Cylinder head water jacket and engine

Abstract

The application relates to the engine technical field and discloses a cylinder head water jacket and an engine, which comprise a water jacket body and a water outlet channel. The water jacket body comprises an air inlet side cooling part, an air outlet side cooling part and a nose bridge cooling part between the two. The water outlet channel is formed in the side wall of the nose bridge cooling part and is spaced apart from the bottom wall of the nose bridge cooling part. According to the cylinder head water jacket, the water outlet channel is spaced apart from the bottom wall of the nose bridge cooling part, a certain amount of cooling medium can be ensured, the problem of insufficient cooling medium in the cylinder head water jacket can be avoided, the cooling medium for key cooling parts such as spark plug holes and nose bridge areas of the cylinder head can meet the demand, the cooling effect and the cooling capacity of the cylinder head water jacket can be kept stable, the probability of local overheating of the cylinder head can be reduced, the temperature field can be reasonably controlled, the probability of thermal fatigue and even cracking of the cylinder head can be reduced, and the service life of the cylinder head is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a cylinder head water jacket and an engine. Background Technology

[0002] To prevent the high temperatures generated during engine operation from affecting the engine, a cooling system is needed to cool it. The cooling efficiency of the cooling system directly affects the engine's heat load, heat distribution, and operating efficiency.

[0003] In related technologies, the engine cylinder head is equipped with a cylinder head water jacket, and the cylinder block is equipped with a cylinder block water jacket. In the technical solution where the cylinder block water jacket draws cooling medium from the cylinder head water jacket, the location of the cooling medium draws is unreasonable, resulting in excessive diversion of cooling medium to the cylinder block water jacket. This can lead to insufficient cooling medium in some areas of the cylinder head water jacket, resulting in reduced cooling capacity. It can even cause localized overheating in critical areas such as the spark plug area and the cylinder head bridge area, leading to problems such as cylinder head cracking and leakage. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this utility model is to provide a cylinder head water jacket with a more rationally positioned outlet channel, which can avoid excessive flow and reduce the probability of insufficient cooling medium inside the cylinder head water jacket, thereby improving the stability and reliability of the cooling capacity of the cylinder head water jacket.

[0005] This application further proposes an engine employing the aforementioned cylinder head water jacket.

[0006] In a first aspect, this application proposes a cylinder head water jacket, comprising: a water jacket body and a water outlet channel, wherein the water jacket body includes an intake-side cooling section, an exhaust-side cooling section and a nose bridge cooling section located between the two, and the water outlet channel is formed on the side wall of the nose bridge cooling section and spaced apart from the bottom wall of the nose bridge cooling section.

[0007] According to the embodiments of this application, the cylinder head water jacket, by separating the water outlet channel from the bottom wall of the nose bridge cooling section, can ensure the retention of a certain amount of cooling medium, thereby avoiding the problem of insufficient cooling medium inside the cylinder head water jacket. This ensures that the amount of cooling medium used for key cooling parts such as spark plug holes and the nose bridge area of ​​the cylinder head can meet the requirements, so that the cooling effect and cooling capacity of the cylinder head water jacket can be kept stable, reducing the probability of local overheating of the cylinder head, reasonably controlling the temperature field, reducing the probability of thermal fatigue or even cracking of the cylinder head, and extending the service life of the cylinder head.

[0008] According to some embodiments of this application, the minimum distance L1 between the connection area of ​​the water outlet channel and the nose bridge cooling part and the bottom wall of the nose bridge cooling part is ≥2mm.

[0009] According to some embodiments of this application, the height L2 of the cylinder head water jacket is 10mm-30mm.

[0010] According to some embodiments of this application, the maximum distance L3 between the connection area of ​​the water outlet channel and the nose bridge cooling part and the bottom wall of the nose bridge cooling part is ≤0.5L2.

[0011] According to some embodiments of this application, the flow diameter D of the water outlet channel is 2mm-6mm.

[0012] According to some embodiments of this application, the nose bridge cooling section includes: a first diameter section, a variable diameter section, and a second diameter section connected sequentially in the flow direction, wherein the flow diameter of the second diameter section is greater than the flow diameter of the first diameter section, and the water outlet channel is connected to the second diameter section.

