{
  "$type": "site.standard.document",
  "description": "A piston for a combustion engine has at least one ring groove for receiving a piston ring, wherein the ring groove has a piston skirt side lower groove flank which is further away from a piston head than a piston head side upper groove flank of the ring groove, wherein a pattern of recesses is…",
  "path": "/patents/974339",
  "publishedAt": "2014-05-28T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02F3/00",
    "WÄRTSILÄ SWITZERLAND LTD [CH]"
  ],
  "textContent": "A piston for a combustion engine has at least one ring groove for receiving a piston ring, wherein the ring groove has a piston skirt side lower groove flank which is further away from a piston head than a piston head side upper groove flank of the ring groove, wherein a pattern of recesses is formed in said lower groove flank for accumulating a lubricant. Each recess has a discrete internal volume which is separated from the internal volume of adjacent recesses and has a single opening at its top. Variations of this arrangement are described, in which either one or both of either of the ring groove flanks and the piston ring flanks is provided with a pattern of recesses.",
  "title": "Piston for combustion engine"
}