{"data":{"fields":"term_definition","term_definition":"<div class=\"definition\">Annular, or internal, gears can have either spur or helical configurations. The pitch diameter of the external gear should not be larger than two-thirds that of the internal gear for maximum efficiency. These gear combinations offer a reduction in center distance and are most useful where space in an assembly is limited. In addition, the internal gear serves as a protective cover over its mate.<\/div><div class=\"align align-image align-left\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"><img src=\"https:\/\/www.gleason.com\/images\/zNsJ42.b4e3\/544w\/ED-87a.jpg\" alt=\"ED-87a\"><\/div><div class=\"align align-image align-left\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"><img src=\"https:\/\/www.gleason.com\/images\/zNsJ42.b4e3\/544w\/ED-87a.jpg\" alt=\"ED-87a\"><\/div><div class=\"align align-image align-left\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"><img src=\"https:\/\/www.gleason.com\/images\/zNsJ42.b4e3\/544w\/ED-87a.jpg\" alt=\"ED-87a\"><\/div><div class=\"align align-image align-left\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"><img src=\"https:\/\/www.gleason.com\/images\/zNsJ42.b4e3\/544w\/ED-87a.jpg\" alt=\"ED-87a\"><\/div>"}}