High-speed electrically-driven spline pair fretting wear experiment platform based on six-axis parallel mechanism

Abstract

The invention relates to a high-speed electrically-driven spline pair fretting wear experiment platform based on a six-axis parallel mechanism, and belongs to the technical field of fretting tribology in mechanical engineering. The device comprises a base, a height adjusting cushion block, a motor driving module, a coupler I, an inner spline shaft sleeve, an outer spline shaft, a six-axis parallel adjusting module, a laser measuring extension shaft, a laser measuring module, a universal coupler, a load testing module, a computer, a data acquisition device and the like. The spline pair fretting wear experimental platform is used for solving the problem that the radial misalignment amount, the angle misalignment amount and the axial floating amount of an existing spline pair fretting wear experimental platform cannot be changed and monitored in real time, and real-time adjustment can be carried out through six-axis conversion of a high-precision six-axis parallel mechanism. The device can be used for fretting wear tests of different working conditions and materials.

Description

Technical Field

[0001] The invention relates to a high-speed electric-driven spline pair fretting wear experimental platform based on a six-axis parallel mechanism, belonging to the technical field of fretting tribology in mechanical engineering. Background Art

[0002] As a key component in mechanical transmission, the spline pair's design and structure give it unique advantages: exceptional load-bearing capacity, excellent alignment, and good guidance. These advantages make it an irreplaceable role in various transmission systems. However, due to factors such as manufacturing errors, assembly errors, and overturning moments, spline pairs can experience radial misalignment, angular misalignment, and axial float. Fretting wear refers to the wear caused by the relative motion of two contacting surfaces at small amplitudes. In spline pairs, fretting wear caused by radial and angular misalignment can gradually increase the clearance between the key teeth and change the key tooth shape, thereby affecting transmission efficiency and accuracy. In the actual use of high-speed motors as hub-drive motors, spline pairs often fail due to fretting wear caused by misalignment. This causes severe wear to both the motor and reducer splines, and some reducer spline ends wear unevenly. Spline pair failure can significantly shorten the equipment life.

[0003] During the actual use of high-speed motors as in-wheel drive motors, the forces and loads on the spline pairs change in real time due to changes in load and road conditions. This also causes real-time variations in radial misalignment, angular misalignment, and axial float. Establishing a test platform for testing spline pair fretting wear and simulating micro-wear on specimens is complex. Existing solutions, which rely on mechanical adjustments, can only adjust fixed amounts. This approach is relatively ideal for simulating the actual use of high-speed motors as in-wheel drive motors compared to actual conditions.

[0004] To overcome the above problems, the present invention discloses a high-speed electric-driven spline pair micro-wear experimental platform based on a six-axis parallel mechanism, which approximates the real-time changes of the spline pair in actual use as quantitative changes over a period of time. The radial misalignment, angular misalignment and axial floating amount are adjusted in real time through the six-axis transformation of the high-precision six-axis parallel mechanism to simulate the micro-wear of the spline pair caused by different road conditions and loads during the actual use of the high-speed motor as a hub drive motor, and then evaluates the wear condition of the spline pair. Summary of the Invention

[0005] The present invention aims to provide a high-speed, electrically driven, spline pair fretting wear test platform based on a six-axis parallel mechanism. This platform addresses the problem of existing spline pair fretting wear test platforms being unable to monitor and adjust radial misalignment, angular misalignment, and axial float in real time. By enabling real-time adjustment through the high-precision six-axis parallel mechanism's six-axis transformation, the device is capable of conducting fretting wear tests under diverse operating conditions and on a variety of materials.

