Patents by Inventor Tsu P. Shyu

Tsu P. Shyu 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).

  • Side and gap sealed oil ring
    Patent number: 5603512
    Abstract: An oil control ring assembly having a sealing ring and a scraping is disposed within a groove in a piston. The scraping ring assembly has a scraping end portion and spaced apart ends defining a gap. The sealing ring has a sealing end portion and mated spaced apart radially stepped ends defining a stepped gap. The sealing end portion is connected to the scraping end portion and the stepped gap on the sealing ring is offset from the gap on the scraping ring. A spring applies a radial force to the scraping ring which urges the end portion of the scraping ring into engagement with the cylinder wall and a reaction force moment about the end portion forces the end portion of the of the seal ring into contact with an upper surface of the groove. The oil control ring assembly simultaneously provides for side and gap sealing.
    Type: Grant
    Filed: July 1, 1996
    Date of Patent: February 18, 1997
    Assignee: Caterpillar Inc.
    Inventors: Keith E. Lawrence, Tsu P. Shyu, Donald J. Waldman, Ross P. Wietharn
  • Side and gap sealed oil ring
    Patent number: 5564699
    Abstract: An oil control ring assembly having a sealing ring and a scraping is disposed within a groove in a piston. The scraping ring assembly has a scraping end portion and spaced apart ends defining a gap. The sealing ring has a sealing end portion and mated spaced apart radially stepped ends defining a stepped gap. The stepped gap on the sealing ring is offset from the gap on the scraping ring. A spring positioned between an inner wall of the groove and the scraping ring biases the scraping ring at a specified tension. An alignment wire maintains misalignment between the stepped gap and the gap.
    Type: Grant
    Filed: February 15, 1995
    Date of Patent: October 15, 1996
    Assignee: Caterpillar Inc.
    Inventors: Keith E. Lawrence, Tsu P. Shyu, Donald J. Waldman, Ross P. Wietharn
  • Engine combustion system
    Patent number: 5237976
    Abstract: An arrangement in a single housing positioned over a piston cylinder of an engine of independently operable "on-off" valve actuators, "on-off" valves, hydraulic fluid headers and rails, engine intake and exhaust valves, and unit fuel injector.
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: August 24, 1993
    Assignee: Caterpillar Inc.
    Inventors: Keith E. Lawrence, Tsu P. Shyu
  • Apparatus for adjustably controlling valve movement and fuel injection
    Patent number: 5237968
    Abstract: An apparatus adjustably controls intake and exhaust valve movement and fuel injection of an engine. Valve movement and injection is adjustably controlled in response to electrical signals delivered to a piezoelectric motor which in turn delivers hydraulic signals through a single spool valve.
    Type: Grant
    Filed: November 4, 1992
    Date of Patent: August 24, 1993
    Assignee: Caterpillar Inc.
    Inventors: Charles R. Miller, Tsu P. Shyu, J. Roger Weber
  • Apparatus for adjustably controlling valve movement and fuel injection
    Patent number: RE35303
    Abstract: An apparatus adjustably controls intake and exhaust valve movement and fuel injection of an engine. Valve movement and injection is adjustably controlled in response to electrical signals delivered to a piezoelectric motor which in turn delivers hydraulic signals through a single spool valve.
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: July 30, 1996
    Assignee: Caterpillar Inc.
    Inventors: Charles R. Miller, Tsu P. Shyu, J. Roger Weber