Below is a pdf of a CAD drawing that shows the design of a key way style motor hub adapter that we recently received. At the top center is a brass bushing inserted into the steel adapter that functions as a pilot bearing for the end of the transmission shaft. We would have preferred a ball bearing, but brass was chosen by the machinist instead.
9/21/2012
Correction: John Emde at Pioneer Conversions indicated that the pilot bearing is made of a Bronze alloy that is designed for this type of application.
The darker vertical rectangle on the left side is the key that is shown inserted between the adapter and the motor shaft. The two light areas on the left side of the adapter and adjacent to the key, are set screw insertion points.
The two vertical light sections at the top left and the top right aspect of the adapter represent insertion ponts for two of the eight bolts that mount the flywheel to the adapter face.
The motor shaft is at the bottom of the drawing. Note that the motor factory provided for a pilot bearing by predrilling the motor shaft. This detail will not be used in our design and for strength we would prefer the shaft to be solid right to the tip of the motor shaft.
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