Cylinder head water jacket and engine

Abstract

This application relates to the field of engine technology, and discloses a cylinder head water jacket and an engine. The layered water jacket is located on the exhaust side of the main water jacket and is connected to the main water jacket. The upper water jacket is positioned opposite the upper exhaust passage, and the lower water jacket is positioned opposite the lower exhaust passage. The intermediate water jacket is located between the upper and lower exhaust passages and connects the upper and lower water jackets. A partial water jacket is located on the side of the intermediate water jacket adjacent to the main water jacket and near the exhaust port of the exhaust passage. One end of the partial water jacket is connected to the upper water jacket, and the other end is connected to the intermediate water jacket. Therefore, on the one hand, the initial temperature of the cooling medium can be reduced to improve the cooling effect; on the other hand, the probability of localized overheating at the exhaust port can be reduced, the probability of cylinder head cracking at the exhaust port can be reduced, the service life of the cylinder head can be extended, and the cooling effect can be improved, thereby enhancing the reliability and stability of the engine.

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] In related technologies, when an engine is running, the combustion in the cylinder generates a lot of heat. In order to avoid the cylinder head overheating and affect the engine's economy and power, a cylinder head water jacket needs to be installed inside the cylinder head for coolant circulation in order to cool and reduce the temperature of the cylinder head.

[0003] However, existing cylinder head water jackets have low cooling efficiency, which can easily lead to increased thermal load on the cylinder head and may even cause cylinder head cracking and other malfunctions. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a cylinder head water jacket that has high cooling efficiency and good cooling effect, which can reduce cylinder head cracking, improve cylinder head service life, and enhance engine operating stability and reliability.

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

[0006] In a first aspect, this application provides a cylinder head water jacket, which is disposed on the cylinder head and includes: a main water jacket and a layered water jacket, wherein the layered water jacket is located on the exhaust side of the main water jacket and is in communication with the main water jacket; wherein

[0007] The layered water jacket includes an upper water jacket, an intermediate water jacket, a lower water jacket, and a partial water jacket. The upper water jacket is disposed opposite to the upper exhaust channel, and the lower water jacket is disposed opposite to the lower exhaust channel. The intermediate water jacket is located between the upper exhaust channel and the lower exhaust channel and is used to connect the upper water jacket and the lower water jacket. The partial water jacket is located on the side of the intermediate water jacket adjacent to the main water jacket and is disposed near the exhaust branch of the exhaust channel. One end of the partial water jacket is connected to the upper water jacket, and the other end is connected to the intermediate water jacket.

[0008] According to the embodiments of this application, the cylinder head water jacket introduces cooling medium through the intake side and sets up a local water jacket. On the one hand, it can reduce the initial temperature of the cooling medium to improve the cooling effect. On the other hand, the local water jacket can further increase the flow velocity of the cooling medium and increase the coverage area of ​​the layered water jacket, so as to achieve targeted cooling of the exhaust port (the part where adjacent exhaust passages merge), reduce the probability of local overheating at the exhaust port position or area, improve the cooling effect, reduce the probability of cylinder head cracking at the exhaust port position or area, extend the service life of the cylinder head, and improve the cooling effect, thereby improving the reliability and stability of the engine.

[0009] According to some embodiments of this application, the local water jacket includes: a main stream sleeve and two branch stream sleeves located downstream of the main stream sleeve. The main stream sleeve is connected to the upper water jacket. The two branch stream sleeves are far from the main stream sleeve and extend away from each other, and both branch stream sleeves point towards the intermediate water jacket.

[0010] According to some embodiments of this application, the main sleeve includes at least one tapering section in the cooling medium flow direction where the upstream and downstream flow areas are smaller than the upstream flow areas.

[0011] According to some embodiments of this application, the tapering section includes: a first tapering section and a second tapering section arranged sequentially in the cooling medium flow direction, wherein the flow area at the inlet end of the first tapering section is greater than the flow area at the inlet end of the second tapering section, and the flow area at the inlet end of the second tapering section is greater than the flow area at the outlet section of the first tapering section.

[0012] According to some embodiments of this application, the minimum flow diameter of the first tapering section is a, the maximum flow diameter of the second tapering section is b, and the maximum flow diameter of the first tapering section is c, and satisfy 1.2≤b / a≤1.3, 2≤c / a.

[0013] According to some embodiments of this application, the length of the first tapered segment is L1, and a tapered segment is provided between the second tapered segment and the first tapered segment. The length of the tapered segment is L2, and the length of the second tapered segment is L3, and they satisfy 0.25≤L3 / L1≤0.3 and 0.13≤L2 / L3≤0.18.

[0014] According to some embodiments of this application, the branch sleeve is connected laterally to the second tapered section, and the end of the second tapered section is formed into a pointed corner.

[0015] According to some embodiments of this application, the tributary sleeve extends obliquely relative to the horizontal plane to communicate with the intermediate water jacket, and the tributary sleeve is formed at least in the sand-clearing hole of the intermediate water jacket, and further perforated to communicate with the partial water jacket.

[0016] According to some embodiments of this application, the angle between the branch sleeve and the horizontal plane is 40°-50°.

[0017] Secondly, this application provides an engine, including: the cylinder head water jacket described in the above embodiments.

[0018] 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

[0019] 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:

[0020] Figure 1 This is a top view of the cylinder head water jacket according to an embodiment of this application;

[0021] Figure 2 This is a bottom view of the cylinder head water jacket according to an embodiment of this application;

[0022] Figure 3 This is a side view of the cylinder head water jacket according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of a layered water jacket according to an embodiment of this application;

[0024] Figure 5 This is a partial schematic diagram of a layered water jacket according to an embodiment of this application;

[0025] Figure 6 This is a partial schematic diagram of a partial water jacket according to an embodiment of this application;

[0026] Figure 7 This is a partial cross-sectional schematic diagram of a layered water jacket according to an embodiment of this application;

[0027] Figure 8 This is a partial schematic diagram of the intermediate water jacket according to an embodiment of this application;

[0028] Figure 9 This is a schematic diagram of the lower water jacket according to an embodiment of this application (straight pipe not shown).

[0029] Figure label:

[0030] Cylinder head water jacket 100,

[0031] Main water jacket 10, intake side sub-water jacket 11, intermediate sub-water jacket 12, first clearance part 121, first guide hole 122, first squeezing hole 123, exhaust side water jacket 13.

[0032] Layered water jacket 20, upper water jacket 21, upper water jacket inlet 211, second clearance section 212, first guide wall 213, crossflow rib 214, second guide hole 215, upper water jacket outlet 216, second squeezing hole 217, middle water jacket 22, middle water jacket inlet 221, middle water jacket outlet 222, first water jacket block 223, second water jacket block 224, middle water jacket body 225, inclined area 226, lower water jacket 23, lower water... The system includes: inlet 231, lower water jacket outlet 232, first outlet 2321, end outlet 23211, middle outlet 23212, straight pipe 2322, second outlet 23221, second guide wall 2323, protrusion 2324, concave arc 2325, partial water jacket 24, main stream jacket 241, first tapering section 2411, expanding section 2412, second tapering section 2413, sharp corner 2414, and tributary jacket 242. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] In this application, "multiple" means two or more (including two).

[0043] It should be noted that an engine includes a cylinder block and a cylinder head, and 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 are connected. The exhaust manifold, intake manifold, etc. are integrated on the end cover and form the intake and exhaust passages on the cylinder head. The cylinder head water jacket is set on the end cover and can achieve overall cooling of the intake passage, exhaust passage and cylinder head.

