| 摘要 |
A relatively large diameter gear in a cyclic motion generating mechanism is finished and assembled into the mechanism in a manner such that, although the gear may not be precisely truly circular, binding or interference with a meshed gear is eliminated while zero backlash exists at the cycle end position of the gear. After the teeth are formed on the gear blank, a series of diametral measurements to locate one position at which the maximum diameter intersects the pitch circle. A radius from this point of intersection larger than the designed radius of the pitch circle is then employed to locate a center of the blank about which the central opening is subsequently machined to establish the rotational axis of the finished gear. This axis is so located that when the gear is assembled into the mechanism in mesh with the input gear of the gear box, zero backlash will exist between these two gears when the point from which the center radius was determined is in mesh, and the radial distance from the center of rotation of the gear to its pitch circle at this point is greater than a radius to any other point on the pitch circle.
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