Segmented Patents (Class 277/487)
  • Patent number: 12038089
    Abstract: A piston ring includes a plurality of first ring pieces placed inside the ring groove in a stacking manner such that the first ring pieces adhere to each other in the axis direction. The first ring pieces include respective piston ring gap portions each having end surfaces separated from each other in the circumferential direction of the first ring pieces such that the end surfaces face each other via a ring gap having a predetermined dimension. The respective piston ring gap portions of the first ring pieces are displaced from each other in the circumferential direction. A closing member is provided to close the piston ring gap portions of the first ring pieces in the radial direction of the first ring pieces.
    Type: Grant
    Filed: May 23, 2022
    Date of Patent: July 16, 2024
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takashi Koyama, Takashi Suzuki, Naoki Tsuneishi, Minoru Uchiyama, Yuzuru Shiratori, Yuuichiro Wada
  • Patent number: 11326694
    Abstract: A piston ring set of a cryogenic pump includes a first piston ring and a second piston ring which are dissimilarly shaped and cooperatively shaped to form a hollow cylindrical shape when in abutment to one another. The first piston ring is C-shaped and defines a middle portion disposed between a first end portion and a second end portion. A piston ring gap is disposed between a first distal end of the first end portion and a second distal end of the second end portion. When the first piston ring is in abutment with the second piston ring forming the hollow cylindrical shape, the second piston ring does not extend along the middle portion of the first piston ring while the second piston ring does extend along the first end portion and second end portion of the first piston ring.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: May 10, 2022
    Assignee: ACD, LLC
    Inventor: Joshua Wayne Steffen
  • Publication number: 20140035235
    Abstract: A three-piece oil control ring is provided for use in a piston groove of an internal combustion engine. The ring comprises a first annular segment and a second annular segment, associated to an expanding element. The expander has a substantially annular shape and comprises a first end facing the internal wall of the groove when the ring is mounted on the piston and a second opposite end. The ring further comprises an intermediate portion having at least one protrusion for association with the segments. Still further, the first end exhibits first thickness value (E1), the second end exhibits second thickness value (E2) and the substantially intermediate portion exhibits third thickness value (E3), wherein the value of (E1) is substantially lower than the value of (E3) and lower or similar to the value of (E2), the difference between (E1) and (E3) being substantially higher than that between (E1) and (E2).
    Type: Application
    Filed: July 26, 2013
    Publication date: February 6, 2014
    Applicants: MAHLE International GmbH, MAHLE Metal Leve S/A
    Inventors: Andre Ferrarese, Rafael Antonio Bruno
  • Patent number: 8177237
    Abstract: A segmented piston ring assembly includes piston ring segments 2 having stepped ends 5, 6, at least one piston ring segment 2 including a radial step on a radially inner peripheral surface 9 over a part of the width of the piston ring segment 2, and a single-cut sealing ring 3, which bears radially against the inside of the peripheral surface 9 of the piston ring segments 2, the sealing ring 3 including an axial recess 10, 12 which cooperates with the radial step 4 of the piston ring segment 2 to prevent relative rotation therebetween.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: May 15, 2012
    Assignee: Hoerbiger Kompressortechnik Holding GmbH
    Inventors: Tino Lindner-Silwester, Christian Hold, Martin Molnar