{
  "$type": "site.standard.document",
  "description": "A piston ring (34,36) for use in a piston ring pack in an annular ring groove (33) in the sidewall of a piston (10) of a large two-stroke turbocharged uniflow-scavenged internal combustion engine with crossheads to seal against the pressure in the combustion chamber (32). The piston ring (34,36)…",
  "path": "/patents/1414280",
  "publishedAt": "2023-10-25T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02B25/04",
    "MAN ENERGY SOLUTIONS FILIAL AF MAN ENERGY SOLUTIONS SE TYSKLAND [DK]"
  ],
  "textContent": "A piston ring (34,36) for use in a piston ring pack in an annular ring groove (33) in the sidewall of a piston (10) of a large two-stroke turbocharged uniflow-scavenged internal combustion engine with crossheads to seal against the pressure in the combustion chamber (32). The piston ring (34,36) comprises a ring body (50) with first- and second side faces (46,47) axially distanced by a ring height (Hr), an outer circumferential face (41) extending axially over the ring height (Hr), an inner circumferential face (42), and first- and second end portions (38,39) at a ring partition that allows expansion and contraction of the piston ring (34,36). A first transition between the outer circumferential face (41) and the first side face (46) is rounded, a second transition between the outer circumferential face (41) and the second side face (47) is rounded. A medial portion of the axial extent of the outer circumferential face (41) has a first hardness. A first peripheral portion of the axial extent of the outer circumferential face (41) that extends from the medial portion to the first transition has a second hardness. A second peripheral portion of the extent of the outer circumferential face (41) that extends from the medial portion to the second transition has the second hardness, and the first hardness is greater than the second hardness. Said first peripheral portion extends axially over a first height (HI) and is formed by material of the ring body (50), and said second peripheral portion extends axially over a second height (H2) and is formed by material of the ring body (50).",
  "title": "PISTON RING WITH HARD COATING"
}