Cylinder cover, engine and vehicle

Abstract

The utility model discloses a cylinder cover, an engine and a vehicle, the cylinder cover is provided with an intake valve and an exhaust valve which are distributed at an interval along a first direction, and the cylinder cover is provided with an arc-shaped guide surface and a combustion chamber gas guide surface which are sequentially distributed between the intake valve and the exhaust valve; the circle center of the combustion chamber gas guide face and the circle center of the arc-shaped guide face are both located below the air cylinder cover. According to the air cylinder cover, the tumble intensity in the combustion chamber can be improved through the arc-shaped guide face and the combustion chamber air guide face, the air inlet stability is improved, air flow in the combustion chamber can be mixed more evenly, combustion is more sufficient, oil consumption is reduced, and CO is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a cylinder head, an engine with the cylinder head and a vehicle with the engine. Background Art

[0002] In the related art, the cylinder head of the engine is provided with an intake valve and an exhaust valve, wherein the airflow outside the engine can enter the combustion chamber from the intake valve. However, the structure of the existing cylinder head makes the tumble of the airflow after entering the combustion chamber relatively low, which can easily lead to poor uniformity of the mixing of fuel and air in the combustion chamber, resulting in incomplete combustion of the fuel, which can easily cause an increase in fuel consumption and even increase the production of CO. There is room for improvement. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a cylinder head having an arcuate guide surface and a combustion chamber air guide surface that guide the airflow entering the intake valve to form a good tumble flow effect, thereby facilitating full combustion of the fuel and reducing engine fuel consumption.

[0004] According to the cylinder head of an embodiment of the present invention, the cylinder head is provided with an intake valve and an exhaust valve spaced apart along a first direction, and the cylinder head is formed with an arc-shaped guide surface and a combustion chamber air guide surface sequentially distributed between the intake valve and the exhaust valve, and the center of the combustion chamber air guide surface and the center of the arc-shaped guide surface are both located below the cylinder head.

[0005] According to the cylinder head of the embodiment of the present invention, by arranging an arc-shaped guide surface and a combustion chamber air guide surface between the intake valve and the exhaust valve, the arc-shaped guide surface and the combustion chamber air guide surface can be utilized to form an effective tumble effect between the intake valve and the exhaust valve, thereby increasing the tumble intensity in the combustion chamber and improving the intake stability, that is, making the airflow in the combustion chamber more evenly mixed, combustion more complete, reducing fuel consumption, and reducing CO production.

[0006] According to the cylinder head of some embodiments of the present invention, the distance between the center of the combustion chamber gas guide surface and the center of the arc-shaped guide surface in the vertical direction is A1, and the distance between the center of the combustion chamber gas guide surface and the center of the arc-shaped guide surface in the first direction is A2, and it satisfies: 2≤A1 / A2≤5.

[0007] According to some embodiments of the present invention, the cylinder head satisfies: 3≤A1 / A2≤4.

[0008] According to some embodiments of the cylinder head of the present invention, the cylinder head has a cylinder head bottom surface connected to the cylinder body, the distance from the center of the combustion chamber air guide surface to the cylinder head bottom surface is B1, the distance from the center of the arc-shaped guide surface to the cylinder head bottom surface is B2, and the following condition is satisfied: 0.1≤B1 / B2≤0.3.

[0009] According to some embodiments of the present invention, the cylinder head satisfies the following condition: 0.15≤B1 / B2≤0.25.

[0010] According to the cylinder head of some embodiments of the present invention, the edge of the combustion chamber air guide surface close to the intake valve is constructed as a first arc-shaped edge, and the edge of the combustion chamber air guide surface away from the intake valve is constructed as a second arc-shaped edge, and the angle range corresponding to the first arc-shaped edge is smaller than the angle range corresponding to the second arc-shaped edge.

[0011] According to some embodiments of the cylinder head of the present invention, the angle range corresponding to the first arcuate side is C1, the angle range corresponding to the second arcuate side is C2, and the following relationship is satisfied: 0.3≤C1 / C2≤0.7.

