Commutator motor with a retention device for retaining a brush during assembly
AssigneeSiemens Aktiengesellschaft
InventorsDagmar Steinbart, Werner Seuffert
Life of this patent
Estimating the term…
Abstract
An axially movable protective sleeve is provided for the axial assembly of a rotor-side commutator onto a stator-side brush holder. The protective sleeve both protects against moisture and provides an axial assembly that is simple in production. The axially movable protective sleeve encircles a commutator, and initially secures brushes in a retention position for assembly and then releases the brushes to rest on a brush contact surface of the commutator, when the commutator is in its operational end position.
Claims22
A commutator motor comprising:
- a brush holder having a brush carrier plate;
- a commutator having a brush contact surface, said commutator and said brush holder having a mutual end position;
- a plurality of brushes positioned in said brush holder;
- and
- a protective sleeve that is guidably held on an apical face of said brush carrier plate, said protective sleeve encircling said brush contact surface at a first radial distance and comprising a cover area having a plurality of plug-through openings for said plurality of brushes;
- wherein said protective sleeve is axially movable from a retention position for assembly and an operational final position, wherein said protective sleeve secures said plurality of brushes in the retention position at a second radial distance from said brush contact surface during mutual axial assembly of said commutator and said brush holder, and upon said commutator reaching the mutual end position, said protective sleeve is axially moved to the operational final position and releases said plurality of brushes to extend through said plurality of plug-through openings to contact said brush contact surface.
A protective sleeve comprising:
- a guidance-fixation area for guiding and fixing said protective sleeve on a brush holder, said guidance-fixation area having a first radius;
- a retention area for retaining brushes during assembly of a commutator to a brush holder, said retention area having a second radius, and said retention area being adjacent to said guidance-fixation area and stepped radially outward relative to said guidance-fixation area;
- and
- a cover area having a plurality of plug-through openings and being adjacent and radially flush to said retention area, said cover area having a third radius that is larger than said first radius and said second radius.
A brush holder arrangement comprising:
- a brush carrier plate;
- a plurality of brushes that are held on a face of said brush carrier plate movably between an assembly position and an operational position;
- and
- a protective sleeve comprising:
- a first area that secures said protective sleeve to said brush carrier plate, said first area having a first radius;
- a second area that holds said plurality of brushes in the assembly position, said second area having a second radius;
- and
- a third area having a plurality of openings for said plurality of brushes in the operational position, said third area having a third radius that is larger than the first radius and the second radius.
Dependencies are inferred from the claim text.