A device and method for measuring dynamic parameters of gears.

Abstract

A device and method for measuring the dynamic parameters of a gear are disclosed. The device includes a first support element for fixing the gear to be tested, a second support element for fixing a detection gear and enabling the detection gear and the gear to be tested to maintain meshing, and an image information acquisition mechanism. The image information acquisition mechanism is used to capture surface image information of the gear to be tested. A loading mechanism is connected to the second support element to apply a constant torque to the detection gear. A drive mechanism is also connected to the second support element to drive the detection gear to swing around the center of the gear to be tested. This invention is used to measure the dynamic parameters of a gear in a meshing motion state.

Description

Technical Field

[0001] This invention relates to the field of gear testing, specifically to a device and method for measuring dynamic parameters of gears. Background Technology

[0002] In gear design, especially for gears with high reliability requirements, the results of safety factor assessments based on reliability theory are almost entirely inadequate to reflect the gear's reliability level. Therefore, fatigue testing is usually required to verify the actual parameters of the gear.

[0003] Current technology for measuring gear parameters typically involves fixing the gear under test and applying a load to its teeth using a loading gear or block. However, this method yields static parameters. In practical applications, gears often mesh and move together, making the measurement of dynamic parameters during meshing crucial. Currently, however, there is a lack of devices for measuring these dynamic parameters. Summary of the Invention

[0004] The present invention aims to provide a device and method for measuring the dynamic parameters of gears, so as to measure the dynamic parameters of gears in meshing motion.

[0005] To solve the above technical problems, the specific solution adopted by the present invention is as follows: a gear dynamic parameter measuring device, comprising a first support element for fixing the gear to be tested, a second support element for fixing the detection gear and enabling the detection gear and the gear to be tested to maintain meshing, and an image information acquisition mechanism. The image information acquisition mechanism is used to capture surface image information of the gear to be tested. A loading mechanism is connected to the second support element to apply a constant torque to the detection gear. A driving mechanism is also connected to the second support element to drive the detection gear to swing around the center of the gear to be tested.

[0006] As a further optimization of the above technical solution, the first support element is a first connecting shaft, the bottom end of which is fixed on the base, and the top end of which is a splined shaft that is installed in conjunction with the gear to be tested. A mounting bracket is rotatably mounted on the first connecting shaft. The second support element is a second connecting shaft, which is rotatably mounted on the mounting bracket. The top end of which is a splined shaft that is installed in conjunction with the detection gear, and the bottom end of which is connected to the loading mechanism.

[0007] As a further optimization of the above technical solution, the drive mechanism includes a drive motor, a drive worm gear connected to the drive motor, and a drive worm wheel that works in conjunction with the drive worm gear. The drive motor is fixed on the base, the drive worm wheel is fixed on the mounting bracket, and the drive worm wheel and the gear to be tested are concentrically distributed.

[0008] As a further optimization of the above technical solution, the drive worm gear is fan-shaped.

[0009] As a further optimization of the above technical solution, the loading mechanism includes a loading motor, a loading worm gear connected to the loading motor, and a loading worm wheel that cooperates with the loading worm gear. The loading motor is mounted on a mounting frame, and the loading worm wheel is concentrically mounted on a second connecting shaft. A wireless torque signal transmitter and a torque strain gauge are mounted on the second connecting shaft.

[0010] As a further optimization of the above technical solution, a shaft coupling plate is provided between the first connecting shaft and the second connecting shaft to improve the lateral stiffness between them. The shaft coupling plate is provided with a monitoring hole for the image information acquisition mechanism to take pictures of the gear under test.

[0011] As a further optimization of the above technical solution, the mounting bracket is equipped with an adjusting slider, and the loading mechanism and the second connecting shaft are both set on the adjusting slider. The adjusting slider has a strip hole, which can control the distance between the adjusting slider and the detection gear to accommodate gears of different sizes to be tested and detection gears.

[0012] As a further optimization of the above technical solution, the image information acquisition mechanism includes a light source, a lens and a CCD camera, and the image information acquisition mechanism is fixedly installed above the gear to be tested.

