Engine cylinder head cooling water jacket and engine

Abstract

The present invention belongs to the technical field of engines, and particularly relates to an engine cylinder head cooling water jacket and an engine. In the engine cylinder head cooling water jacket, a water pump inlet, a cylinder water intake and a first connecting hole are provided on the first body of the cylinder head lower water jacket, and an exhaust manifold lower water channel and a cylinder cooling water channel are formed on the first body; the water pump inlet and the cylinder water intake are arranged diagonally on the exhaust manifold lower water channel; a second connecting hole is provided on the second body of the cylinder head upper water jacket, and an exhaust manifold upper water channel is formed on the second body; the coolant enters from the water pump inlet, and after flowing through the exhaust manifold lower water channel, part of the coolant flows through the cylinder cooling water channel, and then enters the exhaust manifold upper water channel through the first connecting hole and the second connecting hole in sequence, and the other part of the coolant flows into the engine cylinder body from the cylinder water intake. The present invention can maximize the coolant flow rate in the higher heat load area in the cylinder head lower water jacket, thereby improving the cooling effect of the engine cylinder head.

Description

Technical Field

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

[0002] According to the different heat loads during operation, the engine cylinder head can be divided into high heat load area, relatively high heat load area and low heat load area. Among them, the high heat load area is the nose bridge area, the relatively high heat load area mainly includes the cylinder head exhaust manifold, the cylinder head exhaust side, the cylinder head between cylinders and the exhaust outlet, and the other areas of the engine cylinder head are low heat load areas. With the continuous development of engine technology, the power density of the engine is constantly improving, and the heat load of the engine cylinder head is getting higher and higher. In order to avoid problems such as high temperature cracking of the engine cylinder head, more and more stringent requirements are put forward for the cooling performance of the engine cylinder head water jacket.

[0003] In the prior art, a double-layer water jacket is used on the engine cylinder head to promote the flow of coolant in areas with higher heat loads to avoid flow dead zones in high heat load areas, thereby enhancing the cooling effect of the water jacket. However, the scheme in the prior art usually has the following problems: first, the flow organization in the higher heat load area of ​​the engine cylinder head is not good, which leads to poor cooling effect; second, the connecting holes between the upper and lower layers of the double-layer water jacket of the engine cylinder head can only be completed by casting, and the casting process is complicated. After casting, the connecting holes cannot be inspected and further processed. Burrs are easily generated here due to the presence of the parting surface. Because the burrs cannot be inspected and removed, the overall cooling effect and pressure loss of the engine cylinder head are affected, and even the entire engine is scrapped; third, the coolant only enters the exhaust side cooling water channel through the cooling water channel in the nose bridge area. If the flow rate is too high, it is easy to cause cavitation in the nose bridge area. If the flow rate is too low, the cooling effect is poor. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the problem that the cooling effect of the engine cylinder head in the prior art is poor, an engine cylinder head cooling water jacket and an engine are provided.

[0005] In order to solve the above technical problems, on the one hand, an embodiment of the present invention provides an engine cylinder head cooling water jacket, comprising a cylinder head lower water jacket and a cylinder head upper water jacket connected to the cylinder head lower water jacket;

[0006] The cylinder head lower water jacket comprises a first body, the first body is provided with a water pump inlet, a cylinder water intake and a first connecting hole, the first body is formed with an exhaust manifold lower water channel and a cylinder cooling water channel; the water pump inlet and the cylinder water intake are arranged diagonally on the exhaust manifold lower water channel;

[0007] The cylinder head upper water jacket comprises a second body, the second body is provided with a second connecting hole communicating with the first connecting hole, and the second body is formed with an exhaust manifold upper water channel;

[0008] The coolant enters from the water pump inlet, flows through the lower water channel of the exhaust manifold, and then part of the coolant flows through the cylinder cooling water channel, and then enters the upper water channel of the exhaust manifold through the first connecting hole and the second connecting hole in sequence, and the other part of the coolant flows into the engine cylinder body from the cylinder water inlet.

