| 摘要 |
<p>PURPOSE:To reduce the heatproof property required to an air bypass passage and a switch valve, and to reduce the manufacturing cost, by providing the switch valve on the way of the air bypass passage to connect the air passages at the upper stream side of a turbocharger and at the downstream side of an intercooler. CONSTITUTION:When an engine 2 is driven, the air fed from an air-cleaner 12 side is pressurized by a turbocharger 14, and then, cooled by an intercooler 16. And the air at the downstream side of the intercooler 16 is fed to the upper stream side of the turbocharger 14 through an air bypass passage 20 in which an air bypass valve 22 is opened when the turbocharger 14 is decelerated. In this case, the noise generated when the air bypass valve 22 is operated is reduced by an air bypass valve chamber 26 provided at the downstream side of the air bypass valve 22. As a result, the heatproof property required to the air bypass passage 20 and the air bypass valve 22 can be reduced, and the air bypass passage 20 and the air bypass valve 22 can be formed without using an expensive material.</p> |
