Patent ID: 9121320
Filing Date: 2015-09-01
Classification: F01N,Y10T

Abstract:
1. A method of manufacturing a muffler for an exhaust system of an internal combustion engine, the method comprising: providing a flat, one-piece sheet metal blank having first and second opposing edge portions; forming the blank into a tubular shell by bending the blank so that the first and second edge portions face each other and fixing the first and second edge portions in contact with each other, the tubular shell defining a central cavity and first and second end cavities, the first and second end cavities having larger cross-sectional areas than a cross-sectional area of the central cavity; inserting a first subassembly through a first axial end of the tubular shell and positioning the first subassembly in the central cavity, the first subassembly including first and second pipes and a plurality of baffles; inserting a second subassembly into the first axial end of the tubular shell and fixing the second subassembly in the first end cavity such that a first outlet pipe of the second subassembly is fluidly connected with the first pipe of the first subassembly; and inserting a third subassembly into a second axial end of the tubular shell and fixing the third subassembly in the second end cavity such that a second outlet pipe of the second subassembly is fluidly connected with the second pipe of the first subassembly.