Patents Examined by William Battista, Jr.
  • Compact camshaft phasing drive
    Patent number: 5163872
    Abstract: A variable camshaft phaser (VCP) has lash take up drive piston assemblies with inner and outer helical splines for phase changing and return springs mounted in pockets in the pistons to shorten overall length for a compact unit and also relieve lash take-up friction on the piston return strokes. Numerous other features are included. A three-way feed-discharge valve limits oil flow to that necessary to operate the drive pistons for phasing.
    Type: Grant
    Filed: September 5, 1991
    Date of Patent: November 17, 1992
    Assignee: General Motors Corporation
    Inventors: Michael J. Niemiec, Thomas H. Lichti, Michael E. McCarroll, Kenneth A. Kovacevich