Silencer for automobile

Abstract

A car muffle comprises a housing (1), an inlet pipe (4) and an outlet pipe (5), wherein, the car muffle further comprises at least a clapboard (2), a resonance pipe (6) and a control valve (8). The outer margin of the clapboard (2) is in sealed connection with the inner wall of the housing (1) and the inner part of the housing (1) is divided into at least two non-communicated chambers (3), and theinlet pipe (4) is inserted from one end of the housing (1); the outlet pipe (5) is inserted from the other end thereof; through-holes are formed on the circumference of the pipe body of the inlet pipe (4) which is positioned inside the chamber where the a port of the outlet pipe (5) is disposed; the control valve blocks off the port (6A) at one end of the resonance pipe (6) and a valve control device (9) controls the opening degree of the valve (8). The muffle can automatically adjust the area of airflow according to air displacement so as to adapt to different working conditions of the engine, thus improving noise elimination effect and reducing exhaust backpressure.

Description

technical field [0001] The invention relates to a vehicle muffler, more specifically, to an engine exhaust muffler. Background technique [0002] The general exhaust muffler usually achieves the purpose of noise reduction through structural features. The exhaust pipe is a long pipe, which is continuously winding and then encapsulated by the shell; because the exhaust pipe is a long round pipe, it cannot be bent too large (easy to crack), so it must be welded with elbows at the bends, the design is complicated, and the processing hours are also many, and the complicated internal structure will make the airflow unobstructed, greatly increasing the exhaust back pressure, thereby increasing the power of the powertrain loss. [0003] For this reason, CN2871858 discloses a kind of automobile muffler, is made up of cylinder body, three dividing plates, air intake pipe, air outlet pipe and front and rear end caps. The partition divides the cylinder into four chambers. The air inle...

AI Technical Summary

Problems solved by technology

Although the muffler makes the flow of the exhaust gas flow in the muffler cavity smoother and can reduce the exhaust back pressure to a certain extent, when the engine speed increases or the exhaust volume increases, the output power and exhaust characteristics must be satisfied. In order to meet the requirements of the requirements, it is necessary to increase the passing area of ​​the air flow, but the area of ​​the air flow passing through the muffler is always the same, which will reduce the noise reduction effect and increase the exhaust back pressure.

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