A cylinder head structure for a motorcycle engine

Abstract

This utility model belongs to the technical field of motorcycle parts, and relates to a cylinder head structure for a motorcycle engine, including a combustion chamber, a spark plug, an intake assembly, and an exhaust assembly. The intake assembly includes an intake port and an intake valve. The intake port includes a main intake passage and an auxiliary intake passage. The main intake passage is arc-shaped and connects to the combustion chamber. The auxiliary intake passage is located on one side of the main intake passage and connects to the main intake passage. The cross-sectional area of ​​the auxiliary intake passage is smaller than that of the main intake passage. The connection between the main intake passage and the auxiliary intake passage is located on the outer side of the intake valve travel. The cylinder head structure for a motorcycle engine provided by this utility model can enhance the tumble effect and improve combustion efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of motorcycle parts and relates to a cylinder head structure for a motorcycle engine. Background Technology

[0002] Motorcycle engine cylinder heads contain intake valves, exhaust valves, intake valve seats, exhaust valve seats, intake ports, exhaust ports, intake passages, and exhaust passages. Among these, the air passages are key to forming different airflow movements. These airflow movements have a decisive influence on the movement pattern of the gas, the amount of air entering the cylinder, and the combustion process, thereby affecting the engine's power, economy, combustion noise, and harmful exhaust emissions. Utility Model Content

[0003] This invention addresses the shortcomings of existing technologies by providing a cylinder head structure for a motorcycle engine that enhances tumble flow and improves combustion efficiency.

[0004] To solve the above-mentioned technical problems, the objective of this utility model is achieved through the following technical solution:

[0005] A cylinder head structure for a motorcycle engine includes a combustion chamber, a spark plug, an intake assembly, and an exhaust assembly. The intake assembly includes an intake port and an intake valve. The intake port includes a main intake passage and an auxiliary intake passage. The main intake passage is arc-shaped and connects to the combustion chamber. The auxiliary intake passage is located on one side of the main intake passage and connects to the main intake passage. The cross-sectional area of ​​the auxiliary intake passage is smaller than that of the main intake passage. The connection between the main intake passage and the auxiliary intake passage is located on the outer side of the intake valve travel.

[0006] In the cylinder head structure of the motorcycle engine described above, the intake openings of both the main intake manifold and the auxiliary intake manifold are located on the intake end face of the cylinder head, and the auxiliary intake manifold is located on the side closer to the combustion chamber.

[0007] In the cylinder head structure of the motorcycle engine described above, the main intake manifold bends toward the combustion chamber and connects to the combustion chamber, and the auxiliary intake manifold is arranged radially along the cylinder head and extends through the main intake manifold.

[0008] In the cylinder head structure of the motorcycle engine described above, the auxiliary air intake has a flat cross-section, and the long side of the flat structure extends parallel to the main air intake.

[0009] In the cylinder head structure of the motorcycle engine described above, preferably, the auxiliary air intake is located at the position corresponding to the middle of the main air intake.

[0010] In the cylinder head structure of the motorcycle engine described above, preferably, the auxiliary air intake duct is provided with an irregular variable diameter or curved surface structure.

[0011] In the cylinder head structure of the motorcycle engine described above, the ratio of the cross-sectional area of ​​the main intake manifold to that of the auxiliary intake manifold is 10:1 to 5:1.

[0012] In the cylinder head structure of the motorcycle engine described above, the connection between the auxiliary air intake and the main air intake is located on the side of the main air intake closer to the combustion chamber.

[0013] In the above-mentioned cylinder head structure of a motorcycle engine, the cylinder head is connected to the cylinder block and crankcase by four cylinder head bolts. The cylinder head is provided with mounting posts adapted to the cylinder head bolts. A reinforcing plate is provided on the top of the mounting posts. The reinforcing plate has four connecting ends, and each connecting end is provided with a mounting hole for the cylinder head bolts to pass through. Preferably, the reinforcing plate has an X-shaped structure.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] This invention provides a cylinder head structure for a motorcycle engine, which improves the air intake structure of the engine by adopting a dual-air intake, thereby increasing the intake volume. At the same time, an auxiliary air intake is provided, which is connected to the side wall of the main air intake. The gas enters the main air intake through the auxiliary air intake and disturbs the gas in the main air intake to enhance tumble flow, thereby indirectly improving combustion efficiency and providing further support for the engine's power and economy. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is a perspective view of the present invention from another angle;

[0018] Figure 3 This is a cross-sectional view (casting) of this utility model;

[0019] Figure 4 This is a structural diagram of the reinforcing plate of this utility model;

[0020] Reference numerals: 1. Combustion chamber; 2. Spark plug; 3. Intake port; 4. Intake valve; 5. Main intake manifold; 6. Auxiliary intake manifold; 7. Cylinder head bolt; 8. Mounting post; 9. Reinforcing plate; 10. Connecting end; 11. Mounting hole. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-4 :

[0022] A cylinder head structure for a motorcycle engine includes a combustion chamber 1, a spark plug 2, an intake assembly, and an exhaust assembly. The intake assembly includes an intake port 3 and an intake valve 4. The intake port 3 includes a main intake passage 5 and an auxiliary intake passage 6. The main intake passage 5 is arc-shaped and connects to the combustion chamber 1. The auxiliary intake passage 6 is located on one side of the main intake passage 5 and connects to the main intake passage 5. The cross-sectional area of ​​the auxiliary intake passage 6 is smaller than that of the main intake passage 5. The connection between the main intake passage 5 and the auxiliary intake passage 6 is located on the outer side of the travel of the intake valve 4.

