A cylinder head cooling jacket and cooling control method

Abstract

The present application relates to the technical field of engine cooling, and particularly relates to a cylinder head cooling water jacket and a cooling control method. The cooling water jacket comprises a lower water jacket, an upper water jacket and a total water jacket; the lower water jacket and the upper water jacket are communicated through an exhaust upper water inlet and an intermediate upper water inlet; the upper water jacket is provided with a partition plate, the partition plate blocks 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 in the exhaust partition, and the intermediate upper water inlet is located between the exhaust partition and the intake partition; the total water jacket is located at the side of the upper water jacket, the cooling liquid of the exhaust partition enters the total water jacket through an inlet water inlet, and the cooling liquid of the intake partition can flow into the inlet water inlet through bypass holes in the partition plate. The cooling water jacket realizes the partition cooling of the cylinder head intake passage area and the exhaust passage area, flexibly adjusts the cooling strategy according to different application requirements, and thus optimizes the thermal management and performance of the engine.

Description

TECHNICAL FIELD

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

[0002] In an automobile engine, the cylinder head is one of the key components, which not only supports the valve train, but also seals the combustion chamber. The cooling of the cylinder head is crucial for the performance and reliability of the engine, and 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 water jacket to optimize the thermal efficiency and performance of the engine.

[0003] The existing single cylinder head cooling water jacket usually adopts a whole structure, which is divided into two layers of upper water jacket and lower water jacket. The upper water jacket only serves as a channel for the coolant and does not perform accurate control, which cannot achieve zoned cooling of the intake and exhaust port areas. This design cannot meet the subcooling requirements in different application scenarios, such as high power density and high exhaust temperature in heavy-duty natural gas vehicle applications.

[0004] Therefore, the existing technology has the following disadvantages: it cannot achieve accurate cooling of the intake and exhaust port areas, resulting in low engine thermal management efficiency. In different application scenarios, the cooling demand cannot be flexibly adjusted, which limits the optimization of engine performance. The whole structure of the water jacket cannot meet the special cooling requirements, such as the port injection type of methanol and gasoline engines and high-thermal-efficiency diesel engines. SUMMARY

[0005] To overcome the deficiencies of the prior art, the purpose of the embodiments of the present application is to provide a cylinder head cooling water jacket and a cooling control method, which precisely control the flow of cooling water by setting different upper water inlets, partitions and bypass ports, achieve zoned cooling of the intake and exhaust port areas of the cylinder head, and flexibly adjust the cooling strategy according to different application requirements, thereby optimizing the thermal management and performance of the engine.

[0006] To achieve the above-mentioned purpose, the embodiments of the present application provide the following technical solutions:

[0007] A cylinder head cooling water jacket, comprising a lower water jacket, an upper water jacket and a total water jacket; the lower water jacket and the upper water jacket are communicated through an exhaust upper water inlet and an intermediate upper water inlet; the upper water jacket is provided with a partition, which divides one side of the upper water jacket and separates the upper water jacket into an intake partition and an exhaust partition, the exhaust upper water inlet is located within the exhaust partition, and the intermediate upper water inlet is located between the exhaust partition and the intake partition; the total water jacket is located at the side of the upper water jacket, the coolant of the exhaust partition enters the total water jacket through an inlet, and the coolant of the intake partition can flow into the inlet through a bypass hole opened in the partition.

[0008] Optionally, the lower water jacket is located below the upper water jacket, and the lower water jacket is provided with a water inlet on the lower side, and the water inlet is distributed on the outer edge of the lower water jacket, and the exhaust gas upper water inlet and the intermediate upper water inlet are located at the middle position of the lower water jacket.

[0009] Optionally, the cylinder head is provided with an air inlet channel and an exhaust channel, the air inlet partition of the upper water jacket is located on the side of the air inlet channel for cooling the air inlet channel, and the exhaust partition of the upper water jacket is located on the side of the exhaust channel for cooling the exhaust channel.

[0010] Optionally, the partition is located between the air inlet partition and the exhaust partition for adjusting the flow of the cooling liquid into the air inlet partition.

[0011] Optionally, the exhaust partition covers a first exhaust guide pipe and a second exhaust guide pipe, the first exhaust guide pipe is an exhaust guide pipe close to the outlet of the exhaust channel, the second exhaust guide pipe is an exhaust guide pipe away from the outlet of the exhaust channel, and the exhaust gas upper water inlet is located between the first exhaust guide pipe and the second exhaust guide pipe.

