Brush holder component with ground contact plate
AssigneeRobert Bosch GmbH
InventorsAndreas Grimm, Ilya Kuperberg, Robert Heitz, Jens Maerkle
Life of this patent
Estimating the term…
Abstract
Electric motor, as well as a brush mount component (34) for positioning of carbon brushes with respect to a commutator (30) of an electric motor (12), having at least one attachment means (55) for fixing the brush mount component (34) on a printed circuit board (28), with an earth contact plate (70) being mounted on the brush mount component (34) and being designed symmetrically with respect to the arrangement of the carbon brushes (32). A method for production of an electric motor such as this is also described.
Claims17
A brush holder component (34) for positioning carbon brushes relative to a commutator (30) of an electric motor (12), comprising:
- at least one fastening means (55) for fixing the brush holder component (34) on a printed circuit board (28);
- and
- a ground contact plate (70), embodied symmetrically to the arrangement of carbon brushes (32), located on the brush holder component (34),
- wherein the ground contact plate (70) has an axial end wall (71) with a recess (69) for an armature shaft (14) and two angled leg sides (73) that together surround the carbon brushes (32), wherein the ground contact plate is configured to efficiently suppress electromagnetic interferences produced by a brush fire of the carbon brushes.
A method for producing an electric motor (12), in which an armature shaft (14), with a commutator (30) and a brush holder component (34), is received by a housing part (18, 20), comprising the following steps:
- placing a shielding plate (76) radially in the housing part (20) and connecting said shielding plate (76) symmetrically to a pole housing (16);
- inserting the armature shaft (14), with the commutator (30) supported on it, into the housing part (20);
- slipping a ground contact plate (70) onto the brush holder component (34);
- electrically contacting the ground contact plate (70) to the printed circuit board (28), and mechanically connecting the brush holder component (34) to the printed circuit board (28);
- mounting the printed circuit board (28) with the brush holder component (34) in the radial direction (36) in the housing part (20), in the process of which the ground contact plate (70) is pressed with symmetrically arranged spring tongues (74) against corresponding stop faces (75) of the shielding plate (76);
- and
- radially joining a housing cap to the housing part (20).
Dependencies are inferred from the claim text.