[0009] Optionally, the cylinder cooling water channel includes a nose bridge area water channel, an exhaust side water channel, a nose bridge area regulating water channel and an inter-cylinder cooling water channel;

[0010] After the coolant flows through the lower water channel of the exhaust manifold, part of the coolant enters the exhaust side water channel and the inter-cylinder cooling water channel through the nose bridge area water channel and the nose bridge area regulating water channel, and flows into the first connecting hole from the exhaust side water channel and the inter-cylinder cooling water channel.

[0011] Optionally, the cylinder cooling water channel further includes an intake side water channel communicating with the inter-cylinder cooling water channel;

[0012] Part of the coolant enters the exhaust side water channel and the inter-cylinder cooling water channel through the nose bridge area water channel and the nose bridge area regulating water channel, and flows from the exhaust side water channel and the inter-cylinder cooling water channel into the intake side water channel. The first connecting hole includes a first middle hole arranged between the inter-cylinder cooling water channel and the intake side water channel. The first middle hole is connected to the inter-cylinder cooling water channel and the intake side water channel.

[0013] Optionally, a water channel connected to the upper water channel of the exhaust manifold is also formed on the second body, and the second connecting hole also includes a second middle hole, one end of the second middle hole is connected to the water channel, and the other end of the second middle hole is connected to the first middle hole.

[0014] Optionally, a first water jacket foot communicating with the first middle hole is provided on a side of the first body away from the second body, and the first water jacket foot is sealed by a first cylinder gasket.

[0015] Optionally, the first water jacket foot and the second water jacket foot are sealed and connected via a first cylinder gasket.

[0016] Optionally, the first connecting hole further comprises two first side holes arranged at both ends of the exhaust side of the cylinder head; the second connecting hole further comprises two second side holes arranged at both ends of the exhaust side of the cylinder head;

[0017] One end of the first side hole is communicated with the exhaust side water channel, and the other end of the first side hole is communicated with the second side hole; and one end of the second side hole away from the first side hole is communicated with the exhaust manifold upper water channel.

[0018] Optionally, a second water jacket foot communicating with the first side hole is provided on a side of the first body away from the second body, and the second water jacket foot is sealed by a second cylinder gasket.

[0019] Optionally, the first body is further provided with a guide hole for guiding the coolant in the lower water channel of the exhaust manifold to the water channel in the nose bridge area.

[0020] Optionally, the first body is further provided with an accessory water intake and an exhaust outlet water channel, the accessory water intake is communicated with the lower water channel of the exhaust manifold through the exhaust outlet water channel, the accessory water intake is arranged on a side of the exhaust outlet water channel away from the water pump inlet, and the second body is further provided with a water outlet communicated with the upper water channel of the exhaust manifold, the water outlet is arranged on a side of the upper water channel of the exhaust manifold away from the first connecting hole.

[0021] According to the engine cylinder head cooling water jacket of the embodiment of the invention, the water pump inlet and the cylinder water intake are arranged diagonally on the lower water channel of the exhaust manifold; therefore, after the coolant enters the lower water channel of the exhaust manifold from the water pump inlet, it must first flow through the entire lower water channel of the exhaust manifold, and then part of the coolant will flow into the engine cylinder body from the cylinder water intake; the other part of the coolant also flows through the entire lower water channel of the exhaust manifold, and then flows through the cylinder cooling water channel and enters the upper water channel of the exhaust manifold through the first connecting hole and the second connecting hole in sequence. In the above process, all the coolant must first flow through the entire lower water channel of the exhaust manifold before being diverted at the cylinder water intake position. Therefore, the coolant flow rate in the higher heat load area of ​​the cylinder head lower water jacket can be maximized, and the cooling effect of the higher heat load area of ​​the engine cylinder head can be improved to the greatest extent.

[0022] On the other hand, an embodiment of the present invention further provides an engine, which includes the above-mentioned engine cylinder head cooling water jacket. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of an engine cylinder head cooling water jacket provided by an embodiment of the present invention.

