Patent ID: 8167750

Claim:
A resin pulley comprising: an outer cylindrical portion including an outer circumferential surface on which a belt is to be wound; an inner cylindrical portion which is disposed radially inwards of and concentrically with the outer cylindrical portion; and a plurality of ribs connecting an inner circumferential surface of the outer cylindrical portion and an outer circumferential surface of the inner cylindrical portion, wherein the outer cylindrical portion, the inner cylindrical portion and the ribs are formed integrally from a resin material, wherein the ribs are provided so as to be inclined towards a circumferential direction relative to a radial imaginary line as viewed in an axial direction, and wherein radially outer end portions of the ribs are formed such that inclination angles of the respective radially outer end portions relative to the radial imaginary line are greater than inclination angles of respective radially intermediate portions of the ribs relative to the radial imaginary line, and radially inner end portions of the ribs are formed such that inclination angles of the respective radially inner end portions relative to the radial imaginary line are greater than the inclination angles of the respective radially intermediate portions of the ribs relative to the radial imaginary line.