JPH05133234A - Air intake control valve device of internal combustion engine - Google Patents

Abstract

PURPOSE:To generate strong directional swirl when a valve is completely closed and prevent swirl lowering caused by the sticking of carbon without increasing a flow rate when the valve is completely closed. CONSTITUTION:Each cylinder of an internal combustion engine has a valve body 9 provided with two intake ports 3 and 4, and a control valve 7 is secured to the intake port 3 and is opened and closed by an actuator 10. The control valve 7 is provided with an opening 33 which causes local air leakage when the valve is completely closed. A strong directional swirl is generated by the intake air flowing from the opening 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake control valve device provided in an intake system of an internal combustion engine such as a lean burn engine.

[0002]

2. Description of the Related Art Conventionally, a valve body having two intake ports for each cylinder of an internal combustion engine is provided.
There is known an intake control valve device for an internal combustion engine in which a control valve is attached to one of the two intake ports, and the control valve is opened and closed by an actuator (for example, Japanese Utility Model No. 3).
No. 2681). In such an intake control valve device, intake air when the control valve is fully closed (referred to as fully closed valve) is supplied to the inner peripheral surface of the intake port 103 of the valve body 109 and the outside of the control valve 107 as shown in FIG. Clearance 100 between the periphery
Is leaking from. In FIG. 8, FIG. 8A is a sectional view showing the control valve when the valve is fully closed, and FIG. 8B is a front view thereof. Further, the swirl distribution state is shown by a thin line SW in FIG.

[0003]

According to the conventional device, the swirl due to the air leakage of the intake air (called intake air) from the clearance portion 100 when the valve is fully closed is almost equal to the outer peripheral edge of the control valve 107. It is distributed on the circumference. Therefore, the swirl is weak, and therefore the swirl has little directionality,
Effects such as improvement of combustion efficiency cannot be obtained. Further, since the clearance between the control valve 107 and the valve body 109 is set to be small, the clearance 100
The clogging due to carbon adhesion is likely to occur, and the swirl is likely to be further reduced. Further, if the clearance is increased and the opening area of the clearance portion 100 is increased, the durability against clogging of the carbon or the like can be improved. However, in this case, the flow rate of intake air (also referred to as fully closed flow rate) is increased due to air leakage of intake air when the valve is fully closed, so the intake air flow rate (also referred to as intake air flow rate) is reduced and intake efficiency is deteriorated. Such a problem occurs.

Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to generate a strong directional swirl when the valve is fully closed and to increase the flow rate when fully closed. An object of the present invention is to provide an intake control valve device for an internal combustion engine, which can prevent a swirl reduction due to carbon deposition.

[0005]

An intake control valve device for an internal combustion engine according to the present invention which solves the above problems has a valve body having two intake ports for each cylinder of the internal combustion engine. In an intake control valve device for an internal combustion engine in which a control valve is attached to one of the intake ports and the control valve is opened / closed by an actuator, an opening portion that causes local air leakage when the valve is fully closed is used as the control valve. It is provided on the valve or valve body.

[0006]

According to the above means, when the valve is fully closed, the intake air intensively flows out from the opening portion of the control valve or the valve body, and a strong swirl with directionality is generated by the intake air. Further, by forming the opening with an area corresponding to the opening area of the clearance between the conventional valve body and the control valve, for example, the directionality can be improved without increasing the fully closed flow rate as compared with the conventional one. It can generate a strong swirl. Further, since the opening can be set to be larger than the clearance of the clearance portion, clogging due to carbon adhesion is unlikely to occur in the opening.

[0007]

Embodiments of the present invention will be described with reference to the drawings. [Embodiment 1] Embodiment 1 will be described with reference to FIGS. The valve body 9 of this intake control valve device is an engine head of a four-valve engine having two intake ports 203 and 204 and two exhaust ports 5 in each cylinder 2 as shown by a chain double-dashed line in FIG. The above-mentioned fact fair 3-268 between the intake manifold
It is installed in the same manner as the one disclosed in JP-A-1. It should be noted that intake valves 213 and 214 are provided in the intake ports 203 and 204, respectively, and exhaust valves 51 are provided in the exhaust ports 5, respectively.

As shown in FIGS. 1 and 2, the valve body 9 is provided with two intake ports 3 and 4 for each cylinder 2, and one of the intake ports 3 is provided with a control valve 7. It is arranged so that the intake port 3 can be opened and closed. The intake port 3 provided with the control valve 7 is used as a high speed side intake port, and the other intake port 4 not provided with the control valve 7 is used as a low speed side intake port. The valve body 9 has a two-divided structure divided in the center in the longitudinal direction of the engine, and each divided body half 9 is divided into two parts.
It consists of a and 9b interconnected.

