Engine air intake structure and automobile

Abstract

The present invention discloses an engine intake structure, comprising a cylinder head, an intake valve seat mounted on the cylinder head, an intake duct connected to the intake valve seat, and an intake valve that cooperates with the intake valve seat to seal the intake duct and combustion chamber. The intake duct guides airflow through the intake valve seat into the combustion chamber. The cylinder head is provided with a pre-guide groove that guides airflow into the combustion chamber during the opening of the intake valve. The pre-guide groove is located within the combustion chamber and closely adjacent to the intake valve seat. The lower wall of the intake duct is provided with a guide boss located at the throat of the intake duct and configured to reduce the cross-sectional area of ​​the throat. During the intake stroke, the airflow passes through the guide boss and pre-guide groove, resulting in a single concentration and a double acceleration, thereby significantly improving the tumble ratio within the combustion chamber.

Description

Technical Field

[0001] The present invention relates to the field of engine structure design, and in particular to an engine air intake structure and an automobile. Technical Background

[0002] In an engine's cylinder head, the combustion chamber and intake duct play a crucial role in combustion. Patent number CN105673248, published on June 15, 2016, discloses an intake duct for a gasoline engine cylinder head with a high tumble ratio. This design incorporates two independent intake ducts, each slightly protruding toward the cylinder head bottom surface to increase intake flow velocity. The throat of the intake duct utilizes two straight lines with a rounded transition between them, improving the tumble ratio but altering the intake duct flow coefficient. Patent number CN207437238U, published on June 1, 2018, discloses a high tumble ratio intake duct structure. This design modifies the intake duct structure, with the cross-sections of the first and last sections decreasing sequentially. This improves the engine's tumble ratio by enhancing the mixing uniformity of the air and oil spray within the intake duct, but the degree of improvement is limited.

[0003] Tumble ratio and flow coefficient are two major performance indicators of an intake duct. A higher tumble ratio results in more even mixing of airflow and fuel particles, faster flame propagation, and more complete and clean combustion, resulting in fuel savings and emissions reductions. The flow coefficient determines the amount of air entering the engine; a higher flow coefficient yields higher engine power. However, in engine intake structures, the flow coefficient and tumble ratio exhibit a trade-off, necessitating a design that combines a high tumble ratio with a high flow coefficient. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, an intake structure with a high tumble ratio and a large flow coefficient is provided. The present invention discloses an intake structure of an engine, and its specific technical solution is as follows.

[0005] An engine intake structure includes a cylinder head, an intake valve seat mounted on the cylinder head, an intake duct connected to the intake valve seat, and an intake valve that cooperates with the intake valve seat to seal the intake duct and a combustion chamber, wherein the intake duct guides airflow through the intake valve seat and then into the combustion chamber.

[0006] The cylinder head is provided with a pre-guide groove, which guides the airflow into the combustion chamber during the opening of the intake valve. The pre-guide groove is located in the combustion chamber and close to the intake valve seat ring; the lower wall of the intake duct is provided with a diversion boss, which is located at the throat of the intake duct and is used to reduce the cross-sectional area of ​​the throat.

[0007] Furthermore, the pre-guide groove is away from the drainage boss.

[0008] Furthermore, the pre-guide groove is crescent-shaped and extends toward the exhaust valve seat ring.

[0009] Furthermore, the pre-guide groove is symmetrically arranged along a line connecting a center point of the intake valve seat ring and a center point of the exhaust valve seat ring.

[0010] Furthermore, the pre-guide groove and the cylinder cover are integrally formed.

[0011] Furthermore, the drainage boss includes a curved surface for guiding the airflow to flow toward two sides of the drainage boss.

[0012] Furthermore, the angle between the air inlet of the air inlet duct and the center line of the air inlet duct is 45° to 70°.

[0013] In addition, the present invention also provides a car, comprising the above-mentioned air intake structure.

[0014] Beneficial effects: 1. The present invention provides an intake structure of an engine, wherein a guide boss is provided at the throat position of the lower wall of the intake duct. When the air flow passes through the intake duct and enters the combustion chamber, after the air flow passes through the guide boss, a part of the air flow is concentrated in the area away from the guide boss, which can accelerate the flow to the combustion chamber; and in the process of air intake in the combustion chamber, as the intake valve gradually opens, the air flow enters the combustion chamber in advance through the pre-guide groove, so that the air flow velocity is further accelerated; the tumble ratio in the combustion chamber can be improved by concentrating the air flow once and accelerating it twice; and because the pre-guide groove pre-conducts the air flow entering the combustion chamber, the air flow enters the combustion chamber in advance, which increases the gas flow entering the combustion chamber, and the flow coefficient is also improved at the same time.

