| 摘要 |
PROBLEM TO BE SOLVED: To attain the simplification of the device configuration of an undercarriage and the reduction of manufacturing cost thereof.SOLUTION: An undercarriage 2 has: front right side and rear right side drive units 64, 65 which cause the right side crawler frame 4 to move right and left upon the width expansion and contraction of the undercarriage 2 and cause the right side part of a track frame 3 to ascend and descend upon jack-up; and front left side and rear left side drive units 66, 67 which cause the left side crawler frame 5 to move right and left upon the width expansion and contraction of the undercarriage 2 and cause the left side part of the track frame 3 to ascend and descend upon jack-up. Front right side and rear right side actuators 69, 87 are configured to obtain a right side expansion and contraction state in which the right side crawler frame 4 is driven right and left and a right side elevation state in which the right side part of the track frame 3 is ascended and descended. Front left side and rear left side actuators 101, 110 are configured to obtain a left side expansion and contraction state in which the left side crawler frame 5 is driven right and left and a left side elevation state in which the left side part of the track frame 3 is ascended and descended.SELECTED DRAWING: Figure 1 |