[0012] According to some embodiments of the present invention, the cylinder head satisfies the following condition: 0.4≤C1 / C2≤0.6.

[0013] According to the cylinder head of some embodiments of the present invention, the diameter of the combustion chamber gas guide surface is larger than the diameter of the arc-shaped guide surface.

[0014] According to the cylinder head of some embodiments of the present invention, the width of the combustion chamber air guide surface in the first direction is greater than the width of the arc-shaped guide surface in the first direction.

[0015] According to some embodiments of the cylinder head of the present invention, the surface roughness of the combustion chamber gas guide surface is Ra, and satisfies: 0.8 μm≤Ra≤1.6 μm.

[0016] The utility model also provides an engine.

[0017] An engine according to an embodiment of the present invention comprises a cylinder block and a cylinder head as described in any one of the above embodiments, wherein the cylinder head is connected to the top of the cylinder block, a cylinder hole is formed in the cylinder block, and a distance D between a center line of the cylinder hole and a center point of a circle of the combustion chamber gas guide surface is satisfied: 0<D<A1 / A2.

[0018] According to some embodiments of the engine of the present invention, the diameter of the combustion chamber air guide surface is E1, the diameter of the cylinder hole is E2, and they satisfy: 0.2≤E1 / E2≤0.6.

[0019] According to some embodiments of the present invention, the engine satisfies the following condition: 0.3≤E1 / E2≤0.5.

[0020] The utility model also provides a vehicle.

[0021] A vehicle according to an embodiment of the present invention includes the engine described in any one of the above embodiments.

[0022] The advantages of the vehicle, the engine and the cylinder head mentioned above are the same as those of the prior art and will not be described in detail here.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic structural diagram of a cylinder head according to an embodiment of the present utility model;

[0026] Figure 2 yes Figure 1 A partial enlarged view of the

[0027] Figure 3 is a cross-sectional view of a cylinder head according to an embodiment of the present invention;

[0028] Figure 4 Schematic diagram of tumble flow of a cylinder head according to an embodiment of the present invention when C1 / C2 is between 0.3 and 0.7;

[0029] Figure 5 Schematic diagram of tumble flow of a cylinder head according to an embodiment of the present invention when C1 / C2 is greater than 0.7;

[0030] Figure 6 is a relationship diagram between the tumble flow intensity and C1 / C2 of the cylinder head according to an embodiment of the present utility model;

[0031] Figure 7 It is a schematic diagram of the air intake of the cylinder head according to an embodiment of the present utility model.

[0032] Reference numerals:

[0033] Cylinder head 100,

[0034] Intake valve 1, transition arc surface 11, exhaust valve 2, arc guide surface 3, combustion chamber air guide surface 4, first arc edge 41, second arc edge 42, cylinder head bottom surface 5,

[0035] Cylinder bore 102. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "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. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] First of all, it should be noted that the traditional cylinder head is also provided with an intake valve and an exhaust valve, but the airflow at the intake valve enters the combustion chamber directly and directionally along the extension direction of the intake valve, so that the airflow velocity in the part of the combustion chamber that is opposite to the extension direction of the intake valve is large, while the airflow in other parts of the combustion chamber that are staggered with the extension direction of the intake valve is less affected by the airflow entering from the intake valve, that is, it is in a relatively stable state. This results in general airflow fluidity in local areas of the combustion chamber, poor fuel mixing uniformity in the combustion chamber, incomplete combustion, and excessive fuel consumption.

[0040] The present invention proposes a cylinder head 100, which can guide the airflow through the arc-shaped guide surface 3 and the combustion chamber air guide surface 4 during the intake process of the cylinder head 100, so as to form a strong tumble effect, which is conducive to increasing the tumble ratio, making the fuel and air in the engine mix more evenly, burning more completely, reducing fuel consumption, and improving the engine's working performance.

