Electric motor with reduced axial footprint
View Patent ↗A motor includes a motor unit, a deceleration unit, and a connector unit. The motor unit outputs rotational drive force and includes a yoke housing, a commutator, a power supply brush, a conductive member, and a brush holder. The yoke housing has an open end in an axial direction. The conductive member is electrically connected to the power supply brush. The brush holder is arranged in the open end to hold the commutator, the power supply brush, and the conductive member. The deceleration unit includes a gear housing coupled to the open end. The connector unit is coupled to the gear housing and including a connection terminal electrically connected to the conductive member. The commutator and the power supply brush are arranged outside the yoke housing. The conductive member and the yoke housing are arranged on opposite sides of the commutator.
1. A motor comprising:
a motor unit that outputs rotational drive force, wherein the motor unit includes
a yoke housing having an open end in an axial direction,
a commutator,
a power supply brush that supplies power to the commutator,
a conductive member electrically connected to the power supply brush, and
a brush holder arranged in the open end to hold the commutator, the power supply brush, and the conductive member; and
a deceleration unit including,
a gear housing coupled to the open end, and
a deceleration mechanism arranged in the gear housing to decelerate and output the rotational drive force of the motor unit, wherein
the commutator and the power supply brush are arranged outside the yoke housing,
the conductive member and the yoke housing are arranged on opposite sides of the commutator,
the brush holder includes a cover having an outer circumferential wall portion, which substantially covers an outer periphery of the commutator and a circular wall portion, which substantially covers an axial end face of the commutator,
the power supply brush extends from outside the outer circumferential wall portion of the cover toward inside the outer circumferential wall so that a distal end of the power supply brush positions at the inside of the outer circumferential wall portion,
the circular wall portion has a holder that holds the conductive member, and
the conductive member is arranged so that at least part of the conductive member overlaps the commutator in the axial direction.
2. The motor according to claim 1 , wherein the holder being configured so that the conductive member is coupled from an opposite side of the yoke housing to the holder in the axial direction.
3. The motor according to claim 2 , wherein the holder is arranged so that at least part of the holder overlaps the commutator in the axial direction.
4. The motor according to claim 1 , wherein
the commutator includes a first end face facing the yoke housing and an opposite second end face, and
the cover covers the second end face of the commutator.
5. The motor according to claim 1 , further comprising a connector unit coupled to the gear housing and including a connection terminal electrically connected to the conductive member, wherein
the conductive member includes a terminal portion having an elastic bifurcated section, and
the connection terminal is inserted into the bifurcated section of the terminal portion and elastically sandwiched by the bifurcated section.
6. The motor according to claim 5 , wherein
the bifurcated section includes a basal end divided into two, and
the holder holds the bifurcated section at a part closer to a distal end than the basal end.
7. The motor according to claim 1 , further comprising a connector unit coupled to the gear housing and including a connection terminal electrically connected to the conductive member, wherein
the connector unit is coupled to the gear housing along a predetermined coupling direction, and
the conductive member includes a hook contactable with the brush holder in the coupling direction.
8. The motor according to claim 1 , wherein the conductive member is planar and includes a planar surface parallel to an axis of the motor unit.
9. The motor according to claim 1 , further comprising a connector unit coupled to the gear housing and including a connection terminal electrically connected to the conductive member, wherein
the brush holder holds an electric component, which is electrically connected to the conductive member, and is arranged so that the brush holder and the yoke housing are located on opposite sides of the commutator; and
the conductive member is substantially U-shaped and includes a first terminal portion and a second terminal portion, which extend in a direction orthogonal to an axis of the motor unit and face the same direction with respect to each other, and an intermediate portion, which connects the terminal portions, wherein the connection terminal of the connector unit is connected to the first terminal portion, and a conductive wire extends from the power supply brush to the second terminal portion.
10. The motor according to claim 9 , wherein the first and second terminal portions of the conductive member are arranged parallel to the direction orthogonal to the axial direction of the motor unit.
11. The motor according to claim 1 , further comprising a connector unit coupled to the gear housing and including a connection terminal electrically connected to the conductive member.
12. The motor according to claim 1 , wherein the conductive member extends along a line that is orthogonal to an axis of a rotation shaft and lies along a planar direction of the motor.
