阅读说明：本技术 一种电机驱动变距的螺旋桨 (Motor-driven variable-pitch propeller ) 是由 徐丁丁 李媛媛 蔡猛 于 2020-11-20 设计创作，主要内容包括：本发明公开了一种电机驱动变距的螺旋桨,正反电机固定在桨壳前端；丝杠两端可旋转地安装在桨壳前、后端面内壁凹槽内；正反电机驱动轴与丝杠通过键槽连接在一起；周壁上开有一圈矩形凹槽的丝母螺纹连接在丝杠上,各桨叶偏心销置于矩形凹槽内；丝母在离开顺桨行程控制杆触头的瞬间正反电机停止运行；丝母顶着顺桨行程控制杆触头向电机方向移动时,可根据桨叶角控制面板选择的桨叶角角度,停止在顺、反桨时丝母停止在丝杠上的位置之间的位置上；丝母在顶接反桨行程控制杆触头的瞬间正反电机停止运行。本发明实现了变桨距、顺桨和反桨功能,不存在渗漏油问题,变距速度和精度大幅提高,减轻了螺旋桨质量,提高了螺旋桨的品质及安全性。(The invention discloses a motor-driven variable-pitch propeller, wherein a positive and negative motor is fixed at the front end of a propeller shell; two ends of the screw rod are rotatably arranged in the grooves on the inner walls of the front end surface and the rear end surface of the paddle shell; the driving shaft of the positive and negative motors is connected with the screw rod through a key groove; a nut with a circle of rectangular grooves on the peripheral wall is connected to the screw rod in a threaded manner, and each blade eccentric pin is arranged in the rectangular groove; the forward and reverse motor stops running at the moment that the screw nut leaves the feathering stroke control rod contact; when the screw nut pushes the feathering stroke control rod contact to move towards the motor direction, the screw nut can stop at a position between the positions of the screw nut on the screw rod when feathering and backswing according to the blade angle selected by the blade angle control panel; the screw nut stops running at the instant when the screw nut abuts against the contact of the reverse propeller stroke control rod. The invention realizes the functions of variable pitch, feathering and reverse pitch, has no oil leakage problem, greatly improves the pitch-variable speed and precision, lightens the quality of the propeller and improves the quality and the safety of the propeller.)

1. A motor-driven variable pitch propeller is characterized in that: the paddle comprises a positive and negative motor, a paddle shell, two or more than two paddles uniformly distributed on the paddle shell, a screw rod, a nut, a feathering control rod and a reverse paddle control rod; the stepped root part of the paddle is rotatably and angularly variably arranged in the stepped through hole in the paddle sleeve of the paddle shell, and the end surface of the paddle root is fixedly provided with an eccentric pin; the positive and negative motors are fixed in the shallow circular groove at the front end of the paddle shell; two ends of the screw rod are rotatably arranged in the grooves on the inner walls of the front end surface and the rear end surface of the paddle shell; a driving shaft of the positive and negative motor penetrates through a through hole formed in the front end face of the paddle shell and is coaxially connected with the screw rod through a key groove; the screw nut is in threaded connection with the screw rod, a circle of rectangular groove is formed in the peripheral wall of the screw nut, and the eccentric pin of each paddle is arranged in the rectangular groove; the feathering stroke control rod comprises a fixed loop bar fixed on the front end wall of the paddle shell and a contact head which is connected in an inner hole of the fixed loop bar in a telescopic and anti-falling way; the reverse paddle stroke control rod is fixed on the front end wall of the paddle shell, and the front end of the reverse paddle stroke control rod directly extends out of the contact or is connected with the contact in a falling-off prevention manner; the forward and reverse motors stop running at the moment that the screw nut leaves the contact of the feathering stroke control rod, feathering stops, and the propeller feathers; when the screw nut pushes the feathering stroke control rod contact to move towards the motor direction, the screw nut can stop at a position between the positions of the screw nut on the screw rod during feathering and during reverse feathering according to the angle of the blade angle selected by the blade angle control panel; the screw nut stops running when the positive and negative motors are connected with the contact of the reverse propeller stroke control rod at the top, the reverse propeller stops running, and the propeller reverses propeller; the feathering control button, the reverse feathering control button and the blade angle control button are arranged on a panel of the aircraft cab during the taking off and normal flying of the normal aircraft.

