KR20030039466A - Intake port apparatus - Google Patents

Abstract

PURPOSE: A structure of intake port of an engine is provided to minimize fluctuation of flow rate of fuel-air mixture. CONSTITUTION: An intake port is formed by sand core method during process manufacturing a metal mold for forming a cylinder head. 2 deg. of a snap slope is formed in vertical direction to allow easy separation of the mold. Sectional area of the intake port is gradually reduced from a flange part(41) to a middle part(42). A fuel injecting part(43) is widely formed on an upper side of the flange part. Height of the fuel injection part is gradually reduced to approximately 30mm so that a central part thereof is formed flat on the middle part. A branched part(44) is formed on a downstream of the middle part of the intake port so that two valves are mounted on a combustion chamber. Section of the branched part is changed from a square with convex sides to an approximate circle with rounded corners. Valve guide parts(45) are formed on an upper side of the branched parts of the intake port. Sectional area is gradually increased from the valve guide part to a valve seat part(46).

Description

Engine intake port structure

The present invention relates to the structure of an engine intake port, and more particularly, to increase the cross-sectional area of the flange portion of the intake port for the mixer to enter the combustion chamber, and to improve the cross-sectional area of the middle portion closer to a quadrangle, and to make the cross-sectional area of the middle portion uniform. It relates to the structure of the engine intake port to minimize the speed change of the mixer.

In general, in the gasoline injection engine, the intake port is formed in the cylinder head 10 as shown in FIG. 7, and the inlet side of the intake port 20 communicates with the intake manifold, and the outlet side thereof is connected to the combustion chamber of the cylinder. Connected to communicate. That is, the intake port 20 is a passage through which a mixture of fuel air can be sucked into the combustion chamber of the cylinder according to the opening of the intake valve and the lowering operation of the piston.

In particular, the intake port 20 is formed by a sand core method when manufacturing the cylinder head, in consideration of the position of the water jacket of the cylinder head 10, the position of the head bolt, the mounting position of the valve, etc. Appropriate position and shape are determined.

As described above, the shape of the intake port 20 is differently formed to suit the characteristics of each engine, and studies to develop more efficient intake ports are being actively conducted.

8 and 9 are views showing the shape and cross-sectional area of the intake port formed in one engine currently being applied. The intake port 20 is formed in a streamlined shape as shown in FIG. 8 so that flow is generated in the mixer introduced into the combustion chamber according to the operating region of the engine, and the size of each cross-sectional area is formed to have various cross-sectional areas as shown in the graph of FIG. 9. do. That is, the cross-sectional area of the inlet port 21 inlet portion 21 is wider than the rear portion at about 1080 mm2, and the cross-sectional area at 10 mm is rapidly reduced to about 830 mm2, and widens at about 950 mm2 at 30 mm and then branches to both sides. The intermediate portion 22 from the 40 mm point to the 60 mm point has a cross-sectional area of about 900 mm 2, narrowed down to about 850 mm 2 at the 70 mm point, and then expanded to about 960 mm 2 at the outlet 23.

However, in the case of the engine in which the intake port is applied as shown in the above example, the speed change of the mixer was large, and the fuel was wetted on the wall surface of the intake port during the fuel injection. There was a problem that a crack occurs in the cylinder head in the process of processing the part.

Therefore, the present invention has been made in order to solve the above problems, and the cross-sectional area of the middle part is equalized overall by increasing the cross-sectional area of the flange portion of the intake port for the mixer to enter the combustion chamber, and improving the cross-sectional area shape of the middle part closer to the square. The purpose is to provide a structure of the engine intake port to minimize the speed change of the mixer.

The present invention as a means for achieving the above object,

In the intake port formed in the cylinder head so that the mixer flows into the combustion chamber of the engine,

The cross-sectional area is gradually reduced from the flange portion of the intake port to the middle portion, and a mountain-shaped fuel injection portion is widely formed above the flange portion having a cross-sectional track shape, and after the middle portion of the intake port, A branch portion is formed so that two valves can be mounted, a valve guide portion is formed above the branched intake port, and a cross-sectional area from the guide portion to the valve seat portion is gradually enlarged.

1 is a view showing the shape of the intake port according to the present invention.

Figure 2 is a graph showing the cross-sectional area of the intake port according to the present invention.

Figure 3 is a cross-sectional view of the cylinder head formed intake port according to the present invention.

Figure 4 is a view showing the outer shape of the intake port according to the present invention.

Fig. 5 is a cross-sectional view of the intake port in section A-A.

Fig. 6 is a cross-sectional view of the intake port in section B-B.

7 to 9 are views for explaining the prior art.

