JPH0515535Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is used in a mounting structure for a variable intake control valve.

[Conventional technology]

There is something called a variable intake control valve (for example, Utility Model Application No. 15877, 1983, previously filed by the present applicant).

A variable intake control valve is a valve that can vary the effective intake pipe length of the engine. Effective intake pipe length is the "substantive" length of an engine's intake pipe with respect to resonance of air column vibrations.

The variable intake valve will be briefly explained based on FIG.

FIG. 7 is a schematic diagram of the engine. In Fig. 7, 1 is the engine, 2 is the exhaust manifold, and 3 is the engine.
is an intake pipe, 4 is a surge tank, 5 is a throttle valve, and 6 is an air cleaner.

In FIG. 7, 11 is a variable intake control valve.
When the variable intake control valve 11 is open, the inside of the surge tank 4 is in communication and becomes one, but when the variable intake control valve 11 is closed, the inside of the surge tank 4 is divided into two chambers 12 and 12. Divided into 13. That is, the variable intake control valve 11 is a valve that can partition the inside of the surge tank 4 into two chambers 12 and 13.

The surge tank 4 has two intake passages 14 and 15.
is connected. And two intake passages 1
4 and 15, intake air can be supplied to the surge tank 4.

When the variable intake control valve 11 is closed and the interior of the surge tank 4 is partitioned into two chambers 12 and 13, the two intake passages 14 and 15 are connected so that intake air can be supplied to each chamber independently. ing.

By the way, in FIG. 7, the variable intake control valve 11
is open, the effective intake pipe length of the engine is l
However, if the variable intake control valve 11 is closed, the effective intake pipe length of the engine is L. Here, L>l.

At low engine speeds, the longer the effective intake pipe length, the better the engine output. Conversely, when the engine rotates at high speeds, the shorter the effective intake pipe length, the better the engine output will be.

Therefore, in the engine shown in FIG. 7, the variable intake control valve 11 is controlled to be closed when the engine is running at low speeds, and the variable intake control valve 11 is controlled to be open when the engine is at high speeds.

The above is an outline of the variable intake control valve 11.

The reason why the effective intake pipe length changes to l or L depending on the opening and closing of the variable intake control valve 11, and the reason why the effective intake pipe length required by the engine changes depending on the engine speed, have been explained so far. Since it is well known and has no direct relation to the present invention, it will not be explained here.

Since the present invention relates to a mounting structure for a variable intake control valve, a conventional mounting structure for a variable intake control valve will be described.

FIG. 8 is a front view of a conventional variable intake control valve mounting structure. In FIG. 8, 11 is a variable intake control valve.

The variable intake control valve 11 has screws 28, 2 on the valve shaft 22.
9.

The variable intake control valve 11 is opened and closed by rotating the valve shaft 22 in the direction of arrow AB.

9a is a front view of the variable intake control valve, and FIG. 9b is a sectional view taken along line bb in FIG. 9a.

As can be seen from Fig. 9b, the tip of the variable intake control valve 11 has an acute angle portion 25 and an obtuse angle portion 26. The difference α between the angles of the acute angle portion 25 and the obtuse angle portion 26 is 6 degrees.

FIG. 10 is a schematic diagram showing a state in which the variable intake control valve 11 is closed. In FIG. 10, 11 is a variable intake control valve, and 4 is a surge tank.

There are two points to pay attention to in FIG. 10:

First, when the variable intake control valve 11 is closed, the variable intake control valve 11 is not straight, but is slightly inclined.

Secondly, and this is the most important point, when the variable intake control valve 11 is closed, the variable intake control valve 11 abuts against the inner wall surface 31 of the surge tank 4 at the obtuse angle portion 26.

Note that, in reality, the closed position of the variable intake control valve 11 is determined by a stopper (not shown), so the obtuse angle portion 26 of the variable intake control valve 11 and the inner wall surface 31 of the surge tank 4 do not come into contact with each other. There is a very small gap between them. This gap is such a gap that it can become zero if the engine is used for a long time. Hereinafter, in this specification, for convenience of explanation, the obtuse angle portion 26
Although the description will be made assuming that the inner wall surface 31 of the surge tank 4 contacts the inner wall surface 31 of the surge tank 4, in reality, as described above, an extremely small gap exists.

By the way, the tip of the variable intake control valve 11 is composed of an acute angle part 25 and an obtuse angle part 26, and the reason why the obtuse angle part 26 is brought into contact with the inner wall surface 31 of the surge tank 4 is due to the following two reasons. Depends on the reason.

First, when the variable intake control valve 11 is closed,
This is to prevent the tip of the variable intake control valve 11 from getting caught in the inner wall surface 31 of the surge tank 4.

