A composite material torsion return spring for variable pitch propellers

Abstract

This invention relates to the field of torsion return spring technology and discloses a composite material torsion return spring for a variable-pitch propeller. The spring includes a blade, with a rotating rod fixedly connected to the blade. A fixing block is fixedly fitted around the outer periphery of the rotating rod. Torsion return spring components are provided around the outer periphery of the rotating rod, and these components are linked together. A limiting support mechanism is connected to each torsion return spring component to limit its position, thereby stabilizing the position of the torsion return spring component in the radial direction of the rotating rod. This invention proposes a composite material torsion return spring for a variable-pitch propeller. By incorporating torsion return spring components, this invention enables transmission between torsion return springs, avoiding direct torsion of the torsion return springs as in previous methods. This provides a buffering effect on the torsion return springs, reducing the likelihood of damage. Furthermore, in the event of damage, only one component needs to be replaced, reducing replacement costs.

Description

Technical Field

[0001] This invention relates to the field of torsion return springs, and more particularly to a composite material torsion return spring for variable pitch propellers. Background Technology

[0002] The return spring mechanism in variable-pitch propeller systems currently mostly uses a metal structure. Metal return spring mechanisms are heavy and complex in structure, which is detrimental to weight reduction and reliability improvement of aircraft. Composite materials have excellent characteristics such as high specific stiffness, high specific strength, and strong design flexibility, and are widely used in load-bearing components of various aircraft. If composite materials are used to replace traditional metal materials through reasonable design, the return spring mechanism can be greatly simplified, and weight reduction can be achieved.

[0003] Traditional metal return spring mechanisms are heavy and complex in structure. Since the return spring is usually connected to one blade, the blade rotates directly and acts on the return spring. This reciprocating use directly and rigidly puts stress on the return spring, causing fatigue damage and preventing the blade from returning to its original position. Replacing the entire spring would be wasteful.

[0004] To address the aforementioned issues, this application proposes a composite material torsion return spring for variable pitch propellers. Summary of the Invention

[0005] (a) Purpose of the invention

[0006] To address the technical problems existing in the background art, this invention proposes a composite material torsion return spring for variable pitch propellers. By incorporating a torsion return spring component, this invention enables transmission between torsion return springs, thereby avoiding the direct torsion of the torsion return springs as in the past, thus providing a buffering effect on the torsion return springs and reducing the occurrence of damage. Furthermore, in the event of damage, only one of them needs to be replaced, thereby reducing the cost of replacement.

[0007] (II) Technical Solution

[0008] To address the above problems, the present invention provides a composite material torsion return spring for a variable pitch propeller, comprising a blade, wherein the blade is fixedly connected to a rotating rod;

[0009] A fixing block is fixedly fitted around the outer periphery of the rotating rod;

[0010] The outer periphery of the rotating rod is provided with a torque return spring, and the torque return springs are linked together.

[0011] The torque reset spring is connected to a limiting support mechanism for limiting the position of the torque reset spring, so as to stabilize the position of the torque reset spring in the radial direction of the rotating rod.

[0012] Preferably, the torque return spring component includes a torque return spring, a mounting ring, and a rotating ring. The rotating ring is rotatably mounted on the mounting ring and located outside the rotating rod. The torque return spring is located on the outer periphery of the rotating rod. One end of the torque return spring is fixedly connected to a fixing block, and the other end of the torque return spring is fixedly connected to the rotating ring.

[0013] Preferably, a rolling element is rotatably sleeved on the rotating ring, and the rolling element is rotatably connected to the mounting ring.

[0014] Preferably, the limiting support mechanism includes a support rod and a fastening bolt. The outer circumference of the mounting ring is slidably connected to the support rod via a slider. The fastening bolt is threaded onto the support rod and is used to limit the position of the slider.

[0015] Preferably, the slider has a positioning hole on the side near the fastening bolt.

[0016] Preferably, the insertion end of the fastening bolt is fixedly connected to a ferrule for insertion into the positioning hole.

