the flame deflector effect, improve the reliability of the gasket seal, and meet the problems of uneven circumferential deformation caused by cylinder head gasket displacement, increased bolt axial force, and reduced bolt number. This improves the reliability of the cylinder head gasket and further improves the reliability of the cylinder liner. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0032] Figure 1 This is a flowchart of the design method for Embodiment 1 of the present invention;

[0033] Figure 2 This is a schematic diagram of the combustion chamber model established in Embodiment 1 of the present invention;

[0034] Figure 3 This is a schematic diagram of the combustion chamber model heat engine simulation in Embodiment 1 of the present invention;

[0035] Figure 4 This is a schematic diagram of the tool processing state in Embodiment 2 of the present invention;

[0036] Figure 5 This is a schematic diagram of the contact between the cutting tool and the cylinder liner flame deflector blank in Embodiment 2 of the present invention;

[0037] Figure 6 This is a schematic diagram of the tool machining trajectory in Embodiment 2 of the present invention. Figure 1 ;

[0038] Figure 7 This is a schematic diagram of the tool machining trajectory in Embodiment 2 of the present invention. Figure 2 ;

[0039] Figure 8 This is a schematic diagram of the cylinder liner structure in Embodiment 3 of the present invention. Figure 1 ;

[0040] Figure 9 For the present invention Figure 8 Top view;

[0041] Figure 10 This is a schematic diagram of the cylinder liner structure in Embodiment 3 of the present invention. Figure 2 ;

[0042] Figure 11 For the present invention Figure 10 Top view;

[0043] Figure 12 This is a top view of the combustion chamber of the diesel engine in Embodiment 4 of the present invention;

[0044] Figure 13 For the present invention Figure 12 A schematic diagram of the section along direction A;

[0045] Figure 14 For the present invention Figure 13 Enlarged diagram of point A in the diagram;

[0046] Figure 15 For the present invention Figure 12 Schematic diagram of section B in the middle;

[0047] Figure 16 For the present invention Figure 15 Enlarged diagram of point B in the image;

[0048] The components are: 1. Cylinder block, 2. Cylinder head, 3. Injector, 4. Piston, 5. Cylinder liner, 6. Flame deflector, 7. Bolt, and 8. Gasket. Detailed Implementation

[0049] Example 1

[0050] like Figure 1 As shown, this embodiment provides a cylinder liner flame deflector design method including the following steps:

[0051] Step 1: As Figure 2 As shown, a combustion chamber model is established. This combustion chamber model can be set according to the existing combustion chamber structure, including components such as the cylinder block 1, cylinder head 2, fuel injector 3, piston 4, cylinder liner 5, flame deflector 6, bolts 7, and sealing gasket 8. Figure 3 As shown, a thermodynamic simulation is performed on the established combustion chamber model.

[0052] The model establishment and simulation methods described above can be implemented using existing methods and steps, and will not be described in detail here.

[0053] Step 2: Based on the simulation results, obtain the first gap HD. max仿真 The first gap is the maximum simulated gap between the outer edge of the flame deflector and the cylinder head, and the second gap HD is obtained. min仿真The second gap is the minimum simulated gap between the outer edge of the flame deflector and the cylinder head. The position corresponding to the maximum simulated gap between the outer edge of the flame deflector and the cylinder head, i.e. the first gap, is the first position. The position corresponding to the minimum simulated gap between the outer edge of the flame deflector and the cylinder head, i.e. the second gap, is the second position.

[0054] Based on the simulation results, the third gap HI is obtained. max仿真 The third gap is the maximum simulated gap between the inner edge of the flame deflector and the cylinder head. Based on the simulation results, the fourth gap HI is obtained. min仿真 The fourth gap is the minimum simulated gap between the inner edge of the flame deflector and the cylinder head. The maximum simulated gap between the inner edge of the flame deflector and the cylinder head, i.e., the third gap, corresponds to the third position, and the minimum simulated gap between the inner edge of the flame deflector and the cylinder head, i.e., the fourth gap, corresponds to the fourth position.

