Car silencer and barrel thereof

Abstract

The invention discloses a barrel for a car silencer, comprising a shell (1) and a vibration isolation element (4), wherein the inner part of the shell (1) is provided with an inner tube (2), and the two ends of the shell (1) are respectively provided with an end cover (3) which is provided with an opening; at least one end of the inner tube (2) is installed on the corresponding opening of the end cover (3) through the vibration isolation element (4), and the relative position between the part of connecting the vibration isolation element (4) and the inner tube (2) and the end cover (3) is variable along the axial direction of the inner tube (2). Through the automatic adjustment of the inner tube length in the axial direction of the inner tube, thermal stress is released, and thermal stress action does not exist between the inner tube and the end cover, thereby avoiding fatigue failure of the inner tube and the end cover under the action of the thermal stress so that the barrel has long service life so as to prolong the service life of the car silencer. The invention also provides the car silencer comprising the barrel.

Description

technical field [0001] The invention relates to the technical field of automobile muffler, in particular to a cylinder used for an automobile muffler. The present invention also relates to an automobile muffler comprising the cylinder. Background technique [0002] Car noise mainly comes from car exhaust noise. If no muffler is added, the noise can reach more than 100 decibels. Adding a muffler to the exhaust system can reduce the exhaust noise of the car to about 70 decibels. Therefore, the muffler is an important part of the car exhaust system. [0003] Automobile mufflers are mainly cylindrical mufflers, and most of the cylindrical mufflers are resistant or impedance composite mufflers. The cylinder is an important part of the cylindrical muffler. The cylinder includes its outer shell and inner tube inside the shell, and the shell of the cylinder Installed on the exhaust pipe of the car by welding. The diameter of the inner tube is smaller than that of the outer shell,...

AI Technical Summary

Problems solved by technology

[0005] However, during the working process of the barrel muffler, the inside of the barrel passes through the high-temperature airflow, because the inner tube will first contact and touch all the high-temperature airflow, and the outer shell will contact and only touch the airflow after passing through the resonance hole. Therefore, the inner tube The temperature rise of the tube and the outer shell is inconsistent, and the temperature rise of the inner tube is much higher than that of the outer shell, resulting in inconsistent expansion (contraction) rates of the inner tube and the outer shell, resulting in a greater heat loss during expansion of the inner tube and the end cap. The effect of stress makes the inner pipe or end cap produce fatigue fracture failure under thermal stress and vibration, which seriously affects the service life of the cylinder, thereby reducing the service life of the automobile muffler

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