NOx reducing device

摘要

Provided is a NOx reducing device which is capable of effectively protecting a NOx controller against heat and water, while suppressing an increase in cost of a construction machine and deterioration in assemblability of the NOx controller. The NOx reducing device comprises a device body, a tail pipe provided at an outlet end portion of the device body, a NOx controller, and a mount table supporting the device body. The mount table comprises a top plate and a leg supporting the top plate. The device body and the tail pipe are provided on an upper side of the top plate. The NOx controller is provided with respect to a lower surface of the top plate in such a manner that the NOx controller is entirely covered from thereabove by the top plate.

主权项

1. A construction machine comprising:
an engine; a hydraulic pump; and a NOx reducing device serving as an exhaust gas aftertreatment device for treating exhaust gas from the engine to decrease NOx in the exhaust gas by using an aqueous urea solution, wherein the NOx reducing device comprises: a device body configured to allow execution of a urea-based selective catalytic reduction reaction for the NOx, the device body having an outlet end portion; a tail pipe provided at the outlet end portion; a NOx sensor configured to detect an amount of NOx in the exhaust gas; a NOx controller receiving a signal from the NOx sensor; and a mount table which supports the device body and which is arranged to stride over the hydraulic pump, the mount table comprises a top plate and a leg supporting the top plate, the device body and the tail pipe are provided on an upper side of the top plate, the top plate is interposed between the hydraulic pump and the device body in an up-and-down direction, and the NOx controller is provided with respect to a portion of a lower surface of the top plate in such a manner that the NOx controller is entirely covered from thereabove by the top plate, and disposed at a position away from the hydraulic pump and the device body in a direction perpendicularly intersecting the up-and-down direction.