Blade folding device suitable for rigid rotor wing and folding method thereof

Abstract

The invention belongs to the technical field of helicopter propeller hub structure design, and particularly relates to a propeller blade folding device suitable for a rigid rotor wing and a folding method of the propeller blade folding device. Comprising a rack, a folding driving device, a folding pull rod, a main driving pull rod, a driven block, a composite rocker arm, a lock pin connecting rod, a lock pin, a transverse pin connecting rod and a transverse pin, and when the rigid rotor blade is folded, locking of a propeller hub supporting arm, unlocking of the root of the blade and folding of the blade can be achieved; when the rigid rotor blade is unfolded, the unfolding of the blade, the unlocking of the propeller hub support arm and the locking of the shimmy direction of the root part of the blade can be realized. The number of parts and the number of movement joints are small, the number of needed actuators is small, reliability and maintainability are good, and the design and manufacturing cost of the helicopter can be effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of helicopter hub structure design, and particularly relates to a blade folding device applicable to a rigid rotor and a folding method thereof. Background Art

[0002] By means of blade folding, the space occupied by the helicopter during parking can be reduced, and the safety of the helicopter during parking can be improved at the same time.

[0003] In order to ensure the accuracy of the trajectory and position during and after the blade folding process, a hub arm locking device and a blade driving device need to be designed in the blade folding device.

[0004] The traditional hub arm locking device and blade driving device are relatively independent and need to be centrally managed by an electromechanical integrated management system, which has the characteristics of complex product structure, large number of parts, large weight, and low reliability. Summary of the Invention

[0005] Object of the Invention: To provide a blade folding device applicable to a rigid rotor and a folding method thereof.

[0006] Technical Solution:

[0007] A blade folding device applicable to a rigid rotor includes: a frame 2, a folding driving device 3, a folding pull rod 4, a main driving pull rod 5, a driven block 6, a composite rocker arm 7, a locking pin link 8, a locking pin 9, a transverse pin link 10, and a transverse pin 11. Among them,

[0008] The frame 2 is installed on the hub arm 12. The housing 17 of the folding driving device 3 is fixedly connected to the blade 13 by a circle of screws. One end of the folding pull rod 4 is fixedly connected to the frame 2 through a spherical bearing, and the other end slides in the chute at the output end 15 of the folding driving device 3;

[0009] Both ends of the main driving pull rod 5 are designed with rod end spherical bearings, and one end of the main driving pull rod 5 is fixedly connected to the double fork ear at the output end 15 of the folding driving device 3, and the other end of the main driving pull rod 5 is fixedly connected to the upper end of the driven block 6.

[0010] The composite rocker arm 7 is composed of three rocker arms combined together. One end of the middle rocker arm of the composite rocker arm 7 is connected to the lower end of the driven block 6, and the driven block 6 and the composite rocker arm 7 can rotate relative to each other; One end of the two side rocker arms of the composite rocker arm 7 is respectively connected to one end of the locking pin link 8 and one end of the transverse pin link 10 through spherical bearings, and the other ends of the two side rocker arms of the composite rocker arm 7 and the other end of the middle rocker arm of the composite rocker arm 7 are fixedly connected to the frame 2;

[0011] The other end of the locking pin link 8 is connected to one end of the locking pin 9 through a spherical joint bearing; the other end of the transverse pin link 10 is connected to the transverse pin 11 through a revolute pair, and the other end of the locking pin 9 is fixed on the hub central member 14.

[0012] Further, a cam 16 is provided on the housing 17 of the folding drive device 3, and the cam 16 realizes the mechanical limit of the folding pull rod 4 during the folding / unfolding process of the blade.

[0013] Further, the chute at the output end 15 of the folding drive device 3 is an arc-shaped chute.

[0014] Further, the other ends of the rocker arms on both sides of the compound rocker arm 7 and the other end of the rocker arm in the middle of the compound rocker arm 7 are fixed to the frame 2 by bolts.

[0015] Further, the spherical joint bearing is a spherical joint bearing.

[0016] Further, the other end of the folding pull rod 4 slides in the chute at the output end 15 of the folding drive device 3 through a cylindrical pin.

[0017] Further, one end of the transverse pin 11 is a plane and the other end is an arc surface. The plane end is used to limit the movement of the blade in the flapping direction, and the arc surface is used to realize the linear movement of the transverse pin 11 in the frame 2.

