摘要 |
PROBLEM TO BE SOLVED: To reduce airflow noise generated in a bypass passage for preventing surging of a compressor of a supercharger of an engine. SOLUTION: An air by-pass device is equipped with an air bypass passage which is composed of an introduction pipe 17 branched from an intake pipe 5 between an intercooler 15 disposed upstream of a throttle valve 16 and the compressor 12 of a turbo charger 4, an air passage 18 communicating to the introduction pipe 17 and a crank case 9 interior communication to the air passage 18, and bypasses the throttle valve 16, and an air bypass valve 20 for opening/closing the introduction pipe 17. The air bypass device 1 introduces the intake air compressed by the compressor 12 into an engine body interior 3 and prevents the airflow noise from being propagated to an engine exterior. COPYRIGHT: (C)2009,JPO&INPIT
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