A hub structure of a thrust paddle

Abstract

The present invention discloses a hub structure of a thrust propeller, which includes: a propeller housing, a plurality of cuffs for installing blade assemblies are provided around the propeller housing, and sliding holes are respectively formed in the middle parts of both ends of the propeller housing; a pitch-changing rod, one end of the pitch-changing rod is slidably connected in the sliding hole, and the other end is connected to the control shaft of the aircraft to drive its axial movement; a shifting sleeve, the shifting sleeve is fixed on the pitch-changing rod and is located in the inner cavity of the propeller housing and axially moves along with the pitch-changing rod, and a plurality of shifting grooves are annularly provided around the shifting sleeve; a blade root connecting disc, the blade root connecting disc is rotatably connected in the cuff, one end of the blade root connecting disc is fixedly connected with a blade on the outside of the propeller housing and drives the blade to change its angle, and an eccentric pin is fixedly connected to the edge of the other end, and the eccentric pin is adapted to be clamped in the shifting groove and drive the blade to change its angle along with the axial movement of the pitch-changing rod. The present invention changes the pitch-changing mode of the blades of the thrust propeller and improves the flight performance of the helicopter.

Description

Technical Field

[0001] The present invention relates to a thrust propeller, and more particularly to a hub structure of a thrust propeller. Background Art

[0002] High-speed helicopters are a new type of combat force that enhances the combat effectiveness of future army aviation forces. The tail thrust propeller provides most of the power for the forward movement of high-speed helicopters and is one of the most critical components of high-speed helicopters. Its structural form, function, and performance are the main factors determining the overall function and performance of high-speed helicopters. As a new type of thrust propeller, in the face of a new servo pitch-changing method, it is necessary to design a new hub structure for the thrust propeller, which can reduce the overall weight of the thrust propeller while meeting the strength requirements and also meet the overall design requirements of the thrust propeller. The present invention aims to design a new hub structure and a new pitch-changing method for a thrust propeller, and introduce a new type of thrust propeller.

[0003] Therefore, how to provide a new hub structure and a new pitch-changing method for a thrust propeller to improve the performance of high-speed helicopters is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a hub structure of a thrust propeller, which reduces the overall weight of the thrust propeller on the premise of meeting the strength requirements and improves the performance of high-speed helicopters with a new pitch-changing method.

[0005] To achieve the above object, the present invention adopts the following technical solution: A hub structure of a thrust propeller, which includes:

[0006] A propeller housing, around which a plurality of cuffs for installing blade assemblies are provided, and sliding holes are respectively opened in the middle parts of both ends of the propeller housing;

[0007] A pitch-changing rod, one end of which is slidably connected in the sliding hole, and the other end is connected to the control shaft of the aircraft to drive its axial movement;

[0008] A shifting sleeve, which is fixed on the pitch-changing rod and is located in the inner cavity of the propeller housing and axially moves along with the pitch-changing rod, and a plurality of shifting grooves are annularly provided around the shifting sleeve;

[0009] A blade root connection disk, which is rotatably connected in the cuff, one end of the blade root connection disk is fixedly connected with a blade outside the propeller housing, the blade root connection disk rotates synchronously with the blade, an eccentric pin is fixedly connected to the edge of the other end of the blade root connection disk, and the eccentric pin is adapted to be clamped in the shifting groove and drives the blade root connection disk to rotate along with the axial movement of the pitch-changing rod.

[0010] The beneficial effects of the present invention are as follows: A cuff for connecting the blade assembly is provided on the paddle housing. The blade can be rotatably connected within the cuff. A pitch-changing rod is slidably connected to the paddle housing. A shifting sleeve is fixedly connected to the pitch-changing rod, and the shifting sleeve is located within the inner cavity of the paddle housing and moves along with the axial movement of the pitch-changing rod. The shifting sleeve is connected to the blade root connection disk through an eccentric pin. While the shifting sleeve moves axially, the eccentric pin moves, causing the blade root connection disk to rotate by a certain angle, thereby changing the blade angle of the blade and changing the thrust value of the helicopter. The blade angle of the thrust paddle is changed through the axial movement of the pitch-changing rod to adapt to high-speed flight under different conditions.

