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, wherein the middle water jacket part has a first avoiding hole for avoiding spark plugs and oil injectors, the air inlet side water jacket has lateral inlets located on both sides of the middle line of the first avoiding hole and a middle inlet located on the middle line of the first avoiding hole, first shunt parts are symmetrically arranged on both sides of the middle line of the first avoiding hole, the first shunt parts are suitable for shunting the cooling medium flowing into the lateral inlets, at least part of the cooling medium flows to the circumferential side of the first avoiding hole, and the cooling medium flowing into the middle inlet directly flows to the circumferential side of the first avoiding hole. Therefore, the first shunt parts can shunt the cooling medium flowing into the lateral inlets, the flow resistance of the cooling medium flowing through the middle water jacket part can be reduced, the cooling medium pressure loss can be reduced, the hydraulic efficiency of the cooling system is improved, the flow stability of the cooling medium is ensured, and the cooling effect and the cooling efficiency of the cylinder head water jacket are improved.

Description

Technical Field

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

[0002] In related technologies, cylinder head water jackets need to withstand high heat loads. In order to avoid components such as valve guides and spark plugs, the flow channels inside the cylinder head water jacket are designed to be winding and tortuous. This will increase the pressure loss during the flow of the medium in the cooling zone inside the cylinder head water jacket, resulting in a decrease in the cooling capacity of the cylinder head water jacket and causing local overheating.

[0003] Application content

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this application is to provide a cylinder head water jacket with lower pressure loss and better cooling effect.

[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: an intake-side water jacket, the intake-side water jacket comprising: a plurality of sub-water jackets arranged sequentially in a first direction, each sub-water jacket extending from the intake side to the exhaust side in a second direction, the first direction and the second direction being orthogonal, each sub-water jacket comprising an intake-side water jacket portion, an intermediate water jacket portion and an exhaust-side water jacket portion, the exhaust-side water jacket portion forming an intake-side water jacket outlet; wherein the intermediate water jacket portion has a first clearance hole for avoiding spark plugs and fuel injectors, the intake-side water jacket has lateral inlets located on both sides of the centerline of the first clearance hole and an intermediate inlet located on the centerline of the first clearance hole, the first diversion portion being symmetrically arranged on both sides of the centerline of the first clearance hole, the first diversion portion being adapted to divert the cooling medium flowing in from the lateral inlets and to allow at least a portion of the cooling medium to flow to the periphery of the first clearance hole, the cooling medium entering from the intermediate inlet flowing directly to the periphery of the first clearance hole.

[0007] According to the embodiments of this application, the cylinder head water jacket is provided with a first diversion section in the middle water jacket section. The first diversion section diverts the cooling medium entering from the side inlet, which can reduce the flow resistance of the cooling medium when it flows through the middle water jacket section, thereby reducing the pressure loss of the cooling medium, improving the hydraulic efficiency of the cooling system, ensuring the stable flow of the cooling medium, and thus improving the cooling effect and cooling efficiency of the cylinder head water jacket.

[0008] According to some embodiments of this application, a first diversion section defines a first diversion channel on the side adjacent to the first clearance hole, and a second diversion channel is defined on the side of the first diversion section away from the first clearance hole. The cooling medium flowing in laterally enters part of the first diversion channel and part of the second diversion channel.

[0009] According to some embodiments of this application, the distance between the end of the first diversion section adjacent to the intake side water jacket section and the first clearance hole is greater than the distance between the end of the first diversion section adjacent to the exhaust side water jacket section and the first clearance hole.

[0010] According to some embodiments of this application, the exhaust-side water jacket has a second clearance hole for avoiding the exhaust valve, and the intermediate water jacket also has a second diversion section, which is located between the first diversion section and the second clearance hole.

[0011] According to some embodiments of this application, the second diversion section is spaced apart from the second clearance hole so that the cooling medium flows around the second clearance hole in a clockwise or counterclockwise direction.

[0012] According to some embodiments of this application, the cylinder head water jacket further includes a layered water jacket, which includes an upper water jacket and a lower water jacket. The exhaust-side water jacket has a top outlet and a side outlet, with the top outlet communicating with the upper water jacket and the side outlet communicating with the lower water jacket.

[0013] According to some embodiments of this application, the intermediate water jacket further includes a flow squeezing section, which is located on the side of the first flow diversion section away from the first clearance hole and upstream of the top outlet and the side outlet.

[0014] According to some embodiments of this application, the outer contour of the extrusion section is recessed toward the first clearance hole.

[0015] According to some embodiments of this application, in the first direction, a top outlet is provided between adjacent sub-water jackets and on the end edge of the sub-water jacket located at the end.

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

[0017] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application 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 top view of the cylinder head water jacket 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 This is a side view of the cylinder head water jacket according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the intake-side water jacket according to an embodiment of this application;

[0023] Figure 5 yes Figure 4 The middle circle shows a magnified view of a portion of region B.

[0024] Figure label:

[0025] Cylinder head water jacket 100,

[0026] Layered water jacket 10, lower water jacket 11, upper water jacket 12, main body sleeve 121, cooling medium outlet 1211, arc-shaped part 1212, protrusion 1213, second inlet 1214, clearance sleeve 122, end sub-sleeve 122a, middle sub-sleeve 122b, valve hole 1221, first guide zone 1222, second guide zone 1223, third guide zone 1224, first inlet 1225.

