Patent ID: 7418818
Filing Date: 2008-09-02
Classification: F01N,Y02A

Abstract:
1. An exhaust system for exhausting gas from a plurality of cylinders of an engine, the exhaust system comprising: a plurality of first exhaust pipes corresponding in number to the plurality of cylinders, into which the gas exhausted from the plurality of cylinders flows, respectively; a first catalyst device having a first catalyst that cleanses the gas introduced from the plurality of first exhaust pipes; a plurality of second exhaust pipes corresponding in number to the plurality of cylinders; a first coupler arranged to assemble and couple first ends of the plurality of first exhaust pipes to the first catalyst device, the first coupler having a plurality of first inflow portions corresponding in number to the plurality of first exhaust pipes; and a second coupler arranged to assemble and couple first ends of the plurality of second exhaust pipes to the first catalyst device, the second coupler having a plurality of second inflow portions corresponding in number to the plurality of second exhaust pipes; a third coupler arranged to assemble second ends of the plurality of second exhaust pipes; and a second catalyst device that is connected to the third coupler such that the third coupler couples the second ends of the plurality of second exhaust pipes to the second catalyst device, the second catalyst device having a second catalyst for cleansing the gas introduced from the plurality of second exhaust pipes; wherein the plurality of first inflow portions are not in communication with each other, the plurality of second inflow portions are not in communication with each other, and the plurality of second inflow portions are arranged so as to be opposed to the plurality of first inflow portions, respectively, with the first catalyst device interposed therebetween; and the third coupler does not include a partition such that the gases from the plurality of second exhaust pipes merge together in the third coupler before entering the second catalyst.