Patent ID: 8079833

Claim:
A motor/pump assembly comprising a fluid-filled, hermetically sealed pressure enclosure containing an electric motor, a coolant pump coaxial with said motor comprising at least one impeller arranged in an impeller enclosure defined within a pump housing, a shaft assembly for transmitting a torque from the motor to the at least one impeller, a flywheel on said shaft assembly, said flywheel disposed within a flywheel chamber formed between a pump cover and a motor cover and arranged between the electric motor and the impeller enclosure, a motor mount disposed nearer to the flywheel than to the pump, within said motor cover, and so as to surround the shaft assembly, and a pump bearing disposed between the impeller enclosure and the flywheel chamber, wherein said flywheel comprises a flywheel body having a plurality of radially and circumferentially distributed, axially oriented cavities of various sizes with inserts of various sizes corresponding to the sizes of said cavities received therein, the inserts comprising a heavy-metal having a density of greater than 11.0 kg/dm 3 arranged fixed in the flywheel body in said cavities to promote continued flywheel body rotation by increasing a flywheel body moment of inertia, wherein a flow path passing through the pump housing interconnects said impeller enclosure, downstream of said impeller, and said flywheel chamber within which said flywheel is disposed, and wherein the motor cover has a connection for fluid communication with a cooling system of the motor, fluid communicating with the cooling system of the motor also acting as lubricating fluid for said motor mount.