13. The motor according to claim 1 , wherein if the axis of the rotation shaft formed an imaginary line dividing two planes, the conductive member extend across the plane divided by the imaginary line.
14. A motor comprising:
a motor unit that outputs rotational drive force, wherein the motor unit includes
a yoke housing having an open end in an axial direction,
a commutator,
a power supply brush that supplies power to the commutator,
a conductive member electrically connected to the power supply brush, and
a brush holder arranged in the open end to hold the commutator, the power supply brush, and the conductive member; and
a deceleration unit including,
a gear housing coupled to the open end, and
a deceleration mechanism arranged in the gear housing to decelerate and output the rotational drive force of the motor unit, wherein
the commutator and the power supply brush are arranged outside the yoke housing,
the conductive member and the yoke housing are arranged on opposite sides of the commutator,
the brush holder includes a cover having an outer circumferential wall portion, which substantially covers an outer periphery of the commutator and a circular wall portion, which substantially covers an axial end face of the commutator,
the power supply brush extends from outside the outer circumferential wall portion of the cover toward inside the outer circumferential wall so that a distal end of the power supply brush positions at the inside of the outer circumferential wall portion,
the circular wall portion has a holder that holds the conductive member,
the holder is configured so that the conductive member is coupled from an opposite side of the yoke housing to the holder in the axial direction, and
the holder is arranged so that at least part of the holder overlaps the commutator in the axial direction.
15. A motor comprising:
a motor unit that outputs rotational drive force, wherein the motor unit includes
a yoke housing having an open end in an axial direction,
a commutator,
a power supply brush that supplies power to the commutator,
a conductive member electrically connected to the power supply brush, and
a brush holder arranged in the open end to hold the commutator, the power supply brush, and the conductive member;
a deceleration unit including,
a gear housing coupled to the open end, and
a deceleration mechanism arranged in the gear housing to decelerate and output the rotational drive force of the motor unit; and
a connector unit coupled to the gear housing and including a connection terminal electrically connected to the conductive member, wherein
the commutator and the power supply brush are arranged outside the yoke housing,
the conductive member and the yoke housing are arranged on opposite sides of the commutator,
the brush holder includes a cover having an outer circumferential wall portion, which substantially covers an outer periphery of the commutator and a circular wall portion, which substantially covers an axial end face of the commutator,
the power supply brush extends from outside the outer circumferential wall portion of the cover toward inside the outer circumferential wall so that a distal end of the power supply brush positions at the inside of the outer circumferential wall portion,
the circular wall portion has a holder that holds the conductive member,
the connector unit is coupled to the gear housing along a predetermined coupling direction, and
the conductive member includes a hook contactable with the brush holder in the coupling direction.
16. A motor comprising:
a motor unit that outputs rotational drive force, wherein the motor unit includes
a yoke housing having an open end in an axial direction,
a commutator,
a power supply brush that supplies power to the commutator,
a conductive member electrically connected to the power supply brush, and
a brush holder arranged in the open end to hold the commutator, the power supply brush, and the conductive member;
a deceleration unit including,
a gear housing coupled to the open end, and
a deceleration mechanism arranged in the gear housing to decelerate and output the rotational drive force of the motor unit; and
a connector unit coupled to the gear housing and including a connection terminal electrically connected to the conductive member, wherein
the commutator and the power supply brush are arranged outside the yoke housing,
the conductive member and the yoke housing are arranged on opposite sides of the commutator,
the brush holder includes a cover having an outer circumferential wall portion, which substantially covers an outer periphery of the commutator and a circular wall portion, which substantially covers an axial end face of the commutator,
the power supply brush extends from outside the outer circumferential wall portion of the cover toward inside the outer circumferential wall so that a distal end of the power supply brush positions at the inside of the outer circumferential wall portion,
the circular wall portion has a holder that holds the conductive member,
the brush holder holds an electric component, which is electrically connected to the conductive member, and is arranged so that the brush holder and the yoke housing are located on opposite sides of the commutator; and
the conductive member is substantially U-shaped and includes a first terminal portion and a second terminal portion, which extend in a direction orthogonal to an axis of the motor unit and face the same direction with respect to each other, and an intermediate portion, which connects the terminal portions, wherein the connection terminal of the connector unit is connected to the first terminal portion, and a conductive wire extends from the power supply brush to the second terminal portion.