JP2001303960A - Variable intake device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable intake device for an internal combustion engine with improved power by preventing the air flow from disturbing when opening a variable intake valve. SOLUTION: This variable intake device for the internal combustion engine is provided with respective intake pipes 12 and a surge tank 15 partitioned by a partition 18 and integrated together, and varies the intake pipe length by opening/closing respective communication ports 19 provided in the partition 18 for every intake pipe 12 by the respective variable intake valves 20. This intake device is characterized in that the rotary shafts 22 and 23 of the respective intake valves 20 are arranged along the central axes of the respective intake pipes 12. When the respective intake valves 20 are opened, the respective variable intake valves 20 take attitude along the air flow so that, when the respective variable intake valves 20 are opened in a high rotation speed range of the engine, the respective intake valves 20 are prevented from disturbing the air flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which each intake pipe and surge tank are separated by a partition and integrated, and each communication port provided in the partition for each intake pipe is opened and closed by each variable intake valve. The present invention relates to a variable intake device for an internal combustion engine that makes the intake pipe length variable.

[0002]

2. Description of the Related Art Conventionally, as a variable intake device for an internal combustion engine of this type, for example, a device described in Japanese Patent Application Laid-Open No. 7-102797 has been known. In this prior art, each intake pipe and surge tank are separated by a partition and integrated, and each communication pipe provided in the partition is opened and closed by each variable intake valve for each intake pipe, thereby making the intake pipe length variable. It is supposed to.

[0003]

However, in the above prior art, when each of the variable intake valves provided for each intake pipe is opened in a high engine speed range, the valves obstruct the flow of air flowing through each intake pipe. As a result, there is a problem that the cost of improving the power performance is reduced.

The present invention has been made in view of such a conventional problem, and an object thereof is to improve the power performance by not obstructing the air flow when the variable intake valve is opened. An object of the present invention is to provide a variable intake device for an internal combustion engine.

[0005]

The means for solving the above-mentioned problems and the effects thereof will be described below. Claim 1
According to the invention according to the invention, each intake pipe and the surge tank are partitioned by a partition and integrated, and each communication port provided in the partition for each intake pipe is opened and closed by each variable intake valve,
In a variable intake device for an internal combustion engine in which an intake pipe length is variable, a rotation axis of each of the variable intake valves is set in a direction along a central axis of each of the intake pipes.

According to this configuration, the rotation axis of each variable intake valve is oriented in the direction along the central axis of each intake pipe.
When each variable intake valve is opened, each variable intake valve takes a posture along the flow of air in each intake pipe. Therefore, when each variable intake valve is opened in a high engine speed range, each variable intake valve does not hinder the flow of air, and the power performance can be improved.

According to a second aspect of the present invention, the rotary shaft of each of the variable intake valves is independently rotatably supported by a valve support member provided in the surge tank.

According to this configuration, since each variable intake valve is independently rotatably supported by the valve support member, the length of the rotation shaft of each variable intake valve is reduced. For this reason, even if the accuracy of each variable intake valve and the valve support member is somewhat poor, the reliability of operation of each variable intake valve, that is, the reliability of opening and closing, is improved. Accordingly, even if a low-cost fixing method in which each variable intake valve is sandwiched by the valve support member with respect to the partition wall is employed, sufficient reliability of operation of each variable intake valve can be obtained. Can be reduced.

According to a third aspect of the present invention, an eccentric shaft eccentric to the rotary shaft is provided integrally with the rotary shaft of each of the variable intake valves, and an end of each eccentric shaft is connected to the rotary shaft. A plurality of bearing portions of the connecting member driven in a direction intersecting with the axis of the shaft are supported so that displacement of the connecting member is transmitted to each eccentric shaft.

According to this structure, by driving the connecting member in a direction intersecting with the axis of the rotating shaft, the eccentric shafts of the respective variable intake valves respectively supported by the plurality of bearing portions of the connecting member are connected to the connecting member. It is displaced in the same direction, and this displacement causes each of the variable intake valves to rotate about a rotation axis to open and close. Thereby, each independent variable intake valve can be opened and closed by driving one connecting member.

According to a fourth aspect of the present invention, the plurality of bearing portions of the connecting member are independently provided integrally with a bearing fixing portion which is elastically deformable in a direction intersecting the axis of the rotating shaft. It is characterized by the following.

