Patent ID: 6705429
Filing Date: 2004-03-16
Classification: F01N

Abstract:
A muffler comprising:a case having opposed ends closed; a partition structure installed in the case to constitute a sound silencing path; inlet and outlet pipes incorporated with the sound silencing path; and a sound shielding wall structure installed in the case to constitute a part of the sound silencing path, wherein the sound shielding wall structure comprises: first and second partition plates; a positioning structure that puts the first and second partition plates together to keep a given distance therebetween; a first group of projections defined by the first partition plate and projected toward the second partition plate, each projection of the first group having a first opening formed therethrough; and a second group of projections defined by the second partition plate and projected toward the first partition plate, each projection of the second group having a second opening formed therethrough, the projections of the second group respectively facing the projections of the first group having a given clearance kept therebetween.