A kind of transmission shaft torque test retrofit structure

Abstract

The application belongs to the technical field of aero-engines, and particularly relates to a transmission shaft torque test modification structure, which comprises a fixed layer arranged on a shaft body of an original transmission shaft, a first functional structure connected with the original transmission shaft through the fixed layer, the torsional strength of the first functional structure being less than that of the original transmission shaft, and a second functional structure arranged on the first functional structure, the torsional strength of the second functional structure being less than that of the first functional structure, wherein the second functional structure constitutes a strain concentration area for mounting a strain gauge to measure torque, and a transmission shaft torque test modification method is used to realize the increase of the sensitivity of a strain measurement area on the premise of ensuring the rigidity and strength of the original transmission shaft unchanged.

Description

Technical Field

[0001] This application belongs to the field of aero-engine technology, and specifically relates to a modified structure for testing the torque of a transmission shaft. Background Technology

[0002] A range of industrial rotating machinery, including aero-engines, are largely composed of transmission mechanisms. Understanding the mechanical torque on the drive shaft helps verify the engine's true power output, optimize fuel efficiency, achieve safety monitoring and early warning, and ultimately save time and costs. Currently, strain gauge measurement is commonly used to measure drive shaft torque. Four strain gauges are installed along the principal stress direction on a straight section of the shaft surface being measured. Adjacent strain gauges are installed perpendicularly to each other to form a Wheatstone bridge, thus reducing the influence of temperature, bending moment, and other factors. A typical drive shaft structure is shown below. Figure 1 As shown, the installation scheme for the torque testing strain gauge is as follows: Figure 2 As shown.

[0003] Because transmission mechanisms operate in high-temperature, high-speed environments, drive shafts are typically designed with high rigidity to ensure safe and reliable operation. This results in insufficient strain on their surfaces, making torque measurement impossible. Current solutions address this issue by thinning the section of the drive shaft being measured. This reduces local rigidity, increasing strain and thus enabling torque measurement. The test modification scheme is as follows... Figure 3 As shown. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a modified structure for testing the torque of a drive shaft, comprising:

[0005] A fixed layer is installed on the shaft body of the original drive shaft;

[0006] The first functional structure is connected to the original drive shaft through the fixing layer, and the torsional strength of the first functional structure is less than the torsional strength of the original drive shaft.

[0007] A second functional structure is disposed on the first functional structure, wherein the torsional strength of the second functional structure is less than that of the first functional structure.

[0008] The second functional structure forms a strain concentration zone, which is used to install strain gauges to measure torque.

[0009] Preferably, the axial length of the second functional structure is less than the axial length of the first functional structure.

[0010] Preferably, the first functional structure is a sleeve-shaped, sheet-shaped, or cage-like structure.

[0011] Preferably, the outer diameter of the second functional structure is larger than the outer diameter of the original drive shaft.

[0012] Preferably, the radial thickness of the second functional structure is less than the radial thickness of the first functional structure.

[0013] Preferably, the second functional structure is made of a material with an elastic modulus lower than that of the original drive shaft.

[0014] Preferably, the second functional structure is configured to break preferentially when subjected to a torque exceeding a preset value.

[0015] Preferably, it includes a plurality of first functional structures and a plurality of second functional structures, wherein the plurality of first functional structures and the plurality of second functional structures are arranged in circumferential sections along the original drive shaft.

[0016] A modified method for testing drive shaft torque includes the following steps:

[0017] A fixing layer is installed on the original drive shaft body;

[0018] The first functional structure is connected to the original drive shaft through the fixing layer;

[0019] A second functional structure is configured on the first functional structure;

[0020] Wherein, the torsional strength of the first functional structure is less than the torsional strength of the original transmission shaft, and the torsional strength of the second functional structure is less than the torsional strength of the first functional structure;

[0021] Strain gauges are installed on the second functional structure.

[0022] Preferably, the strain sensitivity is adjusted by adjusting at least one parameter of the outer diameter, axial length, radial thickness, and material of the second functional structure.

