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US 2003/0117036 A1Published application
Brush holding device, motor having the same, and method for assembling motor
AssigneeAsmo Co., Ltd.
InventorsYasuaki Uchida, Masashi Nakata
Life of this patent
Estimating the term…
Abstract
Brush holding device includes a brush, a brush holder, a torsion spring and a support pin. The torsion spring applies side pressure to the brush by spring force exerted around the support pin and also temporarily hold the brush in the brush holder. When the temporarily held state of the brush holder is relieved, the spring force of the torsion spring urges the brush toward a commutator.
Claims20
A method for assembling a motor, the method comprising:
- temporarily holding a brush in a first position where the brush is retracted away from an installation path of an armature into a brush holder and is urged against a side wall of the brush holder by an urging means in a direction perpendicular to a sliding direction of the brush, which substantially coincides with a radial direction of a commutator of the armature, so that the brush is temporarily held in the first position by a static frictional force generated between the side wall of the brush holder and the brush, wherein the static frictional force is greater than an urging force of the urging means applied to the brush in the sliding direction;
- installing the armature, which includes the commutator, in a predetermined position within a housing of the motor along the installation pass of the armature while the brush is temporarily held in the first position;
- and
- releasing the brush held in the first position by applying an external force to the brush in the sliding direction to overcome the static frictional force, so that the brush is slid to a second position, in which the brush is urged against the commutator in the sliding direction, by an urging force of the urging means that is greater than a frictional force between the side wall of the brush holder and the brush.
1 more element
A brush holding device for a motor that includes an armature having a commutator, the brush holding device comprising:
- a brush;
- a brush holder that includes a side wall, wherein the brush holder slidably receives the brush such that the brush is slidable in a sliding direction, which substantially coincides with a radial direction of the commutator of the motor;
- and
- an urging means for urging the brush and also for selectively positioning the brush between:
- a first position where the brush is retracted away from the commutator into the brush holder and is urged against the side wall of the brush holder by the urging means in a direction perpendicular to the sliding direction, so that the brush is temporarily held in the first position by a static frictional force generated between the side wall of the brush holder and the brush, wherein the static frictional force is greater than an urging force of the urging means applied to the brush in the sliding direction;
- and
- a second position where the brush is urged against the commutator by the urging means in the sliding direction.
4 more elements
A motor comprising:
- a motor assembly that includes:
- a motor housing that has an open end;
- an armature that is at least partially received in the motor housing and includes a commutator;
- and
- a rotatable shaft that extends along the axis of the armature and is rotated integrally with the armature;
- and
- a speed reducing gear assembly that includes:
- a gear housing that-has an open end;
- a worm that is received in the gear housing and is integrally formed with the rotatable shaft;
- and
- at least one brush holding device arranged around the commutator, wherein each brush holding device includes:
- a brush;
- a brush holder that is spaced apart from the open end of the gear housing to be completely received within the gear housing and includes a side wall, wherein the brush holder slidably receives the brush such that the brush is slidable in a sliding direction, which substantially coincides with a radial direction of the commutator of the motor;
- and
- an urging means for urging the brush and also for selectively positioning the brush between:
- a first position where the brush is retracted away from the commutator into the brush holder and is urged against the side wall of the brush holder by the urging means in a direction perpendicular to the sliding direction, so that the brush is temporarily held in the first position by a static frictional force generated between the side wall of the brush holder and the brush, wherein the static frictional force is greater than an urging force of the urging means applied to the brush in the sliding direction;
- and
- a second position where the brush is urged against the commutator by the urging means in the sliding direction.
15 more elements
Dependencies are inferred from the claim text.