초록 ▼

A counterrotatable bladed rotor assembly drivable by a rotatable shaft comprises a leading propeller, a trailing propeller, and a gearbox located axially between the two propellers and enclosed by a non-rotatable casing having an end for attachment to a support structure. The gearbox has a first out

A counterrotatable bladed rotor assembly drivable by a rotatable shaft comprises a leading propeller, a trailing propeller, and a gearbox located axially between the two propellers and enclosed by a non-rotatable casing having an end for attachment to a support structure. The gearbox has a first output shaft to the leading propeller and a second output shaft to the trailing propeller. A first fluid-pressure operable actuator is provided to vary the pitch of the blades of the leading propeller, and a second fluid-pressure operable actuator is provided to vary the pitch of the blades of the trailing propeller. In addition passageways are provided to connect the first and second actuators to a source of fluid under pressure. The casing rotatably supports the second output shaft at a position between the gearbox and the leading propeller and rotatably supports the first output shaft at a position between the gearbox and the trailing propeller. In this manner a compact and lightweight support arrangement is provided for the propellers.

대표청구항 ▼

A speed control system for a counter-rotatable bladed rotor assembly which comprises: (a) a rotatable shaft to drive first and second counter-rotatable bladed rotors; (b) a gearbox axially located between the first and second counter-rotatable bladed rotors; (c) first and second electro-hydraulic va

A speed control system for a counter-rotatable bladed rotor assembly which comprises: (a) a rotatable shaft to drive first and second counter-rotatable bladed rotors; (b) a gearbox axially located between the first and second counter-rotatable bladed rotors; (c) first and second electro-hydraulic valves; (d) first and second fluid pressure operable actuators to vary the pitch of the blades of the bladed rotor assembly responsive to fluid under pressure controlled respectively by the first and second electro-control valves. (e) valve means to connect the first and second fluid pressure operable actuators to the first and second electro-hydraulic valves; (f) a first source of fluid under pressure connected to the first fluid pressure operable actuator and the first electro-hydraulic valve; and (g) a second source of fluid under pressure connected to the second fluid pressure operable actuator and the second electro-hydraulic valve; wherein the speed control system comprises: an electronic control unit, responsive to a signal indicating desired rotational speed of the rotors set by the pilot and to first and second rotor speed feedback means for relaying rotational speed of the first and second rotor respectively to provide a separate control signal to control the respective electro-hydraulic valves to separately control rotational speed of the first and second rotors to said desired speed.