Optimized structure of a cylinder head gasket

Abstract

The application discloses an optimized structure of a cylinder head gasket, which is suitable for a V-type engine and comprises a left cylinder head gasket structure and a right cylinder head gasket structure. The left cylinder head gasket structure comprises a plurality of left cylinder hole structures, and the right cylinder head gasket structure comprises a plurality of right cylinder hole structures. Each of the left cylinder hole structures and the right cylinder hole structures comprises an upper water area and a lower water area. The areas of the upper water areas and the lower water areas of the left cylinder hole structures and the right cylinder hole structures gradually increase from front to back. The upper and lower surfaces of the left cylinder head gasket structure and the right cylinder head gasket structure are sprayed with a sealing coating. The optimized structure of the cylinder head gasket is calculated and optimized by CFD analysis. The upper water area of each cylinder is reduced compared with the original scheme. The upper water area of the front-end cylinder is reduced more, and the upper water area of the rear-end cylinder is reduced less. The lower water area of the optimized scheme is reduced for the front-end cylinder, unchanged for the middle-end cylinder and increased for the rear-end cylinder. The areas of the upper water areas and the lower water areas are small in front and large in back, so that more water flows through the rear-end cylinder, thereby improving the poor cooling effect of the cylinder head.

Description

Technical Field

[0001] This invention relates to the field of engine manufacturing, and in particular to an optimized structure for a V-type engine cylinder head gasket. Background Technology

[0002] The function of the cylinder head gasket is to fill the microscopic gaps between the cylinder block and the cylinder head, ensuring good sealing at the mating surfaces, thereby guaranteeing the sealing of the combustion chamber and preventing cylinder leakage and water jacket leakage. The cylinder head gasket, also called a cylinder liner, is located between the cylinder head and the cylinder block. Depending on the material, cylinder head gaskets can be classified into several types, including metal asbestos gaskets, metal composite gaskets, and all-metal gaskets. The following are classifications of cylinder head gaskets:

[0003] 1. Metal asbestos gasket: Metal asbestos gasket is made of asbestos as the base and covered with copper or steel sheet. Another type of metal asbestos gasket is made of perforated steel plate as the skeleton, covered with asbestos and adhesive and pressed together. All metal asbestos gaskets are edged with metal plates around cylinder bores, coolant holes and oil holes.

[0004] 2. Metal composite gasket: The metal composite gasket is made by bonding a new type of heat-resistant, pressure-resistant and corrosion-resistant composite material to both sides of a steel plate, and the cylinder bore, coolant hole and oil hole are edged with stainless steel.

[0005] 3. Metal gaskets: Metal gaskets are high-strength and corrosion-resistant, and are often used in engines requiring high levels of reinforcement. High-quality aluminum plate cylinder liners use rubber rings to seal the coolant holes. Stainless steel laminated cylinder liners also use rubber rings to seal the coolant holes.

[0006] The function of a cylinder head gasket is to achieve a seal between the cylinder block and the cylinder head, preventing leakage of water, oil, and air at the mating surfaces. Simultaneously, the cylinder head gasket possesses good elasticity, thermal conductivity, corrosion resistance, anti-sticking properties, and aging stability. For example... Figure 1 and Figure 2 The YV800 V-type eight-cylinder diesel engine shown has cylinder bores L1 to L4 on the left side and R1 to R4 on the right side. The cylinder head gasket is divided into a left cylinder head gasket and a right cylinder head gasket, which are respectively placed between the cylinder block and the left and right cylinder heads.

[0007] Currently, the cooling water of the YV800 V-type diesel engine cools the cylinder head through the inlet and outlet of the cylinder head gasket. Because the water surface area of ​​each cylinder in the original design is not much different and the water surface area of ​​each cylinder is the same, the water flow rate of the rear cylinder is less and the flow rate is slower, resulting in poor cooling effect.

[0008] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0009] The purpose of this invention is to provide an optimized structure for a cylinder head gasket, which improves the cooling effect of the cylinder head by optimizing the size of the inlet and outlet ports on the cylinder head gasket.

