| 摘要 |
PURPOSE:To contrive to make the whole of a device compact by arranging the valve case of a snifting valve between the respective entrance passages of two superchargers wherein the valve is arranged in such a way as to go around an exhaust cut valve which interrupts exhaust gas flow to a secondary turbine at the time of low revolutions. CONSTITUTION:Each turbine 4 and 6 and each blower 8 and 9 on the primary and secondary sides of an exhaust turbo supercharger 46 are arranged for two each of exhaust passages and air intake passages respectively. And an exhaust cut valve 18 is provided for an exhaust passage on the secondary side which is suspended in a low revolution range, and a snifting valve 24 is concurrently provided for a snifting passage arranged in such a way as to go around the exhaust cut valve 18. And in this case, each turbine 4 and 6 has those exhaust openings arranged in such a way as to be faced with each other, and a valve case 50d for which the exhaust snifting valve 24 is provided, is formed menolithically with a turbine scroll section 50b on the secondary side between the exhaust entrance passages of both of the turbines 4 and 6. The exhaust snifting valve 24 is opened/closed by an actuator 23. |
