CN114476026A - Opening and closing paddle and electric vertical take-off and landing aircraft - Google Patents
Opening and closing paddle and electric vertical take-off and landing aircraft Download PDFInfo
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- CN114476026A CN114476026A CN202210152915.9A CN202210152915A CN114476026A CN 114476026 A CN114476026 A CN 114476026A CN 202210152915 A CN202210152915 A CN 202210152915A CN 114476026 A CN114476026 A CN 114476026A
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- paddle
- assembly
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- opening
- blade
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/46—Arrangements of, or constructional features peculiar to, multiple propellers
- B64C11/48—Units of two or more coaxial propellers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/04—Helicopters
- B64C27/08—Helicopters with two or more rotors
- B64C27/10—Helicopters with two or more rotors arranged coaxially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/04—Helicopters
- B64C27/12—Rotor drives
- B64C27/14—Direct drive between power plant and rotor hub
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/22—Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/22—Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft
- B64C27/28—Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft with forward-propulsion propellers pivotable to act as lifting rotors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C2230/00—Boundary layer controls
- B64C2230/14—Boundary layer controls achieving noise reductions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C2230/00—Boundary layer controls
- B64C2230/28—Boundary layer controls at propeller or rotor blades
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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Abstract
Provided are an opening and closing paddle and an electric vertical take-off and landing aircraft. The opening and closing paddle (1) comprises an upper paddle assembly (11), a lower paddle assembly (12) and a transmission shaft assembly (13), wherein the upper paddle assembly (11) and the lower paddle assembly (12) are coaxially connected to the transmission shaft assembly (13), one of the upper paddle assembly (11) and the lower paddle assembly (12) is fixedly connected to the transmission shaft assembly (13), and the other one of the upper paddle assembly (11) and the lower paddle assembly (12) can rotate around the transmission shaft assembly (13) relative to the one in one plane, so that the upper paddle assembly (11) and the lower paddle assembly (12) can be switched between a state of being parallel to each other and a state of being intersected with each other.
Description
Technical Field
The application relates to the technical field of aircrafts, in particular to an opening and closing paddle and an electric vertical take-off and landing aircraft.
Background
Currently, as a new type of medium-short distance air vehicle, the evtol (electric Vertical take off and landing) electric Vertical take-off and landing aircraft achieves near zero emission while having the advantages of high safety, low noise, low manufacturing cost, low operating cost, and the like, and thus attracts wide attention including aerospace enterprises, automobile industries, transportation industries, governments, military and academic circles. In addition, the electric vertical take-off and landing aircraft has the characteristics of safety, reliability (no explosion and fuel leakage), simple structure, simplicity and convenience in operation and use, good maintainability/low cost, good economy and the like.
For the composite wing electric vertical take-off and landing aircraft and the tilt wing electric vertical take-off and landing aircraft, after the electric vertical take-off of the lift paddles is completed, in the flat flight stage, the lift paddles are in a static state, and in order to reduce the resistance in the flat flight process, the direction of the lift paddles is locked in the downwind direction by a motor, so that the two-blade paddles are generally adopted. However, the two paddles achieve the same pulling force and need a faster rotating speed, so that the wing tip speed of the paddles is higher, further the generated noise is higher, and the two paddles are very unfriendly to passengers and external personnel.
The utility model discloses a chinese utility model patent that publication number is CN214190098U, application number is 202022260455.0 discloses a VTOL aircraft, and its oar that rises is two paddles, when taking off, because the rotational speed leads to the noise great fast, hardly satisfies the environmental requirement of taking off and land in the city, and its noise also is great to inside passenger's influence, and it is relatively poor to take the travelling comfort.
Disclosure of Invention
The present application has been made in view of the state of the art described above. The utility model provides an it is the oar and electronic VTOL aircraft that open and shut that can reduce the noise that the paddle produced and reduce air resistance to provide one kind.
A first aspect of the present application provides an opening and closing paddle, which includes an upper paddle assembly, a lower paddle assembly, and a transmission shaft assembly, wherein the upper paddle assembly and the lower paddle assembly are coaxially connected to the transmission shaft assembly, one of the upper paddle assembly and the lower paddle assembly is fixedly connected to the transmission shaft assembly, and the other one of the upper paddle assembly and the lower paddle assembly can rotate around the transmission shaft assembly in a plane relative to the one, so that the upper paddle assembly and the lower paddle assembly can be switched between a state parallel to each other and a state intersecting each other.
In at least one embodiment, the opening and closing paddle has a stop mode in which the upper paddle assembly and the lower paddle assembly are parallel to each other and an operating mode in which the upper paddle assembly and the lower paddle assembly intersect each other.
