Abstract: A changeover valve includes: a valve body portion that closes an opening formed at a switching position of an exhaust flow path; a fixing portion that rotatably fixes the valve body portion; a first raised portion protruding at one of a flow path forming portion and the fixing portion; a cushion portion; a second raised portion protruding at the valve body portion; and a biasing portion that biases the valve body portion. The first raised portion has an inclined portion inclined relative to a valve closing direction and the second raised portion has an inclined portion inclined relative to the valve closing direction. Both of the inclined portions are contactable with each other at the time of valve closing.

Abstract: A changeover valve includes: a valve body portion that closes an opening formed at a switching position of an exhaust flow path; a fixing portion that rotatably fixes the valve body portion; a first raised portion protruding at one of a flow path forming portion and the fixing portion; a cushion portion; a second raised portion protruding at the valve body portion; and a biasing portion that biases the valve body portion. The first raised portion has an inclined portion inclined relative to a valve closing direction and the second raised portion has an inclined portion inclined relative to the valve closing direction. Both of the inclined portions are contactable with each other at the time of valve closing.

Abstract: An exhaust gas purification device comprises a catalyst disposed to the exhaust-gas flow path, and an inhibiting member that is disposed downstream of the catalyst in the exhaust-gas flow path, and diminishes a bias in flow-rate distribution of exhaust gases that flow into the catalyst by inhibiting a partial flow of the exhaust gases that flowed out of the catalyst, wherein the inhibiting member comprises a concave part comprising a concave shape facing the catalyst, and inhibits, by the concave part, a partial flow of the exhaust gases that flowed out of the catalyst.

Abstract: An exhaust gas purification device comprises a catalyst disposed to the exhaust-gas flow path, and an inhibiting member that is disposed downstream of the catalyst in the exhaust-gas flow path, and diminishes a bias in flow-rate distribution of exhaust gases that flow into the catalyst by inhibiting a partial flow of the exhaust gases that flowed out of the catalyst, wherein the inhibiting member comprises a concave part comprising a concave shape facing the catalyst, and inhibits, by the concave part, a partial flow of the exhaust gases that flowed out of the catalyst.

Abstract: An exhaust gas purification device comprises a first channel member that forms an exhaust gas flow path leading to a catalyst and a second channel member that forms a reducing agent flow path guiding a reducing agent injected by an injector to the exhaust gas flow path upstream of the catalyst. The second channel member is inserted so as to penetrate a side wall of the first channel member to protrude into the exhaust gas flow path.

Abstract: An exhaust gas purification device includes: a catalyst downstream from an enlarged diameter flow path in an exhaust gas flow path; a diffusing member upstream from the enlarged diameter flow path in the exhaust gas flow path and that causes exhaust gas that has flowed in from upstream to flow out so that said exhaust gas diffuses toward the enlarged diameter flow path; a supply device that supplies a reducing agent upstream from the diffusing member in the exhaust gas flow path; and a guiding member upstream from the diffusing member either at a flow mixing position in the exhaust gas flow path where the reducing agent and the exhaust gas mix or at a position downstream from the flow mixing position, and that splits the flow of the reducing agent that has flowed in from upstream into a plurality of flows and guides said flows toward the diffusing member.