DC brush motor
View Patent ↗There is provided a DC brush motor that is provided with: a magnet; an armature configured to rotate relative to the magnet about a rotary axis, the armature comprising a commutator; a bracket configured to cover one end portion of the magnet and the armature at one side along the rotary axis; a female terminal that is fixed to the bracket; a brush that is electrically connected to the female terminal, and a sealing member that is fixed to the bracket. The bracket is provided with a recessed portion formed on an outer periphery thereof and configured to accommodate therein the female terminal. The sealing member is configured to seal between the recessed portion and a space where the commutator and the brush exist.
1. A DC brush motor comprising:
a magnet;
an armature configured to rotate relative to the magnet about a rotary axis, the armature comprising a commutator;
a bracket configured to cover one end portion of the magnet and the armature at one side along the rotary axis;
a female terminal that is fixed to the bracket;
a brush that is electrically connected to the female terminal, and
a sealing member that is fixed to the bracket,
wherein the bracket comprises a recessed portion formed on an outer periphery thereof,
wherein the recessed portion extends through the outer periphery to communicate with an exterior of the bracket,
wherein the recessed portion is configured to accommodate therein the female terminal, wherein the sealing member seals off an internal space of the bracket from communication with the exterior of the bracket via the recessed portion, and
wherein the commutator and the brush are located in the internal space.
2. The DC brush motor according to claim 1 ,
wherein the recessed portion is opened at the other side along the rotary axis, and
wherein the sealing member is configured to seal the other side of the recessed portion.
3. The DC brush motor according to claim 1 ,
wherein the sealing member is made of a plate-shaped resin.
4. The DC brush motor according to claim 1 ,
wherein the sealing member is configured to have substantially the same thermal coefficient of expansion as that of the bracket.
5. The DC brush motor according to claim 1 ,
wherein the sealing member is configured by a printed wiring board.
6. The DC brush motor according to claim 1 further comprising:
a gas absorbent agent that is arranged inside the bracket.
7. The DC brush motor according to claim 6 ,
wherein the bracket further comprises a communication hole configured to connect an inside and an outside of the bracket, and
wherein the gas absorbent agent is arranged at a position to block the communication hole.
8. The DC brush motor according to claim 1 further comprising a case configured to cover the one end portion of the magnet and the armature at the one side and an outer periphery-side of the magnet and the armature,
wherein an internal space configured by the bracket, the case and the sealing member is sealed.