A main direction in the development of passenger car designs is the improvement of their gearboxes. There is a consistent trend towards increasing the number of gear ratios, with modern passenger cars now utilizing gearboxes with six or more gears. This development is also marked by the concepts of the very distribution of the gear ratios. Various approaches are employed to adjust gear ratios based on the classic method of geometric progression distribution, resulting in significant improvements in the dynamic performance, fuel efficiency and car environmental impact. In this regard, the question of using appropriate criteria for evaluating the choice of gear ratios and their distribution in passenger car transmissions is becoming increasingly relevant. Within such a framework, the proposed criterion for evaluating engine power utilization serves as a valuable tool. By employing this criterion, an analysis of the gearboxes in some of the most popular passenger cars was conducted.

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