JP2000088688A - Pressure detector for internal combustion engine - Google Patents

Abstract

[PROBLEMS] To prevent a wall flow 17 from flowing into an inlet outer cylinder 180 of a pressure extraction pipe 18 formed on an end face of a gas filter 12, thereby enabling an intake pipe pressure detector 10 to perform accurate intake. Provided is a pressure detection device for an internal combustion engine that can output pipe pressure. A gap (9) is provided between an inlet outer cylinder (180) of a pressure extraction pipe (18) formed on an end face of a gas filter (12) and a protrusion-shaped overlay (7), and a projection-shaped meat is provided around the inlet outer cylinder (180). Since the prime 7 is provided in the intake surge tank 1,
The liquid substance 17 flowing along the inner wall surface of the intake surge tank 1 flows around the projection-shaped overlay 7. Further, even if the liquid substance 17 flows over the projection-shaped buildup 7, the inlet outer cylinder 180 of the pressure extraction pipe 18 formed on the end face of the gas filter 12 and the projection-shaped buildup 7 are formed. The gap 9 between them prevents the liquid substance 17 from entering the inlet outer cylinder 180 of the pressure extraction pipe 18 formed on the end face of the gas filter 12 beyond the gap 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure detector for detecting the pressure of an intake pipe of an internal combustion engine for an automobile, for example, by an intake pipe pressure detector.

[0002]

2. Description of the Related Art FIG. 10 is a perspective view of an entire internal combustion engine equipped with a conventional internal combustion engine pressure detecting device. As shown in FIG. 10, when detecting the internal pressure of the intake surge tank 1 of the internal combustion engine 200 for an automobile or the like, the inlet outer cylinder 180 of the pressure extraction pipe 18 is attached to the mounting hole 20 formed in the side surface of the intake surge tank 1. The intake pipe pressure detector 10 is connected to the intake surge tank 1 via a pipe such as a rubber hose 11 and a gas filter 12. Pressure release pipe 18
The inlet outer cylinder 180 is installed by adopting a screw-in structure so that the intake surge tank 1 does not leak. The pressure inside the intake surge tank 1 is
8 inlet outer cylinder 180, gas filter 12, rubber hose 1
After that, the pressure is introduced into the intake pipe pressure detector 10 and detected.

At this time, in the conventional internal combustion engine, an intake pressure outlet, that is, an inlet outer cylinder 18 of a pressure outlet pipe 18 is used.
The installation position of 0 was not particularly limited. Many of the installation positions of the inlet cylinder 180 of the pressure extraction pipe 18 found in the market are separated from the throttle valve S to reduce the influence of complicated airflow, and at least as close to the internal combustion engine 200 as possible, and The mounting hole 20 is located near the manifold 100. Also, the pressure extraction pipe 18
Is considered simply to be in communication with the intake surge tank 1, and no effective installation method has been devised for the purpose of making it difficult for dirt inside the intake surge tank 1 to enter.

However, as will be described in detail later, according to experiments conducted by us, a liquid substance, for example, water, flowing on the inner wall surface of the intake surge tank 1 depends on its installation position. A phenomenon that is easy to penetrate into has been confirmed. According to the present invention, an optimum installation structure and an installation position at which dirt inside the intake surge tank 1 hardly enters are obtained based on experimental results.

[0005]

FIG. 11 is a partial cross-sectional perspective view of an intake surge tank portion and an air cleaner portion provided with a conventional pressure detecting device, and FIG. 12 is taken along a central axis showing the entire conventional pressure detecting device. FIG. (However, the intake pipe pressure detector 10 is not a sectional view.) By the way, as shown in FIG.
Blow-by gas containing liquid substances such as water and oil 1
3 and the EGR gas 14, and furthermore, the water 16 from the air cleaner 15 wet by rain or the like flows in and is filled. These liquid substances flow as a wall flow 17 on the inner wall surface of the intake surge tank 1.