[0017] Preferably, the torsion return spring is composed of high-strength fiber material and epoxy resin or polyester resin matrix material.

[0018] Preferably, the end of the support rod away from the blade forms a mounting portion.

[0019] Preferably, the mounting portion is threaded with a mounting bolt.

[0020] The above-described technical solution of the present invention has the following beneficial technical effects:

[0021] When the blade adjusts its angle around the pivot, the fixed block drives the torque return spring connected to it to twist. The twisting of the uppermost torque return spring drives the subsequent torque return springs to rotate through the rotating ring. The use of multiple return springs buffers the rotation of the blade to adjust its angle, avoiding direct hard action and thus improving its service life. By having multiple torque return springs, only one torque return spring needs to be replaced when it is damaged, reducing maintenance costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a composite material torsion return spring for a variable pitch propeller proposed in this invention.

[0023] Figure 2 This is a side cross-sectional view of the rotating ring of a composite material torsion return spring for a variable pitch propeller proposed in this invention.

[0024] Figure 3This is a top cross-sectional view of the support rod in a composite material torsion return spring for a variable pitch propeller proposed in this invention.

[0025] Figure 4 This is a schematic diagram of the slider in a composite material torsion return spring for a variable pitch propeller proposed in this invention.

[0026] Reference numerals: 1. Blade; 2. Rotating rod; 3. Fixing block; 4. Torque return spring; 41. Torque return spring; 42. Mounting ring; 43. Rotating ring; 44. Sliding block; 441. Positioning hole; 5. Limiting support mechanism; 51. Support rod; 52. Fastening bolt. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0028] like Figure 1-4 As shown, the present invention proposes a composite material torsion return spring for a variable pitch propeller, which includes a blade 1 and a rotating rod 2 fixedly connected to the blade 1.

[0029] The outer periphery of the rotating rod 2 is fixed with a fixing block 3;

[0030] Torque return spring 4 is provided on the outer periphery of the rotating rod 2, and the torque return springs 4 are linked together;

[0031] The torque reset spring 4 is connected to a limiting support mechanism 5 for limiting the torque reset spring 4, so as to stabilize the position of the torque reset spring 4 in the radial direction of the rotating rod 2.

[0032] In an optional embodiment, the torque return spring 4 includes a torque return spring 41, a mounting ring 42, and a rotating ring 43. The rotating ring 43 is rotatably mounted on the mounting ring 42 and located outside the rotating rod 2. The torque return spring 41 is located on the outer periphery of the rotating rod 2. One end of the torque return spring 41 is fixedly connected to the fixing block 3, and the other end of the torque return spring 41 is fixedly connected to the rotating ring 43.

[0033] It should be noted that there are multiple torsion return springs 41, and the ends of the torsion return springs 41 located in the middle are fixedly connected to the rotating rings 43.

[0034] The end of the bottommost torsion return spring 41 away from the rotating ring 43 is connected to the turbine shaft (the initial return torque of the return spring is applied by pre-twisting the torsion return spring 41 at this end by an angle).

[0035] In an optional embodiment, a rolling element is rotatably sleeved on the swivel ring 43, and the rolling element is in rolling connection with the mounting ring 42.

[0036] Specifically, the rolling element is a ball or roller to increase the smoothness of rotation of the ring 43.

[0037] In an optional embodiment, the limiting support mechanism 5 includes a support rod 51 and a fastening bolt 52. The outer periphery of the mounting ring 42 is slidably connected to the support rod 51 via a slider 44. The fastening bolt 52 is threaded onto the support rod 51 and is used to limit the position of the slider 44.

[0038] It should be noted that the support rod 51 serves to stabilize the radial position of the mounting ring 42.

[0039] In an optional embodiment, the slider 44 has a positioning hole 441 on the side near the fastening bolt 52.

[0040] Furthermore, the insertion end of the fastening bolt 52 is fixedly connected to a insert shaft for insertion into the positioning hole 441.

[0041] It should be noted that, under the action of the fastening bolt 52, rotating the fastening bolt 52 drives the insert shaft to be inserted into the positioning hole 441, thereby positioning the slider 44 and stabilizing the position of the mounting ring 42.

