Engine cylinder head with high cooling uniformity and V-shaped engine

Abstract

The present invention provides an engine cylinder head and a V-shaped engine with high cooling uniformity. The engine cylinder head is arranged on the cylinder body of the engine, and is provided with a plurality of groups of piston holes, intake channels and exhaust channels in the cylinder head. The cylinder head is provided with cooling water channels surrounding the outsides of the piston holes, intake channels and exhaust channels. The cylinder head is provided with upper water ports between adjacent piston holes, and the cylinder head is provided with baffles extending from the upper water ports and spaced from the upper water ports between adjacent exhaust channels. The cylinder head is provided with guide plates and / or grooves between adjacent intake channels to form a water return area matching the baffles. The purpose of the present invention is to improve the cooling uniformity of the engine cylinder head and extend the service life of the engine.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an engine cylinder head and a V-shaped engine with high cooling uniformity. Background Art

[0002] The engine includes a cylinder block, a cylinder head and a cylinder head cover. The cylinder head is installed above the cylinder block and below the cylinder head cover. The cylinder head is used to seal the cylinder block. The cylinder head, the piston top and the cylinder block wall together form a combustion chamber. The cylinder head also carries the valve train. The cylinder head has intake and exhaust channels for intake and exhaust. In order to ensure the cooling efficiency of the engine, a cooling channel is usually provided in the cylinder block. A water pump is provided on the side of the cylinder block to supply water to the cooling channel. At the same time, a cooling water channel connected to the cooling channel is provided in the cylinder head. The cooling water channel surrounds the piston and the intake and exhaust channels.

[0003] For example, in the Chinese patent literature, patent number CN2015200340605 was granted on July 29, 2015. The engine cylinder head disclosed in the application has multiple cylinders, and a cooling water channel is arranged around the exhaust channel and the intake channel. The application attempts to improve the cooling efficiency of the cooling water by adjusting the position of the exhaust channel outlet relative to the piston.

[0004] The shortcomings of the prior art are that in the cooling water channel, the cooling water between adjacent combustion chambers passes quickly, there is a dead water area, heat is difficult to transfer, the cooling speed between the outlet channels and the intake channels is slow, the engine cooling speed is uneven, affecting the service life and reliability of the engine. Summary of the invention

[0005] Based on the above-mentioned deficiencies in the prior art, the present invention provides an engine cylinder head and a V-shaped engine with high cooling uniformity, thereby improving the cooling uniformity of the engine cylinder head and extending the service life of the engine.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions.

[0007] An engine cylinder head with high cooling uniformity is arranged on the cylinder body of the engine, and is provided with a plurality of groups of piston holes, intake passages and exhaust passages in the cylinder head, and is provided with cooling water channels surrounding the outsides of the piston holes, the intake passages and the exhaust passages in the cylinder head, and is provided with upper water inlets between adjacent piston holes, and is provided with baffles extending from the upper water inlets and spaced apart from the upper water inlets between adjacent exhaust passages, and is provided with guide plates and / or grooves between adjacent intake passages to form a water return area matching the baffles.

[0008] The cylinder head is provided with cooling water channels surrounding the piston hole, intake channel and exhaust channel, which can maximize the use of the heat exchange capacity of the cooling water and improve the cooling efficiency. The setting of the upper water inlet allows the cooling water in the cylinder body to directly enter between the adjacent piston holes through the upper water inlet. When the cooling water flows out from the upper water inlet, it diffuses between the adjacent intake channels and the adjacent exhaust channels. The baffle and the return water area cooperate to guide the flow of cooling water and prevent the cooling water from being excessively concentrated in a certain area or forming a short circuit, thereby ensuring that the cooling water can circulate in the entire cooling water channel, and the area between the adjacent intake channels and the area between the adjacent exhaust channels are included in the overall circulation of the cooling water channel. By improving the uniformity of cooling, the temperature difference between various parts of the cylinder head is reduced, and the thermal stress is reduced. Thermal stress is one of the main causes of cylinder head cracking, deformation and other failures. Reducing thermal stress can significantly improve the reliability of the cylinder head and extend the service life of the cylinder head. Uniform cooling can also reduce the wear of components such as pistons, cylinder walls, intake valves of the intake channel and exhaust valves of the exhaust channel, thereby extending the overall service life of the engine.