In some cases, as shown in FIG. 12, the wall flow 17 flows through the inlet outer cylinder 180 of the pressure extraction pipe 18 of the gas filter 12 and flows into the gas filter 12, where the gas flow generated during operation of the internal combustion engine causes gas exchange. , The metallic filter 191 and the nonwoven fabric filter 192,
It flows inside the rubber hose 11 and finally reaches the intake pipe pressure detector 10, which may hinder the operation of the intake pipe pressure detector 10.

As means for preventing the above-mentioned liquid substance from entering the intake pipe pressure detector, for example, Japanese Patent Application Laid-Open No.
As disclosed in Japanese Patent Publication No. 178630, there is a method in which the position of the intake pipe pressure detector is set higher than the position at which pressure is taken out, and the internal capacity of a rubber hose to be connected is set to a certain value or less to prevent liquid material from entering. However, we set the position where the pressure is taken out at various positions of the intake surge tank, put the liquid material from the upstream of the intake surge tank, and measure the amount of liquid material flowing into the pipe installed at the position where the pressure is taken out As a result of conducting an experiment to do
It was found that if the position where the pressure was taken was below the intake surge tank, the number of times of contact with the wall flow increased, and the liquid material easily penetrated. Further, it has been found that the intruded liquid substance easily enters the intake pipe pressure detector due to gas exchange. Therefore, this measure is not very effective.

Further, Japanese Patent Application Laid-Open No. Sho 63-229341,
JP-A-2-124440, JP-A-3-27793
No. 5, JP-A-6-129935, JP-A-6-129935
Although there is a method of removing contaminants and liquid substances by fresh air as disclosed in Japanese Patent Publication No. 137984, there is a limitation in that it must be installed near the idle air flow path of the throttle body due to its structure.

Further, as disclosed in Japanese Patent Application Laid-Open No. 63-295940, there is a method in which a penetrated liquid substance (in this case, water) is removed by evaporation by electric heating. There is also a problem that extra devices, circuits and the like must be attached. The present invention can prevent an intake pipe pressure detector from detecting an accurate intake pipe pressure by preventing a liquid wall flow flowing through an intake surge tank inner wall of an internal combustion engine from flowing into an intake pipe pressure detector. An object of the present invention is to provide a pressure detection device for an internal combustion engine.

[0010]

The present invention employs the technical means described in claims 1 to 8 to solve the above-mentioned problems. According to the first aspect of the present invention, a gap is provided between the inlet outer cylinder of the pressure extraction pipe and the inner surface of the protrusion-shaped overlay, and the protrusion-shaped overlay is provided around the inlet outer cylinder in the intake surge tank. Because of the provision, the liquid substance flowing along the inner wall surface of the intake surge tank flows around the protrusion-shaped overlay. Even if the liquid material flows over the protrusion-shaped buildup, the liquid material will exceed the gap due to the gap between the inlet outer cylinder of the pressure extraction pipe and the protrusion-shaped buildup inner surface. Intrusion from the inlet tube of the take-out tube is prevented.

According to the second aspect of the present invention, since the height of the projection-shaped overlay is set higher than the inlet outer cylinder of the pressure extraction pipe, the liquid substance is directly injected from the inlet outer cylinder of the pressure extraction pipe. Intrusion is effectively prevented. Claim 3
According to the invention described in the above, since it is configured separately from the intake surge tank as a part that can be retrofitted with a protrusion-shaped overlay,
Even in an existing internal combustion engine in which the intake surge tank does not have a protrusion-shaped build-up and in which the liquid substance easily flows in the intake surge tank, the same effect of preventing intrusion of the liquid substance as in the first aspect of the present invention can be obtained. .

According to the fourth aspect of the present invention, since the projection-shaped overlay is formed on a part of the gas filter body, the intake surge tank has no projection-shaped overlay, and the liquid substance is contained in the intake surge tank. Even in an existing internal combustion engine in which the gas easily flows, the same effect of preventing intrusion of a liquid substance as in the first aspect can be obtained. According to the invention described in claim 5, the gap between the inlet outer cylinder of the pressure extraction pipe and the projection-shaped overlay is 3 to 6 mm, and the height of the projection-shaped overlay is 15 to 15 mm.
Since the gap between the inlet outer cylinder of the pressure take-out pipe and the inner surface of the protruding build-up is 3 to 6 mm, the liquid substance is sufficiently prevented from intruding from the inlet outer pipe of the pressure take-out pipe beyond the gap. Is done. In addition, the height of the projection-shaped overlay is 15 to 17 mm, and the amount of water entering from the inlet outer cylinder of the pressure extraction pipe can be sufficiently reduced.

