Reductant aqueous solution mixing device and exhaust aftertreatment device provided with the same

A reductant aqueous solution mixing device interposed between a filter device that captures particulate matters in an exhaust gas and a selective catalytic reduction device disposed downstream of the filter device, the reductant aqueous solution mixing device adding a reductant aqueous solution in the exhaust gas, the reductant aqueous solution mixing device comprising:

• an elbow pipe attached to an outlet pipe of the filter device, the elbow pipe changing a flow direction of the exhaust gas flowing from the filter device;
• a straight pipe connected to a downstream side of the elbow pipe, the straight pipe extending in a direction intersecting an axial line of the outlet pipe of the filter device;
• an injector attached to the elbow pipe, the injector injecting the reductant aqueous solution into an inside of the elbow pipe toward the straight pipe;
• and
• a mixing pipe disposed in the elbow pipe to serve as a cover for the reductant aqueous solution injected from the injector, the mixing pipe being provided with a plurality of openings on a circumferential wall thereof,
• wherein a cutout is provided to a portion of the mixing pipe fixed with the elbow pipe at a position adapted to allow the exhaust gas flowing through the inlet of the elbow pipe to flow toward the injection nozzle of the injector.