To Brush or Not to Brush? by ProQuest

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Bosch was first to respond, with the brand new "Long Haul" alternator, which improves service life over the existing brush technology. This meant improving brush life. Two innovations resultedsmaller slip ring diameters to allow space for longer brushes, slower relative speed, and proprietary slip ring alloys to reduce wear. Bearings rated to 18,000 rpm and proprietary lubricants were also employed to contribute to longer life.

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