The present invention relates to an endless drive arrangement for an engine (10), comprising: a crankshaft pulley; an alternator pulley (24, 124) mounted to an input shaft (15) of an alternator (18), wherein the alternator (18) operates at at least a first switching frequency and a second switching frequency; an endless drive member (14) that is positioned to transfer power from the crankshaft pulley to the alternator pulley (24, 124) such that first order vibrations are produced at the crankshaft (12); and a decoupler (20) including a hub (22, 122) that is adapted to be coupled to the alternator shaft (15) such that the alternator shaft (15) co-rotates with the hub (22, 122) about a rotational axis, a pulley (24, 124) rotatably coupled to the hub (22, 122), the pulley (24, 124) having an outer periphery that is positioned to engage the endless power transmitting element (14), an isolation spring (28, 128) positioned to transfer rotational force from the pulley (24, 124) to the hub (22, 122) and to accommodate torsional vibration between the pulley (24, 124) and the hub (22, 122), a first friction surface (60, 160) operatively connected with the pulley (24, 124), a second friction surface (62, 162) operatively connected with the hub (22, 122), a biasing member (68) positioned to exert a bias force between the first and second friction surfaces (60, 160; 62, 162), and a retainer (96) engaging the biasing member to maintain the bias force,wherein the second switching frequency is near a natural resonance frequency of the decoupler (20) and the bias force between the first and second friction surfaces (60, 160; 62, 162) generates a damping torque during relative rotational movement between the pulley (24, 124) and the hub (22, 122) which attenuates said first order vibrations so as to reduce a tendency of the alternator to operate at the second switching frequency, thereby reducing a tendency of the alternator (18) of transmitting vibration to the decoupler at frequencies near the natural frequency. Further it is provided a decoupler and a method for operating an engine accessory drive.


    Access

    Download


    Export, share and cite



    Title :

    DECOUPLER WITH TUNED DAMPING


    Additional title:

    ENTKOPPLER MIT ABGESTIMMTER DÄMPFUNG
    ORGANE DE DÉCOUPLAGE À AMORTISSEMENT ACCORDÉ


    Contributors:
    ANTCHAK JOHN R (author) / XU JUN (author) / MARION PATRICK (author) / WILSON LUCAS (author) / BOUDREAU JUSTIN (author) / SPICER GARY J (author)

    Publication date :

    2019-12-25


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    F16D COUPLINGS FOR TRANSMITTING ROTATION , Nicht schaltbare Kupplungen / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / F02B INTERNAL-COMBUSTION PISTON ENGINES , Brennkraftmaschinen mit innerer Verbrennung mit Verdrängerwirkung / F16F SPRINGS , Federn / F16H Getriebe , GEARING



    DECOUPLER WITH TUNED DAMPING AND METHODS ASSOCIATED THEREWITH

    ANTCHAK JOHN R / XU JUN / BOUDREAU JUSTIN et al. | European Patent Office | 2020

    Free access

    DECOUPLER WITH TUNED DAMPING AND METHODS ASSOCIATED THEREWITH

    ANTCHAK JOHN R / XU JUN / WILSON LUCAS et al. | European Patent Office | 2018

    Free access

    DECOUPLER WITH TUNED DAMPING AND METHODS ASSOCIATED THEREWITH

    European Patent Office | 2018

    Free access

    DECOUPLER WITH TUNED DAMPING AND METHODS ASSOCIATED THEREWITH

    European Patent Office | 2019

    Free access

    Decoupler

    DELL JAMES W / ANTCHAK JOHN R | European Patent Office | 2017

    Free access