Four-valve engine cylinder head, four-valve engine and motorcycle

Abstract

The utility model relates to a four-valve engine cylinder head, a four-valve engine and a motorcycle. The four-valve engine cylinder head comprises a cylinder head shell, two exhaust ports and two air inlets are formed in one side of the cylinder head shell, the two exhaust ports correspondingly communicate with two exhaust passages, and the two air inlets correspondingly communicate with two air inlet passages; the common wall part between the two exhaust passages forms a first partition wall, second partition walls are formed between the air inlet passages and the exhaust passages, a cooling water cavity is formed in the cylinder head shell and separated from the air inlet passages and the exhaust passages through partition walls, the first partition wall is provided with a first water channel, and the second partition wall is provided with a second water channel. The first water channel and the second water channel extend from the cooling water cavity to a central part defined by the air inlet channel and the air outlet channel and are communicated with each other; a first water inlet hole is formed in the surface of the cylinder head shell. Cooling water can enter the first water channel and the second water channel to cool the first blocking wall and the second blocking wall, so that the first blocking wall is not prone to abrasion when matched with the air valve, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine components, in particular to a four-valve engine cylinder head, an engine and a motorcycle. BACKGROUND

[0002] A large amount of heat is generated during the operation of an engine. In order to ensure stable operation of the engine, the engine needs to be cooled. The existing cooling methods for the engine mainly include air cooling and water cooling. Air cooling mainly removes the heat generated by the heat generating parts of the engine through flowing gas. Water cooling removes the heat generated by the heat generating parts of the engine through direct contact between the liquid and the heat generating parts of the engine. With the development of vehicle engine technology, four-valve engine technology has emerged. Four valves usually have two exhaust valves and two intake valves. Compared with two-valve engines, the four valves can effectively improve the intake and exhaust efficiency of the engine, improve the fuel combustion efficiency, and provide stronger power. Four-valve engines usually use water cooling to cool.

[0003] In the related art, high-temperature gas generated in the cylinder of the engine is discharged through two exhaust valves and corresponding channels (exhaust passages) of the cylinder head. The valves are arranged in the exhaust passages to control the discharge of the gas. Water cavities or water grooves are arranged around the two exhaust valves and the two corresponding channels. Cooling water is introduced into the water cavities or water grooves to remove the heat at the two exhaust valves and the two corresponding channels.

[0004] However, in engine design, multiple cylinders are usually arranged in close proximity. Therefore, the exhaust valves and their corresponding exhaust passages are relatively close to each other. The two exhaust passages in the cylinder head are also arranged in close proximity. The connecting part between the two exhaust passages cannot be effectively cooled, resulting in a higher temperature at the connecting part between the two exhaust passages during engine operation. At this time, the movement of the valve in the exhaust passage makes the high-temperature position more prone to wear, thereby affecting the sealing between the exhaust passage and the valve and affecting the operation of the engine. CONTENT OF THE UTILITY MODEL

[0005] Therefore, it is necessary to provide a four-valve engine cylinder head, a four-valve engine and a motorcycle to solve the problem of poor heat dissipation, high temperature and easy wear caused by the cooperation of the valve in the connecting part between the adjacent exhaust passages on the engine cylinder head.

[0006] In one aspect, the application provides a four-valve engine cylinder head, which comprises a cylinder head shell, two exhaust ports and two intake ports are arranged on one side of the cylinder head shell, the two exhaust ports are arranged along a first direction, and the two intake ports are also arranged along the first direction; one of the exhaust ports is arranged side by side with one of the intake ports along a second direction, and the other exhaust port is arranged side by side with the other intake port along the second direction, and the first direction and the second direction are perpendicular to each other.

[0007] The cylinder head shell is internally provided with four airflow channels, the four airflow channels are in one-to-one correspondence with the two exhaust ports and the two intake ports, and the central region enclosed by the four airflow channels is referred to as a center portion, the airflow channels communicating with the exhaust ports are referred to as exhaust passages, and the airflow channels communicating with the intake ports are referred to as intake passages; a common wall portion between the two exhaust passages forms a first partition wall, the first partition wall separates the two exhaust passages, a second partition wall is formed between the exhaust passage and the intake passage adjacent in the second direction, and the second partition wall separates the adjacent intake passage and exhaust passage;

[0008] The cylinder head shell is internally provided with a cooling water cavity, and a partition wall is arranged between the cooling water cavity and the four airflow channels, and the partition wall separates the cooling water cavity and the airflow channels; the first partition wall is provided with a first water channel, the first water channel communicates with the cooling water cavity and extends to the center portion, and the second partition wall is provided with a second water channel, the second water channel communicates with the cooling water cavity and extends to the center portion and communicates with the first water channel;

[0009] The surface of the cylinder head shell is also provided with a first water inlet hole, the first water inlet hole communicates with the cooling water cavity, and the center line of the first water channel passes through the midpoint of the first water inlet hole.