[0027] Intake side water jacket 20, sub-water jacket 21, intake side water jacket section 211, intermediate inlet 2111, side inlet 2112, intermediate water jacket section 212, first clearance hole 2121, first flow divider section 2122, squeeze flow section 2123, second flow divider section 2124, exhaust side water jacket section 213, second clearance hole 2131, top outlet 2132, side outlet 2133. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "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 based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0035] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0036] In the description of this application, 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.

[0037] In this application, "multiple" means two or more (including two).

[0038] In related technologies, cylinder head water jackets are used to cool and dissipate heat from the engine cylinder head and need to withstand extreme thermal loads. However, in order to avoid structures such as valve guides and spark plugs, the flow channel design of cylinder head water jackets is relatively winding and tortuous. In addition, in order to ensure the heat dissipation capacity of cylinder head water jackets, the exhaust side water jacket section located on the exhaust side usually needs to be designed as a curved, narrow and densely structured flow channel configuration. That is, due to the complex flow channel design under high thermal loads and the structural limitations of the cylinder head water jacket itself, the pressure loss of the cylinder head water jacket is large, which leads to a decrease in cooling capacity.

[0039] However, a decrease in the cooling capacity of the cylinder head water jacket can lead to the following technical problems:

[0040] 1. Cylinder head deformation and cracking, cylinder head gasket seal failure: When the cylinder head water jacket pressure loss is too large, the cooling medium flow rate decreases, and the heat exchange efficiency of high-temperature areas such as the cylinder head bridge area, valve seats, injector holes, and spark plug holes decreases, leading to localized temperature increases, uneven temperature field distribution, and high thermal gradient stress. This causes deformation of the cylinder head bottom surface, resulting in cylinder head gasket seal failure, cooling medium leakage, and in severe cases, destruction of the cylinder head gasket. When the sustained high thermal gradient stress exceeds the material's fatigue limit, overheating and cracking occur in areas such as the cylinder head bridge area, valve seats, injector holes, and spark plug holes.

[0041] 2. Loose valve seat: Localized high temperature can cause deformation of the valve seat hole and deterioration of material properties, leading to failure of the interference fit, which may cause the valve seat to loosen or even fall off.

[0042] 3. Deterioration of engine oil: When the high temperature of the cylinder head is conducted to parts such as the camshaft and valve mechanism, it will cause the local engine oil temperature to be too high, which will accelerate the oxidation of engine oil, reduce viscosity, form sludge, and reduce lubrication performance.

[0043] 4. Increased tendency to knock: High cylinder head temperature leads to increased combustion chamber surface temperature, increasing the tendency for auto-ignition of the final mixture, resulting in knocking, damaging the piston and cylinder liner, triggering the ECU's de-ignition strategy, and causing a decrease in output power and thermal efficiency.

[0044] 5. Overload or even damage to the water pump: In order to maintain the flow rate of the cooling medium, the water pump needs to provide a higher head and power, which may lead to pump overload, cavitation noise, efficiency reduction and premature failure.

[0045] 6. Localized boiling in the cooling system creates vapor lock. In high-resistance areas, the cooling medium velocity drops sharply or stagnates, leading to saturated boiling under heat load and the generation of steam bubbles. These bubbles accumulate and block the flow channels, creating dead zones and a vicious cycle of flow and heat transfer.

[0046] Based on this, this application proposes a cylinder head water jacket that can optimize the flow path of the cooling medium, reduce flow resistance, thereby reducing the pressure loss of the cylinder head water jacket, improving cooling efficiency and cooling effect, thus reducing the probability of the above-mentioned technical problems and extending the service life of the engine.

[0047] The following is for reference. Figures 1-5 This application describes a cylinder head water jacket 100 and an engine according to embodiments thereof.

[0048] like Figure 4 and Figure 5 As shown, the cylinder head water jacket 100 includes an intake side water jacket 20. The intake side water jacket 20 includes a plurality of sub-water jackets 21 arranged sequentially in a first direction. Each sub-water jacket 21 extends from the intake side to the exhaust side in a second direction. The first direction and the second direction are orthogonal. Each sub-water jacket 21 includes an intake side water jacket portion 211, an intermediate water jacket portion 212, and an exhaust side water jacket portion 213. The exhaust side water jacket portion 213 forms an outlet for the intake side water jacket 20.

[0049] It should be noted that the intake side and exhaust side are relative concepts. The cylinder head integrates the exhaust manifold and the intake manifold, or the cylinder head is provided with the exhaust manifold and the intake manifold. The side of the intake side water jacket 20 relative to the intake manifold is defined as the intake side, and the side relative to the exhaust manifold is defined as the exhaust side. On the cylinder head, the temperature in the area where the exhaust manifold is located is relatively high, and the temperature in the area where the intake manifold is located is relatively low. This makes the layered water jacket 10 located on the exhaust side of the intake side water jacket 20. The layered water jacket 10 can be supplied with cooling medium through the exhaust side water jacket part 213 located on the exhaust side, so that the cooling medium flows from the intake side to the exhaust side, rather than from the exhaust side to the intake side. This can make the initial temperature of the cooling medium lower, thereby improving the cooling effect of the intake side water jacket 20 and the layered water jacket 10.