[0044] In related technologies, the engine cooling system first cools the cylinder block, and then the cooling medium drawn from the cylinder block is led out through the cylinder head gasket area to the cylinder head water jacket for cooling the cylinder head. However, in related technologies, the cooling medium is introduced into the cylinder head water jacket from the exhaust side. The temperature on the exhaust side (where combustion exhaust gases are discharged) is relatively high. As a result, the initial temperature of the cooling medium in the cylinder head water jacket is relatively high during the process of the cooling medium flowing from the exhaust side to the intake side to achieve overall cooling of the cylinder head. This leads to a decrease in the cooling effect of the cylinder head water jacket on the cylinder head, an increase in the thermal load on the cylinder head, and a higher risk and probability of cracking.

[0045] Based on this, this application proposes a cylinder head water jacket. In the embodiment of this application, the main water jacket introduces the cooling medium from the cylinder block water jacket, and the layered water jacket is disposed on the exhaust side of the main water jacket. The main water jacket introduces the cooling medium from the intake side sub-water jacket, and the exhaust side sub-water jacket supplies the cooling medium to the layered water jacket, so that the flow direction of the cooling medium is from the intake side to the exhaust side. The temperature on the intake side is lower, while the temperature on the exhaust side is higher. Introducing the cooling medium from the intake side can reduce the initial temperature of the cooling medium, so that the temperature difference between the initial temperature of the cooling medium and the cylinder head is greater, so as to better cool the cylinder head and other components disposed on the cylinder head, reduce the risk of cylinder head cracking, extend the service life of the cylinder head, and improve the working stability and reliability of the engine.

[0046] The following is for reference. Figures 1-9 The present invention describes a cylinder head water jacket 100 and an engine according to an embodiment of the present invention.

[0047] like Figure 1 and Figure 2 As shown, this application provides a cylinder head water jacket 100, which is disposed on the cylinder head and includes: a main water jacket 10 and a layered water jacket 20. The layered water jacket 20 is located on the exhaust side of the main water jacket 10 and is connected to the main water jacket 10.

[0048] 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 equipped with the exhaust manifold and the intake manifold. The side of the main water jacket 10 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 20 located on the exhaust side of the main water jacket 10. The main water jacket 10 can be supplied to the layered water jacket 20 through the exhaust side sub-water jacket 13 located on the exhaust side.

[0049] Therefore, the cooling medium can be introduced from the relatively low-temperature intake side to reduce the initial problems of the cooling medium. The cooling medium with a lower initial temperature has a better cooling effect on the cylinder head, and the probability of the cylinder head cracking is lower.

[0050] Combination Figure 1 , Figure 2 and Figure 3 As shown, according to some embodiments of this application, the layered water jacket 20 includes: an upper water jacket 21, an intermediate water jacket 22, and a lower water jacket 23. The upper water jacket 21 is disposed opposite to the upper exhaust passage, and the lower water jacket 23 is disposed opposite to the lower exhaust passage. The intermediate water jacket 22 is located between the upper exhaust passage and the lower exhaust passage and is used to connect the upper water jacket 21 and the lower water jacket 23. The upper water jacket 21 has a plurality of upper water jacket inlets 211 that communicate with the exhaust side sub-water jacket 13. The lower water jacket 23 has a plurality of lower water jacket outlets 232 for discharging the cooling medium. The upper water jacket inlets 211 and the lower water jacket outlets 232 are staggered relative to the crankshaft centerline of the engine.

[0051] Specifically, the cylinder head has an upper exhaust passage and a lower exhaust passage that are opposite each other in the height direction. The area where the upper and lower exhaust passages meet forms an exhaust branch. The layered water jacket 20 is fitted on the outside of the upper and lower exhaust passages. The upper water jacket 21 is opposite to the upper exhaust passage, and the lower water jacket 23 is opposite to the lower exhaust passage. The intermediate water jacket 22 is located between the upper water jacket 21 and the lower water jacket 23 and is adjacent to the exhaust branch. The upper water jacket 21 cools the upper exhaust passage, and the lower water jacket 23 cools the lower exhaust passage. The intermediate water jacket 22 can specifically enhance the cooling of the exhaust branch area to reduce the probability of cracking in the area of ​​the cylinder head that defines the exhaust passage, thereby improving stability and reliability.

[0052] 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.

[0053] Understandably, the upper water jacket 21 has an upper water jacket inlet 211 and an upper water jacket outlet 216; the intermediate water jacket 22 has an intermediate water jacket inlet 221 and an intermediate water jacket outlet 222; and the lower water jacket 23 has a lower water jacket inlet 231 and a lower water jacket outlet 232. The upper water jacket inlet 211 is connected to the exhaust-side water jacket to introduce cooling medium from the cylinder head nose area into the upper water jacket 21. The upper water jacket outlet 216 is connected to the intermediate water jacket inlet 221. The intermediate water jacket outlet 222 is connected to the lower water jacket inlet 231, that is, the upper end of the intermediate water jacket 22 has an intermediate water jacket inlet 221, the intermediate water jacket inlet 221 is connected to the upper water jacket 21, the lower end of the intermediate water jacket 22 has an intermediate water jacket outlet 222, the intermediate water jacket outlet 222 is connected to the lower water jacket inlet 231 of the lower water jacket 23, and the lower water jacket outlet 232 is used to discharge the cooling medium, such as to discharge it to the cylinder water jacket, so as to form a complete cooling medium circulation path.

[0054] Furthermore, the upper water jacket inlet 211 is constructed in multiple ways, and the multiple upper water jacket inlets 211 are spaced apart along the crankshaft axis of the engine. The multiple lower water jacket outlets 232 are spaced apart along the crankshaft axis of the engine. The upper water jacket inlets 211 and the lower water jacket outlets 232 are staggered relative to the crankshaft centerline. This allows the layered water jacket 20 to cover a larger area. The staggered paths of the cooling medium entering and exiting reduce the temperature impact of the higher-temperature outflow cooling medium on the inflow cooling medium, thereby enhancing the heat exchange and cooling effect.

[0055] like Figure 4 and Figure 5 As shown, the layered water jacket 20 also includes a partial water jacket 24, which is located on the side of the intermediate water jacket 22 adjacent to the main water jacket 10 and is set near the exhaust port of the exhaust channel. One end of the partial water jacket 24 is connected to the upper water jacket 21 and the other end is connected to the intermediate water jacket 22.

[0056] Specifically, a local water jacket 24 is further provided between the upper water jacket 21 and the lower water jacket 23. The local water jacket 24 can form a branch flow path to guide the cooling medium from the upper water jacket 21 to the middle water jacket 22. The local water jacket 24 is located near the exhaust port so that the cooling medium flowing in the local water jacket 24 can achieve enhanced cooling of the exhaust port or area.

[0057] According to the cylinder head water jacket 100 of this application embodiment, a cooling medium is introduced through the intake side, and a local water jacket 24 is provided. On the one hand, the initial temperature of the cooling medium can be reduced to improve the cooling effect. On the other hand, the local water jacket 24 can further increase the flow velocity of the cooling medium and increase the coverage area of ​​the layered water jacket 20, so as to achieve targeted cooling of the exhaust port (the part where adjacent exhaust passages merge), reduce the probability of local overheating at the exhaust port position or area, improve the cooling effect, reduce the probability of cylinder head cracking at the exhaust port position or area, extend the service life of the cylinder head, and improve the cooling effect, thereby improving the reliability and stability of the engine.

[0058] like Figure 5 As shown, according to some embodiments of this application, the local water jacket 24 includes: a main stream jacket 241 and two branch jackets 242 located downstream of the main stream jacket 241. The main stream jacket 241 is connected to the upper water jacket 21. The two branch jackets 242 are away from the main stream jacket 241 and extend away from each other, and both branch jackets 242 point towards the middle water jacket 22.

[0059] Specifically, one end of the main stream sleeve 241 is connected to the upper water sleeve 21, and the other end of the main stream sleeve 241 is connected to two branch sleeves 242. The branch sleeves 242 are connected to the middle water sleeve 22 (i.e., can extend toward the exhaust duct), and the branch sleeves 242 are connected to the middle water sleeve 22.

