HELICAL GEAR AND POWER TRANSMISSION DEVICE

摘要

An external-periphery side surface (24b) has a first side surface region (24b1) in which the distance (W2) positioned at the distalmost end side of a helical gear (21) in the rotational direction (R1) is set to be greater than the distance (W1) positioned at the trailing end side, in regard to the radial distance of a rotating shaft from a hub part (22a) of a rim part (22c) to the external-periphery side surface (24b).