KR19980023705A - Engine intake valve backflow prevention device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake valve backflow prevention device of an engine. In the conventional intake valve of a vehicle, since the setting of the α section for utilizing the inertia effect of air is tuned to a specific engine speed, the piston of the The upward movement causes the air in the cylinder to flow back toward the intech port, i.e. the α section is for high speed engine operation (i.e., because the inertia effect increases as the speed increases). There was a problem that the engine performance is degraded due to air loss.

Therefore, in the present invention, the first and second flaps 104a and 104b are pivoted about the shaft 104c in the direction in which air flows into the intech port 102, and the air in the cylinder is flowed backward. The first and second flaps 104a and 104b extend in the direction of the shaft 104c, and the backflow shielding means 104 is installed to block backflow. Is installed in the direction in which air flows backwards, and when the air flows back from the cylinder to the intech port, it causes the backflow shielding to shut off the airflow in the low speed section. There is an effect that can prevent the degradation of engine performance.

Description

Engine intake valve backflow prevention device.

In general, an intake valve in a cylinder header has two valves per cylinder and is used to inject a mixer or air into a cylinder, which is a function of sealing before opening or compressing to inflate the cylinder at an engine speed. Have

These intake valves operate more powerfully at higher speeds, which is an important part that must be exercised accurately and flexibly.The valve opens quickly and closes slowly when the engine rotates at a low speed, and the valve is in optimum condition at maximum output conditions. Is opened and closed at high speed, the valve opens late and closes quickly and periodically opens and closes the valve to supply air to the cylinder.

In addition, the intake valve is opened at the top dead center (TDC) and after the bottom dead center (BDC) as shown in FIG. 1 for the scavenging effect at the end of the exhaust stroke and the inertia effect at the end of the exhaust stroke. Plays a closed role in.

In other words, the α section in FIG. 1 is a section for utilizing the inertial effect of air, and thus, in most rotational speed regions, the air in the cylinder is caused by the upward movement of the piston. Will flow back.

Conventionally, as shown in Fig. 2, mounted on a cylinder block (not shown) to reciprocate in a cylinder and receive the fluid pressure in the cylinder to transfer the force outwards and convert the force applied back to the pressure of the fluid Piston 100; A combustion chamber (101) formed on the piston (100) to induce combustion between fuel and air; An intech port 102 formed above the combustion chamber 101 to suck a mixer or air into the combustion chamber 101; It is provided with the inlet port 102, and consists of the intake valve 103 which opens and closes the intech port 102 by the reciprocating motion of the piston 100. As shown in FIG.

In the conventional intake valve of a vehicle configured as described above, first, when the engine is started, the timing gear on the cylinder head side connected to the crankshaft and the timing belt rotates by the reciprocating motion of the piston 100, and the timing gear on the cylinder head side. Rotates the camshaft on the intake side.

When the cam shaft rotates, the cam fixed to the cam shaft rotates to contact the intake valve lifter to open the intake valve 103.

In other words, when the piston 100 moves downward, the intake valve 103 is opened and the mixer or air is supplied to the combustion chamber 101 formed at the upper portion of the piston 100 through the intech port 102. When the piston 100 moves upward, the air in the cylinder flows back toward the intech port 102 through the intake valve 103.

However, in the conventional intake valve of a vehicle, as shown in FIG. 1, since the setting of the α section for utilizing the inertia effect of the air is tuned to a specific engine speed, in the most rotational speed region, it is determined by the upward movement of the piston. Air in the cylinder flows back toward the intech port.

That is, since the α section is for the high speed driving state of the engine (that is, the inertia effect increases as the speed increases), there is a problem that the engine performance is deteriorated due to the intake air loss due to the backflow of air in the low speed section.

Accordingly, an object of the present invention is to solve the conventional problems as described above by installing a backflow shielding means that is folded in the direction in which air is introduced into the in-tech port and spread in the direction in which the air flows back to the in-tech port from the cylinder When the air flows back, it causes the backflow shielding means to block the engine performance due to the backflow of air in the low speed section, and in the carburetor engine, it blocks the backflow of air during valve overlap. It is to provide an intake valve backflow prevention device of the engine that can improve the performance of the engine.

An object of the present invention is to provide an intake valve backflow prevention device of an engine, in which a first and a second flap are folded around the shaft in a direction in which air flows into an intech port, and a direction in which air in the cylinder flows back. First, the second flap can be achieved by installing a backflow shielding means for extending the center of the shaft to block the backflow.

In the present invention, when the air flows into the cylinder from the in-tech port, the first and second flaps of the backflow shielding means are folded about the shaft so that the air flows back to the in-tech port without causing the air to flow. When flowing, the first and second flaps are unfolded by the backflowing air to close the intech port so that the flow is interrupted and the first and second flaps block it when the air flows back toward the intech port. It is possible to effectively achieve the above object while preventing the performance degradation of the engine, which may occur due to loss of intake air due to backflow of air in the section.

