JPH0411207U

JPH0411207U -

Info

Publication number: JPH0411207U
Application number: JP5067390U
Authority: JP
Priority date: 1990-05-15
Filing date: 1990-05-15
Publication date: 1992-01-30

Description

[Brief explanation of the drawing]

第１図は本考案第１実施例の断面図、第２図は
キヤンセル用音源の断面図、第３図は第２実施例
の断面図、第４図は第２実施例のパツシブラジエ
ータの断面図、第５図は同パツシブラジエータの
変形例の断面図、第６図は従来例の構成を示す説
明図である。１はキヤンセル用音源、２は排気管、３は騒音
打消し制御手段、４はセンサーマイクロホンであ
る。 Fig. 1 is a sectional view of the first embodiment of the present invention, Fig. 2 is a sectional view of a canceling sound source, Fig. 3 is a sectional view of the second embodiment, and Fig. 4 is a sectional view of the passive radiator of the second embodiment. 5 is a sectional view of a modified example of the same passive radiator, and FIG. 6 is an explanatory diagram showing the configuration of a conventional example. 1 is a canceling sound source, 2 is an exhaust pipe, 3 is a noise cancellation control means, and 4 is a sensor microphone.

Claims

[Claims for Utility Model Registration] 1. An exhaust pipe 2 whose one end is connected to the engine, a canceling sound source 1 arranged to be able to emit pressure waves into the exhaust pipe, and noise within the exhaust pipe 2. and a noise canceling control means 3 for monitoring with a sensor microphone 4 and inputting a predetermined control signal to the canceling sound source 1, and canceling the noise in the exhaust pipe 2 by the output pressure wave of the canceling sound source 1. In an electric silencer for an internal combustion engine,
The cancel sound source 1 is surrounded by a cavity 1c provided in the middle of the exhaust pipe 2, and a passive radiator 1a and cavity 1c made of a flexible heat-resistant material and attached to the opening of the cavity 1c. The passive radiator 1a
and a driver 1b attached to a cavity 1c so as to radiate sound waves into the space behind the engine. 2 An exhaust pipe 2 whose one end is connected to the engine, a canceling sound source 1 arranged to be able to emit pressure waves into the exhaust pipe, and a sensor microphone 4 that monitors the noise inside the exhaust pipe 2. An electric silencer for an internal combustion engine, which has a noise canceling control means 3 that inputs a predetermined control signal to a canceling sound source 1, and cancels and muffles the noise in an exhaust pipe 2 by the output pressure wave of the canceling sound source 1. In the
A passive radiator in which the canceling sound source 1 is made of a flexible heat-resistant material and has a tubular structure that is expandable and contractible in the circumferential direction, communicating with an exhaust pipe 2 and surrounding an exhaust gas flow path. 1a, a cavity 1c provided in the middle of the exhaust pipe 2 to cover the passive radiator 1a, and a cavity 1 so as to radiate sound waves into the space surrounding the passive radiator 1a surrounded by the cavity 1c.
An electric muffling device for an internal combustion engine, characterized in that it consists of a driver 1b attached to a driver 1b. 3. The electric silencer for an internal combustion engine according to claim 1, wherein the flexible heat-resistant material constituting the passive radiator 1a of the canceling sound source 1 is silicone rubber.