| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction machine capable of keeping a full capacity volume of a urea solution tank constant regardless of a tilt direction thereof and preventing the urea solution tank from being damaged even when urea solution freezes.SOLUTION: A urea solution tank 107 has an inlet 171b in a center of an upper face 171a of a tank body 171. A pipe body 172 is suspended in the tank body 171 with one edge thereof connected to a periphery of the inlet 171b. The pipe body 172 has larger specific gravity than urea solution A and is adapted to permanently direct a lower edge thereof toward vertically below under own weight thereof. A length 172L of the pipe body 172 is decided in a manner that keeps a space S, to allow the urea solution A to expand when the same freezes, between the lower edge of the pipe body 172 and an inner upper face 171e of the tank body 171 with the tank body 171 horizontally placed. An exhaust valve is opened when pressure in the tank body 171 exceeds hydraulic head pressure in the pipe body 172 when the same is filled with the urea solution A.SELECTED DRAWING: Figure 3 |
