초록 ▼

A propeller system has a pair of hub assemblies driven in counter-rotation, each hub assembly having a mechanical pitch change actuator, each actuator being provided with a pitch lock that rotates simultaneously with the motion of the actuator to allow the actuator to set propeller blade pitch, but

A propeller system has a pair of hub assemblies driven in counter-rotation, each hub assembly having a mechanical pitch change actuator, each actuator being provided with a pitch lock that rotates simultaneously with the motion of the actuator to allow the actuator to set propeller blade pitch, but locks the propeller blade positionally when not rotating simultaneously with the actuator, and a differential for transmitting a pitch change signal across a rotating gap between the two hub assemblies and for providing power to a means for providing the pitch change signals. A pair of motors provide the rotative signal to set the pitch of the blades in each hub assembly. One of the pair of motors drives the actuator towards high pitch and the other motor drives the actuator towards low pitch. A synchronizer coordinates the signals of the first and second motors so that a pitch lock moves simultaneously with the actuator.

대표청구항 ▼

A pitch change system for a counter-rotating propeller having a first hub assembly and a second hub assembly, each of said hub assemblies mounting a plurality of variable pitch propeller blades thereto, said first hub assembly and said second hub assemblies being separated by a rotation gap, said sy

A pitch change system for a counter-rotating propeller having a first hub assembly and a second hub assembly, each of said hub assemblies mounting a plurality of variable pitch propeller blades thereto, said first hub assembly and said second hub assemblies being separated by a rotation gap, said system comprising: first pitch change means for changing the pitch of said blades mounted to said first hub assembly, second pitch change means for changing the pitch of said blades mounted to said second hub assembly, signal means for providing a signal to at least one of said first pitch change means and said second pitch change means, as required, to change said pitch of said blades of at least one of said first hub assembly and said second hub assembly, as required, said signal means being located with said second hub assembly, and differential means for providing power to said signal means as a function of the relative rotation between said first and second hub assemblies and for transmitting said signal to said first pitch change means across said rotation gap as required.