EXHAUST PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

An exhaust purifying device for an internal combustion engine is provided with an exhaust manifold (19), a catalytic converter (21) provided at an angle to the exhaust manifold (19) at a position downstream of the exhaust manifold (19) and incorporating a NOx occluding and reducing catalyst (20), and a reducing agent supply device (22) for supplying a reducing agent to exhaust gas passing through the inside of the exhaust manifold.  A projection (35) projecting outward radially of a casing (30) of the catalytic converter is provided to the inner wall surface of the casing (30) at a position facing the exit of the exhaust manifold.  That portion of the wall surface which defines the projection is formed in such a manner that the component, in the direction of the axis of the casing, of the speed of the flow of at least a portion of the exhaust gas flowing into the projection is oriented by the projection in the direction opposite the direction toward the NOx occluding and reducing catalyst.  The exhaust purifying device can minimize an increase in loss of pressure of the exhaust gas and can disperse the reducing agent, which is supplied from the reducing agent supply device, into the exhaust gas.