[0013] A method for measuring gear dynamic parameters includes the following steps:

[0014] 1) Keep the gear under test fixed and ensure that the testing gear and the gear under test are meshed.

[0015] 2) A constant torque is applied to the detection gear via a loading mechanism.

[0016] 3) The detection gear is driven to swing around the center of the gear under test by the drive mechanism, and the surface image information of the gear under test is acquired by the image information acquisition mechanism.

[0017] As a further optimization of the above technical solution, in step 2), the torque on the detection gear is monitored by a torque strain gauge, and the torque signal is transmitted to the host computer by a wireless torque signal transmitter. The host computer controls the loading motor to adjust in a timely manner so that the torque on the detection gear is a constant torque.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention applies a constant torque to the detection gear through a loading mechanism, and drives the detection gear to swing around the center of the gear under test through a driving mechanism, thereby keeping the detection gear and the gear under test in meshing motion. During this process, the force on the end face of the gear under test is the force under dynamic conditions, which is used as the dynamic parameter of the gear. By performing digital speckle correlation (DSCM) on the image of the force deformation of the gear end face, the deformation field distribution on the surface of the gear under test is obtained, and the contact stress and bending stress distribution law of the gear under test is calculated. Attached Figure Description

[0019] Figure 1 This is a three-dimensional view of the invention from the perspective of the detection gear;

[0020] Figure 2 This is a three-dimensional view of the invention from the perspective of the gear under test;

[0021] Figure 3 This is a top view of the present invention;

[0022] Figure 4 Structural view of the connecting block and mounting bracket;

[0023] Figure 5 This is a side view of the invention from the perspective of the driving worm gear;

[0024] Figure 6 This is a cross-sectional view of the present invention;

[0025] Figure 7 This is a schematic diagram of the mechanism of the present invention installed on the test bench;

[0026] Reference numerals: 1. Image information acquisition mechanism; 2. First connecting shaft; 3. Gear to be tested; 4. Drive mechanism; 401. Drive worm gear; 402. Drive worm; 403. Drive motor; 5. Base; 6. Loading mechanism; 601. Loading worm gear; 602. Loading worm; 603. Loading motor; 7. Mounting bracket; 8. Adjusting slider; 801. Upper slider; 802. Lower slider; 803. Connecting block; 9. Detection gear; 10. Shaft connecting plate; 11. Second connecting shaft; 12. Mounting plate; 13. Column; 14. Positioning bolt; 15. Elongated hole; 16. Wireless torque signal transmitter; 17. Torque strain gauge; 18. First bearing; 19. Second bearing; 20. Monitoring hole; 21. Shaft seat; 22. Test bench; 23. Mounting hole. Detailed Implementation

[0027] like Figure 1 , Figure 2As shown, this invention is a device for measuring the dynamic parameters of a gear, comprising a first support element, a second support element, and an image information acquisition mechanism 1. The first support element is used to fix the gear 3 to be tested, and the second support element is used to fix the detection gear 9 and enable the detection gear 9 and the gear 3 to be tested to remain meshed. A loading mechanism 6 for applying a constant torque to the detection gear 9 is connected to the second support element, and a driving mechanism 4 for driving the detection gear 9 to swing around the center of the gear 3 to be tested is also connected to the second support element. The image information acquisition mechanism 1 corresponds to the meshing point of the gear 3 to be tested and the detection gear 9 to capture surface image information of the gear 3 to be tested. The surface image information is the image of the gear end face under force deformation. By performing digital speckle correlation (DSCM) on the surface image information, the deformation field distribution of the surface of the gear under test is obtained, and the contact stress and bending stress distribution law of the gear under test is calculated.

[0028] Specifically, the first supporting element is a first connecting shaft 2, which is vertically fixed on the base 5. The first connecting shaft 2 includes a lower enlarged part and an upper splined shaft. The bottom end of the enlarged part is fixed on the base 5. The splined shaft is used for mounting the gear 3 to be tested, and the rotation of the gear 3 to be tested can be restricted by the splined shaft. The enlarged part is provided below the first connecting shaft 2, and a mounting bracket 7 is rotatably mounted on the first connecting shaft 2 above the enlarged part. The mounting bracket 7 is a plate-type mounting bracket 7, and the plate surface of the mounting bracket 7 is parallel to the gear 3 to be tested. The rod of the first connecting shaft 2 and the mounting bracket 7 are rotatably connected by a first bearing 18.

