JPH01173407U

JPH01173407U -

Info

Publication number: JPH01173407U
Application number: JP6869588U
Authority: JP
Priority date: 1988-05-26
Filing date: 1988-05-26
Publication date: 1989-12-08

Description

[Brief explanation of the drawing]

第１図は本考案の排気音干渉型消音装置の概略
構造図であり、第２図はそのテールパイプに干渉
音を発生させる管長可変テールパイプが並設され
た部分構成図であつて、Ａはアクチユエータが作
動されない管長可変テールパイプの状態図、Ｂは
アクチユエータが作動して管長可変テールパイプ
の管長を変化させた状態図である。第３図は排気
音の任意周波数に対する干渉音の発生形態図を示
し、Ａは排気音エネルギーが一番高い周波数の形
態図、Ｂは排気音の任意周波数の変化する音圧、
又は他の周波数の音圧を消音する場合の形態図で
ある。第４図は本考案の他の実施例による管長可
変テールパイプを曲管テールパイプに変更し、テ
ールパイプに並設した構造部分図である。第５図
は従来の干渉型消音原理説明図である。１……マフラ、２……エンジン、３……直管テ
ールパイプ、４……管長可変テールパイプ、５…
…アクチユエータ、６……アクチユエータ制御機
能手段。 FIG. 1 is a schematic structural diagram of the exhaust sound interference type muffler of the present invention, and FIG. 2 is a partial configuration diagram in which a tail pipe with a variable length that generates interference noise is arranged in parallel with the tail pipe, and FIG. B is a state diagram of the variable length tailpipe in which the actuator is not operated, and B is a state diagram in which the actuator is operated to change the length of the variable length tailpipe. Figure 3 shows a diagram of the generation form of interference sound for an arbitrary frequency of exhaust sound, A is a diagram of the form of the frequency where the exhaust sound energy is the highest, B is a diagram of the changing sound pressure of an arbitrary frequency of exhaust sound,
It is a form diagram in the case of muting the sound pressure of another frequency. FIG. 4 is a structural partial view of a variable-length tail pipe according to another embodiment of the present invention, which is changed to a curved tail pipe and arranged in parallel with the tail pipe. FIG. 5 is an explanatory diagram of the conventional interference type noise reduction principle. 1...Muffler, 2...Engine, 3...Straight tail pipe, 4...Variable length tail pipe, 5...
... Actuator, 6... Actuator control function means.

Claims

[Scope of utility model registration request]

A muffler that muffles the exhaust noise emitted from an engine is configured with two tail pipes that guide exhaust gas from the muffler into the atmosphere. One of the tail pipes is a variable length tail pipe; is equipped with an actuator that can change the length of the pipe, and the actuator is activated by the sound pressure of the exhaust sound coming from the other straight tail pipe.
An actuator control function means is provided to generate an interference sound with a sound pressure that is 0 degrees out of phase, and the interference sound is changed under the control of the actuator control function means, so that the exhaust sound has a wide range of frequencies. An exhaust sound interference type muffling device that is characterized by being muffled across the entire range.