Construction machine

A construction machine comprising:

• an engine that is oriented so that an axial direction of a crankshaft is parallel with a front-and-rear direction of a vehicle body;
• and
• an exhaust gas aftertreatment device that is provided to an upper portion of the engine in an engine compartment covered by a hood, the exhaust gas aftertreatment device comprising at least one pair of a first aftertreatment unit and a second aftertreatment unit into which exhaust gas from the engine dividedly flows, the first aftertreatment unit and the second aftertreatment unit each comprising:
• a first exhaust gas emission control system that is provided upstream in a flow direction of the exhaust gas;
• a second exhaust gas emission control system that is provided downstream of the first exhaust gas emission control system;
• and
• a communication pipe through which the first exhaust gas emission control system and the second exhaust gas emission control system are in communication with each other, the first and second exhaust gas emission control systems, while being arranged side by side in a right-and-left direction of the vehicle body, being oriented so that the flow direction of the exhaust gas flowing in the first and second exhaust gas emission control systems is parallel with the front-and-rear direction of the vehicle body, and the communication pipe being provided between the first exhaust gas emission control system and the second exhaust gas emission control system,
• wherein the first exhaust gas emission control system of the first aftertreatment unit and the first exhaust gas emission control system of the second aftertreatment unit are spaced from each other in the right-and-left direction of the vehicle body,
• wherein the second exhaust gas emission control system of the first aftertreatment unit and the second exhaust gas emission control system of the second aftertreatment unit are provided between the first exhaust gas emission control system of the first aftertreatment unit and the first exhaust gas emission control system of the second aftertreatment unit,
• wherein when the exhaust gas aftertreatment device is seen in the front-and-rear direction of the vehicle body, an outer linear envelope that is tangent to the first exhaust gas emission control system and the communication pipe of each of the first aftertreatment unit and the second aftertreatment unit extends upward while tilting toward a right-and-left center of the engine, and
• wherein a slant surface along the envelope is provided to the hood at a position corresponding to:
• a portion facing an external portion of an outer circumferential surface of the communication pipe of each of the first aftertreatment unit and the second aftertreatment unit, and a portion facing an external portion of an outer circumferential surface of the first exhaust gas emission control system of each of the first aftertreatment unit and the second after treatment unit.