Motor and manufacturing method of movement restricting structure

Patent metadata

Field	Value
Publication number	US-10411567-B2
Application number	US-201414286753-A
Country	US
Kind code	B2
Filing date	May 23, 2014
Priority date	May 23, 2013
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A motor includes a brush configured to contact a commutator and a movement restricting structure configured to restrict a movement of the brush. The movement restricting structure has: a carbon holder for housing the brush while permitting a movement of the brush in the commutator radial direction; and a circumferentially restricting part for restricting a movement of the brush in the commutator circumferential direction. The circumferentially restricting part has a passing port formed by punching, through which the brush passes.

First claim

What is claimed is:

1. A motor comprising:
a brush configured to contact a commutator; and
a movement restricting structure configured to restrict a movement of the brush, wherein
the movement restricting structure includes:
a holder for housing the brush while permitting a movement of the brush in a commutator radial direction; and
a circumferentially restricting part made from a metal plate for restricting a movement of the brush in a commutator circumferential direction, the circumferentially restricting part comprised of a base plate and a circumferentially restricting portion extending from the base plate at an approximately right angle, and wherein
a clearance between the circumferentially restricting part and the brush, extending in the commutator circumferential direction, is formed to be smaller than that between the holder and the brush, extending in the commutator circumferential direction,
the circumferentially restricting part has a passing port, through which the brush passes,
the base plate includes a plurality of inserting holes,
the holder includes a plurality of inserting portions, each inserting portion corresponding to one of the plurality of inserting holes, so that when each of the plurality of inserting portions is inserted into its corresponding one of the plurality of inserting holes the holder is retained in the base plate such that the passing port is positioned in an internal space in which a brush moves, and
the circumferentially restricting part is provided more toward the commutator than the holder.

2. The motor according to claim 1 , wherein
the passing port has a shape in which a circumference of the passing port is closed.

3. The motor according to claim 1 , wherein
the holder is a tubular member, and wherein
the circumferentially restricting part is a member having a positioning part by which the holder is positioned.

4. The motor according to claim 1 , wherein
the holder and the circumferentially restricting part are formed by a single member.

5. The motor according to claim 4 including a bent portion by which the holder and the circumferentially restricting part are connected together.

6. The motor according to claim 5 , wherein
the bent portion is connected to a side wall of the holder.

7. The motor according to claim 1 , wherein the width of the brush is constant.

8. A motor, comprising:
a brush configured to contact a commutator; and
a movement restricting structure configured to restrict a movement of the brush, wherein
the movement restricting structure includes:
a holder for housing the brush while permitting a movement of the brush in a commutator radial direction; and
a circumferentially restricting part for restricting a movement of the brush in a commutator circumferential direction, and wherein
the circumferentially restricting part has a passing port through which the brush passes, wherein
a clearance between the circumferentially restricting part and the brush, extending in the commutator circumferential direction, is formed to be smaller than that between the holder and the brush, extending in the commutator circumferential direction,
the circumferentially restricting part is provided more toward the commutator than the holder,
the circumferentially restricting part is a plate-shaped member in which the passing port is formed, and wherein
an insertion hole, into which the circumferentially restricting part is inserted, is formed in the holder such that the passing port is positioned in an internal space in which a brush moves.

9. A motor comprising:
a brush configured to contact a commutator; and
a movement restricting structure configured to restrict a movement of the brush, wherein the movement restricting structure is directly fixed to a brush-holder, wherein
the movement restricting structure includes:
a holder for housing the brush while permitting a movement of the brush in a commutator radial direction; and
a circumferentially restricting part made from a metal plate for restricting a movement of the brush in a commutator circumferential direction, the circumferentially restricting part comprised of a base plate and a circumferentially restricting portion extending from the base plate at an approximately right angle, and
wherein the circumferentially restricting part has a passing port, through which the brush passes,
a clearance between the circumferentially restricting part and the brush, extending in the commutator circumferential direction, is formed to be smaller than that between the holder and the brush, extending in the commutator circumferential direction,
the base plate includes a plurality of inserting holes,
the holder includes a plurality of inserting portions, each inserting portion corresponding to one of the plurality of inserting holes, so that when each of the plurality of inserting portions is inserted into its corresponding one of the plurality of inserting holes the holder is retained in the base plate such that the passing port is positioned in an internal space in which a brush moves, and
the circumferentially restricting part is provided more toward the commutator than the holder.

Assignees

• Mabuchi Motor Co

Inventors

• Yoshida Atsushi
• Ogino Hisashi

Classifications

• H02K5/148

  Slidably supported brushes · CPC title

• H01R39/40 Primary

  enabling brush movement within holder during current collection · CPC title

• H02K15/00

  Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines · CPC title

• Y10T29/49011

  Commutator or slip ring assembly · CPC title

• H02K13/00 Primary

  Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings (supporting or protecting brushes or brush holders in motor casings or enclosures H02K5/14); Disposition of current collectors in motors or generators; Arrangements for improving commutation · CPC title