Electric motor driven variable pitch propeller

Abstract

The application discloses a motor-driven variable-pitch propeller, wherein a forward-reverse motor is fixed at the front end of a propeller shell; screw rods are rotatably installed in the inner wall grooves of the front and rear end faces of the propeller shell; the driving shaft of the forward-reverse motor is connected with the screw rods through a key groove; a thread nut with a circle of rectangular grooves on the peripheral wall is connected with the screw rods, and eccentric pins of each propeller blade are arranged in the rectangular grooves; the forward-reverse motor stops running at the moment when the thread nut leaves the contact of a feathering stroke control lever; when the thread nut moves towards the motor direction against the contact of the feathering stroke control lever, the thread nut can stop at a position between the positions of the thread nut on the screw rods when the propeller blades are in the feathering and reverse directions according to the propeller blade angle selected by a propeller blade angle control panel; the forward-reverse motor stops running at the moment when the thread nut contacts the reverse stroke control lever. The application realizes the functions of variable-pitch, feathering and reverse, and has no oil leakage problem; the variable-pitch speed and precision are greatly improved; the mass of the propeller is reduced; and the quality and safety of the propeller are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a motor-driven variable-pitch propeller. BACKGROUND

[0002] At present, the propeller in China is mostly hydraulic variable-pitch propeller, which realizes variable-pitch by switching oil circuit to control the in and out of high-pressure oil in the oil chamber. The hydraulic variable-pitch propeller has complex structure and high requirement for the sealing of the propeller, and in the process of use, it is easy to have oil leakage and oil mixing phenomenon, which not only affects the variable-pitch performance, but also pollutes other components. SUMMARY

[0003] The present application aims to solve the above problems in the prior art, and provides a motor-driven variable-pitch propeller, which realizes variable-pitch, feathering and reverse-pitch functions, has no oil leakage problem, has simple structure, greatly improves variable-pitch speed and variable-pitch precision, effectively reduces the mass of the propeller, and improves the quality and safety of the propeller.

[0004] To achieve the above-mentioned purpose, the technical solution of the present application is as follows: a motor-driven variable-pitch propeller, comprising a forward-reverse motor, a propeller shell, two or more than two propeller blades uniformly distributed on the propeller shell, a lead screw, a nut, a feathering control lever and a reverse-pitch control lever; the stepped root of the propeller blade is rotatably and variably angularly installed in the stepped through hole inside the propeller sleeve of the propeller shell, and the end face of the propeller blade root is fixed with an eccentric pin; the forward-reverse motor is fixed in the shallow circular groove at the front end of the propeller shell; the lead screw is rotatably installed in the groove in the inner wall of the front and rear end faces of the propeller shell; the driving shaft of the forward-reverse motor passes through the through hole in the front end face of the propeller shell, and is coaxially connected with the lead screw through the key groove; the nut is threadedly connected to the lead screw, and a circle of rectangular grooves is opened in the peripheral wall of the nut; the eccentric pin of each propeller blade is arranged in the rectangular groove; the feathering stroke control lever comprises a fixed sleeve lever fixed on the front end wall of the propeller shell and a contact head telescopically and non-detachably connected in the inner hole of the fixed sleeve lever; the reverse-pitch stroke control lever is fixed on the front end wall of the propeller shell, and the front end thereof directly extends out the contact head or non-detachably connects the contact head; the nut stops running at the moment when it leaves the contact head of the feathering stroke control lever, the feathering is stopped, and the propeller is feathered; when the nut moves towards the motor direction against the contact head of the feathering stroke control lever, it can stop at a position between the position of the nut when the feathering is stopped and the position of the nut when the reverse-pitch is stopped according to the angle of the propeller blade angle selected by the propeller blade angle control panel; the nut stops running at the moment when it abuts against the contact head of the reverse-pitch stroke control lever, the reverse-pitch is stopped, and the propeller is reverse-pitched; the feathering control button, the reverse-pitch control button and the propeller blade angle control button during normal take-off and normal flight of the aircraft are installed on the panel in the cockpit of the aircraft.

