| 摘要 |
A switchable drive pulley system that allows driving engagement or disengagement of a pulley from the shaft of an accessory drive. The pulley is mounted to the shaft by a bearing having an inner ring that rotates with the shaft and an outer ring that rotates with the pulley. A friction disk is arranged adjacent to the bearing inner and outer ring. When axial pressure is applied to the friction disk, relative motion between the inner and outer bearing rings is stopped, allowing transfer of torque from the pulley to the shaft to drive the accessory drive, with the pulley and shaft rotating at the same speed. When pressure is removed from the friction disk, the pulley and the outer bearing ring can spin independently of the inner ring and shaft. The shaft can therefore remain stationary while the pulley continues to turn driven by the accessory belt drive.
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