Piston, engine and vehicle

Abstract

The utility model discloses a piston, an engine and a vehicle. The piston comprises a main body part, the wave trough is arranged in the middle of one end of the main body part, and the wave trough is sunken towards the direction of the main body part; the humps are arranged at one end of the main body part, the humps are located on the two opposite sides of the trough respectively, and the humps are arranged in a protruding mode in the direction away from the main body part. The trough is arranged in the middle of one end of the main body part, and the trough and the combustion chamber ridge of the cylinder cover form a structure with a middle cavity with large volume and gradually reduced volume towards cavities on two sides, so that flame can be propagated in three-dimensional multiple directions, and the combustion flame propagation efficiency and the heat efficiency of an engine are favorably improved; the humps are arranged in the direction away from the main body part in a protruding mode, so that the humps occupy a certain space of the inner cavity of the combustion chamber, the compression ratio of gas can be increased, and the design requirement for the ultrahigh compression ratio of an engine can be met to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a piston, an engine and a vehicle. Background Art

[0002] In the related technology, a middle protrusion is provided in the piston. However, the obstruction of the middle protrusion affects the flow in the cylinder, the turbulent kinetic energy is affected, and the oil and gas cannot be fully mixed. Moreover, the existing technology only considers the flame propagation jet, but does not consider the three-dimensional direction propagation of the flame, which affects the combustion efficiency of the engine. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a piston whose flame can achieve three-dimensional multi-directional propagation, improve the engine combustion flame propagation efficiency and engine thermal efficiency, and can meet the design requirements of the ultra-high compression ratio of the engine to the maximum extent.

[0004] The utility model further provides an engine.

[0005] The utility model further provides a vehicle.

[0006] According to the utility model, the piston includes: a main body; a trough, which is arranged in the middle of one end of the main body and is recessed toward the main body; a hump, which is arranged at one end of the main body and is respectively located on two opposite sides of the trough and is protruding away from the main body.

[0007] According to the piston of the utility model, by setting the trough in the middle of one end of the main body, the trough and the combustion chamber ridge of the cylinder head form a structure with a large middle cavity volume and a gradually decreasing cavity volume on both sides. The flame can be propagated in three dimensions and in multiple directions, and is beneficial to improving the engine combustion flame propagation efficiency and the engine thermal efficiency. Moreover, the hump is protruding away from the main body, so that the hump will occupy a certain space in the combustion chamber cavity, which can improve the compression ratio of the gas. Therefore, the design requirements of the engine's ultra-high compression ratio can be met to the maximum extent.

[0008] In some examples of the present invention, the piston further includes: a first rounded transition portion, wherein the first rounded transition portion is connected between the trough and the hump.

[0009] In some examples of the utility model, the piston also includes: a first slope and a second slope, the first slope and the second slope are both arranged at one end of the main body, there are two humps, and the two sides of the connecting line connecting the centers of the two humps are the intake side and the exhaust side, respectively, the first slope is located on the intake side, and the second slope is located on the exhaust side.

[0010] In some examples of the present invention, in the direction from the intake side toward the exhaust side, the trough is located between the first slope and the second slope, and in the direction away from the trough, the first slope is inclined toward the main body, and the second slope is inclined toward the main body.

[0011] In some examples of the present invention, the piston also includes: a second rounded transition portion and a third rounded transition portion, the second rounded transition portion is connected between the first slope and the trough, and between the first slope and the hump, and the third rounded transition portion is connected between the second slope and the trough, and between the second slope and the hump.

[0012] In some examples of the present invention, the piston also includes: a first air squeezing portion and a second air squeezing portion, wherein the first air squeezing portion and the second air squeezing portion are both arranged at one end of the main body, and the first air squeezing portion is located on a side of the first slope away from the second slope, and the second air squeezing portion is located on a side of the second slope away from the first slope.

[0013] In some examples of the present invention, the main body is constructed in a ring shape, and in the axial direction of the main body, the first air squeezing portion and the second air squeezing portion are located at the same height, and the distance between the hump and the first air squeezing portion is a, and the value range of a is: 4mm≤a≤10mm.