[0012] Optionally, the water inlet of the total 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 inlet partition, and the second water inlet is a water inlet away from the air inlet partition.

[0013] Optionally, the cooling liquid entering through the exhaust gas upper water inlet partially enters the total water jacket through the outer side of the first exhaust guide pipe from the second water inlet, and partially enters the total water jacket through the inner side of the first exhaust guide pipe from the first water inlet.

[0014] Optionally, the cooling liquid entering through the intermediate upper water inlet partially enters the total water jacket through the second exhaust guide pipe of the exhaust partition, the first exhaust guide pipe from the first water inlet and the second water inlet, and partially enters the total water jacket through the air inlet partition from the first water inlet.

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

[0016] The embodiment of the application also provides a cooling control method of the cylinder head cooling water jacket.

[0017] By adjusting the diameter of the intermediate upper water inlet, the exhaust gas upper water inlet and the bypass hole, and the on-off of the bypass hole, the proportion of the cooling liquid entering the air inlet partition and the exhaust partition is controlled.

[0018] By adjusting the diameter of the first water inlet and the second water inlet, and the inner side cross section of the first exhaust guide pipe, the proportion of the cooling liquid flowing through the outer side and the inner side of the first exhaust guide pipe is controlled.

[0019] The one or more technical solutions provided in the embodiment of the application have at least the following technical effects or advantages:

[0020] 1. The cooling jacket is divided into two zones by a partition, and is connected with the lower water jacket through two upper water inlets, wherein the intermediate 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 arranged on the partition according to needs, the diameters of the intermediate upper water inlet, the exhaust upper water inlet and the bypass hole are adjusted, and the bypass hole is turned on or turned off, so that the proportion of the cooling liquid entering the intake zone and the exhaust zone is controlled, the cylinder head upper water jacket is precisely cooled, the cylinder head intake and exhaust zones are cooled, and then a blank is realized, and the optimization of air duct heat management, performance, reliability, air duct injection, air intake organization and other different application requirements are met.

[0021] 2. The upper water jacket and the total water jacket are connected through two water inlets, and the position of the exhaust upper water inlet is arranged, so that the flow path of the cooling liquid is optimized, the cooling liquid flow on both sides of the exhaust duct is effectively adjusted, and the cooling demand in different application scenarios is met. Through the flow control of the two water inlets, more precise cooling management can be realized, and the overall heat exchange efficiency is improved.

[0022] The advantages of the additional aspects of the present application will be given in the following description, some of which will become apparent from the following description, or will be understood by those skilled in the art through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor. In addition, the mutual distance or size is exaggerated for showing the position of each part, and the schematic diagram is only used for illustration.

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

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

[0026] Figure 3 is a sectional view of the cylinder head provided by the embodiment of the present application;

[0027] Figure 4 is an exploded view of the cooling jacket provided by the embodiment of the present application;

[0028] Figure 5 is a whole schematic view of the cooling jacket provided by the embodiment of the present application;

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

[0030] Figure 7 is a top view of a cooling jacket (without bypass hole) provided by an embodiment of the present application;

[0031] Figure 8 is a top view of a cooling jacket (with bypass hole) provided by an embodiment of the present application;

[0032] Figure 9 is a sectional view of a cooling jacket (without bypass hole) provided by an embodiment of the present application;

[0033] Figure 10 is a sectional view of a cooling jacket (with bypass hole) provided by an embodiment of the present application;

[0034] Figure 11 is a schematic diagram of a cooling liquid flow path provided by an embodiment of the present application;

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

[0036] It should be noted that the following detailed description is illustrative only, and is intended to provide further description in connection with the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Furthermore, it should be understood that the use of the term "including", as well as other like terms, has the same meaning unless otherwise specified.

[0037] Glossary:

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

[0039] Cooling jacket: water-cooled cylinder head, cooling liquid flow through the channel, composed of casting and processing features.

[0040] Example 1

[0041] To solve the above technical problems, the embodiment provides a cylinder head cooling jacket, which realizes the partition cooling of the intake and exhaust passages 14 of the cylinder head 1 through an innovative jacket structure design and introduces a bypass structure to realize accurate control of the flow. Such design aims to optimize the heat management of the gas passage, improve the performance of the engine, enhance the reliability, and adapt to different application requirements, such as gas passage injection, intake organization optimization, etc.

[0042] As shown in Figure 1 , Figure 2 , Figure 3 , the cylinder head 1 is provided with an intake passage 13 and an exhaust passage 14, and the exhaust passage 14 has a first exhaust guide pipe 11 near the outlet of the exhaust passage 14 and a second exhaust guide pipe 12 away from the outlet of the exhaust passage 14.

