Variable pitch air propeller and method of measuring the angular position of the propeller blades

摘要

The invention relates to aviation technology, specifically variable pitch air propellers. A particular feature of the propeller lies in the fact that it has concentric springs and torque transmissions which co-operate with the oil feed pipe from the side opposite the piston, that co-operation being maintained kinematically in the interval of the working angles of the blades. The inner of the springs is kinematically joined to the oil feed pipe in the axial direction and the outer spring so as to be capable of angular displacement in the peripheral direction relative to the inner spring, that angular displacement being effected by the propeller pair including pin and propeller groove. The springs are interconnected in the peripheral direction by a helical spring and are provided with inductors which co-operate with frequency sensors for determining the angular position of the blades. A particular feature of the proposed method of measuring the angular position of the blades lies in the fact that a pulse signal from the sensor is obtained by conversion of the sliding motion of the oil feed beta-pipe into rotary motion of the inductor. The range of measurements of the sliding movements of the oil feed pipe is restricted by a selected interval of the operating pitch angles of the blades.