[0005] Further preferably, the structure that the two ends of the screw rod are rotatably installed in the grooves in the inner walls of the front and rear ends of the paddle shell is that a bearing steel ball bracket is placed in a mounting groove in the inner wall of the rear end face of the paddle shell, a bearing steel ball accommodating groove is opened in the front end face of the bearing steel ball bracket, a bearing steel ball mounting circular groove is opened in the rear end face of the screw rod, the bearing steel ball is wrapped and pressed in the bearing steel ball bracket mounting groove and the screw rod mounting circular groove, an adjusting screw is threadedly connected in a threaded hole in the inner wall of the rear end face of the paddle shell, and the front end of the adjusting screw is pressed against the rear end face of the bearing steel ball bracket; the front end of the screw rod is rotatably sleeved in a groove in the inner wall of the front end face of the paddle shell. The resistance and friction in the rotating process of the mounting structure are small, and the damage is small.

[0006] Further preferably, the paddle shell is two-piece type and is divided into front and rear paddle shells which are fixed together by screws. The installation of the paddle blade is facilitated.

[0007] Further preferably, the connecting thread between the nut and the screw rod is trapezoidal thread.

[0008] Due to the above scheme, the forward and reverse motor is started, the motor shaft drives the screw rod to rotate, the nut can produce axial movement, the paddle eccentric pin is placed in the rectangular groove of the nut, the axial movement of the nut makes the paddle eccentric pin slide along the rectangular groove of the nut and rotate around the paddle axis, and the variable pitch is realized. The forward and reverse motor stops running at the moment when the nut leaves the contact of the feathering stroke control rod, the feathering is stopped, and the propeller is feathered; the forward and reverse motor stops running at the moment when the nut abuts against the contact of the reverse stroke control rod, the reverse is stopped, and the propeller is reversed.

[0009] In summary, the motor is used to provide variable pitch driving force, the functions of variable pitch, feathering and reversing are realized, the structure is simple, and the mass of the propeller is effectively reduced; there is no oil leakage problem, the variable pitch speed and variable pitch accuracy are greatly improved, the phenomenon of slow variable pitch and variable pitch caused by oil leakage of the propeller is eliminated, and the quality and safety of the propeller are improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 The figure is a structural schematic diagram of the application. DETAILED DESCRIPTION

[0011] The application will be further described below in combination with the drawings and specific embodiments.

[0012] As Figure 1The embodiment includes a reversible motor 1, a propeller shell 9, two or more than two propeller blades 3 (three in this embodiment) evenly distributed on the propeller shell 9, a lead screw 8, a lead nut 4, a forward flight control lever 10 and a reverse flight control lever 2. The ladder-shaped root of the propeller blade 3 is rotatably and variably angularly installed in the ladder-shaped through hole inside the propeller sleeve of the propeller shell 9. Preferably, the propeller shell 9 is two-piece, divided into front and rear propeller shells fixed together by screws, facilitating the installation of the propeller blade 3. The root end face of the propeller blade 3 is fixed with an eccentric pin 12. The reversible motor 1 is fixed in the shallow circular groove at the front end of the propeller shell 9 by screws 11. The lead screw 8 is rotatably installed in the groove on the inner wall of the front and rear end faces of the propeller shell 9. Preferably, the bearing steel ball bracket 7 is placed in the installation groove on the inner wall of the rear end face of the propeller shell 9, and the front end face of the bracket is provided with a bearing steel ball 5 accommodating groove. The rear end face of the lead screw 8 is provided with a bearing steel ball 5 installation circular groove, and the bearing steel ball 5 is wrapped and pressed in the installation groove of the bearing steel ball bracket 7 and the installation circular groove of the lead screw 8. The adjusting screw 6 is threadedly connected in the threaded hole on the inner wall of the rear end face of the propeller shell 9, and the front end of the adjusting screw 6 is pressed against the rear end face of the bearing steel ball bracket 7 to adjust the pressing force of the bearing steel ball 5. The front end of the lead screw 8 is rotatably sleeved in the groove on the inner wall of the front end face of the propeller shell 9. The driving shaft of the reversible motor 1 passes through the through hole on the front end face of the propeller shell 9 and is coaxially connected with the lead screw 8 through a key groove. The lead nut 4 is threadedly connected with the lead screw 8, and preferably, the connection thread between the lead nut 4 and the lead screw 8 is a trapezoidal thread. A circle of rectangular grooves 13 is opened on the wall of the lead nut 4, and the eccentric pin 12 of each propeller blade 3 is placed in the rectangular groove 13. The forward flight control lever 10 includes a fixed sleeve lever 14 fixed on the front end wall of the propeller shell 9 and a contact 15 telescopically and non-detachably connected in the inner hole of the fixed sleeve lever 14. The reverse flight control lever 2 is fixed on the front end wall of the propeller shell 9, and the front end of the reverse flight control lever 2 directly extends out a contact or is non-detachably connected with a contact. The reversible motor 1 stops running at the moment when the lead nut 4 leaves the contact 15 of the forward flight control lever, the forward flight is stopped, and the propeller rotates forward. When the lead nut 4 moves towards the motor 1 against the contact 15 of the forward flight control lever, the lead nut 4 stops at a position between the positions of the lead nut 4 on the lead screw at the moment of forward flight and the moment of reverse flight according to the angle of the propeller blade angle selected by the propeller blade angle control panel. The reversible motor 1 stops running at the moment when the lead nut 4 contacts the contact of the reverse flight control lever 2, the reverse flight is stopped, and the propeller rotates reversely. The forward flight control button, the reverse flight control button and the propeller blade angle control button during normal take-off and normal flight of the aircraft are installed on the panel of the cockpit of the aircraft.