[0055] In this embodiment, the second and fourth positions are located on the line connecting the bolts arranged diagonally on the cylinder, and multiple first and second positions are equally spaced along the outer edge of the flame deflector, while multiple third and fourth positions are equally spaced along the inner edge of the flame deflector.

[0056] In this embodiment, the diagonally arranged bolts refer to two bolts whose connecting line passes through the center of the cylinder block. Therefore, there are multiple second positions, fourth positions, first positions, and third positions. Since the minimum simulated gap difference among the multiple second positions is very small, in this embodiment, the simulated gaps of the multiple second positions are considered equal, and their minimum value is taken. Correspondingly, the minimum simulated gap between the inner edge of the flame deflector and the cylinder head is taken as the minimum value of the gaps obtained from the simulation of multiple fourth positions. Similarly, the maximum simulated gap between the outer edge of the flame deflector and the cylinder head is taken as the maximum value of the gaps obtained from the simulation of multiple first positions, and the maximum simulated gap between the inner edge of the flame deflector and the cylinder head is taken as the maximum value of the gaps obtained from the simulation of multiple third positions.

[0057] Step 3: Pre-set the target lower limit value H of the clearance between the outer edge of the flame deflector and the cylinder head. 下限 The empirical clearance H between the outer edge of the flame deflector and the cylinder head 经验 The target gap lower limit value H is set therein. 下限 The value range is 0.15mm-0.25mm, and in this embodiment, the value is 0.2mm. The set empirical gap H 经验 The value ranges from 3mm to 5mm, and in this embodiment, the value is 4mm.

[0058] Based on the set target gap lower limit value H 下限 The set experience gap H 经验 Combined with the first gap HD max仿真 The minimum design clearance HD between the outer edge of the flame deflector and the cylinder head is obtained. min设计The minimum design clearance between the outer edge of the flame deflector and the cylinder head corresponds to the first position of the outer edge of the flame deflector.

[0059] Specifically, the difference between the set empirical gap and the first gap is used to obtain the deformation amount of the first cylinder head at the first position. The first position is the position where there is a first gap between the flame deflector and the cylinder head during simulation. The minimum design gap value between the outer edge of the flame deflector and the cylinder head is obtained by the deformation amount of the first cylinder head and the lower limit of the target gap. The minimum design gap is the gap between the outer edge of the flame deflector and the cylinder head at the first position.

[0060] HD min设计 =H 下限 +(H 经验 -HD max仿真 )

[0061] Based on the target clearance lower limit and the set empirical clearance, we obtain:

[0062] HD min设计 =0.2+(0.4-HD) max仿真 )

[0063] Based on the set target gap lower limit value H 下限 The set experience gap H 经验 Combined with the second gap HD min仿真 The maximum design clearance HD between the outer edge of the flame deflector and the cylinder head is obtained. max设计 The position corresponding to the maximum design gap is the second position on the outer edge of the flame deflector.

[0064] The difference between the set empirical gap and the second gap is used to obtain the deformation amount of the second cylinder head at the second position. The second position refers to the position where there is a second gap between the outer edge of the flame deflector and the cylinder head during simulation. The maximum design gap value between the outer edge of the flame deflector and the cylinder head is obtained by the deformation amount of the second cylinder head and the lower limit of the target gap. The maximum design gap is the gap between the outer edge of the flame deflector and the cylinder head at the second position.

[0065] Concrete, HD max设计 =H 下限 +(H 经验 -HD min仿真 )

[0066] This leads to HD max设计 =0.2+(0.4-HD) min仿真 )

[0067] The outer edge of the flame deflector transitions smoothly between the first and second positions, such that the gap between the portion of the flame deflector between the first and second positions and the cylinder head is between the minimum and maximum design gaps.

[0068] Step 4: Obtain the tilt angle of the upper surface of the flame deflector, such as... Figure 1 As shown, after the flame deflector is deformed, its inner edge is closer to the cylinder head. Therefore, in this embodiment, the upper surface of the flame deflector is designed to be an inclined surface, and the distance between the inner edge of the end closer to the cylinder center and the cylinder head is greater than the distance between the other end and the cylinder head.

