Combustion systems and vehicles

Abstract

The present invention discloses a combustion system and a vehicle. The combustion system comprises: a cylinder head and a cylinder, a piston, an intake valve and an exhaust valve, and a spark plug. The piston is movably arranged in the cylinder, and a combustion chamber is defined between the piston, the cylinder head, and the cylinder. The intake valve is arranged in the cylinder head through an intake valve guide and is used to open and close the intake passage. The exhaust valve is arranged in the cylinder head through an exhaust valve guide and is used to open and close the exhaust passage. The spark plug is arranged in the cylinder head and extends into the combustion chamber, and is suitable for igniting the fuel mixture in the combustion chamber. gas combination; wherein, the cylinder head has an intake squeeze surface on one side adjacent to the intake valve, and an exhaust squeeze surface on the other side adjacent to the exhaust valve, the angle between the center line of the intake valve and the center line of the cylinder is b1, the angle between the center line of the exhaust valve and the center line of the cylinder is b2, the angle between the intake squeeze surface and the bottom surface of the cylinder head is a1, the angle between the exhaust squeeze surface and the bottom surface of the cylinder head is a2, and 0.5b1≤a1≤b1, 0.5b2≤a2≤b2, so as to improve ignition efficiency and combustion efficiency.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a combustion system and a vehicle. Background Art

[0002] In the prior art, the mainstream way to increase the combustion speed is to increase the turbulent kinetic energy of the fuel mixture in the combustion chamber at the time of ignition, which is generally achieved by increasing the tumble ratio of the intake duct or optimizing the combustion chamber.

[0003] However, the structural space of the cylinder head is limited, and it is difficult to increase the tumble ratio of the intake duct. Even if the tumble ratio is increased to the limit, the flow of fresh air to the limit will be accompanied by intake noise, misfire, and detonation. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a combustion system with higher combustion efficiency and lower probability of knock and misfire.

[0005] The present invention further provides a vehicle adopting the above combustion system.

[0006] According to a first aspect of the present invention, a combustion system comprises: a cylinder head and a cylinder, a piston, an intake valve and an exhaust valve, and a spark plug. The piston is movably arranged in the cylinder, and a combustion chamber is defined between the piston, the cylinder head, and the cylinder. The intake valve is arranged in the cylinder head through an intake valve guide and is used to open and close an intake passage. The exhaust valve is arranged in the cylinder head through an exhaust valve guide and is used to open and close an exhaust passage. The spark plug is arranged in the cylinder head and extends into the combustion chamber and is suitable for igniting the fuel. The fuel-fuel mixture in the combustion chamber; wherein, the cylinder head has an intake squeeze surface on a side adjacent to the intake valve, and an exhaust squeeze surface on a side adjacent to the exhaust valve, the angle between the centerline of the intake valve and the centerline of the cylinder is b1, the angle between the centerline of the exhaust valve and the centerline of the cylinder is b2, the angle between the intake squeeze surface and the bottom surface of the cylinder head is a1, the angle between the exhaust squeeze surface and the bottom surface of the cylinder head is a2, and 0.5b1≤a1≤b1, 0.5b2≤a2≤b2.

[0007] According to the combustion system of the embodiment of the present invention, by making 0.5b1≤a1≤b1, 0.5b2≤a2≤b2, it is ensured that the angle between the intake squeeze surface and the bottom surface of the cylinder head, and the angle between the exhaust squeeze surface and the cylinder head are more reasonable, so that the vaporized fuel and the fresh air can be mixed quickly and fully to improve the combustion efficiency, and the flow smoothness of the fuel mixture can be improved, the fluid environment in the combustion chamber can be improved, and the fuel mixture can be distributed more evenly to improve the ignition efficiency.

[0008] According to some embodiments of the present invention, the angle a1 between the intake squeeze surface and the bottom surface of the cylinder head is in the range of 10° to 15°, and the angle a2 between the exhaust squeeze surface and the bottom surface of the cylinder head is in the range of 13° to 17°.

[0009] In some embodiments, the cylinder head further has a bottom side air squeezing surface, and the distance between the bottom side air squeezing surface and the bottom surface of the cylinder head is ≤5 mm.

