US 11,808,187 B2
Noise attenuation components
Dustin Irvin Landwehr, Kewanee, IL (US); Jim K Carroll, Peoria, IL (US); David Charles Copley, Peoria, IL (US); Rakesh Chandran Ramachandran, Dunlap, IL (US); Timothy Josiah Lee, Morton, IL (US); Yung T. Bui, Peoria, IL (US); and Anthony C. Rodman, Peoria, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Mar. 1, 2021, as Appl. No. 17/189,252.
Prior Publication US 2022/0275737 A1, Sep. 1, 2022
Int. Cl. F01N 1/02 (2006.01); F01N 1/04 (2006.01); F01N 3/28 (2006.01)
CPC F01N 1/023 (2013.01) [F01N 1/04 (2013.01); F01N 3/2825 (2013.01); F01N 2330/06 (2013.01); F01N 2490/155 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A reduction device, comprising:
a housing defining:
an input chamber configured to receive exhaust from a power source,
an output chamber downstream of the input chamber,
an exhaust channel disposed between the input chamber and the output chamber, the exhaust channel configured to direct the exhaust from the input chamber to the output chamber, and
a longitudinal axis extending substantially centrally through the housing;
a treatment unit disposed in the exhaust channel and along the longitudinal axis, the treatment unit including a first surface facing the input chamber, the first surface being configured to receive the exhaust from the input chamber, the treatment unit being configured to at least partly remove pollutant species from the exhaust as the exhaust passes through the exhaust channel; and
an attenuation component disposed in the housing and radially outward of the treatment unit, wherein:
an inlet of the attenuation component is formed by a second surface of the attenuation component downstream of the input chamber and substantially coplanar with the first surface,
the input chamber directs the exhaust received from the power source unimpeded to the inlet,
the attenuation component is fluidly connected to the exhaust channel, and is configured to attenuate a range of frequencies corresponding to operation of the power source at a rated load, and
the exhaust channel prohibits exhaust entering the input chamber from exiting the housing without passing through the treatment unit.