[0015] 2. The present invention provides an intake structure for an engine, wherein the pre-guide groove is away from the guide boss, and the airflow is concentrated in the area toward the pre-guide groove after passing through the guide boss. During the opening of the intake valve, the concentrated airflow increases the intake amount passing through the pre-guide groove, further increases the flow rate of the airflow, and thus increases the tumble ratio in the combustion chamber.

[0016] 3. The present invention provides an intake structure for an engine, which directs airflow toward both sides of the guide boss through the curved surface of the guide boss, thereby reducing the impact of the airflow on the valve post, thereby reducing the volume of gas rebounding due to the impact on the valve post; by reducing the volume of the rebound gas, the impact on the flow velocity of the airflow when flowing to the combustion chamber is reduced, thereby ensuring the tumble ratio in the combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view of the air intake duct according to an embodiment of the present invention;

[0018] Figure 2for Figure 1 Schematic cross-section of the middle BB;

[0019] Figure 3 is a side view of an air intake duct according to an embodiment of the present invention;

[0020] Figure 4 for Figure 3 Schematic diagram of the cross section of AA;

[0021] Figure 5 for Figure 3 Enlarged schematic diagram of the middle C area;

[0022] Figure 6 This is a front view of the air intake structure in an embodiment of the present invention;

[0023] Figure 7 for Figure 6 A magnified schematic diagram of area A in the middle;

[0024] Figure 8 A bottom view of a cylinder head according to an embodiment of the present invention;

[0025] Figure 9 for Figure 8 A magnified schematic diagram of area B in the middle;

[0026] Figure 10 1 is a comparison diagram of the tumble ratios of the intake structures of the present invention and those of the intake structures not adopting the present invention in the embodiments of the present invention.

[0027] Figure numerals: 1-intake duct; 11-upper wall; 12-lower wall; 13-intake port; 14-guiding boss; 15-intake duct head section; 16-intake duct tail section; 21-valve post; 22-intake valve; 3-cylinder head; 31-combustion chamber; 32-intake valve seat; 33-pre-guide groove; 34-exhaust valve seat. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0029] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions 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 devices or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance; in addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] like Figure 4 and Figure 6 As shown, an intake structure of an engine includes a cylinder head 3, an intake valve seat 32 mounted on the cylinder head 3, an intake duct 1 connected to the intake valve seat 32, and an intake valve 22 cooperating with the intake valve seat 32 to seal the intake duct 1 and a combustion chamber 31. The intake duct 1 guides airflow through the intake valve seat 32 and then enters the combustion chamber 31.

[0032] The cylinder head 3 is provided with a pre-guide groove 33, which guides the airflow into the combustion chamber 31 during the opening of the intake valve 22. The pre-guide groove 33 is located in the combustion chamber 31 and close to the intake valve seat ring 32; the lower wall 12 of the intake duct 1 is provided with a guide boss 14, which is located at the throat of the intake duct 1 and is used to reduce the cross-sectional area of ​​the throat.

[0033] In this embodiment, the airflow passes through the air inlet 13 of the air inlet 1 and then flows into the combustion chamber 31. Figure 4As shown, the intake duct 1 includes an upper wall 11 and a lower wall 12. The upper wall 11 refers to the upper surface area in the vertical direction of the intake duct, and the lower wall 12 refers to the lower surface area in the vertical direction of the intake duct. A guide boss 14 is provided on the lower wall 12 of the intake duct 1. The guide boss 14 protrudes toward the upper wall 11 of the intake duct 1. The guide boss 14 is located at the throat of the intake duct 1, so that the airflow is concentrated in the area away from the guide boss 14, further reducing the cross-sectional area at the throat of the intake duct 1, thereby accelerating the airflow entering the combustion chamber 31. During the intake process of the combustion chamber 31, the airflow passing through the throat of the intake duct 1 passes through the intake valve seat 32 and then enters the combustion chamber 31. A pre-guide groove 33 is provided on the cylinder head 3, as shown in FIG. Figure 6 and Figure 7 The pre-guide groove 33 is located within the combustion chamber 31 and is in close proximity to the intake valve seat 32. When the intake valve 22 gradually opens from a closed state, a gap initially appears between the intake valve 22 and the cylinder head 3 in the area where the pre-guide groove 33 is located. Airflow enters the combustion chamber 31 through this gap. Because the pre-guide groove pre-directs the airflow entering the combustion chamber, it enters the combustion chamber earlier, increasing the gas flow rate entering the combustion chamber and improving the flow coefficient. As the intake valve 22 continues to open, the gap between the intake valve 22 and the cylinder head 3 in the area where the pre-guide groove 33 is located increases, and the airflow velocity at the pre-guide groove 33 also increases, resulting in a faster airflow. At this time, however, no airflow or very low airflow velocity exists in the cylinder head 3 without the pre-guide groove 33. In contrast, the cylinder head 3 with the pre-guide groove 33 exhibits a higher gas flow velocity at the same moment.

