A device and method for measuring the torsional moment of a helicopter pull-tow strip

Abstract

This invention relates to a device and method for measuring the torsional torque of a helicopter torsion bar, comprising: a mounting base, with a support area formed on the upper part of the mounting base, the support area having a central support located in the middle and side supports symmetrically arranged on both sides, the central support restricting the Z-axis degree of freedom of the torsion bar; a torsion part, rotatably connected to the side supports, the rotation angle α being the torsion angle of the applied force, and the torsion part fixing both ends of the torsion bar, becoming an integral part with the torsion bar, and restricting the X-axis and Y-axis degrees of freedom of the torsion bar; a pre-set rotation hole for a torque wrench on the torsion part; and a locking part, the locking part locking the torsion part and the side supports, the torque wrench rotation directly measuring the torque corresponding to the torsion angle. This device can directly measure the torsional torque of the torsion bar without complex calculations, the measurement is simple, and the results are easier to obtain. Compared with indirect measurement methods, the measurement method of this invention is simple to operate, provides intuitive results, is low in cost, requires less manpower, and is economical.

Description

Technical Field

[0001] This invention relates to the field of aerospace technology, and more specifically to an apparatus and method for measuring the torsional torque of a helicopter torsion bar. Background Technology

[0002] The torsion bar is an important aerodynamic component on a helicopter, serving as a primary structural load-bearing element. Its main functions include bearing the centrifugal force generated by the rotor blades' rotation and the torque generated by the blades' pitch change. The balance of these forces and the stability of the torque play a crucial role in achieving the tail rotor's pitch change and improving the axial stress on the rotor hub. Therefore, it is necessary to measure the torsion bar torque.

[0003] Currently, the torque of tension bars is typically measured indirectly. This method involves measuring the elongation and torsion angle of the tension bar, then calculating the torsional torque using a mechanical model. However, this method requires high-precision measuring equipment and complex calculation formulas, making the measurement process rather cumbersome.

[0004] Therefore, how to provide a device that simplifies the measurement of torque on helicopter torsion bars is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] Therefore, one object of the present invention is to provide a device for measuring the torsional torque of a helicopter torsion bar, thereby solving the technical problem of complex indirect measurement and calculation of the torsional torque of a torsion bar in the prior art.

[0006] Another objective of this invention is to provide a method for measuring the torsional torque of a helicopter torsion bar, which simplifies the measurement process.

[0007] This invention provides a device for measuring the torsional torque of a helicopter torsion bar, comprising:

[0008] Mounting base, the upper part of which forms a support area, the support area having a central support located in the middle and side supports symmetrically arranged on both sides, the central support restricting the Z-direction degree of freedom of the tension bar;

[0009] The torsion part is rotatably connected to the side support, with a rotation angle α being the torsion angle of the applied force. The torsion part fixes both ends of the tension bar, becoming an integral part with the tension bar, and restricts the X-axis and Y-axis degrees of freedom of the tension bar. The torsion part has a pre-set rotation hole for a torque wrench.

[0010] And a locking part, which locks the torsion part and the side support, and the torque wrench rotates to directly measure the torque corresponding to the torsion angle.

[0011] Furthermore, the mounting base is a plate-shaped base with a central hole for mounting the central support and a central support fixing hole in the middle; and multiple connecting holes are provided on both sides corresponding to the side supports.

[0012] Furthermore, the base is provided with a weight-reducing groove.

[0013] Furthermore, the central support is a columnar support base, with its bottom protruding portion fitting into the central support fixing hole for installation, and its bottom plane fixed to the base; its top has a downwardly recessed transverse groove, which carries a transverse plate extending to both sides and close to the two torsion parts, the transverse plate being fixed to the bottom of the transverse groove, and carrying the tension-torsion strip on it; the groove walls on both sides of the transverse groove are provided with corresponding Z-direction limiting holes according to the center hole of the tension-torsion strip, and are fixed by a long pin passing through the Z-direction limiting hole and the center hole of the tension-torsion strip.

[0014] Furthermore, a fixed plane is formed on the outer wall of the groove.

[0015] Furthermore, the side support adopts an arc-shaped support plate, the bottom surface of which is fixed to the base, and a bearing hole is opened in the horizontal direction at the top of which is rotatably connected to the torsion part through a deep groove ball bearing; the lower part of the bearing hole has a pin hole and a limit pin hole.

[0016] Furthermore, the torsion part is an asymmetrical torsion block, which includes a plate-shaped torsion body. A support fixing platform is provided on the torsion body near the middle support side, and the support fixing platform fixes the end of the torsion bar. A cylindrical platform is provided on the side of the torsion body away from the support fixing platform, corresponding to the torsion bar. A square rotating hole is located in the cylindrical platform and penetrates the upper part of the torsion body. The lower part of the torsion body has a main body positioning pin hole and a torsion strip hole.

