Importance

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Abstract

In a step-up gear drive mechanism, three gear trains are provided between an input shaft and an output shaft to share the torque transmitted between the input shaft and the output shaft. Each gear train comprises a pinion gear meshing with a central drive gear and mounted on a gear shaft. An output drive gear is threadably mounted on each gear shaft and positioned to mesh with the central output gear. The input drive gear is coaxially mounted on the input drive shaft and the pinion gears support the central drive gear and the distal end of the input drive shaft. The output gear is coaxially mounted on the output drive shaft and the output drive gears support the output gear and the proximal end of the output drive shaft. Collars are threadably mounted on the gear shafts to frictionally engage the output drive gears tending to fix the angular position of the output drive gears on the gear shafts. Set screws are threadably mounted in the collars and are arranged to engage the output drive gears to enable the output drive gears to be fastened more tightly to the gear shafts. To achieve torque equalization the output drive gears are loosely engaged by the collars, the input shaft of the drive mechanism is locked in position, and the output drive shaft is rotated in the reverse direction. This action will cause some of the output drive gears to slip in angular position on the gear shafts so as to equalize the torque transmission through the gear trains. The collars are then fully tightened against the output drive gears and the set screws are tightened against the output drive gears to fasten the output drive gears in position.

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First Claim