| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiple cutter driving apparatus which individually drives first to n-th cutter sections obtained by radially concentrically dividing a cutter, wherein the multiple cutter driving apparatus facilitates supply of oil pressure and electricity to the first cutter section arranged on the outermost periphery of the cutter. SOLUTION: The cutter rotatably arranged at a front portion of an excavator main body 4 is radially concentrically divided into the first cutter section 5 and the second cutter section 6, and a first support member 8 and a second support member 17 are arranged on the outer first cutter section 5 and the inner second cutter section 6, respectively. Then, a first bearing 13 for axially supporting the first support member 8 and a first driving motor 15 for rotatively driving the first support member 8 are arranged on the excavator main body 4, and a second bearing 19 for axially supporting the second support member 17, and a second driving motor 23 for rotatively driving the second support member 17 are arranged on the first support member 8. Further, a rotary joint 25 for supplying oil pressure and electricity is arranged at least at a rotary center of the first support member 8 out of the first and second support members 8, 17, while allowing relative rotation between the first and second support members. |
