In this paper, the belt-pulley mechanical loss for a metal belt continuously variable transmission is investigated. A bond-graph model for the belt-pulley mechanical loss is developed from the viewpoint of the power flow by assuming that all power losses are attributed to the torque loss. The coefficients of the power loss model are obtained from the experiments. It is found from the simulations and experiments that the steady state belt-pulley loss depends on the line pressure, the input torque, and the rotational speed while the transient loss depends on the rotational speed, the shift speed, and the inertial torque.
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