[0060] In this way, by setting the main flow sleeve 241 and the branch flow sleeve 242, the exhaust port area can be compensated for and cooled, avoiding the absence of a water jacket structure in this area. This prevents the exhaust port area and the exhaust passage area adjacent to the exhaust port from getting too hot, and can also achieve targeted cooling of the exhaust passage area adjacent to the exhaust port, so as to improve the cooling and heat conduction effect around the exhaust passage, thereby improving the overall cooling effect of the cylinder head water jacket 100 on the cylinder head.

[0061] Combination Figure 5 and Figure 6 As shown, according to some embodiments of this application, the main sleeve 241 includes at least one tapering section in the cooling medium flow direction, where the downstream flow area is smaller than the upstream flow area.

[0062] It should be noted that the outer contour of the tapered section can be conical, so that the flow velocity of the cooling medium flowing into the mainstream sleeve 241 gradually increases as it flows out of the mainstream sleeve 241, thereby enhancing heat exchange and improving the cooling effect.

[0063] In other words, by setting up a tapered section, as the cooling medium flows through the tapered section, the flow area of ​​the tapered section gradually decreases, which can gradually increase the flow velocity of the cooling medium to carry away more heat. At the same time, the thickness of the cylinder head around the tapered section will also increase accordingly, thereby improving the fatigue strength of the cylinder head. That is, while increasing the flow velocity, the thickness of the cylinder head in this area can be increased to take into account the fatigue strength of the cylinder head and further reduce the probability of the cylinder head cracking in the area where the tapered section is located.

[0064] In addition, the increased flow rate of the cooling medium in the converging section can also allow the cooling medium to flow towards the middle water jacket at a higher flow rate, and the stronger flow component of the cooling medium flowing through the branch jacket 242 can specifically improve the cooling effect on the exhaust port area.

[0065] like Figure 6 As shown, according to some embodiments of this application, the tapering section includes: a first tapering section 2411 and a second tapering section 2413 arranged sequentially in the cooling medium flow direction, wherein the flow area at the inlet end of the first tapering section 2411 is greater than the flow area at the inlet end of the second tapering section 2413, and the flow area at the inlet end of the second tapering section 2413 is greater than the flow area at the outlet section of the first tapering section 2411.

[0066] Specifically, the connecting region between the first narrowing section 2411 and the second narrowing section 2413 forms a widening section 2412. The flow area at the end of the widening section 2412 connected to the first narrowing section 2411 is the same as the flow area at the outflow end of the first narrowing section 2411. The flow area at the end of the widening section 2412 connected to the second narrowing section 2413 is the same as the flow area at the inflow end of the second narrowing section 2413. Overall, the flow area at the inflow end of the first narrowing section 2411 is the largest, followed by the flow area at the inflow end of the second narrowing section 2413, and then the flow area at the outflow end of the first narrowing section 2411. The flow area at the outflow end of the second narrowing section 2413 is the smallest (the total flow area at the inflow ends of the two branch sleeves 242).

[0067] In this way, the cooling medium flows through the first converging section 2411, the expanding section 2412, and the second converging section 2413 in sequence. After the cooling medium flows through the first converging section 2411, the transient flow velocity has been increased to a certain extent. Furthermore, the expanding section 2412 is set downstream of the first converging section 2411 so that the flow area is slightly larger than the outflow end of the first converging section 2411, in order to meet the flow requirements for diverting the flow to the two branch sleeves 242.

[0068] The minimum flow diameter of the first tapering section 2411 is a, the maximum flow diameter of the second tapering section 2413 is b, and the maximum flow diameter of the first tapering section 2411 is c, and they satisfy 1.2≤b / a≤1.3, 2≤c / a.

[0069] Specifically, to achieve the effect of increased cooling medium velocity during the supply of cooling medium from the main flow sleeve 241 to the branch flow sleeve 242, a first tapering section 2411 and a second tapering section 2413 are provided on the main flow sleeve 241. The maximum flow area of ​​the first tapering section 2411 can be more than twice the minimum flow area to improve the velocity increase effect. At the same time, the minimum flow diameter of the first tapering section 2411 and the maximum flow diameter of the second tapering section 2413 satisfy the above-mentioned proportional relationship, which can limit the overall structure of the expanding section 2412. Furthermore, through the design of the expanding section 2412, the expansion section 24 can be avoided. The cross-sectional area of ​​section 12 is too small to ensure sufficient flow of cooling medium to the two branch sleeves 242, thereby avoiding an excessively large cross-sectional area of ​​the expanding section 2412. This prevents sudden changes in the flow rate of the cooling medium, i.e., avoids a sudden drop in flow rate after the cooling medium flows into the expanding section 2412, thus reducing heat accumulation. Furthermore, avoiding an excessively large cross-sectional area of ​​the expanding section 2412 allows for a more reasonable local thickness setting in the corresponding area of ​​the cylinder head, preventing a reduction in the local thickness of the cylinder head. This reduces the decrease in the cylinder head safety factor under the combined effects of thermal load and the fatigue strength of the cylinder head itself, thus balancing the structural strength of the cylinder head.

[0070] At the same time, making the cross-sectional area of ​​the expanding section 2412 more reasonable is also beneficial to the local design of the exhaust passage on the cylinder head. When the cross-sectional area of ​​the expanding section 2412 is too large, the thickness of the local water jacket 24 needs to be increased accordingly, which will cause the exhaust passage structure in this area to be reduced accordingly, and will also reduce the flow coefficient of the exhaust passage, affecting the overall performance of the engine. However, the cross-sectional area of ​​the expanding section 2412 is more reasonable, so the exhaust passage does not need to be reduced in size, and the overall performance of the engine can be further taken into account.

[0071] like Figure 6 As shown, according to some embodiments of this application, the length of the first tapered segment 2411 is L1, and a tapered segment 2412 is provided between the second tapered segment 2413 and the first tapered segment 2411. The length of the tapered segment 2412 is L2, and the length of the second tapered segment 2413 is L3, and the following conditions are met: 0.25≤L3 / L1≤0.3, 0.13≤L2 / L3≤0.18.

[0072] In this way, the length dimensions of the first tapering section 2411, the second tapering section 2413, and the expanding section 2412 are more reasonable. The first tapering section 2411, with its more reasonable length dimensions, can better increase the flow rate of the cooling medium. The expanding section 2412, with its more reasonable length dimensions, can effectively avoid sudden changes in the flow rate of the cooling medium while ensuring a reasonable flow rate of the cooling medium supplied to the branch sleeve 242, thus ensuring a stable increase in flow rate. The setting of the second tapering section 2413, with its more reasonable length dimensions, can further increase the flow rate of the cooling medium while also reducing the difficulty of connecting the branch sleeve 242 and the main sleeve 241, reducing the difficulty of setting up the branch sleeve 242, and reducing the processing difficulty of the local water jacket 24.

[0073] Combination Figure 5 and Figure 6 As shown, according to some embodiments of this application, the branch sleeve 242 is connected laterally to the second tapered section 2413, and the end of the second tapered section 2413 is formed into a pointed corner 2414.

[0074] In other words, the end of the local water jacket 24 near the exhaust side is closed, and the end portion can be formed as a pointed corner 2414, that is, the cross-sectional area of ​​the end gradually increases in the direction away from the exhaust side.

[0075] Therefore, by setting the sharp corner 2414, not only can the flow rate of the cooling medium be further increased, but the cooling medium can also be better diverted to the two branch sleeves 242 to achieve the technical purpose of cooling the exhaust passage and exhaust port.

[0076] According to some embodiments of this application, the branch sleeve 242 extends obliquely relative to the horizontal plane to communicate with the intermediate water sleeve 22, and the branch sleeve 242 has at least a sand-clearing hole formed in the intermediate water sleeve 22, and is further perforated to communicate with the partial water sleeve 24.

