US 12,176,790 B2
Brushless motor
Teppei Tokizaki, Gunma (JP); Motoaki Kobayashi, Gunma (JP); Satoshi Tamura, Gunma (JP); Masaki Hayata, Gunma (JP); Masakazu Saito, Gunma (JP); and Yoshichika Kawashima, Gunma (JP)
Assigned to MITSUBA Corporation, Gunma (JP)
Filed by MITSUBA Corporation, Gunma (JP)
Filed on Jun. 13, 2023, as Appl. No. 18/334,359.
Claims priority of application No. 2022-137583 (JP), filed on Aug. 31, 2022.
Prior Publication US 2024/0072605 A1, Feb. 29, 2024
Int. Cl. H02K 7/116 (2006.01); F16H 1/08 (2006.01); B60S 1/08 (2006.01); B60S 1/26 (2006.01); F16H 57/02 (2012.01)
CPC H02K 7/116 (2013.01) [F16H 1/08 (2013.01); B60S 1/08 (2013.01); B60S 1/26 (2013.01); F16H 2057/02034 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A brushless motor comprising:
a motor part; and
a gear part, wherein
the motor part comprises:
a rotating shaft, having a first gear provided on a tip side thereof;
a rotor, having a bottom wall and a side wall, the bottom wall being fixed to a base end side of the rotating shaft;
a plurality of magnets, fixed to the side wall and arranged side by side in a circumferential direction of the rotor;
a stator, provided between the rotating shaft and the plurality of magnets in a radial direction of the rotor and wound with a coil; and
a motor housing, rotatably supporting the rotating shaft, and accommodating the rotor and the stator;
the gear part comprises:
a second gear, meshed with the first gear;
an output shaft, having an output part provided on a tip side thereof, having a base end side thereof fixed to the second gear, and parallel to the rotating shaft; and
a gear housing, rotatably supporting the output shaft, and accommodating the second gear,
a bearing, rotatably supporting the rotating shaft at a location more toward the tip side of the rotating shaft than the first gear, the bearing is accommodated inside the gear housing,
wherein the first gear is a pinion gear having one spiral tooth; and the second gear is a helical gear having an oblique tooth with which the one spiral tooth is meshed,
wherein a backup member is disposed adjacent to the first gear, and the backup member is arranged to partially surround the first gear,
wherein the backup member is separate from the gear housing,
wherein in an axial direction of the rotating shaft, at least a part of the bearing and a part of the backup member overlap.