A landing gear assembly includes a primary load bearing strut, for example a landing gear leg 12, comprising a shock absorber having a slider part 15 arranged to slide within a cylinder part 17, a link assembly, for example a torque link assembly 50 attached between the slider part 15 and the cylinder part 17, a bogie 16 on which multiple wheels 18f, 18, 18r are supported mounted on the strut 12 such that the bogie 16 may adopt different pitch angles and a pitch trimmer device 70, for example a linear hydraulic actuator, attached at a first end 72 to the bogie 16 and at a second end 74 to the link assembly 50, for example thus providing a relatively long moment arm (96 fig. 8) for control of the bogie pitch angle. The arrangement may be such that the pitch trimmer 70 is approximately centralised (i.e. at or near mid-stroke) as the aircraft achieves the full weight on wheels condition, whereas the pitch trimmer 70 is at its outstop (fullest extent) for the flight case and for retraction. Onset of pitch trimmer closure/movement may be used to detect the weight-on-wheels condition.
Pitch trimmer
2019-01-02
Patent
Elektronische Ressource
Englisch