| 摘要 |
PURPOSE:To improve oscillation proof and soundproof peculiarities, by a method wherein a frame provided with a driver's seat is divided into two upper and lower frames and the upper frame on a driver's seat side is supported on the lower frame through oscillation proof rubber. CONSTITUTION:An upper slewing body frame 3 is divided into an upper frame 21 and a lower frame 22 and the upper frame 21 is supported on the lower frame 22 through oscillation rubbers 23. A driver's seat 4 is mounted on the front side of a standing frame 24 provided upright and higher than the upper frame 21, a sound insulation plate 7 dividing among a floor plate 10, the driver's seat 4 and an engine 6 constituting a floor surface of the driver's seat 4 is provided unitarily by sitting astride of the driver's seat 4 part and the standing frame 24 of the upper frame 21. As the floor plate of the driver's seat and the sound insulation plate are fixed unitarily an acoustic material to be mounted on the back of them can be sticked unitarily on the whole surface, through which transmission of a noise to the driver's seat can be prevented from occurring. |
