US 12,331,821 B2
Gear and steering device
Naofumi Kawamura, Kishiwada (JP); Hiroaki Suzuki, Toyota (JP); Tetsuya Ebisu, Shijonawate (JP); Yuki Fujioka, Kashiba (JP); Tomonori Sugiura, Yamatokoriyama (JP); Kosuke Ito, Shiki-gun (JP); Yasuhiro Tanioka, Kashihara (JP); Masayoshi Sakuda, Kashihara (JP); Takahiro Baito, Kosai (JP); Takao Nakaaki, Kashihara (JP); Yoshiaki Murakami, Hamamatsu (JP); Takashi Yamaguchi, Toyohashi (JP); and Kazuhisa Asakawa, Shiki-gun (JP)
Assigned to JTEKT CORPORATION, Kariya (JP)
Appl. No. 18/569,517
Filed by JTEKT CORPORATION, Kariya (JP); and JTEKT COLUMN SYSTEMS CORPORATION, Kosai (JP)
PCT Filed Mar. 10, 2022, PCT No. PCT/JP2022/010695
§ 371(c)(1), (2) Date Dec. 12, 2023,
PCT Pub. No. WO2022/264559, PCT Pub. Date Dec. 22, 2022.
Claims priority of application No. PCT/JP2021/023087 (WO), filed on Jun. 17, 2021.
Prior Publication US 2024/0271689 A1, Aug. 15, 2024
Int. Cl. F16H 55/12 (2006.01); B62D 5/04 (2006.01); F16H 55/06 (2006.01)
CPC F16H 55/12 (2013.01) [B62D 5/0403 (2013.01); F16H 2055/065 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A gear comprising:
an annular sleeve; and
an annular tooth portion provided by injection molding to cover a part of the sleeve, wherein
the sleeve is a stacked body including a plurality of annular steel plates stacked in an axial direction of the sleeve,
the sleeve has a plurality of lightening holes passing through the sleeve in the axial direction,
the plurality of lightening holes includes a first lightening hole and a second lightening hole having different shapes when viewed in the axial direction,
the plurality of lightening holes is disposed in a circumferential direction of the sleeve to be in different states at any phase positions during one rotation of the sleeve,
each of the plurality of steel plates has a plurality of lightening through holes passing through the steel plate in the axial direction,
the plurality of lightening through holes includes a first lightening through hole and a second lightening through hole having different shapes when viewed in the axial direction,
the plurality of lightening through holes is disposed in the circumferential direction of the sleeve to be in different states at any phase positions during the one rotation of the sleeve,
the plurality of lightening through holes forms the plurality of lightening holes in a state in which the plurality of steel plates is stacked,
each of the plurality of steel plates includes a steel plate protrusion that protrudes in the axial direction and a steel plate recess having a depth in the axial direction,
each of the plurality of steel plates is structured such that the steel plate protrusion and the steel plate recess of the steel plates adjacent to each other are fitted together in the state in which the plurality of steel plates is stacked,
the steel plate protrusion and the steel plate recess are provided in portions of each of the steel plates covered with the tooth portion, and
the same numbers of the steel plate protrusions and the steel plate recesses are alternately disposed in the circumferential direction of the sleeve.