| 摘要 |
PURPOSE: A toothed gear is provided to reduce the weight by manufacturing the bridge area of the toothed gear with pressing or forging, and to prevent distortion in heat treatment by arranging bridges like spokes. CONSTITUTION: A toothed gear is composed of an outer toothed rim(1), a hub(3) and a bridge area(2) connecting the toothed rim to the hub as one piece. The bridge area is connected to the toothed rim and the hub in different planes. The bridge area is composed of uniformly spaced spoke-like bridges, and spoke bridges are uniformly distributed over the circumference. The bridges are arranged alternately on both sides of the center plane extending through the toothed gear. Distortion is prevented with arranging plural spoke-like bridges in heat treating blanks for the toothed gear, and material is reduced with forming individual spokes in the bridge area with the adequate strength. |
