Cylinder cover cooling water jacket and cooling control method

Abstract

The invention relates to the technical field of engine cooling, in particular to a cylinder cover cooling water jacket and a cooling control method. The cooling water jacket comprises a lower water jacket, an upper water jacket and a main water jacket; the lower water jacket and the upper water jacket are communicated through an exhaust upper water opening and a middle upper water opening; the upper water jacket is provided with a partition plate, the partition plate partitions one side of the upper water jacket and divides the upper water jacket into an air inlet partition and an air outlet partition, the air outlet upper water opening is located in the range of the air outlet partition, and the middle upper water opening is located between the air outlet partition and the air inlet partition. The main water jacket is located on the side face of the upper water jacket, cooling liquid of the exhaust subarea enters the main water jacket through a water inlet, and the cooling liquid of the air inlet subarea can be converged into the water inlet through a bypass hole formed in the partition plate. Partitioned cooling of the air inlet channel area and the exhaust channel area of the cylinder cover is achieved through the cooling water jacket, the cooling strategy is flexibly adjusted according to different application requirements, and therefore heat management and performance of an engine are optimized.

Description

Technical Field

[0001] The invention relates to the technical field of engine cooling, and in particular to a cylinder head cooling water jacket and a cooling control method. Background Art

[0002] In a car engine, the cylinder head is one of the key components. It not only supports the valve train, but is also responsible for sealing the combustion chamber. The cooling of the cylinder head is crucial to the performance and reliability of the engine. The key is the design of the cylinder head cooling water jacket, which controls the temperature of the cylinder head through the flow of coolant in the cooling water jacket to optimize the thermal efficiency and performance of the engine.

[0003] The upper water jacket in the existing single cylinder head cooling water jacket usually adopts an integral structure, which is divided into two layers: the upper water jacket and the lower water jacket. The upper water jacket only serves as a channel for the coolant and is not precisely controlled, so it is impossible to achieve zoned cooling of the intake and exhaust duct areas. This design cannot meet the cooling requirements of different application scenarios, such as in heavy-duty natural gas vehicle applications with high power density and high exhaust temperature.

[0004] Therefore, the shortcomings of the existing technology are: it is impossible to achieve accurate cooling of the intake and exhaust duct areas, resulting in low engine thermal management efficiency. In different application scenarios, the cooling requirements cannot be flexibly adjusted, which limits the optimization of engine performance. The water jacket with an integral structure cannot meet special cooling requirements, such as methanol, gasoline engine air injection models and high thermal efficiency diesel engines. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of an embodiment of the present invention is to provide a cylinder head cooling water jacket and a cooling control method. By setting different water inlets, baffles and bypass ports, the flow of cooling water can be accurately controlled to achieve zoned cooling of the cylinder head intake and exhaust areas. The cooling strategy can be flexibly adjusted according to different application requirements, thereby optimizing the thermal management and performance of the engine.

[0006] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A cylinder head cooling water jacket comprises a lower water jacket, an upper water jacket and a main water jacket; the lower water jacket and the upper water jacket are connected through an exhaust upper water inlet and an intermediate upper water inlet; the upper water jacket is provided with a partition, the partition separates one side of the upper water jacket and divides the upper water jacket into an intake partition and an exhaust partition, the exhaust upper water inlet is located within the exhaust partition range, and the intermediate upper water inlet is located between the exhaust partition and the intake partition; the main water jacket is located on the side of the upper water jacket, the coolant of the exhaust partition enters the main water jacket through the water inlet, and the coolant of the intake partition can be collected into the water inlet through a bypass hole provided in the partition.

[0008] Optionally, the lower water jacket is located at the lower side of the upper water jacket, and a water inlet is provided on the lower side of the lower water jacket. The water inlet is distributed on the outer peripheral side of the lower water jacket, and the exhaust upper water inlet and the middle upper water inlet are located in the middle position of the lower water jacket.

[0009] Optionally, the cylinder head has an intake duct and an exhaust duct, the intake partition of the upper water jacket is located around the intake duct for cooling the intake duct, and the exhaust partition of the upper water jacket is located around the exhaust duct for cooling the exhaust duct.

[0010] Optionally, the partition is located between the intake partition and the exhaust partition, and is used to adjust the flow of coolant entering the intake partition.