In at least one embodiment, the transmission shaft assembly includes a transmission shaft fixedly connected to the one of the upper paddle assembly and the lower paddle assembly, and an elastic member generating a torsion force, the elastic member connecting the transmission shaft to the other of the upper paddle assembly and the lower paddle assembly.
In at least one embodiment, the elastic member includes or is a torsion spring, when the opening and closing paddle switches from the stop mode to the working mode, the transmission shaft rotates relative to the other one of the upper paddle assembly and the lower paddle assembly against a torsion force generated by the torsion spring to drive the other one of the upper paddle assembly and the lower paddle assembly to rotate together,
when the opening and closing paddle is switched from the working mode to the stopping mode, the transmission shaft stops rotating, and the other one of the upper paddle assembly and the lower paddle assembly rotates to a position parallel to the one of the upper paddle assembly and the lower paddle assembly through the torsion of the torsion spring.
In at least one embodiment, the upper paddle assembly is fixedly connected to the drive shaft assembly, and the lower paddle assembly is rotatable about the drive shaft assembly.
In at least one embodiment, the lower side of the upper paddle assembly has a first stopper portion, the upper side of the lower paddle assembly has a second stopper portion opposite to the first stopper portion in the circumferential direction of the propeller shaft assembly,
the opening/closing paddle is switched between an operating mode and a stop mode by abutting the first stopper portion against the second stopper portion on both sides in the circumferential direction.
In at least one embodiment, the lower paddle assembly has a third stop portion on an underside thereof, the driveshaft assembly has a fourth stop portion opposite the third stop portion in a circumferential direction of the driveshaft assembly,
the opening/closing paddle is switched between an operating mode and a stop mode by abutting the third stopper portion with the fourth stopper portion on both sides in the circumferential direction, respectively.
In at least one embodiment, when the first stopper portion and the second stopper portion abut in the circumferential direction, the first stopper portion and the second stopper portion are relatively fixed in the axial direction of the propeller shaft assembly.
In at least one embodiment, when the third and fourth stops abut in the circumferential direction, the third and fourth stops are relatively fixed in the axial direction of the driveshaft assembly.
In at least one embodiment, in the operating mode, the upper paddle assembly is at 90 degrees to the lower paddle assembly.
In at least one embodiment, the upper blade assembly comprises two upper blades, an upper blade upper hub, an upper blade lower hub, and fasteners fastening the upper blade upper hub and the upper blade lower hub together, the roots of the two upper blades being held between the upper blade upper hub and the upper blade lower hub, and/or
The lower blade assembly includes two lower blades, a lower blade upper hub, a lower blade lower hub, and fasteners that fasten the lower blade upper hub and the lower blade lower hub together, with root portions of the two lower blades being held between the lower blade upper hub and the lower blade lower hub.
A second aspect of the present application provides an electric VTOL aerial vehicle, comprising:
the opening and closing paddle of any one of the above technical solutions;
a body; and
and the motor is connected with the opening and closing paddle and is used for driving the opening and closing paddle.
By adopting the technical scheme, the upper paddle assembly and the lower paddle assembly of the opening and closing paddle can be switched between a parallel state and an intersected state, and the rotating speed of the paddle required when the opening and closing paddle generates the same pulling force can be reduced when the upper paddle assembly and the lower paddle assembly of the opening and closing paddle work in an intercrossed state, so that the noise generated by the paddle is reduced. When the upper paddle assembly and the lower paddle assembly of the opening and closing paddle are stopped in a state of being parallel to each other, air resistance can be reduced.
Drawings
Fig. 1 is a schematic view illustrating an electric vtol aircraft according to an embodiment of the present application during a level flight phase.
Fig. 2 is a schematic diagram illustrating an electric VTOL aerial vehicle in a takeoff phase and a landing phase according to one embodiment of the present application.
Fig. 3 is an isometric view illustrating an opening and closing paddle and a motor according to an embodiment of the present application.
Fig. 4 is an exploded view illustrating an opening and closing paddle according to an embodiment of the present application.
Fig. 5 is an exploded view illustrating an upper paddle assembly of the opening and closing paddle according to an embodiment of the present application.
Fig. 6 is an exploded view illustrating a lower paddle assembly of the opening and closing paddle according to an embodiment of the present application.
Fig. 7 is an isometric view illustrating a drive shaft assembly of an opening and closing paddle according to an embodiment of the present application.
Fig. 8 is a sectional view illustrating an opening and closing paddle according to an embodiment of the present application.
Fig. 9 is a perspective view illustrating a lower-paddle lower hub and an upper-paddle shaft according to an embodiment of the present application.
Fig. 10 is a perspective view illustrating an upper-paddle lower hub and a lower-paddle upper hub according to an embodiment of the present application.
