초록 ▼

A motor assembly for driving a working element of a power tool which is provided includes first and second clamshell housing members connectable to define an interior space for the power tool motor and a longitudinal axis extending through the interior space. An armature includes a core and a rotata

A motor assembly for driving a working element of a power tool which is provided includes first and second clamshell housing members connectable to define an interior space for the power tool motor and a longitudinal axis extending through the interior space. An armature includes a core and a rotatable shaft for driving a working element of the tool. The armature is mountable in the interior space with the rotatable shaft aligned along the longitudinal axis. A cylindrical stator yoke is mountable in the interior space about the longitudinal axis to encircle the armature. Top and bottom bearings are mounted on corresponding ends of the armature shaft. Alignment and support members on the first and second housing members are provided with the alignment and support members capturing and fixing the yoke and top and bottom bearings in the interior space in alignment about the longitudinal axis when the clamshell housing members are connected to each other.

대표청구항 ▼

A power tool motor assembly including a housing and a motor drive in the housing for driving a working element of the power tool with the assembly adapted to allow for easy and accurate orientation and coordination of the alignment of components of the motor drive relative to each other in the power

A power tool motor assembly including a housing and a motor drive in the housing for driving a working element of the power tool with the assembly adapted to allow for easy and accurate orientation and coordination of the alignment of components of the motor drive relative to each other in the power tool housing, the assembly comprising: first and second clamshell housing members of the housing which are connectable to each other to define an interior space for the power tool motor and a longitudinal axis extending through the interior space; an armature having core windings and a rotatable shaft for driving the working element of the tool and being mountable in the interior space with the rotatable shaft aligned along the longitudinal axis; a substantially cylindrical stator yoke having permanent magnets pressed therein and mountable in the interior space about the longitudinal axis to encircle the armature; top and bottom bearings mounted on corresponding ends of the armature shaft; a substantially cylindrical commutator mounted on the armature shaft over the armature core; a rectifier electrically connected to an AC power source for converting AC power to DC power; brush assemblies including brush holders and brushes therein electrically connected between the rectifier and commutator for supplying DC power from the rectifier to the commutator; a support plate including a central commutator receiving space with the support plate retaining the rectifier and fixedly retaining the brush holders and their internal brushes oppositely to each other about the central space and mountable in a separation of 180°about the longitudinal axis with the brushes in contact with the commutator; and alignment and support members on the first and second housing members with the alignment and support members including arcuate ledges for clampingly capturing and fixing the stator yoke in the housing interior space and bearing engaging members which form pockets for capturing the top and bottom bearings in the interior space in alignment about the longitudinal axis when the clamshell housing members are connected to each other, the members further including ribs for engaging and mounting the support plate to orient both the rectifier and brush assemblies in close proximity to the commutator about the longitudinal axis with the brushes in contact with the commutator and spaced from each other by 180°around the cylindrical commutator, wherein the arcuate ledges, pockets and ribs are oriented in the connected housing members so that the relative position between the yoke, armature, commutator and support plate are easily and accurately coordinated for proper electrical functioning of the motor assembly when the motor assembly is captured in the housing interior space.