[0029] The second support element is a second connecting shaft 11, which is mounted on the mounting bracket 7. The upper end of the second connecting shaft 11 is a splined shaft that mates with the detection gear 9, and the lower end of the second connecting shaft 11 is connected to the loading mechanism 6, with the bottom end of the second connecting shaft 11 suspended. The loading mechanism 6 includes a loading motor 603, a loading worm 602 connected to the loading motor 603, and a loading worm wheel 601 that mates with the loading worm 602. Both the loading motor 603 and the loading worm 602 are mounted on the mounting bracket 7. The loading worm wheel 601 is concentrically distributed with the detection gear 9 and mounted on the second connecting shaft 11. The loading motor 603 drives the loading worm 602 to rotate, thereby causing the loading worm wheel 601 to apply a certain torque to the detection gear 9. A wireless torque signal transmitter 16 and a torque strain gauge 17 are mounted on the second connecting shaft 11. The torque on the detection gear 9 is monitored by the torque strain gauge 17, and the torque signal is transmitted to the host computer through the wireless torque signal transmitter 16. The host computer controls the loading motor 603 to adjust in a timely manner so that the torque on the detection gear 9 is constant.

[0030] Since the second connecting shaft 11 and the loading mechanism 6 are both mounted on the mounting frame 7, and the mounting frame 7 is rotatably mounted on the first connecting shaft 2, setting the lower part of the first connecting shaft 2 as an enlarged part can enhance the support effect of the first connecting shaft 2 and improve the stability of the device.

[0031] The drive mechanism 4 includes a drive motor 403, a drive worm 402 connected to the drive motor 403, and a drive worm wheel 401 that works in conjunction with the drive worm 402. Both the drive motor 403 and the drive worm 402 are fixed to the base 5, and the drive worm wheel 401 is fixed to the mounting bracket 7, with the drive worm wheel 401 and the gear 3 to be tested being concentrically distributed. The drive motor 403 drives the drive worm 402 to rotate, which in turn drives the drive worm wheel 401 to move. By adjusting the current direction of the drive motor 403, the forward and reverse rotation of the drive motor 403 controls the reciprocating motion of the drive worm wheel 401. The mounting bracket 7 and the detection gear 9 mounted on it can both reciprocate under the drive of the drive worm wheel 401, i.e., generate a swinging motion around the first connecting shaft 2.

[0032] like Figure 5 As shown, the drive worm gear 401 is fan-shaped. Since the rotation amplitude of the drive worm gear 401 is very small during use, setting the drive worm gear 401 to a fan shape can meet the test requirements. The fan shape setting can also save the installation space on the lower plate of the mounting bracket 7 and avoid the expansion part below the first connecting shaft 2 from interfering with the installation of the drive worm gear 401.

[0033] A shaft coupling plate 10 is provided between the first connecting shaft 2 and the second connecting shaft 11 to improve the lateral stiffness between them. The shaft coupling plate 10 is a strip plate, and its surface is parallel to the detection gear 9 and the gear 3 to be tested. A monitoring hole 20 is provided on the shaft coupling plate 10, which is located directly below the image information acquisition mechanism 1, so that the image information acquisition mechanism 1 can take pictures of the gear 3 to be tested.

[0034] like Figure 2 , Figure 3 , Figure 4As shown, to accommodate gears 3 or 9 of different sizes, an adjusting slider 8 is provided on the mounting frame 7. The adjusting slider 8 includes a connecting block 803, an upper slider 801 disposed on the upper surface of the connecting block 803, and a lower slider 802 disposed on the lower surface of the connecting block 803. Both the upper slider 801 and the lower slider 802 are fixed to the connecting block 803 by fastening bolts, and are distributed in parallel. When the adjusting slider 8 is mounted on the mounting frame 7, the upper slider 801 is located on the upper plate surface of the mounting frame 7, and the lower slider 802 is located on the lower plate surface of the mounting frame 7. The mounting frame 7 has a rectangular mounting hole 23 to accommodate the connecting block 803, and the connecting block 803 can slide horizontally along the mounting hole 23 to adjust the distance between the second connecting shaft 11 and the first connecting shaft 2.

