Patent ID: 7993597
Filing Date: 2011-08-09
Classification: F01N

Abstract:
1. A catalyst device comprising: an exhaust pipe arranged to be connected to an engine; a support flange; and a catalyst supported in the exhaust pipe with the support flange, the catalyst being arranged to purify exhaust gas passing through the exhaust pipe, the catalyst including: the catalyst is fixed to the support flange such that an axial direction of the catalyst coincides with a direction in which the exhaust gas flows through the exhaust pipe; an upstream end of the brazing foil is aligned with an upstream end of the support flange in the axial direction of the catalyst such that no portion of the brazing foil is upstream from the upstream end of the support flange; the exhaust pipe includes a first exhaust pipe and a second exhaust pipe connected to each other; each of the first and second exhaust pipes includes an exhaust gas passage through which the exhaust gas passes, and a cooling water passage arranged around the exhaust gas passage; the support flange includes a cooling water passage slit, the support flange being provided at a connecting portion between the first exhaust pipe and the second exhaust pipe; and the cooling water passage of the first exhaust pipe and the cooling water passage of the second exhaust pipe communicate with each other through the cooling water passage slit.