Double-motor coaxial different-direction double-propeller structure of electric paraglider

Abstract

The invention discloses a double-motor coaxial different-direction double-paddle structure of an electric paraglider, which comprises a cylindrical mounting shaft with a middle hole inside, and a first brushless motor, a first paddle component, a second brushless motor and a second paddle component are fixedly sleeved on the mounting shaft in sequence; the first paddle assembly is in transmission connection with the first brushless motor, the second paddle assembly is in transmission connection with the second brushless motor, and during flight, the first brushless motor and the second brushless motor respectively drive the first paddle assembly and the second paddle assembly to rotate in opposite directions.

Description

Technical Field

[0001] The invention relates to the field of paragliding, and in particular to a double-motor coaxial double-propeller structure in different directions for an electric paraglider. Background Art

[0002] The wing of a paraglider is the main component that generates lift and bears load. During flight, the two propellers can offset each other's torque generated by the rotation of the blades, so that no deflection force is generated during operation, preventing the operator from being deflected. Therefore, most paragliders use a double-propeller structure.

[0003] At present, the double-propeller structures on the market all adopt a single-motor driven solution, such as the patent with application number CN202310783778.3, which discloses a purely electrically driven multi-propeller powered glider, including a frame, a propulsion device and a power supply device. The propulsion device includes a drive motor and a propeller. The propeller is located at the rear side of the frame. A protective frame is provided on the frame. The drive motor includes an outer rotor and an inner stator. An output shaft 1 is provided on the outer rotor, and a reversing mechanism is provided inside the inner stator. The output end of the reversing mechanism is connected to the output shaft 2, and the input end of the reversing mechanism is connected to the output shaft 1. The output shaft 1 passes axially through the center of the output shaft 2. The output shaft 1 and the output shaft 2 can rotate relative to each other. The reversing mechanism receives the power output by the output shaft 1 and transmits it to the output shaft 2, so that the output shaft 2 outputs a rotational power in the opposite direction to the output shaft 1. The output shaft 1 and the output shaft 2 are both connected to propellers. When the drive motor is started, the output shaft 1 and the output shaft 2 respectively drive the two propellers to rotate, so that the rotation directions of the two propellers are opposite, so that the yaw torques generated by the two propellers offset each other.

[0004] In the above patent, a complex transmission structure is used to perform switching, thereby ensuring that the two blades rotate in opposite directions, but this will greatly increase the complexity of the transmission structure, and in this structure, the two blades are always in a synchronized state. Summary of the invention

[0005] Based on the deficiencies in the prior art, the present invention provides a dual-motor coaxial, dual-propeller structure in different directions for an electric paraglider.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: the electric paraglider has a dual-motor coaxial and non-rotating dual-propeller structure, including a cylindrical mounting shaft with a central hole inside, on which a first brushless motor, a first blade assembly, a second brushless motor and a second blade assembly are rotatably sleeved in sequence, the first blade assembly is transmission-connected to the first brushless motor, and the second blade assembly is transmission-connected to the second brushless motor. During flight, the first brushless motor and the second brushless motor respectively drive the first blade assembly and the second blade assembly to rotate in opposite directions.

[0007] Preferably, two groups of power lines are provided in the middle hole, and the two groups of power lines pass through the side wall of the mounting shaft and are respectively connected to the first brushless motor and the second brushless motor.

[0008] Preferably, the first stator assembly and the second stator assembly have the same structure, and both include an annular stator winding fixed to the outer side wall of the mounting shaft.

[0009] Preferably, the first rotor assembly and the second rotor assembly have the same structure, both comprising a rotor housing and two permanent magnet blocks with different polarities embedded in the rotor housing, and the rotor housing surrounds the stator winding inside.

[0010] Preferably, the rotor shell includes a first end shell, a middle shell and a second end shell, the middle shell is a circular ring structure, the first end shell and the second end shell are detachably connected to the openings at both ends of the middle shell, and the first end shell and the second end shell are provided in the middle with through holes for the installation shaft to pass through.

[0011] Preferably, the first end shell and the second end shell both include an outer ring body, an inner ring body and a plurality of connecting columns arranged on the outer ring body and the inner ring body to connect the two; the connecting columns are distributed in an array to form hollow through holes between adjacent connecting columns.

[0012] Preferably, a bearing is provided between the inner ring body and the mounting shaft, and the inner ring body is rotatably connected to the mounting shaft via the bearing.

[0013] Preferably, a plurality of mounting columns are provided on the connecting column, and the mounting columns pass through the blade assembly and are locked and fixed by locking members.

