DC MOTOR

摘要

A first brush holder is assembled to a core-side connection plate by inserting a slit insertion portion into a slit from an outer circumferential side of the core-side connection plate, and a radial outside position of the first brush holder to the core-side connection plate is regulated by both sides in a circumferential direction of a first slit being inserted into a pair of guiding grooves. A radial outside position of the brush holder is regulated by being fixed to a counter-core-side connection plate by press-fitting a convex portion provided on a counter-core-side of the first brush holder into a second slit of a counter-core-side connection plate. A second brush holder is assembled to the counter-core-side connection plate from an outer circumferential side of the counter-core-side connection plate, and a radial outside position is regulated by the core-side connection plate.

主权项

1. A DC motor having four or more poles comprising:
a cylindrical commutator composed on an axis of an armature; brushes composed of positive brushes and negative brushes disposed on an outer periphery of the commutator; brush holders that hold the brushes; brush pressing members accommodated in the brush holders that press the brushes toward the commutator; an electrically conductive first connection plate to which all the positive brushes or all the negative brushes are electrically connected individually via pigtails; and an electrically conductive second connection plate to which all the negative brushes or all the positive brushes are electrically connected individually via the pigtails; wherein, the brush holder of which an inner circumferential side in a radial direction facing the commutator is opened and the brush holder includes a wall on an outer circumferential side in the radial direction thereof that regulates an outside position in the radial direction of the brush pressing member, an armature core side in an axial direction of the brush holder, which is referred to as a core side, is assembled to the first connection plate, and a counter-armature core side in the axial direction of the brush holder, which is referred to as a counter-core-side, is assembled to the second connection plate; when referring to the brush holder that holds the brush connected to the first connection plate via a pigtail as a first brush holder, and the brush holder that holds the brush connected to the second connection, plate via the pigtail as a second brush holder; a slit that opens outside in the radial direction and extends halfway to inside is formed in the first connection plate at a circumferential position where the first brush holder is disposed; and the first brush holder has a slit insertion portion on the core side in the axial direction, the first brush holder is assembled to the first connection plate by inserting the slit insertion portion into the slit from an outer circumferential side of the first connection plate, and an outside position in the radial direction of the first brush holder with respect to the first connection plate is regulated by a single first regulating member.