Abstract
Analysis of the transmission error of a helical gear pair proved that the effective contact ratio can be an index of the loaded transmission error. The effective contact ratio is defined as the ratio of the rotational angle of a tooth pair to the angular pitch during the period in which the point of contact is located on the tooth surface. Since tooth pairs in edge contact contribute only slightly, the effective contact ratio neglects the period of edge contact. A gear pair with higher effective contact ratio results in smaller transmission error under applied loads with which the actual contact ratio exceeds the effective contact ratio. Consequently, gear dimensions affect the transmission error in this load range. Since this new index is based on the path of contact, both gear dimensions and tooth surface modifications affect this ratio.
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