| 摘要 |
<p>The invention comprises an asymmetric damping tensioner (10) system for belt drives on an engine. A belt (16) is connected between a driver pulley (18) on a crankshaft and any number of driven pulleys. Each drive pulley is connected to an accessory such as an alternator, power steering pump, compressor or the like. The tensioner (10) is placed anywhere before the first component of significant effective inertia, in the belt movement direction. A biasing member (70) in the tentioner is used to maintain a tention in the belt. The tensioner further comprises a damping mechanism (34) to damp belt vibrations caused by the operation of the engine. Tensioner damping friction is unequal or asymmetric, depending upon the direction of movement of the tentioner arm (52). During acceleration the damping friction of the tentioner (10) in the unloading direction is significantly lower than the damping friction in the opposite, or loading direction, as is the case during deceleration. Lower damping friction during acceleration allows the tensioner arm (52) to quickly adjust to the increase in belt length caused by acceleration. Higher damping friction during deceleration prevents the tensioner arm (52) from being moved too far in the loading direction thereby causing slipping and noise. Asymmetric damping also significantly diminishes overall vibration in the belt during all phases of operation.</p> |