Description of the reference numerals
1 opening and closing paddle
11 go up oar assembly
111 Upper blade
112 upper paddle and upper hub
113 upper propeller and lower propeller hub
12 lower paddle assembly
121 lower blade
122 lower propeller and upper propeller hub
123 lower propeller hub
13 transmission shaft assembly
131 upper propeller shaft
132 bearing
133 torsion spring
2 machine body
3 electric machine
4 pushing oar
Detailed Description
Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the present application, and is not intended to be exhaustive or to limit the scope of the application.
The application relates to an opening and closing paddle and an electric vertical take-off and landing aircraft comprising the same. In the present embodiment, the electric vertical take-off and landing aircraft is sometimes referred to as an eVTOL, eVTOL aircraft, or aircraft. Fig. 1 shows the opening and closing paddle of the present application when the electric vertical take-off and landing aircraft is flying flat, and fig. 2 shows the opening and closing paddle of the present application when the electric vertical take-off and landing aircraft is taking off and landing. When taking off and landing, the opening and closing paddle 1 rotates, the lower paddle assembly is under the action of inertia force, so that the upper paddle assembly and the lower paddle assembly are in a cross structure to generate upward pulling force, and under the condition of the same pulling force, the rotating speeds of the blades of the upper paddle assembly and the lower paddle assembly in the cross structure are lower, so that the generated air noise is lower, and the purpose of reducing the noise is realized.
When the aircraft flies flatly, the opening and closing paddle 1 stops rotating, the lower paddle assembly returns to the original position to be in a straight-line structure under the torsion of a torsion spring of the transmission shaft assembly, and at the moment, the opening and closing paddle is parallel to the advancing direction of the aircraft, so that the pneumatic resistance of the opening and closing paddle along the airflow is minimum, and the range of the electric vertical take-off and landing aircraft is increased.
The structure of this application make full use of oar that opens and shuts satisfies simultaneously electronic VTOL aircraft take off, land the requirement of stage to the low noise and fly the requirement of stage to low air resistance with peaceful. Not only the noise level during taking off and landing is reduced, but also the air resistance is reduced during flat flight.
As shown in fig. 1 and 2, the body 2 may include a fuselage 21, wings 22, and a tail 23 as a whole. A passenger compartment is formed in the body 21 for seating a driver, or a driver and passengers. The wings 22 may be provided at a substantially middle position in the front-rear direction of the fuselage 21, and may extend to both sides in the width direction of the fuselage 21. The empennages 23 may be provided at the rear (rear) portion of the body to extend to both sides in the width direction of the body. The opening and closing propellers 1 are arranged on the wings, connected with a motor 3 (refer to fig. 3) and driven by the motor 3, the propeller 4 is arranged on the tail wing 23, the electric vertical take-off and landing aircraft utilizes a plurality of opening and closing propellers as the lifting propellers to complete take-off and landing, and the horizontal flight is completed by the propeller.
Fig. 3 is an isometric view of the opening and closing paddle 1 and the motor 3, and fig. 4 is an exploded view of the opening and closing paddle 1. The opening and closing paddle 1 comprises an upper paddle assembly 11, a lower paddle assembly 12 and a transmission shaft assembly 13 which are assembled together. The upper blade assembly 11, the lower blade assembly 12 and the transmission shaft assembly 13 are independent structures. The transmission shaft assembly 13 is connected with the motor 3, and the motor 3 drives the transmission shaft assembly 13 to rotate or stop. The upper blade assembly 11 and the lower blade assembly 12 are coaxially connected to the transmission shaft assembly 13. The lower blade assembly 12 is located between the upper blade assembly 11 and the transmission shaft assembly 13, and can rotate around the transmission shaft assembly 13 on a plane within a limited angle range. The upper blade assembly 11 is fixedly connected to the transmission shaft assembly 13 by a fastener such as a bolt, and the upper blade assembly 11 rotates together with the transmission shaft assembly 13.
In the stop mode, the upper blade assembly 11 and the lower blade assembly 12 (i.e., the extending direction or the length direction of the blades) are parallel to the advancing direction of the electric VTOL aerial vehicle. In the operating mode, the upper blade assembly 11 and the lower blade assembly 12 intersect, and preferably, the upper blade assembly 11 and the lower blade assembly 12 are orthogonal, so that the respective rotation speeds of the upper blade assembly 11 and the lower blade assembly 12 can be reduced to the maximum.
Specifically, as shown in fig. 5, upper paddle assembly 11 includes an upper blade 111, an upper paddle upper hub 112, an upper paddle lower hub 113, and a fastener 114. Wherein, the upper blade 111 can be two separate blades, and the blade root is a substantially cylindrical body with a boss. Upper-paddle upper hub 112 and upper-paddle lower hub 113 are components for mounting upper blades 111.