[0077] Specifically, the intermediate water jacket 22 and the local water jacket 24 are connected by drilling sand-clearing holes, and the drilling angle is 40°-50°, that is, the branch sleeve 242 forms an angle of 40°-50° with the horizontal plane.

[0078] In this way, on the one hand, the end of the branch sleeve 242 connected to the main sleeve 241 can be closer to the sharp corner 2414, so as to avoid the area where the sharp corner 2414 is located becoming a dead zone, affecting heat dissipation, and can increase the flow of the cooling medium, further improving the heat dissipation effect on the exhaust passage on the cylinder head, reducing the probability of failure, especially the probability of cylinder head cracking. On the other hand, it can avoid directly connecting the intermediate water jacket 22 at the sharp corner 2414, and can reduce the change in cross-sectional area of ​​the second tapering section 2413, thereby reducing the heat load.

[0079] In summary, after the cooling medium flows to the upper water jacket 21, it can be divided into a first path and a second path. Both the first and second paths of cooling medium can be split and merged multiple times under the action of the first clearance part 121, the second clearance part 212, the crossflow rib 214, the first guide hole 122, and the second guide hole 215. Finally, the first path of cooling medium flows to the middle water jacket 22 through the upper water jacket outlet 216, and the second path of cooling medium enters the main stream sleeve 241 of the local water jacket 24 and flows to the middle water jacket 22 through the branch sleeve 242. The first tapering section 2411, the expanding section 2412, the second tapering section 2413, and the sharp corner 2414 on the main stream sleeve 241 ensure that the flow rate and flow volume of the second path of cooling medium flowing out through the branch sleeve 242 can meet the requirements, thereby improving the cooling effect on the exhaust port and exhaust passage.

[0080] The structure of the main water jacket 10 in the embodiments of this application will now be described in detail.

[0081] The main water jacket 10 includes: an intake side sub-water jacket 11 arranged around the intake passage, an intermediate sub-water jacket 12 connected to the intake side sub-water jacket 11, and an exhaust side water jacket 13. The exhaust side water jacket 13 is located in the cylinder head nose area and is arranged around the exhaust port and connected to the layered water jacket 20.

[0082] Specifically, in terms of the flow direction of the cooling medium, the main water jacket 10 includes: an intake-side sub-water jacket 11, an intermediate sub-water jacket 12, and an exhaust-side sub-water jacket 13. The cylinder block water jacket supplies the cooling medium from the cylinder head gasket area to the intake-side sub-water jacket 11. The intake-side sub-water jacket 11 is arranged around the intake passage so that the cooling medium can flow through the intake passage and then further flow to the intermediate sub-water jacket 12, and be supplied to the exhaust-side water jacket 13 through the intermediate sub-water jacket 12. The exhaust-side water jacket 13 is located in the cylinder head nose area and can supply the cooling medium to the layered water jacket 20 in the cylinder head nose area, so that the cooling medium flows from the intake side of the main water jacket 10 to the exhaust side of the main water jacket 10, and is supplied to the layered water jacket 20 from the exhaust side of the main water jacket 10, and can achieve enhanced heat dissipation and cooling of the cylinder head nose area.

[0083] It is understood that in this embodiment, the main water jacket 10 introduces the cooling medium through the intake side sub-water jacket 11 adjacent to the intake manifold and intake port, and discharges the cooling medium to the stratified water jacket 20 through the exhaust side sub-water jacket 13. The introduction of the cooling medium from the intake side, which has a relatively lower temperature, can reduce the initial temperature of the cooling medium flowing into the cylinder head water jacket 100. The flow of the cooling medium with a lower initial temperature can improve the cooling effect and efficiency of the cylinder head water jacket 100, thereby improving the cooling effect on the components installed on the cylinder head and the cylinder head itself, thus reducing the thermal load on the cylinder head and reducing the probability of the cylinder head cracking. At the same time, for the cylinder head bridge area where heat is prone to accumulate, targeted heat dissipation can be enhanced, which can further improve the cooling effect and reduce the probability of the cylinder head cracking.

[0084] According to the cylinder head water jacket 100 of this application embodiment, by introducing a cooling medium into the intake side sub-water jacket 11 of the main water jacket 10, and allowing the cooling medium to be supplied to the layered water jacket 20 through the exhaust side sub-water jacket 13 located in the cylinder head bridge area, on the one hand, the cooling medium flows from the intake side to the exhaust side, and the initial temperature of the cooling medium can be lower, thereby improving the cooling effect and cooling efficiency, and reducing the probability of cylinder head cracking. On the other hand, it can achieve enhanced heat dissipation in the cylinder head bridge area, and can further reduce the probability of cylinder head cracking, thereby increasing the service life of the cylinder head, reducing the probability of local overheating, and thus improving the working reliability and safety of the engine.

[0085] 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.

[0086] Combination Figure 1 and Figure 2 As shown, according to some embodiments of this application, the intermediate sub-water jacket 12 has a first clearance portion 121 arranged around the spark plug hole and the injector hole, and the intermediate sub-water jacket 12 has a first guide hole 122 located on both sides of the first clearance portion 121 in the engine axial direction.

[0087] Specifically, the intermediate sub-water jacket 12 is located between the exhaust-side sub-water jacket 13 and the intake-side sub-water jacket 11. In the extending direction of the intermediate sub-water jacket 12, spark plug holes and fuel injector holes are formed on the cylinder head. The spark plug and fuel injector pass through the spark plug holes and fuel injector holes respectively, extending into the cylinder block to perform ignition actions during engine operation, thereby igniting the fuel mixture in the cylinder and performing fuel injection to add fuel to the cylinder. Correspondingly, a first clearance portion 121 is provided on the intermediate sub-water jacket 12. The first clearance portion 121 is constructed as an intermediate sub-water jacket... The clearance holes on the water jacket 12 define the flow space inside the intermediate sub-water jacket 12, while the first clearance part 121 on the outer side not only avoids the spark plug and fuel injector, but can also be arranged around the spark plug and fuel injector so that the cooling medium can exchange heat with the spark plug and fuel injector around the spark plug and fuel injector as it flows through the intermediate sub-water jacket 12, thereby reducing the temperature of the spark plug and fuel injector, reducing the probability of spark plug and fuel injector failure due to excessive temperature, and improving the working stability and reliability of spark plug and fuel injector.

[0088] Therefore, by setting the first clearance part 121 and the first guide hole 122, on the one hand, the flow area inside the intermediate sub-water jacket 12 can be reduced, so as to accelerate the flow rate of the cooling medium inside the intermediate sub-water jacket 12 through the change of flow area. On the other hand, the first guide hole 122 can allow more cooling medium to flow around the spark plug and injector, thereby achieving effective and reliable cooling of the spark plug and injector, and improving the working stability and reliability of the spark plug and injector, thereby improving the working stability and reliability of the engine.

[0089] like Figure 1 and Figure 2 As shown, according to some embodiments of this application, the two first guide holes 122 corresponding to the same first clearance portion 121 are both disposed away from the first clearance portion 121 in the direction extending toward the air intake side of the main body water jacket 10.

[0090] In other words, there are multiple sets of first guide holes 122, with two first guide holes 122 in each set, and each set of two first guide holes 122 corresponds to a first clearance part 121. The first guide holes 122 are constructed as elliptical holes, and the first guide holes 122 extend from the air intake side of the main water jacket 10 toward the exhaust side. The distance between the ends of the two first guide holes 122 adjacent to the air intake side is greater than the distance between the ends adjacent to the exhaust side. In order to improve the guiding effect of the first guide holes 122 in the flow direction, more cooling medium can flow through the first clearance part 121 during the process of flowing through the intermediate sub-water jacket 12, so as to improve the cooling effect on the spark plug and the fuel injector.

