Patent ID: 7644640

Claim:
An injection-molded resin bevel gear comprising: a boss having an axis hole; a web extending from an outer circumference side of the boss in an outward radial direction; and a teeth section positioned on an outward-radial-direction side of the web and extending in a substantial axial direction from an inner to an outer end; wherein, the teeth section has a ring-shaped rim-shaped section having substantially a same thickness along a bottomland which is substantially a same thickness as a thickness of the web, the outward-radial-direction side of the web is connected to an inner end of the ring-shaped rim-shaped section that is one end in a tooth-width direction of the teeth section, in the ring-shaped rim-shaped section, a section of the ring-shaped rim-shaped section to which the web is coupled to at said outer end that is an other end in the tooth-width direction is connected to an outward-radial-direction end of a plurality of evenly-placed first radial direction ribs extending so as to radiate from the outer circumference side of the boss in the outward radial direction and along a side surface of the web, in the ring-shaped rim-shaped section, a section positioned between adjacent first radial direction ribs and closer to the inner end than the section to which the first radial direction ribs are coupled at said outer end is connected to outward-radial-direction ends of second radial direction ribs projecting from said side surface of the web, an inner circumference of said ring-shaped rim-shaped section increases from said inner end to said outer end in an axial direction, and a thickness of the first radial direction ribs and the second radial direction ribs is formed thinner than the thickness of the web and the ring-shaped rim-shaped section such that a flow of molten resin during injection molding is led from the web to the teeth section.