A rotation angle measuring device for aircraft wheel experiments

Abstract

A rotation angle measuring device for aircraft wheel experiments includes a wheel connecting seat and a measuring seat. The wheel connecting seat is fitted onto the measuring seat, allowing for rotational engagement between the two. One end face of the measuring seat has a rotation scale on its outer edge, and the other end face has an annular conical shaft groove. This conical shaft groove is formed by the inner surface of the small inner diameter section of the wheel connecting seat, the end face of the third step of the measuring seat, and the outer circumferential surface of the measuring seat after the wheel connecting seat and the measuring seat are assembled. The measuring seat is fixed to a conical shaft in the center of the experimental platform, and the wheel connecting seat is fixed to the aircraft wheel. The wheel connecting seat and the measuring seat are positioned and in contact through the circumferential stepped surface. The wheel assembly rotates circumferentially around the conical shaft as its rotation center, and the measurement is taken using a graduated dial. This invention allows for multiple angle markings with a single installation, ensuring the accuracy of the rotation angle, reducing errors, and is applicable to experiments on various tire models, demonstrating good reusability.

Description

Technical Field

[0001] This invention relates to the field of aviation mechanical technology, specifically a rotation angle measuring device for aircraft wheel experiments. Background Technology

[0002] Aircraft wheels typically consist of wheel assemblies and tires. Specialized experiments during the design process, such as tire bead pressure testing and stress-strain testing, require data collection along the wheel's circumference. These tests must be conducted on a specialized testing platform. During testing, the aircraft wheel is mounted via a conical shaft in the center of the platform. Circumferential testing of aircraft wheels requires rotating the wheel circumferentially and collecting data at different angles. To meet data collection requirements, the angle of rotation between each data acquisition point must be clearly defined. Due to the significant weight of the testing platform and the wheel itself (ranging from tens to hundreds of kilograms), wheel rotation is currently primarily achieved manually. The rotation angle is roughly marked on the tire after measurement using a protractor. Each rotation is then manually aligned with the marked angle for measurement. Therefore, wheel testing preparation is quite complex, requiring manual marking for each wheel and measurement, which is prone to human error and large angle deviations. Similar patents for measuring the rotation angle of large equipment, such as CN215711299U, describe a tower crane boom rotation angle measurement system. This system wirelessly connects an angle measuring instrument to a safety detector, with the measuring instrument located inside the boom's rotation axis to collect and display angle change data. However, such patents are not applicable to aircraft wheel testing benches, and wireless data transmission is unsuitable for the testing environment. Research indicates that there are currently no directly available commercially suitable tooling or fixtures for this purpose. Summary of the Invention

[0003] To avoid errors and deviations caused by existing manual angle measurement and marking, and to reduce the amount of manual work required for aircraft wheel testing preparation, this invention proposes a rotation angle measuring device for aircraft wheel testing.

[0004] This invention includes a wheel connecting seat and a measuring seat. The wheel connecting seat is fitted onto the measuring seat, allowing for a rotatable engagement between the two. One end face of the measuring seat has a rotational scale on its outer edge, and the other end face has an annular conical shaft groove. This conical shaft groove is formed by the wheel connecting seat and the measuring seat after assembly, on the inner surface of the small inner diameter section of the wheel connecting seat and the end face and outer circumferential surface of the third-stage step of the measuring seat.

[0005] The wheel connecting seat has a flange at one end face; the flange has strip-shaped connecting holes evenly distributed on it for connecting the wheel.

[0006] The inner diameter of the large inner diameter section of the wheel connecting seat is slightly larger than the maximum outer diameter of the measuring seat, and the inner diameter of its small inner diameter section is slightly larger than the outer diameter of the positioning section of the measuring seat.

[0007] There is an angle indicator point on the end face of the wheel connecting seat.

