Patent ID: 6089347
Filing Date: 2000-07-18
Classification: F01N

Abstract:
In a muffler including a casing having an inlet opening and an outlet opening, a first divider partition secured in the casing and formed and positioned to divide substantially all incoming exhaust gases for flow along a main flow path in the casing past outward ends of the first partition, and a second collector partition secured in the casing downstream of the first divider partition, the second collector partition forming in part a collector opening and the second collector partition being formed to direct the divided exhaust gases toward each other for flow of substantially all of the exhaust gases through the collector opening, the improvement in the muffler comprising:a first intermediate partition secured in the casing between and spaced from the divider and collector partitions, the intermediate partition being formed to permit flow of the divided exhaust gases past outward ends of the intermediate partition, the outward end portions of the intermediate partition being spaced from the outward end portions of the divider partition,the spaces defined between the outward end portions of the divider partition and outward end portions of the intermediate partition being oriented with respect to the main flow path so as to create a low pressure region in these spaces as exhaust gases flow along the main flow path past the outward ends of the divider and intermediate partitions,the first divider partition and the first intermediate partition being sufficiently non-porous to maintain the low pressure region therebetween.