{
  "$type": "site.standard.document",
  "description": "The present invention provides an engine in which the positions of each valve and a spark plug are optimized with respect to an extension space. The engine 10 comprises: a cylinder chamber 12, an intake valve 18, an exhaust valve 19, and a spark plug 26. Inside the cylinder chamber 12, opposing…",
  "path": "/patents/1390394",
  "publishedAt": "2026-06-10T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01B7/02",
    "KUBOTA KK [JP]"
  ],
  "textContent": "The present invention provides an engine in which the positions of each valve and a spark plug are optimized with respect to an extension space. The engine 10 comprises: a cylinder chamber 12, an intake valve 18, an exhaust valve 19, and a spark plug 26. Inside the cylinder chamber 12, opposing pistons are arranged so as to reciprocate. An extension space 33 is a space continuous from an intermediate portion of the cylinder chamber 12 toward a side. On a first side surface 3313 of the extension space 33, a first intake valve 181 is arranged. On a second side surface 3314 of the extension space 33, which opposes the first side surface 3313, a first exhaust valve 191 and a first spark plug 261 are arranged.",
  "title": "ENGINE"
}