Electric propulsion rotor system with variable pitch of internal control rotor

Abstract

The invention belongs to the field of overall design of propeller hub structures, and particularly relates to an electric propulsion rotor system with variable pitch of an internal control rotor. Comprising blades (1), variable pitch steering engines (2), direct drive motors (3), propeller hubs (4) and steering engine connecting bolts (5), the propeller hubs (4), the direct drive motors (3) and the variable pitch steering engines (2) are arranged from top to bottom, and propeller shells of the propeller hubs (4) are directly fixed to driving shafts of the direct drive motors (3); a control mechanism of the propeller hub (4) is directly connected with the variable-pitch steering engine (2) through a steering engine connecting bolt (5), the control mechanism of the propeller hub (4) comprises a control rod and a variable-pitch shifting sleeve, and the variable-pitch shifting sleeve is arranged on the control rod in a sleeving mode and is pressed and fixed through a shifting sleeve fixing nut; the paddle (1) is connected with the variable-pitch shifting sleeve through a rocker arm, the variable-pitch steering engine (2) moves up and down to drive the control mechanism to move up and down linearly, the vertical linear motion is further converted into variable-pitch motion of the paddle (1), and a shell of the direct drive motor (3) is fixed to a shell of the variable-pitch steering engine (2).

Description

Technical Field

[0001] The invention belongs to the field of overall design of hub configuration of vertical take-off and landing aircraft, and in particular relates to an electric propulsion rotor system with variable pitch of inner control rotor. Background Art

[0002] Electric vertical take-off and landing aircraft (eVTOL) involves the fields of fixed-wing aircraft and helicopters, especially in terms of power. eVTOL omits the complex mechanical structure of traditional helicopters, such as replacing the engine and part of the transmission mechanism with a size-independent motor; using the speed difference to provide lift instead of the automatic tilt mechanism, etc. Compared with previous helicopters, eVTOL has made great improvements in the rotor system, transmission system, power system, lubricating oil / fuel system, etc., and is a well-deserved new aircraft.

[0003] At present, the industry has different understandings of the positioning, configuration, and purpose of eVTOL, which has also resulted in the lack of a fixed route for the development of this new type of aircraft. At present, direct motor drive and variable motor speed are mostly used. Direct motor drive + variable servo pitch is a typical hub configuration for eVTOL, but this configuration has the following difficulties: 1. The spatial position deployment of the hub, motor, and servo. 2. The connection method between the hub and the motor, and the connection method between the motor and the variable pitch mechanism. Summary of the invention

[0004] Purpose of the invention: To provide an electric propulsion rotor system with a compact layout and reliable connection and an inner control rotor with variable pitch.

[0005] Technical solution:

[0006] An electric propulsion rotor system with variable pitch of an inner-controlled rotor comprises: a blade 1, a variable pitch steering gear 2, a direct drive motor 3, a propeller hub 4, and a steering gear connecting bolt 5.

[0007] Among them, the hub 4, the direct-drive motor 3, and the variable-pitch servo 2 are arranged from top to bottom, and the propeller shell of the hub 4 is directly fixed to the driving shaft of the direct-drive motor 3; the operating mechanism of the hub 4 is directly connected to the variable-pitch servo 2 through the servo connecting bolt 5, and the operating mechanism of the hub 4 includes: a joystick and a variable-pitch shift sleeve, which is sleeved on the joystick and fixed by a shift sleeve fixing nut; the blade 1 is connected to the variable-pitch shift sleeve through a rocker arm, and the up and down movement of the variable-pitch servo 2 drives the operating mechanism to move up and down in a straight line, which is further converted into the variable-pitch movement of the blade 1, and the housing of the direct-drive motor 3 is fixed to the housing of the variable-pitch servo 2.

[0008] Furthermore, the driving shaft of the direct drive motor 3 is connected to the housing of the hub 4 via the hub motor connecting bolts 8 and the hub special-shaped nuts 6 .

[0009] Furthermore, the operating mechanism of the hub 4 passes through the direct drive motor 3 and is connected to the output shaft of the variable pitch steering gear 2 via the steering gear connecting bolts 5 .

