KR880001726Y1 - Air susction apparatus for fuel direct injection engine - Google Patents

Abstract

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Description

Intake system of fuel injection engine

1 to 5 relates to an embodiment of the present invention,

1 is a cross-sectional top view of the essential part.

2 is a fragmentary view taken along the line (II)-(II) of FIG. 1;

3 and 4 are graphs of engine performance test results.

5 is a partial view corresponding to FIG. 1 of a separate embodiment.

6 and 7 are diagrams corresponding to FIG. 1 according to the prior art.

8 is a view corresponding to FIG. 1 according to another prior art.

* Explanation of symbols for main parts of the drawings

1: combustion chamber 3: intake port

7: With intake 7b: Near end

7c: portion near the start end 7d: straight portion for improving the intake pipe

9: intake pipe

The present invention aims to improve the engine output and reduce the fuel consumption rate by increasing the charging efficiency of the intake system of the fuel injection engine and promoting the vortex generation of the fuel air.

That is, the curved shape of the combustion intake air to the intake is formed in the same turning direction with only the curvature in the same direction, and the combustion air follows the peripheral wall of the combustion chamber in the same turning direction as the above at the inlet. By inhaling into the combustion chamber, the resistance of the combustion air flow in the intake can be reduced to the maximum, the loss of kinetic inertia is minimized, the filling efficiency of the combustion air is increased, and the generation of vortices in the combustion chamber is good. It aims at improving thermal efficiency, engine output, and fuel consumption and fuel consumption.

In a conventional engine, for example, as shown in FIG. 6 and FIG. 7, combustion air is sucked from the intake pipe 9 to the intake air 7 'in the cylinder head 2 and then to the intake air 7'. It swirls in the inlet port 3 part of the end of the inside and is sucked into the combustion chamber 1 in the form of being along the peripheral wall 1a of the combustion chamber 1 to form a vortex S.

Since the intake path 7 'of the combustion air is flanged to the suction pipe 9 on the side face 8 of the cylinder head 2, the angle of intersection between the shaft center of the intake pipe 9 and the side face 8 is alpha. Since it is necessary to increase the size of the cylinder head 2, the cylinder 8 enters as a large angle α from the side surface 8 of the cylinder head 2 and then reverses the curvature in the other direction to return to the inlet port 3 in a spiral shape. It was formed to.

In this case, when the intake path 7 'is formed in a gentle S-shape, since the pressure loss is generated by the resistance of the flow path in the portion where the curvature of the intake path 7' is reversed, the combustion chamber is sucked in the combustion chamber. In (1), the charging efficiency of the combustion air was lowered, and the flow rate of the vortices in the combustion chamber 1 was also lowered, which inevitably reduced the thermal efficiency and output of the engine.

In addition, in the two-valve direct injection type internal combustion engine disclosed in Japanese Patent Application Laid-Open No. 54-171019 as another prior art of the present application separately from FIG. 6 and FIG. In the intake pipe formed inclined with respect to (8), the center line is composed of a straight line matching the angle of inclination and a curve having a simple curvature, and the intake pipes 9 and the cylinder head 2 Although the rectifying grating member 11 which holds the plurality of curved plate members 10 is fitted to the connection portion with the inlet of the inlet, the intake passage 7 'in the cylinder head 2 is not bent and the side ( It is in a state substantially perpendicular to 8), and as a result, the inlet pipe 9 and the cylinder head side face 8 become larger, so that the cylinder head portion cannot be miniaturized. By one plate material 10 Fig falls charging efficiency as well as the fuel is decelerated to be the same resistance weaken the force of the air current due to the mothayeo not generate a strong vortex mixing performance of the fuel will not be also improved.

It is also conceivable to improve the intake pipe 9 of the prior art shown in FIG. 8 to be connected to the intake passage 7 'in the cylinder head of the prior art shown in FIG. 6 or 7.

However, even in the case of the improvement, the effect of the present invention cannot be obtained for the following reason.

