Patent ID: 6550573
Filing Date: 2003-04-22
Classification: F01N,F02B

Abstract:
An exhaust treatment apparatus comprising:an outer shell; an inlet pipe for directing an exhaust stream into the outer shell and an outlet for allowing the exhaust stream to exit the outer shell, the inlet pipe including a pipe wall, the outlet including an outlet pipe that extends through a resonating chamber, and the outlet pipe including a sonic choke; a core positioned within the outer shell, the core including a substrate defining a plurality of channels that extend at least partially through the core, the core also including a catalyst; and a flow distribution arrangement for distributing the exhaust stream across an upstream side of the core, the flow distribution arrangement including: a cover that partially blocks an end of the inlet pipe, the cover defining a plurality of first flow distribution openings for allowing the exhaust stream to pass from the inlet pipe, through the cover to an interior of the outer shell; and the flow distribution arrangement also including a plurality of second flow distribution openings defined through the pipe wall of the inlet pipe for allowing the exhaust stream to pass in a radial direction from the inlet pipe, through the pipe wall to the interior of the outer shell.