MOTOR

• US 20120194020A1
• Filed: 01/19/2012
• Published: 08/02/2012
• Est. Priority Date: 01/31/2011
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: ASMO Company Limited (DENSO Corporation)
• Inventors: MIZUTANI, Nobuo
• Granted Patent: US 8,901,792 B2
• Time in Patent Office: Days
• US Class Current: 310/83
• CPC Class Codes: H02K 5/148 Slidably supported brushes

Abstract

A brush holder is provided in a metal yoke. The brush holder holds feeder brushes for supplying power to a commutator. The commutator and the feeder brushes are arranged outside the yoke housing as seen in a direction orthogonal to the axis of the yoke. As seen in the axial direction, proximal ends of the feeder brushes are arranged outside the inner circumferential surface of the yoke.

Claims

1. A motor comprising:

a motor portion; and

a speed reducing portion,

wherein the motor portion includes a brush holder, which holds a feeder brush for supplying power to a commutator fixed to a rotary shaft, the brush holder being provided at an open end of a metal yoke housing, through which open end rotation of the motor portion is outputted,

wherein a gear housing is assembled to the open end of the yoke housing,

wherein the speed reducing portion has a speed reducing mechanism located in the gear housing, the speed reducing mechanism reducing the speed of the rotation from the motor portion and outputting the rotation,

wherein as seen in a direction orthogonal to an axis of the yoke housing, the commutator and the feeder brush are arranged outside the yoke housing, and

wherein as seen in the axial direction, an outer end of the feeder brush is arranged outside an inner circumferential surface of the yoke housing.

2. The motor according to claim 1,

wherein the brush holder has a brush accommodating portion, which accommodates the feeder brush such that the feeder brush is movable, and

wherein as seen in the axial direction, an outer end of the brush accommodating portion is arranged outside the inner circumferential surface of the yoke housing.

3. The motor according to claim 2,

wherein the brush holder has a brush box including the brush accommodating portion, and

wherein as seen in the axial direction, an outer end of the brush box is arranged outside the inner circumferential surface of the yoke housing.

4. The motor according to claim 1,

wherein a support pillar portion, which projects toward the gear housing, and an urging member supported by the support pillar portion are provided in the brush holder, the urging member pressing the feeder brush against the commutator, and

wherein as seen in the axial direction, at least a part of the support pillar portion is arranged outside the inner circumferential surface of the yoke housing.

5. The motor according to claim 4,

wherein the feeder brush is one of a pair of feeder brushes,

wherein as seen in the axial direction, the feeder brushes are arranged symmetrically with respect to a straight line orthogonal to an axis of the motor portion, and

wherein the support pillar portion is arranged between the feeder brushes in the circumferential direction of the feeder brushes.

6. A motor comprising:

a motor portion; and

a speed reducing portion,

wherein the motor portion includes a brush holder, which holds a feeder brush for supplying power to a commutator fixed to a rotary shaft, the brush holder being provided at an open end of a metal yoke housing, through which open end rotation of the motor portion is outputted,

wherein a gear housing is assembled to the open end of the yoke housing,

wherein the speed reducing portion has a speed reducing mechanism located in the gear housing, the speed reducing mechanism reducing the speed of the rotation from the motor portion and outputting the rotation,

wherein the brush holder has a brush accommodating portion, which accommodates the feeder brush such that the feeder brush is movable,

wherein as seen in a direction orthogonal to an axis of the yoke housing, the commutator, the brush accommodating portion, and the feeder brush are arranged outside the yoke housing, and

wherein as seen in the axial direction, an outer end of the brush accommodating portion is arranged outside an inner circumferential surface of the yoke housing.

7. A motor comprising:

a motor portion; and

a speed reducing portion,

wherein the motor portion includes a brush holder, which holds a feeder brush for supplying power to a commutator fixed to a rotary shaft, the brush holder being provided at an open end of a metal yoke housing, through which open end rotation of the motor portion is outputted,

wherein a gear housing is assembled to the open end of the yoke housing,

wherein the speed reducing portion has a speed reducing mechanism located in the gear housing, the speed reducing mechanism reducing the speed of the rotation from the motor portion and outputting the rotation,

wherein the brush holder has a brush box, in which a brush accommodating portion is formed, the brush accommodating portion accommodates the feeder brush such that the feeder brush is movable,

wherein as seen in a direction orthogonal to an axis of the yoke housing, the commutator, the brush box, and the feeder brush are arranged outside the yoke housing, and

wherein as seen in the axial direction, an outer end of the brush box is arranged outside an inner circumferential surface of the yoke housing.