JPH0531217Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention is intended to be applied to parts of the intake system such as the cylinder head, intake manifold, or intake collector in order to control intake air swirl in the combustion chamber, intake inertia supercharging effect, etc. The present invention relates to an improvement in an intake control valve device for an internal combustion engine which is provided with a butterfly valve type valve body.

2. Description of the Related Art For example, in a multi-cylinder internal combustion engine, in order to effectively utilize the inertial supercharging effect of intake air, the intake collector section is separated into two parts, each with a cylinder whose intake stroke is not continuous (for example, #1, #3, # 5 cylinder and #2,
#4 and #6 cylinders), and a plate-shaped valve body is provided in the communication section between both collector sections, and the actual intake pipe length is controlled by opening and closing the valve body (for example, the Showa "Nitsun Leopard Maintenance Instructions" B-16, 17 issued by Nissan Motor Co., Ltd. in February 1961
(See pages, etc.)

In addition, for purposes such as controlling swirl in the combustion chamber, a plate-shaped valve body is installed on one side of the intake passages provided in each cylinder, and the valve body is opened and closed according to operating conditions. Valve devices are also known (for example, Japanese Patent Publication No. 60-60007).

In such an intake control valve device, generally, at least both ends of a shaft to which a plate-shaped valve body is fixed are supported by a housing such as an intake manifold directly or via a bearing metal, and
An actuator such as a diaphragm type actuator is linked to one end of the shaft, and the valve element is opened and closed by this actuator.
The bearing portion of the shaft is provided with an appropriate clearance to ensure smooth rotation of the shaft.

Problems to be Solved by the Invention As mentioned above, in an intake control valve device in which a plate-shaped valve body is provided as a part of the intake system, fluctuations in intake pressure and pulsation occur, especially when the valve body is closed. As a result, a fairly large force is applied to the valve body. in this case,
The end of the shaft on the actuator side is pressed and restrained in the radial direction by the force of the actuator, so vibrations are less likely to occur, but the end on the opposite side of the actuator is free, causing the above-mentioned intake pulsation, etc. Easy to vibrate due to

Therefore, due to the existence of the above-mentioned clearance, hitting noise is likely to be generated at the end on the side opposite to the actuator, and uneven wear of the bearing portion may occur.

Means for Solving the Problems Therefore, this invention has a shaft having bearing parts at least at both ends, a plate-shaped valve body is fixed between the bearing parts, and an actuator is attached to one end of the shaft. In the linked intake control valve device for an internal combustion engine, the clearance of the bearing portion of the shaft is set to be smaller on the side opposite to the actuator than on the actuator side.

Effect As described above, by setting the clearance of the bearing on the side opposite to the actuator to a small value, the amount of movement of the shaft on the side opposite to the actuator itself becomes small, and the end on the actuator side is moved in the radial direction by the force of the actuator. When the actuator is pressed down, the force that tries to press the opposite end of the actuator in the opposite direction increases as a reaction.
Vibration is suppressed.

Embodiment FIGS. 1 to 3 show an embodiment in which the present invention is applied to an intake control valve device mounted on an intake collector section for the above-mentioned inertial supercharging control.

In the figure, 1 is an atsupa body having a plate portion 1a and a cylindrical portion 1b, and 2 is the cylindrical portion 1.
As shown in FIG. 3, the lower body 2 has relatively large openings 3 and 4 formed on both sides except for a central strip 2a.

In addition, the above-mentioned Atsupa Body 1 and Lower Body 2
As shown in FIG. 1, bearing metals 5 and 6 are fixed to the center of the shaft 7, respectively, and are rotatably fitted to bearings 7a and 7b at both ends of the shaft 7. In FIG. 1, 8 is a sealing member that seals between the shaft 7 and the atsupa body 1;
is a holding plate that holds this seal member 8.
Further, a rectangular plate-shaped valve body 10 is fixed between the bearing parts 7a and 7b of the shaft 7 with screws 11, and the valve body 10 is fixed to the shaft 7 with a screw 11. The openings 3 and 4 are configured to open and close as the shaft 7 rotates.

On the other hand, a base plate 12 is fixed to the upper surface of the Atsupa body 1 with bolts 13, and at the end of this base plate 12,
An actuator, specifically a diaphragm negative pressure actuator 14, is attached, and the tip of its rod 15 is linked to one end of the shaft 7 via a link plate 16. The link plate 16 has stopper portions 16a and 16b that respectively correspond to the fully open position and the fully closed position of the valve body 10, and the link plate 16 has stopper portions 16a and 16b that respectively correspond to the fully open position and the fully closed position of the valve body 10, and by abutting against a body side stopper 17 formed protrudingly on the upper surface of the atsupa body 1, the valve body 10 can be opened. body 1
0 rotation range is regulated. Note that when negative pressure is not introduced into the negative pressure chamber 18 of the negative pressure actuator 14, the urging force of the set spring 19 causes the stopper portion 16a to close to the body side stopper 17.
The valve body 10 is in a fully open state as shown in FIG.

