Compressive spring sleeve for reducing disc slippage

A disc drive, comprising:

• a basedeck;
• and
• a data storage disc stack mounted to the basedeck and comprising:
• a spindle motor having a rotatable spindle motor hub with an outer diameter;
• a pair of discs and a spacer alternately stacked about the spindle motor hub and having respective inner diameters greater than the outer diameter of the spindle motor hub, the spacer disposed between the discs to establish a desired inter-disc spacing;
• a disc clamp exerting an axial clamping force upon the discs and disc spacer;
• and
• a compressive spring sleeve interposed between the inner diameters of the discs and spacer and the outer diameter of the spindle motor hub to pressingly engage the spacer to exert an outward radial force onto the spacer without contacting the discs, the outward radial force operating in conjunction with friction between the discs and the spacer induced by the axial clamping force to maintain the discs in a concentric relationship with the spindle motor hub in response to application of a non-operational shock to the disc drive.

A disc stack for use in a data storage disc drive, comprising:

• a spindle motor having a rotatable spindle motor hub with an outer diameter;
• a pair of discs and a spacer alternately stacked about the spindle motor hub and having respective inner diameters greater than the outer diameter of the spindle motor hub, the spacer disposed between the discs to establish a desired inter-disc spacing;
• a disc clamp exerting an axial clamping force upon the discs and disc spacer;
• and
• a compressive spring sleeve interposed between the inner diameters of the discs and spacer and the outer diameter of the spindle motor hub to pressingly engage the spacer without contacting the discs to exert an outward radial force onto the spacer, the outward radial force operating in conjunction with friction between the discs and the spacer induced by the axial clamping force to maintain the discs in a concentric relationship with the spindle motor hub in response to application of a non-operational shock to the disc stack.