[0010] In some embodiments, the diameter of the first water channel is smaller than the diameter of the second water channel.

[0011] In some embodiments, the surface of the cylinder head shell is also provided with a second water inlet hole, and the second water inlet hole communicates with the cooling water cavity.

[0012] In some embodiments, the four-valve engine cylinder head further comprises a first sealing member and a second sealing member, the first sealing member is arranged at the first water inlet hole, and the second sealing member is arranged at the second water inlet hole.

[0013] In some embodiments, the diameter of the first water channel is 3-5 mm, and the minimum wall thickness between the exhaust passage and the first water channel is 3-5 mm.

[0014] In some embodiments, the cylinder head of this four-valve engine also includes airflow ducts, of which four airflow ducts are provided, and the four airflow ducts are connected one-to-one with the four airflow channels, and the airflow channels are connected to the atmosphere through the airflow ducts.

[0015] In some embodiments, the cylinder head of this four-valve engine also includes a spark plug, and the side of the cylinder head housing with the exhaust port has a mounting hole, in which the spark plug is disposed.

[0016] In some embodiments, the cylinder head housing is made of aluminum.

[0017] On the other hand, this application also provides a four-valve engine, which includes the four-valve engine cylinder head as described above.

[0018] On the other hand, this application also provides a motorcycle that includes a four-valve engine as described above.

[0019] In the aforementioned four-valve engine cylinder head, the intake and exhaust ports are located on the same side of the cylinder head housing. Gases from the combustion chamber are discharged through the exhaust ports and exhaust passages, while external gases enter the combustion chamber through the intake passages and intake ports. The two exhaust ports and two intake ports are arranged side-by-side in pairs along the first and second directions, with the two exhaust ports and exhaust passages also adjacent to each other. This makes the overall structure of the four-valve engine cylinder head more compact. A first partition wall is formed between adjacent exhaust passages, and a second partition wall is formed between adjacent exhaust passages and intake passages, separating the airflow channels and making the overall structure more stable. The cooling water chamber is located inside the cylinder head housing, and the cooling water in the cooling water chamber contacts the partition walls, cooling the partition walls of the airflow channels. The first partition wall has a first water channel, allowing cooling water to enter and flow inside the partition wall, thus cooling it down. The second partition wall has a second water channel, allowing cooling water to enter and cool it down. The second water channel is connected to the first water channel, creating a circulating flow between the first and second water channels and the cooling water chamber, improving the cooling effect. The first water channel is correspondingly positioned to the first water inlet, ensuring that the cooling water entering the cylinder head housing through the first water inlet has an initial velocity towards the first water channel, facilitating its flow and improving the cooling effect on the first partition wall between the two exhaust ports. This configuration ensures a compact overall structure for the four-valve engine cylinder head while improving the heat dissipation of the first partition wall between the two exhaust ports, reducing valve wear on the inner wall of the exhaust ports, and extending the overall service life of the four-valve engine cylinder head, the four-valve engine, and the motorcycle. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the structure of a four-valve engine cylinder head housing with an exhaust port on one side, according to one embodiment of this application.

[0021] Figure 2 for Figure 1 Sectional view along the middle AA.

[0022] Figure 3 for Figure 2 Sectional view at the middle edge BB.

[0023] Figure 4 for Figure 3 Sectional view at the center CC.

[0024] In the figure, 100 is the cylinder head housing; 110 is the exhaust port; 120 is the air intake port; 130 is the center part; 140 is the first baffle wall; 141 is the first water channel; 150 is the second baffle wall; 151 is the second water channel; 160 is the cooling water chamber; 170 is the isolation wall; 180 is the first water inlet; 190 is the second water inlet; 200 is the airflow passage; 210 is the exhaust passage; 220 is the air intake passage; 230 is the common wall part; 300 is the airflow duct; and 400 is the mounting hole. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0031] See Figure 1 , Figure 2 and Figure 3 , Figure 1 This illustration shows a schematic diagram of the structure of a four-valve engine cylinder head in one embodiment of the present application, showing the side of the cylinder head housing 100 with the exhaust port 110. Figure 2 for Figure 1 Sectional view along the middle AA. Figure 3 forFigure 2 The sectional view at the center BB. It should be noted that the outer edge shape of the cylinder head housing 100 is not restricted. Figure 1 Only the positional relationship between the intake port 120, the exhaust port 110, and the mounting hole 400 is shown. The four-valve engine cylinder head includes a cylinder head housing 100. Two exhaust ports 110 and two intake ports 120 are provided on one side of the cylinder head housing 100. The two exhaust ports 110 are arranged along a first direction, and the two intake ports 120 are also arranged along the first direction. One exhaust port 110 is arranged side by side with one intake port 120 along a second direction, and the other exhaust port 110 is arranged side by side with the other intake port 120 along the second direction. The first direction and the second direction are perpendicular to each other.