[0014] In some examples of the present invention, the piston also includes: a fourth rounded transition portion and a fifth rounded transition portion, the fourth rounded transition portion is connected between the first squeezing portion and the first slope, and the fifth rounded transition portion is connected between the second squeezing portion and the second slope.

[0015] In some examples of the present invention, the piston further includes: a basin, the basin is arranged at one end of the main body, and the trough is located on the outer peripheral side of the basin.

[0016] In some examples of the present invention, the piston further includes: a sixth rounded transition portion, wherein the sixth rounded transition portion is connected between the basin and the trough.

[0017] The engine according to the utility model comprises: a cylinder head, wherein the cylinder head comprises: a combustion chamber ridge; and the piston described above, wherein the combustion chamber ridge and the trough define a cavity.

[0018] In some examples of the present invention, the piston includes: a first extrusion portion and a second extrusion portion, and the cylinder head also includes: a third extrusion portion and a fourth extrusion portion. When the piston is matched with the cylinder head, a gap is formed between the first extrusion portion and the third extrusion portion, and a gap is formed between the second extrusion portion and the fourth extrusion portion.

[0019] In some examples of the present invention, the minimum distance between the hump and the combustion chamber ridge is a, the gap between the second air squeezing portion and the fourth air squeezing portion is b, and the relationship between a and b is: a>b.

[0020] The vehicle according to the utility model comprises: the engine mentioned above.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 It is a structural schematic diagram of a piston according to an embodiment of the utility model;

[0024] Figure 2 is a cross-sectional view of an engine at a first angle according to another embodiment of the utility model;

[0025] Figure 3 It is a cross-sectional view at a second angle of an engine according to another embodiment of the utility model.

[0026] Reference numerals:

[0027] 1. Piston;

[0028] 10. Main body; 20. Trough; 30. Hump; 40. First rounded transition portion; 50. First slope; 60. Second slope; 70. Second rounded transition portion; 80. Third rounded transition portion; 90. First squeeze portion; 100. Second squeeze portion; 110. Fourth rounded transition portion; 120. Fifth rounded transition portion; 130. Basin; 140. Sixth rounded transition portion; 2. Engine; 3. Cylinder head; 150. Combustion chamber roof; 160. Third squeeze portion; 170. Fourth squeeze portion; 180. Intake valve disc; 190. Exhaust valve disc; 200. Spark plug; 210. Cavity. DETAILED DESCRIPTION

[0029] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0030] Reference below Figure 1-Figure 3 A piston 1 according to an embodiment of the present invention is described. The piston 1 and a cylinder head 3 together constitute an engine 2 .

[0031] like Figure 1 As shown, the piston 1 according to the embodiment of the utility model comprises: a main body 10, a trough 20 and a hump 30. The main body 10 is the main body 10 of the piston 1, the trough 20 refers to the concave part of the piston 1, and the hump 30 refers to the convex part of the piston 1.

[0032] like Figure 1 As shown, the trough 20 is arranged at the middle of one end of the main body 10, and the trough 20 is arranged concavely in the direction of the main body 10, and the hump 30 is arranged at one end of the main body 10, and the hump 30 is respectively located on the opposite sides of the trough 20. It should be noted that there are two humps 30, the heights of the two humps 30 are the same, and the two humps 30 are symmetrically distributed with the trough 20, and the humps 30 are arranged protruding away from the main body 10. In this way, the piston 1 forms a saddle-shaped structure as a whole.

[0033] Specifically, firstly, the trough 20 and the hump 30 are both located at the same end of the main body 10, that is, the end facing the cylinder head 3 of the engine 2. When the piston 1 and the cylinder head 3 constitute the engine 2, it should be noted that the piston 1 can move relative to the cylinder head 3, and a combustion chamber will be formed between the piston 1 and the cylinder head 3, and the fuel or propellant can burn in the combustion chamber to generate high-temperature combustion gas.