[0069] The tilt angle of the upper surface of the flame deflector is obtained based on the first gap and the third gap. In this embodiment, the tilt angle α of the upper surface of the flame deflector is obtained by combining the first gap and the third gap with the pre-designed difference L between the outer diameter and the inner diameter of the flame deflector ring.

[0070] The specific calculation method is as follows:

[0071] tanα=(HI max仿真 -HD max仿真 ) / L

[0072] In this embodiment, the tilt angle α is in the range of 1°-3° and is calculated according to the above formula.

[0073] Step 5: Based on the tilt angle and the maximum and minimum design gaps of the outer edge of the flame deflector, obtain the maximum and minimum design gaps of the inner edge of the flame deflector.

[0074] In this embodiment, the maximum design gap between the inner edge of the flame deflector and the cylinder head is obtained based on the tilt angle and the maximum design gap between the outer edge of the flame deflector and the cylinder head, and the minimum design gap between the inner edge of the flame deflector and the cylinder head is obtained based on the tilt angle and the minimum design gap between the outer edge of the flame deflector and the cylinder head.

[0075] Specifically, HI max设计 =HD max设计 +L*tanα

[0076] HI min设计 =HD min设计 +L*tanα

[0077] Using the design method of this embodiment, after the cylinder head is deformed at the corresponding positions of the first and second positions, the gap between the cylinder head and the outer edge of the flame deflector can be controlled between 0.2mm and 0.3mm. The gap between the inner edge of the flame deflector and the cylinder head at the third and fourth positions can be controlled between 0.2mm and 0.3mm. Since the outer and inner edges of the flame deflector are smoothly transitioned, this is achieved by controlling the trajectory of the cutting tool during machining. Therefore, the gap between other positions on the upper surface of the flame deflector ring and the cylinder head can be controlled between 0.2mm and 0.3mm.

[0078] This design ensures that the gap between the cylinder head and the upper surface of the flame deflector is within the design range. Compared with existing technologies, it eliminates the need to increase the gap between the upper surface of the entire flame deflector and the cylinder head. While solving the problem of uneven flame deflector gap, it can guarantee the flame deflector effect and improve the reliability of the gasket seal. It can also address the problem of uneven circumferential deformation caused by cylinder head gasket displacement, increased bolt axial force, and reduced bolt quantity, thereby improving the reliability of the cylinder head gasket and further enhancing the reliability of the cylinder liner.

[0079] This embodiment mainly focuses on the design of the upper surface of the flame deflector. The design methods for the rest of the flame deflector can be adopted using existing design methods, and will not be described in detail here.

[0080] Example 2:

[0081] This embodiment provides a method for machining a cylinder liner flame deflector, such as... Figures 4-7 As shown, it includes the following steps:

[0082] Step a: Design the flame deflector of the cylinder liner using the method of Example 1.

[0083] Step b: Determine the machining path of the tool based on the structure of the flame deflector. In this embodiment, the machining path of the tool is located on a plane perpendicular to the cylinder liner axis. The machining path of tool 9 includes multiple alternating outer and inner circular arc paths. The centers of both the outer and inner circular arc paths are located at the center of the cylinder. The outer and inner circular arc paths are connected by transition paths. The positions of the maximum design clearance between the inner edge of the flame deflector and the cylinder head, and the positions of the maximum design clearance between the outer edge of the flame deflector and the cylinder head, correspond to the outer circular arc paths. The positions of the minimum design clearance between the inner edge of the flame deflector and the cylinder head, and the positions of the minimum design clearance between the outer edge of the flame deflector and the cylinder head, correspond to the inner circular arc paths. The diameter of the outer circular arc path is... The diameter of the inner circular arc trajectory is in Figure 6 This is a schematic diagram of the machining trajectory when the cylinder head and cylinder block are connected by four bolts. Figure 7 This is a schematic diagram of the machining trajectory when the cylinder head and cylinder block are connected by six bolts.

[0084] The transition trajectory adopts an arc-shaped trajectory tangent to the outer arc trajectory, with its center located on the line connecting the cylinder bolt and the cylinder center. The radius R of the transition trajectory is determined according to the cylinder radius and the number of bolts.