[0050] The intermediate water jacket 212 has a first clearance hole 2121 to avoid the spark plug and the fuel injector. The intake side water jacket 20 has lateral inlets 2112 on both sides of the centerline of the first clearance hole 2121 and a middle inlet 2111 on the centerline of the first clearance hole 2121. A first diversion section 2122 is symmetrically arranged on both sides of the centerline of the first clearance hole 2121. The first diversion section 2122 is adapted to divert the cooling medium flowing into the lateral inlet 2112 and make at least part of the cooling medium flow to the periphery of the first clearance hole 2121. The cooling medium entering the middle inlet 2111 flows directly to the periphery of the first clearance hole 2121.

[0051] Specifically, the first clearance hole 2121 on the intermediate water jacket 212 can avoid structures such as spark plugs and fuel injectors, and can be arranged around spark plugs and fuel injectors to achieve cooling of spark plugs and fuel injectors. The cooling medium entering through the side inlet 2112 is suitable for flowing to the intake side water jacket 20 outlet under the guiding action of the first diversion section 2122, and the other part flows towards the first clearance hole 2121. The cooling medium entering through the intermediate inlet 2111 is divided into two streams under the action of the outer contour of the first clearance hole 2121. One stream flows counterclockwise around the first clearance hole 2121, and the other stream flows counterclockwise around the first clearance hole 2121. The cooling medium entering through the intermediate inlet 2111 and the cooling medium entering through the side inlet 2112 merge on the side of the first clearance hole 2121 away from the intake side water jacket 211 and then flow to the intake side outlet.

[0052] Understandably, the cooling medium flowing in through the side inlet 2112 can be divided into two streams by the diversion action of the first diversion section 2122. One stream flows towards the exhaust side water jacket section 213, and the other flows towards the first clearance hole 2121. At the same time, in conjunction with the cooling medium entering through the middle inlet 2111, effective cooling of the area around the first clearance hole 2121 is achieved, improving the cooling stability and reliability of the area of ​​the first clearance hole 2121. Meanwhile, the first diversion section 2122 achieves reasonable diversion of the cooling medium flowing in through the side inlet 2112, which can reduce the flow resistance of the cooling medium when it flows through this area, reduce the pressure loss of the cooling medium, improve the hydraulic efficiency of the cooling system, and ensure the stability and reliability of the cooling medium flow rate.

[0053] According to the embodiment of this application, the cylinder head water jacket 100 has a first diversion section 2122 provided in the intermediate water jacket section 212. The first diversion section 2122 diverts the cooling medium entering from the lateral inlet 2112, which can reduce the flow resistance of the cooling medium when it flows through the intermediate water jacket section 212, thereby reducing the pressure loss of the cooling medium, improving the hydraulic efficiency of the cooling system, ensuring the stable flow of the cooling medium, and improving the cooling effect and cooling efficiency of the cylinder head water jacket 100.

[0054] like Figure 5 As shown, according to some embodiments of this application, the first diversion section 2122 defines a first diversion channel on the side adjacent to the first clearance hole 2121, and the first diversion section 2122 defines a second diversion channel on the side away from the first clearance hole 2121. The cooling medium flowing in from the lateral inlet 2112 enters part of the first diversion channel and part of the second diversion channel.

[0055] In other words, the first diversion section 2122 can split the cooling medium entering from the side inlet 2112 into two streams. One stream flows through the first diversion channel, and the other flows through the second diversion channel. The cooling medium in the second diversion channel can flow directly to the exhaust side to the outlet of the water jacket 20 on the intake side, while the cooling medium in the first diversion channel can flow around the first clearance hole 2121 to enhance heat dissipation in the area where the first clearance hole 2121 is located. This reduces flow resistance and increases the flow velocity of the cooling medium, thereby improving cooling efficiency and cooling effect.

[0056] Combination Figure 4 and Figure 5 As shown, according to some embodiments of this application, the distance between the end of the first diverter 2122 adjacent to the intake side water jacket 211 and the first clearance hole 2121 is greater than the distance between the end of the first diverter 2122 adjacent to the exhaust side water jacket 213 and the first clearance hole 2121.

[0057] In other words, the first diversion section 2122 can be constructed as an elongated oval diversion rib. The end of the elongated oval diversion rib adjacent to the intake side water jacket section 211 is relatively far away from the first clearance hole 2121, while the end of the elongated oval diversion rib adjacent to the exhaust side water jacket section 213 is relatively close to the first clearance hole 2121, so that the second diversion channel can guide the cooling medium toward the first clearance hole 2121, so as to point to the first clearance hole 2121 used to avoid the spark plug and exhaust valve, effectively achieving cooling of the periphery of the first clearance hole 2121.

[0058] like Figure 3 As shown, according to some embodiments of this application, the cylinder head water jacket 100 further includes: a layered water jacket 10, which includes: an upper water jacket 12 and a lower water jacket 11. The exhaust side water jacket 213 has a top outlet 2132 and a side outlet 2133. The top outlet 2132 is connected to the upper water jacket 12, and the side outlet 2133 is connected to the lower water jacket 11.

