加速運転を想定した動的条件下における自動車用トルクコンバータのキャビテーションに関する実験的研究

抄録

Cavitation in torque converters causes negative effects such as noise, vibration, and performance degradation. In actual machines, the occurrence of cavitation is suppressed by sufficiently pressurizing the working fluid with the oil pump, but the power required for it hinders improvement of fuel consumption. In this study, experiments were conducted under dynamic conditions assuming an accelerated operation of automobile, and the effects of acceleration on the cavitation appearance and torque performance of a torque converter were investigated. As a result, the cavitation development was delayed as the acceleration was larger, that is, as the acceleration time was smaller. It is considered that the growth of cavitation is delayed in the smaller acceleration because the diffusion of the air dissolved in the oil is insufficient. As for torque performance, the smaller the acceleration was , the lower the torque was. This is considered to be due to the fact that cavitation is more developed with the sufficient diffusion of dissolved air in the smaller the acceleration case.