Patent ID: 7044266
Filing Date: 2006-05-16
Classification: F01N

Abstract:
1. An exhaust muffler for an internal combustion engine, comprising a casing; said casing including a front wall, a rear wall and a side wall; said side wall extending in a loop about said front and rear walls, said front wall including an exhaust gas inlet and said rear wall including an exhaust gas outlet; a first compartment wall; said first compartment wall including a first central circular passage and a first pair of side circular passages, said side circular passages of said first pair of side circular passages being respectively located equally spaced on opposite sides of said first central circular passage; and said side circular passages of said first pair of side circular passages being smaller in area than the area of said first central circular passage, a second compartment wall; said second compartment wall including a second central circular passage and a second pair of side circular passages, said side circular passages of said second pair of side circular passages being respectively located equally spaced on opposite sides of said second central circular passage; said side circular passages of said second pair of side circular passages being smaller in area than the area of said second central circular passage; said first compartment wall being mounted in said casing behind said front wall of said casing with said first central passage of said first compartment wall being aligned with and spaced from said exhaust gas inlet and with the outer periphery of said first compartment wall being in contact with said side wall of said casing to define a first compartment within said casing; said second compartment wall being mounted in said casing spaced in front of said rear wall of said casing with said second central circular passage in said second compartment wall being aligned with said exhaust gas outlet in said rear wall of said casing and with the outer periphery of said second compartment wall being in contact with said side wall of said casing to define a second compartment in said casing; first and second gas divider baffles; said first gas divider baffle for dividing a first side circular passage of said pair of side circular passages in said first compartment wall into a plurality of passages, said first gas divider baffle being positioned behind said first compartment wall in confronting relationship with said first side circular passage of said pair of side circular passages; said second gas divider baffle for dividing a second side circular passage of said pair of side circular passages in said first compartment wall into a plurality of passages, said second gas divider baffle being positioned behind said first compartment wall in confronting relationship with said second side circular passage of said pair of side circular passages; a first elongate tubular member, said first elongate tubular member having an axis and front and rear ends, and being of a first predetermined diameter and first predetermined length; said first tubular member including an entrance at said front end for receiving exhaust gas within the interior of said tubular member and an exit at said rear end for permitting exit of exhaust gas from the interior of said tubular member; said first elongate tubular member being positioned inside said casing in between said first and second compartment walls with said entrance at said front end being aligned with said central opening in said first compartment wall for receiving exhaust gas from said first compartment and with said exit at said rear end being aligned with said central opening in said second compartment wall for permitting exhaust gas to exit into said second compartment; said first elongate tubular member including a plurality of small gas passages through the side of said first elongate tubular member for permitting passage of exhaust gas between the interior and exterior of said first tubular member; said plurality of small gas passages in said first tubular member being arranged in a plurality of rows, each of said rows extending longitudinally of said first tubular member, said rows of said plurality of rows being equally angularly spaced about said axis of said first tubular member; and a third divider baffle located in the interior of said first tubular member; said third divider baffle being positioned at said entrance of said first tubular member and extending inside said first tubular member a first predetermined longitudinal distance along said axis of said first tubular member for dividing a portion of the interior of said first tubular member into a plurality of sectors, wherein exhaust gas entering said tubular member is divided into a plurality of streams of exhaust gas over said first predetermined longitudinal distance.