An actuator 10 for opening and closing the control valve 7 is arranged at the center of the valve body 9 in the longitudinal direction of the engine. The valve shaft 11 rotated by the actuator 10 extends in the longitudinal direction of the engine, is divided at the central portion of the valve body 9, and is formed as a pair of separate valve shafts 11.
It consists of a and 11b. Of these, the valve shaft 11a
Is provided on the body half 9a, and the valve shaft 11b is provided on the body half 9b. The pair of valve shafts 11a and 11b are provided with intake ports 3 and 4 arranged side by side from the central portion of the valve body 9 toward both ends.
Of these, it extends to the position just before the intake port 4 where the control valve 7 is not provided at both ends.

The valve shaft 11 passes through the intake ports 3 and 4 except for the intake ports 4 at both ends, and the control valve 7 is disposed at a portion of the intake port 3 where the control valve 7 is to be disposed. 7 is attached with screws 16. The portion of the valve shaft 11 that penetrates the intake ports 4 (excluding the intake ports at both ends) where the control valve 7 is not disposed has a smaller diameter than the other portions.

On the other hand, as shown in FIGS.
Actuator 1 arranged in the center of the valve body 9
0 integrally has a bracket 18 extending to the left and right sides along the body halves 9a and 9b on both sides. Then, the bracket 18 is fastened with screws 19 to the body halves 9a, 9a.
By being fixed to b, a pair of body halves 9a, 9b
Are integrated together to form the valve body 9.

The actuator 10 is also connected to the valve shafts 11a and 11b. That is, the rod 21 extends from the actuator 10. The rod 21
Is connected via a pin 23 to a first lever 22 fixed to one valve shaft 11a and rotating integrally with the valve shaft 11a. A second lever 24 is attached to the other valve shaft 11b.
It is attached so that it can rotate together with. The first lever 22 and the second lever 24 can be slightly rotated relative to each other, and the leaf spring 25 attached to the first lever 22 is attached to the pin 2 attached to the second lever 24.
The first lever 22 is connected to each other in such a state that the first lever 22 always urges the second lever 24 to rotate in the direction of closing the control valve 7 by pressing 6. Therefore, the rod 21 of the actuator 10 rotates the first lever 22 to rotate the valve shaft 11a,
The first lever 22 rotates the leaf spring 25, the pin 26, and the second lever 24 to rotate the valve shaft 11b.

Further, the first lever 22 has a fully closed stopper 27 for restricting the fully closed position of the control valve 7.
Is provided. The fully closed stopper 27 contacts the tip of an adjusting screw 28 provided between the body halves 9a and 9b. The adjusting screw 28 can adjust the position where it comes into contact with the fully closed stopper 27, and is provided with a locking spring 29. In FIG. 3, the control valve 7 is fully open.

Intake negative pressure from the intake manifold is introduced to the actuator 10. On the way of the intake negative pressure, a negative pressure tank (not shown), a computer (E
A three-way solenoid valve, which is controlled by the CU) and is also in communication with the atmosphere, is provided. The ECU opens and closes the control valve 7 according to the engine speed by controlling the opening and closing of the solenoid valve according to the operating condition of the engine, such as the engine rotation and the throttle opening. Actuator 1
In addition to the above, 0 is a stepping motor or D
A C motor may be adopted.

Further, as shown in FIG. 4, a circular opening hole 33 is formed in the upstream half of the control valve 7 to cause local air leakage when the valve is fully closed. In FIG. 4, FIG. 4A is a sectional view showing the control valve when the valve is fully closed, and FIG. 4B is a front view thereof.

Next, the operation of the intake control valve device constructed as described above will be described. The control valve 7 arranged in the intake port 3 is controlled to open / close by controlling the operation of the actuator 10 by opening / closing an electromagnetic valve by the ECU. That is,
In a situation where a strong swirl is required for intake air (engine operating state is in the idle to partial range), the ECU opens the electromagnetic valve and the intake negative pressure is introduced into the actuator 10, so that the control valve 7 is in the fully closed state. Become. In this state, the total cross-sectional area of the intake ports 3 and 4 becomes small, the intake flow velocity can be kept high, and good combustion and torque performance in the combustion chamber can be secured.