[0009] Preferably, a first screw hole column is provided on the cylinder head, the first screw hole column is located in the wall surface of the cylinder head and between adjacent exhaust passages, and the baffle is connected to the first screw hole column. The baffle and the first screw hole column are arranged in combination, and the two can rely on each other, and can ensure the setting strength of the baffle, and at the same time can improve the structural strength of the first screw hole column. The first screw hole column is used to realize the bolt connection between the cylinder head and the cylinder body, and the position is determined. The baffle is arranged in conjunction with the first screw hole column, which can facilitate the design of the length, inclination angle, etc. of the baffle.

[0010] Preferably, the cylinder head is provided with a second screw hole column, which is located in the wall of the cylinder head and between adjacent intake channels, and a groove is provided on one side of the second screw hole column. The groove is one of the ways to form the return water area, which can promote the water circulation in the cooling water channel. The second screw hole column is used to realize the bolt connection between the cylinder head and the cylinder body, and the position is determined. The groove is arranged in conjunction with the second screw hole column, which is easy to design, and the strength of the groove position is guaranteed.

[0011] Preferably, a guide plate is provided between the other side of the second screw hole column and the outer wall of the adjacent air inlet channel. When the groove and the guide plate are used in combination, the space where the groove is located is relatively open when water is supplied from the water inlet, and the water flows into the groove first, and then flows out of the groove and diffuses through the guide plate to the return water area and between the adjacent exhaust channels, thereby improving the cooling efficiency of the adjacent air inlet channels and the adjacent exhaust channels. The guide plate is set based on the position of the second screw hole column, which is convenient for designing the angle and position, and has a reliable guide effect.

[0012] Preferably, the side of the guide plate facing the upper water inlet is inclined relative to the plane where the axes of the two piston holes are located. The water flow directly directed to the guide plate can collide and reflect on the guide plate and diffuse along the guide plate to ensure the cooling effect of the water flow.

[0013] Preferably, the first screw hole column is located in the middle position between adjacent exhaust channels, and the side of the first screw hole column facing the upper water inlet is a cylindrical arc surface and intersects with the outer wall surface of the exhaust channel at an acute angle. The first screw hole column is arranged at this position so that both adjacent exhaust channels can be reliably locked. The side of the first screw hole column expands toward the upper water inlet and intersects with the outer wall surface of the exhaust channel, which strengthens the structure of the exhaust channel. Because the side surface forms an acute angle with the outer wall surface of the exhaust channel, the cooling water flows along the baffle and impacts the side of the first screw hole column, and then diffuses into the acute angle, thereby obtaining a reliable heat dissipation effect. The first screw hole column and the outer wall surface of the exhaust channel intersect at an acute angle. When the exhaust channel is vibrated and the vibration is transmitted to the acute angle area, the vibration of the water body in the acute angle area is strong, and the cooling efficiency is high.

[0014] Preferably, the outer wall of the exhaust channel is provided with a convex portion extending toward the upper water inlet, the convex portion, the outer wall of the exhaust channel and the water baffle form a water stop zone, the guide plate is connected to the outer wall of an air inlet channel, and the outer wall of the air inlet channel connected to the guide plate is provided with a water guide surface extending toward the water stop zone. The setting of the convex portion shapes the water stop zone. Under normal circumstances, there is less convection between the water body in the water stop zone and the water body outside the water stop zone. However, when water is supplied from the upper water inlet and the water body is guided by the water guide surface, the water flows into the water stop zone to realize convective heat exchange. The cooperation of the water guide surface and the water stop zone can effectively improve the heat exchange capacity of the area and improve the heat dissipation uniformity.

[0015] As a preferred embodiment, the fluid guided by the water guide surface flows to the water stop area after passing through the upper water inlet, thereby ensuring heat exchange between the water body inside the water stop area and the water body outside, and improving the heat dissipation uniformity of the cylinder head.

[0016] Preferably, the axes of the baffle plate, the upper water inlet and the second screw hole column are coplanar and the plane where the three are located is perpendicular to the plane where the axis of the piston hole is located. The plane where the baffle plate, the upper water inlet and the second screw hole column are located divides the area between two adjacent piston holes, plays a role in convective heat dissipation in both partitions, and ensures reliable cooling of the two adjacent piston holes.