[0091] See Figure 1 and Figure 2As shown, according to some embodiments of this application, the intermediate sub-water jacket 12 further includes: a first squeezing hole 123, the first squeezing hole 123 being located at the end of the first guide hole 122 away from the first avoidance part 121, and the two are spaced apart.

[0092] Specifically, the first squeezing hole 123 is located at one end of the first guide hole 122 near the intake side, and the first squeezing hole 123 is constructed as an arc-shaped recess on the outer contour of the intermediate sub-water jacket 12 facing the first relief part 121 to generate a squeezing effect. On the one hand, it can increase the flow speed of the cooling medium through the intermediate sub-water jacket 12 to improve the cooling effect. On the other hand, it can make more cooling medium flow towards the first relief part 121 to increase the amount of cooling medium flowing through the injector and spark plug, thereby achieving enhanced cooling of the injector and spark plug.

[0093] In summary, as Figure 3 As shown, in this embodiment, the cooling medium flow path of the main water jacket 10 is as follows: the cooling medium is led out from the cylinder block water jacket to the intake side sub-water jacket 11. The cooling medium in the intake side main water jacket can flow through the intake passage and flow to the intermediate sub-water jacket 12. The cooling medium in the intermediate sub-water jacket 12 can flow through the first relief part 121 used to avoid the fuel injector and spark plug under the combined squeezing and guiding action of the first squeezing hole 123 and the first guide hole 122, and then flow to the exhaust side sub-water jacket 13. 13 is located in the cylinder head nose area and can flow through the cylinder head nose area to the layered water jacket 20, so that the cooling medium flows from the intake side of the main water jacket 10 to the exhaust side of the main water jacket 10, and cools the intake manifold through the intake side sub-water jacket 11, cools the fuel injector and spark plug through the intermediate sub-water jacket 12, and cools the cylinder head nose area through the exhaust side sub-water jacket 13, so as to improve the cooling effect, reduce the probability of cylinder head cracking, reduce the thermal load of cylinder head, extend the service life of cylinder head, and improve the working stability and reliability of engine.

[0094] The structure of the upper water jacket 21 in the embodiments of this application will now be described in detail.

[0095] like Figure 4 As shown, according to some embodiments of this application, the upper water jacket 21 has a second clearance portion 212 arranged around the exhaust duct and a first guide wall 213, a crossflow rib 214, a second guide hole 215 and an upper water jacket outlet 216 arranged sequentially downstream of the second clearance portion 212. The upper water jacket outlet 216 is connected to the middle water jacket 22.

[0096] Specifically, the second clearance portion 212 is constructed as a clearance hole formed on the outer contour of the upper water jacket 21. The second clearance portion 212 can avoid the exhaust pipe, and the cooling medium flowing through the second clearance portion 212 can cool and lower the temperature of the exhaust pipe. Downstream of the second clearance portion 212, a first guide wall 213 can be provided. The first guide wall 213 is used to guide the cooling medium to the cross flow rib 214. The cross flow rib 214 and the second guide hole 215 can cooperate to guide the cooling medium to multiple upper water jacket outlets 216, so that the amount of cooling medium received by multiple upper water jacket outlets 216 is more uniform, thereby improving the cooling uniformity and avoiding local overheating.

[0097] Among them, the crossflow rib 214 can extend along the axial direction of the engine, and there are multiple second guide holes 215, all of which are located downstream of the crossflow rib 214, so as to achieve uniform flow to multiple upper water jacket outlets 216.

[0098] Combination Figure 2 and Figure 9 As shown, according to some embodiments of this application, a plurality of lower water jacket outlets 232 are provided on the side of the lower water jacket 23 adjacent to the main water jacket 10. The lower water jacket outlets 232 include: a first outlet 2321 and a second outlet 23221. A second guide wall 2323 is provided between the first outlet 2321 located at the end of the lower water jacket 23 and the first outlet 2321 adjacent to it. A straight pipe 2322 is also provided on the lower water jacket 23. One end of the straight pipe 2322 is connected to the lower water jacket 23, and the other end of the straight pipe 2322 forms the second outlet 23221.

[0099] Specifically, the lower water jacket 23 has multiple lower water jacket outlets 232 on the side adjacent to the main water jacket 10, and multiple lower water jacket inlets 231 on the side away from the main water jacket 10. The multiple lower water jacket outlets 232 include: end outlets 23211 located at the axial end of the lower water jacket 23, and one or more intermediate outlets 23212 formed between two end outlets 23211. Both the end outlets 23211 and the intermediate outlets 23212 are used to discharge the cooling medium. At the same time, the second outlet 23221 formed on the straight pipe 2322 is also used to discharge the cooling medium. In this way, the number of lower water jacket outlets 232 can be increased to improve the cooling medium discharge efficiency. The higher discharge efficiency allows more cooling medium to enter the layered water jacket 20 per unit time, which can increase the cooling medium flow rate and improve the cooling efficiency and cooling effect.

[0100] Furthermore, such as Figure 2 and 9 As shown, the downward orthographic projection profile of the second outlet 23221 is located inside the orthographic projection profile of the upper water jacket inlet 211 of the upper water jacket 21.

[0101] In other words, the second outlet 23221 is located closer to the cylinder center perpendicular to the crankshaft direction than the upper water jacket inlet 211 at the end of the cylinder head.

[0102] This allows the cooling medium to form a more reasonable flow path within the layered water jacket 20, ensuring that the cooling medium can cover a larger area of ​​the cylinder head region. This not only avoids the formation of cooling dead zones and ensures sufficient cooling of the cylinder head, but also allows the cooling medium flow to gradually converge during the process of flowing into and out of the layered water jacket 20, ensuring stable flow and improving the cooling effect.

[0103] like Figure 2 As shown, according to some embodiments of this application, the straight pipe 2322 is disposed adjacent to a first outlet 2321 located at the end of the lower water jacket 23, and the distance between the two is 30mm-50mm.

[0104] In other words, the straight pipe 2322 is located near the end outlet 23211, and the distance between the straight pipe 2322 and the end outlet 23211 is 30mm-50mm. For example, the distance is 30mm, 40mm, 50mm, etc.

[0105] In this way, on the one hand, by setting the straight pipe 2322, the pressure loss during the discharge of cooling medium from the layered water jacket 20 can be reduced, so as to avoid the cooling efficiency of the layered water jacket 20 decreasing due to excessive pressure loss, thereby keeping the cooling effect stable. On the other hand, it can avoid the distance between the second outlet 23221 and the first outlet 2321 being too close, so as to improve the flow interception and improve the uniform heat dissipation of the cylinder head and cylinder block.

[0106] In addition, by setting up a straight pipe 2322, the straight pipe 2322 can occupy a part of the cylinder head space. During the cylinder head processing, this part of the space can be formed into a clearance area for installing the straight pipe 2322. The material cost and weight of the straight pipe 2322 are much lower than those of the cylinder head material, which can also reduce the weight of the cylinder head and reduce the processing cost of the cylinder head.

[0107] It should be pointed out that, as Figure 2 and Figure 9As shown, a protrusion 2324 is provided on the side of the lower water jacket 23 adjacent to the middle water jacket 22. The lower water jacket inlet 231 is formed on the protrusion 2324. The cross-sectional area of ​​the lower water jacket 23 gradually decreases in the direction away from the middle water jacket 22. With the guiding effect of the straight pipe 2322, the flow of the cooling medium to the first outlet 2321 and the second outlet 23221 can be more clearly defined. The straight pipe 2322 can be used to discharge more cooling medium, which can prevent the cooling medium from accumulating in the area where the end outlet 23211 is located, improve the internal water flow environment of the lower water jacket 23, reduce eddies and turbulence, improve the water separation clarity, and also improve the cooling effect.

[0108] The specific structure of the intermediate water jacket 22 in the embodiments of this application will be described in detail below.

