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Improved attachment arrangement for a lifting surface

IP.com Disclosure Number: IPCOM000249983D
Publication Date: 2017-May-12
Document File: 3 page(s) / 300K

Publishing Venue

The IP.com Prior Art Database

Abstract

Aircraft structural attachments for lift surfaces such as high-lift movables ex. a flap or flight control surfaces such as ailerons, or any other similar device.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 73% of the total text.

Title: Improved attachment arrangement for a lifting surface.

Page 1 of 3

1. TECHNICAL AREA

Aircraft structural attachments for lift surfaces such as high-lift movables ex. a flap or flight control surfaces such as ailerons, or any other similar device. 2. PRIOR ART

Usually a support of an inner flap is usually located in a belly fairing of an aircraft. An outer trunnion is used to connect the flap with the support as shown. The outermost and innermost ribs are usually made from machined aluminium (Al) and/or steel (St). Usually the outer trunnion is manufactured from titanium (ti), but can manufactures from aluminium or steel or any other suitable material. The outer trunnion has a hollow profile to allow installation of an inner trunnion which provides a 2nd load path between the flap and the support in case of an outer trunnion failure.

Inner trunnion

Title: Improved attachment arrangement for a lifting surface.

Page 2 of 3

The outer trunnion transfers shear and torsion, the inner trunnion only shear load. The inner trunnion is connected to station with a spherical bearing and supported with two ribs in the flap by bearings and bushes in each rib. The outermost end of the inner trunnion is retained at the outermost rib using threaded attachment parts. The inner trunnion is normally manufactured from Titanium. The support of the inner trunnion on two ribs has the disadvantage that a quite long inner trunnion is needed and a direct load introduction into two form ribs. The...