[0035] like Figure 6 As shown, the second connecting shaft 11 is rotatably mounted on the connecting block 803 via the second bearing 19. The upper slider 801 includes two opposing clamping plates 801-1, both of which are fixed to the connecting block 803 by bolts. A bearing seat 21 is bolted to the upper surface of the connecting block 803. The bearing seat 21 is sleeved on the outside of the second connecting shaft 11 and rotatably connected to the second connecting shaft 11. The outer edge of the bearing seat 21 is in concave-convex fit with the inner edge of the clamping plate 801-1. Moving the upper slider 801 in the horizontal direction can drive the connecting block 803 to move within the mounting hole 23.

[0036] The loading motor 603 and loading worm gear 601 of the loading mechanism 6 are both fixed on the lower surface of the lower slider 802. When the upper slider 801 drives the connecting block 803 to move, the lower slider 802 and the loading motor 603 and loading worm gear 601 installed on it move together with the connecting block 803.

[0037] like Figure 3 As shown, the upper slider 801 and lower slider 802 have corresponding elongated holes 15, and the mounting bracket 7 has threaded holes. When the upper slider 801 and lower slider 802 are fixed on the mounting bracket 7, the elongated holes 15 correspond to the threaded holes. After the positioning bolts 14 pass through the elongated holes 15 of the upper slider 801, the threaded holes, and the elongated holes of the lower slider 802 in sequence, the adjusting slider 8 is fixed on the mounting bracket 7. When it is necessary to replace the gear 3 or the detection gear 9 of different sizes, the positioning bolts 14 are loosened, so that the adjusting slider 8 slides relative to the mounting bracket 7 along the elongated holes 15 on it to adjust the distance between the second connecting shaft 11 and the first connecting shaft 2. After the distance is adjusted, the long bolts are tightened to fix the adjusting slider 8 on the mounting bracket 7.

[0038] like Figure 7As shown, the image acquisition mechanism 1 includes a light source, a lens, and a CCD camera, and is fixed above the gear 3 under test. A column 13 is provided on one side of the base 5. Both the base 5 and the column 13 are mounted on the test bench 22. A mounting plate 12 is horizontally mounted on the column 13, and the image acquisition mechanism 1 is mounted on the mounting plate 12 to capture images of different gear meshing positions. The image acquisition mechanism 1 uses an LED light source, which illuminates the gear 3 under test, capturing surface image information of the gear 3.

[0039] A method for measuring gear dynamic parameters includes the following steps:

[0040] 1) Keep the gear under test 3 fixed and ensure that the testing gear 9 and the gear under test 3 are meshed;

[0041] 1.1 Install the gear 3 to be tested on the first connecting shaft 2;

[0042] 1.2 Adjust the relative distance between the second connecting shaft 11 and the first connecting shaft 2 by adjusting the slider 8, so that the detection gear 9 and the gear to be tested 3 are kept meshed;

[0043] 2) A constant torque is applied to the detection gear 9 via the loading mechanism 6.

[0044] 2.1 The torque on the detection gear 9 is monitored by the torque strain gauge 17, and the torque signal is transmitted to the host computer through the wireless torque signal transmitter 16. The host computer controls the loading motor 603 to adjust in a timely manner so that the torque on the detection gear 9 is constant.

[0045] 3) The detection gear 9 is driven by the drive mechanism 4 to swing around the center of the gear 3 under test, and the surface image information of the gear 3 under test is acquired by the image information acquisition mechanism 1.

[0046] 3.1 The drive motor 403 drives the drive worm 402 to rotate forward and reverse, which in turn drives the drive worm wheel 401 to rotate. As a result, the mounting bracket 7 drives the detection gear 9 to rotate around the first connecting shaft 2 at the center of the gear 3 to be tested.

