ENGINE EXHAUST APPARATUS

摘要

An engine exhaust apparatus includes an exhaust passage for flowing exhaust gas emitted from an engine, a flow rectifier for rectifying the flow of the exhaust gas, and an exhaust heat recovery unit disposed in the exhaust passage downstream of the flow rectifier. The exhaust heat recovery unit is provided with an exhaust heat recovery portion and a cooling portion to cool the exhaust heat recovery portion. The engine exhaust apparatus further includes a first diameter reducing portion gradually reduced in diameter toward the exhaust heat recovery unit from the flow rectifier, and a second diameter reducing portion gradually reduced in diameter toward the downstream from the exhaust heat recovery unit.

主权项

1. An engine exhaust apparatus engine comprising:
an exhaust passage configured to receive exhaust gas emitted from the an engine, the exhaust passage having a first diameter reducing portion and a second diameter reducing portion; a flow rectifier having a rectifying portion configured to rectify flow of the exhaust gas in the exhaust passage; an exhaust heat recovery unit disposed in the exhaust passage downstream of the flow rectifier, the exhaust heat recovery unit including an exhaust heat recovery portion configured to recover heat of the exhaust gas and a cooling portion configured to cool the exhaust heat recovery portion from an outer peripheral side using cooling fluid, the first diameter reducing portion having a gradually reducing diameter in a direction toward the exhaust heat recovery unit from the flow rectifier, and the second diameter reducing portion having a gradually reducing diameter toward a direction downstream of the exhaust heat recovery unit.