Fan drive with water slinger seal

H - Electricity – 02 – K

Patent

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310/29

H02K 9/06 (2006.01) H02K 5/00 (2006.01) H02K 5/10 (2006.01)

Patent

CA 1308154

Abstract of the Disclosure A fan drive and water slinger seal for an electric motor mounted vertically under a dishwasher with the rotor shaft entering the liquid sump. A disk-shaped fan having alternating short and long planar blades radially extending between a cylindrical hub extending from a central opening accommodating the rotor shaft and the outer periphery of the disk is placed on the shaft so that a pair of opposing flats on the interior surface of the hub mate with a corresponding pair of flats on the shaft to prevent circumferential slippage between the fan and the shaft during motor operation. The fan hub also contains a spring like finger which extends upward axially along a groove in the inner wall of the hub and protrudes slightly in a radial direction to engage an annular groove on the rotor shaft near the motor and shield to prevent axial movement of the fan along the shaft. The fan is located on the shaft between the motor endshield and an overlying drip pan which encircles the shaft passing through a central opening in the pan and carries liquid leakage from the sump away from the motor. A flexible rubber-like disk-shaped slinger having an elongated tubular collar sized to snugly and adheringly fit on the shaft has an annular 0-ring type seal located within its cylindrical interior for engaging and sealing within a second annular groove on the motor shaft when the slinger collar is seated against the flat top of a slight hub protrusion, which it overhangs, from the flat, unbladed surface of the fan facing upward toward the liquid sump. The outer peripheral edge of the slinger ring atop the collar curves downward creating a peripheral cylindrical lip which overhangs and surrounds an upward extending lip about the periphery of the opening in the drip pan through which the motor shaft passes, the overhang thus preventing liquid in the drip pan from reaching the shaft or the motor.

606982

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