[0011] Optionally, the exhaust partition covers a first exhaust duct and a second exhaust duct, the first exhaust duct is an exhaust duct close to the exhaust duct outlet, the second exhaust duct is an exhaust duct away from the exhaust duct outlet, and the exhaust water inlet is located between the first exhaust duct and the second exhaust duct.

[0012] Optionally, the water inlet of the main water jacket includes a first water inlet and a second water inlet, wherein the first water inlet is a water inlet close to the air intake partition, and the second water inlet is a water inlet far from the air intake partition.

[0013] Optionally, part of the coolant entering through the exhaust upper water inlet enters the main water jacket from the second water inlet through the outer side of the first exhaust duct, and part of the coolant enters the main water jacket from the first water inlet through the inner side of the first exhaust duct.

[0014] Optionally, part of the coolant entering through the middle upper water inlet enters the main water jacket from the first water inlet and the second water inlet through the second exhaust duct and the first exhaust duct of the exhaust partition, and part of it enters the main water jacket from the first water inlet through the intake partition.

[0015] Optionally, the bypass hole passes through the partition and extends to the side of the cylinder head, and a plug is installed on the bypass hole on the side of the cylinder head.

[0016] The embodiment of the present invention further provides a cooling control method for the cylinder head cooling water jacket as described above, comprising:

[0017] By adjusting the diameters of the middle water inlet, the exhaust water inlet and the bypass hole, as well as the opening and closing of the bypass hole, the ratio of the coolant entering the intake partition and the exhaust partition can be controlled;

[0018] The ratio of the coolant flowing through the outside and inside of the first exhaust conduit is controlled by adjusting the diameters of the first water inlet and the second water inlet, as well as the inner cross section of the first exhaust conduit.

[0019] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0020] 1. The upper water jacket in the cooling water jacket is divided into zones by a partition and is connected to the lower water jacket through two upper water inlets, wherein the middle upper water inlet is located between the two zones, the exhaust upper water inlet is located in the exhaust zone, and a bypass hole can be provided on the partition as required. By adjusting the diameters of the middle upper water inlet, the exhaust upper water inlet and the bypass hole, as well as the on-off of the bypass hole, the ratio of coolant entering the intake zone and the exhaust zone is controlled, the upper water jacket of the cylinder head is accurately cooled, the intake and exhaust zone cooling of the cylinder head is realized, and then a blank is realized to meet the requirements of different applications such as optimizing airway thermal management, performance, reliability, airway injection, and intake organization.

[0021] 2. The upper water jacket and the main water jacket are connected through two water inlets, which are matched with the position of the exhaust upper water inlet to optimize the flow path of the coolant and effectively adjust the flow of coolant flowing into both sides of the exhaust duct to meet the cooling needs in different application scenarios. By controlling the flow of the two water inlets, more accurate cooling management can be achieved, improving the overall heat exchange efficiency.

[0022] Advantages of additional aspects of the present invention will be given in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, the spacing or size between each other is exaggerated to show the position of each part, and the schematic diagram is only used for illustration.

[0024] Figure 1 is a top view of a cylinder head provided by an embodiment of the present invention;

[0025] Figure 2 is a side view of a cylinder head provided by an embodiment of the present invention;

[0026] Figure 3 is a cross-sectional view of a cylinder head provided by an embodiment of the present invention;

[0027] Figure 4 is a disassembly diagram of a cooling water jacket provided in an embodiment of the present invention;

[0028] Figure 5 is an overall schematic diagram of a cooling water jacket provided by an embodiment of the present invention;

[0029] Figure 6 is a side view of a cooling water jacket provided by an embodiment of the present invention;

[0030] Figure 7 1 is a top view of a cooling water jacket (without bypass holes) provided in an embodiment of the present invention;

[0031] Figure 8 1 is a top view of a cooling water jacket (with bypass holes) provided in an embodiment of the present invention;

[0032] Fig. 9 is a cross-sectional view of a cooling water jacket (without bypass holes) provided in an embodiment of the present invention;

[0033] Fig.10 is a cross-sectional view of a cooling water jacket (with bypass holes) provided in an embodiment of the present invention;

