F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
F02M 35/12 (2006.01) F01N 13/16 (2010.01) F01N 1/08 (2006.01) F16L 55/033 (2006.01)
Patent
CA 2063708
2063708 9100958 PCTABS00003 An in-line noise attenuation device for insertion into a gas induction system, such as the air induction system of an automotive vehicle internal combustion engine. The device comprises two plastic parts snap-fitted together. One part is an outer tube (16), and the other part, an insert (18) disposed within the first part. The insert comprises a hollow ogival-shaped section (30) that is axially coextensive with a frusto-conically shaped section of the outer tube (16) to form an annular flow path of substantially constant cross section for the inducted air. The flow then passes through apertures (42) in the insert (18) to enter a venturi section. The flow continues through the venturi section and then exits the device. The venturi section (46, 48) serves to choke noise that propagates from the engine in the direction opposite the direction of airflow. The noise is reflected back to the engine by the hollow interior of the ogival-shaped section which is open toward the venturi section.
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
Siemens Automotive Limited
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