Upper paddle upper hub 112 includes an upper paddle upper hub body 1121 and an upper paddle upper hub flange 1122. The upper paddle upper hub main body 1121 is a member having a certain thickness, and its cross section is semicircular. An upper paddle upper hub limit groove for engaging a boss at the root of the upper blade 111 with the upper paddle upper hub main body 1121 in the length direction of the upper paddle upper hub main body 1121 is provided at a middle position of an inner wall surface of the upper paddle upper hub main body 1121. Upper-paddle upper-hub flanges 1122 protrude from both ends in the width direction of the upper-paddle upper-hub main body 1121, and the upper-paddle upper-hub flanges 1122 on both sides extend in the longitudinal direction of the upper-paddle upper-hub main body 1121, and are provided with a plurality of mounting holes (eight in total in the present embodiment).
The upper-paddle lower hub 113 includes an upper-paddle lower hub body 1131, an upper-paddle lower hub flange 1132, an upper-paddle lower hub extension 1133, and a first stop 1134. The upper-paddle lower-hub main body 1131 is a member having a certain thickness, and the cross section thereof is semicircular, and an upper-paddle lower-hub limit groove is provided at the middle position of the inner wall surface of the upper-paddle lower-hub main body 1131, for engaging the boss at the root of the upper blade 111 with the upper-paddle lower-hub main body 1131 in the length direction of the upper-paddle lower-hub main body 1131. Upper-paddle lower-hub flanges 1132 respectively protrude from both ends in the width direction of the upper-paddle lower-hub main body 1131, and the upper-paddle lower-hub flanges 1132 on both sides extend in the length direction of the upper-paddle lower-hub main body, and are respectively provided with a plurality of mounting holes (for example, eight in total). An upper-lower-paddle hub extension 1133, which is a bottomed cylindrical member provided with a plurality of mounting holes (four, for example) for fixedly connecting the upper-paddle assembly 11 to the drive shaft assembly 13, is integrally formed below the upper-lower-paddle hub main body 1131. A first stopper 1134 is integrally formed on a part of the bottom peripheral edge of the upper paddle lower hub extension, and the first stopper 1134 extends in the up-down direction from the bottom peripheral edge of the upper paddle lower hub extension 1133, and has a circular arc-shaped cross section, where the circular arc-shaped cross section may be a quarter circle.
When the upper paddle assembly 11 is assembled, the upper blades 111 are caught by the upper paddle upper hub 112 and the upper paddle lower hub 113 in the closed cavity formed by the inner wall surface of the upper paddle upper hub main body 1121 and the inner wall surface of the upper paddle lower hub main body 1132. At this time, a part of the inner wall surface of the cavity is in contact with and sealed to a part of upper blade 111, and upper blade 111 extends in the longitudinal direction of upper and lower paddle hub bodies 1121, 1131. And then the upper propeller upper hub 112 and the upper propeller lower hub 113 are fixedly connected through the fastener 114, so that the connection reliability of the upper blade 111 is ensured, and the upper blade 111 cannot be loosened when being stressed.
Further, as shown in fig. 6, lower-paddle assembly 12 includes a lower blade 121, a lower-paddle upper hub 122, a lower-paddle lower hub 123, and a fastener 124. The lower blade 121 may be two separate blades, and the blade root portion is a truncated cone having a small gradient, and the diameter of the truncated cone gradually decreases from the blade root portion side toward the blade tip side, and is configured to engage with an inner wall surface of the lower-paddle upper hub main body 1221 and an inner wall surface of the lower-paddle lower hub main body 1231, which will be described later, in the longitudinal direction of the lower-paddle upper hub main body 1221 and the lower-paddle lower hub main body 1231. Lower-paddle upper hub 122 and lower-paddle lower hub 123 are components for mounting lower blades 121.
The lower-paddle upper hub 122 includes a lower-paddle upper hub body 1221, a lower-paddle upper hub flange 1222, a lower-paddle upper hub extension 1223, and a second stop 1224. The lower-paddle upper-hub body 1221 is a member having a certain thickness, and its cross section is semicircular. An inclined surface is provided at a position of an inner wall surface of lower-paddle upper hub body 1221 corresponding to a root portion of lower blade 121, and engages with the root portion of lower blade 121 in a longitudinal direction of lower-paddle upper hub body 1221. Lower-paddle upper-hub flanges 1222 protrude from both ends of the lower-paddle upper-hub main body 1221 in the width direction, and the lower-paddle upper-hub flanges 1222 on both sides extend along the length direction of the lower-paddle upper-hub main body 1221 and are provided with a plurality of mounting holes (for example, four in total). A lower-paddle upper-hub extension 1223 is integrally formed above the lower-paddle upper-hub main body 1221, and the lower-paddle upper-hub extension 1223 is a through cylindrical member and has a uniform thickness. A second stopper 1224 is integrally formed at a part of the upper peripheral edge of the lower-paddle upper-hub extension 1223, and the second stopper 1224 extends in the up-down direction from the peripheral edge of the lower-paddle upper-hub extension and has a circular arc-shaped cross section, where the circular arc-shaped cross section may be a half circle.
