{
  "$type": "site.standard.document",
  "description": "An internal combustion engine (100) includes a piston (40) formed of an aluminum alloy; and a cylinder block (10) including a cylinder wall 12 including a sliding surface (12a), along which the piston is slidable. The cylinder block is formed of an aluminum alloy containing silicon, and includes a…",
  "path": "/patents/1398203",
  "publishedAt": "2025-09-10T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02F1/18",
    "YAMAHA MOTOR CO LTD [JP]"
  ],
  "textContent": "An internal combustion engine (100) includes a piston (40) formed of an aluminum alloy; and a cylinder block (10) including a cylinder wall 12 including a sliding surface (12a), along which the piston is slidable. The cylinder block is formed of an aluminum alloy containing silicon, and includes a plurality of primary-crystal silicon grains (2) at the sliding surface. The sliding surface has a ten-point average surface roughness Rz of 0.5 µm or smaller, and the plurality of primary-crystal silicon grains at the sliding surface have a crushing ratio of 200 or lower.",
  "title": "INTERNAL COMBUSTION ENGINE AND TRANSPORTATION DEVICE"
}