US 11,725,719 B2
Gear wheel mechanism and manufacturing method for a gear wheel mechanism
Yuichi Aki, Tokyo (JP); and Fujio Kobayashi, Tokyo (JP)
Assigned to SONY CORPORATION, Tokyo (JP)
Appl. No. 17/250,550
Filed by SONY CORPORATION, Tokyo (JP)
PCT Filed Aug. 1, 2019, PCT No. PCT/JP2019/030220
§ 371(c)(1), (2) Date Feb. 2, 2021,
PCT Pub. No. WO2020/031843, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 2018-151277 (JP), filed on Aug. 10, 2018.
Prior Publication US 2021/0293317 A1, Sep. 23, 2021
Int. Cl. F16H 49/00 (2006.01); B29C 45/14 (2006.01); F16H 55/06 (2006.01); F16H 55/17 (2006.01); B29L 15/00 (2006.01)
CPC F16H 49/001 (2013.01) [B29C 45/14 (2013.01); F16H 55/06 (2013.01); F16H 55/17 (2013.01); B29L 2015/003 (2013.01); F16H 2049/003 (2013.01); F16H 2055/065 (2013.01); F16H 2055/176 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A gear wheel mechanism, comprising:
a rotation shaft;
a rotator that is configured to be rotatable about the rotation shaft, wherein the rotator has an elliptical shape as viewed in an axis direction of the rotation shaft;
a first gear wheel including:
a first base portion that includes a first outer circumferential surface and a first inner circumferential surface, wherein
the first gear wheel has a hollow cylindrical shape,
the first gear wheel is configured to be deformable by the rotator based on insertion of the rotator in the axis direction of the rotation shaft; and
a plurality of external teeth on the first outer circumferential surface;
a second gear wheel including:
a second base portion that includes:
a second outer circumferential surface and a second inner circumferential surface, wherein
the second gear wheel has the hollow cylindrical shape, and
the second gear wheel covers the external teeth;
a side wall portion having an annular shape as viewed in the axis direction of the rotation shaft; and
a lid portion that covers the side wall portion; and
a plurality of internal teeth at a plurality of positions that faces the plurality of external teeth of the second inner circumferential surface, wherein
the plurality of internal teeth are partially engaged with the plurality of external teeth based on deformation of the first base portion by rotation of the rotator; and
a reinforcement member that is in contact with a region of the second outer circumferential surface corresponding to a region that includes the plurality of internal teeth of the second inner circumferential surface, wherein
the plurality of internal teeth are on a third inner circumferential surface of the side wall portion,
the reinforcement member is in contact with a third outer circumferential surface of the side wall portion,
the third outer circumferential surface of the side wall portion is configured to be oblique so as to be closer to the rotation shaft based on approach of the third outer circumferential surface towards the lid portion, and
the reinforcement member includes a tapered surface that is in contact with the third outer circumferential surface.