Patent ID: 6817266
Filing Date: 2004-11-16
Classification: F16C,F16F,Y02E,Y10T

Abstract:
A stiff, metallic hub for an energy storage device, having a flywheel assembly, wherein the hub produces a critical velocity that exceeds a design operating speed of the flywheel assembly, the stiff, metallic hub comprising:a central core in tight interference fit with a rotary shaft of the flywheel assembly; an outer rim section in tight interference fit with a high-strength, low-density composite fiber rim of the flywheel assembly; and a substantially planar web section, wherein the web section is circumferentially continuous, the web section is integrally formed to the central core and the outer rim section, the web section is substantially planar when the hub is at rest, the entire web section extends in a radial direction, and the web section has a substantially constant thickness in an axial direction.