That is, if the variable intake control valve 11 is made to contact the inner wall surface 31 of the surge tank 4 at the acute angle portion 25 as shown in FIG. may get caught in the inner wall surface 31 of the surge tank 4. If this happens, the variable intake control valve 11 will not open. This is the first reason.

The second reason is to make the gap as small as possible when the variable intake control valve 11 is closed.

That is, if the tip of the variable intake control valve 11 were to have two right-angled portions 33, as shown in FIG.
34, when the variable intake control valve 11 is closed, the inner wall surface 31 of the surge tank 4
This is because there is a large gap between them. This is the second reason.

It goes without saying that when the variable intake control valve 11 should be closed, it should be able to close as completely as possible. If there is a gap when the variable intake control valve 11 should be closed, the effect of the variable intake control valve will be weakened to that extent, and it will not be possible to improve the output by that much.

In addition, as shown in FIG. 13, two right-angled portions 33,
It goes without saying that if the variable intake control valve 11 composed of the valve 34 is closed diagonally, jamming will become a problem as described with reference to FIG.

Therefore, this is also the reason why the tip of the variable intake control valve 11 is composed of an acute angle portion 25 and an obtuse angle portion 26.

Returning to FIG. 8, in the conventional variable intake control valve 11 shown in FIG.
It should be noted that the variable intake control valve 11 was fixed to the valve stem 22 by screws 28 and 29 at positions equidistant from the center 24 in the axial direction of the valve stem 22.

In FIG. 8, the notches labeled 41 and 42 are used to connect the variable intake control valve 11 to the screw 28,
29 is for positioning the variable intake control valve 11 and the valve shaft 22.

For convenience of explanation, in FIG. 8, the surfaces of the variable intake control valve 11 are designated with numerals 43 and 44 as shown, and the surfaces of the valve shaft 22 are also designated with numerals 45 and 46. Here, the state where the reference numeral 43 and the reference numeral 45 are opposite to each other, and the reference numeral 44 and the reference numeral 46 are opposite to each other is the normal installation state, that is, when the variable intake control valve 11 is closed, the 10th As shown in the figure, the obtuse angle portion 26 corresponds to the inner wall surface 3 of the surge tank 4.
Assume that the mounting state is such that it is in contact with 1.

In such a thing, if the code 43
When the variable intake control valve 11 is attached to the valve shaft 22 so that the numbers 44 and 46 face each other, and the numbers 44 and 45 face each other, when the variable intake control valve 11 is closed, as shown in FIG. As shown in FIG. 2, the acute angle portion 25 comes into contact with the inner wall surface 31 of the surge tank 4.

In order to prevent such problems from occurring, in the conventional valve shown in FIG. 8, a mark is attached to the surface of the variable intake control valve 11.

[Problem that the invention attempts to solve]

However, in the conventional device shown in FIG. 8, although it is rare, the operator misreads the marks, and the numbers 43 and 46 end up facing each other, and the numbers 44 and 45 end up facing each other. Towards
There was a problem that the variable intake control valve 11 was attached to the valve shaft 22 (that is, it was incorrectly assembled).

The present invention solves these problems of the conventional technology.

The technical problem of the present invention is to prevent the variable intake control valve from being attached to the valve shaft in the wrong direction.

[Means for solving problems]

In order to achieve this technical problem, the following measures are taken in the present invention.

That is, the mounting structure of the variable intake control valve according to the present invention is a disc-shaped valve that changes the effective intake pipe length of the engine by dividing the inside of the surge tank into two chambers or communicating them. A variable intake control valve is provided. The tip of the variable intake control valve is composed of an acute angle part and an obtuse angle part. When the variable intake control valve is closed to partition the inside of the surge tank into two chambers, the obtuse angle portion is in contact with or comes closest to the inner wall surface of the surge tank. The variable intake control valve is fixed to the valve stem with two screws, and the portion of the valve stem where the variable intake control valve is attached is cut out in a planar shape. The distance from the center of the variable intake control valve to the mounting position of the two screws in the axial direction of the valve stem differs for each screw.

The above are the measures taken in the present invention.

[Effect]

In the present invention, as described above, the positions of the screws are asymmetrical with respect to the center of the variable intake control valve, and only the portion of the valve shaft where the variable intake control valve is attached is cut into a planar shape.

Therefore, even if you try to attach the variable intake control valve to the valve stem in the wrong direction, the screw mounting holes drilled in the variable intake control valve and the screw mounting holes drilled in the valve stem will not align. Therefore, the variable intake control valve cannot be attached to the valve stem.

Thus, according to the present invention, the variable intake control valve will not be attached to the valve stem in the wrong direction.

In addition to the method of the present invention, it is also possible to attach different sizes to the screws if the only purpose is to prevent the variable intake control valve from being attached to the valve shaft in the wrong direction.

