Trigger structure for negative-tension automatic feathering system

Abstract

The invention discloses a trigger structure for a negative-tension automatic feathering system. The trigger structure comprises a speed reducer casing, a first control oil circuit and a negative-tension sensor. A propeller shaft which is connected with a screw propeller is rotationally arranged in a shaft hole in the speed reducer casing, and a tension bearing is mounted on an outer circle of thepropeller shaft. The first control oil circuit is connected with the negative-tension automatic feathering system, so that the negative-tension automatic feathering system can be triggered to work after the internal oil pressures of oil circuits of the first control oil circuit are lower than limit values, and the screw propeller can be automatically feathered. The negative-tension sensor is connected onto an end surface of an inner cavity of the speed reducer casing, is butted to an end of the outer side of the tension bearing and is used for sensing negative tension on the tension bearing inreal time, the negative tension is transmitted onto the tension bearing by the propeller shaft, and the negative-tension sensor is communicated with the first control oil circuit after the fact thatthe negative tension is higher than limit values is sensed, so that the oil pressures of the first control oil circuit can be reduced. Compared with the prior art, the trigger structure for the negative-tension automatic feathering system has the advantages that control procedures are simple, and the trigger structure is high in trigger precision; the magnitude of the negative tension can be sensed in real time, and the reliability of the negative-tension automatic feathering system can be improved when the negative-tension automatic feathering system works.

Description

technical field [0001] The invention relates to the field of turboprop engines, in particular to a trigger structure for a negative tension automatic feathering system. Background technique [0002] Aviation turboprop engine (referred to as turboprop engine) generally works together with air propeller to form the power plant of the aircraft. For flight safety and to keep the resistance of the propeller to the minimum along the flight direction, functions such as torque automatic feathering, negative tension automatic feathering, manual feathering, emergency hydraulic feathering and manual return are set. [0003] During the normal flight of the aircraft, the propeller generates forward positive pulling force as the power of the aircraft. When the propeller generates negative pulling force and exceeds a certain limit value during flight, the mechanism needs to be triggered to trigger the negative pulling force automatic feathering system to work, so that the propeller is auto...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a trigger structure of a negative tension automatic feathering system to solve the technical problems of the existing negative tension automatic feathering system with complex trigger structure, low trigger precision, and inability to sense the magnitude of the negative tension in real time

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