[0008] The outer circumferential surface of the measuring seat is a three-stage stepped surface. The first stage is the large outer diameter section that rotates with the large inner diameter section of the wheel connecting seat. The second stage is the positioning section that mates with the small inner diameter section of the wheel connecting seat. The third stage is the slotting section that forms a tapered shaft groove.

[0009] In the rotating scale, the angle between adjacent scales is 5°.

[0010] The measuring seat of the present invention is fixed on the conical shaft in the middle of the experimental platform, and the wheel connecting seat is fixed on the aircraft wheel. The wheel connecting seat and the measuring seat are positioned and in contact through the circumferential stepped surface.

[0011] When testing aircraft wheels, the wheel assembly must be mounted on a conical shaft on the test bench. After installation, the conical shaft remains stationary, and the wheel assembly rotates circumferentially around the conical shaft as its center. Wheels of different sizes are installed in conjunction with conical shafts of different diameters. During general testing, data measurement and collection are required at intervals of different rotation angles. Commonly used rotation intervals are 10 degrees, 20 degrees, and 30 degrees; intervals that are too large or too small render data collection meaningless. In this invention, the scale of the rotation angle measuring device is divided in 5-degree increments to meet measurement requirements. The hollow diameter of the scale is the maximum diameter of the conical shaft on the test bench. When measuring tires of different specifications, a bushing can be used for fixed installation. The wheel connecting seat and the measuring seat are fitted together with a stepped circumferential surface and fixedly connected to the aircraft wheel through connecting holes, rotating synchronously with the aircraft wheel.

[0012] Before measurement, align the angle indicator point of the rotation angle measuring device with the rotation scale. During measurement, the scale is fixed on the conical shaft, and the rotating wheel drives the angle indicator point to rotate synchronously. Rotate to the corresponding scale according to the required angle. A single installation can meet the needs of multiple angle markings, eliminating the need for manual marking. The scale ensures the accuracy of the rotation angle and reduces errors. Furthermore, one set of rotation angle measuring devices is suitable for testing various tire models, offering good reusability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention.

[0014] Figure 2 yes Figure 1 The right view.

[0015] Figure 3 This is an isometric schematic diagram of the fit between the present invention and the tapered shaft.

[0016] Figure 4 yes Figure 3 A sectional view.

[0017] Figure 5 This is a schematic diagram of the fit between the present invention and the tapered shaft.

[0018] Figure 6 yes Figure 5 The front view.

[0019] Figure 7 This is a schematic diagram of the measuring base.

[0020] Figure 8 This is a schematic diagram of the structure of the wheel connecting seat.

[0021] In the diagram: 1. Angle indicator point; 2. Wheel connecting seat; 3. Rotation scale; 4. Measuring seat; 5. Connecting hole; 6. Tapered shaft slot; 7. Tapered shaft. Detailed Implementation

[0022] This embodiment is a rotation angle measuring device for aircraft wheel experiments, including a scale 3 and a pointer end 5. This rotation angle measuring device is used on the aircraft wheel test bench 1 to measure the circumferential rotation angle of the aircraft wheel 3 mounted on the conical shaft 2 during experiments.

[0023] This embodiment includes a wheel connecting seat 2 and a measuring seat 4. The wheel connecting seat is fitted onto the measuring seat, and the two are rotatably engaged to obtain the rotation angle measuring device of this embodiment. The end face of the measuring end of the assembled measuring seat is flush with the end face of the wheel connecting seat. One end face of the rotation angle measuring device has a rotation scale 3, and the other end face has an annular conical shaft groove 6; this conical shaft groove is obtained after the wheel connecting seat 2 and the measuring seat 4 are assembled, that is, the inner surface of the small inner diameter section of the wheel connecting seat is formed with the end face and outer circumferential surface of the third step of the measuring seat.

