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Elliptical Gears
An ellipse is defined by a set of points in a plane, such that the sum of the distances from two fixed points  the foci  to any point in the set is a constant. This enables elliptical gears cut about their foci to run at a constant center distance. The velocity ratio resulting from elliptical gears varies between 1/K and K during one cycle of speed change, where K is the maximum gear ratio. Multilobe gears can be derived from unilobe gears. In appropriate situations, elliptical gears may be cascaded to obtain varying speedchange characteristics, giving an effective ratio of from 1 to K^2 . Bilobe gears (oval gears) have been used in flowmeters and pumps. Using precision elliptical bilobe gears, flowmeters can have good linearity over a wide range of flow rates and viscosities
