EXHAUST MUFFLER OF INTERNAL COMBUSTION ENGINE Russian patent published in 2003 - IPC

FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: invention can be used in portable gasoline engine-powered saws. Muffler contains chamber in middle part of which longitudinal partition with holes made in its lower part is installed. These holes are located at bottom plane of muffler chamber. Muffler has branch pipe. Chamber is ellipsoidal in shape and summary area of holes is equal to 0.02-0.03 of total area of partition proper. EFFECT: reduced noise in range of dominant frequencies of 1000- 1200 Hz. 1 dwg