Noise absorbing device for use in suction system of motor vehicle engine e.g. petrol engine, has venturi tube with cross sectional area, and adjusting device that adjusts minimum value of cross sectional area of venturi tube

摘要

The device has a venturi tube (12) with a cross sectional area (13) which assumes a minimum value in a longitudinal run of the venturi tube. An adjusting device (14) adjusts the minimum value of the cross sectional area of the venturi tube. A wall (15) of the venturi tube for adjusting the value of the cross sectional area in an adjusting direction is adjustably supported opposite to a wall (16) of the cross sectional area.