[0013] According to some embodiments of this application, the nose bridge cooling portion has a through hole, wherein the diameter of the through hole segment defined by the first diameter segment is larger than the diameter of the through hole segment defined by the second diameter segment.

[0014] According to some embodiments of this application, the cross-sectional width L4 of the second diameter segment is greater than or equal to the flow diameter D of the water outlet channel.

[0015] According to some embodiments of this application, the longitudinal cross-sectional shape of the nose bridge cooling section is rectangular or trapezoidal.

[0016] Secondly, this application provides an engine, including: the cylinder head water jacket described in the above embodiments.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the fit between the cylinder head water jacket and the cylinder head according to an embodiment of this application;

[0020] Figure 2 yes Figure 1 The center circle shows a magnified view of a portion of area A;

[0021] Figure 3 yes Figure 1 Schematic sectional view of the midline BB;

[0022] Figure 4 This is a schematic diagram of the temperature field distribution of the cylinder head according to an embodiment of this application.

[0023] Figure label:

[0024] Cylinder head water jacket 100, cylinder head 200

[0025] Nose bridge cooling section 10, first diameter section 11, variable diameter section 12, second diameter section 13, top wall 101, bottom wall 102, side wall 103.

[0026] Water outlet channel 20. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0029] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0032] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0035] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0036] In this application, "multiple" means two or more (including two).

[0037] In related technologies, the engine cooling system includes a cylinder block water jacket and a cylinder head water jacket. The cylinder block water jacket and the cylinder head water jacket can cool the cylinder block and the cylinder head respectively. In the cooling system, the cylinder block water jacket and the cylinder head water jacket form a cooling medium circulation path. That is, the cooling medium pumped into the cylinder block water jacket can flow out through the water outlet channel of the cylinder head water jacket and be introduced into the cylinder block water jacket.

[0038] Specifically, for the cooling system, especially when the engine is equipped with a pre-combustion chamber, the circulation path of the cooling medium is from the cylinder head water jacket to the cylinder block water jacket to ensure better targeted cooling of the pre-combustion chamber area.

[0039] However, the outlet channel draws coolant from the cylinder liner water jacket and supplies it to the cylinder block water jacket. If the location of the outlet channel for drawing coolant is not reasonable, it can easily lead to a large amount of coolant being supplied from the cylinder head water jacket to the cylinder block water jacket. This can cause localized water shortages in the cylinder head water jacket, especially in key cooling areas such as the spark plug holes and the cylinder head bridge area. This can reduce the cooling capacity of these key cooling areas, leading to localized overheating and deformation of the spark plugs and the bridge area, resulting in thermal fatigue, excessively high temperature fields, and even cylinder head cracking and leakage.

[0040] Based on this, this application proposes a cylinder head water jacket with a more reasonable cooling medium intake position in the water outlet channel, which makes the amount of cooling medium distributed from the cylinder head water jacket to the cylinder block water jacket more reasonable. It can also retain a certain amount of cooling medium to avoid insufficient cooling medium and improve cooling reliability and stability.

[0041] The following is for reference. Figures 1-4 The present invention describes a cylinder head water jacket 100 and an engine according to an embodiment of the present invention.

[0042] like Figure 1 and Figure 2 As shown, this application proposes a cylinder head water jacket 100, including: a nose bridge cooling section 10 and a water outlet channel 20. The water jacket body includes an intake side cooling section, an exhaust side cooling section and a nose bridge cooling section 10 located between the two. The water outlet channel 20 is formed on the side wall 103 of the nose bridge cooling section 10 and is spaced apart from the bottom wall 102 of the nose bridge cooling section 10.

