INFLUENCE OF DYNAMIC LOAD ON GEAR TRANSMISSION DURABILITY OF HEAVY-DUTY ROADHEADING MACHINES

The article proposes a new method of calculation of the indicators of the durability of the gear transmission of heavy-loaded roadheading machines, allowing a more accurate assessment of the dynamic loading of the teeth. Within the framework of this technique, the elastic moment amplification factors determined by the amplitude-frequency characteristic of transmission are used instead of the specific circumferential dynamic force in the calculation of the maximum operating voltages. The maximum stresses in the bending of teeth and the probability of failure-free operation of the technical system are determined. A spur transmission used in the drive of the Executive body of roadheader is considered as an example of application of the proposed design technique. The comparison of calculated estimations of gear transmission reliability obtained on the basis of the standard method and using amplitude-frequency characteristics is carried out. In the considered design example durability of transfer for a step cycle of loading is more than 2 times higher in comparison with a continuous cycle of loading. It is shown that using a standard calculated coefficient that takes into account dynamic load, the calculated estimations of the durability of the transmission are significantly overestimated. At the same time, the error of the standard method will depend on the frequency range at which the transmission operates, and this error is most significant when the transmission operates near its own frequencies.

durability characteristics, gear transmission durability, dynamic load, roadheading machine

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