JP2594155Y2 - Engine intake silencer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake silencer for an engine in which a resonance chamber is mounted in an intake passage of the engine to reduce intake noise.

[0002]

2. Description of the Related Art Noise generated from an automobile is obtained by overlapping noises from different sources in an automobile body. One of the sources is intake noise generated from an intake system of an engine.

[0003] The above intake noise is affected by the engine speed and the shape of the intake pipe, and is mainly composed of low frequency noise. Such a low-frequency intake noise reduction measure can be performed using a sound insulating plate or a sound absorbing material that is effective as a high-frequency noise reduction measure. On the other hand, mounting such a sound insulating plate or a sound absorbing material on a vehicle body increases the weight of the entire vehicle body and increases the cost.

On the other hand, there is a type in which a resonance type silencer is connected to an intake passage to reduce intake noise. However, this intake silencer silences at a specific frequency. However, the actual festival had the following technical issues.

[0005]

That is, the intake noise of the engine is generated at different frequencies depending on the rotation speed of the engine. On the other hand, the conventional intake silencer as described above resonates with the volume in the cavity chamber by the suction negative pressure to resonate the intake noise frequency when the sound pressure level of the intake noise is maximized, thereby reducing the noise. However, the sound pressure level of the intake noise in a frequency region other than the intake noise frequency cannot be reduced.

In order to reduce intake noise in a plurality of frequency ranges, it is conceivable to provide a large number of intake silencers. However, the layout of installation is difficult and the cost is high.

This invention is intended to solve the above problems, and to provide an intake silencer for an engine which can reduce the cost and reduce each intake noise in a low frequency range and a high frequency range simultaneously. With the goal.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a resonance type intake silencer provided in an intake passage of an engine, wherein the plurality of intake silencers communicate with the intake passage through a communication passage. The hollow chambers are arranged in parallel, these hollow chambers are connected to each other by a communication pipe, and an open / close valve is provided in each of the communication path and the communication pipe, and these open / close valves are opened / closed according to the engine speed. And the degree of opening and closing of the on-off valve is changed according to the number of revolutions of the engine.

[0009]

With this configuration, the opening degree of the valve is changed so as to resonate with the frequency at which each sound pressure level in the high frequency range and the low frequency range of the intake noise corresponding to the engine speed is maximized. Can be changed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of an intake silencer of an engine according to an embodiment of the present invention. In FIG. 1, 1
An intake passage connects an air cleaner (not shown) and an intake port of the engine. A communication pipe 3 communicating with the first hollow chamber 2 is connected to the intake passage 1, and a communication pipe 5 communicating with the second hollow chamber 4 is connected to the first hollow chamber 2. A resonance type silencer is configured by connecting a communication pipe 6 that connects the second cavity chamber 4 and the intake passage 1 to each other.

Opening / closing valves 7, 8, and 9 are installed in the communication pipes 3, 5, and 6, respectively. The opening and closing valves 7, 8, and 9 are operated by an actuator 10 that operates according to the engine speed.
Opening and closing of 8, 9 are performed, and the opening areas of the communication pipes 3, 5, 6 are changed.

In the intake silencer having the above structure, the resonance effect shown in FIG. 2A is obtained by the resonance of the first cavity chamber 2 when the open / close valve 7 is opened and the open / close valves 8, 9 are closed. In the state where 7 and 9 are open and the on-off valve 8 is closed, the resonance effect shown in FIG. 2B is obtained by the resonance of the first cavity 2 and the second cavity 4 which is different from that of the first cavity 2. . The resonance effect shown in FIG. 2C in which the resonance of the first cavity 2 and the resonance of the second cavity 4 are combined by the opening / closing degree of the opening / closing valves 7, 8, 9 is obtained. The resonance frequency can be changed by changing the opening / closing degree of the opening / closing valve. The opening / closing degree of the opening / closing valves 7, 8, and 9 is changed by the actuator 10 that operates according to the engine speed, and the difference generated by the engine speed. Can be silenced in response to the intake noise of a different frequency.

[0013]

As described in detail in the above embodiments, in the intake silencer of the engine according to the present invention, each open / close valve provided in the communication pipe connecting each of the intake passage and the plurality of hollow chambers is provided. It opens and closes according to the engine speed, changes the resonance area of one cavity chamber, the resonance of the one cavity chamber and the other cavity chamber, changes the opening area of the communication pipe, changes the expansion ratio of multiple cavity chambers To make
It is possible to resonate in response to intake noise of different frequencies generated according to the engine speed, and thus intake noise of a wide range of frequencies can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram of a muffling effect for the same frequency.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake passage 2 First cavity chamber 3, 5, 6 Connecting pipe 4 Second cavity chamber 7, 8, 9 Opening / closing valve 10 Actuator

Claims (1)

(57) [Scope of request for utility model registration] 1. A resonance type intake silencer provided in an intake passage of an engine, wherein a plurality of cavity chambers communicating with the intake passage via a communication passage are arranged in parallel, and these cavity chambers are communicated with each other. Opening and closing valves are provided in each of the communication passages and the communication pipes, and these opening and closing valves are connected to actuators that are opened and closed in accordance with the number of engine revolutions. An intake silencer for an engine, which varies according to the number.