According to this configuration, when the relative positional accuracy of the eccentric shaft of each variable intake valve is poor, the communication port of some intake pipes cannot be completely closed by the variable intake valve. Can be prevented. That is, in order to move the plurality of variable intake valves by one drive mechanism, for example, a diaphragm, the eccentric shaft of each variable intake valve is supported by each of the plurality of bearings of one connecting member. With this configuration, even when the relative positional accuracy of each eccentric shaft is poor, each bearing portion supporting each eccentric shaft is displaced in accordance with the variation in the accuracy due to elastic deformation of a bearing fixing portion provided integrally therewith. As a result, variations in the relative position accuracy of each eccentric shaft are absorbed, and the relative position of each eccentric shaft is automatically adjusted to a normal position. Therefore, even if the positional accuracy of the variable intake valves in each intake pipe is somewhat poor, the communication ports of all the intake pipes can be completely closed by the variable intake valves.

According to a fifth aspect of the present invention, in the vicinity of the plurality of bearing portions of the connecting member, displacement limiting portions for limiting displacement of the bearing portions in a direction intersecting with the axis of the rotating shaft are provided. It is characterized by having been done.

According to this configuration, the displacement amount of each bearing portion can be regulated by each displacement limiting portion so that each bearing portion of the connecting member is not excessively displaced in the direction. The invention according to claim 6 is characterized in that a first chamber whose introduction pressure is controlled and a second chamber communicating with the surge tank are provided on a surge tank wall of an intake manifold in which each of the intake pipes and the surge tank are integrated. The diaphragm partitioned by is integrated, the end is fixed to the movable membrane, the connecting member is connected to the operating shaft projecting into the surge tank, and further, the operating shaft is pushed in the surge tank. The movable film is biased by a spring.

According to this configuration, in order to drive the connecting member in the surge tank by the diaphragm as a drive mechanism disposed outside the surge tank, a seal mechanism is provided between the operating shaft and the surge tank wall of the intake manifold. There is no need to provide Thereby, cost reduction can be achieved.
Further, in this configuration, as a condition for lowering the pressure introduced into the first chamber of the diaphragm to open each variable intake valve, in addition to the engine speed, the throttle valve opening or the pressure in the surge tank is applied. For example, when the engine speed is high, the throttle valve opening is large, and the pressure inside the surge tank is high, the pressure introduced into the first chamber is controlled to be reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a variable intake device for an internal combustion engine embodying the present invention will be described below with reference to FIGS.

FIG. 1 shows an intake manifold of a V-type eight-cylinder internal combustion engine provided with a variable intake device according to the present embodiment. The intake manifold 11 has eight intake pipes 12 connected to respective intake ports of left and right cylinder heads (not shown) provided at an upper portion of a cylinder block. In each intake pipe 12, a left cylinder head and a right cylinder head are alternately arranged in a line.

As shown in FIG. 2, the intake manifold 11 is made by integrating a lower manifold 13 and an upper manifold 14 which are divided into two parts, and has a surge tank 15 inside (see FIG. 1). The lower manifold 13 is provided with a head mounting flange 16 which is mounted on the left and right cylinder heads, and a throttle body mounting flange 17 on which the throttle body is mounted. Further, a variable intake device is provided on the upper manifold 14 side.

As shown in FIGS. 1 to 3, the variable intake device is integrated such that each intake pipe 12 and surge tank 15 are separated by a partition 18. A communication port 19 is provided for each 12. Each communication port 19 is arranged in a line in the direction in which the intake pipes 12 are arranged.
It is provided on the partition 18. In this variable intake device, each communication port 19 is opened and closed by a variable intake valve 20, so that the intake pipe length of each intake pipe 12 is made variable (switched between two modes). Each communication port 19 and each variable intake valve 20 have the same number (eight) as the intake pipes 12, respectively.
Is provided. Each communication port 19 is a rectangular opening. Each of the variable intake valves 20 is connected to each of the communication ports 1 when closed.
9 is a butterfly valve having a valve body 21 shaped and sized to completely close the intake pipe 12 and block communication between each intake pipe 12 and the surge tank 15.

In this variable intake device, the rotary shafts 22 and 23 of each variable intake valve 20 are oriented along the central axis of each intake pipe 12 (see FIGS. 1 and 3). That is, each of the variable intake valves 20 is configured such that the rotating shafts 22 and 23 protruding from both ends of the valve body 21 extend in a direction along the central axis of a portion of the intake pipe 12 where the communication port 19 exists. Is provided.

