In this work the dynamical load of vehicle's hydraulic gear during disperse was analyzed. There were regarded peculiarities of piston’s speed changing depending on time in presence of influence of mechanically immovable elements masses of vehicles and strengths conducting on a piston. Solution of mathematical equations for modelling of hydraulic gear dynamics has been made. In this case dynamical calculation has a control nature and allows evaluation if calculated parameters of a gear provide given dynamical characteristics of the system.
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