US 12,234,902 B2
Strain wave gearing
Kotaro Matsuzawa, Azumino (JP); Hideki Hirabayashi, Azumino (JP); Syuhei Kobayashi, Azumino (JP); and Hideki Okuhara, Azumino (JP)
Assigned to HARMONIC DRIVE SYSTEMS INC., Tokyo (JP)
Appl. No. 18/264,942
Filed by HARMONIC DRIVE SYSTEMS INC., Tokyo (JP)
PCT Filed May 26, 2021, PCT No. PCT/JP2021/020067
§ 371(c)(1), (2) Date Aug. 10, 2023,
PCT Pub. No. WO2022/249355, PCT Pub. Date Dec. 1, 2022.
Prior Publication US 2024/0052920 A1, Feb. 15, 2024
Int. Cl. F16H 49/00 (2006.01); F16C 19/36 (2006.01)
CPC F16H 49/001 (2013.01) [F16C 19/362 (2013.01); F16C 2226/62 (2013.01); F16C 2361/61 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A strain wave gearing comprising:
a rigid internally toothed gear;
a flexible externally toothed gear;
a wave generator that flexes the externally toothed gear in a non-circular shape to partially mesh with the internally toothed gear and moves an engagement position of the externally toothed gear with the internally toothed gear in a circumferential direction; and
a bearing that supports the internally toothed gear and the externally toothed gear in a relatively rotatable state,
wherein
the internally toothed gear is an inner-race integrated-type gear in which an inner race of the bearing is integrated with the internally toothed gear;
the internally toothed gear is provided with a circular outer circumferential surface formed with an inner-race-side raceway groove of the bearing, a circular inner circumferential surface formed with internal teeth, and an annular end face where bolt holes are open; and
the bolt holes are arranged in a prescribed interval along the circumferential direction and extend in a direction of an axial line, and
wherein
the internal teeth of the internally toothed gear are located offset to a side of the annular end face with respect to the inner-race-side raceway groove when viewed along the direction of the axial line;
each of the bolt holes is provided with a bolt passage hole part opening on the annular end face and a screw hole part that continues from the bolt passage hole and extends in the direction of the axis line; and
the entire screw hole part of each of the bolt holes is located offset to an opposite side of the annular end face with respect to the internal teeth when viewed in the direction of the axial line, so that the screw hole part has no overlapped section with the internal teeth in a radial direction.