The rotary shaft 2 of each variable intake valve 20
The two and 23 are independently rotatably supported by eight valve housings (valve support members) 24 provided in the surge tank 15 (see FIGS. 2 and 3). As shown in FIG. 3, each valve housing 24 has a peripheral wall 25 that forms an opening having a size that does not collide with the valve body 21 of each variable intake valve 20. U-shaped cutouts 26, 26 each having an open top are formed in opposing walls of the peripheral wall 25. The lower ends of the notches 26, 26
Bearing portions 27, 27 that rotatably support the rotating shafts 22, 23, respectively. Each of the valve housings 24 is provided with a rotating shaft 2 of the corresponding variable intake valve 20.
The variable intake valves 20 are joined to the lower surface of the partition 18 such that each of the variable intake valves 20 is sandwiched between the partition 18 and the bearings 27 in a state where they are engaged with the bearings 27. As the joining method, for example, there are methods such as adhesion by an adhesive, welding by frictional heating by vibration, welding by heating by ultrasonic vibration, and welding by heating by laser beam irradiation.

As shown in FIGS. 3 and 5, the rotary shafts 22 and 23 of the respective variable intake valves 20 are provided with respective valve housings 24 in a state of being engaged with the bearings 27 and 27.
Locking portions 28, 28 contacting the outer surfaces of the opposed wall portions of
Are formed. The contact prevents each variable intake valve 20 from rattling in the axial direction of the rotating shafts 22 and 23. In addition, each variable intake valve 2
0, one of the rotating shafts 23,
An eccentric shaft 29 is provided which is eccentric with respect to. That is, the axis O2 of the eccentric shaft 29 is eccentric with respect to the axis O1 of the rotating shafts 22 and 23 by a predetermined eccentric amount d (FIG. 5, FIG. 5).
FIG. 9A). Eccentric shaft 29 of each variable intake valve 20
Is formed with a small-diameter shaft portion 30 and a locking claw 31 formed on the distal end side of the shaft portion 30, and a slit 32 is provided to enable elastic deformation. . The ends of the eccentric shaft 29 of each variable intake valve 20 are connected to a plurality of bearing portions 36 of a connecting member 35 (see FIG. 4) driven in a direction intersecting the axes of the rotating shafts 22 and 23.
The connecting members 35 are supported so that the displacement of the connecting members 35 is transmitted to the respective eccentric shafts 29. The direction intersecting with the axis is, for example, a direction substantially orthogonal to the axis in a horizontal plane including the axis of the rotating shafts 22 and 23.

As shown in FIGS. 2 and 4, the connecting member 35 is an elongated rectangular member, and is made of a material having an appropriate elastic modulus and being resistant to repeated deformation. The connecting member 35 is provided with eight bearings 36 that support the end of the eccentric shaft 29 of each variable intake valve 20. The dimensions between the bearings 36 are the same as the dimensions between the variable intake valves 20. Further, each bearing portion 36 has a short diameter portion having a size to which the small diameter shaft portion 30 of the eccentric shaft 29 fits,
The small-diameter shaft portion 30 has a vertically-long elliptical shape including a long-diameter portion having a size that allows a predetermined amount of displacement in the vertical direction. A part of the upper portion of the bearing portion 36 is
6 has been cut away to allow it to elastically deform.
When the ends of the eccentric shafts 29 are supported by the bearings 36, the locking claws 31 are prevented from falling off at the end surfaces of the bearings 36 and locked as shown in FIG. .
That is, while the end of each eccentric shaft 29 and each bearing portion 36 are elastically deformed, each small-diameter shaft portion 30 is engaged with each bearing portion 36 (so-called snap-fit).

The plurality of bearings 36 of the connecting member 35
Are independently and integrally provided with a bearing fixing portion 37 which is elastically deformable in a direction intersecting the axis. In the vicinity of both sides of each bearing portion 36, a displacement limiting rib (displacement limiting portion) 38 for limiting the displacement of each bearing portion 36 in a direction intersecting with the axis is provided. Accordingly, the amount of displacement of each bearing portion 36 in the direction intersecting with the axis is restricted.
Further, a reinforcing rib 39 is provided at an intermediate portion between the two adjacent bearing portions 36, 36, and a thin wall portion between each bearing portion 36 and the reinforcing rib 39 is lightened to reduce the weight. Is provided. Further, a connecting portion 41 is formed at one end of the connecting member 35.