[0011] Preferably, the shifting sleeve includes a shaft tube and a shifting disk. The shifting disk is integrally formed in the middle of the outer side of the shaft tube. The shifting groove is annularly provided on the outer peripheral side of the shifting disk. A limiting block for limiting one end of the shaft tube is provided on the pitch-changing rod. The shaft tube is adaptively sleeved on the pitch-changing rod, and one end of it abuts against the limiting block. A threaded portion is provided at the edge of the other end of the pitch-changing rod, and a limiting nut is connected to the threaded portion. The limiting nut abuts against the other end of the shaft tube.

[0012] Preferably, the shaft tube is slidably connected within the sliding hole. The inner side wall of the sliding hole is annularly provided with a sliding copper sleeve and a spiral retaining ring for limiting the sliding copper sleeve. The sliding copper sleeve is slidably connected to the outer side wall of the shaft tube.

[0013] Preferably, a thread is provided at the edge of one end of the shaft tube corresponding to the threaded portion, and a clamping nut is connected to the thread. The clamping nut can abut against the paddle housing and is used to limit the axial movement stroke of the pitch-changing rod.

[0014] Preferably, a paddle cap mounting disk is fixedly connected to one end of the paddle housing. A paddle cap is fixedly connected to the paddle cap mounting disk. The paddle cap covers the outer peripheral side of the paddle housing.

[0015] Preferably, an annular groove for rotatably connecting the blade root connection disk is provided on the inner side wall of the cuff. The blade root connection disk is circumferentially rotatably connected within the annular groove.

[0016] Preferably, a counterweight for balancing the blade is fixedly connected to the outer side of the paddle housing corresponding to the cuff.

[0017] Preferably, a double-headed stud for connecting the paddle shaft is provided on the paddle housing, and a positioning pin for positioning the installation position of the paddle shaft is provided on the paddle housing. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a hub structure of a thrust paddle of the present invention;

[0019] Figure 2 It is a cross-section of a hub structure of a thrust paddle of the present invention Figure 1 ;

[0020] Figure 3 The cross section of the hub structure of a thrust propeller of the present invention is Figure 2 ;

[0021] Figure 4 A schematic diagram of the hub structure and blade assembly of a thrust propeller of the present invention Figure 1 ;

[0022] Figure 5 A schematic diagram of the hub structure and blade assembly of a thrust propeller of the present invention Figure 2 ;

[0023] Figure 6 It is an enlarged schematic diagram of the hub structure A of a thrust propeller of the present invention.

[0024] 1 propeller shell, 2 cuff, 3 pitch change rod, 4 shift sleeve, 401 shaft tube, 402 dial, 5 propeller root connecting plate, 6 propeller blade, 7 shift slot, 8 limit block, 9 limit nut, 10 positioning nut, 11 sliding copper sleeve, 12 spiral retaining ring, 13 propeller cap mounting plate, 14 propeller cap, 15 eccentric pin, 16 counterweight plate, 17 stud screw, 18 positioning pin, 19 sealing ring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See the attached Figures 1 to 6 According to an embodiment of the present invention, a propeller hub structure of a thrust propeller includes:

[0027] A paddle shell 1, wherein a plurality of cuffs 2 for mounting the paddle blade assembly are arranged around the paddle shell 1, and sliding holes are respectively opened in the middle of both ends of the paddle shell 1;

[0028] A pitch change rod 3, one end of which is slidably connected in the sliding hole, and the other end of which is connected to the control shaft of the aircraft to drive its axial movement;

[0029] The shifting sleeve 4 is fixed on the pitch change rod 3 and is located in the inner cavity of the propeller housing 1 and moves axially along with the pitch change rod 3. The shifting sleeve 4 is surrounded by a shifting groove 7;

[0030] The propeller root connecting plate 5 is rotatably connected to the cuff 2. One end of the propeller root connecting plate 5 is located on the outside of the propeller shell 1 and is fixedly connected to the propeller blade 6 to drive the angle of the propeller blade 6 to change. The edge of the other end is fixedly connected to an eccentric pin 15. The eccentric pin 15 is adapted to be clamped in the toggle slot 7 and drives the angle of the propeller blade 6 to change as the pitch change rod 3 moves axially.

