CN219821748U - Variable pitch propeller hub structure - Google Patents
Variable pitch propeller hub structure Download PDFInfo
- Publication number
- CN219821748U CN219821748U CN202321296756.6U CN202321296756U CN219821748U CN 219821748 U CN219821748 U CN 219821748U CN 202321296756 U CN202321296756 U CN 202321296756U CN 219821748 U CN219821748 U CN 219821748U
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- pitch
- hub
- oar
- variable
- paddle
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- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000033001 locomotion Effects 0.000 description 12
- 230000007547 defect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Abstract
The utility model discloses a variable-pitch propeller hub structure, which comprises an upper propeller hub, a lower propeller hub, a propeller hub connecting bolt group, a propeller clamp blade pitch-changing assembly, a rotating shaft and a lockbolt group, wherein rotating grooves are formed in the upper propeller hub and the lower propeller hub; according to the utility model, the parts such as the variable-pitch shaft, the thrust bearing, the deep groove ball bearing and the like are arranged in the upper hub and the lower hub, so that the radial size of the whole mechanism is reduced, the number of parts is reduced, the structure is simple, and the maintenance is simple.
Description
Technical Field
The utility model relates to the technical field of unmanned aerial vehicles, in particular to a variable-pitch propeller hub structure.
Background
A rotor system of a conventional helicopter consists of a plurality of blades and a hub. When the rotor system rotates, the blades, in addition to rotating about the rotor shaft, have pitch, flapping and lag motions. The rotor form is determined by the hub form. Hub forms may include fully hinged, semi-hinged, hingeless, bearingless, and the like. Wherein the pitch hinge functions to change the pitch of the rotor as the rotor blades are maneuvered about the axial hinge, thereby changing the rotor drag. The conventional full-hinged hub comprises a variable-pitch hinge, a flap hinge and a shimmy hinge; the semi-hinged hub is formed by removing a shimmy hinge or connecting with a blade through a universal hinge; the hingeless hub only retains the pitch hinges; the bearing-free hub eliminates a pitch-changing hinge, a flap hinge and a shimmy hinge, and the flap, shimmy and pitch-changing movements of the blade are all completed by flexible elements at the root of the blade. The hub and the blade clamp are used as main bearing components of the rotor, and are connected with the blades and the propeller main shaft, so that the propeller main shaft drives the blades to rotate, and lift force is transmitted to the rotor shaft by the blades.
Conventional full-hinged hubs are common and are also commonly used in helicopters. A proprotor, a tiltrotor, etc. The paddle hub in the form needs more metal bearings to assemble, has more hinge structures, complex structures and larger weight. Therefore, this type is not suitable for a small unmanned aerial vehicle having a certain limit on weight. The full-hinged hub has the defects of complex structure, large maintenance workload, low fatigue life and the like, and is high in maintenance cost, so that the economy of the small unmanned aerial vehicle is not facilitated.
In the prior art, the root of the blade of the variable-pitch blade is generally designed into a cylinder shape, and the bearing is arranged on the outer surface of the blade, so that the rotation of the blade around the variable-pitch shaft can be ensured, and the variable-pitch motion can be further completed. In the full-hinged hub, the variable-pitch blade needs more connecting parts to be connected with the hub, and the structure is complex. Is not suitable for unmanned aerial vehicles which only require variable-pitch motions.
Disclosure of Invention
The utility model aims to solve the technical problems in the prior art and provides a variable-pitch propeller hub structure.