Bearing portions 7a at both ends of the shaft 7,
The clearance at 7b is set so that the anti-actuator side, that is, the lower body 2 side, is smaller than that on the actuator side, that is, the upper body 1 side. For details, see the bearing section 7 of the shaft 7.
The outer diameters of a and 7b are the same, and the clearance is adjusted by changing the inner diameter of the bearing metals 5 and 6 that fit there. Specifically, the clearance on the Atsupa body 1 side is adjusted to 0.084 to 0.200. Approximately mm, the clearance on the lower body 2 side is 0.024 ~
It is set to be approximately 0.140 mm, and within that range, the lower body 2 side is set to be smaller than the upper body 1 side. In addition, on the outer peripheral surface of the shaft 7,
It is coated with fluorine resin in advance.

Now, in the above configuration, the valve body 10
When the valve body 1 is fully closed, a large force is applied to the valve body 10 due to fluctuations and pulsations in the intake pressure. 2, and as a result, it is strongly pressed against one side of the bearing metal 5, so even if a certain amount of clearance exists as described above, it will not vibrate. Further, since the end of the shaft 7 on the lower body 2 side has a small clearance with the bearing metal 6, that is, the amount of movement of the shaft 7 itself is small, the vibration is suppressed and the tensile force of the negative pressure actuator 14 mentioned above is suppressed. Accordingly, the force that presses the end of the shaft 7 against one side of the bearing metal 6 (in the opposite direction to the biasing force direction in the bearing metal 5 on the Atsupa body 1 side) is
Increased by reducing the clearance,
Similar to the Atsupa body 1 side, it is difficult to vibrate.

Therefore, generation of abnormal noise due to vibration of the shaft 7 and uneven wear of the shaft 7 are prevented. Further, since only the lower body 2 side has a relatively small clearance, the shaft as a whole can rotate smoothly like the conventional shaft, and there is no risk of malfunction.

In the above embodiment, the diaphragm negative pressure actuator 14 is used as the actuator, but it goes without saying that a solenoid, a motor, etc. can be used instead.

Next, the embodiment shown in FIG. 4 shows an example in which a shaft 22 of an intake control valve device is directly fitted and supported in a housing 21 such as an intake collector section.

In this embodiment, the housing 21
A shaft fitting hole 23 having approximately the same diameter is formed across the pair of intake passages 24, 24, and the shaft 22 is inserted therethrough. This shaft 22 has a first bearing part 25, a second bearing part 26, a third bearing part 27, a fourth bearing part 28, and a fifth bearing part 29 that fit into the inner peripheral surface of the shaft fitting hole 23. , between the first bearing part 25 and the second bearing part 26, and between the second bearing part 26 and the third bearing part 27, so that they do not come into contact with the inner peripheral surface of the shaft fitting hole 23. It is formed with a small diameter. Further, a disc-shaped valve body 30, which opens and closes the intake passages 24, 24, between the third bearing part 27 and the fourth bearing part 28, and between the fourth bearing part 28 and the fifth bearing part 29, respectively; 30 is fixed with screws 31. Further, an actuator (not shown) is connected to the proximal end of the shaft 22 protruding from the shaft fitting hole 23 via a link plate 32. Note that 33 is a sealing member.

In this embodiment, the first and second bearing portions 2 located on the actuator side of the shaft 22 are
The diameters of the bearings 5 and 26 are relatively small, and the third, fourth and fifth bearing parts 27, which are located on the side opposite to the actuator,
The diameters of 28 and 29 are relatively large,
As a result, compared to the clearance in the first and second bearing parts 25 and 26 on the actuator side, the third, fourth and fifth bearing parts 2 on the side opposite to the actuator
The clearances at points 7, 28, and 29 are slightly smaller.

As a result, as in the embodiment described above, vibration of the shaft 22 is suppressed and smooth operation can be ensured. Of course, it is more desirable if the diameter is gradually increased from the first bearing part 25 to the fifth bearing part 29.

Although one embodiment of this invention has been described above, this invention is not limited to the above-mentioned embodiment, and there are various types of devices installed in cylinder heads, intake manifolds, etc. for swirl control, intake flow rate control, etc. It can be applied to an intake control valve device.

Effects of the invention As is clear from the above explanation, the intake control valve device for an internal combustion engine according to the invention can suppress vibrations of the shaft caused by fluctuations in intake pressure, etc., without impairing smooth opening/closing operation. It is possible to prevent the generation of abnormal noise and uneven wear of the bearing due to the vibration.

[Brief explanation of the drawing]

Fig. 1 is a sectional view taken along the - line in Fig. 2 showing an embodiment of this invention, Fig. 2 is a top view of this embodiment, Fig. 3 is a side view, and Fig. 4 is a sectional view of this invention. It is a front view showing a different example. 1...Atsupa body, 2...Lower body, 5,
6...Bearing metal, 7...Shaft, 7a, 7b
...Bearing section, 10 ... Valve body, 14 ... Negative pressure actuator, 21 ... Housing, 22 ... Shaft, 23 ... Shaft fitting hole, 25 to 29 ... First to fifth bearing parts, 30 ... Valve body.

Claims (1)

[Scope of utility model registration request] The shaft has a bearing portion at least at both ends,
In an intake control valve device for an internal combustion engine, a plate-shaped valve body is fixed between the bearing portions, and an actuator is linked to one end of the shaft,
An intake control valve device for an internal combustion engine, characterized in that the clearance of the bearing portion of the shaft is set to be smaller on the side opposite to the actuator than on the actuator side.