VS - Electrical Systems From Stop-Start to Hybridization

Decoupling tensioners reference point is the machine itself

Decoupling Alternator Tensioner

Mounting The Decoupling Alternator Tensioner is mounted on the front bracket of the electrical machine on three protruding fixation studs and fixed with three screws.

A further step ahead in tensioner systems has been achieved with the Decoupling Alternator Tensioner. The Decoupling Alternator Tensioner is directly mounted on the electrical machine. It is a dual tensioner (pendulum type) equipped with two rollers that allows every kind of operations provided by a reversible machine in both motor and generator modes (cranking, generating, regenerative braking, torque assistance…). Decoupling Alternator Tensioners are applied for: ●● Larger belt wrap angle to the machine pulley ●● Maximized wrap angle by self adaptive angular positioning according to the torque level and direction ●● Torsional vibrations damping capacity

Operational behavior

The Decoupling Alternator Tensioner is composed of two arms rotating with respect to each other and to the housing which is mounted on the front bracket of the electrical machine. These two arms are equipped with one flat roller each and are linked by a bent spring that is used to maintain the two rollers in contact with the belt and to ensure a minimal level of belt tension in the four spans around them and, thus, in the other spans of the belt drive. The Decoupling Alternator Tensioner acts as if it was two mechanical tensioners linked with each other, sharing an identical rotating point located on the axis of the electrical machine pulley. The particular design of the Decoupling Alternator Tensioner allows a decoupling effect comparable to the one provided by an electrical machine decoupling pulley, thanks to its bent spring that links the two rollers. As a result, variations of belt tensions, hub loads and effective torques due to engine speed irregularities are drastically reduced on the electrical machine pulley, the surrounding spans and on the rest of the belt drive.

Decoupling tensioners self adapt their angular position according to the torque level and direction.

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