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Bearing assembly for an ultra quiet electric motor

  • US 5,917,258 A
  • Filed: 10/08/1997
  • Issued: 06/29/1999
  • Est. Priority Date: 10/08/1997
  • Status: Expired due to Fees
First Claim
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1. A bearing assembly for an electric motor of the type including a housing defining an internal chamber, an armature disposed within the internal chamber and having a rotatable shaft;

  • and magnet means for inducing rotational movement of the armature shaft, the bearing assembly comprising;

    an end cap;

    a bearing member for supporting the armature shaft for rotational movement;

    a bearing housing disposed internally of said end cap and having a base surface and side surfaces, said bearing housing defining an internal bore that accommodates at least a portion of the bearing member, the bearing housing comprising a vibration energy absorbing material, and being dimensioned such that an inner wall portion of the bearing housing defining the internal bore is in contacting engagement with an outer surface of the bearing member to facilitate absorption of vibration energy from the bearing member;

    energy absorbing material between said end cap and said bearing housing and at least partially surrounding said base surface and side surfaces of the bearing housing to dampen residual acoustic energy; and

    a noise absorbing member located internally of the end cap with said bearing member being disposed between said energy absorbing material and said noise absorbing member to substantially acoustically isolate the bearing member.

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