[0024] The wheel connecting seat 2 is a hollow rotating body with a flange at one end face. The flange has evenly distributed strip-shaped connecting holes for connecting the wheel. The inner circumferential surface of the wheel connecting seat is a stepped surface; the inner diameter of its larger inner diameter section is slightly larger than the maximum outer diameter of the measuring seat 4, and the inner diameter of its smaller inner diameter section is slightly larger than the outer diameter of the positioning section of the measuring seat 4. An angle indicator point 1 is located on the end face of the wheel connecting seat.

[0025] The measuring seat 4 is also a hollow rotating body, and its outer circumferential surface is a three-stage stepped surface. The first stage is the large outer diameter section that rotates with the large inner diameter section of the wheel connecting seat 2. The second stage is the positioning section that mates with the small inner diameter section of the wheel connecting seat. The third stage is the slot section that forms the tapered shaft groove 6.

[0026] There is a rotation scale 3 at the outer edge of the end face of the maximum outer diameter; the included angle between adjacent scales is 5°.

[0027] In use, the wheel connecting seat 2 is fixed to the wheel hub through the strip connecting hole 5; the measuring seat 4 is fitted and fixed to the tapered shaft 7 of the test bench.

[0028] When measuring the rotation angle, the pointer of the angle indicator point 1 should be aligned with any rotation scale before measurement. This rotation scale should be recorded as 0° and used as the starting point for measurement.

[0029] Rotating the aircraft wheel causes the wheel connecting seat 2 to rotate. The measuring seat remains stationary along with the conical shaft. When the wheel connecting seat 2 rotates to the desired angle, the scale corresponding to the angle indicator point 1 represents the rotation angle of the aircraft wheel.

[0030] Using this embodiment, a single initial 0-degree positioning is sufficient to meet the measurement of different angles, facilitating the measurement of the rotation angle of different types of aircraft wheels.

Claims

1. A rotation angle measurer for an aviation wheel experiment, characterized by, It comprises a wheel connecting seat (2) and a measuring seat (4); the wheel connecting seat is sleeved on the measuring seat and is in rotary fit with the latter; the outer circumferential surface of the measuring seat (4) is a three-step surface, the first step is a large-diameter section in rotary fit with the large-diameter section of the wheel connecting seat (2), the second step is a positioning section in fit with the small-diameter section of the wheel connecting seat, and the third step is a clamping groove section forming a tapered shaft clamping groove (6); the outer edge of the end surface of the measuring seat is provided with a rotary scale (3), and the other end surface is provided with an annular tapered shaft clamping groove (6); the tapered shaft clamping groove is formed by the inner surface of the small-diameter section of the wheel connecting seat (2) and the end surface and the outer circumferential surface of the third step of the measuring seat (4) after the wheel connecting seat (2) and the measuring seat (4) are assembled; The end surface of the wheel connecting seat is provided with an angle indicating point (1); The end surface of the wheel connecting seat (2) is provided with a flange plate; the flange plate is uniformly provided with strip-shaped connecting holes for connecting the wheel; In the rotary scale (3), the included angle between adjacent scales is 5°; In use, the wheel connecting seat (2) is fixed on the wheel hub through the strip-shaped connecting holes (5); the measuring seat (4) is sleeved and fixed on the tapered shaft (7) of a test bench; when the rotary angle is measured, the pointer of the angle indicating point (1) is aligned with any rotary scale before measurement, the rotary scale is recorded as 0°, and serves as a starting point for measurement; the aviation wheel is rotated to drive the wheel connecting seat (2) to rotate; at this time, the measuring seat remains stationary with the tapered shaft; when the wheel connecting seat is rotated to a required angle, the scale corresponding to the angle indicating point is the rotary angle of the aviation wheel.

2. The rotation angle measuring device for aviation wheel experiment according to claim 1, wherein, The inner diameter of the large-diameter section of the wheel connecting seat is slightly larger than the maximum outer diameter of the measuring seat (4), and the inner diameter of the small-diameter section is slightly larger than the outer diameter of the positioning section of the measuring seat.

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