[0043] It should be noted that the water outlet channel 20 is used to supply cooling medium to the cylinder block water jacket. During engine operation, the heat load increases with the increase of the ignition area. As components of the combustion chamber, the cylinder block and cylinder liner bear the heat load impact generated during combustion when the fuel mixture is ignited. The friction generated during piston movement further increases the heat load on the cylinder wall. The cylinder block water jacket is generally fitted around the outer periphery of the cylinder block and cylinder liner to cool them. The area above the cylinder block and cylinder liner corresponds to the cylinder head combustion chamber of the cylinder head 200. The cylinder head water jacket 100 is installed inside the cylinder head 200. The cylinder head water jacket includes an intake-side cooling section, an exhaust-side cooling section, and a nose bridge cooling section 10 located between the two. The intake-side cooling section cools the area on the cylinder head 200 where the intake manifold is formed, and the exhaust-side cooling section cools the area on the cylinder head 200 where the exhaust manifold is formed. The nose bridge cooling section 10 is arranged around the cylinder head combustion chamber. This means that the cooling medium intake position of the water outlet channel 20 on the cylinder head water jacket 100 needs to be opened in key cooling areas such as the cylinder head spark plug hole or the cylinder head nose bridge area. Therefore, the rationality of the cooling medium intake position is closely related to the cooling effect of the cylinder head water jacket 100, especially the cooling effect of key cooling areas.

[0044] It is understood that the structure of the cylinder head water jacket 100 shown in the views of this application is a partial schematic diagram of the cylinder head water jacket 100 (nose bridge cooling part 10), rather than an overall structural schematic diagram of the cylinder head water jacket 100. This application actually only shows the structure of the part of the cylinder head water jacket 100 that forms the water outlet channel 20 (i.e., the nose bridge cooling part 10). The side wall 103, bottom wall 102 and top wall 101 of the cylinder head water jacket 100 defined in this application correspond to the side wall 103, bottom wall 102 and top wall 101 of this partial sleeve-shaped water jacket structure of the cylinder head water jacket 100 that forms the water outlet channel 20.

[0045] Specifically, a water outlet channel 20 is formed on the side wall 103 of the nose bridge cooling section 10, and the water outlet channel 20 is spaced apart from the bottom wall 102 of the nose bridge cooling section 10, so that during the process of supplying cooling medium from the cylinder head water jacket 100 to the cylinder block water jacket, the cooling medium located between the bottom wall 102 of the nose bridge cooling section 10 and the top opening of the water outlet channel 20 (i.e., the end connected to the nose bridge cooling section 10) can remain inside the nose bridge cooling section 10 (see...). Figure 2 This ensures that the cooling medium in the cylinder head water jacket 100 is not excessively supplied to the cylinder block water jacket, thereby avoiding the phenomenon of insufficient cooling medium in some areas of the cylinder head water jacket 100. This ensures that key cooling parts of the cylinder head 200, such as the cylinder head spark plug hole and the cylinder head bridge area, can be adequately cooled, and the cooling effect and cooling capacity of the cylinder head water jacket 100 can remain stable.

[0046] Of course, by separating the water outlet channel 20 from the bottom wall 102 of the nose bridge cooling section 10, the cylinder water jacket position can also be prevented from becoming too cold, thus improving the overall cooling effect of the cylinder water jacket.

[0047] According to the embodiment of this application, the cylinder head water jacket 100, by separating the water outlet channel 20 from the bottom wall 102 of the nose bridge cooling section 10, can ensure that a certain amount of cooling medium is retained, so as to avoid the problem of insufficient cooling medium inside the cylinder head water jacket 100. This ensures that the amount of cooling medium used for key cooling parts such as the cylinder head spark plug holes and the cylinder head nose bridge area can meet the requirements, so that the cooling effect and cooling capacity of the cylinder head water jacket 100 can be kept stable, reducing the probability of local overheating of the cylinder head 200, reasonably controlling the temperature field, reducing the probability of thermal fatigue or even cracking of the cylinder head 200, and extending the service life of the cylinder head 200.

[0048] The cylinder head nose area refers to the area between adjacent exhaust ports on the cylinder head. Because this area is close to the combustion chamber, it is affected by the high temperature of the combustion of the fuel mixture and the high temperature of the exhaust gas in the combustion chamber, resulting in a high temperature in the cylinder head nose area. In addition, the cylinder head nose area has a complex structure, making it difficult to cool and prone to thermal fatigue cracks.

