Abstract
To investigate the friction performance of transmission oil, an evaluation method based on actual wet clutch engagement mode of loader was established, which considered the influence of sliding speed and pressure of wet friction plates. The results show that transmission oil has a significant effect on the mid-point dynamic friction coefficient, the end-static friction coefficient and the static-to-dynamic ratio. At the same speed, the mid-point dynamic friction coefficient increases as the pressure increases, and the end static friction coefficient and the static-to-dynamic ratio both show a downward trend; At the same pressure, the coefficient of mid-point dynamic friction decreases with the increase of sliding speed. The coefficient of friction decreases and the static-to-dynamic ratio increases with the increase of energy density; the effect of speed on torque transmission is less than that of load. The designed test program can evaluate and effectively distinguish the transmission oils in terms of shift comfort and power transmission capacity and provide a basis for the selection of transmission oil.
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