Exhaust Assembly
AssigneeAGCO International GmbH
InventorsDavid Salvadori, Philippe Guichard, Vincent Duro
Life of this patent
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Abstract
A vehicle includes an engine and an exhaust gas outlet assembly with an exhaust outlet pipe surrounded by a tubular heatshield spaced from the exhaust outlet pipe. At least one divider extends between the exhaust outlet pipe and the heatshield to divide an interior volume between the exhaust outlet pipe and the heatshield into two or more sections, each section containing a column of air. The dividers are positioned so that the resonant frequencies of the columns of air do not correspond with a predetermined frequency of the engine. The predetermined frequency of the engine is generally one that arises when the vehicle is in use carrying out tasks for prolong periods of time.
Claims20
A vehicle comprising:
- an internal combustion engine;
- and
- an exhaust system for receiving exhaust gases from the engine, the exhaust system having an exhaust outlet assembly comprising an exhaust outlet pipe surrounded by a heatshield spaced from the exhaust outlet pipe so that air is present in an interior volume between the exhaust outlet pipe and the heatshield, the exhaust assembly having a first length over which the heatshield overlaps the exhaust outlet pipe, wherein at least one divider extends between the exhaust outlet pipe and the heatshield to divide the interior volume between the exhaust outlet pipe and the heatshield into two or more longitudinal sections, each section containing a column of air having a length less than the first length of the exhaust outlet assembly;
- wherein the at least one divider is located such that none of the columns of air has a resonant frequency that corresponds to a predetermined frequency Fe1 of the engine, and wherein a ratio of the resonant frequency F0 of the column of air in each section of the exhaust outlet assembly to the predetermined frequency Fe1 of the engine is greater than 0.85*√2 .
Dependencies are inferred from the claim text.