[0010] To achieve the above objectives, the present invention provides an optimized structure for a cylinder head gasket, applicable to V-type engines. The optimized structure includes a left cylinder head gasket structure and a right cylinder head gasket structure. The left cylinder head gasket structure includes multiple left-side cylinder bore structures, and the right cylinder head gasket structure includes multiple right-side cylinder bore structures. Each left-side and right-side cylinder bore structure includes an upper water area and a lower water area. The areas of the upper and lower water areas of the left and right cylinder bore structures gradually increase from front to back. The upper and lower surfaces of the left and right cylinder head gasket structures are coated with a sealing coating.

[0011] In a preferred embodiment, the water inlet area of ​​each left-side cylinder bore structure and each right-side cylinder bore structure includes a main water inlet, and the main water inlet area of ​​each left-side cylinder bore structure and each right-side cylinder bore structure is the same.

[0012] In a preferred embodiment, apart from the foremost left and right cylinder bore structures, the water inlet areas of the remaining left and right cylinder bore structures also include two auxiliary water inlets, and the area of ​​the auxiliary water inlets of the outermost left and right cylinder bore structures is larger than the area of ​​the auxiliary water inlets of the middle left and right cylinder bore structures.

[0013] In a preferred embodiment, the diameter of the main inlet hole of each left-side cylinder bore structure and each right-side cylinder bore structure is [missing information]. The diameters of the auxiliary water inlets of the middle left and right cylinder bore structures are: The diameters of the auxiliary water inlets of the outermost left and right cylinder bore structures are:

[0014] In a preferred embodiment, the angle between the auxiliary water inlet holes of the outermost left and right cylinder bore structures and the line connecting them to the center of the cylinder bore is greater than the angle between the auxiliary water inlet holes of the middle left and right cylinder bore structures and the line connecting them to the center of the cylinder bore.

[0015] In a preferred embodiment, the angle between the auxiliary water inlet holes of the outermost left and right cylinder bore structures and the line connecting them to the center of the cylinder bore is 27°, while the angles between the auxiliary water inlet holes of the middle left and right cylinder bore structures and the line connecting them to the center of the cylinder bore are 18° and 19°, respectively.

[0016] In a preferred embodiment, the water discharge areas of the foremost left and right cylinder bore structures include two circular water outlet holes, while the remaining water discharge areas of the left and right cylinder bore structures include two elongated water outlet holes, and the area of ​​the elongated water outlet holes is larger than the area of ​​the circular water outlet holes.

[0017] In a preferred embodiment, the diameters of the two water outlet holes in the lower water area of ​​the foremost left and right cylinder bore structures are [missing information]. The dimensions of the two elongated outlet holes in the drainage area of ​​the remaining left and right cylinder bore structures are 16-R4.5.

[0018] In a preferred embodiment, the angle between the two water outlet circular holes in the lower water area of ​​the foremost left and right cylinder bore structures and the line connecting them to the center of the cylinder bore is smaller than the angle between the two water outlet elongated holes in the lower water area of ​​the remaining left and right cylinder bore structures and the line connecting them to the center of the cylinder bore.

[0019] In a preferred embodiment, the angles between the two water outlet holes in the lower water area of ​​the foremost left and right cylinder bore structures and the line connecting them to the center of the cylinder bore are 22° and 28°, respectively, while the angles between the two water outlet elongated holes in the lower water area of ​​the remaining left and right cylinder bore structures and the line connecting them to the center of the cylinder bore are 15° and 29°, respectively.

[0020] Compared with the prior art, the optimized structure of the cylinder head gasket of the present invention has the following beneficial effects: the area of ​​the upper and lower water areas of the cylinder head gasket is optimized by CFD analysis calculation. The water area of ​​each cylinder in the optimized scheme is reduced compared with the original scheme, with the front cylinder being reduced more and the rear cylinder less. In the optimized scheme, the lower water area is reduced in the front cylinder, unchanged in the middle cylinder, and increased in the rear cylinder. The area of ​​both the upper and lower water is smaller at the front and larger at the rear, allowing more water to flow through the rear, thereby improving the problem of poor cylinder head cooling effect. Attached Figure Description

[0021] Figure 1 This is a front view schematic diagram of the installation position of a cylinder head gasket according to an embodiment of the present invention;

[0022] Figure 2 This is a top view schematic diagram of the installation position of the cylinder head gasket according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the right cylinder head gasket structure according to an embodiment of the prior art.

[0024] Figure 4 This is a schematic diagram of the right cylinder head gasket structure according to an embodiment of the present invention.

