{
  "$type": "site.standard.document",
  "description": "An internal combustion engine (100) includes a piston (40) formed of an aluminum alloy, the piston including a piston head (43) and a piston skirt (44) extending from an outer circumferential portion of the piston head; and a cylinder block (10) formed of an aluminum alloy, the cylinder block…",
  "path": "/patents/1398202",
  "publishedAt": "2025-07-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02F3/105",
    "YAMAHA MOTOR CO LTD [JP]"
  ],
  "textContent": "An internal combustion engine (100) includes a piston (40) formed of an aluminum alloy, the piston including a piston head (43) and a piston skirt (44) extending from an outer circumferential portion of the piston head; and a cylinder block (10) formed of an aluminum alloy, the cylinder block including a cylinder wall (12) including a sliding surface (12a), along which the piston is slidable. The aluminum alloy is exposed to the sliding surface of the cylinder wall. The piston skirt includes a skirt substrate (b1) formed of an aluminum alloy, the skirt substrate including a plurality of streak grooves (sg) formed in an outer circumferential surface thereof, the piston skirt further including a resin layer (rl) formed on at least a part of the outer circumferential surface of the skirt substrate. The outer circumferential surface of the skirt substrate has a ten-point average surface roughness RzJIS of 20 µm or larger.",
  "title": "INTERNAL COMBUSTION ENGINE AND TRANSPORTATION DEVICE"
}