[0032] The cylinder head housing 100 has four airflow channels 200 inside. The four airflow channels 200 are connected to two exhaust ports 110 and two intake ports 120 in a one-to-one correspondence. The middle area formed by the four airflow channels 200 is called the center part 130. The airflow channel 200 connected to the exhaust port 110 is called the exhaust passage 210, and the airflow channel 200 connected to the intake port 120 is called the intake passage 220. The common wall portion 230 between the two exhaust passages 210 forms a first partition wall 140, which separates the two exhaust passages 210. A second partition wall 150 is formed between the adjacent exhaust passages 210 and intake passages 220 along the second direction, which separates the adjacent intake passages 220 and exhaust passages 210.

[0033] The cylinder head housing 100 has a cooling water chamber 160 inside. Each cooling water chamber 160 is separated from the four airflow channels 200 by an isolation wall 170. The isolation wall 170 separates the cooling water chamber 160 from the airflow channels 200. The first partition wall 140 has a first water channel 141, which communicates with the cooling water chamber 160 and extends to the center 130. The second partition wall 150 has a second water channel 151, which communicates with the cooling water chamber 160 and extends to the center 130 to communicate with the first water channel 141.

[0034] The surface of the cylinder head housing 100 is also provided with a first water inlet hole 180, which is connected to the cooling water chamber 160. The extension line of the center line of the first water channel 141 passes through the midpoint of the first water inlet hole 180.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, the cooling water chamber 160 is formed inside the cylinder head housing 100, and the cooling water chamber 160 is used to contain cooling water. The exhaust port 110 and the intake port 120 are formed on the same side of the cylinder head housing 100, with the first direction being... Figure 1 The horizontal direction, the second direction is Figure 1In the vertical direction, two exhaust ports 110 are arranged side by side in the horizontal direction, and exhaust ports 110 and air inlets 120 are arranged side by side in the vertical direction. Four airflow channels 200 are arranged parallel to each other corresponding to exhaust ports 110 and air inlets 120. The first partition wall 140, the second partition wall 150, and the isolation wall 170 enclose and form two exhaust channels 210. The two exhaust channels 210 are separated by the first partition wall 140. The adjacent exhaust ports 110 and intake ports 120 in the vertical direction are separated by the second partition wall 150. The first water channel 141 is opened in the first partition wall 140, and the second water channel 151 is opened in the second partition wall 150. The second water channel 151 is connected to the first water channel 141. The cooling water in the cooling water chamber 160 flows into the first water channel 141 and the second water channel 151, so that the cooling water can flow through the first partition wall 140 and the second partition wall 150, thereby cooling the first partition wall 140 and the second partition wall 150.

[0036] like Figure 2 and Figure 3 As shown, preferably, the cooling water chamber 160 is the cavity area between the inner wall of the cylinder head housing 100 and the partition wall 170. Cooling water enters the cooling water chamber 160 through the first inlet hole 180. The first water channel 141 extends from the cooling water chamber 160 to the center portion 130 and penetrates the first partition wall 140 (i.e., the common wall portion 230 of the two exhaust channels 210). The second water channel 151 extends from the cooling water chamber 160 to the center portion 130 and penetrates the second partition wall 150. The cooling water entering the cooling water chamber 160 through the first inlet hole 180 has an initial velocity towards the first water channel 141. Therefore, the cooling water flows towards the first water channel 141 and returns to the cooling water chamber 160 through the second water channel 151. The cooling water forms a circulating flow in the first water channel 141 and the second water channel 151, which can continuously cool the first partition wall 140 and the second partition wall 150. The isolation wall 170 is in direct contact with the cooling water in the cooling water chamber 160. When there is cooling water in the cooling water chamber 160, the isolation wall 170 side of the exhaust duct 210 can be continuously cooled.