[0013] Of course, the present application has other various embodiments, and those skilled in the art can make corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application. However, these corresponding changes and modifications should belong to the equivalent technical improvements and belong to the protection scope of the claims of the present application.

Claims

1. A motor-driven variable-pitch propeller, characterized in that: It includes a forward and reverse motor, a propeller shell, two or more propeller blades evenly distributed on the propeller shell, a screw, a nut, a feathering and a reverse propeller control lever; the stepped root of the propeller blade can be rotatably installed at a variable angle in the stepped through hole inside the propeller sleeve of the propeller shell, and an eccentric pin is fixed to the end face of the root of the propeller blade; the forward and reverse motor is fixed in the shallow circular groove at the front end of the propeller shell; the two ends of the screw can be rotatably installed in the grooves on the inner wall of the front and rear end faces of the propeller shell; the driving shaft of the forward and reverse motor passes through the through hole opened on the front end face of the propeller shell and is coaxially connected to the screw through a keyway; the nut is threadedly connected to the screw, and a circle of rectangular grooves is opened on its peripheral wall, and the eccentric pins of each propeller blade are placed in the rectangular grooves; the feathering stroke control lever includes a fixed sleeve rod fixed on the front end wall of the propeller shell and a retractable and anti-slip connected to the A contact is fixed in the inner hole of the sleeve rod; the reverse propeller stroke control rod is fixed to the front end wall of the propeller housing, and a contact is directly extended from its front end or connected to the contact in a manner that prevents it from falling out; the moment the nut leaves the feathering stroke control rod contact, the forward and reverse motors stop running, the feathering is stopped, and the propeller feathers; when the nut moves toward the motor against the feathering stroke control rod contact, it can stop at a position between the position where the nut stops on the lead screw during feathering and reverse propeller according to the blade angle selected by the blade angle control panel; the moment the nut contacts the reverse propeller stroke control rod contact, the forward and reverse motors stop running, the reverse is stopped, and the propeller reverses; the feathering control button, the reverse propeller control button, and the blade angle control button during normal aircraft takeoff and normal flight are installed on the panel of the aircraft cockpit; The structure in which the two ends of the lead screw are rotatably mounted in the grooves of the front and rear end inner walls of the paddle housing is as follows: the bearing steel ball bracket is placed in the mounting groove opened on the inner wall of the rear end surface of the paddle housing, the front end surface of the bearing steel ball bracket is provided with a accommodating groove for the bearing steel ball, the rear end surface of the lead screw is provided with a bearing steel ball mounting circular groove, the bearing steel ball is wrapped and squeezed in the mounting groove of the bearing steel ball bracket and the mounting circular groove of the lead screw; the adjusting screw is threadedly connected to the threaded hole opened on the inner wall of the rear end surface of the paddle housing, and the front end of the adjusting screw is pressed against the rear end surface of the bearing steel ball bracket; the front end of the lead screw is rotatably sleeved in the groove opened on the inner wall of the front end surface of the paddle housing.

2. The motor-driven variable-pitch propeller according to claim 1, characterized in that: The paddle shell is a two-part type, divided into a front and a rear paddle shell fixed together by screws.

3. The motor-driven variable-pitch propeller according to claim 1 or 2, characterized in that: The connecting thread between the nut and the lead screw is a trapezoidal thread.

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