Patent ID: 7484394

Claim:
A gear roll-forming apparatus for roll-forming of a bevel gear capable of meshing with a bevel pinion, comprising: a pinion die that is substantially the same in configuration and size as the bevel pinion; a pinion die holder configured to support the pinion die so and to allow rotation of the pinion die about a first axis of the pinion die while substantially preventing movement of the pinion die in an axial direction of the pinion die from a small-diameter side toward a large-diameter side thereof; a gear die that is substantially the same in configuration and size as the bevel gear and meshes with the pinion die; and a press member configured to bring a bevel gear blank into press contact with the pinion die, the bevel gear blank configured to sandwich the pinion die in cooperation with the gear die and comprising a boss portion located on a second axis whose lower portion can be fitted into a mating hole formed in the gear die, wherein the gear die and the pinion die holder are relatively rotated about the second axis of the gear die, causing teeth of the pinion die to roll with respect to the bevel gear blank.