BMW A/C Belt
On this engine the belt adjuster is a pivoted idler pulley which is swung against the belt. The requirement was to design a tension setting tool which used a single power tool for both making the adjustment and also to torque down the idler locking bolt.
This was accomplished by designing a jig plate which had a screw jack type configuration which operated on the idler pulley. A CLAVIS optical sensor and electromechanical hammer made the tension measurement which controlled the power tool in a closed loop mode. Once the setting was made the operator transferred the same power tool to the locking bolt. Finally the operator transferred the power tool back to the screw jack to reverse back to the start position ready for the next engine. All the operations are performed at high tool rpm so that the cycle time for the complete setting sequence was less than 25 seconds.