The surge tank wall 45 of the intake manifold 11 communicates with a first chamber 46 into which a low pressure is introduced, as shown in FIGS. A diaphragm 50 in which the second chamber 47 is partitioned by a rubber film (movable film) 48 is integrated. This integration is performed by the inclined portion 5 of one case of the diaphragm 50.
1 is fitted to the mounting hole 52 formed in the surge tank wall 45, and the inclined portion 51 and the surge tank wall 45 are joined by the various methods described above.

One end of an operating shaft 55 projecting into the surge tank 15 is fixed to the rubber film 48 of the diaphragm 50. The other end of the operating shaft 55 is connected to the connecting portion 41 of the connecting member 35 by fastening with a bolt and a nut. The rubber film 48 is urged by a spring 56 in a direction to push the operation shaft 55 into the surge tank 15. The diaphragm 50 reduces the pressure introduced into the first chamber 46 when the throttle valve opening is equal to or more than a predetermined value and the air pressure in the surge tank 15 is equal to or more than a predetermined value. The pressure difference of 47 overcomes the urging force of the spring 56, and the rubber film 48 and the operating shaft 55 are displaced to the operating position shown in FIG. When this displacement is transmitted to the eccentric shaft 29 of each variable intake valve 20 via each bearing portion 36 of the connecting member 35, each variable intake valve 20 rotates from the closed position and switches to the open position. .

FIG. 8 shows the configuration of a control device for controlling the pressure introduced into the first chamber 46 of the diaphragm 50. This control device is a vacuum tank 60
, A vacuum switch valve 61 and an ECU 62. The vacuum tank 60 has an input port 63 and an output port 64, and the pressure in the surge tank 15 is supplied to the input port 63 via the check valve 67, and the pressure is stored. For example, when an operation signal (ON signal) is output from the ECU 62 and the vacuum switch valve 61 is energized, both ports 6
5 and 66 communicate with each other to supply a low pressure from the vacuum tank 60 to the first chamber 46 of the diaphragm 50 to reduce the pressure in the first chamber 46. At the same time, when a non-operation signal (OFF signal) is output from the ECU 62 and the power is turned off, both ports 65 and 66 are shut off, and the first chamber 46 is opened to the atmosphere. The ECU 62 receives the engine speed signal and the throttle valve opening signal, and outputs the operation signal to the vacuum switch valve 61 when the engine speed is equal to or higher than a predetermined value and the throttle valve opening is equal to or higher than the predetermined value. It has become.

Next, the operation of the present embodiment configured as described above will be described. When both the engine speed and the throttle valve opening are smaller than the predetermined values, the ECU 62 outputs the non-operation signal to the vacuum switch valve 61. Therefore, the vacuum switch valve 61 is not energized and the first chamber 46 is exposed to the atmosphere. It is open. At this time,
The rubber film 48 of the diaphragm 50 and the operating shaft 55 are displaced to the right from the position in FIG.
Is also in the closed position (the valve closed position shown in FIG. 9B). Therefore, each variable intake valve 20 is in the closed position shown by the solid line in FIG. 9A and closes the communication port 19 of each intake pipe 12, thereby increasing the intake pipe length of each intake pipe 12. .

When both the engine speed and the throttle valve opening exceed a predetermined value, the ECU 62 outputs the operation signal to the vacuum switch valve 61, so that the vacuum switch valve 61 is energized and the vacuum tank 60 moves from the vacuum tank 60 to the diaphragm 50. Is supplied to the first chamber 46, and the pressure in the first chamber 46 is reduced. Thereby, the pressure difference between the first chamber 46 and the second chamber 47 overcomes the urging force of the spring 56, and the rubber film 48 and the operating shaft 55
And the connecting member 35 is displaced from the closed position to the open position side (the valve open position side shown in FIG. 9B). This displacement is transmitted to the eccentric shaft 29 of each variable intake valve 20 via each bearing portion 36, and thereby the eccentric amount d
Therefore, the axis O2 of each eccentric shaft 29 moves circularly around the axis O1 of the rotating shaft 23 to a point O2 '. As a result, each variable intake valve 20 is moved from the closed position as shown in FIG.
Each of the intake pipes 12 is rotated clockwise to the open position indicated by the chain line
Is opened. Thereby, the intake pipe length of each intake pipe 12 is shortened.

