JPH07293258A - Swirl controlling valve - Google Patents

Abstract

PURPOSE:To improve an economical efficiency of fuel and the measure against exhaust in a wide range region by generating a proper swirl corresponding to the rotational speed of an engine when a butterfly-shaped controlling valve begins to open. CONSTITUTION:While a main valve plate 7 for opening and closing both sides of a valve shaft 6 is secured fixedly to the valve shaft, an auxiliary valve plate 13 for opening and closing one side is mounted pivotably in a cantilever manner. The auxiliary valve plate 13 is disposed in the upstream of a valve plate part 10 pivoted to the upstream side of an intake path 2 when opened in two valve plate parts 9, 10 for pinching the valve shaft 6 of the main valve plate 7 to be closed to some opening and pass air only through the opening portion at the valve plate part 9 side of the opposite side so that the turbulence caused by the flow of air from both sides and having no unified property is not produced.

Description

Detailed Description of the Invention

[0001]

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

[0002]

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

As is widely known, the means for generating swirl in the combustion chamber of an engine is divided into two branch pipes of the intake manifold, and a control valve installed in each one is opened and closed. One that controls the swirl generated by the air flowing through one side and another that installs a control valve without dividing the branch pipe and generates the swirl by the air passing through the opening part such as the notch of the valve plate In addition, there is one that controls the swirl by opening and closing operation. And, the control valve is generally disclosed in JP-A-54-9.
As represented by the technology described in Japanese Patent Publication No. 9826, it is a butterfly valve that is driven by a diaphragm actuator that operates by negative pressure in the intake manifold.

On the other hand, in recent years, it has been desired to make the fuel economy and the exhaust gas countermeasure more effective by performing the lean air-fuel mixture combustion in a wider range and by performing the exhaust gas recirculation in a larger amount, Therefore, proper and detailed position control of the control valve is required in these areas.

As a countermeasure, the intake manifold negative pressure acting on the diaphragm type actuator is controlled by a solenoid valve which opens and closes by a signal according to the engine operating state,
It has been considered to use a stepping motor as an actuator to open and close the control valve steplessly according to the required air amount of the engine.

However, even if the position controllability of the control valve is improved by the actuator as described above, since the control valve has a butterfly shape, when the valve is opened, the opening portions are formed on both sides of the valve shaft of the valve plate. As a result, it is difficult to properly generate an effective swirl due to non-uniform turbulence in the flow of intake air.

[0007]

The problem to be solved by the present invention is that the control valve installed in each branch pipe of the intake manifold connected to the combustion chamber of the engine to control the swirl has a butterfly shape. Since the openings are formed on both sides of the valve shaft of the valve plate, non-uniform turbulence occurs in the flow of intake air, and the swirl itself is properly generated even if the position controllability is improved by the actuator. It is difficult to do so, and the purpose of improving fuel economy and exhaust emission measures in a wide range cannot be achieved.

[0008]

The present invention has solved the above-mentioned problems and does not cause inconsistent turbulence in the flow of intake air when the valve opening is started, and therefore, it is appropriate for the engine speed. An object of the present invention is to provide a swirl control valve that can generate swirl and can improve fuel economy and exhaust emission control in a wide range.
That is, according to the present invention, a main valve plate that opens and closes both sides sandwiching the valve shaft is fixed to a valve shaft that is arranged across the intake passage of each branch pipe of the intake manifold, and a sub valve plate that opens and closes one side is fixed. A sub-valve plate is installed on the upstream side of the valve plate part that is pivotally mounted and cantilevered and that rotates to the upstream side of the intake passage when the valve is opened among the two valve plate parts that sandwich the valve shaft of the main valve plate. It is configured to be placed. In addition, in this configuration, an opening through which swirl generating air passes may be provided in the valve plate portion that rotates to the downstream side of the intake passage when the valve is opened among the two valve plate portions of the main valve plate.
Further, it is preferable to bias a closing spring that gives a moment in the valve closing direction to the sub valve plate.

