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Decreasing of dynamic loading of tractor’s powertrain by means of change of reactive element torsional stiffness

Kalmikov A. V., Sokolov-Dobrev N. S., Shekhovtsov V. V., Ljashenko M. V., Potapov P. V.

Journal of KONES

2015

Vol. 22, No. 1

127--134

This article describes original method proposed by authors that provides decreasing of dynamic loading of tractor’s powertrain by means of change of reactive element torsional stiffness. In tracked vehicles one of the most loaded elements is final drive unit which loaded by high dynamic modes. In tractor Chetra 6C-315, final drive is epicyclic where stopped element is ring gear. Authors propose using of strictly resilient (5 degrees in forward-backward direction) mount of ring gear instead of stiffening. Design study of installation between hub and gear ring that connects drum and crown gear, of the resilient metal plates pack was performed. This pack is kind of elastic coupling. Resilient packets of coupling sustain loads and smooth over peak dynamic loads and after elastic deformation of these packets rigid coupling between hub and coupling crown is provided at contact surfaces of skewed stops of hub and crown. To analyse efficiency of proposed method of dynamic loadings decreasing of powertrain elements three-dimensional model of powertrain was created in “Universal Mechanism”. In addition, solid model of caterpillar mover was created in the same software for analysis of influence on powertrain loadings of complex of kinematic and dynamic factors influencing forming of torque on driving sprockets. This article presents results of modelling of loading processes in powertrains elements with elastic coupling and without it during longitudinal motion at various speeds and in turns with various radii. Results show that elements dynamic loading at high loading dynamic modes in case of installed coupling is decreased by 20-30%.

The computational research of the dynamic load of the power train sites of the caterpillar tractor

Shehovtsov V., Sokolov-Dobrev N., Shevtchuk V. P., Ljashenko M. V., Kalmikov A.

Archiwum Motoryzacji

2013

Nr 2

79--91, 195--208

The paper describes the developed dynamic model of the caterpiller’s power transmission. Its advantage is the integrated dimensional model of caterpillar propeller. Animated motion modeling provides the formation and transfer of kinematic and dynamic disturbances from caterpillar chassis, causing the greatest loadings of the power circuit sections. The principle of power transmission mathematical model’s differential equations forming is described. result of the model’s computational research is a set oscillograms of the drive wheel’s torque changing for different operating modes. The values of power transmission masses’ natural frequencies are obtained. The research of the nature of transmission sections’ dynamic loading by torsional vibrations, that arise and spread on the shafting, when the linked track rewinds, is carried out.