MACHINE BODY AND WORK MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a machine body which is low in cost, saves space and can cool only a necessary section of an exhaust gas purification device.SOLUTION: An exhaust gas purification device 22 comprises: an injector 29 which injects urea water as liquid reducing agent supplied from a reducing agent supply device through a urea water hose 34 serving as reducing agent supply piping; a NOx sensor 30 which detects a concentration of nitrogen oxide in exhaust gas; and a wind trunk body 35 which has an inlet side opening and an outlet side opening to allow cooling air taken in from an outside of a machine room 19 to cool at least either one of the urea water inside the urea water hose 34, the NOx sensor 30 or the injector 29. The inlet side opening of the wind trunk body 35 is communicated with a ventilation port 26 opening to the outside of the machine room 19. Air in the wind trunk body 35 is forcibly discharged through the outlet side opening of the wind trunk body 35 using negative pressure around an exhaust gas flow generated by an ejector 51 installed in an exhaust pipe passage 24.