Pitch angle fine adjustment mechanism of aerial variable pitch propeller and propeller

Abstract

The utility model discloses a pitch angle fine adjustment mechanism of an aerial variable pitch propeller and the propeller. The pitch angle fine adjustment mechanism comprises an adjustment worm and an adjustment worm gear, the adjusting worm comprises an operation section and a worm section which are connected in sequence; the adjusting worm wheel comprises a front shaft section, a worm wheel section and a rear shaft section which are connected in sequence; the worm section is meshed with the worm wheel section; the two adjusting worms are distributed on the two sides of the adjusting worm gear in parallel. And an eccentric connecting hole is axially formed in the adjusting worm gear and is used for connecting an eccentric variable-pitch pin. According to the utility model, the pitch angle of the propeller can be finely adjusted, the pitch angle error of different blades is eliminated, and the consistency of the pitch angles among the multiple blades is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of propellers, in particular to an aerial variable-pitch propeller pitch angle fine-tuning mechanism and a propeller. Background Art

[0002] The pitch angle of a variable pitch propeller refers to the angle between the chord line of the propeller blade and the plane of propeller rotation.

[0003] In a variable pitch propeller, the pitch angle can be adjusted according to different flight conditions. By changing the pitch angle, the propeller's thrust and pull force and efficiency can be adjusted.

[0004] When the pitch angle is reduced, the propeller blades are tilted more, which can generate greater thrust and pull at the same speed, but efficiency may decrease. Conversely, when the pitch angle is increased, the blade angle is relatively flat, which reduces thrust and pull, but efficiency may increase.

[0005] The more blades there are, the more important the pitch angle consistency between the blades is, which determines the push and pull force generated by each blade.

[0006] The pitch angle rotation of a variable-pitch propeller in the air is achieved by the pitch disc driving the circular motion of the pitch pin shaft. The pitch pin is fixed at a fixed angle on the pitch propeller handle and is integrally formed with the propeller body. Therefore, after forming, there will be a certain error in the angle of the blade chord relative to the pitch pin. When the pitch pin is in the same position, the pitch angles of different blades will have errors.

[0007] Therefore, an air-variable-pitch propeller pitch angle fine-tuning mechanism is needed to eliminate the error. Utility Model Content

[0008] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide an aerial variable-pitch propeller pitch angle fine-tuning mechanism and a propeller.

[0009] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0010] On the one hand, the utility model provides an aerial variable-pitch propeller pitch angle fine-tuning mechanism, including an adjusting worm and an adjusting worm wheel; the adjusting worm includes an operating section and a worm section connected in sequence; the adjusting worm wheel includes a front shaft section, a worm wheel section, and a rear shaft section connected in sequence; the worm section is meshed with the worm wheel section; two adjusting worms are provided, which are distributed in parallel on both sides of the adjusting worm wheel; an eccentric connecting hole is axially provided on the adjusting worm wheel, and the eccentric connecting hole is used to connect an eccentric pitch-changing pin.

[0011] Furthermore, it also includes two anti-loosening and limiting wires, and the anti-loosening and limiting wires are single wires;

[0012] Specifically, the anti-loosening limit wire includes an anti-loosening section, an indicating section, and an anti-slip section connected in sequence;

[0013] Specifically, the indicator section is connected to the anti-loosening section through a return bend, the indicator section is parallel to the anti-loosening section, and the anti-loosening section is connected to the anti-slip section through a bending head;

[0014] Specifically, the outer wall of the operating section of the adjusting worm is provided with a knurled axial groove, and the knurled axial groove cooperates with the indicating section of the anti-loosening limit wire;

[0015] Specifically, the front shaft section of the adjusting worm gear is covered with a second rotating sleeve, and the rear shaft section of the adjusting worm gear is covered with a third rotating sleeve. The second rotating sleeve is located on the outside, and the second rotating sleeve is provided with an anti-loosening ring groove. The anti-loosening section of the anti-loosening limit wire cooperates with the anti-loosening ring groove of the second rotating sleeve.

[0016] Furthermore, a tool slot is provided at the top of the operating section of the adjusting worm.