[0043] As shown in Figure 4 , Figure 5 , Figure 6 , the cooling jacket includes a lower jacket 3, an upper jacket 4 and a total jacket 5. The lower jacket 3 and the upper jacket 4 are communicated through an exhaust upper water inlet 46 and an intermediate upper water inlet 45 (as shown in Figure 9 ), and the upper jacket 4 is provided with a partition plate 43 (as shown in Figure 7 ), which separates one side of the upper jacket 4 and divides the upper jacket 4 into an intake partition 41 and an exhaust partition 42. It should be noted that the division here does not completely separate the two areas, but separates one side of the upper jacket 4, that is, the original upper jacket 4 can be seen as a completely connected annular, and the upper jacket 4 is divided into a C shape through the setting of the partition plate 43. The exhaust upper water inlet 46 is located in the exhaust partition 42, and the intermediate upper water inlet 45 is located between the exhaust partition 42 and the intake partition 41 (as shown in Figure 7 , Figure 9 ). The total jacket 5 is located on the side of the upper jacket 4, and the cooling liquid of the exhaust partition 42 enters the total jacket 5 through the water inlet, and the cooling liquid of the intake partition 41 can flow into the water inlet through the bypass hole 44 (as shown in Figure 8 , Figure 10 ) opened by the partition plate 43.

[0044] The cylinder head cooling jacket of the present embodiment comprises a lower jacket 3, an upper jacket 4 and a total jacket 5. The lower jacket 3 is connected with the upper jacket 4 through an exhaust upper water inlet 46 and an intermediate upper water inlet 45. This design allows the cooling liquid to flow smoothly between the lower jacket 3 and the upper jacket 4, and facilitates effective thermal management. The upper jacket 4 is provided with a partition 43, which separates it into an intake sub-zone 41 and an exhaust sub-zone 42. The intake sub-zone 41 of the upper jacket 4 surrounds the intake port 13, so as to effectively cool the intake port 13 and prevent excessive temperature from affecting the intake performance. At the same time, the exhaust sub-zone 42 surrounds the exhaust port 14, so as to ensure that the exhaust port 14 can also be properly cooled. This layout ensures the sub-zone cooling effect of the intake port 13 and the exhaust port 14 during operation.

[0045] The partition 43 is located between the intake sub-zone 41 and the exhaust sub-zone 42, and plays a role in regulating the flow of cooling liquid into the intake sub-zone 41. The partition 43 and the bypass hole 44 formed in the partition 43 allow the flow of cooling liquid between the intake sub-zone 41 and the exhaust sub-zone 42 to be regulated, thereby realizing precise sub-zone cooling. By providing different flow channels, the cooling demand of the intake sub-zone 41 can be adjusted according to different working conditions. This adjustment mechanism enables the cooling of the intake port 13 to adapt to the corresponding thermal management demand under different loads and speeds, ensuring that the engine is always in the best working state.

[0046] The exhaust upper water inlet 46 is located in the exhaust sub-zone 42, so that part of the cooling liquid can directly enter the exhaust sub-zone 42 without passing through the intake sub-zone 41, thereby realizing the strong cooling demand of the exhaust sub-zone 42 and the exhaust conduit. The intermediate upper water inlet 45 is located between the intake sub-zone 41 and the exhaust sub-zone 42, and can adjust the amount of cooling liquid flowing into the intake sub-zone 41 according to demand, thereby controlling the cooling effect of the intake sub-zone 41. The total jacket 5 is located on the side of the upper jacket 4, ensuring that the cooling liquid flowing through the upper jacket 4 can smoothly flow into the total jacket 5.

[0047] The lower jacket 3 is located below the upper jacket 4, and the lower side of the lower jacket 3 is provided with a water inlet 31. The water inlet 31 is distributed around the outer edge of the lower jacket 3. The exhaust upper water inlet 46 and the intermediate upper water inlet 45 are located at the middle position of the lower jacket 3.