The lower-paddle lower hub 123 includes a lower-paddle lower hub body 1231, a lower-paddle lower hub flange 1232, a lower-paddle lower hub extension 1233, and a third stop 1234. The lower hub main body 1231 is a member having a certain thickness, and has a semicircular cross section, and an inclined surface is provided at a position corresponding to the root of the lower blade 121 on the inner wall surface of the lower hub main body 1231, for engaging with the root of the lower blade 121 in the longitudinal direction of the lower hub main body 1231. Lower-paddle lower-hub flanges 1232 protrude from both ends of the lower-paddle lower-hub main body 1231 in the width direction, respectively, and the lower-paddle lower-hub flanges 1232 on both sides extend in the length direction of the lower-paddle lower-hub main body 1232, and are provided with a plurality of mounting holes (for example, four in total). A lower-paddle lower hub extension 1233 is integrally formed below the lower-paddle lower hub main body 1231, and the lower-paddle lower hub extension 1233 is a through cylindrical member and has a uniform thickness. A third stopper 1234 is integrally formed at a portion of the lower peripheral edge of the lower paddle lower hub extension 1233, and the third stopper 1234 extends in the up-down direction from the bottom of the lower paddle lower hub extension 1233 and has a circular arc cross section, where the circular arc cross section may be a half circle.
When the lower blade assembly 12 is assembled, the lower blade 121 is held by the lower blade upper hub 122 and the lower blade lower hub 123 in a closed cavity formed by an inner wall surface of the lower blade upper hub main body 1221 and an inner wall surface of the lower blade lower hub main body 1231, where a part of the inner wall surface of the cavity is in contact with and sealed against a part of the lower blade 121, and where the lower blade 121 extends along the length direction of the lower blade upper hub main body 1221 and the lower blade lower hub main body 1231. And then the lower-oar upper hub 122 and the lower-oar lower hub 123 are fixedly connected through the fastener 124, so that the connection reliability of the lower blade 121 is ensured, and the lower blade 121 cannot be loosened when being stressed.
Fig. 7 is an isometric view of the drive shaft assembly 13 of the present application. Fig. 8 is a cross-sectional view of the opening and closing paddle of the present application. The propeller shaft assembly 13 includes a prop shaft 131, a bearing 132, and a torsion spring 133.
Specifically, the upper paddle shaft 131 includes a shaft seat 1311, a shaft body 1312, and a fourth stopper 1313. The shaft holder 1311 is a circular member having a center penetrating therethrough. A shaft body 1312 is provided on the inner edge of the shaft holder 1311, and the shaft body 1312 is a cylindrical member having a constant thickness and extending upward in the vertical direction from the inner edge of the shaft holder 1311, and has a circular cross section. A threaded upper-shaft connecting hole 1312a is provided in an upper portion of the shaft body 1312, and the upper-paddle lower hub 113 and the upper-paddle shaft 131 are connected together by the engagement of the fastener 114 with the upper-shaft connecting hole 1312 a. A fourth stopper 1313 is provided at a part of the outer edge of the shaft holder 1311, and the fourth stopper 1313 may have a quarter-circle shape in cross section and extend upward in the vertical direction from the outer edge of the shaft holder 1311. The vertical length of the shaft body 1312 is greater than the vertical length of the fourth stopper 1313, and preferably, the vertical length of the shaft body 1312 is four or more times the vertical length of the fourth stopper 1313.
In addition, the propeller shaft assembly 13 includes two bearings 132 respectively located at upper and lower portions of the upper propeller shaft 131. The bearing 132 is in interference fit with the upper paddle shaft 131 to prevent the bearing 132 from moving on the upper paddle shaft 131 due to a force, and the preferred interference fit amount is 0.05mm-0.1 mm.
Further, the torsion spring 133 passes through the shaft body 1312 between the two bearings 132. A torsion spring 133, having one end connected to the upper paddle shaft 131 and the other end connected to the lower paddle assembly 12, provides a torque force that is positive when the lower paddle assembly 12 is switched from the operating mode to the stopped mode.
