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ball differential
A ball differential is a type of differential typically used on radio-controlled cars. It differs from a geared differential by using several small ball bearings rotating between two plates, instead of bevel gears.
== History ==
The first ball differential for Radio-controlled Cars was designed by Cecil Schumacher, a British motor sport engineer. Although a patent was applied for, it was denied as the idea had already been implemented into a lawn mower. Radio-controlled cars were still a new application for the ball differential and Cecil Schumacher is generally considered the modern day inventor of the concept. Such was the popularity of the ball differential, originally applied in 1/12 on-road cars that Cecil Schumacher formed a company, Schumacher Racing Products.
To this date ball differentials remain very popular in the radio-controlled car market. They are used on almost every 1/12 on-road, scale touring car(although the sealed gear differential is gaining popularity in this class) and electric off-road produced by many manufacturers. In these classes they are regarded as the industry standard. Schumacher Racing Products even use ball differentials on their nitro truck range, these however use strong materials and larger and harder ball bearings.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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