[0023] In this embodiment, when the engine intake valve 4 is activated, the gas mainly enters the combustion chamber 1 through the main intake duct 5. At the same time, some gas enters through the auxiliary intake duct 6 with a smaller diameter. The airflow entering through the auxiliary intake duct 6 disturbs the mainstream gas in the main intake duct 5, disrupts the laminar flow state, and significantly enhances the tumble intensity of the gas entering the combustion chamber 1, that is, forms a stronger air rotation motion. The enhanced tumble promotes the mixing of fuel and air, increases the turbulence intensity in the combustion chamber 1, and thus indirectly improves combustion efficiency and speed.

[0024] Furthermore, the intake openings of both the main intake duct 5 and the auxiliary intake duct 6 are located on the intake end face of the cylinder head, and the auxiliary intake duct 6 is located on the side close to the combustion chamber 1. The above layout can shorten the transmission path of the disturbed airflow, ensure that the airflow acts efficiently on the core flow area of ​​the main intake duct 5, and reduce the loss of airflow kinetic energy.

[0025] Furthermore, the main intake duct 5 bends toward the combustion chamber 1 and connects to the combustion chamber 1, and the auxiliary intake duct 6 is arranged radially along the cylinder head and extends through the main intake duct 5; the above layout can generate high-intensity shear vortices and improve tumble intensity.

[0026] The cross-section of the aforementioned auxiliary air intake 6 is a flat structure, and the extension direction of the long side of the flat structure is parallel to that of the main air intake 5; the airflow of the flat structure can act on the main airflow over a wider range.

[0027] Preferably, the auxiliary air intake duct 6 is located at the position corresponding to the middle of the main air intake duct 5.

[0028] Preferably, the auxiliary air intake duct 6 is provided with an irregular variable diameter or curved surface structure, which can induce local turbulence.

[0029] Preferably, the ratio of the cross-sectional area of ​​the main air intake 5 to the auxiliary air intake 6 is 10:1 to 5:1.

[0030] The connection between the auxiliary air intake duct 6 and the main air intake duct 5 is located on the side of the main air intake duct 5 near the combustion chamber 1. The design near the combustion chamber 1 allows the turbulent airflow to be directly transmitted to the intake valve 4.

[0031] This embodiment further increases the structural strength of the cylinder head. The cylinder head is connected to the cylinder block and crankcase by four cylinder head bolts 7. The cylinder head is provided with mounting posts 8 that are adapted to the cylinder head bolts 7. The top of the mounting posts 8 is provided with a reinforcing plate 9. The reinforcing plate 9 has four connecting ends 10, and each connecting end 10 is provided with a mounting hole 11 for the cylinder head bolts 7 to pass through. Preferably, the reinforcing plate 9 has an X-shaped structure. Through the connecting effect of the reinforcing plate 9, the cylinder head deformation caused by high temperature and high pressure can be greatly reduced.

[0032] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A cylinder head structure for a motorcycle engine, comprising a combustion chamber (1), a spark plug (2), an intake assembly, and an exhaust assembly, wherein the intake assembly comprises an intake port (3) and an intake valve (4), characterized in that, The air intake (3) includes a main air intake (5) and an auxiliary air intake (6). The main air intake (5) is arranged in an arc shape and connects to the combustion chamber (1). The auxiliary air intake (6) is arranged on one side of the main air intake (5) and connects to the main air intake (5). The cross-sectional area of ​​the auxiliary air intake (6) is smaller than that of the main air intake (5). The connection between the main air intake (5) and the auxiliary air intake (6) is located on the outside of the travel of the intake valve (4).

2. The cylinder head structure of a motorcycle engine according to claim 1, characterized in that, The intake openings of the main intake manifold (5) and the auxiliary intake manifold (6) are both located on the intake end face of the cylinder head, and the auxiliary intake manifold (6) is located on the side close to the combustion chamber (1).

3. The cylinder head structure of a motorcycle engine according to claim 1, characterized in that, The main intake passage (5) bends toward the combustion chamber (1) and connects to the combustion chamber (1), and the auxiliary intake passage (6) is arranged radially along the cylinder head and extends through the main intake passage (5).

4. The cylinder head structure of a motorcycle engine according to claim 3, characterized in that, The auxiliary air intake (6) has a flat cross-section, and the long side of the flat structure extends parallel to the main air intake (5).

5. The cylinder head structure of a motorcycle engine according to claim 1, characterized in that, The ratio of the cross-sectional area of ​​the main air intake (5) to that of the auxiliary air intake (6) is 10:1 to 5:

1.

6. The cylinder head structure of a motorcycle engine according to claim 1, characterized in that, The connection between the auxiliary air intake (6) and the main air intake (5) is located on the side of the main air intake (5) closer to the combustion chamber (1).

7. The cylinder head structure of a motorcycle engine according to claim 1, characterized in that, The cylinder head is connected to the cylinder block and crankcase by four cylinder head bolts (7). The cylinder head is provided with mounting posts (8) that are adapted to the cylinder head bolts (7). The top of the mounting posts (8) is provided with a reinforcing plate (9). The reinforcing plate (9) has four connecting ends (10). Each connecting end (10) is provided with a mounting hole (11) through which the cylinder head bolts (7) pass.

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