[0006] To achieve the above-mentioned purpose and principle, the technical solution of the present invention is as follows:

[0007] A high-speed electric-driven spline pair micro-wear experimental platform based on a six-axis parallel mechanism includes a base, a height adjustment pad, a motor drive module, a coupling I, an inner spline sleeve, an outer spline shaft, a six-axis parallel adjustment module, a laser measurement extension shaft, a laser measurement module, a universal coupling, a load testing module, a computer, and a data acquisition device; the motor drive module includes a drive motor and a drive motor frame; the six-axis parallel adjustment module includes a six-axis adjustment platform, a front bearing fixing seat, a rear bearing fixing seat, a rear bearing fixing seat, a front bearing end cover, a lip seal ring, a deep groove ball bearing I, a deep groove ball bearing II, and a rear bearing end cover; the laser measurement module includes a laser measurement module fixing base, a laser sensor mounting seat, a laser sensor, an axial fine-tuning slide, a radial fine-tuning slide, a radial coarse-tuning slide, upper and lower connecting seats of the laser measurement module, a height fine-tuning slide, and a height coarse-tuning slide; the load testing module includes a load testing module fixing base, a torque sensor fixing seat, a torque sensor, a coupling II, and a load motor.

[0008] The six-axis parallel adjustment module and the laser measurement module are fixed on the base, the motor drive module is connected to the base through the height adjustment pad, the load testing module is connected to the base through the height adjustment pad, the motor shaft of the motor drive module is connected to the coupling I, the coupling I is connected to the inner spline sleeve, the inner spline sleeve is connected to the outer spline shaft, the outer spline shaft is connected to the six-axis parallel adjustment module, the outer spline shaft is fixed to the laser measurement extension shaft, and the laser measurement extension shaft is connected to the load testing module through the universal coupling.

[0009] The drive motor is fixed on the drive motor seat, and the drive motor seat is fixed to the base by bolts; the six-axis adjustment platform is fixed on the base, the front bearing fixing seat is connected to the six-axis adjustment platform, the rear bearing mounting seat is connected to the base, the rear bearing fixing seat is installed on the rear bearing mounting seat, the front bearing end cover is connected to the front bearing fixing seat, the lip seal is connected to the front bearing end cover, the deep groove ball bearing I is connected to the front bearing end cover, the rear bearing end cover is connected to the rear bearing fixing seat, and the deep groove ball bearing II is connected to the rear bearing end cover; the laser measurement module fixed base is connected to the base, the height coarse adjustment slide is connected to the laser measurement module fixed base, and the height fine adjustment The slide is connected to the height coarse adjustment slide, the upper and lower connecting seats of the laser measurement module are connected to the height fine adjustment slide, the radial coarse adjustment slide is connected to the upper and lower connecting seats of the laser measurement module, the radial fine adjustment slide is connected to the radial coarse adjustment slide, the axial fine adjustment slide is connected to the radial fine adjustment slide, the laser sensor mounting seat is mounted on the axial fine adjustment slide, and the laser sensor is mounted on the laser sensor mounting seat; the load test module fixed base is fixed to the base plate, the torque sensor fixing seat is fixed to the load test module fixed base, the torque sensor is connected to coupling II, the coupling II is connected to the motor shaft of the load motor, and the load motor is fixed to the load test module fixed base. A high-speed electric drive spline pair micro-wear test platform based on a six-axis parallel mechanism can control torque, radial misalignment, angular misalignment and axial float through the data acquisition device and the computer.

[0010] The above-mentioned high-speed electric-driven spline pair micro-motion wear experimental platform based on a six-axis parallel mechanism has a base that is a T-slot plate, and the axial spacing of each component can be adjusted, which is convenient for installation and adjustment.

[0011] In the above-mentioned high-speed electric-driven spline pair micro-wear experimental platform based on a six-axis parallel mechanism, the output speed range of the driving motor in the motor driving module is a first preset range, and the rated torque is a first preset value.

[0012] In the above-mentioned high-speed electric-driven spline pair micro-wear experimental platform based on the six-axis parallel mechanism, the first preset range of the motor drive module is 0-12000 r / min, and the first preset value is 500 N·m.

[0013] In the aforementioned high-speed electric-driven spline pair fretting wear test platform based on a six-axis parallel mechanism, the drive motor in the motor drive module is fixed to the drive motor frame by bolts through waist-shaped holes, and the radial position is adjusted through the waist-shaped holes. The drive motor frame is fixed to the base by bolts through waist-shaped holes, and the radial position is adjusted through the waist-shaped holes.

[0014] In the above-mentioned high-speed electric-driven spline pair micro-wear experimental platform based on a six-axis parallel mechanism, the motor drive module and the load test module are adjusted in height by a height adjustment pad.