[0034] Fig.11 is a schematic diagram of a coolant flow path provided by an embodiment of the present invention;

[0035] In the figure: 1, cylinder head; 11, first exhaust duct; 12, second exhaust duct; 13, intake duct; 14, exhaust duct; 2, plugging; 3, lower water jacket; 31, water inlet; 4, upper water jacket; 41, intake partition; 42, exhaust partition; 43, partition; 44, bypass hole; 45, middle upper water inlet; 46, exhaust upper water inlet; 5, main water jacket; 51, first water inlet; 52, second water inlet; DETAILED DESCRIPTION

[0036] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Glossary:

[0038] Monoblock cylinder head: Single cylinder, cylinder head is assembled independently. In contrast, integral cylinder head, cylinder head seals multiple cylinders at the same time.

[0039] Cooling Jacket: A water-cooled cylinder head with passages through which coolant flows, consisting of a combination of cast and machined features.

[0040] Example 1

[0041] In order to solve the above technical problems, this embodiment proposes a cylinder head cooling water jacket, which realizes the zoned cooling of the cylinder head 1 intake and exhaust passages 14 through the innovative water jacket structure design, and introduces a bypass structure to achieve precise control of the flow rate. Such a design is intended to optimize airway thermal management, improve engine performance, enhance reliability, and adapt to different application requirements, such as airway injection, intake organization optimization, etc.

[0042] like Figure 1 , Figure 2 , Figure 3 As shown, an intake passage 13 and an exhaust passage 14 are provided in the cylinder head 1 . A first exhaust conduit 11 is provided near the exhaust passage 14 outlet in the exhaust passage 14 area, and a second exhaust conduit 12 is provided away from the exhaust passage 14 outlet.

[0043] like Figure 4 , Figure 5 , Figure 6 As shown, the cooling water jacket comprises a lower water jacket 3, an upper water jacket 4 and a main water jacket 5. The lower water jacket 3 and the upper water jacket 4 are connected through an exhaust upper water port 46 and an intermediate upper water port 45 (as shown in FIG. Fig. 9 The upper water jacket 4 is provided with a partition 43 (as shown); Figure 7 As shown in FIG. 1 ), the partition 43 separates one side of the upper water jacket 4 and divides the upper water jacket 4 into an intake partition 41 and an exhaust partition 42. It should be noted that the separation here does not completely separate the two partitions, but separates one side of the upper water jacket 4. That is, the original upper water jacket 4 can be seen as a completely connected ring. The upper water jacket 4 is divided into a C shape by the setting of the partition 43. The exhaust water inlet 46 is located within the exhaust partition 42, and the middle water inlet 45 is located between the exhaust partition 42 and the intake partition 41 (as shown in FIG. 1 ). Figure 7 , Fig. 9 The main water jacket 5 is located on the side of the upper water jacket 4, and the coolant of the exhaust partition 42 enters the main water jacket 5 through the water inlet. The coolant of the intake partition 41 can pass through the partition 43 to open the bypass hole 44 (as shown in FIG. Figure 8 , Fig.10 as shown) into the water inlet.

[0044] The cylinder head cooling water jacket of this embodiment includes a lower water jacket 3, an upper water jacket 4 and a main water jacket 5. The lower water jacket 3 is connected to the upper water jacket 4 through an exhaust upper water port 46 and an intermediate upper water port 45. This design allows the coolant to flow smoothly between the lower water jacket 3 and the upper water jacket 4, and facilitates effective thermal management. A partition 43 is provided in the upper water jacket 4 to divide it into an intake partition 41 and an exhaust partition 42. The intake partition 41 of the upper water jacket 4 surrounds the intake duct 13 to effectively cool the intake duct 13 and prevent excessive temperature from affecting the intake performance. At the same time, the exhaust partition 42 surrounds the side of the exhaust duct 14 to ensure that the exhaust duct 14 can also be properly cooled. This layout ensures the partitioned cooling effect of the intake duct 13 and the exhaust duct 14 during operation.