[0031] In other embodiments, the dial sleeve 4 includes a shaft tube 401 and a dial sleeve 402, the dial 402 is integrally formed in the middle of the outer side of the shaft tube 401, and the toggle groove 7 is arranged around the outer peripheral side of the dial 402; the pitch change rod 3 is provided with a limit block 8 for limiting one end of the shaft tube 401, the shaft tube 401 is adapted to be sleeved on the pitch change rod 3 and one end thereof abuts against the limit block 8, and the other end edge of the pitch change rod 3 is provided with a threaded portion, the threaded portion is connected to a limit nut 9, and the limit nut 9 abuts against the other end of the shaft tube 401. The limit nut is used to fix the shaft tube to prevent it from being detached.

[0032] In other embodiments, the shaft tube 401 is slidably connected in the sliding hole, and the inner wall of the sliding hole is provided with a sliding copper sleeve 11 and a spiral retaining ring 12 for limiting the sliding copper sleeve 11, and the sliding copper sleeve 11 is slidably connected to the outer wall of the shaft tube 401. The sliding copper sleeve plays a transitional connection role. The sliding copper sleeve is a thin-walled annular structure, which is used for positioning the sleeve and also plays a wear-resistant role.

[0033] In other specific embodiments, the end edge of the shaft tube 401 corresponding to the threaded portion is provided with a thread, and a retaining nut 10 is connected to the thread, and the retaining nut 10 can abut against the propeller housing 1 and is used to limit the axial movement of the pitch change rod 3. Prevent the axial displacement of the pitch change rod from being too large. Allow the pull sleeve to adjust the blade angle within a reasonable range. Limit the pull of the propeller.

[0034] In some other embodiments, a propeller cap mounting plate 13 is fixedly connected to one end of the propeller housing 1 , a propeller cap 14 is fixedly connected to the propeller cap mounting plate 13 , and the propeller cap 14 is covered on the outer peripheral side of the propeller housing 1 .

[0035] In some other specific embodiments, the inner wall of the cuff 2 is provided with an annular groove for rotatably connecting the blade root connection plate 5, and the blade root connection plate 5 is connected in the annular groove corresponding to the circumferential rotation, so as to facilitate the adjustment of the blade angle and achieve the effect of changing the pitch and changing the thrust.

[0036] In some other specific embodiments, a weight plate 16 for balancing the blades is fixedly connected to the outside of the cuff 2. The weight plate 16 is used to balance the unbalanced amount when the propeller is statically balanced.

[0037] Specifically, a stud 17 for connecting the propeller shaft is provided on the propeller housing 1, and a positioning pin 18 for locating the installation position of the propeller shaft is provided on the propeller housing 1. Specifically, the pitch rod is located on the inner side of the propeller shaft, and the propeller shaft is a hollow shaft.

[0038] Also includes a sealing ring 19 for dust prevention;

[0039] The specific propeller shell is formed by two parts that are arranged oppositely and connected relative to each other, and a positioning column is used for positioning when the connection is buckled.