[0041] like Figure 1-Figure 7 As shown, according to the cylinder head 100 of the embodiment of the present invention, the cylinder head 100 is provided with an intake valve 1 and an exhaust valve 2 spaced apart along a first direction. The first direction is the horizontal direction, that is, the intake valve 1 and the exhaust valve 2 can be arranged to be spaced apart along the horizontal direction, so that the intake valve 1 and the exhaust valve 2 respectively play the role of intake and exhaust. Specifically, Figure 1 As shown, the first direction is Figure 1 In the up and down direction, the intake valve 1 and the exhaust valve 2 can be set to two, and the two intake valves 1 are along Figure 1 The two exhaust valves 2 are also arranged along the left and right directions. Figure 1 The two intake valves 1 and the two exhaust valves 2 are distributed in a one-to-one correspondence along the up-down direction.

[0042] Furthermore, the cylinder head 100 is formed with an arcuate guide surface 3 and a combustion chamber air guide surface 4, which are sequentially distributed between the intake valve 1 and the exhaust valve 2. That is, in a first direction, the intake valve 1, the arcuate guide surface 3, the combustion chamber air guide surface 4, and the exhaust valve 2 are sequentially distributed. Thus, when the engine takes in air through the intake valve 1, part of the airflow at the intake valve 1 can sequentially pass through the arcuate guide surface 3 and the combustion chamber air guide surface 4 toward the side where the exhaust valve 2 is located, and during this flow, it flows along the arcuate guide surface 3 and the combustion chamber air guide surface 4.

[0043] Among them, the center of the combustion chamber air guide surface 4 and the center of the arc-shaped guide surface 3 are both located below the cylinder head 100, that is, the combustion chamber air guide surface 4 and the arc-shaped guide surface 3 can both be constructed as arc-shaped surfaces, and the center of the combustion chamber air guide surface 4 is located below the cylinder head 100, so that the combustion chamber air guide surface 4 is formed by being concave upward on the lower surface of the cylinder head 100. Similarly, the center of the arc-shaped guide surface 3 is located below the cylinder head 100, so that the arc-shaped guide surface 3 is formed by being concave upward on the lower surface of the cylinder head 100, and the arc-shaped guide surface 3 intersects with the combustion chamber air guide surface 4.

[0044] As a result, the airflow at the intake valve 1 can flow in an arc shape when flowing along the arc-shaped guide surface 3, and can flow in an arc shape again after entering the combustion chamber air guide surface 4. That is, when the airflow passes through the arc-shaped guide surface 3 and the combustion chamber air guide surface 4 in sequence, it can form an arc-shaped tumble motion in two stages, thereby facilitating the tumble effect of the airflow after entering the combustion chamber. And, in the specific structure, such as Figure 7As shown, a transition arc surface 11 can be provided at the junction of the intake valve 1 and the arc-shaped guide surface 3 to allow the intake air flow to flow in smoothly.

[0045] According to the cylinder head 100 of the embodiment of the present invention, by arranging the arc-shaped guide surface 3 and the combustion chamber air guide surface 4 between the intake valve 1 and the exhaust valve 2, the arc-shaped guide surface 3 and the combustion chamber air guide surface 4 can be utilized to form an effective tumble effect between the intake valve 1 and the exhaust valve 2, thereby improving the tumble intensity in the combustion chamber and improving the intake stability, that is, making the airflow in the combustion chamber more evenly mixed, the combustion more complete, reducing fuel consumption, and reducing CO production.

[0046] In some embodiments, the distance between the center of the combustion chamber air guide surface 4 and the center of the arc guide surface 3 in the vertical direction is A1, and the distance between the center of the combustion chamber air guide surface 4 and the center of the arc guide surface 3 in the first direction is A2, and satisfies: 2≤A1 / A2≤5. In other words, the ratio of the distance between the center of the combustion chamber air guide surface 4 and the center of the arc guide surface 3 in the vertical direction and the distance between the center of the combustion chamber air guide surface 4 and the center of the arc guide surface 3 in the first direction is in the range of 2 to 5. Thus, the arc guide surface 3 and the combustion chamber air guide surface 4 can guide the airflow to produce different tumble effects.

