Difference simple gear, compound gear and elliptical gear train

Simple gear train
Compound gear train
Elliptical gear train
Only one gear in each shaft and there is a relative motion between shaft axis. In this gear there is more than one gear on the shaft which is rigidly fix and mashed with the gear on another shaft forming gear train. The axis of shaft on which the gear are mounted may move relative to the fixed axis.
For large speed reduction, large size of gear is required. For large speed reduction the small gear ratio is required. For large speed reduction in high velocity moderate size gear is required.
Simple gear train

Simple gear train

Compound Gear

Compound Gear

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