Combustion chamber structure and vehicle

Abstract

The invention relates to the technical field of vehicles, and particularly discloses a combustion chamber structure and a vehicle. The combustion chamber structure comprises a cylinder cover, an air inlet channel, an exhaust channel, a piston and a cylinder sleeve, and an outlet of the air inlet channel and an inlet of the exhaust channel are both formed in the inner wall of a dome of the cylinder cover; a first strip-shaped groove and a first flow guide structure are arranged on the inner wall of the air inlet channel, the first flow guide structure is located above the first strip-shaped groove, and the first strip-shaped groove extends in the length direction of the air inlet channel so that air inlet airflow can be conveniently guided to form tumble flow to a certain degree in the air inlet channel. An outlet of the air inlet channel faces the groove, after inlet air flow enters the combustion chamber, the inner wall of the dome is matched with the groove for guiding, tumble gas formed in the air inlet channel can form a more regular tumble group in the combustion chamber, the tumble ratio and turbulence energy are improved, the tumble effect is stable, the swirl ratio is reduced, the combustion speed in a cylinder is increased, and the heat efficiency of an engine is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a combustion chamber structure and a vehicle. Background Art

[0002] The combustion chamber structure of a natural gas engine includes a cylinder head, piston, cylinder liner, intake duct and exhaust duct. The cylinder liner is a fixed device, the piston is slidably installed inside the cylinder liner, the cylinder head is fixedly installed on the upper part of the cylinder liner, and the intake duct and exhaust duct are both fixedly installed on the upper part of the cylinder head. The cylinder head, piston and cylinder liner form a combustion chamber.

[0003] Conventional technology typically employs a design where the angle between the intake duct inlet and outlet is set between 45 and 55 degrees. Furthermore, the center of the cylinder head is designed as a dome, with the intake and exhaust ducts located on either side of the dome. The angle between the two sides of the cylinder head is set between 130 and 140 degrees. While this design can improve the tumble ratio to a certain extent, it requires a larger intake duct space to meet this angle, and the overall curvature of the intake duct must be modified. When space for the intake duct is limited, increasing the tumble ratio is difficult. Summary of the Invention

[0004] The object of the present invention is to provide a combustion chamber structure and a vehicle to solve the problem in the related art that the tumble ratio is difficult to increase when the space for arranging the intake duct is limited.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a combustion chamber structure, the combustion chamber structure comprising:

[0007] a cylinder head having a domed inner wall;

[0008] an intake passage and an exhaust passage, the intake passage and the exhaust passage being fixedly disposed on the cylinder head, with the outlet of the intake passage and the inlet of the exhaust passage both being opened on the inner wall of the dome; a first strip groove and a first flow-guiding structure being disposed on the inner wall of the intake passage, the first flow-guiding structure being located above the first strip groove, the first strip groove extending along the length of the intake passage, and the groove wall of the first strip groove in the length direction of the intake passage being a curved surface smoothly joined to the inner wall of the intake passage, the first flow-guiding structure being used to guide intake air of the intake passage to the position of the first strip groove;

[0009] A piston and a cylinder liner, the piston is inserted into the cylinder liner and is slidably connected to the cylinder liner, the cylinder head is fixedly arranged on the top of the cylinder liner, the top wall of the piston is provided with a groove, the cylinder head, the cylinder liner and the piston are arranged to form a combustion chamber, the inner wall of the dome is located above the groove, and when the piston rises to the top dead center, the outlet of the intake channel faces the groove position.

[0010] In one embodiment, an intake valve seat and an intake valve are provided at the outlet of the intake passage, the intake valve is used to open or close the intake passage, the intake valve is slidably provided on the intake valve seat, the intake valve includes an intake valve plate, the intake valve plate can abut against the intake valve seat, and the intake valve seat is provided at the end position of the first strip-shaped groove;

[0011] An exhaust valve seat and an exhaust valve are provided at the entrance of the exhaust passage. The exhaust valve is used to open or close the exhaust passage. The exhaust valve is slidably provided at the exhaust valve seat. The exhaust valve includes an exhaust valve plate, and the exhaust valve plate can abut against the exhaust valve seat.