[0047] Among them, A1 / A2 can be set to 2, 2.1, 2.4, 2.6, 2.9, 3.2, 3.5, 3.6, 3.7, 3.9, 4.4, 4.5, 4.6, 4.8, 4.9, 5, or other values ​​between 2 and 5. It should be noted that when the ratio A1 / A2 is less than 2, the tumble effects generated by the combustion chamber air guide surface 4 and the curved guide surface 3 are similar, resulting in a lower overall tumble effect. When the ratio A1 / A2 is greater than 5, the connection between the combustion chamber air guide surface 4 and the curved guide surface 3 is too abrupt, which is not conducive to the processing and forming of the two surfaces. Therefore, when the ratio A1 / A2 is set within the above range, it is not only conducive to improving the tumble effect generated by the combustion chamber air guide surface 4 and the curved guide surface 3 guiding the airflow, but also makes the structure of the combustion chamber air guide surface 4 and the curved guide surface 3 easier to form, thereby reducing the installation cost.

[0048] In a further embodiment, the following condition is satisfied: 3≤A1 / A2≤4, so as to achieve a better tumble flow effect formed by the combustion chamber air guide surface 4 and the arc-shaped guide surface 3. Specifically, A1 / A2 can be set to 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, or 4.

[0049] It should be noted that the closer the ratio of A1 / A2 is to a value between 3 and 4, the better the turbulence effect produced by the combustion chamber air guide surface 4 and the curved guide surface 3. Therefore, setting the ratio of A1 / A2 within the above range can make the combustion chamber air guide surface 4 and the curved guide surface 3 produce a stronger turbulence effect when the intake valve 1 takes in air, thereby improving the uniformity of the airflow mixing in the combustion chamber.

[0050] In some embodiments, the cylinder head 100 has a cylinder head bottom surface 5 connected to the cylinder block, such as Figure 3 As shown, the lower surface of the cylinder head 100 is configured as a cylinder head bottom surface 5 , and when the cylinder head 100 is connected to the cylinder block, the cylinder head bottom surface 5 , the cylinder block, and the piston together define a combustion chamber.

[0051] The distance from the center of the combustion chamber air guide surface 4 to the cylinder head bottom surface 5 is B1, and the distance from the center of the arc guide surface 3 to the cylinder head bottom surface 5 is B2, and they satisfy: 0.1≤B1 / B2≤0.3. Figure 3 As shown, the center of the combustion chamber gas guide surface 4 is K1, and the center of the arc guide surface 3 is K2. That is, the ratio of the distance between K1 and the cylinder head bottom surface 5 to the distance between K2 and the cylinder head bottom surface 5 is between 0.1 and 0.3. B1 / B2 can be set to 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, or 0.3. Alternatively, B1 / B2 can be set to other values ​​within the range of 0.1 to 0.3. In this way, the center of the combustion chamber air guide surface 4 can be made closer to the cylinder head bottom surface 5, and the arc-shaped guide surface 3 is comparatively further away from the cylinder head bottom surface 5, so that the combustion chamber air guide surface 4 and the arc-shaped guide surface 3 can present different tumble effects, which is beneficial to improving the intake efficiency.

[0052] In a further embodiment, the following is satisfied: 0.15≤B1 / B2≤0.25, thereby further enhancing the turbulence effect generated by the combustion chamber air guide surface 4 and the curved guide surface 3. Specifically, by setting B1 / B2 to 0.15, 0.16, 0.166, 0.17, 0.18, 0.19, 0.192, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, or to other values ​​within this range, the combustion chamber air guide surface 4 and the curved guide surface 3 are correspondingly set within this range of parameter relationships, so that the combustion chamber air guide surface 4 and the curved guide surface 3 can guide the airflow entering the intake valve 1 at different angles, and after guiding the airflow, the airflow can be well dispersed in the combustion chamber, forming a better mixed flow effect.

[0053] In some embodiments, as Figure 2As shown, the edge of the combustion chamber air guide surface 4 close to the intake valve 1 is constructed as a first arcuate edge 41, and the edge of the combustion chamber air guide surface 4 away from the intake valve 1 is constructed as a second arcuate edge 42, that is, the edges on both sides of the combustion chamber air guide surface 4 in the airflow direction are constructed as arcuate edges. Therefore, the airflow at the arcuate guide surface 3 can diffuse from the first arcuate edge 41 to diffuse to the entire combustion chamber air guide surface 4, and then diffuse at the second arcuate edge 42 to diffuse to the vicinity of the exhaust valve 2, which is conducive to the effective guidance of the airflow.