[0025] Figure 5 This is a schematic block diagram of the water surface area of ​​the cylinder gasket according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic block diagram of the water area under the cylinder gasket according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic block diagram of the effective water-contact area of ​​a cylinder gasket according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic block diagram of the effective water-receiving area of ​​a cylinder gasket according to an embodiment of the present invention.

[0029] Explanation of key figure labels:

[0030] L1 - First left cylinder bore structure, L2 - Second left cylinder bore structure, L3 - Third left cylinder bore structure, L4 - Fourth left cylinder bore structure, R1 - First right cylinder bore structure, R2 - Second right cylinder bore structure, R3 - Third right cylinder bore structure, R4 - Fourth right cylinder bore structure. Detailed Implementation

[0031] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0032] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0033] like Figure 4 As shown, an optimized structure for a cylinder head gasket according to a preferred embodiment of the present invention is applicable to a V-type engine. The optimized structure includes a left cylinder head gasket structure and a right cylinder head gasket structure. The left cylinder head gasket structure includes multiple left-side cylinder bore structures, such as, but not limited to, a first left-side cylinder bore structure L1, a second left-side cylinder bore structure L2, a third left-side cylinder bore structure L3, a fourth left-side cylinder bore structure L4, etc. The right cylinder head gasket structure includes multiple right-side cylinder bore structures, such as, but not limited to, a first right-side cylinder bore structure R1, a second right-side cylinder bore structure R2, a third right-side cylinder bore structure R3, a fourth right-side cylinder bore structure R4, etc. Each left-side and right-side cylinder bore structure includes an upper water area and a lower water area, with the areas of the upper and lower water areas gradually increasing from front to back. Simultaneously, the upper and lower surfaces of the left and right cylinder head gasket structures are coated with a sealing coating CMG-PH, with a single-sided coating thickness of (0.005-0.015) mm, which provides excellent sealing performance.

[0034] In some implementations, the water inlet area of ​​each left-side cylinder bore structure and each right-side cylinder bore structure includes a main water inlet, and the main water inlet area of ​​each left-side cylinder bore structure and each right-side cylinder bore structure is the same.

[0035] In some implementations, apart from the foremost left and right cylinder bore structures, the water inlet areas of the remaining left and right cylinder bore structures also include two auxiliary water inlets, and the area of ​​the auxiliary water inlets of the outermost left and right cylinder bore structures is larger than the area of ​​the auxiliary water inlets of the middle left and right cylinder bore structures.

[0036] In some embodiments, the diameter of the main inlet hole of each left-side cylinder bore structure and each right-side cylinder bore structure is [missing information]. The diameters of the auxiliary water inlets of the middle left and right cylinder bore structures are: The diameters of the auxiliary water inlets of the outermost left and right cylinder bore structures are:

[0037] In some implementations, the angle between the auxiliary water inlet holes of the outermost left and right cylinder bore structures and the line connecting them to the center of the cylinder bore is greater than the angle between the auxiliary water inlet holes of the middle left and right cylinder bore structures and the line connecting them to the center of the cylinder bore.

[0038] In some embodiments, the angle between the auxiliary water inlet holes of the outermost left and right cylinder bore structures and the line connecting them to the center of the cylinder bore is 27°, while the angles between the auxiliary water inlet holes of the middle left and right cylinder bore structures and the line connecting them to the center of the cylinder bore are 18° and 19°, respectively.

[0039] Please see Figure 4 In some embodiments, the water discharge areas of the foremost left and right cylinder bore structures include two round water outlet holes, while the water discharge areas of the remaining left and right cylinder bore structures include two elongated water outlet holes, and the area of ​​the elongated water outlet holes is larger than the area of ​​the round water outlet holes.

[0040] In some embodiments, the diameters of the two water outlet holes in the lower water area of ​​the foremost left and right cylinder bore structures are... The dimensions of the two elongated outlet holes in the drainage area of ​​the remaining left and right cylinder bore structures are 16-R4.5.

[0041] In some implementations, the angle between the two water outlet circular holes in the lower water area of ​​the foremost left and right cylinder bore structures and the line connecting them to the center of the cylinder bore is smaller than the angle between the two water outlet elongated holes in the lower water area of ​​the remaining left and right cylinder bore structures and the line connecting them to the center of the cylinder bore.