[0010] Furthermore, the cylinder head further comprises: a lateral extrusion surface adjacent to the intake extrusion surface and the exhaust extrusion surface, the included angle between the lateral extrusion surface and the bottom surface of the cylinder head is a3, and a1≤a3≤a2.

[0011] According to some embodiments of the present invention, a shielding portion is further provided on one end of the air intake passage communicating with the combustion chamber.

[0012] Further, a side of the shielding portion adjacent to the center of the cylinder is defined as a starting point of the shielding portion, and a side of the shielding portion away from the center of the cylinder is defined as an end point of the shielding portion. There are two intake valves, and an angle between a line connecting the starting point of the shielding portion and the midpoint of the intake valve where the shielding portion is located and a line connecting the midpoints of the two intake valves is a4. An angle between a line connecting the end point of the shielding portion and the midpoint of the intake valve where the shielding portion is located and a line connecting the midpoints of the two intake valves is a5. 0.1b1≤a4≤b1, 0.1b1≤a5≤b1.

[0013] Further, the shielding portion includes: a first shielding portion area, a second shielding portion area and a third shielding portion area which are arranged around the intake duct, the first shielding portion area is adjacent to the center line between the two intake valves, the second shielding portion area is away from the center line between the two intake valves, the third shielding portion area is located between the first shielding portion area and the second shielding portion area, the angle between the first shielding portion area and the perpendicular line of one end of the shielding portion adjacent to the spark plug is a6, and the angle formed by the center line of the intake valve and the exhaust valve located on the same side and the center line of the two intake valves is a7, 0.5a7≤a6≤a7, wherein 80°≤a7≤130°.

[0014] Furthermore, the fitting areas of the two first areas of the shielding parts define a middle area of ​​the shielding parts, and the angle between the first area of ​​the shielding parts and the middle area of ​​the shielding parts is a8, and b1≤a8≤2b1.

[0015] Further, the diameter of the disk portion of the intake valve is D1, the diameter of the shielding portion is D2, the distance between the first area of ​​the shielding portion and the middle area of ​​the shielding portion is L1, and D1-D2≤L1≤0.5D1.

[0016] A vehicle according to an embodiment of the second aspect of the present invention comprises: the combustion system described in the above embodiment.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of a combustion system according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 Schematic cross-sectional view of the midline AA;

[0021] Figure 3 yes Figure 1 Schematic cross-sectional view of midline BB;

[0022] Figure 4 yes Figure 1 Schematic cross-sectional view of the midline CC;

[0023] Figure 5 is another schematic diagram of a combustion system according to an embodiment of the present invention;

[0024] Figure 6 4 is a schematic cross-sectional view of a cylinder head of a combustion system according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] Combustion system 100,

[0027] Cylinder head 10, intake passage 11, exhaust passage 12, intake squeeze surface 13, exhaust squeeze surface 14, bottom squeeze surface 15, lateral squeeze surface 16,

[0028] Intake valve 20, exhaust valve 30,

[0029] The shielding part 40, the shielding part starting point 41, the shielding part end point 42, the shielding part first area 43, the shielding part second area 44, the shielding part third area 45, the shielding part middle area 46,

[0030] Spark plug 50,

[0031] Combustion chamber P. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] Reference below Figure 1-Figure 6 A combustion system 100 and a vehicle according to an embodiment of the present invention are described.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the combustion system 100 according to the first embodiment of the present invention includes: a cylinder head 10 and a cylinder (not shown in the figure), a piston (not shown in the figure), an intake valve 20 and an exhaust valve 30, and a spark plug 50.

[0035] Among them, the spark plug 50 is arranged in the area between the exhaust valve 30 and the intake valve 20, close to the center position of the cylinder head 10, and the spark plug 50 is preferably arranged vertically to the bottom surface of the cylinder head 10, which is beneficial to the utilization of the ignition energy of the spark plug 50 and facilitates the transmission of the electric spark generated by the electrode of the spark plug 50 to the combustion chamber P.