[0017] A V-shaped engine includes the above-mentioned engine cylinder head and a cylinder body, the cylinder body is provided with two groups of pistons arranged side by side, the cylinder head is provided with two pistons in coordination with the two groups of pistons, each cylinder head is provided with two piston holes, the cylinder body is provided with a main water channel connected to the cooling water channel in the cylinder head, and the main water channel is connected to the upper water inlet. The V-shaped engine disclosed in the present application is subjected to a more uniform cooling effect and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a V-shaped engine disclosed in one embodiment of the present invention.

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure in the direction inside the cylinder block.

[0020] Figure 3 It is a schematic structural diagram of an engine cylinder head combined with a cylinder head cover disclosed in one embodiment of the present invention.

[0021] Figure 4 It is a schematic structural diagram of the exhaust side of an engine cylinder head combined with a cylinder head cover disclosed in one embodiment of the present invention.

[0022] Figure 5 yes Figure 4 Cross-sectional view at AA in the middle.

[0023] Figure 6 yes Figure 5 Cross-sectional view at the middle BB.

[0024] Figure 7 yes Figure 5 Cross-sectional view at CC.

[0025] Figure 8 It is a schematic structural diagram of the exhaust side of an engine cylinder head combined with a cylinder head cover disclosed in one embodiment of the present invention.

[0026] In the figure: cylinder body 1, main water channel 11, through hole 12; Cylinder head 2, piston hole 201, intake channel 202, exhaust channel 203, cooling water channel 204, upper water inlet 205, baffle 206, guide plate 207, groove 208, water return area 209, first screw hole column 210, second screw hole column 211, convex part 212, water stop area 213, water guide surface 214; Cylinder head cover 3. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The terms "including" and "having" and any variations thereof in the specification and claims of the present invention are intended to cover non-exclusive inclusions. For example, a method or product comprising a series of technical features is not necessarily limited to those technical features clearly listed, but may also include other technical features that are not clearly listed and can be included in the method or product.

[0029] In the description of the present invention, it is necessary to understand that the technical features defined by the terms "first", "second" and the like with sequential concepts are only for the purpose of clearly describing the defined technical features so that the defined technical features can be clearly distinguished from other technical features, but do not represent such naming in actual implementation, and therefore cannot be understood as a limitation of the present invention.

[0030] Example 1 like Figures 1 to 8 As shown, an engine cylinder head with high cooling uniformity is arranged on the cylinder block 1 of the engine, and a plurality of groups of piston holes 201, intake channels 202 and exhaust channels 203 are arranged in the cylinder head 2. A cooling water channel 204 surrounding the outer sides of the piston holes 201, the intake channels 202 and the exhaust channels 203 is arranged in the cylinder head 2. The cylinder head 2 is provided with upper water inlets 205 between adjacent piston holes 201, and the cylinder head 2 is provided with baffle plates 206 extending from the upper water inlets 205 and spaced apart from the upper water inlets 205 between adjacent exhaust channels 203. The cylinder head 2 is provided with guide plates 207 and / or grooves 208 between adjacent intake channels 202 to form a water return area 209 matching the baffle plates 206.

[0031] The cylinder head 2 is assembled with the cylinder block 1 of the engine by bolts. The cylinder head 2 is connected with a cylinder head cover 3. A through hole 12 is provided in the cylinder block 1 to cooperate with the sliding of the piston. The piston hole 201 opens downward and is sealed and connected above the through hole 12 when the cylinder head 2 is connected with the cylinder block 1. The piston, the hole wall of the through hole 12 and the hole wall of the piston hole 201 form a combustion chamber. During the operation of the engine, the intake passage 202 takes air into the combustion chamber, and the exhaust passage 203 discharges the gas in the combustion chamber. The interior of the cylinder head 2, especially the piston hole 201 and the exhaust passage 203, The temperature near the channel 203 is high and needs to be cooled. In the prior art, a cooling channel is arranged inside the cylinder block 1 of the engine, a water pump connected to the cooling channel is arranged on the outer side wall of the cylinder block 1, and a cooling water channel 204 connected to the cooling channel is arranged in the cylinder head 2. The fluid in the cooling water channel 204 flows quickly from one end to the other end of the cylinder head 2, and the heat exchange efficiency between adjacent piston holes 201 and between adjacent exhaust channels 203 is poor, resulting in poor cooling uniformity of the cylinder head 2, and affecting the reliability of the cylinder head 2 and the overall service life of the engine.