[0017] On the second aspect, the utility model provides an aerial variable pitch propeller, including a pitch disc, the pitch disc is provided with a base, the base is provided with a worm wheel countersink, two worm countersinks, and two anti-loosening holes, the axis of the worm wheel countersink is perpendicular to the axis of the worm countersink, the worm countersink and the worm wheel countersink have overlapping parts, the anti-loosening holes include a large diameter section and a small diameter section, the large diameter section and the worm countersink have overlapping parts, the small diameter section and the worm wheel countersink have overlapping parts; it also includes the pitch angle fine-tuning mechanism described in the first aspect; the adjustment worm wheel is located in the worm wheel countersink, The adjusting worm wheel is rotatably connected to the worm wheel countersink through the second rotating sleeve and the third rotating sleeve; a first rotating sleeve is provided at the bottom of the worm countersink, the adjusting worm is located in the worm countersink, the adjusting worm is meshed with the adjusting worm wheel, and the lower end of the adjusting worm is inserted into the first rotating sleeve; the anti-loosening limit wire is located in the anti-loosening hole, the indicating section and the upper part of the anti-loosening section of the anti-loosening limit wire are located at the large diameter section of the anti-loosening hole, the indicating section cooperates with the knurled axial groove of the adjusting worm, the lower part of the anti-loosening section is located at the small diameter section of the anti-loosening hole, and the anti-slip section extends out of the anti-loosening limit wire.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The utility model can realize the fine adjustment of the propeller pitch angle, eliminate the pitch angle error of different blades, and improve the consistency of the pitch angle among multiple blades.

[0020] 2. The anti-loosening section of the anti-loosening limit wire of the utility model can limit the axial position of the second rotating sleeve, thereby preventing loosening; the indicating section of the anti-loosening limit wire utilizes elastic cooperation to adjust the knurled axial groove on the outer wall of the worm operating section to form a limit and prevent loosening, and also plays a role in quantifying the amount of rotation; the anti-loosening section of the anti-loosening limit wire plays a role in preventing itself from loosening and falling off.

[0021] 3. The utility model does not require any screws, additional anti-loosening glue, or other anti-loosening measures when used in aviation propellers. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front view of the variable pitch propeller pitch angle fine adjustment mechanism of the utility model;

[0023] Figure 2 This is a top view of the variable pitch propeller pitch angle fine adjustment mechanism of the utility model;

[0024] Figure 3 It is a structural diagram of the base in the utility model;

[0025] Figure 4 The utility model is a schematic diagram of the assembly of the pitch angle fine-tuning mechanism of the aerial variable-pitch propeller.

[0026] In the figure: 1. Adjusting worm; 1.1. Operating section; 1.2. Worm section; 1.3. Tool slot; 2. First rotating sleeve; 3.1. Second rotating sleeve; 3.2. Third rotating sleeve; 4. Adjusting worm wheel; 4.1. Front shaft section; 4.2. Worm wheel section; 5. Anti-loosening limit wire; 5.1. Anti-loosening section; 5.2. Indicating section; 5.3. Anti-slip section; 6. Eccentric pitch-changing pin; 7. Base; 7.1. Worm wheel countersunk hole; 7.2. Worm countersunk hole; 7.3. Anti-loosening hole. DETAILED DESCRIPTION

[0027] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0028] Example 1: Please refer to Figures 1 to 4 The utility model provides an aerial variable-pitch propeller pitch angle fine-tuning mechanism, including an adjusting worm 1 and an adjusting worm wheel 4. The adjusting worm 1 includes an operating section 1.1 and a worm section 1.2 connected in sequence. The adjusting worm wheel 4 includes a front shaft section 4.1, a worm wheel section 4.2, and a rear shaft section connected in sequence. The worm section 1.2 is meshed with the worm wheel section 4.2. Two adjusting worms 1 are provided, which are distributed in parallel on both sides of the adjusting worm wheel 4. An eccentric connecting hole is axially provided on the adjusting worm wheel 4, and the eccentric connecting hole is used to connect an eccentric pitch-changing pin 6.

[0029] It also includes two anti-loosening and limiting wires 5, which are single wires. The anti-loosening and limiting wires 5 include an anti-loosening section 5.1, an indicator section 5.2, and an anti-slip section 5.3 connected in sequence. The indicator section 5.2 is connected to the anti-loosening section 5.1 through a return bend. The indicator section 5.2 is parallel to the anti-loosening section 5.1, and the anti-loosening section 5.1 is connected to the anti-slip section 5.3 through a bending head.

[0030] Specifically, a tool groove 1.3 is provided at the top of the operating section 1.1 of the adjusting worm 1 for rotating the adjusting worm 1; a knurled axial groove is provided on the outer wall of the operating section 1.1 of the adjusting worm 1, and the knurled axial groove cooperates with the indicating section 5.2 of the anti-loosening limit wire 5. When the adjusting worm 1 is rotated, the indicating section 5.2 is compressed and then rebounds to make a sound, which facilitates the operator to control the rotation angle.

[0031] Preferably, the tool slot 1.3 is a hexagonal slot.