[0047] Finally, digital speckle correlation (DSCM) is performed on the surface image information of the gear 3 under test to obtain the deformation field distribution on the surface of the gear 3 under test, and the distribution law of contact stress and bending stress of the gear 3 under test is calculated.

Claims

1. A device for measuring the dynamic parameters of a gear, characterized in that, It includes a first support element for fixing the gear under test (3), a second support element for fixing the detection gear (9) and enabling the detection gear (9) and the gear under test (3) to maintain meshing, and an image information acquisition mechanism (1). The image information acquisition mechanism (1) is used to capture surface image information of the gear under test (3). A loading mechanism (6) is connected to the second support element to apply a constant torque to the detection gear (9). A drive mechanism (4) is also connected to the second support element to drive the detection gear (9) to swing around the center of the gear under test (3). The first support element is the first connecting shaft (2), the bottom end of the first connecting shaft (2) is fixed on the base (5), the top end of the first connecting shaft (2) is a spline shaft that is installed in conjunction with the gear (3) to be tested, and a mounting bracket (7) is rotatably mounted on the first connecting shaft (2); the second support element is the second connecting shaft (11), the second connecting shaft (11) is rotatably mounted on the mounting bracket (7), the top end of the second connecting shaft (11) is a spline shaft that is installed in conjunction with the detection gear (9), and the bottom end of the second connecting shaft (11) is connected to the loading mechanism (6); The drive mechanism (4) includes a drive motor (403), a drive worm (402) connected to the drive motor (403) and a drive worm wheel (401) used in conjunction with the drive worm (402). The drive motor (403) is fixed on the base (5), and the drive worm wheel (401) is fixed on the mounting bracket (7). The drive worm wheel (401) and the gear to be tested (3) are concentrically distributed. The loading mechanism (6) includes a loading motor (603), a loading worm (602) connected to the loading motor (603) and a loading worm wheel (601) cooperating with the loading worm (602). The loading motor (603) is mounted on the mounting bracket (7), and the loading worm wheel (601) is concentrically mounted on the second connecting shaft (11). The second connecting shaft (11) is equipped with a wireless torque signal transmitter (16) and a torque strain gauge (17).

2. The gear dynamic parameter measuring device according to claim 1, characterized in that, The drive worm gear (401) is sector-shaped.

3. The gear dynamic parameter measuring device according to claim 1, characterized in that, A shaft connecting plate (10) is provided between the first connecting shaft (2) and the second connecting shaft (11) to improve the lateral stiffness between them. A monitoring hole (20) is provided on the shaft connecting plate (10) so that the image information acquisition mechanism (1) can take pictures of the gear (3) under test.

4. The gear dynamic parameter measuring device according to claim 1, characterized in that, The mounting bracket (7) is provided with an adjusting slider (8), the loading mechanism (6) and the second connecting shaft (11) are both provided on the adjusting slider (8), and the adjusting slider (8) is provided with an elongated hole (15). The distance between the adjusting slider (8) and the detection gear (9) can be controlled through the elongated hole (15) to accommodate different sizes of the gear to be tested (3) and the detection gear (9).

5. The gear dynamic parameter measuring device according to claim 1, characterized in that, The image information acquisition mechanism (1) includes a light source, a lens and a CCD camera. The image information acquisition mechanism (1) is fixedly set above the gear (3) to be tested.

6. A method for measuring gear dynamic parameters, using the gear dynamic parameter measuring device as described in claim 1, characterized in that, Includes the following steps: 1) Keep the gear under test (3) fixed and ensure that the testing gear (9) and the gear under test (3) are meshed. 2) A constant torque is applied to the detection gear (9) by the loading mechanism (6). 3) Drive the detection gear (9) to swing around the center of the gear (3) under test by the drive mechanism (4), and collect the surface image information of the gear (3) under test by the image information acquisition mechanism (1).

7. The method for measuring gear dynamic parameters according to claim 6, characterized in that, In step 2), the torque on the detection gear (9) is monitored by the torque strain gauge (17), and the torque signal is transmitted to the host computer by the wireless torque signal transmitter (16). The host computer controls the loading motor (603) to adjust in time so that the torque on the detection gear (9) is constant.

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