[0012] In one embodiment, a second flow guide structure is provided on the cylinder head, and the second flow guide structure is located on the side of the intake valve seat close to the exhaust valve seat. The inner wall of the second flow guide structure is a smooth curved surface, and the inner wall of the second flow guide structure is connected to the inner wall of the intake valve seat and the inner wall of the second flow guide structure is connected to the inner wall of the dome. The second flow guide structure is used to guide the gas at the outlet of the intake channel to the exhaust valve seat side.

[0013] In one embodiment, a flow-blocking structure is provided on the cylinder head. The flow-blocking structure is located on a side of the intake valve seat away from the exhaust valve seat, and the flow-blocking structure is engaged with the intake valve seat.

[0014] In one embodiment, the cylinder head further includes an extension portion, the extension portion is located on a side of the exhaust valve seat away from the intake valve seat, and the inner wall of the extension portion is engaged with the inner wall of the dome, and the extension portion, the cylinder liner and the piston are surrounded to form an extension cavity.

[0015] In one embodiment, in the vertical direction of the line connecting the intake valve seat and the exhaust valve seat, the cylinder head is provided with two flow-blocking inner walls, the flow-blocking inner walls are engaged with the dome inner wall, and the distance between the two flow-blocking inner walls is smaller than the diameter of the dome inner wall.

[0016] In one embodiment, the groove is an ellipsoidal groove, the notch of the ellipsoidal groove is elliptical, and the intake valve seat and the exhaust valve seat are arranged along the short axis direction of the ellipse.

[0017] In one embodiment, the width of the first strip groove is 30 mm to 50 mm, and the maximum depth of the first strip groove is 4 mm to 7 mm.

[0018] In one embodiment, the first flow-guiding structure has an inclined section and a connecting curved surface, the inclined section and the connecting curved surface are recessed into the inner wall of the intake passage and are joined together, the bottom wall of the cylinder head is placed in the horizontal direction, and the angle between the inclined section and the horizontal direction is 15 to 25 degrees.

[0019] In a second aspect, the present invention provides a vehicle comprising an engine, wherein the combustion chamber structure of any of the above schemes is provided in the engine.

[0020] The beneficial effects of the present invention are:

[0021] The camshaft of the second combustion engine is actuated by the piston rod and the piston rod and is provided with a piston rod for expelling the combustion engine cylinder. The camshaft of the second combustion engine is actuated by the piston rod and the piston rod is provided with an air filter. The camshaft of the second combustion engine is actuated by the piston rod and the piston rod is provided with an air filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front view of the combustion chamber structure in an embodiment of the present invention;

[0023] Figure 2 This is an axonometric diagram of the combustion chamber structure in an embodiment of the present invention;

[0024] Figure 3 A longitudinal cross-sectional schematic diagram of a combustion chamber structure in an embodiment of the present invention;

[0025] Figure 4 Schematic diagram of another longitudinal section of the combustion chamber structure in an embodiment of the present invention.

[0026] In the picture:

[0027] 1. Cylinder head; 11. Dome inner wall; 12. Second flow guide structure; 13. Flow blocking structure; 14. Extension; 15. Flow blocking inner wall;

[0028] 2. Intake channel; 21. First strip groove; 22. First flow guide structure; 221. Inclined section; 222. Connecting curved surface; 23. Intake valve seat; 24. Intake valve;

[0029] 3. Exhaust channel; 31. Exhaust valve seat; 32. Exhaust valve;

[0030] 4. piston; 41. groove;

[0031] 5. Cylinder liner;

