Drag torque reduction is one of the key targets to improve the efficiency of transmission. Drag torque is generated by the automatic transmission fluid (ATF) that is circulated in the gap between the friction disks and separator plates for cooling purpose. Due to the relative motion between the friction disks and separator plates in disengaged mode, a shear stress is developed on the disks’ wall which gives rise to drag loss. The most conventional technique to suppress the drag loss is to cut grooves on the friction disk to facilitate smooth and faster discharge of the ATF. The shape of the grooves also plays a substantial role on the drag torque characteristics. Previously, we presented a simplified simulation model to predict the drag torque behavior of different grooves. However, the simplified model doesn’t include the oil inflow and outflow behavior from the oil inlet and outlet holes respectively. In this research, we presented an improved simulation model with an extended simulation domain to consider the effect of oil inflow and outflow behavior on the drag torque. This model helps us to realize the influence of the groove size and shape on the multi-phase drag torque behavior in more detail. The comparative profile of different grooves obtained from simulation reflects close similarity with the test result. Therefore, the simulation model leads to a convenient method of optimizing the size and shape of the grooves and plays a pivotal role to select better groove pattern for the suppression of drag loss.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Multi-Phase Simulation for Studying the Effect of Different Groove Profiles on the Drag Torque Characteristics of Transmission Wet Clutch


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2016 World Congress and Exhibition ; 2016



    Publication date :

    2016-04-05




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Multi-Phase Simulation for Studying the Effect of Different Groove Profiles on the Drag Torque Characteristics of Transmission Wet Clutch

    Mahmud, Syeda Faria / Pahlovy, Shahjada A. / Kubota, Masamitsu et al. | British Library Conference Proceedings | 2016


    Multi-Phase Simulation for Predicting Better Groove Pattern of the Clutch Disk for Low Drag Torque

    Kubota, M. / Ogawa, Makoto / Takakura, Norio et al. | SAE Technical Papers | 2015


    Wet Clutch Drag Loss Simulation for Different Clutch Patterns

    Szalai, Gábor / Bansal, Hemant / Leighton PhD, Michael et al. | SAE Technical Papers | 2022


    Wet Clutch Drag Loss Simulation for Different Clutch Patterns

    Szalai, Gábor / Ray, Rakesh / Bansal, Hemant et al. | British Library Conference Proceedings | 2022


    Effect of Facing Groove Design on Drag Torque of Automatic Transmission Wet Clutches

    Asai, Kazunari / Ito, Takanobu | SAE Technical Papers | 2018