JPH063180Y2 - Internal combustion engine intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to an intake device for purifying air supplied to an internal combustion engine, and more particularly to an intake device made of synthetic resin.

《Prior art》 In recent years, for vehicles, due to weight reduction and ease of molding,
An intake system of an internal combustion engine formed of synthetic resin is often used.

Such an intake device is provided with an air cleaner, and purified air for an internal combustion engine is obtained by passing air through the air cleaner and filtering the air.

In addition, there is a type of internal combustion engine of recent years that is provided with a fuel injection valve and electronically controls the air-fuel ratio, but in this so-called EGI internal combustion engine, the intake air amount is detected as one control element.

Therefore, conventionally, an air flow sensor is provided in the duct connecting the air cleaner and the internal combustion engine to measure the passing air amount, but there are various kinds of such air flow sensors at present, and some of them are of the hot wire type. .

The hot wire type air flow sensor reads a change in resistance value of a hot wire that is cooled according to the amount of passing air, and is constantly heated.

However, the intake device having such a structure has the problems described below.

<Problems to be solved by the invention> In other words, dust in the air drawn into the air cleaner is charged with a small amount of static electricity, but the case and duct of the air cleaner are made of synthetic resin. , When the charged dust passes with the intake air, it comes in contact with them and the amount of charge increases due to friction,
If the charged fine dust is not captured and mixed into the purified air, when passing through the air flow sensor,
This may adhere to the heat rays.

Then, the performance of the air flow sensor deteriorates and causes a malfunction, which causes a problem that the air-fuel ratio becomes lean or overrich.

Therefore, an object of the present invention is to provide an intake device for an internal combustion engine that can prevent the performance of the airflow sensor from being deteriorated by discharging and removing the static electricity charged in the dust.

<Means for Solving Problems> In order to achieve such an object, the present invention provides a synthetic resin intake device in which a hot-wire air flow sensor is provided in a purified air supply passage from an air cleaner to an internal combustion engine. The filter paper of the filter element constituting the air cleaner is characterized in that conductive fibers are woven therein.

<< Operation >> In the intake device for the internal combustion engine of the present embodiment having the above-described configuration, when the intake air flows through the air cleaner, the charged dust in the intake air contacts the conductive fibers woven in the filter paper of the filter element. It is possible to remove the static electricity that is discharged due to and is charged by the dust.

Therefore, even if dust passes through the air cleaner, the dust that has passed is no longer charged with static electricity, so that the performance of the air flow sensor can be maintained.

<< Embodiment >> An embodiment of the present invention will be described in detail below with reference to the drawings.

That is, FIG. 1 shows an intake device 10 for an internal combustion engine showing an embodiment of the present invention, in which 12 is an air cleaner, 14 is an air introducing duct, and 16 is a purified air supply duct. The introduction duct 14 is provided with a resonator 18.

The air cleaner 12 is sandwiched between a cleaner case 22 including an upper case 22a and a lower case 22b, which are joined together via a hook 20, and the cleaner case 22 sandwiched between the upper case 22a and the lower case 22b. The air intake 26 formed in the lower case 22b is connected to the introduction duct 14 via a rubber hose 28 and the air exhaust formed in the upper case 22a. The supply duct 16 is connected to the outlet 30 via a rubber hose 32.

Further, the rubber hose 32 on the air discharge side has a heating wire 34
An air flow sensor 34 having a is provided.

Then, the air introduced into the lower case 22b of the air cleaner 12 through the introduction duct 14 passes through the filter element 24 and is filtered, and the filtered purified air is supplied from the upper case 22a to the air flow sensor 34 and the supply duct 16. Is supplied to the engine (not shown) via the.

The passing amount of the purified air at this time is detected by the heating wire 34a of the air flow sensor 34.

Here, in the present embodiment, the filter paper of the filter element 24 is woven with conductive fibers, for example, carbon fibers, as a static electricity removing body, and further, the upper case 22a is used.
Also, the lower case 22b is formed of a conductive resin, and the cleaner case 22 itself also serves as a static electricity remover.

The introduction duct 14 and the supply duct 16 are formed of ordinary synthetic resin or the like.

In the intake device 10 of the present embodiment having the above configuration,
When air is taken in through the introduction duct 14, the air cleaner 12 and the supply duct 16 with the operation of the engine, the air is woven into the filter paper of the lower case 22b and the filter element 24 when passing through the air cleaner 12. It contacts the carbon fiber and the upper case 22a.

At this time, the static electricity charged in the duct mixed in the intake air is generated by the cases 22a and 22b and the filter element 2.
When the carbon fibers woven into the filter paper of No. 4 are contacted with the carbon fibers woven into the filter paper of the cases 22a and 22b and the filter element 24, the carbon fibers woven into the filter paper are formed of an electrically conductive material. Are discharged to the carbon fibers of the cases 22a and 22b and the filter element 24, which are woven into the filter paper.

Therefore, even if fine dust is mixed into the purified air and is supplied to the engine side without being captured by the air cleaner 12, the dust is prevented from being charged with static electricity, so that the dust is prevented from adhering to the heating wire 34a.

As a result, the surface of the heating wire 34a can be prevented or significantly reduced from being covered with dust.
The normal operation of No. 4 can be maintained and the set air-fuel ratio state can be always maintained.

In this way, since the carbon fibers are woven into the filter paper of the filter element 24, all the dust mixed in the intake air comes into contact with the carbon fibers due to the woven amount, and a high static electricity removing effect is obtained.

<Effects of the Invention> As described above, in the intake device for the internal combustion engine of the present invention, the charged dust in the intake air comes into contact with the conductive fibers woven in the filter paper of the filter element, so that a simple structure is achieved. However, the static electricity of the charged dust mixed in the intake air can be removed.

Therefore, even if dust is mixed in the purified air supplied from the air cleaner, it is possible to prevent the dust from adhering to the hot wire air flow sensor, accurately detecting the intake air amount, and determining the air-fuel ratio of the engine. It has an excellent effect of being able to maintain the set value.

[Brief description of drawings]

 FIG. 1 is a sectional view showing an embodiment of the present invention. 10 ... Intake device, 12 ... Air cleaner 22 ... Cleaner case, 22a ... Upper case 22b ... Lower case 24 ... Filter element 34 ... Air flow sensor, 34a ... Heat wire

Claims (1)

[Scope of utility model registration request] 1. In a synthetic resin intake device having a hot-wire air flow sensor in a supply passage of purified air from an air cleaner to an internal combustion engine, the filter paper of the filter element constituting the air cleaner is made of a conductive fiber. An intake device for an internal combustion engine, characterized by being woven.