Gear train

Mechanical transmission using multiple gears / From Wikipedia, the free encyclopedia

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A gear train or gear set is a machine element of a mechanical system formed by mounting two or more gears on a frame such that the teeth of the gears engage.

Transmission_of_motion_by_compund_gear_train_%28Army_Service_Corps_Training%2C_Mechanical_Transport%2C_1911%29.jpg
Illustration from Army Service Corps Training on Mechanical Transport, (1911), Fig. 112 Transmission of motion and force by gear wheels, compound train.

Gear teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping, providing a smooth transmission of rotation from one gear to the next.[1] Features of gears and gear trains include:

Fotothek_df_tg_0000387_Bergwerk_%5E_Bergbau_%5E_Tretrad_%5E_Entw%C3%A4sserung_%5E_Taschen.jpg
An Agricola illustration from 1580 showing a toothed wheel that engages a slotted cylinder to form a gear train that transmits power from a human-powered treadmill to mining pump.

The transmission of rotation between contacting toothed wheels can be traced back to the Antikythera mechanism of Greece and the south-pointing chariot of China. Illustrations by the Renaissance scientist Georgius Agricola show gear trains with cylindrical teeth. The implementation of the involute tooth yielded a standard gear design that provides a constant speed ratio.

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