[0045] The partition 43 is located between the intake partition 41 and the exhaust partition 42, and plays a role in regulating the flow of coolant entering the intake partition 41. The partition 43 and the bypass hole 44 opened on the partition 43 allow the flow of coolant between the intake partition 41 and the exhaust partition 42 to be regulated, thereby achieving precise cooling of the partitions. By setting different flow channels, the cooling requirements of the intake partition 41 can be adjusted according to different working conditions. This adjustment mechanism enables the cooling of the intake duct 13 to adapt to the corresponding thermal management requirements under different loads and speeds, ensuring that the engine is always in the best working state.

[0046] The exhaust water inlet 46 is located in the exhaust partition 42, so that part of the coolant can directly enter the exhaust partition 42 without passing through the intake partition 41, thereby achieving the strong cooling demand of the exhaust partition 42 and the exhaust duct; and the middle water inlet 45 is located between the intake partition 41 and the exhaust partition 42, and the amount of coolant flowing into the intake partition 41 can be adjusted according to demand, thereby controlling the cooling effect of the intake partition 41. The main water jacket 5 is located on the side of the upper water jacket 4 to ensure that the coolant flowing through the upper water jacket 4 flows smoothly into the main water jacket 5.

[0047] The lower water jacket 3 is located at the lower side of the upper water jacket 4 . A water inlet 31 is provided at the lower side of the lower water jacket 3 . The water inlet 31 is distributed around the outer edge of the lower water jacket 3 . The exhaust upper water inlet 46 and the middle upper water inlet 45 are located in the middle of the lower water jacket 3 .

[0048] like Figure 4 As shown, the lower water jacket 3 is located at the lower side of the upper water jacket 4, and there are four water inlets 31, which are arranged at the lower side of the lower water jacket 3 and distributed on the outer peripheral side of the lower water jacket 3. Such a design can optimize the inflow path of the coolant and ensure that the coolant is evenly distributed to the entire lower water jacket 3. The exhaust upper water inlet 46 and the middle upper water inlet 45 are located in the middle of the lower water jacket 3, allowing the coolant to fully flow and exchange in the lower water jacket 3 to achieve the best heat exchange effect.

[0049] The exhaust partition 42 covers the first exhaust duct 11 and the second exhaust duct 12. Since the cooling requirement of the second exhaust duct 12 is lower than that of the first exhaust duct 11, the exhaust water inlet 46 is located between the first exhaust duct 11 and the second exhaust duct 12. The coolant entering through the exhaust water inlet 46 does not pass through the second exhaust duct 12, but directly cools the first exhaust duct 11 near the exhaust passage 14, thereby achieving the purpose of strengthening the cooling of the first exhaust duct 11.

[0050] The water inlet of the main water jacket 5 includes a first water inlet 51 and a second water inlet 52, wherein the first water inlet 51 is a water inlet close to the air intake partition 41, and the second water inlet 52 is a water inlet far from the air intake partition 41. The two water inlets are arranged in conjunction with the position of the exhaust upper water inlet 46 to optimize the flow path of the coolant and effectively adjust the flow of the coolant flowing into both sides of the exhaust duct to meet the cooling requirements in different application scenarios. By controlling the flow of the two water inlets, more accurate cooling management can be achieved, and the overall heat exchange efficiency is improved.

[0051] like Fig.10 , Fig.11 As shown, part of the coolant entering through the exhaust upper water inlet 46 enters the main water jacket 5 from the second water inlet 52 through the outside of the first exhaust duct 11, and part of it enters the main water jacket 5 from the first water inlet 51 through the inside of the first exhaust duct 11. This split flow design ensures that the coolant can flexibly flow into the main water jacket 5, and can adjust the flow rate accordingly according to the actual temperature requirements on both sides of the first exhaust duct 11, thereby improving the thermal management performance of the entire system.

[0052] The coolant entering through the middle water inlet 45 enters the main water jacket 5 from the first water inlet 51 and the second water inlet 52 through the second exhaust duct 12 and the first exhaust duct 11 of the exhaust partition 42, and enters the main water jacket 5 from the bypass hole 44 and the first water inlet 51 through the intake partition 41. This design allows the coolant to be flexibly distributed between the intake partition 41 and the exhaust partition 42 to meet different cooling needs, and further improves the efficiency of heat exchange through the reasonable distribution of the coolant. Generally, the intake distribution is 10%-15%; in special application scenarios or extreme cases, the bypass hole 44 is not processed, the exhaust side flow is 100%, and the intake side is 0%.