2. The motor-driven variable pitch propeller of claim 1, wherein: the structure that the lead screw both ends are rotatably installed before the oar shell, in the rear end inner wall recess is: the bearing steel ball bracket is arranged in the mounting groove formed in the inner wall of the rear end face of the paddle shell, the front end face of the bearing steel ball bracket is provided with a bearing steel ball accommodating groove, the rear end face of the lead screw is provided with a bearing steel ball mounting circular groove, and the bearing steel balls are wrapped and extruded in the bearing steel ball bracket mounting groove and the lead screw mounting circular groove; the adjusting screw is in threaded connection with a threaded hole formed in the inner wall of the rear end face of the propeller 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 formed in the inner wall of the front end face of the paddle shell.

3. The motor-driven variable pitch propeller of claim 1 or 2, wherein: the paddle shell is of a two-body type and is divided into a front paddle shell and a rear paddle shell which are fixed together through screws.

4. The motor-driven variable pitch propeller of claim 3, wherein: the connecting thread of the nut and the lead screw is a trapezoidal thread.

Technical Field

The invention relates to a motor-driven variable-pitch propeller.

Background

At present, most domestic propellers are hydraulic variable pitch propellers, and the hydraulic variable pitch propellers realize variable pitch by controlling high-pressure oil to enter and exit an oil cavity through switching an oil way. The hydraulic variable pitch propeller has a complex structure, has high requirements on the sealing performance of the propeller, is easy to leak oil and cross oil in the using process, not only can influence the variable pitch performance, but also can pollute other components.

Disclosure of Invention

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

In order to achieve the purpose, the technical solution of the invention is as follows: a motor-driven variable-pitch propeller comprises a positive and negative motor, a propeller shell, two or more than two blades uniformly distributed on the propeller shell, a screw rod, a nut, a feathering control rod and a reverse-feathering control rod; the stepped root part of the paddle is rotatably and angularly variably arranged in the stepped through hole in the paddle sleeve of the paddle shell, and the end surface of the paddle root is fixedly provided with an eccentric pin; the positive and negative motors are fixed in the shallow circular groove at the front end of the paddle shell; two ends of the screw rod are rotatably arranged in the grooves on the inner walls of the front end surface and the rear end surface of the paddle shell; a driving shaft of the positive and negative motor penetrates through a through hole formed in the front end face of the paddle shell and is coaxially connected with the screw rod through a key groove; the screw nut is in threaded connection with the screw rod, a circle of rectangular groove is formed in the peripheral wall of the screw nut, and the eccentric pin of each paddle is arranged in the rectangular groove; the feathering stroke control rod comprises a fixed loop bar fixed on the front end wall of the paddle shell and a contact head which is connected in an inner hole of the fixed loop bar in a telescopic and anti-falling way; the reverse paddle stroke control rod is fixed on the front end wall of the paddle shell, and the front end of the reverse paddle stroke control rod directly extends out of the contact or is connected with the contact in a falling-off prevention manner; the forward and reverse motors stop running at the moment that the screw nut leaves the contact of the feathering stroke control rod, feathering stops, and the propeller feathers; when the screw nut pushes the feathering stroke control rod contact to move towards the motor direction, the screw nut can stop at a position between the positions of the screw nut on the screw rod during feathering and during reverse feathering according to the angle of the blade angle selected by the blade angle control panel; the screw nut stops running when the positive and negative motors are connected with the contact of the reverse propeller stroke control rod at the top, the reverse propeller stops running, and the propeller reverses propeller; the feathering control button, the reverse feathering control button and the blade angle control button are arranged on a panel of the aircraft cab during the taking off and normal flying of the normal aircraft.

Further preferably, the structure that the both ends of the lead screw are rotatably installed in the grooves of the inner walls of the front end and the rear end of the paddle shell is that: the bearing steel ball bracket is arranged in the mounting groove formed in the inner wall of the rear end face of the paddle shell, the front end face of the bearing steel ball bracket is provided with a bearing steel ball accommodating groove, the rear end face of the lead screw is provided with a bearing steel ball mounting circular groove, and the bearing steel balls are wrapped and extruded in the bearing steel ball bracket mounting groove and the lead screw mounting circular groove; the adjusting screw is in threaded connection with a threaded hole formed in the inner wall of the rear end face of the propeller 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 formed in the inner wall of the front end face of the paddle shell. The mounting structure has small resistance and friction in the rotating process and small damage.

Further preferably, the paddle housing is two-piece, divided into front and rear paddle housings fixed together by screws. The installation of the paddle is convenient.

Further preferably, the connecting thread of the nut and the lead screw is a trapezoidal thread.