1 is a configuration diagram for explaining the opening and closing operation of the intake valve in the exhaust stroke terminal of a typical vehicle.

Figure 2 is a block diagram showing an operation state of the intake valve mounted to the in-tech port in the conventional automobile engine.

Figure 3 is a block diagram showing an intake valve backflow prevention device of the engine of the present invention,

(A) is an explanatory view of the backflow prevention device when the flow proceeds from the intech port into the cylinder during the downward movement of the piston,

(B) is an explanatory view of the backflow prevention device when a backflow occurs due to the upward movement of the piston and flow occurs from the cylinder to the intech port.

Explanation of symbols for the main parts of the drawings

100: piston 101: combustion chamber

102: Intech port 103: Intake valve

104: countercurrent shielding means 104a, 104b: first and second flaps

103c: shaft

Hereinafter, with reference to the accompanying drawings, the technical configuration and operation effects as a preferred embodiment that can effectively achieve the object of the present invention will be described.

Figure 3 is a block diagram showing the intake valve backflow prevention device of the present invention vehicle engine, (a) is an explanatory view of the backflow prevention device when the flow proceeds into the cylinder from the in-tech port during the downward movement of the piston, (b) It is an explanatory view of a backflow prevention device when a backflow occurs due to an upward movement of a piston and a flow occurs from an cylinder to an intech port.

According to the present embodiment, the piston 100 is mounted to the cylinder block to reciprocate in the cylinder and receives the fluid pressure in the cylinder to transfer the force out and reversely applied force to the pressure of the fluid; A combustion chamber (101) formed on the piston (100) to induce combustion between fuel and air; An intech port 102 formed above the combustion chamber 101 to suck a mixer or air into the combustion chamber 101; In the engine composed of the intake valve 103 installed in the in-port port 102 to open and close the in-tech port 102 by the reciprocating motion of the piston 100, the air is introduced into the in-port port 102 in place Direction, the first and second flaps 104a and 104b are pivoted about the shaft 104c and folded, and the first and second flaps 104a and 104b are rotated in the direction in which air in the cylinder flows back. It is constructed by installing a backflow shielding means 104 that extends around 104c to block backflow.

As described above, the present invention configured as described above has the intech port 102 because the intake valve 103 mounted on the intech port 102 is opened in contact with the cam during the suction stroke, that is, when the piston 100 moves downward. A mixer or air is supplied to the combustion chamber 101 formed at the upper portion of the piston 100, wherein the first and second flaps 104a of the backflow shielding means 104 mounted in the intech port 102 are provided. ) 104b is rotated in a clockwise and counterclockwise direction with respect to the shaft 104c by the inflowing air, so that it is folded as shown in FIG. Is supplied.

Subsequently, when the piston 100 moves upward, the air in the cylinder flows back toward the intech port 102 through the intake valve 103. In this case, the first and second flaps of the backflow shielding means 104 are described. 104a and 104b rotate the counterclockwise and clockwise directions about the shaft 104c by the countercurrent air and open the intech port 102 with an angle of 90 degrees, as shown in FIG. This prevents backflow.

As described above, in the present embodiment, when the air flows into the cylinder from the in-tech port, the first and second flaps 104a and 104b of the backflow shield 104 are folded about the shaft 104c to prevent the inflow of air. On the contrary, when the backflow occurs in the cylinder and the air flows toward the intech port, the first and second flaps are unfolded by the backflow air to close the intech port, so that the intake air in the low speed section is not lost. This improves the performance of the engine.

As described above, the present invention installs a backflow shielding means which is folded in a direction in which air is introduced into the intech port and spreads in a direction in which the air flows backward, thereby preventing a backflow when air flows back from the cylinder to the intech port. By blocking the means, it is possible to prevent the deterioration of engine performance due to the backflow of air in the existing low speed section.

The present invention relates to an intake valve backflow prevention of an engine, and more particularly, by installing a flap in an intech port, when an air flow flows into the cylinder from an intech port during an intake stroke, the air flows into the cylinder without interfering with the flow and, on the contrary, the cylinder When the flow occurs from the in-tech port to the intake valve backflow prevention device of the engine to allow the flap to block the flow back to further improve the engine performance.

Claims (1)

The first and second flaps 104a and 104b are rotated about the shaft 104c in the direction in which air flows into the in-port port 102 and the first in the direction in which air in the cylinder flows back. The second flap (104a) (104b) is expanded to the center of the shaft (104c) is installed by installing a backflow shield means for blocking the backflow of the intake valve backflow prevention apparatus of the engine, characterized in that the configuration.