※ Explanation of code for main part of drawing

30: cylinder head

40: intake port

41: flange portion

42: middle part

43: fuel injection unit

44: branch

45: valve guide portion

46: valve seat

Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention will be described in detail.

1 is a view showing the shape of the intake port according to the present invention, Figure 2 is a diagram showing a cross-sectional area of the intake port according to the present invention, Figure 3 is a cross-sectional view of the cylinder head is formed intake port according to the present invention 4 is a diagram showing the outer shape of the intake port according to the present invention, FIG. 5 is a cross-sectional shape diagram of the intake port sectioned along the AA line, and FIG. 6 is a cross-sectional shape diagram of the intake port sectioned along the BB line. .

Reference numeral 40 denoted in the figure denotes an intake port formed by the present invention, and reference numeral 30 denotes a cylinder head.

The cylinder head 30 is manufactured as in the conventional method, and the shape and size of the other parts except the shape of the intake port are formed as in the prior art.

The intake port 40 is formed by a sand core method in the process of manufacturing a mold for molding the cylinder head 30. In this process, it is preferable to give a drawing gradient of 2 ° in the vertical direction to facilitate mold separation.

The intake port 40 formed by the present invention is gradually reduced in cross-sectional area from the flange portion 41 to the middle portion 42. The fuel portion in the shape of an acid is formed above the flange portion 41 in the shape of a track. The sand portion 32 is formed wider than in the related art. And the cross-sectional shape is " "The fuel injection portion 43 started in shape has a shape in which the height decreases gradually until it reaches a point of about 30 mm and reaches the middle portion 42 so that the center portion is blunt.

And the middle portion 42 is branched to both sides so that two valves can be mounted in one combustion chamber as in the prior art, the cross-sectional shape of the branch portion 44 branched to both sides is rounded corners on the square convex outward Being " Is formed into a shape.

In particular, the valve guide portion 45 for the valve guide is provided above the branch 44 is formed.

And the sum of the cross-sectional areas from the valve guide portion 45 to the valve seat portion 46 is formed to gradually increase, so that the resistance is minimized when the mixer is introduced into the combustion chamber.

2 shows a cross-sectional area according to an embodiment of the intake port according to the present invention. The cross-sectional area of the flange portion 41 starts at about 1180 mm 2 and gradually decreases to about 30 mm. In the intermediate portion 42, which is a section of 30 mm to 60 mm, the size of the cross-sectional area is formed so as not to deviate significantly from about 850 mm 2, and gradually increases after about 60 mm to the cross-sectional area of the valve seat portion 46 at about 1100 mm 2. This leads to.

Referring to the operation state of the intake port configured as described above is as follows.

Intake port 40 according to the present invention is increased by about 10% compared to the conventional flange portion 41 and the area of the intermediate portion 42 is set equally, thereby minimizing the speed change of the mixer.

Unlike the related art, the cross-sectional area of the valve seat 46 is increased compared to the conventional art, thereby minimizing resistance when the mixer flows into the combustion chamber.

Therefore, the filling efficiency of the intake air, which is proportional to the performance of the engine, is increased by changing the cross-sectional area and changing the shape of the intake port as described above.

In addition, since the shape of the inlet portion is wider than that of the related art, the wetness of the fuel on the inner wall of the intake port during fuel injection is prevented, and the generation of hydrocarbons due to unburned fuel is reduced.

In particular, the shape of the valve guide portion 45 is also conventionally processed by processing, but is processed in the material, thereby preventing cracks in the cylinder head generated when the guide is pressed.

Therefore, the present invention minimizes the speed change of the mixer in the process of introducing the mixer into the combustion chamber, increases the filling efficiency of the intake air, and the inlet is formed wide to prevent the fuel from wetted on the inner wall of the intake port during fuel injection. Not only is the generation of hydrocarbons reduced, but there is a great advantage that the crack of the cylinder head is prevented.

Claims (2)

In the intake port formed in the cylinder head so that the mixer flows into the combustion chamber of the engine, From the flange portion 41 to the middle portion 42 of the intake port 40, its cross-sectional area is gradually reduced, and the fuel injection portion 43 is formed on the top of the flange portion 40 having a cross-sectional shape. Widely formed, after the middle portion 42 of the intake port 40, a branch 44 is formed so that two valves can be mounted in one combustion chamber, the valve to the upper side of the branched intake port 40 A guide part (45) is formed, and the structure of the engine intake port, characterized in that the cross-sectional area from the valve guide part (45) to the valve seat part (46) is gradually enlarged. The method of claim 1, The cross-sectional shape of the branch portion 44 is a structure of the engine intake port, characterized in that the rounded corners in the shape of a square convex outward.