| 摘要 |
In a single-cylinder internal combustion engine fitted with a knock sensor, the temperature rise of the knock sensor is suppressed, and the reliability of the knock sensor is improved. An engine (10) has a crankcase (11), a cylinder block (12) connected to the crankcase (11), a cylinder head (13) connected to the cylinder block (12), a sensor mounting boss (40) formed on the cylinder block (12), and a knock sensor (41) mounted to the boss (40). Fins (33) are formed on the cylinder block (12) and the cylinder head (13). A heat insulation member (45) is provided between the boss (40) and the knock sensor (41). |