[0053] For the convenience of processing, the bypass hole 44 passes through the partition and extends to the side of the cylinder head 1, and a plug 2 is installed on the bypass hole 44 on the side of the cylinder head 1 to prevent the coolant from leaking out.

[0054] The cooling water jacket realizes the partition cooling of the intake duct 13 and the exhaust duct 14, and improves the thermal management efficiency of the engine. By accurately controlling the flow distribution of cooling water, the cooling requirements in different application scenarios are met. By adjusting the diameter of the bypass hole 44, the cooling requirements can be flexibly adjusted, and the engine performance is optimized.

[0055] The practical significance of controlling the cooling of the air inlet duct 13 and the exhaust duct 14 of the upper water jacket 4:

[0056] 1. Optimize the balance design of exhaust duct 14 thermal management and exhaust temperature to accurately control air duct heat exchange.

[0057] 2. Reduce the heat exchange of the intake duct 13, increase the intake volume and power; - The intake temperature should be as low as possible while ensuring other requirements.

[0058] 3. Improve the heat transfer of the intake duct 13 and solve the problem of fuel wall atomization in the duct injection model; - duct injection models of methanol and gasoline engines.

[0059] 4. Improve the heat exchange of the exhaust duct 14, strengthen the cooling of the exhaust valve duct, and reduce the exhaust temperature; - heavy-duty natural gas models with high power density and high exhaust temperature.

[0060] 5. Reduce the heat exchange of the exhaust duct 14, reduce the exhaust heat exchange loss, and improve the post-processing efficiency. ——High thermal efficiency diesel engines need to reduce the heat exchange of the air duct.

[0061] Example 2

[0062] This embodiment provides a cooling control method for a cylinder head cooling water jacket as described in Embodiment 1, comprising:

[0063] By adjusting the diameters of the middle water inlet 45, the exhaust water inlet 46 and the bypass hole 44, and the opening and closing of the bypass hole 44, the ratio of the coolant entering the intake partition 41 and the exhaust partition 42 is controlled;

[0064] By adjusting the diameters of the first water inlet and the second water inlet, and the inner cross-section of the first exhaust duct 11 , the ratio of the coolant flowing through the outer side and the inner side of the first exhaust duct 11 is controlled.

[0065] The cooling demand on the outside of the first exhaust duct 11 is higher than that on the inside. The cooling distribution between the inside and outside of the first exhaust duct 11 is achieved by controlling the cross-sectional areas of the first water inlet and the second water inlet of the main water jacket 5 and reducing the cross-sectional area of ​​the inside of the first exhaust duct 11, so as to achieve the purpose of allowing more flow to pass through the outside.

[0066] In order to make the technical solution provided by this embodiment clearer, the following description is given using the same blank to process different cylinder heads 1:

[0067] The application of the present invention is described by taking a methanol engine as an example:

[0068] (1) Intake duct 13: The methanol engine uses liquid injection in the intake duct 13. Methanol needs to be atomized in the intake duct 13. The temperature of the methanol wall in the intake duct 13 is lower than the temperature of the coolant. It is necessary to increase the coolant to heat the wall. By processing a larger bypass hole 44, the flow rate ratio on the intake side can be increased.

[0069] (2) Exhaust duct 14: The exhaust duct of the methanol engine needs to be cooled more effectively. The exhaust duct 14 also needs to be cooled more effectively due to its high exhaust temperature. By allowing part of the water to cool the first exhaust duct 11 directly without passing through the second exhaust duct 12, and increasing the flow rate outside the first exhaust duct 11, the purpose of strengthening the cooling of a specific area can be achieved.

[0070] (3) Thermal management: When the engine needs to continue to improve efficiency and reduce the heat carried away by the water jacket, this can be achieved by appropriately increasing the diameter of the bypass hole 44.

[0071] The application of the present invention is described by taking a natural gas engine as an example:

[0072] (1) Intake duct 13: The intake duct 13 of a natural gas engine is a homogeneous mixed gas. It is necessary to reduce the temperature in the intake duct 13 and increase the intake density to prevent the coolant from heating the wall surface. The bypass hole 44 is processed with a smaller aperture or even not processed to reduce the flow rate ratio on the intake side.

