초록 ▼

A muffler comprises a plurality of stackable stages 1, 2 and 3. Each stage is comprised of a phase opposition circuit. In each phase opposition circuit exhaust gases are divided into two paths towards an outlet where they are recombined. The difference in length between the two paths equals half a w

A muffler comprises a plurality of stackable stages 1, 2 and 3. Each stage is comprised of a phase opposition circuit. In each phase opposition circuit exhaust gases are divided into two paths towards an outlet where they are recombined. The difference in length between the two paths equals half a wavelength of a selected frequency.

대표청구항 ▼

An exhaust gas noise silencing process for exhaust gas stream of an internal combustion engine, including the steps of: determining a frequency at which a particularly loud exhaust gas sound level is obtained from the internal combustion engine exhaust gas stream; admitting the exhaust gas stream to

An exhaust gas noise silencing process for exhaust gas stream of an internal combustion engine, including the steps of: determining a frequency at which a particularly loud exhaust gas sound level is obtained from the internal combustion engine exhaust gas stream; admitting the exhaust gas stream to a first phase opposition circuit in which the stream divides into two components that travel along two different paths which differ from one another in length by about half a wavelength corresponding to said frequency; recombining the two components at the downstream end of the first phase opposition circuit and passing the recombined stream along a path having at least a predetermined minimum length; at the downstream end of this latter path, admitting the exhaust gas stream to a second phase opposition circuit in which the stream again divides into two components that travel along two different paths which differ from one another in length; again recombining the two components at the downstream end of the second phase opposition circuit, thereby constituting a quieter exhaust gas stream.