[0034] Since the trough 20 is recessed in the direction of the main body 10, the trough 20 will be combined with the combustion chamber ridge 150 of the cylinder head 3 to form a larger cavity 210 structure, and the trough 20 is arranged in the middle of one end of the main body 10, so that the volume of the middle part of the cavity 210 structure formed by the combustion chamber ridge 150 of the cylinder head 3 is the largest, and the volume of the cavity 210 structure on both sides will gradually decrease. When the spark plug 200 is ignited, the flame can be propagated in three dimensions and in multiple directions, and as the volume of the cavity 210 structure gradually decreases from the middle to both sides, it is beneficial to improve the combustion flame propagation efficiency of the engine 2 and the thermal efficiency of the engine 2.

[0035] In addition, since the hump 30 is arranged to protrude away from the main body 10, after the engine 2 is formed, the hump 30 will extend into the cylinder head 3, so that the hump 30 will occupy a certain space in the combustion chamber cavity 210. It can be understood that when the amount of compressed gas is constant, the volume of the combustion chamber cavity 210 is reduced, which can improve the compression ratio of the gas, thereby maximally meeting the design requirements of the ultra-high compression ratio of the engine 2.

[0036] Therefore, by setting the trough 20 in the middle of one end of the main body 10, the trough 20 and the combustion chamber ridge 150 of the cylinder head 3 form a structure in which the middle cavity 210 has a large volume and the volume of the cavity 210 on both sides gradually decreases. The flame can be propagated in three dimensions and in multiple directions, which is beneficial to improving the combustion flame propagation efficiency and thermal efficiency of the engine 2. The hump 30 is protruding away from the main body 10, so that the hump 30 will occupy a certain space in the combustion chamber cavity 210, which can improve the compression ratio of the gas. Therefore, the design requirements of the ultra-high compression ratio of the engine 2 can be met to the maximum extent.

[0037] In addition, if Figure 1 As shown, the piston 1 further includes: a first fillet transition portion 40, which is connected between the trough 20 and the hump 30. That is, a smooth transition needs to be made between the trough 20 and the hump 30 through an inclined surface and a fillet, and the fillet radius is not less than 6 mm. Too small a fillet is prone to produce a sharp corner, which can further avoid the generation of hot spots during the operation of the engine 2 to cause pre-ignition.

[0038] It should be noted that if Figure 1 and Figure 2 As shown, the piston 1 further includes: a first slope 50 and a second slope 60, both of which are arranged at one end of the main body 10, and there are two humps 30, and the two sides of the connecting line connecting the centers of the two humps 30 are respectively on the intake side and the exhaust side, and the first slope 50 is located on the intake side, and the second slope 60 is located on the exhaust side. In other words, the periphery of the trough 20 forms a quadrilateral structure, the two humps 30 are located on the opposite sides of the trough 20, and the first slope 50 and the second slope 60 are located on the other opposite sides, that is, respectively on the intake side and the exhaust side, and the first slope 50 and the second slope 60 can form a flow channel with the combustion chamber ridge 150, respectively, and the flow channel is not shielded by the humps 30, so that the gas in the cylinder of the engine 2 can flow more smoothly on the intake and exhaust sides, thereby improving the flow efficiency in the cylinder of the engine 2. Among them, the first slope 50 is parallel to the intake valve disc 180 of the cylinder head 3, and the second slope 60 is parallel to the exhaust valve disc 190.

[0039] Among them, Figure 1 and Figure 2As shown, in the direction from the intake side toward the exhaust side, the trough 20 is located between the first slope 50 and the second slope 60, and in the direction away from the trough 20, the first slope 50 is inclined toward the main body 10, and the second slope 60 is inclined toward the main body 10. That is to say, in the direction from the trough 20 to the first slope 50 and the second slope 60, the first slope 50 and the second slope 60 are respectively arranged away from the cylinder head, so that the height difference with the hump 30 can be increased, and the influence of the hump 30 on the airflow on the first slope 50 and the second slope 60 can be reduced as much as possible, so that the gas in the cylinder of the engine 2 flows more smoothly on the intake and exhaust sides, and the in-cylinder flow efficiency of the engine 2 is improved.