[0015] The above-mentioned high-speed electric drive spline pair micro-wear experimental platform based on the six-axis parallel mechanism, the inner spline sleeve and the outer spline shaft form a spline pair, and the outer spline shaft is supported by the deep groove ball bearing I and deep groove ball bearing II in the six-axis parallel adjustment module.

[0016] The six-axis parallel adjustment module in the high-speed, electrically driven, spline pair micro-wear test platform described above adjusts the six degrees of freedom of the platform's top surface by adjusting the extension length of six high-precision, high-rigidity electric push rods. The top surface of the six-axis parallel platform is perpendicularly fixed to the front bearing mount. By converting the center coordinates of the six-axis parallel platform with those of the front bearing mount, radial misalignment, angular misalignment, and axial float can be adjusted.

[0017] The above-mentioned high-speed electric-driven spline pair micro-wear experimental platform based on a six-axis parallel mechanism, the electric push rod of the six-axis parallel platform in the six-axis parallel adjustment module has self-locking performance, the resolution reaches the second preset value, the displacement repeatability reaches the second preset range, the angle repeatability reaches the third preset range, the displacement stroke reaches the fourth preset range, the rotation range reaches the fifth preset range, and the minimum displacement in the X, Y and Z directions reaches the third preset value.

[0018] The above-mentioned high-speed electric-driven spline pair micro-wear experimental platform based on a six-axis parallel mechanism, the second preset value in the six-axis parallel adjustment module is 8 nm, the second preset range is ±0.1 μm, the third preset range is ±2 μrad, the fourth preset range is ±27.5 mm, the fifth preset range is ±11.5°, and the third preset value is 0.25 μm.

[0019] In the above-mentioned high-speed electric-driven spline pair micro-wear experimental platform based on a six-axis parallel mechanism, the inner diameter and outer diameter of the deep groove ball bearing I in the six-axis parallel adjustment module are both larger than those of the deep groove ball bearing II.

[0020] In the above-mentioned high-speed electric-driven spline pair micro-wear experimental platform based on a six-axis parallel mechanism, the reference distance and measurement range of the laser sensor in the laser measurement module reach the sixth preset range, and the repeatability is the fourth preset value.

[0021] In the above-mentioned high-speed electric-driven spline pair fretting wear experimental platform based on a six-axis parallel mechanism, the sixth preset range in the laser measurement module is 20 ± 3 mm, and the fourth preset value is 0.02 μm.

[0022] The above-mentioned high-speed electric-driven spline pair micro-wear experimental platform based on a six-axis parallel mechanism, the laser sensor in the laser measurement module adjusts the sensor height position through a height coarse adjustment slide and a height fine adjustment slide, and adjusts the sensor radial distance through a radial fine adjustment slide and a radial coarse adjustment slide.

[0023] In the above-mentioned high-speed electric-driven spline pair fretting wear experimental platform based on a six-axis parallel mechanism, the laser sensor in the laser measurement module monitors the radial misalignment and angular misalignment by monitoring the laser measurement extension shaft.

[0024] The above-mentioned high-speed electric drive spline pair micro-wear experimental platform based on a six-axis parallel mechanism, the load motor in the load test module is fixed to the load test module fixed base plate by bolts through waist-shaped holes, and the load test module fixed base plate adjusts the radial position through the waist-shaped holes.

[0025] In the above-mentioned high-speed electric-driven spline pair micro-wear experimental platform based on a six-axis parallel mechanism, the output speed range of the load motor in the load test module is the seventh preset range, and the rated torque is the fifth preset value.

[0026] In the above-mentioned high-speed electric-driven spline pair fretting wear test platform based on the six-axis parallel mechanism, the seventh preset range in the load test module is 0-12000 r / min, and the fifth preset value is 500 N·m.

