JP2017166378A - Air cleaner of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaner of an internal combustion engine which attains high sound absorption effect for suction noise.SOLUTION: An air cleaner 10 of an internal combustion engine includes: an air cleaner element 13 which filters air; an air cleaner case 11 which houses the air cleaner element 13; and an inlet duct 21 which introduces air into the air cleaner case 11. The inlet duct 21 has an extension part 22 extending into the air cleaner case 11. A communication hole 25 penetrating through the extension part 22 is provided at the extension part 22 and enables communication between the interior and the exterior of the extension part 22. A sound absorption material 30 covering the communication hole 25 is attached to the extension part 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an air cleaner for an internal combustion engine in which intake air is introduced into an air cleaner case via an inlet duct.

  An air cleaner for an internal combustion engine described in Patent Document 1 is filled in an inlet duct connected to an air cleaner case, a bulging portion in which a part of the outer wall of the inlet duct is bulged to the outside, and the inside of the bulging portion. A sound absorbing material and a plate with a communication hole provided along the inner surface of the sound absorbing material are provided. And the vibration of air is guided to the sound absorbing material through the communication hole provided in the plate, and the intake sound is reduced.

JP-A-4-318269

Thus, although the sound absorption effect can be obtained even by the air cleaner of the internal combustion engine described in Patent Document 1, in recent years, further improvement in quietness has been demanded, and there is room for improvement in this respect.
The present invention has been made in view of the above circumstances, and an object thereof is to provide an air cleaner for an internal combustion engine that can obtain a high sound absorption effect with respect to intake sound.

  An air cleaner for an internal combustion engine for solving the above problems includes an air cleaner element that filters air, an air cleaner case that accommodates the air cleaner element, and an inlet duct that introduces air into the air cleaner case. In the air cleaner of the internal combustion engine, the inlet duct has an extending portion that extends to the inside of the air cleaner case. The extending portion penetrates the extending portion and extends in the air cleaner case. A communication hole that communicates the inside and the outside of the protruding portion and a sound absorbing material that covers the communication hole are provided.

  According to the said structure, the vibration of the air which becomes a cause of inhalation sound is reduced by passing a sound-absorbing material via the communicating hole provided in the extension part. The vibration of the air that has passed through the sound absorbing material is reflected by the wall surface of the air cleaner case and passes through the sound absorbing material again. Thus, the vibration of the air is reduced again by passing through the sound absorbing material again. Thus, both when passing the sound absorbing material from the inside of the extending portion toward the outside of the extending portion and when passing the sound absorbing material from the outside of the extending portion toward the inside of the extending portion. Since the effect of reducing the intake sound by the sound absorbing material can be obtained, a high sound absorption effect can be obtained for the intake sound.

The top view which shows one Embodiment of the air cleaner of an internal combustion engine. FIG. 2 is a sectional view taken along line 2-2 of FIG.

Hereinafter, an embodiment of an air cleaner for an internal combustion engine will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the air cleaner 10 of the internal combustion engine includes an air cleaner case 11 and an inlet duct 21 connected to the air cleaner case 11.

  As shown in FIG. 2, an air cleaner element 13 that filters impurities such as dust contained in the air is accommodated in the air cleaner case 11. A discharge port 14 is formed integrally with the outer wall 12 of the air cleaner case 11, and the air cleaner case 11 communicates with the intake passage of the internal combustion engine through the discharge port 14.

  The inlet duct 21 extends to the inside of the air cleaner case 11, and the opening 21 a is located inside the air cleaner case 11. In the inlet duct 21, a communication hole 25 that penetrates the outer wall 23 that forms the extension part 22 is formed in the extension part 22 that is a part located inside the air cleaner case 11. A plurality of communication holes 25 are formed along the circumferential direction and the axial direction of the extending portion 22. The communication hole 25 communicates the inside and the outside of the extension 22. Further, the sound absorbing material 30 is fitted into the extending portion 22 from the outside. Thereby, the communication hole 25 is covered from the outside by the sound absorbing material 30. The sound absorbing material 30 is a porous material made of, for example, urethane or a fiber material.

