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Wikipedia definition
1. Friction driveA friction drive or friction engine is a type of transmission that, instead of a chain and sprockets, uses 2 wheels in the transmission to transfer power to the driving wheels. This kind of transmission is often used on scooters, mainly go-peds, in place of a chain. The problem with this type of drive system is that they are not very efficient. Since the output wheel (leather covered wheel) has width, the area of contact is spread across various radii on the primary disc.
Read “Friction drive” on English Wikipedia
Read “フリクションドライブ” on Japanese Wikipedia
Read “Friction drive” on DBpedia

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