Ultra quiet electric motor for automotive applications
First Claim
Patent Images
1. An electric motor for automotive applications that exhibits minimal acoustic noise radiation, which comprises:
- a housing having front and rear ends, and an internal chamber;
an armature shaft;
an end cap mounted adjacent the rear end of the housing to substantially enclose the internal chamber of the housing, the end cap comprising;
a hub extending radially outwardly with respect to a cylindrical section of said housing, anda stamped pattern including a series of alternating axial raised portions and depression portions located in an inner peripheral surface of said hub;
a brush card assembly proximate the end cap, the brush card assembly including a brush card mount and a brush card supported by the brush card mount; and
at least one bearing assembly including;
a bearing member that supports an end portion of the armature shaft; and
a bearing housing having an internal bore defining a receiving wall portion to accommodate at least a portion of the bearing member, the bearing housing being dimensioned such that the receiving wall portion of the bearing housing is in contacting engagement with an outer surface of the bearing member to facilitate absorption of vibration energy from the bearing.
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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.
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Citations
20 Claims
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1. An electric motor for automotive applications that exhibits minimal acoustic noise radiation, which comprises:
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a housing having front and rear ends, and an internal chamber; an armature shaft; an end cap mounted adjacent the rear end of the housing to substantially enclose the internal chamber of the housing, the end cap comprising; a hub extending radially outwardly with respect to a cylindrical section of said housing, and a stamped pattern including a series of alternating axial raised portions and depression portions located in an inner peripheral surface of said hub; a brush card assembly proximate the end cap, the brush card assembly including a brush card mount and a brush card supported by the brush card mount; and at least one bearing assembly including; a bearing member that supports an end portion of the armature shaft; and a bearing housing having an internal bore defining a receiving wall portion to accommodate at least a portion of the bearing member, the bearing housing being dimensioned such that the receiving wall portion of the bearing housing is in contacting engagement with an outer surface of the bearing member to facilitate absorption of vibration energy from the bearing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electric motor for automotive applications that exhibits minimal acoustic noise radiation, which comprises:
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a housing having front and rear ends, and an internal chamber; an armature shaft; an end cap mounted adjacent the rear end of the housing to substantially enclose the internal chamber of the housing, the end cap having a stamped pattern including at least one raised portion configured to minimize vibration energy transfer, the end cap including a main portion and a peripheral lip portion extending in an axial direction from the main portion, the main portion having the stamped pattern; and a brush card assembly proximate the end cap, the brush card assembly including a brush card mount and a brush card supported by the brush card mount; and at least one bearing assembly including; a bearing member that supports an end portion of the armature shaft; and a bearing housing having an internal bore defining a receiving wall portion to accommodate at least a portion of the bearing member, the bearing housing being dimensioned such that the receiving wall portion of the bearing housing is in contacting engagement with an outer surface of the bearing member to facilitate absorption of vibration energy from the bearing, wherein the brush card mount is at least partially disposed within the peripheral lip portion of the end cap and in contacting engagement therewith, the brush card mount comprising a vibration energy absorbing material to thereby absorb vibration energy from the end cap. - View Dependent Claims (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 a closed housing end portion and an open housing end portion, and an internal chamber; an armature disposed within the internal chamber and having an armature shaft and an armature core; an end cap mounted to the open housing end portion, the end cap including a main portion and a peripheral lip portion extending in a general axial direction from the main portion, the main portion having a stamped pattern including at least one raised portion configured to minimize vibration energy transfer; a brush card assembly including a brush card mount and a brush card supported by the brush card mount, the brush card mount being at least partially disposed within the peripheral lip portion of the end cap and in contacting engagement therewith, the brush card mount comprising a vibration energy absorbing material to thereby absorb vibration energy carried by the end cap; first and second bearing assemblies for supporting the armature shaft for rotational movement, the first bearing assembly disposed adjacent the closed housing end portion and the second bearing assembly disposed adjacent the end cap, each bearing assembly including a bearing member and a bearing housing having 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 portions of the bearing housing defining the internal bore are in contacting engagement with an outer surface of the bearing member to facilitate absorption of vibration energy from the sleeve member bearing; a noise absorbing member disposed between each bearing assembly and the armature core of the armature, the noise absorbing member adapted to absorb noise from the respective bearing assembly to substantially acoustically isolate the respective housing end portion; and an anti-vibration washer mounted to the armature shaft adjacent each bearing assembly, the anti-vibration washer configured to absorb energy transferred along the armature shaft. - View Dependent Claims (17, 18, 19, 20)
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Specification