Patents by Inventor Ningxin Chen

Ningxin Chen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus and method for precision grinding face gear
    Patent number: 6146253
    Abstract: A precision grinding apparatus includes a grinding worm for precision grinding a case-hardened face gear. A shaper is first placed into contact with a face gear, to thereby shape a surface of the face gear into a plurality of face gear teeth. The shaper is then removed, and the face gear is case hardened. The grinding worm is disposed in a normal orientation to the case-hardened face gear and includes a spiral tooth extending along a perimeter of the grinding worm. The spiral tooth of the grinding worm is adapted to contact and precision grind the case-hardened gear. A dressing tool includes a protrusion for contacting the spiral tooth of the grinding worm, as the spiral tooth contacts and precision grinds the case-hardened face gear. The dressing tool thus maintains the shape of the grinding worm to within a desired tolerance range.
    Type: Grant
    Filed: April 18, 1997
    Date of Patent: November 14, 2000
    Assignee: McDonnell Douglas Helicopter Company
    Inventors: Faydor L. Litvin, Yih-Jen Chen, Gregory F. Heath, Vijay J. Sheth, Ningxin Chen