[0059] Therefore, the top outlet 2132 of the exhaust side water jacket 213 can supply the cooling medium to the upper water jacket 12, and the side outlet 2133 can supply the cooling medium to the lower water jacket 11. This makes the amount of cooling medium flowing into the upper water jacket 12 and the lower water jacket 11 more reasonable, and can improve the cooling effect and cooling efficiency of the layered water jacket 10.

[0060] like Figure 4 and Figure 5 As shown, according to some embodiments of this application, the exhaust-side water jacket 213 has a second clearance hole 2131 for avoiding the exhaust valve, and the intermediate water jacket 212 also has a second diversion section 2124. The second diversion section 2124 is located between the first diversion section 2122 and the second clearance hole 2131. The second diversion section 2124 is spaced apart from the second clearance hole 2131 so that the cooling medium flows around the second clearance hole 2131.

[0061] Specifically, the cooling medium entering through the side inlet 2112 and flowing through the first diversion channel can merge with the cooling medium entering through the middle inlet 2111. The merged cooling medium can then flow through the second diversion section 2124. The second diversion section 2124 can block and guide the cooling medium to distribute it evenly to the upper water jacket 12 and the lower water jacket 11 of the layered water jacket 10, so that the overall cooling effect of the cylinder head water jacket 100 is more stable and the cooling uniformity of the layered water jacket 10 is better.

[0062] like Figure 5 As shown, according to some embodiments of this application, the second diversion section 2124 is spaced apart from the second clearance hole 2131 so that the cooling medium flows around the second clearance hole 2131 in a clockwise or counterclockwise direction.

[0063] Therefore, the cooling medium entering through the intermediate inlet 2111 can, under the action of the first clearance hole 2121, flow clockwise around the first clearance hole 2121 and counterclockwise around the first clearance hole 2121. After the cooling medium entering through the intermediate inlet 2111 merges with the cooling medium in the first diversion channel, it can, under the action of the second diversion section 2124, flow in one direction toward the top outlet 2132 and in the other direction toward the side outlet 2133, thereby realizing the diversion supply to the upper water jacket 12 and the lower water jacket 11.

[0064] Understandably, one stream flows towards the top outlet 2132, which can achieve counterclockwise flow around at least a portion of the contour of the second clearance hole 2131, and another stream flows towards the side outlet 2133, which can achieve clockwise flow around at least a portion of the contour of the second clearance hole 2131, thereby forming a circulation around at least a portion of the second clearance hole 2131, which can achieve enhanced cooling of the area where the second clearance hole 2131 is located.

[0065] Combination Figure 4 and Figure 5As shown, according to some embodiments of this application, the intermediate water jacket 212 further includes a squeezing section 2123, which is located on the side of the first diversion section 2122 away from the first clearance hole 2121, and is located upstream of the top outlet 2132 and the side outlet 2133.

[0066] Specifically, the outer contour of the extrusion section 2123 is recessed toward the first clearance hole 2121, and can be constructed as a concave arc or a concave rhombus. The cooling medium in the second diversion channel can flow through the extrusion section 2123. The extrusion section 2123 generally has a concave arc or concave rhombus flow direction guiding feature, which can be used to regulate the flow distribution of the cooling medium flowing through this place, so that the amount of cooling medium flowing through the top outlet 2132 is greater than the amount of cooling medium flowing through the side outlet 2133, and can increase the flow coverage area of ​​the cooling medium between two adjacent cylinders, which is beneficial to the cooling of the inter-cylinder area and avoids the deformation of the cylinder head bottom surface caused by excessive inter-cylinder temperature.

[0067] In other words, through the coordinated regulation of the first diversion section 2122, the second diversion section 2124, and the squeezing section 2123, the top outlet 2132 can have sufficient cooling medium flow, which can enhance the cooling effect in the inter-cylinder area. At the same time, the flow of cooling medium flowing down to the lower water jacket 11 can be appropriately limited. Based on the overall heat load distribution of the cylinder head, differentiated cooling demand can be adjusted, which can improve the uniformity of the cylinder head temperature field, prevent local overheating, improve the cooling efficiency of the engine, improve the working stability and reliability of the engine, and extend the service life of the engine.

[0068] like Figure 4 As shown, according to some embodiments of this application, in the first direction, a top outlet 2132 is provided between adjacent sub-water jackets 21 and on the end edge of the sub-water jacket 21 located at the end.

[0069] For example, if the engine is a four-cylinder engine, then there are five top outlets 2132, namely the top outlets 2132 between adjacent cylinders and the top outlets 2132 corresponding to the outer boundaries of the two outermost cylinders in the first direction. The cooling medium entering the upper water jacket 12 can flow out of the intake side water jacket 20 through the five top outlets 2132. The cooling medium entering the lower water jacket 11 can flow out of the intake side water jacket 20 through the side outlet 2133 and flow through the lower water jacket outlet, and enter the upper water jacket 12 through the second inlet 1214 and the third inlet respectively. The cooling medium in the upper water jacket 12 is discharged through the cooling medium outlet 1211.

[0070] The structure of the layered water jacket 10 in this embodiment will be described in detail below.

