Abstract
For sliding friction pairs formed by differential gears and gaskets, it is necessary to study the friction performance under the coupling of multiple working conditions (impact, vibration and alternating load). For example, it is of great significance to study the performance of sliding friction pair in the rear axle differential of truck and the friction and wear performance of the internal parts of aircraft and ships under the coupling condition of multiple working conditions, so as to obtain longer service life and excellent performance by improving the friction performance. The ball-disc pairs were experimentally built to simulate the friction and wear mechanism of materials under different types of dynamic loads. Under the condition of non-polluting white oil lubrication, increased the contact ratio of the pair, and made the pair reach the experimental state of no dynamic pressure lubrication, selected different types of dynamic loads (step load, damped harmonic excitation load (DHE), Short-term high load) loading method. During the experiment, force sensors and online visual ferromagnetic sensors were used to monitor friction and wear rate signals in real time, and TR200 profilometer and scanning electron microscope were used to observe and study friction characteristics. The results show that a reasonable step load can improve the friction and wear state of the ball-disk pair during the running-in period and reduce the peak wear of the surface contact portion of the pair of materials. The main wear form of the experimental pair under constant load and step load for plastic flow and squeezing deformation, the fatigue of the surface material is caused by the high frequency fluctuating load of DHE. Therefore, it is concluded that the step load has an effect on improving the friction and wear performance of the mating pair, and the DHE load has a damage effect on the mating pair.
Highlights
In industrial production and application, such phenomena of variable as load impact, vibration and alternating load were very common [1,2,3]
When the friction pair composed of the differential gear and the gasket was subjected to variable loads such as damped vibration load (DHE), step load, and short-time high load, it was fairly necessary to study its working performance
It shows that the step load can alleviate the wear rate during the running-in period, but the running-in period is extended
Summary
In industrial production and application, such phenomena of variable as load impact, vibration and alternating load were very common [1,2,3]. The sliding friction pair composed of the differential gear and the spherical gasket in the rear axle differential of a truck was subjected to the vibration load caused by the shock absorbing spring. When the friction pair composed of the differential gear and the gasket was subjected to variable loads such as damped vibration load (DHE), step load, and short-time high load, it was fairly necessary to study its working performance. [5] studied the effect of friction and wear caused by step load on radial spherical plain bearings. For the sliding pair consisting of differential gears and gaskets, ball-disk sliding pair simulation can be applied to study the effects of different loading methods, lubrication types, contact surface morphology and other factors on their tribological properties [7,8,9].
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