US 11,702,037 B2
Motor device
Osamu Nakamura, Gunma (JP)
Assigned to MITSUBA Corporation, Gunma (JP)
Appl. No. 16/644,166
Filed by MITSUBA Corporation, Gunma (JP)
PCT Filed Oct. 23, 2018, PCT No. PCT/JP2018/039360
§ 371(c)(1), (2) Date Mar. 4, 2020,
PCT Pub. No. WO2019/107018, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 2017-228650 (JP), filed on Nov. 29, 2017.
Prior Publication US 2021/0061230 A1, Mar. 4, 2021
Int. Cl. B60S 1/26 (2006.01); F16H 1/16 (2006.01); F16H 57/039 (2012.01); F16H 57/02 (2012.01)
CPC B60S 1/26 (2013.01) [F16H 1/16 (2013.01); F16H 57/039 (2013.01); F16H 2057/02034 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A motor device, comprising:
a motor part comprising an armature shaft;
a speed reduction mechanism which comprises a worm and a worm wheel and outputs rotation of the armature shaft at a reduced speed;
a gear case which, is provided with a bottom part and an opening part and accommodates the worm and the worm wheel in a rotatable manner;
a gear cover which covers the opening part of the gear case;
a circuit board which is arranged between the speed reduction mechanism and the gear cover; and
a board cover which is arranged between the circuit board and the speed reduction mechanism,
wherein the board cover is provided with a positioning protrusion part protruding toward the gear case, the gear case is provided with a positioning recess part into which the positioning protrusion part is press-fit, and a bottom surface of the positioning recess part and a tip end surface of the positioning protrusion part press-fit into the positioning recess part face each other with a gap between the tip end surface of the positioning protrusion part and the bottom surface of the positioning recess part as the gap prevents the positioning protrusion part from touching any of the positioning recess part,
wherein a plurality of case side abutment parts abutting against a first main surface of the board cover on which the positioning protrusion is disposed are disposed on the gear case and being a part of the gear case, a plurality of cover side abutment parts abutting against a second main surface which is on an opposite side of the first main surface of the board cover are disposed on the gear cover and being a part of the gear cover, and at least one of the cover side abutment parts is arranged at a position corresponding to the positioning protrusion part, wherein the at least one of the cover side abutment parts is aligned with at least a part of the positioning recess part with the positioning protrusion part sandwiched between the at least one of the cover side abutment parts and the positioning recess part.