According to the sixth aspect of the present invention, since the position for installing the inlet outer cylinder of the pressure release pipe is provided in a region above the center line of the intake surge tank, the inner wall surface of the intake surge tank is connected. Since the flowing liquid material is unlikely to flow above the center line of the intake surge tank, the position for taking out the pressure, that is, the installation position of the inlet outer cylinder of the pressure take-out pipe is provided there, so that the effect of preventing intrusion of the liquid material is provided. Get nervous.

According to the invention described in claim 7, according to claim 1,
Since the protrusion-shaped overlay is provided at the position of claim 6 in the intake surge tank, the effect of preventing the intrusion of the liquid substance is further improved. According to the invention described in claim 8, the concave portion is provided in the region of the upper surface of the intake surge tank toward the outside of the intake surge tank, and the inner surface of the concave portion and the inlet outer cylinder of the pressure extraction pipe communicating with the concave portion are formed. Since a gap is provided between the recess and the recess, the recess faces upward and downward toward the outside of the intake surge tank, and the liquid material flowing along the inner wall surface of the intake surge tank flows down under the influence of gravity. Further, the gap between the inlet outer cylinder of the pressure extraction pipe and the inner surface of the recess prevents the liquid substance from intruding from the inlet outer cylinder of the pressure extraction pipe across the gap.

[0015]

FIG. 1 shows a first embodiment of the present invention. FIG.
1 shows a cross section of the entire pressure detecting device for detecting the pressure of 1 (however, the intake pipe pressure detector 10 is not a sectional view), and FIG. FIG. 2 is a perspective view of the entire apparatus (only the intake surge tank 1 has a cross section).

Hereinafter, a first embodiment of the present invention will be described with reference to FIG. The inside 101 of the intake surge tank 1 and the pressure detector 10 are provided with a metal filter 191 and a non-woven fabric filter 192 inside thereof, and an end of the gas filter 12 connected to the intake surge tank 1 by a screwing method or the like. The outer tube 180 of the pressure take-out pipe 18 protruding from the outer tube 180 communicates with the outer tube 180 through a pipe such as the rubber hose 11.

[0017] position the inlet outer cylinder 180 of the pressure take-out pipe 18 protrudes into the intake surge tank 1 inside 101 is an inlet outer cylinder 180 of the pressure take-out pipe 18 protruding to a height of h ₁ from the protruding portion. Here, h ₁ is 4 m
m. Then, so as to cover around it, it is provided with a padding 7 of height h ₂ in the inner wall surface of the intake surge tank 1.

Further, the inlet outer cylinder 18 of the pressure extraction pipe 18
A gap 9 having a certain distance e is provided between 0 and the inner surface of the overlay 7. The overlay 7 can be easily manufactured if a sand mold is formed so as to have the shape during the manufacturing process of the intake surge tank 1. As mentioned earlier, the intake surge tank 1
The inside 101 is filled with liquid substances such as water and oil, and these liquid substances are
It becomes a wall flow 17 on one wall surface and flows. At this time, if the overlay 7 is set up, most of the wall flow 17 is as shown in FIG.
As shown by an arrow 171 shown in FIG. 7B, the air does not directly enter the inlet outer cylinder 180 of the pressure extraction pipe 18 but flows around the overlay 7. Then, as shown in FIG. 1 (A), even if the wall surface flow 17 flows on the overlay 7 without bypassing the overlay 7, the inlet outer cylinder 1 of the overlay 7 and the pressure extraction pipe 18 may be used.
Since the gap 9 having a certain distance e is provided between the inner walls 80, the wall flow 17 can be prevented from directly entering the inlet outer cylinder 180 of the pressure extraction pipe 18 along the wall surface.