[0040] Of course, if Figure 1 As shown, the piston 1 further includes: a second fillet transition portion 70 and a third fillet transition portion 80, the second fillet transition portion 70 is connected between the first slope 50 and the trough 20, and between the first slope 50 and the hump 30, and the third fillet transition portion 80 is connected between the second slope 60 and the trough 20, and between the second slope 60 and the hump 30. That is, between the first slope 50 and the trough 20, and between the first slope 50 and the hump 30, a fillet is required for smooth transition, and the fillet radius is not less than 6mm, and a too small fillet is prone to produce a sharp corner, which can further avoid the generation of hot spots and premature ignition during the operation of the engine 2. Similarly, between the second slope 60 and the trough 20, and between the second slope 60 and the hump 30, a fillet is also required for smooth transition, and the fillet radius is not less than 3mm, and a too small fillet is prone to produce a sharp corner, which can further avoid the generation of hot spots and premature ignition during the operation of the engine 2.

[0041] Furthermore, if Figure 1 and Figure 2As shown, the piston 1 further includes: a first squeezing portion 90 and a second squeezing portion 100, both of which are arranged at one end of the main body 10, and the first squeezing portion 90 is located on the side of the first slope 50 away from the second slope 60, and the second squeezing portion 100 is located on the side of the second slope 60 away from the first slope 50. It should be noted that the cylinder head 3 further includes: a third squeezing portion 160 and a fourth squeezing portion 170, and when the piston 1 is matched with the cylinder head 3, a gap is formed between the first squeezing portion 90 and the third squeezing portion 160, and a gap is formed between the second squeezing portion 100 and the fourth squeezing portion 170. The piston 1 and the cylinder head 3 cooperate with each other, that is, when the piston 1 moves to the top dead center, the combustion chamber is the smallest, a gap is formed between the first squeezing portion 90 and the third squeezing portion 160, and a gap is formed between the second squeezing portion 100 and the fourth squeezing portion 170. In this way, the gas can pass through the gap between the first squeezing portion 90 and the third squeezing portion 160 and squeeze into the channel formed by the trough 20 and the combustion chamber ridge 150, thereby improving the air flow in the combustion chamber, improving the oil-gas mixing efficiency of the engine 2, being more conducive to the combustion of the engine 2, and improving the thermal efficiency of the engine 2. The burned gas can be discharged through the gap between the second squeezing portion 100 and the fourth squeezing portion 170.

[0042] It should be noted that the main body 10 is constructed in a ring shape. In the axial direction of the main body 10, the first squeezing part 90 and the second squeezing part 100 are located at the same height. The distance between the hump 30 and the first squeezing part 90 is a, and the value range of a is: 4mm≤a≤10mm. The first squeezing part 90 and the second squeezing part 100 are located at the same height, which is convenient for processing and setting the first squeezing part 90 and the second squeezing part 100, and the height difference between the hump 30 and the first squeezing part 90 needs to be within a reasonable range. The height difference between the hump 30 and the first squeezing part 90 cannot be too small, that is, less than 4mm, so that the protruding size of the hump 30 is too small, and the effect of improving the compression ratio of the engine 2 is not obvious. Of course, the height difference between the hump 30 and the first squeezing part 90 cannot be too large, that is, greater than 10mm, which is not convenient for the production and setting of the hump 30, and under the premise of meeting the ultra-high compression ratio of the engine 2, this will increase the production material of the hump 30 and increase the cost.