[0027] Compared with the existing technology, the beneficial effects of the present invention are:

[0028] The present invention uses a six-axis parallel adjustment module to achieve angular misalignment and radial misalignment between the axes of the inner spline sleeve and the outer spline shaft in operation. At the same time, the offset is read by the platform's own sensor, and the angular misalignment and radial misalignment can be adjusted in real time. A laser measurement module is provided, and the misalignment can be monitored by a laser displacement sensor, and the error is monitored in real time by comparing with the data of the six-axis parallel adjustment module. The present invention is of great significance in proposing methods and measures to improve the fretting wear of the spline pair under high-speed conditions and in simulating actual use processes, as well as in improving the spline pair's anti-fretting wear capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A high-speed electric drive spline pair fretting wear test platform based on a six-axis parallel mechanism

[0030] Figure 2 Motor drive module structure diagram

[0031] Figure 3 External structure diagram of the six-axis parallel adjustment module

[0032] Figure 4Internal structure diagram of the six-axis parallel adjustment module

[0033] Figure 5 Laser measurement module structure diagram

[0034] Figure 6 Load test module structure diagram

[0035] The numbers in the figure are: 1-base, 2-height adjustment pad, 3-motor drive module, 301-drive motor, 302-drive motor frame, 4-coupling I, 5-inner spline shaft sleeve, 6-external spline shaft, 7-six-axis parallel adjustment module, 701-six-axis adjustment platform, 702-front bearing fixing seat, 703-rear bearing mounting seat, 704-rear bearing fixing seat, 705-front bearing end cover, 706-lip seal ring, 707-deep groove ball bearing I, 708-deep groove ball bearing II, 709-rear bearing end, 8-laser measurement extension shaft, 9-laser measurement module, 901- Laser measurement module fixed base, 902-laser sensor mounting base, 903-laser sensor, 904 axial fine-tuning slide, 905-radial fine-tuning slide, 906-radial coarse-tuning slide, 907-laser measurement module upper and lower connecting bases, 908 height fine-tuning slide, 909-height coarse-tuning slide, 10-universal coupling, 11-load test module, 1101-load test module fixed base plate, 1102-torque sensor fixing base, 1103-torque sensor, 1104-coupling II, 1105-load motor, 12-computer, 13-data acquisition device. DETAILED DESCRIPTION

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] Example: Figure 1-6 The figure shows a high-speed electric drive spline pair micro-wear experimental platform based on a six-axis parallel mechanism.

[0038] When the present invention is used, the specific steps are as follows:

[0039] 1. Install the base 1 on the ground. The upper part of the base 1 is a T-slot plate for easy installation and adjustment.

[0040] 2. Assemble the six-axis adjustment platform 701. Install the front bearing fixing seat 702 on the six-axis adjustment platform 701 with bolts. Install the front bearing end cover 705, lip seal 706, and deep groove ball bearing I 707 on the front bearing fixing seat 702 in sequence. Install the rear bearing fixing seat 704 on the rear bearing mounting seat 703 with bolts. Install the deep groove ball bearing II 708 and rear bearing end cover 709 on the rear bearing fixing seat 704 in sequence.

[0041] 3. Install the six-axis parallel adjustment module 7 on the external spline shaft 6 to assemble the six-axis parallel adjustment module 7 into a whole, and install the six-axis parallel adjustment module 7 on the base 1 through bolts.

[0042] 4. Connect the motor shaft of the drive motor 301 to the internal spline sleeve 5 through the coupling 4, and assemble the drive motor 301 and the drive motor frame 302 with bolts.

[0043] 5. Install the motor drive module 3 on the base 1, adjust the axial distance through the T-slot on the base 1, adjust the installation height through the height adjustment pad 2, adjust the radial distance through the waist hole on the drive motor frame 302, and adjust the position in each direction so that the central axis of the drive motor 301 coincides with the central axis of the shaft parallel adjustment module 7, so that the inner spline sleeve 5 and the outer spline shaft 6 form a spline pair.

[0044] 6. Assemble and fix the laser measurement extension shaft 8 and the external spline shaft 6.

[0045] 7. Assemble the load test module fixing base 1101, the torque sensor fixing base 1102 is installed on the load test module fixing base 1101 through bolts, the torque sensor 1103 is installed on the torque sensor fixing base 1102 through bolts, and the torque sensor 1103 is connected to the load motor 1105 through the coupling II 1104.

[0046] 8. Install the load test module 11 on the base 1. Adjust the axial distance using the T-slot on the base 1 and the installation height using the height adjustment block 2. Adjust the radial distance using the waist hole on the load test module fixing base 1101. Adjust the position in all directions so that the center axis of the load motor 1105 coincides with the center axis of the shaft parallel adjustment module 7.