Here, the height h _{2 of the} overlay 7 and the gap 9 between the inlet outer cylinder 180 of the pressure extraction pipe 18 and the overlay 7 will be described. FIGS. 7A and 7B relate to a first experiment performed by the inventors. FIG. 7A is a perspective view of the entire configuration of a four-cylinder automobile engine 200 used as an experimental device, and FIG. It is a graph.

The present inventors conducted the following first experiment using a four-cylinder automobile engine 200 as shown in FIG. In order to detect the internal pressure of the intake surge tank, the inlet outer cylinder 180 of the pressure extraction pipe 18 formed on the end face of the gas filter 12 communicating with the intake pipe pressure detector 10 and the rubber hose 11 is connected to the intake surge tank 1. It was screwed into a mounting screw hole 20 drilled on the side and connected.

At this time, the position where the inlet outer cylinder 180 of the pressure extraction pipe 18 was set was a mounting screw hole 20 drilled at a side far from the throttle valve S and below the intake surge tank 1. And the intake surge tank 1
After water 22 is injected into the air cleaner 21 to create a wall flow therein, the four-cylinder automobile engine 200
Is operated to open and close the throttle valve S to promote gas exchange in a series of piping systems up to the intake pipe pressure detector 10. Thereafter, the operation of the four-cylinder automobile engine 200 is stopped, and the amount of water that has entered the inside of the gas filter 12 is determined before operation.
The weight difference after operation was measured.

At this time, the padding 7 has a height h ₂ and a gap 9.
Was made of clay or the like so as to be freely changed, and the experiment was performed while changing each of the four levels. As a result, as shown in FIG. 7B, the higher the height h _{2 of the} overlay 7, the smaller the amount of water that enters the inside of the gas filter 12. The larger the gap 9, the smaller the amount of water entering the gas filter 12, but the same result was obtained when the gap was 3 mm or more.

It is not preferable to make the height h ₂ of the padding 7 extremely large in consideration of making the flow inside the intake surge tank 101 smooth. And
The height h ₂ of the padding 7 as can be seen from the experiments 15 to 17
mm can sufficiently reduce water entering the gas filter 12. In addition, the gap e between the inlet outer cylinder 180 of the pressure extraction pipe 18 and the overlay 7 does not need to be extremely large, and as can be seen from the experiment, at most 3 to 6 mm.
If there is, the effect can be obtained sufficiently.

From the above, the height h ₂ of the overlay 7 is 15 to
17 mm may be sufficient, and the outer cylinder 180 of the pressure take-out pipe 18 may be used.
If the distance e of the gap 9 between the and the overlay 7 is 3 to 6 mm,
The amount of water that enters the inside of the inlet outer cylinder 180 of the pressure extraction pipe 18 can be extremely reduced. Next, the pressure release pipe 18
Surge tank 1 with mounting screw hole 20 that can further reduce the amount of wall flow 17 that enters the inside of outer cylinder 180 of inlet
A description will be given of an installation position of the device.

FIG. 8 relates to a second experiment conducted by the inventors and the like, and FIG. 8A is a perspective view of the overall configuration of a four-cylinder automobile engine 200 used as an experimental device.
(B) is a graph showing an experimental result. Fig. 8
As shown in (A), a four-cylinder automobile engine 200
And the following second experiment was performed.

In order to detect the internal pressure of the intake surge tank 1, the inlet outer cylinder 180 of the pressure extraction pipe 18 formed on the end face of the gas filter 12 communicating with the intake pipe pressure detector 10 and the rubber hose 11 is suctioned. Surge tank 1
It was screwed into the mounting screw hole drilled on the side of, and connected. At this time, the position where the inlet outer cylinder 180 of the pressure extraction pipe 18 is installed, that is, the mounting screw hole is located above the horizontal center line 4 where the horizontal plane including the center line of the intake surge tank 1 intersects the wall surface of the intake surge tank 1 Divided into lower parts, A, B, C on the upper side wall, D, E, F on the lower side wall, G on the opposite side of the throttle valve S, G,
H, I and J at the bottom. An experiment was performed by connecting a series of piping systems from the inlet outer cylinder 180 of the pressure extraction pipe 18 to the intake pipe pressure detector 10 in order from A to J at the ten locations. At that time, when performing an experiment at one place, the remaining nine places were plugged so as not to leak.

