A stop pad (11) for an aircraft landing gear arranged to provide protection against impact between first and second elements of the landing gear, the stop pad being arranged to provide an indication that it is been subject to an impact against one of the first or second landing gear elements, the im
A stop pad (11) for an aircraft landing gear arranged to provide protection against impact between first and second elements of the landing gear, the stop pad being arranged to provide an indication that it is been subject to an impact against one of the first or second landing gear elements, the impact having an impact load above a predetermined threshold level.
대표청구항▼
1. A stop pad for an aircraft landing gear arranged to provide protection against impact between first and second elements of the landing gear, the stop pad being arranged to provide an indication that it has been subjected to an impact against one of the first or second landing gear elements, the i
1. A stop pad for an aircraft landing gear arranged to provide protection against impact between first and second elements of the landing gear, the stop pad being arranged to provide an indication that it has been subjected to an impact against one of the first or second landing gear elements, the impact having an impact load above a predetermined threshold level. 2. A stop pad according to claim 1, wherein said indication is a visual indication. 3. A stop pad according to claim 2, wherein said visual indication may comprise the deformation of one or more external surfaces of the stop pad. 4. A stop pad according to claim 3, wherein an external surface of the stop pad may have one or more recesses formed therein and the visual indication comprises the deformation of at least one of these recesses. 5. A stop pad according to claim 3, wherein the stop pad may comprise a porous material and the plastic yield point of the porous material is determined as a function of the materials porosity. 6. A stop pad according to claim 2, wherein the visual indication may comprise at least partial egress of a substance from the stop pad. 7. A stop pad according to claim 6, comprising at least one layer of said substance extending to an edge of the stop pad, wherein the substance has a plastic yield point equal to the predetermined threshold level such that when the stop pad is subject to an impact load above the predetermined threshold level, at least a portion of the layer of said substance is extruded beyond the edge of the stop pad. 8. A stop pad according to claim 7 comprising multiple layers of said substance. 9. A stop pad according to claim 8, wherein two or more of the multiple layers have different plastic yield points. 10. A stop pad according to claim 6, wherein the stop pad comprises at least one internal cavity in which said substance is arranged to be located and at least one external orifice connected to the internal cavity, the internal cavity being arranged to be compressed when the stop pad is subject to an impact load such that at least some of the substance is urged out of the orifice when the impact load exceeds the predetermined threshold level. 11. A stop pad according to claim 10, wherein said substance has a plastic yield point equal to the predetermined threshold level. 12. A stop pad according to claim 10, wherein said substance comprises a fluid and said orifice is fluidly sealed by sealing means, the sealing means being arranged to allow egress of the fluid through the orifice when the stop pad is subject to an impact load above the predetermined threshold level. 13. A stop pad according to claim 12, wherein the fluid comprises an incompressible fluid. 14. A stop pad according to claim 12, wherein the stop pad comprises a plurality of fluidly connected internal cavities. 15. A stop pad according to claim 2, comprising: a main body arranged to arranged to elastically deform when subjected to an impact load; a first band formed around a periphery of the main body and arranged to expand as the main body deforms; and a second band formed around the first band and arranged to rupture when the first band expands by a predetermined extent corresponding to the extent of expansion caused by the deformation of the main body when the stop pad is subjected to an impact load exceeding the predetermined threshold level. 16. A stop pad according to claim 15, further comprising at least one plate formed across the main body to inhibit deformation of the main body in a direction substantially normal to the plate. 17. A stop pad according to claim 15, wherein the main body, first and second bands are substantially circular. 18. A stop pad according to claim 15 wherein the first band includes braided fibers. 19. A stop pad according to 15, wherein the second band includes linear wound fibers. 20. A stop pad according to claim 15, wherein the main body comprises a rubber or polymer material. 21. A stop pad according to claim 1 including at least one recess formed in the stop pad, the recess being arranged to plastically deform when the stop pad is subjected to an impact load above the predetermined threshold, the deformation of the recess providing said indication. 22. A stop pad according to claim 21, wherein the recess comprises a hole formed through the stop pad. 23. A stop pad according to claim 21, wherein the occurrence of deformation of the recess is controlled by one or more of the size, shape, orientation and location of the recess. 24. A stop pad according to claim 1, wherein the stop pad has at least one blind recess formed therein, the blind recess being arranged to promote a fracture forming in the stop pad when the stop pad is subject to an impact load above the predetermined threshold, the fracture allowing the escape of a pressurized fluid introduced into the recess to provide said indication 25. A stop pad according to claim 24, wherein the blind recess comprises one or more connected holes formed through the stop pad, with each end of the holes except one being sealed. 26. A stop pad according to claim 24, wherein the formation of a fracture is controlled by one or more of the set consisting of size, shape, orientation and location of the recess. 27. An aircraft landing gear comprising: a bogie beam, at least one additional landing gear element, and a stop pad located on the bogie beam, the stop pad arranged to provide protection against impact between the bogie beam and the at least one additional landing gear element and to provide an indication that the stop pad has been subjected to an impact against the at least one additional landing gear element, the impact having an impact load above a predetermined threshold level.
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이 특허에 인용된 특허 (7)
White David (Bristol GB2), Auxiliary control of aircraft landing gear movement.
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