[0014] Preferably, the inner wall of the mounting shaft is provided with a plurality of threaded columns and the outer ends of the threaded columns are fixed with covers by screws, the inner end sleeve of the mounting shaft is provided with a mounting seat, the middle part of the mounting seat is provided with a threading hole, the wall of the threading hole is provided with an annular platform, the inner end of the mounting shaft abuts against the annular platform and is locked by means of screws passing through the annular platform, the side wall of the mounting seat is provided with radial screws to fix the mounting seat to the mounting shaft, the outer side wall of the mounting seat is provided with a plurality of mounting ears distributed in a circular array, and the mounting ears are provided with fasteners to fix the mounting seat.

[0015] Preferably, the mounting shaft comprises a first shaft body and a second shaft body that are butted together. The butt joint between the first shaft body and the second shaft body is a non-circular structure and is provided with a connecting sleeve to sleeve the butt joint inside. The first shaft body and the connecting sleeve are locked and fixed by fasteners. A strip hole is provided on the second shaft body. The second shaft body is limited by a fastener passing through the strip hole so that the second shaft body has space for movement in the axial direction. Relative annular mounting platforms are provided inside the second shaft body and the first shaft body, and a number of axially extending adjustable pressure gas springs are provided between the annular mounting platforms.

[0016] Compared with the prior art, the advantages of the present invention are as follows: the present application sets a hollow mounting shaft, and the middle hole of the mounting shaft is used for wiring. In addition, two brushless motors and two blade assemblies are installed on the mounting shaft. The two brushless motors respectively drive the two blade assemblies to rotate in opposite directions, which offsets the torque generated when the blades rotate, so that no deflection force is generated during operation to cause the person to deflect. When the rear blades are in operation, the wind will be blown forward to drive the front blades to rotate, so that the front motor is more efficient when operating. In addition, the hollow design can help reduce weight and improve heat dissipation capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 A three-dimensional diagram of the present application (with a paddle assembly);

[0019] Figure 2 This is a side view of the present application (with a paddle assembly);

[0020] Figure 3 This is an exploded view of the present application (with blade assembly);

[0021] Figure 4 This is the exploded view of this application (excluding the blade assembly);

[0022] Figure 5 A cross-sectional view of the present application (excluding the blade assembly);

[0023] Figure 6 A three-dimensional diagram of the present application (excluding the blade assembly);

[0024] Figure 7 and Figure 8 It is a three-dimensional diagram of a brushless motor;

[0025] In the figure: 10, mounting shaft; 100, middle hole; 101, first shaft body; 1011, 1022, annular mounting platform; 102, second shaft body; 1021, strip hole; 103, connecting sleeve; 104, gas spring; 20, first brushless motor; 30, second brushless motor; 301, first end shell; 3010, bearing; 3011, 3031, outer ring body; 3012, 3032, connecting column; 3013, 3033, inner ring body; 302, middle shell; 303, second end shell; 3034, mounting column; 40, first blade assembly; 50, second blade assembly; 60, mounting seat; 601, mounting ear; 602, threading hole; 603, annular platform; 70, cover. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0027] Example 1

[0028] The electric paraglider has a dual-motor coaxial dual-propeller structure with different directions, such as Figure 1-8 As shown, it includes a cylindrical installation shaft 10 with an axial center hole 100 inside, and the first brushless motor 20, the first blade assembly 40, the second brushless motor 30 and the second blade assembly 50 are rotatably sleeved on the installation shaft 10 in sequence, the first blade assembly 40 is connected to the first brushless motor 20 by transmission, and the second blade assembly 50 is connected to the second brushless motor 30 by transmission. During flight, the first brushless motor 20 and the second brushless motor 30 respectively drive the first blade assembly 40 and the second blade assembly 50 to rotate in opposite directions. In this scheme, a hollow installation shaft 10 is set in the center hole 100 of the installation shaft 10 for wiring. In addition, two brushless motors and two blade assemblies are installed on the installation shaft 10. The two brushless motors drive the two blade assemblies to rotate in opposite directions respectively, which offsets the torque generated when the blades rotate, so that no deflection force is generated during operation and the person is deflected. When the rear blade is running, the wind will be blown forward to drive the front blade to rotate, so that the front motor is more efficient when running.

[0029] Preferably, two sets of power lines are arranged in the middle hole 100, and the two sets of power lines pass through the side wall of the installation shaft 10 and are respectively connected to the first brushless motor 20 and the second brushless motor 30. In this solution, there is a large space in the installation shaft 10, which is more conducive to wiring.

