Exhaust muffler that automatically follows the two working conditions of the internal combustion engine

Abstract

An internal combustion engine exhaust silencer capable of automatically following two working conditions comprises a pipe 1 and a sealed first resonant cavity 21 outside the pipe 1, and is characterized in that a first round hole 13 is formed in a wall surface of the pipe 1, and communicates with a cavity of the pipe 1 and the first resonant cavity 21; a first cylinder 11 is arranged on the inner wall, which is opposite to the first round hole 13, of the pipe 1, and extends into the first round hole 13; and the expansion coefficient of the material of the first cylinder 11 is smaller than the expansion coefficient of the materials of the pipe 1 and the first resonant cavity 21.

Description

technical field

[0001] The invention relates to an exhaust muffler for an internal combustion engine. technical background

[0002] Construction machinery and vehicles widely use internal combustion engines as power. In recent years, people have become more and more strict on the vibration and noise control of internal combustion engines. Noise control has gradually become a technical barrier for related products to enter the market. The noise of the internal combustion engine mainly comes from the exhaust noise of the engine. The most common way to reduce the exhaust noise is to install an exhaust muffler in the exhaust pipe system of the engine. The exhaust muffler can not only allow the airflow to pass smoothly, but also effectively prevent Or weakening the outward propagation of sound energy is a simple and effective method to control exhaust noise. It has been widely used in noise control engineering. There are many types of mufflers, which can be divided into three t...

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