[0017] Furthermore, the cylindrical platform is inserted into the bearing hole, so that the end face of the torsion body fits against the arc-shaped support plate. The support fixing platform is vertically provided with a torsion bar end fixing hole, which is fixed by a positioning pin. The main body positioning pin hole at the lower part of the torsion body corresponds to the pin hole and is positioned by the pin. The torsion strip hole corresponds to the limit pin hole and is temporarily fixed by the limit pin and nut.

[0018] Furthermore, the limiting pin is externally limited by a pin, wherein the insert, the limiting pin, the nut, and the pin constitute the locking part.

[0019] The present invention provides a method for measuring the torsional torque of a helicopter torsion bar using the aforementioned device, comprising the following steps:

[0020] S1. Install the tension bar, fix the middle part of the tension bar to the middle support to restrict the Z-direction freedom of the tension bar; fix both ends of the tension bar to the torsion part to restrict the X-direction and Y-direction freedom of the tension bar.

[0021] S2. Measurement: First, position the locking part to ensure that the torsion angle a is 0°; insert the torque wrench into the rotating hole, and with the device in its initial state, release the locking part from its position and turn the torque wrench to rotate the torsion part; measure the maximum torque between 0°-15° and -15°-0° for the torsion bar; when measuring the torque, tighten the side support and the torsion part, keep the torsion angle unchanged, and read the value on the torque wrench.

[0022] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a device for measuring the torsional torque of a helicopter torsion bar. The device restricts the Z, X, and Y degrees of freedom of the torsion bar through a central support and side support, and fixes both ends of the torsion bar to the torsion part. A torque is applied by a torque wrench to make the torsion bar rotate and generate a corresponding rotation angle, and the torsional torque of the torque wrench is recorded. This device can directly measure the torsional torque of the torsion bar without complicated calculations. The measurement is simple and the results are easier to obtain. Compared with indirect measurement methods, the measurement method of the present invention is simple to operate, the results are intuitive, the cost is low, the manpower required is small, and the economy is good. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 The attached figure is a structural cross-sectional schematic diagram of a device for measuring the torsional moment of a helicopter torsion bar provided by the present invention;

[0025] Figure 2 The attached image is... Figure 1 Top view;

[0026] Figure 3 The attached image is... Figure 1 Side view;

[0027] Figure 4 The attached figure is a perspective view of a device for measuring the torsional torque of a helicopter torsion bar according to the present invention;

[0028] Figure 5 The attached diagram is a structural schematic of the base;

[0029] Figure 6The attached diagram is a schematic diagram of the arc-shaped support plate.

[0030] Figure 7 The attached diagram is a structural schematic of the support base;

[0031] Figure 8 The attached image is a 3D view of the torsion block from one perspective;

[0032] Figure 9 The attached image is a three-dimensional view of the torsion block from another perspective. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Because existing technologies for measuring the torque of torsion bars typically employ indirect measurement methods, requiring high-precision measuring equipment to minimize measurement errors, and complex calculations based on mechanical models after measurement, the measurement efficiency is low and the cost is high. Therefore, this invention discloses a device for measuring the torsional torque of a helicopter torsion bar, comprising: a mounting base, the upper part of which forms a support area, the support area having a central support located in the middle and side supports symmetrically arranged on both sides, the central support restricting the Z-axis degree of freedom of the torsion bar; a torsion part, rotatably connected to the side supports, the rotation angle α being the torsion angle of the applied force, and the torsion part fixing both ends of the torsion bar, becoming an integral part of the torsion bar, and restricting the X-axis and Y-axis degrees of freedom of the torsion bar; a pre-set rotation hole for a torque wrench on the torsion part; and a locking part, the locking part locking the torsion part and the side supports, the torque wrench rotation directly measuring the torque corresponding to the torsion angle.

[0037] The above solution restricts the Z, X, and Y degrees of freedom of the torsion bar through central support and side restraint, and fixes both ends of the torsion bar to the torsion part. A torque is applied by a torque wrench to make the torsion bar rotate to produce a corresponding rotation angle, and the torsional torque of the torque wrench is recorded. This device can directly measure the torsional torque of the torsion bar without complicated calculations. The measurement is simple and the results are easier to obtain. Compared with indirect measurement methods, the measurement operation of this invention is simple, the results are intuitive, the cost is low, the manpower required is small, and the economy is good.

[0038] In a specific embodiment of the present invention, see Appendix Figure 1-5 The mounting base is a plate-shaped base 15, with a central hole 151 for mounting the central support and a central support fixing hole 154 in the middle; multiple connecting holes 152 are provided on both sides corresponding to the side support. The multiple connecting holes 152 are positioned by a first pin 14 and the central support and base 15 are fixed by a first screw 13.

