| 摘要 |
A cab rear extension beam (14) that is positioned in a front side to a heat exchanger (26) to support a rear side of said cab (28) is provided. The cab rear extension beam (14) includes a rising plate part (14A) that rises from a bottom plate (6), an upper horizontal plate part (14B) that is bent from an upper end of the rising plate part (14A) and extends to the rear side, and a space part (14C) that is formed of the rising plate part (14A) and the upper horizontal plate part (14B), and is formed in a reverse L-letter shape as a whole. A urea water tank (34) is formed with a vertical tank part (35) that is positioned in a rear side and extends in an upper-lower direction and a lateral tank part (36) that extends from a lower part of the vertical tank part (35) to the front side, and is formed in an L-letter shaped vessel as a whole. Besides, the lateral tank part (36) of the urea water tank (34) is disposed in the space part (14C) in the cab rear extension beam (14). |
| 主权项 |
1. A construction machine comprising:
an automotive lower traveling structure (2); an upper revolving structure (3) that is rotatably mounted on said lower traveling structure (2); and a front device (4) that is liftably mounted in a front part of said upper revolving structure (3), wherein said upper revolving structure (3) includes a revolving frame (5) that is configured as a support structure, a counterweight (24) that is positioned in a rear side to said revolving frame (5) to act as a weight balance to said front device (4), an engine (25) that is disposed on said revolving frame (5) in a laterally-facing state to be positioned in a front side to said counterweight (24), a heat exchanger (26) that is provided to be positioned in one side of said engine (25) in a length direction, a cab (28) that is provided on said revolving frame (5) to be positioned in a front side to said heat exchanger (26), a NOx purifying device (33) that is mounted in an exhaust pipe (25C) of said engine (25) and is provided with a urea selective reduction catalyst (33B) for removing nitrogen oxides in an exhaust gas by injection of urea water from a urea water injection valve (33D), and a urea water tank (34) that reserves urea water therein for supply to said urea water injection valve (33D) in said NOx purifying device (33), wherein said revolving frame (5) includes a flat bottom plate (6, 41), left and right vertical plates (7, 8) that are provided vertically on said bottom plate (6, 41) at an interval in a left-right direction to extend in a front-rear direction, a plurality of extension beams (9 to 14) that extend in the left-right direction from said bottom plate (6, 41) and said respective vertical plates (7, 8), and a left side frame (17) and a right side frame (18) that are mounted in front ends of said respective extension beams (9 to 14) to extend in the front-rear direction in outside positions of said bottom plate (6, 41) in the left-right direction, characterized in that: a cab rear extension beam (14) that is positioned in a front side to said heat exchanger (26) to support a rear side of said cab (28) among the plurality of said extension beams (9 to 14), is formed in a reverse L-letter shape with a rising plate part (14A) that rises from said bottom plate (6, 41), an upper horizontal plate part (14B) that is bent from an upper end of said rising plate part (14A) and extends to the rear side, and a space part (14C) that is formed between said rising plate part (14A) and said upper horizontal plate part (14B); said urea water tank (34) is formed in an L-letter shaped vessel with a vertical tank part (35) that extends in the upper-lower direction and a lateral tank part (36) that extends from a lower part of said vertical tank part (35) to the front side; and said lateral tank part (36) in said urea water tank (34) is disposed in said space part (14C) formed in said cab rear extension beam (14). |
