KR20040050300A - Intake port of cylinder head - Google Patents

Abstract

PURPOSE: An intake port of a cylinder head is provided to facilitate the combustion in a combustion chamber by enhancing the generation of a tumble and a swirl in the combustion chamber and to enhance the low-speed torque and the maximum torque by elevating the combustion speed. CONSTITUTION: An intake port(400) and an exhaust port are formed outside a combustion chamber. The pipe inclination of the intake port is formed to generate flow lamination when mixed gas flows into the combustion chamber and a tumble while limiting the mixed gas flow at a lower portion of a valve. At an upper portion(b) of the part contacting to an intake valve, the pipe inclination is an acute angle.

Description

Intake port of the cylinder head {INTAKE PORT OF CYLINDER HEAD}

The present invention relates to an intake port, and more particularly to an intake port of a cylinder head.

Typically, gasoline engines mix air and fuel to burn in a cylinder to convert thermal energy into rotational energy.

As shown in FIG. 1, an intake port 120 is formed in the cylinder head to introduce the cylinder 110 into the outside air and the fuel, and the intake port 120 is connected to the intake manifold.

The shape of the intake port 120 has a large relationship with the speed and direction of the mixer supplied into the cylinder 110, and accordingly, the combustion itself of the mixer in the combustion chamber varies according to the shape of the intake port 120.

That is, the flow state of the intake air is changed according to the shape of the intake port 120, and the flow of the intake air affects the performance of the engine.

The tumble is a flow in which the intake air flows from the upper portion of the cylinder 110 along the intake port 120 and is strongly rotated from the upper portion of the cylinder 110 to the lower portion, thereby affecting the performance of the engine according to the tumble ratio according to the number of revolutions of the tumble. Go crazy.

Here, the tumble ratio is calculated as (tumble rotation speed / engine maximum rotation speed).

However, the tumble rotation speed depends on the shape of the opening of the intake port 120.

The tumble is a boundary of the intake flow and flows into the cylinder 110 space from the intake port 120 that resists the flow, causing a rotation. The intake port 120 is a boundary between the cylinder 110 and the intake port 120. According to the shape of the opening of the tumble will be changed.

As shown in FIG. 2 and FIG. 3, in the intake port 120 according to the prior art, the flow rate Cf is maximized because ⓐ is in a smooth curved form, but the tumble is very small.

For this reason, in the case of the engine having the intake port 120 according to the prior art, the flow rate Cf is maximized, but due to the low tumble, the mixer formation and the combustion speed are not appropriate, and thus, the engine performance cannot be maximally drawn at low and medium speeds. there was.

SUMMARY OF THE INVENTION An object of the present invention is to provide an intake port of a cylinder head capable of raising the tumble as much as possible while maintaining a proper flow rate Cf by causing flow separation to a mixer introduced into a combustion chamber through an intake port.

1 is a view schematically showing the intake port and exhaust port configuration of a typical DOHC engine.

2 and 3 show the intake port shape of the cylinder head according to the prior art.

4 and 5 are views illustrating the intake port shape of the cylinder head according to the embodiment of the present invention.

Figure 6 is a perspective view showing the intake port shape of the cylinder head according to an embodiment of the present invention.

7 is a graph comparing the performance of the engine according to the embodiment of the present invention and the prior art.

In order to achieve the above object, the present invention forms a combustion chamber with a piston head therein, and an intake port and an exhaust port are formed outside thereof, respectively, and an intake valve and an exhaust valve intermittently control the inside of the combustion chamber, and a spark plug is mounted. In the cylinder head of the engine, a flow path of the intake port formed in the cylinder head to limit the flow rate of the mixer in the direction of the valve lower side and to generate a tumble when the inflow of the mixer flowing into the combustion chamber of the engine occurs In forming the inclination, the inclination of the inlet port pipe slope is set to have an acute angle bent at the upper portion in contact with the intake valve.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrative of the invention and are not meant to limit the invention to them. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

4 to 7, the shape of the intake port (stair tumble port) 400 of the cylinder head according to the embodiment of the present invention will be described.

6 is a perspective view of the intake port 400 of the cylinder head according to the embodiment of the present invention viewed from various directions.

7 is a graph comparing the performance of the engine according to the embodiment of the present invention and the prior art. Referring to FIG. 7, the intake port (stair tumble port) 400 of the cylinder head according to the embodiment of the present invention is It can be seen that the mounted engine increases the low speed torque (2000 rpm) by 7% and the maximum torque by 4% compared to the engine equipped with the intake port of the prior art.

An embodiment of the present invention forms an combustion chamber with a piston head therein, and an intake port 400 and an exhaust port are formed outside thereof, and an intake valve and an exhaust valve intermittently control the inside of the combustion chamber, and an engine equipped with a spark plug. In the cylinder head of the engine, flow separation occurs when the mixer flows into the combustion chamber of the engine, thereby restricting the flow rate of the mixer toward the lower surface of the valve and forming a pipe slope of the intake port 400 of the cylinder head to generate a tumble. As shown in FIGS. 4 and 5, the inclination of the inlet port 400 is set to have an acute bent acute angle at an upper portion ⓑ of the portion in contact with the intake valve.

In such a configuration, by forming a flow separation at the inflow of the mixer flowing into the combustion chamber of the engine, it is possible to improve the formation of the mixer according to the tumble flow, and to increase the combustion speed, thereby enabling more stable combustion.

When the mixer is introduced through the intake manifold, the mixer passes through the intake port 400 through the intake valve.

Here, the inclination of the pipe of the intake port 400 is formed to have an acute angle bent at ⓑ as shown in Figs. 4 and 5 when the intake valve for opening and closing the intake port 400 is shown in Fig. As described above, the mixer introduced into the combustion chamber through the intake port 400 generates tumble flow.

Therefore, the mixer introduced through the intake port 400 causes vortexing, and the mixer itself rotates while mixing with the introduced mixer, so that the mixer inside the combustion chamber swirls and tumbles and revolves around the inside of the combustion chamber.

The tumble produced as described above contains energy itself, which helps the combustion of the mixer during the explosion stroke of the engine, and in particular, speeds up propagation of the ignited flame to improve combustion efficiency.

As in the embodiment of the present invention, when the mixer is introduced into the combustion chamber, as shown in FIGS. 4 and 5, the tumble flow is generated in the ⓑ portion, so that the mixer is introduced into the combustion chamber with the rotational force to be tumbled and swirled. By increasing the occurrence of, it is possible to promote the combustion of the combustion chamber.

As described above, the intake port of the cylinder head according to the present invention is introduced into the combustion chamber through the intake port when the inclination of the inlet port is inclined at an acute angle when the pipe slope of the intake port is introduced into the combustion chamber and the tumble of the mixer in the combustion chamber. By increasing the generation of swirl, the combustion of the combustion chamber can be promoted.

In addition, it is possible to increase the low speed torque and the maximum torque by improving the formation of the mixer and increasing the combustion speed.

Claims (1)

In a cylinder head of an engine having an internal combustion chamber together with a piston head, an intake port and an exhaust port are formed outside thereof, and an intake valve and an exhaust valve control the inside of the combustion chamber, and a spark plug is mounted. The flow separation occurs when the mixer is introduced into the combustion chamber of the engine, thereby restricting the flow rate of the mixer in the direction of the lower surface of the valve and forming a slope of the intake port formed in the cylinder head to generate a tumble. The intake port of the cylinder head, characterized in that the inclination of the pipeline is set to have an acute angle bent at the upper portion in contact with the intake valve.