However, in this case, two types of screws, large and small, are required, so managing the screws takes time.

Furthermore, the machine for assembling the screws also requires a more complex machine. Therefore, the cost will increase.

On the other hand, in the present invention, since the screws are the same, there is no increase in cost. This point is also one of the features of the present invention.

The effect of the present invention will be made clearer from the following examples.

〔Example〕

FIG. 1 is a front view of a variable intake control valve mounting structure according to an embodiment of the present invention.

In FIG. 1, 11 is a variable intake control valve. The variable intake control valve 11 is a valve that can partition the inside of a surge tank (not shown) into two chambers.

As can be seen from FIG. 1, the variable intake control valve 11
is fixed to the valve shaft 22 with screws 28 and 29.

In the surge tank (not shown), the variable intake control valve 11 is opened and closed by rotating the valve shaft 22 in the direction of arrow AB.

In FIG. 1, the notches labeled 41 and 42 are used to connect the variable intake control valve 11 to the screws 28 and 42.
29 is for positioning the variable intake control valve 11 and the valve shaft 22.

FIG. 2 is an exploded side view of a variable intake control valve mounting structure according to an embodiment of the present invention.

In FIG. 2, 11 is a variable intake control valve. The variable intake control valve 11 has a screw 28 on the valve shaft 22,
29. Variable intake control valve 11
Attachment holes 48 and 49 for screws 28 and 29 are bored in the. Further, reference numerals 51 and 52 refer to the valve shaft 22.
This is the mounting hole for the screw.

Although the valve stem 22 itself is a round rod, a portion 59 of the valve stem 22 to which the variable intake control valve 11 is attached
As you can see from the diagram, the only part is carved flat.

The shape and state of the variable intake control valve 11 when it is closed are exactly the same as those described in the section of the prior art.

That is, as can be seen from FIG. 9a, the variable intake control valve 11 of this embodiment also has an acute angle portion 25 and an obtuse angle portion 26 at its tip. The angular difference α between the acute angle portion 25 and the obtuse angle portion 26 is 6 degrees.

Further, as described with reference to FIG. 10, when the variable intake control valve 11 is closed, the variable intake control valve 11 is not straight but slightly inclined. Further, when the variable intake control valve 11 is closed, the variable intake control valve 11 has an obtuse angle portion 2
6, it is in contact with the inner wall surface 31 of the surge tank 4.

FIG. 4 is a top view of the surge tank to which the variable intake control valve of FIG. 1 is attached.

In FIG. 4, 4 is a surge tank. Arrow Q represents the flow of intake air taken into the engine. The surge tank 4 is attached to the engine in the direction of arrow Z via an intake manifold (not shown).

In FIG. 4, 22 is a valve shaft of the variable intake control valve 11. As the valve shaft 11 is rotated by the diaphragm device 53, a variable intake control valve (not shown) is opened and closed. The opening/closing conditions of the variable intake control valve are as described in the prior art section, so a description thereof will be omitted.

FIG. 5 is a side view of the surge tank to which the variable intake control valve of FIG. 1 is attached (as seen from the direction of arrow V in FIG. 4).

In FIG. 5, 4 is a surge tank, 19 is a blind plug, 22 is a valve stem, and 53 is a diaphragm device.

The surge tank 4 is attached to the engine in the direction of arrow Z via an intake manifold (not shown).

FIG. 6 is a cross-sectional view of FIG. 6th
In the figure, 4 is a surge tank, 11 is a variable intake control valve, and 22 is a valve shaft.

As can be seen from FIG. 6, the variable intake control valve 11
The inside of the surge tank 4 can be partitioned into two chambers 12 and 13. That is, when the variable intake control valve 11 is open, the inside of the surge tank 4 is connected and integrated into one, but when the variable intake control valve 11 is closed, the inside of the surge tank 4 is divided into two chambers. 12,1
Divided into 3.

Returning to FIG. 4, two intake passages (not shown) are connected to the surge tank 4. code 61,
62 is a flange that connects these two intake passages. Intake air can be supplied to the surge tank 4 through the two intake passages.

In FIG. 6, the variable intake control valve 11 is closed and the inside of the surge tank 4 is divided into two chambers 12 and 13.
When partitioned into two, the two intake passages can supply intake air to each chamber independently.

Everything up until now is exactly the same as before. Returning to FIG. 1, this embodiment is characterized by the mounting positions of the screws 28 and 29.

In FIG. 1, the point designated by reference numeral 24 is the center of the variable intake control valve 11. center 2
The distance from 4 to the mounting position of the two screws 28, 29 differs for each screw 28, 29. This point is a feature of this embodiment.

