Patents by Inventor Markus Hjerppe

Markus Hjerppe 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).

  • Propeller shaft bearing arrangement
    Patent number: 4795273
    Abstract: The invention relates to a method for preventing leaks in a propeller shaft bearing arrangement including a plain bearing (2), which is lubricated with oil or water and which supports the propeller shaft (1) extending through an opening in the body (4) of a hull, and packing members (6,7) for keeping the lubricant in the lubrication space and for preventing water from entering the bearing arrangement. According to the invention, the pressure vibrations occuring in the lubricant are equalized arranging, in the lubrication space, a medium possessing a high compressibility, which medium by means of changes in volume receives and equalizes said pressure vibrations.
    Type: Grant
    Filed: November 19, 1987
    Date of Patent: January 3, 1989
    Assignee: Oy Wartsila Ab
    Inventors: Torbjorn Henriksson, Kari Laukia, Heikki Sipila, Markus Hjerppe
  • Propeller shaft bearing arrangement
    Patent number: 4733976
    Abstract: The invention relates to a method for preventing leaks in a propeller shaft bearing arrangement including a plain bearing (2), which is lubricated with oil or water and which supports the propeller shaft (1) extending through an opening in the body (4) of a hull, and packing members (6,7) for keeping the lubricant in the lubrication space and for preventing water from entering the bearing arrangement. The pressure vibrations occuring in the lubricant are equalized by arranging, in the lubrication space, a medium prossesing a high compressiblility, which medium through changes in volume receives and equalizes said pressure vibrations.
    Type: Grant
    Filed: March 3, 1987
    Date of Patent: March 29, 1988
    Assignee: Oy Wartsila Ab
    Inventors: Torbjorn Henriksson, Kari Laukia, Heikki Sipila, Markus Hjerppe, Esa Rane