Electric motor with reduction gear mechanism
AssigneeMitsuba Corporation
InventorsSatoshi Kanda, Shuichi Hatori
Life of this patent
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Abstract
In a wiper motor including a motor body and a reduction gear apparatus, an accommodating case is integrally provided on a brush holder provided to the motor body, and this accommodating case is disposed on an outer face of a gear case so as to project from a motor yoke. A noise-preventing element including a pair of choke coils and a bidirectional varistor is accommodated in the accommodating case, and the noise-preventing element is connected between a power-feeding terminal of a connector provided on the gear case and brushes. Noises acting on a power-feeding circuit are absorbed by the noise-preventing element and noises which have leaked to the outside via an opening portion of the motor yoke are absorbed by the noise-preventing element.
Claims17
An electric motor with reduction gear mechanism including a motor body provided with a rotating shaft and a reduction gear mechanism for decelerating rotation of the rotating shaft to output it from an output shaft, the electric motor comprising:
- an armature provided with a commutator fixed to the rotating shaft and a coil connected to the commutator;
- a motor yoke having a magnet mounted on its inner face and rotatably accommodating the armature;
- a brush holder mounted inside the motor yoke and holding a pair of brushes slide-contacting with the commutator;
- a gear case fixed to the motor yoke and accommodating the reduction gear mechanism;
- a connector provided with a pair of power-feeding terminals each connected to a power source, the connector being disposed on the gear case;
- an accommodating case provided integrally with the brush holder and projecting toward the gear case via an opening portion of the motor yoke to be disposed on an outer face of the gear case;
- and
- a noise-preventing means accommodated in the accommodating case and connected between the brushes and the power-feeding terminal.
An electric motor with reduction gear mechanism including a motor body provided with a rotating shaft and a reduction gear mechanism for decelerating rotation of the rotating shaft to output it from an output shaft, the electric motor comprising:
- an armature provided with a commutator fixed to the rotating shaft and a coil connected to the commutator;
- a motor yoke having a magnet mounted on its inner face and rotatably accommodating the armature;
- a brush holder mounted inside the motor yoke and holding a pair of brushes slide-contacting with the commutator;
- a motor-yoke-side grounding terminal provided on the brush holder, connected to each of the brushes on a negative-pole side, and contacting with the inner face of the motor yoke;
- a gear case formed from a conductor, fixed in a state where the gear case has been electrically connected to the motor yoke, and accommodating the reduction gear mechanism;
- a connector provided with a pair of power-feeding terminals each connected to a power source, the connector being disposed on the gear case;
- a noise-preventing means accommodated in an accommodating case disposed on an outer face of the gear case, connected to the brushes via an opening portion of the motor yoke by a pair of brush-side connecting plates, and connected to the power-feeding terminals by a pair of power-feeding-side connecting plates;
- and
- a gear-case-side grounding terminal provided on a negative-pole side of the power-feeding-side connecting plate and including a gear-case-side grounding terminal contacting with the gear case.
Dependencies are inferred from the claim text.