This paper presents a methodology for numerical investigation of a full flexible balancer drive together with engine and crank train under realistic operating conditions where shaft dynamics, gear contact and rattle impacts, gear root stresses and friction losses in bearings and gear interaction are taken into account and can be balanced against each other to achieve the design criteria.Gear rattle is driven by the speed fluctuation of the crank train, the resistance torque (mainly friction), shaft inertia and the backlash in the gears. The actual trend to engine downsizing and up-torqueing increases the severity to rattle as engines are running on higher combustion pressures. This increases torque and speed fluctuation, which makes the detailed investigation in this torque transfer even more demanding.A common method to reduce gear rattle is the usage of so-called scissors gears. The layout of those gears has significant influence on the gear durability and the overall losses, which requires a detailed and precise model to find the best compromise for the spring stiffness and preload.The investigation is shown for a modern Inline 4-cylinder Diesel engine, equipped with a 2nd order mass balancing system and scissors gear between the crankshaft and the first balancer shaft. The change of gear contact loads, gear rattle, root stresses and balancer drive losses versus the operating range is presented and discussed. Sensitivity analysis of gear profile data and parameters of the scissors gear is performed.This methodology allows the engineer a precise layout and detailed design of such system to reduce noise and losses and avoid gear failure, considering main and contra-dictionary effects, and within reasonable time.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Numerical Investigation in a Gear Drive of an Engine Balancing Unit with Respect to Noise, Friction and Durability


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    12th International Conference on Engines & Vehicles ; 2015



    Publication date :

    2015-09-06




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Gear/drive unit

    OBERLE HANS-JUERGEN / SCHMIDT WILLI / LIENIG ANDREAS | European Patent Office | 2017

    Free access

    A friction-drive variable speed gear

    Engineering Index Backfile | 1927



    Elastomer Isolator Gear Design to Meet Noise, Vibration and Durability of Internal Combustion Engine

    Sivakumar, Anandan / Kulkarni, Chaitanya Govind / Raghavendra, G. et al. | SAE Technical Papers | 2013


    Diesel engine injection pump drive gear movement analysis for noise reduction

    Ishihara,A. / Industrial Power Alliance,IPA,JP | Automotive engineering | 2001