Electric paddle system with magnetic variable pitch

Abstract

An electric paddle system with a magnetic variable pitch comprises a driving motor and a paddle, a variable pitch crank arm is connected to the paddle, an output shaft of the driving motor is a hollow shaft, a variable pitch long pull rod is arranged in the hollow shaft in an up-down sliding and penetrating mode, an upper magnet is fixedly connected to the lower end of the variable pitch long pull rod, and a variable pitch driving box is fixedly connected to the lower portion of the driving motor. A linear motor is fixedly installed on the variable-pitch driving box, the action end of the linear motor is fixedly connected with a lower magnet, a driving transverse rod is fixedly connected to the upper portion of the variable-pitch long pull rod, one end of a connecting rod is hinged to the driving transverse rod, the other end of the connecting rod is hinged to a variable-pitch crank arm, and a lower spring seat is fixedly connected to the portion, on the upper portion of the driving transverse rod, of the variable-pitch long pull rod. An upper spring seat is arranged above the lower spring seat, the upper spring seat is arranged on the variable-pitch long pull rod in a penetrating mode in an up-down sliding mode, a plurality of holes are formed in the upper spring seat, limiting adjusting bolts are arranged in the holes in a penetrating mode, and the limiting adjusting bolts are connected into screw holes in the paddle seat in a screwed mode. The electric paddle system is simple in structure.

Description

Technical Field

[0001] The present invention relates to an electric aircraft, and particularly to an electric paddle system with variable pitch, belonging to the field of aviation technology. Background Art

[0002] For medium and small-sized electric aircraft, configuring a variable pitch paddle system can improve the working efficiency of the rotor compared to a fixed pitch rotor. The existing variable pitch paddle systems basically follow the variable pitch system of a servo motor plus a swashplate or its improvements. Its mechanical structure and principle are disclosed in Chinese Patent CN104369859A. In this structure, the upper swashplate rotates, the lower swashplate does not rotate, the upper swashplate pulls the variable pitch rocker arm through a variable pitch pull rod, and the lower swashplate is driven by a servo motor. The upper swashplate is driven by the lower swashplate. It can be clearly seen from this structure that its mechanical structure is relatively complex, with many components, large weight, many connection points between components, and high requirements for the linkage between components. The variable pitch drive mechanism for unmanned aerial vehicles disclosed in Chinese Patent Application No. 2019214299623 and the variable pitch control system for a rotor of an unmanned aerial vehicle disclosed in Chinese Patent Application No. 201920785234X basically adopt similar mechanical structures and principles. There are no obvious drawbacks when using this structure on a gasoline engine. Since an electric aircraft is driven by a battery, its endurance is significantly negatively correlated with the weight of the aircraft itself. The main function of the variable pitch mechanism is to improve the power efficiency. If the variable pitch mechanism is too heavy, it may not have an obvious advantage in improving the electric efficiency when used on an electric aircraft. Moreover, in the current variable pitch mechanisms, a bearing is required to be used for rotational isolation between the variable pitch drive arm and the main shaft of the aircraft (i.e., it cannot rotate with the main shaft). The rotational speed of the rotor is generally high, and the requirements and assembly accuracy for the bearing are both high. Also, the bearing will heat up during rotation, and in many cases, the bearing is exposed and is easily contaminated by dust during use, resulting in poor operation. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above problems existing in the variable pitch of current electric aircraft and provide an electric paddle system with variable pitch.

[0004] For each pair to implement the present invention, the following technical solutions are adopted: An electric paddle system with magnetic variable pitch, including a driving motor, a paddle base fixedly connected to the output shaft of the motor, a paddle blade rotatably connected to the side of the paddle base, a variable pitch crank arm connected to the paddle blade, the output shaft of the driving motor is a hollow shaft, a variable pitch long pull rod is coaxially slid up and down in the hollow shaft, both ends of the variable pitch long pull rod extend out of the driving motor, an upper magnet is fixedly connected to the lower end of the variable pitch long pull rod, a variable pitch driving box is fixedly connected to the lower part of the driving motor, a linear motor is fixedly installed on the variable pitch driving box, the moving end of the linear motor is directly or indirectly fixedly connected with a lower magnet, the lower magnet and the upper magnet are opposite to each other up and down and have opposite polarities, a driving cross bar is fixedly connected to the upper part of the variable pitch long pull rod, one end of a connecting rod is hinged to the driving cross bar and the other end is hinged to the variable pitch crank arm, a lower spring seat is fixedly connected to the variable pitch long pull rod above the driving cross bar, an upper spring seat is arranged above the lower spring seat, the upper spring seat is slid up and down through the variable pitch long pull rod, the upper and lower ends of the spring respectively abut against the upper spring seat and the lower spring seat, a plurality of holes are formed in the upper spring seat, a limit adjusting bolt is inserted into the holes, the limit adjusting bolt is screwed into a threaded hole on the paddle base, and the upper spring seat abuts against the head of the limit adjusting screw.

