| 摘要 |
PROBLEM TO BE SOLVED: To satisfy both of improvement in a catalyst warming-up property and cool exhaust.SOLUTION: A secondary air supply device includes a plurality of exhaust cooling fins that extend along a longitudinal direction of an exhaust port included in an internal combustion engine; a secondary air supply port that opens at a groove formed between the neighboring exhaust cooling fins, among the plurality of exhaust cooling fins; and an air-injection system that injects secondary air from the secondary air supply port. The secondary air supply port is opened in the vicinity of an open edge of the groove. As a result, an air space is formed by the secondary air, its heat insulation effect maintains an exhaust temperature, and a catalyst warming-up property is improved. |