[0032] Specifically, the front shaft section 4.1 of the adjusting worm gear 4 is covered with a second rotating sleeve 3.1, and the rear shaft section of the adjusting worm gear 4 is covered with a third rotating sleeve 3.2. The second rotating sleeve 3.1 is located on the outside, and the second rotating sleeve 3.1 is provided with an anti-loosening ring groove. The anti-loosening section 5.1 of the anti-loosening limit wire 5 cooperates with the anti-loosening ring groove of the second rotating sleeve 3.1 to prevent the second rotating sleeve 3.1 from falling out.

[0033] Preferably, the second rotating sleeve 3.1 and the third rotating sleeve 3.2 are copper sleeves.

[0034] The pitch angle fine-tuning mechanism needs to be placed in the base 7. By rotating the worm 1 on one side to drive the worm wheel 4 to rotate, the axial relative position of the eccentric pitch pin 6 is changed to adjust the angle of the pitch angle relative to the pitch disc.

[0035] Example 2: Based on Example 1, this example provides a variable pitch propeller, which includes a variable pitch disc, which is provided with a base 7, which is provided with a worm wheel countersunk hole 7.1, two worm countersunk holes 7.2, and two anti-loosening holes 7.3. The axis of the worm wheel countersunk hole 7.1 is perpendicular to the axis of the worm countersunk hole 7.2, and the worm countersunk hole 7.2 has an overlapping portion with the worm wheel countersunk hole 7.1. The anti-loosening hole 7.3 includes a large diameter section and a small diameter section, the large diameter section has an overlapping portion with the worm countersunk hole 7.2, and the small diameter section has an overlapping portion with the worm wheel countersunk hole 7.1.

[0036] Specifically, the adjusting worm gear 4 is located in the worm gear countersunk hole 7.1, and the adjusting worm gear 4 is rotationally connected to the worm gear countersunk hole 7.1 through the second rotating sleeve 3.1 and the third rotating sleeve 3.2.

[0037] Specifically, a first rotating sleeve 2 is provided at the bottom of the worm countersunk hole 7.2, the adjusting worm 1 is located in the worm countersunk hole 7.2, the adjusting worm 1 is engaged with the adjusting worm wheel 4, and the lower end of the adjusting worm 1 is inserted into the first rotating sleeve 2.

[0038] Preferably, the first rotating sleeve 2 is a copper sleeve.

[0039] Specifically, the anti-loosening limit wire 5 is located in the anti-loosening hole 7.3, and the indicating section 5.2 and the upper part of the anti-loosening section 5.1 of the anti-loosening limit wire 5 are located in the large diameter section of the anti-loosening hole 7.3. The indicating section 5.2 cooperates with the knurled axial groove of the adjusting worm 1, and the lower part of the anti-loosening section 5.1 is located in the small diameter section of the anti-loosening hole 7.3. The anti-slip section 5.3 extends out of the anti-loosening limit wire 5 to prevent the anti-loosening limit wire 5 from falling out. The large diameter section, the indicating section 5.2 and the upper part of the anti-loosening section 5.1 also play a role in preventing the anti-loosening limit wire 5 from rotating.

[0040] A specific application example, announcement number CN209192206U, discloses a variable pitch propeller and an unmanned aerial vehicle, hereinafter referred to as the example document, which combines the base 7 with the linkage part of the example document. The linkage part is the variable pitch disk of the example document, and the eccentric variable pitch pin 6 is connected through the air variable pitch propeller pitch angle fine-tuning mechanism. The eccentric variable pitch pin 6 is rotatably connected to the transmission rod of the example document. By fine-tuning the position of the eccentric variable pitch pin 6, the transmission rod is fine-tuned, and then the blade position is fine-tuned.

[0041] Example 3: Based on Example 2, this example provides a method for installing an air-variable-pitch propeller pitch angle fine-tuning mechanism, comprising the following steps:

[0042] The two adjusting worms 1 are divided into a first adjusting worm and a second adjusting worm; the two worm countersunk holes 7.2 are divided into a first worm countersunk hole and a second worm countersunk hole.

[0043] Put the first rotating sleeve 2 into the two worm countersunk holes 7.2, and insert the second rotating sleeve 3.1 and the third rotating sleeve 3.2 into the front shaft section 4.1 and the rear shaft section of the adjustment worm wheel 4.

[0044] Install the adjusting worm wheel 4, the second rotating sleeve 3.1 and the third rotating sleeve 3.2 into the worm wheel hole 7.1.

[0045] Use a tool to screw the first adjusting worm into the first worm countersunk hole so that the first adjusting worm contacts the first rotating sleeve 2. At this time, the position of the eccentric connecting hole on the adjusting worm wheel 4 can be adjusted by rotating the first adjusting worm.