[0085] In this embodiment, the radius difference between the inner and outer circular arc trajectories can be determined based on the maximum and minimum design clearances between the outer edge of the flame deflector and the cylinder head, as well as the tilt angle. Specifically:

[0086] tanα=(HD max设计-HD min设计 ) / (φOD-φID) / 2, where φOD or φID can be manually determined according to the actual situation, due to α, HD max设计 HD min设计 Given this information, we can determine the diameters of the inner and outer circular arc trajectories.

[0087] Specifically, R = cylinder radius / number of bolts / coefficient, with the coefficient ranging from 1 to 3, preferably 1.5 to 2.

[0088] After determining the machining path of the tool, the cutting edge of the tool is brought into contact with the upper surface of the flame deflector of the cylinder liner blank, and the tool and the cylinder liner blank move relative to each other according to the determined machining path.

[0089] In this embodiment, machining can be achieved by rotating the cylinder liner around its own axis and the cutting tool making reciprocating linear motion along the radial direction of the cylinder liner, or by keeping the cylinder liner stationary and the cutting tool moving according to a determined machining trajectory.

[0090] In this embodiment, the upper surface of the flame deflector is processed. The processing methods for other parts of the flame deflector can be adopted using existing methods, and will not be described in detail here.

[0091] Example 3

[0092] This embodiment provides a cylinder liner, such as Figures 8-11 As shown, a flame deflector is provided, manufactured using the method described in Example 2. Other structures of the cylinder liner can use existing structures and will not be described in detail here. Taking a cylinder with six bolts as an example, the structure of the cylinder liner when the cylinder head and cylinder block are connected by six bolts is as follows: Figures 8-9 As shown, when the cylinder head and cylinder block are connected by four bolts, the structure of the cylinder liner is as follows: Figures 10-11 As shown.

[0093] Example 4:

[0094] This embodiment provides an internal combustion engine, such as Figures 12-16 As shown, its combustion chamber is equipped with the cylinder liner described in Embodiment 3. The cylinder liner is installed inside the cylinder block 1. The top of the cylinder block 1 is connected to the cylinder head 2 by bolts 7 and sealing gaskets 8. The bolts 7 are arranged at equal intervals along the circumference. The number of bolts 7 is four or six. Those skilled in the art can set them according to actual needs. The positions corresponding to the maximum and minimum design gaps between the outer edge of the flame deflector and the cylinder head 2 are equally spaced and alternately distributed. The positions corresponding to the maximum and minimum design gaps between the inner edge of the flame deflector and the cylinder head 2 are equally spaced and alternately distributed.

[0095] The maximum design gap between the outer edge of the flame deflector and the cylinder head is the intersection of the lines connecting the two diagonally opposite bolts on the outer edge of the flame deflector and the cylinder head. The maximum design gap between the inner edge of the flame deflector and the cylinder head is the intersection of the lines connecting the two diagonally opposite bolts on the inner edge of the flame deflector and the cylinder head.

[0096] The combustion chamber structure, consisting of components such as cylinder liners, cylinder blocks, gaskets, flame deflectors, bolts, and cylinder heads, can use existing structures and will not be described in detail here. Other structures of the internal combustion engine can also use existing structures and will not be described in detail here.