[0037] It should be noted that the common wall portion 230 of the two exhaust channels 210 mentioned above refers to, for example, Figure 2 and Figure 3 The area between the opposite sides of the two exhaust ducts 210 shown ( Figure 2 (The part separated by the dashed line). The central 130 refers to, for example... Figure 3 The area enclosed by the four airflow channels 200 shown is connected at the center 130 by the first waterway 141 and the second waterway 151.

[0038] The airflow passage 200 is connected to the outside air. During operation, the gases produced by fuel combustion in the engine cylinders are discharged through the exhaust passage 210, while outside air enters the cylinders through the intake passage 220. Cooling water is injected into the cooling water chamber 160 through the first water inlet 180. The cooling water entering the cooling water chamber 160 flows through the first water channel 141 and the second water channel 151, thereby lowering the temperature at the first baffle wall 140 and the second baffle wall 150. The cooling water in the cooling water chamber 160 contacts the isolation wall 170 of the exhaust passage 210, lowering the temperature at the isolation wall 170. Cooling water is continuously injected through the first water inlet 180 to maintain a low temperature around the exhaust passage 210.

[0039] With the above arrangement, the two exhaust ports 110 and the two intake ports 120 are located on the same side of the cylinder head housing 100, making the overall structure of the four-valve engine cylinder head compact. Cooling water can continuously enter the first water passage 141 to cool the common wall portion 230 between the two exhaust passages 210, making it less likely to cause wear on the inner wall of the exhaust passage 210 when the valves mate with it, thus improving service life.

[0040] In addition, a water outlet hole can be opened on the surface of the cylinder head housing 100, which is connected to the cooling water chamber 160. Preferably, the cooling water in the cooling water chamber 160 is discharged, and cooling water is continuously injected into the cooling water chamber 160 through the first water inlet hole 180 to continuously remove the heat from the cylinder head housing 100.

[0041] like Figure 3 As shown, in some embodiments, the diameter of the first waterway 141 is smaller than the diameter of the second waterway 151.

[0042] Since the first water channel 141 and the second water channel 151 extend towards the center 130 in different directions, and there is a certain angle between them, the flow rate of cooling water decreases when it flows from the first water channel 141 into the second water channel 151. Preferably, the diameter of the second water channel 151 is larger than the diameter of the first water channel 141. With the above arrangement, the cooling water in the first water channel 141 can be discharged through the second water channel 151, ensuring a continuous water flow in both the first and second water channels 141.

[0043] It should be noted that when the diameter of the first water channel 141 is the same as the diameter of the second water channel 151, the flow velocity of the cooling water will decrease after entering the second water channel 151 from the first water channel 141. That is, the flow velocity of the cooling water in the second water channel 151 is less than that in the first water channel 141, and the flow rate of the cooling water in the second water channel 151 is less than that in the first water channel 141. As a result, the flow rate of cooling water entering the first water channel 141 in the cooling water chamber 160 cannot be maintained at a reduced rate, thus reducing the cooling effect. When the diameter of the first water channel 141 is larger than the diameter of the second water channel 151, the flow velocity of the cooling water entering the first water channel 141 will also decrease, reducing the cooling effect.

[0044] In some embodiments, the surface of the cylinder head housing 100 is also provided with a second water inlet 190, which is connected to the cooling water chamber 160.

[0045] like Figure 3 As shown, preferably, the second water inlet 190 is located adjacent to the first water inlet 180. Multiple water inlets improve the efficiency of cooling water injection and increase the flow rate of cooling water into the cooling water chamber 160, thereby enhancing the cooling effect. Furthermore, while ensuring the cooling water flow rate, providing multiple water inlets allows the diameter of each individual water inlet to be smaller than that of a single water inlet. That is, the water flow rate provided by multiple small-diameter water inlets is the same as that provided by a large-diameter water inlet. By providing multiple smaller-diameter water inlets, the strength of the cylinder head shell 100 can be improved to a certain extent.

[0046] In some embodiments, the cylinder head of this four-valve engine further includes a first seal (not shown in the figure) and a second seal (not shown in the figure), the first seal being disposed at the first water inlet 180 and the second seal being disposed at the second water inlet 190.

