# Research on wear of low speed and heavy load gears

Tooth wear is one of the main failure forms of low speed and heavy load gear transmission. H. Winter has carried out a long time test on the low speed and heavy load gears with the circumferential speed V < 1m / s, and the test results are introduced and analyzed in detail. For the gear drive with V > 4m / s, many gear experts at home and abroad have carried out a lot of systematic tests and researches, and formed a practical calculation method of gluing (hot gluing). However, there is little research on the V = 1-4m / s gear transmission which is commonly used in the actual industrial production. This kind of gear occupies a large proportion in metallurgy, mining, heavy and general machinery. It is of great technical significance and economic value to understand the wear law of its tooth surface lubrication state, obtain its tribological design data, and then guide the design and production practice, so as to improve its bearing capacity and service life.

The test of ZHY gear shows that the low-speed and heavy-duty gear with v = 1-4m / S is still in the boundary lubrication state, the tooth surface wear is inevitable, and the cold gluing damage will occur under certain conditions. The results show that the wear rate and cold bond limit are different under different operating conditions. Based on the test, the wear of V = 1-4m / s low-speed and heavy-duty gear and the influence of circumferential speed V on the wear are studied. The test report on cold gluing is shown in.

(1) When v = 1-4m / s, the heavy-duty gear is in the boundary lubrication state, and the wear rate is related to the circumferential speed. The wear rate is the highest when the circumferential velocity is near the worst velocity. The worst speed is related to load, lubricating oil, surface roughness, micro morphology, material and heat treatment. Under the test conditions, the worst speed is around v = 1.41m/s and V = 1 / 13m. S, respectively. When the actual operating conditions change, the worst speed will also change

(2) The grinding speed determines the service life of the gear. Therefore, the gear with boundary lubrication should avoid running near the worst speed as far as possible.

(3) The worst speed value is the tribological design data which has great influence on the technical economy of low speed and heavy load boundary lubricated gears. It is necessary to conduct comprehensive and in-depth experimental research to obtain the worst speed value under different operating conditions, so as to guide the design and production practice.

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