When both the engine speed and the throttle valve opening are smaller than predetermined values in a state where each variable intake valve 20 is in the open position, the first chamber 46 is opened to the atmosphere. Therefore, the urging force of the spring 56 overcomes the pressure difference, the rubber film 48 and the operating shaft 55 are displaced rightward from the position in FIG. 7, and the connecting member 35 is displaced from the open position to the closed position. This displacement is transmitted to the eccentric shaft 29 of each variable intake valve 20 via each bearing portion 36,
The axis O2 'of each eccentric shaft 29 moves circularly around the axis O1 to a point O2. Thereby, each variable intake valve 20 rotates counterclockwise from the open position shown by the dashed line in FIG. 9 to the closed position shown by the solid line in FIG. 9 to close the communication port 19 of each intake pipe 12. As a result, the intake pipe length of each intake pipe 12 increases again. Thus, the intake pipe length of each intake pipe 12 is switched in two modes.

According to the embodiment configured as described above, the following operation and effect can be obtained. (1) Since the rotating shafts 22 and 23 of each variable intake valve 20 are oriented along the central axis of each intake pipe 12, when each variable intake valve 20 is opened, each variable intake valve 20 is opened.
Takes a posture along the flow of air in each intake pipe 12. Therefore, when each variable intake valve 20 is opened in a high engine speed range, each variable intake valve 20 does not hinder the flow of air, and the power performance can be improved.

(2) Since each of the variable intake valves 20 is rotatably supported by the corresponding bearing 27 of each of the valve housings 24, the length of the rotating shafts 22, 23 of each of the variable intake valves 20 is reduced. Be shorter. For this reason, even if the accuracy of each variable intake valve 20 and the valve housing 24 is somewhat poor, the reliability of the operation of each variable intake valve 20, that is, the reliability of opening and closing, is improved. Thus, each variable intake valve 20 is moved from the valve housing 2 to the partition 18.
Even if a low-cost fixing method such as sandwiching in 4 is adopted,
Since sufficient operation reliability of each variable intake valve 20 is obtained, manufacturing costs can be reduced.

(3) By driving the connecting member 35 in a direction intersecting the axis, the eccentric shaft 29 of each variable intake valve 20 supported by each bearing portion 36 of the connecting member 35 is the same as the connecting member 35. The variable intake valves 20 rotate around the rotation shafts 22 and 23 to open and close. Thus, each independent variable intake valve 20 can be opened and closed by driving one connecting member 35.

(4) Eccentric shaft 29 of each variable intake valve 20
In the case where the relative positional accuracy is poor, it is possible to prevent a problem such as that the communication port 19 cannot be completely closed by the variable intake valve 20 in some of the intake pipes 12. That is, the eccentric shaft 29 of each variable intake valve 20 is supported by each bearing portion 36 of one connecting member 35 in order to move the eight variable intake valves 20 by one drive mechanism, for example, the diaphragm 50. Therefore, even when the relative positional accuracy of each eccentric shaft 29 is poor, each bearing portion 36 supporting each eccentric shaft 29 is elastically deformed by a bearing fixing portion 37 provided integrally with the eccentric shaft 29, so that the accuracy varies depending on the accuracy variation. Displace.
As a result, the variation in the relative position accuracy of each eccentric shaft 29 is absorbed, and the relative position of each eccentric shaft 29 is automatically adjusted to a normal position. Therefore, even if the positional accuracy of the variable intake valves 20 of each intake pipe 12 is somewhat poor, each communication port 19 of every intake pipe 12 can be completely closed by each variable intake valve 20.

(5) The displacement amount of each bearing portion 36 can be regulated by each displacement limiting rib 38 so that each bearing portion 36 of the connecting member 35 is not excessively displaced in the intersecting direction.

(6) The diaphragm 50 in which the connecting member 35 in the surge tank 15 is disposed outside the surge tank 15
Therefore, there is no need to provide a seal mechanism between the operating shaft 55 and the surge tank wall 45 of the intake manifold 11. Thereby, cost reduction can be achieved.

(7) Since the intake manifold 11 is made by integrating the lower manifold 13 and the upper manifold 14 divided into two parts, each component of the variable intake device according to the present invention is provided on the upper manifold 14 side. Assembly work becomes easy.

(8) Eccentric shaft 29 of each variable intake valve 20
In the state where the end of the eccentric shaft 29 is engaged with each bearing portion 36 of the connecting member 35 by snap fitting, the locking claw 31 at the tip of each eccentric shaft 29 is prevented from falling off at the end face of each bearing portion 36 as shown in FIG. And locked. Therefore, each variable intake valve 2
0 can be prevented from being detached from the connecting member 35 due to vibration or the like during operation.