In the second experiment, as in the first experiment, a wall flow was created inside the intake surge tank 1.
After water 22 was injected into the air cleaner 21, the four-cylinder automobile engine 200 was operated, and the throttle valve S was opened and closed to promote gas exchange in a series of piping systems up to the intake pipe pressure detection device 10. Thereafter, the operation of the four-cylinder automobile engine 200 was stopped, and the amount of water that had entered the inside of the gas filter 12 was measured based on the weight difference before and after the operation.

FIG. 8B shows the result. According to the results of the second experiment, the gas filter 1 was located at four locations on the side walls A, B, C, and D and at one location on the wall G facing the throttle valve S.
2. The amount of water that enters 2 is small. Fig. 9 shows the intake surge tank 1
FIG. 4 is a partial cross-sectional perspective view showing a schematic diagram of a behavior of a wall flow 17 flowing through the inside.

From the results of the second experiment, the wall flow 17 inside the intake surge tank 1 flows from the throttle valve S toward the opposite surface side as shown by the arrow 3 in FIG. It is thought that there are few places. From the results of the second experiment, it can be said that the wall flow 17 is small at the upper position with the horizontal center line 4 of the intake surge tank 1 as a whole.

Although the above series of experiments was performed with water,
The same effect is obtained for another liquid substance, such as oil. FIG. 2 shows an inlet outer cylinder 180 of a pressure extraction pipe 18 formed on an end face of a gas filter 12 according to a second embodiment of the present invention.
It is a cross-sectional view along a central axis in the vicinity. In the second embodiment, the configuration of the gas filter 12 and the like communicating with the rubber hose 11 is the same as that of the first embodiment. Is built separately from the intake surge tank 1 so that the overlay 7 can be retrofitted. That is, in the case where there is a conventional internal combustion engine that does not have the above-mentioned protrusion-shaped build-up 7 and the liquid substance easily flows into the inner wall of the intake surge tank 1, the same gas filter 12 can be provided by attaching the protrusion-shaped build-up 7 later. The effect of preventing the wall flow 17 from entering the inlet outer cylinder 180 of the pressure extraction pipe 18 formed on the end face of the pipe can be obtained.

Here, the height h ₂ from the inner wall surface of the intake surge tank 1 to the tip of the projection-shaped overlay 7 may be 15 to 17 mm as in the first embodiment. The distance e of the gap 9 between the inner wall and the inlet / outer cylinder 180 of the pressure extraction pipe 18 formed on the end face of the gas filter 12 may be 3 to 6 mm as in the first embodiment. Further, the protrusion height h ₁ of the inlet barrel 180 is also comparable to the case of FIG.

The projection 7 is made of metal,
It may be made of resin, and its material does not matter. The installation method may be adhesion by an adhesive, press-fitting, or fastening by screws, and any installation method can be used as long as it can be fixed. FIG. 3 is a cross-sectional view of the pressure extraction pipe 18 formed on the end face of the gas filter 12 according to the third embodiment of the present invention along the central axis near the inlet outer cylinder 180 of the pressure extraction pipe 18. In the third embodiment, the rubber hose 1
The configuration up to 1 is the same as that of the first embodiment, but the projection-shaped overlay 7 itself is attached to the gas filter 12. Since the projection-shaped overlay 7 is attached to the gas filter 12, the liquid substance is easy to flow, and even in the intake surge tank 1 of the existing internal combustion engine without the projection-shaped overlay 7, the gas filter 12 is similarly attached. The effect of preventing the inflow of the wall flow 17 can be obtained.