[0043] In addition, if Figure 1As shown, the piston 1 further includes: a fourth rounded corner transition portion 110 and a fifth rounded corner transition portion 120, wherein the fourth rounded corner transition portion 110 is connected between the first squeezing portion 90 and the first slope 50, and the fifth rounded corner transition portion 120 is connected between the second squeezing portion 100 and the second slope 60. That is, a rounded corner is required for smooth transition between the first squeezing portion 90 and the first slope 50, and the rounded corner radius is greater than 1 mm, so as to ensure a smooth transition of the connection and avoid the generation of sharp corners, and further avoid the generation of hot spots and premature ignition during the operation of the engine 2. Similarly, a rounded corner is also required for smooth transition between the second squeezing portion 100 and the second slope 60, and the rounded corner radius is greater than 1 mm, so as to ensure a smooth transition of the connection and avoid the generation of sharp corners, and further avoid the generation of hot spots and premature ignition during the operation of the engine 2.

[0044] Secondly, if Figure 1 As shown, the piston 1 further includes: a basin 130, the basin 130 is arranged at one end of the main body 10, and the trough 20 is located at the outer peripheral side of the basin 130. The basin 130 is arranged at the center of the trough 20, and the basin 130 can be arranged by machining, so that the arrangement of the basin 130 can be more accurate, so that the volume of the piston 1 can be more accurately controlled. Of course, this can also make the basin 130 further avoid the spark plug 200, and at the same time, the structure of the space near the spark plug 200 can be further increased, and the propagation efficiency of the combustion flame of the engine 2 can be further improved.

[0045] In addition, Figure 1 As shown, the piston 1 further includes: a sixth fillet transition portion 140, which is connected between the basin 130 and the trough 20. That is, a fillet is required for smooth transition between the basin 130 and the trough 20, and the basin 130 and the trough 20 are connected in an inner fillet manner, and the intersection of the fillet and the trough 20 is an obtuse angle, which can avoid machining burrs, and further avoid hot spots during the operation of the engine 2 that lead to pre-ignition.

[0046] like Figure 2 and Figure 3As shown, the engine 2 according to the embodiment of the utility model comprises: a cylinder head 3 and the piston 1 described in the above embodiment, the cylinder head 3 comprises: a combustion chamber ridge 150, and the combustion chamber ridge 150 and the trough 20 define a cavity 210. The trough 20 is arranged in the middle of one end of the main body 10, and the trough 20 and the combustion chamber ridge 150 of the cylinder head 3 form a structure in which the volume of the middle cavity 210 is large and the volume of the cavity 210 on both sides gradually decreases, so that the flame can be propagated in three dimensions and in multiple directions, and is conducive to improving the combustion flame propagation efficiency of the engine 2 and the thermal efficiency of the engine 2, and the hump 30 is arranged to protrude in the direction away from the main body 10, so that the hump 30 will occupy a certain space of the combustion chamber cavity 210, so that the compression ratio of the gas can be improved, and therefore, the design requirements of the ultra-high compression ratio of the engine 2 can be met to the maximum extent.

[0047] Among them, the minimum distance between the hump 30 and the combustion chamber ridge 150 is a, the gap between the second squeezing part 100 and the fourth squeezing part 170 is b, and the relationship between a and b is: a>b. For example: the matching gap between the second squeezing part 100 and the fourth squeezing part 170 is about 1mm, and the gap between the hump 30 and the combustion chamber ridge 150 is at least greater than 1mm. It should be noted that when the air in the combustion chamber needs to be discharged, it first passes through the positions on both sides of the hump 30 and the combustion chamber ridge 150, where the distance between the hump 30 and the combustion chamber ridge 150 is the smallest, and then passes through the gap between the second squeezing part 100 and the fourth squeezing part 170. The gas is released from a large space to a small space, which can further improve the flame propagation efficiency.

[0048] The vehicle according to the embodiment of the utility model comprises: the engine 2 described in the above embodiment.

[0049] 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 a limitation on the present invention.

[0050] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In the description of the present utility model, "plurality" means two or more. In the description of the present utility model, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0051] 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 utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0052] 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 spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A piston (1), characterized in that: include: A main body (10); A trough (20), the trough (20) being arranged in the middle of one end of the main body (10), and the trough (20) being arranged concavely in the direction of the main body (10); A hump (30), wherein the hump (30) is arranged at one end of the main body (10), and the hump (30) is respectively located on two opposite sides of the trough (20), and the hump (30) is protruding in a direction away from the main body (10).