In order to achieve the above purpose, the technical scheme provided by the utility model is as follows: the utility model provides a but pitch-variable screw propeller hub structure, includes oar hub, lower oar hub, oar hub connecting bolt group, oar presss from both sides paddle pitch-variable subassembly, rotation axis and lockbolt group, go up the oar hub and pass through oar hub connecting bolt group with be connected down the oar hub, go up the oar hub, be provided with the rotary slot in the oar hub down, oar presss from both sides the paddle pitch-variable subassembly and includes pitch-variable axle, thrust bearing, deep groove ball bearing, oar presss from both sides, paddle and paddle connecting bolt group, the pitch-variable axle is the step axle, the spindle nose of pitch-variable axle is installed on the rotary slot, the shaft body of pitch-variable axle with thrust bearing, deep groove ball bearing's outer lane is installed on the inner wall of going up oar hub, lower oar hub, the paddle passes through the paddle connecting bolt group is installed on the oar presss from both sides, the oar presss from both sides through interior hexagonal flat head screw with pitch-variable axle fixed connection.
Preferably, balls are arranged between the inner ring and the outer ring of the deep groove ball bearing, the inner ring of the deep groove ball bearing and the variable-pitch shaft do not rotate relatively, and the outer ring of the deep groove ball bearing and the inner walls of the upper paddle hub and the lower paddle hub are in interference fit and do not rotate relatively.
Preferably, the variable-pitch shaft, the paddle clamp and the paddle are connected into a whole body capable of rotating around the axis of the variable-pitch shaft together through bolts.
Preferably, a gap is left between the root of the blade and the blade clamp in the axial direction along the blade connecting bolt group.
Preferably, the lockbolt group is cross, the upper end of rotation axis passes through lockbolt group fixed connection is in the sleeve end of oar hub down, main reducer is connected to the bottom of rotation axis.
Preferably, the pitch assembly further comprises a bolted joint provided on the pitch clamp, the bolted joint being mountable with a pitch control lever mountable in a pitch control mechanism.
The utility model has the beneficial effects that:
1. according to the utility model, the shaft heads of the variable-pitch shaft are arranged on the rotary groove, the shaft body of the variable-pitch shaft is connected with the inner rings of the thrust bearing and the deep groove ball bearing, the outer rings of the thrust bearing and the deep groove ball bearing are arranged on the inner walls of the upper propeller hub and the lower propeller hub, and the radial size of the whole mechanism is reduced, the number of parts is reduced, the structure is simple, the maintenance is simple, the structure weight of the existing propeller hub structure is reduced, the defects of complex structure, large weight and the like are overcome, and the variable-pitch shaft is more suitable for a small unmanned aerial vehicle.
2. After the blade is connected with the blade clamp through the blade connecting bolt group, a gap is reserved between the root of the blade and the blade clamp along the axial direction of the blade connecting bolt group, so that the blade can perform shimmy movement and waving movement to a certain extent, and the functional integrity of the structure is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model.
FIG. 1 is an exploded view of the hub structure of the present utility model;
FIG. 2 is a schematic exploded view of the pitch assembly of the present utility model.
The drawings are marked:
1-upper hub, 2-lower hub, 3-hub connecting bolt group, 4-paddle clamp blade pitch changing component, 5-rotating shaft, 6-lockbolt group, 7-pitch changing shaft, 8-thrust bearing, 9-deep groove ball bearing, 10-hexagon flat button head screw, 11-paddle clamp, 12-blade, 13-blade connecting bolt group and 14-bolt joint.
Detailed Description
Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1, a rotor hub structure of a variable pitch propeller according to a preferred embodiment of the present utility model, as shown in fig. 1, the rotor hub structure of the present utility model comprises an upper rotor hub 1, a lower rotor hub 2, a rotor hub connection bolt group 3, a rotor clamp blade pitch changing assembly 4, a rotating shaft 5, and a lockbolt group 6. The upper hub 1 and the lower hub 2 are fixedly connected through the hub bolt group 3, so that the relative displacement between the upper hub 1 and the lower hub 2 is prevented, and the stability and the safety are ensured.
As shown in fig. 2, the pitch assembly 4 comprises a pitch shaft 7, a thrust bearing 8, a deep groove ball bearing 9, a hexagon socket head screw 10, a pitch 11, a blade 12 and a blade connecting bolt group 13.