[0032] 6. Combustion chamber. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0034] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0037] like Figures 1 to 4 As shown, an embodiment of the first aspect of the present invention provides a combustion chamber structure, which includes a cylinder head 1, an intake channel 2, an exhaust channel 3, a piston 4 and a cylinder liner 5. The cylinder head 1 has a dome inner wall 11, an intake channel 2 and an exhaust channel 3. The intake channel 2 and the exhaust channel 3 are fixedly arranged on the cylinder head 1, and the outlet of the intake channel 2 and the inlet of the exhaust channel 3 are both opened on the dome inner wall 11. A first strip groove 21 and a first guide structure 22 are provided on the inner wall of the intake channel 2. The first guide structure 22 is located above the first strip groove 21. The first strip groove 21 is along the intake channel 2. The first strip groove 21 is provided in the longitudinal direction of the intake channel 2, and the groove wall of the first strip groove 21 in the longitudinal direction of the intake channel 2 is a curved surface smoothly connected to the inner wall of the intake channel 2. The first guide structure 22 is used to guide the intake of the intake channel 2 to the position of the first strip groove 21. The piston 4 is arranged in the cylinder liner 5 and is slidably connected to the cylinder liner 5. The cylinder head 1 is fixedly arranged at the top of the cylinder liner 5. The top wall of the piston 4 is provided with a groove 41. The cylinder head 1, the cylinder liner 5 and the piston 4 are surrounded by a combustion chamber 6. The inner wall 11 of the dome is located above the groove 41. When the piston 4 rises to the top dead center, the outlet of the intake channel 2 can face the position of the groove 41. The intake airflow of this embodiment changes its direction at the first guide structure 22 and guides the airflow downward to the position of the first strip groove 21. The groove wall of the first strip groove 21 in the length direction of the intake channel 2 is a curved surface smoothly connected to the inner wall of the intake channel 2, which is convenient for guiding the intake airflow to form a certain degree of tumble in the intake channel 2. After the intake airflow of the intake channel 2 enters the combustion chamber 6, the outlet of the intake channel 2 and the inlet of the exhaust channel 3 are both opened on the inner wall 11 of the dome. Under the coordinated guiding action of the inner wall 11 of the dome and the groove 41, the tumble gas formed in the intake channel 2 will form a more regular tumble group in the combustion chamber 6, thereby improving the tumble ratio and turbulent kinetic energy and stabilizing the tumble effect, reducing the swirl ratio, accelerating the combustion speed in the cylinder, and improving the thermal efficiency of the engine, thereby solving the problem in the related technology that the tumble ratio is difficult to improve when the intake duct layout space is limited.

[0038] In this embodiment, the intake passage 2 on the cylinder head 1 can have an intake inclination angle of 15 degrees. The intake inclination angle refers to the angle between the centerline of the intake passage and the centerline of the cylinder head 1. This intake inclination angle guides airflow into the combustion chamber 6 more smoothly, reduces intake resistance, and improves intake efficiency. The exhaust passage 3 can have an exhaust inclination angle of 11 degrees. The exhaust inclination angle refers to the angle between the centerline of the exhaust passage 3 and the centerline of the cylinder head 1. This exhaust inclination angle guides exhaust gas out of the combustion chamber 6 more smoothly, reduces exhaust resistance, and improves exhaust efficiency. The piston 4 compression ratio can be selected from 15 to 15.5, and the tumble ratio of the intake passage 2 can be selected from 2.6 to 3.3. The intake passage 2 can be entirely linear, with an angle between the intake passage 2 and the horizontal direction ranging from 30 to 40 degrees to ensure both high charging efficiency and tumble ratio. The first strip groove 21 can be a fish belly shaped structure or an ellipsoidal groove that is wide in the middle and narrow at both ends. Of course, it can also be an arc surface structure with the center line vertical along the length direction of the intake channel 2. It can cooperate with the first guide structure 22 to form a tumble flow in the intake air flow path.

[0039] like Figures 1 to 4 As shown, in some embodiments, an intake valve seat 23 and an intake valve 24 are provided at the outlet of the intake passage 2. The intake valve 24 is used to open or close the intake passage 2. The intake valve 24 is slidably disposed on the intake valve seat 23 and includes an intake valve plate that abuts against the intake valve seat 23 to form a good seal when closed. The intake valve seat 23 is disposed at the end of the first strip groove 21. When the intake valve 24 slides open, the tumble gas formed in the first strip groove 21 can directly enter the combustion chamber 6 through the air passage of the intake valve seat 23, reducing the path length of the tumble gas formed in the first strip groove 21 into the combustion chamber 6 and facilitating the gas to maintain a tumble state. An exhaust valve seat 31 and an exhaust valve 32 are provided at the entrance of the exhaust channel 3. The exhaust valve 32 is used to open or close the exhaust channel 3. The exhaust valve 32 can be slidably set on the exhaust valve seat 31. The exhaust valve 32 includes an exhaust valve plate, which can abut against the exhaust valve seat 31 to form a good seal when closed.