[0034] In this embodiment, during the engine's intake stroke, the airflow is accelerated by the guide boss 14 and the pre-guide groove 33, causing the airflow entering the combustion chamber 31 to form a strong tumble flow, thereby increasing the tumble ratio within the combustion chamber 31. This achieves rapid combustion and reduces the engine's fuel consumption.

[0035] In this embodiment, to facilitate understanding of the location of the pre-guide groove 33, the pre-guide groove 33 can be viewed as a crescent-shaped structure formed by removing a portion of metal from the cylinder head 3, located adjacent to the intake valve seat 32, extending toward the exhaust valve seat 34. The crescent-shaped pre-guide groove 33 is symmetrically arranged along the line connecting the center points of the intake valve seat 32 and the exhaust valve seat 34. The presence of the pre-guide groove 33 increases the gap between the intake valve 22 and the cylinder head 3 in the area where the pre-guide groove 33 is located during the opening of the intake valve 22, thereby increasing the airflow velocity at the pre-guide groove 33 and resulting in a faster airflow. Specifically, during the manufacturing process of the cylinder head 3, the pre-guide groove 33 is integrally formed with the cylinder head 3.

[0036] like Figure 4 and Figure 6 As shown, the pre-guide groove 33 is far away from the guide boss 14. Specifically, the guide boss 14 is arranged on the lower wall 12 of the intake duct 1, and the pre-guide groove 33 is close to the upper wall 11 of the intake duct 1. After passing through the guide boss 14, the airflow is concentrated toward one side of the area where the pre-guide groove 33 is located. The concentrated airflow increases the intake volume of the pre-guide groove 33, further accelerates the flow rate of the airflow through the pre-guide groove 33, thereby improving the tumble ratio in the combustion chamber 31.

[0037] In the engine's intake structure, the intake valve 22 is connected to the valve stem 21, which is located at the center of the intake valve seat 32. As airflow passes through the intake valve seat 32 and enters the combustion chamber 31, a portion of the airflow will impact the valve stem 21, causing rebound, thereby affecting the airflow velocity. In this embodiment, the guide boss 14 includes a curved surface that guides the airflow toward both sides of the guide boss 14. Airflow entering the intake duct 1 first contacts this curved surface, thereby guiding the airflow toward both sides of the guide boss 14. This increases the airflow velocity while reducing the amount of airflow impacting the valve stem 21, thereby minimizing the impact on the airflow velocity and ensuring the tumble ratio within the combustion chamber 31.

[0038] like Figure 2-5 As shown, in this embodiment, the width W of the guide boss 14 is in the range of 5 to 12 mm, the length L is in the range of 15 to 20 mm, and the height H is in the range of 2 to 5 mm. The width refers to the longest distance between the two sides of the curved surface of the guide boss 14, the length refers to the longest distance between the contact surface of the guide boss 14 and the lower wall 12 in the air intake direction, and the height refers to the height of the guide boss 14 at its highest point relative to the lower wall 12 of the intake duct 1.

[0039] like Figure 4 As shown, in this embodiment, the air intake duct 1 includes an integrally formed air intake duct head section 15 and an air intake duct tail section 16, and the angle between the air inlet 13 of the air intake duct head section 15 and the center line of the air intake duct tail section 16 is 45° to 70°.