[0036] The piston is movably arranged in the cylinder, and a combustion chamber P is defined between the piston, the cylinder head 10 and the cylinder. The intake valve 20 is arranged in the cylinder head 10 through an intake valve guide and is used to open and close the intake passage 11. The exhaust valve 30 is arranged in the cylinder head 10 through an exhaust valve guide and is used to open and close the exhaust passage 12. The spark plug 50 is arranged in the cylinder head 10 and extends into the combustion chamber P, and is suitable for igniting the fuel mixture in the combustion chamber P.

[0037] Specifically, the spark plug 50 moves between the top dead center and the bottom dead center, and cooperates with the opening and closing of the intake valve 20, the ignition of the spark plug 50, and the opening and closing of the exhaust valve 30, and moves between the four strokes of intake, compression, power, and exhaust. In the power stroke, the piston is at or near the top dead center position, and the spark plug 50 generates an electric spark to ignite the fuel mixture in the combustion chamber P.

[0038] It should be pointed out that the intake valve 20 can be installed on the cylinder head 10 through an intake valve guide, the exhaust valve 30 can be installed on the cylinder head 10 through an exhaust valve guide, and the intake valve 20 even has an intake valve seat at one end adjacent to the combustion chamber P, and the exhaust valve 30 has an exhaust valve seat at one end adjacent to the combustion chamber P.

[0039] Furthermore, the cylinder head 10 has an intake squeeze surface 13 on the side adjacent to the intake valve 20, and an exhaust squeeze surface 14 on the side adjacent to the exhaust valve 30, the included angle between the center line of the intake valve 20 and the center line of the cylinder is b1, the included angle between the center line of the exhaust valve 30 and the center line of the cylinder is b2, the included angle between the intake squeeze surface 13 and the bottom surface of the cylinder head 10 is a1, the included angle between the exhaust squeeze surface 14 and the bottom surface of the cylinder head 10 is a2, and 0.5b1≤a1≤b1, 0.5b2≤a2≤b2 (see Figure 2 and Figure 3 shown).

[0040] That is to say, multiple intake valves 20 and multiple exhaust valves 30 can be set on the cylinder head 10, and an intake squeeze surface 13 is defined between the multiple intake valves 20, and an exhaust squeeze surface 14 is defined between the multiple exhaust valves 30 (for example: two intake valves 20 and two exhaust valves 30), and the intake valves 20, the exhaust valves 30, the intake squeeze surface 13 and the exhaust squeeze surface 14 define the "intake and exhaust squeeze surface" of the combustion chamber P. By limiting the angle a1 and the angle a2 within the above-mentioned angle range, it can be ensured that the angle between the intake squeeze surface 13 and the bottom surface of the cylinder head 10, and the angle between the exhaust squeeze surface 14 and the cylinder head 10 are more reasonable, which can improve the flow smoothness of the fuel mixture in the combustion chamber P part defined by the cylinder head 10, and can limit the relative position of the exhaust squeeze surface 14 and the wall of the combustion chamber P part defined by the piston, thereby ensuring sufficient mixing of fresh air and vaporized fuel.

[0041] According to the combustion system 100 of the embodiment of the present invention, by making 0.5b1≤a1≤b1, 0.5b2≤a2≤b2, it is ensured that the angle between the intake squeeze surface 13 and the bottom surface of the cylinder head 10, and the angle between the exhaust squeeze surface 14 and the cylinder head 10 are more reasonable, so that the vaporized fuel and the fresh air can be mixed quickly and fully to improve the combustion efficiency, and the flow smoothness of the fuel mixture can be improved, the fluid environment in the combustion chamber P can be improved, and the fuel mixture can be distributed more evenly to improve the ignition efficiency.

[0042] It should be pointed out that the combustion system 100 of the present invention is applied to an engine, and the number of combustion systems 100 corresponds to the number of cylinders of the engine. For example, a single-bar engine has one combustion system 100 according to an embodiment of the present invention, and a double-bar engine has four combustion systems 100 according to an embodiment of the present invention.

