| 摘要 |
<p>A hydrophilic film coating (11) is formed on outer surfaces of cab (5), equipment housing cover (6) and counterweight (7) of an upper rotary body (2), so that a water film (18) is formed on the surface of the hydrophilic film coating by raindrops or at the time of rainfall. By formation of the water film (18), contaminant substances (13) which have deposited on the outer surfaces of the upper rotary body (2) are urged to float up and carried away with dripping water of the water film (18). As a consequence, it becomes possible to prevent development of raindrop stains on the outer surfaces of the upper rotary body (2) and, even if spattered particles of grease have deposited on the outer surfaces of the upper rotary body (2), such contaminants can be easily washed off, thereby permitting to maintain the quality in outer appearance of the upper rotary body (2). <IMAGE></p> |