[0109] like Figure 5 As shown, the intermediate water jacket 22 includes: an intermediate water jacket body 225 and an intermediate water jacket inlet 221 and an intermediate water jacket outlet 222 connected to the intermediate water jacket body 225. The intermediate water jacket inlet 221 is connected to the upper water jacket 21, and the intermediate water jacket outlet 222 is connected to the lower water jacket 23. The cross-sectional area of ​​the portion of the intermediate water jacket body 225 extending toward the intermediate water jacket inlet 221 and the intermediate water jacket outlet 222 gradually decreases, so that in the exhaust flow direction, the cross-sectional area on the upstream side of the intermediate water jacket 22 is greater than the cross-sectional area on the downstream side of the intermediate water jacket 22.

[0110] Specifically, the intermediate water jacket 22 has an intermediate water jacket inlet 221 at its upper end along the height direction and an intermediate water jacket outlet 222 at its lower end along the height direction. The two sides of the width of the intermediate water jacket body 225 are connected to the two intermediate water jacket inlets 221 and the two intermediate water jacket outlets 222, respectively. The portion of the intermediate water jacket body 225 extending towards the intermediate water jacket inlets 221 and the intermediate water jacket outlets 222 (in conjunction with...) Figure 5 and Figure 8 The cross-sectional area of ​​the intermediate water jacket body 225 (as shown) gradually decreases so that the width of the side of the intermediate water jacket body 225 away from the main water jacket 10 is smaller than the width of the side of the intermediate water jacket body 225 adjacent to the main water jacket 10. For example, the projected outline of the intermediate water jacket body 225 in the height direction can be trapezoidal, which can reduce the influence of cooling medium diffusion on cooling capacity and allow the cooling medium flowing through this area to form an impact flow, thereby increasing the flow rate, avoiding the problem of no cooling medium flow in local areas, reducing dead zones (i.e., areas where the cooling medium does not flow), and improving the cooling effect.

[0111] It should be noted that the portion of the intermediate water jacket body 225 extending toward the intermediate water jacket inlet 221 and the intermediate water jacket outlet 222 (in conjunction with) Figure 5 and Figure 8The cross-sectional area of ​​the intermediate water jacket body 225 gradually decreases, so that the surface of the intermediate water jacket body 225 away from the main water jacket 10 includes a planar area located in the middle area of ​​the intermediate water jacket body 225 itself and inclined areas 226 located on both sides of the planar area, so that the projected outline of the intermediate water jacket body 225 can be trapezoidal.

[0112] According to the cylinder head water jacket 100 of this application embodiment, a sloped region 226 is formed on the intermediate water jacket body 225 so that the structural width of the upstream region of the intermediate water jacket 22 in the exhaust flow direction is greater than the structural width of the downstream region in the exhaust flow direction. This reduces the impact of cooling medium flow diffusion on cooling capacity and avoids the phenomenon of cooling medium not flowing in local areas, so that the cooling effect of the intermediate water jacket 22 can remain stable. This improves the cooling stability and reliability of the exhaust fork and exhaust outlet, thereby reducing the risk of cylinder head cracking, extending the service life of the cylinder head, and improving the stability and reliability of the engine.

[0113] like Figure 8 As shown, according to some embodiments of this application, a water jacket block is provided on the intermediate water jacket 22, the water jacket block is located on both sides of the intermediate water jacket body 225, and an intermediate water jacket outlet 222 is formed on the water jacket block.

[0114] Specifically, a water jacket block is set on the intermediate water jacket 22. The water jacket block can be formed as a block outline that protrudes from the outer contour of the intermediate water jacket 22. By setting the water jacket block, the intermediate water jacket 22 can be closer to the exhaust outlet position, thereby improving the cooling effect on the exhaust outlet and reducing the probability of cracking at the exhaust outlet position on the cylinder head.

[0115] exist Figure 8 In the embodiments shown, according to some embodiments of this application, the water jacket block includes: a first water jacket block 223 and a second water jacket block 224, wherein the cross-sectional area of ​​the first water jacket block 223 is larger than the cross-sectional area of ​​the second water jacket block 224, so that the first water jacket block 223 and the second water jacket block 224 are asymmetrically arranged relative to the centerline of the intermediate water jacket 22.

[0116] Specifically, both the first water jacket block 223 and the second water jacket block 224 are formed laterally on the intermediate water jacket body 225, and the cross-sectional area of ​​the first water jacket block 223 is larger than that of the second water jacket block 224. This allows the first water jacket block 223 and the second water jacket block 224 to be asymmetrically arranged relative to the centerline of the intermediate water jacket 22, thereby giving the flow of the cooling medium directionality. The direction of the cooling medium flow allows the cooling medium to... Figure 8As shown, the flow moves from left to right, achieving a directional flow effect and creating a cold zone near the exhaust outlet. This enhances cooling of the exhaust outlet, further reducing the probability of cracking at the exhaust outlet location and improving the reliability and stability of the cylinder head.

[0117] For example, the lateral dimension of the first water jacket block 223 is 1.1 to 2 times the lateral dimension of the second water jacket block 224.

[0118] For example, the lateral dimension of the first water jacket block 223 is 1.1 times, 1.3 times, 1.5 times, 1.7 times, or 2 times the lateral dimension of the second water jacket block 224.

[0119] This makes the difference in lateral dimensions between the first water jacket block 223 and the second water jacket block 224 more reasonable, avoiding a difference that is too small, which would result in poor directional flow, and also avoiding a difference that is too large. This reduces the difficulty of forming the first water jacket block 223 and the second water jacket block 224, reduces the processing difficulty of the intermediate water jacket 22, and allows for a larger flow area between the upper water jacket 21 and the intermediate water jacket 22, and between the intermediate water jacket 22 and the lower water jacket 23, thus improving flow interception.

[0120] According to some embodiments of this application, a plurality of lower water jacket outlets 232 are provided on the side of the lower water jacket 23 adjacent to the main water jacket 10. The plurality of lower water jackets 23 include: an end outlet 23211 located at the end of the lower water jacket 23 and two intermediate outlets 23212 located between the two end outlets 23211, and the lower water jacket outlets 232 are provided adjacent to the exhaust port.

[0121] Specifically, multiple first outlets 2321 are located near the exhaust fork, which can achieve targeted cooling of the exhaust fork area, thereby reducing the probability of cracking in the exhaust fork area of ​​the cylinder head and improving the reliability and stability of the area.

[0122] like Figure 9 As shown, according to some embodiments of this application, a second guide wall 2323 is provided between the end outlet 23211 and the intermediate outlet 23212.

[0123] In this way, when the cooling medium flows into the lower water jacket 23, the second guide wall 2323 can be used to guide more of the cooling medium to the middle outlet 23212. The middle outlet 23212 is set closer to the exhaust port, which can specifically reduce the temperature in the exhaust port area.

[0124] It is understandable that the flow area of ​​the end outlet 23211 is 15%-20% larger than that of the middle outlet 23212.

[0125] For example, the flow area of ​​the end outlet 23211 is 1.15 times, 1.17 times, 1.20 times, etc., the flow area of ​​the middle outlet 23212.

[0126] In this way, the flow rate of the intermediate outlet 23212 can be slightly less than that of the end outlet 23211. A straight pipe 2322 can be installed near the end outlet 23211. By setting a reasonable flow area difference, the flow of the cooling medium in the lower water jacket 23 can be made more uniform, the dead zone can be reduced, and the heat dissipation can be made more uniform, which can reduce the probability of local heat concentration.

[0127] exist Figure 9 In the embodiments shown, according to some embodiments of this application, the outer contour of the lower water jacket 23 between the two intermediate outlets 23212 is concave arc 2325.

[0128] Specifically, the concave arc design 2325 in this area creates a raised area between the two intermediate outlets 23212 inside the flow channel of the lower water jacket 23. The cooling medium flowing into the raised area can flow towards the two intermediate outlets 23212 under the guiding effect of the raised area, which improves the fluidity and increases the flow rate of the cooling medium to improve the cooling effect.

