| 摘要 |
PROBLEM TO BE SOLVED: To enable a traveling motor of a lower structure to be electrically drive at low cost by utilizing an existing component such as a revolving bearing device.SOLUTION: An upper face part 25C of an inner ring 25 of a revolving bearing device 3 is provided with six circular ring-shaped annular electrodes 45A to 45F which are electrically connected to traveling motors 10L, 10R of a lower structure 2. A revolving super structure 4 is provided with a brush device 48 having a plurality of contact point members 52A to 52F which are electrically connected to an electric power storage device 21 and are brought into contact with the annular electrodes 45A to 45F in an electric conductive state. Thus, the contact point members 52A to 52F of the brush device 48 can be always made to slidingly contact the annular electrodes 45A to 45F, and accordingly the inner ring 25 of the existing revolving bearing device 3 can be utilized to electrically connect the traveling motors 10L, 10R with the electric power storage device 21. |
