As a result, the takeoff field length (TOFL) of the aircraft may be reduced, the thrust used by the engines may be reduced, or the weight carried by the aircraft may be increased while maintaining the same takeoff field length. By rotating about the aft axle, the landing gear height is effectively increased so as to provide additional ground clearance for rotation of the aircraft during takeoff. As such, the aircraft pivots about the aft axle, rather than the pin that pivotally connects the bogie beam to the shock absorber, provided that the extend pressure of the shock absorber has been increased sufficiently. A semi-levered landing gear fixedly positions the shock absorber and the forward end of the bogie beam during takeoff such that the forward axle is in a raised position relative to the aft axle when the airplane has left the ground. In order to provide additional ground clearance for rotation of the aircraft during takeoff, semi-levered landing gear mechanisms have been developed. F15B15/16- Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type.F15B15/14- Characterised by the construction of the motor unit of the straight-cylinder type.F15B15/08- Characterised by the construction of the motor unit.F15B15/00- Fluid-actuated devices for displacing a member from one position to another Gearing associated therewith.SERVOMOTORS DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR F15B- SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL FLUID-PRESSURE ACTUATORS, e.g.F15- FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL.F- MECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING.B64C25/36- Arrangements or adaptations of wheels, tyres, or axles in general.B64C25/34- Alighting gear characterised by the ground or like engaging elements wheeled type, e.g.jettisonable retractable, foldable, or the like B64C25/10- Undercarriages non-fixed, e.g.B64C25/08- Undercarriages non-fixed, e.g.
B64C25/58- Arrangements or adaptations of shock-absorbers or springs.B64C25/32- Alighting gear characterised by the ground or like engaging elements.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to US12/951,861 priority Critical patent/US9481452B2/en Priority to US13/474,332 priority patent/US20130119196A1/en Application filed by Boeing Co filed Critical Boeing Co Priority to US14/697,621 priority patent/US9764827B2/en Publication of US20160207616A1 publication Critical patent/US20160207616A1/en Application granted granted Critical Publication of US9764827B2 publication Critical patent/US9764827B2/en Status Active legal-status Critical Current Adjusted expiration legal-status Critical Links Original Assignee Boeing Co Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Lindahl Eric Howard Nelson Mitchell Loren Ray Mellor Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number US14/697,621 Other versions US9764827B2 Google Patents US20160207616A1 - Hydraulic strut assembly for semi-levered landing gear US20160207616A1 - Hydraulic strut assembly for semi-levered landing gear
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