[0042] In some embodiments, the angles between the two water outlet holes in the lower water area of ​​the foremost left and right cylinder bore structures and the line connecting them to the center of the cylinder bore are 22° and 28°, respectively, while the angles between the two water outlet elongated holes in the lower water area of ​​the remaining left and right cylinder bore structures and the line connecting them to the center of the cylinder bore are 15° and 29°, respectively.

[0043] like Figure 3 As shown, in some embodiments, the optimized structure of a cylinder head gasket in a preferred embodiment of the present invention is derived from an improvement on existing cylinder head gaskets. The original cylinder head gasket structure is as follows: Figure 3 As shown, Figure 3 The illustration depicts the right cylinder head gasket of a prior art YV800 V-type eight-cylinder diesel engine. Its first to fourth right-side cylinder bore structures, R1 to R4, are identical. Each right-side cylinder bore structure has the same water inlet area, including two 16-R4.5 elongated water outlet holes. That is, the two ends of the water outlet holes have a radius of R4.5 mm, the distance between the centers of the two radii is 16 mm, and the angles between the lines connecting the centers of the two radii and the center of the cylinder bore are 15° and 29°, respectively. In the prior art, each right-side cylinder bore structure included a main water inlet inlet located on the extension line of the water inlet end of each right-side cylinder bore structure, with a diameter of... The frontmost right cylinder bore structure R1 also includes two first water inlet holes, located on either side of the main water inlet hole, with diameters of [missing information]. and The angles between the lines connecting the two primary auxiliary water inlets to the cylinder bore centerline and the line connecting the main water inlet to the cylinder bore centerline are 23° and 27°, respectively. However, the diameters of the two primary auxiliary water inlets on the right-side cylinder bore structures R2 and R3 are both... The angles between the lines connecting the two primary water inlets to the cylinder bore centerline and the lines connecting the main water inlet to the cylinder bore centerline remain 23° and 27° respectively. Furthermore, a second secondary water inlet has been added, located between one of the primary water inlets and the main water inlet. The diameter of the second secondary water inlet is... The angle between the line connecting the second auxiliary water inlet to the cylinder bore centerline and the line connecting the main water inlet to the cylinder bore centerline is 18°. The final section of the right-side cylinder bore structure R4 also includes two second auxiliary water inlets, located inside the two first auxiliary water inlets, with a diameter of [missing information]. Furthermore, the angle between the line connecting the two secondary water inlets to the center line of the cylinder bore and the line connecting the main water inlet to the center line of the cylinder bore is 18°.

[0044] Please see Figure 4 In some embodiments, the optimized structure of a cylinder head gasket according to a preferred embodiment of the present invention is... Figure 3Based on the cylinder head gasket structure parameters shown, the water inlet area has been reduced, and the area of ​​the water inlet area of ​​the right cylinder bore structures R1 to R4 gradually increases from front to back. At the same time, the area of ​​the water outlet area of ​​the right cylinder bore structures R1 to R4 has also been improved. The water outlet area of ​​the right cylinder bore structure R1 has been reduced, while the water outlet areas of the middle right cylinder bore structures R2 and R3 remain unchanged, and the water outlet area of ​​the right cylinder bore structure R1 has been increased. Figure 4 (The increase is not shown, but is the same as R2 and R3), and the included angle has also been adjusted accordingly (see [reference]). Figure 4 The effective water inlet and outlet areas of the improved cylinder gasket are compared in Table 1. Figures 5 to 8 As shown in Table 2, the water surface area above the cylinder head gasket is shown in Table 3, the effective water surface area above and below the cylinder head gasket is shown in Table 4, and the effective water surface area below the cylinder head gasket is shown in Table 5.

[0045] Table 1 Comparison of Cylinder Gasket and Effective Inlet / Outlet Water Area

[0046]

[0047] In summary, the optimized structure of the cylinder head gasket of the present invention has the following beneficial effects: Through CFD analysis, the areas of the upper and lower water-cooling regions of the cylinder head gasket are optimized. The optimized scheme reduces the upper water-cooling area of ​​each cylinder compared to the original scheme, with a larger reduction in the front cylinder and a smaller reduction in the rear cylinder. In the optimized scheme, the lower water-cooling area is reduced in the front cylinder, unchanged in the middle cylinder, and increased in the rear cylinder. The area of ​​both the upper and lower water-cooling regions is smaller at the front and larger at the rear, allowing more water to flow through the rear, thereby improving the problem of poor cylinder head cooling. Simultaneously, the upper and lower surfaces of the cylinder head gasket are coated with CMG-PH, providing excellent sealing.

