JPH0752377Y2 - Intake pressure detection device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a device for detecting intake pressure in an intake manifold of an internal combustion engine.

[Conventional technology]

In recent internal combustion engines, the intake pressure in the intake manifold is detected and the fuel injection amount is controlled according to the intake pressure, or the exhaust gas recirculation to the intake system is controlled. , There is pulsation in the intake manifold, and due to this pulsation, fuel oil and water in the intake manifold enter the pressure sensor through the pressure transmission conduit from the inside of the intake manifold to the pressure sensor. An error will occur in the detection of the intake pressure in the pressure sensor.

Therefore, conventionally, for example, as described in JP-A-58-66034, by providing a space chamber in the middle of the pressure transmission passage from the intake manifold to the pressure sensor, the inside of the intake manifold is reduced. It is designed to prevent or reduce the entry of fuel oil and water into the pressure sensor.

[Problems to be solved by the device]

However, in this way, providing a space chamber in the middle of the pressure transmission passage from the intake manifold to the pressure sensor is
This not only increases the number of parts, but also increases the number of steps required for assembly, which leads to a significant increase in cost. Moreover, since it is necessary to secure a space for providing the space chamber, the size is increased. Was also invited.

SUMMARY OF THE INVENTION The present invention relates to an internal combustion engine of recent years, which has an inertial supercharging type including an intake manifold including a chamber with a cover plate and a plurality of branch intake pipe lines independently extending from the chamber toward each cylinder. Focusing on the fact that an intake manifold is used, it is a technical problem to solve the above-mentioned conventional problems by utilizing the chamber in this inertia supercharged intake manifold without impairing the castability of the intake manifold. It is what

[Means for Solving the Problems]

In order to achieve this technical problem, the present invention provides an intake manifold that distributes intake air from an air cleaner to each cylinder, and a plurality of branches that extend independently from the chamber having an open upper surface and each chamber toward each cylinder. In an internal combustion engine comprising an intake pipe line and a cover plate attached to the chamber so as to close an upper surface opening portion of the chamber, the interior of the chamber is provided with a small hole inside the chamber. A space chamber communicating with the chamber is integrally formed so that the space chamber opens to the joint surface of the lid plate with respect to the chamber, and a pressure sensor is connected to the space chamber via a pressure transmission passage, while the chamber is connected to the chamber. The lid plate is configured to close the opening of the space chamber.

[Function and effect of device]

According to this structure, the space chamber for preventing or reducing the fuel oil in the intake manifold from entering the pressure sensor can be integrally formed in the chamber in the intake manifold. It is possible to avoid an increase in the number of assembling steps and an increase in the outer size of the chamber and an increase in space.

On the other hand, the space chamber is integrally formed inside the chamber so that the space chamber opens to a joint surface for the chamber, and the opening of the space chamber is closed by a cover plate for the chamber. By configuring
Since the chamber is integrally formed with the space chamber, it is not necessary to locally increase the wall thickness in the chamber, so that the castability of the intake manifold is not impaired.

Moreover, in the present invention, since the space chamber is formed inside the chamber in the intake manifold, the inner volume of the space chamber can be increased without increasing the outer dimension of the chamber and the space. Therefore, it is possible to further improve the certainty of preventing or reducing the intrusion of fuel oil and water into the pressure sensor.

〔Example〕

An embodiment of the present invention will now be described with reference to the drawings. In the drawings, reference numeral 1 indicates a first cylinder A ₁ , a second cylinder A ₂ , and a third cylinder A _3.
And fourth cylinder A shows a four-cylinder internal combustion engine having _four in the longitudinal side surface 2a of the cylinder head 2 of the internal combustion engine 1, the respective cylinders A _1, A _2, A _3, A ₄ in the intake port 3, 4, 5 and 6 are open.

Reference numeral 7 indicates an inertial supercharging type intake manifold for the internal combustion engine 1, and the intake manifold 7 is arranged on a side of the internal combustion engine 1 so as to extend in the direction of the cylinder array and to open an upper chamber 8 And four branch intake pipe lines 9, 10, 11, 12 respectively connecting the chamber 8 and the intake ports 3, 4, 5, 6 independently of each other. The branch intake pipe lines 9, 10, 11, 12 are curved in a substantially L shape in a side view.

The intake manifold 7 is manufactured by casting a metal material such as an aluminum alloy, and the upper surface of the chamber 8 is
A lid plate 13 for closing the opening on the upper surface of the chamber 8 is attached by a plurality of bolts 14. Further, between the upper surface of the chamber 8 and the lid plate 13,
A gasket 22 for sealing is inserted, and furthermore, at one end of the chamber 8, an inlet 8a for intake air from an air cleaner (not shown) is provided.

Then, the chamber 8 in the intake manifold 7
The partition plate 15 is integrally formed at an appropriate position such as a corner of the interior of the partition wall 15 to form the interior of the partition plate 15 into a space chamber 16 opening to the upper surface of the chamber 8. The space chamber 16 is configured to be closed by the lid plate 13 for the chamber 8, while the partition plate 15 is provided with a small hole 17 that communicates the space chamber 16 with the inside of the chamber 8.

Further, on the side surface of the chamber 8, a female screw hole 18 is formed at a portion corresponding to the space chamber 16, and the female screw hole 18 is formed.
Connect the air filter 19 screwed to the, and connect the hose for pressure transmission between the air filter 19 and the pressure sensor 20.
Connect via 21.

When the female screw hole 18 is bored, the small hole 17 may be simultaneously bored in a portion on the axis of the female screw hole 18, but as shown by a chain double-dashed line in FIG. In addition, the chamber 8 may be configured so as to be bored from the opening with respect to the upper surface.

According to this structure, the inside of the chamber 8 and the pressure sensor 20 communicate with each other through the space chamber 16 and the pressure transmitting hose 21, so that the intake pressure in the chamber 8 is transmitted to the pressure sensor 20. Meanwhile, chamber 8
The presence of the space chamber 16 can prevent or reduce entry of fuel oil, water, and the like in the pressure sensor 20 into the pressure sensor 20.

[Brief description of drawings]

1 is a plan view, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1 ...... internal combustion _{engine, A 1, A 2, A} 3, A 4 ...... cylinder, 3, 4, 5, 6 ...
… Intake port, 7 …… Intake manifold, 8 …… Chamber, 9,10,11,12 …… Branch intake duct, 13 …… Cover plate, 15…
… Partition plate, 16… Space room, 17… Small hole, 18… Female screw hole, 19… Air filter, 20… Pressure sensor, 21…
Pressure transmission hose.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G01L 23/24 F02M 35/10 301 C 301 T 301 R

Claims (1)

[Scope of utility model registration request] 1. An intake manifold for distributing intake air from an air cleaner to each cylinder, comprising an open-top chamber and a plurality of branch intake pipe lines independently extending from the chamber toward each cylinder. Further, in the internal combustion engine configured by attaching a cover plate to the chamber so as to close the upper surface opening portion of the chamber, in the interior of the chamber, a space chamber communicating with the chamber through a small hole, The space chamber is integrally formed so as to open at the joint surface of the cover plate with respect to the chamber, and the pressure sensor is connected to the space chamber via the pressure transmission passage, while the cover plate for the chamber allows the space An intake pressure detection device in an internal combustion engine, characterized in that it is configured to close an opening of a chamber.