Here, the height h ₂ from the wall surface of the intake surge tank 1 to the tip of the projection-shaped overlay 7 is set to 15 to 17 mm as in the first embodiment. The distance e of the gap 9 between the inner wall of the gas filter 12 and the inlet outer cylinder 18 of the gas filter 12 is also 3 to 6 m as in the first embodiment.
m. In addition, the protrusion-shaped overlay 7 may be made of metal or resin, and the material is not limited. The installation method may be adhesion or screw-in type.
It suffices if it is fixed at 2.

FIG. 4 is a view showing the vicinity of an inlet outer cylinder 180 of a pressure extraction pipe 18 formed on an end face of a gas filter 12 according to a fourth embodiment of the present invention.
2 is a cross-sectional view along the central axis of FIG. 2, and FIG. 2B is a view taken in the direction of arrow C in FIG. In the fourth embodiment, the protrusion-shaped overlay 7 is not disposed entirely around the inlet outer cylinder 180 of the gas filter 12, but is formed in an umbrella form only on the upper portion of the inlet outer cylinder 180 of the gas filter 12. This is provided with a buildup 7 having a shape. Since the wall flow 17 inside the intake surge tank 1 flows from the top to the bottom due to gravity in addition to the flow from the throttle valve S, a sufficient effect can be obtained even with this configuration.

FIG. 5 is a cross-sectional view along the center axis near the inlet outer cylinder 180 of the pressure extraction pipe 18 formed on the end face of the gas filter 12 according to the fifth embodiment of the present invention. In the fifth embodiment, the projection-shaped overlay 7 is installed inclining in the direction of gravity, and the effect is the same as in the first embodiment. Although the gap 9 between the inlet outer cylinder 180 of the gas filter 12 and the projection-shaped overlay 7 is the same as that of the first embodiment, even if the wall flow 17 flows into the gap, it is easily discharged. Incidentally, the inclination angle θ is desirably 20 to 45 °.

FIG. 6 is a cross-sectional view taken along the central axis near the inlet outer cylinder 180 of the pressure extraction pipe 18 formed on the end face of the gas filter 12 according to the sixth embodiment of the present invention. In the sixth embodiment, the recess 70 is provided facing the outside of the intake surge tank 1. The effects are the same as in the first embodiment. However, since the wall flow 17 inside the intake surge tank 1 flows from top to bottom due to gravity in addition to the flow from the throttle valve S, the wall flow 17 enters the gas filter 12 if it is provided on the side surface of the intake surge tank 1. Therefore, it is desirable to install it on the upper surface of the intake surge tank 1.

Here, the gap 9 of the length h ₂ from the inner wall surface of the intake surge tank 1 to the end of the recess 70 and the distance e between the inlet outer cylinder 180 of the gas filter 12 and the recess 70 are different from those of the first embodiment. Is the same.

[Brief description of the drawings]

FIG. 1 relates to a first embodiment of the present invention, and FIG. 1 (A) shows a partial cross section of the entire pressure detecting device for detecting a pressure inside an intake surge tank 1;
(B) is a partial cross-sectional perspective view of the entire pressure detecting device that detects the pressure inside the intake surge tank 1.

FIG. 2 is a cross-sectional view along a central axis near an inlet outer cylinder 180 of a pressure extraction pipe 18 formed on an end face of a gas filter 12 according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view along a central axis near an inlet outer cylinder 180 of a pressure extraction pipe 18 formed on an end face of a gas filter 12 according to a third embodiment of the present invention.

FIG. 4 is a view showing the vicinity of an inlet outer cylinder 180 of a pressure extraction pipe 18 formed on an end face of a gas filter 12 according to a fourth embodiment of the present invention, where (A) is a cross section along a central axis of the gas filter 12; It is a front view, (B) is an arrow C view in (A).

FIG. 5 is a cross-sectional view along a central axis near an inlet outer cylinder 180 of a pressure extraction pipe 18 formed on an end face of a gas filter 12 according to a fifth embodiment of the present invention.

FIG. 6 is a cross-sectional view along a central axis near an inlet outer cylinder 180 of a pressure extraction pipe 18 formed on an end face of a gas filter 12 according to a sixth embodiment of the present invention.

