Bearing assembly for an ultra quiet electric motor
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A high speed electric motor for automotive applications that is designed to effectively minimize vibration of its component parts and thus suppress noise generated during its operation. The motor incorporates acoustic engineering principles including surface vibration control, acoustic radiation efficiency, active intensity field control and noise control using acoustic materials to reduce overall vibration of the motor components and the motor noise sensed by the passenger of the vehicle. In one aspect, a bearing assembly for an electric motor is disclosed. The electric motor is 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 includes a bearing member for supporting the armature shaft for rotational movement and a bearing housing defining an internal bore that accommodates at least a portion of the bearing member. The bearing housing may comprise a vibration energy absorbing material, and is 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.
52 Citations
16 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- and magnet means for inducing rotational movement of the armature shaft, the bearing assembly comprising;
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8. An electric motor for automotive applications and characterized by exhibiting minimal acoustic noise radiation, which comprises:
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a housing having end portions and defining an internal chamber; an armature disposed within the internal chamber and having an armature shaft and an armature core; and a sleeve bearing assembly mounted adjacent one of the housing end portions for supporting the armature shaft for rotational movement within the housing, the sleeve bearing assembly including; a sleeve bearing member defining an opening that receives an end portion of the armature shaft; and a sleeve bearing housing, including; a base defining a central axis and having an internal bore for accommodating the bearing member 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; and a plurality of mounting projections extending in a generally axial direction from the base, the mounting projections arranged to surround at least a portion of the bearing member to facilitate retention of the bearing member within the internal bore; an end cap to house the sleeve bearing assembly, the end cap being coupled to the one housing end portion; and a noise absorbing member located internally of the end cap and disposed between the sleeve bearing assembly and the armature core of the armature and generally adjacent to at least a portion of the end cap, the noise absorbing member being constructed and arranged to absorb noise from the sleeve bearing assembly to substantially acoustically isolate the sleeve bearing assembly from the armature. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An electric motor for automotive applications and characterized by exhibiting minimal acoustic noise radiation, which comprises:
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a housing having end portions and defining an internal chamber; an armature disposed within the internal chamber and having an armature shaft and an armature core; and a sleeve bearing assembly mounted adjacent one of the housing end portions for supporting the armature shaft for rotational movement within the housing, the sleeve bearing assembly including; a sleeve bearing member defining an opening that receives an end portion of the armature shaft; and a sleeve bearing housing, including; a base defining a central axis and having an internal bore for accommodating the bearing member 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; a plurality of mounting projections extending in a generally axial direction from the base, the mounting projections being constructed and arranged to surround at least a portion of the bearing member to facilitate retention of the bearing member within the internal bore, said base including arcuate grooves defined in an external surface thereof and circumferentially adjacent an outer peripheral surface of a protection; and a retainer member engaged with the one housing end portion and being at least partially accommodated within the arcuate grooves of the base for retaining the sleeve bearing housing within the one housing end portion.
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Specification