{
  "$type": "site.standard.document",
  "description": "A turbofan engine according to an exemplary embodiment of this disclosure includes, among other possible things, a first spool (30) including a first turbine (46); a second spool (32) including a second turbine (54) disposed axially forward of the first turbine (46); a first tower shaft (76)…",
  "path": "/patents/1398438",
  "publishedAt": "2025-08-13T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F01D25/18",
    "RTX CORP [US]"
  ],
  "textContent": "A turbofan engine according to an exemplary embodiment of this disclosure includes, among other possible things, a first spool (30) including a first turbine (46); a second spool (32) including a second turbine (54) disposed axially forward of the first turbine (46); a first tower shaft (76) engaged to the first spool (30); a second tower shaft (78) engaged to the second spool (32); a superposition gearbox (66) including a sun gear (102), a plurality of intermediate gears (104) engaged to the sun gear (102) and supported in a carrier (106) and a ring gear (108) circumscribing the intermediate gears (104), wherein the second tower shaft (78) is engaged to drive the sun gear (102); a first clutch (114) for selectively coupling the first tower (76) shaft to the ring gear (108); a second clutch (116) for selectively coupling the sun gear (102) to the carrier (106); and an accessory gearbox (68) driven by an output (118) of the superposition gearbox (66).",
  "title": "DUAL SPOOL POWER EXTRACTION WITH SUPERPOSITION GEARBOX"
}