US 12,270,457 B2
Speed reducer
Mitsuhiro Okada, Kitasaku-gun (JP); and Takayuki Nakamura, Kitasaku-gun (JP)
Assigned to MINEBEA MITSUMI Inc., Nagano (JP)
Appl. No. 18/292,624
Filed by MINEBEA MITSUMI Inc., Nagano (JP)
PCT Filed Jul. 27, 2022, PCT No. PCT/JP2022/028892
§ 371(c)(1), (2) Date Jan. 26, 2024,
PCT Pub. No. WO2023/008466, PCT Pub. Date Feb. 2, 2023.
Claims priority of application No. 2021-125778 (JP), filed on Jul. 30, 2021; and application No. 2021-125779 (JP), filed on Jul. 30, 2021.
Prior Publication US 2024/0288050 A1, Aug. 29, 2024
Int. Cl. F16H 1/28 (2006.01); F16H 57/08 (2006.01)
CPC F16H 1/28 (2013.01) [F16H 57/082 (2013.01); F16H 2001/2881 (2013.01); F16H 2057/085 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A speed reducer comprising:
a sun gear;
an internal gear;
a first planetary gear meshing with the sun gear and the internal gear;
two bearings disposed to sandwich the first planetary gear in an axial direction;
a coupling part fixed to a motor, and
a joining member bonding the motor and the coupling part;
wherein at least one of the two bearings is pressed against the internal gear in an axial direction by an engaging member;
a main body part on which the internal gear is formed supports at least one of the two bearings in a radial direction;
the two bearings have a same size in a radial direction;
the coupling part supports at least one of the bearings, which is supported by the main body part, in a radial direction;
a length of the joining member in an axial direction is larger than an interval between the coupling part and the main body part in an axial direction;
the coupling part includes a hole part enabling the joining member to be inserted;
the main body part includes a hole part formed at a position facing the hole part in an axial direction, and
an inner diameter of the hole part formed in the main body part is smaller than an inner diameter of the hole part formed in the coupling part.