[0129] According to some embodiments of this application, a protrusion 2324 is provided on the lower water jacket 23. The protrusion 2324 protrudes from the lower water jacket 23 and communicates with the outlet 222 of the middle water jacket.

[0130] Specifically, a lower water jacket inlet 231 is formed on the protrusion 2324, and an intermediate water jacket outlet 222 is formed on the first water jacket block 223 and the second water jacket block 224. The intermediate water jacket outlet 222 is connected to the lower water jacket inlet 231, so that the outer contour of the structural part of the intermediate water jacket 22 that is connected to the lower water jacket 23 protrudes from the outer contour of the intermediate water jacket 22, and the outer contour of the structural part of the lower water jacket 23 that is connected to the intermediate water jacket 22 protrudes from the outer contour of the lower water jacket 23, rather than following the conformal design of the flow channel projection contour. This increases the flow area between the intermediate water jacket 22 and the lower water jacket 23, thereby improving the interception, increasing the flow velocity of the cooling medium, and thus improving the cooling effect.

[0131] It is understandable that the structure of the local water jacket 24 is not limited to this. The structure of the connecting area between the main sleeve 241 and the upper water jacket 21 of the local water jacket 24 will be described in detail below.

[0132] like Figure 7As shown, the main stream sleeve 241 is located below the transverse flow rib 214 of the upper water jacket 21, and at least a portion of the main stream sleeve 241 and the upper water jacket 21 define a C-shaped cross section in a direction perpendicular to the crankshaft axis of the engine. The C-shaped cross section is open toward the exhaust outlet of the engine, the upper end of the cross section profile extends to the exhaust outlet of the engine, and the lower end of the cross section profile is spaced apart from the surface where the exhaust outlet is located.

[0133] Specifically, the crossflow rib 214 is used to evenly distribute the cooling medium in the main water jacket 10, and the main flow sleeve 241 is located below the crossflow rib 214, so that some of the cooling medium after the even distribution can flow into the main flow sleeve 241. That is, the water jacket part located below the crossflow rib 214 and converging towards the exhaust outlet forms the main flow sleeve 241. The main flow sleeve 241 and the upper water jacket 21 can form a C-shaped cross section in the direction perpendicular to the crankshaft axis to achieve the wrapping of the upper exhaust passage.

[0134] It should be pointed out that, Figure 7 The section line area is the flow channel inside the upper water jacket 21 and the middle water jacket 22, rather than a solid structure. The cooling medium can flow in the flow channel defined by the section line and achieve heat exchange and cooling with the cylinder head and the components on the cylinder head located outside the flow channel.

[0135] According to the embodiment of this application, the cylinder head water jacket 100, through the C-shaped cross-section defined by the main sleeve portion 241 and the upper water jacket 21, can achieve the wrapping of the upper exhaust passage, so that the coverage area of ​​the layered water jacket 20 is larger. The area below the main sleeve portion 241 is the exhaust fork location or region. By setting the local water jacket 24, the cooling of the exhaust fork is enhanced. Under the premise of avoiding the exhaust fork region not having a corresponding water jacket structure, the wrapping effect of the upper exhaust passage is better. It can increase the coverage area and coverage range of the layered water jacket 20, so as to further improve the cooling effect of the exhaust passage, reduce the probability of cracking in the part of the cylinder head that defines the exhaust passage and exhaust fork, improve the cooling effect of the cylinder head water jacket 100, extend the service life of the cylinder head, and improve the working stability and reliability of the engine.

[0136] like Figure 7 As shown, according to some embodiments of this application, the distance between the plane where the exhaust outlet is located and the closed end of the C-shaped section is L4, the extension length of the main sleeve 241 toward the exhaust outlet side is L5, and satisfies 0.5L4≤L5≤0.67L4.

[0137] Specifically, the C-shaped cross-section includes an upper end and a lower end of the cross-sectional profile defining the open opening, and a closed end defining the closed area of ​​the C-shaped cross-section. The upper end of the cross-sectional profile is defined by the upper water jacket 21, and the closed end is defined by the upper water jacket 21 and the main flow sleeve 241. The lower end of the cross-sectional profile is defined by the main flow sleeve 241. The upper end of the cross-sectional profile extends to the exhaust outlet position to cover a larger area of ​​the upper exhaust duct above it. The distance between the plane where the exhaust outlet is located and the closed end is L4, and the distance between the exhaust outlet and the lower end of the cross-sectional profile is L5. L5 is not less than 0.5 times L4 and not greater than 0.67 times L4. For example, if L4 is 100mm, then the maximum distance of L5 is 67mm and the minimum distance is 50mm.

[0138] This allows for a more reasonable extension dimension at the lower end of the cross-sectional profile, preventing the extension length from being too short. This improves the wrapping effect on the upper exhaust passage, increases the wrapping area, and enhances heat dissipation. At the same time, it avoids the extension length at the lower end of the cross-sectional profile being too long, so that the distance between the branch sleeve 242 and the end of the main stream sleeve 241 that is far from the main body water jacket 10 is smaller. This reduces the probability of a dead zone appearing at the end of the lower end of the cross-sectional profile that is far from the closed end, thus keeping the heat exchange effect stable and further reducing the probability of local cracking in the cylinder head.

[0139] See Figure 7 As shown, according to some embodiments of this application, there is a mating surface between the cylinder block and the cylinder head, and the plane of the lower end of the C-shaped cross-section profile facing the mating surface is inclined relative to the mating surface.

[0140] Specifically, the lower end of the C-shaped cross-section profile faces the side surface of the mating surface and is inclined away from the mating surface in the direction of the exhaust outlet.

[0141] In this way, the exhaust passage can be avoided by tilting the plane, so that the cross-sectional area of ​​the exhaust passage can be set to be larger, thereby increasing the flow coefficient of the exhaust passage. Meanwhile, the flow velocity of the main sleeve 241 can be increased, thereby reducing the heat load from two directions, thus reducing the probability of local cracking of the cylinder head and improving stability and reliability.

[0142] According to some embodiments of this application, the included angle between the inclined surface and the mating surface is A, and satisfies: 5°≤A≤15°.

[0143] For example, angle A can be 5°, 7°, 10°, 13°, 15°, etc.

[0144] Therefore, on the one hand, the angle of the inclined surface can be avoided to reduce the processing difficulty and make the cross-sectional area of ​​the main sleeve 241 more reasonable and the flow effect better. On the other hand, the angle of the inclined surface can be avoided to make the inclined surface avoid the exhaust passage better and the flow coefficient of the exhaust passage more significantly improved.

[0145] exist Figure 7 In the embodiments shown, according to some embodiments of this application, the crossflow rib 214 is constructed as an arc-shaped profile facing the upper water jacket 21, and the angle formed by the line connecting the virtual center of the crossflow rib 214 and the lower starting point and lower ending point of the cross-sectional profile of the C-shaped section is B, and satisfies: 0.3≤B / A≤0.4.

[0146] In this way, while achieving a uniform flow effect, the transverse flow rib 214 is constructed with an arc-shaped profile, which can generate tumble flow so that the cooling medium can better remove the heat from the cylinder head. The ratio of angle B to angle A satisfies the above proportional relationship, which can make the lower end of the cross-sectional profile and the transverse flow rib 214 fit better. That is, the direction of the cooling medium flow can be changed by the inclined plane relative to the mating surface. The arc-shaped profile of the transverse flow rib 214 can block the cooling medium flow and cause the cooling medium flow to diverge and form tumble flow, so as to generate the upward trend of the cooling medium flow and make it easier to impact the transverse flow rib 214, thereby improving the heat dissipation effect on the cylinder head and making the cooling medium flow more easily to the branch sleeve 242.

[0147] According to some embodiments of this application, the upper water jacket 21 also has a second squeezing hole 217, which is located upstream of the main flow jacket 241, and the second squeezing hole 217 and the second clearance portion 212 define a narrow flow passage upstream of the main flow jacket 241.

