Mitsuba Corporation

Shunji Kumagai

Naoki Kojima

Yoshichika Kawashima

Teppei Tokizaki

Motoaki Kobayashi

Junichi Saito

A speed reduction mechanism and a motor equipped with the speed reduction mechanism are provided. A pinion gear is provided with one spiral engagement projected part, and a helical gear is provided with a plurality of engagement recessed parts with which the engagement projected part is engaged. The engagement projected part and the engagement recessed part are formed so that their cross-sectional shapes along a direction orthogonal to an axial direction of the pinion gear are in arc shapes. A shape of helical teeth and a shape of the engagement recessed part are determined based on a shape of the engagement projected part provided on a spiral tooth.

Speed reduction mechanism and speed reduction mechanism-equipped motor

In an electric motor having high-speed and low-speed brushes, durability is improved and vibration/noise is reduced. The electric motor has a low-speed brush, a high-speed brush, and a common brush. Formed in the electric motor are a first coilAwhich is wound between given slots, and a second coilAwhich is wound in a direction opposite to a direction of the first coilAbetween slotsexisting at positions point-symmetric to the given slotswith respect to a center of a rotation shaft. An armature coilis formed by the first and second coilsAandA. If the armature coilis short-circuited by the high-speed brush, the first coilAand the second coilAof the short-circuited armature coilexist at positions symmetric to each other with respect to an axis line extending through the center of the high-speed brushand the center of the rotation shaft.

Electric motor

The carbon commutator of the present invention comprises a plurality of segments having ends which are sliding members on a brush and the other ends to which conductive terminal members are attached, wherein the segments are arranged in a circumferential direction on an insulating boss member and are insulated from each other, carbon layers being formed on the sliding member sides of the segments, metal layers being formed between the carbon layers and the conductive terminal members by sintering a first material of a principal component of the conductive terminal member with a second material which can alloy with the first material.

Growing community of inventors

Kiryu, Japan

Shunji Kumagai