[0018] A blade folding method applicable to a rigid rotor, comprising:

[0019] Before the blade is folded, the frame 2, the blade 13 and the hub arm 12 are fixed; the output end 15 of the folding drive device 3 rotates around its axis, driving the main drive pull rod 5 and the driven block 6 to slide along the chute of the frame 2; the driven block 6 drives the compound rocker arm 7 to generate a rotational movement; the compound rocker arm 7 drives the locking pin link 8 and the transverse pin link 10 to generate relative rotation; the locking pin link 8 drives the locking pin 9 to move linearly, realizing the position locking of the pitch freedom of the hub arm 12; the transverse pin link 10 drives the transverse pin 11 to move linearly, realizing the pin pulling action of the transverse pin 11 of the blade;

[0020] The other end of the output end 15 of the folding drive device 3 drives the folding pull rod 4 to slide along its chute. When the folding pull rod 4 slides to the limit position of the chute at the output end 15 of the folding device 3, the folding pull rod 4 cannot continue to slide, and the output end 15 of the folding drive device 3 becomes a fixed part. The housing 17 of the folding drive device 3 drives the blade 13 to rotate in the opposite rotational direction, realizing the folding movement of the blade;

[0021] When the blade is unfolded, the folding drive device 3 is powered on and started. The folding pull rod 4 is limited in the chute at the output end 15 of the folding drive device 3 by the cam 16, making the output end 15 of the folding drive device 3 fixed. The blade 13 performs a reverse rotational movement, realizing the unfolding of the blade 13;

[0022] After the unfolding of the blade 13 is completed, the rotational movement of the blade 13 will be restricted by the frame 2. At this time, the cam 16 on the housing 17 of the folding drive device 3 will release the mechanical limit on the folding pull rod 4. One end of the output end 15 of the folding drive device 3 drives the main drive pull rod 5 and the driven block 6 to slide in the opposite direction along the chute of the frame 2. The driven block 6 drives the middle rocker of the compound rocker arm 7 to rotate relatively. The middle rocker of the compound rocker arm 7 will drive the rockers on both sides to rotate simultaneously. The rockers on both sides of the compound rocker arm will drive the lock pin link 8 and the cross pin link 10 to move. The lock pin 8 drives the lock pin 9 to move linearly, realizing the position unlocking of the pitch freedom of the hub arm 12; the cross pin link 10 drives the cross pin 11 to move linearly, completing the pin insertion action of the lateral pin 11 of the blade, and realizing the position locking of the blade 13 in the flapping direction. The other end of the output end 15 of the folding drive device 3 drives the folding pull rod 4 to slide in its chute until it is locked at the limit position.

[0023] Beneficial effects:

[0024] The present invention provides a blade folding device applicable to a rigid rotor. When the rigid rotor blade is folded, it can realize the locking of the hub arm, the unlocking of the blade root, and the folding of the blade; when the rigid rotor blade is unfolded, it can realize the unfolding of the blade, the unlocking of the hub arm, and the locking of the blade root in the flapping direction. The invention has fewer component parts and moving joints, and also requires fewer actuators, with better reliability and maintainability, which can effectively reduce the design and manufacturing costs of the helicopter. Description of the drawings

[0025] Figure 1 is a schematic diagram of a rigid blade folding system in the blade unfolding state;

[0026] Figure 2 is a schematic diagram of a rigid blade folding system in the blade folding state;

[0027] Figure 3 is a schematic diagram of the structure of the folding drive device.

[0028] Among them, the blade folding device 1, the frame 2, the folding drive device 3, the folding pull rod 4, the main drive pull rod 5, the driven block 6, the compound rocker arm 7, the lock pin link 8, the lock pin 9, the cross pin link 10, the cross pin 11, the hub arm 12, the blade 13, the hub central member 14, the output end 15, the cam 16, the housing 17. Specific implementation manner

[0029] To make the purpose, technical solutions, and advantages of the present application more clear, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application. The embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "axial direction", "vertical", "upper", "lower", "upper end", "bottom end", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present invention.

[0031] Such as Figures 1-3 , a blade folding device applicable to a rigid rotor, the blade folding device 1 includes: a frame 2, a folding driving device 3, a folding pull rod 4, a main driving pull rod 5, a driven block 6, a composite rocker arm 7, a locking pin link 8, a locking pin 9, a transverse pin link 10, and a transverse pin 11.

[0032] The frame 2 is installed on the hub arm 12, the housing 17 of the folding driving device 3 is fixedly connected to the blade 13 by a circle of screws, one end of the folding pull rod 4 is fixedly connected to the frame through a spherical plain bearing, and the other end can slide in the chute of the output end 15 of the folding driving device 3.