[0005] Further; a flat thrust bearing is installed on the lower end face of the motor, and the variable pitch long pull rod passes through the flat thrust bearing.

[0006] Further; a fixed cover is fixedly connected to the paddle base, a movable cover is slidably engaged with the fixed cover up and down, the upper spring seat is fixedly connected to the movable cover, the lower spring seat and the spring are both located in the cover body formed by the movable cover and the fixed cover, and the driving cross bar extends out through a long hole on the side of the fixed cover.

[0007] Further; an arc plate is fixedly connected to the root of the paddle blade, a threaded hole is machined in the center of the arc plate, a plurality of weight blocks are inserted onto a screw and then the screw is inserted into the threaded hole in the middle, and the weight blocks are fixedly connected to the arc plate. When the weights are directly above the root of the paddle blade, the length of the spring is the longest.

[0008] The positive and beneficial technical effects of the present invention are as follows: This electric paddle system is configured with a variable pitch system. The variable pitch system has a simple structure, light weight, few connection points, and uses magnetic non-contact variable pitch. The variable pitch long pull rod can rotate with the paddle, eliminating the bearing isolation between the main shaft and the variable pitch mechanism, and reducing the probability of system failures. Description of the Drawings

[0009] Figure 1 It is a schematic diagram of the first orientation of the present invention.

[0010] Figure 2 It is a schematic diagram of the second orientation of the present invention.

[0011] Figure 3 It is a schematic diagram of the vertical section in the first direction of the present invention.

[0012] Figure 4 It is a schematic diagram of the vertical section in the second direction of the present invention. Detailed implementation manners

[0013] To more fully explain the implementation of the present invention, implementation examples of the present invention are provided. These implementation examples are only elaborations of the present invention and do not limit the scope of the present invention.

[0014] The present invention is further explained in detail with reference to the accompanying drawings. The reference numerals in the drawings are as follows: 1: driving motor; 2: paddle base; 3: paddle blade; 4: pitch-changing crank arm; 5: pitch-changing drive box; 6: linear motor; 7: pitch-changing long pull rod; 8: movable cover; 9: upper spring seat; 10: limit adjusting bolt; 11: fixed cover; 12: arc-shaped plate; 13: weight block; 14: screw; 15: driving cross bar; 16: connecting rod; 17: upper magnet; 18: action end of the linear motor; 19: lower magnet; 20: lower spring seat; 21: spring; 22: planar thrust bearing.

[0015] As shown in the attached drawings, an electric propeller system with magnetic variable pitch includes a driving motor 1. A propeller base 2 is fixedly connected to the output shaft of the motor. A propeller blade 3 is rotatably connected to the side of the propeller base. A "7"-shaped variable pitch crank arm 4 is connected to the propeller blade. The output shaft of the driving motor is a hollow shaft. A variable pitch long pull rod 7 is coaxially slid up and down in the hollow shaft. Both ends of the variable pitch long pull rod extend out of the motor. A flat thrust bearing 22 is installed on the lower end face of the motor. The flat thrust bearing is to prevent the variable pitch long pull rod from colliding with the driving motor in case the spring fails, resulting in an accident. The variable pitch long pull rod passes through the flat thrust bearing. A upper magnet 17 is fixedly connected to the lower end of the variable pitch long pull rod. A variable pitch driving box 5 is fixedly connected to the lower part of the driving motor. A linear motor 6 is fixedly installed on the variable pitch driving box. The moving end 18 of the linear motor is directly or indirectly fixedly connected to a lower magnet 19. The lower magnet and the upper magnet are opposite to each other vertically and have opposite polarities. Both the upper magnet and the lower magnet are located in the variable pitch driving box. The variable pitch driving box is made of non-metallic material. A driving cross bar 15 is fixedly connected to the upper part of the variable pitch long pull rod. One end of a connecting rod 16 is hinged to the driving cross bar and the other end is hinged to the variable pitch crank arm 4. The up and down movement of the variable pitch long pull rod along the axis drives the driving cross bar to move synchronously. The up and down movement of the driving cross bar drives the variable pitch crank arm 4 to rotate around the rotation axis of the propeller blade through the connecting rod 16, thereby realizing variable pitch. A lower spring seat 20 is fixedly connected to the variable pitch long pull rod above the driving cross bar. An upper spring seat 9 is arranged above the lower spring seat 20. The upper spring seat 9 slidably passes through the variable pitch long pull rod up and down. The upper end and the lower end of a spring 21 respectively abut against the upper spring seat 9 and the lower spring seat 20. A plurality of holes are formed in the upper spring seat. Limiting adjusting bolts 10 are inserted into the holes. The limiting adjusting bolts are screwed into the screw holes on the propeller base. By rotating the limiting adjusting bolts, the force of the spring can be adjusted. The upper spring seat abuts against the head of the limiting adjusting screw. In this embodiment, a fixed cover 11 is fixedly connected to the propeller base. A movable cover 8 is slidably matched with the fixed cover up and down. The upper spring seat 9 is fixedly connected to the movable cover 8. The lower spring seat and the spring are both located in the cover body formed by the movable cover and the fixed cover. The driving cross bar 15 passes through a long hole on the side of the fixed cover.