[0009]

When the main valve plate starts to rotate in the valve opening direction, openings are formed on both sides of the valve shaft, but the sub-valve plate closes on the upstream side of the valve plate that rotates upstream. Since it is in the valve position, air flows only through the opening formed by the valve plate that rotates to the downstream side, and the swirl can be adjusted according to the engine intake air amount without abruptly reducing or irregularly changing it. Generate swirl. After the main valve plate has opened to the closed position of the auxiliary valve plate, they overlap and rotate integrally in the valve opening direction, forming an opening on both sides of the valve shaft to form an engine in the high-speed rotation range. Secure the required air volume.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described. A valve shaft 6 is arranged across an intake passage 2 of each branch pipe 1 of an intake manifold connected to a combustion chamber of an engine. A branch 6 is rotatably supported by the branch pipe 1, and an actuator that is operated by negative pressure in the intake manifold or by an electric signal according to the engine operating state is connected to the shaft end.

The valve shaft 6 is installed near the outlet end of an adapter 4 which is inserted into the intake manifold and forms a part of the branch pipe 1 of the intake manifold. The adapter 4 is also provided near the outlet end of the fuel injection valve. 3 diagonally.

The intake passage 2 has an elliptical shape having a long diameter in the axial direction of the valve shaft 6 and a short diameter in the direction perpendicular thereto, and a main valve plate 7 of the same shape is fixed to the valve shaft 6 with a set screw 8. The intake passages 2 are opened and closed simultaneously. Further, of the two valve plate portions 9 and 10 sandwiching the valve shaft 6 of the main valve plate 7, the valve plate portion 9 on the mounting hole 3 side has an opening 11 formed by cutting one side away. Is provided, and the air for swirl generation flows through this opening 11.

The main valve plate 7 is opened by rotating counterclockwise in FIG. 1, and the valve plate part 1 having no opening 11 is provided.
An auxiliary valve plate 13 is installed on the upstream side of 0 at an appropriate interval. The sub-valve plate 13 is rotatably and cantilevered on the valve shaft 6 by fitting cylindrical bearing pieces 14 integrally formed at both ends on the valve shaft 6, and the intake passage is sandwiched with the valve shaft 6 interposed therebetween. The area on the opposite side of the mounting hole 3 of 2 is opened and closed.

The auxiliary valve plate 13 rotatably attached to the valve shaft 6 is given a moment in the valve closing direction by the collision of the intake air flow, and the main valve plate 7 is rotated in the valve opening direction to move the valve plate. Part 1
When 0 overlaps, the valve is integrally rotated to open the valve, but when the main valve plate 7 is closed from full opening, the auxiliary valve plate 13 also follows and the closing spring 15 is operated to surely close the valve. .

That is, a window hole 12 is provided in the central portion of the main valve plate 7 so that the valve shaft 6 is exposed, and a coil portion of a closing spring 15 made of a torsion coil spring is provided on the valve shaft 6 at a portion of the window hole 12. The press-fitting portion 15a, which is loosely fitted and held in the intermediate part, is brought into contact with the upstream surface of the valve plate portion 9, and the press-fitting portions 15b at both ends are brought into contact with the upstream surface of the auxiliary valve plate 13. Has been. Further, in order to prevent intake air from passing through the window holes 12 and irregularly disturbing the swirl, the window body 12 is closed on the downstream side surface of the main valve plate 7 and the cover body 16 is overlapped, and the set screw 8 is attached. It is fixed by utilizing.

In this embodiment having such a structure, the valve closing direction of the auxiliary valve plate 13 due to the spring force of the closing spring 15 and the collision of the intake air flow when the engine is rotating when the main valve plate 7 is closed. It is also placed in the closed position by the moment, and the intake air passes only through the opening 11 and creates a swirl in the combustion chamber.

