Abstract: A by-pass vacuum motor assembly wherein the motor cooling fan is positioned in an opening at the bottom of the motor band and immediately above a flat plate portion of the fan housing bracket. The flat plate portion functions as a plate diffuser, redirecting air drawn through the commutator end bracket and across the motor internals into a radial exhaust between a bottom portion of the band and a top portion of the fan end bracket. The invention also includes a brush holder clip passing through a vertical opening in the commutator end bracket and engaging a collar on the brush mechanism. The brush mechanism passes through a horizontal opening in the commutator end bracket which intersects with the vertical opening. Armature grounding is achieved by a disk maintained in a recess in the commutator end bracket and urged by a spring against the bearing receiving the motor shaft.

Abstract: A motor cooling fan housing for a by-pass vacuum motor is presented. The fan housing includes a top plate connected to a cylindrical side portion. The top plate is characterized by a plurality of uniformly spaced tear-drop shaped slots therein. The slots provide for the entry of cooling air to the motor maintained therein. The slots are elongated and have a major axis which is non-collinear with the center point of the top plate of the housing.

Abstract: A quiet by-pass vacuum motor wherein a ring-like cavity is defined between inner and outer walls of the housing for a working air fan. Separating members divide the cavity into passageways which communicate with openings in the housing. A plate having a plurality of vanes thereon is received upon the separating members, the plate extending from the outer wall to a position short of the inner wall. A baffle plate is then received upon the vanes. Working air is exhausted over the baffle plate, between the vanes, over the plate and between the separating members and through the openings. The exhaust path greatly reduces the noise level of the vacuum motor.

Abstract: A by-pass vacuum motor assembly wherein the motor cooling fan is positioned in an opening at the bottom of the motor band and immediately above a flat plate portion of the fan housing bracket. The flat plate portion functions as a plate diffuser, redirecting air drawn through the commutator end bracket and across the motor internals into a radial exhaust between a bottom portion of the band and a top portion of the fan end bracket. The invention also includes a brush holder clip passing through a vertical opening in the commutator end bracket and engaging a collar on the brush mechanism. The brush mechanism passes through a horizontal opening in the commutator end bracket which intersects with the vertical opening. Armature grounding is achieved by a disk maintained in a recess in the commutator end bracket and urged by a spring against the bearing receiving the motor shaft.