The paddle 12 is installed on the paddle clamp 11 through the paddle connecting bolt group 13, the paddle clamp 11 is fixedly connected with the variable-pitch shaft 7 through the hexagonal flat round head screw 10, the variable-pitch shaft 7 is in the form of a stepped shaft, the shaft body is provided with an inner ring of the thrust bearing 8 and the deep groove ball bearing 9, the outer rings of the two bearings are installed on the inner walls of the upper paddle hub 1 and the lower paddle hub 2, namely, the paddle clamp paddle assembly is connected with the upper paddle hub 1 and the lower paddle hub 2 through the thrust bearing 8 and the deep groove ball bearing 9, and the shaft head of the variable-pitch shaft 7 is installed in corresponding rotating grooves in the upper paddle hub 1 and the lower paddle hub 2 so as to prevent the axial movement of the variable-pitch shaft 7. The pitch-changing shaft 7, the blade clamp 11 and the blade 12 are connected through bolts to form a whole which can rotate around the pitch-changing shaft 7. After the blade 12 is connected with the blade clamp 11 through the blade connecting bolt group 13, a gap is reserved between the root of the blade 12 and the blade clamp 11 along the axial direction of the blade connecting bolt group 13, so that the blade 12 can perform swing and waving movements to a certain extent.
The inner ring of the deep groove ball bearing 9 and the pitch-changing shaft 7 do not rotate relatively, the outer ring is in interference fit with the inner wall of the upper and lower paddle hubs 2, balls are arranged between the inner ring and the outer ring of the deep groove ball bearing 9, the inner ring and the outer ring can rotate relatively, and the pitch-changing movement of the paddles 12 can be ensured.
The lockbolt group 6 is the cross, and the sleeve end of rotor hub 2 is down passed through lockbolt group 6 fixed connection to the upper end of rotation axis 5, and the bolt group that main reducer "cross" was arranged is connected to the bottom of rotation axis 5 under the prerequisite of guaranteeing bolted connection intensity, shearing strength, reducible lockbolt group 6 and the interference of paddle connecting bolt group 13 to and avoided punching at rotation axis 5 same direction and then can guarantee rotation axis 5's intensity, and can reduce the height of whole mechanism, reduce mechanism weight.
When the motor provides power for the rotating shaft 5 through the main speed reducer, the rotating shaft 5 rotates around the axis to drive the upper hub 1 and the lower hub 2 to integrally rotate. And further drives the pitch varying assembly 4 to rotate to realize the rotation of the blade 12 around the axis of the rotating shaft 5.
The pitch assembly 4 of the blade clamp further comprises a bolt joint 14, the bolt joint 14 is arranged on the blade clamp 11, the bolt joint 14 can be provided with a pitch-changing pull rod, the other end of the pitch-changing pull rod can be arranged in a pitch-changing mechanism, the pitch-changing pull rod moves up and down, the bolt joint 14 can be driven to rotate, and the pitch-changing part of the blade clamp 12 can be driven to move around the pitch-changing shaft 7 in a linear mode, namely, pitch-changing motion.
The distance-changing mechanism and the distance-changing pull rod in the utility model are all components known by the person skilled in the art, and the structure and principle thereof are known by the person skilled in the art through technical manuals or by routine experimental methods, and are the prior art, so the details are not described.
According to the utility model, the shaft heads of the variable-pitch shaft 7 are arranged on the rotary groove, the shaft body of the variable-pitch shaft 7 is connected with the thrust bearing 8 and the inner ring of the deep groove ball bearing 9, the outer rings of the thrust bearing 8 and the deep groove ball bearing 9 are arranged on the inner walls of the upper propeller hub 1 and the lower propeller hub 2, and the radial size of the whole mechanism is reduced by arranging the variable-pitch shaft 7, the thrust bearing 8, the deep groove ball bearing 9 and other parts inside the upper propeller hub 1 and the lower propeller hub 2, so that the number of parts is reduced, the structure is simple, the maintenance is simple, the structure weight is reduced, the defects of complex structure, large weight and the like of the existing propeller hub structure are overcome, and the variable-pitch shaft is suitable for a small unmanned aerial vehicle.