[0043] like Figure 3 As shown, according to some embodiments of the present invention, the angle a1 between the intake squeeze surface 13 and the bottom surface of the cylinder head 10 is in the range of 10° to 15°, and the angle a2 between the exhaust squeeze surface 14 and the bottom surface of the cylinder head 10 is in the range of 13° to 17°.

[0044] In this way, the exhaust squeeze surface 14 and the intake squeeze surface 13 can be made closer to the bottom surface of the cylinder head 10, so that the fuel mixture in the cylinder can converge to the center of the cylinder, and more fuel mixture can be gathered around the electrode of the spark plug 50, which can reduce the transmission path of the electric spark generated by the spark plug 50, facilitate rapid ignition of the fuel mixture, and improve combustion efficiency.

[0045] It should be pointed out that the electrode of the spark plug 50 extends into the partial combustion chamber P defined by the cylinder head 10, and the midpoint of the center electrode of the spark plug 50 and the ground electrode on the axis is defined as the electrode center. The initial ignition area of ​​the spark plug 50 is within a virtual sphere with the electrode center as the sphere center, so that the fuel mixture gathers around the electrode, that is, gathers within the range of the virtual sphere.

[0046] like Figure 5 As shown, in some embodiments, the cylinder head 10 further has a bottom side squeezing surface 15, and the distance between the bottom side squeezing surface 15 and the bottom surface of the cylinder head 10 is ≤5 mm.

[0047] Among them, the cylinder head 10 is arranged above the cylinder and is generally annular, and a bottom squeezing surface 15 is arranged on the circumferential side of the ring, which is farther away from the cylinder than the intake squeezing surface 13 and the exhaust squeezing surface 14, and the distance between the bottom squeezing surface 15 and the bottom surface of the cylinder head 10 is within 5 mm. The distance is more reasonable, which can reduce the fuel mixture acting on the cylinder wall and encourage more fuel mixture to participate in the turbulent flow in the cylinder, so as to further increase the turbulent kinetic energy, increase the turbulence intensity, and improve the combustion efficiency.

[0048] Furthermore, the cylinder head 10 further includes: a lateral squeezing surface 16 adjacent to the intake squeezing surface 13 and the exhaust squeezing surface 14, the included angle between the lateral squeezing surface 16 and the bottom surface of the cylinder head 10 is a3, and a1≤a3≤a2.

[0049] Exemplarily, two intake valves 20 are arranged on one side of the cylinder head 10, and two exhaust valves 30 are arranged on the other side of the cylinder head 10. An exhaust squeezing surface 14 is defined between the two exhaust valves 30, an intake squeezing surface 13 is defined between the two intake valves 20, and a lateral squeezing surface 16 is defined between the intake valve 20 and the exhaust valve 30 located at the same end. That is, there are two lateral squeezing surfaces 16 and they are arranged opposite to each other, and the angle between the lateral squeezing surface 16 and the bottom surface of the cylinder head 10 satisfies the angular relationship of a1≤a3≤a2, so that the distance between the lateral squeezing surface 16 and the center of the electrode can be more reasonable, so as to reduce the propagation path of the electric spark generated by the spark plug 50 and reduce the possibility of knocking in the combustion system 100.

[0050] like Figure 6As shown, according to some embodiments of the present invention, a shielding portion 40 is further provided on one end of the intake duct 11 connected to the combustion chamber P, that is, the shielding portion 40 is arranged below the intake duct 11, and the shielding portion 40 is located below the intake valve 20 seat, which can further increase the turbulence intensity in the cylinder.

[0051] exist Figure 5 In the illustrated embodiment, further, a side of the shielding portion 40 adjacent to the center of the cylinder is defined as a shielding portion starting point 41, and a side of the shielding portion 40 away from the center of the cylinder is defined as a shielding portion end point 42. There are two intake valves 20, and an angle between a line connecting the starting point 41 of the shielding portion and the midpoint of the intake valve 20 where the shielding portion 40 is located and a line connecting the midpoints of the two intake valves 20 is a4. An angle between a line connecting the end point 42 of the shielding portion and the midpoint of the intake valve 20 where the shielding portion 40 is located and a line connecting the midpoints of the two intake valves 20 is a5, and 0.1b1≤a4≤b1, and 0.1b1≤a5≤b1.