Specifically, a first torsion spring mounting hole 133a penetrating in the thickness direction is provided in the lower half portion of the shaft body 1312. A recess 1223a is provided on the surface of the lower-paddle upper hub extension 1223 on the side facing the lower blades 121, and the recess 1223a is a groove extending from the inner edge of the lower-paddle upper hub extension 1223 in the thickness direction and having a semicircular cross section. A recess 1233a is provided on a surface of the lower-paddle lower hub extension 1233 on a side facing the lower blades 121, the recess 1233a is a groove extending from an inner edge of the lower-paddle lower hub extension 1233 in a thickness direction and having a semicircular cross section, and when the lower-paddle upper hub 122 and the lower-paddle lower hub 123 are assembled by the fastener 124, the recess 1223a and the recess 1233a form one hole, i.e., the second torsion spring mounting hole 133 b. The first torsion spring mounting hole 133a is on the opposite side of the axis of the shaft body 1312 from the second torsion spring mounting hole 133b (see fig. 8). One end of the torsion spring 133 is inserted into the first torsion spring connection hole 133a, and the other end is inserted into the second torsion spring connection hole 133 b.
Fig. 8 is a cross-sectional view of the opening and closing paddle of the present application. The upper bearing 132 connects the shaft body 1312 of the upper blade shaft 131 and the lower blade upper hub extension 1223 of the lower blade upper hub 122, and the lower bearing 132 is located below the first torsion spring connection hole 33a and connects the shaft body 1312 of the upper blade shaft 131 and the lower blade lower hub extension 1233 of the lower blade lower hub 123. Thus, the lower paddle assembly 12 is supported by the bearing 132 to be rotatable with respect to the upper paddle shaft 131.
Fig. 9 is a perspective view of the lower-paddle hub 123 and the upper-paddle shaft 131 of the present application. A first catching groove 1313a is provided at one side of the fourth stopping portion 1313 of the upper paddle shaft 131 in the circumferential direction, and a first protrusion 1234a is provided at one side of the third stopping portion 1234 of the lower paddle hub 123 opposite to the first catching groove 1313a in the circumferential direction. When the opening and closing paddle 1 is in the stop mode, the other circumferential side of the fourth stopper 1313, which is opposite to the one circumferential side where the first catching groove 1313a is provided, abuts against the one circumferential side of the third stopper 1234, which is opposite to the other circumferential side where the first protrusion 1234a is provided. When the retractable paddle 1 is switched from the stop mode to the working mode, the upper paddle shaft 131 of the transmission assembly rotates 90 degrees, so that the first engaging groove 1313a of the fourth stopping portion is engaged with (or inserted into) the first protrusion 1234a of the third stopping portion. In this way, the first protrusion 1234a and the first engaging groove 1313a are engaged together to perform a connecting and limiting function, and bear the axial tension generated by the lower blade assembly 12.
Fig. 10 is a perspective view of lower-paddle upper hub 122 and upper-paddle lower hub 113 of the present application. A second projection 1224a is provided on the other circumferential side of the second stopper 1224 of the lower-paddle upper hub 122, and a second locking groove 1134a is provided on the opposite side (i.e., one circumferential side) of the first stopper 1134 of the upper-paddle lower hub 113 in the circumferential direction from the second projection 1224 a. When the opening/closing paddle 1 is in the stop mode, the other circumferential side of the first stopper 1134, which is opposite to the one circumferential side where the second notch 1134a is provided, abuts against the one circumferential side of the first stopper 1134, which is opposite to the other circumferential side where the second notch 1134a is provided. When the retractable paddle 1 is switched from the stop mode to the working mode, the upper paddle hub and the lower paddle hub rotate 90 degrees, so that the second locking groove 1134a of the first stopping part 1134 is matched with (or plugged into) the second protrusion 1224a of the second stopping part 1224. Thus, by mating the second protrusion 1224a with the second locking groove 1134a, the connection and the position limitation are performed, and the axial pulling force generated by the lower blade assembly 12 is borne.
In particular, as shown in fig. 9 and 10, the circumferential spacing of first projection 1234a from first detent 1313a and second projection 1224a from second detent 1134a satisfies the following condition: when the first locking groove 1313a of the fourth stopper 1313 of the upper shaft 131 is rotated in one direction toward the first protrusion 1234a of the third stopper 1234 of the lower paddle hub 123, the second locking groove 1134a of the first stopper 1134 of the lower paddle hub 113 can be rotated in the same direction toward the second protrusion 1224a of the second stopper 1224 of the upper paddle hub 122, thereby ensuring that the rotation requirement is satisfied.
Hereinafter, a procedure of using the opening/closing paddle of the present application will be described.
