DRIVE TUMBLER, TRACK DRIVE, AND TRACK CONNECTION AND TENSIONING SYSTEM.

摘要

A combination of a drive tumbler (100) track (50) includes a track (50) made of a plurality of connected track shoes (52) and a plurality of driven surfaces. The track (50) wrapped around the drive tumbler (100) so that a plurality of the shoes (52) are in contact with the drive tumbler (100). The drive tumbler (100) has a plurality of drive surfaces (132) and a circumferential rim surface that includes a plurality of shoe contact surfaces (138) that each contact the inside surface of one of the track shoes (52) that are in contact with the tumbler (100). The shoe contact surface (138) has a shape such that a line (103) normal to the tangent (107) of the shoe contact surface (138) does not pass through the axis of rotation of the drive tumbler (100), thereby allowing the shoe contact surfaces on the rim of the drive tumbler (100) to transmit a tractive force to the track (50). A preferred drive tumbler (100) comprises a center hub (110) and a plurality of individual tooth members (130) connected to the center hub (110) by welds.