초록 ▼

A plug section for a muffler, including an outer body and having an inlet pipe for introducing exhaust gas into the body. The inner end of the inlet pipe located within the body portion is closed off. Surrounding the inlet pipe is a conical baffle having a small diameter end secured to the inlet pip

A plug section for a muffler, including an outer body and having an inlet pipe for introducing exhaust gas into the body. The inner end of the inlet pipe located within the body portion is closed off. Surrounding the inlet pipe is a conical baffle having a small diameter end secured to the inlet pipe to provide a tapered chamber between the inlet pipe and the conical baffle, while the space between the conical baffle and the outer body defines an outer chamber. Both the inlet pipe and the conical baffle are provided with a plurality of perforations. Exhaust gas entering the inlet pipe flows outwardly through the perforations in the inlet pipe to the tapered inner chamber and then flows through the perforations in the conical baffle to the outer chamber. The use of the perforated conical baffle provides a substantial improvement in sound attenuation, reducing both the shell noise level and the outlet noise level.

대표청구항 ▼

A plug section for a muffler having improved sound attenuation characteristics, comprising an outer body, an inlet pipe to introduce exhaust gas to the body and having an inner end portion disposed within the body, a closure to close off the inner end portion of said pipe, said pipe having a plurali

A plug section for a muffler having improved sound attenuation characteristics, comprising an outer body, an inlet pipe to introduce exhaust gas to the body and having an inner end portion disposed within the body, a closure to close off the inner end portion of said pipe, said pipe having a plurality of perforations extending substantially the entire length of said end portion, a generally conical member disposed within the body and surrounding said pipe and having a small diameter end and a large diameter end, said conical member having a plurality of second perforations extending substantially the entire length of said conical member, said conical member being spaced outwardly from said pipe to define an inner chamber therebetween and being spaced from the body to provide an outer chamber, said inner chamber being empty and constituting a sound attenuating chamber, and closure means for closing off the ends of said conical member, exhaust gas entering the section through said pipe flowing transversely outward through said first perforations into said inner chamber and then flowing transversely outward through said second perforations to said outer chamber and subsequently being discharged from said section.