US Patent 7771302 Apparatus for indicating power transmission belt dynamics

An apparatus for indicating an automotive power transmission belt dynamic is provided. The apparatus includes a belt tensioner including a support housing and an arm rotatably connected to the support housing. A pulley is carried by the arm, the pulley having a belt-engaging surface. A spring is connected to the arm and support housing to bias the arm to pivot relative to the support housing. A sensor is responsive to an input associated with a position of the arm relative to the sensor, the sensor providing an indication in response to receipt of the input. A signaling device is configured to provide a signal to a user in response to the indication provided by the sensor.