| 摘要 |
The present invention provides an excavator with lightweight boom and arm which quickens working device speed, turning speed, and running speed and improves working speed and fuel efficiency by making the whole boom and arm equipped in the excavator of a synthetic resin, instead of structural steel, preventing fatigue failure of an existing welded structure, and reducing total weight of the excavator. Also, the excavator is quickly and easily produced and the productivity and workability are increased by producing the boom and the arm in an injection molding type. |