[0071] like Figure 1 and Figure 3As shown, this application provides a cylinder head water jacket 100, including: a layered water jacket 10, the layered water jacket 10 including: a lower water jacket 11 and an upper water jacket 12, the lower water jacket 11 and the upper water jacket 12 are connected, and the upper water jacket 12 forms a cooling medium outlet 1211.

[0072] Specifically, the layered water jacket 10 includes an upper water jacket 12 and a lower water jacket 11. The intake side water jacket 20 supplies cooling medium to the upper water jacket 12 through the top outlet 2132 and supplies cooling medium to the lower water jacket 11 through the side outlet 2133 (i.e., the outlet provided on the side of the intake side water jacket 20 adjacent to the lower water jacket 11). The cooling medium that has completed the cooling of the corresponding area in the lower water jacket 11 can be further supplied to the upper water jacket 12 and finally discharged from the cylinder head water jacket 100 through the cooling medium outlet 1211.

[0073] Among them, see Figure 2 As shown, the upper water jacket 12 includes a main sleeve portion 121 and a plurality of clearance sleeve portions 122 located at one end of the main sleeve portion 121. The plurality of clearance sleeve portions 122 are arranged sequentially along a first direction. The clearance sleeve portion 122 forms a valve hole 1221 for clearance of the exhaust valve. The clearance sleeve portion 122 includes a first guide area 1222, which protrudes toward the center of the valve hole 1221.

[0074] Understandably, the clearance sleeve 122 is provided with a valve hole 1221, which can be used to avoid the exhaust valve to prevent interference between the layered water jacket 10 and the exhaust valve. Furthermore, the valve hole 1221 can be arranged around the exhaust valve, allowing the cooling medium in the flow channel of the upper water jacket 12 located around the valve hole 1221 to simultaneously cool the exhaust valve. The exhaust passage can be a single-layer or multi-layer structure. The upper water jacket 12 and the lower water jacket 11 can cool the exhaust passage above and below it. Multiple clearance sleeves 122 correspond to multiple combustion chambers. For example, in a four-cylinder engine, the clearance sleeves 122... There are four of them. Each clearance sleeve 122 is provided with a first guide zone 1222. The first guide zone 1222 is formed as a protruding structure facing the center of the valve hole 1221, so that the cooling medium can be at least partially diverted to the first guide zone 1222. The first guide zone 1222 is used to divert and guide the cooling medium, thereby enhancing the cooling of the area where the valve hole 1221 is located, improving the cooling effect of the area, reducing the probability of local overheating in the valve hole 1221 area, and facilitating the control of the cooling medium flow rate, reducing the probability of local dead zones, and improving the pressure loss during the flow of the cooling medium.

[0075] Combination Figure 2As shown, the cooling medium entering the upper water jacket 12 can flow at least partially into the first guide zone 1222 extending toward the center of the valve hole 1221. This can achieve the diversion and guidance of the cooling medium, thereby enhancing the cooling of the valve hole 1221 area, optimizing the flow path of the cooling medium, reducing flow resistance, and thus reducing the pressure loss of the cooling medium in the upper water jacket 12, thereby improving the cooling effect and cooling efficiency.

[0076] It should be noted that the first direction involved in this application is the cylinder arrangement direction, which is orthogonal to the direction extending from the intake side to the exhaust side, while the direction extending from the intake side to the exhaust side corresponds to the second direction.

[0077] According to the embodiment of this application, the cylinder head water jacket 100, by providing a first guide area 1222 protruding toward the center of the valve hole 1221 on the clearance sleeve portion 122, can, on the one hand, divert the cooling medium flowing through the valve hole 1221 and further toward the main sleeve portion 121, so that more cooling medium can act on the area where the valve hole 1221 is located, thereby enhancing heat dissipation in the valve hole 1221 area, improving local thermal stress, and extending the service life of the engine. On the other hand, it can optimize the flow path of the cooling medium in the upper water jacket 12 to reduce the flow resistance of the cooling medium, thereby reducing pressure loss and improving the cooling effect and cooling efficiency.

[0078] like Figure 1 As shown, according to some embodiments of this application, the avoidance sleeve 122 includes: an end sub-sleeve 122a and an intermediate sub-sleeve 122b. The two end sub-sleeves 122a are symmetrically arranged with respect to the centerline of the layered water sleeve 10 in the first direction, and the two intermediate sub-sleeves 122b are symmetrically arranged with respect to the centerline of the layered water sleeve 10 in the first direction.

[0079] For example, the engine is a four-cylinder engine, and the corresponding clearance sleeve 122 includes two end sub-sleeves 122a and two intermediate sub-sleeves 122b. The two end sub-sleeves 122a are symmetrically arranged and have the same structure, and the two intermediate sub-sleeves 122b have the same structure.

[0080] It should be noted that the structure of the intermediate sub-sleeve 122b and the structure of the end sub-sleeve 122a may be the same or different.

[0081] In this way, by making the two end sub-sleeves 122a symmetrical and structurally identical, and the two intermediate sub-sleeves 122b symmetrical and structurally identical, the cooling medium flow rates between the two end sub-sleeves 122a and between the two intermediate sub-sleeves 122b can be made comparable. This not only facilitates the regulation of the cooling flow rates between the multiple clearance sleeves 122, but also makes the cooling efficiency and cooling effect of the multiple clearance sleeves 122 comparable, which is beneficial to inter-cylinder thermal balance, reduces the probability of local overheating, and extends the service life of the engine.