[0023] The modified method for testing the torque of the transmission shaft of the present invention increases the sensitivity of the strain measurement zone while ensuring that the stiffness and strength of the original transmission shaft remain unchanged.

[0024] 2. Achieve dual guarantees of high torsional strength and high sensitivity in torque strain testing.

[0025] 3. At the same time, the new structure will break first when subjected to excessive torque, which will protect the original drive shaft and achieve both accuracy and safety in torque measurement. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a typical drive shaft structure;

[0027] Figure 2 This is a schematic diagram of the installation scheme for the torque testing strain gauge;

[0028] Figure 3 This is a schematic diagram of the existing test modification scheme;

[0029] Figure 4 This is a schematic diagram of the modified structure for testing the torque of the drive shaft;

[0030] Figure 5 This is a simplified schematic diagram of the transmission shaft testing and modification structure. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0032] The present invention proposes a modified structure for testing the torque of a drive shaft, as follows: Figure 4 As shown, it mainly consists of a fixing layer 1, a first functional structure 2, a second functional structure 3, a first lead hole 4, a second lead hole 5, and the original drive shaft 6.

[0033] The original drive shaft 6 retains its original function while maintaining the same rigidity and strength (slightly enhanced) after modification.

[0034] The torsional strength of the second functional structure 3 is much lower than that of the other parts of the first functional structure 2 except for the second functional structure 3.

[0035] The torsional strength of the first functional structure 2 and 3 is much less than that of the original drive shaft 6.

[0036] The fixed connection layer 1 is used to connect the first functional structure 2 to the root of both ends of the original drive shaft 6, so as to realize the torsional transmission function of the first functional structure 2 and the original drive shaft 6 at the fixed connection position.

[0037] The first functional structure 2 is a sleeve structure or other similar sheet-like or cage-like structure, which is connected to the root of both ends of the original drive shaft 6 to provide a carrier for the second functional structure 3 and realize the torsional transmission between the second functional structure 3 and the original drive shaft 6.

[0038] The wall thickness of the first functional structure 2 should be minimized so that its torsional strength is less than that of the original drive shaft 6. This ensures that it has virtually no impact on the relative deformation at both ends of the original drive shaft.

[0039] The second functional structure 3 is formed by thinning a small section of the first functional structure 2 along its axial direction, such that the torsional strength of the second functional structure 3 is less than that of the first functional structure 2.

[0040] Under the above conditions, the torsional strength of the modified structure is much lower than that of the original drive shaft 6.

[0041] Furthermore, the torsional deformation at both ends of the original drive shaft 6 at the fixed layer 1 can be transmitted to both ends of the second functional structure 3 in an approximately 1:1 ratio.

[0042] Furthermore, the second functional structure 3 is constructed as a strain concentration region. The axial length of the second functional structure 3 is set to be much smaller than the axial length of the first functional structure 2, thereby increasing the circumferential strain in this region.

[0043] Furthermore, when the torsional deformation at both ends of the second functional structure 3 follows the torsional deformation at both ends of the original drive shaft 6, the outer diameter of the second functional structure 3 is larger than that of the original drive shaft 6, which further amplifies the relative circumferential deformation at both ends of the second functional structure 3, thereby further increasing the effect of circumferential strain in the corresponding area.

[0044] The second functional structure 3 can also use other metal materials with a smaller elastic modulus to replace the raw materials, so as to further increase the strain sensitivity.

[0045] Furthermore, relative to the original drive shaft 6, the outer diameter, axial length, radial thickness, and material of the second functional structure 3 are adjusted to achieve the adjustment of the circumferential strain range or strain sensitivity of the second functional structure 3 corresponding to the original drive shaft 6, and to make the circumferential strain of the second functional structure 3 within the elastic range.

[0046] Furthermore, the second functional structure 3 is used as a torque limiting or alarm device, and it will break and alarm first when subjected to excessive torque, thus protecting the original drive shaft from damage.