[0047] 9. Connect the laser measurement extension shaft 8 to the torque sensor 1103 through the universal coupling 10.

[0048] 10. Install the height coarse adjustment slide 909, height fine adjustment slide 908, laser measurement module upper and lower connecting seats 907, radial coarse adjustment slide 906, radial fine adjustment slide 905, axial fine adjustment slide 904, laser sensor mounting seat 902, and laser sensor 903 on the laser measurement module fixed base 901.

[0049] 11. The laser measurement module fixed base 901 is installed on the base 1 by bolts. First adjust the coarse adjustment slide 909, then adjust the height fine adjustment slide 908 to adjust the height position of the laser sensor; first adjust the radial coarse adjustment slide 906, then adjust the radial fine adjustment slide 905 to adjust the radial position of the laser sensor; finally, adjust the axial position through the axial fine adjustment slide 904 to put the laser sensor in place.

[0050] During the experiment, the drive motor 301 was first started and accelerated to the operating torque and speed. The six-axis parallel platform 701 in the six-axis parallel adjustment module 7 then adjusted the six degrees of freedom of the platform's top surface by adjusting the extension lengths of six high-precision, high-rigidity electric push rods. The top surface of the six-axis parallel platform was vertically fixed to the front bearing mount. By converting the center coordinates of the six-axis parallel platform 701 with the center coordinates of the front bearing mount 702, radial misalignment, angular misalignment, and axial float were adjusted. The data acquisition device 13 input the misalignment, speed, and torque information collected by the laser sensor 903 and torque sensor 1103 into the computer 12, which then performed the relevant statistical analysis.

[0051] The specific embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the scope of the present invention.

Claims

1. A high-speed electric-driven spline pair fretting wear test platform based on a six-axis parallel mechanism, characterized by: It includes a base, a height adjustment pad, a motor drive module, a coupling I, an internal spline sleeve, an external spline shaft, a six-axis parallel adjustment module, a laser measurement extension shaft, a laser measurement module, a universal coupling, a load testing module, a computer, and a data acquisition device; the motor drive module includes a drive motor and a drive motor frame; the six-axis parallel adjustment module includes a six-axis adjustment platform, a front bearing fixing seat, a rear bearing fixing seat, a rear bearing fixing seat, a front bearing end cover, a lip seal ring, a deep groove ball bearing I, a deep groove ball bearing II, and a rear bearing end cover; the laser measurement module includes a laser measurement module fixing base, a laser sensor mounting seat, a laser sensor, an axial fine-tuning slide, a radial fine-tuning slide, a radial coarse-tuning slide, upper and lower connecting seats of the laser measurement module, a height fine-tuning slide, and a height coarse-tuning slide; the load testing module includes a load testing module fixing base, a torque sensor fixing seat, a torque sensor, a coupling II, and a load motor. The torque and speed sensor is used to detect the speed and torque during the test; the six-axis parallel adjustment module uses six electric push rods to adjust the radial misalignment, angular misalignment and axial float in real time; the laser displacement sensor is used to monitor the radial misalignment and angular misalignment of the spline pair.

2. The high-speed electric-driven spline pair fretting wear test platform based on a six-axis parallel mechanism according to claim 1 is characterized by: The base is a T-slot plate, and the axial spacing of each component can be adjusted, which is convenient for installation and adjustment.

3. The high-speed electric-driven spline pair fretting wear test platform based on a six-axis parallel mechanism according to claim 1 is characterized by: The motor drive module and the load test module are adjusted in height by using height adjustment pads.

4. The high-speed electric-driven spline pair fretting wear test platform based on a six-axis parallel mechanism according to claim 1 is characterized by: The inner diameter and outer diameter of the deep groove ball bearing I in the six-axis parallel adjustment module are both larger than those of the deep groove ball bearing II.

5. The high-speed electric-driven spline pair fretting wear test platform based on a six-axis parallel mechanism according to claim 1 is characterized by: The laser sensor in the laser measurement module monitors radial misalignment and angular misalignment by monitoring the laser measurement extension shaft.

Images