OK, but what causes the pulley to turn the shaft if there's a bearing there? That's what I was wondering. I realize there are differences between designs. but SOMETHING has to connect the shaft to the pulley. :shrug03:The drawing is 100% accurate for the 57 Chevy compressor. I've rebuilt it.
Ok I went back and studied the picture. One clutch plate is keyed to the shaft and rotates with it. When the coil energizes it pulls the clutch plate fixed to the shaft and the one on the pulley together and stops the relative rotation of the pulley bearing.
On the GM compressor, the pulley bearing is pressed over the case and the clutch plate is keyed to the shaft. So on that design, the pulley is always turning the bearing relative to the fixed compressor housing.
I'll shut up now.