[0042] In an optional embodiment, the torsion return spring 41 is composed of high-strength fiber material and epoxy resin or polyester resin matrix material.

[0043] These materials are processed into composite materials using special techniques, which can provide high strength, stiffness and fatigue resistance, while also having a light weight and excellent corrosion resistance.

[0044] In an optional embodiment, the end of the support rod 51 away from the blade 1 forms a mounting portion.

[0045] Furthermore, the mounting section is threaded with mounting bolts.

[0046] It should be noted that the mounting bolts are fixedly connected to the turbine shaft to stabilize one end of the support rod 51.

[0047] In this invention, when the blade 1 adjusts its angle around the rotating rod 2, the fixed block 3 drives the torque return spring 41 connected to it to rotate. When the uppermost torque return spring 41 rotates, the rotating ring 43 drives the subsequent torque return springs 41 to rotate. The use of multiple return springs 41 buffers the rotation of the blade 1 to adjust its angle, avoiding direct hard action and thus improving its durability. By providing multiple torque return springs 41, only one torque return spring 41 needs to be replaced when it is damaged, reducing maintenance costs.

[0048] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A composite material torsion return spring for a variable-pitch propeller, comprising blades (1), characterized in that: The blade (1) is fixedly connected to a rotating rod (2); The outer periphery of the rotating rod (2) is fixedly fitted with a fixing block (3); The outer periphery of the rotating rod (2) is provided with a torque return spring component (4). The torque return spring component (4) includes a torque return spring (41), a mounting ring (42), and a rotating ring (43). The rotating ring (43) is rotatably mounted on the mounting ring (42) and located outside the rotating rod (2). The torque return spring (41) is located on the outer periphery of the rotating rod (2). There are multiple torque return springs (41). One end of the uppermost torque return spring (41) is fixedly connected to the fixing block (3). The other end of the spring (41) is fixedly connected to the rotating ring (43). The ends of the torque return spring (41) in the middle are fixedly connected to the rotating ring (43). The end of the torque return spring (41) at the bottom away from the rotating ring (43) is connected to the turbine shaft. The torque return spring components (4) are linked together. The torque return spring (41) connected to it is driven to twist through the fixing block (3). When the torque return spring (41) at the top twists, the subsequent torque return spring (41) is driven to rotate through the rotating ring (43). The torque reset spring (4) is connected to a limiting support mechanism (5) for limiting the torque reset spring (4) to stabilize the position of the torque reset spring (4) in the radial direction of the rotating rod (2).

2. The composite material torsion return spring for a variable-pitch propeller according to claim 1, characterized in that, A rolling element is rotatably sleeved on the rotating ring (43), and the rolling element is rotatably connected to the mounting ring (42).

3. A composite material torsion return spring for a variable-pitch propeller according to claim 2, characterized in that, The limiting support mechanism (5) includes a support rod (51) and a fastening bolt (52). The outer periphery of the mounting ring (42) is slidably connected to the support rod (51) through a slider (44). The fastening bolt (52) is threaded onto the support rod (51) and is used to limit the position of the slider (44).

4. A composite material torsion return spring for a variable-pitch propeller according to claim 3, characterized in that, The slider (44) has a positioning hole (441) on the side near the fastening bolt (52).

5. A composite material torsion return spring for a variable-pitch propeller according to claim 4, characterized in that, The insertion end of the fastening bolt (52) is fixedly connected to a shank for insertion into the positioning hole (441).

6. A composite material torsion return spring for a variable-pitch propeller according to any one of claims 1-5, characterized in that, The torsion return spring (41) is composed of high-strength fiber material and epoxy resin and polyester resin matrix material.

7. A composite material torsion return spring for a variable-pitch propeller according to claim 5, characterized in that, The end of the support rod (51) away from the blade (1) forms a mounting part.

8. A composite material torsion return spring for a variable-pitch propeller according to claim 7, characterized in that, The mounting section is threaded with mounting bolts.

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