| Summary: | <p><strong>The aim</strong> of the work is to develop a calculation method for slipping parameters of friction clutches (of the slipping work and time) in tractor gearboxes at various gear overlaps and for different friction clutches installation on the shafts.</p><p>The work has used theoretical and experimental research methods: the former were based on methods of analytical mechanics and motion theory of wheeled and tracked vehicles, while the latter assumed testing full-sized prototypes of friction clutches and friction clutches in gearboxes.</p><p>The work has brought the following results: a universal acceleration diagram has been offered for a tractor unit at shifting gears with different overlaps, valid for any relation between the gearing time and friction clutch slipping; based on the mathematical models of acceleration of the tractor unit, we have developed a generalized calculation method for parameters of the friction clutch slipping (of the slipping work and time), when shifting gears with different overlaps, at starting off a tractor unit and at bench tests of friction clutches and friction clutches in gearboxes.</p><p>The scientific novelty of the work is in development of the following:</p><p>- A theoretical acceleration diagram of a tractor unit with gear shifting in the gearbox with different overlaps;</p><p>- A mathematical acceleration model of a tractor unit and friction clutch slipping in the gearbox at gear shifting with different overlaps, and when starting a tractor unit off;</p><p>- A generalized calculation method for parameters of the friction clutch slipping (of the slipping work and time), when shifting gears in the gearbox with different overlaps, when starting a tractor unit off and at bench tests of friction clutches and friction clutches in the gearbox.</p><p><strong>Conclusions:</strong> The developed universal acceleration mathematical model for a tractor unit at gear shifting in the gearbox with different overlaps, and of its acceleration at starting off, allows defining – at the designing stage of gearboxes with friction clutches – their work and slipping time, and the acceleration time of a tractor unit, which may lead to designing reliable friction clutches and gearboxes with friction clutches. The proposed calculation method of the work of the friction clutch slipping in the gearbox at bench tests allows transferring test results into the operation loading mode, and, therefore, to perform fine-tuning of gearboxes with friction clutches at bench tests.</p>
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