[0047] Simplified schematic diagram of the modified drive shaft torque test structure is shown below. Figure 5 As shown.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0049] Taking four points A, B, C, and D on the same plane passing through the axis as reference points, the right side is the left view, and the bottom is a schematic diagram uniformly unfolded according to the central angle. When the drive shaft is twisted in the direction shown in the figure, if ACDB is set to have equal radial thickness, then after the torsional deformation, the ACDB torsion angle will turn to position A1C1D1B1, and C and D will change to positions C1 and D1, which are on the same torsion angle line as A1 and B1. If the radial thickness of segment CD is much smaller than the radial thickness of segments AC and DB, then after the torsional deformation, ACDB will turn to position A1C2D2B1, so that the torsion angle deformation positions A1 and B1 generated at positions A and B at both ends of the original drive shaft are transmitted to positions C and D in an approximately 1:1 ratio, that is, the torsion angle positions C2 and D2 follow the torsion angle deformation positions A1 and B1 respectively.

[0050] (2) The axial length of CD is less than the axial length of AB, and the outer diameter of CD segment is less than the outer diameter of the original drive shaft 6 corresponding to AB segment.

[0051] In summary, the torsional strength after modification is slightly greater than that before modification; the circumferential strain of the CD section is much greater than the circumferential strain of the original drive shaft 6 surface.

[0052] Furthermore, different fan-shaped, sheet-like, or cage-like modified structures are adopted to realize the second functional structure 3 and the first functional structure 2, which are fixedly connected in sections along the original drive shaft 6 in the circumferential direction, so as to realize multi-sensitivity circumferential strain measurement of the original drive shaft 6 under the same torque.

[0053] Furthermore, the above technologies are applied to a new torsion shaft design, achieving a dual guarantee of high torsional strength and high sensitivity in torque strain testing.

Claims

1. A modified structure for testing the torque of a drive shaft, characterized in that, include: A fixed layer (1) is provided on the shaft of the original drive shaft (6); The first functional structure (2) is connected to the original drive shaft (6) through the fixed layer (1), and the torsional strength of the first functional structure (2) is less than that of the original drive shaft (6). The second functional structure (3) is disposed on the first functional structure (2), and the torsional strength of the second functional structure (3) is less than that of the first functional structure (2). The second functional structure (3) forms a strain concentration zone for mounting strain gauges to measure torque. The radial thickness of the second functional structure (3) is smaller than the radial thickness of the first functional structure (2); The second functional structure (3) is configured to break preferentially when subjected to a torque exceeding a preset value.

2. The modified transmission shaft torque testing structure as described in claim 1, characterized in that, The axial length of the second functional structure (3) is less than the axial length of the first functional structure (2).

3. The modified transmission shaft torque testing structure as described in claim 1, characterized in that, The first functional structure (2) is a sleeve-shaped, sheet-shaped or cage-shaped structure.

4. The modified transmission shaft torque testing structure as described in claim 1, characterized in that, The outer diameter of the second functional structure (3) is larger than the outer diameter of the original transmission shaft (6).

5. The modified transmission shaft torque testing structure as described in claim 1, characterized in that, The second functional structure (3) is made of a material with an elastic modulus less than that of the original drive shaft (6).

6. The modified transmission shaft torque testing structure as described in claim 1, characterized in that, It includes multiple first functional structures (2) and multiple second functional structures (3), which are arranged in circumferential sections along the original drive shaft (6).

7. A method for modifying a driveshaft torque test, employing the driveshaft torque test modification structure as described in any one of claims 1-6, characterized in that, Includes the following steps: A fixing layer (1) is provided on the shaft of the original drive shaft (6); The first functional structure (2) is connected to the original drive shaft (6) through the fixing layer (1); A second functional structure (3) is provided on the first functional structure (2); Among them, the torsional strength of the first functional structure (2) is less than the torsional strength of the original transmission shaft (6), and the torsional strength of the second functional structure (3) is less than the torsional strength of the first functional structure (2). Strain gauges are installed on the second functional structure (3).

8. The modified method for testing the torque of a drive shaft according to claim 7, characterized in that, The strain sensitivity is adjusted by adjusting at least one parameter of the outer diameter, axial length, radial thickness, and material of the second functional structure (3).

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