| 摘要 |
A high efficiency, compact muffler apparatus for use with internal combustion engines comprises a tubular muffler housing internally divided into first, second and third longitudinal chambers by first and second transverse wall partitions. An exhaust inlet duct base axially through the upstream housing end into the first chamber and an exhaust outlet duct extends axially through the downstream housing end through the third chamber to the downstream side of the second partition. A pair of diametrically spaced, internal ducts, open at both ends, project longitudinally, out of alignment with the inlet and outlet ducts, through the two wall partitions from the first chamber, wherein upstream duct ends overlap the inlet duct, through the second chamber and into the third chamber. Several longitudinal, opposing rows of small tubular, aperture-defining elements project from each of the internal ducts in the region of the second chamber. A third transverse wall partition, disposed in the first chamber, creates a small fourth chamber between the first and second chambers; large openings are formed in side-walls of the internal ducts within such fourth chamber. Three longitudinally spaced and opposing pairs of short inlet tubes project laterally from portions of the exhaust duct in the third chamber, downstream of the downstream ends of the internal ducts. The muffler housing may be cast or molded in segmented form from a non-ferrous metal such as aluminum and may include longitudinal cooling fins, or may be formed of corrosion resistant sheet metal. Within the muffler the exhaust gases and sound waves are separated, the sound waves being substantially attenuated in the various chambers. A variation utilizing a somewhat different internal construction is also described.
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