The distance from center 24 to screw 29 is a, center 2
4 to the screw 28 is b, in this embodiment, a-b=about 3 mm.

Naturally, in FIG. 2, the screw attachment holes 48 and 49 in the variable intake control valve 11 and the screw attachment holes 51 and 52 in the valve shaft 22 are also set to have a width of about 3 mm.

The operation of this embodiment will be explained.

For convenience of explanation, in FIG. 1, the surfaces of the variable intake control valve 11 are denoted by numerals 43 and 44 as shown, and the surfaces of the valve shaft 22 are also denoted by numerals 45 and 46.

Here, the state in which the reference numeral 43 and the reference numeral 45 are opposite to each other, and the reference numeral 44 and the reference numeral 46 are opposite to each other is the normal installation state, that is, when the variable intake control valve 11 is closed. As shown in FIG. 10, it is assumed that the mounting state is such that the obtuse angle portion 26 is in contact with the inner wall surface 31 of the surge tank 4.

In this embodiment, as mentioned above, the positions of the screws 28 and 29 are asymmetrical with respect to the center 24, and only the portion of the valve shaft 22 where the variable intake control valve 11 is attached is as shown in FIG. Since they are cut flat, as shown in FIG. 3, the numbers 43 and 46 face each other, and the numbers 44 and 4
Even if you try to attach the variable intake control valve 11 to the valve shaft 22 so that the variable intake control valves 5 and 5 face each other, the screw attachment holes 48 and
49 and screw mounting holes 51 and 52 formed in the valve shaft 22 do not match, so the variable intake control valve 11 cannot be attached to the valve shaft 22.

Thus, according to this embodiment, the variable intake control valve 1
1 will not be attached to the valve stem 22 in the wrong direction.

Incidentally, if only to prevent the variable intake control valve 11 from being attached to the valve shaft 22 in the wrong direction,
In addition to the method of this embodiment, screws 28, 2
It is also possible to add a size to 9.

However, in this case, two types of screws, large and small, are required, so managing the screws takes time.

Furthermore, the machine for assembling the screws also requires a more complex machine. Therefore, the cost will increase.

However, in this embodiment, since the screws 28 and 29 are the same, the cost will not increase. This point is also one of the features of this embodiment.

[Effect of idea]

As can be seen from the description of the above embodiments, the present invention has the effect that the variable intake control valve will not be attached to the valve shaft in the wrong direction.

[Brief explanation of the drawing]

FIG. 1 is a front view of a mounting structure for a variable intake control valve according to an embodiment of the present invention, and FIG. 2 is an exploded side view of the mounting structure for a variable intake control valve according to an embodiment of the present invention. 3 is an explanatory diagram for explaining the operation of the present invention, FIG. 4 is a front view of a portion of the surge tank to which the variable intake control valve of FIG. 1 is attached, and FIG. A side view of the surge tank to which the variable intake control valve is attached (as seen from the direction of arrow V in FIG. 4), FIG. 6 is a cross-sectional view taken from the side shown in FIG. 5, and FIG. 7 illustrates the variable intake control valve. A schematic diagram of the engine for
Front view of the conventional variable intake control valve mounting structure,
FIG. 9a is a front view of the variable intake control valve, FIG. 9b is a sectional view taken along line bb of FIG. 9a, and FIG. FIG. 11 is a vertical cross-sectional view of a portion of another variable intake control valve, FIG. 12 is an explanatory diagram for explaining that the variable intake control valve as shown in FIG. 11 bites into the inner wall surface of the surge tank, FIG. 13 is a longitudinal sectional view of a portion of another variable intake control valve. 4... Surge tank, 11... Variable intake control valve, 12, 13... Chamber, 22... Valve shaft, 24...
Center of variable intake control valve, 25...Acute angle part, 26
... Obtuse angle part, 28, 29 ... Screw, 31 ... Inner wall surface of surge tank, 59 ... Planar cutout part in valve stem.

Claims (1)

[Claims for Utility Model Registration] A disc-shaped variable intake control valve is provided that changes the effective intake pipe length of the engine by partitioning the interior of the surge tank into two chambers or communicating them. The tip of the variable intake control valve is composed of an acute angle part and an obtuse angle part, and when the variable intake control valve is closed to partition the interior of the surge tank into two chambers, the obtuse angle part The variable intake control valve is in contact with or closest to the inner wall surface of the surge tank, and the variable intake control valve is fixed to the valve shaft with two screws, and the variable intake control valve is fixed to the valve shaft with two screws. In the variable intake control valve mounting structure in which the mounted portion is cut out in a planar shape, the distance from the center of the variable intake control valve to the mounting position of the two screws in the axial direction of the valve shaft is: A variable intake control valve installation structure characterized by each screw being different.