Internal support interface between a shaft and housing member with vibration and acoustic isolation
View Patent ↗An internal support interface which provides vibration and acoustic isolation. A stationary shaft has a medial portion about which a rotatable member rotates. An end portion of the shaft has an annular base surface surrounding a stub shaft projection. A substantially planar housing member has a support post which extends from an annular interior surface in adjacent, non-contacting proximity to the stub shaft projection to form a gap therebetween. An annular damping member mutually contactingly surrounds the stub shaft projection and the support post while being compressed between the base surface of the shaft and the interior surface of the housing member.
1. An internal support interface comprising:
a stationary shaft comprising a medial portion about which a rotatable member rotates, and an end portion comprising an annular base surface surrounding a stub shaft projection;
a substantially planar housing member comprising a support post extending from an interior surface, the support post in adjacent, non-contacting proximity to the stub shaft projection to form a gap therebetween; and
an annular damping member which mutually contactingly surrounds the stub shaft projection and the support post while being compressed between the base surface of the shaft and the interior surface of the housing member.
2. The interface of claim 1 , wherein the interior surface of the housing member forms an annular groove which surrounds the support post, wherein the annular damping member is disposed within the annular groove, and wherein the annular groove further comprises an outer sidewall in facing relation to the support post against which the damping member is contactingly compressed.
3. The interface of claim 2 , wherein the selected end of the shaft further comprises an annular support barrier which surrounds the stub shaft projection to form a second annular groove therebetween, and wherein the damping member is further contactingly compressed against said second annular groove.
4. The interface of claim 1 , wherein the annular base surface forms an annular groove which surrounds the stub shaft projection, wherein the annular damping member is disposed within the annular groove, and wherein the annular groove further comprises an outer sidewall in facing relation to the stub shaft projection against which the damping member is contactingly compressed.
5. The interface of claim 1 , wherein the damping member is characterized as an elastomeric o-ring with a central aperture into which the stub shaft projection and the support post respectively extend from opposing directions thereof.
6. The interface of claim 1 , wherein the stub shaft projection comprises a substantially planar first facing surface surrounded by a tapered surface that extends from the first facing surface to the base surface.
7. The interface of claim 6 , wherein the support post comprises a substantially planar second facing surface surrounded by a sidewall surface that extends from the second facing surface to the interior surface, and wherein the first and second facing surfaces are nominally equal in areal extent.
8. The interface of claim 1 , wherein the damping member is characterized as a first damping member, and wherein the interface further comprises a second damping member compressed by the first damping member, the second damping member having a durometer lower than a durometer of the first damping member.
9. The interface of claim 8 , wherein the second damping member is disposed between the first damping member and the interior surface of the housing member.
10. The interface of claim 8 , wherein the second damping member is disposed between the first damping member and the base surface of the shaft.
11. The interface of claim 1 , wherein the end portion of the stationary shaft is characterized as a first end, wherein the stationary shaft comprises a second end opposite the first end comprising a second annular base surface surrounding a second stub shaft projection, and wherein the interface further comprises:
a second substantially planar housing member comprising a second support post extending from a second annular interior surface, the second support post in adjacent, non-contacting proximity to the second stub shaft projection to form a second gap therebetween; and
a second annular damping member which mutually contactingly surrounds the second stub shaft projection and the second support post while being compressed between the second base surface of the shaft and the second interior surface of the housing member.
12. The interface of claim 1 , wherein the planar housing member forms a portion of a housing of a data storage device.
13. The interface of claim 12 , wherein the rotatable member comprises a hub of a spindle motor which rotatably supports a rotatable storage medium.
14. The interface of claim 12 , wherein the rotatable member comprises an actuator which supports a transducer adjacent a storage medium.
15. The interface of claim 12 , wherein the housing is hermetically sealed to retain an inert gas atmosphere.
16. An internal support interface comprising:
a stationary shaft configured to support a rotatable member for rotation about a central axis; and
first means for supporting a selected end of the shaft with respect to a housing member to provide relatively higher mechanical compliance in a direction along the central axis and relatively lower mechanical compliance in a direction along a plane normal to the central axis, wherein the first means comprises an annular damping member which mutually contactingly surrounds a stub shaft projection of the shaft and a support post extending from the housing member while being compressed between a base surface of the shaft and an interior surface of the housing member.
17. The interface of claim 16 , wherein the damping member is characterized as a first damping member, and wherein the first means further comprises a second damping member compressed by the first damping member, the second damping member having a durometer lower than a durometer of the first damping member.
18. The interface of claim 16 , wherein the damping member is characterized as an elastomeric o-ring with a central aperture into which the stub shaft projection and the support post respectively extend from opposing directions thereof.
19. The interface of claim 16 , wherein the stub shaft projection comprises a substantially planar first facing surface surrounded by a tapered surface that extends from the first facing surface to the base surface, wherein the support post comprises a substantially planar second facing surface surrounded by a sidewall surface that extends from the second facing surface to the interior surface, and wherein the first and second facing surfaces are nominally equal in areal extent.