[0073] (2) Exhaust duct 14: The exhaust duct of the methanol engine needs to be cooled more effectively. The exhaust duct 14 also needs to be cooled more effectively due to its high exhaust temperature. By allowing part of the water to cool the first exhaust duct 11 directly without passing through the second exhaust duct 12, and increasing the flow rate outside the first exhaust duct 11, the purpose of strengthening the cooling of a specific area can be achieved.

[0074] (3) Thermal management: When the engine needs to continue to improve efficiency and reduce the heat carried away by the water jacket, it is necessary to appropriately increase the diameter of the bypass hole 44. Different from the trend in item (1), it is necessary to further optimize the diameter of the bypass hole 44 by comprehensively considering exhaust temperature, thermal management, and intake air cooling during the performance development stage.

[0075] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it 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 on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A cylinder head cooling water jacket, characterized in that: Including lower water jacket, upper water jacket and main water jacket; The lower water jacket and the upper water jacket are connected through the exhaust upper water inlet and the middle upper water inlet; The upper water jacket is provided with a partition, which partitions one side of the upper water jacket and divides the upper water jacket into an air intake partition and an exhaust partition, the exhaust upper water inlet is located within the exhaust partition, and the middle upper water inlet is located between the exhaust partition and the air intake partition; The main water jacket is located on the side of the upper water jacket, and the coolant of the exhaust partition enters the main water jacket through the water inlet, and the coolant of the intake partition can flow into the water inlet through the bypass hole opened in the partition.

2. The cylinder head cooling water jacket according to claim 1, characterized in that: The lower water jacket is located at the lower side of the upper water jacket, and a water inlet is arranged at the lower side of the lower water jacket. The water inlet is distributed around the outer edge of the lower water jacket, and the exhaust upper water inlet and the middle upper water inlet are located in the middle of the lower water jacket.

3. The cylinder head cooling water jacket according to claim 1, characterized in that: The cylinder head has an intake passage and an exhaust passage. The intake partition of the upper water jacket is located around the intake passage for cooling the intake passage. The exhaust partition of the upper water jacket is located around the exhaust passage for cooling the exhaust passage.

4. The cylinder head cooling water jacket according to claim 1, characterized in that: The partition is located between the intake partition and the exhaust partition, and is used to adjust the flow of coolant entering the intake partition.

5. The cylinder head cooling water jacket according to claim 1, characterized in that: The exhaust partition covers a first exhaust duct and a second exhaust duct, the first exhaust duct is an exhaust duct close to the exhaust duct outlet, the second exhaust duct is an exhaust duct far from the exhaust duct outlet, and the exhaust water inlet is located between the first exhaust duct and the second exhaust duct.

6. The cylinder head cooling water jacket according to claim 1, characterized in that: The water inlet of the main water jacket includes a first water inlet and a second water inlet, wherein the first water inlet is a water inlet close to the air intake partition, and the second water inlet is a water inlet far from the air intake partition.

7. The cylinder head cooling water jacket according to claim 6, characterized in that: The coolant entering through the exhaust water inlet partially enters the main water jacket from the second water inlet through the outside of the first exhaust duct, and partially enters the main water jacket from the first water inlet through the inside of the first exhaust duct.

8. The cylinder head cooling water jacket according to claim 6, characterized in that: The coolant entering through the middle upper water inlet partially enters the main water jacket from the first water inlet and the second water inlet through the second exhaust duct and the first exhaust duct of the exhaust partition, and partially enters the main water jacket from the first water inlet through the intake partition.

9. The cylinder head cooling water jacket according to claim 1, characterized in that: The bypass hole passes through the partition and extends to the side of the cylinder head, and a plug is installed on the bypass hole on the side of the cylinder head.

10. A cooling control method for a cylinder head cooling water jacket according to any one of claims 1 to 9, characterized in that: include: By adjusting the diameters of the middle water inlet, the exhaust water inlet and the bypass hole, as well as the opening and closing of the bypass hole, the ratio of the coolant entering the intake partition and the exhaust partition is controlled; The ratio of the coolant flowing through the outer side and the inner side of the first exhaust conduit is controlled by adjusting the diameters of the first water inlet and the second water inlet, as well as the inner cross section of the first exhaust conduit.

Images