Several different types of internal gear pump designs exist, but only the gerotor (contraction of the words, “generated rotor”) has achieved wide commercial adoption in hydraulic fluid-power applications. Early attempts date to efforts by Galloway in 1787, with others adding to its development in the intervening centuries. W. H. Nichols was the first to develop gerotor mass-production techniques back in the 1920s. Eventually, a family of pumps and motors grew up around the basic
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