[0082] like Figure 1 As shown, according to some embodiments of this application, the main body sleeve 121 has an arc-shaped portion 1212 formed on the side facing the avoidance sleeve 122, and at least one of the two first guide areas 1222 corresponding to the same valve hole 1221 is connected to the arc-shaped portion 1212.

[0083] It is understandable that the first guide zone 1222 is connected to the arc-shaped portion 1212 of the main body sleeve 121, which can make the cooling medium flowing out of the first guide zone 1222 flow more smoothly to the main body sleeve 121, thereby reducing the generation of turbulence and improving the flow stability of the cooling medium. It can also reduce the pressure loss of the cooling medium and improve the cooling stability and reliability.

[0084] Of course, each valve hole 1221 is provided with a first guide zone 1222 on both sides in the first direction. Both first guide zones 1222 can be connected to the arc-shaped part 1212, or one can be connected to the arc-shaped part 1212 and the other can not be connected to the arc-shaped part 1212 (forming a disconnected structure), which is beneficial for regulating the flow of cooling medium.

[0085] According to some embodiments of this application, the plurality of first guide regions 1222 of the two end sub-sleeves 122a are connected to the arc-shaped portion 1212, and the first guide region 1222 of the middle sub-sleeve 122b, which is away from the centerline of the layered water jacket 10 in the first direction, is spaced apart from the arc-shaped portion 1212.

[0086] In other words, in this embodiment of the application, each clearance sleeve 122 includes two valve holes 1221, and each valve hole 1221 is provided with two first guide areas 1222 formed as protrusions. The two first guide areas 1222 corresponding to each valve hole 1221 in the end sub-sleeve 122a are connected to the arc-shaped portion 1212. In the middle sub-sleeve 122b, the first guide area 1222 of the valve hole 1221 that is far away from the center line of the first direction of the layered water jacket 10 is not connected to the arc-shaped portion 1212.

[0087] This reduces redundant flow of cooling medium in the clearance sleeve 122 corresponding to the intermediate cylinder and enhances the cooling capacity of the clearance sleeve 122 corresponding to the outer cylinder, enabling both the intermediate and outer cylinders to be cooled, achieving inter-cylinder thermal balance, and further improving the cooling stability and reliability of the cylinder head water jacket 100.

[0088] It is understandable that multiple combustion chambers are arranged sequentially along the second direction, and the combustion chamber located in the middle area is the middle cylinder, while the two combustion chambers located at both ends of the second direction are the two outer cylinders.

[0089] like Figure 1 and Figure 2 As shown, according to some embodiments of this application, the end sleeve 122a is provided with a second guide region 1223 on the side away from the centerline of the layered water jacket 10 in the first direction, and the second guide region 1223 is recessed toward the centerline of the layered water jacket 10 in the first direction.

[0090] In other words, a second flow guiding region 1223 is provided on the side of the end sub-sleeve 122a away from the middle sub-sleeve 122b in the first direction. The second flow guiding region 1223 is formed as an inward recess, so that the outer flow channel structure of the end sub-sleeve 122a is constructed as an inward recess, thereby achieving a local squeezing effect, enhancing the flow velocity of the cooling medium in the edge regions on both sides of the upper water jacket 12 in the first direction, and thus improving the cooling effect and cooling efficiency.

[0091] like Figure 1 and Figure 2 As shown, the intake-side water jacket 20 has a top outlet 2132 and a side outlet 2133. The lower water jacket 11 is connected to the side outlet 2133, and the clearance sleeve 122 has a first inlet 1225. The first inlet 1225 is connected to the top outlet 2132. The intake-side water jacket 20 supplies cooling medium to the upper water jacket 12 through the top outlet 2132 and supplies cooling medium to the lower water jacket 11 through the side outlet 2133 (i.e., the outlet provided on the side of the intake-side water jacket 20 adjacent to the lower water jacket 11). The cooling medium that has completed the cooling of the corresponding area in the lower water jacket 11 can be further supplied to the upper water jacket 12 and finally discharged from the cylinder head water jacket 100 through the cooling medium outlet 1211.

[0092] It should be noted that the multiple clearance sleeves 122 are located at one end of the main sleeve 121 adjacent to the exhaust side water jacket 20.

[0093] According to some embodiments of this application, a third guide region 1224 is formed between the two valve holes 1221 of the same clearance sleeve 122, and the end of the third guide region 1224 away from the intake side water jacket 20 is connected to the main body sleeve 121.

[0094] Therefore, some of the cooling medium can be directly supplied to the rear through the third guide zone 1224 to form a diversion and guidance of the cooling medium, thereby improving the cooling effect and efficiency of the main sleeve 121, improving temperature uniformity, avoiding excessive local temperature, and improving stability and reliability.

[0095] In summary, combining Figure 2 As shown, the cooling medium entering the upper water jacket 12 through the top outlet 2132 can achieve continuous diversion and guidance through the first guide zone 1222, the second guide zone 1223 and the third guide zone 1224.