(Modification) The present invention can be modified and embodied as follows. In the above-described embodiment, an example in which the present invention is applied to an intake manifold of a V-type 8-cylinder internal combustion engine has been described.However, the present invention employs a plurality of variable intake valves regardless of the type and the number of cylinders of the internal combustion engine. The present invention is applied to all variable intake devices configured to be opened and closed by one connecting member driven by a diaphragm or the like.

In the above-described embodiment, an example is shown in which each intake pipe is applied to an intake manifold located above or outside a surge tank.
As described in Japanese Patent Application Laid-Open No. 102979), the present invention can be applied to an intake manifold in which a surge tank is located above each intake pipe and both are integrated via a partition.

In the above-described embodiment, the use of the diaphragm 50 as the driving mechanism has an effect that there is no need to provide a seal mechanism. However, this effect cannot be obtained, but the motor and the solenoid valve are used as the driving mechanism. Etc. may be used.

In the above embodiment, eight independent valve housings 24 are used. However, one valve housing in which these valve housings 24 are integrally formed may be used.

[Brief description of the drawings]

FIG. 1 is a perspective view, partially cut away, of an intake manifold of a V-type 8-cylinder internal combustion engine provided with a variable intake device according to one embodiment.

FIG. 2 is an exploded perspective view of the intake manifold shown in FIG.

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 is an enlarged perspective view showing a part of a connecting member shown in FIG. 1;

FIG. 5 is a plan view of the variable intake valve shown in FIG. 1;

FIG. 6 is a perspective view showing a state where one variable intake valve is assembled to the connecting member shown in FIG. 1;

FIG. 7 is a cross-sectional view showing a junction of a diaphragm with a surge tank wall of an intake manifold.

FIG. 8 is a schematic configuration diagram showing a diaphragm control device.

9A is an explanatory view showing a state where a variable intake valve opens and closes due to a displacement of a connecting member, and FIG. 9B is an explanatory view showing opening and closing of the valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Intake manifold, 12 ... Intake pipe, 15 ... Surge tank, 18 ... Partition wall, 19 ... Communication port, 20 ... Variable intake valve, 22, 23 ... Rotating shaft, 27, 36 ... Bearing part, 2
9: eccentric shaft, 35: connecting member, 37: bearing fixing part, 3
8: displacement limiting rib (displacement limiting portion), 45: surge tank wall, 46: first chamber, 47: second chamber, 50: diaphragm, 55: operating shaft, 56: spring.

Claims (6)

[Claims] 1. An intake pipe and a surge tank are partitioned and integrated by a partition, and each communication port provided in the partition for each intake pipe is opened and closed by each variable intake valve.
A variable intake device for an internal combustion engine, wherein an intake pipe length is variable, wherein a rotation axis of each of the variable intake valves is set in a direction along a central axis of each of the intake pipes. 2. The internal combustion engine according to claim 1, wherein a rotation shaft of each of the variable intake valves is independently rotatably supported by a valve support member provided in the surge tank. Variable intake system for the engine. 3. An eccentric shaft eccentric to the rotary shaft is provided integrally with the rotary shaft of each of the variable intake valves, and an end of each eccentric shaft intersects the axis of the rotary shaft. The variable intake of an internal combustion engine according to claim 1 or 2, wherein a plurality of bearing portions of the connecting member driven in the directions are supported so that displacement of the connecting member is transmitted to each eccentric shaft. apparatus. 4. The bearing member according to claim 1, wherein the plurality of bearing portions of the connecting member are independently provided integrally with a bearing fixing portion elastically deformable in a direction intersecting with the axis of the rotating shaft. Item 4. The variable intake device for an internal combustion engine according to any one of Items 1 to 3. 5. A displacement limiting portion for limiting displacement of each bearing portion in a direction intersecting with the axis of the rotating shaft is provided near each of the plurality of bearing portions of the connecting member. The variable intake device for an internal combustion engine according to claim 4, wherein 6. A first chamber whose introduction pressure is controlled and a second chamber communicating with the surge tank are separated by a movable membrane on a surge tank wall of an intake manifold in which each of the intake pipes and the surge tank are integrated. The connecting member is connected to an operating shaft having an end fixed to the movable membrane and protruding into the surge tank, and the movable membrane is further pushed in a direction to push the operating shaft into the surge tank. Is biased by a spring.
A variable intake device for an internal combustion engine according to any one of the preceding claims.