[0054] Furthermore, the angle range corresponding to the first arcuate edge 41 is set to be smaller than the angle range corresponding to the second arcuate edge 42 , which is beneficial to improving the tumbling effect of the airflow from the intake valve 1 to the exhaust valve 2 and facilitating more uniform mixing of the airflow.

[0055] In some embodiments, as Figure 3 As shown, the angle range corresponding to the first arc-shaped edge 41 is C1, and the angle range corresponding to the second arc-shaped edge 42 is C2, and the following conditions are satisfied: 0.3≤C1 / C2≤0.7. The ratio of the angle range corresponding to the first arc-shaped edge 41 to the angle range corresponding to the second arc-shaped edge 42 can be set between 0.3 and 0.7, such as 0.30, 0.31, 0.32, 0.34, 0.35, 0.37, 0.38, 0.39, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.50, 0.51, 0.52, 0.53, 0.54, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85 Alternatively, C1 / C2 can be set to other values ​​within the range of 0.3 to 0.7, which is beneficial for improving the tumble effect in the combustion chamber.

[0056] It should be noted that, Figure 6 As shown in FIG. 1 , when C1 / C2 is set to be greater than 0.7, the tumble flow intensity gradually decreases as C1 / C2 increases, while when C1 / C2 is set to be less than 0.3, the arrangement of the combustion structure of the cylinder head 100 is affected. Specifically, as Figure 4 As shown, when C1 / C2 is between 0.3 and 0.7, the airflow enters the inner side of the cylinder head 100 from above the valve. At this time, the airflow formed above the valve is the strongest, and the tumble flow is higher. Figure 5As shown in the figure, when C1 / C2 is greater than 0.7, the airflow passing over the valve decreases, weakening the airflow formed above the valve, thereby reducing the tumble intensity. Therefore, by setting C1 / C2 between 0.3 and 0.7, the tumble intensity can be enhanced, increasing the tumble ratio, making the engine mixture more uniform and combustion more complete, which helps reduce fuel consumption and CO production.

[0057] Furthermore, in a further embodiment, the following condition is satisfied: 0.4 ≤ C1 / C2 ≤ 0.6. That is, the ratio of the angle range corresponding to the first arcuate edge 41 to the angle range corresponding to the second arcuate edge 42 can be set to between 0.4 and 0.6, such as 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, or 0.6. Alternatively, C1 / C2 can be set to other values ​​within the range of 0.4 to 0.6, thereby facilitating an enhanced tumble effect within the combustion chamber.

[0058] As well as Figure 6 As shown in the figure, the relationship between C1 / C2 and the turbulence intensity in the combustion chamber is close to a normal distribution, and the closer C1 / C2 is to 0.5, the corresponding turbulence intensity is relatively the highest. Therefore, setting C1 / C2 within the range of 0.4 to 0.6 can make the turbulence effect in the combustion chamber significantly higher than the turbulence effects corresponding to other parameters, thereby ensuring the turbulence intensity in the combustion chamber, enhancing the mixing degree of fuel and air, and improving the combustion effect.

[0059] In some embodiments, the diameter of the combustion chamber gas guide surface 4 is larger than the diameter of the arc-shaped guide surface 3, that is, Figure 3 As shown, the gas guide circle where the combustion chamber gas guide surface 4 is located is larger than the gas guide circle where the arc-shaped guide surface 3 is located. Therefore, the combustion chamber gas guide surface 4 can have a larger tumble ratio and a stronger tumble effect.

