Brushed motor and electrical product

Patent metadata

Field	Value
Publication number	US-11824420-B2
Application number	US-202217706603-A
Country	US
Kind code	B2
Filing date	Mar 29, 2022
Priority date	Mar 31, 2021
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

A brushed motor includes a shaft, an armature around the shaft, a commutator on one side of the armature in an axial direction, a brush card on one side of the commutator in the axial direction, and a housing accommodating a portion of the shaft, the armature, the commutator, and a portion of the brush card. A convex portion positions corresponding to the commutator in the axial direction on a surface of the brush card on one side facing the commutator, which has a main body portion around the shaft and a pin bent from an end of the main body portion on the other side in the axial direction toward an outer side in a radial direction and one side in the axial direction. A distance between the pin and a brush on the brush card is larger than that between the main body portion and the convex portion.

First claim

What is claimed is:

1. A brushed motor, comprising: a shaft, an armature arranged around the shaft, a commutator located on one side of the armature in an axial direction, a brush card located on one side of the commutator in the axial direction, and a tubular housing that accommodates a portion of the shaft, the armature, the commutator, and a portion of the brush card, wherein
a convex portion is arranged at a position corresponding to the commutator in the axial direction on a surface of the brush card on one side facing the commutator;
the commutator has a main body portion arranged around the shaft and a pin bent from an end of the main body portion on the other side in the axial direction toward an outer side in a radial direction and one side in the axial direction; and
a distance between the pin and a brush arranged on the brush card is larger than a distance between the main body portion and the convex portion;
wherein the number of the convex portions is at least three, and the convex portions are arranged at equal intervals along a circumferential direction.

2. The brushed motor according to claim 1 , wherein the convex portion and the brush card are integrally molded.

3. The brushed motor according to claim 1 , wherein the commutator and the convex portion are not in contact with each other when the armature is not subjected to an axial tensile force.

4. The brushed motor according to claim 1 , wherein the brush card has a first annular portion arranged around the shaft and extending along a direction perpendicular to the axial direction, and a second annular portion located on an outer periphery of the first annular portion and extending along a direction perpendicular to the axial direction; the convex portion is arranged on a surface of the first annular portion on one side facing the commutator; and a plurality of the brushes are arranged on one side of the second annular portion facing the commutator.

5. The brushed motor according to claim 4 , wherein the convex portion extends along the radial direction, and an end of the convex portion on an inner side in the radial direction and the shaft are separated by a certain distance.

6. An electrical product, comprising the brushed motor according to claim 1 .

Assignees

• Nidec Corp

Inventors

• Liu Hui
• Li Chao

Classifications

• H02K5/145 Primary

  Fixedly supported brushes or brush holders, e.g. leaf or leaf-mounted brushes · CPC title

• H01R39/38

  Brush holders · CPC title

• H02K5/143 Primary

  for cooperation with commutators · CPC title

• H02K5/148 Primary

  Slidably supported brushes · CPC title

• H02K23/00

  DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors · CPC title