| 摘要 |
PURPOSE:To prevent heated introduction air from being cooled by running air. CONSTITUTION:A wind-proof cover 28 is arranged to the outer peripheral parts of a heater 21 and an air introduction pipe through which heated air flows. Since running air is shielded by the wind-proof cover 28, running air is prevented from blowing against the heater 21 and the air introduction pipe. Thereby, since the heater 21 and the air introduction pipe are prevented from being cooled by running air, the temperature of heated air is not decreased even during running. Thus, the temperature of introduction air is maintained at a given temperature and exhaust gas is stably purified. |