[0039] Advantageously, the base 15 is provided with a weight reduction groove 153.

[0040] Advantageously, in embodiments of the present invention, see appendix. Figure 4 and 7The central support is a columnar support base 8, with its bottom protruding part 81 cooperating with the central support fixing hole 154 for installation. Its bottom plane is fixed to the base 15 by pins, etc. The top of the support has a downwardly recessed transverse groove 82, which carries transverse plates 5 extending to both sides and close to the two torsion parts. The transverse plates 5 are fixed to the bottom of the transverse groove 82 (they can be positioned by a second pin 7 and fixed by a second screw 6), and the torsion bar is carried on them. The groove walls 83 on both sides of the transverse groove 82 are provided with corresponding Z-direction limiting holes 84 according to the center hole of the torsion bar, and are fixed by a long pin 18 passing through the Z-direction limiting hole 84 and the center hole of the torsion bar.

[0041] To facilitate fixing, a fixing plane 85 is formed on the outer wall of the groove wall 83.

[0042] More specifically, see appendix. Figure 6 The side support can be an arc-shaped support plate 1, the bottom surface of which is fixed to the base 15 (the bottom of the arc-shaped support plate has a positioning hole 104 for positioning with the first pin 14 and a threaded hole 105 for fixing with the first screw 13). A bearing hole 101 is horizontally provided at its top, and it is rotatably connected to the torsion part via a deep groove ball bearing 2. The lower part of the bearing hole 101 has a pin hole 102 and a limiting pin hole 103. The deep groove ball bearing 2 is secured in the bearing hole 101 by a retaining ring 19 to prevent it from falling out.

[0043] See appendix Figure 8 and 9 The torsion part is an asymmetrical torsion block 3. The torsion block 3 includes a plate-shaped torsion body 31. A support fixing platform 32 is provided on the torsion body 31 near the middle support side. The support fixing platform 32 fixes the end of the torsion bar, and its width is greater than or equal to the end width of the torsion bar. A cylindrical platform 33 is provided on the side of the torsion body 31 away from the support fixing platform 32, corresponding to the torsion bar. A square rotating hole 331 is located in the cylindrical platform 33 and passes through the upper part of the torsion body 31. The lower part of the torsion body 31 has a main body positioning pin hole 311 and a torsion strip hole 312.

[0044] See appendix Figure 1 The cylindrical platform 33 is inserted into the bearing hole 101, so that the end face of the torsion body 31 is in contact with the arc-shaped support plate 1. The support fixing platform 32 is vertically provided with a torsion bar end fixing hole 321, which is fixed by positioning pin 4. The main body positioning pin hole 311 at the lower part of the torsion body 31 corresponds to the pin hole 102 and is positioned by pin 9. The torsion strip hole 312 corresponds to the limit pin hole 103 and is temporarily fixed by limit pin 11 and nut 12.

[0045] Advantageously, see appendix. Figure 3 The limiting pin 11 is externally limited by the pin 10 to prevent the limiting pin 11 from rotating during the torque measurement process. The pin 9, the limiting pin 11, the nut 12 and the pin 10 are the locking parts.

[0046] This invention provides a method for using the above-described device for measuring the torsional moment of a helicopter torsion bar, comprising the following steps:

[0047] S1. Install the tension bar, fix the middle part of the tension bar to the middle support to restrict the Z-direction freedom of the tension bar; fix both ends of the tension bar to the torsion part to restrict the X-direction and Y-direction freedom of the tension bar.

[0048] S2. Measurement: First, position the locking part to ensure that the torsion angle a is 0°; insert the torque wrench into the rotating hole, and with the device in its initial state, release the locking part from its position and turn the torque wrench to rotate the torsion part; measure the maximum torque between 0°-15° and -15°-0° for the torsion bar; when measuring the torque, tighten the side support and the torsion part, keep the torsion angle unchanged, and read the value on the torque wrench.

[0049] Specifically,

[0050] In S1, the torsion bar is placed on the support fixing platform 32 and the transverse plate 5 of the torsion block. A long pin 18 is passed through the center hole of the torsion bar and fixed by the long pin nut 16 and the limiting sleeve 17 to restrict its Z-axis degree of freedom. The positioning pin 4 is inserted into the positioning holes on both sides of the torsion bar to restrict the X and Y-axis degrees of freedom.