[0024] Figure 2 The present invention is a bottom view of a lower water jacket of a cylinder head cooling water jacket of an engine cylinder head provided by an embodiment of the present invention.

[0025] Figure 3 The present invention is a top view of a lower water jacket of a cylinder head cooling water jacket of an engine cylinder head provided by an embodiment of the present invention.

[0026] Figure 4 The diagram is a schematic diagram of the coolant flow in the lower water jacket of the cylinder head cooling water jacket of an engine cylinder head provided by an embodiment of the present invention.

[0027] Figure 5 The diagram is a schematic diagram of the coolant flow in the upper water jacket of the cylinder head cooling water jacket of an engine cylinder head provided by an embodiment of the present invention.

[0028] The reference numerals in the specification are as follows:

[0029] 1. Cylinder head lower water jacket; 101. First body; 102. Water pump inlet; 103. Cylinder water inlet; 104. First connecting hole; 1041. First middle hole; 1042. First side hole; 105. Exhaust manifold lower water channel; 106. Cylinder cooling water channel; 1061. Nose bridge area water channel; 1062. Exhaust side water channel; 1063. Nose bridge area regulating water channel; 1064. Inter-cylinder cooling water channel; 1065. Intake side water channel; 107. Second water jacket foot; 109. Diversion hole; 110. Accessory water inlet; 111. Exhaust outlet water channel;

[0030] 2. The upper water jacket of the cylinder head; 201. The second body; 202. The second connecting hole; 2021. The second middle hole; 2022. The second side hole; 203. The upper water channel of the exhaust manifold; 204. The water diversion channel; 205. The water outlet. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] It should be understood that the directions or positional relationships indicated by terms such as "upper", "lower", "front", "back", "left", "right", and "middle" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0033] like Figure 1 As shown, Figure 1 1 is a schematic diagram of the three-dimensional structure of the engine cylinder head cooling water jacket provided by an embodiment of the present invention. Figure 1 The upper part of the engine cylinder head cooling water jacket shown (for example: the upper layer of the cylinder head water jacket, etc.); "lower" means Figure 1 Below the engine cylinder head cooling water jacket as shown (for example: cylinder head lower water jacket, etc.).

[0034] like Figures 1 to 5 As shown, an embodiment of the present invention provides an engine cylinder head cooling water jacket, comprising a cylinder head lower water jacket 1 and a cylinder head upper water jacket 2 connected to the cylinder head lower water jacket 1; the cylinder head lower water jacket 1 comprises a first body 101, the first body 101 is provided with a water pump inlet 102, a cylinder water intake port 103 and a first connecting hole 104, the first body 101 is formed with an exhaust manifold lower water channel 105 and a cylinder cooling water channel 106; the water pump inlet 102 is connected to the cylinder water intake port 103 and the first connecting hole 104 3 is arranged diagonally on the exhaust manifold lower water channel 105; it can be understood that the water pump inlet 102 and the cylinder water intake 103 are arranged diagonally on the exhaust manifold lower water channel 105, so that the coolant can be diverted to the cylinder at the cylinder water intake 103 after completely flowing through the exhaust manifold lower water channel 105, so that the coolant flow in the exhaust manifold lower water channel 105 can be maximized, thereby improving the cooling effect of the exhaust manifold area belonging to the higher heat load area of ​​the engine cylinder head.

[0035] The cylinder head upper water jacket 2 includes a second body 201, a second connecting hole 202 communicating with the first connecting hole 104 is provided on the second body 201, and an exhaust manifold upper water channel 203 is formed on the second body 201; understandably, the first body 101 is communicated with the second body 201 through the first connecting hole 104 and the second connecting hole 202. Understandably, the cylinder head lower water jacket 1 and the cylinder head upper water jacket 2 are integrally cast.

[0036] The coolant enters from the water pump inlet 102, flows through the exhaust manifold lower water channel 105, and then part of the coolant flows through the cylinder cooling water channel 106, and then enters the exhaust manifold upper water channel 203 through the first connecting hole 104 and the second connecting hole 202 in sequence, and the other part of the coolant flows into the engine cylinder from the cylinder water inlet 103.

