Análise comparativa da resistência à flexão e ao contato de endrenagens crawler de transmissões automatizadas de caminhões pesados segundo a norma ANSI/AGMA 2101-D04

Abstract

The transportation of heavy loads requires mechanical components that are increasingly robust, efficient, and reliable. In this context, automated transmissions for heavy trucks play a fundamental role in ensuring performance, fuel economy, and durability. This work presents a comparative study of the tooth strength of the Crawler gear in the I-Shift AT2612G transmission, used in the Volvo FMX 540 truck, and the G33CM transmission, used in the Scania G560 XT truck — vocational models designed for off-road applications, especially in the sugar-energy, forestry, and mining sectors. The analysis was conducted based on the ANSI/AGMA 2101-D04 standard, which is used to calculate bending and contact stresses and safety factors in helical gears, employing Excel-based spreadsheets developed to determine the design parameters. Both gearsets were evaluated under the same torque regime of 2600 N·m, simulating severe operating conditions. Preliminary results indicate significant differences related to geometry, gear ratio, and the dimensions of the meshing pairs, directly influencing stress distribution and safety factors. The findings are expected to contribute to the understanding of the mechanical performance of automated transmissions used in severe-duty applications, as well as to future optimizations in automotive gear design.