[0032] The return water area 209 disclosed in this embodiment can be formed by guiding flow through a separate guide plate 207, or can be formed only by guiding flow through a groove 208, or can be formed by combining a guide plate 207 and a groove 208. The purpose of setting the return water area 209 is to guide the water between adjacent intake channels 202 to between adjacent exhaust channels 203, and the specific structural settings are all aimed at this goal.

[0033] In this embodiment, a water inlet 205 is arranged between adjacent piston holes 201 in the cylinder head 2. The water inlet 205 is located at the bottom of the cooling water channel 204. The water inlet 205 is connected to the cooling channel in the cylinder body 1. The cooling water in the cylinder body 1 can directly enter between adjacent piston holes 201 from the water inlet 205, thereby improving the heat dissipation efficiency between adjacent piston holes 201.

[0034] Furthermore, the present application sets a baffle 206 between adjacent exhaust channels 203, and sets a water return area 209 between adjacent air inlet channels 202. The convective heat exchange in the area between adjacent exhaust channels 203 includes at least the directly diffused water flowing out of the upper water inlet 205 and the indirectly diffused water returning from the water return area 209. The two parts of water and the water in the area between adjacent exhaust channels 203 perform sufficient convective heat exchange, thereby achieving reliable cooling of the area between adjacent exhaust channels 203. The baffle 206 can partition the area between adjacent exhaust channels 203, so that the channels between two adjacent exhaust channels 203 can avoid being cooled.

[0035] After adopting the solution of this embodiment, the area between adjacent intake channels 202 and the area between adjacent exhaust channels 203 are included in the overall circulation flow of the cooling water channel 204, and the temperature difference between various parts of the cylinder head 2 is reduced by improving the cooling uniformity, thereby reducing thermal stress. Thermal stress is one of the main causes of failures such as cracking and deformation of the cylinder head 2. Reducing thermal stress can significantly improve the reliability of the cylinder head 2 and extend the service life of the cylinder head 2. Uniform cooling can also reduce the wear of components such as the piston, cylinder wall, intake valve of the intake channel 202 and exhaust valve of the exhaust channel 203, thereby extending the overall service life of the engine.

[0036] Example 2 As one of the embodiments of the present invention, an engine cylinder head with high cooling uniformity is provided on a cylinder block 1 of the engine. Figures 3 to 7As shown, two groups of piston holes 201, two groups of intake channels 202 and two groups of exhaust channels 203 are provided in the cylinder head 2. A cooling water channel 204 is provided in the cylinder head 2 to surround the outside of the piston holes 201, the intake channels 202 and the exhaust channels 203. The cooling water channel 204 is connected to the cooling channel inside the cylinder body 1, and the cooling channel is connected to a water pump. The cylinder head 2 is provided with an upper water inlet 205 between adjacent piston holes 201. The upper water inlet 205 is connected to the cooling channel inside the cylinder body 1. The water body part of the cooling channel in the cylinder body 1 directly rushes into the cooling water channel 204 from the upper water inlet 205. The cylinder head 2 is provided with a baffle plate 206 extending from the upper water inlet 205 and spaced from the upper water inlet 205 between adjacent exhaust channels 203. The cylinder head 2 is provided with a guide plate 207 and a groove 208 between adjacent intake channels 202 to form a water return area 209 matching the baffle plate 206. The cylinder head 2 is provided with a first screw hole column 210, which is located in the wall of the cylinder head 2 and between adjacent exhaust passages 203, and the baffle 206 is connected to the first screw hole column 210. The cylinder head 2 is provided with a second screw hole column 211, which is located in the wall of the cylinder head 2 and between adjacent intake passages 202, and a guide plate 207 is provided on one side of the second screw hole column 211. The two ends of the guide plate are respectively connected to the intake passage and the second screw hole column to achieve overall structural reinforcement. The first screw hole column 210 and the second screw hole column 211 are arranged opposite to each other on both sides of the upper water inlet 205. When the cylinder head 2 and the cylinder body 1 are bolted, the screw holes in the first screw hole column 210 and the second screw hole column 211 are respectively matched with a bolt to achieve the bolt connection between the cylinder head 2 and the cylinder body 1. In order to ensure the reliability of the connection between the cylinder head 2 and the cylinder body 1, the plane where the first screw hole column 210 and the second screw hole column 211 are located is usually located in the middle of the adjacent piston hole 201. That is, the positions of the first screw hole column 210 and the second screw hole column 211 on the cylinder head 2 are relatively fixed. Figure 7 As shown, the cooling water channel 204 is located on the lower side of the upper ends of the first screw hole column 210 and the second screw hole column 211, that is, the height of the baffle 206 is lower than the upper end of the first screw hole column 210, and the bolt connection between the first screw hole column 210 and the second screw hole column 211 will not be disturbed by the baffle 206.