[0096] Specifically, the upper water jacket 12 is arranged around the exhaust side, and each cylinder of the engine is provided with a first guide zone 1222. The first guide zone 1222 protrudes towards the center of the valve hole 1221 and can flow to the arc-shaped part 1212 and then converge. The first guide zone 1222 of the intermediate sub-sleeve part 122b of the intermediate cylinder is used to disconnect the arc-shaped part 1212 to realize the regulation of the cooling medium flow, reduce the redundant flow of cooling medium in the intermediate cylinder, and ensure that the outer cylinder can obtain component cooling to achieve inter-cylinder thermal balance.

[0097] In this process, after the cooling medium enters the clearance sleeve 122, it undergoes a first diversion. Part of the first diversion flows through the third guide zone 1224 and directly to the main body sleeve 121, while the other part flows around the valve hole 1221. Part of the cooling medium flowing around the valve hole 1221 flows directly to the first guide zone 1222, while the other part enters the first guide zone 1222 after passing through the second guide zone 1223, and converges within the arc-shaped portion 1212 of the main body sleeve 121, thereby guiding the cooling medium to flow in the upper layer. The cooling medium flows along a predetermined optimized path within the water jacket 12, and the flow rate and velocity of the cooling medium in the first guide zone 1222, the second guide zone 1223, and the third guide zone 1224 can be redistributed. This reduces the flow resistance of the cooling medium within the upper water jacket 12. Through the synergistic effect of the first guide zone 1222, the second guide zone 1223, and the third guide zone 1224, a diversion and guidance mechanism is formed, effectively reducing the pressure loss of the cooling medium. This results in a more uniform distribution of the cooling medium within the upper water jacket 12 and a more stable cooling effect.

[0098] In other words, the first guide zone 1222, the second guide zone 1223, and the third guide zone 1224 provided within the upper water jacket 12 can guide the cooling medium, such as Figure 2 The medium is divided into multiple streams, and the flow rate and velocity can be redistributed, thereby reducing the flow resistance of the cooling medium.

[0099] like Figure 3As shown, according to some embodiments of this application, the upper water jacket 12 is provided with a second inlet 1214 on the side away from the intake side water jacket 20, and the lower water jacket outlet of the lower water jacket 11 is connected to the second inlet 1214. The second inlet 1214 and the lower water jacket outlet are symmetrically arranged relative to the cylinder head exhaust outlet.

[0100] In this system, part of the cooling medium in the intake-side water jacket 20 enters the upper water jacket 12 through the top outlet 2132 and the first inlet 1225, and part of it enters the lower water jacket 11 through the side inlet 2112. At least part of the cooling medium in the lower water jacket 11 can enter the upper water jacket 12 through the second inlet 1214 on the exhaust side. The multiple inlets of the lower water jacket 11 are symmetrically arranged relative to the cylinder head exhaust outlet, and each inlet supplies cooling medium to the corresponding second inlet 1214, so that the cooling medium in the lower water jacket 11 can be supplied to the upper water jacket 12 more evenly.

[0101] Combination Figure 1 and Figure 2 As shown, according to some embodiments of this application, the upper water jacket 12 also has a third inlet, which is located on the main body sleeve 121 of the upper water jacket 12, between the cylinder head exhaust outlet and the clearance sleeve 122, and communicates with the lower water jacket 11.

[0102] Specifically, a protrusion 1213 is formed on the main body sleeve 121, protruding from the outer contour of the main body sleeve 121. The protrusion 1213 is disposed adjacent to the exhaust passage, and the third inlet and the overflow structure are integrated into the protrusion 1213.

[0103] In this way, the cooling medium in the lower water jacket 11 can flow into the upper water jacket 12 through the second inlet 1214 or the third inlet. The third inlet is located on the protrusion 1213, which also integrates an overflow structure and is located near the exhaust port. This can reduce the risk of thermomechanical fatigue, creep deformation or cracking of the cylinder head due to cooling failure in the exhaust port area, thereby improving the durability of the cylinder head and extending the service life of the engine.

[0104] Overall, in this embodiment of the cylinder head water jacket 100, the cooling medium enters the intake-side water jacket 20 through the intermediate inlet 2111 and the side inlet 2112. The cooling medium is then diverted and guided multiple times through the first diversion section 2122, the second diversion section 2124, the extrusion section 2123, and the first clearance hole 2121 and the second clearance hole 2131. The cooling medium flowing out of the top outlet 2132 can flow into the upper water jacket 12 through the first inlet 1225. The first guide area 1222, the second guide area 1223, the third guide area 1224, the arc-shaped section 1212, and the valve hole 1221 within the upper water jacket 12 work together to achieve the desired flow. The cooling medium in the upper water jacket 12 is diverted and guided, and the cooling medium flowing out of the side outlet 2133 can enter the lower water jacket 11. The cooling medium flowing out of the lower water jacket 11 can flow into the upper water jacket 12 through the second inlet 1214 and the third inlet, so as to reduce the pressure loss of the cylinder head water jacket 100 as a whole, improve the cooling efficiency and cooling effect of the cylinder head water jacket 100, thereby reducing the probability of cylinder head deformation and cracking; cylinder head gasket sealing failure; valve seat loosening; engine oil deterioration; increased knocking tendency; water pump overload or even damage; and the occurrence of adverse phenomena such as vapor lock and dead zone. Overall, it improves the working stability and reliability of the engine and extends the service life of the engine.