[0037] In the engine cylinder head cooling water jacket of the above embodiment, the water pump inlet 102 and the cylinder water intake port 103 are arranged diagonally on the exhaust manifold lower water channel 105; therefore, after the coolant enters the exhaust manifold lower water channel 105 from the water pump inlet 102, it first flows through the entire exhaust manifold lower water channel 105, and then part of the coolant flows into the engine cylinder body from the cylinder water intake port 103; another part of the coolant also flows through the entire exhaust manifold lower water channel 105, and then flows through the cylinder cooling water channel 106 and enters the exhaust manifold upper water channel 203 through the first connecting hole 104 and the second connecting hole 202 in sequence. In the above process, all the coolant must first flow through the entire exhaust manifold lower water channel 105 before being diverted at the cylinder water inlet 103. Therefore, the coolant flow in the higher heat load area in the cylinder head lower water jacket 1 (the exhaust manifold lower water channel 105 belongs to the higher heat load area) can be maximized, which can maximize the cooling effect of the higher heat load area of ​​the engine cylinder head.

[0038] In one embodiment, if Figures 1 to 4 As shown, the cylinder cooling water channel 106 includes a nose bridge area water channel 1061, an exhaust side water channel 1062, a nose bridge area regulating water channel 1063 and an inter-cylinder cooling water channel 1064; after the coolant flows through the exhaust manifold lower layer water channel 105, part of the coolant enters the exhaust side water channel 1062 and the inter-cylinder cooling water channel 1064 through the nose bridge area water channel 1061 and the nose bridge area regulating water channel 1063, and flows into the first connecting hole 104 from the exhaust side water channel 1062 and the inter-cylinder cooling water channel 1064. That is, after the coolant flows through the exhaust manifold lower layer water channel 105 and part of it is diverted to the cylinder water intake 103, the remaining part of the coolant enters the exhaust side water channel 1062 and the inter-cylinder cooling water channel 1064 through the nose bridge area water channel 1061 and the nose bridge area regulating water channel 1063. In this embodiment, a nose bridge area regulating water channel 1063 is arranged in the cylinder cooling water channel 106 of the lower water jacket 1 of the cylinder head. The nose bridge area regulating water channel 1063 can regulate the flow rate of the coolant entering the nose bridge area water channel 1061, and the size of the nose bridge area regulating water channel 1063 can be adjusted by simulation calculation in combination with the flow performance of the engine cylinder head water jacket, and then by adjusting the size of the nose bridge area regulating water channel 1063, the flow rate of the nose bridge area water channel 1061 of each cylinder can be adjusted. This embodiment can achieve the following purpose: the flow rate of the coolant in the nose bridge area water channel 1061 is increased as much as possible without causing cavitation, so as to maximize the cooling effect of the nose bridge area (high heat load area) of each cylinder while avoiding cavitation.

[0039] In one embodiment, if Figures 2 to 4As shown, the cylinder cooling water channel 106 also includes an intake side water channel 1065 connected to the inter-cylinder cooling water channel 1064; part of the coolant enters the exhaust side water channel 1062 and the inter-cylinder cooling water channel 1064 through the nose bridge area water channel 1061 and the nose bridge area regulating water channel 1063, and flows from the exhaust side water channel 1062 and the inter-cylinder cooling water channel 1064 into the intake side water channel 1065. It can be understood that although Figure 3 The cylinder head intake side B of the engine cylinder head shown in the figure belongs to the water channel, which is a low heat load area (the cylinder head exhaust side A belongs to a higher heat load area), but in this embodiment, considering the overall cooling effect of various parts of the cylinder head, an intake side water channel 1065 is set here. When the engine cylinder head cooling water jacket is initially filled with coolant, the coolant flows from the inter-cylinder cooling water channel 1064 into the intake side water channel 1065, so that each cylinder of the engine can be properly cooled in this area. It can be understood that Figure 3 The cylinder head intake side B shown in the figure belongs to the low heat load area. After the intake side water channel 1065 is filled with coolant, most of the coolant flows into the inter-cylinder cooling water channel 1064 and / or the exhaust side water channel 1062, and then flows into the cylinder head upper water jacket 2 to ensure the cooling effect of the cylinder head upper water jacket 2; and a very small part of the coolant flows out of the cylinder head upper water jacket 2. Figure 3 The cooling liquid enters from one end of the intake side water channel 1065 shown in the figure, and then flows back from the other end to another inter-cylinder cooling water channel 1064 communicating with the intake side water channel 1065 (or flows back to another exhaust side water channel 1062 communicating with the intake side water channel 1065, or flows back to another first connecting hole 104 communicating with the intake side water channel 1065). In this way, since the same amount of cooling liquid flows in and flows back out of the intake side water channel 1065, the amount of cooling liquid in the cylinder cooling water channel 106 does not change, and further, it does not affect the flow rate of the cooling liquid entering the upper water channel of the cylinder head from the first connecting hole 104, and at the same time, it can also meet the cooling requirements of the cylinder head intake side B belonging to the low heat load area.