[0010] Furthermore, it also includes a positioning key 9, wherein the positioning key 9 is interference fit with the lower shell of the hub 4 and the driving shaft of the direct drive motor 3.

[0011] Furthermore, the hub special-shaped nut 6 includes at least two nuts and the nuts are connected in sequence.

[0012] Furthermore, the propeller shell is divided into an upper propeller shell and a lower propeller shell, and is connected by propeller shell connecting bolts 7.

[0013] Furthermore, the housing of the direct drive motor 3 and the housing of the variable pitch steering gear 2 are fixed by bolts.

[0014] Furthermore, a cross groove is provided at the upper end of the joystick, which is used to fix the joystick when tightening the sleeve fixing nut.

[0015] Beneficial effects:

[0016] For the first time, based on the overall needs of distributed propulsion electric vertical take-off and landing aircraft, the electric propulsion system configuration design of the variable-pitch inner control rotor was completed. By designing the variable-pitch configuration of the rotor hub and the implementation method of the motor-driven hub, the inner control rotor, drive motor, and variable-pitch servo were arranged and integrated. This electric propulsion system not only meets the needs of variable-pitch rotors, but also has an extremely compact structure and the lightest weight. An electric propulsion system with variable pitch inner control rotors can provide a reference for the subsequent overall configuration design of eVTOL, and is an economical, feasible, and reliable solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an axonometric diagram of an electric propulsion rotor system with variable pitch of an inner control rotor according to an embodiment of the present invention;

[0018] Figure 2 It is a front view of an electric propulsion rotor system with variable pitch of an inner control rotor according to an embodiment of the present invention;

[0019] Figure 3 It is a schematic diagram of the connection relationship between the lower shell of the propeller hub and the drive shaft of the direct drive motor, and the connection relationship between the control structure of the propeller hub and the steering gear drive shaft.

[0020] Among them, it includes blades 1, variable pitch servo 2, direct drive motor 3, hub 4, servo connecting bolts 5, hub special-shaped nuts 6, hub connecting bolts 7, hub motor connecting bolts 8, and positioning keys 9. DETAILED DESCRIPTION

[0021] like Figure 1-3, an electric propulsion system with an internally controlled rotor and variable pitch, comprising a blade 1, a variable pitch servo 2, a direct drive motor 3, a hub 4, a servo connecting bolt 5, a hub special-shaped nut 6, a hub connecting bolt 7, a hub motor connecting bolt 8, and a positioning key 9.

[0022] The hub 4, direct drive motor 3 and variable pitch servo 2 are arranged from top to bottom. The housing of the hub 4 is directly fixed to the drive shaft of the direct drive motor 3, and the direct drive motor 3 directly drives the hub 4 to rotate; the control mechanism of the hub 4 is directly connected to the variable pitch servo 2 through the variable pitch servo 2 connecting bolt 5, and the variable pitch servo 2 moves up and down to drive the control mechanism to move linearly, which is further converted into the variable pitch movement of the blade 1. The drive shaft of the direct drive motor 3 is connected to the housing of the hub 4 through the hub motor connecting bolt 8 and the hub special nut 6. The hub 4 is divided into an upper propeller shell and a lower propeller shell, which are connected by the propeller shell connecting bolt 7.

[0023] When installing the direct-drive motor 3, the upper and lower propeller shells are opened, and the hub motor connecting bolt 8 passes through the lower propeller shell and is connected to the hub special-shaped nut 6. Due to the limited space of the direct-drive motor 3, the nut cannot be fixed and tightened with a tooling. The design of the two hub special-shaped nuts 6 solves this problem. The two / three bolt holes of the hub special-shaped nut 6 constrain each other to ensure that the nut does not rotate relative to the bolt. The hub 4 is connected to the variable pitch servo 2 through the servo connecting bolt 5. After the operating mechanism is installed, the fixed position of the servo connecting bolt 5 can move downward with the operating mechanism, ensuring the installation space. After the installation between the hub 4 and the variable pitch servo 2 is completed, the variable pitch servo 2 and the direct-drive motor 3 are fixed, and then the variable pitch servo 2 is zeroed and other operations are performed.