[0046] Then use a tool to lock the first adjusting worm, and use a tool to screw the second adjusting worm into the second worm countersunk hole so that the second adjusting worm contacts the first rotating sleeve 2, and continues to screw in to apply pre-tightening force.

[0047] Insert the anti-loosening limit wire 5 into the anti-loosening hole 7.3, and bend the anti-loosening section 5.3 after passing through the anti-loosening hole 7.3;

[0048] Finally, the eccentric pitch-changing pin 6 is plugged into the eccentric connecting hole.

[0049] Example 4: Based on Example 2, this example provides a method for using an air-variable-pitch propeller pitch angle fine-tuning mechanism:

[0050] The two adjusting worms 1 are divided into a first adjusting worm and a second adjusting worm; the two worm countersunk holes 7.2 are divided into a first worm countersunk hole and a second worm countersunk hole.

[0051] Use a tool to lock the first adjusting worm, and use a tool to unscrew the second adjusting worm out of the second worm countersunk hole. At this time, rotating the first adjusting worm can rotate the adjusting worm wheel 4 and adjust the position of the eccentric pitch pin 6.

[0052] After adjusting to the desired angle, use a tool to lock the first adjusting worm, use a tool to screw the second adjusting worm into the second worm countersunk hole, so that the second adjusting worm contacts the first rotating sleeve 2, continue to screw in, apply pre-tightening force, and complete fine-tuning.

[0053] All components not discussed in detail in this application and the connection methods of the components in this application are well-known technologies in the technical field and can be directly applied without further explanation.

[0054] In this utility model, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0055] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions 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 unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0056] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An air-variable pitch propeller pitch angle fine-tuning mechanism, characterized in that: Including adjusting the worm and adjusting the worm wheel; The adjusting worm comprises an operating section and a worm section connected in sequence; The adjusting worm gear comprises a front shaft section, a worm gear section, and a rear shaft section connected in sequence; The worm segment is meshed with the worm wheel segment; Two adjusting worms are provided and are distributed in parallel on both sides of the adjusting worm wheel; The adjusting worm wheel is axially provided with an eccentric connecting hole, and the eccentric connecting hole is used to connect the eccentric pitch-changing pin.

2. The air-variable-pitch propeller pitch angle fine-tuning mechanism according to claim 1, characterized in that: It also includes two anti-loosening and limiting wires, and the anti-loosening and limiting wires are single wires; The anti-loosening limit wire comprises an anti-loosening section, an indicating section, and an anti-slip section connected in sequence; The indicating section is connected to the anti-loosening section via a return bend, the indicating section is parallel to the anti-loosening section, and the anti-loosening section is connected to the anti-slip section via a bending head; The outer wall of the operating section of the adjusting worm is provided with a knurled axial groove, and the knurled axial groove cooperates with the indicating section of the anti-loosening limit wire; The front shaft section of the adjusting worm gear is covered with a second rotating sleeve, and the rear shaft section of the adjusting worm gear is covered with a third rotating sleeve. The second rotating sleeve is located on the outside, and the second rotating sleeve is provided with an anti-loosening ring groove. The anti-loosening section of the anti-loosening limit wire cooperates with the anti-loosening ring groove of the second rotating sleeve.

3. The air-variable-pitch propeller pitch angle fine-tuning mechanism according to claim 2, characterized in that: A tool groove is provided at the top of the operating section of the adjusting worm.

4. An aerial variable pitch propeller, comprising a pitch disc, wherein the pitch disc is provided with a base, characterized in that: The base is provided with a worm wheel countersink, two worm countersinks, and two anti-loosening holes. The axis of the worm wheel countersink is perpendicular to the axis of the worm countersink. The worm countersink and the worm wheel countersink have overlapping parts. The anti-loosening holes include a large diameter section and a small diameter section. The large diameter section has an overlapping part with the worm countersink, and the small diameter section has an overlapping part with the worm wheel countersink. Also includes the pitch angle fine-tuning mechanism according to claim 3; The adjusting worm gear is located in the worm gear countersunk hole, and the adjusting worm gear is rotatably connected to the worm gear countersunk hole through the second rotating sleeve and the third rotating sleeve; A first rotating sleeve is provided at the bottom of the worm countersink, the adjusting worm is located in the worm countersink, the adjusting worm is engaged with the adjusting worm wheel, and the lower end of the adjusting worm is inserted into the first rotating sleeve; The anti-loosening limit wire is located in the anti-loosening hole, the indicating section and the upper part of the anti-loosening section of the anti-loosening limit wire are located in the large diameter section of the anti-loosening hole, the indicating section cooperates with the knurled axial groove of the adjusting worm, the lower part of the anti-loosening section is located in the small diameter section of the anti-loosening hole, and the anti-slip section extends out of the anti-loosening limit wire.

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