Current heavy duty diesel valvetrains are not able to utilize hydraulic lash adjusters (HLA) in conjunction with an engine brake. During a braking event the engine brake introduces substantial lash into the vehicle valvetrain. The HLA reacts by pumping out to take up the lash encountered during braking, thereby preventing the valves from properly seating at the end of the cycle. Jacobs Vehicle Systems has developed a new mechanism to allow the inclusion of an engine brake into a valvetrain equipped with hydraulic lash adjusters. The fulcrum system maintains a load on the hydraulic lash adjuster during engine brake operation preventing the HLA from extending. HLA are appealing to engine manufacturers because they allow for simpler manufacturing, less maintenance, reduced NVH and valve motion enhancements. This paper describes the design, simulation and testing of the lashless valvetrain with engine brake including the next steps in the development of the valvetrain.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Hydraulic Lash Adjuster Compatible Engine Brake


    Additional title:

    Sae Int. J. Engines


    Contributors:

    Conference:

    SAE 2016 Commercial Vehicle Engineering Congress ; 2016


    Published in:

    Publication date :

    2016-09-27


    Size :

    6 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Hydraulic Lash Adjuster Compatible Engine Brake

    Ferreira, David / Howell, Thomas / Jo, Peter | British Library Conference Proceedings | 2016


    Application of super carborizing to hydraulic lash adjuster

    Namiki,K. / Nakayama,K. / Iwano,T. et al. | Automotive engineering | 1988


    Application of Super Carburizing to Hydraulic Lash Adjuster

    Nakayama, Kenji / Namiki, Kunio / Kenmoku, Takeji et al. | SAE Technical Papers | 1988



    Multi-angle ball ramp brake actuator with automatic lash adjuster

    POLCUCCI EDMUND A / GRAU MICHAEL J | European Patent Office | 2024

    Free access