[0016] As a further optimization, an arc-shaped plate 12 is fixedly connected to the root of the propeller blade. A threaded hole is machined in the center of the arc-shaped plate. A plurality of circular weight blocks 13 are inserted onto screws, and then the screws are inserted into the threaded hole in the middle. The weight blocks are fixedly connected to the arc-shaped plate. When the weight blocks are directly above the root of the propeller blade (in the vertical direction), the length of the spring is the longest, that is, when the weight blocks are in the vertical direction, the weights do not exert a component force on the spring. The function of the weights is to quickly restore the propeller blade to the initial position. When the magnetic force pushes the variable pitch long pull rod to move, a variable pitch occurs, and the weights rotate along with it, and they have a tendency to return to the initial position by themselves.

[0017] When the present invention works, the linear motor drives the upper magnet to move up and down, and the upper magnet moves simultaneously under the repulsive force of the lower magnet, driving the variable pitch long pull rod to move up and down to achieve variable pitch. During the process of variable pitch, the variable pitch long pull rod rotates with the paddle seat (main shaft) without affecting the realization of variable pitch.

[0018] After the embodiments of the present invention are described in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent application. Any simple modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present invention all belong to the scope of the technical solution of the present invention, and the present invention is not limited to the embodiments described in the specification.

Claims

1. An electric propeller system with magnetic variable pitch, comprising a driving motor, a propeller base fixedly connected to the output shaft of the motor, a propeller blade rotatably connected to the side of the propeller base, and a "7"-shaped variable pitch crank arm connected to the propeller blade, characterized in that: The output shaft of the driving motor is a hollow shaft. A variable pitch long pull rod is coaxially and slidably inserted up and down in the hollow shaft. Both ends of the variable pitch long pull rod extend out of the motor. An upper magnet is fixedly connected to the lower end of the variable pitch long pull rod. A variable pitch drive box is fixedly connected to the lower part of the motor. A linear motor is fixedly installed on the variable pitch drive box. The moving end of the linear motor is directly or indirectly fixedly connected to a lower magnet. The lower magnet and the upper magnet are opposite to each other vertically and have opposite polarities. A driving cross bar is fixedly connected to the upper part of the variable pitch long pull rod. One end of the connecting rod is hinged to the driving cross bar and the other end is hinged to the variable pitch crank arm. A lower spring seat is fixedly connected to the variable pitch long pull rod above the driving cross bar. An upper spring seat is arranged above the lower spring seat. The upper spring seat is slidably inserted up and down on the variable pitch long pull rod. The upper end and the lower end of the spring respectively abut against the upper spring seat and the lower spring seat. A plurality of holes are formed in the upper spring seat. Limiting adjustment bolts are inserted through the holes. The limiting adjustment bolts are screwed into the screw holes on the paddle seat. The upper spring seat abuts against the heads of the limiting adjustment screws.

2. The electric paddle system with magnetic pitch change according to claim 1, characterized in that: A flat thrust bearing is installed on the lower end face of the motor. The variable pitch long pull rod passes through the flat thrust bearing.

3. The electric paddle system with magnetic variable pitch according to claim 1, characterized in that: A fixed cover is fixedly connected to the paddle seat. A movable cover is slidably engaged with the fixed cover up and down. The upper spring seat is fixedly connected to the movable cover. The lower spring seat and the spring are both located in the cover body formed by the movable cover and the fixed cover. The driving cross bar extends out of the long hole on the side of the fixed cover.

4. The electric paddle system with magnetic pitch change according to claim 1, wherein: An arc-shaped plate is fixedly connected to the root of the paddle blade. A threaded hole is machined in the center of the arc-shaped plate. After a plurality of weight blocks are inserted on the screw, the screw is inserted into the threaded hole in the middle. The weight blocks are fixedly connected to the arc-shaped plate. When the weight blocks are directly above the root of the paddle blade, the length of the spring is the longest.

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