Driving-force transmitting device and image forming apparatus

摘要

A driving-force transmitting device includes a driving-side joint portion that couples to a receiving-side joint portion provided at an end of a rotatable body and transmits a rotational driving force of a driving source. The driving-side joint portion and the receiving-side joint portion are a pair of involute spline joints including an external gear and an internal gear, a number of teeth of one of the gears being smaller than a number of teeth of the other gear.

主权项

1. A driving-force transmitting device comprising:
a driving-side joint portion that couples to a receiving-side joint portion provided at an end of a rotatable body, wherein the driving-side joint portion is configured to transmit a rotational driving force of a driving source, wherein the driving-side joint portion and the receiving-side joint portion are a pair of involute spline joints including an external gear and an internal gear, a number of teeth of one of the gears being smaller than a number of teeth of the other gear, and wherein the involute spline joints are configured such that the one of the gears that has the smaller number of teeth is obtained by removing N teeth, where N is an integer of 1 of more, from a gear having the same number of teeth as the number of teeth of the other gear, the N teeth being evenly arranged in the circumferential direction.