[0097] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A method of designing a flame stop land of a cylinder liner, characterized by, Includes the following steps: A thermodynamic simulation was performed on the combustion chamber model to obtain a first gap, a second gap, and a third gap; wherein the first gap is the maximum simulated gap between the outer edge of the flame deflector and the cylinder head, the second gap is the minimum simulated gap between the outer edge of the flame deflector and the cylinder head, and the third gap is the maximum simulated gap between the inner edge of the flame deflector and the cylinder head. The minimum design gap between the outer edge of the flame deflector and the cylinder head is obtained based on the set target lower limit value of the gap between the outer edge of the flame deflector and the cylinder head, the set empirical gap between the outer edge of the flame deflector and the cylinder head, and the first gap. The method for obtaining the minimum design clearance is as follows: the difference between the empirical clearance and the first clearance is used to obtain the first cylinder head deformation at the first position. The first position is the position where there is a first clearance between the outer edge of the flame deflector and the cylinder head. The minimum design clearance between the outer edge of the flame deflector and the cylinder head at the first position is obtained by the sum of the first cylinder head deformation and the target clearance lower limit. The maximum design clearance between the outer edge of the flame deflector and the cylinder head is obtained based on the target clearance lower limit, the empirical clearance, and the second clearance. The method for obtaining the maximum design clearance is as follows: the difference between the empirical clearance and the second clearance is used to obtain the deformation amount of the second cylinder head at the second position. The second position is the position where there is a second clearance between the outer edge of the flame deflector and the cylinder head. The maximum design clearance between the outer edge of the flame deflector and the cylinder head at the second position is obtained by summing the deformation amount of the second cylinder head and the lower limit of the target clearance. The tilt angle of the upper surface of the flame deflector is obtained based on the first gap and the third gap; The maximum design clearance between the inner edge of the flame deflector and the cylinder head is obtained based on the tilt angle and the maximum design clearance between the outer edge of the flame deflector and the cylinder head. The minimum design clearance between the inner edge of the flame deflector and the cylinder head is obtained based on the tilt angle and the minimum design clearance between the outer edge of the flame deflector and the cylinder head.

2. The cylinder liner flame deflector design method as described in claim 1, characterized in that, Obtaining the tilt angle of the upper surface of the flame deflector based on the first gap and the third gap includes: obtaining the tilt angle of the upper surface of the flame deflector based on the first gap, the third gap, and the difference between the outer diameter and the inner diameter of the flame deflector.

3. The method of designing a combustion bowl of a cylinder liner according to claim 1, characterized by, The lower limit of the target clearance between the outer edge of the flame deflector and the cylinder head is 0.15mm-0.25mm.

4. The method of designing a combustion bowl of a cylinder liner according to claim 1, characterized by, The empirical clearance between the outer edge of the flame deflector and the cylinder head is in the range of 0.3mm-0.5mm.

5. A method of machining a flame barrier rib of a cylinder liner, characterized by, Includes the following steps: The flame deflector of the cylinder liner is designed using the method described in any one of claims 1-4; The machining trajectory of the tool is determined based on the structure of the flame deflector, wherein the angle of the cutting edge of the tool is the same as the inclination angle of the upper surface of the flame deflector. The machining path of the tool includes an outer circular arc path and an inner circular arc path. The position of the maximum design gap between the outer edge of the flame deflector and the cylinder head and the position of the maximum design gap between the inner edge of the flame deflector and the cylinder head correspond to the outer circular arc path. The position of the minimum design gap between the outer edge of the flame deflector and the cylinder head and the position of the minimum design gap between the inner edge of the flame deflector and the cylinder head correspond to the inner circular arc path. The outer circular arc path and the inner circular arc path are connected by a transition path. Both the outer circular arc path and the inner circular arc path are located in a plane perpendicular to the axis of the flame deflector. The cutting edge of the tool contacts the upper surface of the flame deflector blank, and the tool moves along a predetermined machining trajectory to machine the flame deflector blank.

6. The method of processing a flame dam of a cylinder liner according to claim 5, wherein The transition trajectory adopts an arc-shaped trajectory tangent to the outer arc trajectory, with its center located on the line connecting the cylinder bolt and the cylinder center. The radius of the transition trajectory is determined according to the cylinder radius and the number of bolts.

7. A cylinder liner characterized by comprising: The flame deflector is manufactured using the machining method of the cylinder liner flame deflector as described in claim 5.

8. An internal combustion engine characterized by comprising: The cylinder liner as described in claim 7 is provided; The positions corresponding to the maximum and minimum design gaps between the outer edge of the flame deflector and the cylinder head are equally spaced and alternately distributed; the positions corresponding to the maximum and minimum design gaps between the inner edge of the flame deflector and the cylinder head are equally spaced and alternately distributed. The gap between the outer edge of the flame deflector and the cylinder head, where the lines connecting the two diagonally opposite bolts intersect, is the maximum design gap between the outer edge of the flame deflector and the cylinder head. The gap between the inner edge of the flame deflector and the cylinder head, where the lines connecting the two diagonally opposite bolts intersect, is the maximum design gap between the inner edge of the flame deflector and the cylinder head.

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