Patents Assigned to Mahle Metal Level S/A
  • Piston ring for an internal-combustion engine, a method for coating a piston ring, and an internal-combustion engine
    Patent number: 10724637
    Abstract: A piston ring may include a drawn metal base of constant thickness having an outer peripheral surface. The piston ring may also include a hard coating disposed on the outer peripheral surface. The coating may have a thickness that is greater in a region of two butt ends of the base than a thickness of the coating in another region of the outer peripheral surface. The coating may be defined by a plurality of layers with a nanoscale structure.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: July 28, 2020
    Assignees: Mahle Metal Level S/A, Mahle International GmbH
    Inventor: Paulo Jose Da Rocha Mordente