| 摘要 |
PURPOSE:To offset reaction torque produced along with excavation and to maintain torque balance, by a method wherein rotation and revolution excavating devices are disposed in juxtaposition with each other to the lower part of an excavator, and the one of the rotation directions thereof is extended in a reverse direction to that of the other. CONSTITUTION:Plural rotation and revolution excavators 32-38 are positioned in juxtaposition with each other to the lower part of an excavator, bits 32b, revolving in the same direction as that of revolution, are respectively coupled to the rotation and revolution excavators 32-38, and the rotation direction of the rotation and revolution excavators 32 and 38 is extended in a reverse direction to that of the rotation and revolution escavators 34 and 36. This causes the bit 32b to revolve in the same direction as that of rotation, resulting in the possibility to efficiently excavate even hard bedrock. The one of the rotation and revolution excavators 32 and 38 located on the outer side is turned in a reverse direction to that of the other to offset reaction torque. Further, the one of rotation and revolution excavators 34 and 36 on the inner side and the one of roller cutters 50 on both sides is turned in a reverse direction to that of the other, resulting in offset of the reaction torque.
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