Patent ID: 6116376
Filing Date: 2000-09-12
Classification: F01N

Abstract:
An improved structure of a muffler, wherein two spacers are installed within a cylinder, the cylinder is divided into a front chamber, a resonance canceling chamber and a noise canceling chamber, a first pressure returning tube and a second pressure returning tube are serially connected within the cylinder, a plurality of gas holes are circularly installed within the first pressure returning tube and the second pressure returning tube so that the first pressure returning tube and the second pressure returning tube pass through the front chamber, resonance canceling chamber and noise canceling chamber, stainless steel nets and noise canceling sponge enclose the second pressure returning tube within the noise canceling chamber, whereina spacer circularly installed with a plurality of through holes is installed within the front chamber, the front chamber is divided into an expansion chamber and an air pressure regulating chamber, a central hole is located in the center of the spacer, the front end of the first pressure returning tube is placed in the central hole of the spacer, a proper gap is formed between the front end of first pressure returning tube and the central hole of the spacer.