[0047] See Figure 2 Preferably, the first sealing element is disposed at the first water inlet 180 or seals the passage between the first water inlet 180 and the cylinder head housing 100, so as to seal the first water inlet 180 and prevent the cooling water in the cooling water chamber 160 from flowing out through the first water inlet 180; similarly, the second sealing element is disposed at the second water inlet 190 or seals the passage between the second water inlet 190 and the cylinder head housing 100, so as to seal the second water inlet 190 and prevent the cooling water in the cooling water chamber 160 from flowing out through the second water inlet 190. After a certain volume of cooling water is injected into the cooling water chamber 160, the first water inlet 180 and the second water inlet 190 are sealed by the first sealing element and the second sealing element, so that the cooling water can fully cool the cylinder head housing 100 within the cooling water chamber 160.

[0048] In some embodiments, the diameter of the first water channel 141 is 3mm-5mm, and the minimum wall thickness between the exhaust channel 210 and the first water channel 141 is 3mm-5mm.

[0049] The diameter of the first water channel 141 can be 3mm, 4mm, or 5mm, and the minimum wall thickness between the exhaust channel 210 and the first water channel 141 can be 3mm, 4mm, or 5mm. Preferably, the diameter of the first water channel 141 is 3mm, and the wall thickness between the exhaust channel 210 and the first water channel 141 is 3mm. In this case, the thickness of the first partition wall 140 needs to be greater than 9mm (i.e., the sum of the diameter of the first water channel 141 and the wall thickness between the exhaust channels 210 on both sides of the first water channel 141 and the first water channel 141).

[0050] Regarding the above configuration, since the four-valve engine cylinder head is formed by sand casting, the cavity shape of the engine cylinder head is formed by casting sand and molding sand binder, followed by the pouring of molten metal. This casting method is a commonly used existing technology and will not be elaborated upon here. The position of the sand casting part corresponding to the first water channel 141 needs to be formed into a columnar structure with the same shape and diameter as the first water channel 141. When the diameter of the columnar structure is less than 3mm, the sand casting part cannot be formed. In this application, by setting the diameter of the first water channel 141 to 3mm, it is ensured that the sand casting part can normally form the shape of the first water channel 141 so that it can be manufactured. In addition, the minimum thickness of the first partition wall 140 does not exceed 15mm (that is, the diameter of the first water channel 141 is selected as 5mm, and the wall thickness between the exhaust port 210 and the first water channel 141 is 5mm). While ensuring that the sand casting part can be formed, the structure of the four-valve engine cylinder head is made more compact, so as to reasonably reduce the overall volume of the four-valve engine cylinder head.

[0051] It should be noted that the minimum wall thickness between the exhaust passage 210 and the first water passage 141 refers to the distance between the two closest points on the inner wall of the exhaust passage 210 and the inner wall of the first water passage 141, i.e., the thickness of the first partition wall 140 between the exhaust passage 210 and the first water passage 141 at its minimum thickness. A minimum wall thickness greater than 3mm ensures the strength of the first partition wall 140, preventing breakage during casting and use. A minimum wall thickness less than 5mm, while ensuring the strength of the first partition wall 140, allows for a more compact structure of the four-valve engine cylinder head, thus reasonably reducing its overall volume.

[0052] In some embodiments, the cylinder head of this four-valve engine also includes an airflow duct 300. There are four airflow ducts 300, and the four airflow ducts 300 are connected to four airflow channels 200 in a one-to-one correspondence. The airflow channels 200 are connected to the atmosphere through the airflow ducts 300.

[0053] like Figure 1 As shown, preferably, the four airflow ducts 300 are connected to the four airflow channels 200 in a one-to-one correspondence. One end of the airflow duct 300 is connected to the airflow channel 200, and the other end extends to the outside of the cylinder head housing 100 to communicate with the atmosphere. The exhaust gas generated by the combustion of fuel in the engine cylinder is discharged through the exhaust port 210 and the airflow duct 300 connected to the exhaust port 210. External air enters the cylinder through the airflow duct 300 connected to the intake port 220 and the intake port 220 to realize airflow exchange in the cylinder.

[0054] In some embodiments, the cylinder head of this four-valve engine also includes a spark plug (not shown in the figure), and the cylinder head housing 100 has a mounting hole 400 on the side where the exhaust port 110 is opened, and the spark plug is disposed in the mounting hole 400.

[0055] like ​ As shown, preferably, the mounting hole 400 is opened on the side of the cylinder head housing 100 where the air inlet 120 and the exhaust port 110 are opened, and the spark plug is disposed in the mounting hole 400 so that the structure of the cylinder head housing 100 is more compact.

[0056] In some embodiments, the cylinder head housing 100 is made of aluminum.

