JPS63183223A - Intake-passage opening and closing device - Google Patents

Abstract

PURPOSE:To enable the generation of swirl and the suction of air to be performed with a high accuracy by individually controlling, through actuators, control valves which are placed by means of sealed shafts in passages composing one part of each of the intake passages in an engine respectively. CONSTITUTION:The intake manifold of an engine, which is connected to one combustion chamber, is provided with two intake passages. In this case, to each of the intake passages is connected each of the passages 2, 3 for the opening and closing device body 1, and at the same time, to the intake manifold is connected each of the actuators 9, 10 in the same manner. In addition, following the operation of the engine, by introducing the negative pressure within the intake manifold into each of the actuators 9, 10, each of the shafts 6, 7 is caused to make a swinging movement against the force of return springs 13, 14 respectively. Thereby, the No.1 control valve 14 locked onto the No.1 shaft 6 and the No.2 control valve 15 supported by means of a link mechanism 16 on the No.1 shaft 6 are caused to open and close respectively. Hereupon, on the portion of each of the shafts 6, 7 which is exposed to the side of the device proper 1 is placed each of the sealing members 27, 29.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an opening/closing device for an intake passage formed in at least a portion of an intake manifold communicating with a combustion chamber of an engine.

2. Description of the Related Art Conventionally, it has been known to provide an engine with two intake passages for one combustion chamber, for example, in order to generate swirl in the combustion chamber. A system has also been proposed in which one of these two intake passages is constantly communicated with the combustion chamber, and the other is opened and closed by a control valve, thereby making it possible to change the intensity of the swirl according to the load. (For example, see Japanese Patent Laid-Open No. 54-99826).

Problem 1 to be Solved by the Invention: However, in the system in which only one of the two intake passages is opened and closed by a control valve, the purpose is only to generate swirl. This can reach the inlet of the intake system and adversely affect the fuel system of the carburetor.

On the other hand, in order to take advantage of the inertial supercharging effect of the intake air, it is possible to change the effective length of the intake pipe depending on the engine speed, or to close part of the intake passage of the combustion chamber at low loads to perform reduced-cylinder operation. Although known, a single intake passage opening/closing device that satisfies these various demands has not been proposed to date.

Therefore, the present invention provides an intake passage opening/closing device that can satisfy these demands.

Means for Solving the Problems In order to solve the above-mentioned problems, the intake passage opening/closing device according to the present invention has two intake passages formed in at least a part of the intake manifold communicating with the combustion chamber of the engine. a main body provided with a first passage and a second passage constituting a section; a first shaft disposed across the first passage and the second passage and supported by the main body; a second shaft disposed parallel to the first shaft without crossing it; a first control valve fixed to the first shaft to open and close the first passage; and a first control valve rotatably supported by the first shaft. Said number
a second control valve that opens and closes two passages; a first actuator and a second actuator that rotate the first shaft and the second shaft separately; and transmits the rotation of the second shaft to the second control valve. and a link mechanism, and a sealing member is interposed between the portions of the first shaft and the second shaft exposed on the side surface of the main body.

1 - separately controlling first and second control valves disposed in first and second passages formed in at least a portion of an intake manifold communicating with one combustion chamber of the engine by means of first and second actuators; The air intake passage area of the first and second passages is changed by controlling the opening and closing positions to desired opening and closing positions, respectively.

Embodiment The figure shows an embodiment of the present invention for a closed-cylinder engine.The main body 1, which is entirely cast into a substantially elongated rectangular parallelepiped, is connected between a throttle valve for intake control and a combustion chamber of the engine. Each pair of cylindrical first and second passages 2.3 is formed in a straight line according to the position of each intake manifold, and the first and second passages 2.3 are arranged in the middle of the intake manifold installed in the A bulging portion 4 is provided to protrude to one side along the portion where the second passage 3 is formed, and the bulging portion 4 has a cylindrical cavity that opens at the outer end surface and communicates with the second passage 3. 5 are formed respectively.