[0040] In one embodiment, if Figure 3 and Figure 4 As shown, the first connecting hole 104 includes a first middle hole 1041 disposed between the inter-cylinder cooling water channel 1064 and the intake side water channel 1065, and the first middle hole 1041 is connected to the inter-cylinder cooling water channel 1064 and the intake side water channel 1065. It can be understood that the first middle hole 1041 is disposed between the cylinders of the engine, so the number of the first middle holes 1041 can be determined according to the number of cylinders of the engine, for example, Figure 3The number of cylinders of the engine is 4, and at this time, the number of the first intermediate holes 1041 set between the cylinders is 3. Further, the first intermediate hole 1041 is located between the inter-cylinder cooling water channel 1064 and the intake side water channel 1065, so that all the coolant entering the cylinder cooling water channel 106 will flow through the nose bridge area water channel 1061 and the nose bridge area regulating water channel 1063 respectively, and then flow through the exhaust side water channel 1062 and the inter-cylinder cooling water channel 1064, and then flow into the first intermediate hole 1041 (and Figure 4 In this way, the coolant enters the upper water channel of the cylinder head through the first middle hole 1041 (and the first side hole 1042) only after cooling the entire cylinder head exhaust side A (when the engine cylinder head cooling water jacket is initially filled with coolant, the coolant will also flow from the inter-cylinder cooling water channel 1064 into the intake side water channel 1065), which greatly improves the cooling capacity of the cylinder head exhaust side A between the cylinders of the engine cylinder head water jacket.

[0041] In one embodiment, if Figure 1 and Figure 5 As shown, the second body 201 is also formed with a water inlet 204 connected to the exhaust manifold upper water channel 203, and the second connecting hole 202 also includes a second middle hole 2021, one end of the second middle hole 2021 is connected to the water inlet 204, and the other end of the second middle hole 2021 is connected to the first middle hole 1041. That is, in this embodiment, the position where the first middle hole 1041 in the cylinder head lower water jacket 1 is set is a certain distance from the exhaust manifold upper water channel 203 in the exhaust manifold area of ​​the cylinder head upper water jacket 2. At this time, the first middle hole 1041 is connected to the exhaust manifold upper water channel 203 through the water inlet 204, and the flow rate and flow direction of the coolant flowing into the exhaust manifold upper water channel 203 are controlled by the water inlet 204, so that the flow rate of the coolant in the exhaust manifold upper water channel 203 is uniform, and the coolant is allowed to flow to all areas of the exhaust manifold upper water channel 203 as much as possible, thereby achieving a better cooling effect in the exhaust manifold area.

