Electric motor end cap having dust passage
AssigneeGraco Minnesota Inc.
InventorMichael J. Lupelow
Life of this patent
Estimating the term…
Abstract
A motor end cap for a brushed direct current (DC) electric motor includes dust passages extending therethrough that facilitate dust migration out of the motor. The brush dust migrates from an interior of the motor to outside of the motor at least partially through the dust passages formed in the motor end cap.
Claims28
An end cap for a motor housing of an electric motor, the end cap comprising:
- a cap body having an inner side and an outer side, the cap body disposed about a cap axis and at least partially defining a cap cavity on an interior of the cap body;
- and
- a dust passage extending between the cap cavity and the outer side, the dust passage configured to permit dust to migrate from out of the interior of the cap body through the dust passage.
(canceled)
12-14. (canceled)
(canceled)
-25. (canceled)
-32. (canceled)
The end cap of claim 27, wherein:
- the first subset of dust passages is circumferentially spaced from the second subset of dust passages by a first circumferential gap and a second circumferential gap;
- and
- the first circumferential gap is axially aligned with a axial plane through a first brush passage formed in the cap body, the first brush passage configured to at least partially receive a first conductive brush.
-36. (canceled)
-43. (canceled)
An end cap for a motor housing of an electric motor, the end cap comprising:
- a cap body comprising:
- an inner side;
- an outer side;
- an inner collar at least partially defining a commutator cavity configured to at least partially surround a commutator of the electric motor;
- and
- an outer collar disposed radially outward from the inner collar;
- and
- a dust passage extending at least partially within the inner collar and from the commutator cavity to the outer side, the dust passage defining a flowpath for brush dust to migrate from the commutator cavity to the outer side.
-61. (canceled)
A brushed direct current electric motor comprising:
- a drive shaft configured to rotate on a motor axis;
- a commutator mounted on the drive shaft;
- at least one conductive brush in contact with the commutator, the commutator configured to rotate relative to the conductive brush;
- and
- a motor housing at least partially surrounding the commutator and the drive shaft, the motor housing including:
- a wall unit, the wall unit having a first seal;
- an end cap disposed at an end of the wall unit;
- and
- at least one dust passage;
- wherein a commutator cavity exists radially inward of the motor housing and outward of the commutator and axially between the first seal and the second seal, and the at least one dust passage allows passage of dust from the conductive brush to escape from the commutator cavity to outside of the motor housing.
Dependencies are inferred from the claim text.