[0049] It should be noted that the cooling medium referred to in this application can be pure water, or a mixed medium containing water, such as antifreeze, coolant, etc. Of course, it can also be other liquid media with high specific heat capacity, such as cooling oil.

[0050] like Figure 2 As shown, according to some embodiments of this application, the minimum distance L1 between the connection area of ​​the water outlet channel 20 and the nose bridge cooling section 10 and the bottom wall 102 of the nose bridge cooling section 10 is ≥2mm.

[0051] Specifically, the water outlet channel 20 can be constructed as a water inlet pipe, and one end of the water outlet channel 20 is connected to the nose bridge cooling section 10. The other end of the water outlet channel 20 extends downward at an angle relative to the nose bridge cooling section 10 and is connected to the cylinder water jacket inlet on the side end face of the cylinder water jacket facing the cylinder head water jacket 100. The minimum distance between the lowest point of the end of the water outlet channel 20 connected to the nose bridge cooling section 10 and the bottom wall 102 of the nose bridge cooling section 10 is greater than or equal to 2mm, such as 2mm, 2.5mm, etc.

[0052] Therefore, it can effectively prevent excessive cooling medium from the cylinder head water jacket 100 from entering the cylinder block water jacket through the outlet channel 20, and can prevent the amount of cooling medium in key cooling parts such as the cylinder head spark plug hole and the cylinder head bridge area from being insufficient to meet the cooling requirements.

[0053] This makes the distance between the bottom wall 102 of the nose bridge cooling section 10 and the water outlet channel 20 more reasonable, avoiding the distance between the water outlet channel 20 and the bottom wall 102 of the water outlet channel 20 being too close, which would make it difficult to retain a sufficient amount of cooling medium in the nose bridge cooling section 10 for cooling, thus avoiding excessive supply of cooling medium to the cylinder head water jacket, and ensuring that the cooling effect and cooling efficiency of the cylinder head water jacket 100 remain stable.

[0054] Combination Figure 1 and Figure 2 As shown, according to some embodiments of this application, the height L2 of the cylinder head water jacket 100 is 10mm-30mm.

[0055] For example, the height of the cylinder head water jacket 100 is 10mm, 15mm, 20mm, 25mm, 30mm, etc.

[0056] Specifically, ensuring that the height of the cylinder head water jacket 100 is not less than 10mm allows for sufficient flow area, preventing insufficient cooling medium flow and ensuring that both the cylinder head water jacket 100 and the cylinder block water jacket can meet cooling requirements, effectively preventing localized high temperatures. Conversely, ensuring that the height of the cylinder head water jacket 100 is not greater than 30mm allows for more reasonable space utilization while still meeting cooling requirements, reducing the difficulty of arranging the cylinder head water jacket 100 and enabling its structure to meet the lightweight design requirements of the cylinder head 200.

[0057] Combination Figure 2 and Figure 3 As shown, according to some embodiments of this application, the maximum distance L3 between the connection area of ​​the water outlet channel 20 and the nose bridge cooling section 10 and the bottom wall 102 of the nose bridge cooling section 10 is ≤0.5L2.

[0058] In other words, the distance between the top portion of the connection area between the water outlet channel 20 and the nose bridge cooling section 10 and the bottom wall 102 of the nose bridge cooling section 10 is not less than half the height of the nose bridge cooling section 10.

[0059] It is understandable that the flow rate of the cooling medium in the nose bridge cooling section 10 is faster relative to the bottom wall 102 of the nose bridge cooling section 10, while the flow rate of the cooling medium relative to the top wall 101 of the nose bridge cooling section 10 is lower. By using the above-mentioned range dimensions, the relative position of the water outlet channel 20 can be set closer to the bottom wall 102 of the nose bridge cooling section 10, so that the flow rate of the cooling medium flowing out of the water outlet channel 20 is faster. This can avoid the flow rate of the cooling medium flowing out of the water outlet channel 20 being too slow, thereby avoiding insufficient cooling medium in the cylinder water jacket and ensuring the cooling effect and cooling efficiency of the cylinder water jacket.