In the above-described modified example, since the intake air passage 7 'in the cylinder head 2 has an S-shape, the intake air flows into the intake air in the cylinder head 2 similarly to the conventional example shown in FIG. 7 '), the force of the airflow is weakened by reversing to the S-shape within the shape of the present invention, so that the opposite effect of generating the vortex while increasing the filling efficiency of the present invention can not be expected. In the example, not only a complicated passage shape in which the inlet pipe 9 in the intake pipe 9 is connected to the S-shaped intake path 7 'in the cylinder head 2 but inverted three times is also complicated. ) Is inclined at a large angle of about 20 ° with respect to the side face 8 of the cylinder head 2, and the viewing end is the side face 8 of the cylinder head 2 in the same manner as the conventional art shown in FIG. Sticking out of the distance) It would not be expected that they can be of the reinforced portion and a cylinder head of a small increase of the eddy current and the charging efficiency.

In order to solve the above problems, the present invention forms a curved shape having only the curvature in the same direction, and the combustion air sucked in the intake air is sucked into the combustion chamber from the intake port while maintaining the same turning direction. The above object is achieved by forming an air intake path and an air intake port so as to form a vortex in the same swing direction indoors.

Next, an embodiment of the present invention will be described with reference to the drawings.

An inlet port 3 and an exhaust port 4 are provided in the cylinder head 2 of the combustion chamber 1 of the fuel direct injection engine, and the inlet port 3 and the exhaust port 4 are respectively an intake valve 5 and an exhaust valve ( 6) is opened and closed by.

The inlet port 3 is formed at a position inclined from the center of the upper surface of the combustion chamber 1 to the right side, and the exhaust port 4 is formed at a position inclined to the left side.

In the intake stroke of the engine, the intake passage 7 for sucking the combustion air into the combustion chamber 1 is a helical curved shape whose curvature increases gradually obliquely with respect to the intake opening 3 of the intake opening 3. The oblique rear part close to the right side is formed to be smoothly continuous.

This intake passage (7) is installed through the inlet port (3) through the cylinder head (2) to reach the side face (8) of the cylinder head (2), and outside the cylinder head (2) is flanged to the side face (8). The straight portion 7b which is formed as a connected intake pipe 9 and is smoothly connected to the curved portion 7a of the end portion 7b of the intake path 7 in the intake pipe 9 is connected to the intake pipe 7. 7c is formed in the vicinity of the start end portion 7c.

The straight portion 7d for improving the intake pipe property of the intake pipe 9 is disposed so as to substantially conform to the side surface 8 of the cylinder head 2. The suction air sucked into the intake passage 7 via the intake support pipe is increased by the suction portion pressure in the straight portion 7d having the low resistance, and the curved portion 7a of the intake passage 7 is increased. Flows to the inner end of the intake path (7) while changing the direction of movement continuously and extremely gently in this spiral curved portion (7a), and roughly as a guide action of the spiral peripheral wall of the inner end. It is sucked by the inlet port 3 while turning in a spiral shape close to one rotation, and becomes a vortex S along the peripheral wall 1a of the combustion chamber 1. That is, the cylinder head 2 is inclined so that the suction air enters the combustion chamber 1 from the inlet port 3 and turns to be curved in the same turning direction in the same direction as this. The intake pipe (7) is provided in (2) and is smoothly connected in the same curved direction as the same direction to the intake path (7) provided through the cylinder head (2). It is to form inside.

Next, in the fuel direct injection type engine, an intake apparatus is provided for an engine equipped with the intake apparatus of the present invention (hereinafter abbreviated as engine of the present invention) and an engine equipped with a conventional intake apparatus (hereinafter abbreviated as a conventional engine). Experimental results performed to compare the performances of the following will be described with reference to FIGS. 3 and 4.

(1) the engine provided for the experiment

Fuel direct injection vertical diesel engine

Cylinder diameter X stroke = 116mm * 105mm

(2) Experiment result

3 is a test result showing the load performance test results and the relationship between the engine speed corresponding to each load, the actual average effective pressure (Pme), exhaust temperature (ET), Bosch smoke concentration (Bosch smoke).

