Since the gear tester is specifically designed to identify the characteristics of the gear oil, it is necessary to carry out this test. When the force load of the test gear is lower than the protective performance value of the gear oil to the gear, the surface of the gear tooth has no signs of biting; and when the force load of the test gear is higher than the above value, the gear tooth contact surface Mild scratches or early teething can be seen. If there are no signs of biting on the test gear, but the wear particles that are invisible to the naked eye are found in the extracted oil sample, it means that the gear teeth have already occurred. At this time, although the gear scratch was not seen, we examined the extracted oil sample and found that it contained large and rough wear particles, which were brown or black wear particles due to the inability to persist in the high temperature.
The brownish wear particles observed during light toothing continued to test. It was found that the surface of the test gear teeth began to smoke, and the speed and current of the gear test machine were unstable, indicating that the gear teeth had occurred. We stopped the test machine and inspected the test gear and found that there were obvious bite marks on almost the entire gear surface. We once again inspected the lubricant and found that it contained large and coarse particles, and found those abrasive grains that were first observed in the early stage of scratching because of the high temperature and were brown or black. This shows that gear teeth have been further developed. It is. Diagnosis of the amount of wear in the gear unit Even if there is no impurity inside the gear unit, the components gradually wear out as the operation is performed. This wear is different from the wear caused by the intrusion of external impurities, and the wear that is gradually generated during normal operation is called normal wear. If this wear is further developed beyond the size limit of the gear unit components, the gear gap will become too large, causing abnormal vibration and leakage of lubricating oil.
Therefore, in order to diagnose the internal wear of the gear device without disassembling the gear device, it is necessary to determine the degree of wear by analyzing the wear particles in the lubricating oil. Fortunately, when the gear unit is worn inside, its wear particles are not lost and are contained in the lubricating oil. Therefore, by detecting the amount of abrasive grains in the oil sample, it is possible to judge the degree of wear inside the gear unit.
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