[0105] In other words, on the intake side of the cylinder head, the cooling medium is introduced through multiple intermediate inlets 2111 and side inlets 2112, with a water distribution structure designed to avoid the installation positions of spark plugs and other components. The cooling medium is diverted and guided: one part passes through a special water distribution structure (first diversion section 2122, second diversion section 2124) to reduce water flow resistance and ensure stable flow; the other part passes through a flow guiding structure (squeezing section 2123) to prioritize the flow of cooling medium to the upper water jacket connection hole (i.e., top outlet 2132) of the cylinder head, enhancing the cooling capacity of high-temperature areas while appropriately limiting flow in other areas. This differentiated cooling design effectively balances the temperature of different parts of the cylinder head, preventing localized overheating. The cooling medium flows flexibly between the upper water jacket 12 and the lower water jacket 11 through multiple inlets (second inlet 1214 and third inlet), further reducing resistance. Finally, multiple flow guiding structures (first flow guiding zone 1222, second flow guiding zone 1223, and third flow guiding zone 1224) arranged continuously within the upper water jacket 12 divide the water flow into several streams, guiding them to flow along the optimal path and redistributing the flow rate and velocity, significantly reducing water flow resistance. These designs work together to ensure stable and uniform cooling medium flow, significantly improving cooling efficiency and engine lifespan.

[0106] This application provides an engine, including the cylinder head water jacket 100 in the above embodiment. The engine in this application embodiment has higher working stability and reliability, and a longer service life.

[0107] 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.

[0108] 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 this application. 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.

[0109] Although embodiments of this application 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 this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A cylinder head water jacket, characterized in that, include: An intake-side water jacket (20) includes: a plurality of sub-water jackets (21) arranged sequentially in a first direction, each sub-water jacket (21) extending from the intake side to the exhaust side in a second direction, the first direction being orthogonal to the second direction, each sub-water jacket (21) including an intake-side water jacket portion (211), an intermediate water jacket portion (212), and an exhaust-side water jacket portion (213), the exhaust-side water jacket portion (213) forming an intake-side water jacket (20) outlet; wherein the intermediate water jacket portion (212) has a first clearance hole (2121) for avoiding spark plugs and fuel injectors, the intake-side water jacket... (20) It has lateral inlets (2112) on both sides of the centerline of the first clearance hole (2121) and a middle inlet (2111) on the centerline of the first clearance hole (2121). A first diversion part (2122) is symmetrically arranged on both sides of the centerline of the first clearance hole (2121). The first diversion part (2122) is adapted to divert the cooling medium flowing into the lateral inlet (2112) and make at least part of the cooling medium flow to the periphery of the first clearance hole (2121). The cooling medium entering the middle inlet (2111) flows directly to the periphery of the first clearance hole (2121).

2. The cylinder head water jacket according to claim 1, characterized in that, The first diversion section (2122) defines a first diversion channel on the side adjacent to the first clearance hole (2121), and the first diversion section (2122) defines a second diversion channel on the side away from the first clearance hole (2121). The cooling medium flowing in from the lateral inlet (2112) enters part of the first diversion channel and part of the second diversion channel.

3. The cylinder head water jacket according to claim 2, characterized in that, The distance between the first diverter (2122) and the first clearance hole (2121) at one end adjacent to the intake side water jacket (211) is greater than the distance between the first diverter (2122) and the first clearance hole (2121) at one end adjacent to the exhaust side water jacket (213).

4. The cylinder head water jacket according to claim 2, characterized in that, The exhaust-side water jacket (213) has a second clearance hole (2131) for avoiding the exhaust valve, and the intermediate water jacket (212) also has a second diversion section (2124), which is located between the first diversion section (2122) and the second clearance hole (2131).

5. The cylinder head water jacket according to claim 4, characterized in that, The second diverter (2124) is spaced apart from the second clearance hole (2131) so that the cooling medium flows around the second clearance hole (2131) in a clockwise or counterclockwise direction.

6. The cylinder head water jacket according to any one of claims 1-5, characterized in that, The cylinder head water jacket further includes a layered water jacket (10), which includes an upper water jacket (12) and a lower water jacket (11). The exhaust side water jacket (213) has a top outlet (2132) and a side outlet (2133). The top outlet (2132) is connected to the upper water jacket (12), and the side outlet (2133) is connected to the lower water jacket (11).

7. The cylinder head water jacket according to claim 6, characterized in that, The intermediate water jacket section (212) further includes a flow squeezing section (2123), which is located on the side of the first diversion section (2122) away from the first clearance hole (2121) and is located upstream of the top outlet (2132) and the side outlet (2133).

8. The cylinder head water jacket according to claim 7, characterized in that, The outer contour of the extrusion section (2123) is recessed toward the first clearance hole (2121).

9. The cylinder head water jacket according to claim 6, characterized in that, In the first direction, the top outlet (2132) is provided between adjacent sub-water jackets (21) and on the end edge of the sub-water jackets (21) located at the end.

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

Images