2. The piston (1) according to claim 1, characterized in that Also includes: A first rounded corner transition portion (40), wherein the first rounded corner transition portion (40) is connected between the wave valley (20) and the hump (30).

3. The piston (1) according to claim 1, characterized in that Also includes: A first slope (50) and a second slope (60), wherein the first slope (50) and the second slope (60) are both arranged at one end of the main body (10), there are two humps (30), and the two sides of a connecting line connecting the centers of the two humps (30) are respectively an intake side and an exhaust side, the first slope (50) is located on the intake side, and the second slope (60) is located on the exhaust side.

4. The piston (1) according to claim 3, characterized in that In the direction from the air intake side toward the exhaust side, the trough (20) is located between the first slope (50) and the second slope (60); in the direction away from the trough (20), the first slope (50) is inclined toward the main body (10), and the second slope (60) is inclined toward the main body (10).

5. The piston (1) according to claim 3, characterized in that Also includes: A second rounded transition portion (70) and a third rounded transition portion (80), wherein the second rounded transition portion (70) is connected between the first slope (50) and the trough (20), and between the first slope (50) and the hump (30), and the third rounded transition portion (80) is connected between the second slope (60) and the trough (20), and between the second slope (60) and the hump (30).

6. The piston (1) according to claim 3, characterized in that Also includes: A first air squeezing portion (90) and a second air squeezing portion (100), wherein the first air squeezing portion (90) and the second air squeezing portion (100) are both arranged at one end of the main body (10), and the first air squeezing portion (90) is located on a side of the first slope (50) away from the second slope (60), and the second air squeezing portion (100) is located on a side of the second slope (60) away from the first slope (50).

7. The piston (1) according to claim 6, characterized in that The main body (10) is constructed in a ring shape. In the axial direction of the main body (10), the first air squeezing portion (90) and the second air squeezing portion (100) are located at the same height. The distance between the hump (30) and the first air squeezing portion (90) is a, and the value range of a is: 4mm≤a≤10mm.

8. The piston (1) according to claim 6, characterized in that Also includes: A fourth rounded transition portion (110) and a fifth rounded transition portion (120), wherein the fourth rounded transition portion (110) is connected between the first air squeezing portion (90) and the first slope (50), and the fifth rounded transition portion (120) is connected between the second air squeezing portion (100) and the second slope (60).

9. The piston (1) according to claim 1, characterized in that Also includes: A basin (130) is provided at one end of the main body (10), and the trough (20) is located on the outer peripheral side of the basin (130).

10. The piston (1) according to claim 9, characterized in that Also includes: A sixth rounded transition portion (140), the sixth rounded transition portion (140) is connected between the basin (130) and the trough (20).

11. An engine (2), characterized in that: include: A cylinder head (3), the cylinder head (3) comprising: a combustion chamber ridge (150); In the piston (1) according to any one of claims 1 to 10, the combustion chamber ridge (150) and the trough (20) define a cavity (210).

12. The engine (2) according to claim 11, characterized in that The piston (1) comprises a first gas squeezing portion (90) and a second gas squeezing portion (100); the cylinder head (3) further comprises a third gas squeezing portion (160) and a fourth gas squeezing portion (170); when the piston (1) and the cylinder head (3) are matched, a gap is formed between the first gas squeezing portion (90) and the third gas squeezing portion (160), and a gap is formed between the second gas squeezing portion (100) and the fourth gas squeezing portion (170).

13. The engine (2) according to claim 12, characterized in that The minimum distance between the hump (30) and the combustion chamber ridge (150) is a, the gap between the second air squeezing portion (100) and the fourth air squeezing portion (170) is b, and the relationship between a and b is: a>b.

14. A vehicle, characterized in that: include: The engine (2) as claimed in any one of claims 11 to 13.

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