[0030] Preferably, the first stator assembly and the second stator assembly have the same structure, and both include an annular stator winding fixed to the outer wall of the mounting shaft 10. In this solution, the annular stator winding is arranged outside the mounting shaft 10, and different coils are energized at different positions by switching circuits to generate different magnetic fields, thereby driving the rotor assembly to rotate. Generally, six coils are arranged, two in a group, divided into three groups, and the three groups are switched and energized.

[0031] Preferably, the first rotor assembly and the second rotor assembly have the same structure, both comprising a rotor housing and two permanent magnet blocks with different polarities embedded in the rotor housing, and the rotor housing surrounds the stator winding inside. The permanent magnet blocks drive the rotor assembly to rotate under the action of the electromagnetic field generated by the coil, and the rotation of the rotor assembly drives the blade assembly to rotate.

[0032] Preferably, the rotor housing includes a first end housing 301, a middle housing 302 and a second end housing 303. The middle housing 302 is a circular ring structure. The first end housing 301 and the second end housing 303 are detachably connected to the openings at both ends of the middle housing 302. A through hole for the installation shaft 10 to pass through is provided in the middle of the first end housing 301 and the second end housing 303. A space is left between the middle housing 302 and the installation shaft 10 for installing the rotor assembly and the stator assembly.

[0033] Preferably, the first end housing 301 and the second end housing 303 both include an outer ring body 3011, 3031, an inner ring body 3013, 3033, and a plurality of connecting posts 3012, 3032 disposed on the outer ring body 3011, 3031 and the inner ring body 3013, 3033 to connect the two; the connecting posts 3012, 3032 are arranged in an array, and hollow through holes are formed between adjacent connecting posts 3012, 3032. The hollow through holes can enhance the heat dissipation at this position, ensure that the brushless motor is at a suitable temperature when working, and avoid damage to the brushless motor due to high temperature.

[0034] Preferably, a bearing is provided between the inner ring body 3013, 3033 and the installation shaft 10, and the inner ring body 3013, 3033 is rotatably connected to the installation shaft 10 through the bearing. This solution provides a rotational matching structure between the rotor assembly and the installation shaft 10, and specifically, bearings are provided at the inner ring bodies 3013, 3033 at both ends.

[0035] Preferably, a plurality of mounting columns 3034 are provided on the connecting columns 3012 and 3032, and the mounting columns 3034 are fixed by locking members after passing through the blade assembly. The mounting columns 3034 only need to be provided on one side where the blade assembly is installed, and the mounting columns 3034 are used to install the blade assembly, and the blade assembly includes two blade monomers. The locking members in this solution are locking bolts, and when locking, a pressure plate with a circular hole is provided to press on the blade monomer, and the mounting columns 3034 are locked by locking bolts after passing through the blade monomer and the circular hole. After the pressure plate is provided, it is not necessary to provide locking bolts on each mounting column 3034, and at least two locking bolts are required to fix the two blade monomers.

[0036] Preferably, the inner wall of the mounting shaft 10 is provided with a plurality of threaded columns and the outer ends of the threaded columns are fixed with a cover 70 by screws. The inner end of the mounting shaft 10 is sleeved with a mounting seat 60, the middle of the mounting seat 60 is provided with a threading hole 602, the hole wall of the threading hole 602 is provided with an annular platform 603, the inner end of the mounting shaft 10 is against the annular platform 603 and is locked by screws passing through the annular platform 603, the side wall of the mounting seat 60 is provided with radial screws to fix the mounting seat 60 to the mounting shaft 10, the outer side wall of the mounting seat 60 is provided with a plurality of mounting ears 601 distributed in a circular array, and the mounting ears 601 are provided with fasteners to fix the mounting seat 60. The mounting seat 60 is used to be fixed with other components, such as the frame of a paraglider.

[0037] Preferably, the mounting shaft 10 includes a first shaft body 101 and a second shaft body 102 that are butt-jointed. The joint between the first shaft body 101 and the second shaft body 102 is a non-circular structure and is provided with a connecting sleeve 103 to sleeve the joint inside. The first shaft body 101 and the connecting sleeve 103 are locked and fixed by fasteners. A strip hole 1021 is provided on the second shaft body 102. The second shaft body 102 is limited by a fastener passing through the strip hole 1021 so that the second shaft body 102 has space for movement in the axial direction. Relative annular mounting platforms 1011, 1022 are provided in the second shaft body 102 and the first shaft body 101, and a number of axially extending adjustable pressure gas springs 104 are provided between the annular mounting platforms 1011, 1022. In this solution, the installation shaft 10 is set to be two-stage, which provides conditions for the separate disassembly of the two. In addition, the second shaft body 102 is a movable connection structure. The screws on the second shaft body 102 can move within the range of the bar hole 1021, and are supported by the gas spring 104 during the movement. During the flight, the gas spring 104 adaptively adjusts the spacing according to the axial force. The setting of a double-propeller structure during flight will cause aerodynamic interference problems, and adjusting the spacing is one of the ways to reduce aerodynamic interference. The sliding structure set in this solution increases the spacing between the two blades in a small range according to the resistance and the thrust caused by the rotation of the blades during flight, thereby reducing aerodynamic interference.