When the main valve plate 7 starts to open, the valve plate portion 10 which rotates toward the upstream side of the intake passage 2 in FIG. 3A in the engine low / medium speed rotation region where the valve opening angle is small. The opening portion 22 is formed apart from the pipe wall, and the auxiliary valve plate 13 arranged further upstream thereof is placed in the valve closing position to open the opening portion 22.
Is blocking. On the other hand, the valve plate portion 9 that rotates toward the downstream side also forms the opening portion 21, but since this opening portion 21 acts to enlarge the opening portion 11 for swirl generation,
At the same time as the flow rate of the intake air is increased, the intake air flows intensively through one side portion of the intake passage 2 and the swirl is generated according to the intake air amount without abruptly reducing the swirl or irregularly varying.

The range from the closed position of the main valve plate 7 to the position where the valve plate portion 10 overlaps the sub valve plate 13 as shown in FIG. 3B is the swirl continuously variable region, and the main valve plate is controlled by the actuator. When 9 rotates in this range, that is, in the low-medium speed rotation range of the engine, the swirl does not cause irregular turbulence as described above. When the main valve plate 7 is further opened, the auxiliary valve plate 13 is integrally opened by being pushed over the valve plate portion 10 and reaches the fully open position shown in FIG. 3 (C). Therefore, the opening portions 2 on both sides sandwiching the valve shaft 6 in a high-speed rotation region above a certain level where swirl is not required
A large amount of air flows from 1 and 22, and the engine required air amount is secured.

When the main valve plate 7 starts to rotate in the valve closing direction from the high opening range, the sub valve plate 13 also integrally rotates in the valve closing direction while overlapping with the valve plate portion 10 by the spring force of the closing spring 15. However, after the sub valve plate 13 reaches the valve closing position, only the main valve plate 7 rotates to the valve closing position. Therefore, when the speed is reduced to the low-medium speed rotation range, the air passes through the opening portion 21 only on the side where the opening portion 11 is provided, and the swirl corresponding to the intake air amount is made again.

In this embodiment, the main valve plate 7 having the opening 11 for swirl formation in each branch pipe and the sub-valve plate 13 for closing one opening portion thereof are installed, but two branch pipes are provided. Even if the main valve plate having no opening for swirl formation and the sub-valve plate for closing the opening part are installed in one of them and the swirl formed by the air flowing through the other is controlled, The purpose of can be achieved.

[0021]

As described above, one of the two opening portions formed when the butterfly-shaped main valve plate for swirl control is opened is closed to a certain opening degree, and the air is opened to the other opening portion. According to the present invention in which only the flow is made to flow, the swirl corresponding to the amount of intake air of the engine is not suddenly reduced or irregularly changed from the closing of the control valve, which is the swirl formation region, to a certain opening. Can be generated. Therefore,
The continuous variable range of the swirl is expanded to a wide range by setting the distance between the main valve plate and the sub valve plate at the valve closing position appropriately to increase the range in which one opening is closed. It is possible to realize improved fuel economy and exhaust emission countermeasures.

[Brief description of drawings]

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

FIG. 2 is a partially cut side view seen from the left of FIG.

FIG. 3 is a schematic side view for explaining the operation.

[Explanation of symbols]

1 branch pipe, 2 intake passage, 6 valve shaft, 7 main valve plate, 9 and 10 valve plate part, 11 opening part, 3 auxiliary valve plate, 15 closing spring,

Claims (3)

[Claims] 1. A sub-valve that opens and closes one side of a main valve plate that opens and closes both sides sandwiching the valve shaft is fixed to a valve shaft that is arranged across the intake passage of each branch pipe of the intake manifold. Of the valve plate part, which is mounted rotatably and in a cantilevered manner, and which rotates to the upstream side of the intake passage when the valve is opened among the two valve plate parts sandwiching the valve shaft of the main valve plate. A swirl control valve, wherein the sub valve plate is arranged on the upstream side. 2. The opening for passing swirl generating air is provided in the valve plate portion of the two valve plate portions of the main valve plate which is rotated to the downstream side of the intake passage when the valve is opened. Swirl control valve. 3. The swirl control valve according to claim 1, wherein a closing spring that gives a moment in a valve closing direction is biased to the sub valve plate.