[0048] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. An optimized structure of a cylinder head gasket suitable for a YV800 V-type eight-cylinder diesel engine, characterized by, The optimization structure includes a left cylinder head gasket structure and a right cylinder head gasket structure, the left cylinder head gasket structure includes a plurality of left cylinder bore structures, the right cylinder head gasket structure includes a plurality of right cylinder bore structures, each of the left cylinder bore structure and the right cylinder bore structure includes an upper water area and a lower water area, the area of the upper water area and the lower water area of the left cylinder bore structure and the right cylinder bore structure gradually increases from front to back, and the upper and lower surfaces of the left cylinder head gasket structure and the right cylinder head gasket structure are sprayed with a sealing coating; The upper water area of the left cylinder bore structure and the right cylinder bore structure, except the frontmost left cylinder bore structure and the frontmost right cylinder bore structure, further includes two auxiliary water inlet holes, and the auxiliary water inlet hole of the outermost left cylinder bore structure and the outermost right cylinder bore structure has a larger area than the auxiliary water inlet hole of the intermediate left cylinder bore structure and the intermediate right cylinder bore structure. wherein the diameter of the main water inlet hole of each of the left cylinder bore structure and the right cylinder bore structure is the diameter of the secondary water inlet hole of the intermediate left cylinder bore structure and the intermediate right cylinder bore structure is the diameter of the secondary water inlet hole of the outermost left cylinder bore structure and the outermost right cylinder bore structure is The auxiliary water inlet hole of the outermost left cylinder bore structure and the outermost right cylinder bore structure has an included angle of 27° with the center line of the cylinder bore, and the auxiliary water inlet hole of the intermediate left cylinder bore structure and the intermediate right cylinder bore structure has an included angle of 18° and 19° with the center line of the cylinder bore, respectively. The lower water area of the frontmost left cylinder bore structure and the frontmost right cylinder bore structure includes two water outlet round holes, and the lower water area of the rest of the left cylinder bore structure and the right cylinder bore structure includes two water outlet long holes, and the area of the water outlet long hole is larger than the area of the water outlet round hole. The diameter of the two water outlet round holes of the lower water area of the left cylinder hole structure and the right cylinder hole structure at the front end is 16-R2.5 The size of the two water outlet long holes of the lower water area of the rest of the left cylinder hole structure and the right cylinder hole structure is 16-R4.5; The two water outlet round holes of the lower water area of the frontmost left cylinder bore structure and the frontmost right cylinder bore structure have an included angle of 22° and 28° with the center line of the cylinder bore, respectively, and the two water outlet long holes of the lower water area of the rest of the left cylinder bore structure and the right cylinder bore structure have an included angle of 15° and 29° with the center line of the cylinder bore, respectively. The effective area of the upper water area of the left cylinder bore structure and the right cylinder bore structure is 624㎜ 2 The effective area of the lower water area of the left cylinder bore structure is 1204㎜ 2 The effective area of the lower water area of the right cylinder bore structure is 1333㎜ 2 .

2. The optimized structure of a cylinder head gasket as set forth in claim 1, wherein The upper water area of each of the left cylinder bore structure and the right cylinder bore structure includes a main water inlet hole, and the area of the main water inlet hole of each of the left cylinder bore structure and the right cylinder bore structure is the same.

3. The optimized structure of a cylinder head gasket as set forth in claim 1, wherein The auxiliary water inlet hole of the outermost left cylinder bore structure and the outermost right cylinder bore structure has a larger included angle with the center line of the cylinder bore than the auxiliary water inlet hole of the intermediate left cylinder bore structure and the intermediate right cylinder bore structure.

4. The optimized structure of a cylinder head gasket as set forth in claim 1, wherein The two water outlet round holes of the lower water area of the frontmost left cylinder bore structure and the frontmost right cylinder bore structure have a smaller included angle with the center line of the cylinder bore than the two water outlet long holes of the lower water area of the rest of the left cylinder bore structure and the right cylinder bore structure.

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