[0060] like Figure 2As shown, according to some embodiments of this application, the flow diameter D of the water outlet channel 20 is 2mm-6mm.

[0061] For example, the flow diameter of the water outlet channel 20 is 2mm, 3mm, 4mm, 5mm, 6mm, etc.

[0062] Understandably, when the flow diameter of the water outlet channel 20 is less than 2mm, the amount of cooling medium supplied to the cylinder water jacket by the water outlet channel 20 per unit time is too small, which can easily lead to insufficient cooling medium flow in the cylinder water jacket, resulting in a decrease in the cooling capacity of the cylinder water jacket and difficulty in meeting the cooling requirements. In addition, during the machining of the water outlet channel 20 on the cylinder head 200, the diameter of the machining tool is too small, which increases the machining difficulty of the water outlet channel 20, increases the machining cost, and the machining process is prone to tool breakage and difficulty in retracting the tool. When the flow diameter of the water outlet channel 20 is greater than 6mm, the space occupied by the water outlet channel 20 is too large, which makes it difficult to meet the compact design requirements of the cylinder head 200.

[0063] In other words, by controlling the flow diameter of the water outlet channel 20 to 2mm-6mm, while ensuring that the water outlet channel 20 can supply a sufficient amount of cooling medium to the cylinder water jacket, the processing difficulty of the water outlet channel 20 can be reduced, and the compact design requirements of the cylinder head 200 can also be taken into account.

[0064] like Figure 3 As shown, according to some embodiments of this application, the nose bridge cooling section 10 includes: a first diameter section 11, a variable diameter section 12 and a second diameter section 13 connected sequentially in the flow direction, wherein the flow diameter of the second diameter section 13 is greater than the flow diameter of the first diameter section 11, and the water outlet channel 20 is connected to the second diameter section 13.

[0065] Specifically, in the direction of cooling medium flow, a first diameter section 11, a variable diameter section 12, and a second diameter section 13 are arranged sequentially, such that the flow diameter of the first diameter section 11 is smaller than that of the second diameter section 13, and a variable diameter section 12 is arranged between them. The arrangement of the second diameter section 13 allows more cooling medium with a higher flow rate to flow through. The arrangement of the first diameter section 11 can increase the speed of the cooling medium in the upper part of the nose bridge cooling section 10, thereby increasing the flow rate of the cooling medium in the upper part of the nose bridge cooling section 10, so as to further improve the cooling effect and cooling efficiency of the cylinder water jacket.

[0066] Furthermore, the water outlet channel 20 is connected to the nose bridge cooling section 10 on the second diameter section 13, so that a faster-flowing cooling medium can be supplied to the cylinder water jacket through the water outlet channel 20, while also taking into account the cooling capacity of the cylinder water jacket.

[0067] like Figure 3As shown, according to some embodiments of this application, the nose bridge cooling portion 10 has a through hole, and the diameter of the through hole segment defined by the first diameter segment 11 is larger than the diameter of the through hole segment defined by the second diameter segment 13.

[0068] The through hole design allows the nose bridge cooling section 10 to be positioned around the cylinder head spark plug hole. The diameter of the through hole section defined by the first diameter segment 11 is larger than the diameter of the through hole section defined by the second diameter segment 13. This makes the outer contour of the nose bridge cooling section 10 conducive to guiding the cooling medium, thereby guiding the cooling medium to cool the two key cooling areas of the cylinder head 200: the cylinder head spark plug hole and the cylinder head nose bridge area, further improving the cooling effect and efficiency of the cylinder head water jacket 100.

[0069] like Figure 3 As shown, according to some embodiments of this application, the cross-sectional width L4 of the second diameter segment 13 is greater than or equal to the flow diameter D of the water outlet channel 20, which can ensure that the flow rate of the cooling medium near the cylinder head spark plug hole and the cylinder head bridge area meets the cooling requirements, so as to effectively cool the cylinder head spark plug hole and the cylinder head bridge area.