[0033] Both ends of the main driving pull rod 5 are designed with rod end spherical plain bearings, and one end is fixedly connected to the double fork ear of the output end 15 of the folding driving device 3, and the other end is fixedly connected to the driven block 6. The composite rocker arm 7 is composed of three rocker arms combined together. The middle rocker arm of the composite rocker arm 7 is connected to the lower end of the driven block 6, and relative rotation is possible between the driven block 6 and the composite rocker arm 7; the rocker arms on both sides of the composite rocker arm 7 are respectively connected to the locking pin link 8 and the transverse pin link 10 through spherical plain bearings. The locking pin link 8 is fixedly connected to the locking pin 9 through a spherical plain bearing; the transverse pin link 10 is connected to the transverse pin 11 and can achieve relative rotational movement.

[0034] Before the blade is folded, the frame 2, the blade 13 and the hub support arm 12 are fixed. The output end 15 of the folding drive device 3 rotates around its axis, driving the main drive rod 5 and the driven block 6 to slide along the chute of the frame 2; the driven block 6 drives the composite rocker arm 7 to generate a rotational motion; the composite rocker arm 7 drives the lock pin link 8 and the cross pin link 10 to generate relative rotation; the lock pin link 8 drives the lock pin 9 to move linearly to lock the position of the hub support arm 12 in the pitch freedom; the cross pin link 10 drives the cross pin 11 to move linearly to perform the pin extraction action of the blade transverse pin 11. At the same time, the other end of the output end 15 of the folding drive device 3 drives the folding rod 4 to slide along its chute. When the folding rod 4 slides to the limit position of the chute of the output end 15 of the folding device 3, the folding rod 4 cannot slide further, and the output end 15 of the folding drive device 3 becomes a fixed part. The housing 17 of the folding drive device 3 drives the blade 13 to rotate in the opposite rotation direction to realize the folding motion of the blade.

[0035] A cam 16 structure is designed on the housing 17 of the folding drive device 3. When the housing 17 of the folding drive device 3 drives the blade 13 to fold and rotate, the cam 16 rotates with the folding drive device 3. Through reasonable structural dimension design, the cam 16 can realize the mechanical limit of the folding rod 4 during the folding / unfolding process of the blade.

[0036] When the blade is unfolded, the folding drive device 3 is powered on and started. The folding rod 4 is limited in the chute of the output end 15 of the folding drive device 3 by the cam 16, making the output end 15 of the folding drive device 3 fixed. The blade 13 performs a reverse rotational motion to realize the unfolding of the blade 13.

[0037] After the blade 13 is unfolded, the rotational motion of the blade 13 is restricted by the frame 2. At this time, the cam on the housing 17 of the folding drive device 3 releases the mechanical limit on the folding rod 4. One end of the output end 15 of the folding drive device 3 drives the main drive rod 5 and the driven block 6 to slide in the opposite direction along the chute of the frame 2. The driven block 6 drives the middle rocker arm of the composite rocker arm 7 to rotate relatively. The middle rocker arm of the composite rocker arm 7 will drive the rocker arms on both sides to rotate at the same time. The rocker arms on both sides of the composite rocker arm will drive the lock pin link 8 and the cross pin link 10 to move. The lock pin 8 drives the lock pin 9 to move linearly to unlock the position of the hub support arm 12 in the pitch freedom; the cross pin link 10 drives the cross pin 11 to move linearly to complete the pin insertion action of the blade transverse pin 11 to lock the position of the blade 13 in the flapping direction. The other end of the output end 15 of the folding drive device 3 drives the folding rod 4 to slide in its chute until it is locked at the limit position.

[0038] 1. A blade folding device for a rigid rotor, which is composed of a hub support arm locking device and a blade drive device, and the hub support arm locking device and the blade drive device are connected by a mechanical mechanism to improve the reliability of blade folding;

[0039] 2. The hub strut locking device consists of a series of mechanical linkage mechanisms, which can convert the rotational motion of the blade drive device into the linear motion of the hub strut pitch lock pin and the blade lateral pin, realizing the locking of the pitch freedom of the hub strut and the unlocking / locking of the blade.

[0040] 3. The blade drive device and the blade pin are integrated into one design, with fewer parts, lower design and manufacturing costs, smaller occupied space, and better maintainability.

