Perforated end pipe of silencer unit
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United States of America Patent
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-
Oct 7, 2003
Grant Date -
Nov 29, 2001
app pub date -
Jun 30, 2001
filing date -
Dec 30, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a device in a silencer unit of an automotive vehicle, for suppressing unwanted noise originating from an exhaust gas flow from the vehicle engine, said silencer unit being terminated by an end pipe, through which said exhaust gas flow is conveyed to the surroundings. The invention is characterized by the end pipe comprising at least one perforated section having a predetermined extension (L.sub.2) in the longitudinal direction of the end pipe, and being positioned downstream of a point (L.sub.3) along the end pipe where there is substantially no turbulence in the exhaust flow. Through the invention, an improved silencer unit is provided, with which predetermined requirements for comfort directed low-frequency suppression of the exhaust flow noise, as well as statutory requirements for high-frequency absorption of the noise, are fulfilled.
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