International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Direct Planetary gear mechanism normally consists of a single central gear at the center, an internal (ring) gear around the outside, some number of planet gears that go in between and a planet carrier. They are used to reduce or multiply the number of revolutions. For correct selection of the torque of the driving machine, it is necessary to know the moment of inertia of the planetary gear mechanism, which directly depends on the mass moment of inertia of the planetary gear mechanism and the angular acceleration. In this paper is analyzed the impact of the ratio of the radii of the central and planet gears on the mass moment of inertia of the planetary gear mechanism reduced to the axis of the central gear at a constant diameter of the internal gear. The changes in the reduced mass moment of inertia depending on the number of planet gears was also analyzed.

Friction clutches are mechanisms placed between the engine and the gearbox and are used to transmit the torque from the engine of the vehicle to the transmission. The clutches should provide start and stopping of the vehicle without vibration and need to have a certain lifetime. The tribological parameters of the linings in these clutches depend on several factors: the quality of the linings, the conditions of the test (exploitation), the temperature between the friction surfaces, the specific pressure between the friction surfaces, the speed of sliding of the friction linings, the number of turns on the clutch, etc. In this paper, will be analyzed the impact of the speed of sliding of friction linings on the tribological parameters of the linings.