Patent ID: 7445083

Claim:
An automotive muffler, comprising: a) an external tube consisting of a first widened portion, a first tapering portion, and a first narrow portion, the first widened section having a sealing wall with a through hole at the front end thereof; b) an internal tube consisting of a second widened portion, a second tapering portion, and a second narrow portion, the internal tube being disposed within the external tube in such a manner that the front end of the second widened section is compressed against the sealing wall and the rear end of the second narrow section is extended into the first narrow portion, a plurality of vent holes being formed in the wall of the second widened portion; c) an internal guide tube consisting of a third widened portion, a third tapering portion, and a third narrow portion, the internal guide tube being disposed within the internal tube in such a manner that the front end of the third widened section projects out of the through holes and the rear end of the third narrow section is extended into the second narrow portion, a plurality of vent holes being formed in the wall of the third widened section that is disposed within the internal pipe; and d) a plurality of partitions interposed between the first widened section and the second widened section as well as between the second widened section and the third widened section for separating several sound-absorbing chambers with different sizes and in different positions.