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Gear
A machine element used to transmit motion between rotating shafts when the centre distance of the shafts is not too large. Toothed gears provide a positive drive, maintaining exact velocity ratios between driving and driven shafts, a factor that may be lacking in the case of friction gearing which is subject to slippage. While the motion transmitted to mating gears is kinematically equivalent to that of rolling surfaces identical with the gear pitch surfaces, the action of one gear tooth on another is generally a combination of rolling and sliding motion. When the distance between shafts is large, other methods of transmission are used.
- Part of Speech: noun
- Synonym(s):
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- Industry/Domain: Science
- Category: General science
- Company: McGraw-Hill
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