[0040] In this embodiment, during the engine's intake stroke, air first enters the intake duct 1 from the intake port 13. After passing through the guide boss 14, a portion of the air entering the intake duct 1 is lifted and concentrated toward the side where the pre-guide groove 33 is located. The guide boss 14 also reduces the cross-sectional area of ​​the flow, accelerating the airflow. This allows the airflow at the throat to flow quickly and concentratedly through the intake valve seat 32. The remaining air is concentrated toward the sides of the guide boss 14, minimizing impact on the valve stem 21 and thus reducing the impact on the airflow velocity. During the opening of the intake valve 22, the airflow passing through the intake valve seat 32 is pre-guided by the pre-guide groove 33, further accelerating the airflow. This primary airflow concentration and secondary airflow acceleration creates a strong tumble flow upon entering the combustion chamber 31, increasing the tumble ratio within the combustion chamber 31. This results in rapid combustion and lowers engine fuel consumption.

[0041] like Figure 10 As shown, the tumble ratios of the intake structures using the present invention and not using the present invention are compared, wherein the tumble ratio of the intake structure using the present invention is obtained after optimization, and the tumble ratio of the intake structure not using the present invention is obtained before optimization. The difference in tumble ratios can be clearly seen, with an increase of 47% at the second peak of the tumble ratio.

[0042] The table below compares airflow velocities at different locations on cylinder heads 3 using the present invention with those not using it. The present invention increases airflow velocity at the throat by 60%, at the intake valve seat 32 by 108%, and at the pre-guide groove 33 by 300%. This increase in airflow velocity at these locations enhances the tumble ratio and improves the flow coefficient by 8%.

[0043] throat Intake valve seat Pre-guide groove Tumble ratio Flow coefficient Application of the present invention 40m / s 123m / s 68m / s 2.8 0.39 The present invention is not applied 25m / s 59m / s 17m / s 1.9 0.36 promote 60％ 108％ 300％ 47％ 8％

[0044] Example 2

[0045] This embodiment discloses a car, which includes the intake structure disclosed in Example 1, so that the tumble ratio in the combustion chamber 31 of the car engine is improved, the air and fuel are fully mixed, the combustion speed is increased, and the fuel consumption is reduced.

[0046] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. Those skilled in the art will recognize that several equivalent substitutions or obvious modifications can be made without departing from the scope of the present invention, and that any equivalent performance or application should be considered to fall within the scope of protection of the present invention.

Claims

1. An intake structure of an engine, comprising a cylinder head (3), an intake valve seat (32) mounted on the cylinder head (3), an intake duct (1) connected to the intake valve seat (32), and an intake valve (22) cooperating with the intake valve seat (32) to close the intake duct (1) and a combustion chamber (31), wherein the intake duct (1) guides airflow through the intake valve seat (32) and then enters the combustion chamber (31); It is characterized by: The cylinder head (3) is provided with a pre-guide groove (33), and the pre-guide groove (33) guides the air flow into the combustion chamber (31) during the opening process of the intake valve (22), and the pre-guide groove (33) is located in the combustion chamber (31) and is close to the intake valve seat ring (32); the lower wall surface (12) of the intake duct (1) is provided with a guide boss (14), and the guide boss (14) is located at the throat of the intake duct (1) and is used to reduce the cross-sectional area of ​​the throat; The pre-guide groove (33) is close to the upper wall surface (11) of the air inlet duct (1) and away from the guide boss (14); the guide boss (14) protrudes toward the upper wall surface (11) of the air inlet duct (11), so that the air flow is concentrated toward one side of the area where the pre-guide groove (33) is located after passing through the guide boss (14); The width W of the drainage boss (14) is within the range of 5 to 12 mm, the length L is within the range of 15 to 20 mm, and the height H is within the range of 2 to 5 mm; The angle between the air inlet (13) of the air inlet duct (1) and the center line of the air inlet duct (1) is 45° to 70°.

2. The air intake structure of an engine according to claim 1, characterized in that: The pre-guide groove (33) is crescent-shaped and extends in the direction of the exhaust valve seat ring (34).

3. The air intake structure of an engine according to claim 2, characterized in that: The pre-guide groove (33) is symmetrically arranged along a line connecting the center point of the intake valve seat ring (32) and the center point of the exhaust valve seat ring (34).

4. An engine air intake structure according to any one of claims 1 to 3, characterized in that: The pre-guide groove (33) and the cylinder cover (3) are integrally formed.

5. The air intake structure of an engine according to claim 1, characterized in that: The flow-guiding boss (14) comprises a curved surface for guiding the airflow to flow toward two sides of the flow-guiding boss (14).

6. An automobile, characterized in that: It comprises the air intake structure according to any one of claims 1 to 5.

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