[0037] The baffle plate 206 and the first screw hole column 210 are arranged in combination, and the two can rely on each other, which can ensure the setting strength of the baffle plate 206 and improve the structural strength of the first screw hole column 210. The baffle plate 206 is arranged in conjunction with the first screw hole column 210, which can facilitate the design of the length and inclination angle of the baffle plate 206. The guide plate 207 is one of the ways to shape the return water area 209, which can promote the circulation of water in the cooling water channel 204. The guide plate 207 is arranged in conjunction with the second screw hole column 211, and the diversion direction is easy to design, and the strength of the guide plate 207 and the second screw hole column 211 can be improved.

[0038] The first screw hole column 210 is located in the middle position between the adjacent exhaust channels 203. The side of the first screw hole column 210 facing the upper water inlet 205 is a cylindrical arc surface and intersects with the outer wall of the exhaust channel 203 at an acute angle. The acute angle is provided with a rounded transition to avoid stress concentration. The first screw hole column 210 is arranged at this position to play a reliable locking role for both adjacent exhaust channels 203. The first screw hole column 210 expands toward the side of the upper water inlet 205 and intersects with the outer wall of the exhaust channel 203, which strengthens the structure of the exhaust channel 203. Because the side is at an acute angle with the outer wall of the exhaust channel 203, the cooling water flows along the baffle 206 and impacts the side of the first screw hole column 210, and then diffuses into the acute angle, thereby obtaining a reliable heat dissipation effect. The first screw hole column 210 intersects with the outer wall of the exhaust channel 203 at an acute angle. When the exhaust channel 203 is vibrated, when the vibration is transmitted to the acute angle area, the vibration of the water body in the acute angle area is strong, and the cooling efficiency is high.

[0039] In this embodiment, a groove 208 is provided between the other side of the second screw hole column 211 and the outer wall surface of the adjacent air inlet channel 202. In this embodiment, the groove 208 and the guide plate 207 are combined as the water return area 209. When the water is supplied from the upper water inlet 205, the space where the groove 208 is located is relatively open, and the water flow enters the groove 208 first, and then the water flow flows out of the groove 208 and spreads through the guide plate 207 to the water return area 209 and between the adjacent exhaust channels 203, thereby improving the cooling efficiency of the opposite side walls of the adjacent exhaust channels 203. The groove 208 and the guide plate 207 are used at the same time, so that the areas on both sides of the second screw hole column 211 have different degrees of fullness, and the water flow will passively form a unidirectional flow trend when flowing to the area between the adjacent air inlet channels 202, so that the water supplied from the upper water inlet 205 circulates in the area between the adjacent air inlet channels 202 and the area between the adjacent exhaust channels 203.

[0040] In order to further improve the cooling rate of the cooling water flow between adjacent exhaust channels 203, it can be understood by those skilled in the art that the side of the guide plate 207 facing the upper water inlet 205 is inclined relative to the plane where the axes of the two piston holes 201 are located. The fluid guided by the water guide surface 214 flows to the water stop area 213 after passing through the upper water inlet 205. Exemplarily, the axes of the baffle plate 206, the upper water inlet 205 and the second screw hole column 211 are coplanar and the planes where the three are located are perpendicular to the plane where the axes of the piston holes 201 are located. In this embodiment, the planes where the baffle plate 206, the upper water inlet 205 and the second screw hole column 211 are located divide the area between the two adjacent piston holes 201, and both partitions play a role in convective heat dissipation, ensuring reliable cooling of the two adjacent piston holes 201. The water flow directly directed to the guide plate 207 can be guided and diffused along the guide plate 20 to ensure the cooling effect of the water flow.

