Aircraft propulsion assembly having a jet engine, a pylon and means for attaching the jet engine to the pylon

{
  "publication_number": "US12600483B2",
  "country": "US",
  "kind": "B2",
  "title": "Aircraft propulsion assembly having a jet engine, a pylon and means for attaching the jet engine to the pylon",
  "abstract": "A propulsion assembly for an aircraft, the propulsion assembly having a jet engine having a fan casing and a central casing around a longitudinal axis and having a vertical median plane passing through the longitudinal axis, an attachment pylon having a rigid structure that takes the form of a box that has a front wall and an upper spar extending forwardly in respect to the front wall, a front engine attachment fixed between an upper area of the fan casing and a front end of the upper spar, and a complementary front engine attachment fixed between an upper area of the central casing and a lower end of the front wall.",
  "claims": [
    "1. A propulsion assembly for an aircraft, said propulsion assembly comprising: a jet engine having a fan casing and a central casing around a longitudinal axis and having a vertical median plane passing through the longitudinal axis, an attachment pylon having a rigid structure that takes a form of a box that has a front wall and an upper spar extending forwardly in respect to the front wall, a front engine attachment fixed between an upper area of the fan casing and a front end of the upper spar, and a complementary front engine attachment fixed between an upper area of the central casing and a lower end of the front wall, wherein the front engine attachment comprises a lever mounted in a first articulated manner on the front end of the upper spar at the vertical median plane and first and second ends of the lever are mounted to the upper area of the fan casing in a second articulated manner on opposite sides of the vertical median plane, the first articulated manner and the second articulated manner each providing at least a rotation around an axis parallel to the longitudinal axis.",
    "2. The propulsion assembly according to claim 1, further comprising: a main rod fixed between the upper spar and the front wall.",
    "3. The propulsion assembly according to claim 1, wherein the first articulated manner and the second articulated manner each employs a ball joint link.",
    "4. The propulsion assembly according to claim 1, wherein the second articulated manner of one of the first end or the second end of the lever comprises waiting fail safe elements.",
    "5. The propulsion assembly according to claim 1, wherein the complementary front engine attachment comprises on each side of the vertical median plane, a pair of first rods, wherein a first end of each first rod is mounted in a third articulated manner on the lower end of the front wall and wherein a second end of each first rod is mounted in a fourth articulated manner on the upper area of the central casing.",
    "6. The propulsion assembly according to claim 1, wherein the complementary front engine attachment comprises two fitting assemblies, each one comprising, at the vertical median plane, a first articulation point with the lower end of the front wall, and on opposite sides of the vertical median plane, a second articulation point with the upper area of the central casing.",
    "7. An aircraft comprising: a wing and the propulsion assembly according to claim 1, wherein the rigid structure is fastened beneath the wing."
  ],
  "description_excerpt": "The present invention relates to the general field of attaching a jet engine beneath the wing of an aircraft. It relates in particular to a propulsion assembly comprising a jet engine, in particular a turbofan, a pylon and also an attachment device intended to attach the jet engine beneath the pylon. It also relates to an aircraft equipped with such a propulsion assembly.\n\nA propulsion assembly of the prior art is fastened beneath a wing of an aircraft that has a jet engine and an attachment pylon via which the jet engine is fastened beneath the wing. Generally, the attachment pylon has a rigid structure, which is also called the primary structure, bearing first fastening elements intended to attach the jet engine.\n\nThese first fastening elements are formed of a front engine attachment, a rear engine attachment, and a device for reacting the thrust forces generated by the jet engine.\n\nThe attachment pylon also has second fastening elements allowing the attachment pylon to be fastened to the wing.\n\nThe jet engine has, at the front, a fan casing surrounding an annular fan duct and, towards the rear, a central casing of smaller size, enclosing the core of the jet engine.\n\nThe front engine attachment is interposed between a front end of the rigid structure and a front upper part of the central casing, and the rear engine attachment is interposed between the rigid structure and a rear upper part of the central casing.",
  "cpc": [
    "B64D 27/402",
    "B64D 27/18",
    "B64D 27/404",
    "F02C 7/20"
  ],
  "ipc": [
    "B64D 27/18",
    "B64D 27/40",
    "F02C 7/20"
  ],
  "assignees": [
    "Airbus Operations SAS"
  ],
  "inventors": [
    "Thomas Deforet",
    "Frédéric Journade",
    "Mathieu MAHE",
    "Antoine CLAVEYROLLAS",
    "Mathieu Kaleta",
    "Eric Renaud"
  ],
  "filing_date": "2024-06-12",
  "publication_date": "2026-04-14",
  "grant_date": "2026-04-14",
  "priority_date": "2023-06-14",
  "application_number": "US-202418740948-A",
  "family_id": "91330956",
  "cited_by_count": 0,
  "citations": [
    "US5746391A",
    "US20090189014A1",
    "US20130240666A1"
  ]
}