US 11,942,740 B2
Motor having columnar brush
Mikio Umehara, Yonago (JP); Atsushi Omura, Matsue (JP); and Kazuaki Sato, Yonago (JP)
Assigned to Minebea Mitsumi Inc., Kitasaku-gun (JP)
Filed by MINEBEA MITSUMI INC., Nagano (JP)
Filed on Jun. 4, 2021, as Appl. No. 17/339,469.
Application 17/339,469 is a division of application No. 16/417,053, filed on May 20, 2019, granted, now 11,063,400.
Claims priority of application No. 2018-098243 (JP), filed on May 22, 2018.
Prior Publication US 2021/0296835 A1, Sep. 23, 2021
Int. Cl. H01R 39/38 (2006.01); H02K 5/14 (2006.01); H02K 5/22 (2006.01); H02K 13/10 (2006.01)
CPC H01R 39/38 (2013.01) [H02K 5/145 (2013.01); H02K 5/225 (2013.01); H02K 13/10 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A motor comprising:
a rotation axis;
a frame;
an annular magnet attached to the inner surface of the frame;
a bracket provided at the frame, the bracket comprising an outer peripheral portion, a recess portion inside the outer peripheral portion, a protruding portion and a wall portion, the protruding portion and the wall portion being arranged at the recess portion;
a columnar brush having an outer peripheral surface;
a commutator contacting the outer peripheral surface of the brush;
a terminal portion; and
an elastic member supporting the brush at the bracket,
wherein:
the elastic member includes a first extending portion, a second extending portion and a coil portion between the first extending portion and the second extending portion,
a part of the second extending portion of the elastic member is inside the brush,
the first extending portion is fixed to the terminal portion, the wall portion is arranged between a part of the columnar brush contacting the commutator and a part of the first extending portion fixed to the terminal portion from the first extending portion toward the second extending portion,
the protruding portion is arranged inside the coil portion,
the outer peripheral surface of the brush is cylindrical in shape,
the second extending portion of the elastic member penetrates through the brush in an axial direction of the columnar brush, and
the wall portion includes a surface facing the columnar brush across space around a central axis of the coil portion.