Device for noise and temperature insulation of an exhaust gas outlet on a portable engine powered tool
OwnerGustaf Doragripinventor
Life of this patent
Estimating the term…
Abstract
The claimed invention illustrates a solution that will make it possible to lead exhaust gas from a combustion engine (10) through a noise insulating cover (11) without reducing the noise insulating effect of the cover (11). This is possible by leading the exhaust gas through an expansion chamber (15) made of a material that insulates the cover (11) from the high temperature exhaust gas. The expansion chamber (15) is shaped so that the exhaust gas is lead through a curved channel in order to prevent the noise from spreading outside the cover (11).
Claims9
Device for noise and/or heat insulation of a exhaust gas outlet on a portable engine-powered tool with a cover (10) that surrounds the engine (11) or other noise generating parts, characterised in that the exhaust gas is lead through the cover (11) via an expansion chamber (15).
Device according to any of the previous claims, characterised in that the expansion chamber (15) is made of a sound insulating material.
Device according any of the previous claims, characterised in that the expansion chamber (15) has an inlet (17) with a cross section that is bigger than the cross section of an exhaust pipe (16) from the engine (11) so that air from the inside of the cover (10) is sucked into the expansion chamber (15) and mixed with the exhaust gas in the expansion chamber (15).
Device according to any of previous claims, characterised in that the exhaust gas is lead through the expansion chamber (15) in a curved direction.
Device according to any of previous claims, characterised in that the expansion chamber (15) is integrated in the cover (10).
Dependencies are inferred from the claim text.