[0042] In one embodiment, a first water jacket foot (not shown) communicating with the first middle hole 1041 is provided on the side of the first body 101 away from the second body 201. That is, the first middle hole 1041 is located on the first water jacket foot 101 (one first middle hole 1041 is correspondingly provided with one first water jacket foot), and the first water jacket foot is communicated with the first middle hole 1041. In this way, after the lower water jacket 1 and the upper water jacket 2 of the cylinder head are cast, the machining tool can be extended from the position of the first water jacket foot (the first water jacket foot is away from the opening of the first middle hole 1041) into the first middle hole 1041, so as to remove the burrs generated in the first middle hole 1041 (corresponding to the first water jacket foot) during the casting process. In this way, the accuracy of the first middle hole 1041 is guaranteed. At the same time, the first water jacket foot is a solid core during the casting process and can be used as a casting support foot. Preferably, the first water jacket foot is sealed by a first cylinder gasket (not shown). It can be understood that the first cylinder gasket can be installed on the engine cylinder block. When the engine cylinder head is installed on the engine cylinder block, the first cylinder gasket seals the opening of the first water jacket foot away from the first middle hole 1041 to ensure that the coolant flowing in the first middle hole 1041 does not leak.

[0043] In one embodiment, if Figure 3 and Figure 4 As shown, the first connection hole 104 also includes two first side holes 1042 arranged at both ends of the cylinder head exhaust side A; the second connection hole 202 also includes two second side holes 2022 arranged at both ends of the cylinder head exhaust side A; one end of the first side hole 1042 is connected to the exhaust side water channel 1062, and the other end of the first side hole 1042 is connected to the second side hole 2022; the end of the second side hole 2022 away from the first side hole 1042 is connected to the exhaust manifold upper water channel 203. The two first side holes 1042 are distributed at both ends of the cylinder head exhaust side A, so that part of the coolant flows through the exhaust side water channel 1062 at both ends of the cylinder head exhaust side edge of each cylinder, and then flows through the first side hole 1042 and the second side hole 2022 into the cylinder head upper water jacket 2, avoiding the flow dead zone at both ends of the cylinder head exhaust side edge of each cylinder, thereby improving the cooling capacity of this area.

[0044] In one embodiment, if Figure 3 and Figure 4As shown, a second water jacket foot 107 communicating with the first side hole 1042 is provided on the side of the first body 101 away from the second body 201. That is, the first side hole 1042 is located on the second water jacket foot 107 (one second water jacket foot 107 is provided corresponding to one first side hole 1042), and the second water jacket foot 107 is communicated with the first side hole 1042. In this way, after the lower water jacket 1 and the upper water jacket 2 of the cylinder head are cast, the machining tool can be extended from the position of the second water jacket foot 107 (the second water jacket foot 107 is away from the opening of the first side hole 1042) into the first side hole 1042, so as to remove the burrs generated by the first side hole 1042 (corresponding to the second water jacket foot 107) during the casting process. In this way, the accuracy of the first side hole 1042 is guaranteed. At the same time, the second water jacket foot 107 is solid during the casting process and can be used as a casting support foot. Optionally, the second water jacket foot 107 is sealed by a second cylinder gasket (not shown). It is understandable that the second cylinder gasket can be installed on the engine cylinder block, and when the engine cylinder head is installed on the engine cylinder block, the second cylinder gasket seals the opening of the second water jacket foot 107 away from the first side hole 1042 to ensure that the coolant flowing in the first side hole 1042 does not leak.

[0045] It can be understood that in the present invention, the first cylinder gasket and the second cylinder gasket are both located between the engine cylinder head and the engine cylinder block. The first cylinder gasket and the second cylinder gasket can be the same sealing cylinder gasket or two independent sealing cylinder gaskets. Their specific shape and installation method can be designed according to the structure of the engine cylinder head and the engine cylinder block.

[0046] In one embodiment, if Figure 3 and Figure 4 As shown, the first body 101 is also provided with a guide hole 109 for guiding the coolant in the lower water channel 105 of the exhaust manifold to the nose bridge area water channel 1061. That is, in order to solve the problem that the flow in the nose bridge area (high heat load area) is not well controlled, the cooling effect is not good, and the uniformity is poor, the guide hole 109 is arranged on the first body 101 at the position corresponding to the upper water channel 203 of the exhaust manifold, wherein the position of the guide hole 109 can be determined by simulation calculation in combination with the flow performance of the engine cylinder head water jacket, and the guide hole 109 can guide the coolant to flow to the nose bridge area water channel 1061 of each cylinder of the engine, thereby ensuring the consistency of the flow direction and flow velocity in the nose bridge area of ​​each cylinder of the engine, so that the uniformity of the coolant is better.

