Structure or shape of exhaust gas passages, pipes or tubes

Child Classifications

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• F01N 2470/02 Tubes being perforated
• F01N 2470/06 Tubes being formed by assembly of stamped or otherwise deformed sheet-metal
• F01N 2470/08 Exhaust gas passages being formed between the walls of an outer shell and an inner chamber
• F01N 2470/10 Tubes having non-circular cross section
• F01N 2470/12 Tubes being corrugated
• F01N 2470/14 Plurality of outlet tubes, e.g. in parallel or with different length
• F01N 2470/16 Plurality of inlet tubes, e.g. discharging into different chambers
• F01N 2470/18 the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus
• F01N 2470/20 Dimensional characteristics of tubes, e.g. length, diameter
• F01N 2470/22 Inlet and outlet tubes being positioned on the same side of the apparatus
• F01N 2470/24 Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
• F01N 2470/26 Tubes being formed by extrusion, drawing or rolling
• F01N 2470/28 Tubes being formed by moulding or casting x
• F01N 2470/30 Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow