Noise reduction technique for snowmobiles
OwnerJames Vizankoinventor
Life of this patent
Estimating the term…
Abstract
An air intake that reduces the transmission of noise from an internal combustion engine while maintaining high air intake flow rates. The air intake has a duct for delivering air to an internal combustion engine, and resonator volumes in communication with the inside of the duct, to selectively attenuate engine noise at certain frequencies and across certain frequency ranges.
Claims26
An air intake for an internal combustion engine, comprising:
- a duct for directing air intake flow through an interior space in the duct towards an engine for use in internal combustion, the duct having an inlet and an outlet;
- a housing surrounding the duct and defining an enclosed space between the duct and the housing;
- and
- baffle plates extending outwardly from the duct to the housing and dividing the enclosed space into a plurality of resonator volumes, the duct having openings in walls of the duct, the openings establishing fluid communication paths between the interior space of the duct and the resonator volumes to form at least two Helmholtz resonators to attenuate sound pressure energy emanating from the internal combustion engine, the at least two Helmholtz resonators being insulated from each other.
An air intake for an internal combustion engine, comprising:
- a duct for directing air intake flow through an interior space in the duct towards an engine for use in internal combustion, the duct having an inlet and an outlet;
- the duct having openings in walls of the duct, the openings establishing fluid communication paths between the interior space of the duct and enclosed resonator volumes to form two separate Helmholtz resonators to attenuate sound pressure energy emanating from the internal combustion engine, the two Helmholtz resonators being insulated from each other.
A snowmobile having skis, an endless track propulsion mechanism, a steering column for turning the skis, an internal combustion engine for driving the endless track, and an air intake system for delivering air to the internal combustion engine, the air intake system comprising:
- a duct for directing air intake flow through an interior space in the duct towards an engine for use in internal combustion, the duct having an inlet and an outlet;
- a housing surrounding the duct and defining an enclosed space between the duct and the housing;
- and
- baffle plates extending outwardly from the duct to the housing and dividing the enclosed space into a plurality of resonator volumes, the duct having openings in walls of the duct, the openings establishing fluid communication paths between the interior space of the duct and at least two of the resonator volumes to form at least two Helmholtz resonators to attenuate sound pressure energy emanating from the internal combustion engine, the duct further having a perforated portion establishing fluid communication between the interior space of the duct and at least one of the resonator volumes to form at least one sleeve resonator that attenuates sound pressure energy emanating from the internal combustion engine, wherein the at least two Helmholtz resonators are insulated from each other by the at least one sleeve resonator.
Dependencies are inferred from the claim text.