[0041] In such Figure 8In the illustrated embodiment, the difference from Embodiment 2 is that a second screw hole column 211 is provided on the cylinder head 2 of this embodiment, the second screw hole column 211 is located in the wall of the cylinder head 2 and between adjacent intake passages 202, a groove 208 is provided on one side of the second screw hole column 211, and no guide plate is provided on the other side of the second screw hole column 211, and a water return area is formed only by the groove 208.

[0042] Example 3 As one of the embodiments of the present invention, an engine cylinder head with high cooling uniformity is provided on a cylinder block 1 of the engine. Figures 3 to 7As shown, two groups of piston holes 201, two groups of intake channels 202 and two groups of exhaust channels 203 are provided in the cylinder head 2. A cooling water channel 204 is provided in the cylinder head 2 to surround the outside of the piston holes 201, the intake channels 202 and the exhaust channels 203. The cooling water channel 204 is connected to the cooling channel inside the cylinder body 1, and the cooling channel is connected to a water pump. The cylinder head 2 is provided with an upper water inlet 205 between adjacent piston holes 201. The upper water inlet 205 is connected to the cooling channel inside the cylinder body 1. The water body part of the cooling channel in the cylinder body 1 directly rushes into the cooling water channel 204 from the upper water inlet 205. The cylinder head 2 is provided with a baffle plate 206 extending from the upper water inlet 205 and spaced from the upper water inlet 205 between adjacent exhaust channels 203. The cylinder head 2 is provided with a guide plate 207 and a groove 208 between adjacent intake channels 202 to form a water return area 209 matching the baffle plate 206. The cylinder head 2 is provided with a first screw hole column 210, which is located in the wall of the cylinder head 2 and between adjacent exhaust passages 203, and the baffle plate 206 is connected to the first screw hole column 210. The cylinder head 2 is provided with a second screw hole column 211, which is located in the wall of the cylinder head 2 and between adjacent intake passages 202, and a guide plate 207 is provided on one side of the second screw hole column 211. The outer wall of the exhaust passage 203 is provided with a convex portion 212 extending toward the upper water inlet 205, and the convex portion 212 can be used as a bolt setting position for connecting the cylinder head 2 and the cylinder body 1 or the cylinder head cover 3. The convex portion 212, the outer wall of the exhaust passage 203 and the baffle plate form a water stopping area 213, and the guide plate 207 is connected to the outer wall of an intake passage 202, and a water guide surface 214 extending toward the direction of the water stopping area 213 is provided on the outer wall of the intake passage 202 connected to the guide plate 207. Due to the setting of the protrusion 212, the distance between the upper water inlet 205 and the second screw hole column 211 is smaller than the distance between the upper water inlet 205 and the first screw hole column 210, so that the water from the upper water inlet 205 preferentially enters the return water area 209 between the adjacent air inlet channels 202. The setting of the protrusion 212 forms the water stop area 213. Under normal circumstances, there is less convection between the water in the water stop area 213 and the water outside the water stop area 213. However, when water is supplied from the upper water inlet 205 and the water is guided by the water guide surface 214, the water flows into the water stop area 213 to realize convective heat exchange. The cooperation between the water guide surface 214 and the water stop area 213 can effectively improve the heat exchange capacity of this area and improve the uniformity of heat dissipation.

[0043] It should be noted that the walls of the air intake channel 202 and the exhaust channel 203 are curved surfaces, and the diversion of the walls of the air intake channel 202 does not direct all water flows passing through the adjacent air intake channels 202 into the water retention area 213, but rather diverts part of the water into the water retention area 213 to form convection in the water retention area 213.