[0047] In one embodiment, if Figure 1 , Figure 3 and Figure 4As shown, the first body 101 is also provided with an accessory water intake port 110 and an exhaust outlet water channel 111. The accessory water intake port 110 is communicated with the exhaust manifold lower water channel 105 through the exhaust outlet water channel 111. The accessory water intake port 110 is arranged on a side of the exhaust outlet water channel 111 away from the water pump inlet 102. That is, an exhaust outlet water channel 111 is arranged between the exhaust outlets of the cylinder head, and the accessory water intake port 110 is arranged next to the exhaust outlet (and on the side of the exhaust outlet water channel 111 away from the water pump inlet 102). In this way, the coolant entering the water pump inlet 102 enters the exhaust outlet water channel 111 from the lower water channel 105 of the exhaust manifold, flows through the entire exhaust outlet water channel 111, and then enters the accessory water intake port 110. In this way, the coolant flow rate between the exhaust outlets can be increased, and the cooling capacity of the exhaust outlet area as a higher heat load area can be improved (the amount of coolant that needs to be diverted at the accessory water intake port 110 is relatively small, which will not adversely affect the cooling effect of the coolant flowing into the nose bridge area).

[0048] In one embodiment, if Figure 5 As shown, the second body 201 is further provided with a water outlet 205 communicating with the exhaust manifold upper water channel 203, and the water outlet 205 is arranged on the side of the exhaust manifold upper water channel 203 away from the first connecting hole 104. That is, the water outlet 205 is arranged on the side of the exhaust manifold upper water channel 203 away from the first connecting hole 104, so that the coolant entering from the first connecting hole 104 first flows through the entire exhaust manifold upper water channel 203, and then flows out from the water outlet 205, so that the cooling effect on the exhaust manifold area is better.

[0049] In order to understand the embodiments of the present invention, the flow process of the coolant in the following embodiments is cited to illustrate the present invention:

[0050] In the cylinder head lower water jacket 1, the coolant enters the exhaust manifold lower water channel 105 of the cylinder head lower water jacket 1 from the water pump inlet 102, and then part of the coolant enters the accessory water intake port 110 from the exhaust manifold lower water channel 105 via the exhaust outlet inter-water channel 111, and then this part of the coolant enters the engine accessories; after all the remaining coolant flows through the entire exhaust manifold lower water channel 105, part of the coolant enters the engine cylinder block from the cylinder block water intake port 103, and the other part flows into the exhaust side water channel 1062 and the inter-cylinder cooling water channel 1064 after passing through the nose bridge area water channel 1061 and the nose bridge area regulating water channel 1063, and finally enters the cylinder head upper water jacket 2 through the first connecting hole 104 (including the first middle hole 1041 and the first side hole 1042) and the second connecting hole 202 (including the second middle hole 2021 and the second side hole 2022) in sequence.

[0051] In the upper water jacket 2 of the cylinder head, a part of the coolant flows from the second middle hole 2021 through the water inlet channel 204 into the upper water channel 203 of the exhaust manifold, and the other part directly enters the upper water channel 203 of the exhaust manifold from the second side hole 2022, and all the coolant converges in the upper water channel 203 of the exhaust manifold and flows out from the water outlet 205.