The experimental results show that the engine of the present invention is superior to the conventional engine in terms of the performance of the actual average effective pressure, the exhaust temperature, and the Bosch smoke concentration.

In particular, the improvement of the actual average effective pressure by about 4% -8% indicates the corresponding increase in output of the engine shaft. In addition, the improvement in the Bosch smoke concentration indicates that the fuel that was exhausted while not being burned in the conventional engine is more completely burned, contributing to the output of the shaft, and the decrease in exhaust temperature effectively contributes to the output of the shaft of combustion energy. In addition to that, the thermal efficiency of the engine is improved. 4 shows the results of the component performance test, and shows the output of the engine shaft corresponding to the fuel injection at the rated rotational speed 2200 r.pm, the fuel consumption rate (be), the fuel consumption (Be), and the exhaust temperature (ET) of the Bosch smoke concentration. Experimental results showing the relationship.

From the results of this experiment, it can be seen that each of the above-described performances is improved overall, resulting in excellent performance.

In particular, the fuel consumption rate is about 16% or more, but the fuel consumption is significantly reduced.

The improvement of these performances in the engine of the present invention is due to the improvement of the filling effect of the air for combustion by the improvement of the shape of the intake air and the improvement of the combustibility as the promotion of the generation of vortices in the combustion chamber.

As a modification of the above-described embodiment of the present invention, as shown in FIG. 5, the side of the cylinder head 2 with respect to the structure of the portion in which the intake pipe 9 is flanged to the side surface 8 of the cylinder head 2. In (8), the intake pipe connecting projection 2a is provided, and the intake pipe contact surface 2b of the protrusion 2a and the intake path 7 are formed so as to have a large axis center and the crossing angle beta about 60 to 90 degrees. By doing so, it is easy to tighten a screw such as a bolt for fixing the flange connection part of the intake pipe 9.

The present invention has the following effects while being configured as described above. The intake air is formed in a curved state having the same curvature, and the intake air for combustion gradually changes smoothly in the intake air, reaching the end of the inner speed of the intake air, and maintaining the same spiral turning direction. Even after being sucked into the combustion chamber, it becomes a vortex along the surrounding wall of the combustion chamber in the same turning direction, so that the pressure loss of the intake air is extremely small, and the charging efficiency of the intake air is greatly improved.

At the same time, since the flow rate of the vortex of the combustion air in the combustion chamber is increased to become an active vortex, it is easy to mix the combustion air and the injection fuel.

As a result of this, combustion in the combustion chamber is closer to complete combustion, and the output of the engine shaft, the improvement of the thermal efficiency and the fuel consumption rate, the fuel consumption, and the reduction of the black smoke in the exhaust are realized.

In addition, since the inlet pipe is formed with a straight line for improving the intake pipe property, the momentum of the intake air is remarkably increased at the inlet pressure in the straight line with low resistance, and the above-mentioned effect is further enhanced, and the straight line for improving the intake pipe property is improved. Since the part is disposed in a state substantially along the side of the cylinder head, the cylinder head part can be made compact.

Claims (1)

The inlet port 3 is opened at a position inclined to one side from the center of the upper surface of the fuel direct injection type engine combustion chamber 1, and the inlet port 7 is led out from the inlet port and viewed from the cylinder head 2 side so that the intake air is The inlet path is installed through the cylinder head in a curved form in the same direction and in the same turning direction as the flow entering and turning from the inlet to the combustion chamber, and the same direction and the same as that for the inlet path installed through the cylinder head. An intake path is formed in the intake pipe 9 in a curved form that is smoothly continued in the curved direction, and the portion near the beginning end 7c of the intake path formed in the intake pipe is smoothly connected to the curved portion of the end portion 7b. A straight line portion 7d for improving the intake pipe characteristics is formed, and the straight line portion is disposed so as to substantially conform to the side surface 8 of the cylinder head. Direct injection engine air intake device.