DETERMINATION OF QUALITY AND LOAD INDICATORS OF GEAR WITH HCR ENGAGEMENT WHEN IT IS USED IN TRANSMISSION ELEMENTS OF EXISTING MACHINES

The article is devoted to the evaluation of the use of an involute spur gear with an increased overlap ratio (HCR engagement) in the wheel planetary gearbox of the T-150K tractor, which is similar to the on-board transmission of the T-150 crawler tractor. The main criterion for the design of new gears with HCR engagement is to obtain an overlap ratio greater than 2.03. Given that the task is to replace the existing gears of the planetary gearbox with new ones, such parameters as the center distance, the widths of the crowns of the gears and the number of satellites were unchanged. It was allowed to change the gear ratio of the new planetary gearbox within 3% compared to the basic one, but first of all, combinations of gear wheels of the planetary gear were considered, in which this parameter was as close as possible to the existing one. Transmissions with several standard modules were considered, which, on the one hand, allow to realize an overlap ratio of more than 2.03, and on the other hand, the bending stresses in the root of the tooth will not exceed the yield strength of the material. All calculations were carried out in the KISSsoft software package, which provides a comprehensive assessment of the quality and strength indicators of the planetary transmission, taking into account the simultaneous operation of all satellites and the elastic deformation of the teeth. In the qualitative indicators, the overlap ratio, specific slip and thickness of the tops of the teeth of all gears will be evaluated in order to prevent sharpening. Strength indicators will be presented by graphs of contact pressures in "solar gear-satellite" and "satellite-epicycle" pairs and bending stresses in all gears. All the results of the calculations were compared with those of the existing transmission in order to determine the feasibility of using the HCR clutch in the presented wheel gearbox.