To improve a drive tumbler used for a large size crawler used in a self-traveling type lift crane or the like, and a manufacturing method and a utilization method for a crawler itself.
A combination of the drive tumbler 100 and the track 50 includes a plurality of connected track shoes 52 and a plurality of driven surfaces. The track is wrapped around the drive tumbler such that a plurality of shoes are contacted with the drive tumbler. The drive tumbler is provided with: a plurality of drive surfaces; and a peripheral rim surface including a plurality of shoe contact surfaces in which each of them contacts inside surface of one of the track shoes that are in contact with the tumbler. The shoe contact surface has a shape such that a line perpendicular to the tangent of the shoe contact surface does not pass through the axis of rotation of the drive tumbler. Thereby, the shoe contact surface of the rim of the drive tumbler can transmit tractive force to the track.
ZICK JOEL D
PORUBCANSKY KENNETH J
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