Power tool including hybrid electric motor design
AssigneeTechtronic Power Tools Technology Limited
InventorsRoger G. Satterfield, Stephen C. Hembroff
Life of this patent
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Abstract
An electric motor for use with a power tool includes a motor housing having a first end and an open second end, a first bearing coupled to the first end of the motor housing, a plurality of magnets coupled to the motor housing, and an armature having a first end and a second end. The first end of the armature is rotatably supported by the first bearing. The second end of the armature protrudes from the open second end of the motor housing without being supported by the open second end of the motor housing. The electric motor also includes a second bearing coupled to the second end of the armature. The motor housing is supportable by a first portion of the power tool housing. The second bearing is supportable by a second portion of the power tool housing.
Claims16
An electric motor for use with a power tool including a power tool housing, the power tool housing including a first portion and a second portion, the electric motor comprising:
- a motor housing having a first end and an open second end;
- a first bearing coupled to the first end of the motor housing and at least partially disposed within the motor housing;
- a plurality of magnets coupled to the motor housing;
- an armature having a first end and a second end, the first end of the armature being rotatably supported by the first bearing, the second end of the armature protruding from the open second end of the motor housing without being supported by the open second end of the motor housing;
- a second bearing coupled to the second end of the armature;
- a brush assembly supportable by the power tool housing and positioned outside the motor housing between the open second end of the motor housing and the second end of the armature;
- and
- a fan coupled for co-rotation with the armature, the fan positioned outside the motor housing between the open second end of the motor housing and the brush assembly;
- wherein the fan includes a plurality of blades having respective blade tips that circumscribe an outer diameter of the fan, wherein the outer diameter of the fan is greater than or equal to an outer diameter of the motor housing;
- wherein the motor housing is supportable by the first portion of the power tool housing, and wherein the second bearing is captured within a receptacle in the second portion of the power tool housing.
A power tool comprising:
- a power tool housing;
- a motor housing supported by a first portion of the power tool housing, the motor housing having a first end and an open second end;
- a first bearing coupled to the first end of the motor housing and at least partially disposed within the motor housing;
- a plurality of magnets coupled to the motor housing;
- an armature having a first end and a second end, the first end of the armature being rotatably supported by the first bearing, the second end of the armature protruding from the open second end of the motor housing without being supported by the open second end of the motor housing;
- a second bearing coupled to the second end of the armature and captured within a receptacle in a second portion of the power tool housing;
- a brush assembly supported by the power tool housing and positioned outside of the motor housing between the open second end of the motor housing and the second end of the armature;
- and
- a fan coupled for co-rotation with the armature, the fan positioned outside the motor housing between the open second end of the motor housing and the brush assembly;
- wherein the fan includes a plurality of blades having respective blade tips that circumscribe an outer diameter of the fan, and wherein the outer diameter of the fan is greater than or equal to an outer diameter of the motor housing.
Dependencies are inferred from the claim text.