[0040] In some embodiments, a second flow guide structure 12 is provided on the cylinder head 1, and the second flow guide structure 12 is located on the side of the intake valve seat 23 close to the exhaust valve seat 31. The inner wall of the second flow guide structure 12 is a smooth curved surface. The inner wall of the second flow guide structure 12 is connected to the inner wall of the intake valve seat 23 and the inner wall of the second flow guide structure 12 is connected to the inner wall of the dome 11. The second flow guide structure 12 is used to guide the gas at the outlet of the intake channel 2 to the side of the exhaust valve seat 31, so that the intake air flow can enter the combustion chamber 6 more from the side close to the exhaust valve seat 31 when entering the combustion chamber 6, which is beneficial to improve the tumble ratio in the combustion chamber 6.

[0041] In this embodiment, the second flow-guiding structure 12 can be a curved surface processed using an eccentric dimpling method, and the boundary angle of the second flow-guiding structure 12 distributed circumferentially on the intake valve seat 23 can be 120 degrees to 140 degrees. Optionally, the second flow-guiding structure 12 can be a partial sphere, with the center of the sphere deviating from the center line of the intake passage 2 toward the exhaust valve seat 31, or the second flow-guiding structure 12 can also be a beveled surface.

[0042] like Figures 1 to 4 As shown, in some embodiments, a baffle structure 13 is provided on the cylinder head 1. The baffle structure 13 is located on the side of the intake valve seat 23 away from the exhaust valve seat 31, and the baffle structure 13 is engaged with the intake valve seat 23 to prevent the intake air flow from flowing to the side of the intake valve seat 23 away from the exhaust valve seat 31. In this way, the intake air flow can enter the combustion chamber 6 more from the side close to the exhaust valve seat 31 when entering the combustion chamber 6, which is beneficial to improving the tumble ratio in the combustion chamber 6.

[0043] In this embodiment, the flow-blocking structure 13 may be a vertical section or a curved surface provided on the inner side of the cylinder head 1 , and may be capable of performing lateral flow blocking on the intake airflow flowing out of the intake valve seat 23 .

[0044] In some embodiments, the cylinder head 1 also includes an extension portion 14, which is located on the side of the exhaust valve seat 31 away from the intake valve seat 23, and the inner wall of the extension portion 14 is engaged with the inner wall 11 of the dome. The extension portion 14 and the cylinder liner 5 and the piston 4 are surrounded to form an extension cavity, so that the flame surface in the combustion chamber 6 develops preferentially toward the exhaust valve seat 31 side after it is formed. This embodiment helps to delay the time when the flame touches the wall and speed up the combustion speed by expanding the space here.

[0045] In this embodiment, the inner wall of the extension portion 14 is a curved surface or an inclined section with a different curvature from the dome inner wall 11. When the extension portion 14 adopts an inclined section 221, a triangular extension cavity can be formed, which facilitates further delaying the flame from touching the wall.

[0046] In some embodiments, the cylinder head 1 is provided with two baffle inner walls 15 in the vertical direction of the line connecting the intake valve seat 23 and the exhaust valve seat 31. The two baffle inner walls 15 are respectively provided on both sides of the line connecting the intake valve seat 23 and the exhaust valve seat 31. The baffle inner walls 15 are connected to the dome inner wall 11, and the distance between the two baffle inner walls 15 is less than the diameter of the dome inner wall 11. The flame surface of the tumble combustion chamber 6 develops fastest toward the exhaust valve seat 31 side, followed by the intake valve seat 23 side, and develops slowest in the vertical direction of the line connecting the intake valve seat 23 and the exhaust valve seat 31. By providing two baffle inner walls 15 in this embodiment, it is not only convenient to guide the airflow from the intake valve seat 23 to the exhaust valve seat 31, but also possible to reduce the volume of the dome inner wall 11 of the cylinder head 1 in the vertical direction of the line connecting the intake valve seat 23 and the exhaust valve seat 31, so that the structure of the combustion chamber 6 is more compact, heat transfer loss is reduced, and knock tendency is reduced.