In the utility model, after the blade 12 is connected with the blade clamp 11 through the blade connecting bolt group 13, a gap is reserved between the root of the blade 12 and the blade clamp 11 along the axial direction of the blade connecting bolt group 13, so that the blade 12 can perform shimmy movement and waving movement to a certain extent, and the functional integrity of the utility model is ensured.
The above additional technical features can be freely combined and superimposed by a person skilled in the art without conflict.
The foregoing is only a preferred embodiment of the present utility model, and all technical solutions for achieving the object of the present utility model by substantially the same means are within the scope of the present utility model.
Claims (6)
1. A variable pitch propeller hub structure, characterized in that: including last oar hub (1), lower oar hub (2), oar hub connecting bolt group (3), oar presss from both sides paddle pitch assembly (4), rotation axis (5) and lockbolt group (6), go up oar hub (1) through oar hub connecting bolt group (3) with be connected down oar hub (2), it is provided with the rotary groove in oar hub (1), lower oar hub (2) to go up, oar presss from both sides paddle pitch assembly (4) including pitch-changing axle (7), thrust bearing (8), deep groove ball bearing (9), oar presss from both sides (11), paddle (12) and paddle connecting bolt group (13), pitch-changing axle (7) are the step shaft, the spindle nose of pitch-changing axle (7) is installed on the rotary groove, the shaft body of pitch-changing axle (7) with the inner circle of thrust bearing (8), deep groove ball bearing (9) is connected, install on the inner wall of going up oar hub (1), lower oar hub (2), paddle (12) pass through pitch-changing axle (11) and install pitch-changing screw (11) and pitch-changing screw (11) are pressed from both sides.
2. A variable pitch propeller hub structure according to claim 1, wherein: the inner ring of the deep groove ball bearing (9) and the variable-pitch shaft (7) do not rotate relatively, and the outer ring of the deep groove ball bearing (9) and the inner walls of the upper propeller hub (1) and the lower propeller hub (2) are in interference fit and do not rotate relatively.
3. A variable pitch propeller hub structure according to claim 1, wherein: the variable-pitch shaft (7), the paddle clamp (11) and the paddle (12) are connected through bolts to form a whole which can rotate around the axis of the variable-pitch shaft (7) together.
4. A variable pitch propeller hub structure according to claim 1, wherein: a gap is reserved between the root of the blade (12) and the blade clamp (11) along the axis direction of the blade connecting bolt group (13).
5. A variable pitch propeller hub structure according to claim 1, wherein: the anti-loose bolt set (6) is cross-shaped, the upper end of the rotating shaft (5) is fixedly connected with the sleeve end of the lower propeller hub (2) through the anti-loose bolt set (6), and the bottom end of the rotating shaft (5) is connected with the main speed reducer.
6. A variable pitch propeller hub structure according to claim 1, wherein: the pitch assembly (4) of the blade clamp further comprises a bolt joint (14), the bolt joint (14) is arranged on the blade clamp (11), the bolt joint (14) can be provided with a pitch change pull rod, and the pitch change pull rod can be arranged in a pitch change mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321296756.6U CN219821748U (en) | 2023-05-26 | 2023-05-26 | Variable pitch propeller hub structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321296756.6U CN219821748U (en) | 2023-05-26 | 2023-05-26 | Variable pitch propeller hub structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219821748U true CN219821748U (en) | 2023-10-13 |
Family
ID=88248526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321296756.6U Active CN219821748U (en) | 2023-05-26 | 2023-05-26 | Variable pitch propeller hub structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219821748U (en) |
-
2023
- 2023-05-26 CN CN202321296756.6U patent/CN219821748U/en active Active
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