[0057] Preferably, the cylinder head housing 100 is made of cast aluminum. Compared with other materials, the cylinder head housing 100 made of cast aluminum is lighter in weight while having a certain strength, making it easier to handle, and has better thermal conductivity, which facilitates heat dissipation; in addition, aluminum has good ductility, which makes it easy to manufacture and process the cylinder head housing 100.

[0058] On the other hand, this application also provides a four-valve engine, which includes the four-valve engine cylinder head as described above.

[0059] Preferably, the four-valve engine includes a cylinder head assembly (not shown in the figure) and an engine housing with an open surface (not shown in the figure). The cylinder head assembly is located inside the engine housing, and the cylinder head cover is located at the opening of the engine housing. The cylinder head cover 100 has an intake port 120 and an exhaust port 110 facing the cylinder head assembly. Both the exhaust port 210 and the intake port 220 are connected to the cylinder head assembly, and the cylinder head assembly exchanges air with the outside atmosphere through the exhaust port 210 and the intake port 220. In addition, the cooling water chamber 160 is separated from the cylinder head assembly by the cylinder head cover 100, and the cooling water in the cooling water chamber 160 can simultaneously cool and lower the temperature of the cylinder head assembly.

[0060] On the other hand, this application also provides a motorcycle that includes a four-valve engine as described above.

[0061] Preferably, the motorcycle includes a four-valve engine, a frame, and wheels. Both the wheels and the four-valve engine are mounted on the frame, and the power output from the four-valve engine is sent to the wheels to drive the motorcycle. By incorporating a four-valve engine, the overall service life of the motorcycle can be increased while maintaining a relatively small overall size.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A four-valve engine cylinder head, characterized in that, The system includes a cylinder head housing, on one side of which are provided two exhaust ports and two intake ports. The two exhaust ports are arranged along a first direction, and the two intake ports are also arranged along the first direction. One of the exhaust ports is arranged side by side with one of the intake ports along a second direction, and the other exhaust port is arranged side by side with the other intake port along the second direction. The first direction and the second direction are perpendicular to each other. The cylinder head housing has four airflow channels inside, which are connected to two exhaust ports and two intake ports in a one-to-one correspondence. The central area formed by the four airflow channels is called the center. The airflow channel connected to the exhaust ports is called the exhaust channel, and the airflow channel connected to the intake ports is called the intake channel. The common wall portion between two exhaust channels forms a first partition wall, which separates the two exhaust channels. A second partition wall is formed between adjacent exhaust channels and intake channels along the second direction, which separates adjacent intake channels and exhaust channels. The cylinder head housing has a cooling water chamber inside, and a partition wall is provided between the cooling water chamber and the four airflow channels. The partition wall separates the cooling water chamber from the airflow channels. The first partition wall has a first water channel, which communicates with the cooling water chamber and extends to the center. The second partition wall has a second water channel, which communicates with the cooling water chamber and extends to the center, communicating with the first water channel. The surface of the cylinder head housing is also provided with a first water inlet hole, which is connected to the cooling water chamber, and the extension line of the center line of the first water channel passes through the midpoint of the first water inlet hole.

2. The four-valve engine cylinder head according to claim 1, characterized in that, The diameter of the first waterway is smaller than the diameter of the second waterway.

3. The four-valve engine cylinder head according to claim 2, characterized in that, The surface of the cylinder head housing is also provided with a second water inlet hole, which is connected to the cooling water chamber.

4. The four-valve engine cylinder head according to claim 3, characterized in that, It also includes a first seal and a second seal, the first seal being disposed at the first water inlet and the second seal being disposed at the second water inlet.

5. The four-valve engine cylinder head according to claim 1, characterized in that, The diameter of the first water channel is 3mm-5mm, and the minimum wall thickness between the exhaust channel and the first water channel is 3mm-5mm.

6. The four-valve engine cylinder head according to claim 1, characterized in that, It also includes airflow ducts, of which there are four, and the four airflow ducts are connected one-to-one with the four airflow channels, and the airflow channels are connected to the atmosphere through the airflow ducts.

7. The four-valve engine cylinder head according to claim 1, characterized in that, It also includes a spark plug, and the cylinder head housing has a mounting hole on the side where the exhaust port is located, and the spark plug is located in the mounting hole.

8. The four-valve engine cylinder head according to claim 1, characterized in that, The cylinder head housing is made of aluminum.

9. A four-valve engine, characterized in that, Including the four-valve engine cylinder head as described in any one of claims 1-8.

10. A motorcycle, characterized in that, Including the four-valve engine as described in claim 9.

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