A manufacturing method of a sub-muffler -parenthesis-1, 201) includes a rectangular tubular body shaping step -parenthesis-S3), a preliminary shaping step -parenthesis-S5, S26), and a diameter reduction shaping step -parenthesis-S7, S27). In the rectangular tubular body shaping step -parenthesis-S3), a plate material -parenthesis-70) is bent and a rectangular tubular body -parenthesis-72, 720) having a rectangular shape in cross section is thereby formed. In the preliminary shaping step -parenthesis-S5, S26), ends -parenthesis-724, 725) of the rectangular tubular body -parenthesis-72, 720) are preliminarily formed and the end parts of the tubular body -parenthesis-72, 720) are thereby formed so that its cross-sectional shape becomes a circular shape. In the diameter reduction shaping step -parenthesis-S7, S27), the diameters of the ends -parenthesis-724, 725) of the rectangular tubular body -parenthesis-72, 720) are reduced.
SUB-MUFFLER AND MANUFACTURING METHOD OF SUB-MUFFLER
2015-11-12
Patent
Elektronische Ressource
Englisch
IPC: | F01N GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL , Schalldämpfer oder Auspuffvorrichtungen für Gase von Kraft- und Arbeitsmaschinen oder von Kraftmaschinen allgemein / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES |