JPH084538A - Swirl control valve - Google Patents

Abstract

PURPOSE:To increase a swirl controllable range and to ensure a demand air amount without increasing intake resistance during full opening. CONSTITUTION:The size of a valve plate part 5 on the side wherein an opening part 7 for generating a swirl is not formed with the valve stem 1 of a plate-form valve plate 2 nipped therebetween is increased to a value higher than that of the half section part 14 of an inlet pipe 11 and a dent 16 wherein the outer peripheral edge 6 of the valve plate 5 is rotated in such a state to make approximately contact with a bottom 18 throughout a range of from full closing to some opening is formed in the wall surface 12 of the inlet pipe 11. At a full closing area and a small opening area, air flows through only the side of the opening part 7 and at a full opening area, the valve plate-form valve plate 2 is prevented from increasing intake resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is installed in an intake pipe of an engine and is closed in a low / medium speed range to generate swirl in a combustion chamber. It relates to a swirl control valve that works to ensure that.

[0002]

2. Description of the Related Art Combustion of a lean air-fuel mixture in an automobile engine is one of the effective means for fuel economy and exhaust emission control, and swirl is provided in the combustion chamber in the low / medium speed rotation range where the intake air amount is small. It is a well-known technique that it is possible to burn a lean air-fuel mixture without causing misfire by producing it, and for that reason, it is possible to significantly increase the amount of exhaust gas recirculation and improve fuel economy. .

As one of the means for generating swirl, a butterfly-shaped control valve having an opening such as a cutout provided on a valve plate is installed on each branch pipe of the intake manifold, and air passing through the opening is closed when the valve is closed. There are some that use. Further, as one of the means for controlling the control valve, as described in Japanese Patent Laid-Open No. 54-99826, there is a diaphragm which is controlled by a negative pressure of the intake manifold to perform two-position control of fully closed and fully opened. Yes,
This diaphragm type actuator is widely adopted because it has a simple structure and can be provided at a low price.

On the other hand, there are two types of valve plates, one having a flat plate as a whole and one having a valve shaft sandwiching the valve shaft formed thicker than the other valve plate having an opening. .

A control valve using a valve plate having a generally flat plate is provided on both sides of a valve plate 52 with a valve shaft 51 sandwiched between them as shown in (1) of FIG. The outer peripheral edge 53,
54 also separates from the wall surface 57 of the intake pipe 56 that is a branch pipe at the same time, and air also flows from the side where the opening 55 is not provided and the swirl is drastically reduced, enabling swirl control for the intake air amount. Very narrow range,
There is a problem.

The one in which one valve plate portion sandwiching the valve shaft is made thick is developed in order to solve the above-mentioned problems of the valve plate having a flat plate shape as a whole. When the valve opening is started, the outer peripheral edge 63 on the side having the opening 65 is separated from the wall surface 57 of the intake pipe 56 as shown in (2) of FIG. The outer peripheral edge 64 of the valve plate portion thus maintained maintains a state of being substantially in contact with the wall surface 57 up to a certain opening degree, and the swirl controllable range can be expanded.

However, if the wall thickness of the valve plate portion on the thick wall side is increased in order to perform swirl control over a wide range of low / medium speed rotation regions, the central portion of the branch pipe 56 is largely closed at the time of full opening and the intake resistance is increased. Is significantly increased, which causes a decrease in engine output in a high load operation range.

[0008]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is that the swirl controllable range is extremely narrow in the case where the whole valve plate is made of a flat valve plate. This is because a valve plate with a valve plate causes a decrease in engine output when fully opened, has a wide swirl controllable range, and does not have a butterfly-shaped swirl control valve that can secure the required air amount at full opening.

[0009]

SUMMARY OF THE INVENTION The present invention solves the above problems and is a swirl control valve which is composed of a flat plate-like valve plate which can secure a required air amount when fully opened and which can obtain a wide swirl controllable range. It is intended to provide.

That is, in order to achieve such an object,
According to the present invention, the valve plate portion on the side where the opening is not provided across the valve shaft is formed to be larger than the half cross-sectional portion of the intake pipe, and the outer peripheral edge of the valve plate portion extends from the fully closed position to the half cross-sectional portion. The indentation is formed on the wall surface of the intake pipe so as to rotate almost in contact with the bottom.

It should be noted that the recess should have a triangular cross-section that gradually becomes shallower from the fully closed position of the valve plate portion toward the upstream side of the intake pipe in the valve opening direction, or from the valve plate portion at the fully closed position upstream of the intake pipe and It is preferable to have a crescent-shaped cross section that gradually becomes shallower toward the downstream side. Alternatively, in addition to the triangular recess, it is preferable to expand the intake pipe in the downstream side portion by the maximum depth of the recess.

[0012]

When the air valve is fully closed, the air passes around the valve plate with the opening as the main passage to generate swirl in the combustion chamber. When the valve opening is started, the valve plate portion having the opening immediately separates from the wall surface of the intake passage to increase the intake air amount, but the other valve plate portion is almost in contact with the bottom of the recess. Therefore, the state that the intake air does not separate from the wall surface is maintained until a certain degree of opening, and the intake air flows unevenly toward the opening side to generate a swirl according to the intake air amount without sharply reducing the swirl. The intake air resistance is small and the required air volume is secured because the whole is flat when fully opened.

When the recess has a triangular cross section, the wall at the downstream end thereof functions as a fully closed stopper for the valve plate. When the recess has a crescent-shaped cross section or the downstream side portion of the intake pipe is enlarged, the air flow passing through the gap becomes smooth when the valve is opened.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to the drawings. The valve plate 2 is a thin flat plate having a substantially oval shape.
It is attached to the valve shaft 1 on the center line in the major axis direction, and one of the two valve plate portions 3 and 5 sandwiching the valve shaft 1 has an opening 7 formed on one side by a notch. are doing.

The intake pipe 11 also has an oval cross section, and its inner diameter in the major axis direction is substantially equal to the major axis of the valve plate 2, but its inner diameter in the minor axis direction is smaller than the minor axis of the valve plate 2.

The valve shaft 1 is arranged in the intake pipe 11 so as to be deviated from the center line in the major axis direction thereof, and the outer peripheral edge 4 of the valve plate portion 3 having the opening 7 is substantially inscribed in the wall surface 12 of the intake pipe 11. Moreover, the valve plate portion 3 opens and closes one half cross-section portion 13 which is divided by a surface of the intake pipe 11 which passes through the valve shaft 1.

Further, by virtue of the above-mentioned arrangement, the other valve plate portion 5 of the valve plate 2 has a shape larger than the other half-section portion 14 of the intake pipe 11, and the portion which is embedded in the intake pipe 11. A dimple is formed.

In the embodiment shown in FIGS. 1, 2 and 3, the recess 16 has a triangular cross section which gradually becomes shallower from the fully closed position of the valve plate portion 5 toward the upstream side of the intake pipe 11 in the valve opening direction. The wall 17 at the downstream end serves as a full-open stopper of the valve plate 2, and the bottom 18 of the recess 16 is curved so that the valve plate portion 5 rotates so that the valve plate portion 5 substantially contacts the outer peripheral edge 6. .

In this embodiment having such a structure, when the valve plate 2 is fully closed, air passes around the valve plate 2 with the opening 7 as a main passage to generate swirl in the combustion chamber.

When the valve opening is started, the outer peripheral edge 4 of the valve plate portion 3 on the side having the opening 7 is separated from the wall surface 12 as shown in FIG. But the other valve plate portion 5 has a recess 16 at the outer peripheral edge 6.
The valve stays in close contact with the bottom 18 of the valve so that the air concentrates in the half-section portion 13 on the side of the opening 7 and generates a swirl according to the intake air amount without sharply reducing the swirl. Will be done.

When rotated from the fully closed position by an angle θ or more, as shown in FIG.
As shown in (2) of FIG.
6 escapes from the wall surface 6 and separates from the wall surface 12, air freely flows through this gap, the intake air amount further increases, and the swirl decreases and disappears.

