LOAD EQUALIZING POWER TONG GEAR TRAIN

摘要

An improved power tong gear train which includes a ring gear having an open or closed throat. At least three idler gears are positioned such that at least two of the idler gears engage the ring gear through the ring gear's entire range of rotation. The gear train further has at least one stage of reduction gears engaging the idler gears and has a power gear transferring torque to a stage of the reduction gears. Also disclosed is a power tong gear train having a load equalizing gear. The gear train includes a ring gear which has at least one idler gear engaging the ring gear. At least one stage of reduction gears engages the idler gears and a power gear transfers torque to a stage of the reduction gears. A load equalizing mechanism is attached to at least one of the gears.