[0070] like Figure 1 and Figure 2 As shown, according to some embodiments of this application, the longitudinal cross-sectional shape of the nose bridge cooling section 10 is rectangular or trapezoidal, which can allow for a greater amount of cooling medium to remain in the nose bridge cooling section 10, thereby improving the cooling effect of the cylinder head water jacket 100.

[0071] It should be pointed out that, Figure 1 A longitudinal section of the nose bridge cooling section 10 is shown. Figure 3 A cross-section of the nose bridge cooling section 10 is shown.

[0072] Combination Figure 4 As shown, the cylinder head water jacket 100 of this embodiment, by reasonably setting the position of the water outlet channel 20, can prevent the cooling medium in the cylinder head water jacket 100 from being excessively diverted to the cylinder block water jacket, so that the cooling effect of the cylinder head spark plug hole and the cylinder head nose area can be kept stable, which can meet the cooling requirements of the cylinder head spark plug hole and the cylinder head nose area. The highest temperature of the temperature field of the cylinder head spark plug hole and the cylinder head nose area is 216.8℃, which is 20℃-30℃ lower than before optimization, far below the temperature resistance limit of the cylinder head 200 material. This can reduce the local overheating deformation of the cylinder head 200 and cylinder block caused by poor cooling, reduce the risk of engine leakage, and extend the service life of the engine.

[0073] It should be noted that, see Figure 4The area indicated by the arrow is the region with the highest temperature in the cylinder head spark plug hole and cylinder head bridge area, with a temperature of 216.8℃. After optimization, the temperature in this area has been reduced, which can reduce the probability of local overheating deformation of the cylinder head 200, thereby improving the service life of the engine.

[0074] This application provides an engine, including: the cylinder head water jacket 100 in the above embodiment.

[0075] According to the engine of the embodiment of this application, the cylinder head water jacket 100 described above results in lower cooling pressure in the engine cooling system, better cooling effect of the cylinder head 200 and cylinder block, better engine cooling effect, improved engine working stability and reliability, and extended engine service life.

[0076] The cylinder head water jacket 100 and other components and operations of the engine according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cylinder head water jacket, characterized in that, include: The water jacket body includes an intake side cooling section, an exhaust side cooling section, and a nose bridge cooling section (10) located between the two. Water outlet channel (20) is formed on the side wall (103) of the nose bridge cooling part (10) and spaced apart from the bottom wall (102) of the nose bridge cooling part (10).

2. The cylinder head water jacket according to claim 1, characterized in that, The minimum distance L1 between the connection area of ​​the water outlet channel (20) and the nose bridge cooling part (10) and the bottom wall (102) of the nose bridge cooling part (10) is ≥2mm.

3. The cylinder head water jacket according to claim 1, characterized in that, The height L2 of the cylinder head water jacket is 10mm-30mm.

4. The cylinder head water jacket according to claim 3, characterized in that, The maximum distance L3 between the connection area of ​​the water outlet channel (20) and the nose bridge cooling part (10) and the bottom wall (102) of the nose bridge cooling part (10) is ≤0.5L2.

5. The cylinder head water jacket according to any one of claims 1-4, characterized in that, The flow diameter D of the water outlet channel (20) is 2mm-6mm.

6. The cylinder head water jacket according to claim 1, characterized in that, The nose bridge cooling section (10) includes a first diameter section (11), a variable diameter section (12), and a second diameter section (13) connected sequentially in the flow direction. The flow diameter of the second diameter section (13) is greater than that of the first diameter section (11). The water outlet channel (20) is connected to the second diameter section (13).

7. The cylinder head water jacket according to claim 6, characterized in that, The nose bridge cooling section (10) has a through hole, the diameter of the through hole segment defined by the first diameter segment (11) is greater than the diameter of the through hole segment defined by the second diameter segment (13).

8. The cylinder head water jacket according to claim 6, characterized in that, The cross-sectional width L4 of the second diameter segment (13) is greater than or equal to the flow diameter D of the water outlet channel (20).

9. The cylinder head water jacket according to claim 1, characterized in that, The longitudinal cross-sectional shape of the nose bridge cooling section (10) is rectangular or trapezoidal.

10. An engine, characterized in that, include: The cylinder head water jacket according to any one of claims 1-9.

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