[0044] Example 4 One embodiment of the present invention discloses a V-shaped engine, such as Figures 1 to 7 As shown, the engine cylinder head 2 described in Example 3 is included, two groups of piston holes 201, two groups of intake channels 202 and two groups of exhaust channels 203 are provided in the cylinder head 2, and cooling water channels 204 surrounding the outside of the piston holes 201, the intake channels 202 and the exhaust channels 203 are provided in the cylinder head 2, and the cooling water channels 204 are connected to the cooling channels inside the cylinder body 1, and the cooling channels are connected to a water pump. The cylinder head 2 is provided with upper water ports 205 between adjacent piston holes 201, and the upper water ports 205 are connected to the cooling channels inside the cylinder body 1, and the water body part of the cooling channels in the cylinder body 1 is directly flushed into the cooling water channels 204 from the upper water ports 205. The cylinder head 2 is provided with a baffle plate 206 extending from the upper water inlet 205 and spaced apart from the upper water inlet 205 between adjacent exhaust passages 203, and a guide plate 207 and a groove 208 are provided between adjacent intake passages 202 to form a water return area 209 matching the baffle plate 206. The cylinder head 2 is provided with a first screw hole column 210, which is located in the wall of the cylinder head 2 and between adjacent exhaust passages 203, and the baffle plate 206 is connected to the first screw hole column 210. The cylinder head 2 is provided with a second screw hole column 211, which is located in the wall of the cylinder head 2 and between adjacent intake passages 202, and a guide plate 207 is provided on one side of the second screw hole column 211. The first screw hole column 210 and the second screw hole column 211 are arranged opposite to each other on both sides of the upper water inlet 205. When the cylinder head 2 and the cylinder body 1 are connected by bolts, the screw holes in the first screw hole column 210 and the second screw hole column 211 are respectively matched with a bolt to realize the bolt connection between the cylinder head 2 and the cylinder body 1. In order to ensure the reliability of the connection between the cylinder head 2 and the cylinder body 1, the plane where the first screw hole column 210 and the second screw hole column 211 are located is usually located at the center of the adjacent piston hole 201.

[0045] The first screw hole column 210 is located in the middle position between adjacent exhaust channels 203. The side of the first screw hole column 210 facing the upper water inlet 205 is a cylindrical arc surface and intersects with the outer wall of the exhaust channel 203 at an acute angle. The acute angle is provided with a rounded transition to avoid stress concentration. A groove 208 is provided between the other side of the second screw hole column 211 and the outer wall of the adjacent air inlet channel 202. The side of the guide plate 207 facing the upper water inlet 205 is inclined relative to the plane where the axes of the two piston holes 201 are located. The axes of the baffle plate 206, the upper water inlet 205 and the second screw hole column 211 are arranged in the same plane and the plane where the three are located is perpendicular to the plane where the axes of the piston holes 201 are located. The outer wall surface of the exhaust channel 203 is provided with a protrusion 212 extending toward the upward water inlet 205. The protrusion 212, the outer wall surface of the exhaust channel 203 and the water baffle form a water stopping area 213. The guide plate 207 is connected to the outer wall surface of an air intake channel 202. The outer wall surface of the air intake channel 202 connected to the guide plate 207 is provided with a water guide surface 214 extending toward the direction of the water stopping area 213.

[0046] The V-shaped engine also includes a cylinder body 1, a cylinder head 2 and the cylinder body 1 are fixedly connected, and a gasket is arranged between the cylinder head 2 and the cylinder body 1 and then fixed by bolts. The cylinder body 1 is provided with two groups of two pistons distributed side by side, and the cylinder head 2 is provided with two pistons to match the two groups of pistons. Two piston holes 201 are respectively provided on each cylinder head 2, and a main water channel 11 connected to the cooling water channel 204 in the cylinder head 2 is provided in the cylinder body 1, and the main water channel 11 is connected to the upper water inlet 205. The V-shaped engine disclosed in the present application is subjected to a relatively uniform cooling effect and has a long service life. The intake sides of the two cylinder heads 2 are arranged oppositely, which is convenient for the arrangement of the intake manifold. The air inlet of the intake channel 202 in the cylinder head 2 is arranged obliquely relative to the bottom surface of the cylinder head 2 where the gasket is arranged, and the air outlet of the air outlet channel is arranged parallel to the bottom surface of the cylinder head 2 where the gasket is arranged, and the air inlet and the air outlet are arranged at an angle in the direction away from the bottom surface. The cooling channel is located in the cylinder head 2 and surrounds the intake channel 202, the exhaust channel 203 and the piston hole 201. In this embodiment, the intake channel 202 and the exhaust channel 203 are respectively located on opposite sides of the piston hole 201, the intake channel 202 includes two branches, and the two branches correspond to the two sides of the piston hole 201, and the exhaust channel 203 also includes two branches corresponding to the two sides of the piston hole 201. The main water channel 11 is provided with a semi-enclosed shield at the flow channel hole corresponding to the upper water inlet 205, facing away from the direction of water flow, to ensure the water supply capacity of the upper water inlet 205.