[0048] As shown in Figure 4 The lower jacket 3 is located below the upper jacket 4, and the water inlet 31 has four, which are arranged on the lower side of the lower jacket 3 and distributed around the outer edge of the lower jacket 3. This design can optimize the inflow path of the cooling liquid, ensuring that the cooling liquid is evenly distributed to the entire lower jacket 3. The exhaust upper water inlet 46 and the intermediate upper water inlet 45 are located at the middle position of the lower jacket 3, allowing the cooling liquid to flow and exchange sufficiently in the lower 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 duct 14, thereby achieving the purpose of enhancing 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. The first water inlet 51 is located near the air intake partition 41, while the second water inlet 52 is located farther away from the air intake partition 41. The arrangement of these two water inlets, combined with the positioning of the exhaust upper water inlet 46, optimizes the coolant flow path and effectively regulates the coolant flow into both sides of the exhaust duct to meet the cooling requirements of different application scenarios. By controlling the flow rate of these two water inlets, more precise cooling management can be achieved, improving overall heat exchange efficiency.

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

[0052] Coolant entering through the intermediate water inlet 45 flows partially through the second exhaust duct 12 and first exhaust duct 11 of the exhaust partition 42, entering the main water jacket 5 through the first and second water inlets 51 and 52. Coolant also flows partially through the intake partition 41, through the bypass hole 44 and first water inlet 51, and into the main water jacket 5. This design allows for flexible coolant distribution between the intake and exhaust partitions 41, 42, to accommodate varying cooling needs. This rational distribution further improves heat exchange efficiency. Typically, 10%-15% of the coolant is distributed to the intake air. For special applications or extreme situations, the bypass hole 44 is not machined, resulting in 100% flow on the exhaust side and 0% on the intake side.

[0053] In order to facilitate 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 port 13 and the exhaust port 14, and improves the thermal management efficiency of the engine. By precisely controlling the flow distribution of the cooling water, the cooling requirements in different application scenarios are met. By adjusting the diameter of the bypass hole 44, flexible adjustment of the cooling requirement is realized, and the engine performance is optimized.

[0055] The actual significance of controlling the cooling of the intake port 13 and the exhaust port 14 of the upper water jacket 4 is:

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

[0057] 2. Reduce the heat exchange of the intake port 13, increase the intake volume and power; - Ensure that the intake temperature is as low as possible under the premise of other requirements.

[0058] 3. Improve the heat exchange of the intake port 13, and solve the problem of wall atomization of port injection type fuel; - Methanol, gasoline engine of port injection type.

[0059] 4. Improve the heat exchange of the exhaust port 14, strengthen the cooling of the exhaust valve guide pipe, and reduce the exhaust temperature; - High-power density, high-temperature heavy-duty natural gas engine.

[0060] 5. Reduce the heat exchange of the exhaust port 14, reduce the heat exchange loss of the exhaust, and improve the efficiency of the aftertreatment; - High-thermal-efficiency diesel engine, which needs to reduce the heat exchange of the port.

[0061] Embodiment 2

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

[0063] By adjusting the diameters of the intermediate water inlet 45, the exhaust water inlet 46 and the bypass hole 44, and the on-off of the bypass hole 44, the proportion of the cooling liquid 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 side section of the first exhaust guide pipe 11, the proportion of the cooling liquid flowing through the outer side and the inner side of the first exhaust guide pipe 11 is controlled.

[0065] The cooling demand of the outer side of the first exhaust guide pipe 11 is higher than that of the inner side, which is controlled by the cross-sectional area of the first water inlet and the second water inlet of the total water jacket 5 and the reduction of the cross-sectional area of the inner side of the first exhaust guide pipe 11, realizing the cooling distribution of the inner side and the outer side of the first exhaust guide pipe 11, which can achieve the purpose of passing more flow through the outer side.

[0066] In order to make the technical scheme provided by the embodiment more clear, the use scenarios of different cylinder heads 1 are described:

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

[0068] (1) Intake port 13: The methanol engine is liquid injected in the intake port 13, and the methanol needs to be atomized in the intake port 13. The wall surface temperature of the intake port 13 is lower than the temperature of the cooling liquid, and the cooling liquid also needs to heat the wall surface. By processing a larger bypass hole 44, the flow rate ratio of the intake side is increased.

[0069] (2) Exhaust port 14: The exhaust duct of the methanol engine needs to be strengthened. The exhaust port 14 also needs to be strengthened due to high exhaust temperature. By making part of the water not pass through the second exhaust duct 12, directly cooling the first exhaust duct 11, and increasing the flow rate outside the first exhaust duct 11, the purpose of strengthening the cooling of a specific area is achieved.

[0070] (3) Thermal management: When the engine needs to continue to improve efficiency and reduce the heat taken away by the water jacket, it is realized by appropriately increasing the diameter of the bypass hole 44.

