The operating characteristics of the check valve in the clutch piston of an automatic transmission have a great effect on the shifting performance and durability of the developed clutch package test rig was used to visualize the flow and make pressure measurements in the vicinity of the check valve. The results indicate that the strength of the vortex just in front of the check valve strongly influences the opening and closing hydraulic pressure of the valve. It was also found that the vortex causes a pressure drop, which is related to the rotating speed of the clutch piston, oil volume discharged from the check valve and valve geometry. These results were used to design an improved check valve which provides a suitable oil pressure curve for achieving smoother shifting.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Improved Automatic Transmission Provides Smoother Shifting through Accurate Hydraulic Control


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1988



    Publication date :

    1988-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Improved automatic transmission provides smoother shifting through accurate hydraulic control

    Kato,Y. / Hitomi,N. / Hattori,N. et al. | Automotive engineering | 1988


    Improved automatic transmission provides smoother shifting through accurate hydraulic control

    Kato, Y. / Hitomi, N. / Hattori, N. et al. | Tema Archive | 1988


    Smoother transmission

    Online Contents | 2002



    Multi-mode infinitely variable transmission that provides seamless shifting

    REKOW ANDREW K / GUGEL RAINER / MUELLER DAVID et al. | European Patent Office | 2020

    Free access