[0052] Preferably, a4=a5, and the above-mentioned angle relationship is satisfied, so that the matching effect between the intake squeeze surface 13 and the shielding portion 40, and the exhaust squeeze surface 14 and the shielding portion 40 can be better, and the matching design can be achieved, which can further improve the shielding effect of the shielding portion 40, so as to further improve the turbulence intensity in the cylinder and improve the tumble motion in the cylinder.

[0053] like Figure 5 and Figure 6 As shown, the shielding portion 40 includes: a first shielding portion area 43, a second shielding portion area 44 and a third shielding portion area 45 which are arranged around the intake duct 11, the first shielding portion area 43 is adjacent to the center line between the two intake valves 20, the second shielding portion area 20 is away from the center line between the two intake valves 20, the third shielding portion area 45 is located between the first shielding portion area 43 and the second shielding portion area 44, the angle between the first shielding portion area 43 and a perpendicular line (the perpendicular line is parallel to the extension direction of the intake valve seat) of the shielding portion 40 adjacent to one end of the spark plug 50 is a6, and the angle formed by the center line of the intake valve 20 and the exhaust valve 30 located on the same side and the center line of the two intake valves 20 is a7, 0.5a7≤a6≤a7, wherein 80°≤a7≤130°.

[0054] As a result, much of the airflow out of the intake valve 20 can flow to the vicinity of the spark plug 50 and be more concentrated in the center area of ​​the cylinder to improve combustion efficiency.

[0055] Furthermore, the fitting area of ​​the two first zones 43 of the shielding parts defines a middle zone 46 of the shielding part, the angle between the first zone 43 of the shielding part and the middle zone 46 of the shielding part is a8, b1≤a8≤2b1, the diameter of the disk portion of the intake valve 20 is D1, the diameter of the shielding part 40 is D2, the distance between the first zone 43 of the shielding part and the middle zone 46 of the shielding part is L1, D1-D2≤L1≤0.5D1.

[0056] As a result, the airflow out of the shielding portion 40 can flow more toward the electrode center area of ​​the spark plug 50 and more toward the center area of ​​the cylinder. Combined with the tumble movement in the cylinder, the tumble intensity in the cylinder is increased while more fuel mixture is gathered in the spark plug 50 area in the center of the cylinder, which makes it easier for the spark plug 50 to quickly ignite the fuel mixture in the cylinder, thereby improving combustion efficiency and reducing heat loss in the cylinder.

[0057] In summary, the present invention optimizes the squeezing surface structure on the cylinder head 10 and the structure of the combustion chamber P, guides the direction of the airflow, guides the flow of the fuel mixture in the cylinder, and reasonably configures the relative position of the spark plug 50 and the combustion chamber P. With the cooperation of the intake duct 11, the turbulent kinetic energy in the cylinder is effectively increased, the demand for high turbulent kinetic energy is met, the fuel mixture is effectively gathered around the spark plug 50, the transmission distance of the electric spark generated by the spark plug 50 is effectively controlled, the possibility of spontaneous combustion and detonation is reduced, the heat loss of the combustion system 100 is reduced, the utilization efficiency of the electric spark is effectively improved, the combustion speed of the fuel mixture is effectively improved, the combustion efficiency of the fuel mixture is effectively improved, the thermal efficiency of the engine is effectively improved, and the economy of the engine is effectively improved.

[0058] The vehicle according to the second aspect of the present invention comprises the combustion system 100 in the above embodiment, which can improve the riding comfort and driving stability of the vehicle and improve the fuel economy of the vehicle.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0061] In the description of the present invention, "plurality" means two or more.