Further, a first shaft 6 is attached to the main body 1 through the first and second passages 2.
, 3, the second shaft 7 crosses the cavity 5 and the first and second passages 2.
．． 3 and is rotatably arranged parallel to the first axis 6. These first and second shafts 6.degree. 7 are rotated by diaphragm type first and second actuators 8, 9 fixed to the main body 1. Furthermore, 10.
Reference numeral 11 denotes an arm member which is fixed to the first and second shafts 6.7 and connected to the operating rods of the first and second actuators 8.9 to convert linear motion of the actuators into rotational motion and transmit the rotational motion. 12.13 is a return spring.

A first control valve 14 for opening and closing the first passage 2 is fixed to a portion of the first shaft 6 that crosses the inside of the first passage 2, and a first control valve 14 that opens and closes the first passage 2 is fixed to a portion of the first shaft 6 that crosses the inside of the second passage 3. A second control valve 15 that opens and closes the second passage 3 is rotatably supported.

Further, a portion of the second shaft 1 that crosses inside the empty space 5 and the second control valve 15 are connected via link mechanisms 16, and rotation of the second shaft 7 causes the second control valve 15 to closes f7!1. In this embodiment, the link mechanism 1
Reference numeral 6 denotes a fixed member 17 fixed to the second shaft 7, an arm member 18 rotatably supported by the second shaft 7, and this arm member 1.
8 and a support member 20 connected to the second control valve 15, the fixing member 17 has a flat upper receiving portion 21, and the arm member 18 is connected to the upper receiving portion. It has a lower receiving part 22 facing the upper and lower receiving parts 21, and is composed of a spring 23 inserted between the upper and lower receiving parts 21, 22, and an adjusting screw 24 screwed thereon. That is, by turning the adjusting screw 24 to adjust the angle between the fixed member 17 and the arm member 18, the opening position of the second control valve 15 can be adjusted, or the opening position can be adjusted due to variations in each link mechanism 16. It is possible to adjust the alignment etc., but basically it is sufficient if the second m+1tXI valve 15 can be opened and closed by the rotation of the second shaft 7,
Linkage mechanism 16 may have other configurations.

Note that 25 is a lid that covers the outer opening of the cavity 5, and this lid 25 is airtightly fixed with a sealing member such as an O-ring or a gasket interposed therebetween.

Further, one end of the shaft hole into which the first shaft 6 is fitted is hermetically sealed with a blind plug 26, and the other end to which the arm member 12 is connected is hermetically sealed with a sealing member 27 such as an O-ring. ing. Furthermore, both ends of the shaft hole into which the second shaft 7 is fitted are hermetically sealed by blind plugs 28, and the portion passing through the bulge 4 is hermetically sealed by a sealing member 29. This prevents atmospheric air from being sucked in through the gaps between the first shaft 6, the second shaft 7, and their shaft holes.

In this embodiment, which is configured in this way, the intake manifold communicating with one combustion chamber of the engine has two intake passages, and the first passage 2 and the second passage 3 are respectively connected to the corresponding intake passages. and the first and second actuators 8.9 are connected to the intake manifold, respectively, so that negative pressure in the intake manifold is introduced into the first and second actuators 8.9 by engine operation. the first and second axes 6.
7 is a first control valve 14 which rotates against the urging force of return springs 12 and 13 and is fixed to the first shaft 6, and a second control valve which is supported by the first shaft 6 via a link mechanism 16. 15 open and close, respectively. Therefore, the set positions of the first control valve 14 and the second control valve 15, the areas of the diaphragms of the first and second actuators 8.9, the biasing force of the return springs, etc. are adjusted according to the load of the engine. 1st - control valve contact and 2nd control! 7. By predetermining the desired opening and closing states of the control valves, for example, the first control valve 1
Of course, the intensity of the generated swirl can be varied steplessly by controlling the opening degree of the second control valve 15 with the valve 4 always open. Of course, a wider range of swirl intensity can be obtained by controlling the first control valve stem. Further, both the first and second control valves 14, 15 are half-opened to prevent the pulsating pressure of the engine at low speeds from blowing back into the intake system inlet, thereby preventing an adverse effect on the fuel system of the carburetor. Furthermore,
It is possible to steplessly control the intake passage area according to the rotational speed of the engine so as to make maximum use of the inertial supercharging effect of intake air, and the intake efficiency can be extremely effectively increased. Furthermore, if each of the first and second passages 2.3 arranged corresponding to the combustion chamber of the engine is connected to the combustion chamber, for example, the two first passages and the second passage are respectively connected to the combustion chamber, so that the engine can be operated under low load. It is possible to perform cylinder reduction operation by opening the intake passage of a part of the combustion chamber.