[0047] In this embodiment, the baffle inner wall 15 can be a vertical cutting surface, and the difference between the vertical distance between the baffle inner wall 15 and the contour center of the dome inner wall 11 and the contour radius of the dome inner wall 11 in the cross section is 5 mm to 8 mm, so as to fill the reduced volume inside the cylinder head 1.

[0048] In some embodiments, the groove 41 is an ellipsoidal groove, the notch of the ellipsoidal groove is elliptical, the intake valve seat 23 and the exhaust valve seat 31 are arranged along the short axis direction of the ellipse, and the tumbling airflow in the combustion chamber 6 can be guided by the arc surface of the short axis of the combustion chamber 6 during the intake and compression strokes, which is beneficial to maintaining the movement of the airflow. Moreover, by setting the groove 41 as an ellipsoidal groove, it is beneficial to keep the flow velocity near the spark plug at the ignition moment slow and the turbulent kinetic energy intensity high.

[0049] In this embodiment, the elliptical dimensions of the ellipsoidal groove opening profile are: the short axis length is 90 mm to 100 mm, the long axis length is 110 mm to 130 mm, and the maximum groove depth of the ellipsoidal groove is 10 mm to 15 mm, which facilitates more effective maintenance of airflow and turbulent kinetic energy intensity in a conventional-sized combustion chamber 6.

[0050] In some embodiments, the width of the first strip groove 21 is 30 mm to 50 mm, and the maximum depth of the first strip groove 21 is 4 mm to 7 mm, which is convenient for forming a moderate guide cross-section, enhancing the rotational movement of the airflow, thereby improving the tumble ratio, and effectively guiding the airflow in the intake duct, so that it forms a more stable tumble when entering the combustion chamber 6.

[0051] like Figures 1 to 4As shown, in some embodiments, the first guide structure 22 has an inclined section 221 and a connecting curved surface 222, the inclined section 221 and the connecting curved surface 222 are recessed into the inner wall of the intake passage 2 and are connected, the bottom wall of the cylinder head 1 is placed in the horizontal direction, the angle between the inclined section 221 and the horizontal direction is 15 to 25 degrees, the inclined section 221 and the connecting curved surface 222 can form a concave guide structure, and the angle between the inclined section 221 and the horizontal direction is 15 to 25 degrees, which facilitates the rapid change of flow direction of the intake airflow, and the connecting curved surface 222 facilitates smooth guidance toward the intake passage 2, thereby reducing airflow resistance.

[0052] An embodiment of the second aspect of the present invention provides a vehicle, comprising an engine, wherein the combustion chamber structure according to any of the above embodiments is provided in the engine.

[0053] Since the vehicle includes the above-mentioned combustion chamber structure, the vehicle of the embodiment of the present invention has all the advantages and beneficial effects of the above-mentioned embodiment, which will not be described in detail here.

[0054] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A combustion chamber structure, characterized in that: The combustion chamber structure comprises: A cylinder head (1), the cylinder head (1) having a dome inner wall (11); An intake channel (2) and an exhaust channel (3), wherein the intake channel (2) and the exhaust channel (3) are fixedly arranged on the cylinder head (1), and the outlet of the intake channel (2) and the inlet of the exhaust channel (3) are both opened on the inner wall (11) of the dome, and a first strip groove (21) and a first guide structure (22) are provided on the inner wall of the intake channel (2), wherein the first guide structure (22) is located above the first strip groove (21), and the first strip groove (21) extends along the length direction of the intake channel (2), and the groove wall of the first strip groove (21) in the length direction of the intake channel (2) is a curved surface smoothly connected with the inner wall of the intake channel (2), and the first guide structure (22) is used for guiding the intake of the intake channel (2) to the position of the first strip groove (21); A piston (4) and a cylinder liner (5), wherein the piston (4) is inserted into the cylinder liner (5) and is slidably connected to the cylinder liner (5), the cylinder head (1) is fixedly arranged on the top of the cylinder liner (5), the top wall of the piston (4) is provided with a groove (41), the cylinder head (1), the cylinder liner (5) and the piston (4) are arranged to form a combustion chamber (6), the dome inner wall (11) is located above the groove (41), and when the piston (4) rises to the top dead center, the outlet of the intake passage (2) faces the groove (41).

