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.
DECOUPLER WITH TUNED DAMPING
ENTKOPPLER MIT ABGESTIMMTER DÄMPFUNG
ORGANE DE DÉCOUPLAGE À AMORTISSEMENT ACCORDÉ
2019-12-25
Patent
Electronic Resource
English
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 |
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