External Mid-Mount Drive For Powered Landing Gear With Cross-Port Disable Valve Travel Limiter

摘要

An external mount travel limiter for landing gear extension legs which employs a pair of mechanically-operable cross-port valves fluidly coupled to the hydraulic circuit that are operably synchronized for actuation based on movement of the telescoping upper and lower leg assemblies of the landing gear between respective extend and retract travel stop limit positions. The valves are connected to the leg assemblies via an external drive shaft which synchronously drives a valve actuator that actuates one of the valves upon the lower leg assembly reaching a travel stop limit position in either direction. When actuated, each valve cross-ports the system's fluid flow from the valve's inlet port to the system's return line, thereby permitting all fluid flow and power to bypass the power drive motor.

主权项

1. A travel limiting apparatus for fluid-powered landing gear, comprising:
(a) a first leg assembly; (b) a second leg assembly received within said first leg assembly and telescopically movable therein between a fully retracted position and a fully extended position; (c) a fluid powered motor operably connected to said first and said second leg assembly for causing movement of said second leg assembly relative to said first leg assembly; (d) a mechanically actuated motor disabling member connected to said motor for diverting fluid flow away from said motor when actuated; (e) an actuating member operably synchronized with movement of said second leg assembly so as to apply a mechanical actuating force to said motor disabling member upon said second leg assembly reaching a predetermined travel stop limit position adjacent to but short of one or both of said fully retracted and said fully extended positions.