[0148] Specifically, the second squeezing hole 217 can cooperate with the second clearance part 212 to form a narrow flow section upstream of the main flow sleeve part 241. The cooling medium passing through the narrow flow section, and the first guide wall 213 in the direction towards the exhaust outlet, can converge and define a partial water jacket 24. Thus, under the guidance of the first guide wall 213, it can at least partially converge into the partial water jacket 24. During the flow process, it can impact the cross flow rib 214 to form a tumble flow, effectively increase the flow rate of the cooling medium, reduce the probability of dead zones, and improve the cooling effect.

[0149] Understandably, the first tapering section 2411 and the second tapering section 2413 of the local water jacket 24 are also formed into a narrow passage structure, which can cooperate with the narrow flow section to increase the flow rate and allow the cooling medium to converge, thereby connecting the intermediate water jacket 22 to improve the cooling effect on the exhaust port area and reduce the probability of cracking in this area due to excessive local temperature.

[0150] In this embodiment of the application, the upper water jacket 21 is adjacent to the main water jacket 10. The front side of the second avoidance part 212 can define a first channel. The corresponding second guide wall 2323 can define the outline of the partial water jacket 24 and define a second channel. Both the first channel and the second channel can avoid surrounding components. Components passing through the first channel and the second channel can also be cooled by the cylinder head water jacket 100.

[0151] For example, in other embodiments, the first channel can be formed as a valve guide channel for the valve duct, which can also achieve sufficient cooling of the valve duct and reduce the probability of valve duct failure.

[0152] Referring to the accompanying drawings, the cooling medium flow path of the cylinder head water jacket 100 in this embodiment is as follows:

[0153] Cooling medium is supplied from the cylinder block water jacket to the intake side sub-water jacket 11 of the main water jacket 10. The intake side sub-water jacket 11 supplies cooling medium to the intermediate sub-water jacket 12. The intermediate sub-water jacket 12 further supplies cooling medium to the exhaust side water jacket 13. Cooling medium flowing out of the exhaust side water jacket 13 flows into the upper water jacket 21 via the inlet 211. The cooling medium in the upper water jacket 21 is divided into a first stream and a second stream. The first stream flows out from the upper water jacket outlet 216 and flows into the intermediate water jacket via the inlet 221. The second stream of medium flows from the upper water jacket 21 into the main stream sleeve 241 of the local water jacket 24, and then flows into the intermediate water jacket 22 through the branch sleeve 242 of the straight exhaust channel. The cooling medium in the intermediate water jacket 22 enters the lower water jacket 23 through the intermediate water jacket outlet 222 and the lower water jacket inlet 231. The cooling medium in the lower water jacket 23 flows out through the end outlet 23211, the middle outlet 23212 and the second outlet 23221 on the straight pipe 2322 to complete the circulation of the cooling medium in the cylinder head water jacket 100.

[0154] The intake-side sub-water jacket 11 surrounds the intake manifold to cool it. The intermediate sub-water jacket 12 has a first clearance portion 121, a first guide hole 122, and a first squeezing hole 123 to guide the cooling medium to the spark plug and injector areas for cooling. The exhaust-side sub-water jacket 13 is located near the cylinder head nose area to specifically cool the cylinder head nose area and allow the cooling medium to flow from the intake side to the exhaust side, and then to the layered water jacket 20. The upper water jacket 21 has a second clearance portion 212, a first guide wall 213, a crossflow rib 214, and a second guide hole 213. 15. To guide the cooling medium and ensure its uniform flow, reducing dead zones, the crossflow ribs 214 can cooperate with the main flow sleeve 241, which has a tapered structure, to achieve targeted cooling of the exhaust port area while covering the upper exhaust passage, thereby increasing the coverage area of ​​the cylinder head water jacket 100 and improving the cooling effect. The second guide wall 2323, the concave arc 2325, the straight pipe 2322, and the flow difference between the end outlet 23211 and the middle outlet 23212 on the lower water jacket 23 can all improve the cooling effect of the lower water jacket 23, thereby improving the overall cooling effect and cooling efficiency of the cylinder head water jacket 100.

[0155] This application provides an engine, which includes a body and a cylinder head, wherein the cylinder head water jacket 100 in the above embodiment is disposed on the cylinder head.

[0156] According to the embodiments of this application, the engine using the above-mentioned cylinder head water jacket 100 has a higher cooling effect and cooling efficiency, a lower probability of engine overheating, and higher engine working stability, reliability, and safety.

[0157] 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.

[0158] 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.

[0159] 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, wherein the cylinder head water jacket is disposed on the cylinder head, characterized in that, include: Main water jacket (10); A layered water jacket (20) is located on the exhaust side of the main water jacket (10) and is connected to the main water jacket (10). in The layered water jacket (20) includes: an upper water jacket (21), an intermediate water jacket (22), a lower water jacket (23), and a partial water jacket (24). The upper water jacket (21) is arranged opposite to the upper exhaust channel, and the lower water jacket (23) is arranged opposite to the lower exhaust channel. The intermediate water jacket (22) is located between the upper exhaust channel and the lower exhaust channel and is used to connect the upper water jacket (21) and the lower water jacket (23). The partial water jacket (24) is located on the side of the intermediate water jacket (22) adjacent to the main water jacket (10) and is arranged near the exhaust port of the exhaust channel. One end of the partial water jacket (24) is connected to the upper water jacket (21), and the other end is connected to the intermediate water jacket (22).

2. The cylinder head water jacket according to claim 1, characterized in that, The local water jacket (24) includes: a main stream jacket (241) and two branch jackets (242) located downstream of the main stream jacket (241). The main stream jacket (241) is connected to the upper water jacket (21). The two branch jackets (242) are far away from the main stream jacket (241) and extend away from each other. The branch jackets (242) both point towards the intermediate water jacket (22).

3. The cylinder head water jacket according to claim 2, characterized in that, The main flow sleeve (241) includes at least one tapering section in the direction of cooling medium flow, where the downstream flow area is smaller than the upstream flow area.

4. The cylinder head water jacket according to claim 3, characterized in that, The tapering section includes a first tapering section (2411) and a second tapering section (2413) arranged sequentially in the direction of cooling medium flow. The flow area at the inlet of the first tapering section (2411) is greater than the flow area at the inlet of the second tapering section (2413), and the flow area at the inlet of the second tapering section (2413) is greater than the flow area at the outlet of the first tapering section (2411).

5. The cylinder head water jacket according to claim 4, characterized in that, The minimum flow diameter of the first tapering section (2411) is a, the maximum flow diameter of the second tapering section (2413) is b, and the maximum flow diameter of the first tapering section (2411) is c, and satisfy 1.2≤b / a≤1.3, 2≤c / a.

6. The cylinder head water jacket according to claim 4, characterized in that, The length of the first tapered segment (2411) is L1, and a tapered segment (2412) is provided between the second tapered segment (2413) and the first tapered segment (2411). The length of the tapered segment (2412) is L2, and the length of the second tapered segment (2413) is L3, and the following conditions are met: 0.25≤L3 / L1≤0.3, 0.13≤L2 / L3≤0.

18.

7. The cylinder head water jacket according to claim 4, characterized in that, The branch sleeve (242) is connected laterally to the second tapered section (2413), the end of which is formed as a pointed corner (2414).

8. The cylinder head water jacket according to claim 2, characterized in that, The branch sleeve (242) extends obliquely relative to the horizontal plane to communicate with the intermediate water jacket (22), and the branch sleeve (242) has at least a sand-clearing hole formed in the intermediate water jacket (22), and is further perforated to communicate with the local water jacket (24).

9. The cylinder head water jacket according to claim 8, characterized in that, The angle between the branch sleeve (242) and the horizontal plane is 40°-50°.

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

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