Transmission mechanism for extension and retraction of ceiling propeller of low-altitude civil rotorcraft capable of vertical takeoff and landing

Abstract

The invention provides a transmission mechanism for extension and retraction of a ceiling propeller of a low-altitude civil rotorcraft capable of vertical takeoff and landing. The transmission mechanism simply achieves extension and retraction of the ceiling propeller, adjusts the length of the ceiling propeller, adapts to normal takeoff of the low-altitude civil rotorcraft well, and reduces air impacts on two wings and the body of the aircraft when the low-altitude civil rotorcraft flies normally or enters a warehouse. The transmission mechanism comprises a base blade holder and is characterized in that base blades are arranged on the base blade holder and are sleeved with end blades; adjusting screw tubes are installed in the base blades; adjusting bolts matched with the adjusting screw tubes are arranged on the end blades; the adjusting screw tubes are connected to driven bevel gears; the driven bevel gears are meshed with a first transmission bevel gear; the first transmission bevel gear is connected to a transmission mandrel; the other end of the mandrel is connected to a second transmission bevel gear; a spline shaft is arranged corresponding to one end of the second transmission bevel gear and is sleeved with a sliding bevel gear; and the sliding bevel gear is meshed with the second transmission bevel gear during movement and is connected to a motor shaft and a clutch mechanism.

Description

technical field [0001] The invention relates to the technical field of rotorcraft, in particular to a top propeller telescopic transmission mechanism of a vertical lift and lower altitude civil rotorcraft. Background technique [0002] The vertical lift and low-altitude civilian rotorcraft is a low-altitude civilian aircraft. The top wing provides power for the aircraft to rise through the rotation of the top propeller when it takes off. If it is too large, it will cause a large airflow impact on the wings and fuselage of the aircraft, which will affect the flight safety of the aircraft. For the design of a top propeller with a variable length, the above problems can be solved, but the top propeller needs to be changed during flight. The length is indeed another problem to be solved. Contents of the invention [0003] Aiming at the above-mentioned technical problems, the present invention provides a telescoping transmission mechanism of the top propeller of a vertical lif...

AI Technical Summary

Problems solved by technology

[0002] The vertical lift and low-altitude civilian rotorcraft is a low-altitude civilian aircraft. The top wing provides power for the aircraft to rise through the rotation of the top propeller when it takes off. If it is too large, it will cause a large airflow impact on the wings and fuselage of the aircraft, which will affect the flight safety of the aircraft. For the design of a top propeller with a variable length, the above problems can be solved, but the top propeller needs to be changed during flight. The length of the

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