[0024] The use of special-shaped nuts solves the problem that the tooling cannot be used to fix the nuts when tightening, and realizes direct fixation of the propeller hub and the direct drive motor 3. The direct drive motor 3 is directly connected to the propeller hub 4, and the variable pitch servo 2 is directly connected to the direct drive motor 3 without a switching structure.

[0025] During the disassembly process,

[0026] 1. Disassembly of the variable pitch servo 2: The propeller hub control mechanism includes an inner control structure and an outer control mechanism, and the inner / outer control mechanisms can be disassembled separately. When disassembling the variable pitch servo 2, the direct drive motor 3 and the propeller hub 4, first remove the connecting bolts of the pitch shifting sleeve joystick, and the joystick can be directly separated from the propeller hub, so that the disassembly of the propeller hub 4, the direct drive motor 3 and the variable pitch servo 2 can be completed.

[0027] 2. Disassembly of the direct drive motor 3: First remove the propeller hub connecting bolt 7, open the propeller shell and then remove the control assembly, then remove the propeller hub motor connecting bolt 8 on the lower propeller shell to complete the disassembly of the propeller hub 4 and the direct drive motor 3.

Claims

1. An electric propulsion rotor system with variable pitch inner control rotor, characterized in that: include: propeller blade (1), variable pitch steering gear (2), direct drive motor (3), propeller hub (4), steering gear connecting bolt (5), The propeller hub (4), the direct drive motor (3) and the variable pitch steering gear (2) are arranged from top to bottom, and the propeller shell of the propeller hub (4) is directly fixed to the drive shaft of the direct drive motor (3); the control mechanism of the propeller hub (4) is directly connected to the variable pitch steering gear (2) through the steering gear connecting bolt (5), and the control mechanism of the propeller hub (4) comprises: a control rod and a variable pitch shifting sleeve, and the variable pitch shifting sleeve is sleeved on the control rod and is pressed and fixed by a sleeve fixing nut; the propeller blade (1) and the variable pitch shifting sleeve are connected through a rocker arm, and the up and down movement of the variable pitch steering gear (2) drives the control mechanism to move up and down linearly, which is further converted into the variable pitch movement of the propeller blade (1), and the housing of the direct drive motor (3) is fixed to the housing of the variable pitch steering gear (2).

2. The electric propulsion rotor system with variable pitch inner control rotor according to claim 1, characterized in that: The driving shaft of the direct-drive motor (3) is connected to the housing of the propeller hub (4) via propeller hub motor connecting bolts (8) and propeller hub special-shaped nuts (6).

3. The electric propulsion rotor system with variable pitch inner control rotor according to claim 1, characterized in that: The operating mechanism of the propeller hub (4) passes through the direct drive motor (3) and is connected to the output shaft of the variable pitch steering gear (2) via a steering gear connecting bolt (5).

4. The electric propulsion rotor system with variable pitch inner control rotor according to claim 1, characterized in that: It also includes a positioning key (9), wherein the positioning key (9) is interference-fitted with the lower shell of the hub (4) and the drive shaft of the direct-drive motor (3).

5. The electric propulsion rotor system with variable pitch inner control rotor according to claim 2, characterized in that: The propeller hub special-shaped nut (6) comprises at least two nuts and the nuts are connected in sequence.

6. The electric propulsion rotor system with variable pitch inner control rotor according to claim 1, characterized in that: The propeller shell is divided into an upper propeller shell and a lower propeller shell, which are connected by propeller shell connecting bolts (7).

7. The electric propulsion rotor system with variable pitch inner control rotor according to claim 1, characterized in that: The housing of the direct drive motor (3) and the housing of the variable pitch steering gear (2) are fixed by bolts.

8. The electric propulsion rotor system with variable pitch inner control rotor according to claim 1, characterized in that: A cross groove is arranged on the upper end of the operating rod, which is used to fix the operating rod when tightening the fixing nut of the dial sleeve.

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