[0047] When the water pump inlet water cools the cylinder body 1 through the main water channel 11, the water outlet from the upper water port 205 can reliably complete the cooling between adjacent piston holes 201 and adjacent exhaust channels 203, so that the cylinder head 2 has a more uniform cooling efficiency, thereby extending the overall service life of the engine.

Claims

1. An engine cylinder head with high cooling uniformity, arranged on the cylinder block of the engine, wherein a plurality of groups of piston holes, intake passages and exhaust passages are arranged in the cylinder head, wherein the cylinder head is characterized in that: The cylinder head is provided with a cooling water channel surrounding the outside of the piston hole, the intake channel and the exhaust channel. The cylinder head is provided with an upper water inlet between adjacent piston holes. The cylinder head is provided with a baffle extending from the upper water inlet and spaced from the upper water inlet between adjacent exhaust channels. The cylinder head is provided with a guide plate and / or a groove between adjacent intake channels to form a water return area matching the baffle.

2. The engine cylinder head with high cooling uniformity according to claim 1, characterized in that: The cylinder head is provided with a first screw hole column, which is located in the wall surface of the cylinder head and between adjacent exhaust channels, and the baffle is connected to the first screw hole column.

3. The engine cylinder head with high cooling uniformity according to claim 1, characterized in that: The cylinder head is provided with a second screw hole column, which is located in the wall surface of the cylinder head and between adjacent intake passages, and a groove is provided on one side of the second screw hole column.

4. The engine cylinder head with high cooling uniformity according to claim 3, characterized in that: A guide plate is connected between the other side of the second screw hole column and the outer wall surface of the air intake passage adjacent to the second screw hole column.

5. The engine cylinder head with high cooling uniformity according to claim 4, characterized in that: The side of the guide plate facing the water inlet is inclined relative to the plane where the axes of the two piston holes are located.

6. The engine cylinder head with high cooling uniformity according to claim 2, characterized in that: The first screw hole column is located in the middle position between adjacent exhaust channels, and the side of the first screw hole column facing the upper water inlet is a cylindrical arc surface and intersects with the outer wall surface of the exhaust channel at an acute angle.

7. An engine cylinder head with high cooling uniformity according to claim 4 or 5, characterized in that: The outer wall surface of the exhaust channel is provided with a convex portion extending toward the upper water inlet, the convex portion, the outer wall surface of the exhaust channel and the water baffle form a water stopping area, the guide plate is connected to the outer wall surface of an air intake channel, and the outer wall surface of the air intake channel connected to the guide plate is provided with a water guide surface extending toward the water stopping area.

8. The engine cylinder head with high cooling uniformity according to claim 7, characterized in that: The fluid guided by the water guide surface flows to the water stop area after passing through the upper water inlet.

9. An engine cylinder head with high cooling uniformity according to claim 3, 4 or 5, characterized in that: The axes of the baffle plate, the upper water inlet and the second screw hole column are coplanar and the plane where the three are located is perpendicular to the plane where the axis of the piston hole is located.

10. A V-shaped engine, characterized in that: The engine cylinder head comprises the engine cylinder head as described in any one of claims 1 to 9 above, and also comprises a cylinder body, the cylinder body is provided with two groups of two pistons distributed side by side, the cylinder head is provided with two pistons to match the two groups of pistons, each cylinder head is provided with two piston holes, a main water channel connected to the cooling water channel in the cylinder head is provided in the cylinder body, and the main water channel is connected to the upper water inlet.

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