By adopting the scheme, the positive and negative motors are started, the motor shaft drives the lead screw to rotate, the nut can generate axial movement, the paddle eccentric pin is arranged in the nut rectangular groove, and the axial movement of the nut enables the paddle eccentric pin to slide along the groove direction of the nut rectangular groove and rotate around the axis of the paddle, so that the variable pitch is realized. The forward and reverse motors stop running at the moment that the screw nut leaves the contact of the feathering stroke control rod, feathering stops, and the propeller feathers; the screw nut stops running when the positive and negative motors are connected with the contact of the reverse propeller stroke control rod at the top, the reverse propeller stops running, and the propeller reverses propeller.

In a word, the motor is used for providing variable-pitch driving force, the functions of variable pitch, feathering and reverse pitch are realized, the structure is simple, and the quality of the propeller is effectively reduced; the propeller pitch control system has the advantages that the problem of oil leakage does not exist, the pitch control speed and the pitch control precision are greatly improved, the phenomena of slow pitch control and incapability of pitch control caused by the oil leakage of the propeller are eliminated, and the quality and the safety of the propeller are improved.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

As shown in fig. 1, the present embodiment includes a forward-reverse motor 1, a paddle housing 9, two or more paddles 3 (three in the present embodiment, which not only operate stably, but also reduce the mass) uniformly distributed on the paddle housing 9, a lead screw 8, a screw nut 4, and feathering and reverse-feathering control rods 10 and 2. The 3 rotatable variable angle ground of notch cuttype root of paddle installs in the notch cuttype through-hole of 9 oar sleeves of oar shell, preferably, oar shell 9 is two-body type, divide into by the front and back oar shell of fix with screw together, the installation of the paddle 3 of being convenient for. An eccentric pin 12 is fixed to the end face of the root of the blade 3. The positive and negative motor 1 is fixed in a shallow circular groove at the front end of the paddle shell 9 by a screw 11. Two ends of the screw rod 8 are rotatably arranged in grooves on the inner walls of the front end surface and the rear end surface of the paddle shell 9; the optimized structure is that the bearing steel ball bracket 7 is arranged in a mounting groove formed on the inner wall of the rear end face of the paddle shell 9, an accommodating groove for the bearing steel ball 5 is formed on the front end face of the paddle shell, a mounting circular groove for the bearing steel ball 5 is formed on the end face of the rear end of the lead screw 8, and the bearing steel ball 5 is wrapped and extruded in the mounting groove for the bearing steel ball bracket 7 and the mounting circular groove for the lead screw 8; the adjusting screw 6 is in threaded connection with a threaded hole formed in the inner wall of the rear end face of the paddle shell 9, and the front end of the adjusting screw is pressed against the rear end face of the bearing steel ball bracket 7 so as to adjust the pressing force of the bearing steel ball 5; the front end of the screw rod 8 is rotatably sleeved in a groove formed in the inner wall of the front end face of the paddle shell 8. The driving shaft of the positive and negative motor 1 penetrates through a through hole formed in the front end face of the paddle shell 9 and is coaxially connected with the lead screw 8 through a key groove. The screw nut 4 is in threaded connection with the screw rod 8, and preferably, the connecting thread of the screw nut 4 and the screw rod 8 is a trapezoidal thread. The peripheral wall of the nut 4 is provided with a circle of rectangular grooves 13, and the eccentric pin 12 of each blade 3 is arranged in the rectangular grooves 13. The feathering stroke control rod 10 comprises a fixed sleeve rod 14 fixed on the front end wall of the paddle shell 9 and a contact 15 telescopically and anti-falling connected in an inner hole of the fixed sleeve rod 14. The reverse paddle stroke control rod 2 is fixed on the front end wall of the paddle shell 9, and the front end of the reverse paddle stroke control rod directly extends out of a contact or is connected with the contact in a mode of preventing the reverse paddle stroke control rod from being pulled out. The screw nut 4 stops running of the forward and reverse motor 1 at the moment of leaving the feathering stroke control rod contact 15, feathering stops, and the propeller feathers; when the screw nut 4 pushes against the feathering stroke control rod contact 15 to move towards the direction of the motor 1, the screw nut 4 can stop at a position between the positions of the screw nut on the screw rod during feathering and during counter-feathering according to the angle of the blade angle selected by the blade angle control panel; the screw 4 stops the operation of the forward and reverse motor 1 at the moment when the contact of the reverse propeller stroke control rod 2 is connected with the top, the reverse propeller stops, and the propeller reverses the propeller. The feathering control button, the reverse feathering control button and the blade angle control button are arranged on a panel of the aircraft cab during the taking off and normal flying of the normal aircraft.

There are, of course, many other embodiments of the invention and modifications and variations of this invention that will be obvious to those skilled in the art may be made without departing from the spirit and scope of the invention, but it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention.