Exhaust gas purifier for engine attached to the outside of boat

Abstract

Abstract PURPOSE:To very surely purify exhaust gas in two stages, by providing two catalysts at a prescribed spacing in an exhaust gas passage and placing the first catalyst at a high-temperature part near a cylinder. CONSTITUTION:The exhaust gas is discharged from the cylinder 1b through an exhaust port 1a so that the exhaust gas comes into contact with the first catalyst 9 for oxidation. The carbon monoxide and hydrocarbon in the exhaust gas are thus decreased. The exhaust gas is then passed through an exhaust cover 2 and holes 1c, 3a so that the gas comes into contact with the second catalyst 10 for oxidation of not yet oxidized carbon monoxide and hydrocarbon. The exhaust gas is then released through an exhaust pipe 4. Because the catalysts are provided in two stages, the exhaust gas is purified well. Since the first catalyst is located near the cylinder 1b, the oxidation is caused at the place where the temperature of the exhaust gas is still high. The efficiency of the purification is thus raised further.

Inventors

• 👤 Senji Kawase
• 👤 Daisuke Aoki

Bibliographic Details