FIG. 7 relates to a first experiment conducted by the inventors, in which (A) is a perspective view of the entire configuration of a four-cylinder automobile engine 200 used as an experimental device, and (B) shows the experimental results. It is a graph shown.

FIGS. 8A and 8B relate to a second experiment performed by the inventors, and FIG. 8A is a perspective view of the entire configuration of a four-cylinder automobile engine 200 used as an experimental device, and FIG. It is a graph shown.

FIG. 9 is a partial sectional perspective view showing a schematic view of a behavior of a wall flow 17 flowing in the intake surge tank 1.

FIG. 10 is a perspective view of the entire internal combustion engine showing a state in which a conventional pressure detection device for an internal combustion engine is mounted.

FIG. 11 is a partial sectional perspective view of an intake surge tank portion and an air cleaner portion to which a conventional pressure detecting device is mounted.

FIG. 12 is a partial cross-sectional view along a central axis showing a conventional pressure detecting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake surge tank 7 Protrusion buildup 9 Gap 10 Intake pipe pressure detector 11 Rubber hose 12 Gas filter 18 Pressure extraction pipe 70 Depression 180 Inlet outer cylinder 200 Internal combustion engine S Throttle valve

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tokio Obama 14 Iwatani Shimowa Kakucho, Nishio City, Aichi Prefecture Inside the Japan Automotive Parts Research Institute (72) Inventor Seiko Watanabe 14 Iwatani Shimowa Kakucho Nishio City, Aichi Prefecture Shares (72) Inventor Kazuji Yamada 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Takashi Fukunaga 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F term (reference) 2F055 AA21 BB20 CC60 DD20 EE40 FF38 HH03 HH05 HH09 HH11

Claims (8)

[Claims] 1. An apparatus for detecting a pressure in an intake surge tank of an internal combustion engine, comprising: a pressure extraction pipe installed in communication with the interior of the intake surge tank; In the structure in which the pressure extraction pipe of the pressure detection device in the intake surge tank is communicated with, a gap is provided between the inlet outer cylinder of the pressure extraction pipe and the inner surface of the protruding build-up, and A pressure detecting device for an internal combustion engine, wherein the projection-shaped overlay is provided around a cylinder on the intake surge tank. 2. The internal combustion engine according to claim 1, wherein in the intake surge tank, the height of the projection-shaped overlay is set higher than the inlet outer cylinder of the pressure extraction pipe. Pressure detector. 3. The pressure detecting device for an internal combustion engine according to claim 1, wherein the component is formed separately from the intake surge tank as a component to which the protrusion-shaped overlay can be retrofitted. 4. A gas filter is provided so as to communicate between the intake pipe pressure detector and the inside of the intake surge tank,
2. A pressure detecting device for an internal combustion engine according to claim 1, wherein said projection-shaped buildup is formed in a part of said gas filter main body. 5. The gap between the inlet outer cylinder of the pressure extraction pipe and the projection-shaped overlay is 3 to 6 mm, and the height of the projection-shaped overlay is 15 to 17 mm. Item 2. A pressure detecting device for an internal combustion engine according to item 1. 6. A pressure detecting device for an internal combustion engine, wherein a position for installing an inlet outer cylinder of a pressure extraction pipe is provided in a region above a center line of an intake surge tank. 7. The pressure detecting device for an internal combustion engine according to claim 1, wherein the projection-shaped overlay is provided at the position shown in claim 6. 8. An apparatus for detecting a pressure in an intake surge tank of an internal combustion engine, comprising: a pressure extraction pipe installed so as to communicate with the interior of the intake surge tank; In the structure in which the pressure extraction pipe of the suction surge tank internal pressure detection device is communicated with, the recess is provided in the area of the upper surface of the suction surge tank toward the outside of the suction surge tank, and the recess is provided in the recess. A pressure detecting device for an internal combustion engine, wherein a gap is provided between an inlet outer cylinder of the pressure extraction pipe communicating with the inner wall of the recess.