When the opening and closing paddle 1 is switched from the stop mode to the operating mode, the drive shaft assembly 13 is rotated by 90 degrees in a clockwise direction (for example, upward in fig. 9 and 10) with respect to the lower paddle assembly 12 together with the upper paddle assembly 11 fixedly connected to the drive shaft assembly 13 against the torsion force of the torsion spring 133. At this time, the second locking groove 1134a of the first stopping portion 1134 of the upper-paddle lower hub 113 is matched with the second protrusion 1224a of the second stopping portion 1224 of the lower-paddle upper hub 122, and the first locking groove 1313a of the fourth stopping portion 1313 of the upper-paddle shaft 131 is matched with the second protrusion 1234a of the third stopping portion 1234 of the lower-paddle lower hub 123, so as to rotate the lower-paddle assembly 12 together. In the working mode, the upper blade assembly 11 and the lower blade assembly 12 are crossed with the transmission shaft assembly 13 as the center.
When the opening and closing paddle 1 is switched from the operating mode to the stop mode, the motor 3 is stopped, the transmission shaft assembly 13 stops rotating, and the lower paddle assembly 12 rotates in a clockwise direction (for example, upward in fig. 9 and 10) to a position parallel to the upper paddle assembly 11 under the torsional force of the torsion spring. In the stop mode, the upper blade assembly 11 and the lower blade assembly 12 are in a straight shape.
Hereinafter, some advantageous effects of the opening and closing paddle according to the present application will be described.
1. Less parts and low cost
The whole opening and closing paddle structure only comprises the paddles, the paddle hub, the fasteners, the bearings and the torsion springs, the number of parts is small, and the processing cost is low.
2. Full mechanical structure and high reliability
The transmission shaft assembly 13 and the upper paddle assembly 11 drive the lower paddle assembly 12 to rotate, so that the lower paddle assembly 12 achieves an opening function under the action of inertia force, and meanwhile, when the transmission shaft assembly 13 and the upper paddle assembly 11 stop rotating, a return function is achieved under the action of torsion force of a torsion spring, and the mechanical structure is adopted, and the electric control structure is not used for controlling, so that the safety and the reliability are realized.
3. Detachable structure and good maintainability
All structures are all detachable, when needing to be maintained, the fastening piece is detached, the internal structure can be reached, and visual inspection and maintenance are facilitated.
4. Good interchangeability
When any part is damaged, a new part can be used for replacing the damaged part, the whole opening and closing paddle structure is not used for scrapping, the interchangeability is good, and the cost is low.
It is to be understood that, in the present application, when the number of the parts or members is not particularly limited, the number thereof may be one or more, and the plurality herein means two or more. Where the number of parts or elements shown in the drawings and/or described in the specification is a specific number, e.g., two, three, four, etc., that is generally exemplary and not limiting, it can be understood that there are a plurality, i.e., two or more.
It should be understood that the above embodiments are merely exemplary, and are not intended to limit the present application. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of this application without departing from the scope thereof.
(i) For example, although in the present embodiment, in the operation mode, the upper paddle assembly and the lower paddle assembly have a cross structure, the present invention is not limited thereto. The cross structure can reduce the rotating speed of the blade tip to the maximum extent, and the cross structure can be not a cross structure, so long as the upper blade assembly and the lower blade assembly are crossed.
(ii) For example, although the upper paddle assembly is fixedly connected to the transmission shaft assembly and the lower paddle assembly is rotatable around the transmission shaft assembly in the present embodiment, the present invention is not limited thereto. Or the upper paddle assembly can rotate around the transmission shaft assembly, and the lower paddle assembly is fixedly connected with the transmission shaft assembly.
(iii) For example, in the present embodiment, the rotation of the lower paddle assembly is completed by a mechanical structure such as a torsion spring, but the present invention is not limited thereto. The torsion spring may also be replaced with an elastic member or structure having a return function including a coil spring or the like. In addition, the lower paddle assembly may be rotated using a control device such as a steering engine.
Claims (12)
1. An opening and closing paddle (1) is characterized by comprising an upper paddle assembly (11), a lower paddle assembly (12) and a transmission shaft assembly (13), wherein the upper paddle assembly (11) and the lower paddle assembly (12) are coaxially connected to the transmission shaft assembly (13), one of the upper paddle assembly (11) and the lower paddle assembly (12) is fixedly connected to the transmission shaft assembly (13), and the other can rotate around the transmission shaft assembly (13) relative to the one in a plane, so that the upper paddle assembly (11) and the lower paddle assembly (12) can be switched between a state of being parallel to each other and a state of being intersected with each other.
2. The paddle of claim 1,
the opening and closing paddle (1) has a stop mode in which the upper paddle assembly (11) and the lower paddle assembly (12) are parallel to each other and a working mode in which the upper paddle assembly (11) and the lower paddle assembly (12) intersect with each other.
3. The paddle of claim 1,
the transmission shaft assembly (13) comprises a transmission shaft (131) and an elastic member for generating torsion, the transmission shaft (131) is fixedly connected with one of the upper paddle assembly (11) and the lower paddle assembly (12), and the elastic member connects the transmission shaft (131) with the other of the upper paddle assembly (11) and the lower paddle assembly (12).
