Power tool with compact motor assembly
AssigneeBlack & Decker Inc.
InventorsDavid J. Smith, Justin H. Ayers, Abraham Sanchez
Life of this patent
Estimating the term…
Abstract
A power tool is provided including a tool housing; a rear tool cap separately formed from the tool housing and mounted on a rear end of the tool housing; and a motor. The motor includes a stator, a rotor shaft; a rear bearing mounted on the rotor shaft and supported by a central bearing pocket of the rear tool cap, and a rotor. The rear tool cap further comprises a constraining member extending from the radial body, where the constraining member is configured to engage a portion of the stator to securely locate the stator within the tool housing and pilot the rear bearing relative to the stator independently of the tool housing.
Claims20
A power tool comprising:
- a tool housing;
- a rear tool cap separately formed from the tool housing and mounted on a rear end of the tool housing, the rear tool cap comprising a radial body having a first surface facing away from the tool housing and being contactable by a user, a second surface opposite the first surface, a peripheral portion that mates with the rear end of the tool housing, and a central bearing pocket formed on or within the second surface of the radial body;
- and
- a brushless direct-current (BLDC) motor received within the housing, comprising:
- a stator including a stator core, a plurality of stator teeth radially extending from the stator core and defining a plurality of slots therebetween, and a plurality of stator windings wound around the plurality of stator teeth;
- a rotor shaft extending along a longitudinal axis;
- a rear bearing mounted on the rotor shaft and supported by the central bearing pocket of the rear tool cap;
- and
- a rotor comprising a rotor core mounted on the rotor shaft to rotate relative to the stator,
- wherein the rear tool cap further comprises a constraining member extending from the radial body, the constraining member being configured to engage a portion of the stator to securely locate the stator within the tool housing and pilot the rear bearing relative to the stator independently of the tool housing.
A power tool comprising:
- a tool housing;
- a rear tool cap formed or mounted on a rear end of the tool housing, the rear tool cap comprising a radial body having a first surface facing away from the tool housing and being contactable by a user, a second surface opposite the first surface, and an annular bearing pocket extending from the second surface of the radial body;
- and
- a brushless direct-current (BLDC) motor received within the housing, comprising:
- a stator including a stator core, a plurality of stator teeth radially extending from the stator core and defining a plurality of slots therebetween, and a plurality of stator windings wound around the plurality of stator teeth;
- a rotor shaft extending along a longitudinal axis;
- a rear bearing mounted on the rotor shaft and supported by the annular bearing pocket of the rear tool cap;
- and
- a rotor comprising a rotor core mounted on the rotor shaft within the stator and at least one magnet mounted around the rotor core, the rotor core defining an annular recess within which at least a portion of the rear bearing and a portion of the annular bearing pocket are located such that the a radial plane intersecting the rear bearing also intersects the at least one magnet and the stator core.
Dependencies are inferred from the claim text.