An injection molded motor mount was designed to support the motor shaft bearing and incorporate two bearing holding tabs. The chosen design has a curved nominal wall that follows the form of the motor shaft to reduce the size of the part and the material used. Fillets have been added to all of the sharp corners of the part to make them easier to fill and avoid high molded-in stresses. Ribs were incorporated into the tabs to add support and rigidity. Two pins are built into the tabs on opposite corners of the part to position the motor mount relative to the shaft alignment part. The deflection of the tab was computed using a cantilever-end load condition, and the stress of the tab was calculated using the bending stress equation. A tab deflection clearance of 0.020” was assumed in order to calculate the corresponding force needed. The Nylon has a yield strength of 12 ksi. The maximum stress the tabs will have are 10.5 ksi, so the tabs should not fail.