[0038] It should be noted that the motor rotor and stator winding are not shown in the drawings.

[0039] The above is an introduction to the dual-motor coaxial and non-rotating dual-propeller structure of the electric paraglider provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. The electric paraglider has a dual-motor coaxial and dual-propeller structure with different directions, which is characterized by: It includes a cylindrical installation shaft with a central hole inside, on which a first brushless motor, a first blade assembly, a second brushless motor and a second blade assembly are rotatably sleeved in sequence, the first blade assembly is transmission-connected to the first brushless motor, and the second blade assembly is transmission-connected to the second brushless motor. During flight, the first brushless motor and the second brushless motor respectively drive the first blade assembly and the second blade assembly to rotate in opposite directions.

2. The electric paraglider double-motor coaxial double-propeller structure according to claim 1 is characterized in that: Two groups of power lines are arranged in the middle hole, and the two groups of power lines pass through the side wall of the installation shaft and are respectively connected with the first brushless motor and the second brushless motor.

3. The electric paraglider double-motor coaxial double-propeller structure according to claim 1 is characterized in that: The first stator assembly and the second stator assembly have the same structure, and both include an annular stator winding fixed to the outer side wall of the mounting shaft.

4. The electric paraglider structure with two coaxial motors and two propellers in different directions according to claim 3 is characterized in that: The first rotor assembly and the second rotor assembly have the same structure, both comprising a rotor housing and two permanent magnet blocks with different polarities embedded in the rotor housing, and the rotor housing surrounds the stator winding inside.

5. The electric paraglider double-motor coaxial double-propeller structure according to claim 4 is characterized in that: The rotor shell includes a first end shell, a middle shell and a second end shell. The middle shell is a circular ring structure. The first end shell and the second end shell are detachably connected to the openings at both ends of the middle shell. The first end shell and the second end shell are provided with through holes in the middle for the installation shaft to pass through.

6. The electric paraglider double-motor coaxial double-propeller structure according to claim 5, characterized in that: The first end shell and the second end shell both include an outer ring body, an inner ring body, and a number of connecting columns arranged on the outer ring body and the inner ring body to connect the two; the connecting columns are distributed in an array to form hollow through holes between adjacent connecting columns.

7. The electric paraglider structure with two coaxial motors and two propellers in different directions according to claim 6 is characterized in that: A bearing is arranged between the inner ring body and the installation shaft, and the inner ring body is rotatably connected with the installation shaft through the bearing.

8. The electric paraglider double-motor coaxial double-propeller structure according to claim 6, characterized in that: A plurality of mounting columns are arranged on the connecting column, and the mounting columns are locked and fixed by locking pieces after passing through the blade assembly.

9. The electric paraglider double-motor coaxial double-propeller structure according to claim 1, characterized in that: The inner wall of the mounting shaft is provided with a plurality of threaded columns, and the outer ends of the threaded columns are fixed with covers by screws, the inner end sleeve of the mounting shaft is provided with a mounting seat, the middle part of the mounting seat is provided with a threading hole, the wall of the threading hole is provided with an annular platform, the inner end of the mounting shaft is against the annular platform and is locked by screws passing through the annular platform, the side wall of the mounting seat is provided with radial screws to fix the mounting seat to the mounting shaft, the outer side wall of the mounting seat is provided with a plurality of mounting ears distributed in a circular array, and the mounting ears are provided with fasteners to fix the mounting seat.

10. The electric paraglider double-motor coaxial double-propeller structure according to claim 1 or 9, characterized in that: The mounting shaft comprises a first shaft body and a second shaft body which are butted together. The butt joint of the first shaft body and the second shaft body is a non-circular structure and is provided with a connecting sleeve to sleeve the butt joint inside. The first shaft body and the connecting sleeve are locked and fixed by fasteners. A strip hole is provided on the second shaft body. The second shaft body is limited by a fastener passing through the strip hole so that the second shaft body has space for movement in the axial direction. Relative annular mounting platforms are provided in the second shaft body and the first shaft body, and a number of axially extending adjustable pressure gas springs are provided between the annular mounting platforms.

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