{"data":{"fields":"term_definition","term_definition":"<div class=\"definition\">The contact ratio in the transverse plane. It is the ratio of the angle of action to the angular pitch. For involute gears, it is most directly obtained as the ratio of the length of action to the base pitch. Transverse Contact Ratio, formerly known as Profile Contact Ratio, is the ratio of the arc of action to the circular pitch or the length of action to the base pitch measured in the transverse section. For smooth continuous transmission of motion, the depth of the tooth profiles must be sufficient to insure that one pair of profiles are in engagement until the following pair come into contact. Although a Transverse Contact Ratio of unity is theoretically acceptable a value of 1.2 or greater is more desireable. The design values that may be changed to increase the Transverse Contact Ratio are decreasing the pressure angle to cause an increase in the arc of action. Decreasing the circular pitch (finer Pitch) will also cause an increase.<\/div>"}}