JPS6458830A - Pitch setting method for timing belt - Google Patents

Abstract

PURPOSE:To reduce the resonance and noise of a timing belt, prevent skip of meshing and maintain proper meshing, by making a pitch of the timing belt equal to a length defined by dividing an arc formed by a center line of a tension member wrapped around a pulley by segments extending from a center of the pulley through the bottoms of adjacent teeth of the pulley. CONSTITUTION:Assuming that B denotes a distance between a center line A of a tension member 51 forming a core of a timing belt 50 and an outer surface of a canvas 53, the center line A of the tension member 51 describes an arc having a radius obtained by adding the distance B to a radius of a driving pulley 2. Assuming that C and D denote segments extending from a center 2b of the driving pulley 2 through bottoms 2a of adjacent teeth of the pulley 2, and that E denotes a length defined by dividing the arcuate center line A by the segments C and D, and that a PLD value of the timing belt 50 is represented by B, a pitch of the timing belt 50 is set to be equal to the length E. Thus, the pitch of the timing belt 50 is set according to a change in B corresponding to the PLD value without changing a pitch F of the driving pulley 2.