Patent ID: 8186156

Claim:
An automotive construction machine having a vehicle structure driven by a vehicle drive motor, a working mechanism operated by actuators mounted on said vehicle structure, an engine mounted on said vehicle structure to drive a hydraulic pump at the task of delivering pressurized oil, operating oil conduits for circulation of operating oil located between an oil pressure source—which is comprised of said hydraulic pump and an operating oil tank, and various actuators including said vehicle drive motor of said vehicle structure and actuators of said working mechanism through a control valve, a urea selective reduction catalyst provided in an exhaust pipe of said engine to get rid of nitrogen oxides, and a ureal water tank storing an aqueous urea solution to be injected into said exhaust pipe of said engine on the upstream side of said urea selective reduction catalyst, characterized in that: one of said operating oil conduits is routed to run along exterior surfaces of said ureal water tank; and heating said aqueous urea solution in said tank by heat radiation from pressurized oil or return oil in circulation through said operating oil conduit.