Importance

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Abstract

An overload protection device for the drive engine of a propeller, wherein the pitch of the propeller blades may be adjusted: A servomotor with a piston therein and the servomotor being controlled by a control valve which is adjustable by an adjustment lever. The piston of the servomotor is connected via a push rod to the control station of the propeller. An adjustment device is associated with the control valve for adjusting the control valve in a direction to reduce the pitch thereof when drive engine overload occurs. A signal from the drive engine passes through a converter which magnifies it. The magnitude of the signal, as converted, is proportional to the loading of the drive engine. A reversing valve, controlled by the position of the control piston of the servomotor, operates a double acting piston connected with the operating rod of the control valve. Depending upon the shifting of the operating piston of the control valve, the servomotor is operated to adjust the pitch of the propeller blades.

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First Claim