[0062] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0063] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A combustion system, characterized in that: include: Cylinder head (10) and cylinder; A piston, the piston being movably disposed in the cylinder, and a combustion chamber (P) is defined between the piston, the cylinder head (10) and the cylinder; an intake valve (20) and an exhaust valve (30), wherein the intake valve (20) is arranged on the cylinder head (10) and is used to open and close the intake passage (11), and the exhaust valve (30) is arranged on the cylinder head (10) and is used to open and close the exhaust passage (12); a spark plug (50), the spark plug (50) being arranged on the cylinder head (10) and extending into the combustion chamber (P), and being suitable for igniting a fuel-fuel mixture in the combustion chamber (P); The cylinder head (10) has an intake squeeze surface (13) on a side adjacent to the intake valve (20), and an exhaust squeeze surface (14) on a side adjacent to the exhaust valve (30); there are multiple intake valves (20) and multiple exhaust valves (30), and the intake squeeze surface (13) is defined between the multiple intake valves (20), and the exhaust squeeze surface (14) is defined between the multiple exhaust valves (30); the included angle between the center line of the intake valve (20) and the center line of the cylinder is b1, and the center line of the exhaust valve (30) is The included angle with the center line of the cylinder is b2, the included angle between the intake squeeze surface (13) and the bottom surface of the cylinder head (10) is a1, the included angle between the exhaust squeeze surface (14) and the bottom surface of the cylinder head (10) is a2, and 0.5b1≤a1≤b1, 0.5b2≤a2≤b2, the included angle a1 between the intake squeeze surface (13) and the bottom surface of the cylinder head (10) is in the range of 10° to 15°, and the included angle a2 between the exhaust squeeze surface (14) and the bottom surface of the cylinder head (10) is in the range of 13° to 17°; A shielding portion (40) is also provided on one end of the intake passage (11) communicating with the combustion chamber (P); a side of the shielding portion (40) adjacent to the center of the cylinder is defined as a shielding portion starting point (41), and a side of the shielding portion (40) away from the center of the cylinder is defined as a shielding portion end point (42); there are two intake valves (20); an angle a4 is included between a line connecting the starting point of the shielding portion (41) and the midpoint of the intake valve (20) where the shielding portion (40) is located, and a line connecting the midpoints of the two intake valves (20); an angle a5 is included between a line connecting the midpoint of the intake valve (20) where the shielding portion (40) is located, and a line connecting the midpoints of the two intake valves (20); 0.1b1≤a4≤b1, 0.1b1≤a5≤b1; The shielding portion (40) comprises: a first shielding portion area (43), a second shielding portion area (44) and a third shielding portion area (45) arranged around the intake duct (11); the first shielding portion area (43) is adjacent to the center line between the two intake valves (20); the second shielding portion area (20) is away from the center line between the two intake valves (20); the third shielding portion area (45) is located between the first shielding portion area (43) and the second shielding portion area (44); the fitting area of ​​the two first shielding portion areas (43) defines a shielding portion middle area (46); the diameter of the disk portion of the intake valve (20) is D1, the diameter of the shielding portion (40) is D2, the distance between the first shielding portion area (43) and the shielding portion middle area (46) is L1, and D1-D2≤L1≤0.5D1.

2. The combustion system according to claim 1, characterized in that: The cylinder head (10) also has a bottom side air squeezing surface (15), and the distance between the bottom side air squeezing surface (15) and the bottom surface of the cylinder head (10) is ≤5 mm.

3. The combustion system according to claim 1, characterized in that: The cylinder head (10) further comprises: a lateral extrusion surface (16) adjacent to the intake extrusion surface (13) and the exhaust extrusion surface (14); the included angle between the lateral extrusion surface (16) and the bottom surface of the cylinder head (10) is a3, and a1≤a3≤a2.

4. The combustion system according to claim 1, characterized in that: The angle between the first area (43) of the shielding portion and the perpendicular line of one end of the shielding portion (40) adjacent to the spark plug (50) is a6, and the angle between the center line of the intake valve (20) and the exhaust valve (30) located on the same side and the center line of the two intake valves (20) is a7, 0.5a7≤a6≤a7, wherein 80°≤a7≤130°.

5. The combustion system according to claim 1, characterized in that: The angle between the first area (43) of the shielding portion and the middle area (46) of the shielding portion is a8, and b1≤a8≤2b1.

6. A vehicle, characterized in that: include: The combustion system according to any one of claims 1 to 5.

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