[0040] In order to meet the combat requirements of new helicopters, facing the new servo pitch change mode, a new thrust propeller hub structure is designed, and a new thrust propeller is introduced. When the present invention is used, after the propeller shell, pitch change rod, blades and other components are assembled as required, when the entire thrust propeller is installed on the aircraft propeller shaft, the screw pile on the propeller shell is passed through the through hole on the propeller shaft to connect the entire thrust propeller to the aircraft, and at the same time, the cross through hole at the other end of the pitch change rod is aligned with the hole on the engine propeller shaft, and the positioning pin is passed through to complete the assembly of the thrust propeller on the aircraft;

[0041] When the thrust propeller is working, the axial movement of the pitch lever is driven by the axial movement of the control shaft controlled by the pilot to control the aircraft. At the same time, the pitch lever drives the shift sleeve to move axially, and the axial movement is converted into rotation of the blade through the shifting groove of the shift sleeve, thereby realizing the change of the blade angle and meeting the use requirements of the aircraft.

[0042] As for the device and the method of use disclosed in the embodiment, since they correspond to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hub structure of a thrust paddle, characterized in that, Comprising: A propeller housing (1), around which there are provided a plurality of cuffs (2) for mounting a propeller blade assembly, and through holes are respectively formed in the middle parts of both ends of the propeller housing (1); A pitch change rod (3), one end of which is slidably connected in the through hole, and the other end is connected to the control shaft of the aircraft to drive its axial movement; A shifting sleeve (4), which is fixed on the pitch change rod (3) and located in the inner cavity of the propeller housing (1) and axially moves along with the pitch change rod (3), and a shifting groove (7) is annularly provided around the shifting sleeve (4); A propeller root connection disk (5), which is rotatably connected in the cuff (2), one end of the propeller root connection disk (5) and located outside the propeller housing (1) is fixedly connected with a propeller blade (6), the propeller root connection disk (5) and the propeller blade (6) rotate synchronously, and an eccentric pin (15) is fixedly connected to the edge of the other end, and the eccentric pin (15) is adapted to be snap-fitted in the shifting groove (7) and drives the propeller root connection disk (5) to rotate along with the axial movement of the pitch change rod (3); The shifting sleeve (4) includes a shaft tube (401) and a shifting disk (402), the shifting disk (402) is integrally formed in the middle part on the outer side of the shaft tube (401), and the shifting groove (7) is annularly provided on the outer peripheral side of the shifting disk (402); a limiting block (8) for limiting one end of the shaft tube (401) is provided on the pitch change rod (3), the shaft tube (401) is adaptively sleeved on the pitch change rod (3) and one end thereof abuts against the limiting block (8), a threaded part is provided on the edge of the other end of the pitch change rod (3), and a limiting nut (9) is connected to the threaded part, and the limiting nut (9) abuts against the other end of the shaft tube (401); The shaft tube (401) is slidably connected in the through hole, a sliding copper sleeve (11) and a snap ring (12) for limiting the sliding copper sleeve (11) are annularly provided on the inner side wall of the through hole, and the sliding copper sleeve (11) is slidably connected to the outer side wall of the shaft tube (401); Threads are provided on the edge of one end of the shaft tube (401) corresponding to the threaded part, and a clamping nut (10) is connected to the threads, and the clamping nut (10) can abut against the propeller housing (1) and is used for limiting the axial movement stroke of the pitch change rod (3).

2. The hub structure of a thrust paddle according to claim 1, characterized in that, One end of the propeller housing (1) is fixedly connected with a propeller cap mounting disk (13), and a propeller cap (14) is fixedly connected to the propeller cap mounting disk (13), and the propeller cap (14) covers the outer peripheral side of the propeller housing (1).

3. The hub structure of a thrust paddle according to claim 1, characterized in that An annular groove for rotatably connecting the propeller root connection disk (5) is provided on the inner side wall of the cuff (2), and the propeller root connection disk (5) is rotatably connected in the annular groove in the circumferential direction.

4. The hub structure of a thrust paddle according to claim 1, characterized in that, A counterweight piece (16) for balancing the propeller blade is fixedly connected to the outside of the propeller housing (1) corresponding to the cuff.

5. The hub structure of a thrust paddle according to claim 2, characterized in that, A stud (17) for connecting a propeller shaft is provided on the propeller housing (1), and a positioning pin (18) for positioning the installation position of the propeller shaft is provided on the propeller housing (1).

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