[0052] On the other hand, an embodiment of the present invention further provides an engine, which includes the above-mentioned engine cylinder head cooling water jacket.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine cylinder head cooling water jacket, comprising a cylinder head lower water jacket and a cylinder head upper water jacket connected to the cylinder head lower water jacket, characterized in that , The cylinder head lower water jacket comprises a first body, the first body is provided with a water pump inlet, a cylinder water intake and a first connecting hole, the first body is formed with an exhaust manifold lower water channel and a cylinder cooling water channel; the water pump inlet and the cylinder water intake are arranged diagonally on the exhaust manifold lower water channel; The cylinder head upper water jacket comprises a second body, the second body is provided with a second connecting hole communicating with the first connecting hole, and the second body is formed with an exhaust manifold upper water channel; The coolant enters from the water pump inlet, and after completely flowing through the lower water channel of the exhaust manifold to maximize the coolant flow in the lower water channel of the exhaust manifold for cooling the exhaust manifold area, part of the coolant flows through the cylinder cooling water channel, and then enters the upper water channel of the exhaust manifold through the first connecting hole and the second connecting hole in sequence, and another part of the coolant flows into the engine cylinder block from the cylinder water inlet and cools the engine cylinder block.

2. The engine cylinder head cooling water jacket according to claim 1, characterized in that: The cylinder cooling water channel includes a nose bridge area water channel, an exhaust side water channel, a nose bridge area regulating water channel and an inter-cylinder cooling water channel; After the coolant flows through the lower water channel of the exhaust manifold, part of the coolant enters the exhaust side water channel and the inter-cylinder cooling water channel through the nose bridge area water channel and the nose bridge area regulating water channel, and flows into the first connecting hole from the exhaust side water channel and the inter-cylinder cooling water channel.

3. The engine cylinder head cooling water jacket according to claim 2, characterized in that: The cylinder cooling water channel also includes an intake side water channel communicating with the inter-cylinder cooling water channel; Part of the coolant enters the exhaust side water channel and the inter-cylinder cooling water channel through the nose bridge area water channel and the nose bridge area regulating water channel, and flows from the exhaust side water channel and the inter-cylinder cooling water channel into the intake side water channel; The first connecting hole includes a first middle hole disposed between the inter-cylinder cooling water channel and the intake side water channel, and the first middle hole is communicated with the inter-cylinder cooling water channel and the intake side water channel.

4. The engine cylinder head cooling water jacket according to claim 3, characterized in that: The second body is also formed with a water channel connected to the upper water channel of the exhaust manifold. The second connecting hole also includes a second middle hole, one end of the second middle hole is connected to the water channel, and the other end of the second middle hole is connected to the first middle hole.

5. The engine cylinder head cooling water jacket according to claim 4, characterized in that: A first water jacket foot communicating with the first middle hole is provided on one side of the first body away from the second body, and the first water jacket foot is sealed by a first cylinder gasket.

6. The engine cylinder head cooling water jacket according to claim 2, characterized in that: The first connection hole further includes two first side holes arranged at both ends of the exhaust side of the cylinder head; the second connection hole further includes two second side holes arranged at both ends of the exhaust side of the cylinder head; One end of the first side hole is communicated with the exhaust side water channel, and the other end of the first side hole is communicated with the second side hole; and one end of the second side hole away from the first side hole is communicated with the exhaust manifold upper water channel.

7. The engine cylinder head cooling water jacket according to claim 6, characterized in that: A second water jacket foot communicating with the first side hole is provided on one side of the first body away from the second body, and the second water jacket foot is sealed by a second cylinder gasket.

8. The engine cylinder head cooling water jacket according to claim 2, characterized in that: The first body is also provided with a guide hole for guiding the coolant in the lower water channel of the exhaust manifold to the water channel in the nose bridge area.

9. The engine cylinder head cooling water jacket according to claim 1, characterized in that: The first body is also provided with an accessory water intake and an exhaust outlet water channel, the accessory water intake is communicated with the lower water channel of the exhaust manifold through the exhaust outlet water channel, the accessory water intake is arranged on a side of the exhaust outlet water channel away from the water pump inlet, the second body is also provided with a water outlet communicated with the upper water channel of the exhaust manifold, the water outlet is arranged on a side of the upper water channel of the exhaust manifold away from the first connecting hole.

10. An engine, characterized in that: An engine cylinder head cooling water jacket comprising any one of claims 1 to 9.

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