[0060] Furthermore, in some embodiments, the width of the combustion chamber air guide surface 4 in the first direction is greater than the width of the arc-shaped guide surface 3 in the first direction, such as Figure 1 and Figure 2 As shown, the first direction is the up-down direction in the figure, that is, the width of the combustion chamber air guide surface 4 in the up-down direction is greater than the width of the arc-shaped guide surface 3 in the up-down direction. As a result, the stroke of the combustion chamber air guide surface 4 guiding the airflow can be greater than the stroke of the arc-shaped guide surface 3 guiding the airflow. In this way, the range of the combustion chamber air guide surface 4 guiding the mixed airflow is larger, and the tumble effect formed is also better.

[0061] In some embodiments, the surface roughness of the combustion chamber gas guide surface 4 is Ra, and satisfies: 0.8 μm ≤ Ra ≤ 1.6 μm. That is, Ra can be set between 0.8 μm and 1.6 μm, such as 0.8 μm, 0.82 μm, 0.85 μm, 0.87 μm, 0.88 μm, 0.91 μm, 0.93 μm, 0.94 μm, 0.95 μm, 0.96 μm, 0.98 μm, 1.01 μm, 1.02 μm, 1.03 μm, 1.04 μm, 1.05 μm, 1.06 μm, or can be set to other values ​​between 0.8μm and 1.6μm.

[0062] Among them, by setting this roughness, the air flow at the combustion chamber air guide surface 4 can be made more fluid, the exhaust and tumble effects can be increased, and at the same time, the intake can be made smoother, promoting the mixing of the newly entered gas and the mixture in the cylinder, and improving the mixing uniformity.

[0063] The utility model also provides an engine.

[0064] According to an embodiment of the present invention, an engine includes a cylinder block and a cylinder head 100 of any one of the above-mentioned embodiments, the cylinder head 100 is connected to the top of the cylinder block, and a cylinder hole 102 is formed in the cylinder block, wherein a piston is arranged in the cylinder hole 102, and the piston, cylinder block and cylinder head 100 jointly define a combustion chamber, the intake valve 1 and the exhaust valve 2 are both connected to the combustion chamber, and the arc-shaped guide surface 3 and the combustion chamber air guide surface 4 are both formed on the side of the cylinder head 100 facing the combustion chamber, thereby, in the process of the airflow in the combustion chamber flowing from the intake valve 1 toward the exhaust valve 2, a tumble effect can be generated through the arc-shaped guide surface 3 and the combustion chamber air guide surface 4, thereby enhancing the mixing uniformity of the airflow in the combustion chamber.

[0065] Among them, the distance between the center line of the cylinder hole 102 and the center of the combustion chamber air guide surface 4 is D, and satisfies: 0<D<A1 / A2. As a result, the center of the combustion chamber air guide surface 4 can be made closer to the center line of the cylinder hole 102, so that the airflow tumbling through the combustion chamber air guide surface 4 can flow to more positions in the cylinder hole 102, that is, the airflow can be diffused at a larger angle, forming a stronger tumbling effect, so that the airflow at the intake valve 1 can enter other positions in the combustion chamber more smoothly, thereby improving the intake efficiency.

[0066] In some embodiments, as Figure 3As shown, the diameter of the combustion chamber gas guide surface 4 is E1, and the diameter of the cylinder bore 102 is E2, and they satisfy: 0.2≤E1 / E2≤0.6, that is, the diameter of the combustion chamber gas guide surface 4 is smaller than the diameter of the cylinder bore 102, and the ratio of the two is set between 0.2 and 0.6, such as E1 / E2 is set to 0.2, 0.22, 0.25, 0.37, 0.38, 0.41, 0.43, 0.44, 0.52, 0.56, 0.59, 0.6, or other values ​​between 0.2 and 0.6. Therefore, by providing the corresponding combustion chamber gas guide surface 4 within this range on the cylinder head 100, the airflow can form a good tumble effect under the action of the combustion chamber gas guide surface 4 when passing through the combustion chamber gas guide surface 4, which helps the external intake air to enter the combustion chamber more smoothly from the intake valve 1, thereby improving the intake efficiency.

