Inner-rotor motor

Patent metadata

Field	Value
Publication number	US-11764637-B2
Application number	US-202117455679-A
Country	US
Kind code	B2
Filing date	Nov 19, 2021
Priority date	Dec 25, 2015
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

An inner-rotor motor including: an armature assembly including a rotating shaft, an armature unit coupled to the rotating shaft and a pressing unit; a frame assembly including a frame housing the armature unit, a first bearing unit located on one side with respect to the armature unit in an axial direction, and a second bearing unit located on another side with respect to the armature unit in the axial direction; and an urging structure that urges the rotating shaft in a direction away from the second bearing unit and that presses the pressing unit toward the first bearing unit.

First claim

What is claimed is:

1. A motor comprising:
a rotating shaft; and
an armature unit; and
a frame housing the armature unit; and
a plate; and
a bracket attached to the plate;
a first bearing unit located on one side with respect to the armature unit in an axial direction; and
a second bearing unit located on another side with respect to the armature unit in the axial direction; and
a commutator fixed at a part of the rotating shaft between the second bearing unit and the armature unit;
a brush coupled to the bracket;
a first sliding washer arranged between the second bearing unit and the commutator, and rotatable around the rotating shaft with respect to the second bearing unit; and
a spring arranged between the commutator and the second bearing unit in an axis direction of the armature unit, wherein:
the first bearing unit is held at the frame,
the second bearing unit is held at the plate, and
the commutator is pressed, with the spring, toward the first bearing unit in the axis direction of the armature unit.

2. The motor according to claim 1 , wherein
the spring connects to the commutator, and
the spring presses, against the second bearing unit or the commutator in the axis direction of the armature unit.

3. The motor according to claim 1 , wherein the spring rotates with the commutator.

4. The motor according to claim 1 , wherein a first washer is arranged between the spring and the first sliding washer in the axis direction of the armature unit,
the first sliding washer is arranged between the first washer and the second bearing unit in the axis direction of the armature unit, and
the spring is arranged between the first washer and the commutator in the axis direction of the armature unit.

Assignees

• Minebea Mitsumi Inc

Inventors

• Mochizuki Hiroaki
• Kuroda Minoru

Classifications

• H02K5/1672 Primary

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1677 takes precedence) · CPC title

• H02K5/161 Primary

  radially supporting the rotary shaft at both ends of the rotor (H02K5/165, H02K5/167, H02K5/173 take precedence) · CPC title

• H02K13/006

  Structural associations of commutators · CPC title

• H02K7/083

  radially supporting the rotary shaft at both ends of the rotor (H02K7/086, H02K7/09 take precedence) · CPC title