[0051] In step S2, first insert pin 9 into the main body positioning pin hole 311 and the pin hole to fix the torsion angle at 0°. Insert the torque wrench into the rectangular rotating hole 331 to ensure the device is in its initial state. Remove pin 9 and turn the torque wrench to rotate the torsion block 3. Measure the maximum torque of the torsion bar between 0°-15° and -15°-0°. When measuring the torque, tighten nut 12 to lock the torsion block 3, keeping the angle constant, and then read the value on the torque wrench. Repeat this process multiple times to measure the torque value at various angles.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above 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 one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for measuring the torsional torque of a helicopter torsion bar, characterized in that, include: Mounting base, the upper part of which forms a support area, the support area having a central support located in the middle and side supports symmetrically arranged on both sides, the central support restricting the Z-direction degree of freedom of the tension bar; The torsion part is rotatably connected to the side support, with a rotation angle α being the torsion angle of the applied force. The torsion part fixes both ends of the tension bar, becoming an integral part with the tension bar, and restricts the X-axis and Y-axis degrees of freedom of the tension bar. The torsion part has a pre-set rotation hole for a torque wrench. And a locking part, which locks the torsion part and the side support, and the torque wrench rotates to directly measure the torque corresponding to the torsion angle.

2. The device for measuring the torsional torque of a helicopter torsion bar according to claim 1, characterized in that, The mounting base is a plate-shaped base (15), with a central hole (151) for mounting the central support and a central support fixing hole (154) in the middle; and multiple connecting holes (152) are provided on both sides corresponding to the side support.

3. The device for measuring the torsional torque of a helicopter torsion bar according to claim 2, characterized in that, The base (15) is provided with a weight reduction groove (153).

4. The device for measuring the torsional torque of a helicopter torsion bar according to claim 2, characterized in that, The central support is a columnar support base (8), with its bottom protruding part (81) fitting into the central support fixing hole (154) and its bottom plane fixed to the base (15); its top is provided with a downward recessed transverse groove (82), the transverse groove (82) carries transverse plates (5) extending to both sides and close to the two torsion parts, the transverse plates (5) are fixed to the bottom of the transverse groove (82), and the pull-torsion strip is carried on it; the groove walls (83) on both sides of the transverse groove (82) are provided with corresponding Z-direction limiting holes (84) according to the center hole of the pull-torsion strip, and are fixed by a long pin (18) passing through the Z-direction limiting hole (84) and the center hole of the pull-torsion strip.

5. The device for measuring the torsional torque of a helicopter torsion bar according to claim 4, characterized in that, A fixed plane (85) is formed on the outer wall of the groove wall (83).

6. The device for measuring the torsional torque of a helicopter torsion bar according to claim 2, characterized in that, The side support adopts an arc-shaped support plate (1), the bottom surface of which is fixed to the base (15), and a bearing hole (101) is opened in the horizontal direction at the top of which is rotatably connected to the torsion part through a deep groove ball bearing (2); the lower part of the bearing hole (101) has a pin hole (102) and a limiting pin hole (103).

7. The device for measuring the torsional torque of a helicopter torsion bar according to claim 6, characterized in that, The torsion part is an asymmetrical torsion block (3). The torsion block (3) includes a plate-shaped torsion body (31). A support fixing platform (32) is provided on the torsion body (31) near the middle support side. The support fixing platform (32) fixes the end of the torsion bar. A cylindrical platform (33) is provided on the side of the torsion body (31) away from the support fixing platform (32) corresponding to the torsion bar. A square rotating hole (331) is located in the cylindrical platform (33) and penetrates the upper part of the torsion body (31). The lower part of the torsion body (31) has a main body positioning pin hole (311) and a torsion strip hole (312).

8. The device for measuring the torsional torque of a helicopter torsion bar according to claim 7, characterized in that, The cylindrical platform (33) is inserted into the bearing hole (101), so that the end face of the torsion body (31) is in contact with the arc-shaped support plate (1). The support fixing platform (32) is vertically provided with a torsion bar end fixing hole (321), which is fixed by a positioning pin (4). The main body positioning pin hole (311) at the lower part of the torsion body (31) corresponds to the pin hole (102) and is positioned by a pin (9). The torsion strip hole (312) corresponds to the limit pin hole (103) and is temporarily fixed by a limit pin (11) and a nut (12).

9. The device for measuring the torsional torque of a helicopter torsion bar according to claim 8, characterized in that, The limiting pin (11) is externally limited by a pin (10), wherein the pin (9), the limiting pin (11), the nut (12) and the pin (10) are the locking parts.

10. A method for measuring the torsional torque of a helicopter torsion bar using the device according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Install the tension bar, fix the middle part of the tension bar to the middle support to restrict the Z-direction freedom of the tension bar; fix both ends of the tension bar to the torsion part to restrict the X-direction and Y-direction freedom of the tension bar. S2. Measurement: First, position the locking part to ensure that the torsion angle a is 0°; insert the torque wrench into the rotating hole, and with the device in its initial state, release the locking part from its position and turn the torque wrench to rotate the torsion part; measure the maximum torque between 0°-15° and -15°-0° for the torsion bar; when measuring the torque, tighten the side support and the torsion part, keep the torsion angle unchanged, and read the value on the torque wrench.

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