| 摘要 |
<p>PURPOSE:To compact a suction system obtaining a high resonance effect in a broad range by integrally forming a high speed suction passages whose practical air passing length is set to be short and low sped suction passages whose practical air passing length is set to be long. CONSTITUTION:In middle and low speed ranges to utilize a resonance effect, a communication passage closing valve 37 is closed and high speed suction passage closing valves 31 and 32 are opened in running at specified high speed. This generates resonance pressure waves in high speed suction passages 21 and 22 whose practical air passing length is set to be short regarding the spread of pressure waves. In addition, the communication passage closing valve 37 and high speed suction passage closing valves 31 and 32 are closed in running at specified low speed. This makes the pressure waves spread reciprocally between a suction port and low speed suction passage junction section 24 passing through an independent suction passage 3, high speed suction passages 21 and 22 and low speed suction passages 25 and 26 in order. Thus, a titled suction system can be compacted enhancing charging efficiency by effectively utilizing resonance effect in a broad speed range.</p> |
