{"data":{"fields":"term_definition","term_definition":"<div class=\"definition\">The distance between the center of the shaft of one spur gear to the center of the shaft of the other spur gear. In a spur gear drive having two equal gears, center distance is equal to the pitch diameter of the gears. The shortest distance between nonintersecting axes of mating gears. When applied to speed reducers, it is the distance between the centerlines of the input (high speed) shaft and the output (low speed) shaft. Shaft centerlines may be parallel or at right angles to each other. Center distance is often used to designate a single reduction worm gear speed reducer, such as 1.33\", 1.75\"<\/div>"}}