When the engine operating condition is WOT range,
The control valve 7 is fully opened by closing the solenoid valve by the ECU. In this state, the total cross-sectional area of the intake ports 3 and 4 becomes large, and the intake amount is increased by introducing intake air from both the low speed and high speed intake ports 3 and 4 into the combustion chamber of the engine.
A high output is obtained by reducing the intake resistance by the control valve 7. By controlling the opening and closing of the control valve 7 as described above, the torque performance in the low and medium speed regions is favorably maintained, the output in the high speed region is secured, and the original function of the control valve 7 is achieved.

However, when the control valve 7 is in the fully closed state, the intake air intensively flows out from the opening hole 33 provided in the valve 7, so that a strong swirl with directionality due to the intake air is generated. While being treated, it is introduced into the combustion chamber of the engine. The swirl distribution state at this time is shown by a thin line SW in FIG. 4A (also shown in FIGS. 5 to 7). Further, unlike the conventional device, the outer peripheral edge of the control valve 7 in the fully closed state is brought close to the inner peripheral surface of the intake port 3 of the valve body 9 with almost no clearance.

Further, by forming the opening hole 33 with an area corresponding to the opening area of the clearance between the valve body and the control valve of the conventional device, for example, the fully closed flow rate is increased as compared with the conventional one. It is possible to generate a strong swirl with directionality without causing it. Therefore, the combustion efficiency when the valve is fully closed can be improved. Further, since a strong swirl having the above-described directionality can be generated without increasing the fully closed flow rate as compared with the conventional device, a problem such as deterioration of intake efficiency due to a decrease in intake flow velocity is solved. Further, since the opening hole 33 can be set to be larger than the clearance of the clearance portion of the conventional device, clogging due to carbon adhesion is unlikely to occur in the opening hole 33. Therefore, it is possible to prevent the reduction of the swirl due to the adhesion of carbon.

[Second Embodiment] A second embodiment will be described with reference to FIG. In this example, since the opening hole 33 of the first embodiment is changed, the changed portion will be described in detail, and the first embodiment will be described.
The parts which are considered to be the same as or equivalent to those in FIG. Further, the same concept is applied to the following embodiments, and a duplicate description will be omitted. In this example, two semicircular opening holes 34 are arranged instead of the opening hole 33 of the first embodiment. As described above, the hole shape, the number, and the positions of the opening holes 33 and 34 are appropriately selected according to the requirements of the engine.

[Third Embodiment] A third embodiment will be described with reference to FIG. In this example, instead of the opening hole 33 of the control valve 7, a notch recess 35 is formed in the inner wall surface of the intake port 3 of the valve body 9.

[Fourth Embodiment] A fourth embodiment will be described with reference to FIG. In this example, instead of the notch recess 34 of Example 3, a bypass passage 36 that bypasses the control valve 7 is formed in the wall of the valve body 9 to change the swirl direction. The swirl generation direction, swirl amount, etc., depending on the opening shape, opening area, setting location, etc. of the opening holes 33, 34, the cutout recess 35, and the bypass passage 36 as the opening shown in the first to fourth embodiments Can be easily adjusted.

[0023]

According to the present invention, when the valve is fully closed, the intake air can be intensively discharged from the opening portion of the control valve or the valve body to generate a strong swirl having directionality, which results in combustion efficiency. Is improved. Further, compared to the conventional one, since it is possible to generate a strong swirl with the above-mentioned direction without increasing the fully closed flow rate, it is possible to solve the problem that the intake efficiency is deteriorated due to the decrease of the intake flow velocity and the opening It is possible to prevent carbon from adhering to the surface and prevent the reduction of swirl.

[Brief description of drawings]

FIG. 1 is a front view of an intake control valve device according to a first embodiment.

FIG. 2 is a bottom view of the intake control valve device.

FIG. 3 is a side view of an actuator and its vicinity.

FIG. 4 is an explanatory diagram of a control valve.

FIG. 5 is an explanatory diagram of the second embodiment.

FIG. 6 is an explanatory diagram of the third embodiment.

FIG. 7 is an explanatory diagram of the fourth embodiment.

FIG. 8 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 3, 4 intake port 9 valve body 7 control valve 10 actuator 33 opening hole (opening)

Claims (1)

[Claims] 1. A valve body having two intake ports for each cylinder of an internal combustion engine.
In an intake control valve device for an internal combustion engine, in which a control valve is attached to one of the two intake ports, and the control valve is opened and closed by an actuator, an opening portion that causes local air leakage when the valve is fully closed is provided. An intake control valve device for an internal combustion engine provided in a control valve or a valve body.