Next, the effect | action of this embodiment and the effect acquired by the effect | action are demonstrated.
The air introduced into the air cleaner case 11 through the inlet duct 21 flows through the air cleaner case 11, passes through the air cleaner element 13, and flows into the intake passage through the discharge port 14. Then, air is introduced from the intake passage into the combustion chamber of the internal combustion engine.

  In the air cleaner 10 of the internal combustion engine of the present embodiment, the vibration of the air that causes the intake noise is transmitted from the inside of the extension portion 22 to the outside of the extension portion 22 through the communication hole 25. 30 through which air vibrations are reduced. Since the air cleaner case 11 has no portion communicating with the outside other than the inlet duct 21 and the discharge port 14, the vibration of the air leaking from the extending portion 22 tends to stay in the air cleaner case 11. 11 is difficult to leak out. The vibration of the air leaking from the extending portion 22 into the air cleaner case 11 is reflected by the wall surface 12 a of the outer wall 12 of the air cleaner case 11, passes through the sound absorbing material 30 again, and extends through the communication hole 25. From the outside of the part 22 toward the inside of the extension part 22. At this time, the vibration of the air is reduced again by passing through the sound absorbing material 30.

  As described above, when the vibration of the air passes through the sound absorbing material 30 from the inside of the extending portion 22 toward the outside of the extending portion 22, the air vibration is directed from the outside of the extending portion 22 to the inside of the extending portion 22. Thus, the effect of reducing the intake noise by the sound absorbing material 30 can be obtained both when the sound absorbing material 30 is passed. For this reason, according to the air cleaner 10 of the internal combustion engine of the present embodiment, a high sound absorption effect can be obtained with respect to the intake sound.

Moreover, according to the air cleaner 10 of the internal combustion engine, the following effects can also be achieved.
In the inlet duct 21, the effect of reducing the intake noise by the sound absorbing material 30 is expected as the portion where the vibration of air passes through the sound absorbing material, that is, the range in which the sound absorbing material 30 covering the communication hole 25 and the communication hole 25 is provided is wider. it can. However, outside the air cleaner case 11, the inlet duct 21 may be curved due to space, and the portion where the communication hole 25 and the sound absorbing material 30 can be disposed may be limited. In the present embodiment, the inlet duct 21 is extended to the inside of the air cleaner case 11, and the communication hole 25 and the sound absorbing material 30 are provided in the extended portion 22. For this reason, even if there is no sufficient space outside the air cleaner case 11, the communication hole 25 and the sound absorbing material 30 can be disposed over a wide range of the inlet duct 21.

It should be noted that the above-described embodiment can be implemented with the following modifications.
The sound absorbing material 30 may cover the communication hole 25 from the inside of the extension part 22. Moreover, the arrangement | positioning aspect of the sound-absorbing material 30 should just be an aspect which covers the communicating hole 25, and is not restricted to the aspect fitted by the extension part 22. FIG. For example, one sound absorbing material may be fixed to each of the plurality of communication holes 25 so as to cover the communication holes 25.

  DESCRIPTION OF SYMBOLS 10 ... Air cleaner of internal combustion engine, 11 ... Air cleaner case, 13 ... Air cleaner element, 21 ... Inlet duct, 22 ... Extension part, 25 ... Communication hole, 30 ... Sound absorbing material.

Claims (1)

An air cleaner element for filtering air;
An air cleaner case that houses the air cleaner element;
An air cleaner for an internal combustion engine comprising an inlet duct for introducing air into the air cleaner case,
The inlet duct has an extending portion extending to the inside of the air cleaner case,
The extension part is provided with a communication hole that penetrates the extension part and communicates the inside and the outside of the extension part in the air cleaner case, and a sound absorbing material that covers the communication hole. An air cleaner for an internal combustion engine.

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