Motor

Patent metadata

Field	Value
Publication number	US-10079519-B2
Application number	US-201615210340-A
Country	US
Kind code	B2
Filing date	Jul 14, 2016
Priority date	Jul 21, 2015
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

A motor may include a shaft, an armature, a commutator, a bearing, a housing, a bracket, and a brush card assembly. The brush card assembly may include a brush contacting the commutator, and a brush card holding the brush. The bracket may include a bracket bottom portion covering at least a portion of a lower side of the brush card, a cylindrical bracket cylindrical portion extending upwardly from a radially outer edge of the bracket bottom portion, a bearing holding portion extending upwardly from the bracket bottom portion at a radially inner side of the bracket cylindrical portion, and holding the bearing, and a rib positioned above the bracket bottom portion, and extending radially outward from the bearing holding portion.

First claim

What is claimed is:

1. A motor including a shaft extending in a direction parallel with a center axis extending in a vertical direction, comprising:
an armature fixed to the shaft;
a commutator fixed to the shaft and electrically connected to the armature;
a bearing supporting the shaft;
a cylindrical housing being open toward a lower side and accommodating the armature;
a cylindrical bracket positioned under the housing and fixed to the housing; and
a brush card assembly positioned between the housing and the bracket in an axial direction,
wherein the brush card assembly comprises:
a brush contacting the commutator, and
a brush card holding the brush, and

the bracket comprises:
a bracket bottom portion covering at least a portion of a lower side of the brush card,
a bracket cylindrical portion extending upwardly from a radially outer edge of the bracket bottom portion,
a bearing holding portion extending upwardly from the bracket bottom portion at a radially inner side of the bracket cylindrical portion, and holding the bearing, and
a rib positioned above the bracket bottom portion, and extending radially outward from the bearing holding portion.

2. The motor according to claim 1 ,
wherein the brush card comprises a brush card cylindrical portion enclosing the shaft in a circumferential direction,
at least a portion of the brush card cylindrical portion is arranged inside the bracket cylindrical portion, and
the brush card cylindrical portion is fitted in the bracket cylindrical portion.

3. The motor according to claim 2 ,
wherein the brush card cylindrical portion is fixed by press fitting to an inner side surface of the bracket cylindrical portion.

4. The motor according to claim 3 ,
wherein an outer side surface of the brush card cylindrical portion has a protrusion protruding outwardly in a radial direction, and
the protrusion contacts the inner side surface of the bracket cylindrical portion.

5. The motor according to claim 4 ,
wherein the bracket cylindrical portion has an inner side surface subjected to cutting.

6. The motor according to claim 1 ,
wherein the rib has a radially outer end connected to the bracket cylindrical portion.

7. The motor according to claim 6 ,
wherein the rib comprises
a first portion, and
a second portion having an upper end which is arranged below the first portion in the axial direction, and
the second portion is positioned at a radially outer end of the rib.

8. The motor according to claim 1 ,
wherein the rib of the bracket includes a plurality of ribs, and
the plurality of ribs include
a first rib and
a second rib having an upper end arranged below the first rib in the axial direction.

9. The motor according to claim 8 ,
wherein the number of ribs of the bracket is not less than four,
three of the ribs each correspond to the first rib, and
the remaining rib or ribs each have the upper end arranged below the first ribs in the axial direction.

10. The motor according to claim 1 ,
wherein the bracket comprises a mounting portion protruding downwardly from a lower surface of the bracket bottom portion,
the bracket bottom portion comprises a recess portion provided on an upper surface of the bracket bottom portion and recessed downwardly, and
at least a portion of the recess portion overlaps with the mounting portion in the axial direction.

11. The motor according to claim 1 ,
wherein the rib of the bracket includes a plurality of ribs,
the bracket bottom portion comprises a recess portion provided on an upper surface of the bracket bottom portion and recessed downwardly, and
at least a portion of the recess portion is arranged between the ribs in a circumferential direction.

12. The motor according to claim 10 ,
wherein the bracket cylindrical portion comprises a hole portion being open at the recess portion, and
the hole portion has an opening at an inner side surface of the bracket cylindrical portion and an opening at an outer side surface of the bracket cylindrical portion.

Assignees

• Nidec Corp

Inventors

• Hamagishi Kenichiro
• Kizaki Hironori

Classifications

• H02K5/173

  using bearings with rolling contact, e.g. ball bearings · CPC title

• H02K5/225

  Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132) · CPC title

• H02K5/148 Primary

  Slidably supported brushes · CPC title

• H02K5/1732

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence) · CPC title

• H02K5/145 Primary

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