In particular, in this embodiment, a first control valve 1 for opening and closing the first passage 2 is mounted on a first shaft 6 disposed across the first passage 2 and the second passage 3.
A second control valve 15 for opening and closing the second passage 3 is rotatably supported, and the second control valve 15 is attached to the first shaft 6 without crossing the first passage 2 and the second passage 3. Since the structure is such that the second shaft 7 arranged in parallel with the second shaft 7 is connected by the link mechanism 16, the lengths of the first passage 2 and the second passage 3 can be shortened, which is economical and requires less mounting space. It's over.

Furthermore, in this embodiment, the first and second actuators 8.9 are of a diaphragm type and are connected to the intake manifold, respectively, and are actuated by the negative pressure inside the intake manifold generated by engine operation. The diaphragm may be driven by negative pressure at another location or by a separately provided negative pressure generator, and step motors, for example, may be used as the first and second actuators 8.9, and these step motors may be controlled by a computer. Other configurations may also be used.

Further, in this embodiment, the intake passage opening/closing device is configured separately from the intake manifold, but it is configured as a part of each of two intake passages formed in at least a portion of the intake manifold communicating with one combustion chamber of the engine. If the first passage and the second passage exist, they may be formed integrally with the intake manifold.

Effects of the Invention Since the present invention is configured as described above, the first and second control valves are individually controlled by the first and second actuators to control at least one of the intake manifolds communicating with one combustion chamber of the engine. The first and second passages formed in a part can be opened and closed as desired, and swirls with a wide range of strengths can be effectively and steplessly generated. It is possible to effectively generate swirl while preventing the intake air from reaching the intake system inlet through the passage, and also to maximize the inertial supercharging effect of the intake air depending on the engine rotational speed. It is possible to steplessly control the passage area to extremely effectively increase intake efficiency, and even close part of the intake passage of the combustion chamber at low loads to perform reduced-cylinder operation with a single device. It can be done easily.

Furthermore, the sealing member prevents atmospheric air from being sucked in through the gaps between the shaft hole formed in the main body and the first and second shafts, making it possible to set an accurate air-fuel ratio, which is advantageous in terms of exhaust gas countermeasures. The controllability of idle speed, which is easily affected by air intake, is improved, and the set idle speed does not become unstable.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway side view, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. Sectional view taken along line B-B in the figure, No. 4
The figure is a perspective view showing the link mechanism. 2...First passage, 3...Second passage, 6...First axis, 7...Second axis, 8...First actuator, 9
...Second actuator, 14...First control valve, 1
5... Second control valve, 16... Link mechanism, 27, 2
9... Seal member.゛、

Claims (1)

[Scope of Claims] A main body provided with a first passage and a second passage each forming a part of two intake passages formed in at least a part of an intake manifold communicating with a combustion chamber of an engine; a first shaft disposed across the first passage and the second passage and supported by the main body; and a second shaft disposed parallel to the first axis without crossing the first passage and the second passage; a first control valve fixed to the first shaft to open and close the first passage; and a second control valve rotatably supported to the first shaft to open and close the second passage; a first actuator and a second actuator that rotate the shafts separately; and a link mechanism that transmits the rotation of the second shaft to the second control valve, and the main body of the first shaft and the second shaft. An intake passage opening/closing device characterized in that a sealing member is interposed in a portion exposed on a side surface.