4. The opening and closure paddle of claim 3,
the elastic component comprises or is a torsion spring (133), when the opening and closing paddle (1) is switched from a stop mode to a working mode, the transmission shaft (131) overcomes the torsion force generated by the torsion spring (133) and rotates relative to the other one of the upper paddle assembly (11) and the lower paddle assembly (12) to drive the other one of the upper paddle assembly (11) and the lower paddle assembly (12) to rotate together,
when the opening/closing paddle (1) is switched from the operating mode to the stop mode, the transmission shaft (131) stops rotating, and the other of the upper paddle assembly (11) and the lower paddle assembly (12) rotates to a position parallel to the one of the upper paddle assembly (11) and the lower paddle assembly (12) by the torsion force of the torsion spring (133).
5. The opening and closure paddle according to any of claims 1 to 4,
go up oar assembly (11) fixed connection in transmission shaft assembly (13), oar assembly (12) can encircle down transmission shaft assembly (13) is rotatory.
6. The opening and closure paddle according to any of claims 1 to 4,
the lower side of the upper blade assembly (11) has a first stopper portion (1134), the upper side of the lower blade assembly (12) has a second stopper portion (1224) opposite to the first stopper portion (1134) in the circumferential direction of the propeller shaft assembly (13),
the opening/closing paddle (1) is switched between an operating mode and a stop mode by abutting the first stopper portion (1134) against the second stopper portion (1224) on both sides in the circumferential direction.
7. The opening and closure paddle of claim 5,
the lower side of the lower paddle assembly (12) has a third stopper portion (1234), the propeller shaft assembly (13) has a fourth stopper portion (1313) opposite to the third stopper portion (1234) in the circumferential direction of the propeller shaft assembly (13),
the opening/closing paddle (1) is switched between an operating mode and a stop mode by abutting the third stopper (1234) against the fourth stopper (1313) on both sides in the circumferential direction.
8. The opening and closure paddle of claim 6,
when the first stopper (1134) and the second stopper (1224) abut in the circumferential direction, the first stopper (1134) and the second stopper (1224) are relatively fixed in the axial direction of the propeller shaft assembly (13).
9. The opening and closure paddle of claim 7,
when the third stopper (1234) and the fourth stopper (1313) abut in the circumferential direction, the third stopper (1234) and the fourth stopper (1313) are relatively fixed in the axial direction of the propeller shaft assembly (13).
10. The opening and closing paddle according to claim 2,
in the working mode, the upper paddle assembly (11) is at 90 degrees to the lower paddle assembly (12).
11. The opening and closure paddle according to any of claims 1 to 4,
the upper blade assembly (11) comprises two upper blades (111), an upper blade hub (112), a lower upper blade hub (113) and a fastening member (114), the fastening member (114) fastens the upper blade hub (112) and the lower upper blade hub (113) together, the root portions of the two upper blades (111) are held between the upper blade hub (112) and the lower upper blade hub (113) and/or
The lower blade assembly (12) comprises two lower blades (121), a lower blade upper hub (122), a lower blade lower hub (123) and a fastener (124), the fastener (124) fastening the lower blade upper hub (122) and the lower blade lower hub (123) together, the roots of the two lower blades (121) being held between the lower blade upper hub (122) and the lower blade lower hub (123).
12. An electric VTOL aerial vehicle, comprising:
an opening and closing paddle (1) according to any of claims 1 to 10;
a body (2); and
and the motor (3) is connected with the opening and closing paddle (1) and is used for driving the opening and closing paddle (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210152915.9A CN114476026A (en) | 2022-02-18 | 2022-02-18 | Opening and closing paddle and electric vertical take-off and landing aircraft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210152915.9A CN114476026A (en) | 2022-02-18 | 2022-02-18 | Opening and closing paddle and electric vertical take-off and landing aircraft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114476026A true CN114476026A (en) | 2022-05-13 |
Family
ID=81482196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210152915.9A Pending CN114476026A (en) | 2022-02-18 | 2022-02-18 | Opening and closing paddle and electric vertical take-off and landing aircraft |
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| Country | Link |
|---|---|
| CN (1) | CN114476026A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115723943A (en) * | 2022-12-29 | 2023-03-03 | 重庆交通大学绿色航空技术研究院 | Double-layer multi-rotor-wing rotary locking device |
-
2022
- 2022-02-18 CN CN202210152915.9A patent/CN114476026A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115723943A (en) * | 2022-12-29 | 2023-03-03 | 重庆交通大学绿色航空技术研究院 | Double-layer multi-rotor-wing rotary locking device |
| CN115723943B (en) * | 2022-12-29 | 2023-09-19 | 重庆交通大学绿色航空技术研究院 | Double-deck many rotors rotatory locking device |
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