[0041] As described above, it is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by this application should be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A blade folding device applicable to a rigid rotor, characterized in that, Including: A frame, a folding drive device, a folding pull rod, a main drive pull rod, a driven block, a compound rocker arm, a locking pin link, a locking pin, a transverse pin link, a transverse pin. Among them, The frame is installed on the hub support arm. The housing of the folding drive device is fixedly connected to the blade by a circle of screws. One end of the folding pull rod is fixedly connected to the frame through a spherical joint bearing, and the other end slides in the chute at the output end of the folding drive device; Both ends of the main drive pull rod are designed with rod end spherical joint bearings. One end of the main drive pull rod is fixedly connected to the double fork ear at the output end of the folding drive device, and the other end of the main drive pull rod is fixedly connected to the upper end of the driven block. The compound rocker arm is composed of three rocker arms combined together. One end of the middle rocker arm of the compound rocker arm is connected to the lower end of the driven block, and the driven block and the compound rocker arm can rotate relative to each other; One end of the rocker arms on both sides of the compound rocker arm is respectively connected to one end of the locking pin link and one end of the transverse pin link through spherical joint bearings, and the other ends of the rocker arms on both sides of the compound rocker arm and the other end of the middle rocker arm of the compound rocker arm are fixedly connected to the frame; The other end of the locking pin link is connected to one end of the locking pin through a spherical joint bearing; The other end of the transverse pin link is connected to the transverse pin through a rotating pair, and the other end of the locking pin is fixedly connected to the central part of the hub.

2. The blade folding device applicable to a rigid rotor according to claim 1, characterized in that A cam is arranged on the housing of the folding drive device, and the cam realizes the mechanical limit of the folding pull rod during the folding / unfolding process of the blade.

3. The blade folding device applicable to a rigid rotor according to claim 1, characterized in that, The chute at the output end of the folding drive device is an arc chute.

4. The blade folding device applicable to a rigid rotor according to claim 1, characterized in that The other ends of the rocker arms on both sides of the compound rocker arm and the other end of the middle rocker arm of the compound rocker arm are fixedly connected to the frame by bolts.

5. The blade folding device applicable to a rigid rotor according to claim 1, characterized in that The spherical joint bearing is a spherical joint bearing.

6. The blade folding device applicable to a rigid rotor according to claim 1, characterized in that, The other end of the folding pull rod slides in the chute at the output end of the folding drive device through a cylindrical pin.

7. The blade folding device applicable to a rigid rotor according to claim 1, characterized in that One end of the transverse pin is a plane and the other end is an arc surface. The plane end is used to limit the movement of the blade in the flapping direction, and the arc surface is used to realize the linear movement of the transverse pin in the frame.

8. A blade folding method applicable to a rigid rotor, characterized in that, Including: Before the blade is folded, the frame, the blade and the hub support arm are fixed. The output end of the folding drive device rotates around its axis, driving the main drive pull rod and the driven block to slide along the chute of the frame; The driven block drives the compound rocker arm to generate a rotational movement; The compound rocker arm drives the locking pin link and the transverse pin link to generate relative rotation; The locking pin link drives the locking pin to move linearly to lock the position of the pitch freedom of the hub support arm; The transverse pin link drives the transverse pin to move linearly to realize the pin pulling action of the transverse pin of the blade; The other end of the output end of the folding drive device drives the folding pull rod to slide along its chute. When the folding pull rod slides to the limit position of the chute at the output end of the folding device, the folding pull rod cannot continue to slide, and the output end of the folding drive device becomes a fixed part. The housing of the folding drive device drives the blade to rotate in the opposite rotational direction to realize the folding movement of the blade; When the blade is unfolded, the folding drive device is powered on and started. The folding pull rod is limited in the chute at the output end of the folding drive device by the cam, making the output end of the folding drive device fixed. The blade rotates in the reverse direction to realize the unfolding of the blade. After the blade deployment is completed, the rotational movement of the blade will be restricted by the frame. At this time, the cam on the housing of the folding drive device will release the mechanical limit on the folding tie rod. One end of the output end of the folding drive device drives the main drive tie rod and the driven block to slide in the opposite direction along the chute of the frame. The driven block drives the middle rocker of the compound rocker arm to rotate relatively. The middle rocker of the compound rocker arm will simultaneously drive the rockers on both sides to rotate. The rockers on both sides of the compound rocker arm will drive the lock pin link and the cross pin link to move. The lock pin drives the lock pin to move linearly, realizing the position unlocking of the pitch freedom of the hub arm; the cross pin link drives the cross pin to move linearly, completing the pin insertion action of the lateral pin of the blade, realizing the position locking in the flapping direction of the blade. The other end of the output end of the folding drive device drives the folding tie rod to slide in its chute until it is locked at the limit position.

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