2. The combustion chamber structure according to claim 1, characterized in that: An intake valve seat (23) and an intake valve (24) are provided at the outlet of the intake channel (2), the intake valve (24) being used to open or close the intake channel (2), the intake valve (24) being slidably provided at the intake valve seat (23), the intake valve (24) comprising an intake valve plate, the intake valve plate being capable of abutting against the intake valve seat (23), and the intake valve seat (23) being provided at an end position of the first strip-shaped groove (21); An exhaust valve seat (31) and an exhaust valve (32) are provided at the inlet of the exhaust passage (3). The exhaust valve (32) is used to open or close the exhaust passage (3). The exhaust valve (32) is slidably provided at the exhaust valve seat (31). The exhaust valve (32) includes an exhaust valve plate, and the exhaust valve plate can abut against the exhaust valve seat (31).

3. The combustion chamber structure according to claim 2, characterized in that: A second flow-guiding structure (12) is provided on the cylinder head (1), and the second flow-guiding structure (12) is located on a side of the intake valve seat (23) close to the exhaust valve seat (31). The inner wall of the second flow-guiding structure (12) is a smooth curved surface. The inner wall of the second flow-guiding structure (12) is connected to the inner wall of the intake valve seat (23) and the inner wall of the second flow-guiding structure (12) is connected to the inner wall of the dome (11). The second flow-guiding structure (12) is used to guide the gas at the outlet of the intake channel (2) to the exhaust valve seat (31) side.

4. The combustion chamber structure according to claim 3, characterized in that: The cylinder head (1) is provided with a flow-blocking structure (13), the flow-blocking structure (13) is located on a side of the intake valve seat (23) away from the exhaust valve seat (31), and the flow-blocking structure (13) is engaged with the intake valve seat (23).

5. The combustion chamber structure according to claim 3, characterized in that: The cylinder head (1) further comprises an extension portion (14), the extension portion (14) being located on a side of the exhaust valve seat (31) away from the intake valve seat (23), and the inner wall of the extension portion (14) being engaged with the inner wall of the dome (11), and the extension portion (14) and the cylinder liner (5) and the piston (4) forming an extension cavity.

6. The combustion chamber structure according to claim 2, characterized in that: In the vertical direction of the line connecting the intake valve seat (23) and the exhaust valve seat (31), the cylinder head (1) is provided with two flow-blocking inner walls (15), the flow-blocking inner walls (15) are engaged with the dome inner wall (11), and the distance between the two flow-blocking inner walls (15) is smaller than the diameter of the dome inner wall (11).

7. The combustion chamber structure according to claim 2, characterized in that: The groove (41) is an ellipsoidal groove, the notch of the ellipsoidal groove is elliptical, and the intake valve seat (23) and the exhaust valve seat (31) are arranged along the short axis direction of the ellipse.

8. The combustion chamber structure according to any one of claims 1 to 7, characterized in that: The width of the first strip groove (21) is 30 mm to 50 mm, and the maximum depth of the first strip groove (21) is 4 mm to 7 mm.

9. The combustion chamber structure according to any one of claims 1 to 7, characterized in that: The first flow-guiding structure (22) has an inclined section (221) and a connecting curved surface (222); the inclined section (221) and the connecting curved surface (222) are recessed into the inner wall of the intake passage (2) and are joined to each other; the bottom wall of the cylinder head (1) is placed in a horizontal direction; and the angle between the inclined section (221) and the horizontal direction is 15 to 25 degrees.

10. A vehicle, characterized in that: The invention comprises an engine, wherein the combustion chamber structure according to any one of claims 1 to 9 is provided in the engine.

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