[0067] In a further embodiment, the diameter of the combustion chamber gas guide surface 4 is smaller than the diameter of the cylinder bore 102, and the ratio of the two is set between 0.3 and 0.5, such as setting E1 / E2 to 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, or other values ​​between 0.3 and 0.5. Thus, by providing the corresponding combustion chamber gas guide surface 4 within this range on the cylinder head 100, the airflow can form a good tumble effect under the action of the combustion chamber gas guide surface 4 when passing through the combustion chamber gas guide surface 4, which helps the external intake air to enter the combustion chamber more smoothly from the intake valve 1, thereby improving the intake efficiency.

[0068] The utility model also provides a vehicle.

[0069] According to the vehicle of the present invention, an engine according to any one of the above-mentioned embodiments is provided. By providing the engine, the airflow in the combustion chamber can be mixed more evenly, the fuel can be burned more completely, the fuel consumption can be reduced, the generation of CO can be reduced, and the working performance of the engine can be improved.

[0070] Throughout this specification, reference to terms such as "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 that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0071] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cylinder head, characterized in that: The cylinder head is provided with an intake valve and an exhaust valve spaced apart along a first direction, and the cylinder head is formed with an arc-shaped guide surface and a combustion chamber air guide surface sequentially distributed between the intake valve and the exhaust valve, and the center of the combustion chamber air guide surface and the center of the arc-shaped guide surface are both located below the cylinder head.

2. The cylinder head according to claim 1, characterized in that The distance between the center of the combustion chamber gas guide surface and the center of the arc guide surface in the vertical direction is A1, the distance between the center of the combustion chamber gas guide surface and the center of the arc guide surface in the first direction is A2, and satisfies: 2≤A1 / A2≤5.

3. The cylinder head according to claim 2, characterized in that Satisfies: 3≤A1 / A2≤4.

4. The cylinder head according to claim 1, characterized in that The cylinder head has a cylinder head bottom surface connected to the cylinder body, the distance from the center of the combustion chamber air guide surface to the cylinder head bottom surface is B1, the distance from the center of the arc guide surface to the cylinder head bottom surface is B2, and it satisfies: 0.1≤B1 / B2≤0.

3.

5. The cylinder head according to claim 4, characterized in that Satisfies: 0.15≤B1 / B2≤0.

25.

6. The cylinder head according to claim 1, characterized in that The edge of the combustion chamber air guide surface close to the intake valve is constructed as a first arc-shaped edge, and the edge of the combustion chamber air guide surface away from the intake valve is constructed as a second arc-shaped edge. The angle range corresponding to the first arc-shaped edge is smaller than the angle range corresponding to the second arc-shaped edge.

7. The cylinder head according to claim 6, characterized in that The angle range corresponding to the first arc-shaped side is C1, the angle range corresponding to the second arc-shaped side is C2, and the following relationship is satisfied: 0.3≤C1 / C2≤0.

7.

8. The cylinder head according to claim 7, characterized in that Satisfies: 0.4≤C1 / C2≤0.

6.

9. The cylinder head according to claim 1, characterized in that The diameter of the combustion chamber gas guide surface is larger than the diameter of the arc-shaped guide surface.

10. The cylinder head according to claim 1, wherein: The width of the combustion chamber air guide surface in the first direction is greater than the width of the arc-shaped guide surface in the first direction.

11. The cylinder head according to claim 1, wherein: The surface roughness of the combustion chamber gas guide surface is Ra, and satisfies the following: 0.8 μm≤Ra≤1.6 μm.

12. An engine, characterized in that: It comprises a cylinder body and a cylinder head according to any one of claims 1 to 7, wherein the cylinder head is connected to the top of the cylinder body, a cylinder hole is formed in the cylinder body, a distance D between the center line of the cylinder hole and the center of the gas guide surface of the combustion chamber is satisfied: 0<D<A1 / A2.

13. The engine according to claim 12, characterized in that The diameter of the combustion chamber gas guide surface is E1, the diameter of the cylinder hole is E2, and they satisfy: 0.2≤E1 / E2≤0.

6.

14. The engine according to claim 13, characterized in that Satisfies: 0.3≤E1 / E2≤0.

5.

15. A vehicle, characterized in that: An engine comprising the engine of any one of claims 12-14.

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