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

[0072] (1) Intake port 13: The intake port 13 of the natural gas engine is homogeneous mixture, which needs to reduce the temperature in the intake port 13, increase the intake density, avoid the cooling liquid heating the wall surface, and process a smaller diameter of the bypass hole 44, or even not process it, to realize the decrease of the flow rate ratio of the intake side.

[0073] (2) Exhaust port 14: The exhaust duct of the methanol engine needs to be strengthened. The exhaust port 14 also needs to be strengthened due to high exhaust temperature. By making part of the water not pass through the second exhaust duct 12, directly cooling the first exhaust duct 11, and increasing the flow rate outside the first exhaust duct 11, the purpose of strengthening the cooling of a specific area is achieved.

[0074] (3) Thermal management: When the engine needs to continue to improve efficiency and reduce the heat taken away by the water jacket, it is realized by appropriately increasing the diameter of the bypass hole 44, which is different from the trend of the first item. It is necessary to optimize the diameter of the bypass hole 44 in the performance development stage, comprehensively considering the exhaust temperature, thermal management, and intake cooling.

[0075] Although the specific embodiments of the present application have been described above with reference to the drawings, it is not a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications or variations made by those skilled in the art without creative labor on the basis of the technical solutions of the present application are still within the scope of protection of the present application.

Claims

1. A cylinder head cooling jacket characterized by, The lower water jacket, the upper water jacket and the total water jacket are included. The lower water jacket and the upper water jacket are communicated through the exhaust upper water inlet and the intermediate upper water inlet. The upper water jacket is provided with a partition plate, which 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 in the exhaust partition, and the intermediate upper water inlet is located between the exhaust partition and the intake partition. The total water jacket is located at the side of the upper water jacket, the cooling liquid of the exhaust partition enters the total water jacket through the water inlet, and the cooling liquid of the intake partition can flow into the water inlet through the bypass hole of the partition plate. The cylinder head has an intake port and an exhaust port, the intake partition of the upper water jacket is located at the periphery of the intake port for cooling the intake port, the exhaust partition of the upper water jacket is located at the periphery of the exhaust port for cooling the exhaust port, the partition is located between the intake partition and the exhaust partition for adjusting the flow of cooling liquid into the intake partition, the exhaust partition covers a first exhaust guide pipe and a second exhaust guide pipe, the first exhaust guide pipe is an exhaust guide pipe close to the outlet of the exhaust port, and the second exhaust guide pipe is an exhaust guide pipe away from the outlet of the exhaust port, and the exhaust upper water inlet is located between the first exhaust guide pipe and the second exhaust guide pipe.

2. The cylinder head cooling jacket of claim 1, wherein, The lower water jacket is located below the upper water jacket, the lower side of the lower water jacket is provided with a water inlet, the water inlet is distributed at the periphery of the outer edge of the lower water jacket, and the exhaust upper water inlet and the intermediate upper water inlet are located at the middle position of the lower water jacket.

3. The cylinder head cooling jacket of claim 1 wherein, The water inlet of the total water jacket includes a first water inlet and a second water inlet, wherein the first water inlet is a water inlet close to the intake partition, and the second water inlet is a water inlet away from the intake partition.

4. The cylinder head cooling jacket of claim 3 wherein, The cooling liquid entering through the exhaust upper water inlet partially enters the total water jacket from the second water inlet through the outside of the first exhaust guide pipe, and partially enters the total water jacket from the first water inlet through the inside of the first exhaust guide pipe.

5. The cylinder head cooling jacket of claim 3 wherein, The cooling liquid entering through the intermediate upper water inlet partially enters the total water jacket from the first water inlet and the second water inlet through the second exhaust guide pipe and the first exhaust guide pipe of the exhaust partition, and partially enters the total water jacket from the first water inlet through the intake partition.

6. The cylinder head cooling jacket of claim 1 wherein, The bypass hole penetrates the partition plate and extends to the side of the cylinder head, and a plug is installed on the bypass hole of the side of the cylinder head.

7. A cooling control method of a cylinder head cooling jacket according to any one of claims 1 to 6, characterized by, It includes: By adjusting the diameter of the intermediate upper water inlet, the exhaust upper water inlet and the bypass hole, and the on-off of the bypass hole, the proportion of the cooling liquid entering the intake partition and the exhaust partition is controlled; By adjusting the diameter of the first water inlet and the second water inlet, and the inside cross section of the first exhaust guide pipe, the proportion of the cooling liquid flowing through the outside and the inside of the first exhaust guide pipe is controlled.

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