Sub-muffler

Abstract

Provided is a sub-muffler which needs no heat resistant material such as SUS, and which can keep its durability and sound absorbing performance even when the sub-muffler is exposed to various corrosive components in the exhaust gas. At the same time, accomplished is a low-cost manufacture, which is a challenge that sub-mufflers and sound absorbing materials commonly face. Disclosed is a sub-muffler in which a perforated exhaust pipe is arranged, and caps and an out pipe are arranged outside the perforated pipe. Sound absorbing materials are filled in the space between the perforated exhaust pipe, and the caps and the out pipe. The sub-muffler is characterized in that, among the sound absorbing materials, at least part of the sound absorbing material of the perforated pipe side is a basalt fiber for high temperature.

Description

Second muffler technical field The present invention relates to a sub-muffler (sub-muffler) using basalt fiber. As a sound-absorbing material, the basalt fiber has excellent sound-absorbing performance and excellent heat resistance. Background technique Automobile mufflers are used as components to absorb exhaust noise. Fiberglass is currently used as the sound-absorbing material for mufflers. Recently, the need for energy saving and stricter control of exhaust emissions have brought about an increase in the temperature of automobile engines, which is accompanied by an increase in the exhaust temperature at the muffler section to over 800°C. For this reason, there is an urgent need to develop a sound absorbing material for mufflers with higher heat resistance (capable of withstanding temperatures from 750°C to 900°C). For example, exposure to high temperature (up to 800°C) gases discharged from the exhaust systems of various types of engines has resulted in commercially...

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Problems solved by technology

However, in the above publication, it is not indicated at all what type of basalt fiber is used

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