FIG. 3 (3) shows the fully open state, and since the valve plate 2 is a thin flat plate as a whole, the intake resistance is small,
It is possible to secure the required air amount in the high load operation range of the engine.

In the embodiment shown in FIG. 4, the recess 20 has a crescent-shaped cross section which gradually becomes shallower from the fully closed position of the valve plate 5 toward both the upstream side and the downstream side of the intake pipe 11, In particular, the bottom 21 in the upstream direction, which is the valve opening direction of the valve plate portion 5, is formed in a curved shape so that the outer peripheral edge 6 makes contact with and rotates.

In the embodiment shown in FIG. 5, the recess 23 has a triangular cross section which gradually becomes shallower from the fully closed position of the valve plate portion 5 toward the upstream side of the intake pipe 11 in the valve opening direction.
The bottom 24 has a curved shape so that the outer peripheral edge 6 is almost in contact with the bottom 24, and the intake pipe 11 is expanded by the maximum depth of the recess 23 in the downstream portion of the recess 23 to expand the half-section portion 14. It is a thing.

According to these embodiments, the depressions 20, 2
The bottoms 21 and 24 of the valve 3 have an outer peripheral edge 6 of the valve plate portion 5 up to a certain opening.
To maintain the valve closed state almost in contact with
Same as the embodiment of FIG. 3, but when the air escapes from the depressions 20 and 23 and the air flows, the air passing through the gap along the wall surface 12 smoothly flows without changing the direction, Air can be supplied to the engine according to the rotation angle, that is, the opening degree.

It is to be noted that the valve shaft 1 may be arranged on the center line of the intake pipe 11 in the major axis direction and may be formed larger than the valve plate portion 3 having the valve plate portion 5 having no opening 7. Of course there is.

[0027]

As is apparent from the above, the valve plate portion of the flat valve plate on the side not having the swirl generating opening is rotated from the fully closed state to a certain opening degree in the recess to close the valve. According to the present invention, the valve plate is placed at the fully closed position and the small opening position, the air flows only on the opening side in the low / medium speed rotation range, and the swirl is rapidly increased at the same time when the valve opening is started. The inconvenience of reduction is eliminated and the swirl controllable range is widened. Further, since the intake resistance is not unnecessarily increased when fully opened, the required air amount in the high load operation range is secured and the output is not reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is an operation explanatory diagram of the embodiment of FIG.

FIG. 4 is a vertical sectional view showing another embodiment of the present invention.

FIG. 5 is a vertical sectional view showing still another embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing a conventional product.

[Explanation of symbols]

1 valve shaft, 2 valve plate, 3,5 valve plate part, 4,6 outer peripheral edge, 7 opening part, 11 intake pipe, 12 wall surface, 13, 14
Half section, 16, 20, 23 depressions, 18, 2
1, 24 bottom,

Claims (4)

[Claims] 1. A swirl control valve in which a valve plate has a flat plate shape, an opening is provided in one valve plate portion sandwiching a valve shaft attached to a central portion thereof, and the intake pipe is openably and closably installed.
The other valve plate portion of the valve plate is formed to be larger than the half cross-section portion of the intake pipe, and the outer peripheral edge of the other valve plate portion is substantially in contact with the bottom from the fully closed position to the half cross section portion. A swirl control valve, characterized in that a recess for rotating the intake pipe is provided on a wall surface of the intake pipe. 2. The swirl control valve according to claim 1, wherein the recess has a triangular cross section which gradually becomes shallower from the fully closed position of the valve plate portion toward the upstream side of the intake pipe in the valve opening direction. 3. The swirl control valve according to claim 1, wherein the recess has a crescent-shaped cross section that becomes shallower from the valve plate portion in the fully closed position toward the upstream side and the downstream side of the intake pipe, respectively. 4. The depression has a triangular cross-section that gradually becomes shallower from the fully closed position of the valve plate portion toward the upstream side of the intake pipe in the valve opening direction, and the portion of the intake pipe on the downstream side of the depression is the maximum of the depression. The swirl control valve according to claim 1, wherein the swirl control valve is expanded by a depth.