2_2026_sen_1

Title of the article THE INFLUENCE OF GEOMETRIC FEATURES OF FRICTION CONTROL ELEMENTS IN PLANETARY GEARBOXES ON VEHICLE COMFORT DURING TRANSIENT PROCESSES
Authors

BUTUZOV Dmitriy V., Senior Specialist, FSUE “NAMI”, Moscow, Russian Federation, This email address is being protected from spambots. You need JavaScript enabled to view it.

NAGAYTSEV Maxim M., Ph. D. in Eng., CEO, KATE LLC, Moscow, Russian Federation,This email address is being protected from spambots. You need JavaScript enabled to view it.

TARATORKIN Alexander I., D. Sc. in Eng., Chief Researcher, Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences, Yekaterinburg, Russian Federation,This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section MECHANICS OF MOBILE MACHINES
Year 2026
Issue 2(75)
Pages 5–14
Type of article RAR
Index UDK 62.235 + 534.013 + 629.3.075
DOI https://doi.org/10.46864/1995-0470-2026-2-75-5-14
Abstract This article addresses the issue of low-frequency longitudinal oscillations that reduce the comfort of vehicles with hybrid transmissions during launch conditions. It is demonstrated that traditional analysis based on the tribological properties of friction pairs does not allow for the prediction of this phenomenon. Using methods of modal analysis and state-space mathematical modeling, it was established that the source of the oscillations is the excitation of torsional resonances in an isolated kinematic circuit of the transmission during the slippage of the starting clutch. This occurs when multiple orders of excitation coincide with the slip frequency in the starting clutch. During bench and road tests, the key design factors modulating the friction torque were identified and quantitatively assessed: variation in friction disc thickness, deviation from the piston’s plane-parallel motion, and non-uniformity in the geometric parameters of the return springs. Based on the research results, a set of methods was developed for controlling and assembling friction elements. The implementation of this complex into the final gearbox assembly inspection process has completely eliminated the undesirable oscillations.
Keywords hybrid transmission, friction elements, torsional vibrations, modulation of the friction moment, modal analysis, ride comfort
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