Abstract
To investigate the influence of the groove shape of friction disks on the wear of a friction clutch friction pair, a wear calculation model that considers the actual sliding distance between the friction clutch friction pair is presented based on the Archard adhesive wear model. The wear of three different groove-shaped friction pairs was calculated and analyzed. The wear test was carried out on the SAE#2 testing rig to obtain the actual wear amount and verify the accuracy and validity of the mathematical model. The results show that, among the three types of grooves, the friction disks with waffle grooves were the most prone to wear, followed by three-way parallel grooves. The wear performance of the two-way parallel grooves was the best, and the wear from one-time engagement can better reflect the change in the dynamic engagement of the friction pair. With the increase in the engagement time, the increase of the wear amount decreases.
Highlights
Since the development of helicopter technology, it is increasingly difficult to balance the aerodynamic performance of hovering and high-speed flight with fixed speeds.Variable-speed transmissions will be an effective way to promote the performance of highspeed helicopters
The mechanism and the change law of the friction pair and the calculation method of the relative slip distance of the disks in the clutch engagement process were studied, and some of the existing problems in the current aviation clutch were solved, which are the basis for improving the life of the aviation wet clutch and for guaranteeing the safety of the aviation wet clutch
Lewicki and Hans DeSmidt [3] conducted dynamic simulation analysis and experimental verification on the two-stage gearbox and established a dynamic model of the transmission system and a model of clutch stick–slip friction and wear. They found that the dynamic model of the transmission system was very consistent with the experimental results, especially in terms of speed, torque, and current, which were within 10% of the experimental data
Summary
Since the development of helicopter technology, it is increasingly difficult to balance the aerodynamic performance of hovering and high-speed flight with fixed speeds. Lewicki and Hans DeSmidt [3] conducted dynamic simulation analysis and experimental verification on the two-stage gearbox and established a dynamic model of the transmission system and a model of clutch stick–slip friction and wear They found that the dynamic model of the transmission system was very consistent with the experimental results, especially in terms of speed, torque, and current, which were within 10% of the experimental data. Markus Kneissler [4] established a wear model of automobile friction disks and determined the difference by comparing the initial clutch engagement process and the clutch engagement process after running-in, respectively. Analyzed the wear of the wet clutch during the engagement process based on the Reynolds equation and the rough surface contact model. Calculated the friction disk wear by regarding the sliding distance as the product of speed and time directly and carried out the test on the clutch bench in accordance with the wet clutch friction element test method. For different groove-shaped friction disks, this paper calculates the amount of wear on friction disks during a single engagement, determines which groove shapes produce less wear during actual working conditions, and uses friction disks with different groove shapes to carry out wear tests on the test machine, demonstrating the accuracy of the theoretical calculations and providing references for the design and analysis of friction clutches
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